MECHANICAL
AND
ElECTRICAL
PRINCIPLES
41
An impulse to the counter magnets, from the card
brush sensing a hole in the card, effects sufficient
rota-
tion of the rotor to cause the counter to add one unit.
The levers necessary to transmit the armature motion
to the adding wheels are incorporated within the
Veeder counter unit, including a mechanical carry.
Ad-
dition of one occurs directly in the units position of
the counter only. Each remaining position
is
advanced
by
a carry operation effected when the counter wheel
to
its
right moves from 9 to
O.
The spring loaded counter shaft restores the rotor to
its home position
as
soon
as
the magnets are
de-
energized. Adjustable rubber stops limit the travel of
the rotor in both directions and aid in obtaining quiet
operation.
Counter reset to zero
is
obtained manually through
a train of gears in the counting unit which mesh with
each individual counter reset gear. All counters are
re-
set simultaneously with one rotation of the reset
handle. Reset of the grand total counter in conjunc-
tion with the other counters may, however,
be
selected
at the discretion of the operator.
Figure 30.
Type
75 Card
Counter
Assembly
Reset
Interlock Contact
The reset interlock contact
is
located adjacent
to
the
counter reset lever.
When
the counter reset lever
is
operated during resetting of the counters, it causes
opening of the reset interlock contact.
Opening of this
contact breaks all machine circuits.
Counting Commutators
In addition
to
the sorting commutator, there
is
a
series of
17
additional commutators and an impulse
distributor in the Type
75
machine. These additional
units make one complete revolution for each card
cycle
and furnish timed electrical impulses which aid
in the control
. of the counting and sorting circuits.
They are housed in a cover behind the card feed maga-
zine and are gear driven directly from the main drive
shaft worm which also drives the feed knife mechanism.
Figure
31
shows
the counter commutators with the
cover removed.
The lower twelve commutators and their common
strip are assembled and keyed to a steel cylinder
as
one
unit. The contact segment of each commutator in the
unit
is
spaced 22
12
0 apart, or one cycle point. This
assembly
is,
in
turn, inserted over an insulating sleeve
on the vertical shaft of the commutator unit and
is
held in place
by
a friction lock nut. The assembly
is
adjusta:ble
as
a unit only; each commutator
is
not ad-
justable individually. However, after removing the
assembly from the vertical shaft and then removing
the large lock nut inside the common ring, each
com-
mutator and the common strip are replaceable in-
dividually.
Figure 31.
Counter
Commutators
and
Impulse
Distributor
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