JPH09160345A - Corona electrification device for image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely support an electrode plate with a very simple supporting constitution and to obtain an excellent duplicate image by providing the electrode supporting member for positioning an end part of the plate shape electrode, on one side of which a tooth-shaped electric discharging part is formed, and the other side of which is formed in a L-shape. SOLUTION: The plate shape electrode 13, on which a number of tooth-shaped electric discharging parts 12 are formed with the same space, is set so as to face a surface of a photoreceptor with a specified space. Supporting openings 119 and 120 by which reference plane 114 and 115 is respectively formed for positioning the plate shape electrode 13 in order to support by inserting a bent part 13A whose one end edge is bent at right angle, of the plate shape electrode 13 whose sectional plane is formed in a shape of L-type inside the electrode supporting member 111 and 112 composed of an insulating material on both end of a back plate having a U-type sectional plane. The tooth-shaped electric discharging parts 12 of the plate shape electrode 13 are arranged on the specified position, by inserting either end of the plate shape electrode 13 together with the bent part 13A in the supporting openings 119 and 120, and holding the bent part 13A surface in contact with the reference surfaces 114 and 115.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corona charging device using a non-contact type serrated electrode which is mainly used for charging a photosensitive member in an electrophotographic image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, discharge electrodes for electrophotographic corona discharge are roughly classified into a wire discharge system (corotron, scorotron, dicorotron, etc.) and a pin discharge system (pin electrode type, serrated electrode type, etc.). It The latter has come to be used in electrophotographic copying machines, printers, etc. in recent years due to its low ozone generation amount. In particular, a charger having a structure using an electrode plate in which a plurality of sawtooth-shaped electrode portions are provided on one thin plate member is disclosed in JP-A-63-15272 and JP-A-5-157272.
It is disclosed in Japanese Patent Publication No. 45999. A structure in which the serrated electrode portion is held by a part of the corona charging device main body and is detachable is disclosed in Japanese Patent Laid-Open No. 5-289471, and both side surfaces of the serrated electrode portion are entirely held. The structure is disclosed in JP-A-6-83167. Further, Japanese Patent Laid-Open No. 7-84440 discloses a structure in which a sawtooth electrode portion is supported by a supporting member.

[0003]

However, although such a serrated electrode plate is excellent in discharge performance, it is rigid because a thin plate-shaped metal plate such as stainless steel having a thickness of about 0.1 mm is used. In order to hold the sawtooth electrode plate in the correct position, it is necessary to use a high-precision machined member and attach it to a resin member made to hold the accurate position. However, there is a problem in that all of the electrode plates cannot be manufactured to a desired accuracy because the electrode plates cannot be attached to the correct positions depending on the attaching work because of the necessity of costly processing.

Further, the structure described in Japanese Patent Laid-Open No. 6-83167, which holds the entire both side surfaces of the sawtooth electrode portion, increases the number of parts of the electrode device and makes the structure complicated.
Further, as disclosed in Japanese Unexamined Patent Publication No. 5-289471, there is disclosed a structure in which, when replacing an electrode plate having a reduced discharge effect, the electrode plate is detached from a corona charging device together with a supporting member provided fixedly. When replacing, the supporting member as well as the electrode plate had to be discarded, and there was much waste. Further, in Japanese Patent Laid-Open No. 7-84440, the plate electrode is simply held by the supporting member, and the holding force is weak and the plate electrode becomes unstable during the discharging action, and good charging cannot be performed.

As a result of solving and improving this point, the present invention provides
The purpose is to accurately support the electrode plate with a very simple holding structure and to provide a good copy image.

