2.
Adjusting
the
position
of
the
moving
knife
1)
The
correct
position
of
the
moving
knife
when
it
has
moved to
its
maximum
range is, as
shown
in Fig.l9,
when
the tip of the
moving
knifehasretreated to 2~2.5mm(l/6"~3/32")
from
the
center
of
the
needle.
When
the
retreated
range
is less
than
this
position,
it
cannot
scoop
up
the
needle
or
bobbin
thread
at
the
trimming
instant,
while
if
it's
too
much,
the
feed
dog
and
the
moving
knife
might
hit
each
other.
Therefore,
it is
very
important
to
match
the
position
of
the
moving
knife
correctly.
Green
2
~2.5mm
Needle
Moving
knife
Fig. 19
Fig. 18
2) How to match the position of the moving knife
This is adjusted by changing the right or left position of the moving knife shaft (Fig.20
®)
when the machine stops. By this adjustment, the interlocking of the cam and the cam roller also
changes, so match the position
of
the thread trimming cam toward the shaft direction, also.
a. First, loosen the magnet set screw (Fig.20 (D and pull
out
the magnet link pin (Fig.20 (D).
b. Move the magnet link (Fig.20 (£)) downwards and adjust the .screwed-in
amount
of the knife
moving shaft adjusting nut (Fig.20 (D). If this nut is screwed in deep, the retreating range of
th the knife becomes greater and if it's loosened, the range gets less.
c. Loosen
both
set screws of trimming cam
(7)
and the thrust collar (6).
d. Match the indicating line of the hand wheel with the indicating line of the arm.
(In case of cotton thread, match (D with
(2)
of Fig.18 and for synthetic thread, match (D with
(3))
e. Rotate the set screw No.2 (Fig.20
®)
(indicated point) of the trimming cam so that it comes to
front and when it comes to front, push the sewing hook presser to right.
f. Move
the
cam to right and left
and
interlock
the
cam
and
the
cam roller.
g. With this condition, as you pull the cam to right, move it toward teh arrow direction until the
cam
cannot
rotate
anymore.
h.
Temporarily
tighten
the
set
screw
No.2
(D
of
the
cam.
i.
Tighten
the
lock
nut.
(Fig.20
(D)
j. At this
point,
verify
the
following:
(D
Is the indicating line of the pulley matched?
(2)
Is
the
roller inserted smoothly into the cam groove?
(D Is the retreated range of the moving knife 2~2.5mm?
k. Tighten the two set screws
of
the cam securely.
1.
Push the thrust collar against the cam and tighten the two set screws,
m. Attach the magnet link pin in its original position.
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17
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