U.S. patent number 3,686,483 [Application Number 05/116,701] was granted by the patent office on 1972-08-22 for memory and counting device.
This patent grant is currently assigned to Kabushiki Kaisha Ricoh. Invention is credited to Minoru Umahashi.
United States Patent |
3,686,483 |
Umahashi |
August 22, 1972 |
MEMORY AND COUNTING DEVICE
Abstract
This invention relates to an electric relay circuit arrangement
for counting a pre-selected number of copies to be made in an
automatic copying machine and to store the number of copies made so
that such number is progressively indicated as the machine
continues to produce copies until the pre-selected number is
completed. The counting is accomplished by relays which are
progressively actuated by a copy actuated counting switch. The
actuated relays remain energized in self-latching circuits until
reaching of the pre-selected count restores all circuits to the
starting position. Visual indicator means are connected in parallel
to the counting relays.
Inventors: |
Umahashi; Minoru (Tokyo,
JA) |
Assignee: |
Kabushiki Kaisha Ricoh
(Ohta-ku, Tokyo, JA)
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Family
ID: |
22368707 |
Appl.
No.: |
05/116,701 |
Filed: |
December 22, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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720637 |
Apr 11, 1968 |
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Current U.S.
Class: |
377/8; 377/83;
377/52; 399/79 |
Current CPC
Class: |
G03B
17/24 (20130101); G03G 21/02 (20130101); H03K
23/74 (20130101) |
Current International
Class: |
H03K
23/00 (20060101); G03G 21/02 (20060101); G03B
17/24 (20060101); H03K 23/74 (20060101); B41l
039/02 (); H03k 023/03 () |
Field of
Search: |
;235/92SB,92K,92PE,92J |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wilbur; Maynard R.
Assistant Examiner: Gnuse; Robert F.
Parent Case Text
This application is a continuation-in-part application of my
copending application, Ser. No. 720,637; filed Apr. 11, 1968.
Claims
What I claim is:
1. An electric relay circuit arrangement for counting a
pre-selected number of copies to be made in an automatic copying
machine, comprising a power supply circuit including input and
output terminals, copy feeding means connected to the output
terminals of the power supply circuit, a copy actuated counting
switch, a first power supply conductor including a plurality of
junctions, said counting switch being connected in series between
said first power supply conductor and one output terminal of said
power supply circuit, a second power supply conductor connected to
another output terminal of said power supply circuit, a group of
unit digit counting relays connected between said first and second
power supply conductors, said unit digit counting relays comprising
normally open first contacts connected in series between said
junctions in the first power supply conductor, each of said unit
digit counting relays being connected to a respective one of said
junctions whereby the normally open first contact of a preceding
relay prepares the circuit for the next succeeding relay when the
preceding relay is energized by the closing of said counting
switch, self-latching circuit means including junctions for said
unit digit counting relays including a series connection, between
respective junctions, of second normally open latching contacts of
said unit digit counting relays, said self-latching circuit means
being connected to said one output terminal of said power supply
circuit to bypass the counting switch, selector switch means
including a common conductor for pre-selecting the desired number
of copies, said selector switch means being connected between said
common conductor and to said latching circuit means individually to
the respective junction of said unit digit counting relays, power
supply interrupting circuit means connected in series between said
common conductor and another output terminal of said power supply
circuit, whereby the copy feeding means is stopped when the
selected number of copies has been counted, and visual indicator
means connected in parallel to said counting relays, whereby said
indicator means remain energized with their respective counting
relay in the corresponding self-latching circuit means to
progressively indicate the number of completed copies.
2. The electric relay circuit arrangement according to claim 1,
wherein said power supply circuit comprises an actuator switch
connected in series between an input terminal and said one output
termina, a latching relay connected across said output terminals of
the power supply circuit and including a normally open relay
contact connected in parallel to said actuator switch for
activating the power supply circuit, said power supply interrupting
circuit means comprising relay means and normally closed contact
means connected in series between an input terminal and the other
output terminal of the power supply circuit.
3. The electric relay circuit arrangement according to claim 1,
wherein said unit digit counting relays comprise normally closed
third contacts connected in an initial energizing circuit in series
between said self-latching circuit means and said first power
supply conductor, whereby said initial energizing circuit is
interrupted when a self-latching circuit is established for each
unit digit counting relay.
4. The electric relay circuit arrangement according to claim 1,
wherein said unit digit counting relays comprise normally open
fourth contacts connected in series between said common conductor
and the respective one of said selector switch means.