[0006]

In order to achieve the above object, the present invention provides a corona charging device according to claim 1, wherein a saw-tooth discharge portion of a plate-shaped electrode is opposed to an object to be discharged to discharge the object. In the device, a sawtooth discharge part is formed on one side and
An electrode supporting member having a V-shaped plate electrode and a positioning portion for setting an end portion of the plate electrode as a reference position is provided, wherein a sawtooth discharge portion is formed on one side, 4. The plate-shaped electrode, the other of which is formed in an L-shape, is provided in the positioning portion of the electrode support member to determine the distance between the saw-tooth discharge portion and the body to be discharged. The provided electrode supporting member is provided on the back plate. In the corona charging device according to claim 4, wherein the saw-tooth discharge portion of the plate-shaped electrode is opposed to the discharged body to discharge the discharged body. In this case, a plate electrode having a sawtooth discharge portion formed on one side and a plate electrode supporting member formed in an L shape are integrally fixed using a fixing member, and an end of the plate electrode supporting member is fixed at a reference position. Provided on the electrode support member that has the positioning part set as According to claim 5, the plate-shaped electrode having the saw-toothed discharge portion is provided on the plate-shaped electrode supporting member with a fixing agent and a double-sided tape, and in claim 6, the plate-shaped electrode is provided. The plate-shaped electrode support member is detachably provided from the positioning part of the electrode support member, and in the positioning part of the electrode support member according to claim 7, a part of the plate-shaped electrode support member is set as a reference position. By providing, the distance between the sawtooth discharge portion and the discharged body is determined. In claim 8, the electrode support member provided with the positioning portion is provided on the back plate. At
In a corona charging device for discharging a discharge-to-be-discharged object by facing a discharge-to-be-discharged object with a saw-tooth discharge part of a plate-like electrode, a plate electrode having a saw-tooth-like discharge part formed on one side thereof is fixed by pressing action L.
A plate-shaped electrode supporting member formed in a V shape, and an electrode supporting member having a positioning portion for setting an end of the plate-shaped electrode supporting member as a reference position of the plate-shaped electrode are provided in the corona charging device. 12. In 10, wherein a part of the plate-shaped electrode supporting member is provided on a positioning member of the electrode supporting member which is set as a reference position, so that the distance between the sawtooth discharge portion and the discharged body is determined. The electrode support member on which the positioning portion is formed is provided on a back plate, and the fixing projection is formed on a part of the plate-shaped electrode support member made of a resin material according to claim 12. 14. A hole formed in a plate-shaped electrode is inserted into the fixing protrusion, and the fixing protrusion is fixed to the plate-shaped electrode supporting member by caulking, the resin material according to claim 13. Part of the plate-shaped electrode support member 15. The plate-shaped electrode according to claim 14, wherein the plate-shaped electrode is fixed to the plate-shaped electrode support member by forming a fixed projection and press-fitting a hole formed in the plate-shaped electrode into the fixing projection. A fixing protrusion is formed on a part of the support member, and a hole having a retaining lock formed on the plate electrode is inserted into the fixing protrusion to fix the plate electrode to the plate electrode support member. The fixing projection having the elastic retaining locking portion of the plate electrode is formed on a part of the plate electrode support member made of a resin material, and the fixing electrode is formed on the plate electrode. This is achieved by inserting a hole into the fixing protrusion and fixing the plate electrode to the plate electrode supporting member by the fixing protrusion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Prior to the description of the embodiments of the present invention, the structure and operation of a copying machine in which the corona charging device of the present invention is used will be described.

In FIG. 1, reference numeral 10 denotes a photosensitive drum, which is an image bearing member, which is formed by coating a photosensitive member 101 (organic photosensitive member) on a drum base, which is grounded and driven to rotate clockwise in the drawing. To be done. Reference numeral 11 denotes a corona charger used in a corona charger, and the corona charger 11 is a sawtooth discharge unit 12
The plate-shaped electrode 13 is formed on the surface of the photoconductor 101, and the sawtooth-shaped discharge portion 12 provided in the shield plate 14 charges the surface of the photoconductor 101. Prior to the charging,
In order to eliminate the history of the photoconductor 101 up to the previous printing, the photoconductor 101 is precharged by exposure by a PCL (pre-charging static eliminator) 15 using a light emitting diode or the like.

After the photoconductor 101 of the photoconductor drum 10 is uniformly charged, the image exposure means 16 performs image exposure based on an original image or an image signal, and the photoconductor 101 of the photoconductor drum 10 is charged with toner. Developing devices 17 each containing a developer including a carrier are provided, and a developing sleeve 18 that contains a magnet, holds the developer, and rotates is used for development. The developer consists of a carrier in which ferrite is used as a core and an insulating resin is coated around the core, and a toner in which a pigment and a charge control agent, silica, and titanium oxide are mainly added to polyester,
The developer is deposited on the developing sleeve 18 by the layer forming means.
The layer is regulated to a layer thickness (developer) of 0 to 600 μm and conveyed to the developing area.

The gap between the developing sleeve 18 and the photosensitive member 101 in the developing area is 0.2 to more than the layer thickness (developer).
The bias voltage is applied during this time. In this way, the image forming process is performed with the developer,
A visible image of toner is formed on the peripheral surface of the photoconductor 101.

On the other hand, although not shown, one transfer material (hereinafter referred to as recording paper) P conveyed by the conveying member 21 from the paper feeding cassette through the paper feeding roller is temporarily stopped by the stop member 19.
When the transfer timing is adjusted, the stop member 19 is operated by the operating means 20 to release the recording paper P, and the registration roller 2
The sheet is fed to the transfer area by the rotation operation of 11.

In the transfer area, in synchronization with the transfer timing, the recording paper P fed by the transfer pole 22 serving as the transfer means is sandwiched around the peripheral surface of the photosensitive body 101 of the photosensitive drum 10 to form a toner image. Is transcribed.

Next, the recording paper P is destaticized by the separation pole 23, separated from the peripheral surface of the photosensitive drum 10, and then conveyed to the fixing device 24 where it is heated (upper roller) 25 and pressure roller (lower roller) 26. After the toner is fused by heating and pressurizing, the toner is discharged to the outside of the apparatus. On the other hand, the photosensitive drum 10 from which the recording paper P has been separated removes and cleans the residual toner by pressing the blade 28 of the cleaning device 27.
The PCL (pre-charging static eliminator) 15 again removes electricity, and the corona charger 11 receives the charge to start the next image forming process.

FIG. 2 is a sectional view taken along line BB in FIG. 3A showing a concrete first embodiment of the corona charger 11 of the present invention. FIG. 3 is a sectional view taken along line AA of FIG.

In FIG. 2, the plate-like electrode 13 having an L-shaped cross section in which the saw-tooth discharge portion 12 for charging the photosensitive member 101 is formed is made of a stainless material having a thickness of about 0.1 mm. , A large number of sawtooth discharge parts 12 are formed at equal intervals on the side edge of the photosensitive drum 10, which is the discharged body, facing the image area of the photosensitive drum 101, and are formed at a predetermined distance from the surface of the photosensitive body 101. They are installed so as to face each other with a gap of.

As shown in the figure, electrode supporting members 111 and 112 made of an insulating material are fixedly provided at both ends of a back plate having a U-shaped cross section, and the L-shaped cross section is provided in the electrode supporting members 111 and 112. The reference surfaces 114 and 115 for positioning the plate electrode 13 in order to insert and support the bent portion 13A formed by bending one end edge of the plate electrode 13 formed at 10
Support holes 119 and 120 are formed.
Both ends of the plate electrode 13 are inserted into the support holes 119 and 120 together with the bent portion 13A, and the surface of the bent portion 13A is the reference surface 11A.
The saw-tooth discharge part 12 of the plate electrode 13 is arranged at a predetermined position by contacting with 4,115. Further, a conductor 118 connects between one end of the plate electrode 13 and a terminal 117 connected to an external power source provided on the electrode supporting member 112.

As described above, the plate-shaped electrode 1 is formed in the bent portion 13A of the plate-shaped electrode 13 because it is formed in the L-shaped section.
The rigidity of 3 is maintained, and it does not vibrate due to impact or the like.

FIG. 4 is a sectional view taken along line BB in FIG. 5A showing a concrete second embodiment of the corona charger 11 of the present invention. 5A and 5B are cross-sectional views taken along the line AA of FIG.

