JUKI DDL 552 User manual

MODEL
DDL-552 -553
-555
HIGH SPEED SINGLE NEEDLE,
LOCK STITCH
INDUSTRIAL SEWING MACHINE
Instruction Book
TOKYO JUKI INDUSTRIAL CO.ITD
From the library of: Superior Sewing Machine & Supply LLC

We thank you for purchasing JUKI Model DDL-552-553-555, high speed, single needle,
lockstitch industrial sewing machines.
DDL-SS2 is best suited for sewing general fabric; DDL-S53 is designed and constructed
for sewing heavy weight materials and DDL-555 is equipped with reverse feed mechanism
for a wide area of usage such as sewing men's shirts, blouses
and other general garments.
The thread take-up, sewing
hook, feed mechanism, etc. are all specially designed and
constructed for high speed sewing. Therefore, at high speed sewing, the running sound is
nominal and the stitching condition is superb.
Before operating these machines, please read this INSTRUCTION BOOK carefully
and thoroughly digest the functions of these efficient machines and enjoy everlasting
pleasure of using these machines.
SPECIFICATIONS
DDL-552
DDL-553
DDL-555
Sewing type
Single needle lock stitch
Usage
General fabric
Medium heavy
weight material
Medium heavy and
heavy weight
material
General fabric
Medium heavy weight
material
Sewing speed
Up to 5,500 s.p.m.
Normal speed:
5,000 s.p.m.
Up to 4,300 s.p.m. Up to
5,500 s.p.m.
Normal speed:
5,000 s.p.m.
Thread
take-up
Link-type thread take-up
Sewing
hook
Automatic lubricating rotary hook Dia. of hook shaft 7.94 <l>
Needles
DBxl #11-18
DBx257 #14-22
DBxl #11-18
Feed
amount
Max. 6 s.p.i. Max. 5.5 s.p.i.
0-4 mm(5/32")
Stitch
adjuster
Push-button system Dial system
Reverse
sewing
None None Lever system
Lubrication Completely automatic lubrication (Rotating volute pump)
Lubricating
oil
New Defrix Oil No. 1
Table
JS type
From the library of: Superior Sewing Machine & Supply LLC

TABLE OF CONTENTS
(DDL-552-553-555)
Page
Installingthe oil reservoir 2
MotorpuUey and the belt 2
Cautions on operating the machine 3
Lubrication 3
1. Adjusting theoil supply to the face part 4
2. The oU adjusting pin 4
3. Adjusting theoil supply to thehook components 4
Threading the machine 5
Preparation
of the bobbin thread 6
Inserting & removing the bobbin case 6
Windingthe bobbin thread 6
How to insert the bobbin 6
The thread tension 7
Adjusting the needle thread tension 7
Thread take-up spring 7
Adjusting the bobbin thread tension 7
Presserfoot and feed dog 8
Adjusting the pressure of the presser foot 8
The presser foot hand lifter 8
Height of the feed dog 8
The stitch length 9
Adjusting the stitch length (DDL-552-553) 9
Adjusting the stitch length (DDL-555) 9
Reverse sewing (DDL-555) 9
Inserting the needle
Installing and removing the sewing hook
Relation between thehookandtlie needle
Adjusting the height of the presser bar
Adjusting the amount ofthe thread take-up.
Adjusting the pressing pressure of the feed lever (DDL-555) 12
(Note)
Due to improvements on the machine, some parts of the operational procedures
of this INSTRUCTION BOOK might be changed without notice.
- 1 -
From the library of: Superior Sewing Machine & Supply LLC

