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❹
22 ± 0.5 mm
0 to 0.1 mm
❹
Light contact
When lower knife ❹ is located at its leftmost position,
the top end of the lower knife ❹ has to be spaced 22 ±
0.5 mm from the center of needle bar.
Center of needle
bar
Check the leftmost point with the pneumatic device
turned on. Adjustment should be carried out with the air
pressure set at 0.5 MPa.
Adjust the position of stopper so that a clearance of
0.3 to 1 mm is provided between looper and clamp
pressure adjusting spring when the counter knife is
located at its leftmost position (forward end).
When the needle is positioned at its upper dead point,
the clearance of 0 to 0.1 mm has to be provided be-
tween the under surface of lower knife ❹ and the top
surface of looper .
0.3 to 1 mm
When the lower knife moves from right to left, the lower
knife guide holder should lightly comes in contact with
the guide.
– 13 –
6. Initial position of the looper
thread trimmer mechanism
7. Adjusting the stopper
8. Adjusting the height of the
lower knife
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
9. Adjusting the lower knife
holder guide
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