JPS58181075A - Transfer paper separating device - Google Patents

Abstract

PURPOSE:To execute destaticization of transfer paper immediately after transfer, and to simultaneously execute attenuation of the back potential of the transfer paper and separation of the transfer paper, by providing a titled device so that the shortest distance point of a corona wire of a transfer charger is positioned in the boundary of a corona discharge area of the transfer charger side. CONSTITUTION:When transfer paper 3 synchronizes with formation of a toner image on the surface of a photosensitive drum 1 and enters into a discharge area of a transfer charger 4, the transfer is executed onto the transfer paper 3 by corona discharge. Acorona discharge current shows the maximum in the shortest distance P of a corona wire 9, therefore, when passing through the point P, the transfer is completed already, therefore, the separation is executed immediately. In this case, since the transfer paper 3 is in a destaticizing discharge area of a separation charger 5, therefore, it is destaticized by the separation charger 5 and is separated, and accordingly, no peel-off discharge is generated, no toner image is put out of order, and also since this separation is executed immediately after transfer, no transfer efficiency drops.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charger-type transfer separation device for use in electrophotographic devices and electrostatic recording devices.

An electrostatic latent image is formed on the surface of a latent image carrier such as a photoreceptor or protein using electrophotography or electrostatic recording, and colored fine particles called toner are attached to the dough to visualize the stiffness. 5
A device to obtain a copy by transferring the J statue to a transfer material such as JI is known. The most common methods for transferring visible toner onto transfer paper are the corona discharge method using a corona charger and the bias roller single method using a roller to which a bias voltage is applied, or the corona discharge method because it is simple. or occupy the mainstream. However, the corona discharge method has the drawback that if the timing of the contact and separation of the transfer paper σ) from the light source is not set appropriately, the toner image may be disturbed or transfer omissions may occur. . In other words, if the transfer paper enters the corona discharge area while the transfer paper is not in close contact with the photoreceptor, the nitrogen gap will be removed. Since the transfer of toner begins through the gap, the image becomes irregular and blurred due to the toner that has moved through the gap. Furthermore, if the transfer paper is separated from the photoreceptor while its back surface potential is high, the potential difference with the surface of the photoreceptor becomes large and separation discharge occurs.

The toner image is greatly disturbed. Continuously, the back side t1X1. If separation is performed after the toner has attenuated, the surface potential of the photoreceptor becomes relatively high, and reverse transfer occurs in which the toner image that was once not transferred to the transfer paper is transferred to the photoreceptor surface again, resulting in transfer omission. . Therefore, in order to prevent reverse transfer, it is preferable to separate the transfer paper immediately after transfer, or else there is a problem that the above-mentioned separation discharge may occur and the toner image may be disturbed.

Is this dilemma the purpose of this invention? It is an object of the present invention to provide a transfer separation device capable of obtaining transferred toner images with high transfer efficiency, that is, high image density and good image quality.

The transfer separation device according to the present invention includes a transfer corona charger for transferring a toner image formed on the surface of a latent image bearing member such as a photoreceptor onto a transfer material that is continuously rolled, and a transfer corona charger that first removes static electricity from the transfer material. A separation corona charger for separating the transfer material from the surface of the latent image carrier is provided, and the shortest point of the corona wire of the transfer charger on the surface of the latent image carrier is located in the transfer charger side corona discharge area of the separation charger. The transfer charger G111 shield plate σ) of the field separation charger that regulates the boundary so that it is within the boundary has a defined characteristic.

According to this invention, the separation charger eliminates the charge on the transferred paper immediately after the transfer, so that the attenuation of the transfer paper backside potential and the separation of the transfer paper cannot be performed at the same time. Therefore, neither peeling discharge nor reverse transfer occurs, and the transferred toner 11 with high single image density and good image quality can be obtained.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. In the figure, the first circle indicated by the symbol l is a photosensitive drum. The photosensitive drum l rotates in the direction of the arrow, and around it are equipped with a charger, an exposure optical system, a developing device, etc. (not shown). The toner image formed on the surface is transferred onto the transfer paper 3 by the transfer separation device 2. The transfer separation device 2 includes a transfer charger 4 on the upstream side of the moving force of the surface of the photoreceptor drum 1 and a separation charger 5 on the downstream side 9111.

The partition plate 6a in the middle is integrated with the shield plate 6 which is common to Y. Transfer paper 3 is placed on the outside of the upper part of the shield side plate 6b of the transfer charger 4. Photosensitive drum IF
An entry guide 7 for guiding the paper toward the surface of the photoreceptor drum 1 is integrally provided on the shield side plate 6C of the separation charger 5, and an entry guide 7 for guiding the transfer paper 3 in the direction 11 from the surface of the photosensitive drum 1 is provided on the shield side plate 6C of the separation charger 5. Separation guide 8 is being investigated. Note that the photosensitive drum 1 of the transfer paper 3 is placed on the entrance guide 7.
In order to further improve the adhesion to the surface, it is preferable to laminate a guide plate 7a, for example made of Mylar, which can be bent to some extent by the square of the transfer paper 3. Regarding such a transfer separation device, a patent application filed on March 12, 1982 by the same applicant as the present application
Utility model registration application (1), (2) filed on 1983
This is detailed in the application for fee permission (1) submitted on March 24, 2018.

