HIGHLEAD GC20528-BDZA Manuale di istruzioni - Pagina 14

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26.INSTALLATION OF MOVABLE KNIFE

1) Installation of movable knife

（1）Turn the balance wheel and lower the needle bar to the lowest position.

（2）Push the cam follower crank so that the cam roller enters into the thread trimmer cam groove.

（3）Turn the balance wheel until the black mark point on the arm meets the white mark point on the

balance wheel.Set the cam follower crank at this position with a screwdriver temporarily preventing the cam

roller coming out from the cam groove.

（4）Loosen the thread trimmer rocking crank clamp bolts A and B.

（5）Adjust the movable knife so that the movable knife end slant portion protrudes 0-0.5mm from the

fixed knife,as shown in figure and tighten the bolts A and B.

2) Gap between movable knife and bobbin case holder stopper

（1）Turn the balance wheel by hand until needle reaches the lowest position.

（2）With the needle at the lowest position,depress cam follower crank,turn the balance wheel until the

movable knife reaches the extremity of its stroke.

（3）Manually rotate the inner hook in the direction indicated by arrow in figure and adjust gap between

the movable knife and the inner hook stopper to about 0.5mm(the screws A and B should be loosen for this

adjustment).

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