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8
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ADJUSTING THE FEED DOGS & STITCH LENGTH
SX6803PD (Differential feed)
8-1 To install and adjust the feed dogs
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Position of the feed rocker arm eccentric pin
Eccentric pin A which is located at the middle of the
cylinder is used for a fine height adjustment on the
main and differential feed dogs.
Before installing the main and differential feed dogs,
set the groove on the eccentric pin in a vertical
position and then fasten the eccentric pin with screw
B. The above adjustment should be made in order
to raise the main and differential feed dogs
simultaneously (the extreme rear ends of these feed
dogs must be 2.5mm raised).
Assemble eccentric pin A so that the feed dogs can
be raised by turning eccentric pin A clockwise.
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To assemble the feed dogs
1.
Install feed dog C with screw D.
2.
Fit feed dog support E onto feed dog C and
tighten screw F.
3.
Fit differential feed dog G slightly onto feed dog
C and tighten screw H.
4.
Check to see if the machine pulley turns easily
with differential feed effective.
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Feed dog height
When the main feed dog is in its highest position,
the first tooth from the front should be 1.5mm above
the needle plate. Adjustment is made by loosening
screws D, F and H.
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Position of the feed rocker arm
If the feed dogs touch the slots of the needle plate at the front or back, adjust the position
of the feed rocker arm. Adjustment is made by loosening screw I, turning eccentric pin J
and moving feed rocker arm K front or back as required.
To turn eccentric pin J, tap the V groove on the brim of the pin with a tapered tool.
After this adjustment, secure feed rocker arm K and feed link L with screw I while
checking there is no play on these parts.
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