E0_MO-1000 SM.indb
2-Needle, 2/3/4-Thread Overlock Sewing Machine
MO-1000 Series
SERVICE Manual
No.00
40138732
CONTENTS
1 SPECIFICATIONS............................................................................. 1
2 NAME OF EACH COMPONENT...................................................... 2
1. Appearance................................................................................................................ 2
2. Inside of the cover..................................................................................................... 3
3 STANDARD ADJUSTMENT / DISASSEMBLY AND ASSEMBLY... 4
1. Removing order of covers........................................................................................ 4
2. Installation of the throat plate.................................................................................. 8
3. Height of the needle bar.......................................................................................... 10
4. Position of the feed dog.......................................................................................... 12
5. Adjusting the stroke of the sub feed dog.............................................................. 14
6. Height of the feed dog............................................................................................. 16
7. Feed dog timing....................................................................................................... 18
8. Position of the balance weights and the cams..................................................... 20
9. Projecting amount of the upper looper................................................................. 22
10. Radius of the lower looper..................................................................................... 24
11. Adjustment of the loop lift...................................................................................... 26
12. Timing between upper and lower looper............................................................... 28
13. Installation of the needle guards........................................................................... 30
14. Adjusting the looper thread take-up...................................................................... 32
15. Height and lateral position of the presser foot..................................................... 34
16. Adjusting the floating of the disk of the thread tension controller.................... 36
17. Adjusting the tension of the thread tension controller........................................ 38
18. Position of the needle thread take-up thread guide............................................. 40
19. Tension of the belt................................................................................................... 42
20. Adjusting the needle bar connection guide of the needle threader................... 44
21. Adjusting the needle threader hook...................................................................... 46
22. Adjusting the looper threader timing.................................................................... 48
23. Adjusting the pump unit......................................................................................... 50
24. Position of the lower knife...................................................................................... 52
25. Engagement of the upper knife with the lower knife........................................... 54
26. Adjusting the timing of the upper knife................................................................. 56
27. Adjusting the thread sliding segment................................................................... 58
28. Adjusting the safety switch.................................................................................... 60
29. Position of the cloth plate....................................................................................... 62
4 CIRCUIT DIAGRAM........................................................................ 64
5 MAINTENANCE.............................................................................. 66
1. Lubrication............................................................................................................... 66
2. Grease application.................................................................................................. 66
3. Looper threader....................................................................................................... 66
6 TROUBLES AND CORRECTIVE MEASURES.............................. 67
WARNING :
To avoid the risk of fire, electric shock, injury to persons or damage to components,
especially keep the following:
• When disassembling, assembling or adjusting the sewing machine, remove the power plug.
• When assembling, be careful about the electrical cord being caught with other components,
damage to the covered parts of the cord or miswiring.
• When replacing the part(s), use the genuine part(s).
1 SPECIFICATIONS
No.
Items
Description
1
Model name
2-Needle, 2/3/4-Thread Overlock Sewing Machine (with differential feed
adjusting)
2
Stitch choice
2 needles, 4 thread overlock
2 needles, 3 thread overlock
1 needle, 3 thread overlock
1 needle, 2 thread overlock
3
Sewing speed
Up to 1,500 sti/min
4
Needle gauge
Overlocking: 2.2 mm
5
Overedge width
2 needles, 4 thread: 5.0 to 9.0 mm
1 needle, 3 thread (right hand needle): 3.0 to 7.0 mm
1 needle, 3 thread (left hand needle): 5.0 to 9.0 mm
Roll hemming: 2.0 mm
Knife width
2.5 to 6.5 mm
6
Thread sliding segment (*1)
M/ML
It is in synchronism with the lower knife from scale marks "2.5" to "5" of
the knife adjusting knob.
The amount of travel of the thread sliding segment can be finely adjusted with the MTC knob.
7
Stitch length
1.0 to 4.0 mm (Standard 2.5 mm)
8
Differential feed
1:0.7 to 2
9
Needle bar stroke
29.4 mm
Rating 1,350±150 sti/min
10 Presser foot height
4.8 mm to 5.0 mm
11 Feed dog height
1.3 mm (This side end of the sub feed dog P = 2.5 mm; differential feed
ratio: 1:1)
12 Needle system (Japan)
ORGAN needle HA×1 # 11 (Standard) to # 14
Needle system (Overseas)
SCHMETZ (130/705H 15X1H) # 80
13 Number of needles
Max. 2
14 Number of threads to be used
Max. 4
15 Needle threader
Operated by the manual lever
16 Looper threader
Automatic threading by the air pump
17 Air pump
Piston pump driven by the motor
Motor: DC 12V
18 Liquid crystal display (*2)
ML
Display section: 63.0 mm (W) × 17.5 mm (H)
19 Power switch
Rocker switch
20 Light
LED 5V x 2
21 Motor
100V : 100 to 120W
110/120V : 100 to 120W
220 to 240V : 100 to 130W
22 Foot control
No-heat method (semi-conductor control type)
23 Driving system
Timing belt drive
24 Machine size
330 mm (W) × 280 mm (D) × 310 mm (H)
25 Machine weight
9 kg
* 1: Only for ML type
* 2: Only for M/ML types
–1–
2 NAME OF EACH COMPONENT
1. Appearance
Open thread guide
Thread guide support
Retractable support rod
Lower looper thread tension dial
Upper looper thread tension dial
Right needle thread tension dial
Left needle thread tension dial
Top cover
Spool holder pin
Anti - vibration cone
Foam pad
Presser foot pressure
regulating knob
Thread take-up cover
ML
Thread stand
LCD screen *1
Stitch length adjustment dial
Cloth plate
Differential feed adjustment dial
Front cover
Handwheel
Machine socket
Main Power/Light switch
Looper cover with built in
knife guard
Looper cover opening indent
Thread cutter
Automatic needle threader
Needle clamp
Presser foot lifter
Upper knife
Presser foot
Stitch plate
■ View with looper cover open
Caution:
Be sure to turn off the power switch
before opening the looper cover.
Upper looper
Lower looper
Threading hole
Lower knife
Upper knife fixing screw
Cutting width adjusting dial
Selection lever for overlocking
or roll hemming
Air-control pushbutton
Threading changeover
lever
Upper knife changeover knob
M/ML Overlocking width
adjusting knob *2
* 1: Only for ML type
* 2: Only for M/ML types
–2–
2. Inside of the cover
Front face
Safety switch
Needle threading mechanism
Looper threading
mechanism
Safety switch
Knife
Rear face
ML
Power PCB
Microprocessor PCB *1
Motor
Air pump motor
–3–
3 STANDARD ADJUSTMENT / DISASSEMBLY AND ASSEMBLY
1. Removing order of covers
1-1. The top cover
Hole
○ Pushing the arrowed section in the figure by both
hands (i.e., removing the projections of the front
cover from the holes in the top cover), draw this
side upward.
○ If it is not easy to detach the rear projection from
the corresponding hole, detach it with a screwdriver or the like.
In the case the rear projection cannot be easily
removed since its left side comes in contact with
the presser spring regulating knob, detach the
presser spring regulator knob first. Then, the rear
projection will be detached smoothly.
Presser foot pressure
regulating knob
Projection
Draw upward
Screwdriver or
the like
Push
Push
1
1-2. The looper cover
○ Loosen and remove the setscrews 1.
–4–
1-3. The base plate
If the sewing machine is tilted away from you, the sewing machine
will not be stabilized since the rear cover has a rounded surface.
It is recommended to place the sewing machine with the cloth plate
down on the table.
○ Loosen and remove the setscrews 1.
○ The projections of the base plate are fitted in the holes in the
front and rear covers. Push up the base plate to remove the
projections from the holes.
Push the
base plate
1
1-4. The rear cover
○ Raise the presser bar lifting lever.
○ Loosen and remove the setscrews 1.
○ Remove the rear cover.
Caution: If you remove the rear cover forcibly
by moving it to the right and left, the
claws between the rear cover and the
front cover can break.
