− 175 −
11.8mm
6
7
8
2) Adjusting the position of the cam roller
Loosen stopper lock nut 8, turn the stopper, and
tighten cam roller 6 at the position of 11.8 mm.
(Refer to the illustration on the left side.)
Bottom surface
of base plate
1. When the position of cam roller 6
is excessively higher as against
hook driving shaft 7, the moving
knife rocking stroke is decreased
and thread trimming failure will be
caused.
2. On the contrary, the position is
excessively lower, the rocking
stroke is increased and the length
of remaining needle thread is
shortened or the blade point is
damaged.
1.7mm
6
5
7
3
4
1
2
1) Remove the bottom cover, press drive block 3 by
finger in the direction of arrow mark A. At this time,
loosen setscrews 4 and adjust so that the
clearance is 0.1 to 0.5 mm.
2) Take the finger off, and check that there is a
clearance between cam roller 5 and edge 6 of
the thread trimmer cam.
3) Secure an approximate clearance of 0.5 mm
between slide arm 1 and E ring 7.
(3) Adjusting the initial position of the thread trimmer solenoid
Adjust the initial position so that the clearance between slide arm 1 and drive shaft arm 2 is 0.1 to 0.5 mm
when the thread trimmer solenoid performs suction.
1. When the clearance is larger than
the specified value, malfunction of
thread trimming may occur.
2. When the clearance is smaller than
the specified value, the load applied
to each component is increased and
there is a danger of occurrence of
abnormal worn-out.
0.1
〜〜
〜〜
〜 0.5mm
A
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