JUKI LK-1910 Engineer's Manual page 27

Adjustment Procedures
1) Loosen adjusting screw 1 in the thread trimmer magnet and
make thread trimmer magnet 3 draw in the direction of A at
the approach run section of thread trimmer cam 2 [refer to 2)
Adjusting the thread trimmer link stopper screw, p.17]. At this
time, adjust the position of thread trimmer magnet arm 5 so
that a clearance of 1 mm is provided between the cam face of
thread trimmer cam 2 and the roller attaching face of cam
installing link 4. Then tighten screw 1.
Results of Improper Adjustment
™ Thread trimmer roller enters the
slit of thread trimmer cam,
causing thread trimmer failure or
sewing machine lock.
™ Returning to the initial position
of the thread trimmer is delayed,
and release of the tension
release disk floating is also
delayed, causing poor-tightened
stitches at the sewing start or
stitch skipping.
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