JPS61210380A - Electrostatic recording method - Google Patents

Abstract

PURPOSE:To prevent the degradation in image quality due to toner remaining on the surface of a latent image carrier by not sticking the toner to the latent image carrier to which discharge is performed from a recording electrode. CONSTITUTION:A latent image carrier 3 is moved circularly in directions of arrows (a) and (b) by rotation of a main roll 1 and a slave roll 2, and a dielectric film 8 is moved circularly in directions of arrows (c), (d), and (e) by rotation of the main roll 1 and slave rolls 6 and 7. An electrostatic latent image formed on the latent image carrier 3 by discharge of a recording electrode 4 is carried onto the main roll 1 by movement of the latent image carrier 3, and the dielectric film 8 is put on it. Electrostatic induction is caused in the dielectric film 8 by the latent image electric charge on the front face side of the latent image carrier 3, and the electric charge having the same polarity is made on the front face side of the dielectric film 8, and the toner from a developing device 9 is stuck to the transferred electrostatic latent image on the dielectric film 8 to form a toner image, and the toner image is transferred onto a recording paper 14 by a transfer device 10, and the transferred image is fixed on the recording paper 14 by a fixing device 11.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to an electrostatic recording method.

[Technical background of the invention and its problems 3 One of the methods for recording image information is an electrostatic recording method. Fourth
The figure is a conceptual side view of a recording apparatus employing this electrostatic recording method, in which a belt-shaped latent image carrier A is wound around a plurality of rollers B spaced apart from each other. When the recording apparatus starts operating, an electrostatic latent image is formed on the latent image carrier A by discharge of the recording electrode C provided close to the surface of the latent image carrier A. This electrostatic latent image is carried to a developing device by the movement of the latent image carrier A, where toner adheres to the electrostatic latent image due to the electrostatic attraction force of the electrostatic latent image to form a toner image. This toner image is further carried to the transfer device E by the movement of the latent image carrier A, and is superimposed on the recording paper F here, and the toner image is transferred to the recording paper F by the action of the transfer device E. . Next, the recording paper F is conveyed in the direction of arrow G, and after the transferred image is fixed by a fixing roller H, it is discharged outside the machine. On the other hand, the electrostatic latent image remaining on the latent image carrier A is erased by a static eliminator, and after the toner remaining on the surface is removed by a toner cleaner J, it is moved and ready for the next recording operation. Be prepared.

By the way, as described above, the recording electrode C is arranged close to the surface of the latent image carrier A. On the surface of this latent image carrier A,
In order to always obtain a stable electrostatic latent image, there should be a very small gap between the surface of the latent image carrier A and the recording electrode C, for example 8.
It is necessary to maintain a gap of approximately μm at all times. On the other hand, completely removing the toner remaining on the surface of the latent image carrier A after the toner image has been transferred to the recording paper is as follows:
Even if the above-mentioned static eliminator or toner cleaner is used, it is extremely difficult to apply pressure, and as a result, the residual toner makes it impossible to secure an appropriate distance between the surface of the latent image carrier A and the recording electrode C, and the electrostatic latent image is damaged. This has caused problems such as disturbances and a deterioration in image quality.

[Purpose of the invention]

In view of the above circumstances, it is an object of the present invention to prevent as much as possible the deterioration of image quality caused by residual toner.

[Summary of the invention]

Therefore, in the present invention, an electrostatic latent image formed on a latent image carrier is replicated on the surface of a dielectric film that is brought into close contact with the latent image carrier by electrostatic induction, and the latent image of this dielectric film is The above object is achieved by developing the toner, transferring and fixing it to obtain a recorded image, and preventing toner from adhering to the latent image carrier where direct discharge is performed.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on the drawings showing one embodiment.

FIG. 1 is a conceptual side view showing an example in which the electrostatic recording method according to the present invention is applied to a recording apparatus.

A main roller 1 and a follower roller 2 are disposed facing each other in the center of the figure, and a belt-shaped latent image carrier 3 is disposed at both ends 21 and 2.
Further, a recording electrode 4 is installed on the right side of the follower roller 2 in the figure with a slight distance from the surface of the latent image carrier 3. Further, a latent image carrier static eliminator 5 is disposed below the latent image carrier 3. On the other hand, on the right side of the figure, there is a pair of follower rows 26, 7 separated vertically.
are arranged, and a dielectric film 8 is wrapped around these slave rollers 6.7 and the above-mentioned main roller 1. At this time, as mentioned above, the main roller 1 has the latent image carrier 3.
Since the latent image carrier 3 and the dielectric film 8 are already wrapped around each other, the latent image carrier 3 and the dielectric film 8 are in close contact with each other on the main roller 1, especially on the left half circumference of the main row 21, as is clear from the figure. Further, a developing device 9 is disposed at the upper left portion of the main roller 1, and the latent image carrier 3 and the dielectric film 8 are in close contact with each other on the main roller 1 corresponding to the developing device 9.

