JPS5823075A - Cleaning device - Google Patents

Abstract

PURPOSE:To effectively remove toner through the low-speed rotation of a cleaning brush, and to obtain prolonged life and reduced noise, by providing a bias roller at the upstream side of the cleaning brush, and electrostatically sticking and removing part of untransferred toner. CONSTITUTION:When untransferred toner reaches where a cleaning device 3 is arranged, the untransferred toner comes into contact with a bias roller 5 which rolls on the circumferential surface of a photosensitive drum 1, and the untransferred toner having, for example, the negative polarity is stuck partially to the circumferential surface of the bias roller 5 by the electrostatic attracting force of the bias roller 5 charged to the opposite polarity and then removed from the circumferential surface of the drum 1. The toner stuck to the circumferential surface of the bias roller 5 is scraped off with a blade 6 to fall on the circumferential surface of the drum 1, and is scraped off with a cleaning brush 4 on the downstream side to be filtered by a filter 8 in a discharge blast pipe 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for an electrophotographic copying machine,
In particular, the purpose of this electronic photographic copying machine is to provide a cleaning device that has a low-speed, single-rotation cleaning machine that can be used even when the camera is exposed to crystals, and that has a long life and reduces noise. A series of steps such as uniform charging, image exposure, development, transfer, neutralization, and cleaning are repeated on the photoreceptor formed on the surface of a photoreceptor drum that is driven once at a constant speed. Thus, the untransferred toner that normally remains on the surface of the transfer light body for about 20 minutes during development is removed by the cleaning roller that rotates in contact with the surface of the light body. Conventionally, in order to ensure that this untransferred toner is sufficiently removed, the plan bristle density of the cleaning process, 1 rotation swelling, and the purchase of brush bristle materials, etc. have been specified, and the static elimination conditions of the cleaning process have been specified. A choice had been made. However, if dirt or the like occurs inside the machine, the amount of untransferred toner may exceed 20 cycles during development, which overloads the printer and causes poor cleaning, resulting in afterimages. Such strange images occur. In addition, it is difficult to uniformly transfer the toner image on the surface of the photoreceptor over the entire area, and generally, the leading edge and small areas of the transfer paper have low transfer efficiency, so there is a large amount of untransferred toner in these areas. On the other hand, in order to completely remove the untransferred toner that increases infrequently or in specific areas of the transfer screen as described above, it is necessary to continuously change the cleaning plan, etc. Not only does the device become larger and the installation cost increases, but also the noise is louder and the brush bristles deteriorate, reducing the durability of the device. Furthermore, since the residual rate of untransferred toner is generally 20≦ or less, there is a disadvantage that the cleaning conditions using the cleaning brush are overspecified in this case.

The present invention has been made in view of the above points, and is based on Clean! It is an object of the present invention to provide a cleaning device capable of efficiently removing untransferred toner with one low-speed rotation of a brush. That is, the cleaning device according to the present invention is an electrophotographic copying machine O cleaning device in which a cleaning brush is disposed close to a photoreceptor print and removes untransferred toner. The bias row 2 is disposed near the upstream side of the tube.

1. The bias roller is provided so that it rolls on the surface of the serving photoreceptor, therefore, it rotates once at the same circumferential speed as the moving speed of the photoreceptor fitting. It is better to remove the toner O attached to the bias roller by arranging the blade so that it is in contact with the roller Kll or by arranging the Fi bias roller so that it is in contact with the leaning brush Kll.

In these cases, the bias throw I) is carried out by charging the toner with a polarity opposite to that of the toner, or by grounding it to the -S of the untransferred toner of the light body 1iEi.
[-It can be removed by effectively adhering to the bias throw 2 prior to removal using the bending wiper.

Hereinafter, specific implementation of the present invention will be described with reference to the attached document.
I will explain about Cao Hui. Note that the same items are designated by Fi-1. Figure 1 is a schematic diagram showing one embodiment of the zero invention. Photoreceptor drum 1 (in the figure, only the circumferential surface near the cleaning device 3 is shown) #i SoliiiiffiKs A photoreceptor consisting of a transparent light-transmitting layer and an internal conductor layer is formed, and the photoreceptor drum 1ri The drive is rotated once in the direction of the arrow.

