−56 −
@3
@2
Adjustment Procedures Results of Improper Adjustment
™ Incorrect adjustment could
cause abnormal wear of
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
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