5. The electric relay circuit arrangement according to claim 1,
further comprising a plurality of memory relays, said copy actuated
counting switch comprising a single pole double throw switch
connected with its single pole to said one output terminal of the
power supply circuit, said counting switch further comprising two
throw contacts, a throw arm, and means for returning the throw arm
to a home position on one of said throw contacts when the throw arm
has been actuated by a copy to contact the other throw contact
which is connected to said first power supply conductor, a third
power supply conductor connected to said one throw contact, said
memory relays being connected between the second and third power
supply conductors to form relay pairs with said unit digit counting
relays which comprise normally open fifth contacts connected in
series with a respective one of said memory relays between the
second and third power supply conductors, whereby an energizing
circuit is prepared for a memory relay when the respective counting
relay is energized by said counting switch and the memory relay is
energized when the throw arm of the counting switch is returned to
said home position.
6. The electric relay circuit arrangement according to claim 5,
wherein said memory relays comprise normally open first contacts
connected in series with said first counting relay contacts in said
first power supply conductor, whereby there are arranged two of
said normally open first contacts in series between adjacent ones
of said junctions; normally open second contacts connected in
series to form a further self-latching circuit for said memory
relays connected to said one output terminal of the power supply
circuit, and normally closed third contacts connected in series in
said energizing circuit for the respective memory relay, whereby
said energizing circuit is opened as soon as the corresponding
normally open second contact has closed the self-latching circuit
for the respective memory relay.
7. The electric relay circuit arrangement according to claim 1,
further comprising a group of tens digit counting relays connected
between a fourth power supply conductor and said first power supply
conductor, said tens digit counting relays comprising the same
contacts as said unit counting relays, release means comprising a
normally closed release switch connected in series between the
second power supply conductor and the other output terminal of the
power supply circuit, actuating means for said release switch
connected in series between the end of the second power supply
conductor and a junction in said first power supply conductor
between the normally open first contact of the last unit digit
counting relay and the normally open first contact of the first
tens digit counting relay which is also connected to the just
mentioned junction, whereby actuation of the counting switch for
the last unit digit count energizes said actuating means to
temporarily open said release switch for returning all contacts of
the unit digit counting relays to their normal position, thus
preparing the group of unit digit counting relays for a further
series of counts after the counting of a tens digit, and
self-latching circuit means for said tens digit counting relays to
bypass said counting switch.
8. The electric relay circuit arrangement according to claim 7,
wherein said selector switch means comprise switches for each of
said tens digit counting relays including a first tens digit
selector switch connected in series between the common conductor of
said selector switches for selecting unit digits and a further
common conductor of said tens digit selector switches.
9. The electric relay circuit arrangement according to claim 8,
comprising further power supply interrupting means for said tens
digit counting relays, said further interrupting means being
connected in series between the other output terminal of the power
supply circuit and said further common conductor, said further
power supply interrupting means comprising a normally closed
contact connected in series between an input terminal and the other
output terminal of said power supply circuit.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a counting and count memory device
for use in a copying machine. More specifically, the invention
relates to an electric relay circuit arrangement for counting a
pre-selected number of copies to be made on said copying
machine.
U.S. Pat. No. 2,844,317 (R. H. Shillington) describes an impulse
counting circuit comprising several relay stages. Indicator lamps
are connected to the relay stages for indicating the instantaneous
count. Preceding counts are not indicated because the preceding
lamps are disconnected, thus a continuous total count indication is
not intended.
U.S. Pat. No. 2,703280 (L. B. Butterfield et al) discloses a
counting circuit control for electro-photographic printers wherein
stepping relays advance rotary switches in response to the presence
ot a light beam. The copying is stopped when the predetermined
number of copies has been completed. However, there is no
indication of the number of copies made as the copying machine
keeps operating.
OBJECTS OF THE INVENTION
In view of the foregoing it is the aim of the invention to achieve
the following objects:
To overcome the disadvantages of the prior art;
To count and store or memorize the number of pre-selected copies
for progressively indicating the instantaneous number of copies
made;
To stop the copying operation when a pre-selected number of copies
has been completed;
To stop the copy feeding mechanism when a pre-selected number of
copies has been completed;
To provide a first relay circuit group which will count unit digits
of a pre-selected number and further similar relay circuit groups,
one group of which will count, for example, the tens digits of said
pre-selected number, whereby the circuit groups are so
interconnected with each other that a carry circuit is provided
between adjacent groups;
To employ a single-pole double-throw counting switch which is
actuated by each sheet; and
To restore the entire circuit arrangement to a zero count
position.
