JUKI 35800 Series, Engineer'S Manual

Page: 37 / 61

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1. Installation of upper feed roller
(1) Raise the upper feed roller pressing shaft and insert the upper
feed roller pressing shaft in the frame shaft hole of the upper
feed roller frame set . Then, tighten the setscrew .
Simultaneously at that time, insert the lever connecting section
in between the roller connecting section to join it.
(2) Install the roller pressure adjusting screw .
(3) Confirm that a standard clearance (Clearance gauge: 0.08mm to
0.13mm) is secured between the upper feed roller and the upper
face of the throat plate .
(4) Confirm that there is proper pressure at the upper feed roller ,
enough to feed the material cloth.
c
Pressure adjustment
o Turning the roller pressure adjusting screw clockwise causes the
pressure to increase.
o Turning the roller pressure adjusting screw counterclockwise
causes the pressure to decrease.
(Caution) Confirm that the upper feed roller pressing shaft can
be raised by both hands when installing the roller
pressure adjusting screw .
2. Clearance adjustment between upper feed roller and throat plate
(1) If the standard clearance adjustment seems to be improper, loosen
two setscrews and raise the upper feed roller pressing shaft .
Insert the clearance gauge in between the upper face of the throat
plate and the lower position of the upper feed roller . Then,
lower the upper feed roller pressing shaft .
(2) Tighten two setscrews under the condition that the bottom face
of the guide finger is put on to keep contact with the upper face of
the guide support block .
(3) In the state as seen from behind, confirm that the vertical clearance
of the upper feed roller is maintained at the standard level in
conjunction with the throat plate
(4) In the state as seen from behind, confirm that the front and rear
right/left clearances on the right side of the upper feed roller are
uniformly maintained in conjunction with the feed dog .
(Caution) The right/left clearance between the upper feed roller
and the feed dog shall be confirmed while the
feed dog is positioned at the highest level.
3. Adjustment of parallelism between upper feed roller and feed dog
(1) Loosen the setscrew and turn the upper feed roller pressing shaft
to the right and left to confirm that uniform clearances are retained
in front / rear and right / left positions between the upper feed roller
and the feed dog . Since then, tighten the setscrew .
4. Adjustment to eliminate right and left rattling in the upper feed roller
(1) If there is right and left rattling in the upper feed roller , loosen the
setscrew and hold the guide finger to eliminate right and left
rattling, using the right/left guide plate . Since then, tighten the
setscrew .
o If the upper feed roller touches
the throat plate and there is too
much pressure, this will be a
cause of cutting off the .
o If the clearance is too much
between the upper feed roller
and the throat plate , this will
be a cause of failure in supplying
the
o If pressure of the upper feed roller
is too weak for the material
cloth, uneven feeding may arise.
Adjustment Procedures Results of Improper Adjustment