JPH0867355A - Electrophotographic recorder - Google Patents

Abstract

PURPOSE: To provide such an electrophotographic recorder as being capable of smoothly putting paper sheets in and out and effectively restraining the curling of the sheets when printed. CONSTITUTION: A photosensitive drum 1 to apply recording information as electrostatic latent images on the outer face, a developing means 2 to develop the latent images applied to the photosensitive drum 1, a transfer means (transfer roller) 3 to transfer the developed information on the photosensitive drum 1 to fed paper sheets and a fixing means (fixing roller) to fix the transferred information are mounted in a recorder mainframe 20. An upper cover 10 for the printer mainframe 20 is mounted on the printer mainframe 20 in a freely open/closed manner. The upper cover 10 has a sheet storage room 11 to store a certain number of paper sheets in layers. A sheet feeding roller 12 is furnished downward of one end of the sheet storage room 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic recording apparatus, and more particularly, to an electrophotographic recording apparatus using a sheet cassette.

[0002]

2. Description of the Related Art In a conventional electrophotographic recording apparatus in which printing paper is fed by a cassette, a paper feeding cassette is usually installed at a lower portion of the apparatus. FIG. 3 is a cross-sectional view of a conventional electrophotographic recording apparatus using a lower cassette.

[0003] In the conventional example shown in FIG. 3, printing paper P set in a paper feeding cassette 51 is picked up by a pick roller 52.
The sheet is picked up by the sheet feeding roller 53 and is then conveyed by the sheet feeding roller 53, and reaches the photosensitive drum 55 and the transfer roller 56. Here, the toner on the photosensitive drum 55 is transferred onto the paper by the transfer roller 56. The toner transferred to the sheet is fixed by the fixing roller 57. After that, the paper is carried by the first paper feed roller 58 and the second paper feed roller 59 and discharged onto the upper surface of the apparatus.

[0004]

However, in the above-mentioned conventional example, a space for pulling out the cassette is required for loading and unloading the sheet, and when the printing sheet is discharged onto the upper surface of the apparatus, the sheet is fixed. Since the R of the paper discharge path from the exit of the roller 57 portion to the stacking on the upper surface of the apparatus is small, there is a problem that the printed paper has a curl-like curl.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic method capable of improving the disadvantages of the prior art, and in particular, enabling smooth insertion and removal of paper and effectively suppressing the occurrence of curl in printed paper. It is an object to provide a recording device.

[0006]

According to the present invention, in the main body of the apparatus, a photosensitive drum on which information for recording is attached as an electrostatic latent image on the outer surface, and an electrostatic latent image attached on the photosensitive drum. Is equipped with a developing means for developing, a transfer means for transferring the developed information on the photosensitive drum to the fed paper, and a fixing means for fixing the transferred information, and at the top of the apparatus main body, An upper lid portion for the main body of the apparatus is provided so as to be openable and closable.

The upper lid portion has a sheet storage chamber for storing a predetermined amount of sheets in layers, and a paper feed roller is provided below one end of the sheet storage chamber. This aims to achieve the above-mentioned object.

[0008]

[Operation] In the printing process of the paper P, the paper P is first picked by the paper feed roller (pick roller) 12 and then carried by the paper feed roller 5, and the photosensitive drum 1 and the transfer roller 3
Reach Here, the toner on the photosensitive drum 1 is transferred onto the paper P by the transfer roller 3. The toner transferred to the paper P is fixed by the fixing roller 4. After that, the paper is carried by the paper feed rollers 6 and 7, and the upper surface of the apparatus (opening / closing lid 10
It is discharged to the upper surface of A).

Since the paper storage chamber (paper feed cassette portion) 11 is installed above the apparatus main body 20, the distance between the paper feed rollers 6 and 7 becomes long, and therefore the paper feed rollers 6 and 7.
The R between 7 (R of the paper discharge path) is also set to a large value, so that the paper curl can be surely reduced by that amount. Further, since the whole of the upper lid portion 10 is constructed so as to rotate up and down and can be opened and closed, maintenance and inspection of the photoconductor drum 1, the transfer roller 3, the fixing roller 4, and the developing means 2 can be facilitated. Can be quickly responded to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the embodiment shown in FIGS. 1 and 2, a photosensitive drum 1 having recording information as an electrostatic latent image on its outer surface is provided in a main body 20, and the photosensitive drum 1 is provided with the photosensitive drum 1. Developing means 2 for developing an electrostatic latent image, a transfer roller 3 as a transfer means for transferring the developed information on the photosensitive drum 1 to a fed sheet, and a fixing means for fixing the transferred information. And a fixing roller 4 as An upper lid 10 for the apparatus body 20 is openably and closably mounted on the upper portion of the apparatus body 20.

