JPS6041076A - Cleaning device - Google Patents

Abstract

PURPOSE:To recover efficiently and sanitarily residual toner and carriers on a recording body without increasing the size of a cleaning device by allowing such a roller that a resistance layer impressed with a specific voltage is covered with a dielectric to rotate in contact with the recording medium. CONSTITUTION:When a photosensitive body 1 is charged negative electrostatically and toner and carriers 15 stick to the surface, the resistance layer 11 of the roller is impressed with a high DC voltage having the (-) polarity opposite to the (+) polarity that the toner and carriers 15 have to attract the toner and carriers on the surface of the photosensitive body to the surface of the roller 10, and the toner, etc., never remain on the surface of the photosensitive body 1. The toner, etc., sticking to the roller 10 are scraped off with a brush 14 and never stick again to the photosensitive body 1. A corotron 16 is installed in front of the roller 10 and impressed with a positive voltage from a power source 17 to equalize the photosensitive body 1 in polarity to the toner and carriers, further improving the cleanability.

Description

Detailed Description of the Invention [Technical Field] In order to maintain high print quality over a long period of time, the present invention provides a recording medium using a roller whose resistive layer is coated with a dielectric and a predetermined voltage is applied to the resistive layer. The present invention relates to a cleaning device that removes residual toner, carrier, etc. on a recording medium by contacting the recording medium.

[Prior art]

As a conventional cleaning device for a transfer type electrostatic recording device, an electrophotographic copying machine, etc., there is one shown in FIG. 1, for example.

This cleaning device is installed in contact with the surface of a photoreceptor 1 on which recorded information (including image information, document information, etc.) is formed as an electrostatic latent image, and is transferred after toner development. A fur brush roll 2 for brushing off toner on the photoreceptor with a rotating brush made of natural or synthetic fibers, a brush housing 3 for housing the fur brush roll 2, and a brush housing for brushing off toner adhering to the brush. Fritzcano (-
4, a fan 5 which is attached to the end of the brush nose 3, and a fan 5 which draws out the toner removed by the flicker bar 4 and all of the toner adhering to the brush to the outside of the brush by the air flow; It consists of a filter lug 6 that stores the attracted toner and carrier.

In the above configuration, the residual toner adhering to the photoreceptor 1 is brushed off by the rotating fur brush roll 2, a part of it is scattered in the brush/S brush roll 3, and the residual toner adhering to the book is removed. Furi is brushed off by Carver 4. ).

All of these toners in the cleaning ring 3 are captured by the fan 5 in the filter (lug 6).Such a far-plan cleaner has a large capacity compared to the blade cleaning unit, which requires lubrication between the blade and the photoreceptor. (On the other hand, there is a fur brush cleaner in 531, which provides stable cleaning performance.)
Since lubricity is required between the recording medium and the recording medium, residual toner, etc., may pass through, resulting in poor cleaning, which limits the improvement in reliability.

However, in conventional cleaning devices, brushes,
It requires a filter bag, fan, etc., which increases the size and cost, and the structure allows toner etc. to easily scatter, which is unfavorable from a sanitary standpoint.If brush wiping is insufficient, a film of toner, carrier, etc. forms on the surface of the recording medium. There is a risk that it will be done. In particular, in transfer-type electrostatic recording, since the multi-stylus head is in contact with the photoreceptor, if cleaning is insufficient, toner and carrier will be exhausted by the multi-stylus head, resulting in image omission.

[Object and structure of the invention]

The present invention has been made in view of the above, and in order to efficiently and hygienically recover residual toner and carrier on a recording medium without increasing the size of the recording medium and maintain high print quality for a long period of time, it is possible to maintain high printing quality for a long period of time. The purpose of the present invention is to provide a cleaning device that removes residual toner, carrier, etc. on a recording medium by rotating a roller having a resistive layer coated with a dielectric material to which a resistance layer is applied and bringing it into contact with the recording medium.

[Example] Hereinafter, a cleaning device according to the present invention will be described in detail.

FIG. 2 shows an embodiment of the present invention, in which the resistive layer 12 is coated with a resistive layer 12 having a resistance value of 10 to 1010 Ω, and the surface thereof is in rotational contact with the photoreceptor 1 (the rotational direction may be any direction). ), a power supply 13 that generates a DC high IE pressure and applies that voltage (a voltage with the opposite polarity to the potential of the toner, etc.) to the resistance layer 11, and the toner attached to the surface of the roller IO. , and a brush 14 for wiping the entire carrier.

