JPH0447728Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a developing device used in an image forming device such as an electronic copying machine or an electrostatic printer, and in particular, the present invention relates to a developing device used in an image forming device such as an electronic copying machine or an electrostatic printer. Concerning things that are easily configured.

(b) Conventional technology In recent years, in the electronic copying machine industry, toners other than black (for example, blue and red) have been developed in response to requests from users who wish to use toners other than black. It is becoming possible to obtain copies (recorded materials) in different colors.

However, if toners of different colors are put into the same developing device, the toners will be mixed and it will not be possible to obtain a copy (recorded material) of the desired color.

Therefore, a developing device dedicated to each color is prepared, and when trying to obtain a copy (recorded material) of a desired color, the developing device containing toner of the desired color is installed in an electronic copying machine, etc. There is a need.

In view of this need, for example, Japanese Utility Model Application Publication No. Sho 58-149747 discloses a developing device in which the main body of the developing device can be relatively easily attached to and removed from the chassis.

The device described in the above publication includes guide grooves provided inside the main body of the copying machine so as to face each other, a support rod extending between these guide grooves in parallel with the rotational axis of the photosensitive drum, and this support rod. a magnetic brush slidably mounted on a support rod in the longitudinal direction; and a clutch means for engaging a drive shaft of the magnetic brush with the driving shaft when the magnetic brush is moved in one direction along the support rod. A developing device for a copying machine is characterized in that the developing device is screwed to a chassis.

In addition, in order to obtain a uniform and good developing effect in an image forming device, it is necessary to maintain a constant distance between the photoreceptor drum and the developing device. In order to develop an image, a developing device using a developing roller that applies developer to the image carrier has a roller installed concentrically with the rotating shaft of the developing roller, and the roller is brought into contact with the surface of the image carrier. The developing device is characterized in that the distance between the image carrier surface and the developing roller surface is maintained constant.

(c) Problems to be solved by the invention As mentioned above, in Utility Model Application Laid-Open No. 58-149747, the main body of the developing device is constructed so that it can be relatively easily attached to and detached from the chassis. Even in this case, the screws had to be attached and removed, and such work was complicated.

Further, in Japanese Patent Publication No. 59-28908, although the distance between the photosensitive drum and the main body of the developing device can be kept constant, the ease of attaching and detaching the main body of the developing device is not taken into account.

The present invention has been made in view of the problems of the prior art.

(d) Means for Solving the Problems The present invention provides a pair of guides in which guide grooves for holding the developing device main body are formed in the opposing inner walls of the image forming device main body and extend in the vertical direction. It is characterized in that the body is swingably mounted, and an elastic body is mounted between the guide body and the inner wall for biasing the guide body toward the photoreceptor.

(E) Function By slidingly engaging the developing device main body with the guide groove of the guide body and urging the guide body toward the photosensitive drum side, the developing device main body can be easily attached and detached, and the developing device main body and the photosensitive drum can be easily attached and removed. Keep the distance between body drums constant.

(F) Embodiment FIG. 1 is a sectional view showing the positional relationship between the photosensitive drum 1 and the guide body 2. Here, the photoreceptor drum 1 is an inner wall (not shown) of an image forming apparatus main body (not shown).
is supported by 3 is a guide groove provided in the guide body 2, and 4 is a shaft formed on the inner wall of the image forming apparatus main body, which serves as a pivot point for the guide body 2.

Further, reference numeral 5 denotes a spring as an elastic body provided in the guide body 2, and this spring 5 comes into contact with a shaft 6 formed on the inner wall of the image forming apparatus main body. It is inserted into hole 7.

Therefore, in this state, the guide body 2 is positioned by urging the shaft 6 toward the right end of the through hole 7 by the spring 5.

When the shaft 9 of a mag roller (not shown) provided in the main body 8 of the developing device is slidably engaged with the guide groove 3 as shown in FIG. 2, the result will be as shown in FIG. 3. In this case, the guide body 2 does not move from the position shown in FIG. That is, the distance between the photosensitive drum 1 and the developing device main body 8 is maintained by the contact between the right end of the through hole 7 and the shaft 6.

Further, FIG. 4 is a cross-sectional view of the developing device main body of another embodiment, and the difference from the developing device main body 8 of FIG. This is where I am.

The shaft 9 of the developing device main body 11 equipped with this roller 10
When it is slidably engaged with the guide groove 3, it becomes as shown in FIG. As is clear from the figure, the spring 5 is connected to the roller 10 that determines the distance between the photoreceptor drum 1 and the mag roller.
is biased in one direction of the photoreceptor drum, and the roller 10
The larger the diameter, the larger the distance between the shaft 6 and the right end of the through hole 7. That is, the distance between the photosensitive drum 1 and the developing device main body 11 is maintained by the contact between the rollers 10 and the photosensitive drum 1.

In the above-described embodiment, only one of the pair of guide bodies supported by the main body of the development forming apparatus is illustrated.

(g) Effects of the invention In the present invention, the developing device main body is fixed to the image forming device main body simply by slidingly engaging the developing device main body along the guide groove of the guide body provided on the inner wall of the image forming device main body, and moreover, the guide body is fixed to the image forming device main body. It is urged by an elastic body in the direction of the photoreceptor drum.

Therefore, according to the present invention, the developing device main body can be attached and detached from the image forming device main body with a single touch without removing or attaching screws as in the conventional method, and after installation, the distance between the photosensitive drum and the developing device main body can be maintained constant. At the same time, when the developing device main body is detached, the developing device main body can be swung in a direction away from the photoreceptor drum against the elastic body, and as a result, toner is exposed from the developing device main body and faces the photoreceptor drum. It can also prevent the particles from being scattered around.

[Brief explanation of the drawing]

1 to 5 are cross-sectional views of embodiments of the present invention, respectively. 1... Photosensitive drum, 2... Guide body, 3...
Guide groove, 4, 6...Shaft, 5...Spring,
8, 11...Developing device main body, 9...Shaft, 10...
Coro.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of guide bodies having vertically extending guide grooves for holding the developing device main body inside the opposing inner walls of the image forming device main body are swingable. 1. A developing device, wherein an elastic body is attached between the guide body and the inner wall to urge the guide body toward the photoreceptor. 2. The developing device according to claim 1, wherein a shaft of a mag roller provided in the developing device main body can be slidably engaged with the guide groove. 3. The developing device according to claim 2, wherein a roller having a diameter larger than that of the mag roller is attached to the shaft, and the roller comes into contact with the photosensitive drum.