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Adjustment Procedures Results of Improper Adjustment
™ Pitch error at high or low speed
is apt to occur.
™ Needle thread tension will vary.
™ Stitch tightness at normal and
reverse feed will vary.
1) Horizontal feed cam timing
™ In case of LU typre machines other than LU-1508NH and
LU-1509NH
1. Set the stitch dial to the maximum.
2. Loosen two setscrews 1 in the horizontal feed eccentric cam.
3. Turn the handwheel to bring the needle bar to the lowest dead
point of its stroke.
4. Turn feed eccentric cam 2 and adjust the timing so that the
feed dog no longer moves even when the reverse feed control
lever is moved.
5. Securely tighten two setscrews 1 in the horizontal feed
eccentric cam.
(Standard) The setscrew No. 1 in the horizontal feed eccentric
cam faces almost right above at the lowest dead point of
the needle bar.
™ In case of LU-1508NH and LU-1509NH
1. Set the stitch dial to the maximum.
2. Loosen two setscrews 4 in the feed triangle cam.
3. Turn feed triangle cam 5 and adjust the timing so that the
feed dog no longer moves even when the reverse feed control
lever is moved.
4. Securely tighten setscrew 4 in the feed triangle cam.
(Standard) The screw No. 1 in the feed triangle cam faces
almost right above at the lowest dead point of the needle
bar.
(Caution)
1. If the cam slips in the axial direction at the time of
adjustment, torque becomes heavy. So, be careful.
2. Adjust the horizontal feed rod so that it comes almost
in the center between the edge of horizontal feed cam
lid 3 and that of horizontal feed eccentric cam.
3. After adjusting the horizontal feed timing, re-adjust the
vertical feed timing.
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