MECHANICAL
AND
ELECTRICAL
PRINCIPLES
15
Fillure 11. Card Spacing
However, the sort magnet can
be
energized only on
12 points of this cycle. These 12 cycle points
corres-
pond
to
the 12 punching positions on the card. The
remaining four cycle points represent the distance
from the
12
hole of one card
to
the 9 hole of the
following card.
Figure
12
shows a commutator disassembled. Note
the
13
contact spots near the center. Twelve of these
spots, each adjacent to the other, are internally
con-
nected
to
the twelve segments on the inner (lower)
ring. Nine of these spots, representing the digits 1
through 9, may be connected
to
the digit common on
the extreme outer (upper) surface of the commutator
by
means of the individual contact bars, the operation
of which
is
shown
in
Figure 12. 'The other three spots,
representing the
0,
11
and
12
values, may be con-
nected directly to the main common (outer) ring
by
means of their individual contact bars.
The thirteenth contact spot
is
internally connected
to
the digit common and,
by
means of its contact bar
(zone contact
bar),
maybe
externally connected to
Figure 12.
Commutator
Assembly
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