1
–5–
Raise the presser
bar lifting lever.
1-5. The front cover
○ Turn the pulley to retract the looper to the position indicated in the figure A .
Caution:Be sure to retract the looper without exceptions. Be aware that the 2/3 thread changeover
lever can break if the looper is not retracted.
○ Remove two connectors 1 (CN3 and CN4) of LED lamp from the power PCB. Cut the cable clip band.
○ Loosen and remove the setscrews 2.
○ Remove looper threading lever screw 3 to remove the lever.
○ Remove the setscrews 4 and 5.
○ While keeping needle threader shaft 6 held pressed, remove
it from the left side of the cover.
○ Remove the looper threading section.
5
【ML type】
Caution:At this time, be aware that LCD panel cable 7 is
connected to the PCB on the right side.
7
6
Push
2
4
3
A
Avoid interference
with Front Cover
Rear side of the
sewing machine
Cable clip band
1
–6–
1-6. Looper cover guide
○ Loosen and remove the setscrews 1.
○ Remove the cover with the knife changeover lever
aligned with the position of notch on the cover.
1
1
1-7. The cloth plate cover
○ Open the cloth plate. Remove three screws 2 to
remove safety switch 1.
○ Loosen and remove the setscrews 3.
○ Remove the cloth plate.
3
1
2
–7–
2. Installation of the throat plate
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
+ 0.6
1.4 - 0.2 mm
(B)
3
(A)
2
1
Lower knife
Thread sliding
segment lever
ON
(C)
Thread sliding
segment lever
OFF
1
4
Parallel
–8–
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Throat plate
2Setscrew
3 Feed dog
4 Thread sliding segment
* Check that all needles are laterally equidistant with respect to the
throat plate slot (A).
* Check that the distance between the needle center and the front edge
+ 0.6
of the throat plate slot is 1.4 - 0.2 mm (B).
* Check to be sure that the lower knife (right end face) is positioned
between the left end and center (C) of the marker dot on throat plate
1 when the lower knife adjustment knob is set at the scale mark 1.
Or, check to be sure that the lower knife (right end face) is spaced 2.5
mm away from the right needle.
How to perform adjustment:
○ Set the thread sliding segment lever in the OFF position.
○ Loosen setscrew 2. Carry out the adjustment by moving throat plate
1 as described below:
a) The feed dog 3 teeth are parallel to the slots in the throat plate 1.
b) The needles are spaced equidistantly with respect to the slots in
the throat plate (A).
c) The distance between the needle center and the front edge of the
throat plate 1 slot is 1.4 +- 0.6
0.2 mm (B).
○ Retighten the setscrews 2 .
○ After the completion of the adjustment, set the thread sliding segment
lever in the ON position to check the parallelism between the throat
plate and thread sliding segment 4. If they are not in parallel to each
other, carry out adjustment referring to "27. Adjusting the thread
sliding segment".
–9–
If the feed dog comes in contact
with the throat plate, abnormal
noise or breakage can be caused.
If the thread sliding segment is
improperly positioned, stitching
failures such that the material is
caught or thread breaks can be
caused.
3. Height of the needle bar
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
(A) 11.16 ± 0.15 mm
(C)
2
(B)
(F)
(E)
(D)
Flat surface
(C)
– 10 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Right hand needle
2 Throat plate
* Check that the distance between the throat plate surface and the OL
right hand needle point with the needle bar at the highest point of its
stroke is 11.16 ± 0.15 mm (A) when using needle system 130/705H.
ORGAN NEEDLE HA×1 (130/705H) #11 setting
SCHMETZ NEEDLE (130/705H 15×1H) #80 setting
(
)
How to perform adjustment:
○ Remove screw (E) of the needle threader to remove needle threader
unit (F).
○ Loosen the setscrew (B) of the needle bar connection (C) slightly.
(The needle bar should not slip down. If the needle bar slips off, refer
to the orientation of the needle bar connection.)
○ Allow the needle bar (D) to reach its highest position.
○ Move needle bar (D) up and down by hand to adjust dimension (A) is
obtained.
○ Retighten the setscrew (B).
○ After the completion of the adjustment, adjust the needle threader.
Refer to "20. Adjusting the needle bar connection guide of the
needle threader" and "21. Adjusting the needle threader hook".
If the height of the needle bar differs from the standard adjustment,
stitching failures such as stitch
skipping and thread fraying can be
caused.
Orientation of needle bar connection (C)
○ The needle bar connection should be placed with its flat surface up.
– 11 –
If the orientation of the needle bar
connection is wrong, the needle
bar connection can interfere with
the needle bar bushing, disabling
rotation of the sewing machine.
4. Position of the feed dog
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
Interference should be prevented
(B)
1
(D)
1 mm (C)
(When the feed
amount is maximized/
differential feed ratio:
0.7/ closest point)
2
(E)
3
(A) Equidistant clearance
– 12 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Main feed dog
2 Sub feed dog
3 Throat plate
* Check that the feed dog and the slot in the throat plate 3 are parallel
with each other, that the clearances on the right and left side of the
feed dog are equal (A).
* Maximize the feed amount (scale mark: 4). In this state, check to be
sure that the main feed dog 1 is at the most retracted position and
main feed dog 1 does not interfere with throat plate 3 (B).
* Check at the most-advanced position in max. main feed and min. subfeed the clearance between the main feed dog 1 and the sub-feed
dog 2 is 1 mm (C).
How to perform adjustment:
○ Maximize the feed amount (scale mark: 4). Move main feed dog 1 to
the most retracted position.
○ Loosen the setscrews (D) of the main feed dog 1.
○ Move main feed dog 1 to adjust so that it does not interfere with
throat plate 3.
○ Retighten the setscrews (D).
○ Maximize the feed amount (scale mark: 4). Adjust the differential feed
ratio to 0.7. Bring main feed dog 1 and sub feed dog 2 to the position where they are closest to each other.
○ Loosen the setscrews of the sub-feed dog (E).
○ At the most-advanced position in max. main feed and min. sub-feed,
move the sub-feed dog back and forth, to perform adjustment so that
the clearance between the main feed dog 1 and the sub-feed dog 2
is to be 1 mm (C).
○ Retighten the setscrews (E).
– 13 –
If the clearances on the right side
and left side of the feed dog are
not equal, the feed dog can interfere with the throat plate. In addition, irregular feed and wrinkles on
the material can be caused.
5. Adjusting the stroke of the sub feed dog
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
(A’)
(A)
2
(A’)
(A)
Same line
3
1
3
(C)
(B)
– 14 –
2
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Main feed dog
2 Sub feed dog
3 Throat plate
* Adjust the stitch length to 4 mm.
* Set the differential feed ratio at "N".
* Turn the handwheel to move the feed dog up and down. Measure the
clearance provided between main feed dog 1 and sub feed dog 2
when the tip of feed dog teeth is aligned with the top surface of throat
plate 3 both in the ascending and descending operations. The difference between these two measurement values (A - A') has to be 0 ± 0.1
mm.
How to perform adjustment:
○ Loosen the setscrew (B) of the eccentric stud (C).
○ Turn the eccentric stud (C) to perform adjustment.
○ Retighten the setscrew (B).
– 15 –
If the difference in the aforementioned clearances deviates from
the standard adjustment, the stitch
length in the actual sewing will differ from the indicated stitch length
shown on the knob.
6. Height of the feed dog
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
(A) 1.3 mm
(C)
(B)
– 16 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Front end of feed dog
* Adjust the stitch length to 2.5 mm. Set the differential feed ratio at "N".
Bring the sub feed dog to its highest position. At this time, check that
the height of foremost section 1 of the sub feed dog with respect to
the top surface of the throat plate is 1.3 mm (A).
How to perform adjustment:
○ Set the feed dog in its highest position.
○ Loosen the setscrew (B) from the eccentric stud (C).
○ Turn the eccentric stud (C) to perform adjustment.
○ Retighten the setscrew (B).
