ā 91 ā
1) Remove the hammer and check the condition of the
hammer surface. (Refer to "10-14. (2) Replacing
the cloth cutting knife and the hammer" p.92.)
2) When the knife mark is too deep, the knife mark is
duplicate (A of Fig. on the left side) by using another
knife or the knife mark is partially formed and not
formed on the whole surface (B of Fig. on the left
side), grind the face with an oil stone or the like so
that the knife mark becomes uniform.
Contact face of the hammer with the cloth
cutting knife.
(1) Worn-out of the hammer face
Can be corrected
up to 0.3 mm.
1. When replacing the knife, use a new hammer or a corrected hammer.
Breakage of the blade tip of the cloth cutting knife may occur.
2. The grinding amount of the hammer should not exceed 0.3 mm. If the knife sharpness cannot
be re-obtained by grinding it to the limit, replace the hammer with a new one.
A
22 mm
3) When the cloth cannot be precisely cut although the hammer is properly corrected, check the state of worn-
out of the blade tip of the cloth cutting knife.
10-14. Replacing consuamables
Whenever the hammer is adjusted, a 0.1 to 0.3 mm spacer has to be adhered on the top surface
according to the grinding amount to adjust the height to check the sharpness of the knife blades.
If the sharpness checking proves poor sharpness, select a 0.1 to 0.3 mm spacer and place it between
the hammer and the cloth trimming arm.
The 0.1 to 0.3 mm spacer has to be purchased separately.
Part number: 40115638 SPECER_01 (Thickness: 0.1 mm)
40115639 SPECER_02 (Thickness: 0.2 mm)
40115640 SPECER_03 (Thickness: 0.3 mm)
Spacer
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.
B
C
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