JPH0253786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that performs a copying operation in accordance with a numerical value set in an electronic counter.

In recent years, copying machines have been provided that use an electronic counter instead of a mechanical rotary counter to set the number of copies. For this type of electronic counter, numerical values are normally set using a numeric keypad, but although the numeric keypad simplifies operation, it requires a large installation space, especially for small copy machines. However, most of the operation panel is occupied by the numeric keypad, which limits the space available for other operation keys, which not only creates design problems, but also impedes miniaturization of the copier itself. had.

The present invention has been made with attention to these points, and an object of the present invention is to provide a copying machine in which numerical values can be set on an electronic counter using a small number of operation keys.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 1 is a DC power supply with an appropriate voltage;
2, 3, 4, 5 are 2-input NAND gates, 6 is 4-input NAND gates, 7 is 3-input NAND gates, 8,
9, 10, 11, and 12 indicate inverters, respectively.

For example, 13 is a decimal up-down counter,
The terminals of this up-down counter 13 are count-up input terminals, terminals are count-down input terminals, terminals are load input terminals, terminals are reset input terminals, each terminal is a binary coded decimal output terminal, and is a data input terminal. It is a terminal. The up-down counter 13 operates under the condition that the three input voltages at each terminal are "H".
And if the terminal voltage is "H", the output voltages of the binary coded decimal output terminals, . . . are all "L". Also, when the input voltage of the terminal is "L", the voltage of the terminal is applied to the terminal, the voltage of the terminal is applied to the terminal, the voltage of the terminal is applied to the terminal, and the voltage of the terminal is applied to the terminal.
The voltage at the terminal remains at the terminal, and the data input is transferred to the output terminal.

14 is a display provided on the operation surface of the copying machine;
The display body 14 is composed of display segments, for example, and is driven by output signals from the respective output terminals of the up-down counter 13,
The contents of the counter 13 are displayed. Note that since the configuration and operation of the display segment are conventionally known, detailed explanation will be omitted.

Reference numeral 15 is a reset switch that is normally open, and when closed, sets the display content on the display 14 to "1" and stops continuous copying. Reference numeral 16 is normally closed, and when opened, the display content is set to "1" and stops continuous copying. A count-up switch 17 increments the number displayed by 1, and a print switch 17 which is normally open and when closed, energizes the relay 18 and starts the copying operation. Each of these three switches 15,1
Reference numerals 6 and 17 are provided on the operation panel of the copying machine, and all are manual and a rebound type is used. Reference numeral 19 denotes a document stand position switch which is normally open and closes when the document table (not shown) of the copying machine deviates from its normal position;
21 is a countdown switch that is normally closed and opens only for a short time during the period when the document table is out of the normal position in normal operation; 21 is the countdown switch 20 which is normally closed and remains open during the period when the document table is out of the normal position in normal operation. This is a multi-copy switch that opens for a short period of time before opening.

Note that 22a, 22b, 23...27 are resistors each set to an appropriate resistance value, 28 is a transistor, and 29 is a capacitor. Further, A is a paper feeding device controlled by the relay 18 described above.

Next, the operation of the preset counter device having the above configuration will be explained.

It is now assumed that, for example, the number "5" is displayed on the display screen 14, the reset switch 15 and the print switch 17 are open, and the capacitor 29 is charged to an appropriate voltage.

In such a state, both input voltages of NAND gate 2 are “H”, so NAND gate 2
The output voltage of the up-down counter 13 is "L", and therefore the input voltage of the reset input terminal of the up-down counter 13 is "L".

Furthermore, when the count-up switch 16 is closed, the input voltage of one of the input terminals of the NAND gate 3 becomes "L", so the output voltage of the NAND gate 3 becomes "H", and this output voltage is the same as that of the up-down counter 13. Added to the count up input terminal. More countdown switch 2
0 is closed, the input voltage of one of the input terminals of the NAND gate 4 becomes "L", so the output voltage of the NAND gate 4 becomes "H", and this output voltage is applied to the countdown input terminal of the up-down counter 13. has been added.

On the other hand, since the content of the up-down counter 13 is "5", the output voltage of the output terminal of the counter 13 is "H", the output voltage of the output terminal is "L", the output voltage of the output terminal is "H", and the output The output voltage of the terminal is "L", and the output voltages of the inverters 9, 10, 11, and 12 are "L", "H", "L", and "H", and the output of the NAND gate 6 The voltage becomes "H", this output voltage is applied to the load input terminal of the up-down counter 13, and the contents of the up-down counter 13 are held.

