IBM 80 User Manual

A U X IL I A R Y CAR. D C 0 U NT I N G D E V ICE 51
Rotation of the Veeder shaft causes a 1 to be added
to the units position as mentioned previously. When
the card count magnets are de-energized, the rotor shaft
and drive linkage are returned
to their normal posi-
tions by means of the rotor return spring located on
one end of the rotor shaft (Figure
37).
CIRCUIT DESCRIPTION
FIGURE 38 is a reproduction of wiring diagram
260276B and shows the circuit required for the opera-
tion of the auxiliary card counting device. Wiring dia-
gram 260276C, which features the new cam-type
counter,
is not shown but is similar in operation to
260276B. The major differences between the Band
C suffixes is that on B suffix diagrams the card count
magnets are wired in series, while on C
suffix diagrams
they are wired in parallel.
Figure 36. Auxiliary Card Count and Sort Suppression
Commutators
When the card count switch is on and cards are pass-
ing through the machine, a circuit is completed near the
end of the card cycle
to impulse the card count magnets
as follows: from DC terminal 14, through contact roll
cover switch
2, Rl, counter magnets, card counting
commutator, card count switch, outer point of card
lever contact
1, contact roll cover switch 1, to DC ter-
minal 13.
The timing chart shows that the card count cam
makes
3V' after the center brush leaves· the metal
segment of the selector commutator, and breaks while
the next card
is passing under the card brush. When
the card count cam breaks, the card count mechanism is
restored to normal by means of the rotor return spring.
Since the card feed crankshaft makes one revolution
per card
cycle, a circuit is completed to the card counter
once for each card passing through the machine.
To insure the best operating characteristics
of the
rotor and the magnets, the proper value of
Rl should
be used. These values are shown in Figure 38 and on
wiring diagram
260276B. Resistor 1 and the condenser-
resistor coupling that shunts the card count commutator
are both located on the rear of the relay gate.
Figure 37. High Speed Card Counter Assembly

IBM 80 Specifications

General

Brand	IBM
Model	80
Category	Office Equipment
Language	English