CIRCUIT
DESCRIPTION
49
1 has broken.
It
also provides hold circuits for the card
lever hold relay and the transfer setup relay and, in
conjunction with commutator 3 and the transfer setup
relay point, provides a pickup circuit for the count con-
trol relay.
Commutator 3
This commutator times the impulse to pick the
count control relay immediately after the 12 punch-
ing position of the card
has
passed under the card
brush. This impulse
is
delayed until after
12
time to
allow for the
pick of the transfer setup relay from a 12
hole in the card.
Pickup of the transfer setup relay
sets
up the circuit to the count control relay, which
is
timed
through commutator
3.
Commutator 4
This commutator, in conjunction with the card
brush and commutators 1 and 2, sets up a circuit to
pick the transfer setup relay when a hole
is
sensed in
the card and the card count switch
is
on.
Commutator 5
This commutator, in conjunction with card lever
contact
2,
times
the impulse to the total counters and
the reject counter. The make
time of this commutator
is
late
in
the card cycle after the card brush has had the
opportunity to
rea<l
all 12 positions of the card.
Counter Commutators 12 through 9
In
conjunction with the card brush and the
distri-
butor, these twelve commutators time the impulses to
the counter magnets. There
is
one commutator for
each counter position. Each of these commutators has
a duration time of 8 cycle points and,
,together with
the counter relay for that position, serves to furnish
an 8 cycle point hold circuit for
its
counter magnet once
the counter magnet has been impulsed.
Impulse Distributor
The distributor causes energization of the proper
counter magnets
by
successively conditioning each of
the counter relays to respond to the proper hole in
the card only.
Card Lever Contact
This contact
closes
as
the leading edge of the card
enters the first feed rolls.
Once closed, this contact remains closed
as
long
as
cards are feeding continuously through the machine
and, with commutators 1 and
2,
furnishes circuits for
sorting and counting all cards.
Card Lever Contact 2
This contact
closes
as
the leading edge of the card
leaves the second feed roll.
Once closed, it remains
closed
as
long
as
cards are feeding continuously
through the machine and furnishes a circuit to
pick
and hold card lever relay
2.
Card lever relay 2, in turn,
completes hold circuits to the card control relay and
the motor relay for automatic operation of the machine.
Card lever contact 2 also sets up the circuit to com-
utator 5 for impulsing the reject counter and the total
counters and for furnishing a hold circuit to the count
control relay.
Pocket Stop Contact
This contact
is
normally closed. Opening of this con-
tact when one or more card pockets become full renders
the runout circuit inoperative and causes immediate
dropout of the card control relay and the motor
re-
lay. Dropout of these relays stops the machine
as
soon
as
its inertia
is
overcome by friction.
Contact
Roll
Cover Switches 1 and 2
These two switches are held in a closed position
when the contact roll cover
is
lowered. Raising of the
contact roll cover opens both switches, breaking all
circuits
to
the contact roll and making the start cir-
cuits inoperative. These switches are installed
as
a
safety measure for operating personnel, and their oper-
ation must not be crippled in any
way.
Reset
Interlock Contact
This
N/C
contact
is
automatically opened during
manual resetting of the counters.
Opening of this con-
tact breaks all machine circuits
so
that accidental
starting of the machine
is
not possible.
Selenium Rectifier
The selenium rectifier in the circuit to the inner com-
mutator brush prevents back circuits to the counter mag-
nets after the brush control relay
ha~
been energized.
These back circuits would add a false count in the
corresponding counter when the inner brush made on
each segment of the selector commutator. This recti-
fier
replaces the sort control relay on older machines.
5.0
Mfd.
Condenser
The action of the 5.0 mfd. capacitor in
series
with
the sort magnet gives a large initial impulse to the
sort magnet when the card brush makes contact through
a hole in the card. This causes fast attraction
of
the
armature, after which the current tapers
off to hold
the sort magnet energized until the center brush on the
commutator breaks.
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