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Adjustment Procedures
1) Height of main feed dog
1. Apply the rear support screw
dog
, tighten the setscrew
2. Check the standard height of the main feed dog.
o If the main feed dog
o If the main feed dog
3. Remove the throat plate
main feed dog
, and adjust height of the front support screw
4. After adjustments, mount the main feed dog
, mount the throat plate
2) Adjustment of longitudinal movement of main feed dog
1. Loosen the setscrews (
.
2. Using a screwdriver, turn the eccentric pin
counterclockwise until the front and rear positions of the main feed
dog
are properly adjusted.
to the bottom right of the main feed
, and mount the throat plate
is low, raise the rear support screw
is high, raise the rear support screw
, loosen the setscrew
, tighten the setscrew
, and tighten the setscrew
and
) and remove the plug female screw
Results of Improper Adjustment
When the height of main feed dog
.
o The amount of feed is decreased
.
o When the height of the rear
.
to remove the
.
When the height of main feed dog
.
o This can be a cause of the
clockwise and
o When the height of the rear
– 27 –
is insufficient
and uneven feeding can occur.
needle guide is lowered, this will
cause breakage of a needle or
stitch skipping.
is excessive
materials pushed back to the front
side, or of giving rise to feed flaws.
needle holder is raised and the
margin of the needle contact
position is increased, this will
cause failure in producing loops
and stitch skipping.
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