Page 1 HIGH-SPEED 1-NEEDLE LOCKSTITCH MACHINE WITH

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Page 1 HIGH-SPEED 1-NEEDLE LOCKSTITCH MACHINE WITH | Manualzz
 HIGH-SPEED 1-NEEDLE LOCKSTITCH MACHINE
WITH AUTOMATIC THREAD TRIMMER
DDL-5550N-7
DDL-5550-7
INSTRUCTION MANUAL
BEFORE OPERATION
Congratulations on your purchase of a JUKI
sewing machine.
Please read this Instruction Manual carefully before
using the unit in order to get the most out of it
and to enjoy using it for a long time.
OPERATION PRECAUTIONS
1.
2,
Never operate the machine unless its oil pan has been
filled with oil. |
After setting up the machine, check the direction of
motor rotation. To check it, turn the handwheei by
hand to bring the needle down, and turn the power
switch ON while observing the handwheel. {The hand-
wheel should turn counterclockwise as observed from
the handwheel side.)
Run the sewing machine at a speed of 4,000s.p.m. or
less for the first one month.
Confirm that the voltage and phase (single- or 3-phase)
are correct by checking them against the ratings shown
on the motor namepiate.
1. Keep your hands away from the needle when you turn the
power switch ON or while the machine is operating.
. Do not put your fingers into the thread take-up cover while the
machine is operating.
. Be sure to turn the power switch OFF before tilting the
machine head or removing the V belt.
- When an operator leaves from the machine, make sure to turn
off the power,
. During operation, be careful not to allow your or any other
person's head or hands to come close to the handwheel, V belt,
bobbin winder or motor. Also, do not place anything close to
them. Doing so may be dangerous.
6. If your machine is provided with a belt cover, finger guard or
any other protectors, do not operate your machine with any of
them removed,
ло WN
1. INSTALLATION
1)
1. Installing the oil pan
1) The oil pan should rest on the four corners of the
2)
machine table groove.
Fix two rubber seats € on side @ (operator's side)
using nails @ as illustrated above. Fix two cushion
seats @ on side © (hinged side) using a rubber-based
adhesive. Then place oil pan €) on the fixed seats.
1} Fit hinge € into the opening in the machine bed, and
fit the machine head to table rubber hinge @ before
placing the machine head on cushions @ on the four
corners.
2. LUBRICATION
1. Information on lubrication
1) Fill oil pan Y with JUKI New Defrix Oil No. 1 up to
HIGH mark @ .
2) When the oil level lowers below LOW mark O), refill
the oil pan with the specified oil.
3) When you operate the machine after lubrication, you
will see splashing oil through oil sight window @ if
the lubrication is adequate.
4) Note that the amount of the splashing oil is unrelated
to the amount of the lubricating oil.
{Precaution} When you first operate your machine after
setup or after an extended period of disuse,
run your machine at 3,000s.p.m, to 3,500
s,p.m. for about 10 minutes for the purpose
of break-in.
2. Adjusting the amount of oil supplied to the face
plate parts
1) Adjust the amount of oil supplied to the thread take-up
and needle bar crank @ by turning adjust pin @ .
2) The minimum amount of oil is reached when marker
dot Q is brought close to needle bar crank @ by
turning the adjust pin in direction © .
3) The maximum amount of oil is reached when marker
dot Q is brought to the position just opposite from
the needle bar crank by turning the adjust pin in
direction @ .
3. ADJUSTING THE AMOUNT OF OIL (OIL SPLASHES) IN THE HOOK
CD Amount of oil (oil splashes) confirmation paper
Fon
|
Approx. 25 mm
Approx. 70 mm
* Use any paper available regardless of the material.
(Rough paper will do.)
O) Position to confirm the amount of oil (oil splashes)
E Е ;
Е Hook Hook driving shalt front bushing
2 > Bed
- e
3 le
Le]
a.
=
Ty Ne
Oil splashe fi ti a
plashes confirmation paper Oi reserver
Closely fit the paper against the wall of the oil reservoir.
* Place the amount of oil (oil splashes) confirmation paper under
the hook.
If the machine has not been sufficiently warmed up for operation, make the machine run idle for approximately three minutes. (Moderate
intermittent operation)
Place the amount of oil (oil splashes) confirmation paper under the hook while the sewing machine is in operation.
Confirm that the height of the oil surface in the oil reservoir is within the range between “HI" and “LOW.”
