JPS6158832B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cleaning device for an electronic copying machine, particularly a front cleaning device with a built-in magnetic roll.
It is equipped with a Fur Brush, and in addition to the mechanical effect of the Fur Brush, the magnetic attraction force of the magnetic roll attracts the magnetic toner remaining on the surface of the photoconductor after transfer, increasing the cleaning effect. The present invention relates to a cleaning device for an electronic copying machine.

Conventionally, the cleaning effect of, for example, a photoreceptor on which toner remains in an electronic copying machine has had a great influence on the quality of a copied image. The copying process of a general electronic copying machine will be explained with reference to FIG. 1. A photoreceptor 1 made of an optical semiconductor such as selenium is rotated in the direction of arrow a in the figure. When the entire surface of the photoreceptor 1 is uniformly charged in Figure A and exposed to light through the copy base paper in Figure B, the electrical resistance of the exposed portions other than the base paper image decreases and the charge is lost. That is, a so-called latent image is formed on the surface of the photoreceptor 1 in which charges remain only in the portion corresponding to the image. In FIG. C, when the magnetic toner 2 is supplied by a magnetic brush developing device or the like, the magnetic toner 2 is attracted only to the charged latent image, so-called development is performed, and a visible magnetic toner image is obtained. Further, in FIG. D, the magnetic toner 2 is attached to the photoreceptor 1.
The magnetic toner 2 is electrostatically transferred from the surface of the magnetic toner 2 onto a copying paper 3 such as plain paper, and as shown in FIG. During the electrostatic transfer shown in FIG. D, a portion of the magnetic toner 2 developed on the photoreceptor 1 remains on the photoreceptor 1 as a residual magnetic toner 2'. When the photoreceptor 1 rotates and copies are made by repeating the above-mentioned process A→E, the copied image gradually becomes unclear due to the residual magnetic toner 2'. Therefore, it becomes necessary to remove the residual magnetic toner 2' using a cleaning device shown in FIG. The quality of this cleaning effect has a significant impact on the copying performance of the electronic copying machine.

Conventional cleaning devices use fur made of rabbit hair, synthetic fibers, etc., as shown in FIG. 2, for example.
The brush 4 is rotated at a high speed to scrape the surface of the photoconductor 1, to release the residual toner 2' adhering to the surface of the photoconductor 1, and to remove the toner provided in contact with the fur brush 4. The residual toner 2' adhering to the fur brush 4 is removed by the removal section 5. The thus released residual toner 2' is sucked by a vacuum suction mechanism 6 and collected by a filter 7. However, it is difficult to achieve a sufficient cleaning effect with the above means. If the toner is a magnetic toner, as shown in the example shown in FIG.
A cylinder 9 made of a non-magnetic material having a roll 8 built therein coaxially is provided, and the cylinder 9 is fixed, and the magnetic roll 8 is rotated in the direction of the arrow b shown in the figure. The residual toner 2' on the surface of the photoconductor 1 is attracted by the magnetic roll 8 and adsorbed to the cylinder 9, and the residual toner 2' is transferred to the non-magnetic cylinder by the rotating magnetic field generated by the rotation of the magnetic roll 8. The scraper 11 provided at the tip of the collection box 10 moves on the surface of the collection box 9 in the direction of the arrow c shown in the figure.
It is scraped off and recovered by. When the residual toner 2' on the surface of the photoreceptor 1 is adsorbed to the cylinder 9, if there is a gap between the surface of the photoreceptor 1 and the cylinder 9, the suction force is reduced, so that the residual toner 2' cannot be sufficiently adsorbed. Therefore, a layer of residual toner having a uniform thickness t is always maintained on the surface of the cylinder 9, and the residual toner 2' on the surface of the photoreceptor 1 is brought into contact with and sucked. However, in the so-called magnetic brush cleaning as described above, it is difficult to always maintain a residual toner layer with a uniform thickness t on the surface of the cylinder 9, and in particular, it is necessary to form the residual toner layer in advance at the start of operation. Therefore, it requires a complicated operation. As explained above, conventional cleaning devices are undesirable because they are difficult to achieve a sufficient cleaning effect and require complicated operations.

The present invention aims to solve the above-mentioned conventional problems, and by cleaning the photoreceptor using a fur brush with a built-in magnetic roll, it not only improves the cleaning effect but also provides excellent operability. The object of the present invention is to provide a cleaning device for an electronic copying machine. The present invention will be explained below with reference to FIGS. 4 to 6.

FIG. 4 is a configuration diagram showing one embodiment of the present invention equipped with a recovery device using a vacuum suction mechanism, and FIG. 5 is a configuration diagram showing another embodiment of the present invention equipped with a recovery device using a magnet.
FIG. 6 is a configuration diagram showing an embodiment of the present invention, and FIG.
A configuration diagram showing an example is shown.

Reference numerals 1, 2', 4, 6, and 7 in the figures correspond to those in FIGS. 1 to 3, respectively. A magnet roll 12 is provided coaxially within the core cylinder of the fur brush 4 and in a stationary state regardless of the rotation of the fur brush 4, and is formed to have an odd number of magnetic poles extending in the axial direction; 13 is a magnet for collecting residual magnetic toner; 14 is a cylinder for collecting residual magnetic toner made of a non-magnetic material that rotates in contact with the fur brush 4; and 15 is a cylinder for collecting residual magnetic toner coaxially inside the cylinder 14 for collecting residual magnetic toner. Each of the residual magnetic toner collecting magnet rolls is shown in a static state irrespective of the rotation of the toner collecting cylinder 14, and is formed to have an odd number of magnetic poles extending in the axial direction.

