−14 −
Adjustment Procedures Results of Improper Adjustment
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring the needle bar to the lower dead
point of its stroke.
3. Turn the handwheel so that screw No. 2 ① in the lower
sprocket wheel is parallel to top surface ② of the machine
bed.
4. Engage timing belt ③ with lower sprocket wheel ④ .
(Caution) • Fig. 17 shows the state when it is observed
from the handwheel side.
○ In case of LU-1508H
1. Set the stitch dial at its maximum.
2. Loosen two setscrews ① in the feed drive eccentric cam.
3. Turn the handwheel to bring the needle bar to the lower dead
point of its stroke.
4. Turn feed drive eccentric cam ② to adjust so that the feed
dog does not move even when moving the reverse feed
control lever.
5. Securely tighten the setscrews.
(Standard)
• Setscrew No. 1 in the feed drive eccentric cam faces almost
just above at the lower dead point of the needle bar
○ In case of LU-1508H
1. Set the stitch dial at its maximum.
2. Loosen two setscrews ① in the feed triangular cam.
3. Turn feed triangular cam ② to adjust so that the feed dog
does not move even when moving the reverse feed control
lever.
4. Securely tighten the setscrews.
(Standard)
• Setscrew No. 1 in the feed triangular cam faces almost just
above at the lower dead
(Caution) • When performing adjustment, if the cam slips in
the axial direction, torque becomes heavy. So, be
careful.
• Adjust the feed drive crank connecting rod so that
it is positioned almost in the center of the end face
of thrust collar ③ of the feed drive eccentric cam
and the end face of the feed drive eccentric cam.
• After adjusting the feed drive timing, re-adjust the
top feed timing.
• Loose stitches will result.
• Feed timing and needle-to-hook
timing will change.
• Pitch error at high/low speed will be
deteriorated.
• Thread tension will change.
• Stitch tightening in normal/reverse
feed will change.
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