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32
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[Locus and timing of the feed dog]
☆
Locus of feed and feed driving timing in terms of the
needle can be changed by loosening setscrew (10)
in feed driving cam (9).
*
Standard adjustment value is the state that marker
dot (7) is aligned with marker dot (8) in the center.
★
Loosen setscrew (9) in feed driving cam (10) and turn
it to this side (direction C), and adjust the marker line
to “-” side (Fig. A). Then, feed driving timing in terms
of feed rocker is advanced. Change in the horizontal
direction at the start of feed is decreased and the
fabric is securely fed resulting in decrease of irregular
stitches.
•
Feed force is slightly decreased since the feed
dog near the end of feed lowers faster.
★
Loosen setscrew (9) in feed driving cam (10) and turn
it to the front side (direction D) , and adjust the marker
line to “+” side (Fig. B). Then, feed driving timing in
terms of feed rocker is delayed. Start of feed is smooth
and light-weight materials become hard to be
damaged although bite to the fabric is slightly
deteriorated. In addition, the feed dog securely feeds
fabric at the end of feed and puckering is reduced
due to puller effect.
(9)
(10)
(7)
(8)
(7)
(8)
(7)
(8)
(Caution) Whenever the timing of feed driving cam (9) is changed, the feed timing in terms of the needle
will be changed.
When the timing of feed driving cam is excessively changed, readjust it referring to [Adjusting
the needle and feed timing].
Standard adjustment
Right above around here
Fig. A
Fig. B
(Reference for the position of the feed driving shaft in terms of the needle bar)
Whether the timing of the needle and the assembling position of the feed driving shaft are in the normal position
can be checked by the following manner.
◎
When “+1” to “+3” of the marker line are positioned right above in the state that the marker line at the top end of
feed driving shaft is adjusted to the “0” position of the feed driving cam plate when the needle bar is brought to
its upper dead point, the position is normal although it is slighly different by the adjustment of timing.
* Reference for the position of the
feed driving cam at the needle
bar upper dead point