SUMMARY OF THE INVENTION
According to the invention there is provided an electric relay
circuit arrangement for counting a pre-selected number of copies to
be made in an automatic copying machine wherein counting relays are
connected to a relay actuating circuit through a counting switch.
Each actuated relay prepares the actuating circuit for the next
succeeding relay and each relay keeps itself energized in a self-
latching circuit until, upon reaching of a count which has been
pre-selected by adjusting a selector switch, the actuating circuit
for all energized relays is interrupted. Visual indicating means,
such as a bulb, is connected in parallel to each counting relay to
continuously and progressively indicate each copy, whereby at any
time during the copying the presently completed number of copies
may be ascertained at a glance.
The counting switch is preferably a single-pole double-throw
switch, which on the one hand energizes said relay actuating
circuit and on the other hand energizes an actuating circuit for
memory relays one of which is provided for each counting relay and
connected to a common return circuit conductor which is interrupted
when said pre-selected count is reached.
In order that the invention may be clearly understood, it will now
be described, by way of example, with reference to the single
FIGURE of the accompanying drawing illustrating an electrical
circuit diagram of a relay arrangement for counting a pre-selected
number of copies to be made in an automatic copying machine.
A power supply circuit P having input terminals E1 and E2 is shown
at the lower part of the circuit diagram. The input terminal E1 is
connected through a switch 1 for actuating the present circuit
arrangement including an automatic copy sheet feeding mechanism 4,
to a first output terminal E11. A relay contact R' is connected in
parallel to the actuator switch 1. The other input terminal E2 is
connected to the other output terminal E21 through a group of
normally closed relay contacts RC1-1; RC2-1; . . . which are
connected in parallel with each other.
The power supply circuit P further comprises a relay R connected
across the output terminals E11 and E21 for actuating its contact
R' which is a normally open contact to keep the power supply
circuit closed until resetting as will be described below. The term
"normally open" defines a contact which is open whenever its
respective relay is not energized and vice versa. The term
"normally closed" designates a contact which is closed when its
relay is not energized and open when its relay is energized.
The copy sheet feeding mechanism 4 is directly connected to the
output terminals E11, E21 through conductors 29 and 30.
A counting switch, for example, in the form of a single-pole
double-throw switch 2, has a throw arm 2' which is normally in
contact with a contact Sa. The throw arm 2' is actuated by the
feeding of a copy to move away from contact Sa and to contact
contact Sb once for each sheet. When the feeding is completed the
throw arm 2' returns to Sa. This movement of the movable throw arm
2' is possible, for example, through an operating lever and a
microswitch, whereby the lever sticks out into a delivery channel
for the copy sheets, so that when a copy sheet is fed into the
copying machine, the leading edge of the copy sheet will push the
operating lever to actuate the throw arm 2'. A spring, not shown,
returns the throw arm to its home position on contact Sa.
Selector switch means 3 comprising a plurality of switches S0, S1,
S2, . . . S20 represent a memory switch group or groups for
presetting or pre-selecting the desired number of copies. Switches
S0, S1, S2, . . . S9, are for storing unit digit numerals. Switches
S00, S10, S20, . . . are for storing tens digit numerals. Further
switch groups may be provided for storing digits in other columns.
Each switch in the unit digit group and in the tens digit group
etc. is adapted, when in its closed position, to open when any
other of the switches in the same group is closed. For example,
suppose 21 copies are desired, hence the contacts of switches S20
and S1 are closed, while all other contacts of the selector
switches are open.
A first power supply conductor 21 comprising a plurality of
junctions 21', 21" 21"', . . . is connected to the contact Sb of
the counting switch 2 and thus to terminal E11 when the throw arm
2' is in its dashed-line position.
A further power supply conductor which will be referred to as a
return conductor 22 is connected through a normally closed reset
contact 6 to the output terminal E21 of the power supply circuit P.
A reset relay 5 for the reset contact 6 and opens this contact each
time when the counting of unit digits has been completed as will be
described more fully below.
A first group of unit digit counting relays RA1, RA2, . . . is
connected on the one hand to the junctions 21', 22', of conductor
21 and on the other hand to the return conductor 22 so that these
relays may be energized by the actuation of the counting switch 2
and de-energized by opening the reset contact 6.
