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MECHANICAL AND
ELECTRICAL PRINCIPLES
THE REAR cover assembly and the covers on the right
and left ends of the machine are each held in place
by means of concealed latches. These latches may be
released by pressing on the latch cover plate.
The cover over the switch plate is hinged at the
bottom and held in place by a holding screw at the
upper right hand corner. The right end cover must
be removed before this holding screw is accessible.
Four adjustable levelers are furnished with each
machine for the purpose of leveling the machine and
to eliminate excessive vibration caused by an uneven
floor surface.
Chute Blades and Sort Magnet
In Figure 5, a card is shown passing between the
card brush and the contact roll just after it has been
fed from the bottom of the pack in the card maga-
zine. The leading edge of the card is passing under
the tips of the chute blades and the card brush is
wiping across the face of the card in search of punched
holes in the column being sorted.
The chute blades are formed strips of tempered
spring steel, varying in length, from the opening of
each pocket to a position resting on the top of the
Fi~ure
5.
Sensin~
the Card
11
sort magnet armature. There are two styles of chute
blades in use. The old style blade is .008" thick and
the new style blade is .009" thick. The .009" blade
has better wearing qualities than the .008" blade.
Each blade is numbered according to the pocket to
which it guides the card. In guiding a card to the
proper pocket, the card rides immediately over the
chute blade for that pocket.
Assume that a 4 is punched in the column on which
the card brush is set. The chute blades are so arranged
that when the card has advanced to the position where
the card brush makes contact with the contact roll
through the 4 hole, the leading edge of the card will
have passed under the 9, 8, 7, 6, and 5 chute blade
tips as shown in Figure 6. In passing under the chute
blades, the card separates them from the sort magnet
armature.
As soon as contact
to
the contact roll is made by
the card brush, circuits are completed which energize
the sort magnet. Energization of the sort magnet at-
tracts the sort magnet armature. This armature is
normally held in a raised position away from the
magnet cores (Figure 6) by means of a return spring.
As the armature is attracted, the 4, 3,2, 1, 0, 11, and
12 chute blades follow it down because of the spring
tension on the blades; but the 9, 8, 7, 6, and 5 chute
blades are held up by the card, thereby creating an
opening between the 5 and 4 blades (Figure 7). The
feed rolls convey the card through this opening (over
the 4 blade and under the 5) towards the 4 pocket.
As the card nears the 4 pocket, travelling between the
4 and 5 chute blades, it strikes a formed ear on the
under surface of the 5 blade which guides the card
into the 4 pocket. As the card travels into the pocket,
a deflector spring (Figure 8) is pushed upward by
the card; then as the card leaves the feed rolls, the
tension of this spring deflects the card downward. This
action causes proper stacking of the card as it is free
of any drive which might cause it to stand on edge.
An armature knockoff screw insures the return of
the sort magnet armature to its normal position before
the next card is read (Figure 7). The knockoff screw
is rotated counterclockwise (as shown by the arrow)
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