t
1
I
[I]
NEEDLE
AND
ROTARY HOOK
TIMING
ADJUSTMENT
1.
Clearance between needle and rotary hook point
Needle
Rotary hook
pornt
Should
touch lightly
0.05-0.1
mm
( 1) Loosen
screws®.
®and
©.
and adjust the clearance between the needle and the rotary hook point
to
somewhere
between
0.05
and 0.1 mm by moving rotary hook 8
to
right
or
left.
(2) After adjusting the clearance between the needle and the rotary hook point. adjust the needle guard so that the needle
and the needle guard lightly touch each other.
• After the adjustment. securely tighten
screws®.®
and
©.
The needle guard on the rotary hook is to prevent
the
needle from striking the rotary hook point.
•
Be
sure
to
readjust the rotary hook needle guard position when replacing the rotary hook.
2.
Needle bar
rise
and height
Rotary hook
point
Needle bar rise
\:
·.....----'-
r
Needle
1.5
mm
(8837)
2.2
mm (8838)
( 1) Turn the feed adjusting knob
to
position
0.
8
(2) Loosen screws 8 for lower shaft spiral gear
8.
and move lower shaft spiral gear 8 to the right
or
left so that the rotary
hook point
will be at the center line of the needle
when
the needle rises 2.4 mm with
883
7.
2.8 mm
with
8838
from its
lowest position.
• The rotary hook shaft has a screw seat.
so
the above adjustment cannot
be
made with the pinion gear.
• When tightening screws 8 for lower shaft spiral gear
8.
make sure that it is in line with the screw seat.
Needle bar height
(1)
Turn the feed adjusting dial
to
position 0
{8837)
or 4
(8838).
(2) Loosen screws
8.
and move the needle bar up
or
down to adjust the clearance between the top
of
the needle eye and
the rotary hook point
to
1.5 mm
(8837)
or 2.2
mm
(8838). when the rotary hook point is in line
with
the center of
the
needle.
•
After the adjustment. tighten screw 8 securely.
Model
Application
Needle bar rise
Feed
control
dial
Standard Thread cutter Standard
Thread cutter
118-837
Thick materials
2.4
mm
2.4
mm
0
0
1
18-838
Thick materials
2.8
mm
----------
0
-------
-61-
From the library of: Superior Sewing Machine & Supply LLC
To Next Page
Loading...
