– 13 –
Adjustment Procedure
Results of Improper Adjustment
1. Set the stitch dial to [0] on the scale.
2. Loosen the aperture plate set screw
.
3. Let the hand wheel graduation [A] coincide with the upper surface
of hand wheel indicator
.
4. Loosen the clamping screw
of the needle bar connecting rod.
5. Adjust the distance between presser bar
and upper feed bar
to 10.2
±
0.1mm and tighten setscrew
of the needle bar rocking
lever.
(At that time, the presser assumes the state of lowering. The
measuring position of 10.2
±
0.1mm is based on the height of the
bottom surface of presser bar lower metal
.
(Cautions) Fasten the set screw with a tightening torque of 7.84 to
8.82N•m (80 to 90 kgf•cm).
6. Adjust feed dog
so that the needle center coincides with the
center of the feed dog hole.
7. Raise the presser bar lifting lever.
8. Insert the hinge screw
of the presser bar lifting cylinder
into
the forked section of the presser lifting lever
.
9. Make sure that the bottom face of the knee lifter arm A
is en-
gaged with the presser lifting lever
.
10. Attach the aperture plate
in place.
(Caution)
The feed amount of the needle is mechanically larger
than the feed amount of the feed dog
by 5%.
o If the needle entry is adjusted too
close to the operator:
1) The needle
may interfere with
the feed dog
, resulting in
needle breakage.
o If the needle entry is adjusted too
far from the operator:
1) When the needle comes out of
the slot in the throat plate, the
needle
may interfere with the
feed dog
, resulting in thread
breakage.
2) The needle
may come in con-
tact with the feed dog
during
the reverse feed stitching, result-
ing in needle breakage.
2’ For how to remove the aperture
plate in LU-2220N-7, refer to [3.-
(18) Aperture Plate Removal
Procedure].
5’ At that time, move the needle bar
connecting rod
to the right or
left until the needle bar connect-
ing rod
is positioned approxi-
mately at the center of the play.
If the needle bar connecting rod
is not correctly positioned, an ex-
cessive torque may result.
10’For how to attach the aperture
plate, refer to [3.-(18) Aperture
Plate Removal Procedure].