– 17 –
○ If the sub feed dog height is
larger than the standard adjustment value, the needle can
sway or break when sewing a
heavy-weight material. In addition, the feed dog marks can
be left on the material or puckering is likely to occur when
sewing a light-weight material.
○ If the sub feed dog height is
smaller than the standard adjustment value, the efficiency
of feed can be reduced.
○ If the sub feed dog is positioned too high, chain-off
thread can be excessively
tensed.
○ If the height of the main feed
dog and that of the sub feed
dog are not equal, the expected differential feed effect
cannot be achieved.
7. Feed dog timing
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
(A)
Alignment
2
3
(B)
– 18 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Right hand needle
2 Throat plate
3 Sub feed dog
* Adjust the stitch length to 2.5 mm. Set the differential feed ratio at "N".
When sub feed dog 3 and right needle 1 go up, check that the tip of
right needle 1 and tip of the teeth of sub feed dog 3 are simultaneously aligned with the top surface of throat plate 2.
How to perform adjustment:
○ Loosen the setscrews (A).
○ Rotate the feed excenter cam (B) to make adjustment.
○ Retighten the setscrews (A).
– 19 –
If this timing is not properly adjusted, needle breakage, puckering
and incorrect feed amount can be
caused.
8. Position of the balance weights and the cams
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
2
5
3
4
– 20 –
6
Adjustment Procedure
Results of Improper Adjustment
1
2
3
4
5
Knife driving cam
Feed cam
Lower looper cam
Upper looper cam
Needle driving cam
○Screw No. 1 is tightened in the flat section of the main shaft
(the figure below).
6 Positioning collar
7 Marker on the handwheel
○The marker is aligned with the marker on the side face of the
cover at the upper dead point of the needle.
5
Screw No. 1
– 21 –
If the marker on the handwheel
cannot be aligned with the marker
on the cover:
Deviation by 180º: The handwheel is installed in the wrong
manner. Remove the handwheel
and re-install it with turned by
180º.
Deviation by approximately
120º: The screw No. 1 of needle
driving cam 5 is incorrectly positioned.
9. Projecting amount of the upper looper
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(A) 6.8 ± 0.3 mm
1
2
(D)
)0
(E
(C)
(B)
– 22 –
±
5
0.1
mm
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Left hand needle
2 Upper looper
If the standard adjustment value is
exceeded, stitch skipping can be
caused.
* Check that distance (projecting amount) A from the left end of left
hand needle 1 to the blade point of upper looper 2 is 6.8 ± 0.3 mm
when the upper looper is in its leftmost position.
How to perform adjustment:
○ Bring upper looper 2 to its leftmost position.
○ Loosen setscrew (B) of the upper looper arm.
○ Adjust the projecting amount of the upper looper by moving upper
looper siding shaft (C) up and down.
○ Tighten setscrew (B) of the upper looper arm.
○ Turn the handwheel to check whether the rotation torque is increased.
○ Loosen screw (D). Adjust so that a clearance of 0 ± 0.15 mm (E) is
provided between the needle and the upper looper.
– 23 –
10. Radius of the lower looper
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
(A) 6
5.5 ±
0.15
mm
3
2
– 24 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Lower looper setscrew
2 Lower looper shaft
3 Lower looper
* Check that the distance from the center of the lower looper shaft 2 to
the lower blade point is 65.5 ± 0.15 mm (A).
How to perform adjustment:
○ Loosen the setscrew 1 of the lower looper 3.
○ Move the lower looper 3 up or down to make adjustment.
○ Retighten the setscrew 1.
– 25 –
11. Adjustment of the loop lift
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
4
31.58 mm
1
Gauge needle
2
(E)
0 to 0.05 mm
4
2
3
(D)
(A)
(C)
(A)
(B)
– 26 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1
2
3
4
Right hand needle
Lower looper blade point
Lower looper
Gauge needle (Cut the top end of needle for use. L = 31.58 mm)
* Check that the clearance between the needle 1 and the lower looper
blade point 2 is 0 to 0.05 mm (E).
* Turn the handwheel and check that the lower looper blade point 2
meets with the left side of gauge needle 4 when lower looper 3 goes
and back.
(Insert the gauge needle into the needle hole for the right needle.)
How to perform adjustment:
○ Loosen the setscrews (C) of the lower looper support arm (D).
○ Move the lower looper support arm (D) back or forth and adjust the
clearance between the needle 1 and the lower looper blade point 2.
○ Retighten the setscrews (C).
○ Adjustment of the lower looper cam timing.
・Loosen the setscrews (A) of the lower looper cam (B).
・Check the position of the lower looper blade point 2 and the gauge
needle 4 while turning the lower looper cam (B). Change the position of the cam little by little so that the left side of gauge needle 4
can meet with the lower looper blade point 2 on both ways of going
and back.
・Retighten the setscrews (A).
– 27 –
If the clearance between the needle and the lower looper is larger
than the standard adjustment
value, needle thread skipping can
be caused.
If the clearance between the
needle and the lower looper is
smaller than the standard adjustment value, the needle comes in
contact with the looper, resulting in
needle breakage or needle thread
skipping can be caused. In addition, the looper blade point can
be damaged, resulting in thread
fraying and thread breakage.
12. Timing between upper and lower looper
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(B)
(C)
(A)
2
1
(A) 1 ± 0.5 mm
(A)
1
2
.1
)0
(B
to
0.3
mm
(D)
(E)
– 28 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Lower looper
2 Upper looper
* Check that the clearance between the projecting part of the lower
looper 1 and the blade point of the upper looper 2 is 1 ± 0.5 mm
(A) when the upper looper goes up and the upper looper blade point
meets the lower looper.
* Check that the front-to-back clearance between the upper looper blade
point and the lower looper 1 is 0.1 to 0.3 mm (B).
How to perform adjustment:
○ Loosen the setscrews (E) of the upper looper cam.
○ Rotate the upper looper cam (D) to make adjustment (A).
○ Retighten the setscrews (E).
○ Loosen the setscrew (C) of the upper looper 2.
○ Move the upper looper 2 front back to make adjustment (B).
○ Retighten the setscrew (C).
– 29 –
If the clearance is larger than the
standard adjustment value, stitch
skipping can be caused.
If the clearance is smaller than the
standard adjustment value, the
relevant parts can come in contact
with each other, resulting in abnormal noise and abrasion.
13. Installation of the needle guards
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(E)
mm
0.1
o
t
0
3
1
2
(C)
0.05
(B)
(D)
– 30 –
.2
to 0
(A)
mm
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Throat plate
2 Rear movable needle guard
3 Front needle guard
* Check that the clearance between the needle and the front needle
guard and that between the needle and the rear movable needle
guard are 0.05 to 0.2 mm (A) and 0 to 0.1 mm (E).
How to perform adjustment:
○ If the knife driving rod (D) is in its lower position (as shown in the
figure), operate the knife changeover lever to lower the knife.
○ Set the needle bar in its lowest position of the stroke.
○ Loosen the setscrews (B) of the rear movable needle guard 2.
○ Move the rear needle guard 2 to make adjustment.
○ Retighten the setscrews (B).
○ Loosen the setscrews (C) of the front needle guard 3.
○ Move the front needle guard 3 to make adjustment.
○ Retighten the setscrews (C).
– 31 –
○ Clearance between front needle
guard 3 and the needle:
・ If this clearance is larger than the
standard adjustment value.... The
looper blade point and the needle
come in contact with each other,
resulting in needle breakage and
blade point breakage.
・ If this clearance is smaller than
the standard adjustment .... Needle bending and stitch skipping
can be caused.
○ Clearance between rear movable
needle guard 2 and the needle:
・ If this clearance is larger than
the standard adjustment value....
The needle can sway resulting in
stitch skipping.
・ If this clearance is smaller than
the standard adjustment .... The
needle can be caught between
the both needle guards to cause
the needle guards to wear out
and to be damaged by the needle.
