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Adjustment Procedures Results of Improper Adjustment
1) To adjust the height and inclination of the feed dog, loosen setscrews
1 in the vertical feed link shaft and turn vertical feed link shafts 2
and 3 with a screwdriver.
2) The standard inclination is the position where the engraved marker
dots of vertical feed link shafts 2 and 3 face in the direction of 9
o’clock (left side).
3) The standard height of the feed dog is 1.4 mm from the top surface of
the throat plate.
<Adjusting the slippage of materials>
◎ This machine can adjust “Amount of slippage of materials” by
adjusting the height and inclination of the feed dog.
4) Mainly adjust vertical feed link shaft 3.
The amount of slippage of materials can be adjusted by the position
of the engraved marker dot which means the size of each theta θ of
the inclination of the feed dog.
* Points of adjustment.
1. Quality of finished products is improved when the slippage of materials
is slightly adjusted to the minus state. (Operator’s hand pressure
should be considered in actual sewing.)
2. When performing the adjustment, simultaneously adjusting vertival
feed link shafts 2 and 3 makes it difficult to see the characteristic of
the slippage of the material. So, set 2 to the standard state (reference)
and mainly adjust 3.
3. In the case where the slippage of material (0 to minus) cannot be
obtained by adjusting vertical feed link shaft 3 only, adjust vertical
feed link shaft 2 so that theta θ , inclination of the feed dog is
increased.
<Adjusting the feed timing>
1) Adjust the engraved marker line on the thread take-up to timing mark
G on the face plate.
2) Set the feed amount to 2.5 mm. However, for LZ-2290SU and LZ-
2290DU, set it to "0" mm.
3) In this state, loosen the setscrew in the hook driving shaft sprocket,
and adjust timing mark on the horizontal feed cam to that of the
horizontal feed rod.
(Caution) In this case, the hook timing (thread trimming timing in
case of the machine with thread trimmer) changes. Be sure to
perform re-adjustment.
™ The height 1.4 mm of the feed dog
has been factory-set at the time of
delivery. Change the height in
accordance process the process.
(Characteristic of slippage of
materials changes. So, be careful.
™ When the adjustment of the height
of the feed dog has been performed,
the sewing pitch is different from the
scale on the stitch length dial. Re-
adjust the scale with the actual
sewing pitch.
™ Characteristic of slippage of
materials changes in accordance
with materials.
(The relation between the direction
of the engraved dot and slippage of
materials described in the
Engineer’s Manusl is the standard
of adjustment.)
™ Adjust on the left-hand side the
adjusting positions of the engraved
marker dots of vertical feed link
shafts 2 and 3.
If the position of the engraved
marker dot is on the right-hand side,
the effect of prevention of slippage
of material is difficult to be obtained.
Range of use
of engraved
marker dot
Left Right
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