A case will be described in which only one copy is made in the above state. First, when the reset switch 15 is operated and closed, the voltage at one input terminal of the NAND gate 2 changes from "H" to "L", and the output voltage of the NAND gate 2 goes "H".
Therefore, the up-down counter 13
The input voltage of the reset input terminal also changes from "L" to "H". At this time, the input voltages of the count-up input terminal, count-down input terminal, and load input terminal of the up-down counter 13 are "H", so the output voltages of the output terminals, , , , etc. are all "L", and so on. As a result, the output voltages of the inverters 9, 10, 11, and 12 are all "H", and the output voltage of the NAND gate 6 is "L", which are applied to the load input terminal, and the numerical value displayed on the display 14 is changed to "0". ”. Next, when the closed reset switch 15 is opened,
Since the voltage at one input terminal of the NAND gate 2 changes from "L" to "H" again, the output voltage of the NAND gate 2 becomes "L" and the input voltage at the reset input terminal of the up-down counter 13 also becomes "L". . At this time, since the input voltage of the load input terminal of the counter 13 is "L", among the output terminals of the counter 13, only the output voltage of the output terminal becomes "H", and the other output terminals, The output voltage of , becomes "L". Therefore, the display content of the display body 14 becomes the numerical value "1". On the other hand, the output voltage of inverter 9 is "L", and each output voltage of inverters 10, 11, and 12 is "H"
Therefore, the output voltage of the NAND gate 6 becomes "H", and this output voltage is applied to the load input terminal. As a result, the display 14 continues to display the numerical value "1".

At this point, to start copying, turn on print switch 1.
7 is operated and closed, the relay 18 is activated, and one sheet of copy paper (not shown) is supplied from the paper feeder A, and the document table (not shown) moves in a predetermined direction. As the document table moves, the switch 19 is closed and the voltage at one input terminal of the NAND gate 3 becomes "L", but since the output voltage of the NAND gate 3 is already "H", the contents of the counter 13 do not change. . Furthermore, as the document table moves, the multi-copy switch 21 opens, and the voltage at one input terminal of the NAND gate 5 becomes "H". However, if the content of the counter 13 is "1", as described above, the output terminal... The output voltage of the inverters 10, 11, and 12 becomes "H", and the output voltage of the NAND gate 7, that is, the voltage at the other input terminal of the NAND gate 5 becomes "L".
Therefore, the output voltage of the NAND gate 5 is "H",
Since the output voltage of the inverter 30 is “L”,
The transistor 28 is not conductive, and therefore the relay 18 is energized only when the printed switch 17 is closed.
The process ends with one copy operation. Note that during the above operation, the countdown switch 20 opens, the voltage at one input terminal of the NAND gate 4 becomes "H", and as the switch 19 closes as described above, the output of the inverter 8 decreases. The voltage becomes "H" and is applied to the other input terminal of the NAND gate 4. Therefore, the output voltage of the NAND gate 4, that is, the input voltage of the countdown input terminal of the counter 13 changes to "L", and by closing the countdown switch 20,
It changes from “L” to “H” again. As a result, the output voltages of the output terminals of the counter 13 all become "L", and the display content of the display 14 becomes the numerical value "0". However, when the output voltages of all the output terminals become "L", the output voltages of the inverters 9, 10, 11, and 12 become "H", and the output voltage of the NAND gate 6 becomes "L".
This output voltage is applied to the load input terminal. In this state, the input voltage of the reset input terminal of the counter 13 is "L", so the output voltage of the output terminal is "H", the output voltages of the other output terminals are "L", and the display The display content of 14 changes instantaneously from the numerical value "0" to "1", and it is recognized as if the numerical value "1" is continuously displayed.

Next, a case will be described in which, for example, three copies are made in succession. In this case, the count-up switch 16 is opened and closed twice. First, when the count-up switch 16 is opened for the first time, the input voltage of one of the NAND gates 3 becomes "H", and since the document table is also in the fixed position, the switch 19 is opened.
remains open and the other input voltage of the NAND gate 3 also becomes "H", so the output voltage of the NAND gate 3 becomes "L". However, when the count-up switch 16 closes again, the output voltage of the NAND gate 3 becomes "H". Note that counter 1 at this time
Both the countdown input terminal voltage and the load input terminal voltage of No. 3 are in the "H" state, and the reset input terminal voltage is in the "L" state. Therefore, only the output voltage of the output terminal is "H", and the output voltage of the other output terminals is "H".
The output voltage of , becomes "L", and the numerical value "2" is displayed on the display 14. Furthermore, when the count-up switch 16 is opened for the second time, the output voltage of the NAND gate 3 changes from "L" to "H" at the moment the count-up switch 19 is closed, and the output voltage of the output terminal increases. “H”
Then, the output voltage of the other output terminal is set to "L", the display content of the display 14 is incremented by one, the numerical value "3" is displayed on the display 14, and the load input terminal of the counter 13 is The voltage and the output voltage of the NAND gate 7 are held in the "H" state.

