LU-2810, 2810-7, 2860, 2860-7 INSTRUCTION MANUAL

LU-2810, 2810-7, 2860, 2860-7 INSTRUCTION MANUAL
LU-2810, 2810-7, 2860, 2860-7
INSTRUCTION MANUAL
CONTENTS
BEFORE OPERATION......................................................................................................... 1
1. SPECIFICATIONS........................................................................................................... 2
2. INSTALLATION............................................................................................................... 2
3. ADJUSTING THE BELT TENSION (LU-2810, LU-2860)............................................... 5
4. ATTACHING THE BELT COVER (LU-2810, LU-2860).................................................. 5
5. INSTALLING THE OIL SHIELD...................................................................................... 6
6. PNEUMATIC COMPONENTS (LU-2810-7, LU-2860-7)................................................. 6
7. INSTALLING THE THREAD STAND.............................................................................. 8
8. LUBRICATION................................................................................................................ 9
9. ATTACHING THE NEEDLE.......................................................................................... 11
10. ATTACHING AND REMOVING THE BOBBIN............................................................. 12
11. THREADING THE HOOK............................................................................................. 12
12. INSTALLING THE THREAD GUIDE PIN...................................................................... 13
13. WINDING A BOBBIN.................................................................................................... 13
14. THREADING THE MACHINE HEAD............................................................................ 14
15. ADJUSTING THE STITCH LENGTH............................................................................ 16
16. THREAD TENSION....................................................................................................... 17
17. THREAD TAKE-UP SPRING........................................................................................ 18
18. HAND LIFTER............................................................................................................... 19
19. ADJUSTING THE PRESSURE OF THE PRESSER FOOT......................................... 19
20. NEEDLE-TO-HOOK RELATION................................................................................... 20
21. ADJUSTING THE HOOK NEEDLE GUARD................................................................ 21
22. ADJUSTING THE BOBBIN CASE OPENING LEVER................................................. 22
23. POSITION OF THE COUNTER KNIFE AND ADJUSTMENT OF THE KNIFE
PRESSURE................................................................................................................... 23
24. ADJUSTING THE AMOUNT OF THE ALTERNATING VERTICAL MOVEMENT OF THE
WALKING FOOT AND THE PRESSER FOOT............................................................... 24
25. SEWING SPEED TABLE.............................................................................................. 24
26. RESETTING THE SAFETY CLUTCH........................................................................... 25
27. ADJUSTING THE AUTOMATIC PRESSER FOOT LIFTER......................................... 26
28. FIXING THE FEED ADJUSTING DIAL......................................................................... 27
29. NORMAL-/REVERSE-FEED STITCH NEEDLE ENTRY POINTS ALIGNMENT AT THE
TIME OF AUTOMATIC REVERSE FEED STITCHING (LU-2810-7, LU-2860-7)......... 28
30. OPERATION SWITCHES (LU-2810-7, LU-2860-7)...................................................... 29
31. KNEE SWITCH............................................................................................................. 31
32. MOTOR PULLEY AND V-BELT (LU-2810, LU-2860).................................................. 34
33. TROUBLES IN SEWING AND CORRECTIVE MEASURES........................................ 35
i
BEFORE OPERATION
CAUTION :
Check the following so as to prevent maloperation of and damage to the machine.
• Before you put the machine into operation for the first time after the set-up, clean it thoroughly.
Remove all dust gathering during transportation and oil it well.
• Confirm that voltage has been correctly set.
Confirm that the power plug has been properly connected to the power supply.
• Never use the machine in the state where the voltage type is different from the designated one.
• The direction of normal rotation of the machine is counterclockwise as observed from the pulley side.
Take care not to allow the machine to rotate in the reverse direction.
• Never operate the machine unless the machine head and the oil tank have been filled with oil.
• For a test run, remove the bobbin and the needle thread.
• For the first month, decrease the sewing speed and run the sewing machine at a speed of 80% or less of
the maximum sewing speed. As to the maximum sewing speed, see "25. SEWING SPEED TABLE" p.24.
• Operate the handwheel after the machine has totally stopped.
–1–
1. SPECIFICATIONS
Model
LU-2810 (1-needle)
LU-2810-7
(1-needle with thread
trimmer)
Max. 3,000 sti/min
Sewing speed
LU-2860 (2-needle)
LU-2860-7
(2-needle with thread
trimmer)
Max. 2,700 sti/min
See "25. SEWING SPEED TABLE" p.24.
Stitch length (max.)
Normal feed : 9 mm Reverse feed : 9 mm
Needle
GROZ-BECKERT 135 x 17
(Nm 125 to Nm 180) (Standard : Nm 160)
Thread
#30 to #5 (US : #46 to #138, Europe : 20/3 to 60/3)
Hook
Vertical-axis 2.0-fold capacity hook
Lift of presser foot
Hand lifter lever : 10 mm By knee lifter, Auto-lifter: 20 mm
JUKI New Defrix Oil No.1 or JUKI MACHINE OIL #7
Lubricating oil
Noise
- Equivalent continuous -Equivalent continuous -Equivalent continuous -Equivalent continuous
emission sound
emission sound
emission sound
emission sound
pressure level (LpA) at
pressure level (LpA) at
pressure level (LpA) at
pressure level (LpA) at
the workstation:
the workstation:
the workstation:
the workstation:
A-weighted value of
A-weighted value of
A-weighted value of
A-weighted value of
83.0 dB; (Includes KpA
83.0 dB; (Includes KpA
83.0 dB; (Includes KpA
83.0 dB; (Includes KpA
= 2.5 dB); according to
= 2.5 dB); according to
= 2.5 dB); according to
= 2.5 dB); according to
ISO 10821- C.6.2 - ISO ISO 10821- C.6.2 - ISO ISO 10821- C.6.2 - ISO ISO 10821- C.6.2 - ISO
11204 GR2 at 3,000
11204 GR2 at 3,000
11204 GR2 at 2,700
11204 GR2 at 2,700
sti/min.
sti/min.
sti/min.
sti/min.