In FIG. 4 showing one embodiment of the present invention, residual magnetic toner 2' on the surface of the photoreceptor 1 rotating in the direction of the arrow a in the figure rotates in the direction of the arrow b in the figure and rubs the surface of the photoreceptor 1. - At the same time, it is released from the surface of the photoreceptor 1 by the brush 4 and is attracted by the magnetism of the magnet roll 12 built into the fur brush 4.
is adsorbed to. When the residual magnetic toner 2' attracted to the fur brush 4 is selected by the fur brush 4 to a position where the same poles of the magnetic poles of the magnet roll 12 are adjacent to each other, the residual magnetic toner 2' is attracted by the magnetic repulsion of the same poles. It is separated from the fur brush 4 by.
The residual magnetic toner 2' separated from the fur brush 4 is sucked in the direction of arrow c in the figure by a vacuum suction mechanism 6 and collected by a filter 7.

Further, in FIG. 5 showing another embodiment of the present invention, as a means for collecting the residual magnetic toner 2' attracted in the same manner as in the embodiment shown in FIG. Collection magnets 13 are arranged opposite to each other in positions where the same poles are adjacent to each other,
and the above-mentioned magnet of the collection magnet 13.
Connect the magnetic pole on the side facing the roll 12 to the magnet.
By making the magnetic poles of the roll 12 opposite to the same magnetic poles, the residual magnetic toner 2' can be recovered magnetically. If the collection magnet 13 is covered with a non-magnetic sleeve and made detachable, the residual magnetic toner 2' collected on the sleeve can be removed by pulling the collection magnet 13 out of the sleeve. It can be easily separated and recovered.

Further, in FIG. 6 showing still another embodiment of the present invention, as a means for collecting residual magnetic toner 2' attracted in the same manner as in the embodiment shown in FIGS. 4 and 5, FIG. As shown in the figure, a cylinder 14 made of a non-magnetic material and containing a magnet roll 15 is installed. The residual magnetic toner 2' is magnetically attracted to the surface of the cylinder 14 by the magnet roll 15. Since the cylinder 14 is rotating in the direction of arrow c in the figure, the residual magnetic toner 2' adsorbed on the surface of the cylinder 14 is affected by the rotating magnetic field generated by the magnet roll 15 due to its relative relationship to the magnet roll 15. When the magnet roll 15 moves on the surface of the cylinder 14 in the direction of the arrow d shown in the figure under the influence, and at the same time moves along with the rotation of the upper cylinder 14 to a position where the same poles of the magnetic poles of the magnet roll 15 are adjacent to each other, the same poles Due to magnetic repulsion, the particles are released from the cylinder 14, fall, and are collected. Note that the residual magnetic toner 2' recovery device is installed in the fifth
If the device uses a magnet as shown in the embodiment of the present invention shown in FIG. It also leads to

As explained above, according to the present invention, the cleaning effect is improved by using a fur brush with a built-in magnetic roll, and the cost is reduced by downsizing the cleaning device by using a magnetic collecting device. Therefore, it is possible to provide a cleaning device for an electronic copying machine with excellent operability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the copying process in a general electronic copying machine, Figs. 2 and 3 are explanatory diagrams showing a conventional cleaning device, and Fig. 4 is an explanatory diagram showing a conventional cleaning device. Fig. 5 is a block diagram showing another embodiment of the present invention equipped with a collecting device using a magnet, and Fig. 6 is a block diagram showing another embodiment of the present invention equipped with a collecting device using a magnetic roll. 1 shows a configuration diagram showing one embodiment of the invention. In the figure, 1 is a photoreceptor, 2' is a residual magnetic toner, 4 is a fur brush, 6 is a vacuum suction mechanism, 7 is a filter, 12 is a magnetic roll, 13 is a residual magnetic toner collecting magnet, and 14 is a residual magnetic toner. Cylinder for toner collection, 15 is a magnet for residual magnetic toner collection.
Each represents a role.

Claims (1)

[Scope of Claims] 1. After developing the electrostatic latent image formed on the surface of the photoreceptor with a magnetic toner and transferring the toner image on the surface of the photoreceptor obtained by the development onto a transfer member, the surface of the photoreceptor is A cleaning device for an electronic copying machine for removing magnetic toner remaining on the copying machine includes a fur brush having a fur attached to the outer periphery of a core cylinder, and a magnetic roll having an odd number of magnetic polarities extending in the axial direction on the peripheral surface. and a collection device for separating and collecting the magnetic toner from the fur brush by applying an outward force to the magnetic toner in the fur brush, the fur brush having its fur applied to the surface of the photoreceptor. The magnet roll is rotatable in such a manner that one magnetic pole faces the photoconductor and adjacent magnetic poles of the same polarity face the collecting means, and the magnet roll is arranged so that one magnetic pole faces the photoconductor and adjacent magnetic poles of the same polarity face the collecting means. A cleaning device for an electronic copying machine, characterized in that the cleaning device is disposed in a stationary state within a core cylinder. 2. Claim 1, characterized in that the recovery device is configured to have a vacuum suction mechanism.
Cleaning device as described in section. 3. The collecting device has a collecting magnet means arranged such that adjacent magnetic poles of the same polarity and magnetic poles of opposite polarity of the magnet roll face the magnetic poles of the same polarity. A cleaning device for an electronic copying machine according to scope 1. 4. The collecting magnet means includes a magnet roll having a columnar shape and having an odd number of magnetic poles extending in the axial direction at intervals in the circumferential direction on the circumferential surface, and a magnet roll rotatably provided on the outer periphery of the magnet roll. 4. The cleaning device for an electronic copying machine according to claim 3, further comprising a cylinder made of a non-magnetic material.