JPS5952277A - Cleaning device of photoreceptor - Google Patents

Abstract

PURPOSE:To prevent an electric leak through a magnetic carrier by interposing a means which relays and conveys the magnetic carrier to make independent electrically a sleeve for a magnetic brush and a toner recovery roll. CONSTITUTION:The relay sleeves 2 and 3 are interposed between the magnetic brush 1 and the toner recovery roll 4 to relay and convey the magnetic carrier, and the brush 1 and the roll 4 are made electrically separate and independent. Consequently, it is not necessary to impress a high voltage for toner recovery to the roll 4 as is the case when no relaying and conveying means is provided, and the electric leak through the carrier is prevented to perform a smooth cleaning. Further, insulation, etc., are facilitated and the circulation path of the carrier is extended to increase the amount of the carrier, reducing its fatigue.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for removing residual toner from the photoreceptor of a Seiko photocopier.

In the Seiko photocopying machine, a latent latent image formed on a photoreceptor is made to adsorb awakened toner to form a developed image, which is then transferred to copy paper.

Due to the necessity of repeatedly cleaning the photoreceptor, it is necessary to remove toner remaining on the surface of the photoreceptor during transfer. A cleaning device is used to do this, and conventional cleaning devices include a rotating brush type, a blade type, and a magnetic brush type.

Since the present invention relates to an improvement of the magnetic brush type cleaning device, first, the conventional device will be explained.

No. 21 shows a conventional cleaning device described in Japanese Patent Publication No. 48-37382. 20 is a magnetic brush device which rotates in the direction of the arrow and has residual toner 11 adsorbed on its surface.

Like the magnetic brush in the current one, it is composed of a non-magnetic metal sleeve 22 and a permanent magnet 24. The sleeve 22 rotates about the shaft 26 as shown by the arrow, and the permanent magnet 24 is fixedly disposed in the vertical position shown. The magnetic carrier 28 packed in 1 m52 is the same as the carrier contained in the two-component developer, and it is the same as the carrier contained in the permanent magnet 2.
It is attracted to the circumferential surface of the sleeve 22 by the suction force of the sleeve 22, and is conveyed as the sleeve rotates.

A corona discharger 65 acts toward the circumferential surface of the photoreceptor 16 . The polarity of the power source 67 of the corona discharger 65 is selected so as to discharge the same polarity as the charged polarity of the toner 11 on the photoreceptor 16. A voltage having a polarity opposite to that of the toner 11 is applied to the sleeve 22 by a power source 60 .

The carrier 28 on the circumferential surface of the sleeve 22 has a permanent magnet 24
The magnetic brush stands up in the shape of a spike near the magnetic pole, and as a result of moving as the sleeve 22 rotates, it comes into sliding contact with the toner 11 on the circumferential surface of the photoreceptor 16 and the carrier 28 . that time.

Due to the voltage applied to the sleeve 22, the toner 11 receives an electrostatic attraction force and is attracted to the carrier 28, so that the toner 11 on the photoreceptor 16 is removed and cleaning is performed.

Carrier 28Fi adsorbing toner 11, sleeve 22
It moves along with the rotation of the tree, and stands up again in the shape of a spike at a position 180 degrees away. At that position, there is provided a metal drum 40 which rotates in the direction of the arrow, to which a voltage is applied by a turtle 44.

Since the voltage applied to the sleeve 2 is more than twice that of the voltage UD, the toner 11 is taken away from the carrier 22 that is in contact with it. The toner 11 that has been smelled and adsorbed to the second metal drum 40 is conveyed as the drum rotates, and is scraped off by the blade 5U that presses against the circumferential surface of the drum 40 and collected once.
It is collected in a container 52.

By the way, in the conventional device, I is three -
/221fC200~1. OOOV (D voltage'
-r must be marked on -r, metal drum 40 EU
, because of the need to provide a potential difference between the sleeve 22 and the sleeve 22, 1. L100~2.0
It is necessary to apply a Narita voltage of 00V. However, if such high pressure is applied, leakage occurs through the carrier, and smooth operation cannot be expected.

The present invention aims to solve the above-mentioned problems by separately providing a magnetic brush device that attracts toner from a photoreceptor and a toner recovery device that separates toner from a carrier. This is characterized by a structure in which carriers circulate between the two.

Next, the present invention will be explained based on the embodiment shown in FIG.

