JPH0335261A - Picture reader - Google Patents

Abstract

PURPOSE:To prevent the occurrence of picture reading failure by displaying the scanning position of a scanning means in a display means. CONSTITUTION:The scanning position of an expose-scanning device 40 is displayed in the display device 31. As for the display device 31, the number of lit light emitting diode increases one by one from a left edge, and a consequtive state is expressed as if the expose-scanning device 40 moves. When all the light emitting diode is turned on, a resetting processing is carried out so that all the light emitting diode is turned off, and a series of the control operations of the display device 31 is completed. Thus, the movement of the expose- scanning device can be known even when an original cover is closed, and therefore, the occurrence of the picture reading failure can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an image reading device for reading an image of a document in, for example, an electronic copying machine.

(Prior Art) Conventional electronic copying machines can be broadly classified functionally into an image reading device that reads the image of a document to be copied, and an image forming device that visualizes the image information read by the image reading device. It is composed of.

Incidentally, in recent years, electronic copying machines have been configured to expose and scan the document surface by moving the exposure scanning device rather than moving the document mounting table, thereby preventing the movable parts from being exposed. , a type with a fixed document mounting table is used. In such an electronic copying machine with a fixed document tray, the document tray is provided at a fixed position on the main body of the device, and an exposure scanning device is provided below the transparent glass constituting the document tray to face the document. By moving this exposure scanning device along the document table, the surface of the document is exposed and scanned. This exposure scanning device has, for example, a light source that illuminates a document, and an optical system that includes a mirror, a lens, and the like that guides reflected light from the document illuminated by the light source onto a photoreceptor.

Copying in such an electronic copying machine is started by first placing a document on a document table, closing the document cover, and pressing a copy start key. The document cover has the function of fixing the document so that it does not move, and also has the function of blocking light from the light source of the exposure scanning device so that it does not directly enter the eyes. When the copying operation is started, the light source of the exposure scanning device is first turned on to illuminate the original on the document mounting table, and while the exposure scanning device is moved along the document mounting table, the light reflected from the original is optically illuminated. A latent image is formed on a photoreceptor by a system, and this latent image is developed and transferred to an image forming medium such as recording paper to form an image.

Conventional electronic copying machines are configured as described above, and when the image reading device reads the image, the document cover is closed, so the movement of the light source, that is, the exposure scanning device, cannot be seen, and the image is scanned before the entire surface of the document is scanned. Place the manuscript cover on the
Sometimes I ended up opening it. In such a case, there is a problem in that the position of the document is shifted, resulting in poor reading.

(Problems to be Solved by the Invention) As described above, in the present invention, since the document cover is closed when reading an image, the movement of the light source, that is, the exposure scanning device cannot be visually recognized, and the document is scanned before the entire surface of the document is scanned. This was done to solve the problem that sometimes the cover is opened, and in such a case, the position of the original is misaligned, resulting in poor image reading. It is an object of the present invention to provide an image reading device that allows the movement of the device to be known and thus prevents image reading defects from occurring.

[Structure of the Invention] (Means for Solving the Problems) An image reading device of the present invention includes: a document placing table on which a document is placed; a scanning device which exposes and scans the document placed on the document placing table; The present invention is characterized by comprising a display means for displaying the scanning state of the scanning means, and a control means for controlling the display of the display means according to the scanning position of the scanning means.

(Function) According to the present invention, when a scanning device exposes and scans a document placed on a document mounting table, the display device displays the position scanned by the scanning device. This allows the operator to recognize the movement status of the scanning means, thereby avoiding the situation where the document cover is opened before scanning is completed, thereby preventing image reading errors from occurring. .

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the external appearance of an electronic copying machine as an example of an image reading device according to the present invention, and FIG. 2 shows its internal configuration. In other words, 1 is the copying machine main body, and this copying machine main body 1
A document placement table 2 for supporting a document is provided on the upper surface of the document tray 2, and a document cover 3 is provided on the document placement table 2 so as to be openable and closable.

Further, an operation panel 21 is provided at the upper end of the copying machine main body 1.
is provided.

The operation panel 21 includes a display device 31 for displaying the scanning status on an exposure scanning device 40 (to be described later), a copy start key 32 for instructing the start of copying, a document size designation key, a paper size designation key, a magnification designation key (not shown), etc. Various operation keys are provided. The display device 31 may include, for example, 8
It is made up of several light emitting diodes arranged in a row.
Turning on and off is controlled by a control signal from a CPU (central processing unit) 50, which will be described later.

