Problem
3.
Upper shaft does
not
turn.
4.
Stitch cannot be made.
5.
Needle breaks.
Check
point
1.
Is
thread tangled in rotary hook?
[How
to
adjust]
Remove rotary hook and
see
whether
upper shaft rotates
or
not.
If
thread
is
tangled,
turn
upper shaft
byforcetotrim
thread
or
remove rotary hook and thread.
1.
Is
needle attached properly?
2.
Is
timing
of
needle and rotary hook correct?
1.
Is
needle direction and height properly adjusted?
2.
Is
needle bent?
3.
Is
needle
tip
blunted?
4.
Is
timing
of
needle and rotary hook correct?
5.
Is
there looseness
or
play in
the
needle bar
case?
· When there
is
play in the needle bar
case
Collar
Collar
Adjust collar
when
there
is
looseness
of
cam
shaft
in
needle bar
flip-up
mechanism.
6.
Is
rotary hook holder properly attached
so
that
rotary hook
does
not
rotate?
-119-
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