– 19 –
8.
Adjusting the rear needle guard
4
0 to
0.05 mm
0 to
0.05 mm
2
1
A
B
3
1.5 to 2 mm
2
Adjust the lateral position of rear needle guard
1
so
that it receives the needle within the range of
B
when
the needle is in its lowest position.
1) Adjust the height with setscrew
2
so that the
distance from edge line
A
of rear needle guard
1
to the top end of right-hand needle is 1.5 to 2 mm
when the top end
3
of the looper comes from the
extreme right end to the center of right-hand needle.
2) Make rear needle guard
1
slightly come in contact
with the right-hand needle so that the clearance
between right-hand needle and top end
3
of the
looper is 0 to 0.05 mm when top end
3
of the looper
comes from the extreme right end to the center of
right-hand needle.
In addition, make rear needle guard
1
slightly come
in contact with the medium needle so that the clear-
ance between the medium needle and top end
3
of
the looper keeps 0 to 0.05 mm when top end
3
of
the looper comes to the center of medium needle.
Perform the adjustment with setscrews
2
and
4
.
9. Relation between the rocking thread take-up timing and the needle thread loop
In the case stitch skipping or thread breakage occurs because the needle thread loop is too large or too small,
change the needle thread feeding timing of the rocking thread take-up to adjust the size of the needle thread loop.
1. When screw1. When screw
1
is loosened, the rocking thread take-up rotates due to the light weight. So, be careful. If
it rotates, refer to the item “
^
2. Do not change the timing other than the aforementioned one since the sewing trouble will be caused.
1) Loosen screw
1
.
2) Move
2
forward or backward. The relation between
the moving direction and the size of needle thread
loop is as shown in the table below.
3) After the adjustment, securely tighten screw
1
.
* Clearance between crank
2
and thrust collar
3
has
been factory-adjusted to 8 mm at the time of deliv-
ery. (Engraved marker line on rocking thread take-
up shaft
4
aligns with the edge of crank
2
.
¡
Size of needle thread loop
3
4
2
1
8 mm
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol-
lowing work after turning the power off and ascertaining that the motor is at rest.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol-
lowing work after turning the power off and ascertaining that the motor is at rest.
Move forward Move backward
Loop becomes smaller. Loop becomes larger.
(1) Adjustment by the crank
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