JPS6041077A - Cleaning device - Google Patents

Abstract

PURPOSE:To recover efficiently and sanitarily the residual toner and carriers on a recording medium without increasing the size of a cleaning device by allowing a metallic roller impressed with a specific voltage to rotate in contact with the recording medium. CONSTITUTION:When toner and carriers stick to the surface of a photosensitive body 1 which is charged negative electrostatically, the high DC voltage having the (-) polarity opposite to the (+) polarity that the toner and carriers 13 have is impressed to the metallic roller 10 to attract the toner and carriers 13 on the photosensitive body surface to the metallic roller 13, and no toner remains on the surface of the photosensitive body 1. The toner attracted to the roller 10, and the like, are brushed off by a metallic brush 12. In this case, the metallic roller 10 may be rotated in either the same direction with nor the opposite direction to the photosensitive body 1. A corotron 14 impressed with a positive voltage is arranged in front of the metallic roller 10, and the surface of the metallic roller 10 is given 5-10mum ruggedness to further improve 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 brings a metal roller fully applied with a predetermined voltage into contact with a recording medium to remove residual toner, carrier, etc. on the recording medium. The present invention relates to a cleaning device for removing.

[Prior art]

Conventional transfer type electrostatic recording device 1. An example of a cleaning device for a photocopying machine or the like is shown in FIG. This IJ=ing device is installed in contact with the surface of a photoreceptor on which recorded information is formed as an electrostatic latent image and transferred after toner development. A fur brush roll 2 that brushes off the toner on the photoreceptor with the plan of the bristles, a plaque housing 3 that accommodates the fur brush roll 2't, and a flicker bar provided in the brush housing to brush off the toner adhering to the plaque. 4 and 7. A fan 5 which uses an air flow to draw out the toner removed by the ripping bar 4 and the toner attached to the brush out of the brush housing, and a fan 5 attached to the end of the brush housing 3 that removes all the toner attracted by the fan 5. It is made up of a filter bag 6 for storage.

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 into the brush housing 3, and the remaining toner adhering to the brush is removed from the flicker bar 4. be brushed off by All of these toners in the bluff housing 3 are captured by the fan 5 into the filter bag 6. This type of fur brush cleaner provides relatively stable cleaning performance compared to blade cleaners that require lubrication between the photoreceptor and the photoreceptor. (This 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 it is not sanitary because toner etc. scatters, and if brush wiping is insufficient, there is a risk that a film of toner, carrier, etc. may be formed on the surface of the recording medium. There is.

In particular, in transfer recording, the multi-stylus head is in contact with the photoreceptor, so if cleaning is insufficient, toner and carrier will stain 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 it is possible to efficiently remove residual toner and gear from a recording medium without increasing the size of the recording medium.
In order to hygienically collect toner and maintain high print quality over a long period of time, we provide a cleaning device that removes residual toner and carrier on a recording medium by rotating a metal roller to which a predetermined voltage is applied to the recording medium. be.

〔Example〕

Hereinafter, the cleaning device according to the present invention will be explained in detail.

FIG. 2 shows an embodiment of the present invention, in which a photoreceptor (recording medium)
The surface that comes into contact with the l is smooth (5 to 10
A metal row 210 having at least the same length as the width of the photoconductor and attracting toner and carrier on the surface of the photoconductor, a power source 11 capable of obtaining a high DC voltage, and a power source 11.1 A metal brush 12 is provided, which contacts the surface of a metal roller 10 and brushes off toner and carrier 13 on the roller surface while being applied with a voltage of opposite polarity to the potential of the rainbow toner or the like.

In the above configuration, as shown in FIG.
When toner and carrier are attached to a surface charged with
) Polar DC high voltage (e.g. 1,000 V) 1
．． By applying the voltage to the metal roller 10, the toner and carrier 13 on the surface of the photoreceptor are attracted to the metal roller 10, and no toner or the like remains on the surface of the photoreceptor. Toner and the like adhering to the metal roller 10 are brushed off by the metal brush 12.

Note that the rotation direction of the metal roller 10 may be the same direction or the opposite direction to the photoreceptor 1. Furthermore, by arranging the entire corotron 14 to which a positive voltage is applied in front of the installation position of the metal roller 10, as shown in FIG. This can further improve cleanability.

Furthermore, the surface of the metal roller 10 is 5 to 10 μm! By providing the unevenness, gold 1L-40-La 10 and photoreceptor 1
This makes it easier for corona to form between the two and improves cleanability.

FIG. 5 shows a second practical example of the present invention, in which a cleaning member 16 made of sponge, cloth, etc. is arranged instead of the metal brush 12 and brought into contact with the resident roller 10. The toner and carrier attached thereto are removed. The power supply 11 may be connected to the metal roller 10 in any connection form as long as a d-air circuit is formed.

FIG. 6 shows the third embodiment of the present invention, and the fifth embodiment shows the fifth embodiment.
In place of the cleaning member 16 in the figure.

