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Blade point of lower knife is in the
center of thickness of looper.
❹
1)
2)
9 mm
3)
4)
❺
The safety switch is installed so that the sewing ma-
chine does not start unless the looper thread trimmer
device returns to its home position.
1)
2)
3)
Speed of the looper thread trimmer device can be
changed with speed controllers and of air cylinder
❸ .
1)
❸
2)
– 14 –
10. Adjusting the longitudinal
position of the blade point of
lower knife
Bring the needle bar to its highest position.
Adjust so that the blade point of lower knife ❹ is in
the center of the thickness of looper when the
clearance between the right-hand edge of looper
and the blade point of lower knife ❹ is 9 mm.
Loosen nut , move lower knife holder ❺ to and
fro, and adjust the position of the blade point of
lower knife ❹ .
After the adjustment, tighten nut .
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
11. Adjusting the thread trimmer
sensor
Loosen setscrews .
Adjust switch plate so that LED of thread
trimmer sensor lights up in the state that the
thread trimmer device is fully returned to its home
position.
Tighten setscrews .
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
12. Adjusting the speed of
looper thread trimmer
When you desire to change the protruding speed
of lower knife, loosen the nut of speed controller ,
and turn the adjustment screw.
When you desire to change the returning speed of
lower knife, loosen the nut of speed controller ,
and turn the adjustment screw.
After the adjustment, tighten the nuts of speed
controllers and .
• When the protruding speed of lower knife is
slow, thread trimming failure will be caused.
• When the returning speed of lower knife is
fast, lower thread clamp failure or uneven
needle thread remaining length will be
caused.
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