JP2003140437A - Corona electrifier and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the replacement life of the corona wire 15 of a corona charger 25 by improving cleaning ability to clean the corona wire 15. SOLUTION: When a pulley 23 attached to the motor shaft of a motor 14 is rotated, a driving wire 13 laid on the pulley 23 and a slider 10 fixed on the wire 13 are moved, and furthermore, cleaning members 17 and 18 rotatably supported by supporting members 19 and 20 on the upper surface of the slider 10 are moved together with the slider 10, and pinion gears 21 and 22 at one-side ends of the cleaning members 17 and 18 roll on a rack 16. Since the gears 21 and 22 mesh with the rack 16 and rotate, rotary shafts 17b and 18b and brushes 17a and 18a constituted integrally with the gears 21 and 22 are rotated, so that the corona wire 15 is cleaned by the entire surfaces of the brushes 17a and 17b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corona charger and an image forming apparatus using the electrophotographic system that includes a corona charger.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus using an electrophotographic system such as a copying machine, a corona charger has been used to perform corona discharge on a photosensitive drum as an image carrier. When a voltage is applied to the corona wire stretched around the corona charger, it becomes easy to absorb the toner and oil mist floating around the wire. If the wire becomes dirty, the discharge may be uneven, and as a result, the image may be uneven. Therefore, a wire cleaning device for cleaning the wire is attached to the corona charger, and the wire is cleaned when the main switch is turned on or after copying a predetermined number of sheets.

A first conventional example will be described with reference to FIG.

FIG. 9 is a partially cutaway perspective view of a corona charger equipped with a conventional wire cleaning device.

As shown in FIG. 9, the conventional wire cleaning device is configured to be driven by a motor 204 while pressing a pad (cleaning member) 202 such as a non-woven fabric attached to an elastic member 201 against a wire 203 with a predetermined contact force. By moving (reciprocating) the pad 202 fixed to the driving wire 205 in the stretching direction of the wire 203, the dirt of the wire 203 is wiped off by the pad 202.

As a second conventional example, as shown in FIG. 10, the screw shaft 206 moves the pad 202 in the tension direction of the wire 203.

[0007]

However, in the conventional method, as shown in FIG. 11, the pad 202 is liable to be concentrated in a concentrated manner only in a portion where the pad 202 is in contact with the wire 203. Pad 2 when accumulated
There was a drawback that the contact surface of No. 02 was covered with dirt and the cleaning ability was deteriorated.

The cleaning of the wire 203 is performed by the wire 203.
On the other hand, reciprocating operation is performed, but dirt may be scraped off and collected on the edge of the pad 202 in the traveling direction on the forward path and returned to the wire 203 on the return path, and as a result, the cleaning ability is not improved. There was a problem that there is.

Therefore, in the above-mentioned structure, the dirt on the wire 203 cannot be completely wiped off, and the dirt on the wire 203 gradually increases. Therefore, it is necessary to replace the dirty wire 203 regularly. there were.

Therefore, as an object of the present invention, the wire 2
It is to improve the cleaning ability of cleaning the wire 03 and extend the replacement life of the wire 203.

[0011]

A first configuration of a corona charger according to the present invention is a corona charger that applies a voltage to a stretched corona wire to cause discharge, in the stretching direction of the corona wire. A movable pedestal, a pedestal driving means for moving the pedestal, a support member fixed to the pedestal, and a support rotatably supported by the support member to abut the corona wire to clean dirt of the corona wire 1 Or a plurality of cleaning members, the cleaning member rotates while being in contact with the corona wire while being driven by the movement of the pedestal.

A second structure of the corona charger according to the present invention is the same as the first structure, wherein a cleaning portion provided at one end of the rotating shaft of the cleaning member comes into contact with the corona wire.

A third structure of the corona charger according to the present invention is the same as the second structure, wherein the cleaning members are arranged in a pair on both sides of the corona wire so as to sandwich the corona wire.

A fourth structure of the corona charger according to the present invention is the same as the third structure, wherein the cleaning portions facing the pair of cleaning members rotate in mutually opposite directions.

A fifth constitution of the corona charger according to the present invention is the corona charger according to any one of the second to fourth constitutions, wherein the corona charger is provided on a shield member of the corona charger in a stretching direction. One power transmission member and a second power transmission member that rotates by receiving power from the first power transmission member as the pedestal moves, and the cleaning member has the second power transmission member. The rotation of the power transmission member is transmitted and rotates.