Furthermore, a transfer device 10 is disposed at the lower left portion of the main roller 1, and like the developing device 9 described above, the latent image carrier 3 and the dielectric film 8 are disposed on the main row 21 corresponding to the transfer device 10. It's in close contact. On the other hand, on the right side of the transfer device 10, a fixing device 11 consisting of a pair of rollers 11a, 1it) is provided, and below a dielectric film 8 stretched between a main roller l and a subordinate roller 7, a fixing device 11 is provided. , a dielectric film static eliminator 12 is installed close to the dielectric film 8, and a toner cleaner 13 is installed to the right of the static eliminator 12, also close to the dielectric film 8. There is.

In the above configuration, when the recording apparatus starts operating, the main row 21. The rotation of the follower roller 22 causes the latent image carrier 3 to circulate in the directions shown by arrows a and b, and the rotation of the main roller 1 and follower rollers 6.7 also causes the dielectric film 8 to move in the directions shown by arrows c, d, and e. Move circularly in the direction shown. At this time, the moving speeds of the latent image carrier 3 and the dielectric film 8 are set at the same speed so that both 3 and 8 do not shift relative to each other on the main roller 1. On the other hand, on the latent image carrier 3,
An electrostatic latent image is formed based on the image signal by the discharge of the recording electrode 4, and this electrostatic latent image is carried to a portion on the main row 21 corresponding to the developing device 9 by the movement of the latent image carrier 3. As described above, the dielectric film 8 is superimposed on the latent image carrier 3. FIG. 2 is an enlarged view of this state, and as is clear from the figure, the latent image carrier 3
As a result of electrostatic induction occurring within the dielectric film 8 due to the latent image charges formed on the surface side, charges of the same polarity as the latent image charges formed on the latent image carrier 3 are transferred to the dielectric film 8.
Therefore, the electrostatic latent image on the latent image carrier 3 is transferred onto the dielectric film 8. Here, toner supplied from the developing device 9 adheres to the electrostatic latent image on the dielectric film 8 due to the electrostatic attraction force of the electrostatic latent image, forming a toner image. This toner image is carried by the movement of the dielectric film 8 to a position on the main roller 1 corresponding to the transfer device 10, and is also transferred by the transfer device 10 onto the recording paper 14 conveyed from a paper feeding device (not shown). Ru. Next, the recording paper 14 is peeled off from the dielectric film 8 and conveyed in the direction of the arrow f, and after the transferred image is fixed on the recording paper 14 by the fixing device 11, the recording paper 14 is ejected into the packaging. be done. On the other hand, after the recording paper 14 has been peeled off, the dielectric film 8 is separated from the latent image carrier 3 and moved in the direction of arrow e, and the dielectric film static eliminator 1
2, and then the remaining toner is removed by a toner cleaner 13, in preparation for the next recording. Further, the latent image carrier 3 moves in the direction indicated by the arrow, and after being neutralized by the latent image carrier static eliminator 5, it prepares for the next recording. At this time, as is clear from the above description, since toner does not come into direct contact with the latent image carrier 3, no toner cleaner is provided for the latent image carrier 3.

In this example, after the transfer process is completed, the electrostatic latent image remaining on the latent image carrier 3 is erased by the static eliminator 5 for the latent image carrier, and the next recording is started. The latent image carrier 3 is circulated in the direction of arrow a while the electrostatic latent image remains without operating the carrier static eliminator 5 and the recording electrode 4, and the image is formed by the above-mentioned processing steps. You can also get it. In this way, a plurality of copy images can be obtained by forming an electrostatic latent image once on the latent image carrier 3, which greatly contributes to speeding up image information processing. Further, in another embodiment shown in FIG.
According to this configuration, the object of the present invention can be effectively achieved while downsizing the overall configuration. In FIG. 3, components having the same functions as those shown in FIG. 1 are given the same reference numerals. Furthermore, the present invention can also be effectively applied to a copying machine in which the latent image carrier 3 or 100 is constituted by a photoconductive photoreceptor, and an optical image of a calligraphic image is exposed to light on the photoreceptor to form an electrostatic latent image. It goes without saying that it can be done.

〔Effect of the invention〕

As described in detail above, according to the electrostatic recording method of the present invention, toner as a developer does not adhere to the latent image bearing member where discharge from the recording electrode etc. is performed, and thus the latent image bearing member Deterioration in image quality due to toner remaining on the surface can be prevented as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a conceptual side view showing an example in which the electrostatic recording method according to the present invention is applied to a recording device, and FIG. 2 is a partially enlarged view of a latent image carrier and a dielectric film showing an electrostatic induction effect. 3 are conceptual side views showing other embodiments, and FIG. 4 is a conceptual side view of a recording apparatus employing a conventional electrostatic recording method. 3...Latent image carrier, 8...Dielectric film. Figure 2

Claims (1)

[Claims] An electrostatic latent image is formed on a latent image carrier, a dielectric film is brought into close contact with this electrostatic latent image, the electrostatic latent image is replicated on the surface of the dielectric film by electrostatic induction, and this replicated latent image is An electrostatic recording method characterized by developing an electrostatic latent image.