Adjustment Of Looper Thread Cam - JUKI MS-3580 Serie Manual De Instrucciones

12. Adjustment of looper thread cam

WARNING :
Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the
sewing machine.
(1) Adjustment of looper thread cam
The standard positioning is secured when the pulley 1 is turned counterclockwise and the fi rst setscrew 3 of the looper
thread cam 2 and another fi rst setscrew 4 of the pulley 1 are aligned to the same line.
When two main shaft setscrews 4 and 5 of the pulley 1 are turned counterclockwise, the fi rst screw
functions as the main shaft contact setscrew 4 .
5
1
Same
line
Rotating
direction
4
6
Looper thread cam
adjustment and peep
window
7
8
2
3
− 42 −
(2) Adjustment of looper thread cam
Open the center top cover 6 , loosen the setscrew 7
1)
, and remove the cam thread path base 8 .
Turn the pulley 1 counterclockwise and confi rm
2)
whether the fi rst looper thread cam setscrew 3 stays
on the same line with the fi rst setscrew 4 of the
pulley 1 .
If the looper thread cam setscrew 3 seems to be
displaced, loosen two setscrews 4 and 5 and turn
the looper thread cam 2 forward and backward for
adjustment. Then, tighten the setscrew 4 .
Subsequently, tighten another setscrew 5 .
At the time of looper thread cam 2 adjust-
ments, do not move the looper thread cam
2 to the right and left.
If it is moved to the right and left, the looper
thread cam 2 may come in contact with the
right/left side face of the cam thread path
base 8 groove.
Install the cam thread path base 8 so that it does not
3)
touch the right and left faces of the looper thread cam
2 . Then, tighten the setscrew 7 .
1. The looper thread cam 2 can be adjust-
ed through the peep window. However,
since the inside is dark, a proper light
(pen light or the like) should be used
during adjustments.
2. If the standard position is not secured
for the looper thread cam 2 , this can
be a cause of stitch skipping.