JPS5978377A - Developing device of multicolor recording device - Google Patents

Abstract

PURPOSE:To prevent the clogging of carriers by providing a blocking plate which prevents the developer of another development part moved from on an electrostatic latent image to on a sleeve from entering a developing device. CONSTITUTION:A blocking plate 16 which prevents carriers 17 moved from the surface of a recording drum 1 to the surface of the outer circumference of the sleeve 13 from entering the 2nd developing device 6 is provided on the outer circumference of the downstream-sleeve 13 at the part facing the recording drum 1. The blocking plate 16 and sleeve 13 are disposed at a proper interval for preventing the carrier 17 from entering the inside corresponding to the grain size of the carrier 17. Thus, the blocking plate 16 is provided to prevent the carrier 17 which is conveyed from the 1st developing device while sticking to the sleeve 13 from entering the 2nd developing device, and no clogging is therefore caused on the rear surface of a doctor blade.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The invention relates to a multi-color electrophotographic recording device and relates to an improvement of a developing device thereof by X%. (2) Background of the Technology The configuration of an electrophotographic two-color recording device is shown in FIG.

Along the surface of the recording drum l rotating in the direction of the arrow, there is a corotron 2 for uniformly charging the drum surface, and a corotron 2 that irradiates light in the direction of arrow B according to the image to be recorded to create a first image. A first exposure container 3 for forming a latent image, a first developing device 4 for developing a first latent image, and an arrow C according to an image to be recorded.
a second exposure device 5 for forming a second latent image by irradiating light as shown in FIG. 6, a transfer corotron 7 for transferring the toner 'IIJt developed on the recording drum 1 to the recording paper 11, a static eliminating corotron 8 for eliminating the residual toner on the recording drum 1, and a static eliminating corotron 8 for eliminating the residual toner on the recording drum 1; A cleaner 9 for discarding waste and a charge removal lamp 10 for removing charge from the surface of the recording drum 1 are provided.

The development firmness of the entire i'fP latent image is generally achieved by using toner made of a non-magnetic material and the action of a magnetic roller. 7. A two-part preparation agent is used, which is mixed with Gearia, which is composed of the primary iron of the two-color recording device. To prevent the destruction of the upper toner (1), scraping off (2) of the toner, or the drawing of the toner on the drum into the second developer, it is used on the l-component magnetic toner developer (2) that does not contain any liquid. The authors have proposed a color recording method. However, even in a developing device using such an l-component developer, variations in the contact depth between the toner and the recording drum caused by misalignment of the second developing device, surface potential of the recording drum, development bias, etc. The toner of the first developer may get mixed into the second developer due to potential fluctuations.

In addition, if the contact interval between the magnetic roller of the first developing device and the recording drum is inappropriately set, or if the initial charging potential is still too high, the carrier of the first developing device will not reach the recording drum. Arrive at the top. The carrier that has landed on the recording drum is attracted by the magnetic roller of the second developing device, transferred to the second developing device, and mixed into the one-component disk of the second developing device. Key 9 is iron powder with a grain size of 100 to 300 μm, and when mixed into the second developing device, the desired gap (100 to 1
50 μm). When such clogging occurs, the magnetic toner is not uniformly supplied, resulting in white spots and the like on the recorded image, which prevents good recording.

(3) Prior art and problems In the developing device of a conventional two-color recording device, in order to deal with the deterioration of recording quality and the deterioration of color freshness due to the contamination of carrier into the second developing device or the transfer and adhesion of toner of a different color, etc. The one-component developer in the second and first developer was frequently replaced, and the surface of the sleeve of the developing roller was manually cleaned each time.

Such maintenance work is troublesome and also wastes the processing material.

(4) Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks of the prior art. 1st
It is an object of the present invention to provide a developing device in which toner in a developing device can be easily removed and recovered.

(5) Structure of the Invention In order to achieve this object, the present invention uses a sleeve and a developing roller, which is a magnetic roller installed in the sleeve, to apply a developer onto the static latent image and develop it using a plurality of developing units. A dust device for a multi-color recording device having a dust transfer device from the top of the 1j1 Denryu 1 ice onto the sleeve on the first stream side of the part facing the electrostatic image with respect to the flow direction of the developer on the sleeve. A blocking plate is provided to prevent developers from other developing sections from entering the imaging device.

(6) Embodiment of the Invention FIG. 2 is a block diagram of a developing device (second device) according to the present invention. This second developing device 6 vibrates the magnetic roller 12 and the sleeve 13 disposed around its outer periphery.
When 2 is rotated in the direction of the arrow, the magnetic toner 14 moves on the sleeve 13 in the direction of arrow E due to the magnetic action of 7.

