GROUP
SORTING
DEVICE
IBM 80 and 82 Sorters may be equipped with the
group sorting device. This device permits sorting of en-
tire groups of variously punched detail cards, according
to the punching in a single master card which precedes
each group. Operation of the device
is
externally con-
trolled
by
two group selection switches. On a Type 82
machine, these switches are mounted below the
start
and stop buttons in a special
recess
in the right upper
front cover assembly.
On a Type 80 machine, these
switches are mounted on the front of the cover over
the card
feed
crankshaft mechanism.
When
the group selection switches are on, the group
sorting device
is
operative; when they are
off,
group
sorting
is
rendered inoperative and regular sorting can
be
accomplished in the normal manner. On a Type 82
machine, when the group selection switches are first
turned on, the machine
is
electrically interlocked under
control of a time delay relay and can not be started
for approximately one minute, until the group sort
tube filaments reach their proper operating tempera-
ture.
The
use
of the group sorting device
does
not affect
machine speed. This device can
be
furnished for opera-
tion in either one of two
ways:
Single Master Card Method: The single master card
method requires only that each group of detail cards
be
preceded
by
a master card. This master card
de-
termines the pocket into which its detail cards will
sort, even though the detail cards may
be
punched
differently in the column being sorted. Master cards are
identified on their leading edge
by
a corner cut. This
corner cut
is
sensed
by
a special rail brush at a separate
sensing station located ahead of the contact roll on
either the front or rear side rail of the machine. Figure
51
shows the location of this brush on a Type 82
machine.
On a Type 80 machine, this brush
is
located
on the front or rear card magazine
side
plate. On either
type of machine, the master card corner cut may
occur at the column 1 end or the column
80 end of the
card, depending upon whether the special rail brush
is
mounted on the front or rear rail of the machine.
Machines may
be
equipped with both a front and a rear
rail brush. A front-rear switch controls the selection of
these brushes and must
be
set
to correspond with the
70
position of the corner cut
in
the master cards. The
de-
tail cards need have no identification. They may have
corner cuts in them but these corner cuts must not be in
same postion
as
the corner cuts on the master cards.
Trailer Card
Use:
The double master card method
requires both a leader card and a trailer card for each
group. The master (leader) card controls the sorting
as
in the single master card method, but a trailer card
is
used
to
signify the end of each group. The master
card
is
identified
by
a corner cut on its leading edge;
the trailer card
is
identified
by
a corner cut on its trail-
ing edge; the detail cards require no identification.
Detail cards, however, must have no corner cuts which
would identify them
as
master or trailer cards. Two
rail brushes, one on the front rail and one on the rear
rail, are required on a Type 82 machine when the
double master card method
is
used. One rail brush
is
used to sense master cards while the other rail brush
is
used to sense trailer cards. On a Type 82 machine,
once the rail brushes are installed, the
use
of these rail
brushes
is
not flexible; that
is,
all master cards for all
group sorting applications on a particular machine must
have their corner cuts in the same position. All trailer
cards must have their corner cuts on the opposite edge
of the card.
Figure
51.
Group
Sort
Rail
Brush
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