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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Left hand needle
❷
Upper looper
* Check that distance (projecting amount) A from the left end of left
hand needle
❶
to the blade point of upper looper
❷
is 6.8 ± 0.3 mm
when the upper looper is in its leftmost position.
How to perform adjustment:
○
Bring upper looper
❷
to its leftmost position.
○
Loosen setscrew (B) of the upper looper arm.
○
Adjust the projecting amount of the upper looper by moving upper
looper siding shaft (C) up and down.
○
Tighten setscrew (B) of the upper looper arm.
○
Turn the handwheel to check whether the rotation torque is increased.
○
Loosen screw (D). Adjust so that a clearance of 0 ± 0.15 mm (E) is
provided between the needle and the upper looper.
If the standard adjustment value is
exceeded, stitch skipping can be
caused.
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