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Adjustment Procedure
Results of Improper Adjustment
1. Select an appropriate thrust plate
of the hook shaft and adjust the
clearance at the thrust plate.
2. Set the hook
over the hook shaft
while pressing the hook down
to prevent any axial play.
When fastening the set screws
of the hook, first fasten the set
screw No. 1, by reference to the direction of rotation, of screws on
the flat section
of the hook shaft
. Then, fasten the set screw
No. 2, in terms of the direction of rotation, of screws.
3. For how to adjust the thread trimmer after the completion of the ad-
justment of the clearance between the throat plate and the inner hook
stopper, refer to [3-(10), -(11) and -(12) Thread Trimmer Device].
o If the clearance between the throat
plate and the inner hook stopper
is too large:
• The inner hook may come off
the throat plate.
o If the clearance between the throat
plate and the inner hook stopper
is too small:
• Loose stitches (isolated idling
loops) may result.
• The moving knife may interfere
with the hook at the time of
thread trimming.
