14
CARD
SORTING
MACHINE,
TYPE
82
The card brush· may be positioned at
any
column
desired through manual operation of the card brush
lifting handle and the finger lever on the index head
rack holder (Figure
4).
During a sorting operation,
it
is
necessary that the card brush lifting handle be
in a position with
its
handle downward,
as
this allows
the card brush to rest on the contact roll for the pur-
pose of reading the card.
When
the card brush lifting handle
is
rotated one-
half turn from its normal downward position, the
card brush assembly
is
raised clear of the contact roll
by
means of a cam pinned on each end of the worm
screw ( Figure
9).
These
cams
operate against rollers
to raise the worm
screw.
The worm
screw
is
normally
held down
by
means of a compression spring on each
end.
Rotation of the card brush lifting handle one-half
turn not only raises the brush to clear the contact
roll, but also disengages the index head stop locator
from the index bar rack. This
is
necessary if the brush
assembly
is
to be moved. For one column movement,
one complete revolution of the lifting handle
raises
the
brush, disengages the index head stop locator, moves the
brush one column through the lead of the worm, and
lowers the brush to the contact roll
as
the index head
stop locator seats in the adjacent index bar rack tooth.
Rotation of the card brush lifting handle in a clock-
wise
direction moves the brush toward the rear of
the machine. Rotation of the handle counterclockwise
moves the brush toward the front of the machine.
To move the card brush assembly a distance of
several columns or more, the lifting handle
is
rotated
one-half turn to
its
raised position.
As
stated above,
this raises the brush from the contact roll and disen-
gages the index head stop locator from the rack.
By
depressing the finger lever on the index head rack
holder, the index head locating nut
is
then disengaged
from the worm
screw.
This
is
a half nut and
is
nor-
mally held engaged with the worm screw
by
means of
a spring. Disengaging the index head locating nut
from the worm screw allows free movement, in either
direction, of the complete index head and brush holder
assemblies
as
a unit. Releasing the finger lever after
the desired movement has been completed again
en-
gages the locating nut with the worm
screw,
and
returning the lifting handle to
its
downward position
readies the brush for sensing the card.
Brush
Block
l!Iongated
Holes
Here
Brush
_----1-
Brush
Holder
F;~ure
10. Card
Brush
Holder
Assembly
A spring operated contact plunger (Figure 10)
provides the means of electrical connection between
the brush holder and an insulated contact rail. The
contact rail extends from front to rear over the entire
range of the card brush (Figure
9)
furnishing a con-
nection
to
the card brush regardless of the column
being sorted. A square end brush (part number 202)
is
used
and
is
held secure in the brush holder
by
means
of a locking screw (Figure
10).
Figure 9 indicates the procedure for removing the
card brush assembly. First, the lifting handle
is
turned
one-half revolution to
its
upper position. The locking
lever on the brush
is
then raised until it points
directly towards the left end of the machine. This un-
locks the brush assembly, allowing it
to
be removed
by
pulling it out to the left.
Commutator
The commutator assembly
is
mounted on the front
end of the first lower feed roll shaft. The function of
this assembly
is
to act
as
an electrical cam contact in
the card brush circuit and, in conjunction with the
card brush, to establish the timing of the impulses
which energize the sort magnet.
The commutator makes one complete revolution
for each card cycle; a card cycle being the distance
from the leading edge of one card to the leading edge
of the following card.
As
cards are
fed
from the maga-
zine they are separated
by
a distance of
%"
(Figure
11
).
The width of a tabulating card
is
3
~";
there-
fore, the distance from the leading edge of one card
to the leading edge of the following card
is
4".
The
distance between punching positions on a card
is
~",
center to center of the holes.
As
this distance of
~"
is
considered one point in the card cycle, the entire
card cycle then becomes a 16 point cycle
(4-7-
~
= 16) .
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