INSTALLING THE OIL RESERVOIR
Rubber cushion
Oil reservoir
Operator side
Hinge side
As shown in the flgure, set the reservoir in
such a way so that the 4 comers of the grooV'
ed part of the table will be supporting the
reservoir.
1. Nail in the 2 rubber cushions in front to
the protruding part of the table.
2. Place the oil reservoir on the protruding
part of the table.
MOTOR PULLEY AND THE BELT
V-belt
Motor pulley
Model DDL-552 can sew at a high speed of
up to 5,500 s.p.m., DDL-553 at a high speed
of up to 4,300 s.p.m. and DDL-555 at a speed
of up to 5,500 s.p.m. For all of above models,
use a 3-phase 400 W(l/2 HP) clutch motor
when connected directly to the power source.
Use a M type V-belt. The relation between
the number of rotation of the machine with
the dimension of the motor pulley is shown in
the table. (Effective diameter)
* The effective diameter of the motor pulley
means the diameter as measured from the
center of the V-belt when the belt is wound
around the machine.
Model
Cycle
No. of rotation
of machine
Part No. of
motor pulley
Effective diameter
of motor pulley
DDL-552
DDL-555
50
5.060 s.p.m.
4,630 s.p.m.
MTK-PVl 20000
MTK-POllOOOO
120mm(4-47/64")
110mm(4-5/16")
60
5,040 s.p.m.
4,540 s.p.m.
MTK-PVl 00000
MTK-PV090000
100mm(3-15/16")
90mm(3-3/4")
DDL-553
50
4,250 s.p.m.
3,850 s.p.m.
MTK-PVl 00000
MTK-PV090000
100mm(3-15/16")
90mm(3-35/64")
60
4,320 s.p.m.
3,790 s.p.m.
MTK-P0085000
MTK-P0075000
85mm(3-ll/32")
75mm(2-61/64")
- 2 -
From the library of: Superior Sewing Machine & Supply LLC

CAUTIONS ON OPERATING THE MACHINE
1 Do not run the machine, under any circumstances, before theoil reservoir is filled up
with fresh oil.
2. Always rotate the machine toward the operator. Do not run the machine in the re
verse direction.
3. Although the machines can attain a maximum speed, for the first month drop the speed
to normal speed and for DDL-552 operate at a normal speed of 4,500 s.p.m., for
DDL-553 at 3,800 s.p.m. and for DDL-555 at 4,500 s.p.m. After that, run the machines
at an appropriate speed depending on the nature of work and the capability of the
operator.
LUBRICATION
HIGH mark
Oil reservoir
LOW mark
Before operating the machine
1. Fill up the oil reservoir with JUKI New
Defrix Oil No. 1 up to the mark "HIGH".
2. Watch and see that the oil level does not
go below the "LOW" mark.
Oil sight window
3. Under normal conditions, when the machine
is run after it is filled up with oil, the
oil will spurt against the oil sight window.
(Caution)
1) When the oil gets dirty, change it with new,
fresh oil.
If the oil plug of the reservoir is
removed, oil will come out.
2) When the machine is to be run for the first
time or when it was idle for a great length
of time, run the machine at 3,000-3,500
s.p.m. for about 10 minutes and allow the
machine to get well-oiled.
3) When
the machine is to be run constantly
at less than 3,500 s.p.m. adjust so that the
oil supply to various parts be increased.
IDOL-SSS H
•mtrm ntTffI
- 3 -
From the library of: Superior Sewing Machine & Supply LLC

Oil adjusting
pin
Oil amount
gets less
Crank
II• •• '' 1^
Oil amount gets more
n I I II If 11
Needle bar crank
Groove of eccentric
"Oil adjusting pin
Arm shaft
^ Oil adjusting pin screw
Counterweight
Z\
Oil regulating valve
1. Adjusting the oil supply to the face
part
When adjusting the oil supply to the thread
take-up and needle bar crank components,
remove the face plate and the oil preventing
plate and adjust by turning the oil adjusting
pin at the tip of the main shaft
1. When the red mark of the adjusting pin
comes near the crank, the oil amount gets
less.
2. When the red mark comes to the opposite
side of the crank, the oil amount gets more.
(Caution)
The oil amount does not change Immediately
after the adjustment, so when adjusting, have
this in miiid.
2. The oil adjusting pin
1.
2.
The oil adjusting pin has a carved groove
as shown in the figure. When this groove
and the oil hole of the main shaft come
together, the oil amount gets more.
When the groove is at the oppositesideof
the oil hole, the oil amount gets less.
The red mark on the oil adjuster shows the
side without the carved groove.
3. Adjusting the oil supply to the hook
components
The supply of oil to the hook components
can be adjusted by
the oil regulating valve on
the hook shaft.
1. If this valve is turned toward0 side(right),
the oil amount gets more.
2. If this valve is turned to0 side(left), the
amount gets less.
- 4 -
From the library of: Superior Sewing Machine & Supply LLC

