1. Positioning adjustment of wiper unit
(1) Loosen the wiper unit setscrew to adjust the unit overall so that
the clearance between wiper’s lower end surface C and the head
section D attains 21 ± 1mm when the wiper cylinder is actuated.
2. Adjustment of wiper stroke
(1) Loosen the fixing nut of the wiper stopper and move the wiper
stopper in Directions A and B.
oDirection A → Wiper stroke is decreased.
oDirection B → Wiper stroke is increased.
(2) After wiper stroke adjustments, tighten the fixing nut of the wiper
stopper and fix the wiper stopper .
(Caution) If the stroke is changed, the clearance is also changed
between wiper’s lower end surface C and the head section
D when the wiper cylinder is returned. Therefore,
loosen the wiper unit setscrew to adjust the unit overall
so that the clearance between wiper’s lower end surface
E and the head section F attains 1 mm.
– 18 –
0
– 0.5
o If the amount of wiper motion is
small, unthreading will be caused
at the sewing start.
o If the amount of wiper motion is
large, poorly tense stitches may
occur at the sewing start.
Adjustment Procedures Results of Improper Adjustment
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