13. How to select the presser foot,
throat
plate, sewing hook and feed dog
1) Ptesser foot: Select small a and b parts.
1)
Presser
foot
2) Throat plate
(
n
nz
Na
2)
Throat
plate: Select small needle eye and
A
part.
3) Needle: Finer needle for less thread slip
page.
4) Sewing hook: Automatic lubricating
hook
with
a groove.
5)
Feed
dog: If a feed dog which is
common
ly used is adopted, there is no problem,
but
if an extremely thick feed dog is used,
the backside of the dog teeth might be
.scratched when the moving knife moves
fully.
14. Adjusting
the
timing of
the
thread
trimming cam
1) How to Judge the correct timing of the
trimming cam
In
order
to change
the
length
of
the
thread
remaining
at
the needle eye after trimming,
adjust the timing
of
the thread trimming
cam.
This
can be
done
easily by
matching
the
arm
with
the
indicated
line
on
the
hand
wheel, according to the
kind
of
thread
used-cotton
or
synthetic
thread.
Tilt
the
machine,
turn
the
hand
wheel
with
your
hand
until
the
thread
take-up
comes
Just
before
the
upper
dead
point
and
if
the
sewing hook presser (D is pushed deeply
to right,
the
cam
roller
will
enter
the
cam
groove
of
the
cam
and
will be
interlocked
there.
In
that
condition,
rotate
the
hand
wheel
in
the
reverse
direction
than
the
conventional
way,
and
the
hand
wheel
will
come
to a
point
where it will
not
rotate
any
more. At this
point
if cam timing is
matched
so
that
the
indicated
line
of
the
arm ®
and
the indicated line
of
the
hand
wheel (f) are matched together as shown
in the fig., it becomes a
cotton
thread
timing.
But if the indicating line 0 is
matched with the indicating line
®,
it
becomes a timing for
synthetic
thread.
DLD-432-4
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14
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