The corona charger 11 of this embodiment also has substantially the same structure as that of the first embodiment, but in FIGS. 4 and 5 (a), this embodiment shows that the base of the plate-like electrode 13 is , Cross section L
The plate-shaped electrode support member 132 formed in a V shape is fixed with a plurality of fixing screws 131 via the double-sided adhesive tape T. FIG.
(B) is an embodiment in which the base portion of the plate-shaped electrode 13 is brought into contact with the plate-shaped electrode support member 132 having an L-shaped cross section, aligned with only the double-sided adhesive tape T, and then fixed. On the other hand, in order to position the plate-shaped electrode supporting member 132 formed on the electrode supporting members 111 and 112 made of an insulator fixed to both ends of the back plate having a U-shaped cross section, the supporting hole 1
36, 137 are formed on the reference surfaces 133, 134,
The plate-shaped electrode supporting member 132 is inserted into the reference surfaces 133 and 134 for positioning together with the supporting portion 135 formed in the right angle direction of the plate-shaped electrode supporting member 132 having the L-shaped cross section, and is supported at a predetermined position. Further, similarly to the above, a conductor 118 is connected between one end of the plate electrode 13 and a terminal 117 connected to an external power source provided on the electrode supporting member 112.

As described above, the plate-shaped electrode 13 is fixed to the plate-shaped electrode supporting member 132 that has rigidity by forming the plate-shaped electrode supporting member 13 in the L-shaped cross section.
2 is a reference surface 13 formed on the electrode supporting members 111 and 112.
Since it is supported by 3,134, the saw-tooth discharge portion 12 of the plate electrode 13 is held at a predetermined distance from the surface of the photoconductor 101, and further, the plate electrode 13 does not vibrate even if it receives an external impact or the like. It can be prevented.

FIG. 6 shows a third embodiment of the corona charger 11 of the present invention.
7B is a cross-sectional view taken along the line BB of FIG. FIG.
(A), (b), (c) shows the assembly order which attaches and fixes a plate-shaped electrode to a plate-shaped electrode support member. FIG.
(D) is sectional drawing of the AA line of FIG.

Since this embodiment is substantially the same as the second embodiment and only the means for attaching the plate electrode to the plate electrode supporting member is changed, only the changed portion will be described.

First, FIG. 7A shows a plate-shaped electrode support member 132 made of a thermoplastic resin. A fixing projection 13 for fixing the plate electrode 13 to the plate electrode supporting member 132.
8 is integrally provided, and the plate-shaped electrode 13 also has a fixing hole 139.
To form Next, as shown in FIG. 7B, the plate-shaped electrode 1 is attached to the fixing projection 138 of the plate-shaped electrode support member 132.
The fixing holes 139 of No. 3 are fitted and attached. Next, FIG.
As shown in (c), the tips of the fixing projections 138 are melted by a thermal caulking method, and a fixing portion 140 is formed as shown in the figure by using a mold or the like, and the plate-shaped electrode 13 is fixed to the plate-shaped electrode supporting member 13
2. Fix in the correct position.

FIG. 7D shows a state in which the plate electrode 13 is fixed to the plate electrode supporting member 132 and mounted on the electrode supporting members 111 and 112.

As described above, in FIG. 6 which is a sectional view taken along the line BB in FIG. 7D, the plate-shaped electrode supporting member 132 which has rigidity is formed by forming the L-shaped section. The side surface to which the electrode strip 13 is fixed is shown. As shown in the figure, the plate electrode 13 is fixed by melting the tip of the fixing projection 138 at a plurality of positions in the longitudinal direction by a heat welding method, and is fixed extremely firmly. The fixing hole 139 of the plate electrode 13 is formed as a horizontally long hole as shown in the figure, and the positional accuracy of the plate electrode 13 is improved by absorbing the difference in the coefficient of thermal expansion due to the different materials.

FIG. 8 shows a fourth embodiment of the corona charger 11 of the present invention.
9B is a cross-sectional view taken along the line 9B-B of FIG. FIG.
(A), (b) shows the assembly order which attaches and fixes a plate-shaped electrode to a plate-shaped electrode support member. FIG. 9C is a cross-sectional view taken along the line AA of FIG.

