JUKI LU-1510 Engineer's Manual page 21

Adjustment Procedures
○ In case of LU-1508, LU-1508H, LU-1510.
1. Set the stitch dial to "0" mm.
2. Adjust the amount of alternate vertical movement of walking foot
and presser foot to the standard.
(Refer to "10) Feed movement" on page 13.)
3. Loosen two setscrews ① in the top feed cam.
4. Turn top feed cam ⑤ to the position where three points of needle
tip ② , top surface ③ of the throat plate and walking foot ④
(presser foot face) are aligned with each other on condition that
the amount of alternate vertical movement of walking foot and
presser foot is equal.
5. Securely tighten the setscrews.
(Standard)
• Setscrew No. 2 in the top feed cam faces in the direction of the
center (in the direction of the arrow mark) of the small end section
of top feed rod ⑥ at the lower dead point of the needle bar.
○ In case of LU-1510-7
1. Set the stitch dial to "0".
2. Adjust the scale of the alternate vertical movement dial to "3".
3. Remove the setscrews in the window plate C, and remove the
window plate C and the window plate C packing.
4. Loosen two setscrews ① in the top feed cam.
5. Turn top feed cam ⑤ to the position where three points of needle
tip ② , top surface ③ of the throat plate and walking foot ④
(presser foot face) are aligned with each other on condition that
the amount of aleternate vertical movement of walking foot and
presser foot is equal.
6. Securely tighten the setscrews.
(Standard)
• Setscrew No. 2 in the top feed cam faces just above when needle
and walking foot go up and are aligned with the top surface of
throat plate and the setscrew No. 1 in the top feed cam faces in
the direction of the arrow mark.
(Perform adjustment at the position where three points are aligned
with each other when needle and walking foot come down.)
I. Amount of alternate vertical movement of walking foot and presser
foot
◯ In case of the machine without thread trimmer
1. Loosen hinge screw nut ① of the top feed rod.
2. Move the position of boss ② of the cam rod up or down to adjust.
3. After the adjustment, tighten the nut.
• Upper section of the slot → operating amount is increased.
• Lower section of the slot → operating amount is decreased.
(Caution)
• The maximum sewing speed has been specified in
accordance with sewing conditions.
Set the maximum sewing speed appropriately in
accordance with the sewing conditions given taking care
not to exceed the corresponding specified value.
Results of Improper Adjustment
• Pitch error at high/low speed will be
deteriorated.
● Increase the operating height in
accordance with the sewing products.
• Sewing of sponge or the like
• Sewing of the material with stepped
● When the operating amount is
increased, stitch length pitch and the
graduation on the stitch dial will
change.
● Slightly decrease the number of
revolution of the motor since feed
force is deteriorated.
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section