JPS62283362A - Developing device - Google Patents

Abstract

PURPOSE:To prevent lowering of picture quality caused by contamination of an optical system due to scattering of developer in the device by blocking upper part of a shutter and a gap between the upper part of opening of a developer container and the body when a developing device is installed to the body and the shutter is opened. CONSTITUTION:When a developing device 2 is mounted to the body 4, scattering of developer in the device from upper part of a shutter 36 and a gap between upper part 21a of a developer container 21 and the body 4 is prevented. That is, a sealing member 37 that blocks a gap between the upper part of the shutter and the container 21 when the shutter 36 is opened is provided, and a sealing member 38 is provided between upper projecting side 36a and a receiving side 41 of the body 4 that receives it. As the sealing members 37, 38, forming elastic member such as 'Everlight Moltopren(R)' etc., for instance, 'Everlight Scott HR 30(R)'. Sealing members 37, 38 are fixed to the shutter 36 or the container 21, the receiving side 41.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention A. Purpose of the Invention [Field of Industrial Application] The present invention relates to a developing device for developing a latent image formed by an electrophotographic method, an annotation recording method, or the like. Regarding.

[Conventional technology]

In recent years, image forming apparatuses that can obtain monochrome copies by replacing #i number of developing units have come into widespread use, and there are many opportunities for users to directly handle the developing units. It is necessary to prevent this.

Therefore, the present applicant has provided a sleeve shutter in the sleeve developing device, and when the developing device is attached to the main body of a copying machine or a process cartridge, the shutter is opened to make the developer conveying sleeve face the latent image carrier, and the developing device is opened. A developing device was proposed in which, when removed, the shutter is closed to close the opening of the developer container on the side of the sleeve facing the PPi image carrier (see Japanese Patent Laid-Open No. 59-2081, etc.).

[Problem that the invention seeks to solve]

In the conventional device described above, the purpose of opening and closing the opening of the developer container facing the latent image carrier with a shutter is achieved to a certain extent, but when it is installed, the upper part of the sleeve shutter is ), and the developer scatters upward from the gap.1. During copying, the optical system may be stained by 1hj, which may eventually affect the copied image.

The object of the present invention is to solve the above-mentioned problems and obtain stable and high-quality images.

Summary: Structure of the Invention [Means for Solving the Problems] The invention uses a rotating sleeve as a developer carrying and conveying member. The developing device has a structure in which the developing device is removed from the main body of the copying machine or the process cartridge, and has a jar and an opening for opening and closing the opening section of the developer container for making the sleeve face the latent image carrier. At t, the developing section δ is attached to the core body 1, and when the '-A-vine is opened 1., the upper part of the shear/9 and the developer container L-]' part and the core body are opened. 1- for sealing a gap between the developing device.

[Operation] Now, when the image device is attached to the main body and the shutter is opened,
The gap between the upper part of the machine, the upper part of the opening of the developer container, and the body is sealed to prevent the developer from scattering into the copying machine.

〔Example〕

The figure shows an embodiment of the present invention, and FIG. 1 is a cross-sectional view of the developing device attached to the main body.
Image 4LF The rotating drum 1 as f1 body is a photoreceptor in Shigeko photography, an insulator in electrostatic recording, a magnetic material in magnetic recording, etc., and is driven to rotate in the direction of the arrow. .

Hereinafter, this will be abbreviated as Dora 1. A latent image forming process machine is disposed around the drum 1, but is omitted from the drawing.

2 shows the entire area beyond the developer, 21 is a developer container, 2
2 is a developing sleeve which is a developer carrying and conveying member made of a non-central material such as aluminum; 231 is a multi-polar magnetic roller that is statically mounted in the inner space of the sleeve 22; 24 is a developing section on the sleeve 22; a regulating plate L-- for controlling the growth of the transported developer; 3. ) is an AC/DC bias Ichihara applied to the sleeve 2, and ■ is a two-component developer containing a one-component magnetic toner or a mixture of magnetic particles and toner particles.

The magnet row e23 cooperates with the plate 24 to attach the sleeve 22.
,,L: =, Nt Zenigoku 23a, which controls the 10-star Higashi-era coating, carries a latent image! - The S magnetic pole 23b, which is the developing magnetic pole facing the ram 1, the N magnetic pole 23c, which transports the developer after passing through the developing section into the container 21, and the 8S and N poles to the right of the S magnetic pole 23d are opposite depending on the polarity of the latent image. In some cases.

This core II is a permanent magnet in the comparative example, but in this case, 4t (11 stones may also be used).