The upper lid 10 has a sheet storage chamber 11 for storing a predetermined amount of sheets P in layers, and a paper feed roller 12 is provided below one end of the sheet storage chamber 11.

Further, the apparatus main body 20 is equipped with the above-described sheet carry-in guide 13 from the sheet feed roller 12 to the transfer means 3, and the sheet P fixed by the fixing roller 4 is placed on the upper surface of the upper lid portion 10. A paper carry-out guide 14 for sending out is provided.

The upper lid portion 10 has a photosensitive drum 1 described above.
An optical system 15 for forming an electrostatic latent image is provided on the top.
Reference numeral 5 denotes a paper feed roller on the paper carry-in side, and reference numerals 6 and 7 denote paper feed rollers on the paper carry-out side, respectively. Further, the upper lid 10 is provided with an opening / closing lid 10A that can be opened and closed freely on the upper surface of the paper storage chamber 11.

In the process of printing the paper P, the paper P is first picked by the paper feed roller (pick roller) 12, then carried by the paper feed roller 5, and reaches the photosensitive drum 1 and the transfer roller 3. Here, the toner on the photosensitive drum 1 is transferred onto the paper P by the transfer roller 3. The toner transferred to the paper P is fixed by the fixing roller 4. Thereafter, the paper P is carried by the paper feed rollers 6 and 7, and is discharged to the upper surface of the apparatus (the upper surface of the opening / closing lid 10A).

For this reason, in the above embodiment, the opening / closing lid 10A and the paper storage chamber (paper feed cassette section) 11 can be integrated, and the paper storage chamber (paper feed cassette section) 11 Since the paper feed rollers 6 and 7 are disposed at the upper portion, the distance between the paper feed rollers 6 and 7 is increased, so that R between the paper feed rollers 6 and 7 (R of the paper discharge path) can be set large. Has the advantage of being able to be surely reduced. Further, as shown in FIG. 1, opening / closing of the opening / closing lid 10A makes it possible to quickly and easily carry out a paper loading / unloading operation, and as shown in FIG. Therefore, the photosensitive drum 1, the transfer roller 3, the fixing roller 4,
In addition, there is an advantage that maintenance and inspection of the developing means 2 can be easily performed, and that the apparatus can be promptly dealt with.

[0017]

The present invention is constructed and functions as described above. According to this, the upper cover (opening / closing lid on the upper surface) is provided.
And the paper cassette are integrated, reducing the space required to pull out the paper cassette during paper loading and unloading work. Since the distance of the paper discharge path from when the paper exits to the upper surface of the apparatus can be long, the radius of the curved path of the paper discharge path can be set to be large, so that the paper curl can be surely reduced by that much. The present invention can provide an excellent electrophotographic recording apparatus that has never been achieved before.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of FIG. 1 (cover open state).

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Photoreceptor Drum (OPC Drum) 2 Developing Means (EP Cartridge) 3 Transfer Means (Transfer Roller) 4 Fixing Means (Fixing Roller) 10 Upper Lid 11 Paper Storage Chamber 12 Paper Feed Roller 13 Paper Carry-in Guide 14 Paper Carry-out Guide 15 Optical system

Claims (3)

[Claims] 1. A photoconductor drum on the outer surface of which recording information is provided as an electrostatic latent image, a developing means for developing the electrostatic latent image provided on the photoconductor drum, and Equipped with a transfer means for transferring the developed information on the photosensitive drum to the fed paper, and a fixing means for fixing the transferred information, and an upper lid part for the apparatus body at the upper part of the apparatus body. In the electrophotographic recording apparatus equipped with a freely openable and closable device, the upper lid portion has a sheet storage chamber for storing a predetermined amount of sheets in layers, and a paper feed roller is provided below one end of the sheet storage chamber. An electrophotographic recording device characterized in that 2. The electrophotographic recording apparatus according to claim 1, wherein a sheet carry-in guide from the sheet feed roller to the transfer unit is provided in the apparatus main body, and a sheet fixed by the fixing unit. An electrophotographic recording apparatus, characterized in that a paper carry-out guide for sending the paper to the upper surface of the upper lid is provided. 3. The electrophotographic recording apparatus according to claim 1, wherein the upper lid is equipped with an optical system for forming an electrostatic latent image on the photosensitive drum.