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If this is not the case, release clamping screw
70
of rocker arm
7
1 (on which the zig-zag
link is suspended) and set needle to correct position. Tighten clamping screw.
IMPORTANT: Ensure that there is no clearance between take-up lever link and swivel
support when the eccentric is turned.
Now the limiting screw is set for maximum zig-zag width (approx.
4,5
mm).
The screw 69 is moved down until the distance from the edge of the stitch hole for right
and left needle penetration is approx.
0 , l
mm.
LATERAL M O T I O N OF NEEDLE DURING ZIG-ZAG SEWING
The sideways movement of the needle (parabola) must
be exactly matched to the up and down motion.
It must only begin when the tip of the needle during the
upwards motion is
7,5
mm above the needle plate and
must finish when the needle is
7,5
mm above the needle
plate during the downwards movement.
The motion is derived from the zig-zag eccentric
72
running at half-speed (1 :2).
Check:
Set LCR knob to center.
Set needle to uppermost position by turning handwheel. When the stitch width knob is
turned backwards and forwards between
( ( 0 ) )
and
( ( 4 ) ) ,
the needlemustremainstationary.
Otherwise, a correction must be made:
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