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'
M E C H . A N I C A L
P R I N C I P L E S
'
11
Terminal Punch Magnet
80
Terminal Punch Magnet
10
Selt
(Full
Common Terminal
Motor Starting
/
Capacitor
Connector Latch
miurn Rectifier
Figure 8. Read and Punch Unit-Right
Side View
supply chassis extends across the entire depth of
the lower left section of the punch unit. The rest
of the power supply chassis-can be seen in Figures
10
and
11.
The right side view (Figure
8 )
shows the punch
magnet terminal connections. I t will be observed
that these connections are the reverse of standard
gang punch connections. This is because the cards
are fed into rhis machine face down, 9 edge first.
connector used on summary punches. To permit
access to the rear of the cable connector, the frame
on which the cable connector and the selenium
rectifier are mounted can be swung down.if the
latch holding %he frame in place is 'released. The
selenium rectifier shown below the cable connector
is a full-wave rectifier which supplies 40 volts'
D.
C .
in conjunction with the main transformer for the
operation of the relays and punch magnets .in the
Relays are mounted on the right side only if the
punch unit. The filrer capacitors for this rectifier
class selectors and sign control features are in-
are mounted on the left side.
stalled. The cable connector which provides a con-
The left side view (Figure 9 ) shows the cam
venient means of electrically connecting the read
contact unit which is mounted under the card hop-
and punch unit ro the electronic unit is a standard
per. There is space for 52 cam contacts in this
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