The supporting layer is made of a photoconductive material such as amorphous resin or selenium thread alloy), and the conductive layer is grounded.

In the vicinity of the surface of the photosensitive drum 1, there is a charging device, an image exposure device, a developing device 4&placement, a transfer device (the vh deviation is not shown), a static eliminator 2, and an inventive device in the direction of rotation. 3 is arranged in this 1lIIIK, and the photosensitive drum 1
The photosensitive layer is uniformly charged to, for example, positive polarity by a charging device, the original image is exposed to light by an image exposure device to form an electrostatic latent image, and then an electrostatic latent image is formed by a developing device. Toner charged to the opposite polarity, for example, negative polarity, is supplied to form a toner image, this toner image is transferred to a transfer material by a transfer device, and the transferred image is fixed in a combing process. ii
The untransferred toner remaining on the surface of the photoreceptor drum LO8 without being transferred to the transfer material by the transfer device is transferred to a charge polarity opposite to that of the toner. The electricity is removed by the electrical equipment @2, the amount of charge is reduced, and the electrostatic adhesion force with the photoreceptor drum 10Jli box is weakened.

Cleaninda! kt3t1 mainly includes a cleaning plan 4, a bias roller 5 upstream thereof, and a blade 6 in contact with the bias roller 5Kml. The cleaning brush 4 has a cylindrical or cylindrical O support OJI with a large number of O brush capillary flocks, and is disposed so that its longitudinal direction coincides with the axial direction of the photoreceptor drum 10. 10 Drive one rotation in the opposite direction to the circumferential movement direction,
The tips of the hairs 157 are designed to clean and remove untransferred toner on the photosensitive drum 1. Place cleaning brush 4ti on hood 7, hood 7
An exhaust fan (not shown) K is connected through the ffi pipe 7b so that the air inside the hood 7 is sucked by the exhaust fan. A filter 8 is installed in the exhaust pipe 7b.
A flicker bar 7 is provided at the connection part of the hood 7 with the exhaust pipe 7b.

Therefore, the good toner that is swept away by the cleaning brush 4, interposed in the bristles of the cleaning brush 4, and sent to the flicker brush 7aK is blown out from inside the brush by the dust cover 71, and the airflow is sucked by the exhaust fan. The water then reaches the filter 8 and is filtered and removed by the filter 8. Thus, on the upstream side of the cleaning brush 4 arrangement position, a bias roller 5 whose axial direction coincides with the axial direction of the photoreceptor drum l, can roll within the circumference of the photoreceptor drum l which is rotationally driven. In other words, the photosensitive drum IC
) It is arranged so that it can rotate once at the same circumferential speed as the degree of deviation. The bias roller 5 is made of a metal material or a conductive rubber material on its periphery, and is connected to a positive voltage power supply having a polarity opposite to that of the toner (for example, positive and negative). It is charged to the opposite polarity to the toner. Attach the hood 9 that disturbs the bias roller 5 to the 7-door 7,
A blade 6 is disposed at the attachment part of the hood 9 so that its tip comes into contact with the j1 surface of the bias roller 5, and the blade 6 is used to transfer toner from the bias roller 58 to S.
It is L7 as if dropping. In addition, as the blade 6, the material 040 of sister metal and #ipu ^ Seiku and Takunobu is the best, but if you use a metal one, the combination of the blade 6 and the hood 9 and the hood 7. It is necessary to insulate the insulation.

