4. Height of feed dog
™
Set stitch dial to 2 and bring feed dog to its high-
est position.
™
See the height on the rear side of feed dog.
™
Bottom of tooth of feed dog should be aligned
with top surface of throat plate.
(Figure on the right side : protruding amount from
top surface of throat plate is 1.2±0.1 mm.)
™
Perform adjustment with
1
vertical feed shaft
arm.
5. Feed timing
™
Set stitch dial to P=2.
™
Lower feed dog in the normal feed operation and align it with top surface of throat plate.
™
At this time, clearance provided between needle top and top surface of throat plate is 0±0.2 mm.
™
Perform adjustment with feed cam setscrew.
6. Needle-to-hook timing
™
Loosen three setscrews in hook.
™
Adjust blade point of hook and left edge of needle
to 0 to 0.2 mm when needle bar lifts by 2.17 mm
from its lower dead point.
™
Check clearance between needle and hook, and
tighten setscrews.
Remove bobbin case positioning finger to im-
prove the work.
Standard of position of 2 mm from lower dead
point of needle bar is that of engraved lines
1
to
2
on needle bar.
(
1
Lower dead point,
2
Position of lifting 2 mm)
7. Clearance between needle and hook
™
Loosen three setscrews in hook.
™
Adjust blade point of hook to position of 0.2 mm
from left edge of needle.
™
Adjust clearance between blade point of hook
and needle to 0.02 to 0.07 mm.
™
Temporarily tighten setscrews, check timing, and
securely tighten setscrews.
0 to 0.2
Needle
Blade point
Top surface of throat plate
1.2±0.1 mm
Feed cam setscrew
Needle (HA x 1 #14)
Top surface of throat plate
0±0.2 mm
Hook
2
1
1
Vertical feed shaft arm
2
Shaft arm setscrew
0 to 0.2
1.33 mm
0.02 to 0.07 mm
Lifting amount
2.17 mm
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