A blade 17 is installed to remove toner and carrier adhering to the surface of the metal roller 10.

Further, FIG. 7 shows a third embodiment of the present invention, in which only a voltage is applied to the metal roller 210 and a porous cloth, plastic film, etc. A cleaning belt 18 is inserted between the cleaning belts 18 and 18, which is pushed out from the rewinding member 19 during cleaning, and the cleaning belt 18 with the toner particles is removed from the rewinding member 20.
It was designed so that it could be rolled up.

FIG. 8 shows an example in which the cleaning device of the present invention is applied to a transfer type electrostatic recording device.

FIG. 8 shows an example in which a conventional fray cleaner is used as the main cleaner, and the toner and carrier that could not be removed by this cleaner are removed by the glue IJ-ning device of the present invention, and the surface of the endless belt is There is a recording belt 21 on which a recording medium having a three-layer structure of a pace layer, a resistive layer, and a dielectric layer is formed. a multi-stylus head 22 to which a voltage according to 5 is applied, and rollers 23a to 23f that move the recording body bell) 21;
A developing device 24 attaches toner to the surface of the recording belt 21 according to the formation of surface charges on the surface of the recording belt 21 due to charges applied by the multi-stylus head 22; A transfer corotron 26 that attaches (transfers) to the recording medium heald 25, a pre-clean corotron 27 that applies a charge of the same potential as that of the toner, etc. to the surface of the recording medium belt 210 after the transfer is completed, and a pre-clean corotron 27 that contacts the surface of the recording medium heald 21. A blade cleaner 2 mechanically removes toner and dirt adhering to the surface.
8, a cleaning device according to the present invention that adheres toner and carrier remaining on the belt surface without being removed by the blade cleaner 28, and a cleaning device that uniformizes the charging state of the surface of the recording belt 210 sent to the multi-stylus head 22. It consists of a precharge corotron 29.

In the above configuration, when the apparatus is turned on, the recording belt 21 is driven by the rollers 23aN23f, the precharge corotron 29, the transfer protron 26, the precleaner clean corotron 27, and the metal brush 1.
A predetermined voltage is applied to each of 2. When a voltage corresponding to recording information is applied to the multi-stylus head 22 in this state, an electrostatic latent image is formed on the surface of the recording belt 21. This electrostatic latent image is developed with toner by a developing device 24 and transferred onto a recording paper 25 by a transfer corotron 26. The transferred toner image is fixed by a fixing device (not shown) to become a recorded image.

On the other hand, the recording belt 21 is connected to the pre-clean corotron 2.
Most of the toner, etc. that adheres to the belt surface is removed by the blade cleaner 28, and the remaining toner, etc. adheres to the metal roller 10 due to the opposite polarity potential, and the toner, etc. that adheres to the belt surface is removed from the recording body (belt) 21. will not remain.

In an apparatus using a multi-stylus head, if cleaning of residual toner and carrier is insufficient, the head that comes into contact with the recording medium will become dirty, causing defects in the image. For this reason, a high level of cleaning is required compared to ordinary copying machines. However, as shown in Figure 418,
By combining the conventional cleaning method (I\) with the cleaning device of the present invention, one image was missing due to dirt on the multi-stylus head after printing approximately 10,000 sheets. According to the configuration shown in FIG. 8, no image omission occurred even after about 30,000 copies were printed.

The example shown in Fig. 8 is an example of the groove formation when a very high level of cleaning performance is required.
Even if the entire cleaning device with the 11 components shown in FIG. 7 is used alone, a sufficient effect can be obtained.

〔Effect of the invention〕

As explained above, according to the cleaning ↓ placement method of the present invention, a metal roller to which a charge of opposite polarity to the Id load of toner or the like is applied is brought into contact with the medium, and this metal roller 2
Since the surface of the recording medium is cleaned, residual toner and carrier on the recording medium can be efficiently and hygienically collected without increasing the size of the recording medium.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional cleaning device, Fig. 2 is a diagram showing the 11 components of the first embodiment of the present invention, Fig. 3 is an explanatory diagram of electric charges in the embodiment of Fig. 5 to 7 are configuration diagrams of the second to fourth embodiments of the present invention, and FIG. 8 is a transfer type electrostatic device to which the present invention is applied. FIG. 2 is a configuration diagram of a recording device. Explanation of symbols 1... Photoreceptor, lO... Metal p-ra, 11°15
... Power source, 12... Metal brush, 14... Corotron, 16... Cleaning member, 17... 7'v-do, 1
8... Cleaning belt, 19... Rewinding member, 20... Winding member. Figure 1 Figure 2 Figure 5 Figure 8

Claims (1)

[Scope of Claims] A cleaning device that forms recording 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 metal roller that contacts the recording medium directly or via a belt member after completion of transfer; a voltage supply means that applies a voltage to the metal roller with a polarity opposite to the polarity of the charge that the toner or the like has; A cleaning device comprising: a collection means for collecting all of the toner and the like removed from the recording medium.