The document set on the document table 2 is scanned by an exposure scanning device 40 consisting of an exposure lamp 4 and mirrors 5, 6.7.
By reciprocating in the direction of the arrow shown in the figure along the lower surface of the document mounting table 2, exposure scanning is performed during the reciprocating movement. At this time, the scanning position of the exposure scanning device 140 is displayed on the display device '31 (details will be described later). Thereby, the operator can know the position of the exposure scanning device 40, and therefore can know whether or not scanning of the entire surface of the document has been completed.

Further, when performing exposure scanning with the exposure scanning device 40, the mirror 6.7 moves at half the speed of the exposure lamp 4 and mirror 5 so as to keep the optical path length constant. The light reflected from the original by the illumination of the exposure lamp 4 is reflected from the mirrors 5.6.
After being reflected by 7, it passes through lens 8 and is further reflected by mirror 9.
The light is reflected by the photoreceptor drum 10 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10. The photosensitive drum 10 rotates in the direction of the arrow shown in the figure, and its surface is first charged by the charger 11, and then the image of the document is exposed to slit light to form an electrostatic latent image. is visualized by applying toner by the developing device 12.

Further, below the developing device 12, a paper feeding device t13 is provided that supplies the paper P to the image transfer section 22 formed below the photosensitive drum 10. This paper feeding device 13 includes two upper and lower paper feeding cassettes 14.15 that store a plurality of sheets of paper P that can be attached and detached to the side of the main body 1, and one sheet of paper P from these paper feeding cassettes 14.15. It is composed of paper feed rollers 16 and 17 that feed the paper sheets one by one, and guide paths 18 and 19 that guide the paper P that is fed out by these paper feed rollers 16 and 17, respectively. The sheet P sent through the guide paths 18 and 19 is positioned by a pair of aligning rollers 20 that position and convey the leading edge of the sheet P, and is supplied to the image transfer section 22. Further, one of the paper feed cassettes 14 and 15 can be selected by a selection switch (not shown) on the operation panel 21.

The paper P sent to the image transfer unit 22 comes into close contact with the surface of the photosensitive drum 10 at the transfer charger 23, and thereby
The toner image on the photosensitive drum 10 is transferred by the action of the charger 23 . After the residual toner is removed from the surface of the photosensitive drum 10 after the transfer, the residual toner is removed by the cleaner 24, and then the charge is removed by the charge removal lamp 25, so that the surface returns to the initial state. On the other hand, the paper P after the transfer is electrostatically peeled off from the photosensitive drum 10 by the action of the peeling charger 26, and then conveyed to the heat roller 28 as a fixing device by the paper conveyance path 27, and passes there. By doing so, the transferred image is heated and fixed. After fixing, the paper P is discharged onto a tray 30 of the main body 1 by a paper discharge roller 29.

FIG. 3 is a block diagram schematically showing only the control circuit portion of the operation panel 21 of this image reading device. CPU
Reference numeral 50 controls the entire circuit, and is composed of, for example, a microcomputer. The CPU 50 includes a ROM (read only memory) and a RAM (random access memory), which are not shown, and are used as storage and working areas for control programs, respectively. The ROM 51 stores display data to be displayed on the display device 31.

The display data in this ROM 51 is transferred to the CPU as necessary.
50.

Further, information from various operation keys on the operation panel 21 is inputted to the CPU 50.

The register 52 temporarily holds, for example, 8-bit display data supplied from the CPU 50, and the information held in this register 52 controls the light emission of the eight light emitting diodes that make up the display bag Wt31. It is becoming more and more popular.

Next, in the above configuration, the operation of controlling light emission of the display device 31 will be explained with reference to the flowchart of FIG.

First, the operator uses the operation panel 21 to set the document size, paper size, magnification, number of copies, and other necessary information. This information is stored in a RAM inside the CPU (not shown). Next, when the operator presses the copy start key 32, a signal to that effect is transmitted to the CPU 50 (step S2).

