JPS5885471A - Electrostatic recording device - Google Patents

Abstract

PURPOSE:To attain easily dimensions of a clearance, by providing an insulating interposition, which are brought into contact with a multineedle electrode and a recording medium where picture information converted to an electric signal is recorded by static electrocity, in the gap between these recording medium and the multineedle electrode to prevent a toner from being brought into contact with the multineedle electrode directly. CONSTITUTION:A recording medium 10 on a drum 11 consists of a dielectric layer and a conductor layer. A multineedle electrode 12 consisting of 8 needles per 1mm. is so attached that the clearance between this electrode 12 and the recording medium 10 has a length (d). An insulating interposition 13 having the thickness (d) which is inserted to the clearance between the recording medium 10 and the multineedle electrode 12 consists of plastic. Since a residual toner H is prevented from being brought directly into contact with the multineedle electrode 12 because of insertion of this interposition 13, this electrode 12 is protected from the residual toner, and the number of recordings which the electrode 12 can endure is increased.

Description

[Detailed description of the invention] This invention relates to electronic recording devices.

A cleaning method in a conventional electrostatic recording apparatus will be explained with reference to FIGS. 1 and 2.

Figure 1 shows the overall configuration of an electrostatic recording image transfer system in which recording, development, transfer, and cleaning of residual toner are performed in one cycle. This multi-needle electrode 2 is used for recording.
As a result, an electrostatic latent image is recorded on the recording medium 1.

The toner having the opposite polarity to the electrostatic potential of the recorded electrostatic latent image is distributed onto the electrostatic latent image by the developing device 3 and visualized, and then a voltage having the opposite polarity to the potential of the toner is applied to the recording paper 4. The toner image is transferred onto the recording paper 4 by being applied by the charger 5 with the electrification interposed therebetween.

The residual toner remaining without being transferred is removed by a cleaning device such as a mag roll 6 or a blade 7.
The fc residual toner that cannot be completely removed is deposited within the discharge gap distance between the recording medium 1 and the multi-needle electrode 2 of several tens of micrometers.

Due to the influence of this toner, the needle electrodes may be short-circuited, resulting in image omission, or the recording medium 1 or the multi-needle electrode 2 may be damaged.

FIG. 2 shows a cleaning device in which a web cleaner 8 is installed after the mag roll 6 in an electrostatic recording image transfer method in order to increase cleaning efficiency for residual toner, reduce staining of the multi-needle electrode 2, and increase the number of sheets that can be recorded. The structure is as follows. 9 indicates a static eliminator. However, even with this configuration, it is impossible to completely remove residual toner, so
There are drawbacks such as image dropouts and damage to the electrodes and drum.

In addition, the conventional mechanism for maintaining the clearance between the multi-needle electrode 2 and the recording medium 1 requires positional accuracy of several microns due to the relationship between the gap distance and the discharge starting voltage, resulting in a highly rigid and refined structure. There are drawbacks.

The purpose of the present invention is to prevent toner from directly contacting a multi-needle electrode in a method for electrostatic recording on plain paper, even if the residual toner cleaning effect is not perfect, and to easily maintain clearance dimensions with high precision. An object of the present invention is to provide an electrostatic recording device that can always obtain clear images.

The features of the present invention include a recording medium on which image information converted to an electric signal is recorded by electrostatic electricity, a multi-needle electrode that records image information as an electrostatic latent image on the recording medium, and an action of electrostatic electricity. a developing device that attaches toner to the electrostatic latent image, a charger that transfers the toner image on the recording medium to paper, and a static eliminator that weakens the electrostatic bonding force between the toner and the recording medium;
In an electrostatic recording device equipped with a cleaning device for removing residual toner whose bonding force with a recording medium has decreased.

An insulating inclusion is provided in the gap between the recording medium and the multi-needle electrode, and this inclusion is brought into contact with both the recording medium and the multi-needle electrode.

Hereinafter, an embodiment of the electrostatic recording apparatus of the present invention will be explained with reference to FIG.

