JPH0722925Y2 - Copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a copying machine, and particularly, after fixing a document by covering the document table with a document cover, the start key is operated to copy the document. The present invention relates to an intelligent copying machine.

(Prior Art) In a conventional intelligent type copying machine, when a start key is operated, an exposure lamp for scanning a document placed on a document table is turned on. The light emitted from the exposure lamp is reflected by the original placed on the original table. This reflected light, that is, the original image is converted into an electric signal by, for example, a CCD sensor, and temporarily stored in the memory until the scanning of the entire surface of the placed original is completed. Then, when the scanning is completed, a copy image of the placed document is formed based on the contents stored in the memory.
However, once the start key is operated, even if the document cover is opened and the placed document moves after the operation, the image forming operation by the operation of the start key is continued.

(Problems to be solved by the invention) In the conventional copying machine, when the document is moved by opening the document cover after the start key is operated, the copied image is distorted even when copying is performed. It was a miscopy, and the original had to be placed again and copied. Even if the document does not move, the light reflected from the document cover is cut off by opening the document cover, so that the margin of the copy image, that is, the part other than the part corresponding to the document in the copy image becomes black. . For this reason, if the document cover is opened halfway, the copying must be redone in any case. However, if the start key is operated, copying cannot be stopped halfway, that is, the exposure lamp cannot be turned off halfway. For this reason, one sheet of transfer paper is wasted, and toner is consumed accordingly.

Further, the operator may be dazzled and sometimes uncomfortable with the light of the exposure lamp exposed to the outside by opening the document cover.

Therefore, the main object of the present invention is to prevent the operator from feeling a glare even when the original cover is opened and scanning is incomplete, and the transfer paper is not wasted. Is to provide.

(Means for Solving Problems) Briefly, the present invention is directed to a cover opening detecting means for detecting that the document cover is opened after the start key is operated, and an output of the cover opening detecting means. In response to, the light irradiation stopping means for stopping the light irradiation operation of the light irradiation means, the storage means for storing the data corresponding to the original image read by the original reading means, and the output of the cover opening detection means. And a clearing means for clearing the data stored in the storage means.

(Operation) The document is fixed on the document table by placing the document cover on the document table and then covering the document with the document cover. After that, when the start key is operated, the light irradiating unit is operated, and, for example, the exposure lamp is turned on, and the exposure light is emitted toward the document placed on the document table. Then, the reflected light of the document, that is, the document image is read by the document reading unit. Thereafter, the read original image is converted into an electric signal by, for example, a CCD sensor or the like, if necessary, and temporarily stored in the memory. If the document image is stored in the memory, the image forming unit forms a copy image of the placed document based on the stored content.

However, when the document cover is opened after the start key is operated, that is, when the document cover is opened during the reading operation, the cover opening detection means detects that the document cover is opened. Then, in response to the output of the cover opening detection means, the light irradiation stopping means stops the light irradiation operation of the light irradiation means. If the original image data is stored in the memory, the original image data is cleared.

(Effect of the Invention) According to this invention, since the cover opening detection means, the light irradiation stopping means, the storage means, and the clearing means are provided,
By opening the document cover during the image forming operation, it is possible to prevent the operator from being dazzled or uncomfortable by the light emitted from the light emitting means, and clear the incompletely stored data. Therefore, waste of transfer paper and toner can be avoided.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the embodiments below with reference to the drawings.

(Embodiment) FIG. 2 is a structural schematic view of a copying machine according to an embodiment of the present invention. The copying machine 10 includes a main body 12. On the upper surface of this body 12,
A document table 14 made of a transparent glass plate is fixedly provided. Further, a document cover 16 for fixing a document placed on the document table 14 is provided on the upper surface of the main body 12 so as to be openable and closable. The document cover 16 is formed of, for example, a rectangular flat plate, and one side of the flat plate is openably and closably connected to the main body 12 by a hinge or the like. The surface of the document cover 16 corresponding to the document table 14 is colored in white so as to totally reflect the light of the exposure lamp described later. That is, when a small-sized original is copied onto a large sheet, if the original cover 16 is made white, the light of the exposure lamp can be totally reflected at the margin, so that the margin of the copy paper can be made white.

