JPS63301057A - electronic photo printer - Google Patents

Abstract

PURPOSE:To constitute a simple, small-sized, and lightweight structure as a front lid coupling part for a main body and easily open and close a front lid, and to easily handle paper jamming by providing a photosensitive drum, an exposing means, and a developing means which are heavy bodies on the main body side and also providing a transfer device and a paper guide which are lightweight bodies inside the front lid. CONSTITUTION:A toner image is formed on the surface of the photosensitive drum 5 through the electrostatic charging, exposure, and development of an electrostatic charger 6, an exposure source 7, and a developing device 8 provided to the main body 1. The developing device 8 is positioned right above the photosensitive drum 5 and its toner cartridge 9 can be attached from the upper side by opening a paper feed cover 11 fitted to the front part of the top surface of the main body 1 in an openable state. Then if a paper jam occurs on a transfer paper passage, the front lid 21 is opened to open the front of the transfer paper path, so transfer paper which jams is easily removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic printer, and more particularly to countermeasures against paper jams in small electrophotographic printers.

[Conventional technology]

The conventional small electrophotographic printer was published in Japanese Patent Application Laid-Open No. 60-635.
As described in Publication No. 49, the main body is made of a clamshell L4 structure in which the main body is divided into an upper housing and an F part housing, and the upper housing that opens and closes has a photosensitive drum, a charger, an exposure means, a developing device,
It is equipped with a cleaner and an upper roller of a registration roller, and a lower housing is equipped with a paper feed cassette, a roller on the 17th side of the registration roller, a transfer device, a guide, a fixing device, and a paper ejection tray.

[Problem to be Solved by the Invention J] In such conventional electrophotographic printers, when a jam occurs, the upper housing is opened and the jammed transfer paper is removed.
As mentioned above, the upper casing is a heavy object that is equipped with a large number of electrophotographic process means, so it requires a large operating force, and the upper and lower rollers of the Regis I. The upper and lower casings require high coupling accuracy because they are separated into two parts, and therefore the opening/closing joint between the upper and lower casings must have a structure that allows for accurate coupling of heavy objects. Therefore, there was a problem that strong rigidity was required and the size was increased.

Therefore, an object of the present invention is to provide a compact and easy-to-use paper jam countermeasure.
Our goal is to provide a lightweight electrophotographic blinker.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention uses a charging method.

A transfer paper is brought into contact with the surface of the photosensitive drum on which a toner image has been formed by exposure and development, and a transfer charge is applied to the back side of the transfer paper by a transfer device to transfer the toner image to the transfer paper, and the toner image is transferred from the photosensitive drum. In an electrophotographic printer in which the separated transfer paper is guided to a fixing device by a paper guide, the photosensitive drum and charging, exposing, and developing means are provided in the main body, and the transfer paper is placed between the front side and the bottom of the photosensitive drum. The transfer paper is conveyed downward from the t direction so as to be in contact with the photosensitive drum, and is located inside the openable front cover and on the back side of the transfer paper that contacts the photosensitive drum when the front cover is closed. The paper guide is provided so as to be inclined so as to contact the transfer device and the back side of the transfer paper to which the toner image has been transferred and to guide the transfer paper while receiving the weight of the transfer paper. shall be.

[For production]

The photosensitive drum, exposure means, and developing means, which are heavy objects, are supported by the main body, which is stationary, and the transfer device and paper guide, which are light objects, are supported by the front cover, which is the movable side. The acting weight is light, and the core part only needs to be of a small and lightweight structure.
The nucleus becomes smaller. In addition, the transfer paper comes into contact with the photosensitive drum between the front side and the bottom of the photosensitive drum, the toner image is transferred, and the paper moves down on the paper guide, so the jammed transfer paper can be removed by opening the front cover. .

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is an external perspective view of the electrophotographic printer according to the present invention. The printer supplies transfer paper 3 into the main body from a paper feed tray 2 detachably provided on the top surface of the main body 1.
A toner image obtained by charging, exposing, and developing a photosensitive drum provided inside is transferred to a transfer paper 3, then fixed, and the paper is ejected onto a paper ejection tray 4 that is detachably provided on the front surface of the transfer paper 3. .

FIG. 1 is a longitudinal sectional side view of this printer.

The photosensitive drum 5 is provided in the main body 1, which is a stationary side, and is driven to rotate in the direction of the arrow. The surface of the photosensitive drum 5 is charged with a charger 6 provided in the main body 1. Exposure source7. A toner image is formed by charging, exposure, and development by the developing device 8. The developing device 8 is located directly above the photosensitive drum 5, and the toner cartridge 9 is mounted on a hinge 1 at the front of the upper surface of the main body 1.
By opening the paper feed cover 11, which is rotatably attached to the paper feed cover 11, the paper feed cover 11 can be attached and detached from above. Note that IIA is a cartridge cover that holds the toner cartridge 9, and 11B is a fixing latch that locks the paper feed cover 11 when it is closed.

A paper feed separation mechanism 13 is provided on the paper feed cover 11, and extracts the transfer paper 3 one by one from the paper feed tray 2, which is detachably attached to the paper feed cover 11, and feeds the transfer paper 3 to the single nozzle roller 15 via a paper guide I4. Paper guide 14 and registration roller 15
are provided in the main body 1, and the registration rollers 15 feed the transfer paper 3 toward the transfer position of the photosensitive drum 5 via the paper guide 16 at the timing when the transfer paper 3 is aligned with the toner image formed on the photosensitive drum 5.

