JPS60233674A - Developing device for one component type developer - Google Patents

Abstract

PURPOSE:To reduce the size of a developing device by feeding a developer from a developer cartridge located in a developing roll to the surface of said roll. CONSTITUTION:The cartridge 6 of the nonmagnetic toner is arranged in the developing roll 1, and the toner is conveyed with an auger device 7 to the surface of the roll 1. Since the auger devices 7 are fixed to the both end sides of the roll 1, uniform toner feed in the longitudinal direction of the roll 1 can be ensured. As a result, the toner storage space need not provide in other places, thus permitting the developing device to be reduced in size.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a one-component developer to the surface of a developing roll, and develops the electrostatic latent image by adhering the one-component developer to an electrostatic latent image on a photoreceptor. It relates to a developing device.

[Prior art]

FIG. 1 shows a conventional developing device.

In FIG. 1, reference numeral 1 denotes a developing roll, and a toner hopper 2 for supplying a one-component non-magnetic developer, that is, toner, is arranged above the developing roll. A developer conveying roll 3 is in contact with the developing roll 1 . The developer transport roll 3 has a foamed outer layer 3b provided on the outer surface of a rigid core 3a, through which the toner supplied from the toner hopper 2 is transported to the surface of the development roll while being triboelectrically charged. Contact blades 2a and 2b are attached to the outer wall of the toner hopper 2 on the surfaces of the transport roll 3 and the developing roll 1 to prevent toner from leaking to the outside. In addition to this function of preventing toner leakage, the blade 2b also has a function of regulating the thickness of toner on the surface of the developing roll 5. Reference numeral 4 denotes a developing bias means, which applies a developing bias to the developing roll 1 to cause toner to adhere to the electrostatic latent image on the photoreceptor, thereby performing development.

Incidentally, copying machines have recently been trending toward ultra-miniaturization, and it is important to efficiently install the above-mentioned toner hopper, conveyance roll, etc. within a limited space. Particularly in the case of a developing device equipped with a developing bias means, as in the case of a double series example, this developing bias means occupies a large space, and the key to downsizing the copying machine is how well the other devices are arranged. It will be held. In particular, in the case of a multi-color developing device, it is necessary to provide a plurality of toner hoppers 2 and conveyance rolls 3, so the requirement stated in "-1" becomes very large.

[Purpose of the invention]

In view of the above-mentioned points, the present invention aims to miniaturize the developing device as much as possible.

[Structure of the invention]

The present invention provides a developing device in which a one-component developer is supplied to the surface of a developing roll and the one-component developer is attached to an electrostatic latent image on a photoreceptor for development, and a developer cartridge is provided inside the developing roll. The present invention is characterized in that a developer replenishing means is provided for replenishing the developer from the developer cartridge to the surface of the developing roll.

[Effects of the Invention] According to the present invention, since the space in the hollow part of the developing roll is effectively utilized and the developer cartridge is disposed inside the hollow part, it is possible to achieve ultra-miniaturization of the developing device. Particularly in the case of a multicolor developing device, this is useful because all the plurality of toner cartridges are arranged in the hollow part of the developing roll. Furthermore, since a toner cartridge is used, toner can be easily replenished.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of the present invention, in which a toner cartridge 6 is disposed inside the developing roll 1, and non-magnetic toner is transferred from the toner cartridge (j to the auger device 7 having a predetermined mechanism). The toner cartridge 6 is conveyed to the surface of the developing roll by the developer roll 1.
The auger device 7 is moved in the y direction by a predetermined mechanism (not shown) after toner is replenished. For this purpose, the entire auger device 7 is flexibly mounted on a flange 8. This auger device 7 is attached to both end surfaces of the developing roll I, thereby making toner supply in the longitudinal direction of the developing roll more uniform and making it possible to provide sufficient toner transport.

FIG. 3 shows an example in which the present invention is applied to a revolver type multicolor developing device. In the developing device shown in FIG. 3, multicolor toner cartridges 9a, 10a, lla, 12a are arranged inside four developing rolls 9, 10, 11, 12, and auger devices 9b, 10b, lla are arranged in each toner cartridge.
b, 12b are connected. This device also does not require a toner storage space as shown in FIG. 1, so the developing device itself can be downsized. Further, this developing device is configured to rotate when selecting each color toner, but in this case, since the toner is contained inside the developing roll, the toner does not spill.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing a developing device for non-magnetic component developer in the prior art, FIG. 2 is a schematic sectional view showing one embodiment of the present invention, and FIG. 3 is a revolver-type multicolor FIG. 2 is a schematic cross-sectional view showing an example applied to a developing device. 1.9, 10, 11.12 Developing roll, 2 Toner hopper, 3 Conveyance roll, 4 Developing bias device, 5
Photoreceptor, 6.9a, 10a. 11a, 12a-)ner cartridge, ? , 9b, 10
b, 1 lb, 12b auger device. Continuation of page 1 @ Inventor Shoshi Keima @ Inventor Hyakutake Nobuo @ Inventor Tachibana Hidekiyo @ Inventor Sunaga Takayuki 0 Author Takashi Yamamuro 0 Inventor Toru Teshigawara 0 Author Shigeru Inaba @ Inventor Imai Takashi 0 Inventor Oka 1) Ryuzo 2274 Hongo, Ebina City, Fuji Xerox Co., Ltd. Ebina Office

Claims (1)

[Claims] In a developing device that supplies a one-component developer to the surface of a developing roll and causes the one-component developer to adhere to an electrostatic latent image on a photoreceptor for development, a developer cartridge is removably disposed inside the developing roll. A developing device for a one-component developer, comprising a developer replenishing means for replenishing the developer from the developer cartridge to the surface of the developing roll.