Since this embodiment is substantially the same as the second and third embodiments and only the means for attaching the plate electrode to the plate electrode supporting member is changed, only the changed portion will be described. . First, in FIG. 9A, a fixing hole 150 is formed in the plate-like electrode 13, and bending fixing pieces 151 and 152 protruding inward from the peripheral edge of the fixing hole 150 are integrally formed. Next, in FIG. 9B, a fixing projection 153 for fixing the plate electrode 13 is integrally provided on the plate electrode supporting member 132,
The fixing hole 150 of the plate electrode 13 is formed into the fixing protrusion 15
3 and by strongly press-fitting, the bending fixing pieces 151, 152 hit the fixing protrusion 153,
It is inserted in the bent state. FIG. 9C shows a state in which the fixing hole 150 of the plate electrode 13 has been pressed and fitted to the fixing protrusion 153. The bending fixing pieces 151, 1
A state in which the tip end of 52 strongly abuts on the fixing projection 153 due to the bending action, and the plate electrode 13 is formed in an L-shaped cross section and is fixed at an accurate position of the plate electrode supporting member 132 that maintains rigidity. Becomes

As described above, in FIG. 8 which is a sectional view taken along the line BB of FIG. 9C, the plate electrode 13 is fixed to the plate electrode supporting member 132 to show the side surface. Plate electrode 1 as shown
3 is a fixing protrusion 153 at a plurality of positions in the longitudinal direction.
The plate-shaped electrode 13 is fixed to the plate-shaped electrode 13 through the fixing hole 150, and the plate-shaped electrode 13 is firmly fixed.

FIG. 10 is a sectional view taken along line BB of FIG. 11 showing a fifth embodiment of the corona charger 11 of the present invention. 11 (a) and 11 (b) show an assembly sequence in which the plate electrode is attached and fixed to the plate electrode supporting member. FIG. 11 (c)
FIG. 11 is a sectional view taken along the line AA of FIG. 10.

Since this embodiment is substantially the same as the second, third and fourth embodiments and only the means for attaching the plate electrode to the plate electrode supporting member is changed, only the changed portion Will be explained. First, FIG. 11A shows a fixing projection in which a plate-shaped electrode support member 132 made of a resin material or the like has a hollow interior and a hook-shaped locking portion 161 having an inclined surface at its tip is formed. 160 is provided and a fixing hole 162 is formed in the plate electrode 13. Next, as shown in FIG. 11B, the plate-shaped electrode 13 has the fixing holes 162 aligned with the fixing protrusions 160, and the fixing holes 162 are fixed.
A hook-shaped locking portion 16 having a hollow inside by strongly press-fitting in the direction of the arrow along the inclined surface of 0.
1 deforms inward. By further pressing,
As shown in (c), the hook-shaped locking portion 1 of the fixing projection 160.
61 returns to the outside, and the plate-shaped electrode 13 is locked and fixed at a correct position. If notches are formed at a plurality of positions of the hook-shaped engaging portion 161, the hook-shaped engaging portion 161 is easily deformed and the press fitting can be facilitated.

FIG. 10 shows a side surface in a state where the plate electrode 13 is fixed to the plate electrode supporting member 132 which has rigidity by being formed into an L-shaped cross section. As shown in the figure, the plate-shaped electrode 13 is fixed to the fixing projection 160 at a plurality of positions in the longitudinal direction through the fixing holes 162 of the plate-shaped electrode 13, so that the whole plate-shaped electrode 13 is firmly fixed. Therefore, the plate-shaped electrode 13 is prevented from being deformed.

FIG. 12 is a sectional view taken along line BB of FIG. 13 showing the sixth embodiment of the corona charger 11 of the present invention. 13 (a) and 13 (b) show an assembly sequence in which the plate electrode is attached and fixed to the plate electrode supporting member. FIG. 13 (c)
FIG. 13 is a sectional view taken along the line AA of FIG. 12.

