JP2003149915A - Electrifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the fixing method for an electrifying wire by which the working property of laying the electrifying wire in a tensioned state and installing the electrifying wire is facilitated and which is adaptive to an electrifying device having a different length in the fixing means of the electrifying wire in a corona electrifier. SOLUTION: The fixing member of the electrifying wire is provided with the fixing member to lay the electrifying wire in a tensioned state by a specified length by overlapping projected and recessed or wave-shaped members with each other so as to hold the electrifying wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corona type charger which is used in a copying machine or a printer and which charges a photoconductor or the like by corona discharge. In particular,
This relates to the method of stretching and fixing the charging wire in the charger.

[0002]

2. Description of the Related Art First, a schematic structure of an image forming unit in an image forming apparatus will be briefly described with reference to FIG.

In the image forming section shown in FIG. 5, the photoconductor 1 which is an image carrier is charged by the charger 2 and the image of the original is exposed at the exposure position 3 by the exposure optical system to expose the photoconductor 1.
Electrostatic latent image is formed on the peripheral surface of the photoconductor 1, and the electrostatic latent image formed on the peripheral surface of the photoconductor 1 is developed by the developing device 5 to form a developer (toner) image. After transfer to the transfer paper P by applying the voltage of the transfer charger 4 and cleaning of the photoconductor 1 after transfer by the cleaning device 6, pre-charging exposure 7 is performed to remove residual charges, and the above steps are repeated again. Image formation is performed.

Here, the general charger used in the image forming section will be described with reference to FIGS. 3 and 4.

FIG. 4 is a perspective view of the appearance of the charger.
1 includes a shield plate 12 whose one surface is open, and insulating blocks 14 and 15 at both ends thereof. A charging wire 13 is stretched between the insulating blocks 14 and 15, and a high voltage is applied from 16 electrode portions.

Explaining further by the sectional view shown in FIG. 3, one end of the charging wire 13 is fixed to a fixing member 18 provided on the insulating block 14, and the other end thereof is connected to an electrode member 19 via an elastic member such as a spring. It is stretched and fixed to.

3 (E) and 3 (F) show a method of fixing the charging wire 13. In (E), as shown in the enlarged view of the inside of the circle in the figure, the end of the charging wire is fixed by making a ring of a predetermined size and winding the remaining charging wire several times. .

Further, (F) is a charging wire obtained by cutting the charging wire into a predetermined length: L and treating both ends with members such as crimp terminals. Such a method of fixing the charging line is common.

[0009]

However, the above-mentioned method of fixing the charging line has the following problems.

First, in the method of winding and fixing the charging wire, since the charging wire is a tungsten wire of about several tens of microns, there is a problem that it is easily bent and cannot be corrected once it is wound. Workability is poor. Also,
In the method in which the charged wire is cut into a predetermined length in advance and the end portion is processed, the charged wire of the length suitable for each product must be prepared for maintenance such as disconnection of the charged wire or replacement due to deterioration. The economy was poor, such as having to do it.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a method for fixing a charging wire which has good workability and can be applied to various products.

[0012]

In order to solve the above-mentioned problems, the present invention is provided with a shield plate surrounding a charging wire and having one open, and insulating blocks at both ends of the shield plate. In the charger in which the charging wire is stretched, the uneven and wavy shape members are provided at both ends of the charging wire.
This is to provide a fixing member which is superposed on each other, holds the charging wire and stretches the charging wire with a predetermined length.

Further, the fixing member is made of a material such as a metal which is plastically deformed and deformed by applying an external pressure.

Further, the fixing member is fixed by using a fastening means such as a screw or a snap fit.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Embodiment) FIG. 1 is a sectional view of a charger in which the charging line fixing method of the present invention is implemented. Reference numeral 12 is a shield plate, 14 is an insulating block, 15 is an insulating block, and 19 is an electrode portion, which are the same as the reference numerals shown in FIG. The fixing method of the charging wire according to the present invention includes a fixing portion 2 provided at both ends of the charging wire 13.
1 and an electrode plate 20 made of an elastic member such as a leaf spring that is in conductive contact with the electrode portion 19.

