JPH0540439A - Photosensitive body destaticizing device for electrophotographic copying device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a photoconductor neutralization device for an electrophotographic device, which irradiates a photoconductor after transferring a toner image on a transfer paper with light at a transfer position to make the potential of the photoconductor surface uniform. Therefore, a specific configuration is provided in which a stable static elimination effect can be obtained even when the distance between the transfer position and the next cleaning device is small. [Constitution] The toner image formed on the photoconductor 1 is transferred onto a transfer paper 8
A separator 5 composed of corona discharge means for facilitating the separation of the transfer paper 8 on which the toner image is transferred and the photoconductor 1 is arranged at a transfer position for transferring to the photoconductor. 1 has a structure in which the discharge electrode wire 5c is arranged in the opened frame, and the light irradiation means 6 for irradiating the photoreceptor 1 after the toner image transfer through the opening 5a with light to remove the electric charge is arranged. A photoconductor charge eliminating device for an electrophotographic apparatus, which is characterized in that

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoconductor charge eliminating device of an electrophotographic apparatus for erasing light on the photoconductor after transfer to remove the charge from the photoconductor.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIGS. In FIG. 2, a charging device 2, a developing device 3, a transferring device 4, a separating device 5, a light erasing means 6 for discharging electricity, and a cleaning device 7 are arranged around the photoconductor 1, and the transfer paper 8 is a photoconductor. 1 and the transfer device 4 and the separator 5 are moved in the direction of the arrow.

That is, a predetermined potential (-
The photosensitive member 1 uniformly charged to 600 V) is irradiated with the exposure 9 modulated with image information to form an electrostatic latent image on the photosensitive member 1.

Then, toner is attached to the electrostatic latent image by the developing device 3 to form a toner image, and the toner image is transferred to the transfer paper 8 at the transfer section.

In the transfer section, a transfer device 4 composed of a corona discharger charges the transfer paper 8 with a polarity opposite to that of the photosensitive member 1 to effectively transfer the toner image, and then the separator. The transfer paper 8 is charged with the same polarity as that of the photoconductor 1 by means of 5 to facilitate the separation of the transfer paper 8 and the photoconductor 1.

The operation timings of the transfer device 4 and the separator 5 are set to be ON when the front end of the transfer paper 8 reaches the transfer position and OFF when the rear end of the transfer paper passes.

Therefore, as shown in FIG. 4, the electric potential on the photoconductor 1 which has passed the transfer position is +100 V in the portion opposed to the transfer paper and -600 V in the portion not opposed to it.
Becomes

In order to reduce and eliminate this difference, the light irradiating means 6 for static elimination is used to uniformly irradiate the photoconductor 1 to reduce the difference as shown in FIG.

However, with the recent miniaturization of the LBP, the photosensitive member 1 also tends to have a smaller diameter. With this smaller diameter, the distance between the separator 5 and the cleaning device 7 becomes smaller, which is shown in FIG. As in the conventional example, there is no place to attach the light irradiation means 6. Therefore, as shown in FIG. 3, a configuration in which the light irradiation means 6 is provided beside the separator 5 below the transfer paper 8 has been considered.

[0010]

However, in the case of the example of FIG. 3, since the photoconductor 1 is de-charged after the transfer paper 8 has passed over the light irradiation means 6, the transfer paper 8 which should be de-charged is Since a part of the photoconductor 1 that did not face each other enters the cleaning device, the charge of this part cannot be removed, and the electric potential of the photoconductor 1 becomes uneven as shown in FIG. 6, which is related to the print quality such as fog. There was a problem that a failure occurred.

[0011]

In order to achieve this object, in the photoconductor charge eliminating device of the electrophotographic apparatus of the present invention, a light irradiating means is provided on the back side of the separator so that the photoconductor starts to be irradiated with light. It's an earlier time.

[0012]

According to this structure, since the light irradiating means for static elimination is located at the same position as the separator, even if the distance between the separator and the cleaning device is small, the portion requiring the static elimination of the photosensitive member is Since the charge can be removed before entering the cleaning device, the potential unevenness can be eliminated.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
The photoconductor 1 is uniformly charged by the charger 2, a latent image is formed by the exposure 9, and the latent image is made visible by the developer 3. Then, it is transferred onto the transfer paper 8 by the transfer device 4. The waste toner remaining on the surface of the photoconductor 1 after the transfer is removed by the cleaning device 6
To be cleaned. After that, the photoconductor 1 is again uniformly charged by the charger 2, and the printing process is repeated. Since the transfer paper 8 is charged by the transfer device 4 so as to be attracted to the photoconductor 1, the transfer paper 8 is supplied with a charge having a polarity opposite to the polarity of the transfer device 4 and separated from the photoconductor 1. The above steps are the same as in the conventional example.

In the embodiment of the present invention, the separator 5 has a structure in which the discharge electrode wire 5c is arranged in the frame body having the openings 5a and 5b in the vertical direction, facing the photoconductor 1, and below the opening. Light irradiation means 6 is provided. This light irradiation means 6
The light from illuminates the photoreceptor 1 after the transfer paper 8 has passed through the opening 5a of the separator 5 to remove electricity. Therefore, since the photoconductor 1 can be discharged at the same time when the transfer paper 8 passes through the separator 5, the photoconductor 1 can be discharged regardless of the size of the gap between the separator 5 and the cleaning device 7. The potential of 1 becomes the same as in FIG.

[0015]

As described above, in the present invention, since the photoconductor is discharged from the back side of the separator by the light irradiation means, the diameter of the photoconductor is reduced, and a sufficient space can be obtained between the separator and the cleaning device. Even in the case where it is not possible, it is possible to eliminate the unevenness of the potential of the photoconductor and to eliminate the print quality trouble such as fog.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a photoconductor charge eliminating device of an electrophotographic apparatus according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional electrophotographic apparatus.

FIG. 3 is a cross-sectional view of another conventional electrophotographic apparatus.

FIG. 4 is a diagram showing a potential after transfer of a photoconductor.

FIG. 5 is a diagram showing the potential of the photoconductor after static elimination.

FIG. 6 is a diagram showing a potential of a photoconductor in another conventional example after static elimination.

[Explanation of symbols]

 1 Photoreceptor 2 Charging Device 3 Developing Device 4 Transfer Device 5 Separator 5a, 5b Opening 5c Discharge Electrode Line 6 Light Irradiating Means 7 Cleaning Device

Claims (1)

[Claims] 1. A corona discharge means for facilitating separation of the transfer paper on which the toner image is transferred and the photoconductor at a transfer position where the toner image formed on the photoconductor is transferred to the transfer paper. A separator is arranged, and the separator has a structure in which a discharge electrode line is arranged in an opening frame facing the photoconductor, and the photoconductor after the toner image transfer is irradiated with light through the opening. A photoconductor charge eliminating device for an electrophotographic apparatus, characterized in that a light irradiating means for performing charge elimination is arranged.