HIGHLEAD GC20528-BDZA Buku Petunjuk - Halaman 12

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23.SAFETY CLUTCH DEVICE

Safety clutch device is installed to prevent the hook and cog belt from

damage in case the thread is caught into the hook when the machine is

loaded abnormally during operation.

1) Function of safety clutch

（1）When the safety clutch acts,the belt pulley will be unloaded,then

the rotation of hook shaft will stop.The arm shaft only will rotate.Stop the

operation of machine.

（2）Clean the thread thoroughly which is caught into the hook.

（3）Turn the pulley bushing by hand,and check whether the hook shaft rotates lightly and properly,place

the clutch device as follows.

2) How to set the safety clutch

（1）While pressing down the push button on the

opposite side of bed by left hand,turn the balance wheel

slowly by right hand away from you as shown in the figure.

（2）The balance wheel will stop by the gear plate,but

turn the balance wheel more firmly.

（3）Release the push button.

（4）As shown in the figure,the safety clutch device is

set.

3) Force applied to the safety clutch

（1）The force applied to the safety clutch is the

smallest when the white mark of the eccentric pin faces the

center of the lower shaft.The force proportionally increase

as the white mark faces the outside.

（2）To adjust the force slide the timing belt,loosen

the set screw,and turn the eccentric pin.

After the adjustment,make sure to tighten the set screw.

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