JPH01575A - image recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image recording apparatus that performs optical writing on a photoreceptor drum via an optical writing device with a light beam corresponding to one image information signal.

With image recording devices such as laser printers and facsimiles,
A laser beam whose emission is controlled or modulated in accordance with an image information signal is used to write light on the photoconductor through an optical writing unit, and the electrostatic latent image formed on the photoconductor is developed by a development unit. The toner image is transferred to transfer paper fed from an automatic paper feeding unit under the action of a transfer charger, and is fixed and recorded.

By the way, in a conventional recording device of this type, an optical writing unit is provided above the photoconductor, and optical writing is performed at a position above the photoconductor, and after being developed into a toner image, the optical writing unit is placed on the photoconductor. Normally, the image is transferred onto a transfer sheet that is fed with the transfer surface facing upward to a transfer section between the transfer charger and the transfer charger provided in contact with the lower side.

Therefore, the paper feed section may protrude to the side of the developing unit, or
When the transfer charger is installed below the transfer charger, it is installed with enough space to allow the transfer paper to make a U-turn without difficulty, resulting in an overall increase in the size of the device. Also, if the transfer paper jams in the transfer section or paper feed path,
In order to remove the jammed paper, it is necessary to open the entire photosensitive drum unit including the writing optical unit, the developing unit, and the photosensitive member, which has the drawback of poor operability.

The present invention eliminates the above-mentioned drawbacks of the conventional image recording apparatus having the above-mentioned structure. An object of the present invention is to provide an image recording device that can achieve miniaturization of the device and improved operability when handling jammed paper.

In order to achieve the above object, the present invention disposes an optical writing unit below a photoconductor drum and a developing unit, and further disposes a transfer section above the photoconductor drum, so that the image surface of the transfer paper is It is characterized in that the paper is fed downward to the transfer section by a pair of registration rollers.

Furthermore, by making a part of the upper cover of the apparatus body openable and closable, and by providing a transfer charger and a pair of registration rollers or an upper roller integrally with a part of the upper cover, it is possible to easily dispose of jammed paper. It becomes like this.

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

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to a laser printer.

On the circumferential surface of the photoreceptor drum 1, chargers 2. developing unit 3, transfer charger 4,
A cleaning unit 5 is arranged, and a writing optical unit 7 is provided so that a writing beam enters and exposes the photosensitive drum 1 at a position 6 between the charger 2 and the developing unit 3.

In the device of this embodiment, a charger 2. The optical writing position 6 is arranged below the photoreceptor drum 1, and the optical writing unit 7 is provided below the photoreceptor drum 1, the developing unit 3, and the cleaning unit 5.

Further, the transfer charger 4 is arranged above the photosensitive drum 1. A paper feed cassette 8 that feeds transfer paper to a transfer section between the transfer charger 4 and the photosensitive drum 1 is provided further below the optical writing unit 7, and the transfer paper is fed by a feed roller 9 and a friction member that presses against the feed roller 9. The double feed is separated by the bat 10 and the sheets are sent out one by one, making a large U-turn on the side of the developing unit 3, and then being transferred to the photosensitive drum 1 by a pair of registration rollers 11 and 12 provided above the developing unit 3.
The paper is fed to the transfer section at the same timing as the image formed above. A fixing unit 13 is provided on the transfer paper path after transfer, and a paper discharge tray 14 is provided on the discharge side thereof.

As shown in FIGS. 1 to 3, the writing optical unit 7 is configured such that the light that flashes in response to the image information signal emitted from the laser unit 21 is reflected by a first mirror 22, and is integrated with the shaft of the scanner motor 23. The light is incident on a deflection mirror 24 attached to the mirror 24, and is repeatedly deflected within a certain angular range. Polarized light is f-θ
The lens 25 forms an image on a straight line at the incident position 6 on the photoreceptor drum 1, and the projection point is corrected so that it moves at a constant speed.
The incident light enters the photoreceptor drum 1 via the second mirror 26 and the cylindrical lens 27, and main scanning is performed by deflecting the incident light, and sub-scanning is performed by the rotation of the photoreceptor drum 1. is written, and a static sWJ image is formed. The components of the writing optical unit 7 are mounted directly on the base cover 28 of the device. In addition, code 29
is a synchronization detection sensor.

