JPH0369976A - Electrophotographic recording device - Google Patents

Abstract

PURPOSE:To remove the sudden variation of electric field and to obtain an excellent image by gradually destaticizing an unfixed toner image which is transferred to a transfer material on the way of conveying the transfer material to a fixing means with the aid of a conveying belt which is electrostatically charged to have the same polarity as the transfer material. CONSTITUTION:The conveying belt 4 for conveying the transfer material 6 to the fixing rollers 7 and 7 after transfer and separation, a transfer charger 2 having a window 3 which is provided so as to electrostatically charge the conveying belt 4 and a destaticizing brush 5 are provided in a recording device in which the toner image stuck to the transfer material 6 which is separated from a photosensitive drum is stably conveyed. The transfer material 6 and the conveying belt 4 which are electrostatically charged by the transfer charger 2 are gradually destaticized by the destaticizing brush 5 on the way of conveying the transfer material to the fixing roller 7. The irregularity in the unfixed toner between the photosensitive drum 1 and the fixing rollers 7 and 7 is prevented, thereby improving image quality.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic recording device, and particularly to an electrophotographic recording device capable of stably conveying a toner image attached to a transfer material separated from a photosensitive drum. It relates to an electrophotographic recording device.

[Prior Art] Generally, an electrophotographic recording apparatus is generally composed of an electrostatic latent image forming mechanism, a developing mechanism, a transfer separation mechanism, a cleaning mechanism, and a fixing mechanism.

An electrostatic latent image forming machine performs image exposure on a uniformly charged photosensitive drum (photosemiconductor) to form an electrostatic latent image. The developing mechanism attaches colored charged particles (toner) to this static latent image to form a visible image (toner image gA), which is a visible image (powder image).
is transferred onto a transfer material by a transfer separation mechanism, and at the same time, the transfer material is separated from the photosensitive drum. Thereafter, the transfer material having the unfixed toner image is fixed by a fixing mechanism and discharged to the outside of the apparatus. Note that the toner remaining on the photosensitive drum is removed by a cleaning mechanism in preparation for the next latent image formation.

In such conventional devices, transport from the transfer separation stage I to the fixing stage is performed by a transport belt, but a non-negligible electric field exists in the transport path of the transfer material carrying the unfixed toner image. was.

[Problems to be Solved by the Invention] In the conventional electrophotographic recording apparatus described above, transport from the transfer separation mechanism to the fixing i-structure is performed by a transport belt, and the transfer material having an unfixed toner image is transported. Since a non-negligible electric field exists along the conveyance path, there is a drawback that the unfixed toner image on the transfer material is disturbed if the electric field fluctuates suddenly on the conveyance path.

Disturbance of the unfixed toner image causes a deterioration in the image quality of the direct electrophotographic recording apparatus, making it impossible to perform good recording.

[Means for Solving the Problems] An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an electrophotographic image with good image quality by eliminating the disturbance of unfixed toner between the photosensitive drum and the fixing means. The purpose is to provide a recording device.

The electrophotographic recording apparatus of the present invention includes a conveyor belt made of a material with a high dielectric constant that conveys the transfer material to a fixing means after transfer separation, and a transfer charger having a window provided for charging the conveyor belt. and a static eliminating means for gradually neutralizing the static electricity from the conveyor belt.

[Example] Next, an electrophotographic recording apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a main part of an embodiment of an electrophotographic recording apparatus according to the present invention.

As illustrated, the electrophotographic recording device of the present invention includes:
Roughly speaking, a conveyance belt 4 conveys the transfer material 6 after transfer and separation to a fixing roller 7.7, a transfer charger 2 having a window 3 provided for charging the conveyance belt 4, and a conveyance belt. 4 and a static elimination brush 5 for gradually eliminating static electricity.

The conveyor belt 4 is made of a material with a high dielectric constant, such as nylon, so that it can be charged.

Next, the operation of the electrophotographic recording apparatus of the present invention will be explained.

In the figure, a toner image on a photosensitive drum 1 is transferred by a transfer charger 2 onto a transfer material 6 that has been conveyed through an entry guide 8 . After the transfer process has been completed, the transfer material 6 is conveyed by the conveyor belt 4 to a pair of fixing rollers 7.7 with the toner image electrostatically attracted thereto, that is, in an unfixed state.

As described above, since the conveyor belt 4 is made of a material with a high dielectric constant, such as nylon, it is charged to the same polarity as the transfer material 6 by corona discharge from the window 3 provided in the transfer charger 2. Further, the static elimination brush 5 is provided at a position where the static electricity is gradually eliminated midway through the conveyance path of the transfer material 6 on the conveyance belt 4.

By providing such a static elimination brush 5, the transfer charger 2
The charged transfer material 6 and conveyance belt 4 are gradually neutralized while being conveyed to the fixing roller 7.

[Effects of the Invention] As explained above, the present invention conveys an unfixed toner image transferred onto a transfer material by a transfer charger to a fixing means by a conveyance belt charged to the same polarity as the transfer material. , and by gradually removing the charge during the process, there is an effect that sudden fluctuations in the electric field can be eliminated and a good image can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a main part of an embodiment of an electrophotographic recording apparatus according to the present invention.

Claims (1)

[Scope of Claims] A conveyance belt made of a material with a high dielectric constant for conveying a transfer material to a fixing means after transfer and separation; a transfer charger having a window provided for charging the conveyance belt;
An electrophotographic recording apparatus comprising: a static eliminating means for gradually eliminating static from the conveyor belt.