JPS6053972A - Developing device - Google Patents

Abstract

PURPOSE:To enable formation of a uniform developer layer over a longitudinal direction on a carrying body by forming a layer forming member which forms the thin layer of the developer on the carrying body into the shape at which both ends in the longitudinal direction contact with the carrying body at the stronger force than in the intermediate part. CONSTITUTION:A blade 2 for forming a thin layer of a developer on a carrying body 1 in press contact therewith is formed of a thin-walled plate-shaped metal and reinforcing plates 3 consisting of metallic plate-shaped bodies are attached and fixed to both ends in the longitudinal direction thereof. The rigidity at both ends is therefore made larger than the rigidity in the intermediate part. If the blade 2 constituted in such a way is pressed to the body 1 under uniform pressure over the longitudinal direction, the pressure exerted to the body 1 is higher in the parts facing both ends in the longitudinal direction than in the part facing the intermediate part. The developer is thus surely sealed without spilling from both ends and the developer layer having a uniform layer thickness in the longitudinal direction is formed in the stage of forming the developer layer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a developing cylinder used in an electronic copying machine or the like, and more particularly, to forming a developer supplied onto a carrier into a layer-forming member to a predetermined thickness. As a layer.

The present invention relates to a non-magnetic component developing device that transports this developer layer to an electrostatic latent image and develops it into a visible image.

Prior Art As shown in FIGS. 1 and 2, a layer forming member is brought into contact with the carrier α with uniform pressure, and the layer forming member forms a developer layer of a predetermined thickness. 2. Description of the Related Art A developing device is known that conveys a developer layer to an electrostatic latent image and develops it into a visible image.

However, in the above-mentioned developing device, the layer forming part is in the form of a thin plate and is in contact with uniform pressure in the six longitudinal directions, so when forming the developer layer, the layer forming member The problem is that the developer falls off from both ends in the longitudinal direction, making it impossible to form a uniform developer layer in the longitudinal direction.

OBJECT OF THE INVENTION It is an object of the invention to prevent developer from spilling from both longitudinal ends of a layer forming section and to form a uniform developer layer in the longitudinal direction.

The constituent layer forming member of the invention is shaped so that both ends in the longitudinal direction are in contact with the carrier with stronger pressure than the middle part.

Embodiment FIG. 3 is a perspective view, and FIG. 4 is a side view. 91 A thin plate-shaped blade 2 is in contact with a cylindrical carrier 1 under a predetermined pressure. Reinforcing plates 3.degree. 3 are attached and fixed to both ends in the longitudinal direction on the back surface of the layer forming member.

The blade 2 is made of a metal such as phosphor bronze or stainless steel and has a thickness of 0.1 mm and a width of 30 m and a predetermined length.The reinforcing plate 3 is made of a metal such as phosphor bronze or stainless steel and has a thickness of 0.1 m and a width of 30 mm. It becomes a plate-like body with 10 sections of Nagahata.
It is attached and fixed to both longitudinal ends of the blade 2, and the thickness of both longitudinal ends (length lowg) of the layer forming part I is α2.
At w11, the thickness of the middle part is 0.1+m++, and the rigidity of both ends is greater than that of the middle part.

Because of this, when the single-layer forming member is pressed against the carrier 1 with uniform pressure (for example, 100/^) over the longitudinal direction, the pressure applied to the carrier 1 is equal to the pressure applied to both longitudinal ends of the layer-forming member. The opposing part is also higher than the part facing the middle part.

Therefore, when forming the developer layer, the developer is reliably sealed from both ends of the layer forming member in the longitudinal direction without scattering, and a developer layer that is uniform in the longitudinal direction is formed. In the embodiment, a reinforcing plate 3 is attached, but the thickness of each plate is made thicker at both ends in the longitudinal direction.

The thickness of the middle part may be made thinner, and both ends in the longitudinal direction may be made of a material with strong rigidity.

The width at both ends in the longitudinal direction may be slightly wider than the width at the middle portion.

It is only necessary that both ends in the longitudinal direction of the one-layered tamp member come into contact with the carrier with stronger pressure than the middle part.

The effect of the invention is that the developer does not spill from both ends in the longitudinal direction of the layer forming member, and a uniform developer layer can be formed in the longitudinal direction.

[Brief explanation of drawings]

1 and 2 are a perspective view and a side view of a conventional example. Embodiments of the present invention are shown from FIG. 3 onwards, in which FIG. 3 is an overall perspective view, FIG. 4 is a side view, FIG. 5 is a front view of the layer forming part, and FIG. 6 is a side view. 1 is a carrier. Applicant Fuji Xerox Co., Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Flood Figure 5 Figure 6

Claims (1)

[Claims] In a developing device that forms the developer supplied onto the carrier 1 into a developer layer having a predetermined thickness by a single-layer forming member and conveys this developer layer to an electrostatic latent image for development, the layer forming portion is A developing device characterized in that both ends in the longitudinal direction are in contact with the carrier l with stronger pressure than the middle part.