14. Adjusting the looper thread take-up
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(A)
1
– 32 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Looper thread take-up thread guide
* The standard position of the looper thread take-up is the center of the
slot.
How to perform adjustment:
○ Loosen the setscrews (A).
○ Move thread guide 1 to the right and left.
○ Tighten screw (A).
In this state, operate the looper threader while preventing the pipe
from interfering with the thread guide.
– 33 –
○ If the thread guide is moved to
the right, the amount of slack of
the looper thread will be reduced.
○ If the thread guide is moved to
the left, the amount of slack of
the looper thread will be increased.
15. Height and lateral position of the presser foot
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(A) 4.8 to 5.0 mm
1
The presser foot and the
teeth slits have to be in
parallel to each other.
(D)
(B)
(C)
– 34 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Throat plate
* Raise the presser foot using the lifting lever and check that the distance between the throat plate surface and the presser foot sole is 4.8
to 5.0 mm (A).
* Check that the presser foot is parallel to the feed dog slot (D) in the
throat plate 1.
How to perform adjustment:
○ Raise the presser foot by lifting the lever.
○ Loosen the setscrew (B) of the presser bar guide bracket.
○ Move the presser bar (C) up or down and turn it to make adjustment.
○ Retighten the setscrew (B).
– 35 –
If the height of the presser foot is
excessively high, the needle threader cannot enter the presser foot
when the presser foot is raised.
If the height of the presser foot is
inadequate, operability such as
the ease of material setting can be
affected.
If the presser foot is not in parallel
to the teeth slits, bad straightness
can be caused.
16. Adjusting the floating of the disk of the thread tension controller
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
Clearance: 0.9 mm or more
3
1
2
– 36 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Tension release actuating bracket
2Setscrew
3 Thread tension adj. knob
* Lift the presser foot. Set the thread tension adjustment knob at "4". At
this time, check that the lower looper thread tension is released.
* Check that a clearance of 0.9 mm or more is provided between the
lower looper thread tension disks (clearance between two disks).
How to perform adjustment:
○ Loosen the setscrew 2 of the tension release actuating bracket 1.
○ Move the tension release actuating bracket 1 left or right to perform
adjustment.
○ Retighten the setscrew 2.
– 37 –
If the releasing amount of the disks
is inadequate, thick thread cannot
pass between them smoothly.
17. Adjusting the tension of the thread tension controller
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
3
2
To decrease
To increase
1
Mark
– 38 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Thread tension adj. knob
2 Thread tension gear
* Using Junior Spun thread #90 or FUJIX King Polyester Spun #90,
check that the thread tensions are the numeric values shown below.
(Scale mark on the knob "4")
Standard tension table
Left-hand
Right-hand Upper looper Lower looper
needle thread needle thread
thread
thread
Scale
mark on 0.39±0.05N
the knob (40±5g)
"4"
0.15±0.03N
(15±3g)
0.11±0.03N
(11±3g)
0.10±0.05N
(10±5g)
How to perform adjustment:
○ Set thread tension adjustment knob 1 at scale mark "4" (position of
the mark on the left side).
○ Lift the thread tension gear fixing claw 3. Adjust the thread tension
by moving thread tension gear 2 with a Phillips screwdriver.
The tension is increased by turning the gear clockwise. It is decreased by turning the gear counterclockwise.
If the thread tension deviates from
the standard adjustment value,
sewing failures can be caused
when carrying out sewing with the
thread tension described in the
Instruction Manual.
Caution: If thread tension gear fixing claw 3 is lifted excessively,
the claw can break.
If the thread tension is excessively high, thread breakage can be
caused.
– 39 –
18. Position of the needle thread take-up thread guide
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(B)
(A)
1 to 2 mm
(C)
– 40 –
Adjustment Procedure
Results of Improper Adjustment
* Check that the size of the needle thread loop is 1 to 2 mm (A) when
the lower looper blade point meets the needle center when sewing
two plies of cotton broad cloth with No. 90 spun thread.
If the needle thread loops are
excessively large, the loops will fall
down to disable the lower looper to
scoop the loops, causing stitch skipping. In addition, the looper blade
point prongs the needle thread,
resulting in needle thread fraying. (In
particular, filament thread which is
likely to untwine)
Checking items:
How to perform adjustment:
○ Loosen the setscrew (C) of the needle thread guide (B).
○ Move the needle thread guide (B) up or down to make adjustment.
(The higher the needle thread take-up guide is raised, the larger the
needle thread loops will become.)
○ Retighten the setscrew (C).
(As the needle thread guide is moved up, the needle thread loop will be
larger.)
– 41 –
If the needle thread loops are
excessively small, stitch skipping
and needle thread fraying can be
caused. (In particular, the material
which cannot be fed smoothly)
19. Tension of the belt
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
* The motor comes in three different types according to the destination. They are
different in the screw locations, etc. However, the standard adjustment value is
same.
3
1
2.5 to 5 mm
(A)
1.96N
(200g)
3
2
Motor for CE
– 42 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1Belt
2Motor
3Nuts
* Sewing speed: Up to 1,350 ± 150 sti/min
* The belt should slacken approx. 2.5 to 5 mm under a 200 gr. load (A).
When the tension is excessively
increased, the load applied to the
motor is increased to cause reduction in the number of revolutions
and motor heating.
When the tension is excessively
decreased, irregular rotation due to
the belt teeth skipping or abnormal
noise due to the belt vibration can
occur.
How to perform adjustment:
○ Loosen the nuts 3 of the motor 2.
○ Carry out adjustment by moving motor 2.
○ Retighten the nuts 3.
* For the motor destined for CE (export in general), nut 3 is substituted by a cross slot screw. In addition, the location of the screw is
different from the other motors. However, the standard adjustment
value is same.
– 43 –
20. Adjusting the needle bar connection guide of the needle threader
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
2
Clearance
0.3 ± 0.2 mm
1
(C)
(A)
(B)
Clearance 0.2 to 1 mm
(It should be noted, however, that
the clearance has to be re-adjusted
in the case the hook adjustment is
carried out in the next clause.)
Measure of
clearance: 2 mm
3
(F)
1
5
Press against
this section
(D)
(E)
4
– 44 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1
2
3
4
5
Needle bar connection guide
Needle bar connection
Presser bar connection
Needle bar connection guide plate
Needle threader shaft pin
* A clearance of 0.3 ± 0.2 mm has to be provided between needle bar
connection 2 and needle bar connection guide 1.
* There has to be a clearance between presser bar connection 3 and
needle bar connection guide 1. (Measure of clearance: 2 mm)
* There has to be a clearance between needle bar connection guide
plate 4 and needle threader shaft pin 5.
How to perform adjustment:
Caution: Adjust the height of the needle first. When the needle bar
connection is adjusted, the adjustment value of the needle
bar height changes due to the change in positional relation
between the needle bar connection and the needle eyelet.
As a result, the hook fails to enter the needle eyelet.
1. Remove screw (A). Remove needle thread take-up (B).
2. Loosen screw (C). Adjust the position of needle bar connection guide
1. The distance from the guide to needle bar connection 2 is 0.3 ± 0.2
mm. At this time, fix the needle bar connection at the position where it
does not interfere with presser bar connection 3.
A measure of the clearance provided between needle bar connection
guide 1 and needle bar connection 3 is 2 mm.
3. Tighten screw (C).
4. Adjust the lateral position of connection guide plate 4.
Move operation lever (D) and observe the clearance provided between
connection guide plate 4 and needle threader shaft pin 5.
Loosen screw (E) and carry out adjustment by moving the connection
guide plate to the right and left.
At this time, press stopper (F) against the section shown with an arrow.
Reference: In the case the hook is to be adjusted in the next clause,
the needle bar connection guide has to be re-adjusted
after the adjustment of the hook. The needle bar connection guide, in this clause, should be adjusted so that it
does not interfere with the needle bar connection.
5. After the completion of the adjustment, install needle thread take-up (B)
with screw (A).
