KR910005593B1 - Automatic sensing apparatus of manuscript size - Google Patents

Abstract

a pair of light emitting members (3) and light receiving members (4) disposed to the lower of the cover (18); an exposure lamp (1) formed to horizontally move from the initial position to the detecting position. The document size is detected by detecting the state of the light receiving member (4). The light receiving member (4) detects light emited from the light emitting member (3) when the cover (18) is moved to the closed position, and reflecting light emited from the exposure lamp (1) when the cover (18) is moved to the open position.

Description

Original size automatic recognition device

1 is a schematic structural diagram of an embodiment of a copying machine according to the present invention.

2 is an operation state diagram according to a method for recognizing a document size by an exposure lamp, where (A) is an initial position (B) is a schematic diagram showing a document size recognition position.

3 is a schematic diagram showing an operating state according to a method for recognizing a document size by a light emitting body in a document cover.

4 is a display diagram according to the original size and the position of the light receiving element.

5 is a waveform diagram of a recognition signal with the document cover closed.

6 is a waveform diagram of a recognition signal with the document cover open.

7 is a block diagram of a control circuit of a copying machine according to the present invention.

8 is a circuit diagram showing an embodiment of the control circuit of FIG.

9 is a flowchart showing a control procedure in recognizing document sizes of a copying machine according to the present invention.

FIG. 10 is a diagram showing the relationship between the size of the sensing document and the light receiving element input port of the microcomputer as a logic value in the present invention.

* Explanation of symbols for main parts of the drawings

1: Exposure lamp part 2A, 2B, 2C and 2D: Mirror

2E: Lens 3: Light Emitting Body

4 light receiving element 5 charger

6: developing device 7: photosensitive drum

8: transfer machine 9: cleaning device

10: paper feed device 11: fixing unit

12: discharge tray 13: the first tray

14: second tray 15: original cover detection switch

16: Original position detection switch 17: Original

18: Document Cover 19: Document Cover Projection

20: micom 21: light receiving element buffer

22: exposure lamp driving circuit 23: original detection position switch circuit

24: original cover detection switch circuit 25: exposure lamp driving circuit

26: exposure lamp unit feeder driver 27: document detection failure alarm circuit

29: copy paper 31: buzzer

32: LED

The present invention relates to a copier, and in particular, to automatically recognize the size of the original to be copied in the copier, the automatic copy size recognition device of the copier eliminates the inconvenience of manually setting the size of the original to copy each time the user copies It is about.

In the copier, a general document size adjustment method is a method of manually setting A4, A3, A5, etc. according to the size of an original to be copied, and several partially automated methods are used. That is, according to the related art, a method of determining the type of a predetermined paper cassette by operating the contact switch by the projection of the paper cassette, determining the size of the copy paper by using an optical element, and manually setting the size of the copy document. There is a method for automatically supplying copy paper that matches the copy original size set in a predetermined paper cassette. However, it does not have a function to automatically judge the size of the original to be copied, and when the size of the original to be copied frequently changes, the inconvenience of having to set the original size every time is caused. When the setting is incorrect, there is a drawback of waste of copy paper.

Accordingly, an object of the present invention is to provide a document size automatic recognition device which automatically recognizes a size of an original to be copied in a copying machine and automatically performs a selection of copy papers appropriately for the size of a recognized copy original.