An electrostatic recording medium 10 is wound around the surface of a rotatable drum 11 and is composed of a dielectric layer and a conductive layer. 12 records image information using static electricity, so 1
It is a multi-needle electrode consisting of eight needle electrodes per unit, and is installed so that the clearance with the recording medium 10 is d.This multi-needle electrode 12 forms an electrostatic latent image on the recording medium 10. Record. Reference numeral 13 denotes an insulating inclusion having a thickness d inserted into the clearance between the recording medium 10 and the multi-needle electrode 12, and is made of plastic, for example. If the inclusion 13 is inserted between the recording medium 10 and the multi-needle electrode 12 in this way, the residual toner H will not directly touch the multi-needle electrode 12, and the multi-needle electrode 12 will be protected from the residual toner. As a result, the number of sheets that can be recorded can be increased. residual toner H
At first, as shown in FIG. 4(a), the particles scatter on the inclusions 13, but as -m increases, they accumulate and are compacted, as shown in FIG. 4(b). A composition with functions equivalent to a high-strength blade can be created. In this way, the recording surface is protected from residual toner H.

Figure 5 shows an example in which an insulating film 13' is used as an insulating inclusion.
By feeding the film 3' in the opposite direction to the moving direction of the recording medium 10, toner accumulated between the film 13' and the recording medium 10 can be removed.

Next, an example of a driving method for feeding the insulating film 13' will be explained with reference to FIG.

An insulating film 13' whose one end is wound around the driven shaft 14
The other end is attached to a drive shaft 15 and wound up by a drive motor 16 in synchronization with, for example, a drum. At this time, the frictional force between the insulating film 13' and the recording medium 10 becomes dynamic friction, so that the driving force of the drive motor 16 is small and the thin insulating film 13C can be easily fed.

The operation of the present invention will be explained with reference to FIG.

The recording paper 17 is fed by a paper feed roller 18 that rotates in synchronization with the drum 11. On the other hand, toner is removed from the surface of the drum 11 by a static eliminator 19 and a cleaning device 20, and an electrostatic latent image is recorded thereon by a multi-needle electrode 12. Multi-needle electrode 12
By providing an insulating inclusion 13 in the clearance between the recording medium 10 and the recording medium 10, the multi-needle electrode 12 is protected, and by pressing the multi-needle electrode 12, it has the role of adjusting the clearance. Next, a developer 21 causes toner to adhere to the electrostatic latent image. The toner is transferred to the recording medium 10 by the charger 22.
The image is transferred from the recording paper 17 to the recording paper 17.

According to this embodiment, there is an effect that a clear image can always be seen even when perfect leaning is not possible.

According to the present invention, since the influence of residual toner on the multi-needle electrode can be completely prevented, clear images can always be obtained.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing the overall configuration of a conventional electrostatic recording device, and FIG. 3 is a schematic diagram showing the overall structure of a conventional electrostatic recording device. W, an enlarged view of an embodiment of the main part of the recording device, FIG. 4(a), (
b) is an explanatory diagram of the state of adhesion of residual toner in the apparatus of the present invention, FIG. 5 is an enlarged view of another embodiment of the main part of the electrostatic recording apparatus of the present invention, and FIG. 6 is an illustration of the state of adhesion of residual toner in the apparatus of the present invention. FIG. 7 is a perspective view showing an example of the film driving method in FIG. DESCRIPTION OF SYMBOLS 10... Recording medium, 11... Drum, 12... Multi-needle electrode, 13... Inclusion.・ ゛ ・'Shoes foil Figure 2 Figure 6 Figure 10 to Figure 7

Claims (1)

[Scope of Claims] 1. A recording medium on which image information converted into an electric signal is recorded by electrostatic electricity, a multi-needle electrode that records the image information as an electrostatic latent image on the recording medium, and a toner that is produced by the action of electrostatic electricity. A developing device that attaches toner to the electrostatic latent image, a charger that transfers the toner image on the recording medium to paper, a static eliminator that weakens the electrostatic bond between the toner and the recording medium, and a static remover that weakens the bonding force between the toner and the recording medium. In an electrostatic recording device equipped with a cleaning device for removing residual toner, an insulating inclusion is provided in the gap between the recording medium and the multi-needle electrode, and this inclusion is removed between the recording medium and the multi-needle electrode. An electrostatic recording device characterized in that both are brought into contact with each other. 2. The electrostatic recording device according to claim 1, wherein the insulating inclusion is made of plastic. 3. The electrostatic recording device according to claim 1, wherein the insulating inclusion is made of a film. 4. The electrostatic recording device according to claim 3, wherein the insulating film is fed out by a feeding section and wound up by a winding section. 5. The electrostatic recording device according to claim 4, wherein the direction in which the insulating film is fed out is opposite to the direction in which the recording medium moves.