−
18
−
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 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
p l a y o f t h e a x i a l
direction of the main
shaft, position and
timing of the thread
trimmer cam or related
components.
1) Determine the position of thread trimmer cam
3
, and tighten
screw No. 1
1
of the thread trimmer cam from the upper side
of the sewing machine.
2) Turn the main shaft by 1/4 rotation in the normal direction, and
tighten screw No. 2
2
of the thread trimmer cam from the upper
side of the sewing machine as well.
1) Tilt the sewing machine head.
2) Turn the main shaft and fit thread trimmer roller
2
to approach
run section
A
of slit
6
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 section
B
of thread trimmer connecting bar
5
,
and when tightening further, cam installing link
1
turns in the
direction of arrow (
f
). Then thread trimmer roller
2
which was
lightly fit to the thread trimmer cam enters slit
6
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 slit
6
of
the thread trimmer cam. Then tighten nut
3
to fix it.
At this time, fix thread trimmer link stopper screw
4
so that it
does not turn together with nut
3
and tighten nut
3
.
™
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
p l a y o f t h e a x i a l
direction of the main
shaft, position and
timing of the thread
trimmer cam or related
components.