When the sleeve 22 is rotated in the direction of the arrow, the magnetic particles move from the bottom of the container 21 to the direction F along the surface of the sleeve 22.
Ascent 17, blade 24, developer application ♀-control magnetic pole 2:3
The thickness of the layer on the sleeve surface is regulated by the action of step a, and the sleeve is transported to the developing section facing the photosensitive drum 1, where the latent image on the drum surface is developed by jumping. 26 is a developer pushing back member.

As the sleeve 22 continues to rotate, the developer that has not been consumed for development is collected into the container 21 by the action of the magnet 23d.

Since the above-mentioned configuration is already known as a sleeve developing device, the details thereof will be omitted.

24a is the scattering prevention 1E integrated with the plate 24.
The plate prevents the developer from scattering after passing through the blade. Reference numeral 36 denotes a sleeve shutter (hereinafter abbreviated as shutter) which, when the developing device 2 is removed from the main body 4, covers the side of the sleeve 22 facing the photosensitive drum 1 and closes the developer container. The opening 21 is closed to prevent the developer from scattering and to prevent the operator from getting contaminated with the developer.

When the developing device is attached to the main body 4, as shown in FIG. 1, the shutter 36 moves upward with respect to the developer container 21 to open the sleeve from the photosensitive drum 1. .

The opening/closing mechanism of the shutter 36 is omitted because the mechanism disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-2061 etc. is applied.
When the developing device 2 shown in FIG. 2 is removed from the main body 4, the shutter 36 is in the closed position shown in the figure. (2) and the shutter 36 are held by engaging members correspondingly provided.

When the developing device 2 in the state f is installed in the main body 4,
A corresponding member provided on the shutter 36 is guided by a member such as a guide cam provided on the main body 4, and the shutter 36 is maintained at the position shown in FIG. 1 face to face.

Then, the developing device 2 is moved until the distance forming width between the developing device 2 and the photosensitive drum l provided on the sleeve shaft 23e comes into contact with the drum 1.
When the developing device 2 is moved to the drum 1 side, the shutter 3
6 is held in the state shown in FIG. 1 by a corresponding engagement member with the main body 4.

In the present invention, in the above configuration, when the developing device 2 is attached to the main body 4, the developer is scattered into the machine from the gap between the upper part of the shutter 36, the E section 21a of the developer container 21, and the main body 4. The purpose is to prevent this.

A seal member 37 is provided to close the gap between the upper part of the shutter and the container 21 when the shutter 36 is opened in the state shown in FIG. A sealing member 38 is also provided between the housing and the housing 41.

The sealing members 37 and 38 are foamed/elastic materials such as Everite Scotto Blain, for example, Everite Scotto HR3.
Use 0. Note that the seal members 37 and 38 are the shutter 36.
or to the receiving side 41 of the container 21.

Experimental Example With the configuration shown in Fig. 1, seal members 37 and 38 were removed and to
, ooo sheets were developed, and the toner scattered upward and adhered to the lower part of the optical system dust-proof glass (not shown), resulting in a blue streak-like image. However, by installing the seal members 37 and 38, removed.

Note that 42 in the figure is a flexible plate such as Mylar film attached to the lower part of the shutter 36, and when the shutter is closed as shown in Figure 2, it comes into contact with the AC bias plate 43 at the lower part of the opening, and both 42
Prevents developer from scattering from the gap 2.43.

Further, when the shutter is closed, the bias plate 43 is swept to store the collected and adhered developer in the container.

C. In the removable and replaceable sleeve developing device with an opening/closing shutter, when the developing device is attached to the main body and the shutter is opened, the upper part of the shutter and the container and the copying machine main body or the process cartridge main body are connected. By sealing the gap between the two, the optical system will not be contaminated by developer scattering inside the machine, thereby preventing deterioration in image quality.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view when the developing device is installed, and FIG. 2 is a cross-sectional view when the developing device is not installed. DESCRIPTION OF SYMBOLS 1...Latent image carrier (photosensitive drum), 2...Developing device, 21...Developer container, 22...Developer carrying and conveying member (sleeve), 23...Magnetic roller, T. ...Developer, 36...Shutter, 37...First seal member,
38...Second seal member.

Claims (1)

[Claims] (1) A developing device using a rotating sleeve as a developer carrying conveyor is attached to and detached from a copying machine main body or a process cartridge, and an opening of a developer container is used to make the sleeve face the latent image carrier. In a developing device having a shutter that opens and closes, when the developing device is attached to the main body and the shutter is opened, a gap between the upper part of the shutter, the upper opening of the developer container, and the main body is sealed. A developing device characterized by: