For
properly
setting
the
bobbin
thread
trimmer it should be
noted
that
both
blades
should
overlap
about
.04" in their final position. To
adjust,
loosen
screw
n (Photo 26)
and
turn the
crank
as
may
be
appropriate.
When
exchanging
blade
1,
make
sure
that
the cutting
edge
of
the
new
blade
is
approx.
—Vu"
away
from
the
needle
hole in
order
to
prevent
injury to
the
needle
thread.
The
compact
disposition of the trimmer mechanism on the underside of the
needle
plate
facilitates removal in
case
the knives need grinding. Simply
loosen
screw
o (Photo 26)
and
the
needle
plate
set
screw.
When
replacing
the
mechanism,
make
sure
that
the
bobbin
case
position
lug
properly
enters
the
slot
of
the
bobbin
case
position
bracket.
24.
Pulling
OK
the
Needle
Thread
and
Releasing
the
Top
Tension
To
avoid
unthreading
of
the
needle,
the
amount
of
thread
needed
for the
first stitch
of
the
next
buttonhole
must
be
pulled
off
by
the
top
tension
Sp, prior to cutting the needle thread. This action is
performed
by pull-off
pin p which is
mounted
on lug q,
and
carried
on tension
release
lever q
(Photo
27).
Photo
27
Upon
starting the
machine
by pressing down the right treadle, the
hinged
stop
motion
lever 1
(Photo
28)
actuates connecting rod s and
tension
release
lever q whose upper end moves forward to release the pulled-off thread.
Simultaneously, the
top
tension Spi is
engaged.
31
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