JPH023556Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Technical Field of the Invention The present invention relates to a dry electrostatic recording device, and particularly to the structure of a powder developing device (hereinafter referred to as a developing device).

(B) Background of the Technology In recent years, recording devices based on electrostatic recording methods have become commonplace, and most of them are dry type devices using colored toners.

However, there are problems such as poor adhesion of toner to electrostatic recording paper (hereinafter referred to as recording paper) in the developing section, and various countermeasures have been taken.

(C) Prior Art and Problems The conventional method will be explained below with reference to FIGS. 1 to 3. Fig. 1 is a configuration diagram showing an example of a dry electrostatic recording device, Fig. 2 is a side sectional view showing the structure of a powder developing device, and Fig. 3 is a state in which toner is attached to recording paper by the developing device. It is a partially enlarged side view showing.

As shown in FIG. 1, the dry electrostatic recording device uses an electrostatic recording paper 1 that can directly charge electrostatic charges to form a latent image, and uses a so-called multi-stylus 2 composed of multi-needle electrodes and a roller 3. An electrostatic latent image with a negative voltage corresponding to the image signal is created on the paper using the recording paper.

After that, feed roller 4 and pinch roller 5
The image is sent to the developing device 6 by a conveyance system composed of, etc.
The developing device 6 has a hopper 7, a sleeve 8, and a sleeve 8.
It consists of a magnet roll 9 which is fitted inside and can rotate freely, and furthermore, there is a paper guide plate 10 provided at the lower part facing the sleeve 8 at a predetermined distance. The hopper 7 contains so-called toner 11, which is a black resinous fine powder used for developing electrostatic latent images.
is accumulated, and as the magnet roll 9 rotates in the direction of arrow A, it is released from an adjustable gap called a doctor gap 12 provided between the opening of the hopper 7 and the sleeve 8. The toner 11 is sent out in the opposite direction of arrow B on the surface of the magnetic sleeve 8.

The magnet roll 12 is also called a magnetic brush,
This is an endless structure in which NS pole magnets are alternately formed on a non-magnetic rotating shaft. When this magnet roll 12 is rotated, the toner 11 is released as shown in FIG.
(10) It is charged to a potential and comes into contact with the electrostatic recording paper 1 while being attracted by the permanent magnet of the magnet roll, and slides on the electrostatic latent image 14. Since the toner 11 is charged with a polarity opposite to that of the electrostatic latent image 14, it is attracted to the negative electrostatic charge of the latent image and adheres to the electrostatic recording paper 1, turning the latent image into a visible image.

However, depending on the fluidity of the toner 11, environmental conditions, etc., the toner 11 in the hopper 7 may not fall onto the sleeve 8, and the toner 11 on the sleeve 8 may become thin, resulting in poor development. A solution to this problem is to vibrate the developing device itself, and instead of transmitting the driving force of the motor to the magnet roll 9 via a belt, it can be changed to a direct gear coupling to eliminate the vibrations that occur at that time. There is a method to utilize this method, but it has the disadvantage that the rotation speed of the developing device is 300 to 600 rpm and it generates noise.

(D) Purpose of the invention The purpose of the present invention is to solve the above-mentioned drawbacks and to provide an electrostatic recording device that can supply toner smoothly and without noise.

(E) Structure of the invention In order to achieve the above object, the invention uses a recording electrode to create an electrostatic latent image on recording paper according to the image signal, develops it using colored toner, and then transfers it to a fixing section to create a permanent image. The structure of a powder developing device of an electrostatic recording device for obtaining records, wherein a friction wheel having a concavity and convexity carved on the outer edge is provided on the magnet roll rotating shaft of the powder developing device and the magnet drive system on one side, and a friction wheel with unevenness carved on the outer edge on the other side. A friction wheel with a smooth outer edge is attached to the roller, and both friction wheels are coupled to generate vertical vibration in the powder developing material.

(F) Embodiments of the invention Examples of the invention will be described below with reference to FIGS. 4a and 4b and FIG. 5.

FIG. 4a is a side view illustrating the developing device vibration structure of the present invention, FIG. 4b is a side view showing another embodiment of FIG. 4a, and FIG. be.

In the figure, 15 is a drive motor, 16 and 16' are smooth friction wheels, 17 and 17' are toothed friction wheels, and 18 is a belt. Components with the same reference numerals as in FIGS. 1 to 3 are the same.

As shown in FIG. 4a, the vibration structure of the present invention allows the rotation of the drive motor 15 in the direction of the arrow E to be applied to a toothed friction wheel 17 made of a material such as metal or synthetic resin and having irregularities formed on the outer edge thereof through a belt 18. to communicate. Further, the rotational force is transmitted to the smooth friction wheel 16 provided in contact with the toothed friction wheel 17 and fitted onto the shaft of the magnet roll 9, thereby applying a rotational force in the direction of arrow A. Smooth friction wheel 16
is made of a material with a large coefficient of friction, such as rubber, and is configured to transmit the rotational force of the toothed friction wheel 17 through frictional force.

Because of this structure, the transmission of rotational force between the friction wheels is not smooth because one side has teeth, and as shown in FIG. It will be added to. Thus, the toner 11 accumulated in the hopper 7 due to the vibration of the developing device 6 smoothly falls from the doctor gap 12 onto the sleeve 8.

FIG. 4b shows the installation of the friction wheels of the embodiment explained in FIG. The explanation is omitted because it is completely the same as a in the same figure.

(G) Effects of the invention As explained above, in the electrostatic recording device of the invention, by applying the developer vibration structure, no noise is generated, and rotational force is applied to the magnet roll of the developer. Since it is now possible to apply vibration to the toner and the toner falls smoothly, it has become possible to prevent developing defects due to lack of toner.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an example of a dry electrostatic recording device, Fig. 2 is a side view showing the structure of a powder developing device, and Fig. 3 shows how toner is attached to recording paper by the developing device. FIG. 4A is a side view illustrating the developing device vibration structure of the present invention, FIG. 4B is a side view showing another embodiment of FIG. 4A, and FIG. FIG. In the figure, 1 is recording paper, 6 is a developer, 7 is a hopper, 8 is a sleeve, 9 is a magnet roll, 11
12 is a toner, 12 is a doctor gap, 14 is an electrostatic latent image, 15 is a drive motor, 16 and 16' are smooth friction wheels, 17 and 17' are toothed friction wheels, and 18 is a belt.

Claims (1)

[Scope of utility model registration request] It has a toner supply section and a magnet roll that transfers the toner supplied from the toner supply section onto a recording paper, and develops an electrostatic latent image formed on the recording paper according to an image signal, and a fixing section. The electrostatic recording device obtains a permanent record through a process, and the magnet roll rotation shaft and the drive system of the magnet roll are connected via a friction wheel having an unevenness carved on the outer edge,
An electrostatic recording device characterized in that the toner supply section is configured to generate vertical vibrations.