In this embodiment, the second, third, fourth and fifth are mentioned.
The embodiment is substantially the same as that of the above embodiment and only the means for attaching the plate-shaped electrode to the plate-shaped electrode support member is changed. Therefore, only the changed portion will be described. First, as shown in FIG. 13A, a plate-shaped electrode support member 132 made of a resin material or the like is provided with a fixing projection 170 having an umbrella-shaped locking portion 171 that opens like an umbrella at its tip. A fixing hole 172 is formed in the electrode 13. Next, as shown in FIG. 13B, the plate electrode 13
The fixing hole 172 of the fixing projection 170 and the fixing hole 172 is strongly pressed and fitted along the fixing projection 170 in the direction of the arrow so that the umbrella-shaped locking portion 171 is formed. Transforms inward. By further pressing, as shown in FIG. 13C, the umbrella-shaped locking portion 171 of the fixing projection 170 is opened, and the plate-shaped electrode 13 is locked and fixed to the plate-shaped electrode support member 132 at an accurate position. To be done.

FIG. 12 shows the side surface of the plate electrode 13 fixed to the plate electrode supporting member 132 which has rigidity by being formed into an L-shaped cross section. As shown in the figure, the plate electrode 13 is fixed to the fixing projection 170 at a plurality of positions in the longitudinal direction by the fixing holes 172 of the plate electrode 13, and the plate electrode 13 is firmly fixed as a whole. And deformation is prevented.

14 (a), (b) and (c) show a method of fixing the plate-shaped electrode support member 132 and the plate-shaped electrode 13 in addition to the second, third, fourth and fifth embodiments. Indicates.

As shown in FIG. 14A, the fixing projection 180 is provided on the plate-shaped electrode supporting member 132 made of a resin material or the like.
Are integrally formed, and the plate-shaped electrode 13 has a fixing hole 181.
To form The diameter φ2 of the fixing hole 181 is formed such that φ1> φ2 with respect to the diameter φ1 of the fixing protrusion 180. Next, as shown in FIG. 14B, the fixing hole 181 is press-fitted into the fixing protrusion 180 by forcibly and strongly fitting the fixing hole 181 in the plate electrode 13 to the fixing protrusion 180. To do. The plate electrode 13 is fixed to the plate electrode support member 132 by the above operation. FIG. 14 (c)
14B is a side view of FIG. 14B. In the plate-shaped electrode 13, the fixing hole 181 is formed as a horizontally long hole, and at the time of press fitting, a part of the fixing protrusion 180 is formed. It is easy to escape and press fit.

[0037]

As described above, according to the present invention, in claim 1, a plate electrode having a sawtooth discharge portion on one side and a bent portion on the other side, and a folding of the plate electrode Since the plate-shaped electrode itself has rigidity because it is provided on the electrode supporting member on which the positioning portion that sets the curved portion as the reference position is provided, the discharge action is not affected even if vibration during discharge occurs, and the corona charging device It is possible to reduce the number of parts and reduce the size.

According to a second aspect of the present invention, the bent portion of the plate-shaped electrode is bent at a right angle to the saw-tooth discharge portion, and the bent portion is provided at the positioning portion of the electrode supporting member, thereby forming the saw-tooth discharge portion. Since the distance between the discharged bodies is determined, a predetermined amount of charge can be applied to the photosensitive body due to the discharge.

In the third aspect, since the electrode supporting member provided with the positioning portion is provided on the back plate, the number of parts can be reduced and the size can be reduced.

According to a fourth aspect of the present invention, the hole provided in the plate electrode having the sawtooth discharge portion formed on one side and the plate electrode supporting member are fixed by a fixing member, and a part of the plate electrode supporting member is used as a reference. By providing an electrode support member having a positioning portion to be set as a position, thin plate electrodes can be linearly arranged, and since the plate electrode support member to which the plate electrode is fixed is positioned, the plate electrode is It is arranged at a predetermined position and can always give a predetermined charge amount to the photoconductor.

According to the present invention, the plate-shaped electrode having the sawtooth discharge portion is provided on the plate-shaped electrode supporting member with a screw and a double-sided tape, so that the plate-shaped electrode is extremely firmly attached to the plate-shaped electrode supporting member. Since it is fixed, no error occurs due to vibration or shock, and good charging can always be performed.

