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1. Method of confirmation
(Cautions) Confirmation should be carried out under the
conditions that the hook and bobbin case plus bobbin
are installed.
(1) Let the sewing machine fall down.
(2) Assume a condition that the thread trimmer solenoid is attracted
by hand.
(3) In this state, the standard clearance is 0.5mm at the stepped part
between the picker link and the picker arm . At that time, the
clearance between the bobbin and the picker is 0 to 0.3mm.
(Important) When standard adjustments are completed, an oblong
clearance is secured in the picker link and
indispensable return motions (damper function) can
be performed.
(4) The position where the picker enters should stay almost in the
center of Character U of the bobbin case.
2. Method of standard adjustments (Adjustment of clearance)
(1) Let the sewing machine fall down.
(2) Assume a condition that the thread trimmer solenoid is attracted
by hand.
(3) Loosen the picker link pin nut (9mm) and move the picker link
to the right and left for adjustment.
(4) After the completion of adjustments, fasten the parts assuredly.
3. Method of standard adjustments (Adjustment of tip position)
(1) Let the sewing machine fall down.
(2) Assume a condition that the thread trimmer solenoid is attracted
by hand.
(3) Loosen two picker setscrews to adjust positioning.
(4) After the completion of adjustments, fasten the parts assuredly.
When there is no clearance of the
picker :
o Since the bobbin is pressed too
much, the bobbin cannot make
a required turn at the time of thread
trimming and the bobbin thread is
cut short as a result. Therefore,
needle thread castoff tends to
occur at the beginning of sewing.
When there is a large clearance of
the picker :
o The needle thread is disengaged
from tip of the picker at the time
of thread trimming. Thus, the
needle thread remaining at the
needle tip becomes short after
thread trimming.
oA bobbin idling phenomenon
occurs frequently and this can be
a possible cause of problems at
the beginning of sewing.
Adjustment Procedure Results of Improper Adjustment
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