On the outer periphery of the sleeve 13 on the upstream side of the pair 11 with the recording drum 1 rotating in the direction of the arrow A, there is an IJI for the recording drum l.
A doctor blade 15 is provided to increase the thickness of the magnetic toner 14 by t>q. Also, on the outer periphery of the sleeve 13 on the first stream side of the adhesive surface with the recording drum 1, the carrier 17 transferred from the recording drum 1 onto the sleeve 13 is prevented from getting mixed into the second developer 6. A blocking plate 16 is provided for blocking. The distance between the blocking plate 16 and the sleeve 13 is set to a distance corresponding to the grain size of the carrier 17 to prevent intrusion into the inside of the carrier 17. By providing such a blocking plate 16, the carrier 17 from the first developing device attached to the sleeve 13 is transferred to the second developing device. There are no nine people inside the image device, so there is no chance of damage caused by the carrier on the back of the doctor blade 15. The outer periphery of the sleeve 13 is further provided with a shutter 18 for stopping the flow of the movable magnetic toner 14 as indicated by an arrow F.

As shown in FIG. 3, the blocking plate 16 may be rotated "p" north in the direction of arrow G, and the distance from the sleeve 13 may be variable. With this configuration, by periodically bringing the blocking plate 16 into contact with the sleeve 13 and rotating the sleeve 13 in the direction of arrow H, carriers with small particle diameter stuck on the sleeve 13 are removed and the collection box is removed. It can be accommodated within 19. At this time, if the flow of the magnetic toner 14 is stopped by the shutter 18, the magnetic toner 14 will not be removed by the blocking plate 16, thereby preventing wasteful collection of the magnetic toner.

As another means of recovering the carrier 17, as shown in FIG. It may be stored in the grape collecting tray 19.

FIG. 5 shows a configuration in which it is possible to remove the non-magnetic toner of the first generation device stuck to the soil of the sleeve 13 of the second visualization device 6 by using such a means of the base stopper plate 16. 〃) et al. 8th
Based on the diagram - C congratulations. The base stop plate in this case is substantially constituted by the rubber blade 21. A suction port 20 connected to the suction duct 20 on the top surface of the rubber grade 21
a is provided. Non-magnetic toner 22 transferred from the recording drum 1 onto the sleeve 13 (d47 FIG. 9 shows the magnetic roller 1)
2 rotates in the direction indicated by the arrow, it does not move because it is non-magnetic and remains stationary on the sleeve 13. When the rubber blade 21i connected to the suction duct 20 mentioned above is inserted, it is placed so far away from the sleeve 13 that it is separated from the sleeve 13 so as to prevent the passage of the carrier, as in the case of the previous embodiment, to prevent the carrier from entering inside. do. When the non-magnetic toner 22 reaches a certain amount on the sleeve 13, the magnetic toner 18 is brought into contact with the sleeve 13 to stop the flow of the magnetic toner 14 and remove the magnetic toner from the non-magnetic toner coated layer of the sleeve 13 (7th
In this state, if the rubber blade 21 is moved in the direction of the arrow Q to contact the sleeve 13 and the sleeve 13 is further rotated in the direction of the arrow H, the non-magnetic toner 22 adhering to the soil on the sleeve 13 will be removed by the suction duct 20. It is removed by suction as shown by arrow P.

(7) As described in detail of the invention, the desk device according to the present invention is provided with a blocking plate that prevents the carrier from entering the inside of the developing device. This prevents the carrier from being mixed with the carrier, thereby preventing deterioration in recording quality due to clogging, and shortening the developer replacement cycle, which simplifies maintenance work and eliminates waste of developer. The shutter 1 is provided with variable spacing relative to the sleeve on the stop plate.
By providing a suction duct or the like, it is possible to remove non-magnetic toner of a different color from the first developing device that has landed on the sleeve, making maintenance of the current device easier.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a two-color recording device to which the present invention is applied, FIGS. 2 to 4 are block diagrams of different embodiments of the recording device according to the present invention, and FIGS. 6 is a front view and a side view of an example of the blocking plate according to the present invention, and FIGS. 7 and 8 are explanatory diagrams showing the different 01 usage conditions of the blocking plate in FIG. 5, respectively. It is. 1... 61ru toge drum, 4... 1st developer, 6...
・Second generation. Imager, 12... Magnetic roller, 13... Sleeve, 1
4...Magnetic toner, 16. Blocking plate, 17... Carrier 20. Suction duct, 21... Rubber grade. Figure 2 Figure 3 19 Figure 5 Figure 7 Mouth Figure 4 Figure 7 9 2, each 6 Mouth writing 8

Claims (1)

[Claims] 1. A developing device for a multi-color recording device having a plurality of developing sections that performs development by depositing a developer on an electrostatic latent image using a developing roller consisting of a sleeve and a magnetic roller installed in the sleeve, which comprises: Regarding the flow direction of the developer on the sleeve, the developer of another image transferred from the electrostatic latent image onto the sleeve mixes into the inside of the developing device at the lower σCl1ll of the part facing the electrostatic image. f: A developing device of a multi-color recording device characterized by the provision of a blocking stop = 1 to prevent this.