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NOTE: The following instructions apply goneraily'to Class
620, 625, 626 and 628 Machines. As indicated on page 13,
however. Class 628 Machines must use the Sight-Amplitude
Selector in lieu of a Release Mechanism in order to neu¬
tralize
the
particular zig-zag stitch pattern
provided by
the
replaceable
Fashion
Disc utilized.
Accordingly, the
section on page 20 dealing with Bight-Amplitude Adjust¬
ments
will be
particularly applicable to users
of Class
628 Machines.
Removal and Replacement
Remove
arm top cover, face plate, and control
panel.
Set stitch-pattern selectors at "A" — "K".
Remove driving-arm spring.
Remove bight-lever screw from bracket, and re¬
move bight lever.
Loosen
bight-amplitude
set-screw
and
remove
entire cam stack assembly.
Remove
bight-amplitude
and
pattern
selector.
Replace pattern selector in the reverse order of
its removal.
Observe the following:
Assemble cam stack as a complete unit. Upper
eccentric half of worm wheel shaft should be turned
toward hand-wheel-end of machine, as shown.
Make
certain
that
driving-arm
ball-pivot
is en¬
gaged with pattern selector.
Set
mesh between worm of arm shaft and worm
wheel of pattern-selector by turning bight-amplitude
shaft clockwise so that there is no binding and a
minimum amount of backlash.
Tighten bight-amplitude set screw.
Replace driving-arm spring
Replace bight lever and fasten with set screw.
Adjust machine as instructed below and on fol¬
lowing page.
18
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