JPH0782286B2 - Image recorder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording device that records an image using an electrostatic latent image forming means.

2. Description of the Related Art An image recording apparatus for developing an electrostatic latent image formed on an electrostatic latent image carrier by a conventional electrostatic latent image forming means by a developing device and transferring the obtained toner image onto a sheet for recording is For example, an electrostatic recording head is used as a means for forming an electrostatic latent image on the electrostatic latent image carrier.

The electrostatic recording head is composed of charge generating means and a control electrode, and the ions generated from the charge generating means toward the electrostatic latent image carrier are controlled on the carrier by controlling the ions with the control electrode. It is designed to form an electrostatic latent image.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the recording apparatus using the electrostatic recording head as described above, foreign matters such as toner and paper dust that have not been completely removed from the electrostatic latent image carrier in the cleaning process and the inside of the apparatus. When foreign matter such as toner floating in the toner adheres to the charge generating means or the like, abnormal discharge or defective discharge occurs and the image is disturbed, or the image cannot be formed.

The present invention has been made for the purpose of improving the above problems.

Means and Actions for Solving Problems In order to achieve the above-mentioned object, the present invention provides an electrostatic latent image forming means for forming an electrostatic latent image on an electrostatic latent image carrier by an electrostatic latent image forming means. A plurality of electrodes are provided in the vicinity of the electrostatic latent image forming means, and a bias voltage having a polarity different from that of the other electrodes is applied to at least one of these electrodes so that the electrodes and the electrostatic latent image carrier are By generating an electric field between them, it is possible to remove foreign matter of positive polarity and negative polarity by adsorbing to each electrode and removing it, so that the foreign matter adheres to the electrostatic latent image forming means and the image is disturbed, It is possible to solve problems such as image formation being disabled.

EXAMPLE An example of the present invention will be described in detail with reference to the drawings.
The figure is a schematic view of the main body of the recording apparatus, in which 1 is an electrostatic latent image carrier, 2 is an electrostatic latent image forming means such as an electrostatic recording head installed in the vicinity of the carrier 1, As shown in FIG. 2, a charge generating means 3 to which a bias power supply 3c is applied between a shield case 3a and an electrode 3b housed in the shield case 3a, and an electrode 4 provided above and below the insulator 4a.
The control electrode 4 is provided with an image signal 4d consisting of an on / off signal between b and 4c, and ions 5 generated by the charge generation means 3 and directed to the electrostatic latent image carrier 1 are controlled electrode 4.
It is configured to form an electrostatic latent image on the electrostatic latent image carrier 1 by controlling with.

On the other hand, 6 is a foreign matter removing means provided in the vicinity of the electrostatic latent image forming means 2 and comprises a plurality of electrodes 6a made of metal such as stainless steel or nickel, and a bias for applying a DC bias voltage of different polarity to these electrodes 6a. It consists of power supplies 6b and 6c.

An electric field of several KV / mm is generated between the electrode 6a of the foreign matter removing means 6 and the electrostatic latent image carrier 1 by the application of a bias voltage, and this causes the electric field to remain on the electrostatic latent image carrier 1. The foreign matter 7 such as the toner, the paper dust, the toner floating in the apparatus,
As shown in FIG. 3 (b), it is attracted to the electrode 6a and adsorbed before adhering to the electrostatic latent image forming means 2.

As the electrode 6a of the foreign matter removing means 6, a flat plate or a disc,
A wire, a grid, a screen or the like is used, and electrodes 6a are installed in front of and behind the electrostatic latent image forming means 2 (with respect to the latent image forming direction) as shown in FIG. Bias voltages of different polarities are applied to the bias electrodes 6b and 6c, so that both positive and negative polarity foreign matter can be removed, so that more complete foreign matter removal is possible.

On the other hand, FIGS. 5 (a) and 5 (b) show an example in which the electrode 6a is formed in a reverse concave cross section and the electrostatic latent image forming means 2 is housed in the groove 6d. The electrode 6a is divided into two. Then, bias voltages of different polarities are applied to the respective bias power sources 6b and 6c.

FIG. 6 shows an example in which the electrode 6a of the foreign matter removing means 6 is curved so as to match the curved surface of the electrostatic latent image carrier 1, and the foreign matter removing effect is further improved.

Although any of the above embodiments shows the case in which the foreign matter removing means 6 is provided in the vicinity of the electrostatic latent image forming means 2, the same can be applied to a charger, a transfer device or the like in which foreign matter adheres. Is.

As described above in detail, the present invention provides a plurality of electrodes to which a bias voltage having different polarities is applied in the vicinity of the electrostatic latent image forming means, and these electrodes adhere to the electrostatic latent image carrier. It is designed to adsorb and remove foreign matter such as paper, paper dust, and floating toner, and even if the foreign matter has positive or negative polarity, the amount of foreign matter adhering to the electrostatic latent image forming means can be greatly reduced. It can be reduced.

As a result, it is possible to prevent abnormal discharge or defective discharge of the electrostatic latent image forming means, and thus stable image formation is always possible.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an overall configuration diagram of a recording apparatus, FIG. 2 is an explanatory diagram of electrostatic latent image forming means,
FIG. 3 (a) is a perspective view of the foreign matter removing means, FIG. 3 (b) is an explanatory view of the same action, FIG. 4 is an explanatory view showing a state in which a bias voltage of different polarity is applied to the electrodes, and FIG. (a), (b) and FIG. 6 are explanatory views showing another embodiment. Reference numeral 1 is an electrostatic latent image carrier, 2 is an electrostatic latent image forming means, and 6 is a foreign matter removing means.

Claims (1)

[Claims] 1. An image recording apparatus for forming an electrostatic latent image on an electrostatic latent image carrier 1 by the electrostatic latent image forming means 2, wherein a plurality of electrodes are provided in the vicinity of the electrostatic latent image forming means 2. 6a is provided, and at least one of these electrodes 6a is provided with another electrode 6a.
An image recording apparatus characterized in that a bias voltage of different polarity is applied to generate an electric field between the electrodes 6a and the electrostatic latent image carrier 1.