JPH0312759Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a copying apparatus having an improved paper conveyance system.

<Prior art> Copying apparatuses generally have charging, exposing, developing, transferring, cleaning, and static neutralizing devices arranged opposite to a photoreceptor, which is a recording medium. It forms an image. In order to form this formed image on plain paper, a paper transport system is provided which transports the paper to the transfer position and transports the paper after the transfer out of the copying machine.

Conventionally, in the above-mentioned conveyance system, the conveyance path to the transfer position and the conveyance path from the transfer position to the outside of the copying apparatus are separate paths, and separate conveyance means such as rollers are provided for each path. Therefore, the conveyance system cannot be simplified, and it is not very promising to reduce the size and weight of the transfer device in this conveyance system.

<Purpose> The purpose of the present invention is to simplify the paper conveyance system in a copying device, thereby reducing the size and weight of the device itself.

Furthermore, the present invention aims to downsize the conveyance system by making the paper conveyance section dual-purpose.

<Embodiment> The figure is a sectional view showing an example of a copying apparatus according to the present invention. In the figure, the transfer device main body is formed into a substantially triangular shape, but this is just an example of the present invention, and the present invention is not limited to this shape. It is clear that it is included in the present invention.

In the figure, reference numeral 1 denotes a triangular exterior of the apparatus main body, and a document holding plate 2 made of a transparent glass plate is attached to one oblique side of the exterior. 3 is rotatably supported by the exterior 1 at one end, and has a document cover that covers the document support plate 2 and can be opened and closed in the direction of the arrow. An optical system 4 for optically scanning the surface of the document is provided in the exterior 1 on the lower surface of the document holding plate 2 in parallel with the holding plate 2. The optical system 4 includes an illumination device 5 consisting of a light source and a reflecting mirror for illuminating the original, a first movable mirror 6 that is integrally attached to the illumination device and reflects a reflected light image from the original, and a photoreceptor drum. a second movable mirror 7 for always keeping the optical path length constant; a mirror lens 8 for forming a light image on the photoreceptor drum; fixed mirrors 9, 10 for guiding the light image from the mirror lens to the photoreceptor drum; It consists of 11. The first movable mirror 6 is interlocked with the movement of the illumination device 5 and scanned in parallel along the document support plate 2 . Further, the second movable mirror 7 is the mirror 6
is scanned at 1/2 speed parallel to

At the bottom of the optical system 4, a photosensitive drum 12, which is exposed to light by the optical system 4 and has an electrostatic latent image formed on its surface, rotates in synchronization with the scanning speed of the first movable mirror 6. It is set up to do so. The photosensitive drum 12 has various devices for image formation around it. That is, a first corona charger 13 for uniformly charging the surface of the photoreceptor drum, a second corona charger 14 for charging and forming a latent image simultaneously with the optical image exposure by the optical system 4, and a a developing roller 15 that visualizes the image as a toner image;
Developer tank 1 for supplying toner to the developing roller
6. A transfer corona charger 17 that transfers the toner image onto the paper that is sent as appropriate; a separation roller 18 that separates the paper from the drum after transfer; and a photosensitive drum 1
A cleaning device 19 for removing toner remaining on the photosensitive drum 12 is provided facing the photosensitive drum 12 in this order.

The paper separated from the photosensitive drum 1 by the separation roller 18 is sent to the heat roller 20, where the toner is fixed. The paper on which the toner image has been fixed is guided to a conveyor belt 21 via a guide plate, and is conveyed by this conveyor belt 21. A paper ejection port 22 provided at the front of the device body
More paper is ejected. Note that the paper is supplied from a roll paper 23 provided at the bottom of the main body of the apparatus. That is,
The leading edge of the roll paper 23 is fed by a conveying roller 24 through a cutter 25 between the photosensitive drum 12 and the transfer corona charger 17. The cutter 25 is used to cut the roll paper into a required length.

On the other hand, in addition to roll paper, this embodiment is configured to allow manual paper feeding. Above the paper output port 22, there is a paper feed port 2 into which sheet paper can be input.
6 is provided, and a conveyance roller 27 is provided opposite to this paper feed port 26. Conveyance roller 2
7, the manually fed sheet is sent to the above-mentioned conveyor belt 21 via the guide plate. The conveyance belt 21 has both the function of discharging the fixed paper and the function of conveying the incoming paper to the transfer section.

