JUKI MEB-3200 Engineer's Manual page 57

Adjustment Procedures
1. Long thread trimming type (S/R types)
1) Turn looper bracket 4 to the front.
2) Turn ON the needle thread trimming cylinder with the test mode
2. Looper thread haul driving arm 5 moves downward (in the
direction of arrow mark A) and presses down link B 6. Then
looper thread haul plate 1 moves in the direction of arrow
mark B.
3) Loosen setscrew 2, move link B 6 and adjust the position of
looper thread haul plate 1 (= haul amount of looper thread).
* When the looper haul is OFF, looper thread haul plate 1
comes in contact with stopper 7 by means of return spring
3.
(Caution) When using the needle thread clamp, in case the
clamped needle thread is hard to come out of the material
and the remaining amount of needle thread is apt to be
unstable, slightly increase the haul amount of looper thread
(stroke). Then the thread is apt to easily come out of the
material and the length of remaining thread may be
stabilized.
2. Short thread trimming type (J/C types)
1) Turn looper bracket 4 to the front.
2) Move needle thread trimming moving arm !0 to arrow mark D
side by hand until stopper screw !1 comes in contact with looper
bracket 4.
Needle thread trimming moving arm !0 presses looper thread
haul adjusting plate 8 and looper thread haul plate 1 in the
direction of arrow mark B.
3) Loosen setscrew 9, move looper thread haul adjusting plate
8 and adjust the position of looper thread haul plate 1 (=
looper thread haul amount).
Results of Improper Adjustment
™ Slightly increase the stroke when
the looper thread comes out of the
looper thread clamp by the moving
of the feed at the sewing start.
(In the direction of arrow mark B)
™ Slightly decrease the stroke when
the seams of several stitches at the
sewing start float (loose stitches).
(In the reverse direction from arrow
mark B)
™ Slightly increase the stroke when
stitch skipping occurs at the first
stitch at the sewing start.
(In the direction of arrow mark B)
™ Slightly decrease the stroke when
the seams of several stitches at the
sewing start float (loose stitches).
(In the reverse direction from arrow
mark B)
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