JUKI LH-4128-7 Engineer's Manual page 55

1) Auto-back
1. Set the stitch dial at the maximum value on the scale.
2. Lightly press reverse feed control lever
. At this time, a clearance of 0.5 ± 0.2mm should be provided
feed link
between reverse feed control lever
3. If the clearance deviates from the range of 0.5 ± 0.2mm, loosen the
screw and make the reverse feed lever
feed link . Adjust the clearance between the reverse feed lever
and the back lever stopper
.
(Caution) When the screw
do not move the feed adjusting base in the axial direction
of reverse feed control lever
adjusting base against the reverse feed control lever. In
this case, stitching troubles such as reduced stitch length
for the reverse feed stitching will occur.
Adjustment Procedure
down until it meets reverse
and back lever stopper
to 0.5 ± 0.2mm and tighten the screw
in the feed adjusting base is loosened,
. This will push the feed
.
coincide with the reverse
– 51 –
Results of Improper Adjustment
If the clearance provided between
the back lever stopper and the re-
verse feed control lever is 0 (zero):
o This can be a cause of vibration
sound from the reverse feed le-
ver .
o Stitch length will be shortened.
If the clearance provided between
the back lever stopper and the
reverse feed control lever is 0.7mm
or more:
o Stitch length will be reduced
when performing reverse feed
stitching.