JUKI Union Special 36200 CLASS Series, Adjusting Instructions And Illustrated Parts List

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SETTING THE NEEDLE BAR HEIGHT & ALIGNMENT (CONT)
Correct spacing of the needles in the throat plate stitch tongue is
imperative to proper sewing conditions. Improper relationship of the
needles to the stitch tongue often results in malformed stitches.
When replacing the stitch tongue make sure needles are aligned
properly (see Fig. 4).
If the stitch tongue and throat plate are properly seated and the
needle position is not correct, the cylinder has probably been forced
out of position. If realignment is necessary, refer to the section
"Aligning the Cylinder".
When the needles are correctly positioned in the throat plate the
space to the left of the needles in the stitch tongue slot is .006"
(0.15mm) more than the space to the right (see Fig. 4). Actually, the
needle bar is centered to the throat plate and cylinder, however, to
provide clearance on the left side of the needle for the needle loops
passing around the looper during the down stroke of the needles, the
slots in the stitch tongue are made off-center to the left. Accurate
positioning of the needles may be obtained by repositioning the
cylinder.
ALIGNING THE CYLINDER
Remove the top front cover and gasket from the main frame. Loosen
cylinder holding screw (A, Fig. 5). Turn eccentric screw (B) clock-
wise to move the cylinder so the needles are closer to the right side
of the stitch tongue. Turn the stud counterclockwise to locate the
needles closer to the left. Tighten screw (A) and recheck settings.
NOTE: The cylinder may not move freely when the eccentric is turned
because the joint sealant compound has set. Light tapping with a
wooden block at the joint or midpoint of the arm may be necessary.
SETTING THE LOOPER TRAVEL
USING GAUGE 21227CN
Attach looper travel gauge plate (A, Fig. 6) to the rear of the cylinder
arm. Set the bottom of the gauge so it is approximately horizontal
and lock lightly in place with screw (B) directly underneath. Attach
looper travel gauge pointer (C) to the looper using the left needle
guard screw hole. Turn the handwheel in operating direction until the
looper is positioned to the far right. Set pointer (C) at zero degrees
by rotating gauge plate (A) and lock in place. Continue turning the
handwheel until the pointer stops. If the looper travel is correct the
pointer should indicate 55°40'.
FIG. 4
FIG. 5
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FIG. 6