JPS62109066A - Device for preventing transfer deviation of recorder - Google Patents

Abstract

PURPOSE:To eliminate the fluttering of transfer paper and to obtain sharp image having no black lines on a transferred image by providing a semi-looped resist upper guide made of a specific material to the route of the transfer paper for a resist roller pair and transfer inlet so as to contact said route. CONSTITUTION:A resist lower guide 17 is provided between the resist rollers 14, 15 and the transfer inlet guide 16 on the bottom surface of the line for the passage of the transfer paper (alternate long and short dash line) and the resist upper guide member 18 is provided atop the line for the passage of the transfer paper. The member 18 is made of a polyester film having about 0.1mm thickness and sags like a counter loop contiguously to the rollers 14, 15 and is provided in contact with the line for the passage of the transfer paper. The transfer paper which progresses according to the rotation of a photosensitive drum 8 is transferred with a toner image on the drum 8 by a transfer charger 19 and is then separated from the drum 8 by a separating charger 20. The transfer paper is conveyed by a conveyance part 21 and is subjected to image fixing in a fixing part 7. The transfer paper is then successively loaded on a paper discharge tray 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a guide member for transfer paper immediately after a registration roller in a recording device such as a dry type electrophotographic device.

[Prior Art] Transfer paper in a recording device is guided to a paper guide plate via a paper feed roller, stops once at a registration roller section, and is sent to a photoreceptor drum at a predetermined timing to collect the visualized toner image. During the transfer process, when the transfer paper is carried out from the registration roller and the rearmost edge of the paper leaves,
There is a drawback that the shock of being released from the sandwiched state between the registration rollers causes the transfer paper to shift during transfer, resulting in black streaks appearing on the image. This development tends to become more noticeable as the transfer paper becomes thicker.

[Objective] Therefore, the present invention provides a recording apparatus using a dry electrophotographic process from a paper feeding process to a transfer process.

Regardless of the paper thickness of the transfer paper, the shock caused when the trailing edge of the transfer paper leaves the registration roller during the transfer process is moderated to prevent the flapping phenomenon of the transfer paper from occurring.
It is an object of the present invention to provide a device capable of obtaining a clear image without black streaks on a transferred image.

[Configuration] The configuration of the present invention is such that in a recording apparatus using a dry electrophotographic process, registration 1-5 is applied on the transfer paper conveyance path between the registration I-roller and the transfer entrance kite of the transfer charger.
The apparatus is characterized in that a register 1 to upper guide member made of a half-loop synthetic resin film is provided adjacent to the roller so as to be in contact with the path of the transfer paper.

An embodiment of the present invention will be described below with reference to the drawings.

Example FIG. 1 shows a transfer type recording apparatus to which the present invention is applied.

FIG. 2 is a schematic configuration diagram of a laser printer using a dry electrophotographic process, and FIG. 2 is an enlarged view of a portion from a registration roller to a transfer charger.

The recording apparatus 1 includes an optical document sending section 2, a paper feeding section 3, a transfer section 4, a developing section 5, a cleaning section 6, a fixing section 7. Photoconductor tram8. It has a built-in charger 9 and a paper discharge tray 10.

As the drum rotates, the surface of the photoreceptor tram 8 first
It is uniformly charged by the charger 9.

Next, exposure scanning is performed by the optical writing section 2, and an electrostatic latent image is formed on the surface of the photoreceptor drum 8, and this electrostatic latent image is combined with the I-toner image developed by the developing device 5. Become. on the other hand,
From the paper feed section 3, the transfer paper passes through paper feed rollers 11 and 12, is guided over the paper kite board 13, and is transferred from the register 1 to the roller 1.
4.15. After the transfer paper temporarily stops at the registration rollers 14 and 15, it is guided by the transfer entrance guide 16 and sent to the lower part of the photoreceptor drum 8 at the timing when it meets the 1-toner image on the photoreceptor tram 8.

Between the registers 1 to rollers [4, 15 and the transfer entrance guide 16, a resist lower guide 17 is provided below the transfer paper passing line (indicated by a dashed line in the figure), and a resist upper guide is provided above the transfer paper passing line. A member 18 is provided (see FIG. 2). The resist upper guide member 18 has a thickness of O, l.
It is made of a polyester film of approximately +nm, and is provided adjacent to the register 1-roller 14, 15, hanging down in an anti-loop shape, and in contact with the transfer paper passing line.

So I measured the timing with registration rollers 14 and 15,
The fed transfer paper passes between the resist 1-lower chi 1-17 and the resist upper guide member 18.
The photosensitive drum passes through the passage line while being in contact with the transfer entrance guide 1G, and enters the gap (about 1 to 2 um) between the transfer entrance guide 16 and the photosensitive drum 8.

The transfer paper advances as the photoreceptor tram 8 rotates.

After the 1-ner image on the photoreceptor tram 8 is transferred by the transfer nayajar 19, it is separated from the photoreceptor drum 8 by the separation charger 20, is transported by the transport section 21, and the image is fixed in the fixing section 7. Paper discharge 1~ray+Q
They are loaded one after the other.

[Effects] As described above, in the present invention, the above-mentioned material and the half-loop resist guide are provided in the path of the transfer paper between the pair of registration rollers and the transfer entrance so as to be in contact with the path.
The shock at the moment when the rear end of the transfer paper leaves the registration roller is suppressed by the resist upper guide, reducing the transmission of shock to the transfer section and eliminating the fluttering of the transfer paper.

This unevenness will appear more if the transfer paper is thicker, but the loop-shaped resist guide is held over the transfer paper regardless of the paper thickness, so that the trailing edge of the transfer paper is between the register 1 and the roller during transfer. It is possible to prevent image displacement (transfer displacement) that occurs when the sheet is removed. Therefore, the image transferred to the transferred transfer paper is clear and free of black lines.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a transfer type recording apparatus to which the present invention is applied, and FIG. 2 is an enlarged view of the portion from the register 1 roller to the transfer charger. l...Recording device, 2...Optical letter sending unit, 3...
...Paper feeding section, 4...Transfer section. 5...Developing section, 6...Cleaning section. 7... Fixing section 8-... Photosensitive drum 9...
・Charger, 10... Paper output tray, 14.1
5...Registration 1-roller, 16...Transfer entrance kite, 18...Regist upper guide member.

Claims (2)

[Claims] (1) In a recording device using a dry electrophotographic process, a half-loop synthetic resin film is placed adjacent to the registration roller pair on the conveyance path of the transfer paper between the registration roller pair and the transfer entrance guide of the transfer charger. 1. A transfer misalignment prevention device for a recording apparatus, characterized in that an on-registration guide member is provided so as to be in contact with a path of transfer paper. (2) The transfer misalignment prevention device for a recording apparatus according to claim 1, wherein the resist upper guide member is made of a polyester film having a thickness of about 0.1 mm.