JPS639227B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electrostatic recording device for obtaining good recorded images.

FIG. 1 is a conceptual diagram showing the configuration of a general electrostatic recording method. Refer to the same figure. A rotating metal drum 6 is used as a counter electrode, and a pin electrode 2 as a recording electrode is attached to the recording medium 1 wound around the drum.
An electrostatic latent image is formed by applying a signal voltage according to the image to be recorded. The recording medium 1 bearing the latent image reaches the developing section 3 as the drum 6 rotates, where the latent image is made visible by a developer such as toner. The visible image on the recording medium 1 is then transferred to a recording paper (not shown) in the transfer section 4, and the transferred image is fixed to the recording paper by a fixing means (also not shown). On the other hand, after the recording medium 1 wound around the drum 6 passes through the transfer section 4, it is cleaned of residual developer and neutralized by the cleaning and charge removal section 5, and is then transferred again by the pin electrode 2. An electrostatic latent image is formed, and the same process as described above is repeated.

In such a general electrostatic recording method, the recording medium 1 is a recording medium in which a resistance layer made of a conductive resistor is arranged between a recording layer made of a dielectric material and an insulating layer made of an insulator, and After connecting one end of the resistance layer to a constant potential source (for example, ground), between the recording electrode facing the recording layer and the potential source,
The applicant has already proposed an electrostatic recording method in which electrostatic recording is performed on the recording layer by passing a discharge current through the recording layer and a conductive path along the surface of the resistance layer. (Special application 1977-
(See No. 49121).

FIG. 2 is a conceptual diagram showing the configuration of such a previously proposed electrostatic recording method. Refer to the same figure. The recording medium is composed of a recording layer 1a made of a dielectric material, an insulating layer 1c made of an insulator, and a resistance layer 1b made of a conductive resistor placed between them. The pin electrode 2 faces the recording layer 1a with a minute gap of 100 μm or less in contact with it or not. Further, the entire recording medium is supported by a metal drum 6. When one end of the resistive layer 1b is grounded and a pulse voltage is applied to the pin electrode 2 from the pulse voltage source 7, which also has one end set to the ground potential,
A closed circuit is created in which the discharge current flows as shown by the dotted line. That is, a closed circuit is formed from the pulse voltage source 7 back to the pulse voltage source 7 through a conductive path along the surfaces of the pin electrode 2, the recording layer 1a, and the resistive layer 1b. The magnitude of the discharge current in this closed circuit is determined by the resistance layer 1b
It is defined by the surface resistance value of , the impedance of the recording layer 1a, and the impedance of the void.

The previously proposed electrostatic recording method eliminates factors that cause resolution deterioration of recorded images, such as enlargement, blurring, and blurring of electrostatic latent image dots in the recording layer 1a, by changing the surface resistance value of the resistive layer 1b. It has the excellent advantage of being easily removed,
As a specific power supply method of connecting the resistive layer 1b to a constant potential source (for example, ground potential) and supplying power, as shown in FIG. 3, power is supplied using a roller made of a conductive material.

FIG. 3 is a diagram showing an example of a specific power feeding system in the previously proposed electrostatic recording system, in which A is a front view, B is a perspective view of the main part, and C is an enlarged vertical sectional view of part A. . In these figures, 8 is a conductive roller.

As is clear from FIG. 3 B and C, the recording layer 1a
In the recording medium 1 consisting of a resistive layer 1b and an insulating layer 1c, the resistive layer 1b is exposed at both ends, and a conductive roller 8 is brought into contact with the exposed resistive layer 1b and rotated passively to supply power. I am doing it.

Now, in an electrostatic recording device that uses the power feeding method as described above, when a latent image is visualized in a developing section, when a dry toner is used as a developer, etc.
After the transfer process, the developer remaining on the surface of the recording layer is supposed to be removed by the cleaning static eliminator, but there is still some developer (toner or carrier) left on the surface of the recording layer.
The residual developer remained, which had an adverse effect on the formation of the next latent image.In particular, the residual developer adhered to the exposed end of the resistive layer, which is the power feeding section, and as a result, the power feeding effect was not improved.

