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(3) Replacing the looper thread trimming knife (overall thread trimmer type)
When the looper thread is not cut sharply, replace
the looper thread trimming knife with a new one. The
part number of the looper thread trimming knife is
40115260.
[Replacement procedure]
1) Close the air cock (refer to "3-14. Installing the air
hose" p. 27) to remove air.
2) Remove screw ❶, washer ❷ and square die ❸.
3) Loosen the setscrew ❽ to remove collar ❹.
4) Remove screw ❻ and washer ❺.
5) Remove knife unit ❼. Assemble a new knife unit
(part number: 40115260) and x it by tightening the
screw.
6) Open the air cock (refer to "3-14. Installing the air
hose" p. 27) to supply air.
Looper thread trimming knife unit
WARNING :
1. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start
of the sewing machine.
2. To avoid unexpected personal injuries, be sure to keep away from the looper thread trimming
knife during work.
❼
❶
❷
❸
❺
❻
❹
❽
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