JPH0434775B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a display section and an operation switch of a copying machine.

[Prior art]

Copying machines are generally equipped with a lamp display device that indicates the status, such as paper size, tray position, paper jam, presence or absence of paper, malfunction location, etc. A key switch for operating the copying machine is also provided nearby. These display lamps and key switches are installed on the control console panel of the copying machine, and are connected to the microprocessor by a connecting wire.

A conventional control device will be explained using an example of controlling a control console having 16 display sections and 16 operation switches as shown in FIG.
In the figure, 101, Q1 to Q4 are transistors that supply power for detection to the light emitting diode lighting and operation switch 105 on the control console, 102, U1 to U4 are drivers for lighting the light emitting diodes, and 103, U5 to U8 are Buffer for detecting operation switch 105, 104,D
1 to D8 are backflow prevention diodes, 106, R1
~R4 is LED limiting resistor, 107, LED1~LED
16 is a light emitting diode, 111 is a control unit, 112
1 is a control console, and 113 is a microprocessor.

When lighting the light emitting diode 107, the microprocessor 113 in the control unit controls the output of the current supply transistor 101 as shown in FIG.
The light is sequentially supplied to the light emitting diode 107 through 08. At this time, by arbitrarily turning on the driver 102, U1 to U4, an arbitrary light emitting diode 107 is turned on via the electric wire 109. Similarly, when the transistor 101 is outputting as shown in FIG. 2, when any operating switch 105 is pressed, a high potential is supplied to the signal detection buffer 103 through the signal detection wire 110, and it is determined which switch is pressed. The microprocessor 113 is caused to read the information that has been written. As described above, m current supply lines 108 and n current lead-in lines 109 are arranged in a matrix,
In the case of a control console in which m current supply lines 108 and l signal reading lines 110 are arranged in a matrix (that is, it has m×n display sections and m×l operation switches), at least m+n+l. You will need a connecting wire. Therefore, when attempting to control a larger number of display units and operation switches, corresponding connection wires are required, which has the drawback of increasing cost, assembly space, and assembly man-hours.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned defects, and an object of the present invention is to provide a control device for a copying machine that reduces costs by reducing the number of connecting wires between a control unit and a control console. do.

[Structure of the invention]

The present invention provides a copying machine having a display unit that displays the status of the copying machine and an operation unit of the copying machine.
The first signal line is provided with a plurality of first signal lines and a plurality of second signal lines constituting one matrix, and the first Each display element of the display unit lights up only when current flows from the signal line side to the second signal side, and operates only when voltage is applied from the second signal line side to the first signal line side. A current supply means that connects each operating element of the operating unit whose state can be detected as one set, and supplies current to the first signal line in a direction in which each display element of the display unit lights up; Operation element detection means for detecting the presence or absence of operation of each operation element of the operation section are respectively connected, and a voltage capable of detecting the operation state of each operation element of the operation section is applied to the second signal line. an operating element voltage applying means for applying a current to each display element of the display section, and a current drawing means for causing a current to flow through each display element of the display section, and the current supplying means and the current drawing means, the operating element detecting means and the operating element voltage applying means. It is configured to include a control means for controlling on/off by shifting the phase.

[Effect]

In this invention, a second signal line is provided from the first signal line side to the intersection position of the plurality of first signal lines and the plurality of second signal lines constituting one matrix.
Each display element of the display unit lights up only when current flows to the signal line side of the display unit and the first signal line from the second signal line side
Since each operating element of the operating unit whose operating state can be detected only when a voltage is applied to the signal line side of the display unit is connected as a set, multiple display elements of the display unit and multiple operating elements of the operating unit can be detected. The signal lines for displaying or controlling the operation elements are a plurality of first signal lines and a plurality of second signal lines constituting one matrix.
The number of signal lines required can be significantly reduced compared to the conventional method, and significant reductions in cost, assembly space, and assembly man-hours can be realized.
The control means also includes a current supply means for supplying current in a direction in which each display element of the display section lights up, a current drawing means for supplying current to each display element of the display section, and each operation of the operation section. By controlling the operating element voltage applying means for applying a voltage capable of detecting the operating state of the element and the operating element detecting means for detecting the presence or absence of operation of each operating element of the operating unit on and off by shifting the phase, Even if each display element of the display section and each operation element of the operation section constitute the same matrix, the display operation of the display section and the operation operation of the operation section can be performed substantially simultaneously.

