30
This sewing machine is run by the thread trimming driving method, which uses the cam attached to the lower shaft as
driving force. Thus, if you rotate the machine with the thread trimming solenoid is in operation in time of the machine
adjustment, the moving knife collides with the needle causing harms on the both parts. So, when you run the machine
with the solenoid in operation, run only in the regular thread trimming course (down stop ~ up-stop of the needle bar).
Caution
8.11) Adjusting feed cam
The timing of the feed dog and the needle is determined by moving vertically the feed cam
④
. First, turn the pulley with
hands to fix the needle bar to the highest point. The standard position will be when the center of the No. 1 fixing bolt
②
of
the presser foot vertical move cam
①
is aligned with the center line of the upper shaft
③
, the bottom of the No. 1 fixing bolt
⑤
of the feed cam
④
is aligned with the center line of the upper shaft
③
.
[Fig. 8-12]
8.12) Adjusting for thread trimmer
A. Structure of thread trimmer
The structure of the thread trimmer of this machine is as follows in Figure 8-13:
[Fig. 8-13]
①
③
②
④
⑤
slide arm
thread
trimmer cam
thread trimmer
solenoid base
thread trimmer
solenoid
stopper
thread release
table
thread trimmer
lever
thread trimmer
following crank
movable
knife
fixed blade
stopper
lever
clutch
lever
thread cover
Summary of Contents for KM-1640BL-7
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