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16
CARD
SORTING
MACHINE,
TYPE
82
the main (outer) common ring. Note that if the zone
contact bar is in its retracted position, the digit com-
mon is not connected
to
the main common. By re-
tracting the zone contact bar, sorting of all digit values
1 through 9 is suspended and only 0, 11, and 12 values
are sorted.
There are three division points on the periphery of
the commutator; the inner, center, and outer rings.
Three contact brushes ride on this periphery, one to
contact each ring (Figure 11). The inner ring con-
sists of 12 insulated segments corresponding to each
value in the card and internally connected to the 12
contact spots as mentioned above. The commutator
is timed to the machine in such a manner that, when
the card brush makes through the 4 hole in the card
for example, the inner commutator brush will be mak-
ing contact on the 4 segment. The center and outer
rings are commoned together. The outer (common)
ring extends around the complete circumference of
the commutator. The center ring extends around
approximately three fourths of the commutator cir-
cumference; the other one fourth is insulation.
When a hole is sensed in the card, a circuit
to
fire
the OA4G trigger tube is first completed through the
commutator from one of the 12 segments on the inner
ring to the outer or common ring through the com-
mutator contact brushes and the contact bar for that
position. As soon as the trigger tube has been fired, a
holding circuit
to
maintain conduction in the tube is
completed from the center brush
to
the outer brush.
Firing the trigger tube removes the negative bias on
the sort magnet control tubes and allows them to
energize the SOrt magnet. Furnishing a hold circuit to
maintain conduction in the trigger tube keeps the sort
magnet energized until the center brush breaks con-
tact on the center ring. This occurs after the 12
position on the card has passed under the card
brush, thus completing the sensing of any holes in
that card column.
If
two holes are present in a column being sensed,
and no provisions are made by means of the contact
bars on the commutator to suspend sorting of one
value, the card will sort according to the first value
sensed by the brush.
When the reading brush is resting on the bare con-
tact roll between cards, no circuit is available to fire
the trigger tube because both the inner and center
commutator brushes are on insulated portions of the
commutator.
Drive Shaft and Motor
Mounted on the rear of the machine is a horizontal
drive shaft which transmits power from the motor to
drive the card feed mechanism, the feed rolls, and the
contaot roll. The drive motor
is
10C3Jted under the
base on the left end of the machine and is connected
Figure
13.
Main Drive Shaft and Pocket Stop Shaft
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