HIGHLEAD GC20528-BDZA Gebruiksaanwijzing - Pagina 12
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Pagina afdrukken23.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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