JPH0228533Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a protection member that protects a developing device during transportation, transportation, etc. of a copying machine.

Prior Art A developing device that develops an electrostatic latent image formed on a photoreceptor using a magnetic developer generally includes a developing device case 2 that accommodates the developer therein, as shown in FIG.
A lid 3 of the developing device case 2, a developing roller 4 that forms a magnetic brush with developer, a doctor blade 5 that is provided facing the developing roller 4 with a constant gap and regulates the height of the magnetic brush, and a developing device after development. It is composed of a perforated scraper 6 and the like that scrape off the developer attached to the roller 4.

In the above-mentioned developing device, the gap between the doctor blade 5 and the developing roller 4 is narrow, ranging from 0.1 to several mm, and is strictly adjusted because it greatly affects the quality of the developed image.

However, during the process of transporting a copying machine manufactured, assembled, adjusted, and packaged at a factory to a user, foreign matter often gets mixed into the gap between the doctor blade 5 and the developing roller 4 of the developing device. be. If the developing device case 2 is filled with developer and development is performed with foreign matter mixed in the gap,
A gap occurs in the magnetic brush formed on the developing roller 4, resulting in image defects on the image on the photoreceptor 1.

Furthermore, since the developing roller 4 has a built-in magnet so as to form a magnetic brush with the developer, there is a risk that magnetic foreign matter such as metal pieces may adhere to it during transportation of the developing device, and in this case, the same applies as above. Furthermore, foreign matter enters the gap between the doctor blade 5 and the developing roller 4, causing image defects.

Purpose The present invention has been made in view of the above points, and it is an object of the present invention to provide a protective member that prevents foreign matter from entering the developing device and protects the developing roller during transportation of a copying machine. With the goal.

Summary In order to achieve the above object, the protective member in the developing device according to the present invention includes a sheet-like member that is inserted into the gap between the developing roller and the doctor blade and that covers the exposed surface of the developing roller. , the gist is that the sheet-like member is provided removably from the developing device.

Embodiment FIG. 2 shows a developing device equipped with a protective member according to the present invention. The protective member 7 is a sheet-like member that is the same as or slightly thinner than the gap between the doctor blade 5 and the developing roller 4. One end is inserted into the gap between the doctor blade 5 and the developing roller 4 and covers the outer surface of the developing roller 4, and the other end is inserted into the gap between the doctor blade 5 and the developing roller 4, and the other end is inserted into the opening lower end 2a of the developing device case 2.
It is lightly glued to. The material of the protective member 7 is not particularly limited, but preferably a polyester film, a polymer sheet such as nylon 66, a thin sheet of metal thread, or even paper. Moreover, they do not need to be singular, and may be used in a plurality of layers.

In this way, the developing device equipped with the protection device 7 prevents foreign matter from entering between the doctor blade 5 and the developing roller 4 during transportation.
There is no possibility that magnetic foreign matter such as metal pieces will adhere directly to the developing roller 4.

When setting the developing device to a usable state, first, as shown in FIG. 3, peel off the end of the protective member 7 lightly adhered to the lower end 2a of the opening of the developing device case 2, and pull it out in the direction of the arrow. . And the fourth
As shown in the figure, the lid 3 is removed and the developer De is filled.

The protective member 7 according to the present invention can be used as a feeler gauge when adjusting the attachment of the doctor blade 5 by making its thickness the same as the gap between the doctor blade 5 and the developing roller 4. Further, handling instructions, precautions, etc. can also be written on the outer surface of the protective member 7. Furthermore, the protection member 7 can also prevent direct mechanical impact on the developing roller 4.

Effects As described above, the protective member for the developing device according to the present invention closes the gap between the developing roller and the doctor blade and covers the exposed surface of the developing roller. There are no foreign objects mixed in between the roller and the doctor blade, and no magnetic foreign objects such as metal pieces are attached to the developing roller. can be prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the general configuration of a developing device using a magnetic developer, Fig. 2 is a sectional view showing a developing device employing a protective member according to the present invention, and Fig. 3 is a sectional view showing how to remove the protective member. Perspective view showing the method and the fourth
The figure is a sectional view showing how developer is filled into the developing device. 1... Photoreceptor, 4... Developing roller, 5... Doctor blade, 7... Protective member.

Claims (1)

[Claims for Utility Model Registration] A developing roller and a doctor blade provided facing the developing roller with a constant gap in order to regulate the height of the magnetic brush of the magnetic developer formed on the developing roller. In the developing device, a sheet-like member is disposed to be inserted into a gap between the developing roller and the doctor blade and to cover the exposed surface of the developing roller, and the sheet-like member is removable from the developing device. A protective member in a developing device, characterized in that the protective member is provided in a developing device.