JPH0319544B2 - - Google Patents

Description

[Detailed description of the invention]

<Technical Field> The present invention relates to a device for identifying a copy document in a copying machine. <Prior Art> Conventionally, as a means for identifying a document placed on a document holding unit for copying, an identification device including a light emitting and light receiving device is provided to detect the presence or absence of a document or the size of the document. In this case, a big problem is when to identify the document. In other words, if the original is identified based on the operation of the print switch, the copying operation will be started even if there is no original, resulting in a wasteful copying operation. Another drawback is that it is no longer possible to select paper by detecting the document size. <Object of the Invention> The present invention adjusts the size of a document placed on a document holding section in response to detection of a closing operation of a document cover without constantly adjusting the size of a document placed in a document holding section, and adjusts the size of a copying machine according to the document size. It controls the operation of the <Example> The present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the present invention for identifying the document size, and FIGS. Figure 2 shows the maximum original size
B4, Figure 3 is for the maximum original size A3. In the figure, reference numeral 1 denotes a frame of the main body of the copying machine, which has a document holding section 2 made of transparent glass on its upper surface. This document holding section 2 is for holding a copy document, and a document cover 3 is provided on the top surface of the document holding section 2 for pressing the document against the holding surface.
is provided so that it can be opened and closed freely. Further, in the figure, reference numeral 4 denotes a detection switch provided on the upper surface of the frame 1 to face the document cover 3, and detects whether the document cover is opened or closed. If the detection switch 4 detects that the document cover 3 is closed, it lights up an auxiliary lamp 5 disposed on the back surface of the document holder 2 so as not to get in the way during exposure. Reference numeral 6 represents a light receiving element provided within the document cover 3 to receive light from the lamp 5 via the holding surface, and 7 represents a lead-out line for guiding a signal from the light receiving element to the main body of the copying machine. Although the auxiliary lamp 5 is provided separately from the illumination lamp for exposure, it is used in common with the illumination lamp, and is turned on for a certain period of time before copying when the copy switch is operated according to a signal from the detection switch 4. may be configured. In other words, the auxiliary lamp 5 and the light receiving element 6 constitute a size detecting means that detects the size of the document placed on the holding section 2, and as described above, when the detection switch 4 detects the closing operation of the document cover 3, ,
In response to this detection signal, a means (detection operation start means) not shown starts the detection operation of the size detection means, that is, the lamp 5 is turned on and size detection is executed. In the above configuration, turn on the power switch of the main body of the copying machine. Then, the document is placed on the holding section 2, and the document cover 3 is closed. As a result, the auxiliary lamp 5 is turned on to detect the size of the original, and the light from the auxiliary lamp 5 is blocked from the placed original depending on the size of the original, or the light is received by the light receiving element 6 to identify the presence or absence of the original and the original size. be done. That is, by appropriately arranging a large number of the light receiving elements 6, documents of various sizes can be identified. Examples of the above document size identification are shown in FIGS. 2 and 3. Here, one side of the document holder 2 is set as the document placement regulation position, and in this example, one side on the left side in the figure is set as the document regulation position. First, in Figure 2, this shows an example of the identification state when the maximum document size is B4.
Light-receiving elements 6X and 6Y arranged on the document cover 3 are provided near the center line of the holding section 2 and facing each other. In other words, the light-receiving element 6X is placed on the front document regulation position side of the center line and is not blocked by the A4 size document, and the light-receiving element 6Y is located behind the center line and is blocked by the A4 size document. are provided at each location. Therefore, the light receiving element 6X,
Depending on the light reception state of 6Y, the size of the original placed on the original holding section 2 can be identified as shown in Table 1 below.

[Table] In the above table, "1" means that the light receiving element 6 receives light, and "0" means that the light is blocked by the original and no light is received by the light receiving element 6. Furthermore, FIG. 3 shows an example in which the maximum size of the document held in the document holding section 2 is A3.
Light receiving elements 6X to 6Z are arranged according to the size of each document. Therefore, like the one shown in FIG. 2, it is possible to check the document size and detect the presence or absence of the document as shown in Table 2 below.