Confirmation of the amount of oil should be completed in five seconds. (Check the period of time with a watch.)
e Sample showing the appropriate amount of oil
„” Race surface
—X
Ba
Dr
Appropriate amount of oil {small}
F Г
+ I
E
F I
t 1
f
i
1
i
i
| Approx. 1mm
te ( DDL-5550A-7
DDL-5550NA-7 | 0.5mm)
Race surface
i DDL-5550NH-7
(DDL 3550.7 | mm )
Approx. 2mm
DDL-5550A-7
Appropriate amount of oil (large) DDL-5550NA-7 | mm )
@ Adjusting the amount of oil (oil splashes) in the hook
p=
a
\ O ©
1) Theamountofoil shown inthe samples on the left should be finely
adjusted in accordance with sewing processes. Be careful not to
excessively increase/decrease the amount of oil inthe hook. (Ifthe
amount of oil is too small, the hook will be seized (the hook will
be hot). Ifthe amount of oil is too much, the sewing product may
be stamed with oil.)
2) Confirm the amount of oil (o1l splashes) with three sheets of the
confirmation paper on the premise that the amount of oil (oil
splashes) on the respective three sheets of paper do not change.
1) Tuming the oil amount adjustment screw mounted on the hook
driving shaft front bushing in the *+” direction (in direction O) )
will increase the amount of oil {oil splashes) in the hook, or in the
“_" direction (in direction O) ) will decrease it.
2) Afterthe amount of oil in the hook has been properly adjusted with
the oil amount adjustment screw, make the sewing machine run
idle {or approximately 30 seconds to check the amount of oil (oil
splashes) in the hook.
4. ATTACHING THE NEEDLE
© —
|
©
—
„ее
© — =
f
`
Ts
Y
/
e Turn the motor power OFF before starting to
attach the needle.
A needle of DB x 1 (DA x 1 for DDL-5550A-7, -5550NA-7) should
be used. Select a proper needle size according to the count
of thread and the type of material used.
1) Turn the handwheel until the needle bar reaches the
highest point of its stroke.
2) Loosen screw @, and hold needle @ with its
indented part @ facing exactly to the right in
direction
3) Insert the needle in the direction of the arrow until
it will go no further.
4) Securely tighten screw @ .
5) Check that long groove @ of the needle is facing
exactly to the left in direction @ .
5. SETTING THE BOBBIN INTO THE BOBBIN CASE
1) Hold the bobbin in a way that the thread open end is
directed to the right as observed from you, and set the
bobbin into the bobbin case.
2) Pass the thread through thread slit @ , and pull the
thread in direction @ . By so doing, the thread will
pass under the tension spring and come out from notch
3) Check that the bobbin rotates in the direction of the
arrow when thread (9 is pulled.
m
Turn stitch length dial @# in the direction of the
arrow, and align the desired number to marker dot @
on the machine arm.
The dial calibration is in millimeters.
When you want to decrease the stitch length, turn stitch
length dial @ while pressing feed lever @ in the
direction of the arrow.
Assemble the thread stand unit, and insert it in the hole
in the machine table.
Tighten locknut € to fix the thread stand.
For ceiling wiring, pass the power cord through spool
restrod @ .
9. INSTALLING THE BELT COVER AND THE BOBBIN WINDER
— À
| 63.5 _
75.5
(unit: mm)
How to install the belt cover and the bobbin winder
1. Installation procedure
1)
2)
3)
4)
5)
6)
7
8)
Drill four guiding holes Q, O, ® and for wooden
screws in the table.
Install belt cover support € in the tapped hole in the arm.
Pass the handwhee! through the hole in belt cover A_ 6,
then set the handwheel on the arm, At this time, you can
smoothly install the handwheel diagonally from the rear of
the handwheel by tilting belt cover À @ as illustrated in
the figure, |
Place belt cover B @ on guiding holes O and O).
Fix belt cover A @ on the arm using screws & , @ and
washer {§. At this time, tighten screw @ with a tightening
torque of 30 kgf/cm and screw @ with a tightening torque
of 25 kgf/cm. If you tighten further these screws, the
securing state of the belt cover will not change.
Fit cat € to the belt cover A.
Move belt cover B @ backward until the rubber
section of belt cover B @ comes in contact with belt cover
A €). Then, further move the belt cover B in the same
direction by 0.5 to | mm. Now, fix the belt cover B in
position using wooden screw and washer.
Fix bobbin winder @ in guiding holes @) and & using
wooden screws and washers,
10. ADJUSTING THE HEIGHT OF THE KNEE LIFTER
W
Ji
mi
1)
2)
3)
The standard height of the presser foot lifted using the
knee lifter is 10 mm.