A sixth structure of the corona charger according to the present invention is the above-mentioned fifth structure, wherein the first power transmission member and the second power transmission member are meshed with each other, whereby the first power transmission member is engaged with the first power transmission member. The power is transmitted from the power transmission member to the second power transmission member.

A seventh configuration of the corona charger according to the present invention is the fifth configuration, wherein the friction force between the first power transmission member and the second power transmission member causes the corona charger to have the above-mentioned fifth configuration. Power is transmitted from the first power transmission member to the second power transmission member.

An eighth construction of the corona charger according to the present invention is the construction of any one of the first to seventh constructions, further including a drive wire that moves endlessly in the direction in which the corona wire is stretched. Is locked to the drive wire, and the pedestal is moved by the movement of the drive wire.

A ninth structure of the corona charger according to the present invention is the same as the first structure, except that a screw shaft is provided in a stretching direction of the corona wire, the pedestal is engaged with the screw shaft, and the screw is installed. The pedestal is moved by rotationally driving the shaft.

A tenth structure of the corona charger according to the present invention is the ninth structure, wherein the cleaning member has a cylindrical cleaning portion having a rotating shaft coaxial with the axial direction of the screw shaft. .

An eleventh structure of the corona charger according to the present invention is the above-mentioned ninth structure, wherein the cleaning member is a cylindrical cleaning portion having a rotating shaft in a direction substantially orthogonal to the axial direction of the screw shaft. Have.

The twelfth structure of the corona charger according to the present invention is the tenth or eleventh structure, wherein a pair of the cylindrical cleaning portions are arranged on both sides of the corona wire so as to sandwich the corona wire. .

A thirteenth configuration of the corona charger according to the present invention is the configuration of any one of the ninth to twelfth aspects, wherein the first power transmission member to which the rotation of the screw shaft is transmitted, And a second power transmission member to which the rotation of the first power transmission member is transmitted, and the cleaning member rotates by the rotation of the second power transmission member being transmitted.

A fourteenth structure of the corona charger according to the present invention is the thirteenth structure, wherein the rotation is transmitted from the screw shaft to the cleaning member by friction or gears.

A fifteenth constitution of the corona charger according to the present invention is the constitution of any one of the first to fourteenth constitutions, wherein the cleaning portion of the cleaning member is made of non-woven fabric.

A sixteenth constitution of the corona charger according to the present invention is the constitution of any one of the first to fourteenth constitutions, wherein the cleaning portion of the cleaning member is a brush.

In the image forming apparatus according to the present invention, the corona charger having any one of the first to sixteenth constructions is arranged to face the latent image carrier.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Note that the examples in this embodiment do not limit the present invention.

(First Embodiment) The first embodiment according to the present invention will be described below with reference to FIG.

FIG. 1 is a partially cutaway perspective view of a corona charger 25 equipped with a wire cleaning device 24 according to the first embodiment.

In FIG. 1, the corona charger 25 has three side surfaces, that is, both side surfaces and an upper surface, which are shielded by shield members, in which corona wires 15 are stretched, and an open surface faces a photosensitive drum (not shown). The image forming apparatus can be attached thereto, and in the figure, reference numeral 50 is a shield member that forms a shield member on the upper surface. In this shield member 50, a long hole is formed in the central portion so as to face the corona wire 15, and the edge portion in the longitudinal direction of this long hole serves as a rail portion, and the slide piece 10 as a pedestal has rail portions on both sides thereof. Is movably attached to.

The slide member 10 includes a shield member 50.
Drive wire 13 which will be described later and is stretched outside
The extending portion 10a extending toward the side is formed, and the driving wire 13 penetrates the slit 11 formed at the tip of the extending portion 10a. The pair of round balls 12 fixed to the driving wire 13 sandwiches and locks the slit 11 so that the slide piece 10 is driven by the driving wire 1.
3 fixed in place. The drive wire 13 is wound between pulleys provided at both ends of the corona charger 25 in the lengthwise direction, and is wound a plurality of times around one drive pulley 23. Then, the drive pulley 2 is driven by the motor 14.
When the driving wire 13 is driven in the direction of the arrow a in the figure, the slide piece 10 slides in parallel with the direction in which the corona wire 15 is stretched.

A rack 16 as a first power transmission member is fixed to both edges of the elongated hole of the shield member 50 in parallel with the moving direction of the slide piece 10.