According to claim 6, the plate-shaped electrode supporting member provided with the plate-shaped electrode is detachably provided from the positioning portion of the electrode supporting member so that the plate-shaped electrode is assembled and the plate-shaped electrode is provided. Support members can be easily replaced.

According to a seventh aspect of the present invention, by providing a part of the plate-shaped electrode supporting member at a positioning portion of the electrode supporting member which is set as a reference position, the distance between the sawtooth discharge portion and the discharged body is determined and the photosensitive member is always exposed. It can give a certain amount of charge to the body.

In the eighth aspect, since the electrode supporting member provided with the positioning portion is provided on the back plate, the number of parts can be reduced and the size can be reduced.

Claims 9, 10, 11, 12, 13, 1
In FIGS. 4 and 15, holes are formed in the plate-shaped electrode having a saw-toothed discharge portion formed on one side and the fixing projections of the plate-shaped electrode supporting member are fixed, and a part of the plate-shaped electrode supporting member is fixed. By providing the electrode support member having the positioning portion set as the reference position in the corona charging device, it is not necessary to fix the plate electrode to the plate electrode support member using a separate fixing member, The fixing work is extremely easy, and it can be performed accurately and quickly, and at the same time, the number of parts is reduced, the size is reduced, and the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram of an image forming apparatus using a corona charging device of the present invention.

FIG. 2 is a cross-sectional view of the corona charging device of the present invention.

FIG. 3 is a vertical sectional view of a corona charging device of the present invention.

FIG. 4 is a cross-sectional view showing a method of fixing a plate electrode and a plate electrode supporting member in the corona charging device of the present invention.

FIG. 5 is a vertical cross-sectional view showing a method of fixing a plate electrode and a plate electrode supporting member in the corona charging device of the present invention.

FIG. 6 is a transverse cross-sectional view showing a method of fixing a plate electrode and a plate electrode supporting member in another corona charging device of the present invention.

FIG. 7 is a vertical cross-sectional view of another plate-shaped electrode and a plate-shaped electrode support member fixing method of the present invention and a corona charging device.

FIG. 8 is a cross-sectional view showing a method of fixing a plate electrode and a plate electrode supporting member in another corona charging device of the present invention.

FIG. 9 is a vertical cross-sectional view of another plate-shaped electrode and a plate-shaped electrode support member fixing method of the present invention and a corona charging device.

FIG. 10 is a transverse cross-sectional view showing a method of fixing a plate electrode and a plate electrode supporting member in another corona charging device of the present invention.

FIG. 11 is a vertical cross-sectional view of another plate-shaped electrode and a plate-shaped electrode supporting member fixing method of the present invention and a corona charging device.

FIG. 12 is a cross-sectional view showing a method of fixing a plate electrode and a plate electrode supporting member in another corona charging device of the present invention.

FIG. 13 is a vertical cross-sectional view of another plate-shaped electrode and a plate-shaped electrode supporting member fixing method of the present invention and a corona charging device.

FIG. 14 is an explanatory view showing another fixing method of the plate electrode and the plate electrode supporting member of the present invention.

[Explanation of symbols]

10 Photoreceptor Drum 101 Photoreceptor 11 Corona Charger 12 Sawtooth Discharge Section 13 Plate Electrode 14 Shield Plate 17 Developer 111, 112 Electrode Support Member 114, 115 Reference Surface 132 Plate Electrode Support Member 138, 153, 160, 170 , 180 Fixing protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Koshimura 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Stock Company

Claims (15)

