JPS6191681A - Cleaning device - Google Patents

Abstract

PURPOSE:To reduce the abrasion of a cleaning roller by rubbing an elastic body brush against the cleaning roller while rotating the brush, and scraping residual toner off the cleaning roller. CONSTITUTION:The elastic body brush 9 is brought into contact with the peripheral surface of the cleaning roller 8 and the residual toner on the cleaning roller 8 is therefore scraped off. This roller 9 is rotatable and also driven to rotate in synchronism with the cleaning roller 8 so that the relative speed difference between the peripheral speed of the surface of the cleaning roller 8 and the peripheral speed of the tip of the brush 9 is specified.

Description

DETAILED DESCRIPTION OF THE INVENTION C Industrial Advantages 111N IJIJ) The present invention is intended for use in image forming apparatuses that perform image forming processes.

[Prior art and inventions] Problems to be solved]

After electrostatically forming a transferable image with toner on the surface of the moving image carrier and transferring the transferred image to a transfer material L on paper, residual toner remaining on the surface of the image 411 ,
The image is removed by removing foreign matter such as fine paper particles generated from the transfer paper and attached to the surface of the image carrier, rosin and talc deposited from the transfer paper, and corona products produced by high voltage generating members during the image forming process. In an image forming apparatus in which a holder is used repeatedly, two sets of cleaning means for removing residual toner and various foreign substances are necessary in order to obtain high-quality copies.

And for this purpose, as a Cleani Nog L stage.

A number of methods have been proposed to use farplano, cleaning plates, webs, etc., but although these conventional cleaning methods can remove residual toner, they remove talc, rosin, etc. present in the transfer paper strips. Or it is not sufficient to remove the colo-so products, etc., and this is the image #I! When deposited on the surface of a carrier, especially in high humidity, these substances absorb moisture and have low resistance, resulting in f! There was a possibility that the electrostatic latent image formed on the surface of the tF+ carrier was significantly disturbed and the copy image quality was significantly deteriorated.

In order to avoid these defects, a cleaning means such as an elastic roller is used to rub the surface of the image carrier, or a magnetic roller is provided at a predetermined distance from the surface of the image carrier to capture the residual toner. A growing number of leaning methods have been proposed.

Elastic roller or magnetic roller (hereinafter referred to as F
In a cleaning device having a cleaning roller (referred to as a cleaning roller), in order to remove toner and the like that have been removed from the surface of the image carrier and deposited on the above-mentioned cleaning roller, a uT flexible +'b Press a scraper made of hard wood or resin against the cleaning roller, or
They are provided at predetermined intervals.

When using a cleaning a-ra consisting of one elastic body, the scraper knife 1: touches and rubs the cleaner.
This/Crawler 1. Since the toner and the like are removed, problems such as abrasion and deformation of the surface of the cleaning roller and abrasion and deformation of the scraper have occurred. Also, 1' of the roller and scraper as described above? Abrasion or scratches on the surface of the R carrier due to wear or deformation.

The adhesion of talc, rosin, etc. or corona products as described in Section 11 can cause significant deterioration of the copied image and cause damage to the image. This was a factor in points.

[Object of the Invention and Stage F for Solving the Problems] The present invention has been proposed to solve the above-mentioned problems, and includes an elastic brush installed on the surface of the cleaning roller.
E contact with the cleaning roller to remove residual toner and the like on the cleaning roller. As a result, the external force or local stress acting on the cleaning roller can be reduced compared to the conventional method, making it possible to reduce wear and deformation of the cleaning roller, allowing normal copy images to be maintained for a long period of time. , it became possible to obtain stable performance.

In addition, by making the elastic brush cylindrical (roller-shaped) and rotating the brush, it is possible to increase the relative speed between the cleaning roller surface and the elastic brush, improving the effectiveness of removing residual toner, etc. It became possible to do so.

Further, when the IIP rubber brush is rotated, the elastic body plan is made into a spiral shape to discharge residual toner etc. removed from the cleaning roller to the outside of the cleaning device. It is now possible to release.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is an explanatory view of the main parts of the application of Kinoe IJI to an electrophotographic device. The surface of the photoreceptor is uniformly charged by the (t) electric device 2 placed around the body 1, an electrostatic latent image is formed by the optical image 7, and then the latent image is developed by the developing device 3. be converted into This transferable image is then transferred to a transfer material 4, mainly made of paper, which is guided to a transfer site having a transfer electrode 5, and the transfer material carrying the toner image reaches a fixed position (not shown). On the other hand, the toner that did not contribute to the transfer at the transfer site directly adheres to the surface of the photoreceptor and reaches the cleaning device 6. At this position, the surface of the photoreceptor is contaminated with residual toner as well as rosin 9 talc or corona products precipitated from the fine paper powder as described above.