In order to achieve the above object, according to the present invention, a predetermined light receiving element is fixed to a copier mechanism under an exposure lamp so as to detect a size of an original to be copied, and when a document cover is closed, a predetermined light emitting element is provided in the cover. To operate only the light-receiving elements outside the original size, so as to detect a predetermined size of the document, and when the document cover is opened, the exposure lamp emits light to be moved to the position of the light-receiving element so that the light reflected by the radiation source causes the light-receiving element Since the light emitted from the outside of the original is not reflected by the light receiving element through the original glass, the light receiving element is not operated so as to detect a predetermined original size.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a view showing a schematic structure according to an embodiment of an applied copying machine of the present invention, wherein four mirrors in which the light reflected by the document 17 is combined when the exposure lamp of the exposure lamp unit 1 is turned on. A predetermined latent image is formed on the photosensitive drum 7 which has passed through the fields 2A-2D and the lens 2E and is charged with a uniform charge by the charger 5. When the toner of the developing device 6 adheres to the sheet on the photosensitive drum, the copy paper selected through the first tray 13 or the second tray 14 is prohibited, so that the toner attached to the photosensitive drum is transferred to the transfer machine 8. Is attached to the copy paper. The toner-coated copy paper is moved by the paper conveying apparatus 10 and the toner is fused to the copy paper by the heat and pressure of the heater roller in the fixing unit 11, and is transferred to the discharge tray 12. The cleaning device 9 cleans the residual toner on the photosensitive drum.

In the copying machine according to the present invention, in addition to the above-described conventional configuration, a light emitter 3 is provided inside the document cover 18 as a means for recognizing the document size, and light emitted from the document cover is closed. Blocked or transmitted by the 17 to detect the light receiving element (4) installed in correspondence with the light emitting body 3, and forms a document cover projection 19 on one side end of the document cover (18) Thus, the open / closed state of the document cover can be detected by the document cover switch 15 installed corresponding to the document cover protrusion 19. When the document cover is opened, the light source of the exposure lamp unit 1 is used. In order to move the exposure lamp to a position that the light receiving element 4 can detect, the document position detection switch 16 is operated to recognize the document size. Here, the pair of light emitters 3 and light-receiving elements 4 and the document position detecting switch 16 formed corresponding thereto are fixed at a predetermined position and have a predetermined document size (for example, , A4 or B5, etc.), and the positions of the light emitting elements, the light receiving elements, and the original position detecting switches should be installed at predetermined positions according to the type of originals to be copied.

Therefore, referring to FIG. 4, an arrangement example of the light receiving element 4 and the light emitting element 3 is shown when the size of the original to be copied is made into four types of B5, A4, B4 and A3 which are commonly used. That is, four pairs of light receiving elements 4a-4d and 4a'-4d 'are arranged in the document glass according to the above four kinds of original sizes, and one light receiving element corresponds to each end of each paper size. It is arranged just outside the original document size. In addition, four pairs of light-emitting bodies (when the original cover is closed) must be disposed inside the document cover corresponding to the four pairs of light receiving elements. Herein, the LED and the phototransistor may be used for the light emitter and the light receiving device, and any other devices having the same function may be used easily.

7 is a block diagram of a control circuit of a copying machine according to the present invention, and shows an example in which four kinds of document sizes are recognized as described above. Each of the four pairs of light receiving elements 4a-4d and 4a'-4d 'and the light emitting elements 3a-3d and 3a'-3d' respectively correspond to the corresponding light receiving element buffers 21a-21d 'and light emitting driver 22a-22d. ') Is connected to the corresponding input / output port of the microcomputer 20. The microcomputer controls the automatic document size recognition apparatus according to the present invention so that the copying process proceeds according to the control procedure as shown in FIG. 9, and an input signal through the light receiving element and input from various switches described below. Determine the size of the original placed on the platen glass for copying as a signal. From the microcomputer 20, an original position detecting switch circuit 23 and an original cover detecting switch circuit 24 are connected to the input end side thereof, and the exposure lamp driving circuit 25, the exposure lamp driver conveying device driver 26 and the document are connected. The detection failure alarm circuit 27 is connected to the output end side thereof. The document detection failure alarm circuit is configured of a predetermined buzzer or LED and has a function of alarming the failure of document detection. The exposure lamp driving circuit turns on / off the exposure lamp 1 under the control of the microcomputer. The exposure lamp conveyance device driver 26 has a function of moving the exposure lamp in the original direction or returning to the original position when the method for recognizing an original size by the exposure lamp is applied as shown in FIG.

