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w
t
u
3. Then, when the feed mechanism moves forward, the cam w that is secured to the feed arm q moves in the
direction of the arrow (forward) and moves the back plate e in the direction of the arrow (forward).
4. When the back plate e and the stop plate r lock together and clamp the upper thread trimmer lever t and the
stop plate r separates from the back stopper y, the upper thread trimmer lever t is pulled in the direction of the
arrow by the spring u, and the upper thread trimmer assembly i changes from the condition in Figure A to the
one in Figure B and the upper thread trimmer opens fully.
q
e
r
y
LH4-B800E
1. MECHANISM DESCRIPTION
Figure A
u
Figure B
y
t
r
e
w
q
i
i
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Table of Contents
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