As described above, when the untransferred toner reaches the position where the round leader dispersion 30 is disposed, it comes into contact with the /4 ear aspirator 5 that rolls onto the roller of the untransferred toner photosensitive drum 1. However, for example, untransferred toner of negative polarity is charged to a polarity opposite to that of the toner, for example, positive polarity. is removed from the circumferential surface of the light drum l. Then, the toner adhering to the surface of the bias roller 5 is scraped off by a blade, and the photosensitive drum 1 mD
It falls on the picture. The toner that has fallen onto the photoreceptor drum IC
The untransferred toner that reaches the bias roller 5Kllll, which is swept by the exhaust pipe and filtered by the exhaust pipe 'IbPJt) filter, is transferred to the static eliminator 2. When this untransferred toner contacts the bias roller 25, it adheres to the circumferential surface of the bias roller 50 due to its electrostatic attraction, but it is not necessarily necessary to provide the static eliminator 2. By appropriately setting the electric potential of the via electric roller 5011, untransferred toner can be attached to the via roller 5. Even if the toner that has adhered to the outer surface roller 50I and is once separated from the photoreceptor drum 10 is scraped onto the circumferential surface of the photoreceptor drum 10 by the blade 6, the toner remains on the circumferential surface of the photoreceptor drum 10. The adhesion force with the adhesive is extremely weak, and it is easily removed by the cleaning cylinder 4. The charging potential of the bias roller 5 is preferably set to such an extent that about 60 to 80 cycles of untransferred toner reaching the bias roller 5 is once deposited within the circumference of the bias roller 5, but it is not always necessary to deposit the entire amount of untransferred toner. Moreover, since the bias roller 5 only needs to be rolled within the circumference of the photosensitive drum 10, there is no need to provide a special drive device. In this way, in the present invention, untransferred toner is attached to the bias roller 5 and the photosensitive drum 1 is
Because it is separated from the 0 peripheral surface, the O removal efficiency is high.
The cleaning brush 4 can be set to rotate at a low speed as in the past, and under the cleaning conditions set to this low speed rotation, if the amount of untransferred toner increases unexpectedly or increases in a specific part of the transferred image. A large amount of toner can be removed sufficiently. Therefore, it is possible to reduce the noise of the cleaning device in a speed copying machine, reduce the power cost, and extend the life of the device, including the life of the brush.

Next, other embodiments of the present invention will be described.

2111 is a schematic diagram showing two embodiments of the present invention.

The cleaning device 3a of this embodiment is installed near the lower peripheral surface of the photosensitive drum 1. That is, in the vicinity of the lower circumferential surface of the photosensitive drum l, the static eliminator 2, the bias roller 5, and the roller V4 are arranged in this order in the rotational direction. The cleaning brush 41 and the bias roller 5 are placed in the cleaning brush 41II.
A 10 m K-flicker is formed and connected to a 7-channel exhaust pipe (not shown) by an exhaust pipe 10b.

Hood 100 bias roller 5111C) Toner discharge 11 between bias roller 5 and static eliminator i2
10c is formed, and an auger spring 11 is installed in this discharge portion 10a with its longitudinal direction aligned with the axial direction of the bias p-250. And food 10
Δ Ear roller 51i10 tip part 10dF (knee is blade 6 and its tip part is bias roller 5C)
It is installed so that it slides into contact with the Jill box.

Therefore, the untransferred toner should be removed first by the static eliminator! After the electrostatic adhesive force with the circumferential surface of the photoreceptor drum is weakened by L2,
A bias roller 5 rotates around the circumference of the photoreceptor drum 10.
A portion of this untransferred toner (approximately 60 to 80 arcs)
The charged toner is charged to a polarity opposite to that of the toner, for example, to a positive polarity, and is attached to the bias roller 50 times and removed from the circumferential surface of the photoreceptor drum 1. The toner particles adhere to the circumferential surface of the bias roller 5, are scraped off by the toner wire blade 6, and fall into the discharge section 10c of the hood IO. Then, due to the rotation of the auger spring ll0N, the toner in the discharge 1110e is sent in the longitudinal direction of the auger gelling 11, and
It is removed from section 10g. The toner remaining on the surface of the photoreceptor drum 1 without being removed by the bias throw 25 is swept away by the cleaner brush 4), and is knocked out from within the brush bristles by the flicker brush 10m and sent to the exhaust pipe 1.
0k is sucked toward a filter (not shown) attached to the exhaust pipe 10b, and is filtered out by the filter. In this embodiment, the toner that adheres to the bias roller 5 and is removed from the photoreceptor drum IOMI movement is routed through a separate system from the exhaust pipe 10b without falling again onto the j5 surface of the photoreceptor drum l. According to OIP output means Augus Gering 11)
The toner is discharged, and the burden of toner removal by the cleaning tool 4 is accordingly reduced. Other effects are similar to those of the tenth embodiment (see FIG. 1).