– 45 –
If the clearance exceeds the
standard adjustment value, the
needle bar connection guide can
interfere with the frame or other
parts, causing abnormal noise and
breakage.
If there is no clearance between
the needle bar connection guide
and the presser bar connection,
the needle threader cannot operate since those two parts interfere
with each other.
21. Adjusting the needle threader hook
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
1
Adjustment of the
lateral position
Needle
Vertical position:
Avoid interference
with the lower end
of needle eyelet.
(C)
(A)
1
Needle
1.8 mm
(B)
Adjustment of the
vertical position
(D)
<Cross-sectional view of the
needle eyelet>
The state where the hook enters
the needle eyelet
Carefully check that the thread threader
shaft is in parallel to the needle bar.
If not, the operating lever cannot be
operated smoothly.
– 46 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1Hook
* Hook 1 has no vertical/lateral bend. It has to be equidistantly spaced
from the right and left guide plates.
* Check that hook 1 enters the eyelets in the right and left needles to
thread the needles. (The needle threader supports needle counts #1
to #4.)
* Check whether the lower end of hook 1 interferes with the needle. If
there is interference between them and cannot be corrected, replace
the needle threader with a new one.
How to perform adjustment:
1. Loosen the setscrews (A) and (B).
2. Adjust the lateral position of the hook by moving base (C) to the right
and left. Move the operating lever downward until the threading position is reached.
Adjust the lateral position of base (C) by turning hook asm. (D) so
that the hook enters the right needle eyelet. Then, fix base by tightening screw (A).
At this time, fix the threading shaft so that it is in parallel to the needle bar. (It is accepted to visually check the parallelism.)
3. Adjust the vertical position of hook asm. (D) by moving it in axial
direction. Bring the hook to the position where the lower end of the
hook does not interfere with the lower end of the needle eyelet and
fix the hook at that position with screw (B).
The jutting amount of the hook from the needle eyelet is 1.8 mm.
After the adjustment, lift the operating lever. At this time, check
whether the hook does not interfere with the presser bar and the needle clamp.
– 47 –
If the threader shaft is not in parallel to the needle bar, the operating
resistance of the operating lever
can increase when the lever is lifted
from the threading position.
If the jutting amount of the hook
from the needle eyelet deviates
substantially from the standard
adjustment value, interference
between the hook and the needle
clamp and needle bar can occur.
22. Adjusting the looper threader timing
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
2
Recess
1
6
4
5
3
Insert straightway
– 48 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1
2
3
4
5
6
Positioning collar
Positioning collar screw
Thread inlet bracket
Thread inlet bracket screw
Changeover lever
Positioning shaft
How to perform adjustment:
Adjustment is to be carried out with the cover removed. It is recommended to attach changeover lever 5 to facilitate adjustment.
1. Loosen two screws 2 of positioning collar 1.
Move positioning collar 1 so that it can be detached from positioning
shaft 6.
2. Loosen three screws 4 of thread inlet bracket 3.
Turn the pulley to the angle at which the looper is brought to the
position shown in the figure. (So that the pipe and the pipe cradle
bushing are aligned in a straight line) Move the lever to the threading
state.
At this time, adjust the position of thread inlet bracket 3 and the angle of the main shaft so that the pipe enters the pushing straightway.
* Deviation as large as approximately 0.5 mm is permitted.
3. Tighten thread inlet bracket screw 4.
4. Keeping the threading state, fit positioning shaft 6 in the recess in
positioning collar 1 and fix them with positioning collar screw 2.
– 49 –
Threading failure due to incorrect
positioning of the thread inlet bracket can be caused.
23. Adjusting the pump unit
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
3
2
Toward the
ground wire
1
6
5
Spray grease lightly
to the periphery.
4
– 50 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Motor screw
2 Motor gear
3 Piston gear
4 Cylinder screw
5Cylinder
6 Piston lip
* The backlash between motor gear 2 and piston gear 3 is approximately 0 to 0.5 mm.
* Check to be sure that piston lip 6 and cylinder 5 smoothly slide. If
not, abnormal noise can be produced.
How to perform adjustment:
Adjusting the backlash
1. Loosen motor screw 1.
2. Press motor gear 2 against piston gear 3.
Adjust the backlash between them to approximately 0 to 0.5 mm.
Carefully prevent a partial increase in torque which can occur in the
case the motor is excessively pressed against the piston gear.
3. Tighten motor screw 1.
At this time, place the ground wire so that its orientation is as shown
in the figure.
If the backlash is larger than the
standard adjustment value, abnormal noise can be caused.
Applying grease to the piston lip
1. Remove three cylinder screws 4. Remove cylinder 5.
2. Spray grease lightly to the periphery of piston lip 6.
If the lip periphery has a damage, replace it with a new one.
3. Mount cylinder 5 with three cylinder screws 4.
If the piston lip periphery is not
applied with an adequate amount of
grease, an increase in the operating resistance of the cylinder can
increase causes the air pressure
reduction, resulting in threading
failure.
If the amount of grease is excessive, grease can be mixed into the
air in the cylinder to cause thread to
be stained with grease.
– 51 –
Increase in torque which occur
the case the motor is excessively
pressed against the piston gear can
result in threading failure and motor
heating.
24. Position of the lower knife
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
(A) 0 to 0.3 mm
7
6
2
3
5
4
– 52 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Throat plate
2 Lower knife presser plate
3Setscrew
4 Lower knife support plate
If the knife juts out from the throat
plate, the material can be caught by
the jutted section to cause irregular
feed, needle breakage and material
puckering.
5Setscrew
6 Lower knife
7 Lower knife angle adjustment stand
* Check that the distance between throat plate 1 surface and lower
knife 6 is 0 - 0.3 mm (A).
How to perform adjustment:
○ Loosen the setscrews of the lower knife presser plate and the support plate (3, 5).
○ Move the lower knife 6 up or down to make adjustment.
○ Move the lower knife support plate 4 to the underside of the lower
knife 6.
○ Retighten the setscrews 3 and 5.
* In case of bad fabric cutting, it is possible to adjust the angle of
Lower Knife.
How to perform adjustment:
○Loosen the setscrew 3.
○ Put hexagonal wrench (2mm) into Lower Knife Angle Adj. Stand 7
and move the wrench clockwise slightly.
○ Retighten the setscrew 3.
– 53 –
If the knife position is too low, the
material jamming and material cutting failure can occur.
25. Engagement of the upper knife with the lower knife
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(B) 1 to 1.5 mm
3
1
2
– 54 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Upper knife
2 Upper knife screw
3 Lower knife
If the depth of mesh of the knives
is smaller than the standard adjustment value, material cutting failure
can occur.
* Check the engagement of the upper knife 1 with the lower knife 3
when the upper knife 1 is in the lowest position.
・Vertical engagement: 1 to 1.5 mm (B).
How to perform adjustment:
○ Set the upper knife 1 in its lowest position.
○ Loosen upper knife screw 2. Adjust the position of upper knife 1 by
moving it up and down.
○ Tighten upper knife screw 2.
– 55 –
If the depth of mesh of the knives is
larger than the standard adjustment
value, the correct timing between
the knives and the feed cannot be
achieved to cause irregular feed
and material puckering.
26. Adjusting the timing of the upper knife
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
1
3
Screw No. 1
Direction of rotation
(D)
2
(C)
(B)
<Cross-sectional view
of cam C>
The screw No. 1 faces
perpendicularly upward
when the knife is in its
upper dead point.
(A)
– 56 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Upper knife
2 Feed dog
3 Throat plate
If the knife timing is not correct, the
material can be fed while the upper
knife is descending to cause puckering and irregular feed.
* The standard timing is achieved in the case the upper knife is brought
to its upper dead point when the feed dog starts coming down.
(The upper dead point of the needle bar is approximately aligned with
the upper dead point of the knife.)
(The knife cuts the material when the feed is positioned below the
throat plate.)
How to perform adjustment:
○ Loosen screws (A). Remove cover (B).
○ Loosen screws (D) of cam (C).
