Changing The Feed Timing - JUKI LH-3500A Series Instruction Manual

6-2. Changing the feed timing

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 flush with the top surface
of the throat plate.
❸
❷
– 35 –
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
❶
❷
Needle
Feed dog
❹
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.
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.
timing belt ❷ from the pul-
ley.
Top surface of
throat plate
Align