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7-17 Adjustment of the upper thread tension release
[NOTE]
(a) The upper thread tension release works when the upper thread is trimmed automatically or the
presser foot is lifted during the work holder feeding.
(b) If the upper thread tension release does not work properly when the upper thread is trimmed
automatically, the thread tail from the needle becomes shorter then, it induces the skip stitch
happening or pulling the thread tail out of the needle at the start of the sewing.
(c) During the sewing operation, the discs
presser foot is moving up and down.
If the discs
loose and the proper stitch condition can not be obtained.
(d) When the upper thread tension release is activated, the discs
regulator opens 0.8～1.0mm. This is the normal conduction of the discs
adjustment, take the following procedure.
(1) Remove the top motor cover．
(2) Fully turn the crank
(3) adjust the upper thread tension release for the discs to be opened 0.8 to 1.0 mm． 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) lf the normal opening of the discs can not be obtained with the nut adjustment，loosen the wire fix
○
screws
5 and adjust the tension of the wire
○
(5) The wire
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 mechanical home position
[NOTE]The mechanical home position is fixed at the center of the sewing area when the sewing machine is
shipped from the factory．However，it can be moved within the area covered with diagonal lines．
From the library of: Superior Sewing Machine & Supply LLC
○
1 of the thread tension regulator is not closed, the upper thread tension becomes
○
○
3 of the rotary solenoid
○
6 ．
23
—
○
1 of the thread tension regulator is closed while the
2 in the arrow direction．At this time，
—
○
1 the upper thread tension
○
1 opening. For this
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