Adjustment Procedure
Results of Improper Adjustment
11
)
Protrusion of the thread trimming shaft and stop-
per position
1. When the thread trimmer solenoid is pulled, the amount of protru-
sion is 1mm to 2mm between the tip
❾
of the thread trimming shaft
and the end plane of the bed.
(Caution) Confirm that a clearance is secured between the cam
follower piece
❼
and the end plane of the thread
trimming cam
❸
to 2mm. (Refer to 3.-(9)-1).)
◦ If the amount of protrusion is too
small, the action sound of the
thread trimmer becomes large.
◦ If the amount of protrusion is too
large, the amount of picker action
becomes small and the lost motion
of bobbin may occur.
(If the amount of protrusion is too
excessive, short cutting of the
needle thread may arise. This is
because the needle thread is dis-
engaged from the picker.)
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