JPS60181758A - Copying apparatus - Google Patents

Abstract

PURPOSE:To render a copying apparatus compact by exposing an original while it is moved on a forward course, and automatically executing backward movement after the end of the forward step to return it in an original insertion stand. CONSTITUTION:A photosensitive drum 14 rotates anticlockwise in the direction of arrow C, uniform electrostatic charging is given on its surface with a charger 1, an original image is projected with a converging light transmission array 37 to form an electrostatic latent image, and it is developed with a developing device 16 also serving as a cleaner. A transfer paper placed in a paper feed cassette 28 is taken out one by one with a paper feed roll 29, conveyed through a paper feed guide 30 to a register roll 31, and timing is accorded there with the visualized toner image on the drum 14. The paper is refed, passed through a conveying guide 32, and brought to a transfer region. The toner image on the drum 14 is transferred to the paper with a transfer device 20, the paper is separated from the drum 14 with a separating piece 25, and sent to a fixing device 21 with a conveying roll 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a copying apparatus, and particularly to a document feed type copying apparatus.

(Prior art and its problems) There have traditionally been three types of typical document table configurations for electrophotographic copying machines: (1) one in which the document table is fixed and the optical system moves; (2) One has a fixed optical system and a moving document table, and the other is one that feeds the original itself.From the point of view of cost and complexity of the structure, the one that feeds the original is the best.Especially one that feeds the original document.
Although it has the disadvantage that it can only copy originals in sheet form, copying machines used for office processing etc. often use originals in sheet form. This is a method that has sufficient merits when taken into consideration.

FIG. 1 shows a typical example of an original feed type electrophotographic copying machine. The original is inserted onto the original table 4 with the image surface facing downward, and is sent in the direction of arrow A by the action of the original feeding section 2. At this time, the optical image of the original is projected onto the surface of the photoreceptor 1, which has been uniformly charged by the charger 6, by the converging light transmitter array 3, and an electrostatic latent image is formed on the surface of the photoreceptor 1. It is formed. Thereafter, the original is conveyed in the direction of arrow B and discharged onto the original tray 5. On the other hand, the electrostatic latent image on the photoreceptor 1 is visualized by a developing device 7, and further transferred onto a transfer paper by a transfer roll 8.

The transfer paper is stored in a paper feed cassette 9, and is fed to the transfer roll 8 by the rotation of the paper feed roller 10.

Thereafter, the transfer paper passes through a fixing device 11, where the developed image is fixed, and is discharged onto a transfer paper tray 12. The cleaning device 13 collects toner remaining on the photoreceptor 1 and prepares the photoreceptor 1 for the next copying cycle.

However, in the above-mentioned copying machine, the parts other than the document table are almost the same as those of conventional copying machines that adopt a fixed document table in (①) or a movable document table in (②), and the merits of the document feed method are not fully utilized. It has not been. In other words, the machine is too large to be a copying machine using the document feed method, and it is also expensive.

[Purpose of the invention]

In view of the above-mentioned conventional drawbacks, the present invention has been developed to significantly reduce the size and size of the device.
The purpose of the present invention is to provide a copying device that can be manufactured at a low price.

[Key points of the invention]

In order to achieve the above-mentioned object, the present invention forms an outgoing path for document conveyance by an upper conveyance roller and a middle conveyance roller that rotates in contact with the upper conveyance roller, and a lower part that rotates in contact with the middle conveyance roller and the middle Ill conveyance roller. A return path for document IM feeding is formed by a transport roller, and exposure is performed while the document is moving on the forward path, and after the end of the forward path step, the return path step is automatically carried out so that the document returns to the document insertion table. An object of the present invention is to provide a copying apparatus characterized by the following configuration.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram of a copying apparatus showing an embodiment of the present invention.

The photoreceptor 14 is rotatably provided in the direction of arrow C, and a charging device 15 . Developing and cleaning device 16. A transfer device 20 is provided, and a fixing device 21 is further provided above the photoreceptor 14. The developing/cleaning device 16 has a Macnet roll 17 inside the container. Stirring roll 18. It has an auxiliary roller Ii and a roll 19, and is configured to perform development and cleaning in the same device. The fixing device 2I also includes a heat roll 23 having a heater 22 therein, and a bank up roll 2 that is in pressure contact with the heat roll 23.
It consists of 4.

A document conveyance path is provided in the lower part of the main body of the apparatus, and includes feed rolls a40 and b41 provided at a predetermined distance, and intermediate rolls a42 and 42 provided so as to rotate in contact with these rolls. An outgoing path for conveying the document is formed by the intermediate roll b43, and further by the intermediate roll a42. An intermediate roll b43, and a discharge roll a44 provided to rotate in contact with the intermediate roll b43. A return path for conveying the document is formed by the discharge roll b45. A slit is formed by the exposure glass 46 and the document presser 47 on the outgoing path for general feeding of the document 1 formed here, and the document is fed into this slit.

The original image exposure section provided below the photoconductor 14 uses an exposure lamp 35 surrounded by a lamp cover 36 having an opening toward the exposure surface, and directs light reflected from the exposure surface to the photoconductor 14. It is composed of a focusing light transmitting array (hereinafter referred to as SLA) 37 that projects upward, and a dustproof glass 38.

