JPS61134769A - Electrostatic recording device - Google Patents

Abstract

PURPOSE:To prevent a nontransferred toner from accumulating on the rough surface of a recording belt by arranging a plate magnet opposite to said belt apart at a prescribed interval near the position of a conductive roller to be separated from the belt and attracting the scattering nontransferred toner to this magnet. CONSTITUTION:The toner 19 of the recording belt 3 is transferred to a recording paper 12 by using a transfer roller 13, at that time, an electrostatic charge 20 of a latent image remaining on the recesses on the insulating belt 3 without leaking to the conductive roller 9 and charge 21 induced on the surface of the roller 9 with this charge 20 cause peeling discharge when the insulating belt 3 is separated from the conductive roller 9, and disturbance of an electric field near the position C of the roller 9, resulting in scattering of the nontransferred toner 19A. This toner 19A is attracted to the permanent plate magnet 31 of the electrostatic recording device, thus permitting accumulation of the untransferred toner on the rough surface of the recording belt 3 to be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an image recording device used as an output device for facsimile machines and printers, and particularly relates to an image recording device that connects a recording electrode and a magnetic toner developer via an insulating recording material. In an electrostatic recording device that forms a toner image on an insulating recording medium at the same time as an image signal is applied, this method prevents the uneven surface of the recording medium from being contaminated by scattered toner among untransferred toner. The present invention relates to a prevented electrostatic recording device.

[Conventional technology]

In recent years, in contrast to recording methods in which the latent image forming process and the developing process are separated, a direct recording method has been proposed in which these processes are performed simultaneously. The magnetic toner is brought close to the recording medium on the opposite side of the recording medium that the recording medium electrode needle is in contact with, and a voltage corresponding to the image signal is applied between the recording electrode needle and the sleeve of the developing machine to inject toner particles onto the recording medium. One of the inventors of the present invention has already proposed a recording apparatus that deposits toner particles and transfers the toner particles onto recording paper in Japanese Patent Application Laid-Open No. 57-105758 and other publications.

FIG. 2 is a perspective view showing the structure of the recording section of such an electrostatic recording device. As shown in the figure, the recording electrode 1 has a multi-stylus structure in which multiple groups of electrode needles 2 are arranged in a row. . A recording body 3 made of a dielectric film is placed in contact with the recording electrode 1. On the other hand, a magnetic toner developing device 6 having a rotating magnetic roller 5 is installed inside the fixed cylindrical sleeve 4 at a position facing the recording electrode 1 with the insulating recording body 3 interposed therebetween. Further, on the cylindrical sleeve 4, a counter electrode 7 divided into a plurality of segments is arranged in close contact with each other.

To perform recording using such a recording section, magnetic toner is transferred to the outer circumference of the cylindrical sleeve, a voltage corresponding to the image signal is applied to the electrode needle 2, and a voltage of opposite polarity is applied to the counter electrode 7. By selectively applying a voltage, magnetic toner is attached to the insulating recording medium 3 to form a toner image.

FIG. 3 shows an enlarged view of how magnetic toner is attached to the insulating recording medium 3 and a toner image 19 is formed while a voltage is applied to the electrode needle 2. Numbers 2, 3, 4 in the diagram
, 5.7 correspond to FIG. While the insulating recording body 3 is moving in the direction shown by the arrow in the figure, when voltage pulses of opposite polarity are applied to the electrode needle 2 and the counter electrode 7, the electrode needle 2 and the insulating recording body 3 An air discharge occurs in the minute gap, and a latent image charge 20 is formed on the surface of the two electrode needles of the insulating recording body 3. At the same time, charges of opposite polarity are injected into the toner 18 at the tip of the magnetic brush that has been conveyed onto the selected segment-shaped counter electrode 7, and the electrode needle 2
latent image charge 20 on the insulating recording medium 3 on the side where
1, a toner image 19 is formed on the insulating recording medium 3 of the seven opposing electrodes.

Incidentally, an uneven layer having a predetermined height is formed on the surface of the two examples of electrode needles of the insulating recording body 3 in order to maintain the minute voids necessary to generate an aerial discharge.

FIG. 4 is a diagram showing the overall structure of such an electrostatic recording apparatus, and the reference numbers 1, 3.4, and 6.7 in the figure correspond to those in FIG. 1. The insulating recording material 3 is made of a dielectric film in the form of a belt and rotated at a constant speed by rollers 8, 9, and 10.

