JUKI MEB-3200 Engineer's Manual page 15

Adjustment Procedures
1. Remove the throat plate. Instead of the throat plate, attach
timing gauge support base 1 supplied with the machine on
the machine.
2. Place timing gauge 2 supplied with the machine on timing
gauge support base 1, loosen setscrew 3, and move the
needle bar up or down to adjust so that the needle bar aligns
with the indented part of the timing gauge when the needle bar
is in the inside needle lower dead position.
(Caution) There are two kinds of timing gauges 2. (Select
the gauge according to the type.)
Adjustment Procedures
1. Bring the needle bar to the inside needle lower dead position,
loosen lower shaft sprocket setscrews 6 and move looper
driving cam 3 so that the plane of looper driving cam 3 faces
to the front. Then temporarily tighten the screws.
2. Loosen looper driving shaft guide setscrew 5 and move up
and down looper driving shaft guide 4 to adjust so that the
space between the needle and the left/right loopers becomes
the same when the needle bar is brought to the inside needle
lower dead position or the outside needle lower dead position.
3. Place timing gauge 3 on timing gauge support base 2 and
adjust using looper driving cam 3 so that the left looper blade
point is aligned with the center of needle when the needle bar
ascends 3.3 mm from the inside needle lower dead position,
and fix lower shaft sprocket setscrews 6.
4. Make sure of the position of needle and looper blade point
when the needle bar ascends 3.3 mm from the outside needle
lower dead position. The blade point is approximately in the
range of the left side of needle. In case of outside of the range,
adjust again steps 2. and 3..
(Caution) Be sure to perform the confirmation and re-
adjustment when the stitch bite width is changed.
Results of Improper Adjustment
™ When the needle bar is higher
or lower than the specified
position, stitch skipping occurs
in both cases.
Results of Improper Adjustment
™ The right looper advances when
™ The right looper delays when the
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the looper driving shaft guide is
lifted in the upper direction.
looper driving shaft guide is
lowered in the lower direction.