JUKI LU-1510N Engineer's Manual page 29

Adjustment Procedures
2) Alternate momentum
1. Set the stitch dial to "0".
2. Turn the handwheel to make sure that the amount of alternate
vertical movement of walking foot 1 and presser foot 2 is
almost equal.
3. When the amount is not equal, loosen setscrew 3 in the top
feed rear arm and adjust so that the amount should be equal.
Adjust the amount almost to A = B.
™ In case of the machine without thread trimmer
Loosen the window plate setscrew and remove the window
plate to adjust the amount.
™ In case of the machine with thread trimmer
Remove the rubber plug to adjust the amount.
™ When the amount of alternate vertical movement of the walking
foot is larger than that of the presser foot :
1) Loosen setscrew 3 in the top feed rear arm in the state that
walking foot 1 is raised a little, press walking foot 1 to the
feed dog.
2) Re-tighten setscrew 3 in the top feed rear arm and turn the
handwheel to make sure of the amount of alternate vertical
movement.
Adjustment Procedures
1. Loosen hinge screw nut 1 in the horizontal feed rear arm.
2. Move horizontal feed connecting rod 2 so that the distance
from the center of the horizontal feed shaft to that of the hinge
screw is 20 ± 0.5 mm and tighten the nut 1.
3. Turn the handwheel to check the needle sway.
(Standard) 1. The engraved marker line on horizontal feed
rear arm 3 aligns with the center of the hinge
screw.
2. When the distance is lengthened more than the
standard adjustment value, the bottom feed
amount is decreased.
(Caution) When you desire to change the bottom feed amount,
re-adjust the needle entry position since the needle entry
position changes.
Results of Improper Adjustment
Adjust the vertical stroke of the
walking foot so that it is larger than
that of the presser foot in accordance
with the sewing products.
™ Sewing sponge material or the
like
™ Sewing material with overlapped
sections
When the alternative vertical
strokes of the walking foot and
presser foot are considerably
different
™ The stitch pitch is different from
the value set by the dial.
™ Decrease the number of revolution
of the motor a little since the feed
efficiency is decreased.
Results of Improper Adjustment
™ Needle breakage or stitch
skipping will result.
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