−
22
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Adjustment Procedures
Results of Improper Adjustment
™
Thread trimming failure will
occur.
™
Lock of the sewing machine will
occur at the sewing start or at
the time of thread trimming.
™
Returning to the initial position of
the thread trimmer mechanism
is delayed, and poor-tightened
stitch of the first stitch at the
sewing start will occur.
Caution :
When the lock of the sewing
machine has occured, check
the play of the axial direction
of the main shaft, position
and timing of the thread
t r i m m e r c a m o r r e l a t e d
components.
①
Tilt the sewing machine head.
②
Turn the main shaft and fit thread trimmer roller
2
to the running
section
A
of the slit of the thread trimmer cam.
③
Loosen nut
3
and loosen thread trimmer link stopper screw
4
to the position where it separates from section
B
of thread
trimmer connecting bar
5
.
④
Pressing cam installing link
1
in the direction of arrow, lightly
fit thread trimmer roller
2
to the thread trimmer cam. (It does
not enter the slit of the cam.)
⑤
Start tightening thread trimmer link stopper screw
4
. The top
end of thread trimmer link stopper screw
4
comes in contact
with the section
B
of thread trimmer connecting bar
5
, and
when tightening further, cam installing link
1
turns in the
direction of arrow (
⇦
). Then thread trimmer roller
2
which
was lightly fit to the thread trimmer cam enters the slit of the
thread trimmer cam
⑥
Screw further thread trimmer link stopper screw
4
by half turn
from the point where thread trimmer roller
2
entered the slit of
the thread trimmer cam. Then tighten nut
3
to fix it.
At this time, tighten nut
3
after fixing thread trimmer link stopper
screw
4
so that it does not turn further.
™
Thread trimming failure will
occur.
™
Lock of the sewing machine will
occur at the sewing start or at
the time of thread trimming.
™
Returning the initial position of
the thread trimmer mechanism
is delayed, and poor-tightened
stitch of the first stitch at the
sewing start will occur.
Caution :
When the lock of the sewing
machine has occured, check
the play of the axial direction
of the main shaft, position and
timing of the thread trimmer
cam or related components.
Determine the position of the thread trimmer cam, and tighten screw
No. 1
1
of the thread trimmer cam from the upper side of the
sewing machine.
Turn the main shaft by 1 / 4 rotation in the right direction, and
tighten screw No. 2
2
of the thread trimmer cam from the upper
side of the sewing machine as well.
Summary of Contents for LK-1941
Page 2: ......
