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Adjustment Procedures Results of Improper Adjustment
™ Pitch error at high or low speed
will be deteriorated.
™ Thread tension will vary.
™ Stitch tightness at normal and
reverse feed will vary.
1) Horizontal feed cam timing
™ In case of LS-1340 and LS-1341 :
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 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 LS-1342 and LS-1342-7 :
1. Set the stitch dial to the maximum.
2. Loosen two setscrews 1 in the horizontal feed eccentric cam.
3. Turn the handwheel and adjust the needle bar to the position
of the hook adjusting timing ((5) Needle-to-hook timing).
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 setscrews 1 in the horizontal feed eccentric
cam.
(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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