[Table] In the above example, a light-receiving element 6 and an illumination lamp 5 are provided on opposite sides of the document holder to identify the document. may be provided. As an example of this:
A light emitting section may be provided on the document cover 3 according to the size of the document, and light from the light emitting section is diffusely reflected by the placed document, and a light receiving element may be provided at a portion that receives the light. Further, the light emitting section and the light receiving section may not be provided on the document cover 3, but may be provided at different locations, and an optical fiber for transmitting light may be provided on the document cover 3. Therefore, a specific example of the document size identification in FIG. 2 is shown in FIG. In the figure, B4, A4, and B5 are signals that identify the cassette installed in the copying machine body, which will be described later. For example, if the copying machine body is equipped with a cassette that accommodates the size of B4, B4 is "1". The other A4 and B5 become "0" as a signal. To identify the cassette, a unique code is provided on the side of the cassette for storing copy sheets of a desired size, and this code is detected and identified.
Or, each cassette is provided with a cassette-specific protrusion,
When installed in the main body of the copying machine, a micro switch or the like corresponding to the protrusion may be actuated to determine the discrimination. In addition, various methods can be considered. The example shown in FIG. 4 shows an embodiment in which only one cassette can be attached to the main body of the copying machine. In FIG. 4, signals from each light receiving element 6X, 6Y provided on the document cover 3 are transmitted through a NAND gate.
_G1 , and the output of this gate _G1 is applied to a lamp drive circuit 8 which instructs no document. That is, as described above, when the document cover 3 is closed, the illumination lamp 5 is turned on by the starting means (not shown) that starts the size detection operation based on the operation of the switch. Therefore, if no original is held on the surface of the original holding section 2, light is received by both light receiving elements 6X and 6Y, and only the NAND gate _G2 becomes valid, and a signal indicating that there is no original is output from this gate _G2 . be. Further, the signals from the light receiving elements 6X and 6Y are inputted to the NAND gate _G2 via the inverters _In1 and _In2 . The output of this gate _G2 is a signal indicating the document size B4 placed on the document holding section 2. Furthermore, the NAND gate _G4 to which the signals obtained from the light receiving element 6X and the light receiving element 6Y are added via the inverter _In2 outputs (“0”) when an A4 size document is placed. Derive. The NAND gate _G6 inputs the signal from the light receiving element 6X, the signal obtained through the inverter _In1 , and the signal from the light receiving element 6. When the output of the NAND gate _G6 is "0", it is recognized that a B5 size original is placed. With this signal
A display indicating the B5 size is made. As mentioned above, the size of the placed original is detected by the output of each NAND gate G ₂ , G ₄ , G ₆ , and if there is an output from gate G ₁ , it is assumed that there is no original, and the copy is not detected. Even if I try to operate a switch, etc., the copy operation does not occur. Here, it is identified as mentioned above,
A device using this will be described below. This automatically selects copy paper. In FIG. 4, a signal recognizing the document size, particularly a signal from the NAND gate _G2 , is applied to one input terminal of the NAND gate _G3 via an inverter _In3 . Also, at the other input terminal of gate _G3 ,
Among the signals for identifying the cassette installed in the copying machine body, a signal indicating the B4 size is added. Therefore, if the original placed on the original holding unit 2 is B4 size, and the cassette installed in the copying machine is for storing B4 copy paper, the gate is closed.
_G3 is enabled and copying is executed by pressing the print switch. Here, although the output of the gate _G2 is not shown in the figure, it is used as a signal to drive an indicator lamp indicating that a B4 size original is placed on the holding section. Therefore, even if the document cover 3 covers the document, it is possible to tell at a glance what document is placed thereon. Further, the output of the NAND gate G ₄ that recognizes A4 size is applied to one input terminal of the NAND gate G ₅ via the inverter In ₄ . Also, a signal indicating cassette A4 is applied to the other input terminal of gate _G5 . Therefore, if gate G ₄ is valid,
A4 size display is made and the cassette is A4
If it is attached to the main body, gate _G5 is enabled and copying is started by pressing the print switch. Furthermore, the output of NAND gate G ₆ is a NAND gate