That is, as shown in the figure, there is a conveyance path in which the sheet paper input by the conveyance roller 27 is conveyed to the transfer position of the transfer corona charger 17, and a paper discharge path from the transfer corona band transfer position via the fixing roller 20. Paper opening 22
A conveyance path for conveying sheet paper is provided so as to face each other. The above-mentioned conveyor belt 21, which is reversed vertically in the conveyance direction, is disposed at opposing positions on both conveyance paths. Such a conveyor belt 21
The movement of the upper surface is used for paper ejection, and the movement of the lower surface is used for conveyance to the transfer position. The sheet paper conveyed by the conveyance belt 21 via the conveyance roller 27 is conveyed to the lower surface of the conveyance roller 24 via a guide plate, and is conveyed to the transfer section in the same way as roll paper.

By configuring the paper conveyance system as described above, part of the conveyance path is shared by the same conveyance belt 21,
The transport system itself can be significantly downsized. Furthermore, since the conveyor belt is also used, the number of parts for the copying apparatus as a whole can be reduced, which helps to significantly reduce the size and weight of the apparatus.

When switching between roll paper 23 and sheet paper, it would be inconvenient to use the same conveyance roller 24. Therefore, a roller separate from the conveyance roller 24 is provided to handle the sheet-like paper conveyed from the conveyance belt 21. It is desirable to send the paper to the transfer section via a separate transport path.

In the copying machine configured as described above, the document cover 3 is opened, the document is set on the document holder plate 2,
When the document cover 3 is closed and the copy start button is pressed, various devices inside the exterior case 1 start operating and form an image. That is, the optical system 4 exposes the rotating drum 12 to a light image, and the corona chargers 13,1
In combination with the action of step 4, an electrostatic latent image is formed depending on the document. The latent image becomes a toner image via the developing roller 15, and this toner image is transferred to a transfer corona charger 17 onto a sheet of paper fed under the conveyor belt 21. The paper onto which the toner image has been transferred is transferred to the heat roller 2 via the separation roller 18.
0, the toner image is fixed by the action of the heat roller 20, and then the paper is ejected from the paper ejection port 22 using the upper surface of the conveyor belt 21 and finished as a copy.

<Effects> According to the copying apparatus of the present invention, a conveyance path for conveying paper to a transfer position to a recording medium and a conveyance path for discharging paper from the transfer position to the outside of the copying apparatus are provided opposite to each other, and this conveyance path is Since the belt conveyance means in which the paper conveyance direction is reversed is provided at opposing positions, the belt conveyance means can be used to convey the paper and discharge the paper after transfer, and the conveyance system Not only can the size be significantly reduced, but the entire copying apparatus can also be significantly reduced in size and weight.

[Brief explanation of the drawing]

The figure is a cross-sectional view showing an embodiment of a copying apparatus equipped with a paper conveyance system according to the present invention. 1: Exterior of the copying machine body, 2: Document support plate,
4: Optical system, 12: Photosensitive drum, 17: Transfer corona charger, 20: Fixing roller, 21: Paper,
Paper ejection and conveyance belt, 22: Paper ejection port, 2
6: Sheet paper feed port, 27: Conveyance roller.

Claims (1)

[Scope of utility model registration request] A copying apparatus comprising a conveyance system that conveys a sheet of paper to a transfer section for transferring an image corresponding to a document formed on a recording medium, and that discharges the sheet with the image transferred from the transfer section to the outside of the apparatus. A conveyance path for conveying paper entering the copying device toward the transfer unit and a conveyance path for conveying the transferred paper out of the copying device are provided so as to face each other, and the two conveyance paths are opposite to each other. A belt-like conveying means is arranged at a position opposite to the direction in which the sheet is conveyed in the opposite direction, and the belt-like conveying means is used both for conveying the paper to the transfer section and for conveying the paper from the transfer section to the outside of the copying apparatus. A copying device characterized by: