42
CARD
SORTING
MACHINE,
TYPE
75
Each of the upper
five
commutators are individually
adjustable since each one
is
fastened
to
the shaft
by
means of set screws. Two brushes ride on each of the
17
commutator surfaces to make and break contact at
timed intervals.
The impulse distributor consists of two rotating
brushes which follow the inside surface of a circular
emitter strip. This circular strip has twelve contact
spots, one for each punching position
in
the card, and
a common ring. The common brush rides the common
ring while
a selecting brush makes and breaks con-
tact on each of the twelve contact spots in synchronism
with the timing of the card
as
it passes the card brush.
When the card brush
is
reading a 9 hole for example,
the selecting brush of the distributor
is
made on the 9
contact spot; when the card brush
is
reading a 5 hole,
the selecting brush
is
made on the 5 contact spot. As
the selecting brush makes on a contact spot, it electri-
cally connects that contact
spOt
to
the common ring.
The impulse distributor,
in
conjunction with the card
brush,
is
used
to provide timed impulses to the digit
counter magnets.
Slate
Base Relays
High speed slate
base
relays are
used
extensively in
the Type
75
machine in both the
sorting
and the
counting circuits. Their application in the sorting cir-
cuits
is
the same
as
that
in
the Type 80 machine.
In
the counting circuits, they are used predominantly
as
high speed hold relays for the card counters.
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