JUKI LU-2810 Series, Engineer'S Manual

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Adjustment procedures Results of Improper adjustment
1) 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 of alternate vertical movement is not equal,
remove the rubber plug
3
on the rear face of machine arm.
Loosen clamping screw
4
of the top feed rear arm to adjust so
that the amount of alternate vertical movement can be unified.
Adjust the amount almost to A = B.
o
When the amount of alternate vertical movement of the walking
foot is larger than that of the presser foot :
1) Loosen clamping screw
4
of the top feed rear arm in the state
that walking foot
1
is raised a little, press walking foot
1
against the feed dog.
2) Re-tighten clamping screw
4
of the top feed rear arm and turn
the handwheel to make sure of the amount of alternate vertical
movement.
Adjust the amount of alternate verti-
cal movement of the walking foot
1
so that it is larger than that of the
presser foot
2
in accordance with
the sewing products.
o
Sewing sponge material or the
like
o
Sewing material with overlapped
sections
When the amount of alternate verti-
cal movement of the walking foot
1
and presser foot
2
are consider-
ably different :
o
The stitch pitch is different from
the value set by the dial.
o
Decrease the number of revolu-
tion of the motor a little since the
feed efficiency is decreased.
Adjustment procedures Results of Improper adjustment
1. Loosen hinge screw
1
of the horizontal feed rear arm.
2. Move hinge screw nut
3
of the horizontal feed rear arm to ad-
just so that the distance from machined surface of the horizon-
tal feed rear arm
2
to notched part of the hinge screw nut
3
of the horizontal feed rear arm is 10.9 ± 0.1 mm. Then tighten
hinge screw
1
of the horizontal feed rear arm.
3. Turn the handwheel to check the needle sway.
(Standard) 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.
o
Needle breakage or stitch skip-
ping will result.
海外講習会用121122 LU-2810(-7)̲EM