JPS61145572A - Sheet separating device - Google Patents

Abstract

PURPOSE:To prevent a defect in the separation of transfer paper and to discharge the paper by stopping the function of a discharging means unless a developing means is loaded at a specific position. CONSTITUTION:The loading state of the developing device 13 is detected by a connector pin 41 and a connector socket 42 and a high voltage generating device 43 is controlled with the detection signal. When the device 13 is loaded at the specific position, a transfer charger 15 and a separation charger 16 operate normally and when the device 13 is not loaded at the specific position, on the other hand, no electric discharging is performed because they are not connected electrically. Therefore, even if the device 13 is not loaded forgetfully to cause a defect in loading, etc., the transfer paper 17 need not be brought into contact with the surface of a photosensitive body unnecessarily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet separating device for an image forming apparatus such as an electrophotographic apparatus.

[Conventional technology]

Transfer, e.g. as a discharge device, for conventional electrophotographic devices;
In the separation device, after the transfer paper is brought into close contact with the photoconductor using a transfer guide, a transfer charger is used to charge the back side of the transfer paper with a polarity opposite to that of the toner. After transferring the toner to the transfer paper, using a separation charger,
AC discharge or DC discharge with the same polarity as the toner is performed to remove the charge added to the transfer paper during transfer, remove the adhesion force between the transfer paper and the photoreceptor, and reduce the elastic force of the transfer paper. The transfer paper was separated from the photoreceptor using the With this configuration, when there is toner on the photoreceptor, the adhesion is not very strong and it is easy to separate, whereas when there is no toner at all, it is very difficult to separate because the electrodeposition on the photoreceptor surface is good. Therefore, in the case of electrophotographic devices with removable developing devices, if the developing device is not set in the specified position, toner will not be deposited on the photoreceptor even when copying, and as a result, the photoreceptor of the transfer paper will Due to its close contact with the body, it has the drawback of poor separation and frequent jams.

[Purpose of the invention]

Therefore, the present invention eliminates the drawbacks of the above-mentioned conventional example.

In an apparatus including one or more removable developing devices, there is provided a sheet separating device that allows transfer paper to be ejected without causing separation failure even if the developing device is not attached to a predetermined position. It is to provide.

〔Example〕

FIG. 1 shows a schematic perspective view of an electrophotographic apparatus embodying the present invention. A primary charger 11 is placed on the surface of the photoreceptor 10.
After the electrostatic latent image formed by uniformly charging the photoreceptor and irradiating the image exposure 12 on the surface of the photoreceptor is developed into a toner image by the developing device 13, the transfer paper 17 is brought into close contact with the photoreceptor 10 by the transfer guide 14. Afterwards, the transfer charger 15 is used to charge the back side of the transfer paper 17 with a polarity opposite to that of the toner, and the toner on the photoreceptor 10 is transferred to the transfer paper 17 using electrostatic force. 16 is used to perform AC discharge or a discharge in which DC discharge with the same polarity as the toner is applied to remove the electric charge added to the transfer paper 17 during transfer, thereby removing the charge applied to the transfer paper 17 and the photoreceptor 10.
and removes the adsorption force.

Using the elastic force of the transfer paper 17, transfer the transfer paper 17 to the photoreceptor 10.
The mounting state of the developing device 13 is detected by a connector pin 41 and a connector socket 42. Then, based on this detection signal, the high voltage generator 4
3, when the developing device 13 is installed in a predetermined position, the transfer charger 15 and the separation charger 16 operate normally, and when the developing device 13 is not installed in a predetermined position, the electrical If a configuration is adopted in which discharge is not performed by not making a connection, even if the developing device 13 is forgotten to be inserted or is improperly attached, the transfer paper 17 will not be brought into close contact with the photoreceptor surface more than necessary, and jams will be prevented. It has now become possible to separate reliably.

In the embodiments of the present invention, the same effect can be obtained by using, for example, a photocoupler or a Hall element as the means for detecting the mounting state of the developing device.

〔Effect of the invention〕

As explained above, if the developing device is not installed in the specified position, it is possible to reliably separate the transfer paper with a simple configuration in which the transfer charger, separation charger, etc. do not discharge. Became.

[Brief explanation of the drawing]

FIG. 1 shows a schematic perspective view of an embodiment of the invention. 10-m-photoreceptor, 11--primary charger 12
---Image exposure, 13-m-Developing device 14---
Transfer guide, 15-m-transfer charger 16--separation charger, 17--transfer paper 18--cleaning device 41-m-connector pin 42-m-connector socket 43-m-high voltage generator

Claims (1)

[Scope of Claims] In a sheet separation device that separates an image developed on an image bearing member onto a sheet by a removable developing means and then separates the image from the image bearing member, for transferring the developed image onto the sheet. or at least one discharge means for separating the sheet from the image carrier, and the discharge means does not discharge when the developing means is not installed in a predetermined position. sheet separation device.