〔Example〕

The present invention will be explained below based on the embodiments shown in FIGS. 3 and 4.

For example, in the case of a control console that has 16 display units and 16 operation switches, when trying to turn on the light emitting diode 309, the microprocessor 303 in the control unit 301
A signal is supplied to the light emitting diode 309 through the electric wire 312 by turning on the current supplying transistors Q1 to Q4, 304 with their phases shifted in time according to the timing shown in FIG. At this time, the microprocessor 303 synchronizes necessary portions of the current drawing transistors 307 and Q5 to Q8 with the turning on of the current supplying transistor 304, and turns them on. Then, the current supplied to the light emitting diode 309 flows through the electric wire 313 to the current drawing transistor 307, so that the light emitting diode 309 can be lit in accordance with the output of the microprocessor. Incidentally, when the light emitting diode 309 is turned on, the operation switch detection buffer 305 and the operation switch detection power supply transistor 306 are both controlled to be in the OFF state by the microprocessor. Furthermore, when detecting the operating switch, both the current supply transistor 304 and the current drawing transistor 307 are turned off, and the operating switch detection power supply transistors Q9 to Q12,
The microprocessor is controlled to operate 306 as shown in FIG. When any of the operation switches 311 is pressed, the operation switch detection power supply transistor 306 connects the operation switch detection buffer 3 via the electric wire 313, the backflow prevention diode 310, the operation switch 313, and the electric wire 312.
A high voltage is applied to 05 and read as a signal into the microprocessor.

〔Effect of the invention〕

As explained above, according to the present invention, from the first signal line side to the second The operating state can be detected only when each display element of the display unit lights up only when current flows to the signal line side and voltage is applied from the second signal line side to the first signal line side. Since each operating element of the operating unit is connected as a set, the signal lines for displaying or controlling the multiple display elements of the display unit and the multiple operating elements of the operating unit can be connected to one matrix. Only a plurality of first signal lines and a plurality of second signal lines are required, and the number of signal lines can be significantly reduced compared to conventional methods, resulting in significant reductions in cost, assembly space, and assembly man-hours. can be realized.

The control means also includes a current supply means for supplying current in a direction in which each display element of the display section lights up, a current drawing means for supplying current to each display element of the display section, and each operation of the operation section. By controlling the operating element voltage applying means for applying a voltage capable of detecting the operating state of the element and the operating element detecting means for detecting the presence or absence of operation of each operating element of the operating unit on and off by shifting the phase, Even if each display element of the display section and each operation element of the operation section constitute the same matrix, the display operation of the display section and the operation operation of the operation section can be performed substantially simultaneously.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional copying machine control device, Fig. 2 is a timing chart of Fig. 1, Fig. 3 is a circuit diagram showing an embodiment of the present invention, and Fig. 4 is a timing chart of Fig. 3. It's a chat. Explanation of symbols, 301...control unit, 302...control console unit, 303...microprocessor, 304...current supply transistor, 3
05... Operation switch detection buffer, 306...
...Power supply transistor for operation switch detection, 3
07... Current drawing transistor.

Claims (1)

[Claims] 1. A copying machine having a display section for displaying the status of the copying machine and an operation section of the copying machine, comprising a plurality of first signal lines and a plurality of second signal lines constituting one matrix, Each display element of the display unit lights up only when a current flows from the first signal line side to the second signal line side at the intersection point where these first signal line and second signal line intersect. and each operating element of the operating unit whose operating state can be detected only when a voltage is applied from the second signal line side to the first signal line side are connected as a set, and the first signal A current supply means for supplying a current to light up each display element of the display section, and an operation element detection means for detecting whether or not each operation element of the operation section is operated are connected to the line, respectively. Second
Connected to the signal lines are an operating element voltage applying means for applying a voltage that can detect the operating state of each operating element of the operating section, and a current drawing means for passing a current through each display element of the display section. A control device for a copying machine, further comprising a control means for controlling on/off the current supply means and the current draw means, the operating element detecting means and the operating element voltage applying means by shifting their phases.