JUKI MF-7800D Series, Engineer'S Manual

Page: 45 / 165

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1. Adjusting the height of the presser foot
Loosen adjustment nut . Lower lifter lever , adjust height
adjustment screw , and fix nut at the position where the presser
foot does not come in contact with other components.
2. Adjusting the thrust collar
Loosen setscrew in the thrust collar and adjust the clearance.
When the height of the presser foot is changed, Be sure to perform
the adjustment of the clearance of thrust collar and check the
clearance.
3. Adjusting the lifter connecting plate
For the adjustment of the clearance provided between lifter
connecting plate and hinge screw , loosen setscrew in the
lifter lever shaft when the feed dog lowers from the top surface of
the throat plate and the bottom face of the presser foot comes in
close contact with the throat plate.
o When the position of the presser
foot is too high, it comes in con-
tact with the spreader, and break-
age, stitch skipping, etc. will be
caused.
In addition, the needle tip comes
out from the sole of the presser
foot. As a result, sewing material
is damaged or needle breakage
will be caused.
o In case the clearance of thrust
collar is large, when the
presser foot gets over the
overlapped section, the presser
foot comes in contact with other
components and will cause the
damage.
o When replacing the presser foot
due to the replacement of the
gauge or the like, check the
clearance provided between
t h r u s t c o l l a r a n d l i f t e r
connecting plate .
o When the clearance of lifter
connecting plate does not
exist, not only feed force is
reduced but also components
are led to breakage since the
presser foot does not come down
to the top surface of the throat
plate when the feed dog comes
down from the top surface of the
throat plate.
o When adjusting the lever shaft,
adjust the height of lifter lever .
Adjustment Procedure Results of Improper Adjustment