JUKI LH-4128-7 Engineer's Manual page 53

1. Loosen the screw
clearance of 1.1±0.2mm is secured between the wiper base
the presser bar metal
2. Move the feed adjusting dial to MAX position.
3. Align the white engraved marker dot of the hand wheel to the en-
graved marker line of the pulley cover and move the wiper
Loosen the screw
again when the clearance has been adjusted to 2 to 3mm while the
wire tip comes closest to the tip of the wiper
4. Confirm that a clearance of more than 0.7mm is secured when the
pulley is turned and the wiper
A
1. Set the stitch dial to the max. value on the scale.
2. Loosen two screws
3. Press the reverse feed control lever
plunger in the direction of the arrow. Adjust the clearance to 0.5 to
1mm between the rubber washer
surface of the reverse feed solenoid
* This adjustment should be carried out after confirming that
adjustments have been finished as per (15) Initial position of the
reverse feed control lever.
Adjustment Procedure
and then tighten it in the position where a
.
to adjust the wiper
comes closest to the needle clamp.
Gage size
(inch)
3/22" to 3/8"
7/16" to 5/8"
3/4" to 7/8"
1" to 1 1/4"
Adjustment Procedure
in reverse feed solenoid mounting base
until it stops, and move the
of the plunger
, and tighten the setscrew
and
by hand.
and tighten the screw
.
Part No. Dimension
A
(mm)
10209203 16
10209500 24
10209807 30
10209906 37
.
and the side
– 49 –
Results of Improper Adjustment
o If the wiper
wiper will interface with the
needle clamp while the sewing
machine is no operation.
o If the wiper
positioned the wiper will interfere
with the needle clamp while the
sewing machine is in operation.
o If the wiper
positioned the wiper
in contact with the needle while
the wiper is in operation. (The
needle may breaks.
Results of Improper Adjustment
If the clearance provided between
the plunger radial plate and the
reverse stitching solenoid is larger
than the specified value:
o The attraction of the magnet will
. be decreased. In this case, the
machine fails to start reverse
feed stitching.
If there is no clearance provided
between the plunger radial plate
and the reverse stitching magnet:
o The stitch length for reverse feed
stitching ill be decreased.
is too long the
is not correctly
is not correctly
will come