Adjustment Of Upper Feed Roller - JUKI MS-3580 Serie Manual De Instrucciones

10. Adjustment of upper feed roller

WARNING :
Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the
sewing machine.
(1) Adjustment of upper feed roller
1) The standard clearance is 0.08mm minimum to 0.13mm maximum between the lower position of the upper feed
roller 1 and the upper face of the throat plate 2 .
The standard front/rear and right/left clearances shall be uniform between the upper feed roller 1 and the feed dog
2)
3 .
The standard positioning of the upper feed roller 1 shall be free from right and left rattling, permitting smooth
3)
movement up and down.
2
Unifi ed right and left
clearances
4
1
0.08 to 0.13mm
1
3
− 38 −
(2) Installation of upper feed roller
Raise the upper feed roller pressing shaft 4 and
1)
insert the upper feed roller pressing shaft 4 in the
frame shaft hole of the upper feed roller frame set 5 .
Then, tighten the setscrew 6 .
Simultaneously at that time, insert the lever
connecting section 8 in between the roller connecting
section 7 to join it.
Install the roller pressure adjusting screw 9 .
2)
3) Confi rm that a standard clearance (Clearance gauge:
0.08mm to 0.13mm) is secured between the upper
feed roller 1 and the upper face of the throat plate 2 .
4) Confi rm that there is proper pressure at the upper
feed roller 1 , enough to feed the material cloth.
☆ Pressure adjustment
™ Turning the roller pressure adjusting screw 9
clockwise causes the pressure to increase.
™ Turning the roller pressure adjusting screw
9 counterclockwise causes the pressure to
decrease.
1. Confi rm that the upper feed roller press-
ing shaft 4 can be raised by both hands
when installing the roller pressure ad-
justing screw 9 .
2. If the upper feed roller 1 touches the
throat plate 2 and there is too much
pressure, this will be a cause of cutting
off the chain-off thread.
3. If the clearance is too much between the
upper feed roller 1 and the throat plate
2 , this will be a cause of failure in sup-
plying the chain-off thread.
4. If pressure of the upper feed roller 1 is
too weak for the material cloth, uneven
feeding may arise.