JPS60229056A - Nonmagnetic single-component developing device - Google Patents

Abstract

PURPOSE:To secure stable copy quality for a long period without causing Low I.D. even when copying operation is carried on for a long period by selecting the polarity of the frictional charging of a leveling member differently from the polarity of an electrostatic latent image to be developed. CONSTITUTION:The developer 1 in a hopper 2 is supplied onto the elastic body 4B of the leveling member 4 and a carrier 5 by gravitation, charged electrostatically by the friction between the leveling member 4 and carrier 5 and then sent to the 1st blade 3A; and a thin developer layer with specific thickness is formed by the 1st blade 3B and it is charged electrostatically by the friction between the 1st blade 3A and carrier 5. The polarity of the frictional charging of the leveling member 4 is selected differently from the polarity of the electrostatic latent image to be developed. Namely, when the polarity of the electrostatic latent image is plus, the polarity of toner used for development is minus, so fluororesin, vinyl chloride resin, etc., are used as a material having an electron attractive group. When the polarity of the electrostatic latent image is minus, on the other hand, the polarity of the toner used for the development is plus, so polyamide resin, melamine resin, etc., are used as a material with an electron donor group.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a non-magnetic component developer for developing an electrostatic image formed on a carrier in an electrophotographic apparatus into a visible image using a non-magnetic component developer. It is related to the device.

Prior art Japanese Unexamined Patent Publication No. 47-15088 and Unexamined Japanese Patent Application No. 55-1673
As disclosed in Publication No. 41, a non-magnetic component developing device is known in which a developer is sent to a holder by a holding member and a still life m@ on the holder is developed into a visible image.

The drawing is an explanatory diagram of this type of non-magnetic component developing device, in which a driver 1 and second blades 3A and 3B are fixed to both sides of an opening 2A of a hopper 2 storing a developer 1.
Below the roller 4-2, a carrier 5 carrying developer and an equalizing member 4 are provided in pressure contact with each other and are rotatable. 4, a second blade 3B is in contact with each of the second blades 3B, and a holder 7 holding the electrostatic latent image 6 facing the carrier 5 is rotatably provided,
A bias voltage in which an AC voltage is superimposed on a DC voltage is applied to the carrier 5 from a bias power supply 8.

The developer 1 is a non-magnetic component type developer, in which a polarity control agent such as a pigment such as carbon or a metal-containing azo dye is dispersed in various thermoplastic resins such as styrene resin or acrylic resin.
They are made into particles with a size of 5 to 20 microns by crushing and classification, and in some cases, hydrophobic silica' is added to the developer particles in an amount of 0.5 to 2.0 cents by weight to improve fluidity. It may also be added to.

The first blade 3A is a stainless steel plate with a predetermined thickness, which is pressed against the supporting member 5 with a predetermined contact pressure, and a thin plate with a predetermined thickness of the developer 1. The second brake r3 forms a layer and serves as a regulating member.
B is in contact with the equalizing member 4 with a linear pressure that does not cause the developer 1 to spill.

The equalizing member 4 includes an elastic body 4B on a metal core 4^ made of gold IR.
f) Due to the bonded shape, the contact surface of the carrier 5 is pressed against the surface of the carrier 5 by the pressure of VCPfr9. The cauterizing member 4 is supplied onto the elastic body 4B and the supporting body 5.
After being tribo-electrified and given an electric charge by WI rubbing with the carrier 5, it is sent to the first blade L/-P3^ (that is, the regulating member), and is formed into a thin layer of a predetermined thickness by the first blade 3. At the same time as the developer layer is formed, frictional electrification is also applied between the first blade 3^ and the supporting member 5, and an electric charge is applied thereto.

Next, the developer layer is given enough 11 rtr to enter the next state.

This developer M is sent to the holder 7 by rotating the holder 5 without applying a bias voltage to the holder 5, and becomes static due to the electric field between the electrostatic latent image 6 and the carrier 5. It flew towards the electrostatic latent image 6 and was able to use it with good electrostatic latent image. However, when copies are collected over a long period of time using such a developing device, static charges are accumulated in the uniformizing member 4), and when copies are made rapidly, the copy density gradually decreases. , D) occurred, and this resulted in f L < copy quality loss, which needed to be improved.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the problems of the prior art and to provide a non-magnetic component developer mounting which does not cause LOwl and D even when copying is performed over a long period of time.

Structure of the Invention According to the present invention, the hopper comprises a hollow/4'-- which stores one scoop of non-magnetic toner, a carrier which receives and conveys the toner from the hollow/arm, and the hopper. A non-magnetic component developing device comprising: a regulating member that forms the toner in a thin and uniform layer on the carrier; and a uniformizing member that comes into pressure contact with the carrier and uniformizes the toner layer on the carrier. In,
The diaphragm polarity of the homogenizing member is selected to be opposite to the polarity of the Silence II latent image to be developed.

EXAMPLE Next, the present invention will be explained in detail with reference to an example of the present invention based on the accompanying drawings. The external structure of the developing device implementing the present invention is the same as that of the conventional one. DESCRIPTION OF THE PREFERRED EMBODIMENTS A complete description of the embodiments of the invention follows with reference to the same accompanying drawings.

In the non-magnetic field-component imaging device shown in the accompanying drawings, according to the invention the M collar band'i polarity of the homogenizing member 4 is selected to be opposite to the polarity of the electrostatic m image to be developed.

That is, if the polarity of the σ image is positive, then V is,
Since the polarity of the toner used in the IA image is negative, the polarity of the friction band 1 of the equalizing member 4 is preferably selected to be negatively charged with respect to the toner so as to neutralize this polarity. As the material for forming the homogenizing member 4, materials having electron-withdrawing groups such as fluorocarbon resin, vinyl chloride resin, polyolefin resin, chlorostyrene resin, epoxy resin, etc. can be used. If the perseverance of is negative, VC is
Since the polarity of the toner used for development is positive, the frictional charging and polarity of the equalizing member 4 should be selected so that the toner is positively charged in order to neutralize this. As the material for forming the chemical member 4, polyamide resin, melamine resin, polyurethane resin, acrylic resin, etc., which are materials having electron-donating groups, can be used.

As an embodiment of the present invention, a holding body 7 for holding a static W latent image storage and a Se-based P ram are used in a current storage lid having a structure similar to that shown in the drawing with C. The VC was set to have a surface potential of exactly 900 V, a roll body made of fluororesin was used as the equalizing member 4, and settings were made to develop a static 1 fm image with the same fineness as the conventional device described above. I collected about 10n, 000 copies, but it was Low.
1 and D never occurred.

Effects of the Invention In accordance with the present invention, the polarity of the friction band 11 of the equalizing member is set to be opposite to the @ property of the electronic image to be developed. To prevent low and D from occurring even when copying is performed over a long period of time, to ensure a stable copy quality of 5R over a long period of time, and to eliminate the need for maintenance. I can do it.

[Brief explanation of drawings]

The accompanying drawing is a schematic illustration of an example of a non-magnetic component developing pupil. 1... Toner, 2... Hopper, 3^... Regulating member, 4... Uniformizing member, 5... Carrier, 6... Electrostatic, latent image -7... Holding Body, 8...Development bias power supply.

Claims (1)

[Claims] a hopper that stores non-magnetic monocomponent toner; a carrier that receives and conveys the toner from the hopper;
A non-magnetic device comprising: a regulating member that forms the toner from the hopper into a thin and uniform layer on the carrier; and an equalizing member that is in pressure contact with the carrier and uniformizes the amount of toner on the carrier. In the component developing device, the polarity of the homogenizing member is selected to be opposite to the polarity of the surface to be developed. .