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1) Height of main feed dog
1. Apply the rear support screw to the bottom right of the main feed
dog , tighten the setscrew , and mount the throat plate .
2. Check the standard height of the main feed dog.
o If the main feed dog is low, raise the rear support screw .
o If the main feed dog is high, raise the rear support screw .
3. Remove the throat plate , loosen the setscrew to remove the
main feed dog , and adjust height of the front support screw .
4. After adjustments, mount the main feed dog , tighten the setscrew
, mount the throat plate , and tighten the setscrew .
2) Adjustment of longitudinal movement of main feed dog
1. Loosen the setscrews ( and ) and remove the plug female screw
.
2. Using a screwdriver, turn the eccentric pin clockwise and
counterclockwise until the front and rear positions of the main feed
dog are properly adjusted.
When the height of main feed dog
is insufficient
o The amount of feed is decreased
and uneven feeding can occur.
oWhen the height of the rear
needle guide is lowered, this will
cause breakage of a needle or
stitch skipping.
When the height of main feed dog
is excessive
o This can be a cause of the
materials pushed back to the front
side, or of giving rise to feed flaws.
oWhen the height of the rear
needle holder is raised and the
margin of the needle contact
position is increased, this will
cause failure in producing loops
and stitch skipping.
Adjustment Procedures Results of Improper Adjustment
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