Then, the CPU 50 reads information regarding the document size, paper size, magnification, etc. from the RAM (step S2), and reads display data from the ROM 51 (step S2).
Step S3). This display data is, for example, shown in FIG.
) is the data of pattern 1 shown in (In FIG. 5, white circles indicate lighting, and hatched circles indicate lights off. The same applies hereinafter.) Next, from the information regarding the original size, paper size, magnification, etc., the time required for exposure scanning when copying under the conditions is calculated, and this is calculated based on the number of light emitting diodes (for example, "8") that constitute the display device 31. ) to calculate a predetermined time T for creating one state in a group of eight light emitting diodes (step S4). Then, the display data read out from the ROM 51 in step S3 is sent to the register 52 (step S5). As a result, the display device 31 displays the pattern 1 shown in FIG. 5(a).
As shown in , only the leftmost one is lit and the others are off. Next, the process waits for the predetermined time T calculated in step S4 above to elapse (step S6), and when it is determined that the predetermined time T has elapsed, it is determined whether or not copying is complete (step S7). It doesn't end here p
(If it is determined, the process returns to step S3 and the same operation is performed again (
Steps S3 to S7) are repeated. In this second execution, the display device 31 displays a state in which two light emitting diodes from the left end are turned on and the others are turned off, as shown in pattern 2 in FIG. 5(a). Similarly, the number of light-emitting diodes lit up increases one by one starting from the left end, and a continuous state is expressed as if the exposure scanning device 40 were moving.

Then, when all the light emitting diodes are turned on, that is, when the exposure scan is completed, a reset process is performed to turn off all the light emitting diodes (step S8), and the series of control operations for the display device 31 is ended.

As described above, when the exposure scanning device 40 performs exposure scanning on the original placed on the document mounting table 2, the position being scanned by the exposure scanning device 40 is displayed on the display bag ft31. , the operator can recognize the scanning state of the exposure scanning device 40. Therefore, by avoiding the situation where the document cover 3 is opened before scanning is completed, it is possible to prevent image reading failure from occurring.

In the above embodiment, as shown in FIG. 5(a), the movement of the exposure scanning device 40 is represented by controlling the number of lights to be sequentially increased as a display pattern displayed on the display device 31. However, as shown in Figure 5(b),
Only one of the light emitting elements is turned on, and this is sent to the exposure scanning device 4.
It may be controlled to move sequentially according to the movement of 0. In this case, display data to be stored in the ROM 51 may be prepared in the pattern shown in FIG. 5(b).

Furthermore, by controlling the lights to be completely off for a part of the predetermined time T during which one display state is maintained, the movement of the exposure scanning device 40 can be expressed while performing a blinking display. By adopting such a configuration, there is an effect that it is possible to call even more attention to the operator.

Furthermore, in the above embodiment, a light emitting diode (LED) was used as a light emitting element of the display device 31, but a liquid crystal (LC)
D) It may be configured using other light emitting elements. Further, although the display device 31 is used to display the scanning position of the exposure scanning device 40, it may also be used for other display functions.

Further, in the above embodiment, the case where the present invention is applied to an electronic copying machine has been described, but the present invention is not limited to this, and can of course be applied to other image reading devices that read images of originals by scanning. be.

【Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an image reading device that can detect the movement of the exposure scanning device even when the document cover is closed, and can therefore prevent the occurrence of image reading defects. can.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view showing the external appearance of an electronic copying machine, Fig. 2 is a longitudinal sectional front view schematically showing the internal structure of the electronic copying machine, and Fig. 3 is an operation FIG. 4 is a block diagram schematically showing only the control circuit portion of the panel, FIG. 4 is a flowchart for explaining the operation, and FIG. 5 is an explanatory diagram for explaining the operation. DESCRIPTION OF SYMBOLS 1... Copying machine main body, 2... Original stage, 3... Original cover 4... Exposure lamp, 21... Operation panel, 31... Display device (display means), 32...・Copy start key 40...Exposure scanning device (scanning means), 50
...CPU (control means), 51...ROM, 51
・1. register. 4th pattern 200 ■○■OO■ Baku'A300000000 (a) 1 2 345678 turn 100 Q 00 Q@ ○ pattern 20
0000000 Miniature drawing

Claims (1)

[Scope of Claims] A document placing table on which a document is placed; a scanning device which exposes and scans the document placed on the document placing table; a display device which displays the scanning state of the scanning device; and a display device. An image reading device comprising: a control means for controlling display of the image according to a scanning position of the scanning means.