Next, still another embodiment of the present invention will be described. Third
Figure i is a schematic 1 showing the third embodiment of the present invention.
The cleaning device 3b of example Q1 is characterized in that it does not have a blade. That is, the static eliminator 2, the bias roller 5, and the cleaning brush 4 are arranged in this order in the rotational direction of the photoreceptor V-ram 10. In the first embodiment (see Figure 1) and in the second embodiment, the toner adhering to the circumferential surface of the roller 5 is swept away by the cleaning brush 4. In the case of L+ (Fig. 2, No. 1), the two should also be placed close to each other. 7-D 12 where these cleaning brushes 4 and bias section 5 are placed.
The exhaust pipe 12b and the exhaust pipe 12b are connected to a multiple exhaust fan (not shown).

Therefore, the untransferred toner first has its electrostatic adhesion with the photoreceptor drum 1 circumferentially weakened by the static eliminator 12, and then comes into contact with the rotating bias roller 5 on the circumferential surface of the photoreceptor drum 1. A part of the untransferred toner is electrostatically attached to the circumferential surface of the bias roller 5 and removed from the photosensitive drum IC), and the remaining untransferred toner is removed by the cleaning brush 4.
Arrival at the installation device. And this bias roller 5
Both the toner and the toner on the circumferential surface of the photoreceptor drum 1 are destroyed by the cleaning plan 4, are interposed in the brush bristles, and are sent toward the 7 retrieval bar 12m. Ritsubaba 12a K, it is knocked out of Shibashi's house and filtered into filter 8. This embodiment uses a cleaner brush 4 to remove the toner adhering to the circumferential surface of the bias throw 250 using the blade 6 as in the first embodiment (see Figure 1). Therefore, the device can be simplified. Other effects are similar to those of the first embodiment.

As described in detail above, the present invention provides a bias roller upstream 11 of the cleaning book, and before removing the toner according to the cleaning plan, a portion of the untransferred toner is electrostatically attached to the bias roller and removed. Because it is something that
Even in cases where the cleaning efficiency of untransferred toner is poor or the amount of untransferred toner increases abnormally, it can be removed with one rotation of a cleaning brush at a lower speed than before, and the noise of the cleaning device is reduced. , has a significant i effect in extending life, etc.

It should be noted that the present invention should not be limited to the above-mentioned specific embodiments, but the f! Within the technical fk range of A, i
Of course, an f-shaped example of Iik is possible. For example, in each of the above-mentioned embodiments, the bias roller is charged to the opposite polarity to that of the toner, but simply grounding the bias roller can prevent the untransferred toner from dissipating the charged charge. Since it can be electrostatically attached and removed, it has the same effect on cleaning efficiency.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the first embodiment of the present invention, Fig. 2 is a schematic diagram showing the second embodiment of the invention, and the third diagram of the body is the third embodiment of the present invention.
It is a schematic diagram showing an example. (Symbol Oa Akira) 1...Photosensitive drum 3.3m, 3b-Cleaning device 4...Cleaning brush 5...Bias proverb 6-Blade 7, 9, 10.12-Hood 7
a*1'Oa+12m-7Ritsukapa 8...Filter patent applicant Kinsha Suko Co., Ltd. Agent Person: Masakiri, Figure 1, Figure 2, Figure 3

Claims (1)

[Scope of Claims] 1. In an electrophotographic printer O cleaning device i, in which a cleaning brush is disposed close to the photoconductor 11 image and untransferred toner is removed, the cleaning brush described in 1. A cleaning device that removes mold by installing a bias roller near the upstream side. 2. - The bias throats are rolled on the surface of the photoreceptor 1 and rotated once in the same amount of rotations as the movement of the photoreceptor lIi box. Kiei Noriy=nda device. Claim i! characterized in that the bias roller has an eleven-pointed blade! The cleaner device described in Section 1gi. 4. Patent claim 0, characterized in that it is arranged so as to be in sliding contact with the m-th bias throw 2Fi and the 1-th linda plastic.
fL11K1 The cleaner device described in item 1. 5.1 The cleaner/darler device according to claim 1, wherein the bias roller is charged with a polarity opposite to that of the toner, or is grounded.