In the above configuration, as shown in FIG.
When the toner and the carrier 15 are charged to the surface and the toner and the carrier 15 are attached to the surface, a DC high voltage (for example, 1 kV) fc of the polarity opposite to the polarity (G) of the toner and the carrier 15 is applied.
By applying the voltage to the resistance layer 11 of the roller 10, the toner and carrier particles 5 on the surface of the photoreceptor are attracted to the surface of the roller 10, and no toner or the like remains on the surface of the photoreceptor 1. Toner and the like adhering to the row 210 are brushed off by the brush 14 and will not adhere to the photoreceptor 1 again.

As shown in FIG. 4, a corotron 16 is installed in front of the installation position of the roller 10, and a positive charge is applied to the corotron 16 by a power source 17, thereby converting the electric charge of the photoreceptor 1 into toner and toner.
It can be set to a positive potential of the same polarity as the carrier, and the cleanability can be further improved.

As described above, by forming the entire roller resistance layer (11q), even if a part of the area between the roller 10 and the photoreceptor 1 is completely destroyed (between the resistance layer 11 and the ground layer of the photoreceptor 1) Even if a short circuit occurs on the photoreceptor, the discharge current can be controlled, so compared to a case where the resistance is very small (for example, when using a metal roller), the photoreceptor l
can suppress disturbances in surface potential. in particular,
As mentioned above, the resistance value of the resistance layer 11 is 104 to 1010.
However, in the case of an electrophotographic copying machine, since the photoreceptor 1 does not have a resistance layer, its resistance value is relatively large, and in the case of a transfer electrostatic recording device, the resistance value is selected within the range of Since it has resistance, its resistance value can be made small. In any case, the discharge 1d current can be limited to a few hundred microamperes to a few milliamperes. In addition, by providing a suitable dielectric layer, surface properties that are normally difficult to obtain with resistive materials alone, such as surface smoothness, coefficient of friction with the photoreceptor, and abrasion, can be added. can do. Additionally, the presence of the dielectric layer allows for a total increase in applied pressure without creating a full path discharge between the dielectric layer surface and the photoreceptor. Even if all-path discharge occurs, the capacitance between the cleaning roller power supply and the photoconductor ground is small due to the presence of the dielectric layer, and the time constant becomes small, so the all-path discharge stops quickly. , it is possible to reduce disturbances in the surface potential of the photoreceptor.

By having the above-mentioned characteristics, it is possible to maintain good reproducibility over a long period of time without completely deteriorating the image in the next process.

FIG. 5 shows a second fruit β1 of the present invention, in which roller 10'f is a roller 10' made of only a resistive material, and a dielectric film is placed between this roller 10' and the photoreceptor 1. 18 (if you ask, polyester film) is interposed,
When cleaning, pull this out through the unwinding section 19,
The dielectric film 18 to which toner or the like has adhered is wound around a winding member 2°.

In addition, in FIG. 6, the roller 1o shown in FIG. 2 is used instead of the roller 10' shown in FIG. This figure shows a third embodiment in which the belt 21 is made of cloth or the like.

Furthermore, FIGS. 7 and 8 show fourth to fifth embodiments of the present invention, and the example in FIG. 7 uses a sponge, cloth, etc. in place of the brush 14 shown in FIG. Collection member 22f
t, contact placement i on row 210! f. In the example shown in FIG. 8, a blade 23 is brought into contact with the row 210 instead of the brush 14 shown in FIG. 2 to remove toner, carrier, etc.

FIG. 9 shows an example in which the cleaning device of the present invention is applied to a full transfer type electrostatic recording device.

