JPS5854387B2 - Seiden Kazougenzou Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic copying machine, etc., which visualizes an electrostatically charged latent image by attaching developer particles to the developing surface of a developing medium having an electrostatically charged latent image. This invention relates to an electrostatic image developing device used for.

As a conventionally known developing device of this type, there is a developing device using a magnetic brush developing method.

The disadvantages of this developing device are that the brush rubbing against the surface to be developed causes contamination of the surface to be developed, that a drive mechanism is required to move the permanent magnet, which increases the size of the device, and that it is difficult to replenish the toner. These problems include the fact that it takes time for uniform mixing with the carrier agent afterwards.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrostatic image developing apparatus that does not have the disadvantages of conventional magnetic brush developing apparatus.

Hereinafter, details of the present invention will be clarified by examples shown in the drawings.

FIG. 1 is a block diagram of an electrophotographic copying machine which is an embodiment of the present invention, in which electrophotographic copying is carried out along a path from charging device 1 to exposure device 2 to developing device 3 to transfer device 4 to static elimination cleaning device 5. Which indicates that.

FIG. 2 is a diagram showing a specific example of the developing device 3, in which the permanently magnetized developer 10 in the developer reservoir 9 is magnetically attracted and attached as the magnetic belt 14 moves, and is transported to the developing section A. It will be done.

In the developing section A, an alternating magnetic field generated by an electromagnet 15 disposed close to the lower surface of the magnetic belt 14 causes the developer particles 10 on the belt to rotate and jump to form a smoke layer.

By bringing the medium 6 to be developed having an electrostatic latent image into contact with this smoke layer, developer particles 10 are electrostatically attracted and attached to the charged portion 8, and development is performed.

When the developer particles 10 reach a place where the alternating magnetic field is weak while forming a smoke layer, they are magnetically attracted and captured by the belt surface again, scraped off by the scraper 16, returned to the developer reservoir 9 again, and then returned to the belt after being regenerated. 14 and used for the next development.

Note that the belt 14 is moved by rollers 11, 12, and 13.

If the electromagnet 15 generates a rotating magnetic field or a moving magnetic field, the developer particles 10 can be moved in any direction.

The maximum moving speed was 5C1n/sec.

FIG. 3 shows another embodiment, from box 17 to hopper 18.
The toner is replenished through the developer reservoir 9, and an electromagnet 19 disposed at the bottom of the developer reservoir 9 generates an alternating magnetic field to stir and reproduce the toner.

FIG. 4 shows yet another embodiment, in which the toner from the hopper 18 is supplied to the belt surface by a magnetic roller 20, and the toner after development is readjusted by the magnetic roller 20.

FIG. 5 shows yet another embodiment in which the magnetic belt 14 and the developing medium 6 are vertical, so as to impart potential energy to the particles.

As explained above, according to the present invention, the permanently magnetized developer particles form a smoke layer while rotating and jumping in synchronization with each other due to an alternating magnetic field, so that latent images that come into contact with the smoke layer are formed. The surface has the advantage that good development can be done in a short time, and the degree of contamination of the surface to be developed is extremely small.

Furthermore, since the particles are transported by a magnetic belt,
The amount of particles in the smoke layer can always be kept constant, and good development can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a diagram showing a developing device of the same embodiment, and FIGS. 3 to 5 are diagrams showing other embodiments of the developing device. 3...Developing device, 14...Magnetic belt, 10...Developer particles, A...Developing section.

Claims (1)

[Claims] 1. A holding part that accommodates and holds the permanently held developer particles, an endless magnetic belt that conveys the developer particles in this holding part while being attached to the surface, and a part of the belt that is close to the back surface. an electromagnet which is arranged to apply an alternating magnetic field to the developer particles on the belt to cause the particles to rotate and jump to form a smoke layer; and an electromagnet having an electrostatic latent image on the smoke layer formed by the electromagnet. An electrostatic image developing device comprising: a developing medium moving device that causes developer particles to adhere according to the charge pattern of an electrostatic latent image by moving the medium while making contact with the medium.