On the other hand, inside the slide piece 10, cleaning means 17, 18 as a cleaning member having the same structure on the left and right sides are arranged with the corona wire 15 interposed therebetween. This cleaning means 17
And 18 are circular brushes 17 that sandwich the corona wire 15.
a and 18a, and rotating shafts 17b and 18b are fixed to the brushes 17a and 18a, respectively.
7b and 18b are rotatably supported by support members 19 and 20 provided on the slide piece 10. Also,
Pinion gears 21 and 22 as second power transmission members are fixed to the other ends of the rotary shafts 17b and 18b, respectively, and these pinion gears 21 and 22 are configured to mesh with the respective racks 16. .

Next, the operation of each of the above members will be described.

When the pulley 23 attached to the motor shaft of the motor 14 rotates, the drive wire 13 hung on the pulley 23 moves, and the slide piece 10 fixed to the drive wire 13 moves. The cleaning means 17 and 18 provided on the slide piece 10 are also slide pieces 1
0 and the cleaning means 1 at that time.
The pinion gears 21 and 22 of 7 and 18 mesh with the teeth of the rack 16 and rotate. Then, the rotary shafts 17b and 18 that are integrally formed with the pinion gears 21 and 22.
b and the brushes 17a and 18a also rotate.

According to this structure, the cleaning means 17,
By rotating the brushes 17a, 18a of 18, the corona wire 15 can be cleaned using the entire surface of the brushes 17a, 18a, and the slide piece 10 moves in the tension direction of the corona wire 15 so that the corona wire 15 can be cleaned. 15 can be cleaned over its entire length.

On the other hand, the slide piece 10 has one end of the corona charger 15 as the home position, and when it is moved to the other end during cleaning, it is detected by a sensor (micro switch) on the other end (not shown). The reverse rotation of 14 returns it to the home position. An unillustrated one end side sensor is arranged at the home position, and when the slide piece 10 reaches the home position, it is detected by the one end side sensor and stopped after the detection.

As described above, according to the first embodiment, the brush 1 is cleaned by cleaning the corona wire 15 using the entire surfaces of the two rotating brushes 17a, 18a.
7a and 18a are prevented from locally attaching dirt, and the frictional force between the brushes 17a and 18a and the corona wire 15 is increased, so that the ability of the brushes 17a and 18a to collect dirt on the corona wire 15 is increased, It is possible to efficiently remove the dirt on the corona wire 15.

Further, according to the first embodiment, since the present configuration can be realized by using the power of the motor 14 for driving the slide piece which is the existing drive source, the drive can be reduced. It is possible to obtain the above-mentioned effects with a simple configuration without the need to add.

Further, according to the first embodiment, since the corona wire 15 can be efficiently cleaned,
The replacement life of the corona wire 15 can be extended.

Although the rack 16 and the pinion gears 21 and 22 are used as means for driving the cleaning means 17 and 18 in the first embodiment, the present configuration is not limited to this. . For example, a friction surface such as a friction pad may be arranged on the rack 16 and a circular friction member may be arranged on the pinion gears 21 and 22 to generate a driving force by friction.

Further, in the first embodiment, the drive wire 13 is used as the drive means for the slide piece 10, but the drive wire 13 is not limited to this, and the slide piece may be provided by a drive means such as a screw shaft. It is also possible to move 10.

In the first embodiment, 2
Although one cleaning means 17, 18 is used, the number may be one or three or more.

Further, in the first embodiment,
Although the brushes 17a and 18a are used as the cleaning means 17 and 18, this configuration is not limited to this, and a non-woven cloth-like cleaning member may be used.

(Second Embodiment) A second embodiment according to the present invention will be described below with reference to FIG. In addition, the same reference numerals are given to members common to the above-mentioned drawings,
The parts that are not particularly described have the same configuration as that of the first embodiment described above.

FIG. 2 is a partially cutaway perspective view of a corona charger 25 equipped with a wire cleaning device 24 according to the second embodiment.

In the second embodiment, as a characteristic difference from the above-described first embodiment, as shown in FIG. 2, there is a gap between the cleaning means 17 on one side and the pinion gear 21. By engaging the two gears 51 and 52 with each other, it is possible to rotate the brushes 17a and 18a of the cleaning means 17 and 18 in opposite directions.

When the driving wire 13 moves to the inner side in the stretching direction (rightward in the drawing), the slide piece 10 and the cleaning means 1
7, 18 and the pinion gears 21 and 22 move in the same right direction, but as the pinion gear 21 rotates in the clockwise direction in the figure, the gear 51 rotates in the clockwise direction in the figure and the gear 52 shows in the figure. Rotate counterclockwise. And
The cleaning means 17 rotates together with the gear 52 in the counterclockwise direction in the figure. On the other hand, the cleaning means 18 rotates in the same direction as the pinion gear 22 rotating clockwise in the drawing, that is, in the opposite direction to the cleaning means 17.

