IBM 80 User Manual

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

IBM 80 Specifications

General

Brand	IBM
Model	80
Category	Office Equipment
Language	English