-Sound power level
-Sound power level
-Sound power level
-Sound power level
(LWA);
(LWA);
(LWA);
(LWA);
A-weighted value of
A-weighted value of
A-weighted value of
A-weighted value of
88.5 dB; (Includes KWA
88.5 dB; (Includes KWA
88.5 dB; (Includes KWA
88.5 dB; (Includes KWA
= 2.5 dB); according to
= 2.5 dB); according to
= 2.5 dB); according to
= 2.5 dB); according to
ISO 10821- C.6.2 - ISO ISO 10821- C.6.2 - ISO ISO 10821- C.6.2 - ISO ISO 10821- C.6.2 - ISO
3744 GR2 at 3,000 sti/
3744 GR2 at 3,000 sti/
3744 GR2 at 2,700 sti/
3744 GR2 at 2,700 sti/
min.
min.
min.
min.
2. INSTALLATION
1) Carry the sewing machine with two persons.
Do not hold the handwheel.
–2–
2) Do not put protruding articles such as the
screwdriver and the like at the location where
the sewing machine is placed.
3) Attaching the hinge seats and the support rub❶
❷
bers of the machine head
❸
Fix hinge seat ❶ , machine head support rubber
❷ , and spacer (one on the right side) supplied with the machine on the table with nails ❸ ,
as illustrated in the figure.
For the LU-2860, add one more spacer to each
of the right and left sides of the table if the left
bed slide cannot be opened because of interference with the table.
Operator’s side
Align
Table
4) Attaching the oil pan
Fix the oil pan ❹ supplied with the machine on
the table by tightening eight wood screws.
❹
Align
5) Attach a filter ❺ to the oil pan ❹ as shown in
the figure.
❺
❹
–3–
6) Install hinge ❺ on the bed with screw ❻ .
Engage the hinge with the rubber hinge of the
❺
table. Then, place the machine head on the
machine head support rubber.
❻
7) Securely attach head support rod ❼ to the table
until it goes no further.
❼
8) Put reflux pipe ❾ in the oil reservoir of oil pan ❽ .
Secure the pipe in groove .
❽
9) Fix filter and filter clamp with fitting .
❾
10) Mount spacers supplied with the machine
head on the frame.
11) Install bracket on CP panel with screws supplied with the panel.
12) Install bracket on spacer with screws supplied with the machine head and washers supplied with the panel.
Do not use the screws supplied the panel
instead of screws supplied with the machine head.
–4–
3. ADJUSTING THE BELT TENSION (LU-2810, LU-2860)
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.
Adjust the belt tension with the height of the motor
m
m
15
so that the belt sags 15 mm when the center of V
belt is applied with a 9.8 N load.
N
9.8
Handwheel
Motor pulley
4. ATTACHING THE BELT COVER (LU-2810, LU-2860)
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.
❷
V-belt
(Installation procedure)
1) Put the V-belt on the sewing machine pulley.
2) Install belt cover ❶ on the machine arm.
3) Install belt cover B ❷ on the table.
4) Mount the handle section of the pulley with a
screw.
❶
–5–
5. INSTALLING THE OIL SHIELD
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.
LU-2810, LU-2810-7
❷
❶
Install oil shield ❶ , supplied with the unit, on the
frame with screws ❷ .
❷
LU-2860, LU-2860-7
❶
❷
6. PNEUMATIC COMPONENTS (LU-2810-7, LU-2860-7)
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.
(1) Installing the regulator
❺
1) Install regulator (asm.) ❶ on mounting plate
❺ with screw ❷ , spring washer ❸ and nut ❹
❷
which are supplied with the unit.
❸
2) Install couplings ❻ and ❼ on regulator ❶ .
❼
❻
3) Install mounting plate ❺ on the underside of the
❹
table.
4) Connect ø6 air tube coming from the sewing
machine to coupling ❻ .
❶
–6–
(2) Adjusting the air pressure
Decrease
Increase
The operating air pressure is 0.5 to 0.55 MPa.
❶
Adjust the air pressure using air pressure
regulating knob ❶ of the filter regulator.
(3) Exhaust tube
Pass ø8 exhaust tube ❶ coming from the
sewing machine through hole ❷ in the table.
In the case of high humidity, water may flow out
from the exhaust tube.
❶
❷
–7–
7. INSTALLING THE THREAD STAND
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.
Assemble the thread stand, set it up on the machine
table using the installation hole in the table and tighten nut ❶ gently.
LU-2810, LU-2810-7
❶
LU-2860, LU-2860-7
❶
–8–
8. LUBRICATION
WARNING :
1. Do not connect the power plug until the lubrication has been completed so as to prevent accidents
due to abrupt start of the sewing machine.
2. To prevent the occurrence of an inflammation or rash, immediately wash the related portions if oil
adheres to your eyes or other parts of your body.
3. If oil is mistakenly swallowed, diarrhea or vomitting may occur. Put oil in a place where children
cannot reach.
■ Lubrication procedure
Fill the oil tank with oil before operating the sewing
machine.
1) Fill the oil tank with JUKI NEW DEFRIX OIL
C
No.1 (Part No. : MDFRX1600C0) or JUKI
MACHINE OIL #7 (Part No. : MML007600CA)
using the oiler supplied with the machine from
section C.
❶
2) Fill the oil tank with the oil until the top end of
oil amount indicating rod ❷ comes between the
upper engraved marker line A and the lower
A
engraved marker line B of oil amount indicating
window ❶ .
❷
B
If the oil is filled excessively, it will leak from the
air vent hole in the oil tank or proper lubrication
will be not performed. In addition, when the oil
is vigorously filled, it may overflow from the oil
hole. So, be careful.