You can adjust the presser foot lift up to 13 mm using
knee lifter adjust screw @ . (The max. lift should be
9 mm for the A type.)
When you have adjusted the presser foot lift to over
10 mm, be sure that the bottom end of needle bar €
in its lowest position does not hit presser foot € .
e The machine will completely perform thread trimming
even if you reset the pedal to its neutral position
immediately after the machine started thread trimming
action.
® When the machine stops with its needle down, and if you
want to bring the needle up, depress the back part of
the pedal once, —
5
1.
1)
2)
3)
4)
The pedal is operated in the following four steps:
The machine runs at low sewing speed when you lightly
+ depress the front part of the pedal.
The machine runs at high sewing speed when you further
depress the front part of the pedal. & (If the automatic
reverse feed stitching has been preset, the machine runs
at high speed after it completes reverse feed stitching.)
The machine stops (with its needle up or down) when
you reset the pedal to its original position. €
The machine trims threads when you fully depress the
back part of the pedal. @
If your machine is provided with the Auto-lifter (AK-853,
an addition step is given between the machine stop and
thread trimming step.
The presser foot goes up when you lightly depress the
back part of the pedal , and if you further depress the
back part, the thread trimmer is actuated.
If you reset the pedal to its neutral position during the
automatic reverse feed stitching at seam start, the
machine stops after it completes the reverse feed stitching.
The machine will perform normal thread trimming even if
you depress the back part of the pedal immediately
following high or low speed sewing.
12. THREAD TENSION
1. Adjusting the needle thread tension
1) As you turn thread tension No. | nut @ clockwise (in
direction @ ), the thread remaining on the needle after
thread trimming will be shorter,
2) As you turn nut @ counterclockwise (in direction
© ), the thread length will be longer,
3) As you tum thread tension No. 2 nut @ clockwise (in
direction @® ), the needle thread tension will be
increased.
4) As you turn nut @ counterclockwise (in direction
@ ), the needle thread tension will be decreased.
2, Adjusting the bobbin thread tension
1) As you turn tension adjust screw @ clockwise (in
direction @ ), the bobbin thread tension will be
increased.
2) As you turn screw @ counterclockwise (in direction
@ ), the bobbin thread tension will be decreased.
1. Changing the stroke of thread take-up spring €
1) Loosen setscrew @ .
2) As you turn tension post € clockwise (in direction
O ), the stroke of the thread take-up spring will be
increased.
3) As you turn the knob counterclockwise (in direction
© ), the stroke will be decreased.
2. Changing the pressure of thread take-up spring @
1) Loosen setscrew @ , and remove tension post @ .
2) Loosen setscrew
3) As you turn tension post €@ clockwise (in direction
O) ), the pressure will be increased.
4) As you turn the post counterclockwise (in direction
O) ), the pressure will be decreased.
1} To stop the machine with its presser foot up, turn hand
lifter @ in direction @ .
2) The presser foot will go up about 5.5 mm (4 mm for A type) and
stop.
3) The presser foot will go back to its original position
when hand lifter is turned down in direction
4) Using the knee lifter, you can get the standard presser foot lift of
about 10 mm and the maximum lift of about 13 mm (max. 9 mm
for A type).
a
Hi,
1) Loosen nut @ . As you turn presser spring regulator @
clockwise (in direction €) ), the presser foot pressure
will be increased.
2) As you turn the presser spring regulator counter-
clockwise (in direction O), the pressure will be
decreased.
3) After adjustment, tighten nut @ .
4) For general fabrics, the standard height of the presser spring
regulator is 29 to 32 mm (Skg) (7 kg for DDL-5550H-7, and
-5550NH-7)
16. ADJUSTING THE FEED TIMING
{Standard feed timing)
Needie
EE ¢ Throat
Feed dog piate
{Advanced feed timing)
t
ME
(Delayed feed timing)
1) To obtain the standard feed timing, align setscrew @
on feed eccentric cam € with setscrew @ on main
shaft thrust collar @ .
2) To make adjustment, loosen two setscrews @ to release
the feed eccentric cam, properly position the eccentric
cam. Then retighten the setscrews.
3) To advance the feed timing in order to prevent uneven
material feed, move the feed eccentric cam in the
direction of the arrow.
4) To delay the feed timing in order to increase stitch
tightness, move the feed eccentric cam in the opposite
direction from the arrow.
5) Be careful not to move the feed eccentric cam too far,
or else needle breakage may result,
@ Frontup @ Standard @ Frontdown @ Throat plate
1) The standard tilt (horizontal) of the feed dog is obtained
when marker dot @) on the feed bar shaft is aligned with
marker dot O) on feed rocker O.
