38
CARD
SORTING
MACHINE,
TYPE
80
this relay
is
a high speed slate base relay. Its primary
function
is
to prevent starting of the machine
by
any
means other than the start
key.
This relay
is
picked
when the start key
is
depressed and remains energized
as
long
as
the machine
is
running.
THE
CCR-A
point,
in conjunction with card lever
contact 2, completes a hold circuit
to
the card control
relay and the motor relay.
In
its
NjO
condition, it pre-
vents the energization of either of the above relays
ex-
cept
by
means of the start
key
in the event the machine
is
stopped with cards in the
feed.
THE
CCR-B point prevents a back circuit which
would make the contact roll hot if the machine
was
stopped with cards in the
feed
and the contact roll
cover
was
raised.
Brush Relay
This relay
is
a high speed slate base relay. Its pur-
pose
is
to provide a holding circuit for the sort magnet
from the time an impulse
is
sensed through a hole in
the card until the end of the card cycle when the
cir-
cuit
is
broken
by
means of the commutator center ring
and brush.
Card
Lever
Contact
1
This contact closes
as
the leading edge of the card
enters the first feed rolls. Closing of this contact allows
sorting of the first card. Once closed, it remains closed
during the time that cards are feeding continuously
through the machine and,
in
conjunction with card
lever contact
2,
furnishes circuits
to
the commutator
for sorting.
Card
Lever
Contact
2
This contact
closes
as
the leading edge of the card
leaves the second feed roll. Once closed, it remains
closed during the time that cards are feeding con-
tinuously through the machine, and furnishes circuits
to the commutator for sorting and to the card control
relay and the motor relay for automatic operation.
This contact maintains the circuit to the commutator
and contact roll for sorting the last card.
Pocket Stop
Contact
This contact
is
normally closed. Opening of this
contact, when one or more card pockets become full,
renders the runout circuit inoperative and causes im-
mediate dropout of the card control relay and the motor
relay. 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
machine circuits and
remO\liing
the potential from the
contact roll. These switches are installed
as
a safety
measure for operating personnel, and their operation
must not be crippled in any
way.
5.0
Mfd
Condenser
The action of the 5 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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