kansai FX/UTC Series, Instruction Manual

6-3 Adjusting the back spring 

To cut the needle and looper threads, the movable 
knife moves to the stationary knife with the needle 
thread hooked on cutting edge A and the looper 
thread hooked on cutting edge B while entering the 
needle thread loop (see the illustration). 
Then the looper thread is held by the stationary 
knife and the back spring. 
Position the back spring by referring to the 
illustration and secure it with screws C. 

6-4 Adjusting the stopper 

Stopper C adjust the position to which the movable 
knives protrude.    With the needle bar at the top of 
its stroke, press the center of movable knife base B 
until the movable knives touch the stopper. 
Loosen screws D.  Adjust the movable knives so 
that they touch the stopper when the distance from 
bottom surface B of the movable knife base to 
bottom surface A of the needle plate is 18~18.5mm. 
Adjustment is made by loosening screws D. 

< Note > 

End E of the cylinder rod should tightly contact left 

and right stoppers C.  Be sure to turn off the air 

when adjusting the stoppers. 

< Note > 

Adjust the back spring so that the back spring does 

not hold the needle thread after it is cut. 

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