JPS59192586A - Electrophotographic recorder - Google Patents

Abstract

PURPOSE:To obtain a serial printer type electrophotographic recorder which is small and in which an ordinary paper can be used, by using an electrophotographic process for a serial printer. CONSTITUTION:On a photo-conductive material layer 6 electrically charged by a conductive brush 13 of a printer 2, a latent image is formed by a latent image forming device 8. At the time of development, an electric field is generated for the latent image on a photosensitive drum 7 by a developing bias voltage impressed on a magnetic brush 9a, and positive charges are injected into a magnetic toner through a low-resistance magnetic toner of a mixed one-component developer comprising a low-resistance magnetic toner and a high-resistance magnetic toner, whereby a dense printed image can be obtained. When transferring, a negative voltage is impressed on a conductive rubber blade 3 provided on the back side of a recording paper 1, whereby the magnetic toner is transferred from the surface of the drum 7 onto the recording paper 1 by the function of the high-resistance magnetic toner electrically charged in positive polarity, and the resultant image is fixed over the entire width of the paper by a fixing roller 4. The printer 2 is moved in a direction perpendicular to the feeding direction of the recording paper 1 to scan the paper 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an electrophotographic recording apparatus that forms an electrostatic latent image on a recording drum, develops it, and transfers it onto recording paper.

(2) Background of the technology Wire dot printers have been the mainstream serial printer that prints one character at a time on paper, but as the speed of printing increases, noise problems arise. In recent years, thermal printers and inkjet printers using a heat-sensitive recording method have been developed. However, thermal printers must use special thermal paper, and inkjet printers have problems such as decreased reliability due to ink clogging. On the other hand, plain paper can be used in an electrophotographic recording apparatus that forms a silent %frt image on a recording 1' ram, develops it, and transfers it onto recording paper. Such an electrophotographic recording device includes a charging means such as a corotron around a photosensitive drum having a surface of a photoconductor layer, a latent image forming means using a laser or an LED, and a developing means using toner. ``Transfer means for transferring the toner image onto the recording paper and cleaner means for removing residual toner on the photosensitive drum (k) (4i).

(3) Prior art and problems In conventional electrophotographic recording devices, the rotation axis of the photosensitive drum is arranged at an angle of 1h with the recording paper feeding direction, and the length of the photosensitive drum covers the entire width of the recording paper. It is long enough to print one line at a time.

Therefore, it has the disadvantage that the device becomes large.

(4) Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks of the prior art. The purpose is to provide recording devices.

(5) Structure of the Invention In order to achieve this object, the electrophotographic recording apparatus according to the present invention includes a charging means, a latent image forming means, a A developing means and a cleaner means are integrally configured to move and scan the recording paper in a direction perpendicular to the feeding direction of the recording paper, and a transfer means is provided on the lower surface of the recording paper in the moving scanning path of the printing device. We are prepared.

- No (6) Embodiment of the invention FIG. 1 is an external view of an embodiment of the invention. Recording paper 1 made of plain paper is fed in the direction of arrow A. A printing device 2 using an electrophotographic process is provided so as to be movable by a drive means (not shown) in a direction perpendicular to the feeding direction of the recording paper (in the direction of arrow B). A conductive rubber grade 3 is provided on the lower surface of the recording paper 1 in the moving path of the printing device 2 as a transfer means for transferring the toner image developed by the printing device 2 onto the recording paper 1. 4 is a fixed loan. The internal configuration of the printing device 2 is shown in FIG. A photoconductor layer 6 made of selenium, selenite, etc. is formed on a base drum 5 made of aluminum or the like, and a conductive brush 1 for charging is arranged around the photosensitive drum 7.
3, a surface image forming device 8 consisting of an ED array or a laser device, a water developing device 9 using -component toner, a static eliminator 11 consisting of a solid light emitting device, etc., and a cleaning bluff 12 for removing residual toner. 2" with an electric brush 13
When a voltage of, for example, IKv is applied to the photosensitive drum 7, the photoconductor layer 6 on the surface of the photosensitive drum 7 is uniformly charged to approximately 600V. On this photoconductor layer 6 is an LED array of 10 (1+1) LEDs. A latent image is formed by the δ image forming device 8 according to the character/main turn. In order to reduce the size of the developing device QL9, it is preferable to use a -component magnetic brush developing device and to use a mixed component developer in which a low-resistance magnetic toner and a high-resistance magnetic toner are mixed as the developer. During development, an electric field is generated on the latent image on the photosensitive drum 7 by the development bias voltage applied to the magnetic brush 9a, and positive charges are injected into the low-resistance magnetic toner and the high-resistance magnetic toner via the low-resistance magnetic toner. It is easy to perform and provides accurate printing. 10 is a toner supply cylinder.

Transfer is performed using a conductive rubber blade 3 provided on the back side of the recording paper 1.
By applying a negative voltage to the surface of the photosensitive drum, high resistance magnetic toner and low resistance magnetic toner are transferred from the surface of the photosensitive drum onto the recording paper by the action of the positively charged highly folded antimagnetic toner. Subsequently, the surface of the photosensitive drum is neutralized using a static eliminator 11, and the residual toner on the surface of the photosensitive drum is removed using a cleaning pusher 12. The toner image transferred to the recording paper 1 is fixed all at once over the entire width of the recording paper by a fixing roller 24 (FIG. 1).

The printing device 2 having such a configuration is, for example, integrally housed in a case 14 as shown in FIG. 3, and performs printing by connecting a drive wheel 15 provided concentrically to the photosensitive drum 7 to a drive device (not shown). The recording paper is scanned by moving in a direction perpendicular to the paper feeding direction.

In this example, a corotron 13a is shown instead of the charging conductive brush. Further, as a developing device, a microtoning developing device using iron powder of approximately the same size as the toner as a carrier can also be used. Furthermore, by arranging a plurality of printing devices of different colors in parallel, multicolor printing becomes possible.

A corotron may be used instead of the conductive rubber blade 3.

(7) As described in detail of the invention, in the electrophotographic recording device according to the present invention, the printing device section is integrated, and the photosensitive and drum rotation shafts are arranged parallel to the recording paper feed nine directions. The printing device is configured to be able to move and scan in the width direction of the recording paper. Therefore, electrophotographic technology can be applied to a serial printer, and the device can be miniaturized.

[Brief explanation of the drawing]

FIG. 1 is an external view of a recording device according to the present invention, and FIG.
The internal configuration diagram of the printing device section of the recording device shown in the figure, Figure 3 is the
FIG. 3 is an external view of the printing device shown in the figure. ■... Recording paper, 2... Printing device, : 3... Conductive rubber blade, 4... Fixing roller 2.7... Photosensitive drum, 8... Latent image forming device, 9...・Developing device, 12・
... Cleaning brush, 13 ... Conductive brush, 13
a... Corotron. Patent Applicant: Fujitsu Limited Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate 1) Yukio Patent Attorney Akiyuki Yamaguchi Text 1 Figure 20

Claims (1)

[Claims] A printing device including a charging means, a latent image forming means, a developing means, and a cleaner means is mounted around a recording drum having a rotation axis parallel to the recording paper feeding direction, and the printing device is integrally mounted on the recording paper in a direction perpendicular to the recording paper feeding direction. An electrophotographic recording device configured to be movably scannable, and comprising a transfer means on the lower surface of a recording paper in a movable scanning path of the printing device.