Each counting relay RA1, . . . has normally open contacts RAn-1,
RAn-2, RAn-4, RAn-5 and a normally closed contact RAn-3.
One of said normally open contacts of each counting relay, namely
normally open contact RA1-1; RA2-1; is connected in series between
said junctions 21', 21", . . . whereby these normally open contacts
successively prepare the energizing circuit for one counting relay
after the other step by step.
Self-latching circuit means 23 including junctions 23', 23", . . .
are provided for the unit digit counting relays RA1, . . . normally
open latching contacts RA1-2; RA2-2, . . . are connected in series
between said junctions to complete a self- latching circuit for the
counting relays between said output terminal E11 of the power
supply circuit P and the return conduit 22, whereby the counting
switch 2 is bypassed by said self-latching circuit 23.
The selector switch means S0, S1, . . . are connected between a
common conductor 24 and to the respective one of said junctions
23', 23" . . . in the self-latching circuit for the unit digit
counting relays.
Further, there are provided power supply circuit interrupting
relays RC1, RC2, . . . which are connected in series between the
common conductor 24 and the output terminal E21 of the power supply
circuit P, whereby the copy feeding mechanism will be stopped when
the selected number of copies has been counted as will be described
in more detail below. The relays RC1, RC2, . . . actuate said
normally closed contacts RC1-, RC2-1, . . . in said power supply
circuit P which are connected in parallel to each other between the
contact 6 and the input terminal E2 for re-setting the apparatus to
zero.
According to the invention visual indicator means L1, L2, . . . are
connected in parallel directly with the respective counting relay
RA1, . . . whereby the indicator means remain energized in the
corresponding self-latching circuit 23 to progressively indicate
the number of completed copies as will also be described in more
detail below.
A group of memory relays RB1, Rb2, . . . is also provided. Each of
the memory relays has normally open contacts RBn-1, RBn-2, and a
normally closed contact RBn-3. However, the last memory relay RB9
has two normally closed contacts RB9-3 and RB9-4.
As shown in the circuit diagram, one terminal of each memory relay
RB is connected through its own normally closed contact RB1-3, . .
. to a conductor 25 which is in contact with the fixed contact Sa
of the counting switch 2. The other terminal of each RB relay is
connected to the return conductor 22 and thus to contact 6 through
a normally open contact RA1-4. The counting relays RA are connected
to the fixed contact Sb through the normally closed contact RAn-3
and to the contact 6 also through return conductor 22.
Each RB relay also closes a self-latching circuit 26 through its
normally open contact RBn-2 which are connected in series with each
other between junction 26', 26" . . . of the latching circuit 26
and to terminal E11, whereby the self-latching circuit 26 is
successively extended as the counting switch arm 2' returns to its
contact Sa after each count.
The selector switch S0 is connected between the common conductor 24
and the terminal E11. The other selector switches S1, S2, . . . are
connected in series between said junctions 23', 23" . . . and a
normally open contact RAn-5 of the respective counting relay RA
which in turn is connected to the common conductor 24.
The unit digit counting circuit so far described may be used for
counting one to nine copies and to stop the sheet feeding device 4
when the pre-selected number of one to nine copies has been
made.
For making more than nine copies a further group of counting relays
RA10, RA20, . . . is provided which are connected in the same
manner as the counting relays RA1 to RA9, namely on the one hand to
the junctions along conductor 21 through respective normally closed
contacts RA10-3, RA20-3, . . . and on the other hand to a further
return conductor 32. A self-latching circuit 27 is provided for the
tens digit counting relays which is connected in the same manner as
the self-latching circuit 23 and which comprises normally open
contacts RA10-2, RA20-2, . . . connected in series between terminal
E11 and junctions 27', 27", . . .
A second group of memory relays RB1, RB2, . . . , namely on the one
hand to conductor 25 through respective normally closed contacts
RBn-3, and on the other hand to the further return conductor 32
through normally open contacts RAn-4. A self-latching circuit 28 is
also provided for the tens digit memory relays RB10, RB20, . .
.
The circuit 28 is connected to terminal E11 and comprises normally
open contacts RB10-2; RB20-2 . . . connected in series to
progressively extend the circuit 28 as the counting continues, said
contacts RB10-2, . . . being connected to respective junctions 28',
28". . . along the circuit 28.
