Thread
trimnning
cam
Cam
roller
Cam
roller
shaft
arm
set
screw
Rotational
direction
Rotate
cam
in
this
direction
with
hand
Thrust
collar
Set
screw
Green (6)
2)
How
to
match
the timing
of
the
thread
trimming
cam
First, loosen the 2 set screws
of
the
trimming
cam
in
order
from
set screw
No.l
and
No.2,
and
match
the indicating line
of
the
arm
with
the indicating line
of
the
hand
wheel.
(For
cotton
thread, match red color ® with the red color (5) and for synthetic thread, red color ® with
the green color
®).
Then, by pushing the sewing hook presser @ to right, interlock the cam and the cam roller,
and
without
rotating
the
hook
shaft,
rotate
the cam
only
toward
the
reverse
direction
than
the normal
hook
shaft rotational direction with
your
finger tips. At the position where the
cam does
not
rotate
any more, push the cam against the
thread
trimming cam
thrust
collar
and
finally
tighten
the
cam
set screws in
the
order
of
No.2
and
No. I.
15.
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., when
the
tip
of
the
moving
knife
has
retreated
to
2~2.5mm
(1/6-^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.
•2.5mm'
Needle
Moving
knife
-
15
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