68
SPECIAL
DEVICES
brush
is
wired, the card will sort into the 12 pocket.
2.
If
all the multiple column brushes read blank
columns in the card, the card will sort into the 12
pocket.
If,
however, one or more brushes
sense
selected
information, and one or more brushes
sense
blank
columns, the blank columns will not be analyzed
as
unselected information and the card will
pass
into the
reject pocket.
3.
If
only selected holes are sensed
by
the multiple
column brushes, the card will
pass
to
the reject pocket.
4.
If
one or more brush hubs are plugged to the
sorting common, the impulse from the brush hubs will
be
applied directly to the starter anode through the
regular sorting commutator.
In
order to sort to the
value sensed
by
the brush, both the zero-eliminate and
multiple column selection switches must
be
off.
5.
If
a brush selection switch
is
set to SORT, and
that brush senses a hole in the card, the impulse will
be
applied directly
to
the OA4G starter anode. This
im-
pulse will pass through those switches directly below
the switch set to
SORT and through the regular sorting
commutator.
In
order
to
sort
to
the value sensed by the
brush, both the zero-eliminate and multiple column
selection switches must
be
off.
ZERO
ELIMINATION
Static Circuit Conditions
A 2D21 thyratron tube (zero-eliminate control)
is
connected
across
the DC machine circuit with a 2000
ohm resistor and the R-ZE relay in series with its anode.
Negative grid bias for this tube
is
obtained in the same
manner
as
for the
MCS
control tube. The control grid
of the zero-eliminate tube
is
connected
to
the number
13
common brush on the
MCS
selecting commutator
through two
500K resistors.
Operation
of
the Zero-Eliminate Control Tube
When
any brush in the multiple column brush unit,
with the exception of the units column brush, senses
significant digit punching (1 through
9)
in the card,
a positive pulse
is
available at the lower punching hub
for that position.
When
wired for zero-elimination, this
impulse
is
directed into the
zero
selector hub and to the
common of the selecting commutator. The zero brush
contacts the A segment at
zero
time only. From the
common of the selecting commutator, the pulse
is
ap-
plied
to
the grid of the zero eliminate 2D21 tube
through common brush
13
and the two 500K resistors.
This pulse cancels the negative
bias
on the grid of the
2D21, causing it to
fire
and pick up the R-ZE relay.
The tube remains in conduction and the relay remains
energized until
the
end of the card
cycle
when
com-
mutator 2 breaks. The
N/O
R-ZE relay points shunt
commutator 1 to allow this condition.
At
6
3
4"
after 12 time, commutator 3 makes and
ap-
plies the plus DC machine voltage
to
the starting anode
of the
OA4G through the following circuit: from the
positive
DC terminal 13, through the CCR-B point,
con-
tact roll cover switch
1,
card lever contacts, commutator
2,
pin 3 on octal plug
B,
the R-ZE point, the 2000 ohm
resistor,
to
pin 6 on the
MCS
control tube, through the
47K resistor, pin 6 on octal plug
B,
commutator
3,
zero-eliminate switch 1-R
ON,
multiple column
selec-
tion switch 1-R
OFF,
to
the outer brush of the regular
sorting commutator, through pin 5 on octal plug
A,
the 47K resistor,
to
the starting anode of the OA4G.
Application of this voltage
fires
the OA4G and
causes
sorting of the card into the
12
pocket.
Zero-eliminate switch
2-L
prevents the
MCS
con-
trol tube from firing even though
some
brushes
may
have sensed a 0 punch in the card.
If
none of the brushes to the left of the units
posi-
tion sense a significant digit in the card, the zero elimi-
nate control tube
is
not
fired
and R-ZE
is
not picked
up.
When commutator 1 breaks at 3
3
2 before
0,
the
voltage
is
removed from the contact roll and the anode
circuits of both 2D21 tubes. This prevents any brush
from reading a
0,
11
or
12
hole in the card.
It
also
prevents the
OA4G tube from firing when commuta-
tor 3 makes.
If,
under the above conditions, the units
position brush senses a blank column or a
0,
lIar
12,
punch, the card will
pass
to
the reject pocket.
If
the units position brush
senses
a 1 through 9
punch in the card, this impulse
is
applied directly
to
the starting anode of the OA4G. The
ClCcuit
is
through
the brush selection switches to the left of the units
posi-
tion and the regular sorting selector commutator. Ap-
plication of this impulse to the starting anode of the
OA4G causes it
to
fire
and sort the card into the pocket
corresponding
to
the value of the punching sensed.
Significant digit values, which are sensed by the units
position brush
as
described above, are sorted to their
corresponding pocket regardless of whether
or
not the
zero eliminate tube has been fired.
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