According to the configuration of the above-described second embodiment, the same effect as that of the above-described first embodiment can be obtained, and the two cleaning means 17 and 18 with respect to the corona wire 15 are provided. Since the rotational force is applied from both sides in the opposite direction, the corona wire 15 can be prevented from dropping from the cleaning portion.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to FIGS. 3 to 7. The members common to the respective drawings are given the same reference numerals.

FIG. 3 is a perspective view of the corona charger 125 to which the wire cleaning device 124 according to the third embodiment is attached, and FIG. 4 is a partially cutaway bottom view of FIG. 3 seen from below. .

In FIG. 3, as with the corona charger of the first embodiment, the corona charger 125 has both side surfaces and three upper surfaces shielded by shield members, and the corona wire 140 is stretched therein. The image forming apparatus is attached so that the open surface faces a photosensitive drum (not shown). In the figure, reference numeral 150 denotes a shield member that forms a shield member on the upper surface. In this shield member 150, a long hole is formed in the central portion so as to face the corona wire 140, and an edge portion in the longitudinal direction of the long hole is used as a rail portion, and the slide pieces 110 as pedestals have rail portions on both sides thereof. Is movably attached to. The slide piece 110 is slidably mounted parallel to the direction in which the corona wire 115 is stretched, and a metal screw shaft 130 is inserted through a through hole formed through the slide piece 110 in the slide direction. At this time, the projection 112 provided in the through hole of the slide piece 110 is configured to mesh with the recess of the screw shaft 130. Then, when the screw shaft 130 is driven by a drive source (a motor gear-connected to the screw end portion) not shown, the slide piece 110 is driven in the axial direction of the screw shaft 130.

On the slide piece 110, cylindrical cleaning pads 113 and 114 as two cleaning members made of a non-woven fabric and a core material that supports the non-woven fabric are provided as support members 116 and 1.
It is rotatably supported by 17. A corona wire 140 is stretched at a position penetrating the center of a nip portion formed by the two cylindrical cleaning pads 113 and 114. Cylindrical drive transmission members 118 and 119 as second power transmission members are integrally formed at the ends of the cylindrical cleaning pads 113 and 114, respectively.
Will rotate with. These cylindrical drive transmission members 118 and 119 are in frictional contact with an idler member 120 as a first power transmission member, and the idler member 120 is in frictional contact with the outer diameter portion of the screw shaft 130.

Next, the operation of each member described above will be described.

The screw shaft 13 is driven by a motor (not shown).
When 0 rotates, the slide piece 110 moves, the idler member 120 receives frictional force from the screw shaft 130, and further the frictional force from the idler member 120 causes the two cylindrical drive transmission members 118 and 119 to move. It will rotate integrally with the cylindrical cleaning pads 113, 114.

According to this structure, the cylindrical cleaning pads 113 and 114 are rotated to use the entire surface of the cylindrical cleaning pads 113 and 114, and thus the corona wire 140 is used.
Can be cleaned and the screw shaft 130
As a result, the slide piece 110 moves in the stretching direction of the corona wire 140, so that the corona wire 140 can be cleaned over the entire length.

On the other hand, the slide top 110 has one end of the corona charger 125 as the home position, and when it moves to the other end during cleaning, it is detected by a sensor (micro switch) on the other end side (not shown). When the shaft 130 rotates in the reverse direction, the shaft 130 is returned to the home position. Further, a sensor (not shown) on one end side is arranged at the home position, and the slide piece 11
When 0 reaches the home position, it is detected by the one-end sensor and stops after the detection.

As described above, according to the third embodiment, the two rotating cylindrical cleaning pads 113 and 114 are used.
By cleaning the corona wire 140 using the entire surface of the corona wire 140, the area of the non-woven fabric when the dirt of the corona wire 140 is repaired is increased, and the dirt of the corona wire 140 can be efficiently removed.

For example, in the third embodiment, the effective area of the non-woven fabric that can be used to collect dirt on the corona wire 140 is the entire cylindrical surface, and the diameter of the cylindrical cleaning pads 113, 114 is 10 mm. If the length is 20 mm, the effective area is 10 mm × π × 20 mm × 2 = 12
It will be 57 mm ² . Further, in the conventional example, the effective area is only the contact portion of the corona wire 140 having a diameter of 0.06 mm, and even if the width of the cylindrical cleaning pads 113 and 114 is 10 mm, it is about 1 mm ² . This is significantly smaller than the configuration of the embodiment.