The drum-shaped photoreceptor 16 rotates in the direction of the arrow and reaches the opening 7a of the cleaning device 7 with the negatively charged residual toner 11 still attached. A butterfly is disposed within the opening Za, and a non-magnetic metal sleeve 1 having a permanent magnet 15 fixed therein is disposed, and is rotated counterclockwise.

2.3 is a relay sleeve, both of which are made of non-magnetic material, and like sleeve 1, there is a permanent magnet 16.1 inside.
7 are fixedly arranged.

Relay sleeve 2 is arranged diagonally above sleeve 1.
Rotate clockwise. Relay sleeve 6 is placed above relay sleeve 2 and rotates counterclockwise. Each of these sleeves 1, 2゜6 has a magnetic carrier 28 on its circumferential surface.
By rotating while sucking the carrier 28, a circulation path is formed for the carrier 28 as indicated by arrows A, B, and C, and its operation is as follows.

The operation is similar to that of a pumping sleeve in a developing device.

A souffle lever 8 acts on the surface of the relay sleeve 6, and as a result, the carrier 28 separated from the circumferential surface of the relay sleeve 5 falls to the upper part of the sleeve 1 and accumulates there. This carrier 28 is regulated by doctor 6.
It is attracted to the circumferential surface of the sleeve 1 with a thickness of , and becomes a magnetic brush that sweeps the surface of the photoreceptor 16 (circulating through the -1 circulation paths A, B, and C).

A toner collection roller 4 and a toner collection roller 5 are arranged along the flow path C of the carrier 28, and the carrier 28r
x flows down through them. The toner collection roller 4 rotates in the direction of the arrow.

The blade 9 is in pressure contact with it. A collected toner discharge device 10 is arranged below the blade 9.

A positive voltage of 200 to 500 V (opposite polarity to the toner) is applied to the sleeve 1 by a power source 12, and the same voltage is applied to the toner collection roller 4 by a power source 14. The opposite direction is the opposite.

1 between the toner collection roller 4 and the backward electrode 5.
An electric field of about 1.000 to 5.011 J OV/cTL can be obtained.

Prior to cleaning, the photoreceptor 16 is exposed to a corona atomizer 65.
receives static neutralizing action. As a result, the fp of the photoreceptor 16
At the same time, the troop was attacked.

The amount of negative charge on the toner 11 increases. A magnetic brush formed on the surface of the sleeve 1 by the carrier 28 is attached to the photoreceptor 1.
When the peripheral surface of the sleeve 1 is swept, the toner 11 is negatively charged and attracted to the carrier 28 due to the suction force caused by the positive toner mark on the sleeve 1. This 28-carrier relay sleeve 2.6 is baton-touched and conveyed as shown by arrows A, B, and C. When flowing down the flow path C, the liquid passes between the recovery roller 4 and the facing pole 5, where it is affected by an electric field. This electric field is the negatively charged toner 11
is separated from the carrier 28 and sucked into the collection roller 4.

The toner 11 adsorbed on the collection roller 4 is conveyed as the collection roller 4 rotates, is scraped off by the blade 9, and collected in the single collection toner discharge device 1u. The carrier 28 separated from the toner 11 flows down onto the sleeve 1 and is recirculated. In addition,
The corona discharge 435 may not be provided.

As described above, in the present invention, a means for relaying the magnetic carrier is interposed between the sleeve for forming the magnetic brush and the toner collection roller that electrostatically separates the toner from the single carrier carrier. During the formation of the magnetic brush, the sleeve and toner collection roller can be separated.

It is no longer necessary to use a cylinder that is printed on the toner collection roller and placed on top of the magnetic/rachiform forming sleeve. The inconvenience caused by -/lj leakage can be eliminated, and insulation can be made easier. One advantage of having a sophisticated relay conveyance means is that the circulation of the carrier is longer (4 paths), and the amount of carrier that is contained during that time increases, so the fatigue of the carrier is reduced.
Become.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a front view of a conventional cleaning device. 1...Magnetic brush forming sleeve. 2.6... Relay sleeve, 4... Toner collection roller, 5... Opposing wake pole. 8... Souffle bar, 11... Toner. 16...Photoreceptor, 28...Carrier. Patent applicant Ricoh Co., Ltd. Figure 1

Claims (1)

[Claims] In an apparatus that electrostatically performs cleaning using a magnetic brush using a magnetic carrier, a sleeve for forming the magnetic brush and a toner collection roller that applies an electric field to separate the toner from the magnetic carrier are provided. A cleaning device for a photoreceptor, characterized in that a means for relaying and conveying a magnetic carrier is provided.