The tip of the recording electrode 1 is placed in contact with the inside of the insulating recording body 3. Further, a magnetic toner developing device 6 having a counter electrode 7 on the surface of the cylindrical sleeve 4 is installed opposite the recording electrode 1.

As explained with reference to FIGS. 2 and 3, after forming a toner image on the insulating recording medium 3, the insulating recording medium 3 is rotated and the recording paper 12 is placed on the grounded roller 9. It is conveyed parallel to the insulating recording medium 3, and the toner image is transferred onto the recording paper 12 from the back side using the transfer roller 13. After that, recording paper 1
The transferred image on 2 is fixed to the recording IE 12 by a fixing device 14. On the other hand, the insulating recording body 3 is further rotated, and alternating voltages having different phases are applied to each corona at a portion where the corona static eliminators 16 and 17 are placed opposite each other on both surfaces of the third insulating recording body. When applied to an electric appliance, the charge of the magnetic toner remaining on the insulating recording medium 3 is erased, and the force with which the magnetic toner adheres to the insulating recording medium 3 is weakened.

When the insulating recording medium 3 is further rotated and conveyed to the recording section, the remaining magnetic toner is collected by the magnetic force of the magnetic roller 5 in the magnetic toner developing device 6.

The recording process is repeated in this way to output an image, and since such a recording device simultaneously performs the latent image formation process using the recording electrode and the development process using the developing machine, As an output device, the device has the advantage of being simple in configuration, small in size, and low in price. Additionally, by using magnetic toner, untransferred toner can be collected in the developing machine and reused without cleaning, which has the advantage of making equipment maintenance easier and reducing the cost of consumables such as toner. .

[Problem that the invention seeks to solve]

The state of a toner image when recording using such an electrostatic recording device will be explained with reference to FIG.

The toner image 19 at the position in the figure is in the state after development, and the latent image charge 20 and toner @! It is stable and balanced with the charge of 19. Next, at position B, the toner image 19 is
The toner image 19 is transferred onto the recording paper 12 by applying a charge opposite to that of the toner image 19 to the recording IE 12 using the transfer roller 13 .

However, at this time, the latent image charge 20 is leaked to the conductive roller 9 due to the gap between the concave portion of the uneven surface provided on the surface of the recording medium 3 and the grounded conductive roller 9. It remains as it is. Therefore, a charge 21 having a polarity opposite to that of the latent image charge 20 is induced on the surface of the conductive roller 9.

When the recording medium 3 reaches the position C where it separates from the conductive roller 9 in this state, a peeling discharge occurs between the latent image charge 20 and the induced charge 21, and the disturbance of the electric field caused by the peeling discharge at this time causes the transfer. Very small amount of toner 1 to unfinished toner 19
9A scatters, and this scattered fine toner 19A floats in the air, enters the inside of the recording medium transport system, and is transferred to the recording medium 3.
It goes around and adheres to the uneven surface of the
This adhered toner accumulates and contaminates the uneven surface of the recording medium 3. For this reason, leakage occurs between adjacent styli, which are formed by a set of electrode needles. This leak melts the molding material that fixes the stylus, exposing the stylus.As a result, the withstand voltage between adjacent styli decreases, and when a voltage is applied to one stylus during recording, the adjacent stylus This has the disadvantage that it becomes conductive, making accurate pin selection impossible and damaging the stylus electrode.

[Means for solving problems]

The above problem is solved by the fact that the recording electrode and the magnetic toner developing machine are disposed facing each other with an insulating recording medium interposed between them, and on the sleeve containing the magnetic roller of the magnetic toner developing machine, a plurality of segments are arranged opposite to the recording electrode. Divided into 8g''41''l''m
``''leM';a h゛kE;2n'W114 =
! = iE After forming a toner image on the insulating recording medium by selectively applying a voltage between the opposing electrodes, the toner image is transferred to recording paper, and the remaining magnetism on the insulating recording medium is transferred. In a recording device that performs repeated recording while removing the electric charge of the toner and collecting the remaining magnetic toner by the magnetic force of the magnetic toner developing machine, the recording medium is installed opposite to a transfer roller that transfers the image onto the recording paper. At the position where the conductive roller that conveys the recording material separates from the recording material,
According to the electrostatic recording device of the present invention, a member having magnetic force is installed opposite to the recording medium while maintaining a predetermined gap, and the toner remaining on the recording medium is attached to the member and removed. resolved.

