31
18) Replacing movable knife and fixed knife
⑴ Lift the presser foot ① and open the slide plate ②.
⑵ Disassemble the needle plate ③.
⑶ Loosen the fixing screw ④, to disassemble the washer
⑤, fixed knife ⑥ and lower thread holder ⑦.
⑷ Loosen the fixing screw ⑧ and dissemble the movable
knife ⑨.
※ To assemble, follow the reverse order of disassembling.
19) Adjusting thread release (for automatic trimming type)
If the upper thread is pulled out of the needle hole after trimming, check whether the thread tension adjusting plate ①
separates during trimming. To adjust the opening of the thread tension adjusting plate, put the thread release solenoid ② at
operation and move back and forth the solenoid shaft collar ③ to make sure that the opening of the plate would be 0.8mm
wide. Also, make sure that the plate is completely attached when the solenoid is not working. (See Figure 61)
(Note)
※ If the plate does not open widely enough during trimming, but properly assembled, check weather the volume adjusting
the remaining upper thread on the control box is too low.
[Figure 60]
③
⑥
⑦
⑤
④
①
⑨
⑧
②
[Figure 61]
①
②
③
About
0.8mm
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