–
19
–
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
❶
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
❶
to
❷
on needle bar.
(
❶
Lower dead point,
❷
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 (#14)
Top surface of throat plate
0±0.2 mm
Hook
❷
❶
❶
Vertical feed shaft arm
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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