JPS597983A - Carrier removing device of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To prevent damage of a photoreceptor and to obtain a ruggedness-free copy on a copying surface by cleaning carrier on paper with a brush right in front of the contacting place of the photoreceptor. CONSTITUTION:A carrier removing device body 21 is formed by implanting the conductive brush 23 in the lower part of a conductive holder 22 and has a permanent magnet at the body part. The magnet 24 is attracted to a device frame 25 and connected to an enclosure earth 26 through the frame 25, and the brush 23 is brought into contact with copying paper 7 right in front of where the copying paper 7 contacts the photoreceptor 6. A developer falling through the gap between a developing device and the photoreceptor 6 is collected almost entirely by a collecting plate and part of it falls on the copying paper 7. Thus, carriers 3b in the developer falling on the copying paper are carried to right below the brush 23 accompanied with the movement of the copying paper 7 to be cleaned by the brush 23. Further, the brush 23 is magnetized by the permanent magnet 24 and the carriers are acquired securely by its magnetic force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carrier removing device for an electronic copying machine, and more specifically, it relates to a carrier removing device for an electronic copying machine using a two-component developer.
This invention relates to a device for removing carriers that are scattered on 1-Piece paper sheets.

FIG. 1 shows a developing machine of a general two-component developer type electronic copying machine. In this developing machine 1, a two-component developer 3 is discharged from a toner 3a and a carrier V31) in a developing machine case 2.
is conveyed along a developing sleeve 5 to a rotating photoreceptor 6 using the magnetic action of a magnet [1-4], where development is performed to form a toner image on the photoreceptor 6. The photoreceptor 6, on which the toner image has been formed in this way, further rotates in the direction of the arrow, meets the copy paper 7 below, and
A transfer corotron 8 transfers the toner image on the photoreceptor 6 onto copy paper 7. This copy paper 7 further passes through a fixing device (not shown) and is discharged onto a tray or the like.

Note that the remaining developer 3 after the above-mentioned development falls down to the paddle 9 along the bottom of the developing machine case 2. The remaining developer that has reached the paddle 9 is agitated and adjusted to the C specified concentration by the toner 3a newly supplied via the toner supply roll 10, and is again moved onto the developing sleeve 5 by the magnet roll 4 onto the photoreceptor. It is transported up to 6.

However, in such an electronic copying machine, the current IFM 1 is positioned to the side of the photoconductor 6 due to its function, and the #i17 for copying is moved under the developing machine case 2 to the bottom of the photoconductor 6. A configuration in which it is transported is adopted. Therefore, in such an electronic copying machine, the photoreceptor 6
The developer 3 remaining in the developer 1 Uffi falls onto the copy paper 7 through the gap B between the developer 3 and the carrier \731), which may damage the surface of the photoreceptor 6. Therefore, various measures have been developed to prevent this.

As an example of a countermeasure, if the 21-layer is formed of a magnetic material, a magnet seal is placed at the end of the developing machine case 2 on the side of the photoreceptor 6. There is also a device that captures the hair that is trying to pass through the gap B with the body 6, but in this type of device, the carrier stacks J(i) on ten magnetic seals and the first = V rear may disturb the toner image on the photoreceptor 6.As another example, as shown in FIG. Gap B between developing machine case 2 and photoreceptor 6
There is also one that collects developer that falls from. Although such a device does not have the same problem as the above-mentioned key storage device, it does not prevent the developer falling from the gap B between the current 4'tξ+jM'r- space 2 and the photoreceptor 6 from being caught by the -1- It is not possible to collect everything with 11, and some of them are caught with catch pan 1.
1 and fall onto the copy paper 7, completely preventing damage to the surface of the photoreceptor 6 caused by the above-mentioned photoreceptor 1.
I couldn't do it. d-3, the gear on the copy paper 7 is removed after copying is completed.
These are the factors that cause the surface to become rough.

The purpose of the present invention is to solve these problems and to completely remove the developer, especially the developer that falls onto the copy paper, and
It is an object of the present invention to provide a carrier removal device for an electronic copying machine which can thereby prevent damage to a photoreceptor and obtain copy paper without roughness on the copy surface.