A fitting groove 18 is formed on the right side of the document table 14 as shown in the detailed view of FIG. A light emitting element 20a for emitting light and a light receiving element 20b for receiving the light emitted by the light emitting element 20a through the fitting groove 18 are provided on both sides of the fitting groove 18, respectively.

On the lower surface of the document cover 16, the document cover 16
A shield plate 24 is provided which is fitted into the fitting groove 18 to block the light of the light emitting element 20a when closed so as to cover 14.
Microcomputer 64 built in the main body 12 (Fig. 3)
Detects whether or not the document cover 16 is opened, depending on whether or not the light emitting element 20b receives the light of the light emitting element 20a, that is, whether or not the light of the light emitting element 20a is blocked by the shielding plate 24.

Returning to FIG. 2, below the document table 14, an exposure lamp 26 for irradiating the document placed on the document table 14 with light is provided. A reflecting mirror 28 for reflecting the light and effectively irradiating the original with the light of the exposure lamp 26 is provided on substantially the lower half of the exposure lamp 26.
Is provided. The direction of the reflected light of the original, that is, the scanning light obtained through the original table 14 is first changed by the first movable mirror 30. The exposure lamp 26, the reflecting mirror 28, and the first movable mirror 30 are integrally fixed, and can be translated from the left side to the right side or from the right side to the left side. Therefore, for example, when these are moving from the left side to the right side, the scanning light of the document placed on the document table 14 is obtained.

The scanning light whose direction is changed by the first movable mirror 30 is changed again by the second movable mirrors 32 and 34. The second movable mirrors 32 and 34 are moved in parallel from the left side to the right side or from the right side to the left side like the first movable mirror 30, but the moving speed is, for example, 1 / m of that of the first movable mirror 30.
Set to 2.

The image forming point of the scanning light whose direction is changed by the second movable mirror 34 is determined by the image forming lens 36 and is projected on the surface of the CCD sensor 38. The CCD sensor 38 converts the document image into digital data and stores it in the image memory 65 (FIG. 3) by serial transfer, for example. In the image memory,
When the storage of the data of the entire surface of the original placed on the sheet 14 is completed, the LED array 39 is driven based on the stored data.

In the LED array 39, a large number of light emitting diode elements and short-focus lenses corresponding to the light emitting diode elements are closely arranged in one row. Therefore, by selectively driving the light emitting diode elements of the LED array 39 based on the previous data, the data is reproduced in the original image. The reproduced document image is projected on the surface of the photosensitive drum 40.

A charging corotron 42 for uniformly charging the photosensitive drum 40 to a specific polarity is provided on the exposure position of the photosensitive drum 40, that is, on the upstream side of the position where the document image is projected by the LED array 39. .

A side erase lamp 44 is provided on the downstream side of the exposure position of the photosensitive drum 40. The side erase lamp 44 is
The purpose of this is to remove electric charges in the portion of the photoconductor drum 40 corresponding to the side portion of the copy paper.

A developing device is provided further downstream of the side erase lamp 44.
46 is provided. The developing device 46 includes a developing bias means for charging the toner to a polarity opposite to that of the photosensitive drum 40, and a toner supply roller for supplying the charged toner to the photosensitive drum 40.

A paper feed unit is formed on the right side of the main body 12, and a paper feed cassette 48 is detachably attached to this paper feed unit. Transfer papers of a desired size are stored in the paper feed cassette 48, and the transfer papers are fed one by one toward the photosensitive drum 40 during image formation. The fed transfer paper is detected by the paper feed sensor 49. The paper feed sensor 49 is composed of, for example, a reflection type photo sensor, and detects the transfer paper fed by reflected light.

A transfer corotron 50 and a separation corotron 52 are integrally provided on the downstream side of the developing device 46. The transfer corotron 50 transfers the toner image formed on the photosensitive drum 40 onto the transfer paper supplied from the paper feed cassette 48. The transfer paper on which the toner image is transferred is separated from the photoconductor drum 40 by the separating corotron 52.