The common conductor 24 to which the unit digit relays RA1 to RA9
are connected through the selector switches S1 to S9 and through
normally open contacts RA1-5 to RA9-5, is connected in series with
a similar common conductor 31 for the tens digit counting elements
of the circuit, by means of a switch Soo which is part of the
selector switch means 3. The two series connected conductors 24 and
31 are connected to terminal E11 of the power supply circuit P
through switch So which is also part of the selector switch means
3.
The operation of the present apparatus will now be described by
illustrating how, for example, two copies are made. First the
selector switch S2 and the switch Soo are manually closed. Then the
switch 1 is momentarily closed, whereby the sheet feeding mechanism
4 is energized as well as the relay R whereby its contact R'
establishes a self-latching circuit within the power supply circuit
P.
When now the first sheet moves the throw arm 2' momentarily from
its home position on contact Sa to its counting position on contact
Sb an energizing circuit for relay RA1 is established or closed as
follows:
--E11, 2', 21, 21', RA1-3, RA1, 22, 6, E21 --
whereby relay RA1 is energized, indicator L1 lights up, and a
self-latching circuit for relay RA1 is established as follows by
the closing of normally open contact RA1-2:
--e11, ra1-2, 23, 23', ra1, 22, 6, e21 --.
since contact S1 is open, reset relay RC1 will not be energized.
However, as the throw arm 2' returns to Sa the memory relay RB1
will be energized in the following circuit:
--E11, 2', Sa, 25, RB1-3, 26', RB1, RA1-4, 22, 6, E21 --,
whereby the memory relay RB1 establishes its own latching circuit
by closing Rb1-2:
--E11, RB1-2, 26', RB1, RA1-4, 22, 6, E21 --.
With the energizing of RA1 and RB1 completed as just described the
contacts RA1-1 and RB1-1 are closed thus preparing the energizing
circuit for the next counting relay RA2. When now the second sheet
actuates arm 2', RA2 is energized as follows:
--E11, 2', 21, 21', RA1-1, RB1-1, 21", RA2-3, 23', RA2, 22, 6, E21
--.
A similar circuit is also established for the memory relay RB2.
Furthermore, since S2 and Soo are closed the reset relays RC1 and
RC2 will also be energized thereby opening contacts RC1-1 and RC2-1
simultaneously to reset the apparatus to zero after the completion
of the second copy in this example.
The above mentioned reset relay 5 for the unit digit counting
portion of the circuit arrangement is connected between the return
conductor 22 and the normally closed contact RA10-3 of the first
tens digit counting relay RA10.
The operation of the circuit will now be described by means of an
example for preparing 21 copies. For this purpose switches S20 and
S1 in the selector switch means 3 are closed, the electric current
flows as described above in the first example to bypass the
starting switch by closing contact R'.
The electric current flows through the automatic copy sheet feeding
mechanism 4 and activates it to feed the copy sheets to the
printing section of the copying machine. As a copy sheet starts its
movement, the section of the copying machine. As a copy sheet
starts its movement, the electric current will continue to flow to
the automatic copy sheet feeding mechanism 4, unless the contacts
RC1-1 and RC2-1 are simultaneously opened. The first copy sheet
thus delivered actuates throw arm 2' of the counting switch 2,
whereby the energizing circuit for the first counting relay RA1 is
established as described above. This also applies to the circuit
for the memory relay RB1 with the relay RA1 energized, the first
count will also be indicated by the indicator lamp L1 which is
connected in parallel with RA1 to confirm the correct movement of
the relays.
Since switch S1 is closed, the closing of the contact RA1-5 will
establish a circuit for reset relay RC1 as follows:
--E11, RA1-2, 23', S1, RA1-5, RC1, RB9-4, 26, E21 --,
whereby contact RC1-1 opens. However, no reset is accomplished
because the contact RC2-1 connected in parallel to contact RC1-1
remains closed.
As the first copy sheet has passed through the counting switch 2
its throw arm 2' returns to the contact Sa. However, inasmuch as
the contact RA1-4 remains in the closed position, the electric
current flows from
--E11, Sa, RB1-3, RB1, RA1-4, 22, 6, E21 --
causing the relevant contacts RB1-1, RB1-2, of the diagram RB1 to
close while opening RB1-3. Since RB1-2 is kept closed despite
opening of RB1-3, flow of electricity to the memory relay RB1 is
maintained, thus completing the memory and counting operations for
the first copy.
