JPS59155864A - Toner collecting device of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To reduce a variation of a collecting toner mixing ratio, and to improve a picture quality by bringing a discharge port of a collecting and carrying means nearer to the side wall opposed to a toner box side wall positioned in the rotating direction of a dispense roll of a toner box bottom part. CONSTITUTION:When a dispense roll 12 of the bottom part of a toner box 11 rotates in the direction as indicated with an arrow A, a toner T contacting with a dispense roll 12 at a position which is near the lower end part of a side wall 11a follows the roll 12, is carried to the lower end part side of a side wall 11b, and discharged to the side of a developer stirring tank 13. Therefore, a collected toner is discharged through a discharge port 8a from a dust collecting device, and thereafter, flows downward smoothly as indicated with an arrow B, mixing with a new toner. Accordingly, the collected toner does not stay in the toner box 11, a variation of a collected toner quantity in a developer is reduced, and a stable picture having no surface fog is obtained at all times.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a toner recovery device for an electrophotographic copying machine that uses a two-component developer. The invention relates to a technique for supplying developer to a stirring tank without any problem.

In a copying method using a conventional electrophotographic process, first, in a dark place, a uniform electric charge is applied to the surface of a photoreceptor, in which a photoconductive insulating film is placed on a conductive support, and then the copying process is performed. An image is formed by projecting the original 11 local image on the surface of a photoconductor, and then absorbing this electrostatic image 1c+/nano to obtain a toner image, which is then transferred to paper and subjected to fixed casting. It is.

Incidentally, although the toner G on the photoreceptor is not 100% transferred to the paper, unless the residual toner is removed by cleaning, it will not be possible to obtain a good quality image in the next copying process.

＋ノT、＝METSU：9'】--- As a means of linking, there was one that existed for 1 month. In the furan cleaning device, a rotary flange is brought into contact with the surface of the rotating photoreceptor drum, and the residual lubricant is scraped off by the flan, which is then drawn out by the flow of air. The drawn out toner C is collected by the cyclone filter dust collector 01 (see Figure 1),
The toner is taken out one by one as the rotary valve o2, which has a plurality of flades 03 arranged at its lower part, rotates, and is continuously discharged to the toner box o5 of the developing device by the auger 04, which is a screw set conveyor. , will be recovered.

However, there is a problem depending on where in the toner box 05 the discharge port 04a of the auger 04 is placed.

That is, in the conventional device, the discharge port 04. A is placed in the center of the toner box 05 (see FIG. 2) or near the side wall 05a. The reason why it was placed in the center was to spread it evenly over the surface layer of the recovered toner vinyl toner, and the reason why it was placed near the side wall 05a was to distribute the toner in the toner bolus O5 evenly. As the supply roll (hereinafter referred to as the dispense roll) 06 rotates (in the direction of the arrow), the developer is discharged from the lower end of the side wall 05a into the developer stirring tank. This is because they thought that it would be possible to discharge them smoothly.

However, when we closely observe the behavior of the toner T in the toner bolus o5, we find that the toner T sinks toward the side wall 05b facing the side wall 05a located in the rotational direction of the dispense roll o6, as shown in FIG. I understand. This is because the toner T that comes into contact with the dispense roll 06 on the side wall 05b side moves along with the rotation of the dispense roll 06 and is preferentially discharged into the developer stirring tank.

Therefore, when the collected toner is not discharged smoothly and accumulates in the surface layer VC, the collected toner is intensively discharged into the developer stirring tank.

When JDi <, the recovered toner of opposite polarity increases in the developer and the conversion rate of new toner decreases, the background fogging phenomenon on the photoreceptor surface occurs during development, that is, the background part other than the electrostatic layer image area A phenomenon occurs in which the toner is layered, making it impossible to obtain high-quality copies. Moreover, due to the background smearing phenomenon, the cleaning device removes the toner from the cleaning device.
Object of the Invention The present invention was devised against the technical background of JG, and its purpose is to accumulate collected toner in a toner box. The main feature is that the developer can be smoothly discharged into the developer stirring tank without causing any problems.

