SunStar KM-957 Series - Adjusting Lower Thread Holder; Exchanging Movable Knife and Fixed Knife

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󳦵 Adjusting lower thread holder
※
When the movable knife ① has finished trimming and
returned to its original position (arrow 󳟆), loosen the
fixing screw ③ so that the clearance between the
movable knife edge and the edge of the lower thread
holder ② is about 8mm and the equal point of the
lower thread edge is about 0.5mm inside (arrow 󳟇).
Make sure to check whether the inside of the movable
knife and the equal point of the lower thread holder
edge is completely touching as in part 󳟈.
⑷ Checkpoints on the assembling status of other trimming
devices
󳦲 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 16mm raised level when the movable knife
starts working, like in Figure 47.
󳦳 Maintenance of fixed knife
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 knife.
If the edge of the knife is too dull, sharpen the edge
using oil stone or sand paper.
17) Exchanging movable knife and fixed knife
⑴ Open the hook cover.
⑵ Loosen the screw ① and remove the fixed knife holder
cover ②.
⑶ Loosen the fixing screw ③ to disassemble the washer ④
and fixed knife ⑤.
⑷ Loosen the bolt ⑥ and dissemble the movable knife ⑦.
※ To assemble, follow the reverse order of disassembling.
18) Adjusting gear box
When adjusting the operating amount of the gear box ①, loosen the fixing nut ④ and ⑤ and adjust the distance between the
gear box ① and the gear box body ② to be 8mm, and between the gear box ① and the gear box body (right) ③ to be 25mm.
Lower the reverse lever fully when doing so and the standard clearance between ① and ② will be 3mm. Then, loosen the
gear box stopper ⑥ and the fixing nut ⑦ and adjust the gear box stopper ⑥ so that the clearance between the gear box
stopper ⑥ and the gear box body (left) ① is 0.2mm. Tighten the fixing nut ⑦.
[Figure 46]
[Figure 47]
about 16mm
Lowest point of thread take up lever
(OIL STONE) (SAND PAPER)
[Figure 48]
[Figure 49]
[Figure 50]