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9
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Adjustment Procedures
Results of Improper Adjustment
Adjustment Procedures
Results of Improper Adjustment
[Feed “0” adjustment]
1) Set the stitch length dial at “0”.
2) Loosen screw
1
, and align the timing mark on the feed crank stud
with that on the feed crank stud support.
(The position of the timing mark differs with models.)
3) When loosening screw
1
, confirm that there is no axial play at the
feed converting arm A (asm.) and tighten screw
1
.
[Normal feed adjustment]
4) Set the stitch length dial at the maximum value of the gauge to be
used.
* Normal feed is regulated to 2 mm at the time of delivery.
5) Loosen screw
2
, make the feed adjusting link come in contact with
the screw and tighten screw
2
.
[Reverse feed adjustment]
6) Loosen screw
3
, pushing the feed lever down to make the sewing
machine enter the reverse feed stitching mode, press reverse feed
amount regulation metal fitting against the projecting section of the
reverse feed adjusting link B. Now, tighten screw
3
. (Set the
condensation stitch length adjusting dial to the maximum value on
the scale.)
* Reverse feed is regulated to 2 mm at the time of delivery.
7) To decrease the reverse feed stitching length for fastening stitching,
use the condensation stitching function. (Refer to “Adjusting the
condensation stitching mechanism” in the Instruction Manual for the
LZ-2290 Series.)
™
The engraved dot is for reference only and fine adjustment is
necessary. When the ratio of sewing length (as many as 10 stitches)
of normal and reverse feed is approximately 90% in case of straight
stitch feed amount of 2 mm, the adjustment is OK.
In case of thread trimming
™
If the timing marks are not aligned
with each other, the actual feed
amount will be different from the
feed amount specified on the stitch
length dial. If the timing marks
greatly separate from each other,
the normal or reverse feed amount
will be increased causing the feed
dog to come in contact with the
thread trimming counter knife.
™
The feed dog will come in contact
with the throat plate.
1) Set the stitch length dial at the maximum.
2) Turn the handwheel, and fix the feed dog so that the clearances in
front and rear are the same at the position where the feed dog does
not come in contact with the throat plate.
™
In the case where the gear box (large) cover is not opened, loosen
screw
1
to adjust the position.
™
In the case where the gear box (large) cover is opened, loosen screw
2
to adjust the position.
Max. normal feed amount
of the mechanism
LZ-2290SS, DS=5 mm
LZ-2290SU, DU=2.5 mm
Max. reverse feed amount
of the mechanism
LZ-2290SS, DS=4 mm
LZ-2290SU, DU=2.5 mm
Normal feed
→
large
Reverse feed
→
small
Nomal feed
→
small
Reverse feed
→
large
