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VII. ADJUSTING THE THREAD RELEASE MECHANISM
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air
supply from air compressor.
*A
Clearance between click and disk is 0.2 to 0.5 mm.
(5 places)
❼
*A
❻
❽
❾
❺
1)
2)
3)
1)
❹
2)
❶
•
❷
❸
•
– 15 –
1. Adjusting the disk-rise
Loosen setscrew ❷ in adjustment cam ❶ , turn
adjustment cam ❶ and disk-rise plate ❸ moves up
or down.
Adjust the clearance between the click section of
disk-rise plate ❸ and thread tension disk ❹ to 0.2
to 0.5 mm, and tighten setscrew ❷ .
If the click section of disk-rise plate ❸ comes in
contact with thread tension disk ❹ , sewing trouble
will be caused. So, be careful.
2. Adjusting the thread release
hook
Loosen setscrew ❺ . Adjust so that the top end of
tension release rod ❻ is spaced 45 ± 1 mm from
the top end of take-up thread guide ❼ . Then,
tighten setscrew ❺ .
Loosen setscrew ❾ , move the position of thread
release hook ❽ up or down, and the thread
remaining length at the start of sewing can be
adjusted.
When the position of thread release hook ❽ is
raised, the thread remaining length at the start
of sewing is decreased and when it is lowered,
the thread remaining length at the start of
sewing is increased.
If stitch skipping occurs at the beginning of
sewing when using non-elastic thread, properly
adjust the remaining length of top-covering
thread at the start of sewing using setscrew
and minimize the remaining length of looper
thread at the start of sewing using screw .
When the thread remaining length at the start
of sewing is short, stitch skipping or slip-off
of thread from needle eyelet at the start of
sewing is apt to occur.
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