When the left treadle is pressed down, both knives continue to swing forward,
and
the
needle
thread
loop
and
the
bobbin
thread
are
pulled
onto
the
tapering back
edge
of the respective knife and
are
cut.
When the treadle is released, the knives return to the stand-by position where
they remain during the first four stitches of the next tack. At the completion
of these stitches they
are
automatically returned to the inoperative position
by the knife
cam.
'/32"-Vl6"
22
7-8mm
Needle
thread
Bobbin
thread
Edge of
shuttle
race
Bobbin
thread
knife
Needle
thread
knife
Fig. 13 Inoperotive position of knives
Fig. 14
Stand-by
position of knives
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