SunStar KM-757 - 17) Replacing movable knife and fixed blade

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(4) Checkpoints on the assembling status of other
trimming devices
A. Check the starting point of the movable knife
when the trimming action takes place
Operate trimming movement manually to check
whether the thread take up lever is in the lowest or at
least 2.5 mm raised level when the movable knife
starts working, like in Figure 52.
B. Maintenance of fixed blade
When the thread does not get trimmed or if the
trimmed section of the thread is sloppy, please check
the edge condition of the fixed blade.
If the edge of the knife is too dull, sharpen the edge
using oil stone or sand paper. (See Figure 53.)
17) Replacing movable knife and fixed
blade (See Figure 54.)
(1) Lift the presser foot ① and open the slide plate lefts ②,
right ③ and front ④.
(2) Disassemble the needle plate ⑤.
(3) Loosen the fixing screw ⑥, to disassemble the washer
⑦, fixed blade ⑧ and lower thread holder ⑨.
(4) Loosen the fixing screw ⑩ and dissemble the movable
knife ⑪.
※ To assemble, follow the reverse order of disassembling.
0~2.5mm
(Point where
the movable
knife starts its
movement)
Thread take
up lever’s
lowest point
60。
60。
OIL STONE SAND PAPER
[Figure 52]
[Figure 53]
[Figure 54]