JUKI DU-1281-7 Instruction Manual
DU-1281-7
INSTRUCTION MANUAL
CONTENTS
1. SPECIFICATIONS .......................................................................................................... 1
2. PREPARATION BEFORE OPERATION
2-1. Installing the knee lifter....................................................................................................................................... 2
2-2. Installing the waste oil receiver.......................................................................................................................... 2
2-3. Lubrication ........................................................................................................................................................... 3
2-4. Oiling state ........................................................................................................................................................... 3
2-5. Adjusting the amount of oil in the hook.................................................................................................................. 3
2-6. Adjusting the oil in the pump ............................................................................................................................. 4
2-7. Installing the synchronizer ................................................................................................................................. 4
2-8. Installing the belt cover and the bobbin winder ............................................................................................... 4
......................................................................... 2
3. HOW TO ADJUST AND HOW TO USE THE SEWING MACHINE ................................ 5
3-1. Attaching the needle ........................................................................................................................................... 5
3-2. Threading the machine head .............................................................................................................................. 5
3-3. Adjusting the stitch length and reverse-feed stitching .................................................................................... 6
3-4. Indication of the direction of rotation of the bobbin case ............................................................................... 6
3-5. Thread tension ..................................................................................................................................................... 6
3-6. Presser foot pressure.......................................................................................................................................... 7
3-7. How to install the intermediate presser............................................................................................................. 7
3-8. Hand lifter ............................................................................................................................................................. 7
3-9. Height of the feed dog ......................................................................................................................................... 8
3-10. Adjusting the inclination of the feed dog .......................................................................................................... 8
3-11. Adjusting the stitch length for forward stitching and reverse stitching ........................................................ 8
3-12. Adjusting the waling foot and presser foot ....................................................................................................... 9
3-13. Needle-to-hook relationship ............................................................................................................................. 10
3-14. Feed timing ........................................................................................................................................................ 10
3-15. Relation between the counter knife and the tip of the thread trimmer blade (left) ..................................... 11
3-16. Adjusting the mesh of the knife ....................................................................................................................... 11
3-17. Adjusting the thread trimming cam ................................................................................................................. 12
3-18. Adjusting the amount of mesh of the thread trimmer blades ....................................................................... 12
3-19. Adjusting the counter knife pressure .............................................................................................................. 13
3-20. Auxiliary thread tension .................................................................................................................................... 13
3-21. One-touch type manual reverse stitching ....................................................................................................... 13
4. TROUBLES IN SEWING AND CORRECTIVE MEASURES ........................................14
1. SPECIFICATIONS
Application Pouches, bags, shoes
Sewing speed Max. 2,000 sti/min
Stitch length Max. 8 mm Thread #8 - #30
Lift of presser foot
Thread take-up lever Link-type thread take-up lever Motor to be used Servomotor
Needle bar stroke 38mm Oil be used Spindle oil
Needle to be used DP x 17 (DB x 1 can be used.)
Noise
Hand lifter : 6 mm
Knee lifter : 16 mm
- Equivalent continuous emission sound pressure level (LpA) at the workstation:
A-weighted value of 79.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 -ISO
11204 GR2 at 2,000 sti/min.
Needle system
Stitch adjusting method Dial
Lubrication method Automatic lubrication
DP x 17 #16 - #23 (Standard #22)
DB x 1 #20 - #23
● Applicable JUKI control box and motor
SC-921C
Destination
＊
-AA
Classification
of control box
Control box ................................SC-921 (Machine head setting (memory switch No. 95) "du12")
Motor .........................................M-51N
Position sensor ..........................SY-2
(Synchronizer)
Motor pulley ...............................Outside diameter: 75 mm (Marker: 80) Part No.: MTSP00750A0
V belt .........................................Size M M-40 Part No.: MTJV0040000
– 1 –
2. PREPARATION BEFORE OPERATION
2-1. Installing the knee lifter
1) Fully draw out knee lifter shafts
❷
Then, install it on the sewing machine.
❶
❶
2) Attach driving arm
3) Connect right and left driving arms
to respective shafts ❷.
❶
with link ❸.
❷
4) Install knee lifter lever
to driving arm ❶ on the
❹
left side.
❹
❸
❷
2-2. Installing the waste oil receiver
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
toward you.
together
❶
❻
❶ A
⇩
A
❸
❼
1) Fold mounting section
of waste oil receiver
A
bracket ❶ at a right angle.
2) Remove one lateral bracing strut setscrew
Insert folded mounting section A of waste oil re-
ceiver bracket ❶ into the section between strut
and lateral bracing strut ❹.
❸
3) Tighten lateral bracing strut
and waste oil
❹
receiver bracket ❶ with lateral bracing strut set-
screw ❷ together.
Firmly tighten lateral bracing strut set-
screw ❷.
❷
.
❹
❷
❺
❶
4) Place waste oil receiver
bracket ❶. Insert tube ❼ coming from oil pan
into waste oil receiver ❺.
* Adjust the length of tube
tance between oil pan ❻ and waste oil receiver
.
❺
– 2 –
on waste oil receiver
❺
according to the dis-
❼
❻
2-3. Lubrication
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
❷
❶
2-4. Oiling state
❶
1) Fill the oil tank with oil up to line H
❶
.
2) Carry out periodical inspection while the sewing
machine is in use to check the oil quantity. If the
oil surface level is below line L ❷, add oil until
the oil surface reaches line H ❶.
(Use "spindle oil".)
Run the sewing machine to check how oil splashes
on oil sight glass ❶.
2-5. Adjusting the amount of oil in the hook
❶
Decrease
Increase
– 3 –
Turn screw ❶ to adjust the oil quantity.
Turning screw ❶ in the "+" direction increases the oil
quantity, or in the "−" direction decreases it.
After adjusting the oil quantity with the
screw, run the sewing machine idle for 30
seconds or more. Then, check the oil be-
ing splashed from the hook.
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