In such a transfer separation device, the irradiation area of the corona discharged from the corona wire 9 of the transfer charger 4 is defined by the tips of the grooves of the central shield plate 6a and the shield side plates 6b; The corona discharge area from the corona wire 10 of 5 is located on the central shield plate 6. o] Tip and shield side plate 6C
′ respectively defined by the bends in the curves. In this embodiment, in both the fidget charger 4.5, the discharge area on the downstream side of the photoreceptor moving force improvement l1il11 is made thicker to expand the discharge area. The present invention also provides a corona wire 9 of the transfer charger 4.
Point P directly above, that is, corona wire 9 and photoreceptor drum 1
In many cases, the stiffness is located on the surface of the photoreceptor drum 1 on the line connecting the corona wire 9 and the center 0 of the photoreceptor drum l, which is the point P on the surface of the photoreceptor drum 1 where the distance between the corona wire 9 and the center 0 of the photoreceptor drum l is the shortest. be. In order to position this QP on the upstream side of the separation charger 5, that is, within the boundary of the discharge area of the transfer charger 4 and 11,
In other words, the height of the tip is determined. The quality or position of the tip of the shield side plate 6b that regulates the discharge area on the upstream side of the other transfer charger 4 is as follows.
iie, after the transfer paper 3 comes into close contact with the photosensitive drum lfi, it is set so that it enters the discharge area C-
Sleep (・ru.

Transfer paper 3 is sent toward the surface of the photoreceptor drum 1 in synchronization with the formation of a toner image on the surface of the photoreceptor drum 1.

The transfer charger 4 is superimposed on the toner image on the photoreceptor.
When the toner enters the discharge area, the toner is transferred to the transfer paper 3 by a corona discharge having the same polarity as the latent image charge holding the toner, and transfer is performed. Since the corona discharge current normally shows a maximum at the shortest distance point P of the corona wire 9, it is assumed that the transfer has already been completed when this point P is passed.

However, after passing this point PY, it should be possible to separate the transfer paper immediately, and it is better to do so as soon as possible after the completion of transfer to avoid the possibility of reverse transfer due to attenuation of the back side of the transfer paper. It is considered that this method is more preferable in terms of transfer efficiency. However, in the past, when this was done, the potential difference between the transfer paper and the photoreceptor surface increased due to the high back potential of the transfer paper, causing peeling discharge and greatly disturbing the toner image. This caused a decrease in Il content and spotty fogging.

In contrast to this, in this invention, the transfer charger 4
At the shortest distance of the corona wire 9σ), and at θ) when the white wire is within the static elimination discharge area of the separation charger 5, the transfer paper 3 on the photoreceptor is separated while being subjected to static elimination by the separation charger 5, and therefore the peeling discharge is This does not occur and the toner image is not disturbed. Furthermore, since this separation is performed immediately after transfer, there is no reduction in transfer efficiency. In this case, the transfer discharge current of the transfer charger 4 is directly above the corona wire 9, Ii
! Since iiP is within the separated discharge region, it is thought that the maximum value will be shown at a point somewhat upstream of the directly above iiP.
I think the transcription is complete at that point.

As described above, with the transfer separation device of the present invention, a transferred toner image with high transfer efficiency and high image density and good image quality can be obtained. The transfer separation device of the present invention is not limited to the integrated type as in the above-mentioned embodiment fy1, but may be provided with an independent transfer charger and a separate charger, and various methods may be used using known techniques. Can be transformed.

[Brief explanation of the drawing]

The figure is a schematic explanatory diagram showing one example of the present invention. l... Photosensitive drum A, 2... Transfer separation device, 3...
・Transfer paper, 4... Transfer charger, 5... Separation charger, 6... Shield &, 7.8... Kite, 9
．． 10...Corona wire

Claims (1)

[Claims] A transfer charger is used to transfer the toner formed on the surface of the latent image carrier onto a transfer material layered on top of the toner. A transfer separation device comprising a separation charger for separating the latent image carrier from the surface of the latent image carrier, the transfer charger side discharge at the shortest distance point of the transfer charger's corona wire on the surface of the latent image carrier or the transfer charger side discharge of the charger. 9 The height of the shield plate that regulates the boundary of the transfer charger side discharge area of the separation charger so that it is within the boundary of the shell area? A transfer separation device that produces a fixed percentage image.