A signal indicating cassette B5 is input to the other input terminal of _{gate G7} . Therefore, when the gate _G7 is activated, copying is started by pressing the print switch. In the above circuit configuration, gates G ₃ and G ₅
The outputs of G and _G7 are applied to a three-input NAND gate _G8 , and the output of the gate _G8 is applied to a NAND gate _G9 . A signal from the print switch 9 is applied to the other input terminal of this gate _G9 . Further, the output of gate _G9 is applied to a copy control section 10 surrounded by a dotted line. In other words, the output end is connected to the base of the transistor Tr via a parallel circuit of a resistor and a capacitor. The emitter of the transistor Tr is grounded, and the collector is connected to the power supply +Vcc via a resistor. Further, a series circuit consisting of a relay coil 11 and a resistor whose one end is grounded is connected to the collector. The relay coil 11 has a normally open contact 11-a and a normally closed contact 11-b, and a copy control circuit 12 and an alarm lamp 13 are connected to a power source V through the respective contacts. In the above configuration, if a cassette corresponding to the size of the original placed on the original holder 2 and the size of the original is attached to the copying machine main body, a signal "1" is output from the gate G ₈ and the print switch 9 is output. In order to start the copying operation in response to the operation, a state is created that allows the copying operation. Therefore, when print switch 9 is pressed, the output of gate G ₉ becomes “0”.
(“L”), and the transistor Tr is turned off. Therefore, current flows through the relay coil 11, closing the contact 11-a and opening the contact 11-b. Therefore, when copying is started, the alarm lamp 13 goes out. Conversely, if the original size and the copy paper size do not match, the copying operation of the copying machine is prohibited, and even if the print switch 9 is pressed, the transistor Tr is turned on and no copying is performed. Therefore, by loading the correct cassette into the main body and pressing the print switch 9, copying will be executed. Figure 5 shows a circuit for automatically selecting paper based on the recognition of original size, etc. according to the present invention when cassettes containing copy paper of different sizes are installed in the upper and lower stages of the copying machine main body. FIG. That is, from among the cassettes installed in the upper and lower stages, the cassette corresponding to the size of the document placed thereon is selected and the copy paper is fed. In the figure, reference numerals 14 and 15 indicate an upper cassette discriminating circuit and a lower cassette discriminating circuit of the cassette discriminating section provided in the cassette mounting section of the main body of the copying machine. The output signals from the upper and lower discriminator circuits 14 and 15 are for each NAND gate.
Input from G ₁₀ to G ₁₅ . On the other hand, each detection signal of the original size is
The signals from each discrimination circuit are input to the other input terminals of _G10 to _G15 . Then, the outputs of the gates G ₁₀ , G ₁₁ and G ₁₂ are sent to the 3-input NAND gate G ₁₆ , and the outputs of the gates G ₁₃ , G ₁₄ and G ₁₅ are
They are respectively added to the 3-input NAND gate _G17 . The output of the gate _G16 is introduced into a drive circuit 16 for driving a paper feed roller for feeding copy sheets in the upper cassette and a copy control circuit. Further, the output of the gate _G17 is introduced to a drive circuit 17 that drives a paper feed roller for feeding copy sheets in the lower cassette and a copy control circuit. Now, an A4 cassette is installed in the upper tier, and a B5 cassette is installed in the lower tier.
Let us also consider a case where an A4 size document is placed on the document holding section 2. The A4 signal from the upper cassette discrimination circuit 4 is applied to the gate _G11 , and a signal indicating the document size A4 is outputted from the gate _G4 and inputted via the inverter _In4 to the other input terminal of this gate _G11 . Ru. Therefore, the gate
G ₁₁ is enabled and a signal is applied to the drive circuit 16 via gate G ₁₆ . Furthermore, the signal B5 is derived from the lower cassette discrimination circuit 15, but since the document is A4,
Gate G ₁₄ or G ₁₅ is not enabled, and no signal is led to drive circuit 17 from gate G ₁₇ . Therefore,
When a matching signal is output from any of gates _G10 to _G15 , which are comparison means, a selection signal is output from either sheet feeding selection means constituted by gates _G16 or _G17 , and the sheet feeding drive is performed. Either circuit 16 or 17 is selected. Furthermore, by outputting the selection signal from either of the gates G ₁₆ and G ₁₇ , the NAND gate G ₉ is output via the OR gate G ₁₈ and the inverter In ₆ .