3) When you operate the sewing machine, refill
oil if the top end of oil amount indicating rod ❷
comes down to the lower engraved marker line
B of oil amount indicating window ❶ .
1.When using a new sewing machine for the first time or using the sewing machine which has not
been used for a long time, run in the sewing machine at a sewing speed of 1,000 sti/min or less and
check the oil quantity in the hook before use. If the quantity of oil in the hook is insufficient, adjust
the quantity of oil by turning the oil quantity adjusting screw counterclockwise to ensure that the
oil quantity in the hook is adequate. After that, adjust the quantity of oil to the adequate one. (Refer
to "■ Adjusting the oil quantity in the hook" p.10.)
2.For the oil for hook lubrication, purchase JUKI NEW DEFRIX OIL No. 1 (Part No. : MDFRX1600C0) or
JUKI MACHINE OIL #7 (Part No. : MML007600CA).
3.Be sure to lubricate clean oil.
–9–
■ Cleaning the oil filter
1) Loosen fastening plate ❶ on the back-flow side.
Remove oil filter joint (asm.) ❷ on the back-flow
side.
2) Clean up filters ❸ , ❹ and ❺ and oil reservoir
❻ of the oil pan.
Be sure to clean up the oil reservoir of the
oil pan and the filter case approximately
once a month.
If the filter is clogged with soil, lubrication
fails resulting in trouble.
❶
❷
❸
❹
❺
❻
■ Adjusting the oil quantity in the hook
LU-2810, LU-2810-7
1) Remove rubber cap ❶ .
2) Loosen nut ❷ and turn oil amount adjustment
screw ❸ to adjust the amount of oil in the hook.
Turning the screw clockwise A will decrease the
amount of oil in the hook or counterclockwise B
A sheet of
paper
will increase it.
3) The appropriate amount of oil, when a sheet of
paper is placed near the periphery of the hook,
❶
is to such an extent that splashes of oil from the
B
hook appear in approximately five seconds as
shown in the figure on the left.
A
❷
❸
❹
❺
D
C
– 10 –
In the case the oil quantity in the hook cannot be adjusted to the proper quantity, it
should be adjusted by loosening nut ❹ and
turning oil quantity adjusting screw ❺ . The
oil quantity in the hook is increased by turning the oil quantity adjusting screw counterclockwise C, or is decreased by turning it
clockwise D.
Also check to be sure that the oil is fed to the
hook at the sewing speed of 1,000 sti/min.
LU-2860, LU-2860-7
1) Loosen nut ❷ and turn oil amount
adjustment screw ❸ to adjust the
amount of oil in the hook.
Turning the screw clockwise A will
decrease the amount of oil in the hook
or counterclockwise B will increase it.
2) The appropriate amount of oil, when
a sheet of paper is placed near the
periphery of the hook, is to such an
extent that splashes of oil from the hook
appear in approximately five seconds
as shown in the figure on the left.
A sheet of
paper
❷
❸
A
B
❹
D
❺
C
In the case the oil quantity in the
hook cannot be adjusted to the
proper quantity, it should be adjusted by loosening nut ❹ and
turning oil quantity adjusting
screw ❺ . The oil quantity in the
hook is increased by turning the
oil quantity adjusting screw counterclockwise C, or is decreased by
turning it clockwise D.
Also check to be sure that the oil
is fed to the hook at the sewing
speed of 1,000 sti/min.
9. ATTACHING THE NEEDLE
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.
LU-2810, LU-2810-7
❷
❶
Long groove
LU-2860, LU-2860-7
❷
Switch "off" the motor.
Use 135x17 needles.
1) Turn the handwheel to bring the needle bar to
the highest position of its stroke.
2) Loosen needle clamp screw ❷ . Hold the needle
so that the long groove on needle ❶ faces directly to the right for the LU-2810 and -2810-7, and
so that the long groove on each the two needles
faces inward for the LU-2860 and -2860-7.
3) Push needle ❶ deep into the needle clamp hole
until it will go no further.
4) Tighten needle clamp screw ❷ firmly.
When replacing the needle, check the clearance provided between the needle and the
blade point of hook. (Refer to "20. NEEDLET O - H O O K R E L AT I O N " p . 2 0 a n d " 2 1 .
ADJUSTING THE HOOK NEEDLE GUARD"
p.21.)
If there is no clearance, the needle and the
hook will be damaged.
❷
❶
❶
Long groove
– 11 –
10. ATTACHING AND REMOVING THE BOBBIN
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.
1) Lift latch ❶ of hook, and take out the bobbin.
2) Put the bobbin into the shaft in the hook correctly and release the latch.
1.Do not make the machine run idle with
the bobbin (bobbin thread). The bobbin
thread is caught in the hook. As a result,
the hook may be damaged.
2.Be careful so as not to get hurt with the
top end of the counter knife.
❶
11. THREADING THE 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.
1) Pass the thread through thread path ❶ in the
hook and thread hole ❷ in the lever, and draw
the thread.
Now, the thread will be brought to thread hole
❷ via the tension spring.
2) Make sure that the bobbin revolves in the direction of the arrow when you draw the thread.
❷
❶
– 12 –
12. INSTALLING THE THREAD GUIDE PIN
Insert needle thread guide pin ❶ into the corresponding hole in top cover ❷ .
LU-2810, LU-2810-7
❷
・LU-2810, LU-2810-7: One needle thread guide pin
・LU-2860, LU-2860-7: Two needle thread guide pins
❶
LU-2860, LU-2860-7
❷
❶
13. WINDING A BOBBIN
❶
1) Pass the thread through sections ❶ to ❹ in the
numerical order.
2) Insert the thread from the rear side of looper
thread clamp ❺ and trim the thread. (The thread
end is retained under the looper thread clamp.)
3) Load a bobbin on bobbin winder shaft ❻ .
4) Lift bobbin winder lever ❼ in the direction of the
arrow.
5) When you start the sewing machine, the bobbin
rotates to automatically wind the thread on itself.
