JUKI MO-6000S series Engineer's Manual page 35

Adjustment Procedures
1) Remove the upper cover, loosen setscrew 2 in upper knife
driving arm 1, and turn upper knife shaft 3 to adjust the position
from the top surface of the throat plate to 34 mm.
(Caution) Be sure to fully tighten the setscrew since upper
knife shaft 3 is subjected to high load.
1) Lower knife
1 Adjust the vertical position of the lower knife by screw 1 so
that the blade top aligns with the top surface of the throat plate.
2 Tighten screw 2 after bringing the upper knife to its lowest
position of its stroke.
2) Upper knife
1 Adjust the position of the upper knife by screw 4 so that the
engagement with the lower knife is 0.5 to 1 mm when the upper
knife is in the lowest position of its stroke.
(Caution) Adjust the lateral position of the lower knife by screw
2. Adjust the lateral position of the upper knife by screw
3. After performing adjustment, be sure to fix the knife.
Otherwise, the durability of the knife will be affected.
3) Overedging width
1 Adjust the overedging width in the following way :
Laterally position the upper knife before loosening screw 2.
Tighten screw 2 when the upper knife has settled by itself
under the pressure applied by the spring. Repeat this
adjustment procedure to obtain desired overedging width.
Results of Improper Adjustment
™ Improperly positioned upper
knife arm shaft will come in
contact with the frame.
If it is moved with the position of
the upper knife unchanged,
proper engagement of the
k n i v e s w i l l b e d i s t u r b e d ,
prohibiting sharp cutting of the
knives.
™ The lower knife, if positioned too
high, will catch materials or
cause no contact of the presser
foot with the throat plate top
surface.
™ If the lower knife is positioned
too low, the cutting width will be
changed or materials will be
caught by the lower knife.
™ The upper knife, if positioned too
high, will fail to cut materials.
™ Unsharp cutting or abnormal
wear on the knives will result
unless the lower knife is laterally
positioned and fixed at a position
where it has settled by itself
under the upper knife spring.
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