At the peripheral portion of the photosensitive drum 40, the separating corotron 52
A cleaning device 54 is provided on the downstream side. The cleaning device 54 includes, for example, a cleaning blade, and abrades the residual toner by bringing the cleaning blade into contact with the surface of the photoconductor drum 40 from which the transfer paper has been peeled off.

A discharge lamp 56 is provided on the downstream side of the cleaning device 54. The charge removal lamp 56 irradiates light of a desired wavelength to remove residual charges on the surface of the photosensitive drum 40 that has been cleaned.

The transfer sheet separated from the photoconductor drum 40 by the separating corotron 52 is conveyed to the fixing device 60 by the conveying belt 58. The fixing device 60 includes a heating roller and a pressure roller that is in pressure contact with the heating roller. Therefore, when the transfer paper passes through the fixing device 60, the toner image is heated and pressed and is discharged onto the paper discharge tray 62 on the left side of the main body 12.

FIG. 3 is a block diagram showing an example of the control system of this invention. The control system includes a microcomputer 64
This microcomputer 64 controls the operation of the entire copying machine. Then, in the microcomputer 64,
Although not shown in detail, a CPU, a ROM connected to the CPU for storing a control program, and various flags required for temporary storage of data when the CPU controls Area and timer area for
RAM and included.

Therefore, the exposure lamp 26, the CCD sensor 38, the LED array 39, etc. shown in FIG. 2 are connected to the microcomputer 64. Then, in the microcomputer 64,
An image memory 65 for storing the data of the original image read by the CCD sensor 38 is also connected.

An operation panel 66 provided at a desired portion of the copying machine 10 is connected to the microcomputer 64. Operation panel 66
Includes a start key 68 for instructing copying of a document.

Next, with reference to FIG. 3, the operation or operation of this embodiment will be described based on the flow charts shown in FIG. 4 and FIG. Since the control relating to the normal copying operation of the copying machine is well known, the operation mainly when the document cover 16 is opened during the copying operation will be described here.

In the first step S11 in FIG. 4, it is determined whether the start key 68 has been operated. When the operation of the start key 68 is confirmed, the process proceeds to step S13.

In step S13, it is determined whether the document cover 16 is open. If the document cover 16 is open, the process proceeds to the next step S15. That is, if the document cover 16 is opened as shown in FIG. 1, the light shielding plate 24 cannot block the light of the light emitting element 20a, and therefore the light of the light emitting element 20a is received by the light receiving element 2a.
Received at 0b. Then, the output of the light receiving element 20b is given to the microcomputer 64. When the output of the light receiving element 20b is input to the microcomputer 64, the microcomputer 64 determines that the document cover 16 is open.

In step S15, the interrupt processing shown in the flowchart of FIG. 5 is prohibited.

In step S13, the document cover 16 is not open,
That is, as shown in FIG. 2, when it is determined that the original 14 is closely attached, the process proceeds to step S17. Step S
At 17, the interrupt processing shown in FIG.

Next, in step S19, the exposure lamp 26 is turned on to start reading the original. That is, the exposure lamp 26 is turned on to irradiate the document placed on the document table 14 with light, and the first lamp fixed integrally with the exposure lamp 26.
The movable mirror 30 starts moving from the left side to the right side. And
The second movable mirrors 32 and 34 also start moving from the left side to the right side at half the speed of the first movable mirror 30. The first to start moving
The scanning light of the original obtained via the movable mirror 30 and the second movable mirrors 32 and 34 of
It is incident on the CCD sensor 38.

On the other hand, when the exposure lamp 26 is turned on, the photosensitive drum 40 also starts to rotate in the direction of the arrow and the charging corotron
A bias is also applied to the developing device 42, the developing device 46, the transfer corotron 50, the separation corotron 52, and the like, so that they can be operated. In this way, in step S19, reading of the document is started and preparation for the copying operation is performed.

Even if it is determined in step S13 that the manuscript cover 16 is open, even if the process reaches step S19 via step S15, in step S19,
The reading of the document starts. This is a routine that is passed when copying a thick original such as a book. That is, when the original placed on the original table 14 is not a single sheet but a book, the original cover 16 cannot be completely closed even if the original is closed. Then, since the light shield plate 24 cannot block the light of the light emitting element 20a, the output of the light receiving element 20b is given to the microcomputer 64.
Even in such a case, the copying machine 10 executes copying with the document cover 16 open.