As shown in FIG. 2, the fixing member 22 is formed by providing an uneven slit in the central portion of a cylindrical material such as lead.

One of the slits has a concave shape 22b,
The other is a convex shape 22a, and a gap is provided so as to overlap each other. The charging wire 13 is inserted into the slit of the fixing member 22, external pressure is applied at a position of a predetermined length of the charging wire 13, and the slits 22a and 22b are closed to fix the charging wire 13.

Here, a procedure for stretching the charging wire will be described. First, the fixing member 22 is attached to one end of the long charging wire.
To fix. Next, the fixing member 22 is attached to the electrode plate 20 of the charger.
And then pull it to the opposite insulating block 14,
The other end of the charging wire 13 is attached and fixed to the fixing member 22 at a predetermined position. At this time, the electrode plate 2 is attached to the charging wire 13.
The elastic force of 0 applies tension to the charging wire 13. After the above work is completed, the excess charging wire 13 is cut off to complete the work.

The fixing member will be further described with reference to FIG.
(A) is a cross-sectional view of the fixing member 22 described above and shows a shape in which the charging wire 13 is sandwiched.

The uneven shape shown in the figure has corners,
It is preferable to have no corners. Further, in FIG. 2B, the shape in which the charging wire 13 is sandwiched is a corrugated shape 22 (c).
It is what Further, in FIG. 2C, the fixing member is made into two parts and fastened with screws. Further, the structure shown in (D) has a structure in which the material of the fixing member is formed of a conductive resin or the like, a hinge is provided at one end, and a snap fit is provided at the other end to sandwich the charging wire. is there.

[0022]

As described above, by using the fixing member of the present invention which holds and fixes the charging wire, the charging wire can be prevented from being broken or broken by a simple mounting method. Therefore, the workability of attaching and replacing the charging wire can be improved. Further, it is economically effective because it is not necessary to prepare a charging line for each product at the time of maintenance and inspection, and a longer charging line can be used.

[Brief description of drawings]

FIG. 1 is a sectional view of a charger embodying the present invention.

FIG. 2 is a sectional view of the fixing member for the charging wire of the present invention, (A) the fixing member, (B) a sectional view of a different shape of the fixing member, and (C)
The figure which shows the fixing member which uses a fastening component, (D) The figure which shows the fixing member which uses snap fit.

FIG. 3 is a cross-sectional view of a conventional charger, (E) a diagram showing a conventional method for fixing a charging line, and (F) a diagram showing a method for fixing a conventional charging line.

FIG. 4 is a perspective view of a general charger.

FIG. 5 is a configuration diagram of an image forming unit in which a charger is used.

[Explanation of symbols]

1 photoconductor 2 charger 3 exposure position 4 Transfer charger 5 Development device 6 cleaning device 7 Exposure before charging 11 charger 12 Shield plate 13 charged wire 14,15 Insulation block 16 electrodes 17 Elastic member 18 Fixing bracket 19 electrode plate 20 Elastic electrode plate 21 Fixed part 22 Fixing member 22a, b, c slits of fixing member

Claims (3)

[Claims] 1. A charging device comprising a shield plate surrounding a charging wire and having one open, and insulating blocks at both ends of the shield plate, wherein the charging wire is stretched between the insulating blocks. In addition, the charging device is characterized in that an uneven or corrugated member is overlapped with each other to sandwich the charging wire and to provide a fixing member that stretches the charging wire by a predetermined length. 2. The charger according to claim 1, wherein the fixing member is made of a material such as a metal that is plastically deformed and deformed by applying an external pressure. 3. The charger according to claim 1, wherein the fixing member is fixed by using a fastening means such as a screw or a snap fit.