The electrostatic latent image formed on the photosensitive drum 1 is developed by the developing unit 3 to form a toner image, which is transferred by the action of the transfer charger 4 onto a transfer paper fed by a pair of registration rollers 11 and 12. Ru. Photosensitive drum 1 after transfer
The transferred paper is fixed by the separated transfer paper transport path unit 13 and then discharged to the paper discharge tray 14 .

On the other hand, the toner remaining on the transfer detection photoreceptor drum 1 is cleaned by the cleaning unit 5 in preparation for the first image formation.

As described above, in this device, the writing optical unit 7 is provided below the photoreceptor drum 1 and the developing unit 3, the automatic paper feeding unit 8 is provided further below, and the transfer section and registration roller pair 11.1- 2 is provided above the photoreceptor drum 1, the transfer paper sent out from the paper feed unit 8 can make a U-turn around the outside of the development unit 3 and be sent to the pair of registration rollers without taking up a large space. It is possible to downsize the device.

Note that the automatic paper feeding unit can also be provided on the side of the apparatus.

A part 30 of the upper cover of the apparatus main body can be flipped up and opened centering on #131 at the right end in the figure of the apparatus, and the transfer charger 4 and the pair of registration rollers 11 and 12 are Part 3 of the upper cover
It is designed to move in unison with the Further, the photosensitive drum 1 is selectively supported so that when a portion 30 of the upper cover is opened, it can remain on the apparatus main body side or be lifted up integrally with the upper cover.

Therefore, when a jam occurs in the transfer paper at the transfer section or the pair of registration rollers 11 and 12, as shown in FIG.
If the transfer charger 4 and a pair of registration rollers are integrally attached to a portion 30 of the upper cover and opened, the transfer paper conveyance path is completely opened, and jammed paper can be easily removed.

The operation of opening the part 30 of the upper cover can be facilitated if, for example, a spring (not shown) is used to automatically open the upper cover when the retaining member is removed.

Note that, as shown in FIG.
It is also effective to remove jammed paper even if it is attached to 0 and released.

Also, as shown in FIGS. 6 and 7, a part 30 of the upper cover
When opening the registration roller pair, one pair of rollers 11 and 12
Alternatively, if the photoreceptor drum 1 is lifted together with the upper roller 11 and the part 30 of the upper cover, it is convenient to separate the photoreceptor from other members and remove it when replacing the photoreceptor.

Moreover, the operability of replacing the cleaning unit 5 and the developing unit 3 is improved.

As described above, according to the present invention, an image recording apparatus can be downsized, and jammed paper can be easily disposed of.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the overall schematic configuration of an apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1,
FIG. 3 is a perspective view showing the structure of the optical writing unit of this embodiment, and FIGS. 4 to 7 are explanatory diagrams each explaining the operation of the apparatus of the present invention. 1... Photosensitive drum 3... Developing unit 4... Transfer charger 5... Cleaning unit 7... Optical writing unit 8... Automatic paper feeding unit 11... Registration roller vs. upper roller 12... Registration roller pair lower roller 13... Fixing units 21-27... Optical writing unit component 30...
Opening/closing part 31 of the upper cover... Pivotal part of the hill cover

Claims (4)

[Claims] (1) Optical writing is performed on the photoconductor drum via the optical writing unit with a light beam according to the image information signal, developed by the development unit to form a toner image, and the toner image is transferred along the photoconductor drum by the automatic paper feed unit. In an image recording device that performs recording by transferring onto transfer paper fed to a transfer section, the optical writing unit is disposed below the photoreceptor drum and the developing unit,
Furthermore, the image recording apparatus is characterized in that the transfer section is disposed above the photosensitive drum, and the transfer paper is fed to the transfer section by a pair of registration rollers with the image surface facing downward. (2) The transfer charger forming the transfer section and the pair of registration rollers are provided integrally with an openable/closable portion of the upper cover of the apparatus main body. The image recording device according to item 1. (3) Claim 1, characterized in that the transfer charger forming the transfer section and the upper roller of the pair of registration rollers are provided integrally with an openable/closable portion of the upper cover of the main body of the apparatus. The image recording device described in . (4) The image recording device according to claim 2 or 3, wherein the photosensitive drum is provided so as to be movable integrally with the openable/closable portion of the upper cover. .