Structure of the Invention The toner collection device of the present invention is capable of collecting toner particles (toner particles remaining on the surface of a photoreceptor).
・The upper part of the collecting and conveying means υ11 for cleaning the toner with the cleaning device and collecting it in the toner box is located on the side wall opposite to the side wall of the toner box located in the rotational direction of the dispense roll at the bottom of the toner box. It is said that

With this configuration, the recovered toner fed into the toner box from the discharge port of the recovery conveyance means is fed into the toner box f: 'If box (1
Smoothly discharge the developer into the developer stirring tank without mixing it with the new toner.

3L Straight 1 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

6 around the photosensitive drum 1 in an electrophotographic copying machine.
A charging device, an exposure system, a developing device 10, a transfer device, and a cleaning device 2 are arranged in a normal layout. Although the toner image on the photoreceptor drum 1 is transferred to paper in the transfer process, the transfer is not necessarily 100%; there is a layer of residual toner on the surface of the photoreceptor after the transfer. This residual toner is removed by a cleaning device 2.

In the cleaning device 2, the flan roll 3 scrapes the
The picked up residual toner is conveyed with the air flow to the cyclone filter dust collector 6 through the cleaner duct h 4 and the connecting duct 5 . In the dust collector 6, the toner C is separated from the air flow and settles downward. In this way, the recovered toner deposited at the bottom of the cyclone filter dust collector 6- is removed by the rotation of the rotary valve 7, similar to the device shown in FIG. The discharge port 8a of the storage auger 8 is provided close to the surrounding wall 11a of the toner box 11.
1alt, it faces the side wall 11b located in the rotational direction (direction of arrow A) of the dispense roll J2 disposed at the bottom of the toner hook 11 (see FIG. 4).

On the other hand, the toner in the toner box 11 flows into the developer stirring tank 13 as the dispensing roll 12 rotates.
Jl, come out. Stir and mix with the magnetic gear by the rotation of the friend 14. The developer, in which the carrier and toner are mixed in a proper ratio, is transferred to the magnetic roll 161 by the rotation of the paddle wheel] 5! 11 and further conveyed to the image area on the photoreceptor drum 1.

However, when the dispense roll 12 rotates in the six directions of the arrows in FIG.
'MP dispense roll 12 iC +
Since the collected toner is carried to the lower end side of the container b and discharged to the developer stirring tank 13 side, after being discharged from the discharge port 8a,
Flow smoothly downward as shown by arrow B while mixing with the new toner. Therefore, the collected toner does not accumulate in the toner hox], and fluctuations in the amount of collected toner in the developer are reduced as much as possible, and stable images without "background fog" can always be obtained.

It should be noted that although the non-embodiment will be described with reference to a magnetic plan developing device, it goes without saying that the invention can also be applied to a cascade developing device.

As is clear from the above explanation, the present invention provides a collection and conveyance means for cleaning l-toner remaining on the surface of the photoreceptor with a cleaning device and collecting it in a toner box. Since the control port is placed on the side wall opposite to the toner hook σ) side wall located at the bottom of the toner box in the rotation direction VC of the dispense roll, the collected toner is mixed with new toner without stagnation and is smoothly developed. be discharged into the mixing tank. Therefore, there is little variation in the mixed ratio of recovered toner in the developer, and stable, high-quality images can always be obtained.

[Brief explanation of drawings]

No. 11 KI is an explanatory diagram of main parts of a known residual toner collecting device with two positions, FIG. FIG. 4 is an enlarged view of the main parts of a PW secondary photocopying machine equipped with a recovery device. 1. Photosensitive drum, 2. Cleaning device, 3.
...Fran roll, 11・Cleaner duct, 5
...Connection duct, 6..Cyclone filter dust collector, 7.Rotary valve, 8..Ocher, 1.
0.Developer, 11...Toner box, 12...Dispense roll, 13...Developer stirring tank, I4...Flender, 15, , , tz dollar poil, ]6.
...Magnetic roll. Agent: 1 person, Nozomi Ehara, Figure 1, Figure 2

Claims (1)

[Claims] Cleaning device a removes I/ner remaining on the surface of the photoreceptor.
The toner is cleaned and collected in a toner box using a collecting and conveying means, and is supplied to a developer stirring tank along with new toner in the toner box by the rotation of the toner supply roll at the bottom of the toner box. In the electrophotographic copying machine equipped with
A toner recovery device characterized in that an outlet is shifted in the rotational direction of the toner supply roll and placed on a side wall opposite to a side wall of the toner 71ζx.