HIGHLEAD GC20618-1DZ, Instruction Manual Parts Catalog

Page: 11 / 53

— 9 —
21.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.
22.ADJUSTMENT OF THE UPPER FEED
If the uneven feeding occurs according to the fabric.Adjust the long hole of the horizontal feed shaft
crank(right)to adjust the upper feed length.Adjust as follows:
（
1
）
Loosen the bolt.