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Adjustment Procedures
Adjustment of main feed dog and differential feed dog
1. For the feed rocking lever eccentric pin
standard positioning of the driver groove is horizontal.
If the driver groove seems to be inclined deviating from the standard
positioning, loosen the setscrew
eccentric pin
of the feed dog until it assumes its horizontal posture.
Since then, tighten the setscrew
2. Mount the main feed dog
plate
, and fix the throat plate
3. In the first place, adjust the height of the main feed dog
standard position. Then fix it by tightening the setscrew
4. Apply the feed dog support
the main feed dog
5. Then, adjust the height of the differential feed dog
position. After that, fix it by tightening the setscrew
6. According to "(10) Feed adjustments, 1) Adjustment of stitch length",
adjust the maximum feed amount of the main feed dog
(Apply a ruler to the side of the main feed dog
result by turning the pulley counterclockwise.)
7. Turn the pulley counterclockwise and confirm that there is no contact
between the main feed dog
of the throat plate
If there is any contact, loosen the setscrew
rocking lever link
stud
to adjust the throat plate
front/rear section. After adjustments, tighten the setscrew
8. After the front and rear momentum amount has been adjusted for
the main feed dog
of 3.2mm.
(Caution) 1. In the case of front and rear adjustments of the
differential feed dog mechanism, specific attention
should be paid to the fine feed dog section of the
main feed dog
2. To make front and rear adjustments of the main feed
dog
, loosen eight setscrews
cover and remove the cylinder cover set
After adjustments, mount the cylinder cover set
and tighten the setscrews
3. For the main feed dog
dog
horizontality are kept constant and cannot be
adjusted.
and adjust the feed rocking lever
.
, differential feed dog
.
to the bottom of the front section of
and tighten the setscrew
and the feed groove front/rear section
.
and turn the main feed rocking eccentric drive
not to contact the feed groove
, adjust the sewing length to the standard value
.
.
and the differential feed
, the longitudinal gradients and the
of the feed dog, the
and throat
to the
.
.
to the standard
.
to 3.6mm.
and confirm the
of the main feed
.
of the cylinder
.
,
– 25 –
Results of Improper Adjustment
When the height of feed dogs
is insufficient
o The amount of feed is decreased
and uneven feeding can occur.
o When the height of the rear
needle guide is lowered, this will
cause breakage of a needle or
stitch skipping.
When the height of feed dogs
is excessive
o This can be a cause of the
materials pushed back to the front
side, or of giving rise to feed flaws.
o When 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.
,
,
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