In this embodiment, only one cleaning device 6 is provided for the photoreceptor 1.
A cleaning blade 6a made of an elastic material comes into contact with the photoconductor L in the longitudinal direction of the photoconductor L, and a cleaning blade F6a of the cleaning blade F6a is provided with a housing extending parallel to the photoconductor F6a. On the upstream side in the direction of rotation,
A cleaning roller 8 is installed inside.

A cylindrical elastic blank 9 is rotatably attached so as to press against and slide against the surface of the clinching roller '8. Further, the elastic brush 9 has a spiral shape as shown in FIG.

Here, at the above-mentioned transfer site, residual toner, etc. (in addition to toner, rosin deposited from a piece of fine paper powder) that has entered the cleaning device without interfering with the transfer and remaining attached to the surface of the photoreceptor. , talc, or corona products) is adsorbed by the Clininoglolla 8.

The remaining portion is removed from the photoreceptor 1 by the cleaning blade 6a.
It was scraped off onto Cleanino Glora B.

As described above, residual toner and the like removed from the surface of the photoreceptor 1 are conveyed by the cleaning roller 8 to a position opposite to the photoreceptor 1 when viewed from the cleaning roller 8.

In this embodiment, the planar material 9 is brought into contact with the circumferential surface of the cleaning roller 8, thereby scraping off residual toner and the like on the cleaning roller 8.

Further, the swing 9 is rotatably attached,
Furthermore, it is rotationally driven in synchronization with the cleaning roller 8 so that the relative speed difference between the peripheral speed of the surface of the cleaning roller 8 and the peripheral speed of the tip of the brush 9 becomes a predetermined value. In this embodiment, the brush 9 has a spiral shape as shown in FIG.
For example, when the toner is rotated in the direction of arrow A in the figure, a force is applied to convey the toner in the direction of arrow B, and residual toner and the like are automatically discharged from the apparatus. Here, the rotational speed of the cleaning roller 8 and the rotational speed of the cleaning roller 9 when the swing 9 is formed into a spiral shape are at least the same in order to scrape off the residual toner etc. on the cleaning roller 8 evenly and evenly. It is configured so that it does not occur.

Further, as shown in FIG. 3, when the cleaning roller 8 and the spiral elastic brush 9 have a contact angle α rad, the rotation speed of the cleaning roller 8 is set to DI/se.
e, the number of rotations of the brush 9 is E'/'5 e C, and the number of spiral threads of the brush 9 is n.

By providing a difference in rotational speed so that xD<nXE is satisfied, residual toner, etc. on the cleaning roller 8 can be removed.

Since the cleaning roller 8 scrapes off evenly and evenly during one rotation, it is impossible to obtain a high quality image.

〔Effect of the invention〕

As explained above, by making the cleaning roller rub with the elastic brush while rotating to scrape off residual toner, etc. on the cleaning roller, external forces and local stress acting on the cleaning roller can be removed. This makes it possible to reduce deformation, wear, etc. of the cleaning roller.Furthermore, if the elastic brush is made into a spiral shape, it will be possible to reduce the amount of material scraped off the cleaning roller. It is now possible to provide a cleaning device with the function of discharging residual toner, etc., and the conventional discharging means is no longer necessary, making it possible to provide a cleaning device at a lower cost than in the past.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the main parts of a copying machine to which an embodiment of the present invention is applied, FIG. 2 is a cross-sectional view showing the main parts of a cleaning device to which this embodiment is applied, and FIG. 3 is a cleaning machine. FIG. 3 is a longitudinal cross-sectional view of a roller and an elastic brush. In fig. 1 is a photoreceptor, 6 is a cleaning device, 6a is a cleaning blade, 8 is a cleaning roller, and 9 is an elastic brush. Figure 1 No.? figure

Claims (3)

[Claims] (1) A cleaning blade facing the image carrier, a cleaning roller upstream of the cleaning blade when viewed in the running direction of the image carrier, and an elastic brush that rubs against the surface of the cleaning roller under pressure. A cleaning device comprising: (2) The cleaning device according to claim (1), wherein the elastic brush has a cylindrical shape and is rotatably supported. (3) The cleaning device according to claim (1), wherein the elastic brush has a single or multiple spiral shape.