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CIRCUIT
DESCRIPTION
47
their counter commutator segment. The duration of
each counter commutator is 8 cycle points.
It can be seen by analyzing the above circuits that
each hole sensed by the card brush will be counted
when the card count switch is on.
Transfer Set Up Relay
When the card count switch is on, a circuit is com-
pleted each time the card brush makes contact through
a hole in the card to pick the transfer setup relay as
follows: from the plus
DC
terminal, through contact
roll cover switch 1, card lever 1, commutator 2, (com-
uta tor
1
for a 9), CL hold AL point, common brush,
contact roll, hole in card, card brush, card count switch
ON,
CL hold BL point, commutator
4,
transfer setup
relay pickup coil,
R-7,
reset interlock contact, to the
minus
DC
terminal.
Once it is picked, the transfer setup relay is held
energized through its own point and commutator 2.
When counting 9's, a parallel hold circuit is available
through commutator
1
and the card lever hold AL
point. This latter hold circuit is necessary when count-
ing 9's because commutator
2
does not make until
8
time.
Count Control Relay and Reject Counter
Pickup and hold of the transfer setup relay allows
a circuit through commutators
2
and
3
to energize
the count control relay. This transfers the count con-
trol relay A points, thus establishing a hold circuit to
the count control relay through commutator S and, at
the same time, preventing a circuit to the reject counter.
If
no hole is sensed by the card brush, neither the
transfer setup relay nor the count control relay will
be
energized. Therefore, when commutator S makes, a
circuit will be completed to the reject counter to count
one unit.
Total Counters
In conjunction with card lever contact 2, commutator
S furnishes the electrical impulse to the sub total and
grand total counters. Under their proper switch set-
tings, these two counters count the cards passing
through the machine. They do not count punched holes.
As long as card lever contact 2 is closed, signifying
that cards are passing through the reading station, the
total counters will count one each time commutator S
makes.
SORTING CIRCUITS
SORTING
of cards on the Type
7S
machine occurs only
when the sort switch
is
on.
If
the sort switch is off, all
cards passing through the machine are directed to· the
reject pocket. Even though all cards are passed to the
reject pocket when the sort switch is off, normal count-
ing of the cards and the digit values in the cards can
take place if the card count switch is on and the card
brush is lowered on the contact roll.
The circuit to energize the sort magnet and the brush
control relay when a hole is sensed in the card
is
as
follows: from the plus
DC
terminal, through contact
roll cover switch 1, card lever contact 1, commutator
2 (commutator 1 if sorting a 9) card lever hold AL
point, common brush, contact roll, hole in card, card
brush, selenium rectifier, inner to center sorting com-
mutator brushes, brush control relay, R-l, sort mag-
net, sort switch,
F7,
contact roll cover switch
2,
reset
interlock contact, to the minus
DC
terminal.
Once it is energized, the sort magnet is held energized
through the outer and center sorting commutator
brushes and the brush control relay contact point. This
circuit holds the sort magnet energized until the center
brush breaks contact on the commutator common
shortly after the 12 position on the card passes the
card brush. Between the 12 position of the leading card
and the 9 position of the following card, the armature
is restored to
its
normal raised position by means of
the armature return spring and the armature knock-
off.
PURPOSE OF RELAYS, COMMUTATORS,
AND CONTACTS
Motor Relay
The motor relay is a heavy duty relay. Its purpose
is
to
complete a circuit
to
the drive motor. It is picked
up on depression of the start key and is held energized
primarily under control of the card lever 2 relay B
point. When the machine runs out of cards, the run-
out capacitor discharges through the motor relay, hold-
ing it energized while the last card is fed to its proper
pocket. As long as the motor relay is energized, its
points complete a circuit to the drive motor.
Card Lever Relay 2
This relay is a duo relay. The purpose of this relay
and its B point is to furnish an isolated hold circuit
to the card control relay and the motor relay under
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