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12) Replacement of the knife unit
[Method of replacement]
1. Let the sewing machine fall down.
2. Remove the needle, hook, and the inner hook presser.
3. Remove the moving knife link stepped screw B .
* If removal is difficult to carry out, try to loosen the stepped screw
and move the picker link before work.
4. Remove the knife unit fixing screw and the picker arm hinge
screw , and take out the knife unit .
13) Installed length of the thread trimmer connector bar (asm.)
1. Install two rod ends so that they cross each other at right angles.
Then, fix then with the nuts .
2. In order to avoid loosening by mistake at the time of shipment, ìwhite
paintî is applied to the nuts .
3. Loosen the nuts when removing the thread trimmer connector
bar (asm.) (40086708) without drawing out the lower shaft. When
the nuts are loosened, the respective subsidiary parts are
disassembled and the thread trimmer connector bar can be taken
out.
4. After disassembly, reassemble the parts so that the standard
adjusting values can be secured.
Adjustment Procedure Results of Improper Adjustment
o If the two rod ends are not
crossed at right angles, the
obtained torque is the value for
thread trimming.
o If the center-to-center distance
(99.5±0.4mm) deviates from the
standard value, the initial position
of the moving knife is changed
and this can be a cause of thread
trimming failure.
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