−
56
−
@3
@2
Adjustment Procedures
Results of Improper Adjustment
™
Incorrect adjustment could
c a u s e a b n o r m a l w e a r o f
mechanism of thread trimmer or
failure of thread trimming by
insufficient stroke.
™
The speed of the forward travel of movable knife is reduced by
turning the screw of speed controller
@2
clockwise and increased
counter-clockwise.
™
The speed of the backward travel of movable knife is reduced
by turning the screw of speed controller
@3
clockwise and
increased counterclockwise.
After making adjustment of thread trimmer, thread the machine
and try to sew and cut off the electric power in a state that the
needle bar is situated at the top dead point to disable the operation
of the sewing machine and push on the solenoid to confirm the
following.
™
Movable knife passes through the needle thread loop
@4
and
makes the looper thread
@5
bent.
™
Movable knife starts moving backward after it reaches the end
of the left travel, when the looper thread is caught in
@6
section
of movable knife while the needle thread is caught in
@7
section
and cut by stationary knife and the looper thread only is retained
by the clamp spring.
New type
Old type
@3
@2
From
the
library
of:
Diamond
Needle
Corp
