JPS6177877A - Developing machine of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To permit the replenishment of a toner from an optional position by providing a partition wall having a spacing from a casing behind a developing roll and providing an upper auger and lower auger above and below the partition wall. CONSTITUTION:The developing roll 2 is provided in the casing 1 in proximity to a photosensitive body 3. The two upper and lower augers 4, 5 are provided behind the roll and rotate in the directions opposite from each other. The upper auger 4 conveys the developer 8 on the partition wall 6 toward the right and the lower auger 5 conveys the developer 8 in the bottom of the casing toward the right and left. There is the spacing 12 at the end of the wall 6 and the developer 8 moving on the wall 6 falls to the bottom of the casing. The developer 8 moving in the bottom of the casing is forced up onto the wall 6 through the spacing 12 at the other end. The developer agitated in the above-mentioned manner moves curvilinearly and therefore the toner is made to distribute uniformly in the developer and the toner replenished from any position is satisfactorily mixed with the developer.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic brush developing machine for an electrophotographic machine.

[Conventional technology]

In general, in electrophotography, a method such as the one shown in Figure 3 is used.
A magnetic brush is used to convey the developer 8 from the lower side to the upper developing roll 2I, and the surface of the photoreceptor 3 is rubbed with this magnetic brush, thereby forming an electrostatic latent image on the photoreceptor. is being developed. In this type of device, when the toner concentration decreases, the toner is dropped from the toner cartridge 13 provided above the developing machine into the developing machine by a dispenser 14 to replenish the toner, but the toner density is kept uniform in the axial direction. To achieve this, it is necessary to form the toner cartridge 13 to have a size approximately equal to the entire length of the developing roll 2.

Therefore, the mounting position of the toner cartridge 13 is limited to the upper part of the developing machine. The developing machine is also equipped with a blender 15, a paddle wheel 16, etc. so that the toner cartridge can be uniformly mixed into the developer quickly after passing through the toner cartridge dispense roll 14.

As a result, the developing machine becomes large and requires an expensive paddle wheel, resulting in an increase in cost.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to ensure that when toner is replenished, the toner is well mixed with the developer, and that the toner is further agitated at a low cost and in a small size.
It is an object of the present invention to provide a developing machine that can produce this.

[Means and effects for solving the problems] The present invention has the following features:
This is an electrophotographic developing machine in which a partition wall having a gap with the casing periphery is provided behind the developing roll, and an upper auger and a lower auger are rotatably provided above and below the partition wall. That is, the present invention is a developing machine having two augers, the partition wall provided between them has a chute for causing the developer to fall backward, and the partition wall also has a chute for causing the developer to fall backward. It is arranged with a gap between it and the casing so that the water can be circulated.

The auger has a function of transporting the developer, and the upper auger and the lower auger transport the developer in opposite directions. The gap around the partition wall is a passage for the developer to fall from the partition wall, and a passage for the developer to be pushed up from the bottom of the casing. The developer that has moved over the partition wall from the upper auger pot falls from one end of the partition wall to the bottom of the casing, is moved across the bottom in the opposite direction by the lower auger, is pushed upward from the gap at the other end of the partition wall, and moves on the partition wall again. do. Further, the developer on the partition wall also falls from the shooter, and the developer at the bottom of the casing also moves toward the developing roll. As the developer circulates through the developing machine by repeating these movements, the developer is sufficiently agitated, and a portion of the developer constantly adheres to the developing roll, ensuring that toner is evenly supplied to the developing roll. .

〔Example〕

An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a sectional view of the developing machine of this embodiment, and FIG. Inside the casing l, a developing roll 2 is provided close to the photoreceptor 3, and behind it, that is, in the opposite direction from the photoreceptor 3, two augers 4.5 are provided, upper and lower, which are in contact with each other. Rotate in the opposite direction. In FIG. 1, the upper auger 4 rotates counterclockwise, and the lower auger 5 rotates clockwise. A partition wall 6 is provided between the upper auger 4 and the lower auger 5, and this partition wall 6 has a receiving part 9 that receives the developer 8 regulated by the trimmer 7 from above the developing roll 2, and a casing for the developer 8. It is equipped with a shooter 10 for guiding the ball to fall to the bottom. A gap 12 is provided between the shooter 10 and the casing 1. As is clear from Figure 2, the upper auger 4
The upper auger 4 and the lower auger 5 each have a spiral portion 11 inclined in the same direction, and when rotated in the direction shown by the arrow in FIG. , the lower auger ~5 transports the developer 8 at the bottom of the casing to the left. On the other hand, there is a gap 12 between the end of the partition wall 6 and both side surfaces 1 of the casing, and the developer 8 moving on the partition wall 6 falls to the bottom of the casing through the gap 12 at one end and moves on the bottom of the casing. The developer 8 is pushed up onto the partition wall 6 through the gap 12 at the other end of the partition wall 6 . In this way, the developer 8 inside the casing l is
It circulates like +D→E.

Furthermore, since the augers 4 and 5 convey the developer 8 in the peripheral direction f while rotating, the developer 8 on the partition wall 6 is conveyed onto the chute 10 by the upper auger 4, as shown by the arrow in FIG.
Shooter 101-5: falls in the direction of . Similarly, the developer 8 at the bottom of the casing is conveyed to the developing roll 2 by the lower auger 5.

The developer that is stirred in this way does not move in a flat direction but in a curved manner, so when toner is replenished, the toner is evenly distributed in the developer, and the density in the horizontal direction is also uniform. become.

Therefore, the toner is well mixed with the developer no matter where you replenish the toner, so you can install the toner cartridge in any position and replenish the toner evenly in the axial direction. It is not necessary to replenish the fuel at any position (for example, the position indicated by arrow G).

Effects of the Invention According to the present invention, since the developer is stirred extremely well, there are no restrictions on the shape or mounting position of the toner cartridge for replenishing toner, and toner can be replenished from any position. .

Furthermore, since the developer can be well mixed and supplied to the developing roll without the need for a blender or paddle wheel as in the past, it is possible to downsize the developing machine and reduce manufacturing costs. .

[Brief explanation of the drawing]

WJ1 and FIG. 2 are cross-sectional views of the developing machine of the present invention, and FIG. 3 is a schematic diagram of a conventional developing machine. Codes in the figure: 1.1g...Casing; 2...Developing roll; 3.
...Photoreceptor; 4...Upper auger: 5...Lower auger: 6...Partition wall; 7...Trimmer: 8...Developer:
9... Receiving part: lO...7 user: 11... spiral part; 12... gap; 13... toner cartridge; 14... dispensing roll: 15... blender: 16. ...paddle wheel. *1f! ! ff 121! f third
figure

Claims (1)

[Claims] A developing machine for an electrophotographic machine, in which a partition wall having a gap between the developing roll and the periphery of the casing is provided behind the developing roll, and an upper auger and a lower auger are rotatably provided above and below the partition wall.