FIG. 9 shows an example in which a conventionally used blade cleaner is used as the main cleaner and toner, carrier, etc. that cannot be removed by this cleaner are removed by the cleaning device of the present invention. A recording belt 31 on which a recording medium with a three-layer structure of a base layer, a resistive layer, and a dielectric layer is formed, a multi-stylus head 32 to which a voltage according to recorded information is applied, and a recording belt 31ft: a moving roller. 233a to 33f, a developer 34 that attaches toner to the belt surface according to the formation of surface charges on the recording belt 31 due to the charges applied by the multi-stylus head 32, and the recording belt 31.
A transfer corotron 36 that attaches (transfers) the toner attached to the surface of the recording paper 35 to the recording paper 35, and a pre-clean corotron 37 that applies an electric charge of the same potential as that of the toner to the surface of the recording belt 31 after the transfer is completed. and recording belt 3
a blade cleaner 38 that mechanically removes all the toner and carriers that are in contact with the surface of the recorder belt 31 and adhered thereto; and a precharger that uniformizes the charged state of the surface of the recording belt 31 that is sent to the multi-stylus head 32. Corotron 29
and a cleaning device according to the present invention that completely removes toner remaining on the long surface of the belt without being removed by the cleaning device 1)-38.

In the above configuration, when the apparatus is turned on, the recording belt 31 is driven by the rollers 33a to 33f, the precharge corotron 39, the transfer corotron 36,
A predetermined voltage is applied to each of the pre-cleaner circuit 37 and the resistance layer 11. When a voltage corresponding to recording information is applied to the multi-stylus head 32 in this state, an electrostatic latent image is formed on the surface of the recording belt 210. This electrostatic latent image is developed with toner by a developing device 34 and transferred onto a recording paper 35 by a transfer corotron 36. The transferred toner image is fixed by a fixing device (not shown) to become a recorded image. On the other hand, the recording belt 31 is charged by a pre-clean corotron 37, most of the toner etc. adhering to the belt surface is removed by the blade cleaner 38, and the remaining toner etc. is attracted to the roller 10. Toner adheres to the surface of the roller 10, and no toner or the like remains on the recording belt 31.

In a transfer electrostatic recording device or an electrophotographic device using a multi-stylus head, if cleaning of residual toner and carrier is insufficient, the head surface that contacts the recording medium becomes dirty, resulting in missing images. For this reason, it is required to perform cleaning at a high level compared to ordinary copying machines. However, as shown in Figure 9, by combining the conventional cleaning mechanism and the cleaning device of the present invention, image omissions due to dirt on the multi-stylus head occurred after approximately 10,000 prints. On the other hand, the 9th
According to the 71st paper shown in the figure, no image loss occurred even after about 3 prints.

The example shown in FIG. 9 is a 114 example in which a very high degree of cleaning performance is required, and the present invention described above is suitable for cleaning performance required for ordinary copying machines. Sufficient effects can be obtained by using only the cleaning device included in any of the embodiments.

〔Effect of the invention〕

As explained above, according to the cleaning device of the present invention, the roller comprising the resistive layer and the dielectric layer is brought into contact with the recording medium, and the resistive layer is charged with a heavy charge having a polarity opposite to that of the toner. As a result, residual toner and carrier on the recording medium can be efficiently removed without causing damage to the dog.
Moreover, it can be collected hygienically.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional cleaning device, FIG. 2 is a configuration diagram of a first embodiment of the present invention, FIG. 3 is an explanatory diagram of the charge state of the embodiment of FIG. 2, and FIG. FIG. 2 is a block diagram of a device that improves the performance of the embodiment, FIGS. 5 to 8 are block diagrams of second to fifth embodiments of the present invention, and FIG. FIG. 1 is a configuration diagram showing an example of an electrographic recording device. Explanation of symbols 1... Photoreceptor, 10, 10'... Roller, 11.
... Resistance layer, 12... Dielectric layer, 13.17... Power supply, 14... Blank, 15... Carrier, 16...
Corotron, 18... Dielectric film, 19... Rewinding section, 20... Winding section, 21... Belt,
22...Recovery member, 23...Blade. Figure 1 Figure 2 Figure 4/' Figure 7 Figure 8 Figure 9 Figure 35 35

Claims (1)

[Scope of Claims] A cleaning device that forms recorded information as an electrostatic latent image on a recording medium, develops the electrostatic latent image with toner and transfers it to recording paper, and cleans the surface of the recording medium after the transfer, A roller having a roll-shaped resistance layer having a predetermined resistance value and a dielectric layer coated on the surface of the resistance layer, and which contacts the recording medium directly or via a belt body after transfer, and toner, etc. A cleaning device comprising: a voltage supply means for applying a voltage having a polarity opposite to the polarity of the electric charge to the roller; and a collection means for collecting toner or the like removed from the recording medium by the roller.