JPH02101486A - Developing device for image forming device - Google Patents

Abstract

PURPOSE:To prevent fogging and soiling on a printing, and soiling the inside of the device main body by providing a sealing material, with one edge stuck to a blade and the other edge struck to the developing case, so that it comes into contact with the outside wall of a magnetic roll, which is on the other side of the sealing material. CONSTITUTION:The sealing material 7 is stuck to the developing case 2, in between the developing case 2 and the blade 6, along the outer wall of the magnetic roll 1, in a position which is equivalent to the both edges of the magnetic roll 1. The sealing material 8 is stuck with one edge on the blade 6 and the other edge on the developing case 2, so that it comes into contact with the outside wall of the magnetic wall 1, which is on the other side of the sealing material 7, in a position where it does not interfere with toner 4, which is on the magnetic roll 1. Thus the leaking of the toner in the direction of the magnetic roll axis, which could not be fully sealed by the sealing material stuck to the position equivalent to the both edges of the magnetic roll, splashing to a photosensitive body can be prevented, and by absorbing the toner by the sealing material itself, fogging and soiling of the printing and soiling the inside of the device main body can be prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image forming apparatus, and particularly to a developing device.

[Conventional technology]

Conventionally, as shown in FIG. 2, a developing device of this type of image forming apparatus includes a photoreceptor 9, a toner tank 3 equipped with an agitator 5, and a toner 4 and carrier supplied from the toner tank 3 that are charged by friction. The developing case 2 rotatably supports the magnet roll 1, and the magnet roll 1 is installed with an appropriate gap in order to regulate the supply of the toner 4 charged by the magnet roll 1. A sealing material 10 was attached to the developing case 2 along the outer periphery of both ends of the magnet roll 1 and disposed between the developing case 2 and the blade 6.

[Problem to be solved by the invention]

In the conventional developing device described above, a sealing material 10 is sandwiched between the blade 6 and the developing case 2 along the outer periphery of both ends of the magnet roll 1, and is attached to the developing case 2. There is a drawback that the toner 4 in the toner tank 3 leaks from a small gap formed between the blade 6 and the sealing material 10, causing fogging and staining of printed characters, and also staining the inside of the apparatus body with the toner.

An object of the present invention is to provide a developing device that solves the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a magnet roll that frictionally charges toner and carrier supplied from a toner tank, a developing case that rotatably supports the magnet roll, and a toner charged by the magnet roll. A blade attached with an appropriate gap between the magnet roll and the magnet roll in order to regulate the supply, and a blade along the outer circumference of both ends of the magnet roll and sandwiched between the developer case and the blade. In a developing device having a sealing material affixed to a developing case, one end is placed in contact with the outer periphery of the magnet roll on the opposite side from the sealing material at a position that does not interfere with the charged toner on the magnet roll. A sealing material is attached to the blade and the other end is attached to the developing case.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention.

In the figure, a magnet roll 1 is rotatably supported by a developing case 2. Toner tank 3 stores toner 4 to be supplied to magnet roll 1 .

Agitator 5 supplies toner to magnetic roll 1 . The blade 6 is held with a proper gap maintained between it and the magnet roll 1. The sealing material 7 is attached to the developing case 2 along the outer periphery at positions corresponding to both ends of the magnet roll 1, being sandwiched between the developing case 2 and the blade 6. The sealing material 8 is placed in a position where it does not interfere with the toner 4 on the magnet roll 1, and is in contact with the outer periphery of the magneto roll 1 on the opposite side of the sealing material 7. One end is attached to the blade 6 and the other end is attached to the blade 6. It is attached to the developing case 2. The structure of the sealing material 8 is such that the side in contact with the magnet roll 1 is a sponge 8a, and the side in contact with the photoreceptor 9 is a sliding material 8b. According to the present invention, the sealing material 7 prevents the toner 4 in the toner tank 3 from leaking from a small gap between the magnet roll 1 and the case 2, and the sealing material 8 prevents the toner 4 from leaking between the blade 6 and the sealing material. 7 prevents the toner 4 in the toner tank 3 from leaking.

〔Effect of the invention〕

As explained above, in the present invention, one end of the sealing material is attached to the blade and the other end is attached to the developing case so that the sealing material is in contact with the outer periphery of the magnet roll on the side opposite to the toner supply side at a position that does not interfere with the toner on the magnet roll. By this,
The sealing material attached to both ends of the magnet roll prevents toner that could not be completely sealed from leaking in the axial direction of the magnet roll and scattering onto the photoreceptor.
In addition, since the sealing material itself absorbs toner, it is effective in preventing fogging and staining of printed characters and staining inside the main body of the apparatus.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional developing device.

Claims (1)

[Claims] (1) A magnetic roll for frictionally charging the toner and carrier supplied from the toner tank, a developing case for rotatably supporting the magnetic roll, and a developing case for regulating the supply of the toner charged by the magnetic roll. A blade attached with an appropriate gap between it and the magnet roll, and a blade attached to the developer case along the outer periphery of both ends of the magnet roll and sandwiched between the developer case and the blade. In a developing device having a sealing material, one end is attached to the blade so as to contact the outer periphery of the magnet roll on the opposite side from the sealing material at a position that does not interfere with the charged toner on the magnet roll; A developing device for an image forming apparatus, comprising a sealing material whose other end is affixed to the developing case.