JPH02201391A - Developing device - Google Patents

Abstract

PURPOSE:To perform excellent development even at high humidity by charging a dehumidifying material at the place where carriers and a developer are mixed in the developing device across extremely small holes. CONSTITUTION:A developer mixing part 14 is formed on the reverse side of a control member 2 and the part contacting the developer 8 includes a surface which has many extremely small holes 6 which are smaller than the grain size of the developer. The dehumidifying material 5 is charged on the opposite side from the developer 8 about the surface having the extremely small holes 6 as a border. The extremely small holes 6 which are smaller than the grain size of the developer 8 are bored in an upper wall which constitutes part of the developer mixer 14 and the dehumidifying material 5 prevents the developer 8 from being solidified through the extremely small holes 6. Consequently, a defect in printing is not caused even in a high-humidity state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus, and particularly to a developing device thereof.

[Conventional technology]

Conventionally, this type of developing device did not have a structure in which a dehumidifying material was sealed inside.

[Problem to be solved by the invention]

Since the above-mentioned conventional developing device does not have a structure in which a dehumidifying material is sealed inside, there is a drawback that the developer inside the developing device solidifies under high temperature conditions, resulting in printing defects.

An object of the present invention is to provide a developing device that solves the above problems.

[Means to solve the problem]

In order to achieve the above-mentioned object, the developing device according to the present invention includes a developer rotary conveying means for supplying developer to an image carrier having a latent image formed on its surface, and a developer gA on the developer rotary conveying means. a regulating member for regulating the thickness of the thorn; and a surface formed on the back side of the regulating member, the contact portion with the developer having a large number of micropores smaller than the particle size of the developer; A developer mixing section in which a dehumidifying material is enclosed is provided on the opposite side of the developer, with the surface having the surface as a boundary as a boundary.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

In the figure, 1 is an image carrier, 3 and 4 are sleeves and mag rolls that supply the developer 8 to the image carrier 1 with a latent image formed on its surface, and 2 is a regulation that regulates the thickness of the developer 8 on the sleeve 3. It is a member. 14 is a surface formed on the back side of the regulating member 2, the contact portion with the developer 8 having a large number of micropores 6 smaller than the particle size of the developer, and a surface having the micropores 6; This is a developer mixing section in which a dehumidifying material 5 is enclosed on the opposite side of the developer 8 with the boundary being . 7 is a developer storage section, 9 is a mixer, 10 is a carrier, 11 is a transfer device, 12
1 is a transfer material, and 13 is a pair of conveying rollers.

The developer 8 stored in the developer storage section 7 is transferred to a mixer 9.
The developer is conveyed to the developer mixing section 14 while being stirred. The developer 8 is mixed with the carrier 10 on the sleeve 3 in the developer mixing section 14 . The mixed developer 8 and carrier 10 are transferred to the developing station 15 by rotation of the sleeve 3.
At this time, the thickness of the developer 8 is limited by the regulating member 2.

The thickness of the developer 8 affects the print density and is approximately 0.3 to 0.
．． 5 circles is appropriate. Further, inside the sleeve 3, a mag roll 4 rotates in the opposite direction to the direction of the sleeve 3, thereby smoothly conveying the carrier 10. The developer 8 on the image carrier 1 developed at the developing station 15 is transferred to a transfer material 12 by a transfer device 11.

In the developer mixing section 14, the developer 8 and the carrier 10 are mixed together.
However, the pressure is extremely high. Under high humidity conditions, the developer mixing section 1
4, the developer 8 solidifies, so that the sleeve 3
The supply of developer 8 to the top becomes insufficient, resulting in a decrease in density and fogging.

In the present invention, the upper wall constituting a part of the developer mixing section 14 has micropores 6 smaller than the particle size of the developer 8, and the dehumidifying material 5 is inside the micropores 6 as boundaries. The dehumidifying material 5 prevents the developer 8 from coagulating.

〔Effect of the invention〕

As explained above, the present invention removes moisture from the developer mixing area and improves the fluidity of the developer by sealing the dehumidifying material through the micropores in the area where the carrier and developer are mixed inside the developing device. This has the effect of allowing good development even at high temperatures.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention. l...Image carrier 3...Sleeve 5...Dehumidifying material 9...Mixer 2...Regulation member 4... Magroll 6...Micropore

Claims (1)

[Claims] (1) a developer rotation conveyance means for supplying developer to an image bearing member on which a latent image is formed; a regulation member regulating the thickness of the developer on the developer rotation conveyance means; A dehumidifier is formed on the back side and has a surface in contact with the developer that has many micropores smaller than the particle size of the developer, and is dehumidified on the side opposite to the developer with the surface with the micropores as a boundary. 1. A developing device comprising: a developer mixing section in which a developer is enclosed.