Further, according to the third embodiment, it is possible to prevent the dirt from accumulating only on the edge portion of the cleaning pad as in the conventional case, and to uniformly smear the circumferential surfaces of the cylindrical cleaning pads 113 and 114. Therefore, it is possible to suppress the repaired dirt from returning to the corona wire 140 again and improve the cleaning ability.

Further, according to the third embodiment, since this configuration can be realized by using the power of the motor of the screw shaft 130 which is the existing drive source, a new drive source is added. There is no need, and the above effects can be obtained with a simple configuration.

Furthermore, according to the third embodiment, since the corona wire 140 can be cleaned efficiently, the replacement life of the corona wire 140 can be extended.

In the third embodiment, the screw shaft 130 is removed from the cylindrical cleaning pads 113, 114.
Although frictional force is used as the means for transmitting the drive force to the above, the present configuration is not limited to this, and drive force transmitting means such as a gear or a belt may be used.

Further, in the third embodiment, two cylindrical cleaning pads 113 and 114 are used.
It may be one or three or more.

Furthermore, in the third embodiment,
Although a cleaning member made of a non-woven fabric is used, the present configuration is not limited to this, and as shown in FIG. 7, a brush-shaped cleaning member in which a brush is arranged on the peripheral surface of the core material may be used.

(Fourth Embodiment) A fourth embodiment of the present invention will be described below with reference to FIG. In the following description, parts that are not particularly described have the same configurations as those in the third embodiment.

FIG. 8 is a longitudinal front view of the wire cleaning device 124 according to the fourth embodiment.

In the fourth embodiment, as a characteristic difference from the above-described third embodiment, as shown in FIG. 8, the cylindrical cleaning pad 174 has a corona wire 170.
It is installed vertically to the suspension direction. Further, a conical driving force transmitting member 173 as a second power transmitting member, which is a drive system for driving the cylindrical cleaning pad 174.
Are integrally formed with the cylindrical cleaning pad 174. Although the number of the cylindrical cleaning pad 174 is one in FIG. 8, the number is not limited to this and may be one or more.

The slide shaft 175 has a screw shaft 1
An idler member 172 as a first power transmission member having a support shaft coaxial with 71 is rotatably attached, and the idler member 172 frictionally contacts the outer diameter portion of the screw shaft 171 to move in the axial direction. Rotational power is transmitted while moving. Also, the idler member 172
The frictional contact of the conical portion at the tip with the conical driving force transmitting member 173 as the second power transmitting member,
The torque of 71 is transmitted to a conical driving force transmitting member 173 having a rotation axis in a direction orthogonal to the screw axis.

According to this structure, the screw shaft 1
When 71 rotates in the direction of arrow w in the figure, slide piece 1
75 moves in the direction of arrow z in the figure, and the screw shaft 1
The cylindrical cleaning pad 174 rotates in the direction of the arrow y in the drawing together with the conical driving force transmitting member 173 via the idler member 172 which receives the power of 71 and rotates in the direction of the arrow x in the drawing.

According to the above-mentioned fourth embodiment, the same effect as that of the above-mentioned third embodiment can be obtained.

Further, according to the fourth embodiment, the moving speed of the cylindrical cleaning pad 174 with respect to the corona wire 170 is equal to the peripheral speed of the cylindrical cleaning pad 174 + the moving speed of the slide piece 175, which is the conventional speed. As described above, the cleaning power is improved as compared with the case where the cleaning is performed only by the moving speed of the slide piece 175.

[0074]

As described above, according to the present invention,
You can improve the cleaning ability to clean the corona wire,
The replacement life of the corona wire can be extended.

In particular, since the motive power for rotating the cleaning member uses the movement force associated with the movement of the pedestal and the rotation force of the screw shaft, a special motor or the like is not required.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a corona charger equipped with a wire cleaning device according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a corona charger equipped with a wire cleaning device according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a corona charger equipped with a wire cleaning device according to a third embodiment of the present invention.

FIG. 4 is a partially cutaway bottom view of a corona charger equipped with a wire cleaning device according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a drive system of a wire cleaning device according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a cylindrical cleaning pad of a wire cleaning device according to a third embodiment of the present invention.

FIG. 7 is a brush-like cylindrical cleaning member of a wire cleaning device according to a third embodiment of the present invention.