The selection signal is supplied to the gate _G9 , and the signal from the print switch ₉ is supplied to the other input terminal _of the gate _G9 . , constitutes a control means for causing the gate _G9 to output a signal for starting the copying operation. Therefore, by operating the print switch 9, paper is fed and a copying operation is executed. It is also assumed that a B4 size document is placed on the document holding section 2, and A4 and B5 cassettes are installed in the upper and lower rows as described above. In this case, the gate
All outputs of _G10 to _G15 are "1"("H"), and outputs of gates _G16 and _G17 are "0"("L"). Therefore, no signal is applied to the upper and lower paper feed drive circuits, and no copy paper is fed. That is,
By detecting discrepancies between original size and copy paper size,
No selection signal is output from gates G ₁₆ and G ₁₇ , and the non-selection signal is output from OR gate G ₁₈ and inverter In _6.
In order to join NAND gate G ₉ through
_G9 does not output a signal to start copying operation,
Copying operations will be prohibited. Therefore, when detecting a match between the original size and copy paper size, the gate
The control means that outputs a signal to start the copying operation by the print switch/operation from _G9 is as follows:
Prohibits the start of a copy operation due to size mismatch detection. Therefore, no power is supplied to the copy control circuit 12, and the alarm lamp 13 is turned on to notify the user that a cassette of copy paper corresponding to the original size is not installed. Note that in the present invention, if a cassette containing copy paper corresponding to the original size is not installed in the copying machine main body, paper will not be fed and copying will not be performed. However, after pressing the print switch, a separately provided reset button By pressing , you can also make copies even if the size is different from the original. <Effects of the Invention> As explained above, according to the present invention, since the document size is determined in response to the detection of the document cover being closed,
For example, by driving the light emitting element to emit light, the influence of ambient light and the like is reduced, allowing accurate document size detection. In addition, it detects that the original size matches the paper size installed in the copying machine, and depending on the match detection, it is possible to select and feed the paper of that size.Furthermore, copying operations are prohibited due to mismatches, so there is no need to waste. Copying can be performed on paper according to the original size without starting a copying operation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention for identifying a document; FIGS. 2 and 3 are diagrams showing the arrangement of a detection means (light receiving element) for identifying the document size; This figure is a circuit configuration diagram showing one specific example in which the present invention is implemented based on FIG. 2, and FIG. 5 is a circuit configuration diagram showing another specific example in which the present invention is implemented. 2...Document holding section, 3...Document cover, 5...
Illumination lamp, 6... Light receiving element, 9... Print switch, 10... Copy control section, 12... Copy control circuit, 13... Alarm lamp, 16... Upper sheet feed roller drive circuit, 17... Lower feeder Paper roller drive circuit.

Claims (1)

[Scope of Claims] 1. A first detection means for detecting the size of a document placed on a holder that holds the document; and a second detection means for detecting the paper size of a plurality of paper storage means mounted on the copying machine main body. a detection means; a document cover that is openable and closable with respect to the holding section and for bringing the placed document into close contact with the holding section; a third detection means for detecting a closing operation of the document cover; 3. A starting means for starting a size detecting operation by the first detecting means in response to the detection of the closing operation of the document cover by the detecting means; a document size signal from the first detecting means; and a document size signal from the first detecting means; a comparison means for comparing the coincidence of the size signals from the second detection means; a selection means for automatically selecting the paper of the size detected by the second detection means according to the coincidence detected by the comparison means; Upon detection of a match by the comparison means, a signal for starting a copying operation is outputted to start the operation of the copying machine, while in response to detection of a discrepancy, the operation of the copying machine is started without outputting a signal for starting the copying operation. A copying machine characterized by comprising: a control means for prohibiting the copying machine. 2. A copy according to claim 1, wherein the first detection means is composed of a light emitting and light receiving element, and the light emitting element is driven to emit light in response to a detection signal from the third detection means. Machine.