This invention was made to eliminate the drawbacks of the prior art as described above, and an object of the invention is to provide a static solution that prevents residual developer from remaining on the surface of the recording layer or the end of the resistive layer. The purpose of the present invention is to provide an electronic recording device.

The gist of the present invention is to eliminate residual developer in the previously proposed electrostatic recording system by providing means for constantly cleaning the end of the resistive layer that is in contact with the conductive roller.

Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a diagram showing essential parts of an embodiment of the present invention, in which A is a perspective view and B is a front view. In the figure, numeral 9 indicates a cylindrical cleaning brush, and numeral 10 indicates a cover of the brush. In the perspective view A, the cover 10 is removed for clarity. In the figure, a cylindrical cleaning brush 9 as a constant cleaning means is attached to the recording layer 1 by an appropriate means.
By contacting not only the resistance layer 1b at the end of the drum 6 and following the rotation of the drum 6, it is possible to clean the residual developer that adheres to the drum 6. Further, as shown in the front view B, if the brush 9 is covered with a cover 10, a hole is made in one end of the cover 10, and air is sucked with a vacuum pump (not shown),
Foreign matter such as residual developer can be collected, and the cleaning effect is also great. Furthermore, if a fur brush or the like is used as the cleaning brush 9, although the contact is soft, it will cause abrasion of the resistive layer 1b. good.

FIG. 5 is a perspective view showing essential parts of another embodiment of the invention. This figure shows an embodiment in which a wheel-shaped cleaning brush 11 dedicated to the exposed resistance layer 1b is provided as a constant cleaning means.

FIG. 6 is a front view showing essential parts of still another embodiment of the invention. In the figure, a cylindrical cleaning brush 9 and a wheel-shaped brush 11 are provided in duplicate, and the whole is covered with a cover 10.
An embodiment is shown in which suction of air from holes in the end of the cover is used as a constant cleaning means, further enhancing the cleaning effect.

FIG. 7 is a front view showing the main parts of yet another embodiment of the invention. In the figure, in addition to the main cleaning brush 9, a power supply roller 8 and a cleaning brush 11 are integrated into a unit, and the main cleaning brush 9 is used as a constant cleaning means by sucking foreign matter present in this area. This is because most of the foreign matter is removed by the main cleaning brush 9 and then the foreign matter is suctioned again, so the efficiency of foreign matter removal is high.

As explained above, according to the electrostatic recording device of the present invention, a stable and reliable power supply effect can be expected because foreign matter does not adhere to the power supply section, and therefore the quality of recorded images can be maintained at a good level. There is an advantage.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram showing the configuration of a general electrostatic recording system, Figure 2 is a conceptual diagram showing the configuration of a previously proposed electrostatic recording system, and Figure 3 is a concrete diagram of the previously proposed electrostatic recording system. FIG. 4 is a diagram showing an example of a typical power feeding system, in which A is a front view, B is a perspective view of a main part, C is an enlarged vertical sectional view of part A, and FIG. 4 is a diagram showing a main part of an embodiment of the present invention. , A is a perspective view, B is a front view, FIG. 5 is a perspective view showing a main part of another embodiment of the invention, and FIG. 6 is a front view showing a main part of still another embodiment of the invention. , and FIG. 7 is a front view showing the main parts of yet another embodiment of the present invention. In the figure, 1 is a recording medium, 1a is a recording layer, 1
b is a resistance layer, 1c is an insulating layer, 2 is a pin electrode, 3 is a developing section, 4 is a transfer section, 5 is a cleaning static elimination section,
6 is a metal drum, 7 is a pulse voltage source, 8 is a roller, 9 is a cylindrical cleaning brush, 10 is a cover, and 11 is a wheel-shaped cleaning brush.

Claims (1)

[Claims] 1. In a recording body in which a resistive layer made of a conductive resistor is arranged between a recording layer made of a dielectric material and an insulating layer made of an insulating material, one end of the resistive layer is exposed, and the exposed end portion is Electrostatic recording is performed on the recording layer by supplying power between a conductive roller in contact with the recording layer and a recording electrode facing the recording layer through a minute gap with or without contacting the recording layer. . An electrostatic recording device comprising means for constantly cleaning the exposed end portion of the resistive layer.