[Effect]

That is, in the electrostatic recording device of the present invention, an electroconductive roller that is disposed opposite to the transfer roller, conveys the recording medium, and is at ground potential, and near the position where the recording medium is separated from the conductive roller.
A plate-shaped magnet is placed facing the recording medium at a predetermined distance, and the magnet attracts and removes the scattered toner that has not been transferred, so that the untransferred toner is removed from the uneven surface of the recording medium. This is to prevent it from being accumulated.

〔Example〕

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

FIG. 1 is a schematic diagram of the electrostatic recording device of the present invention, and as shown in the figure, the insulating recording material 3 is separated from the conductive roller 9 at a position C.
Near the recording body 3, at an interval of 1 to 2 (to),
The width is approximately 1 cffI at the position facing the insulating recording body 3.
A plate-shaped permanent magnet 31 having a length of approximately 10 CII+ is installed using a suitable jig.

In such a recording apparatus, as described above, when the toner 19 of the recording medium 3 is transferred onto the recording paper 12 using the transfer roller 13, the toner 19 is not leaked to the conductive roller 9 and is transferred to the concave portion of the insulating recording medium 3. The residual latent image charge 20 and the induced charge 21 induced on the surface of the conductive roller 9 by the latent image charge 20 are the same as the induced charge 21 and the latent charge 21 when the insulating recording medium 3 is separated from the conductive roller 9. Due to the separation discharge between the image charge 20 and the conductive roller 9, the electric field is disturbed in the vicinity of the conductive roller 9 wC, and the untransferred toner 198 is scattered.

The scattered untransferred toner 198 can be attracted by the permanent magnet 31 of the electrostatic recording device of the present invention.

Therefore, there is no phenomenon in which untransferred toner is deposited on the uneven surface of the recording medium 3, and there is no reduction in surface resistance on the uneven surface of the recording medium, so leakage accidents between adjacent squirrels of the recording electrode can be prevented. , a highly reliable electrostatic recording device can be obtained.

〔Effect of the invention〕

As described above, according to the electrostatic recording device of the present invention, untransferred and scattered toner can be collected and removed with a simple structure.
This scattered toner hits the uneven surface of the recording medium! ! It is possible to eliminate the phenomenon of I, and to prevent damage to the recording electrode due to contamination of the uneven surface, thereby making it possible to obtain a highly reliable electrostatic recording device.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the main parts of the electrostatic recording device of the present invention, FIG. 2 is a perspective view showing the recording section of the electrostatic recording device, and FIG. 3 is a schematic diagram showing a toner image in the electrostatic recording device. FIG. 4 is a schematic diagram showing the configuration of an electrostatic recording device, and FIG. 5 is a schematic diagram showing an inconvenient state in a conventional device. In the figure, 3 is an insulating recording body, 9 is a conductive roller, 1
2 is a recording paper, 13 is a transfer roller, 19.198 is a toner image, 20 is a latent image charge, 21 is an induced charge, and 31 is a permanent magnet. Figure 3 Figure 4 Figure 5 IJ F

Claims (1)

[Claims] A recording electrode and a magnetic toner developing device are disposed facing each other via an insulating recording material, and a counter electrode divided into a plurality of segments is provided on a sleeve containing a magnetic roller of the magnetic toner developing device, facing the recording electrode. is arranged, and after selectively applying a voltage between the recording electrode and the counter electrode to form a toner image on the insulating recording medium, the toner image is transferred to the recording paper, and the insulating In a recording device that repeatedly performs recording while removing the electric charge of the magnetic toner remaining on the recording medium and collecting the remaining magnetic toner by the magnetic force of the magnetic toner developing machine, a transfer roller that transfers the toner image onto the recording paper is used. A member having magnetic force is installed facing the recording body while maintaining a predetermined gap at a position where the recording body separates from a conductive roller that is installed to face the recording body and conveys the recording body. An electrostatic recording device characterized in that among the remaining toner, scattered toner is attached to the member and removed.