HIGHLEAD GC20528-BDZA Manuale di istruzioni - Pagina 15

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27.ADJUSTMENT OF THREAD TRIMMER CAM

（1）Turn the balance wheel by

hand until the needles reach the lowest

position.

（2）Maintaining

position,depress the cam follower

crank and put the cam roller into the

groove of thread trimmer cam.

（3）Turning the balance wheel

by hand,adjust the thread trimmer cam

so that the movable knife starts

moving when the green mark point on the balance wheel

comes in line with the black mark point on the arm.

Note:To adjust,loosen two thread trimmer cam clamp

screws A.

28.ADJUSTMENT OF SCISSORING PRESSURE OF MOVABLE KNIFE

AND FIXED KNIFE

（1）Loosen the fixed knife bracket clamp bolt A.

（2）Turn the vertical position adjusting screw B to adjust meshing

pressure and then righter the hexagon socket head cap screw A.

Note:Since excess pressure cause large torque to the thread

trimming mechanism and trimming failure,adjust it so that thread

can be trimmed with minimum pressure.

（3）Move the movable knife and check that the thread can be

sharply trimmed.

29.SHARPING OF FIXED KNIFE

When the knives dull,the fixed knife should be sharpened as illustrated in figure.Since it is very difficult to

sharpen the movable knife,replace it with a new one when it dulls.

the

needle

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