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Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
1) Original position of the driving arm stopper
1 Press down the roller arm 3 at the timing when going up to
the tip of needle 1 almost aligns with top surface 2 of the
throat plate, to make roller 7 is tightly fixed with a thread
trimmer cam 8.
Then, when the roller 7 lightly enters into the thread trimmer
cam, driving arm stopper 4 is fixed to the original position.
2 When roller 7 enters while roller 7 and the side of thread
trimmer cam 8 are rubbing with each other, it is necessary
to adjust the position of driving arm stopper 4 since the
abnorma worn-up of roller 7 or thread trimming failure due
to the loss of moving knife stroke occurs.
2) Adjusting procedure of the driving arm stopper
1 Loosen setscrews 5 in the driving arm stopper, move the
knife driving arm 6 to the left or right, and tighten setscrews
5 in the driving arm stopper at the position where roller 7
lightly enters without rubbing with thread trimmer cam 8.
* Adjust the position of the driving arm stopper 4 and perform
(4) Checking and adjusting the receding position of the
moving knife.
When the synchronizer is in trouble, UP/DOWN stop is not
performed and the safety circuit works or the sewing machine
continues running at high speed. Replace it with a new one in the
following procedure.
1) Remove the belt cover, loosen two setscrews 1 in the handwheel
and remove handwheel 3.
2) Remove two setscrews 2 in the stator installing base and remove
stator 4.
3) Fix a new stator 4 with two setscrews 2. tighten the setscrews
with the tightening torque of approximately 1.5N.m since the stator
installing base is made of the plastic.
4) Assemble so that screw No. 1 of handwheel 3 comes in contact
with the flat portion of the main shaft, and the clearance provided
between the flange of stator 4 installing base and the end plane
of handwheel 3 is 1±0.2 mm.
5) Turn handwheel 3 by hand and check whether there is any
place with which it rubs.
6) Wire the cord, put the V belt, attach the belt cover, and check
whether the cord, or the V belt comes in contact with the belt
cover.
7) Next, perform (3) Adjusting the position of the needle stop position.
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