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(3) Adjusting movable and fixed knives
A. Adjusting the position of movable knife-edge and hook stopper (See Figure 48.)
a) When a movable knife ① passes the front side of the hook stopper ②, adjust the distance ④ to be within 0.05~2
mm range like part ③. The upper surface of the movable knife-edge ⑥ should be set up 0.2mm below the upper
side of hook stopper ⑤. (※ Given that the fixed knife is pressing down the movable knife.)
b) Clearance ④ adjustment of the movable knife edge and hook stopper front side
Loosen the needle plate
Place the hook stopper in the hanging position to the needle plate
Holding the hook with the hand, manually operate trimming movement so that the movable knife-edge is
matches the stopper front side ③.
Loosen the fixing screw ⑦ of the movable knife shaft eccentric bushing.
In the lower side hole ⑨ of the eccentric bushing ⑧, stick in a thin driver or adequate pin ⑩ and turn right and
left. This will make the position of the movable knife shaft ⑪ change, hence changing the distance ④.
When the clearance adjustment is finished, tightly fasten the fixing screw ⑦ of the bushing.
c) The adjustment of crossing height ⑫ between the hook stopper upper side ⑤ and movable knife edge upper side
⑥ is possible to certain degree by adjusting the movable knife base washer ⑦ or by changing the position of
movable knife shaft collar ⑧, as can be seen in figure 49.
[Figure 48]
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