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46
CARD
SORTING
MACHINE,
TYPE
75
Figure 34. Type 7S Counting Relay Cabinet
machine has insulated the card brush from the con-
tact roll. The AU and the BL points serve to keep the
contact roll from being hot in the event the machine
is stopped with cards in the feed and the contact roll
cover
is
raised.
Counter Magnets and Relays
In order to count into the digit counters, the card
count switch must be on. Counting in the digit counters
is initiated at the time the hole in the card is sensed
by the card brush. The circuit to impulse a counter mag-
net and its relay is as follows: from the plus
DC
ter-
minal, through contact roll cover switch 1, card lever
contact 1, commutator 2, (commutator 1 for a 9), CL
hold AL point, common brush, contact roll, hole in the
card, card brush, card count switch
ON)
CL hold BL
point, counting distributor common, spot on distri-
butor, counter magnet and counter relay in parallel,
commutator inner and outer brushes, commutator,
common brush, reset interlock contact,
to
the minus
DC
terminal.
The counter relays are high speed slate base relays;
therefore, once energized, they quickly complete a hold
circuit directly from the plus side of the
DC
line to
their respective counter magnets for the duration of
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