Photo
31
To turn the
hook
on- the hook
shaft
until it is in the position
described
above (point of hook about
^44"
above top of needle eye), loosen both set
screws
b(
and
bj (Photo 26).
The
needle
bar
is
set
at
the
correct
height
when
the
bottom
of
the
needle
eye is flush with the top edge of the needle guard while the needle
bar
is
at
the
lowest
point
of
its
stroke.
The
sideways
adjustment should be
made
with particular
care
so as to
ensure
that
there
is a
clearance
of
about
.004"
(0.1
mm)
between
the
point of the hook
and
the needle.
In
order to exchange the hook, loosen both set screws c, and
Cj
on the
hook
shaft
collor (Photo 26), remove bobbin
case
position
bracker
C,
and
pull
the hook forward out of its mount on the shaft. To save lengthwise
readjustment of the position
bracket,
it is
advisable
to remove
same
together
with its
base
by loosening screws d,
and
dj.
35
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