－31－
(2) Fully turn the crank (No.3) of the rotary solenoid (No.2) in the arrow direction. At this time,
adjust the upper thread tension release for the discs to be opened 0.8~1.0mm.
(3) For this adjustment, loosen the nut
A
then, if tighten the nut
B
, the discs opening
becomes wider and if loosen the nut
B
, it becomes narrower.
(4) If the normal opening of the discs can not be obtained with the nut adjustment, loosen the
wire fix screws (No.5) and adjust the tension of the wire (No.6).
(5) The wire (No.6) may be got longer over a long period machine operation. At that time,
adjust the upper thread tension release again.
7-18. Adjustment of the synchronizer
NOTE (a) When the sewing is finished, the arm timing mark
A
and the pulley timing mark
B
are matched with each other then, the sewing machine is stopped the running. This is
the normal condition.
(b) If theses timing mark
A
and
B
get out of the matching more than 3mm, adjust
the timing mark matching.
Hold the sewing machine pulley (No.1) by hand and insert the angle adjuster (No.2) into the
hole
C
then, turn the angle adjuster (No.2). If turn the angle adjuster (No.2) to the clockwise,
the pulley timing mark
B
comes down and if turn it to the counter clockwise, the pulley timing
mark
B
goes up. The angle adjuster (No.2) is enclosed in the accessory box.
1
6
A
B
0.8～ mm
1.0
2
5
3
1
2
A
C
B
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