FIG. 8 is a detailed circuit diagram showing an embodiment of the control circuit according to FIG. 7, and as shown, resistors R1-R13, transistors Q1-Q4, buzzers 31, LEDs 32 for alarms, and the like. It consists of an original position detecting switch 16 and an original cover detecting switch 15. The supply power supply voltage uses a typical + 5V. In addition, the same reference numerals as in FIG. 7 are configured to mean the same components.

In the present invention, the document size recognition differs depending on the case in which the document cover 18 is closed or the document cover 18 is open. When the document cover 18 is closed, the light emitter 3 inside the document cover 18 is operated to distinguish between the white cover of the document cover and the document so that light from the light emitter of the outer portion of the document size is transmitted to the light receiving element 4. Through the document position detecting switch 23, the document cover is closed in the state where the document cover protrusion 19 on one side of the document cover 18 is operated as the document cover detecting switch 15 as shown in FIG. When the high signal of the input port P3-0 + 5V of the microcomputer 20 is input, the microcomputer 20 outputs the high state of the output ports P20-27 to operate the light emitting device driver 22 to emit light. The light is blocked by the document 17 to the light receiving element located inside the original size, and the light receiving element outside the original size is in contact with the light is operated by the light receiving element buffer 21 through the input port of the microcomputer 20 ( P10-P17).

As shown in FIG. 4, eight of the light receiving elements 4 are used for detecting B5, 4b and 4b 'for A4 detection, 4c and 4c' for B4 detection, and 4d and 4d 'for A3 detection. When the A4 size document is set, 4a · 4a 'and 4b · 4b' of the light-receiving element 4 block the light of the light-emitting body 3 in the original and are turned off, and 4c · 4c ', 4d · 4d 'is not covered by the manuscript and is warmed.

Referring to the circuit configuration of FIG. 8, when the light receiving element 4 is turned off, when viewed from one block of the light receiving element buffer 2, no voltage is applied to the base of the transistor Q1, and thus the transistor Q1 is turned off and the microcomputer input port is turned off. When the light receiving element 4 is turned on, 5V is applied to the resistor R1 connected to the base of the transistor Q1, and 5V is applied to the resistor R1 connected to the base of the transistor Q1. Q1) is turned on so that the zero volt, the low signal, is applied to the microcomputer port. Recognition of the original size by the ON / OFF state of the light receiving element 4 for detecting the original size is input to the input ports P10-P17 via the buffer 21 and the input of the original cover detection switch circuit 24. If the state of the port P31 of FIG. 10 is shown to be 1 and the state of the light receiving element input port PP is not the same as that of FIG. 10, it is judged as an original setting error, and the document detection failure alarm circuit 27 is driven to correct. Can be.

In order to improve the point that the light of the light emitting body 3 cannot see the original when the document cover 18 is open, the light of the exposure lamp unit 1 is reflected by the original and touches the light receiving element so that the original size In operation 2, the document cover detection unit 15 is turned off, the exposure lamp driver 25 is turned on, the exposure lamp is turned on, and the exposure lamp driver device 26 is exposed. When the lamp unit moves in the direction of the original detection 16 to reach the original detection position, the light reflected by the original is detected as the light receiving element 4. The light from the outside of the document is transmitted through the document glass so that the light receiving element is turned off, and the light inside the original size is reflected by the original and the light receiving element 4 is turned on.

As an example of A4, in Fig. 6, the light receiving elements 4a, 4a ', 4b, 4b' are turned on and 4c, 4c ', 4d, 4d' are turned off, and the original is recognized. When the original is detected, the exposure lamp unit transfer device driver 26 is driven to move the exposure lamp unit 1 to the initial position. The signal for this is shown in FIG.

