JPS6046577A - Nonmagnetic single-component developing device - Google Patents

Abstract

PURPOSE:To obtain superior developer feeding performance and realize long-time use without destruction by constituting a layer forming member for a developer in such a way that a control member with a 1-20mm. radius of curvature is fitted to an elastic body. CONSTITUTION:The semicylindrical control member 6 having a 5mm. radius of curvature is adhered to the front edge of an elastic blade with 0.2mm. thickness to constitute the layer forming member for the developer 7'. The nonmagnetic single-component developer 7 in a housing 1 forms the developer layer 7' having specific thikness and density by the control member 6. In this case, when the radius of curvature of the control member 6 is 1-20mm., the superior developer feeding performance is obtained. Further, when the layer forming member like this is used, there is no destruction even after >=200,000 copies are taken, and longtime use is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a non-magnetic component developing device, and more particularly to a layer forming member for forming a developer layer of a predetermined thickness and density under pressure on a carrier.

A conventional non-magnetic component developing device includes a carrier that transports developer to an electrostatic latent image on a sensitive material, and a layer forming member that forms a developer layer of a predetermined thickness and density on the carrier. The basic configuration is as follows.

In such a non-magnetic component developing device.

The shape of the layer forming member is important for the developer feedability described later] 1) The applicant first determined the diameter of the curvature of the portion of the layer forming member facing the carrier -t-IIIJI (preferably 5
An application has been filed for a non-magnetic component developing device with a length of m) or more and 20 m or less.

Specifically, as shown in Part 1, one end of the metal plate-shaped blade α is fixed to the blade holding member bK, the tip is curved and pressed against the carrier C, and the radius of the curved part is set to 1 m. With the above, it was set to 20 m or less.

With this configuration, excellent developer feeding properties can be obtained.

However, with this structure, if used for a long time, the blade α
The blade is deformed, resulting in uneven formation of the developer layer, and ultimately causes brittle fracture of the blade.

Object of the Invention The radius of curvature of the layer-forming member at the portion facing the carrier can be set to 1 m or more and 201 LH or less to provide excellent developer feeding properties and to prevent breakage even when used for a long time. The purpose is to

Structure of the invention - The layer forming member has a structure in which a regulating member having a radius of curvature of 1 m to 20 m is attached to an elastic body.

Example 8g2 is an overall cross-sectional view, in which a support member 3 is rotatably provided in a housing 2 facing the photosensitive material 1, and a holding member 4 fixed to the housing 2 has a thickness α2 that becomes an elastic member. The base end of the blade 50 is fixed, and a semi-cylindrical regulating member 6 with a radius of curvature of 5 fins is adhered to the tip of the blade 5 to form a layer forming member. It is pressed against the carrier 3 with an elastic force of .

Because of this, the non-magnetic component developer 7 in the housing 1 has a predetermined thickness at the regulating member 6.

Density developer layer? ' and is conveyed toward the photosensitive material 1 to develop the electrostatic latent image into a visible image.

Furthermore, the characteristics of the developer 70 passing between the regulating member 6 and the carrier 3 are as follows.

It showed similar values to the previously filed non-magnetic component developing device shown in FIG.

Note that the developer feedability is expressed by the following formula.

Further, the regulating member 6 has a radius of curvature of 5 as shown in FIG.
Similar developer feeding properties were also exhibited when the cylinder was shaped like u.

The developer feedability was tested by varying the radius of curvature of the regulating member 6, and it was found that good developer feedability was obtained when the radius of curvature was greater than or equal to 1 m and less than 20m. In the above cases, unfavorable developer feeding properties were obtained.

Further, a layer forming member consisting of the blade α shown in FIG.
As a result of testing the durability of the layer forming member in which the regulating member 6 is fixed to the blade 5 shown in Figs. 2 and 3, the layer forming member shown in Fig. 1 broke after 10,000 copies, but the second The layer-forming member shown in FIGS.

The radius of curvature of the portion of the effective layer forming member facing the carrier can be made less than 20W by one angle or more, providing excellent developer feedability and not being destroyed even after long-term use. .

[Brief explanation of the drawing]

Figure 81 is a cross-sectional view of the non-magnetic component developing device filed earlier.
FIG. 2 is an overall sectional view showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing another embodiment of the regulating member. 3 is a carrier, 5 is an elastic body, 6 is a regulating member, 7 is a developer,
7' is no developer. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto 1 Diagram

Claims (1)

[Claims] The developer 7 is supplied onto the carrier 3, and a developer #7' having a predetermined thickness and density is formed by the one-layer forming member, and this developer layer 7' is formed.
In the non-magnetic component developing device which conveys electrostatic latent image to a visible image and develops it into a visible image, the layer forming member has a structure in which a regulating member 6 having a diameter of curvature of 1 m to 20 IlIm is attached to an elastic body 5. Thing f: Characteristic non-magnetic component developing device.