In the above conditions, to start copying,
When the print switch 17 is closed, the relay 18 is activated, the first sheet of paper is fed from the paper feeder A, and the document table is moved. As a result, the multi-copy switch 21 opens and the input voltage of one of the NAND gates 5 becomes "H", and the other input voltage is "H" as well as the output voltage of the NAND gate 7, so the output voltage of the NAND gate 5 becomes "H". L",
The output voltage of the inverter 30 becomes "H", and the transistor 29 is turned on. Therefore, the relay 18 is activated again, the second sheet of paper is supplied from the paper feeder A, and the copying operation for the second sheet is started. On the other hand, as the document table moves, the countdown switch 20 opens and closes, so one input voltage of the NAND gate 4 changes from "H" to "L", and the other input voltage remains "H" while the document table moves. Therefore, the output voltage of the NAND gate 4 changes from "L" to "H". At this time, the count-up input terminal voltage and load input terminal voltage of the counter 13 are both “H”,
The reset input terminal voltage is in the "L" state. Therefore, the contents of the counter 13 count down, the output voltage of the output terminal becomes "H", all other output terminals become "L", and the display content of the display 14 decreases by the numerical value "1". , the numerical value "2" indicating the end of copying the first sheet is displayed.

Then, when the copying operation for the second sheet is started and the document table is moved from the predetermined position, the multi-copy switch 21 is opened and the transistor 28 is turned on, as in the case of the first sheet. , the relay 18 is activated again, the third sheet of paper is supplied from the paper feeder A, and the copying operation for the third sheet is started. On the other hand, the countdown switch 20 opens and closes as the document table moves, the output voltage of the NAND gate 4 changes from "L" to "H", and only the output voltage of the output terminal of the counter 13 becomes "H", and the output voltage of the other output terminals changes from "L" to "H". , , output voltage becomes "L". Therefore, the display content of the display 14 further decreases by 1, and displays the numeric value 1, which indicates the end of copying the second copy, and the output voltage of the NAND gate 7, that is, the other input of the NAND gate 5. The voltage becomes "L".

Finally, when the copying operation for the third sheet is started and the document table is moved from the predetermined position again, the multi-copy switch 21 is opened and the voltage at one input terminal of the NAND gate 5 becomes "H". However, since the other input terminal voltage is "L", the transistor 29 is turned off. Therefore, the operation of relay 18 is stopped.
On the other hand, as the document table moves, the countdown switch 20 opens and closes, and the output voltage of the NAND gate 4 changes from "L" to "H". The display content changes to the numerical value "1" immediately after the numerical value "0" is displayed. The voltage at the load input terminal of the counter 13 becomes "H" and the voltage at the other input terminal of the NAND gate 5 becomes "L" to wait for the next copying operation. Further, a capacitor 29 is included so that the counter 14 always displays "1" when the power is turned on. Now, when the power is turned on, the voltage across the capacitor 29 instantaneously becomes 0 volts, so one of the inputs of the NAND gate 2 becomes "L", and the NAND output, that is, the reset input terminal 7 of the counter 13 becomes "H" and the reset switch is turned on. 15, the display on the display 14 becomes "1".

In addition, in the above embodiment, the counter 13 is 10
Although the explanation has been made using a forward up/down counter, the forward number of the counter may be changed as appropriate.

As explained above, according to the present invention, the numerical values for the electronic counter 13 can be set by turning on and off the count-up switch 16, and the key arrangement can be extremely simple. This has excellent practical effects for copying machines.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing one embodiment of the present invention. 3...Nand gate, 13...Decimal up/down counter, 14...Display body, 16...Count up switch, 17...Print switch, 1
9...Fixed position detection switch, 20...Countdown switch.

Claims (1)

[Claims] 1. A copying machine equipped with an electronic counter and a control means for executing a copying operation in accordance with a numerical value set in the electronic counter and stopping the copying operation when the set number of copies have been completed. A self-resetting switch means is provided as a means for inputting a numerical value to the counter, and the switch means and the electronic counter are associated with each other so that the set value of the electronic counter increases by "1" each time the switch means is operated. Characteristic copying machine.