In FIG. 8, as an example of the circuit configuration, the light receiving element buffer 21 connects the pull-down resistor R2 and the pull-up resistor R3 by connecting the driver resistor R1 to the base of the transistor Q1 in the case of the phototransistor. When the collector of the transistor Q1 is connected to the microcomputer port and the light receiving element 4 is turned on, the transistor Q1 is turned on so that the port is turned on. When the light receiving element 4 is turned off, the transistor Q1 is turned off. Through the resistor R3, 5V is applied to the port input, and the “high” is input. The light-emitting driver 22 is composed of a driver resistor R4, a pull-down resistor R5, a transistor Q2, and a current limiting resistor R6 when the LED is used as a light emitter. The LED is turned on when the light is output, and the exposure lamp feeder driver 26 outputs the drive signal (port P3-3) and the direction setting port (P3-4) from the microcomputer. And an alarm sound generation unit composed of (R9, R10), transistor (Q3), and a buzzer, and a display portion composed of resistors (R11, R12, R13), transistor (Q4), and a display LED.

In the present invention, the operation state of the microcomputer starts copying in Fig. 9, and the open / close state of the document cover detecting switch 15 is set to the signal of the switch input port P3-0. When the cover is closed, the cover is closed. Therefore, the document detection method using the light emitting body 3 of the document cover is performed. If the document cover detection switch 15 is turned off and is yellow, the document detection method using the exposure lamp is used. The flow chart to perform is shown.

As described above, the present invention can automatically recognize the size of the original to be copied when the copying machine intends to make a copy, and the corresponding copy paper is automatically selected. The inconvenience of having to set up is eliminated, and the waste of paper due to misoperation of the paper size can be greatly reduced, so that the use of the copier can be made convenient and profitable.

Meanwhile, in the above-described embodiment, the paper size is limited to four types of B5, A4, B4, and A3. However, the paper having different sizes may be recognized depending on the position or the number of installation of the light emitting element and the light receiving element. It will be readily understood by one of ordinary skill in the art that this will be possible. In the embodiment, the light emitting element and the light receiving element are LEDs and phototransistors, but they may be ordinary lamps, photodiodes or CDS elements.

Claims (3)

In the copying machine, at least a pair of light emitting bodies are arranged at a predetermined position of the inner lower end of the copy document cover 18, and the same number of light receiving elements as the light emitting bodies are disposed below the document table corresponding to the light emitting bodies, and an exposure lamp is provided. The unit 1 is configured to be moved horizontally from a preset initial position at a top of the quenching element to a predetermined document sensing position, and emits light from the light emitting emitter inside the document cover when the document cover 8 is closed. The light is blocked or transmitted according to the size of the original to determine the size of the original to be copied according to the state detected by the light-receiving element, and the exposure lamp unit 1 is predetermined when the original cover 18 is opened. The light emitted from the exposure lamp portion is reflected by the document to be detected by the light receiving element. Automatic document size recognition apparatus characterized as adapted to determine the size of the original radiate. The document size according to claim 1, wherein the light emitting element and the light receiving element disposed corresponding thereto are arranged so that at least as many kinds of the kind according to the size of the original to be copied are arranged at a predetermined position corresponding to the size of the original. Automatic recognition device. In the copier, at least a pair of light emitters corresponding to the number of types according to the size of the copy document, a light emitter driver corresponding to the number of the light emitters connected to the light emitters to drive the light emitters, and the light emitters are disposed respectively. A light receiving element, a light receiving element buffer corresponding to the number of light receiving elements connected to the light receiving element and amplifying a signal output from the light receiving element, and a signal output from the light receiving element buffer by controlling the light emitting driver. A microcomputer that collectively controls all operations of the copier while providing data necessary for size recognition, a document detection failure alarm circuit 27 that alerts the document detection failure under the control of the microcomputer, and the document under the control of the microcomputer When the document size recognition operation is performed by the exposure lamp while the cover is open, the exposure is performed. An exposure lamp driver 26 for controlling to move horizontally or to return to the initial position of the document; and an exposure lamp driver circuit 25 for turning on or off the exposure lamp under the control of the microcomputer. And a document position detecting switch circuit 23 and a document cover detecting switch circuit 24 which are connected to the micom and provide a predetermined signal to the microcomputer according to the state of the switch for the function of document position detection and document cover detection. Original size automatic recognition device, characterized in that configured.

Images