The
needle
thread
trimmer
is
secured
on
brocket
Q
(Photo
23)
by
screw
e.
After
loosening this
screw,
the trimmer con
be
removed
for grinding.
When replacing the trimmer, it should be
positioned
in such o
manner
that
there
is a
clearance
of
approx.
'lit
—'/jz
between
its
bottom
surface
and
the
top
of the
work
clomp.
In
case
the trimmer should fail to
trap
the
thread
securely, loosen
both
screws
f
and
adjust
the longitudinal position of
bracket
Q.
After
the .adjust
ment, tighten the screws securely.
The
sideways
motion
of
the
needle
thread
trimmer
toward
the
thread
is
effected
by tension spring R. When depressing the left
treadle,
the spring-
loaded sprung latch U, which is carried on swing-sideways trimmer
bracket
arm
T, is
released
by the retainer V which is mounted on lifting
lever L so
that
tension spring R can
become
active
and
make
bracket
Q
Photo
24
28
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