−22 −
Adjustment Procedures Results of Improper Adjustment
1. Loosen hinge screw nut ① of the feed drive rear arm.
2. Move feed rock connecting rod ② so that the distance from
the center of the feed rock shaft to the center of the hinge
screw is 20 ± 0.5 mm and tighten the nut.
3. Turn the handwheel to check the needle sway.
(Standard)
• Engraved marker line on feed drive rear arm ③ is aligned
with the center of the hinge screw.
1. Set the stitch dial to 6 mm.
2. Loosen two setscrews ① in the feed regulator eccentric pin.
3. Turn feed regulator eccentric pin ② to adjust the stitch length.
Direction A → reverse feed pitch is increased.
Direction B → normal feed pitch is increased.
4. After the adjustment, securely tighten the setscrews.
(Standard)
• When the direction of the notch of eccentric pin is set to the
right sideway as shown in Fig. 29, the feed amounts of normal
and reverse feeds are nearly the same.
1. Turn the handwheel to make the screw No. 1 of top feed cam
② upward.
2. Adjust so that the screw No. 1 of balancer ① is aligned with
the screw No. 1 of the top feed cam, and securely tighten the
screws.
At this time, adjust so that the clearances between the end
face of top feed cam, main shaft intermediate bushing and
the end face of balancer are nearly equal.
• Needle breakage or stitch skipping
will result.
• Respective stitch lengths of normal
and reverse feeds do not match.
• Vibration is increased.
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