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11
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1) The knife moves in accordance with the lifting of the button
clamp. Therefore, the length of the remaining thread on
the wrong side of a fabric depends upon the height of the
button clamp at which the thread is trimmed.
For the adjustment, insert something of 10 mm thick into
section
A
and make a state that button clamp jaw levers
1
are lifted .
Loosen screw
2
and tighten screw
2
to fix the button
clamp in the state that lifting hook
3
is pressed to the
lower side.
2) Make adjustment by turning the pressure adjusting nut
1
.
™
Increasing the lifting amount of the
button clamp will increase the length
of the remaining thread. Especially in
case of MB-372, thread tightness
becomes strong at the end of sewing
resulting in thread breakage and thread
slip-off.
™
If the lifting amount of the button clamp
is too low, the length of the remaining
thread will become short resulting in
thread slip-off.
™
If the pressure of the button clamp is
too low, the thread end at the start of
sewing will come out on the wrong side
of the fabric unevenly by 10 to 20 mm.
Adjustment Procedures
Results of Improper Adjustment
