JPS6032668Y2 - Developing device in electronic copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a developing device in an electronic copying machine.

Conventionally, a developing device in an electronic copying machine always stirs developer B in a fixed direction with respect to a photoreceptor A such as a transfer drum, as shown in FIG.

That is, the stirring blade C that stirs the developer B contained in the developing device E is a magnetic roller D disposed near the photoreceptor A.
The developer B is stirred by rotating in a direction perpendicular to the surface of the developer B.

Therefore, for example, if a photoreceptor A is developed over an A4 size width and then developed into a larger B44 size, there is a difference in the thickness of the developer B adhering to the magnetic roller D, so the dimensions of the B4 size and A4 size are different. There was a drawback that image unevenness occurred on the transfer paper in the area of difference.

In view of the above-mentioned points, it is an object of the present invention to provide a developing device for an electronic copying machine that eliminates image unevenness that occurs when developing transfer sheets of different sizes.

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In the figure, 1 is a photoreceptor, and 6 is a developing device installed close to the photoreceptor 1.

The developing device 6 includes a developer supply section that supplies the developer 2 to the photoreceptor 1, which is provided in a developing device 5 containing the developer 2, such as a magnet roller 4 that constantly rotates, and a developer supply section that supplies the developer 2 to the photoreceptor 1. 2, a stirring belt device that controls the stirring action.

That is, the first gear 8, the second gear 9, and the third gear 10 rotate in conjunction with the movement of the developing device drive motor 7, and the second gear rotates.
The gear 9 rotates the magnet roller 4.

And the bevel gear 1 fitted on the shaft 11 of the third gear 10
2 meshes at right angles with a bevel gear 14 which is pivotally supported on an L-shaped support plate 13 and rotates a coaxial sprocket wheel 15.

Furthermore, the sprocket wheel 15 is connected to a sprocket wheel 17 which is pivotally supported on an L-shaped support plate 16 and a chain 1.
8 (or a belt) and always rotates in a fixed direction.

A stirring piece 19 is fixed to the chain 18, and as the chain 18 runs, the stirring piece 19 stirs the developer 2 in the developing device 5.

In addition, blocks 20 and 20 installed on both sides of the developing device 5
' is for preventing areas that cannot be stirred by the stirring piece 19.

The developer 2 uniformly stirred by the stirring belt device as described above is attached to the surface of the magnetic roller 4 and supplied to the photoreceptor 1 side, and the developed developer 2 is transferred to the souffle bar piece 21.
scraped off by.

The scraped off developer 2 is stirred in the longitudinal direction of the photoreceptor 1 by the stirring piece 19, so that a constant concentration of developer can always be supplied.

As described above, according to the present invention, the developer stored in the developing device is circulated in the longitudinal direction of the photoreceptor by installing an agitation belt device that can agitate the photoreceptor in the longitudinal direction. Features.

Therefore, the developer is sufficiently agitated, and the developer can be supplied at a constant concentration over the entire length of the developer supply section.As a result, image unevenness due to image size can be prevented, and the structure is simplified. Moreover, it has practical effects.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing a conventional developing device, and Fig. 2 is a stirring range (perspective section) of the agitating belt device of the developing device of the present invention.
3 is a plan view of a developing device showing an embodiment of the present invention, FIG. 4 is a front view of the same device, FIG. 5 is a v-v' sectional view of FIG. 3, and FIG. The figure shows a sectional view taken along line VI-VI' in FIG. 1...Photoreceptor, 2...Developer, 4...
...Developer supply section, 5...Developer, 19.
...Stirring piece, 20,20'...Block.

Claims (1)

[Scope of utility model registration request] It is equipped with a developer supply section disposed along the longitudinal direction of the photoreceptor, and an agitation belt device formed by protruding agitation pieces from a chain or an endless annular belt running parallel to the developer supply section. A developing device for an electronic copying machine, which is characterized by: