JPS60122962A - Color copying device - Google Patents

Abstract

PURPOSE:To reproduce a uniform picture, and to make a device small-sized by constituting a titled device so that plural developing means are supported and stored so as to be freely attachable and detachable and so as to be oscillatable in a developing means storing member, and plural developing means are pressed against a photosensitive body through the developing means storing member. CONSTITUTION:Control members 34a, 34b and 34c of a plate spring, etc. are provided so that each developing means 15 is oscillated around each shaft 33a, 33b, and 33c, and a spacer ring 31 and a photosensitive body 12 are brought into contact with each other and controlled. A developing means storing member 32 is provided on a developing means installing member 35 so as to be attachable and detachable to and from a device body. The developing means installing member 35 can be turned around a shaft 36, the developing means storing member 32 is moved by rotating an eccentric cam 37, and the spacer ring 31 of each developing means 15 is pressed against the photosensitive body 12. As a result, the distance between a developing roller 27 and the photosensitive body is kept constant. According to such constitution, a uniform picture can be reproduced and the device can be made small-sized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color copying apparatus that sequentially transfers and superimposes one color at a time to form a color copy image.

Conventional configuration and problems Conventional transfer-type color copying devices have a scanning optical system that exposes the original image to color separation; a photoconductor that forms an electrostatic latent image that is exposed to one color separation; It is comprised of a developing means that visualizes an electrostatic latent image, a transfer means such as a transfer drum that transfers the visualized toner image onto a transfer material, and the like. In particular, in a color copying device using a three-time exposure/transfer method, the transfer drum is rotated in synchronization with the rotation of the photoreceptor, and the scanning optical system is driven back and forth. The developing means corresponding to the electrostatic latent image - yellow Y, magenta M, and cyan C - are sequentially switched to perform exposure φ development for each separately, and the three-color superimposed image is sequentially transferred to a transfer material placed on a transfer drum. is formed. Therefore, while one of the developing means corresponding to each color-separated electrostatic latent image is being driven, it is necessary to configure the developing means so that the toner of the other developing means does not adhere to the photoreceptor. In a conventional color copying apparatus, each developing means is connected to each other so as to be movable in a linear or rotational direction, and the designated developing means is sequentially moved toward and away from a sound photoreceptor to develop each color. In addition, in a configuration in which each developing means is arranged in parallel along the photoreceptor transport path, the developing roller in the developing means that brings toner to the surface of the photoreceptor can be moved toward and away from the photoreceptor, and designated developing means are sequentially driven. Then, each color is developed.

Such a configuration requires a mechanism and a space for moving each developing means toward and away from the photoreceptor, resulting in a complicated configuration and a large device.

In addition, variations in positional accuracy when the developing means is brought close to the photoreceptor, vibrations caused by the movement of the developing means toward and away from the photoreceptor, etc. cause image shift, density unevenness, and the like.

In a configuration in which the developing roller in the developing means can be moved toward and away from the photoreceptor, the configuration and drive control of the developing means become complicated, and problems arise due to the positional accuracy when the developing roller approaches the photoreceptor and the movement toward and away from the photoreceptor. Vibration etc. can cause image shift, density unevenness, etc.

Furthermore, a mechanism and a space for moving the developing roller are required, which increases the size of each developing means. As a result, the space for the developing means on the photoreceptor transport path increases, compressing the space for other process means, making it difficult to implement image processing that would be impossible with a compact device. This may lead to deterioration of image quality.

OBJECT OF THE INVENTION The present invention solves the conventional problems, and consists of a developing means and drive control with a simple mechanism, and the developing means is sequentially switched and driven in accordance with color-separated electrostatic latent images. This eliminates the need for adjustment when installing the developing means, and ensures uniform development at all times and eliminates unnecessary color mixing.
The purpose is to obtain a color image of a color polymerized image.

Structure of the Invention The present invention provides a collar in which a plurality of developing means are detachably supported and stored in a floating manner in a developing means storage member, and the plurality of developing means are pressed against a photoreceptor through the developing means storage member. It is a copying device.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a schematic configuration of a color copying apparatus according to an embodiment of the present invention. As shown in FIG. 1, a document Q placed on a document table glass 1 is illuminated by a light source 2 and a reflective shade 3.
The first (two 4 and
The image of the document Q is scanned by a scanning optical system 6 having a second mirror 6 and the like that moves at a rate of % of the moving speed of the first mirror 4.

The scanned original image is processed by a lens 7, a color separation means 8 having a predetermined color separation filter (for example, red 8a, green sb, blue 8C, etc.), and a third . 4th mirror 9, 10
．． The photoreceptor 12 is exposed through the dustproof glass 11.

The photoreceptor 12 is rotatably supported by a shaft 13, and is rotated in the direction indicated by the arrow in synchronization with the reciprocating drive of the scanning optical system 6 in response to operation of the copy button. A charger 14 for charging the photoreceptor 12 to a predetermined polarity (for example, positive polarity) and a toner of a predetermined number of colors (for example, yellow, magenta) are provided on the transportation path of the photoreceptor 12.

A developing means 15 (1) brings cyan) onto the surface of the photoreceptor 11.
sa, 1sb, 1sc), a transfer drum 16 for holding the transfer material P, a cleaning means 17 for removing toner remaining on the surface of the photoreceptor 12 after transfer, and the like are respectively arranged. The transfer material P is stored in a removable cassette 18 in the main body, and is conveyed to the transfer drum 16 by a paper feed roller 19 and a timing roller 2o in accordance with the operation of the copy button.
It is held at a predetermined position on the transfer drum 16 mechanically, electrically, or the like. The toner image on the photoreceptor 12 is transferred onto the transfer material P by rotating the photoreceptor 12 and the transfer drum 16 synchronously and applying a DC voltage (for example, ■ voltage) to the transfer drum 16. The transfer material P on which a predetermined number of colors have been transferred is conveyed to a fixing device 22 by a conveyor belt 21, and after being heated and fixed, is discharged onto a tray 23.

