S-7300A
Lowest position of
needle bar
<Thread trimming cam position adjustment>
1. Turn the machine pulley to raise the needle bar 6 mm
from its lowest position (reference line (a) position) so
that reference line (b) is aligned with the bottom edge of
the needle bar bush.
2. At the above position, push the plunger (1) of the thread
trimming solenoid with your finger in the direction of the
arrow.
Adjust the position of the thread trimmer cam (2) at this
time so that the roller shaft (4) of the thread trimming cam
lever assembly (3) touches the hollow (c) of the thread
trimmer cam (2) and so that the clearance between the
edge of the thread trimmer is 0.6 to 0.8 mm. (Fig. A)
3. Check that the clearance between the edge of the thread
trimmer cam (2) and the roller shaft (4) is 0.5 mm when
the roller shaft (4) returns to the right. (Fig. (B))
* Tighten the two set screws (5) to approximately 4 N.m.
Direction of cam
rotation
b)
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