In order to achieve this objective, the present invention provides a method in which a brush is brought into contact with the copy paper just before it meets the photoreceptor so as to clean the surface of the copy paper 1. I'm here.

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 2 shows the main body of the carrier removing device according to the present invention. This device main body 21 has a conductive holder 22
A conductive brush 23 is installed at the bottom of the holder 22.
A permanent magnet 24 is embedded in the abdomen of the person. The carrier removing device uses such a main body 21, and as shown in FIG. is in contact with the copy paper 7 immediately before the copy paper 7 and the photoreceptor 6 meet L! 7: It is a thing.

In an electronic copying machine equipped with a removing device, most of the remaining developer after development is deposited at the bottom of the developing machine/7-seat 2. A part of the developer falls from the gap [3] between the developer case 2 and the photoreceptor 6.The developer that fell from the gap B is
Most of it is collected by the catch pan 11, but some of it goes around the pan 11 and onto the copy paper 7. The carrier 3 in the developer dropped onto the copy paper 7 in this way.
As shown in FIG.
When cleaning, the brush cleans the area.

Furthermore, in the carrier removal device of this embodiment, the permanent magnet 'E
Since the brush 23 is magnetized by the i24, the magnetic force causes it to carry. 3b can be captured thereby ensuring removal of the carrier on the copy paper 7. Additionally, the copy paper 7 is normally charged during the conveyance process due to the friction of the conveyance rollers, etc., but in the apparatus of this embodiment,
Since the device frame 25, the boulder 22, and the brush 23 are made of a conductive material, and the brush 23 is electrically connected to the casing ground 26 via the holder 22 and the device frame 25, the electric charge on the copy paper 7- is is brush 23
Static electricity is removed by

In this way, the carrier I73 b J5 and the copying M7 from which the charge has been removed remain with the photoreceptor 6, and the transfer corotron 8 transfers the tonneau image on the photoreceptor 60.
It is discharged onto a tray (not shown) or the like.

In the embodiment, a permanent magnet 24 is embedded in the holder 22 so that the holder 22 can be easily attached to the device frame 25. 22 may be attached to the device frame 25, and the holder 22 may be attached to the tip of the catch pan 11.

1- As described, the carry V removal device according to the present invention has the following features:
On the copy paper being conveyed to the transfer process, in front of the process,
Since it is directly cleaned with a brush, it is possible to completely remove the carrier of the copy paper 1-, thereby reliably preventing damage to the surface of the photoreceptor caused by the scraping A/I, and also preventing roughness on the copied paper and F. There is no need to avoid causing problems.

[Brief explanation of the drawing]

Fig. 1 is a conceptual longitudinal cross-sectional view showing the main parts of a general component developer type electronic copying machine, and Fig. 2 is a conceptual longitudinal sectional view showing the main parts of a general component developer type electronic copying machine, and Fig. 2 is a conceptual longitudinal sectional view showing the main parts of a general component developer type electronic copying machine.
3) is a perspective view showing the main body of the dehumanizing head, and FIG. 3 is a conceptual enlarged view showing a carrier removal device using the main body of A. DESCRIPTION OF SYMBOLS 1... Development example, 2... Developing machine case, 3... Developer, 3a... 1~-, 3b... Carrier, 4...
... Magnet roll, 5... Developing sleeve, 6...
・Photoreceptor, 7... Copy paper, 8... Transfer corotron, 9... Paddle, 10... Toner supply roll, 1
DESCRIPTION OF SYMBOLS 1... Catch pan, 21... Main body, 22... Holder, 23... Brush, 24... Permanent magnet, 25...
...Device frame, 26...Case ground.

Claims (1)

[Claims] In a two-component developer-based electronic copying machine, a brush is disposed in a copy paper movement area just before the copy paper and the photoreceptor meet, and the brush is used to remove one print on the copy paper. A carrier removal device for a two-component developer type electronic copying machine, which is characterized by: