JUKI MEB-3200 Engineer's Manual page 51

Adjustment Procedures
5) Adjusting the position of the upper knife lower cover
1. Loosen two setscrews ! 1 and move upper knife lower cover ! 4
to adjust the position.
2. Adjust the cover so that the blade top of upper knife 5 is hidden
by 0 to 1 mm. At the same time, move upper knife lower cover
!4 in the direction of arrow mark F and slightly place the slope
section to corner section E of lower knife 1. At this time, the
top end section comes in close contact with the bottom face of
upper knife 5. Slightly correct the upper knife lower cover when
the top end section does not come in close contact with the
bottom face of the upper knife.
* When lower knife 1 rotates (in the direction of arrow mark
G), upper knife lower cover ! 4 bends downward (in the
direction of arrow mark H) at corner section E and presses
the thread downwrad. By this operation, looper thread and
gimp can be securely trimmed.
3. Fix setscrews !1 .
4. Check the knife motion. In addition, make sure that upper knife
lower cover !4 is not caught on the throat plate when the feed
base moves back and forth.
(Caution) Be sure to adjust the cover when setscrews !1 are
removed and the knife is removed together with the knife
unit in case of the replacement of presser set or the like.
Results of Improper Adjustment
™ When the blade top of upper
knife comes out from the upper
knife lower cover, the length of
remaining thread will be longer
or unstable.
™ When the slant face section of
upper knife lower cover is
detached from corner section E
of lower knife, the cover is
caught on the throat plate when
the feed base moves back and
forth.
™ When the slant face section of
upper knife lower cover comes
in strong contact with corner
section E of lower knife, a
clearance is provided between
the top end section and the
upper knife and the cover is
caught on the throat plate when
the feed base moves back and
forth.
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