○ Turn the main shaft while keeping the screw No. 1 of the cam held
perpendicularly until the position where feed dog starts coming down
is reached. When that position is reached, tighten screws (D). (The
upper dead point of the needle is approximately aligned with the upper dead point of the knife.)
○ Turn the mains shaft to check that the shaft can be turned smoothly.
○ Install cover (B) with screws (A). Tighten the screw on the side of the
cover first.
– 57 –
27. Adjusting the thread sliding segment
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(A) 8 mm or more
2
2
Parallel to the throat plate
1
(B)
(C)
Provided with
MTC (M/ML type)
(D)
Not provided
with MTC
– 58 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Throat plate
2 Thread sliding segment
* The distance from the throat plate to the tip of the thread sliding segment is to be 8 mm or more (A).
* The throat plate and the thread sliding segment have to be in parallel
to each other.
How to perform adjustment:
The adjusting procedure (location of the screw) differs depending on
with/without the MTC.
【MO-1000M and ML (provided with the MTC)】
○ Loosen the setscrews (B).
○ Move thread sliding segment 2 forward. In this state, adjust the
position of the thread sliding segment by moving base (C) so that it is
spaced 8 mm or more (A) from and is in parallel to throat plate 1.
○ Retighten the setscrews (B).
【MO-1000 (not provided with the MTC)】
○ Loosen screws (D) which are located on the opposite side.
○ Move thread sliding segment 2 forward. In this state, adjust the
position of the thread sliding segment by moving base (C) so that it is
spaced 8 mm or more (A) from and is in parallel to throat plate 1.
○ Retighten the setscrews (D).
– 59 –
If the thread sliding segment juts
out of the throat plate, the material or thread can be caught by the
jutted section.
28. Adjusting the safety switch
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
(A)
1
(C) when the presser foot is lifted
(C) when the presser foot is lowered
2
(B)
Approximately 1 mm clearance
– 60 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
○ Unexpected operation can occur due to a malfunction of the
respective switches.
1 Cloth plate safety switch
2 Presser foot lifter safety switch
* Cloth plate safety switch 1 has to return smoothly when it is pressed.
* Presser foot lifter safety switch 2 is to have a clearance when the
presser foot is lifted. It should be remembered, however, that the
presser foot lifter safety switch must not be excessively pressed
when the presser foot is lowered. (If excessively pressed, a deformation of the cover, etc. can be caused.)
How to perform adjustment:
Adjusting the cloth plate switch
○ Loosen the setscrews (A).
○ Install the switch at the center of the slot with lightly pressed.
○ Tighten screw (A). Check to be sure that switch can be smoothly
turned ON/OFF.
Adjusting the presser foot lifter switch
○ Loosen the setscrews (B).
○ Adjust the presser foot lifter switch 2 so that a clearance of approximately 1 mm is provided between the switch and the shaft (C) when
the presser foot is lifted.
○ After the adjustment, tighten screws (B). Lower the presser foot to
check that the shaft (C) does not excessively press the switch 2.
– 61 –
○ If the presser foot lifter safety
switch is excessively pressed, it
can break or malfunction.
29. Position of the cloth plate
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Standard adjustment
2
(C)
0.1 to 2.0 mm
3
1
(D)
(C)
(B)
0 to 0.8 mm
(A) 0 to 0.5 mm
– 62 –
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1 Throat plate
2 Cloth plate
3 Rear cover
* Check that the clearance between the cloth plate 2 and the throat
plate 1 is 0 to 0.5 mm (A) and 0 to 0.8 mm (B).
* Check that the clearance between the cloth plate 2 and the rear
cover 3 is 0.1 to 2.0 mm (C).
How to perform adjustment:
○ Loosen the setscrews (C) of the cloth plate hinge (D).
○ Move the cloth plate with the hinge (D) in its correct position.
Pass the safety switch cable above the hinge.
○ Retighten the setscrews (C).
– 63 –
○ If there is no clearance between
the cloth plate and the throat
plate and between the cloth
plate and the rear cover, abnormal noise can be produced
during operation.
○ Assemble the relevant parts
taking care not to allow the
safety switch to be caught.
– 64 –
MOTOR_SUB_ASSY
LM
2P
CN1
CN5
CN4
CN3
CN2
POWER_SUPPLY
2P
CN21
The boxed section is only used for the MO-1000ML. It is not
used for the MO-1000M.
FOOT_CONTROLLER
AC IN
L
M
MOTOR
3P
2P
2P
3P
3P
CN14
CN11
CN15
CN13
CN12
14P
6P
Microprocessor PCB (asm.)
PUNP MOTOR
Display PCB (asm.)
Switch PCB (asm.)
LED_PCB_B_ASSY
LED_PCB_A_ASSY
PUMP_MOTOR_ASSY
SAFETY_SW_CABLE_ASSY
4 CIRCUIT DIAGRAM
For the sewing machines for the Japanese market (MO-1000M, MO-1000ML)
FOOT_CONTROLLER
AC IN
MOTOR_SUB_ASSY
LM
L
M
MOTOR
2P
CN1
– 65 –
CN5
CN4
CN3
CN2
POWER_SUPPLY
2P
CN21
2P
2P
Unused
3P
PUNP MOTOR
LED_PCB_B_ASSY
LED_PCB_A_ASSY
PUMP_MOTOR_ASSY
SAFETY_SW_CABLE_ASSY
For the sewing machines for overseas market (MO-1000)
5 MAINTENANCE
1. Lubrication
Apply oil to the section (near the upper looper shaft) described in the Instruction Manual.
Before lubrication, remove dust or cloth chips from the section to be applied with oil.
2. Grease application
After the disassembly of the section to/in which grease is applied or filled, re-apply or re-fill grease. The recommended grease is as described below:
JUKI Grease A
・Tube (10 g) JUKI part No.: 40006323
・Tube (100 g) JUKI part No.: 23640204
If you do not have a grease pump, it is recommended to fill a plastic oiler with grease or to use a syringe without a needle.
・Syringe specifically for grease application JUKI part No.: GDS01007000
3. Looper threader
Do not lubricate inside the pipe. If the inside of the pipe is contaminated with oil, thread cannot be passed
through it.
In addition, thread cannot be passed through the pipe either after having passed a thread absorbed with silicon oil through it.
Should the pipe is lubricated
Remove oil from inside the pipe by passing a thick thread (cotton thread count of which is #20 or
smaller) through the pipe. Or, blow away the oil from inside the pipe with high-pressure air.
If the thread still cannot be passed smoothly through the pipe, other causes such that the mixture of lint
and oil adheres near the pipe joints or thread inlet section should be considered. In such a case, detach
the pipe and clean it up with degreaser or the like.
– 66 –
– 67 –
1. Needle thread breakage
Trouble
Needle guard
Needle
Thread
Thread tension
Contact
1-4)
1-5)
1-6)
1-7)
Thread path
1-2)
1-3)
Threading
1-1)
Case (1)
The lower looper has been improperly positioned and strikes the feed dog or throat
plate.
The thread tension controller is poorly adjusted.
6-B)
7-A)
The thread tension is too high.
The thread is weak because of its poor
quality.
The needle is too thin for the thread.
6-A)
5-A)
4-A)
The needle hits the needle guard intensely,and sharp edges are produced on them,causing thread breakage.
Bend or deformation of the thread path.
2-B)
3-A)
Scratches, burrs or rust on the pawls or
needle holes of the throat plate, stitch
tongue, lower looper, needle thread take-up,
needle thread presser spring, thread guide,
or tension discs causes friction.
The thread is entangled with the thread
guide, or the machine head has been incorrectly threaded.
2-A)
1-A)
Case (2)
To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work
after turning the power off and ascertaining that the motor is at rest.
WARNING :
6 TROUBLES AND CORRECTIVE MEASURES
Properly position the lower looper.
Adjust the thread tension controller so that the
standard thread tension is obtained.
Reduce the thread tension. Check whether the
needle thread take-up guide and needle thread
guide are positioned too high, causing such
excessive thread tension.