Next, the flow chart of the interrupt processing of FIG. 5 permitted in step S17 will be described. This interrupt process is executed in response to a signal from the microcomputer 64 when the interrupt process is permitted in step S17. That is, after confirming that the original cover 16 is closed in step S13, the copying operation is executed in response to a signal from the microcomputer 64 at regular intervals during the copying operation in step S19.

In step S21 of FIG. 5, it is determined whether the document cover 16 is opened after the copying operation is started and before the reading of the document is completed. If it is confirmed that the document cover 16 is not opened, that is, if the output of the light receiving element 20b is not given to the microcomputer 64, the process returns to the main routine, that is, step S19.

When it is confirmed in step S21 that the document cover 16 is opened, that is, when the output of the light receiving element 20b is given to the microcomputer 64, the process proceeds to step S23.

In step S23, the exposure lamp 26 is turned off after the reading of the original document is started in step S19. When the exposure lamp 26 is turned off, the light of the exposure lamp 26 exposed by the operator by opening the original cover 16 is also extinguished. That is, at the same time when the document cover 16 is opened, the exposure lamp
Since 26 is turned off, the light of the exposure lamp 26 does not dazzle or make the operator feel uncomfortable.

Next, in step S25, the exposure lamp 26, the first movable mirror 30 and the second movable mirrors 32, 34 that are integrally fixed are provided.
Is returned to the left home position.

In the next step S27, the data in the image memory 65 is cleared. That is, if the document cover 16 is opened after the document reading is started in step S19 and before the document reading is completed, the reflected light of the document cover 16 disappears when the document cover 16 is opened. That is, the margin portion of the transfer paper is black and is stored in the data image memory 65. In this case, even if some of the originals have been read, the copied image formed on the transfer paper is a miscopy even if an image is formed with the data. Therefore, when the document cover 16 is opened midway, the data stored in the image memory 65 must be cleared and the document must be read again.

In step S19 described above, the reading operation of the document is started, and the photoconductor drum 40 and the like start rotating to prepare for the copying operation. However, in step S27 of the interrupt process, the image data is cleared. Then, the preparation for the copying operation is terminated. Therefore, when the document cover 16 is opened while the document is being read and the reading of the document is incomplete, the preparation for copying is aborted, and the scanning light of the document is projected directly onto the photosensitive drum. Transfer paper and toner are not wasted as in a copying machine that performs copying.

[Brief description of drawings]

FIG. 1 is an enlarged view of a document table and a document cover according to an embodiment of the present invention. FIG. 2 is a structural schematic view of a copying machine according to an embodiment of the present invention. FIG. 3 is a block diagram showing an example of the control system of this embodiment. FIG. 4 is a flow chart for explaining the operation of this embodiment. FIG. 5 is a flow chart for explaining the interrupt routine of this embodiment. In the figure, 14 is a document table, 16 is a document cover, 20a is a light emitting element, 20b is a light receiving element, 24 is a shield plate, 26 is an exposure lamp, and 3
6 is an imaging lens, 38 is a CCD sensor, 39 is an LED array, 40 is a photosensitive drum, 64 is a microcomputer, and 68 is a start key.

Claims (1)

[Scope of utility model registration request] 1. A document table on which a document is placed, a document cover for fixing the document placed on the document table and placed thereon, a start key for designating copy of the document, and Light irradiation means for irradiating the original placed on the original table with exposure light in response to operation of a start key; original reading means for reading the original based on reflected light of the original; In a copying machine including an image forming unit for forming a copy image based on a document image read by a document reading unit, a cover for detecting that the document cover is opened after the start key is operated. Opening detection means, light irradiation stopping means for stopping the light irradiation operation of the light irradiation means in response to the output of the cover opening detection means, and a document image read by the document reading means. Copying comprising storage means for storing the same data and clear means for clearing the data stored in the storage means in response to the output of the cover opening detection means. Machine.