[Claims] 1. A corona charging device for discharging a discharge-to-be-discharged object by causing a saw-tooth discharge part of a plate-like electrode to face the discharge-to-be-discharged object, wherein a saw-tooth-like discharge part is formed on one side of the corona charging device A corona charging device for an image forming apparatus, comprising: the plate-shaped electrode described above; and an electrode support member having a positioning portion that sets an end of the plate-shaped electrode as a reference position. 2. A plate-shaped electrode having a saw-tooth discharge portion formed on one side and an L-shape on the other side is provided at a positioning portion of an electrode supporting member to determine the distance between the saw-tooth discharge portion and the body to be discharged. The corona charging device for an image forming apparatus according to claim 1, wherein: 3. The corona charging device for an image forming apparatus according to claim 1, wherein the electrode supporting member provided with the positioning portion is provided on a back plate. 4. A corona charging device for discharging a discharge-to-be-discharged object by causing a saw-tooth discharge part of a plate-shaped electrode to face the discharge-target object, and a plate-shaped electrode having a saw-tooth discharge part formed on one side thereof, The plate-shaped electrode supporting member formed in an L shape is integrally fixed using a fixing member, and the plate-shaped electrode supporting member is provided on the electrode supporting member having a positioning portion for setting the end portion of the plate-shaped electrode supporting member as a reference position. Corona charging device for image forming device. 5. A corona charging device for an image forming apparatus according to claim 4, wherein the plate-shaped electrode having the saw-tooth discharge portion is provided on the plate-shaped electrode supporting member with a fixing agent and a double-sided tape. 6. A plate-shaped electrode supporting member provided with a plate-shaped electrode,
The corona charging device for an image forming apparatus according to claim 4, wherein the corona charging device is detachably provided from a positioning portion of the electrode supporting member. 7. The electrode supporting member for setting a part of the plate-shaped electrode supporting member as a reference position is provided in the positioning portion to determine the distance between the saw-tooth discharge portion and the discharged body. Item 7. A corona charging device for an image forming apparatus according to item 4, 5 or 6. 8. The corona charging device for an image forming apparatus according to claim 4, wherein the electrode support member provided with the positioning portion is provided on a back plate. 9. A corona charging device for discharging a discharge-to-be-discharged object by causing a saw-tooth-like discharge part of a plate-like electrode to face the discharge-receiving object, and pressing a plate-like electrode having a sawtooth-like discharge part formed on one side thereof. An L-shaped plate-shaped electrode supporting member fixed by action and an electrode supporting member having a positioning portion for setting an end of the plate-shaped electrode supporting member as a reference position of the plate-shaped electrode are provided in the corona charging device. A corona charging device for an image forming apparatus characterized in that 10. The gap between the saw-toothed discharge part and the body to be discharged is determined by providing a part of the plate-shaped electrode support member as a positioning member of the electrode support member which is set as a reference position. Item 10. A corona charging device for an image forming apparatus according to Item 9. 11. The corona charging device for an image forming apparatus according to claim 9, wherein the electrode supporting member having the positioning portion is provided on a back plate. 12. A plate-shaped electrode supporting member made of a resin material is provided with a fixing projection on a part thereof, and the hole formed in the plate-shaped electrode is inserted into the fixing projection for supporting the plate-shaped electrode. 10. The corona charging device for an image forming apparatus according to claim 9, wherein the plate-shaped electrode is fixed to the plate-shaped electrode support member by thermal caulking the fixing protrusion. 13. A plate-shaped electrode supporting member is formed by forming a fixing protrusion on a part of a plate-shaped electrode supporting member made of a resin material and press-fitting a hole formed in the plate-shaped electrode into the fixing protrusion. The corona charging device for an image forming apparatus according to claim 9, wherein the corona charging device is fixed to an electrode supporting member. 14. A plate-shaped electrode supporting member is formed by forming a fixing protrusion on a part of the plate-shaped electrode supporting member, and inserting a hole in the plate-shaped electrode having a retaining locking portion into the fixing protrusion. The corona charging device for an image forming apparatus according to claim 9, wherein the corona charging device is fixed to the electrode support member. 15. A plate-shaped electrode supporting member made of a resin material is provided with a fixing projection having an elastic retaining portion for the plate-shaped electrode formed in a part of the plate-shaped electrode supporting member, and the hole formed in the plate-shaped electrode is 10. The corona charging device for an image forming apparatus according to claim 9, wherein the corona charging device is inserted into a fixing protrusion and the plate electrode is fixed to the plate electrode supporting member by the fixing protrusion.