– 35 –
❸
❹
❷
❶
❷
6-2. Changing the feed timing
The feed timing has been factory-adjusted as illus-
trated in the sketch on the left.
The following describes how to change the feed tim-
ing to produce better-tensed seams from the state
given in the sketch on the right.
1) Turning pulley
❶
, remove
timing belt
❷
from the pul-
ley.
2) Turn pulley
❶
in the rotating direction of the sewing machine to lower the needle from its upper position
until it aligns with throat plate
❸
.
3) Turn hook driving shaft
❹
to raise the feed dog from its lower position until it is ush with the top surface
of the throat plate.
4) Carefully keeping the needle and the feed dog in
the aforementioned state, put timing belt
❷
on
the pulley.
5) Adjust the timing of the right and left hooks and
adjust the timing of the thread trimming cam,
referring to
"4-17. Needle-to-hook relation"
p.27
and
"6-3. Adjusting the thread trim-
ming cam" p.36.
Feed dog
Needle
Top surface of
throat plate
Align
The hook timing can change by remov-
ing/replacing the timing belt, resulting
in a stitching failure. To prevent this, be
sure to adjust the timing of the hook and
thread trimming cam.
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