4.2.9 Adjustment of needle thread tension releasing
amount
(1) Make
adjustment
so
that
when
the
thread
trimmer
solenoid is
operated,
the
tension discs
of
thread
tension regulator
open
approximately
1
mm.
(2)
To
make
adjustment,
loosen
the nuts@
and
move
the
flexible
wire.
CAUTION
If
the
opening
of
tension
discs is
too
small,
the
needle
thread
will
be
trimmed
at
short
length, leading
to
needle
thread
cast-off. Reversely, if
the
opening
of
tension
discs is
too
large,
the
tension
discs are
left
opened
continuously,
leading
to
loose
stitches.
4.3
Adjustment
of
Needle Thread Remaining Length
(1) Adjust the remaining length of needle thread by use of the
pretension
adjust
nut @.
Clockwise
turn reduces the remaining length. Counterclock
wise
turn
increases
the
length.
4.4
Cautions
on
Installation
of
Touch-Back
Solenoid
Adjust the position of solenoid in the longitudinal direction so
that
the
plunger of solenoid and the link (for connection) are
not
twisted, and make sure
that
the reverse sewing lever moves
smoothly in the vertical direction. After that, tighten the
mounting
screws.
See
Fig. 17.
4.5
Touch-Back
Pushbutton
Thefunction of pushbutton can be eliminated as required.
(1)
Normally,
this pushbutton is
used
at the position
shown
in
Fig.
18.
When
the
sewing
machine
is operated after the
pushbutton is pressed, reverse stitching is performed.
(2)
When
the
pushbutton
is
moved
to the
position
indicated
by
the
broken line in Fig. 18,
the
switch does
not
function even if
it is
pressed.
12
Thread
trimmer
solenoid
1
mm
1
mm
Fig. 15
Rg.
16
-V
Flexible
wire
Solenoid
Feed
regulating
lever
Rg.
17
Fig. 18
To Next Page
Loading...
Need help?
General
