13
A) NEEDLE BAR STOPPING AND OPERATING MECHANISM
The
two needle bars individually and jointly, with the components as
sembled to their
insides,
cooperate with the needle bar connecting stud (Fig.
22) to accomplish the stopping and the operation.
The
positioning
of the
needle
bar at their
upper
ends
relative
to the
needle
bar
connecting
stud is
done
by
means
of
split
stop
rings
(2)
which
are
inserted
into
grooves
(1)
near the top ends of the
needle
bars, as
well
as
with
the
set screws of
the
needle
bar
position guides.
At their opposite ends the needle bars are locked to the needle bar con
necting
stud by
means
of three
special
high-strength
steel
balls
expanded
by
a
mechanism
inside
the
needle
bars
beyond
the diameters of the bars. Con
sequently, when
positioned
as
described
above
and as pictured on Fig.
22,
the
needle
bars move up and down with the
needle
bar connecting stud and are,
what
may
best be described as
"operational".
Needle
0.
Needle
bar
connecting
stud
Needle
bar
Fig.
22
Fig.
23A
Fig.
23B
Operating mode Non-operating mode
From the library of: Superior Sewing Machine & Supply LLC
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