The completion of the second copy establishes the same circuits as
has been described above and the counting continues until the 10th
copy is counted, whereby an energizing circuit is established for
the unit digit reset relay 5 as follows:
--E11, 2', Sb, 21, (including the series connection of the now
closed contacts RA1-1, RB1-1, to RA9-1 and RB9-1),
5, 22, 6, e21 --.
the energization of relay 5 opens its contact 6, whereby all relays
in the unit digit counting portion of the circuit arrangement are
reset to their zero, not energized position, whereby the 11th to
19th copy may now be counted in the unit digit circuit portion of
the arrangement.
The progress of these operations is always confirmable by a glance
at the indicator lamps L1, L2, . . . which is an important
advantage of the present invention. It should be noted here that
the completion of the ninth copy causes the opening of the normally
closed contact RB9-4, which is specially provided for the ninth
copy, whereby the circuit
--E11, RA1-2, S1, RA1-5, 24, RC1, RB9-4 (now open), 26, E21,
which had been formed for the first copy is opened and the contact
RC1-1 is closed, thus restoring to its original status.
When the 10th copy is counted the contact RA10-1 is kept in a
closed position by virtue of the circuit
--E11, 27, 27' , RA10, 26 E21 --,
which maintains RA10 energized. The memory relay RB10 is also
energized by the return of the throw arm 2' to its Sa position,
whereby the conductor 21 is extended by the closing of contact
RB10-1 in preparation of the 11th count.
The counting of the 11th to 19th copy is now effected through the
opening and closing movement of contacts, in the same manner as
described for copies one to nine.
The 20th copy will be counted by relays RA20 because the contacts
RA10-1 and RB10-1 will be kept closed to energize relay RA20,
whereby the contact RA20-1 will be closed. The contacts RAn and RBn
(n= 1,2, . . 9 ) are released as described above with regard to the
10th copy. In this instance, the closing of the contact RA20-2
causes the current to flow in the circuit:
--E11, 27, RA10-2, 27' , RA20-2, 27" , S20, RA20-5, RC2, 26, E21
--,
whereby reset relay RC2 is energized to open the contact RC2-1.
However, the circuit for reset relay RC1 is already interrupted by
this time by virtue of the release of RAn and RBn (n= 1, 2, . . .
9), thus RC1-1 remains closed and the 21st count can proceed.
When the 21st copy is delivered, the related contacts RA1 make
opening and closing movements in the same manner as has been
described for the first copy, and by the closing of RA1-2, current
flows in the circuit:
--E11, RA1-2, 23' , S1, RA1-5, RC1, RB9-4, 26, E21 --,
whereby relay RC1 is energized to open the contact RC1-1. Since
then the contact RC2-1 is simultaneously open, the current flow to
the automatic copy sheet feeding mechanism 4 is interrupted and the
sheet feeding operation is stopped and all circuits which had been
maintained are also released.
The gist of the foregoing is that the first count did not cause a
reset because the reset relay RC2 was not energized, whereas on
completion of the twentieth count resetting still did not take
place because relay RC1 was not energized. Stated differently,
resetting could take place only by the simultaneous energizing of
relays RC1 and RC2.
The circuit shown is capable of counting twentynine copies. The
counting capacity may be extended to include the hundreds and
further digits in a surprisingly simple manner by providing, as in
the case of the tens digit, circuit corresponding to reset relay 5
and reset switch 6. Thus, by cascading such circuits as mentioned
above, the memory and counting capacity is increased.
In addition, since closing of the contacts requires very little
power for the relays, the durability of the relays is high and
hardly any trouble is experienced with the present circuit.
Another advantage of the present invention is seen in its high
efficiency in that simultaneous with the automatic prevention of
the flow of current to the copy sheet feeding mechanism 4 upon the
completion of the feeding operation of the preselected number of
copies, zero restoration of the counting circuit is also
automatically effected. Such resetting may also be accomplished
manually, if desired, by simultaneously closing switches So and
Soo.
Another important advantage is seen in that the number of copies
being counted is continuously and progressively indicated through
indicator lamps Ln connected in parallel to the counting
relays.
Another advantage of this invention is seen in that the parts,
relays and microswitches used are in general use and no special
parts are required. Therefore, the manufacturing costs can be
reduced to a considerable extent.
Although specific examples have been described, it is to be
understood that the invention includes all modifications and
equivalents within the scope of the appended claims.
* * * * *