JPS6048066A - Copying machine - Google Patents

Abstract

PURPOSE:To decide on a destaticize position accurately by installing a device which destaticizes the no-image part of a photosensitive body with light on the top surface of a developing tank which develops a latent image on the photosensitive body. CONSTITUTION:Destaticizing lamp bodies L1 and L2 fitted onto the cover 3a of the developing tank 3 are provided with two lamps A and B, a slit S which limits the optical paths of their ligh emission, and an adjusting plate T which adjusts the opening area of an exit aperture. The developing tank 3 is arranged at an accurate position for the photosenstive body 1, so a destaticizing light source is positioned accurately. Therefore, the discharging area is determined accurately, and the need for a positioning guide, etc., dedicated to the optical destaticizing device is eliminated and to reduce the number of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a photographing machine, and more particularly to an optical static eliminating device for optically neutralizing a non-image area on a photoreceptor provided in a copying machine.

<Prior Art> There is the following method as a conventional 1d1 optical charge removal method for a non-image area when changing magnification. Note that the optical static eliminator is equipped with a light source.

(1) A method in which a photostatic charge eliminator is installed at a certain distance from the surface of the photoreceptor to perform photostatic charge removal. (2) A method in which a light emitting element optical charge remover is installed near the surface of the photoreceptor to perform photostatic charge removal.

In the method (1) above, it is difficult to determine the position on the photoconductor where static electricity is to be removed because it is far from the surface of the photoconductor, and the light source has a large amount of light because it is far away. is required.

In the method (2) above, since the light source is installed near the photoreceptor, the amount of light from the light source is small, but there are restrictions due to space constraints, and most of the methods are simply fitted with LEDs, wedge bulbs, etc. For this reason, in the boundary area between the original image area and the non-image area on the photoreceptor, the light emission for charge removal may proceed to an unnecessary part, and there is no means for accurately positioning and adjusting the charge removal position. This can easily lead to some inconvenient situations.

<Objective of the Invention> In order to improve the drawbacks of the above-mentioned systems, the present invention provides a copying machine having an optical charge removal device that can accurately determine the charge removal position with a small amount of light.

<Example> Hereinafter, the present invention will be described in detail with reference to the drawings. In the copying machine of this example, an optical static eliminator was developed so as to satisfy the following two conditions.

■ In copying machines (electrostatic type), due to problems such as the decay of the charge on the photoreceptor and the compactness of the device, it is difficult to distinguish between the processes of charging the photoreceptor, exposure, and visual image by increasing the gap by more than 9 degrees. .

■ On the other hand, in order to optically neutralize the non-image area (parts on both sides or one side of the photoconductor in a direction parallel to the direction of travel of the photoconductor) during magnification, it is necessary to light must be irradiated. That is, light irradiation must be performed before, after, or simultaneously with the projection of the original image onto the photoreceptor.

Therefore, in this embodiment, an optical static eliminator was added to the developer tank for developing the electrostatic latent image on the photoreceptor.

FIG. 1 is a structural diagram related to the copying part of the copying machine of this embodiment, and 1 is a photosensitive drum. Below, each step will be explained in order.

(a) Charging process The photosensitive drum 1 is charged with ions by the charger 2.

(b) Exposure step An electrostatic latent image of the image of the original document sent by an optical system (not shown) is formed on the photosensitive drum 1. The exposure optical path is indicated by K.

(c) Static elimination process A static elimination light is irradiated onto the photosensitive drum 1 from a static elimination lamp body. This static elimination lamp body is integrally fixed with the tilted developer tank 3 (on the side where the charger 2 is located, that is, the side through which the optical path for exposing the original image passes) of the developer tank (box) 3 that performs the next step of development. Since the developer tank 3 is installed at an accurate position with respect to the photosensitive drum IVC due to the nature of the three-developer copying machine, the developer tank 3 can accurately position the light source for charge removal. The specific structure of the static elimination lamp body is as shown in FIG. Static elimination lamp bodies LI and L2 are set at both ends of the edge adjacent to the drum 1.

Since these two static elimination lamp bodies L+, L2 have the same internal structure, only one static elimination lamp body L1 will be described.

Static elimination lamp body L + Kh Two lamps A and B are provided, and both lamps A and B are connected to the lamp holding printed circuit board P.
WBK is installed.

Each lamp A and B is placed on the photosensitive drum 1 side.
, B is provided to restrict the optical path of the emitted light from the slits S, and the light exits the building only through the gap (exit opening) of each slit s. In addition, a movable adjustment plate T is attached to the front surface of the outlet opening of each sulin (S) to appropriately reduce (or enlarge after reducing) the open area of the outlet opening.

Each of the above components is attached to the lid 3a with the side rung holder H.
is fixed with screws.

Note that this static elimination lamp body LI+L2 is constructed as a separate part from the developer tank 3, and is fixed to the lid 3a of the developer tank 3 with screws (by fixing it in a long length, the static elimination lamps L+ and L2 can be made movable). However, it is also possible to integrally form the lid 3a and the static elimination lamp bodies L+ and L2 with aluminum sash or the like.

In addition, the direction of the filaments of lamps A and B is
In order to clarify the boundary between the static elimination area and other areas on the photosensitive drum 1, it is oriented in the rotational direction of the photosensitive drum 1.

B) Development process Particles are supplied from the developer tank 3 and are electrically attracted to the latent image to perform development.

Ou　Transfer process Transfer is performed by the transfer charger 4.

At this stage, the paper is sent to a fixing device (not shown).

(f) Static elimination process and cleaning process The surface layer of the photosensitive drum 1 is neutralized by the static elimination charger 5, and subsequently cleaned by the cleaner 6.

Effects> As described above, according to the copying machine of the present invention, since the optical static eliminating device for optically eliminating static electricity from the non-image area on the photoreceptor is provided above the developer tank, ■ the static electricity removal area can be precisely eliminated. You can decide.

■ The positioning of the light source for static elimination becomes accurate.

■ The number of parts can be reduced because there is no need for positioning, guides, etc. exclusively for the optical static eliminator.

obtain the effect of

[Brief explanation of drawings]

FIG. 1 is a structural diagram centered on the photosensitive drum of a copying machine according to the present invention, and FIG. 2 is a structural diagram of an optical neutralization device that characterizes the copying machine according to the present invention. 1...Photosensitive drum, 2...Charger, 3...Developer tank, 3
a... Lid of developer tank 3, 4... Transfer charger,
5... Static elimination charger, 6... Cleaner, L, L
l. L2... Static elimination lamp body, A, B... Lamp, PWB
・Printed circuit board, S...slit, T adjustment plate, H・
・Side lamp holder. Agent Patent attorney Aihiko Fuku (and 2 others) 5 1st g
I

Claims (1)

[Claims] 1. A copying machine equipped with an optical static eliminating device for optically eliminating static electricity in a non-image area on a photoconductor, characterized in that the optical static eliminating device is disposed in a developer tank for developing a latent image on the photoconductor. copy machine.