MACHINE ADJUSTMENTS
CHAPTER 11
11-1
11-1) ADJUSTING THE TRIMMERS
11-1-1) Adjusting the Position of the Trimming Cam (Insert Angle of Movable Blade)
The movable blade is started by the trimmer cam in the angle it is inserted. As one of the basic trimming
functions, it arranges the upper thread tails in the needle after trimming.
1) Adjusting the position of the movable blade
① Check if the movable blade is in the correct
position.
② Cutting point of the movable blade should be
inserted 1mm at the end of the fixed blade.
Incorrect position of the movable blade can
cause trimming errors or deviation of the upper
thread.
③ Unfasten the crank screw to adjust the location
of the movable blade (see [Fig.11-1]).
2) Adjusting the angle of the movable blade
① Unfasten two screws on the blade cam. Adjust
the upper shaft rotary angle at 290°.
② Insert the trimming cam roller into the trimming
cam. Turn the cam and when the roller aligns
with the curve of the cam, fasten the two screws
back.
③ Run the manual handle and check if the movable
blade is well-inserted at 290°. Always check
after the adjustment.
[Fig.11-1]
WARNING
Turn OFF the main power when adjusting the machine.
app.
1mm
Screw
Trimming
drive crank
Blade cam
Roller
Roller
Direction of
cam
movement
[Fig.11-2]
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