Fig.39
⑧
2.Grinding the stationary trimmer:
If the cutting performance deteriorates,Sh-
arpen the fixed knife ④ on a whetstone as Shown
in the illustration ⑤.
3.Removing the movable trimmer:
1) Remove the needle.
2) Uplift the presser foot using foot lifting lever.
3) Screw off screw⑥ (2 pieces), and take out
Clearance hole plate ASM.⑦
.
4) Turn the handwheel to allow the needle bar
⑧
to reach its highest position.
5) Lay down the sewing machine head.
6) Push thread-trimming driving crank lever⑨
in
direction of arrow till the position of screw ⑨ is
exposed.
7) Screw off screw ⑨ (2 pieces), and take out
movable trimmer ⑩
.
Caution:
1.To prevent the unexpected startup of sewing machine, trim off the power
supply before the operation is conducted.
2.Carry out the above steps in reverse to install the movable knife.
Fig.41Fig.40
③
Rotation direction of
sewing machine
At thread
trimming
At high speed
②
①
③
⑥
④
①
0.6-0.8mm
0.5mm
0
.
2
-
0
.
5mm
⑦
⑧
⑤
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