Replace the thread by one with good quality.
Replace the needle by a proper one.
Replace the needle and needle guard if they
have worn.
Correct the thread path or replace it with a new
one.
Remove such scratches, burrs, etc. and
perform thread path finishing. Replace major
components such as looper, which have been
deformed, causing thread breakage.
Refer to the threading diagram.
(Refer to the Instruction Manual)
Check and Corrective measures
– 68 –
3. Needle breakage
2. Looper thread breakage
Trouble
Upper looper position
Contact with the looper
Needle guards
Needle No.
Thread tension
Height of the feed dog
or needle
3-2)
3-3)
3-4)
3-5)
3-6)
3-7)
Thread tension
2-3)
Needle entry
Adjustment of the
looper thread take-up
2-1)
3-1)
Thread path
2-1)
Case (1)
Scratches on the inside of the pipe.
1-C)
7-A)
6-A)
5-A)
4-A)
3-A)
2-A)
1-A)
3-B)
3-A)
The feed dog is too high, or the needle is
too low, causing the needle to deflect with
resultant needle breakage.
The thread tension is too high.
The needle is too thin for the materials.
A needle guard has been improperly positioned, causing the needle point to strike it.
The needle strikes the looper, resulting in
needle breakage.
The upper looper juts out too much or it is
too low.
The needle entry has not been correctly
adjusted, and the needle strikes the throat
plate or presser foot.
The thread tension controller is poorly adjusted.
The looper thread tension is too high.
The looper thread take-up or thread guide
has been improperly positioned, causing
excessive thread tension.
Burrs and scratches on the end face of the
thread path pipe.
1-B)
2-A)
Scratches, burrs, rust, etc, on the paw of
the throat plate, stitch tongue, looper, looper
thread take-up, thread guide, or tension
discs causes friction.
1-A)
Case (2)
Refer to the pertinent Standard Adjustment.
Reduce the thread tension.
Replace the needle with a thicker one.
Refer to the pertinent Standard Adjustment.
Adjust the looper so that it does not strike the
needle.
Refer to the pertinent Standard Adjustment.
Correct the needle entry.
Adjust the thread tension controller so that the
standard thread tension is obtained.
Reduce the tension while checking the tension
balance other looper thread.
Refer to the pertinent Standard Adjustment.
Pass the thread to the looper. Then, pull the
thread by hand to check whether the thread is
caught inside the pipe.
Deburr or remove scratches from the end face
of the pipe.
Remove such scratches, burrs, etc. and carry
out thread path finishing. Replace loopers or
other components which have been deformed,
causing thread breakage.
Check and Corrective measures
– 69 –
Wrong
side
Needle thread presser
Needle
Needle guards
Height of needle
Positioning of the
needle thread takeup guide and needle
thread guide
Threading
5-3)
5-4)
5-5)
5-6)
5-7)
5-8)
Adjustment of the
loopers
5-2)
The lower looper fails to catch
needle thread loops.
Right
side
Lower looper
Contact with the looper
4-2)
5-1)
Needle guard
4-1)
Case (1)
5. Stitch skipping (needle thread)
4. The needle point is crushed
Trouble
8-A) The thread has been entangled with a
thread guide. The reading has bot been
correctly done.
7-A) The needle thread take-up draws the
thread excessively to produce smaller
loops.
6-A) The needle has incorrect height and
does not properly pick up loops even if
the looper has a correct return.
5-A) Incorrect height or clearance prohibits
correct guide for the needle. If a needle
guard is too high, loops are crushed with
consequent stitch skipping.
4-A) The needle is bent or improperly oriented.
3-A) The duration in which the presser holds
the needle thread is not correct, and
unstable loop result.
2-A) The clearance or the amount of return is
not correct.
1-A) The blade point has defective shape
and does not catch needle thread loops.
2-A) The clearance between the lower looper
and the needle is not correct.
1-A) The needle guard is too low, or its longitudinal position is not correct.
Case (2)
Refer to the threading diagram.
(Refer to the Instruction Manual)
Refer to the pertinent Standard Adjustment.
Refer to the pertinent Standard Adjustment.
Refer to the pertinent Standard Adjustment.
Replace the bent needle. Correctly orient and
attach the needle.
If the needle thread presser has excessively
deformed due to correction, etc., replace it with
a new one.
Refer to the pertinent Standard Adjustment.
Replace the lower looper.
Increase the clearance between the lower looper and the needle.
Increase the height of the needle guard. Check
the clearance between the needle and needle
guard.
Check and Corrective measures
– 70 –
Upper looper
Lower looper
Adjustment of the
loopers
Thread amount
6-2)
6-3)
6-4)
6-5)
The upper looper does not catch
the lower looper thread.
Right
side
Upper
looper
Lower
looper
Needle thread
Wrong
side
7-5)
7-4)
7-3)
Amount of thread
Adjustment of the
upper looper
Needle
Needle height
7-2)
The needle does not take the
upper looper thread.
Right
side
Threading
7-1)
7. Upper looer thread stitches
are skipped
Wrong
side
Threading
6-1)
Case (1)
6. Lower looper stitches are
skipped
Trouble
5-A)
4-A)
3-A)
2-A)
1-A)
5-A)
4-A)
3-A)
2-A)
1-A)
Excessive upper
Needle
looper thread is fed,
producing stack of
thread.
Slack of
thread
The height of the blade point is not correct,making the upper looper unable to
properly pass the thread to the needle.
The clearance between the needle and
the back of the upper looper is not correct.
The needle is bent or crushed, in its point.
The needle, if positioned too high or low,may fail to catch the upper looper thread.
The thread has been entangled with a
thread guide. Threading has not been
done correctly.
Too much lower looper thread is fed, giving slack of thread.
The feed amount of the lower looper,
height of the upper looper, or clearance
produced at time of crossing of the upper
and lower loopers is not correct.
The clearance between the needle and
the back of lower looper are not correct.
The blade point has a bad shape, and
fails to catch the loops.
The thread has been entangled with a
thread guide. Threading has not been
done correctly.
Case (2)
If the thread tension is not enough, increase it.
Shift the thread guide of the looper thread takeup to the right.
Refer to the pertinent Standard Adjustment.
Replace the needle. At this time, be sure to
eliminate the cause for such needle bend or
needle point crush.
Refer to the pertinent Standard Adjustment.
Refer to the threading diagram.
(Refer to the Instruction Manual)
Shift the thread guide of the looper thread takeup to the right.
Refer to the pertinent Standard Adjustment.
Replace the lower looper having a deformed tip.
Replace the upper looper with badly deformed
blade point.
Refer to the threading diagram.
(Refer to the Instruction Manual)
Check and Corrective measures
– 71 –
9. Overlocking needle thread is
loose
* Provided that no chain-off trouble
occurred when sewing operation
was done with materials set on
the machine.
8. Faulty chain-off thread
Trouble
Thread tension
Needle
9-2)
9-3)
Thread tension
8-4)
Position of the needle
thread take-up guide
and needle thread
guide
Adjustment of looper
8-3)
9-1)
Feed dog
Position of the throat
plate
8-2)
8-1)
Case (1)
3-A) The needle is too thin for the thread
used.
2-A) The thread tension balance has been
disturbed.
1-A) They are positioned too high, and the
threadtake-up draws out excessive needle thread.
4-B) The needle thread tension is too high,
causing damaged balance with other
thread tension.
4-A) The thread tension is too low.
Replace it with a proper one.
Refer to the Standard Adjustment for the looper
thread take-up components, and increase the
tension if necessary.
Refer to the pertinent Standard Adjustment.
Check whether the needle thread take-up guide
or needle thread guide is positioned too high
with consequent excessive needle hread tension. And if so, correct it.
Slightly increase the tension.
Refer to the pertinent Standard Adjustment.
Repair or replace the auxiliary feed dog.
2-B) The auxiliary feed dog has scratch.
3-A) Adjustment of loopers for producing
chain-off thread without materials requires higher accuracy.