FIG. 8 is a front view in the longitudinal direction of a wire cleaning device according to a fourth embodiment of the present invention.

FIG. 9 is a partially cutaway perspective view of the corona charger to which the wire cleaning device shown in the first conventional example is attached.

FIG. 10 is a perspective view of a corona charger to which a wire cleaning device shown in a second conventional example is attached.

FIG. 11 is a detailed view of a pad portion of a conventional wire cleaning device.

[Explanation of symbols]

10 slide frames 10a extension part 11 slits 12 round balls 13 Drive wire 14 motor 15 Corona Wire 16 racks 17 Cleaning member 17a brush 17b Core material 18 Cleaning member 18a brush 18b core material 19 Support member 20 Support member 21, 22 pinion gear 23 pulley 24 wire cleaning device 25 Corona charger 50 Shield member 51, 52 gears 110 slide frames 112 protrusion 113, 114 Cylindrical cleaning pad 115 Corona Wire 116, 117 support members 118, 119 Cylindrical drive transmission member 120 idler components 124 wire cleaning device 125 corona charger 130 screw shaft 140 Corona Wire 150 Shield member 170 Corona Wire 171 screw shaft 172 idler member 173 Drive force transmission member 174 Cylindrical cleaning pad 175 slide frames 201 elastic member 202 pad 203 wire 204 motor 205 drive wire 206 screw shaft

Claims (17)

[Claims] 1. In a corona charger that applies a voltage to a stretched corona wire to perform discharge, a pedestal movable in the stretching direction of the corona wire, a pedestal driving means for moving the pedestal, and the pedestal. And a cleaning member that is rotatably supported by the supporting member and abuts against the corona wire to clean dirt of the corona wire. The cleaning member includes the corona wire. A corona charger characterized in that the corona charger rotates while being brought into contact with the base while being moved. 2. The corona charger according to claim 1, wherein a cleaning unit provided at one end of the rotating shaft of the cleaning member contacts the corona wire. 3. The corona charger according to claim 2, wherein a pair of the cleaning members are arranged on both sides of the corona wire so as to sandwich the corona wire. 4. The cleaning unit facing the pair of cleaning members rotate in directions opposite to each other.
Corona charger described in. 5. A first power transmission member provided on a shield member of the corona charger in a direction in which the corona wire is stretched, and a power is transmitted from the first power transmission member along with movement of the pedestal. A second power transmission member that is transmitted and rotated, and the cleaning member is rotated by the rotation of the second power transmission member being transmitted.
5. The corona charger according to any one of 4 to 4. 6. The power is transmitted from the first power transmission member to the second power transmission member by meshing between the first power transmission member and the second power transmission member. The corona charger according to claim 5, wherein 7. Power is transmitted from the first power transmission member to the second power transmission member by frictional force between the first power transmission member and the second power transmission member. The corona charger according to claim 5, wherein: 8. A drive wire that moves endlessly in a stretching direction of the corona wire, the pedestal being locked by the drive wire, and the pedestal being moved by the movement of the drive wire. The corona charger according to any one of claims 1 to 7. 9. A screw shaft is provided in a stretching direction of the corona wire, and the pedestal is engaged with the screw shaft,
The corona charger according to claim 1, wherein the pedestal is moved by rotationally driving the screw shaft. 10. The corona charger according to claim 9, wherein the cleaning member has a cylindrical cleaning portion having a rotating shaft coaxial with the axial direction of the screw shaft. 11. The corona charger according to claim 9, wherein the cleaning member has a cylindrical cleaning portion having a rotation shaft in a direction substantially orthogonal to the axial direction of the screw shaft. 12. The corona charger according to claim 10, wherein a pair of the cylindrical cleaning parts are arranged on both sides of the corona wire so as to sandwich the corona wire. 13. A first power transmission member to which the rotation of the screw shaft is transmitted, and a second power transmission member to which the rotation of the first power transmission member is transmitted, 13. The corona charger according to claim 9, wherein the cleaning member is rotated by the rotation of the second power transmission member being transmitted. 14. The corona charger according to claim 13, wherein the rotation is transmitted from the screw shaft to the cleaning member by friction or gears. 15. The corona charger according to claim 1, wherein the cleaning portion of the cleaning member is made of a non-woven fabric. 16. The corona charger according to claim 1, wherein the cleaning unit of the cleaning member is a brush. 17. An image forming apparatus, wherein the corona charger according to claim 1 is arranged facing a latent image carrier.