(The standard tilt for DDL-5550H-7, 5550NH-7 of the feed
dog is obtained when marker dot @ is aligned with
center of feed rocker shaft.)
2) To tilt the feed dog with its front up in order to prevent
puckering, loosen the setscrew, and turn the fecd bar shaft
90 degrees in the direction of the arrow, using a
screwdriver,
3) To tilt the feed dog with its front down in order to prevent
uneven material feed, turn the feed bar shaft 90 degrees in
the opposite direction from the arrow.
(The standard tilt for DDL-5550H-7, NH-7)
(Precaution) Whenever the feed dog tilt is adjusted, the feed
dog height will be changed. So, it Is necessary
to check the feed dog height after tilt
adjustment.
18. HEIGHT OF THE FEED DOG
DDL-5550-7
DDL-5550N-7
e
DDL-5550A-7
DDL-5550NA-7 0.7-0.8m™
o
0.75 ~ 0.85 mm
O Feed dog Pp Throat plate
1) The feed dog is factory-adjusted so that it just out from the
throat plate surface 0.75 to 0.85 mm (1.15 to 1.25 mm
for DDL-5550H-7, 5550NH-7, 0.7 to 0.8 mm for DDL-
5550A-7, DDL-SSS0NA-7).
2) If the feed dog just out too much, puckering may resulit
when sewing light-weight materials.(Recommended
protrusion: 0.7 to 0,8 mm)
3) To adjust the height of the feed dog:
(D Loosen screw @ of crank @ .
2 Move the feed bar up or down to make adjustment.
Securely tighten screw @ .
19. NEEDLE-TO-HOOK RELATIONSHIP
\
1. Adjust the timing between the needle and the
hook as follows:
1) Turn the handwheel to bright the needle bar down to
the lowest point of its stroke, and loosen setscrew @& .
(Adjusting the needle bar height)
2) (For a DB needle) Align marker line @ on needle bar
© with the bottom end of needle bar lower bushing
O , then tighten setscrew @ .
{For a DA needle} Align marker line (9 on needle bar
@ with the bottom end of needle bar lower bushing
6 , then tighten setscrew @ .
(Adjusting position @ of the hook)
3) (ForaDB needie) Loosen the three hook setscrews,
turn the handwheel, and align marker line © on
ascending needle bar @ with the bottom end of needle
bar lower bushing @ .
{For a DA needle) Loosen the three hook setscrews,
turn the handwheel, and align marker line on
ascending needle bar € with the bottom end of needle
bar lower bushing @ .
4) After making the adjustments mentioned in the above
steps, align hook blade point @ with the center of
needie € . Provide a clearance of 0.04 mm to 0.1 mm
between the needle and the hook, then securely tighten
the hook setscrews.
* When replacing the hook, specify Its part No. 11141355
(11092251 for DDL-5550H-7 and DDL-5550NH-7).
(Align marker line with the
bottom end of needle bar lower
bushing (Standard)
20. ADJUSTING THE HEIGHT OF THE PRESSER BAR
1) Loosen setscrew € , and adjust the presser bar height
or the angle of the presser foot.
2) After adjustment, securely tighten the setscrew,
DDL-5550H-7, DDL-5550NH-7 DDL-5550-7, DDL-5550A-7, DDL-5550N-7, DDL-5550NA-7
1. When the knife sharpness has deteriorated, resharpen counter knife @ asillustratedin @, and properly reinstall it,
1) If the mounting position of the counter knife is moved in direction €) from the standard mounting position, the thread
length after thread trimming will be increased accordingly.
2) If the mounting position is moved in direction , the thread length will be decreased accordingly.
O Moving knife
0 Center of needle
© Standard : 4.0 mm (DDL-5550-7, DDL-5550A-7, DDL-5550N-7, DDL-5550NA-7)
Standard : 4.5 mm
— 8 —
22. ADJUSTING THE THREAD TAKE-UP STROKE
1} When sewing heavy-weight materials, move thread guide
@ to the left (in direction Q ) to increase the length
of thread pulled out by the thread take-up.
2) When sewing light-weight materials, move thread guide
@ to the right (in direction O) to decrease the length
of thread pulled out by the thread take-up.
3) Normally, thread guide €® is positioned in a way that
marker line @ is aligned with the center of the screw.
1. Stop position after thread trimming
1) The standard needle stop position is obtained by aligning
red marker dot @ on the machine arm with white
marker dot (& on the handwheel.
2) Stop the needle in its highest position, loosen screw ®
to perform adjustment within the slot of the screw.
(D) The needle stop timing is advanced if you move the
screw in direction
@ The needle stop timing is delayed if you move the
screw in direction @® .
{Precaution} Do not operate the machine with screw €
loosened. Just loosen the screw, and do not remove it.
1. Lower stop position
1) The lower needle stop position when the pedal is
returned to the neutral position after the front part
of the pedal is depressed can be adjusted as follows:
Stop needle 6 in its lowest position, loosen screw
@ , and make adjustment within the slot of the screw.
Moving the screw in direction €) advances the needle
stop timing, Moving the screw in direction @ delays
the timing,
(Precaution) Do not operate the machine with screw €
loosened. Just loosen the screw, and do not remove it.
24. PEDAL PRESSURE AND PEDAL STROKE
3
|
(TC
0
=
/S 1
© |
an
|
KT 17
=
7
1. Adjusting the pressure required to depress the
front part of the pedal
1) This pressure can be changed by altering the mounting
position of pedaling pressure adjust spring @ .
2) The pressure decreases when you hook the spring on the
left side.
3) The pressure increases when you hook the spring on the
right side.
2. Adjusting the pressure required to depress the
back part of the pedal
1) This pressure can be adjusted using regulator screw @ .
2) The pressure increases as you turn the regulator screw in.
3) The pressure decreases as you turn the screw out.
3. Adjusting the pedal stroke
1) The pedal stroke decreases when you insert connecting
rod € into the left hole.
25. ADJUSTMENT OF THE PEDAL
1. Installing the connecting rod
1) Move pedal @ to the right or left as illustrated by
the arrows so that motor control lever €P and
connecting rod @ are straightened.
2. Adjusting the pedal angle
I) The pedal tilt can be freely adjusted by changing the
length of the connecting rod.
2) Loosen adjust screw @& , and adjust the length of
connectingrod @ .
26. ONE-TOUCH TYPE REVERSE FEED STITCHING MECHANISM
1. How to operate
1) The moment switch lever @ is pressed, the machine
performs reverse feed stitching,
2) The machine performs reverse feed stitching as long as
the switch lever is held depressed.
3) The machine resumes normal feed stitching the moment
the switch lever is released.
2. Height of the switch lever
1) Adjust the height of switch lever @ so that it can be
easily operated.
2) Loosen screw @ , and move the switch lever up or
down to adjust its height.
— 10 —
27. WIPER (DDL-5550-7, DDL-5550A-7, DDL-5550H-7, DDL-5550N-7,
DDL-5550NA-7, DDL-5550NH-7)
1. Positioning the wiper
Adjust the position of the wiper according to the
thickness of the material sewn. The adjustment procedure
is as follows:
1} Turn the handwheel in the normal direction of rotation
to align white marker dot € on the handwheel with
red marker dot @ on the machine arm.
2) Adjust the distance between the flat part of the wiper
and the center of the needle to 1 mm.
Tighten wiper adjust screw € so that the wiper is
pressed and fixed by wiper collar @ .
3) When the wiper is unnecessary, turn wiper switch @
OFF
28. SPECIFICATIONS
DDL-5550-7 DDL-5550A-7 DDL-5550H-7
DDL-5550N-7 DDL-5550NA-7 DDL-5550NH-7
Application General fabrics, Hght- General fabrics and light- Medium-weight materials
weight materials and weight marertals and heavy-weight
medium-weight materHas materials
Sewing speed Max. 5,000 s.p.m, Max. 4,000 s.p.m. Max. 4,000 s.p.m.
Stitch length Max, 4 mm Max, 5 mm
Needle DB x 1 #9 ~ 18 DAX #9 ~ 11 DB x 1420-23
Presser foot lift (by knee lifter) | 10mm (standard) 13mm(max.) 9 mm (max) 10mm (standard) I3mmémax,)
Lubricating oil
Juki New Defrix Oil No. 1
— 11 —
To order or for further information, please contact :
JUKI CORPORATION
HEAD OFFICE
8-2-1 KOKURYO-CHO,
CHOFU-CITY, TOKYO 182. JAPAN
BUSINESS OFFICE
1-23-83 KABUKI-CHO Please do not hesitate to coniact cur distributors or agents in your area for further information when necessary.
SHINJUKU-KU, TOKYO 160. JAPAN * The description covered in this instruction manual is subject to change for improvement of the
PHONE - 03132051188. 1189. 1190 commodity without notice.
FAX : 03(3203)8260. (32059131
TELEX : J22967, 232-2301
1993, 7 Printed in Japan (T)

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