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(3) Adjusting movable and fixed knives
A. Adjusting the position of movable knife-edge and hook stopper
a) When a movable knife ① passes the front side of the hook stopper ②, adjust the distance④ to be within 0.05~0.2
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 hole⑨ of the eccentric bushing⑧, 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.
※ When the clearance adjustment is finished, tightly fasten the fixing screw⑦ of the bushing.
c) The adjustment ⑫ of crossing height 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 collar⑧, as can be seen in figure 54.
28
[Figure 46]
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