FIG. 2 is a sectional view of a main part illustrating an embodiment of a configuration in which developing means for a predetermined number of colors are arranged in parallel on the photoreceptor transport path.

The developing means 1s (1sa, 1sb, 1sc) includes a cylindrical sleeve 25 made of a non-magnetic material rotatably supported by the developing means housing 24, and a magnetic sleeve 25 provided in the sleeve 25 so as to be rotatable relative to the sleeve 25. A developing roller 27 composed of a roller 226 and the like, an agitating member 2B that stirs the developer T accumulated in the lower part of the developing means housing 24 and supplies the developer T onto the developing roller 27, and the developing roller 27. Doctor blade 29 that adjusts the height of the upper developer spikes
, a scraper 30 that removes the developer adhering to the developing roller 227 after development, and a spacer ring 31 that is installed concentrically with the developing roller 27 and can set the distance between the photoreceptor 12 and the developing roller 27, etc. It is made up of. The developing means 15 has shafts 33a and s provided in the developing means storage member 32.
ab and 33c, respectively, and are provided to be swingable and removable. Developing means storage member 32 or developing means 15
In this case, each developing means 15 is connected to each shaft 33a, 33b.

Regulating members 34a, 34b, and 34c, such as plate springs, are provided to allow the spacer ring 31 to swing about 33c and to restrict the contact between the spacer ring 31 and the photoreceptor 12. The developing means storage member 32 is provided on the developing means installation member 36 so as to be removably attached to the main body of the apparatus.

The developing means installation member 36 is rotatable about the shaft 36, and by rotating the eccentric cam 37, the developing means storing member 32 is moved and the spacer ring 31 of each developing means 15 is pressed against the photoreceptor 12. However, the distance between the developing roller 27 and the photoreceptor is kept constant. Each sleeve 26 of the developing means 16 mounted on the main body of the apparatus is connected to rotate in the direction of arrow B, for example, by a gear or the like (not shown). Moreover, the regulating members 34a, 34b, 34
c, the photoreceptor 12 and each spacer ring 31 of the developing means 16 are always brought into contact and regulated, so that the photoreceptor 1
The developing roller can be rotated while keeping the distance between the developing roller 2 and the developing roller 27 constant. Each magnetic roller 26 of the developing means 16 is rotatably driven by a magnetic roller motor (not shown) provided therein. A sleeve motor (not shown) is driven in response to the copy button operation to copy each sleeve 25.
By rotating the magnetic roller 26, a magnetic seal is formed between the magnetic roller 26 and the doctor blade 29 by the magnetic field of the magnetic roller 26, and as shown by the developing means 15a and 16b in FIG. The supply of developer stopped and the developing roller 2, which had been supplied near the photoreceptor 12,
The developer on 7 is scraped off by a scraper 30 and collected into the developing means housing 24. By driving the magnetic roller motor and rotating the magnetic roller 226 in accordance with the color-separated electrostatic latent image formed on the photoreceptor 12, a doctor blade 29c is used to develop a predetermined panicle, as shown by the developing means 15c in FIG. The developer adjusted to the vertical height comes into contact with the surface of the photoreceptor 12 and develops the color-separated electrostatic latent image formed on the photoreceptor 12. After development, the developer on the developing roller 27 is scraped off by a scraper 30.

Advantages of the Invention With the above configuration, maintenance such as replacing and replenishing the developer is facilitated since there is no need to adjust the position of the developing means with respect to the photoreceptor when the developing means is installed in the main body of the apparatus. can be achieved. Moreover, it is extremely effective in reliably achieving uniform image reproduction, since fluctuations caused during driving are reduced and the fluctuations can be followed with good followability, and development can always be carried out in an optimal state. Further, the space required for the mechanism and space for attaching and detaching the developing means and for moving the developing means toward and away from the photoreceptor is greatly reduced, and the apparatus can be simplified and miniaturized. Furthermore, the structure and drive control of the developing means are simplified, and the developing means can be downsized, making it easier to arrange each process means on the photoreceptor transport path, and achieving high-quality three-color polymerization without unnecessary color mixing. A color image of the image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing a schematic configuration of a color copying apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional side view of essential parts showing an example of the configuration of developing means for a predetermined number of colors of the same apparatus. be. 12... Photoreceptor, 14... Charger, 16
...Developing means, 16...Transfer drum,
17...Cleaning means, 18...
Cassette, 19...Paper feed roller, 2o...
・・Timing port=2.22・・・・Fuser, 26
... Magnetic roller, 27 ... Developing roller, 29 ... Doctor blade, 30 ...
・Screen-, 34a, 34b, 34c...
・Regulation member, 32... Storage member, 31...
...Spacer ring. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure No. 2111 2

Claims (1)

[Claims] A photoconductor for forming an electrostatic latent image of a document image, a plurality of developing means each containing a different type of developer for developing the electrostatic latent image on the photoconductor, and the plurality of developing means are detachably attached. A color copying apparatus comprising: a developing means housing member that supports and stores the developing means in a floating manner; and a suppressing means that presses the plurality of developing means against the photoreceptor via the developing means housing member.