IBM 80 - Card Matching Device

CARD MATCHING DEVICE
A TYPE 75, 80 or 82 Sorter may be equipped with a
card matching
device and may be used for regular sort-
ing as well as for card matching. When it is desired to
do card matching, it is necessary to turn the two card
matching switches at the front of the machine to the
ON position. When regular sorting is desired, these
switches must be
OFF.
The card matching device is primarily used to sense
a previously filed pack of master and detail cards and
to reject those master cards which are not preceded by
one or more detail cards. In the following discussion
of card matching, detail cards will
be considered as
those cards whose file may be incomplete in quantity,
while master cards will
be considered as those cards
which constitute a complete
file.
Each detail card or group of detail cards precede
their master card or cards
in the sorter. These cards
are sensed
by a special demountable rail brush which
can
be mounted on the front or rear rail of the machine
(Figure
40). This brush should be timed in the same
manner
as the card brush. The rail brush is used to
sense corner cuts or a 12 or 9 punch in columns 1 or
80 of the detail cards.
Detail
cards may be fed into the machine 12 or 9
edge
first, face up or face down, depending upon
whether the detail cards are
filed in their storage cabi-
net in front of or behind the master cards. The method
of feeding
used should be that method which will allow
the detail
cards to be fed ahead of the master cards
Figure 40. Card Matching Rail Brush
55
and which will place the hole or corner cut at the lead-
ing edge of the detail card.
The 9 contact bar and the
zone contact bar on the
selector commutator must
be in the out (contacting)
position. All other contact bars should
be retracted to-
wards the center. The master cards are identified by
means of a significant punch in a specified column or
a corner cut on the opposite end of the card from which
the corner
cuts occur in detail cards. Significant punch-
ing in a master card is sensed by the regular card
brush. This punching, however, must not occur in
either of the two columns next to the rail brush. A
special
offset brush holder for the card brush is pro-
vided if it is desired to use a contrasting corner cut to
identify master cards.
If the identifying punch in the master card is other
than a 9 punch or a 12 punch, the corresponding
com-
mutator contact bar must be in the out position in
addition
to the 9 and zone contact bars. All other con-
tact bars should be retracted.
If master cards are being fed 12 edge first, the proper
commutator contact bar for sensing significant
punch-
ing must be selected in reverse order, i. e., an eight
contact bar for
11 punching, a seven contact bar for
o punching, etc.
Operation
Although it is possible to match detail cards with
groups of master cards, the operation described below
deals with only one master card for each group of
detail
cards.
The first detail card with a punched hole or corner
cut which
is read by the rail brush is sorted into the 9
pocket.
This sets up an automatic holding circuit to
sort
successive detail cards into the 9 pocket also. Those
derail
cards following rhe first derail card mayor may
not
have the detail identification punching or corner
cur in them. As soon as a master card is sensed by the
card brush, it
is automatically sorted into the 9 pocket
and the holding circuit
to sort 9's is interrupted before
the next card
is sensed. This master card is identified
by means of a significant punch or a corner cut which
contrasts
those on the detail cards.
Once the holding circuit for sorting 9's has been
interrupted
by sensing a master card, any succeeding
master
cards are passed into the reject pocket until