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MECHANICAL AND
ELECTRICAL PRINCIPLES
13
Figure
8. Cards
Entering the Pockets
and is mounted on the third lower feed roll shaft,
which is driven from the main worm shaft and makes
one revolution per card cycle. It is timed
to
knock
off the armature between the 12 position of one card
and the 9 position of the following card. Although
the return of the sort magnet armature is spring actu-
ated, the knockoff screw is provided to overcome any
residual magnetism present in the sort magnet.
If the card fed is unpunched in the column being
sorted, the card brush fails
to
make contact with the
contact roll; therefore, the sort magnet is not ener-
gized and its armature is not attracted. Consequently,
the card is fed under all the chute blades and deflected
into the R (reject) pocket.
Card Brush Assembly (Figure 9)
It will be noted by referring to Figures 6 and 7
that the card brush makes contact on the contact roll
through the hole in the card. This sets up circuits
which cause energization of the sort magnet.
Figure 9. Removing the Card Brush' Assembly
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