Refer to the pertinent Standard Adjustment.
Correctly position the throat plate.
Check and Corrective measures
2-A) The auxiliary feed dog is too high, and
interferes with chain-off thread.
The auxiliary feed dog is too low.
1-A) The throat plate has been improperly
positioned longitudinally, and chain-off
thread gets in between the main feed
dog and throat plate, causing defective
chain-off thread.
Case (2)
– 72 –
Right side
Knots are deflected to
the upper looper side.
13-1)
13. Knotting position is not correct
Threading
Knife width
Looper thread take-up
adjustment
11-2)
12-1)
Knife width
11-1)
12. Looper thread bite
11. The looper thread bulges out
Presser foot
10-4)
Thread stand
Thread path
10-3)
10-5)
Knife width
10-2)
The knotting position of the
upper and lower looper threads
varies as shown below.
Looper thread tension
10-1)
Case (1)
10. Irregular stitches
Trouble
Insert the looper pipe until it will go no further.
3-C) The looper pipe is not securely inserted.
1-A) Re-threading after thread breakage, etc.
has been done erroneously.
1-A) The knife width is too large for the overedging width.
2-A) The looper thread take-up draws out
excessive looper thread.
1-A) The knife width is too small for the overedging width.
5-A) Thread dose not come out smoothly.
Refer to the threading diagram.
(Refer to the Instruction Manual)
Use a knife having width suited to the overedging width.
Decrease the radius of the looper thread takeup (left) (reduction in dimension I). Raise the
looper thread take-up (right) (increase in distance O).
Use a knife having width suited to the overedging width.
Make the thread come out smoothly.
Make the presser foot come into contact with
them evenly.
Fix them with adhesive agent.
3-B) The thread path parts have become
loose (instable).
4-A) The presser foot cones into contact
unevenly with the throat plate and feed
dogs and tends to meander.
Check the thread path for scratches.
Make the overedging width slightly smaller than
that given for the knife width.
Slightly increase the upper and lower looper
thread tensions.
Check and Corrective measures
3-A) Scratches on the thread path catch
thread.
2-A) The knife width is unsuited for the overedging width.
1-A) The upper and lower looper thread tensions are not enough.
Case (2)
– 73 –
15. Puckering
14. Uneven material feed
Trouble
Thread tension
Feed dogs
Presser foot pressure
Differential feed ratio
15-3)
15-4)
15-5)
15-6)
Adjustment of differential feed
14-5)
Thread
Height of feed dogs
14-4)
15-2)
Tilt of feed dogs
14-3)
Needle
Presser foot
14-2)
15-1)
Presser foot pressure
14-1)
Case (1)
6-A) The differential feed ratio has been set
for gathering.
Set it for stretching. When stretching lightweight materials, be careful not to cause the
presser foot to contact unevenly with the materials.
Increase the presser foot pressure.
Eliminate such difference in level.
4-B) A difference in level exists between the
main feed dog and differential feed dog.
5-A) The presser foot pressure is not high
enough, providing poor ironing effect.
Replace the feed dog.
Reduce the both thread tensions to a minimum.
Use a thin thread as far as possible.
Use a thin needle as much as possible.
Provide differential feed suited to the material.
Eliminate the difference in level.
4-A) The leading edge of the feed dog teeth
has been rounded off.
3-A) Both the needle thread and looper
thread tensions are too high.
2-A) The thread used is too thick.
1-A) The needle is too thick.
5-A) The differential feed has been improperly adjusted.
4-A) A different in level exists between the
main feed dog and differential feed dog.
Make the front down. However, be sure to align
the differential feed dog with the main feed dog.
Buff the presser foot sole for good surface finish.
2-B) Scratches on or defective finish on the
presserfoot sole produce friction between the presser foot and materials.
3-A) The front is too high.
Remove the stiffness provided no hinge play is
produced. Replace the presser foot with a new
one.
Reduce the presser foot pressure except for the
uneven material feed due to puckering.
Check and Corrective measures
2-A) The hinge is too stiff.
1-A) The presser foot pressure is too high.
Case (2)
17-1)
The needle cannot be
threaded.
The lever does not move
if it is operated. (It does
not move to the looper
side.)
The pump pressure is
too low. No air flows
inside the pump.
16-2)
16-3)
Thread path pipe
Case (1)
16-1)
to the next page
17. Faulty needle threader
16. The looper thread cannot
be passed.
Trouble
Correct the hook so that it is positioned equidistantly from the right and left needle guide plates. If
this corrective measure cannot be taken, replace
the needle threader with a new one.
Replace the needle threader with a new one.
When the hook is correctly positioned, the lower side of the hook
is aligned with the lower side of the
needle guide plate. If the corrective
measure is hard to be taken, replace
the needle threader with a new one.
1-B) The hook radius has increased. As a result, the thread slips off the hook before
the needle threader enters the needle
eyelet.
1-C) The hook has bent downward and prevents the needle from being passed to
the end.
Correct the deformed part of the lever, or replace it
with a new one.
1-A) The hook has bent and lost its lateral
center. As a result, the needle threader
cannot enter the needle eyelet.
3-A) An extra force is applied to the lever to
deform the sheet metal.
Pull out the tube from the pump. Twist it to correct
the bend.
Take the aforementioned corrective measure.
1-D) The piston lip of the pump is applied
with an excessive amount of grease. As
a result, the grease enters the pipe.
2-B) The air tube has crushed.
Pass a thick thread (cotton thread count of which
is #20 or lower) through the pipe to remove oil.
1-C) The pipe is lubricated due to maloperation.
Apply a small amount of grease to the periphery of
the piston lip. If the piston lip has worn out, replace
it with a new one.
Pull the thread from the looper by hand to check
whether it is caught by any part.
1-B) Scratches inside the pipe
2-A) The pump piston does not move
smoothly.
Remove dust with a threader supplied with the
machine.
Check and Corrective measures
1-A) The pipe is clogged with dust.
Case (2)
0 to 0.1
– 74 –
– 75 –
Area surrounding the
needle bar
Area surrounding the
looper
Area surrounding the
motor
The pulley produces
noise when it is turned.
19-1)
19-2)
19-3)
19-4)
19. Abnormal noise
The thread sliding segment fails move forward.
The needle threader fails
to operate smoothly.
18-1)
17-2)
Case (1)
18. Thread sliding segment
Trouble
4-A) The cams assembled in the main shaft
run out of oil.
3-A) Belt vibration
2-B) The thread sliding segment comes
in contact with the front cover due to
bending of the 2/3 thread changeover
attachment.
Apply oil. If possible, remove the cams from the
main shaft and clean them up and apply grease to
them.
Adjust the belt so that it is properly tensed.
Correct the bent section. If it cannot be corrected,
replace the thread sliding segment with a new
one.
Refer to the pertinent Standard Adjustment.
Refer to the pertinent Standard Adjustment.
1-B) Contact between the needle and the
upper and lower loopers.
2-A) Contact between the lower looper and
the thread sliding segment.
Correct the position of the thread guide. If it has
deformed, correct the thread guide by bending it.
1-A) Contact between the needle clamp
thread guide and the front cover.
Remove dirt from the sliding section.
Remove dust. If the needle threader still fails to
operate smoothly, apply grease to the needle
threader.
2-B) Dust has entered the space between the
cam section of the operating lever and
the base.
1-A) The sliding section is clogged with dirt.
Install the needle threader so that it is in parallel to
the needle bar.
Check and Corrective measures
2-A) The base is not in parallel to the needle
bar.
Case (2)
SEWING MACHINERY BUSINESS UNIT
2-11-1, TSURUMAKI, TAMA-SHI,
TOKYO, 206-8551, JAPAN
PHONE : (81)42-357-2341
FAX : (81)42-357-2345
http://www.juki.com
Copyright C 2013 JUKI CORPORATION.
All rights reserved throughout the world.
*The description covered in this Service Manual, Parts List is subject to change for improvement of the commodity without notice.
000613
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