6) When the bobbin is filled up, the bobbin winder
lever automatically releases the bobbin and the
bobbin winder stops running.
❻
❺
❹
❸
❼
❷
❽
– 13 –
1.The bobbin thread winding amount is adjusted by loosening setscrew ❽ . The bobbin thread winding amount is increased
by moving bobbin wider lever ❼ upward.
2.If the thread comes off the thread tension
controller, wind the thread on the intermediate thread guide by one turn.
1.This is the one-touch type bobbin winder. When the bobbin is fully wound with
thread, bobbin thread clamp ❺ automatically returns to the initial position.
2.To stop bobbin winding before the bobbin
is fully wound with thread, turn the handwheel with threading lever ❼ held lightly
depressed to return bobbin thread clamp
❺ to the initial position.
14. THREADING THE MACHINE HEAD
[LU-2810, 2810-7]
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.
❶
❷
❾
❸
❹
❺
❻
❸
❹
❺
❼
❻
❽
❼
LU-2810-7
Thread the machine head following the order
as illustrated in the figure.
* Pass thread through the right side of
thread guide .
LU-2810
– 14 –
[LU-2860, 2860-7]
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.
❶
❶
Left-hand
needle thread
Right-hand
needle thread
❷
❾
❸
❹
❺
❹
❻
❼
❸
❹
❸
❺
❻
❺
❽
LU-2860-7
❻
❼
LU-2860
– 15 –
Thread the machine head following the
order as illustrated in the figure.
15. ADJUSTING THE STITCH LENGTH
❸
❹
❷
Turn standard feed adjusting dial ❶ and 2P feed adjusting dial ❷ to align the desired number with marker dot ❸ on the machine dial.
(1) Reverse feed stitchng
1) Press down reverse feed control lever ❹ .
❸
❶
2) Reverse feed stitches are made as long as you
keep pressing the lever down.
3) Release the lever, and the machine will run in
the normal feed direction.
(2) Manual one-touch reverse feed stitching
1) Press touch-back switch ❺ .
2) Reverse feed stitches are made as long as you
keep pressing the lever down.
3) Release the switch, and the machine will run in
the normal feed direction.
❺
(3) Changing over the stitching pitch (LU-2810-7
and -2860-7)
1) Press stitching pitch changeover switch ❻ to
change over the stitch length to the one corresponding to the scale mark on the 2P feed adjusting dial. (The LED on the switch lights up.)
❻
1.Set 2P feed adjusting dial ❷ at a value
smaller than the value set by standard
feed adjusting dial ❶ .
2.Adjust the 2P feed adjusting dial when
the stitching pitch changeover switch is
placed in OFF.
3.Scale mark on the 2P feed adjusting
dial smaller than 3 (at which the dial is
stopped by the dial stopper) is used for
the 0 (zero) alignment of the 2P dial. Scale
marks smaller than 3 cannot be used.
Refer to "30. OPERATION SWITCHES (LU2810-7, LU-2860-7)" p.29 for the details of
the 2P device.
– 16 –
16. THREAD TENSION
B
B
(1) Adjusting the needle thread tension
A
A
1) Turn thread tension nut No. 1 ❶ clockwise A to
shorten the length of thread remaining on the
❶
top of needle after thread trimming. Turn the nut
❷
counterclockwise B to lengthen it.
2) Turn thread tension nut No. 2 ❷ clockwise A to
increase the needle thread tension, or counterclockwise B to decrease it.
Apply the same tension to both of the
thread tension nut No. 2.
In the case, the length of thread remaining
at the needle tip cannot be increased, replace the spring of tension controller No. 1
with 22945505 which is separately available.
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.
(2) Adjusting the bobbin thread tension
Turn tension adjustment screw ❸ clockwise A to
increase the bobbin thread tension, or counterclockwise B to decrease it.
A
❸
B
– 17 –
17. THREAD TAKE-UP SPRING
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.
(1) When you want to change the stroke of the
thread take-up spring
1) Loosen screw ❷ . Adjust thread take-up spring
❶ by moving it in the slot.
2) Loosen screw ❹ . Adjust thread take-up spring
❸ by moving thread take-up spring adjusting
plate ❺ along thread take-up spring base ❻ .
* The LU-2810 and -2810-7 do not have thread
❹
take-up spring ❸ .
❷
❸
❶
❺
❻
(2) When you want to change the tension of
❾
the thread take-up spring
1) To adjust the tension of thread take-up spring ❶ ,
loosen nut ❼ first. Turn spring shaft ❽ counterclockwise to increase the tension or clockwise
❼
❶
❽
❸
to decrease it.
After the adjustment, fix the stud by tightening
nut ❼ .
2) To change the tension of thread take-up spring
❸ , loosen screw ❾ first. Turn nut counterclockwise to increase the tension or clockwise
to decrease it.
After the adjustment, fix nut by tightening screw
❾.
* The LU-2810 and -2810-7 do not have thread
Decrease
take-up spring ❸ .
Increase
– 18 –
18. HAND LIFTER
To lift the presser foot manually, pull hand lifter ❶ in
the direction of the arrow.
This makes the presser foot rise 10 mm and stay at
that position.
❶
19. ADJUSTING THE PRESSURE 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.
B
Turn presser spring regulating dial ❶ clockwise A to
increase the pressure of the presser foot, or counterclockwise B to decrease it.
A
Be sure to operate the sewing machine with
the pressure of the presser foot minimized
as long as the presser foot securely holds
the material.
❶
– 19 –
20. NEEDLE-TO-HOOK RELATION
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.
❸
❹
❶
2.3 mm
1.5 mm
❷
❺
0.05 to 0.1 mm
1) Adjust the standard feed adjusting dial to "0". (Caution 1)
2) Loosen hook driving shaft set collar clamping screw ❸ , and turn the handwheel counterclockwise to
make the needle bar ascend by 2.3 mm from the lowest position of its stroke.