The transfer paper 3 sent out from the registration rollers 15 and guided down by the paper guide 16 is conveyed at an angle so as to come into contact with the surface of the photosensitive drum 5 at a transfer position between the front side and directly below the photosensitive drum 5. Ru. The transfer device 17 transfers the toner image by applying a transfer charge to the back surface of the transfer paper 3 at a transfer position where the transfer paper 3 contacts the photosensitive drum 5 . The inclined paper guide 18 comes into contact with the back side of the transfer paper 3 on which the toner image has been transferred, is separated from the surface of the photosensitive drum 5, and descends.
Since the transfer paper 3 is slidably guided and fed to the fixing device 19 while receiving the weight of the transfer paper 3, the movement of the transfer paper 3 becomes stable. paper guide 20
a and 20b discharge the transfer paper 3 from the fixing device 19 face down onto the paper discharge tray 4 through a paper discharge port 21a formed at the lower part of the front lid 21.

Paper guide 16. The transfer device 171 paper guide 18 and paper guide 20a are attached to the inside of the front M21, and the lower end of the front M21 is attached to the main body 1 by a pin hinge 22 so that it can be freely rotated. The transfer paper conveyance path is opened. Note that the fixing device 19 and paper guide 20b are attached to the main body 1.

The eraser 23 erases the electrostatic latent image remaining on the surface of the photosensitive drum 5, and the cleaner 24 removes the toner image remaining on the surface of the photosensitive drum 5.

The radiation guard 25 reduces the transmission of radiant heat from the fixing device 19 to the photosensitive drum 5 and the cleaner 24.

The power supply 26 and the control circuit board 27 are provided separately from the photosensitive drum 5 and the cleaner 24, and are forcibly cooled by exhaust air from the cooling fan 28. The cooling fan 28 connects the fuser 1 from the intake port 28a.
9 and the cleaner 24 to absorb the heat from the core, and exhaust air from the exhaust duct 29 is discharged outside the machine from the exhaust port 1a on the rear surface of the main body through the power supply 26 and the control circuit board 27. Forced cooling. Further, the ventilation for cooling by the cooling fan 28 also sucks in ozone generated from the charger 6 and the transfer device 17 and discharges it to the outside of the machine.

In the electrophotographic printer of this embodiment configured as described above, paper is fed from the paper feed tray 2 above the main body, transferred and fixed onto the descending transfer paper 3, and then transferred onto the paper output tray 4 at the front of the main body. Since the paper is ejected face-down, it can be used in a smaller space compared to one in which the transfer paper path is horizontal.

When a jam occurs in the transfer paper path,
Since the front side of the transfer paper path is opened by opening the transfer paper 1, the jammed transfer paper 3 can be easily removed. Moreover, the front 1121 has a lightweight paper guide 16.1.
8. Since only the 208 and the transfer device 17 are provided, it can be opened and closed easily, and since these do not require high positioning accuracy, the pin hinge 22 that attaches the front cover 21 to the main body l is also used. A simple, small, and low-strength structure will suffice.

Furthermore, when the front cover 21 is opened, the front side of the photosensitive drum 5 is also opened, so if the mounting/detaching direction of the photosensitive drum 5 is configured to face forward, the mounting/detaching (replacement) of the photosensitive drum 5 can also be done by removing the paper jam. It can be done with the same ease.

Furthermore, the toner cartridge 9 of the developing device 8 can be easily attached/detached (replaced) from above by rotating the paper feed cover 11 to open the upper part of the developing device 8.

Furthermore, since the paper feed tray 2 and the paper discharge tray 4 are removable from the main body 1, the packaging size during transportation can be reduced by removing them.

〔Effect of the invention〕

As described above, in the present invention, the photosensitive drum, exposing means, and developing means, which are heavy objects, are provided on the main body side, and the transfer device and paper guide, which are lightweight objects, are provided inside the front cover which can be opened and closed. Therefore, the front lid connecting portion to the main body has a simple, small and lightweight structure, and the front lid can be easily opened and closed to easily prevent jamming.

[Brief explanation of drawings]

The drawings show an electrophotographic printer according to the present invention, and FIG. 1 is an external perspective view, and FIG. 2 is a longitudinal side view. l... Main body 5... Photosensitive drum, 6... Charger,
7... Exposure source, 8... Developing device, 17... Transfer device,
18... Paper guide, 19... Fixing device, 21... Front lid. l$ IB Figure 2

Claims (1)

[Claims] 1. A transfer paper is brought into contact with the surface of a photosensitive drum on which a toner image has been formed by charging, exposure, and development, and a transfer charge is applied to the back side of the transfer paper by a transfer device to form a toner image. In an electrophotographic printer in which a toner image is transferred to a transfer paper and the transfer paper separated from the photosensitive drum is guided to a fixing device by a paper guide, the photosensitive drum and charging, exposing, and developing means are included in the main body. The transfer paper is conveyed from above to below so as to be in contact with the front side of the photosensitive drum between the front side and the bottom thereof. The transfer device is positioned on the back side of the transfer paper that contacts the photosensitive drum, and the transfer device contacts the back side of the transfer paper on which the toner image has been transferred and is separated from the photosensitive drum and guides the transfer paper while receiving the weight of the transfer paper. An electrophotographic printer characterized in that the paper guide is provided at an angle such that the paper guide is tilted so as to 2. The electrophotographic printer according to claim 1, wherein the front cover is provided so that it can be rotated and opened with respect to the main body.