THREADING THE MACHINE
Rotate the hand wheel to right and place the thread take-up to the highest position.
1. Pass the needle thread in the order shown by the flgure.
2. Pass the thread to the needle eye from left to right.
3. Pull out about 10 cni(4") of the thread from the needle eye.
(U)
- 5 ~
From the library of: Superior Sewing Machine & Supply LLC

PREPARATION OF THE BOBBIN THREAD
Bobbin case
Trip latch
Hook
Tension disc
base
Adjusting screw
— ^ Thread hole
Hfii\
f(l!r
Thread
passinghole
Inserting &removing the bobbin case
1. Rotate the hand wheel with your hand and
bring the needle to its highest position.
2. Tilt the machine and support it by tlie head
support on the table.
3. Lift up the knob of the bobbin case and
take it out.
* If you hold the knob in open condition,
bobbin will not fall off.
4. To insert the bobbin case, insert it deep
into the shaft of tlie hook so that the nose
of the bobbin case fully enters the groove
of the hook and then close the knob.
Winding the bobbin thread
1. Set the bobbin winder to the table with
screws.
2. Pass the thread in the order shown in the
figure and wind it around the bobbin
several times.
3. Knock down the trip latch and contact the
pulley to the belt
4. Adjust the winding amount by the winding
adjustingscrewso that about 80%iswound.
5. When the thread is wound unevenly, move
the thread tension disc base to left and
correct to even winding condition.
6. When the winding is completed, the trip
latch will be released and the pulley will
stop automatically.
How to insert the bobbin
1. Hold the bobbin and insert it to the bobbin
case so that the thread will be in ri^t-twist
condition.
2. Pass the thread to the thread passing hole
of the bobbin case.
3. Then pull the thread and it will pass under
the thread tension spring and can be pulled
out through the thread hole.
- 6 -
From the library of: Superior Sewing Machine & Supply LLC

THE THREAD TENSION
Weaker
Stronger
Adjusting the needle thread tension
Ideal stitches are formed when the needle
thread and the bobbin thread are perfectly
interlocked at the center of the cloth.
The tension of the needle thread is adjusted
by the thread tension nut.
1. Turn it to right to make the tensionstronger
and to the left to make it weaker.
Thread take-up spring
* To change the moving range of the thread
tension spring:
1. Loosen the screw of the thread tension
bracket.
2. Rotate the thread tension bar.
» To change the strength of the thread take-
up spring.
1. Loosen the set screw, remove the thread
tension bar.
2. Loosen the thread tension bar set screw
and adjust.
3. When the thread tension bar is turned to
right, the spring will get stronger and if
turned to left, it will get weaker.
Thread tension
bar set screw
'-'Thread tension nut
Ehread take-up springy
Movingrange
(Tl^ad tension bar bracket
set screw , / /
Adjusting screw
Thread take-up spring
Adjusting the bobbin thread tension
Rotate the thread tension screw of the bobbin
case to adjust the bobbin thread tension.
1. Rotate it to right to make the bobbin
thread tension stronger and to left to make
it weaker.
_ 7 -
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PRESSER FOOT AND FEED DOG
Pressure adjusting
screw
Nut —
0
Hand hfter
Hill "
JUKI
N!|^
Feed driving fork
~T7=
Clamp screw*"
lU
Adjusting the pressure of the presser foot
1. Turn the pressure adjusting screw to right
to make the pressure stronger.
2. Turn this screw to left to make the pressure
weaker.
Normal pressure for general fabric is about
5 kg (11 lbs).
3. After adjustment, firmly tighten the nut.
The presser foot hand lifter
To stop the presser foot at the lifted position:
1. Rotate the hand lifter in the rear of the face
part either to right or left.
2. The presser foot will go up about 5 mm
(13/64") and stops.
3. To lower the presser foot, activate the knee
lifter
once and the presser foot will come
down to the original position.
4. With the knee lifter, the presser foot will
go up about 10 mm (25/64")
Height of the feed dog
The height of the feed dog from the surface of
the throat plate is set from0.7-0.8mm(l/32").
In sewing light weight materials, if this height is
too high, shrink-stitching may result.
To adjust the height of the feed dog:
1. Loosen the clamping screw of the feed driv
ing fork of the compound feed.
2. Move the feed dog base up and down and
adjust
3. After adjusting, tightly tighten the clamping
screw. 0.7~0.8om
- 8 -
Feed dog Throat plate
From the library of: Superior Sewing Machine & Supply LLC