3) In the state described in 2), align blade point ❶ of the hook with the center of needle ❷ , and tighten
hook driving shaft set collar clamping screw ❸ . At this time, a clearance of 1.5 mm is provided between the blade point of the hook and the top end of the needle eyelet.
4) Loosen setscrews ❹ and ❺ of the hook driving shaft saddle on the top face of the bed. Adjust the clearance between the blade point of the hook and the needle to 0.05 to 0.1 mm by moving the hook driving
shaft saddle to the right or left to change its position. Then, tighten setscrews ❹ and ❺ .
5) Align the largest scale mark of the standard feed adjusting dial with the marker dot on the machine arm.
Check to be sure that the blade point of the hook does not come in contact with the needle.
1.If stitch skipping and thread breakage occur when using elastic thread such as vinylon, adjust the
hook timing with the pitch used for sewing.
2.The operation panel could come in contact with the thread stand when tilting the machine head.
To protect the relevant parts from contact, shift the thread stand to a position at which the thread
stand does not interfere with the control panel.
[Only for the LU-2810-7 and LU-2860-7]
To check the needle bar position as described in the aforementioned 2) [i.e., "...the needle bar ascend
by 2.3 mm from the lowest position of its stroke"], you may use the display of the main shaft rotation
angel under the "machine head adjustment mode" of the SC-922.
Increase the numerical value displayed when the needle bar is in its lowest position of its stroke under
the "machine head adjustment mode" by 25 degrees of an angle, the needle bar goes up by 2.3 mm.
(When the needle bar ascends by 2.3 mm from its lowest position of its stroke, the main shaft rotation
angle is 25 degrees of an angle.)
* In the case of adjusting the needle-to-hook relation under the "machine head adjustment mode", do
not press
switch.
Refer to "II-10. Adjustment of the machine head" in the Instruction Manual for the SC-922 for the machine head adjustment mode.
– 20 –
21. ADJUSTING THE HOOK NEEDLE GUARD
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.
When a hook has been replaced, be sure to check
the position of the hook needle guard.
As the standard position of the hook needle guard,
❹
❶
B
A
❷
from its straight position.
If the state of the hook is not as shown above, fit
hexagon wrench ❹ into ❸ of needle guard adjusting
0.05 to
0.2 mm
a
hook needle guard ❷ must push the side face of
needle ❶ to lean the needle by 0.05 to 0.2 mm away
b
❸
screw and adjust as follows:
1) To bend the hook needle guard in direction a,
turn the needle guard adjusting screw in direction A.
2) To bend the hook needle guard in direction b,
turn the needle guard adjusting screw in direction B.
– 21 –
22. ADJUSTING THE BOBBIN CASE OPENING LEVER
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.
LU-2810, LU-2810-7
❸
❷
1) Turn the handwheel in the normal direction of
rotation to bring bobbin case opening lever ❶ to
the closest position to inner hook ❷ .
2) Turn inner hook ❷ in the direction of the arrow
❹
until stopper ❸ is pressed against the slits in
throat plate ❹ .
3) Loosen bobbin case opening lever crank set-
❶
LU-2810, 2810-7
0.7 to 0.9 mm
LU-2860, 2860-7
0.9 to 1.1 mm
screw ❺ . Adjust the clearance between the
A
bobbin case opening lever and protruding portion A of the bobbin case to 0.7 to 0.9 mm.
LU-2810, 2810-7
Tighten setscrew ❺ while pressing down bobbin
case opening lever crank ❻ .
❺
LU-2860, LU-2860-7
1) Turn the handwheel in the normal direction of
rotation to bring bobbin case opening lever ❶ to
the closest position to inner hook ❷ .
2) Turn inner hook ❷ in the direction of the arrow
until stopper ❸ is pressed against the slits in
❻
throat plate ❹ .
3) Loosen setscrews ❼ of the bobbin case open-
LU-2860, 2860-7
ing lever sleeve. Adjust the clearance provided
between the bobbin case opening lever and
projection A of the bobbin case to 0.9 to 1.1
mm. Tighten setscrews ❼ while pressing bobbin
case opening lever ❶ downward and pressing
the bobbin case holding lever sleeve ❽ upward.
❽
❼
– 22 –
23. POSITION OF THE COUNTER KNIFE AND ADJUSTMENT OF
THE KNIFE PRESSURE
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.
❶
Strike
LU-2810-7: 6 to 7 mm
LU-2860-7: 8 to 9 mm
Strike
1) Move the moving knife by hand to its forward
travel end.
• Adjusting the counter knife
2) Loosen counter knife base setscrews ❶ . Adjust the position of the counter knife so that top
end of the counter knife so that it is spaced 1.2
to 1.5 mm from the end face of the throat plate
Knife pressure
starts to be
developed
in terms of the lateral direction, and so that it is
pressed against the stepped section (surface on
the moving knife shaft side) of hook driving shaft
saddle in terms of the longitudinal direction.
❷
1.2 to 1.5 mm
Then, tighten setscrews ❶ .
• Adjusting the knife pressure
3) Loosen setscrews ❷ in the moving knife.
Turn the handwheel to move the moving knife
and adjust the knife pressure.
As the standard adjustment, the knife pressure
is applied from the time when the distance from
the tip of the moving knife to the tip of the counter knife becomes 6 to 7 mm for the LU-2810-7,
and 8 to 9 mm for the LU-2860-7.
Adjust the knife pressure in the state that
the clamp spring does not come in contact
with the moving knife (the clamp pressure
is not developed).
Be sure to carefully prevent from getting
injured by the moving knife, counter knife,
blade point of the hook, etc.
– 23 –
24. ADJUSTING THE AMOUNT OF THE ALTERNATING VERTICAL
MOVEMENT OF THE WALKING FOOT AND THE PRESSER FOOT
Adjust the amount of the alternating vertical movement of the walking foot and the presser foot us-
❶
ing dial ❶ . Turn the dial clockwise to increase the
amount of the alternating vertical movement of the
walking foot and the presser foot, or counterclockwise to decrease it.
