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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Lower looper
❷
Upper looper
* Check that the clearance between the projecting part of the lower
looper
❶
and the blade point of the upper looper
❷
is 1 ± 0.5 mm
(A) when the upper looper goes up and the upper looper blade point
meets the lower looper.
* Check that the front-to-back clearance between the upper looper blade
point and the lower looper
❶
is 0.1 to 0.3 mm (B).
How to perform adjustment:
○
Loosen the setscrews (E) of the upper looper cam.
○
Rotate the upper looper cam (D) to make adjustment (A).
○
Retighten the setscrews (E).
○
Loosen the setscrew (C) of the upper looper
❷
.
○
Move the upper looper
❷
front back to make adjustment (B).
○
Retighten the setscrew (C).
If the clearance is larger than the
standard adjustment value, stitch
skipping can be caused.
If the clearance is smaller than the
standard adjustment value, the
relevant parts can come in contact
with each other, resulting in abnor-
mal noise and abrasion.
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