JUKI DDL-555-4 User manual

BE5554T0B0A
Model DDL-555-4
High Speed Single Needle Lockstitch
industrial Sewing Machine Equipped with
Automatic Thread Trimmer
Model DLN-415-4
High Speed Single Needle Feed
Lockstitch Industrial Sewing Machine
Equipped with Automatic Thread Trimmer
Model OLU-450-4
High Speed Single Needle Top and Bottom
Feed Industrial Sewing Machine Equipped
with Automatic Thread Trimmer
Model DLD-432-4
High Speed Single Needle Differential
Feed Lockstitch Industrial Sewing Machine
with Automatic Thread Trimmer
Instruction Book
0
TOKYO JUKI INDUSTRIAL CO..LTD.
From the library of: Superior Sewing Machine & Supply LLC

This INSTRUCTION BOOK is compiled for JUKI models DDL-555-4, DLN-415-4, DLU-450-4
and DLD-432-4 which are equipped with the automatic thread trimmers to their mother models
like DDL-555, DLN-4I5, DLU-450 and DLD-432. Since the basic principle of operation and
adjustment are entirely same as those of mother models, please refer to the separate INSTRUC
TION BOOK prepared for them as well.
Please do not hesitate to contact with our agent in your area or our main business for further
questions or details.
CONTENTS
I. SETTING UPTHE MACHINE I
1. Installation of the machine head 1
Z Motor pulley andbelt 1
3. Installing and adjusting the pedal -
4. Installing the synchronizer 3
5.
Connecting thecords ^
6.
Confirming the operating voltage 5
II. HOW TO OPERATETHE MACHINE 6
1. General instruction 6
2. Lubrication and the amount of oil 6
3. Checking the pedal action 6
4. Howto operate the pedal 6
5.
Adjusting the pedal pressure andstroke 8
6. Automatic counter-back stitching 9
7. Passing the needle thread 10
8. Adjusting the thread tension •0
9. Adjusting the length of thread remaining onthe needle after thread trimming .... II
10. Adjusting the needle stop position after thread trimming 12
11. Sharpening thecounter knife '3
12. Importantnotes '3
13. Howto selectthe presser foot, throat plate, sewing hook and feeddog 14
14. Adjusting the timing of the thread timming cam 14
15.
Adjusting the position of the moving knife 15
16. The floating range of the second thread tension di.sc 17
17.
Changing the moving knife 17
18. Adjusting the bobbin thread presser 18
19. Adjusting the slide shaft 19
20. Howto installand remove the knife installing base 19
III. HOW TO ADJUST THE WIPER 20
1. Adjusting the position of the wiper 20
2. Adjusting the position of the wiper magnet 20
IV. HOW TO USE AND ADJUST THE SWITCH-BACK BUTTON 21
1. Forming the switch-back stitches 21
2. Adjusting the position ofthe switch-back lever 21
3. Adjusting the reverse stitch length 21
V. AUTOMATIC PRESSER FOOTLIFTER, AK-2 22
1. How to operate AK-2 22
2. Adjusting the presser foot stroke 22
VI. SPECIAL'SWITCH TO HOLDTHE NEEDLE ATTHI- TOP POSITION 22
VII.
DIAGRAM SHOWING METHOD OF ASSEMBLING TABLE 23
VIII. DIMENSIONAL DIAGRAMOF THE TABLE (TOP SURFACE) 24
From the library of: Superior Sewing Machine & Supply LLC

I. SETTING UP THE MACHINE
1. Installation of the machine head
Not only the machine head but also the oil reservoir and the bobbin winder are installed on the
table in the same way as that of the general lockstitch machines. Please refer to the separate
Instruction Book for model DDL-555, DLN-415, DLU-450 or DLD-432.
Set up
the spool stand on the machine table
by making use of the installation hole as
shown in the illustration. Do not tighten the
lock nut too much, or the laminated surface
of the table top will be cracked.
Z Motor pulley and belt
The maximum sewingspeed of the DDL-555-4 and, DLN-415-4 is 5,000 s.p.m. and DLU-450-4
and DLD-432-4 is 4,200 s.p.m.
You must use the M-type V-belt
The under mentioned table indicates the maximum sewingspeeds related to the motor pulleys
and the length of belts. The effective diameter of the motor pulley is obtained by deducting
5mm(13/64") from the outer diameter.
Outer
diameter of
motor pulley
Motor pulley
Part No.
Sewing speed
Belt
length
Belt
Part No.
50 Hz
60 Hz
125mm
MTS-P01200A0 5,060 s.p.m.
43"
MTJ-VM004300
115
MTS-POllOOAO 4,630
42"
MTJ-VM004200
105
MTS-POIOOOAO
4,250 5,040 s.p.m.
100
MTS-P00950AO 4,000
95
MTS-P00900A0
3,820
4,540
90
MTS-P00850A0 3,610
4,320
85
MTS-P00800A0
3,390
4,000
41"
MTJ-VM004100
80
MTS-P00750AO 3,160
3,790
75
MTS-P00700A0
3,520
(Note) The center hole on the motor pulley is tapered, and the normal pulleys commercially
available in the market can not be used for these machines.
If the belt is too long, the connecting rod may not work smoothly.
- 1 -
From the library of: Superior Sewing Machine & Supply LLC

3. Installing and adjusting the pedal
Motor regulating lever
ft
1) How to attach the connecting bar
After the motor regulating lever and the
pedal were connected by means of the
connecting bar, adjust the vertical position
of the connecting bar by sliding the con
necting bar positioner.
Connecting
bar posj
tloner
2) How to adjust the pedal angle
You can adjust the pedal angle by chang
ing the effective length of the connecting
bar. Loosen the clamp screw and change
the effective length of the connecting bar.
- 2 -
From the library of: Superior Sewing Machine & Supply LLC

4. Installing the synchronizer
The necessary instruction for installation is indicated on the packing case on both of "MATSU
SHITA" and "HITACHI" motors.
(CAUTIONS)
Magnet
Support
rod
Nylon clamper
Cord \\\ \\ \
Rotor
Stater
Printed circuit board
"MATSUSHITA" motors
Screw the support rod into the threaded hole
located on the right looking from the hand-
wheel side and fix it with a lock nut.
Fix the cord onto the support rod by means
of the nylon clamper so that it does not
contact with the V-belt.
"HITACHI" motors
Be careful not to allow the rotor and the
stater to contact with each other.
The clearance between the printed circuit
board cover and the rotor magnet is I to 2mm.
Pass the cord through the inside of the syn
chronizer cover and fix it with the cord clamp
so that it does not contact with the V-belt.
- 3 -
From the library of: Superior Sewing Machine & Supply LLC