For the standard gauge type machine, the amount of
the alternating vertical movement of the walking foot
and the presser foot has been factory-adjusted to 6.5
mm at the time of shipment.
To cancel the restriction to the amount of the alternating vertical movement of the walking foot and the
presser foot, remove the top cover, loosen setscrews
❷ and shift stopper ❸ to the right.
❸
To release the stopper by means of the
standard gauge, the presser foot may interfere with the walking foot. The presser foot
may also interfere with the needle bar when
a heavy-weight material is used.
Make sure that the presser foot interferes
with neither the walking foot nor the presser
bar before operating the sewing machine.
❷
25. SEWING SPEED TABLE
Operate the sewing machine at a speed equal to or lower than the maximum sewing speed selected from
those shown in the table below according to the sewing conditions.
For the LU-2810-7 and -2860-7, the sewing speed is automatically set according to the amount of the alternating vertical movement of the walking foot and the presser foot.
In the case the stitch length exceeds 7 mm, change the maximum sewing speed referring to "6. Function setting of SC-922" in the Instruction Manual for the SC-922.
Amount of alternate vertical movement
of the walking foot and presser foot
Stitch length : 7 mm or less
Stitch length : More than 7
mm and 9 mm or less
Less than 3 mm
3,000 sti/min *
2,000 sti/min
3.25 mm to less than 4 mm
2,400 sti/min
2,000 sti/min
4.25 mm to less than 5 mm
2,000 sti/min
2,000 sti/min
5.25 mm to less than 9 mm
1,800 sti/min
1,800 sti/min
* For the LU-2860 and -2860-7, the maximum sewing speed is 2,700 sti/min.
– 24 –
26. RESETTING THE SAFETY CLUTCH
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.
❶
The safety clutch functions when an excessive load
is applied to the hook or the other components during sewing. At this time, the hook will never rotate
even if turning the handwheel. When the safety
clutch has functioned, remove the cause and reset
the safety clutch as given in the following procedure.
1) Pressing push button ❶ located on the top
surface of the machine bed, strongly turn the
handwheel in the reverse direction of rotation.
2) The resetting procedure completes when the
handwheel clicks.
Turn the handwheel by hand, and confirm
that push button ❶ has returned.
– 25 –
27. ADJUSTING THE AUTOMATIC PRESSER FOOT LIFTER
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.
1) Turn the power ON. Carry out thread trimming
once. Turn ON the automatic presser lifter.
2) Place a 20 mm spacer ❶ under the presser
foot.
❶
3) Remove rubber cap ❷ from the rear face of the
machine arm. Loosen setscrew ❸ .
4) Turn presser bar lifting arm ❹ in the direction of
the arrow until it will go no further. Then, tighten
setscrew ❸ .
❷
❸
For the standard gauge type machine, the
top end of the walking foot interferes with
the needle bar frame when the auto-lifter is
used in the case the amount of the alternating vertical movement of the walking
foot and the presser foot is set at 2 mm or
smaller and in the case it is set at 7 mm or
more and the reverse-rotation needle-up is
carried out.
To use the machine with the amount of the
alternating vertical movement of the walking foot and the presser foot set at 2 mm or
less, set the lifting amount of the presser
foot by means of the auto-lifter at 17 mm or
less.
❹
– 26 –
28. FIXING THE FEED ADJUSTING DIAL
If the feed adjusting dial moves out of the set position when the automatic reverse feed device is
operated:
1) Remove rubber cap ❶ . Tighten screws ❷ .
❷
❶
To prohibit the adjustment of the feed adjusting
dial:
1) Remove the motor cover or the belt cover.
2) Insert stopper pin ❺ and screw ❻ in tapped
❹
hole ❸ (or holes ❸ and ❹ for the LU-2810-7
and -2860-7) and tighten it.
❺
❸
Stopper pin ❺ and screw ❻ are separately
available.
Part number of stopper pin: TA0440401MO
Part number of screw
: SM8060612TP
❻
– 27 –
29. NORMAL-/REVERSE-FEED STITCH NEEDLE ENTRY POINTS
ALIGNMENT AT THE TIME OF AUTOMATIC REVERSE FEED
STITCHING (LU-2810-7, LU-2860-7)
When the sewing speed or stitch pitch is changed, the normal- and reverse-feed stitch needle entry points
may not be aligned at the time of automatic reverse feed stitching.
In such a case, correct the alignment of needle entry points by changing the ON/OFF timing of the automatic
reverse feed cylinder. If it is difficult to correct the timing of the automatic reverse feed cylinder because of
the large stitch pitch, it is recommended to decrease the reverse feed stitching speed.
Refer to "III-8. Detailed explanation of selection of functions ⑯ Compensation of timing of the solenoid for
reverse feed stitching" in the Instruction Manual for the SC-922 for detail.
Normal- and reverse-feed stitches may need to be adjusted according to the stitch pitch to be used. Refer to
the Engineer's Manual for how to adjust the stitches.
1) How to align needle entry points of the reverse feed stitching with those of the normal feed stitching
Carry out "correction of the timing of the reverse feed stitching" according to the difference between the
needle entry points of the reverse feed stitching and those of the normal feed stitching.
Refer to "III-6. Setting the SC-922 functions" in the Instruction Manual for the SC-922 for how to carry
out the "correction of the timing of the reverse feed stitching".
① ON-timing of the reverse feed
stitching at the beginning of
sewing (Function setting No. 51)
Sewing starting position
Stitch length
is smaller
Decrease the set
value of No. 51.
Stitch length is
smaller
② Correction of the OFF-timing of
the reverse feed stitching at the
beginning of sewing (Function
setting No. 52)
Decrease the set
value of No. 52.
