−8 −
Adjustment Procedures Results of Improper Adjustment
1. Adjust the timing of feed rock triangle cam 1 to the position
where the feed dog does not move even moving the reverse
feed lever up or down when the 4th engraved marker line
(lowest marker line) is aligned with the bottom end of the metal
when the needle bar comes down.
2. Loosen two setscrews 2 in feed rock triangle cam 1.
3. Turn the handwheel with feed rock triangle cam 3 fixed in the
normal rotational direction to retard the feed timing, or in the
reverse direction to advance the feed timing.
4. Install feed rock triangle cam 3 so that the edge of feed rock
rod 3 comes in contact with feed eccentric cam side plate 4
of feed rock triangle cam 1.
(Caution) Turn the main shaft and check that there is no skew
between feed rock rod 3 and feed eccentric cam
side plate 4.
5. To adjust the timing of feed driving cam 5, stop the cam at the
position where the top surface of the feed dog is aligned with
the top surface of the throat plate when the top end of needle
eyelet of the sewing needle is aligned with the top surface of
the throat plate while the needle bar descends. (Alignment of
three points)
6. Loosen two setscrews 6 in feed driving cam 5.
7. Turn the handwheel with feed driving cam 5 fixed in the normal
rotational direction to retard the timing of the vertical movement,
or in the reverse direction to advance the timing.
™ When loop is not tightened in
overlapped section sewing,
retard the feed timing. Then feed
tightening is applied and loop is
tightened.
™ If the timing is excessively
advanced or retarded, the
sewing product is fed when the
needle is pierced. As a result,
needle breakage, bend of
spreader, etc. will occur.
™ When the timing between feed
rock triangle cam 1 and feed
driving cam 5 is not proper,
return is applied to the feed dog
at the end of feed or at the start
of feed. As a result, stitch
skipping will be caused.
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