In addition, there is a paper feed cassette 2 that stores transfer paper at the top of the main body of the device.
8 are arranged and are sequentially fed out one by one by a paper feed roller 29.

Next, the operation of the copying apparatus configured as above will be explained. First, a sheet-shaped original is placed on the original tray 39 with its image side facing up. The original is on feed roll A40
The rotation of the intermediate roll a42 in the direction shown in the figure guides it into the apparatus main body in the direction of arrow E. Furthermore, if the original is exposed, the exposure glass 4
6 and the document presser 47.

At this position, the original is exposed to light. The original is irradiated by an exposure lamp 35, and a light image thereof is formed on the surface of the photoreceptor 14 by a 5LA 37.

The original that has passed through the slit is then sent to the feed roll b41.
By rotating the intermediate roll b43 in the direction shown in the figure, the document is guided into the space between the document upper guide 49 and the document lower guide 50. Initially, the document moves in the direction of arrow F, but the rear end of the document is on feed roll b4.
1 and the intermediate roll b43, and when released from the feeding action, it heads in the direction of arrow G due to its own weight, and is then held between the intermediate roll b43 and the discharge roll b45, and the discharge guide 48 is rotated in the direction shown in the figure. sent to the top. Furthermore, the document is transferred to intermediate roll a42 and discharge roll a.
Due to the rotational action of 44, the document 1 is returned onto the sheet 39 through the path indicated by the arrow 1-I.

By the way, the photoreceptor 14 is rotating counterclockwise as shown in the direction C, and its surface is first uniformly charged by the charging device 15, and then an original image is irradiated by the 5LA 37 as described above. to form an electrostatic latent image. This electrostatic latent image is visualized by the next developing/cleaning device 16. On the other hand, the transfer paper stored in the paper feed canister 28 is fed out one by one by a paper feed roller 29, passes through a paper feed guide 30, and is moved by a registration roll 31 to adjust the timing with respect to the developed image on the photoreceptor 14. Illllll will be re-fed at the same time.
It passes through the guide 32 and is sent to the transfer area. Here, the developed image on the photoconductor 14 is transferred onto the transfer paper by the transfer device 20, and then the transfer paper is separated from the photoconductor weight 4 by the separation piece 25 and sent to the fixing device 21 by the single shark feeding roller 2G. And He Roll 23 and Hack Up Roll 24
The image is fixed on the transfer paper by the heating and pressure action of
Furthermore, this transfer paper passes through a discharge guide 27 and then passes through a discharge roll 3.
3 onto the transfer paper tray 34. Also, after transcription,
The photoreceptor 14 further rotates, and the developing/cleaning device 1
At step 6, residual toner on the photoreceptor 14 is cleaned. Note that if the document presser 47 is a white plate and prior to cleaning the photoreceptor 14 during the second rotation, the entire surface of the photoreceptor 14 is irradiated with white light from the exposure lamp 35 to bring the charge on the surface to almost zero potential, then cleaning can be performed. done more effectively. Furthermore, when the document is fed (moved in the E and F directions), the image forming process of the first rotation of the photoreceptor 14 is performed, and when the document is ejected (moved in the G and 11 directions), the photoreceptor 14 is Efficient copying work can be achieved by setting the rotating eye cleaning process to be performed.

Further, if the maximum copy document is A4 size, for example, in the copying apparatus of this embodiment, the direct t'A D of the photoreceptor 14 is about 70 mm, the width W of the 6 main bodies is about 200 mm, and the height is about 280 mm. This results in significant downsizing.

Further, since the fixing device 21 is arranged above the photoreceptor 14, the problem of deterioration of the photoreceptor 14 due to heat is alleviated.

〔Effect of the invention〕

As described above in detail, the copying apparatus of the present invention can be made significantly more compact and lower in price, and has very good operability, which has great effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional document feed type copying apparatus, and FIG. 2 is a block diagram of a copying apparatus showing an embodiment of the present invention. 1.14...Photoreceptor, 15...Charging device, 16
...Development and cleaning device, 20...Transfer device,
21... Fixing device, 28... Paper feeding power cent, 3
5... Exposure lamp, 37... Focusing light transmitter array (SLA), 39... Original f-height tray, 40...
...Feed roll a, 41...Feed roll b1 42
...Intermediate roll a143...Intermediate roll b, 44
...Discharge roll a1 45...Discharge roll b146
...Exposure glass, 47...Document holder, ,49.
...Manuscript top guide, 5゜...Document bottom guide. Patent Applicant: Casio Computer Co., Ltd. Yoshiyuki Osuga, Patent Attorney, ID Co., Ltd.

Claims (2)

[Claims] (1) An upper transport roller and a middle transport roller that rotates in contact with the upper transport roller form an outward path for transporting the document, and the middle transport roller and a lower transport roller that rotates in contact with the middle transport roller form the document lul! The apparatus is characterized in that a return path is formed for feeding, exposure is performed while the document is traveling on the forward path, and after the completion of the forward path step, the step of the return path is automatically performed and the document is returned to the document insertion table. A copying device that uses (2) The copying apparatus according to claim 1, wherein image formation is performed during the forward path process, and cleaning is performed during the return path process.