③ Correction of the OFF-timing of
the reverse feed stitching at the
end of sewing (Function setting
No. 53)
Increase the set
value of No. 51.
Stitch length is smaller
Increase the set
value of No. 52.
Stitch length is
smaller
Sewing end
position
Sewing end
position
Decrease the set
value of No. 53.
Increase the set
value of No. 53.
2) Reverse feed stitching speed on the basis of stitch pitch
This speed can be changed using Function setting No. 8.
Default value
Stitch pitch (mm)
Reverse feed stitching speed (sti/min)
Recommended value Recommended value
3 to 6
7 to 8
9
600
500
400
– 28 –
30. OPERATION SWITCHES (LU-2810-7, LU-2860-7)
❶ Alternating vertical movement amount
change-over switch
If this switch is pressed the amount of the
alternating vertical movement of the walking foot
and the presser foot will be maximized. (Lamp
above the switch lights up)
Use this switch when a multilayered portion of
the sewing product is not smoothly fed.
To change over the amount of the alternating
vertical movement of the walking foot and the
presser foot by means of the knee switch,
join the knee switch and the mounting plate,
supplied with the unit, together and fix them on
the table with wood screw.
For the wiring, refer to "31. KNEE SWITCH"
p.31.
❶
❷
❸
❹
❺
❻
❷ Automatic reverse feed stitching cancellation/addition switch
• If this switch is pressed when the following automatic reverse feed stitching has been specified, the
reverse stitching will not take place (for once immediately after it is pressed). (Example 1)
• If this switch is pressed when no automatic reverse feed stitching has been specified, the reverse feed
stitching will take place (once immediately after it is pressed). (Example 2)
(Example 1) In the case where both automatic reverse feed stitching for start and that for end
have been specified :
A
D
A
B
C
D
C
D
If the
switch is pressed before starting
sewing, the automatic reverse feed stitching for
start (between A and B) will not be carried out.
B
A
B
C
If the
switch is pressed during sewing,
the automatic reverse feed stitching for end
(between C and D) will not be carried out.
(Example 2) In the case where neither automatic reverse feed stitching for start nor that for end
have been specified :
A
B
D
If the
switch is pressed before starting
sewing, the automatic reverse feed stitching
for start (between A and B) will be carried out.
C
If the
switch is pressed during sewing, the
automatic reverse feed stitching for end (between C and D) will be carried out.
– 29 –
❸ Needle lifting switch
If this switch is pressed, the machine will travel from the needle-down stop position to the needle-up stop position.
When raising the machine head which has been tilted, do not hold the operation switch to raise it.
❹ 2P switch
Example
・2P feed adjusting dial scale : 6
If this switch is pressed, the stitch length is
changed over to that of the scale on the 2P feed
adjusting dial. (Lamp in the button is lit up.)
Be sure to make the number of 2P feed
adjusting dial less than that of the standard
feed adjusting dial.
・Standard feed adjusting dial scale : 9
・If this switch is pressed, stitch length is changed
over from 9 to 6.
OFF
ON
・If this switch is pressed again, stitch length
returns from 6 to 9.
❺ Needle thread tension changeover switch
When the switch is pressed, the double tension function is selected to increase the needle thread tension. (The lamp above the switch is lit up.)
❻ This is not used for the LU-2810-7 and -2860-7.
– 30 –
31. KNEE SWITCH
(1) Installation of the knee switch
1) Install knee switch mounting plate ❶ on the
❶
underside of the table with wood screw ❷ supplied with the unit.
2) Install knee switch ❸ on the knee switch mounting plate with tapping screw ❹ and washer ❺
❷
supplied with the unit.
3) Connect the knee switch to #4 and #11 pins of
the machine connector 14P which is connected
to CN36 of the machine controller.
❸
❺
Black (No. 11)
(2) Functions of the knee switch
❹
White (No. 4)
14
7
8
1
If knee switch ❸ is pressed, the amount of the alternating vertical movement of the walking foot and
the presser foot will be maximized. (Same with the
performance carried out by pressing the alternating
vertical movement amount change-over switch “
”
on the machine head.)
The knee switch can be used as the presser lifting
switch by setting of the motor. (When the switch is
used as the presser lifting switch, the function as the
alternating vertical movement amount changeover
switch is lost.)
White line
Black line
Cords of knee switch
– 31 –
(3) Function setting of the knee switch
・CP-18
❶
❷
❸
❹
1) Enter the function setting mode referring to "6. Setting of functions of
SC-922, 1)" in the Instruction Manual for the SC-922.
1 2
o P T _
2) Press
switch ❶ or
switch ❷ to call out function setting No.12
(option input/output function selection).
o P T
i
n _ _
3) Press
switch ❸ or
i
v E r T
4) Press
switch ❷ and select display No.i31.
5) Press
switch ❸ or
3 1
switch ❹ and select the item for “in”.
The lamps will be
on alternately.
L
2 4
switch ❹ to select the knee switch
function. Refer to list 1 for the details of the functions.
i
L
3 1
o P T
2 4
6) Press
switch ❷ and fix the function.
i
7) Press
switch ❷ and end the option input.
n
E n d
1 2
o P T _
8) Select “End” item using
9) Press
switch ❶ or
switch ❸ or
switch ❹ .
switch ❷ and return to the function setting
mode.
List 1
Function code
Abbreviation
Functional item
Remarks
5
FL
Presser lifter switch function
Presser output will be ON while the switch is being
pressed.
31
ALFL
Presser lifter alternate switch function
Presser output will be ON or OFF each time the
switch is pressed.
24
vErT
Alternate vertical movement amount Alternate vertical movement amount output will be
conversion alternate switch function
ON or OFF each time the switch is pressed.
25
vSW
Alternate vertical movement amount Alternate vertical movement amount output will be
conversion switch function
ON while the switch is being pressed.
– 32 –
❶
・CP-180
❸
❷
1) Enter the function setting mode referring to "18. FUNCTION SETTING SWITCH, 1)" in the Instruction Manual
for the CP-180.
2) Select function number 12 according to the function
setting method.
3) Select the item of " " by switch ❸ .
4) Select the displayed number "
" by means of switch
❷.
5) Select the knee switch function by switch ❸ . Refer to
list 1 for the details of the functions.
The lamps will be on alternately.
6) Fix the knee switch function by switch ❷ .
7) The above function is fixed by switch ❷ .
8) The option input is ended by switch ❷ .
9) Select the item of "
" by switch ❸ , and return to
the function setting mode.
– 33 –
32. MOTOR PULLEY AND V-BELT (LU-2810, LU-2860)
The M-type belt should be used.
The relation between the motor pulley and belt length and the sewing speed is as shown below.
Sewing speed
Effective diameter
of handwheel
Number
of poles
2,500 sti/min
Φ 76 mm
2
Frequency
Number of
revolutions of motor
Effective diameter of
motor pulley
V-belt size
50 Hz
2,840 rpm
Φ 65 mm
42 inch
60 Hz
3,400 rpm
Φ 55 mm
41 inch
The 3-phase, 400 W, 2P clutch motor (1/2 HP) should be used.
– 34 –
33. TROUBLES IN SEWING AND CORRECTIVE MEASURES
Troubles
1. Thread breakage
(Thread frays or is worn
out.)
Causes
Corrective measures
① Thread path, needle point, hook blade point or
bobbin case resting groove on the throat plate
has sharp edges or burrs.
② Needle thread tension is too high.
③ Bobbin case opening lever provides an
excessive clearance at the bobbin case.
○ Remove the sharp edges or burrs on the blade
point of hook using a fine emery paper. Buff up the
bobbin case resting groove on the throat plate.
○ Decrease the needle thread tension.
○ Decrease the clearance provided between the
bobbin case opening lever and the bobbin.
Refer to "22. ADJUSTING THE BOBBIN CASE
OPENING LEVER" p.22.
○ Refer to "20. NEEDLE-TO-HOOK RELATION"
p.20.
○ Adjust the amount of oil in the hook properly. Refer
to "8. LUBRICATION" p.9.
○ Increase the needle thread tension.
○ Decrease the tension of the spring and increase
the stroke of the spring.
○ Refer to "20. NEEDLE-TO-HOOK RELATION"
p.20.
④ Needle comes in contact with the blade point
of hook.
⑤ Amount of oil in the hook is too small.
(Needle thread trails 2 to
3 cm from the wrong side
of the fabric.)
2. Stitch skipping
⑥ Needle thread tension is too low.
⑦ Thread take-up spring works excessively or
the stroke of the spring is too small.
⑧ Timing between the needle and the hook is
excessively advanced or retarded.
① Timing between the needle and the hook is
excessively advanced or retarded.
② Pressure of the presser foot is too low.
③ The clearance provided between the top end
of the needle eyelet and the blade point of
hook is not correct.
④ Hook needle guard is not functional.
⑤ Improper type of needle is used.
3. Loose stitches
① Bobbin thread does not pass through the
tension spring of the inner hook.
② Thread path has been poorly finished.
○ Refer to "20. NEEDLE-TO-HOOK RELATION"
p.20.
○ Tighten the presser spring regulator.
○ Refer to "20. NEEDLE-TO-HOOK RELATION"
p.20.
○ Refer to "21. ADJUSTING THE HOOK NEEDLE
GUARD" p.21.
○ Replace the needle with one which is thicker than
the current needle by one count.
○ Thread the bobbin thread correctly.
③ Bobbin fails to move smoothly.
④ Bobbin case opening lever provides too much
clearance at the bobbin.
⑤ Bobbin thread tension is too low.
⑥ Bobbin has been wound too tightly.
○ Remove rough parts with a fine emery paper or
buff it up.
○ Replace the bobbin or hook with a new one.
○ Refer to "22. ADJUSTING THE BOBBIN CASE
OPENING LEVER" p.22.
○ Increase the bobbin thread tension.
○ Decrease the tension applied to the bobbin winder.
4. Thread slips off the needle
eyelet simultaneously with
thread trimming.
① Thread tension given by the tension controller
No. 1 is too high.
○ Decrease the thread tension given by the tension
controller No. 1.
5. Thread slips off the
needle eyelet at the start
of sewing.
① Thread tension given by the tension controller
No. 1 is too high.
② Clamp spring has improper shape.
○ Decrease the thread tension given by the tension
controller No. 1.
○ Replace the clamp spring with a new one or
correct the current one.
○ Increase the bobbin thread tension.
③ Bobbin thread tension is too low.
6. Thread is not cut sharply.
① The blades of moving knife and counter knife
have been improperly adjusted.
② The knives have blunt blades.
③ Bobbin thread tension is too low.
○ Refer to "23. POSITION OF THE COUNTER
KNIFE AND ADJUSTMENT OF THE KNIFE
PRESSURE" p.23.
○ Replace the moving knife and counter knife with
new ones, or correct the current ones.
○ Increase the bobbin thread tension.
7. Thread remains uncut
after thread trimming.
(Bobbin thread trimming
failure when stitch length
is comparatively short.)
① Initial position of the moving knife has been
improperly adjusted.
② Bobbin thread tension is too low.
○ Refer to the Engineer’s Manual.
8. Thread breaks at the start
of sewing after thread
trimming.
① The needle thread is caught in the hook.
○ Shorten the length of thread remaining on the
needle after thread trimming.
Refer to "16. THREAD TENSION" p.17.
9. When a heave-weight
material is sewn, the
material warps.
① The feed amount of the top feed is inadequate.
○ Decrease the feed dog height and reduce the
feed amount of the bottom feed. (Refer to the
Engineer's Manual for the adjustment procedure.)
– 35 –
○ Increase the bobbin thread tension.
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