JP2021009245A - Cleaning member, charging device, and image forming apparatus - Google Patents

Abstract

To provide a cleaning member that can appropriately clean a charging roller.SOLUTION: A cleaning member 21 cleans a charging roller 20 that charges a photoreceptor drum 13. The cleaning member 21 comprises: a shank 30 that is arranged along an axial direction of the charging roller 20 and rotates around the axis; and a cleaning unit 31 that has a plurality of island-shaped members 32 having a polygonal shape when viewed from a radial direction and arranged and fixed onto an outer peripheral surface of the shank 30, has a plurality of spaces S between the adjacent island-shaped members 32, and rotates with the shank 30 while bringing the island-shaped members 32 into contact with the charging roller 20 to clean the charging roller 20.SELECTED DRAWING: Figure 3

Description

The present invention relates to a cleaning member, a charging device, and an image forming device for cleaning a charging roller that charges a photoconductor.

Patent Document 1 discloses a cleaning body for cleaning a charged roll. This cleaning body has a cleaning material spirally wound around the outer circumference of the shaft portion. The winding angle of the cleaning material is set smaller than that of the central portion at both ends in the axial direction of the shaft portion, and the cleaning ability of the cleaning material is high at both ends in the axial direction. As a result, a large amount of foreign matter is removed from both ends in the axial direction where the amount of foreign matter adhered is large on the surface of the charging roll.

Japanese Unexamined Patent Publication No. 2011-191548

However, since the cleaning material is formed in a spiral shape in the above-mentioned cleaning body, when the cleaning body rotates around the shaft, a force acts in the direction in which the spiral (screw) advances, and the balance of the forces applied to both ends of the shaft portion is balanced. It collapses. Then, since the rotational load of the shaft portion increases, the cleaning body cannot rotate smoothly, and the charging roll cannot be properly cleaned.

In order to solve the above problems, the present invention provides a cleaning member, a charging device and an image forming device capable of appropriately cleaning the charging roller.

In order to achieve the above object, the present invention is a cleaning member for cleaning a charging roller that charges a photoconductor, and has a shaft portion that is arranged along the axial direction of the charging roller and rotates around the axis, and a diameter. A plurality of island-shaped members having a polygonal shape when viewed from the direction are arranged and fixed on the outer peripheral surface of the shaft portion, have a plurality of spaces between the adjacent island-shaped members, and the island-shaped members are formed by the charging roller. A cleaning unit for cleaning the charging roller by rotating with the shaft portion while in contact with the charging roller is provided.

In this case, the island-shaped member has a polygonal shape that is axisymmetric with respect to an imaginary line that bisects one corner when viewed from the radial direction, and one corner is located downstream in the rotation direction. It is preferable that the imaginary line is fixed to the outer peripheral surface of the shaft portion in a posture in which the virtual line is oriented in parallel with the rotation direction.

In this case, it is preferable that the island-shaped member is formed in a rhombus shape when viewed from the radial direction, and is fixed to the outer peripheral surface of the shaft portion in a posture in which the diagonal line of the rhombus is directed parallel to the rotation direction of the shaft portion.

In this case, it is preferable that the plurality of island-shaped members are arranged so as to be line-symmetrical with respect to the central circumferential line that bisects the shaft portion.

In this case, it is preferable that the number of the island-shaped members arranged gradually or gradually increases from the central region in the axial direction of the shaft portion toward both outer sides.

In order to achieve the above object, the charging device according to the present invention includes a charging roller for charging a photoconductor and a cleaning member according to any one of the above, which rotates while contacting the charging roller to clean the charging roller. And equipped with.

In order to achieve the above object, the image forming apparatus according to the present invention includes the above charging apparatus.

According to the present invention, the charging roller can be properly cleaned.

It is a schematic (side view) which shows the internal structure of the printer which concerns on one Embodiment of this invention. It is a schematic (side view) which shows the image-making unit of the printer which concerns on one Embodiment of this invention. It is sectional drawing (plan view) which shows the photoconductor drum and the charging device of the printer which concerns on one Embodiment of this invention. It is a developed view which shows the cleaning member which concerns on one Embodiment of this invention. It is a developed view which shows the part of the cleaning member which concerns on one Embodiment of this invention in an enlarged manner. It is an enlarged view which shows a part of the cleaning member which concerns on the modification of one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawing, "Fr" indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates "U". "Upper" and "D" indicate "lower". Although terms indicating directions and positions are used in the present specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[Printer overview]
The printer 1 as an example of the image forming apparatus will be described. FIG. 1 is a schematic view (side view) showing the internal configuration of the printer 1. FIG. 2 is a schematic view (side view) showing the image forming unit 11 of the printer 1. FIG. 3 is a cross-sectional view (plan view) showing the photoconductor drum 13 and the charging device 14.

As shown in FIG. 1, the printer 1 includes a device main body 2 that constitutes a substantially rectangular parallelepiped appearance. A paper feed cassette 3 for accommodating a paper sheet (not shown) is detachably provided on the lower side of the apparatus main body 2. A paper output tray 4 is provided on the upper surface of the apparatus main body 2.

The printer 1 includes a paper feeding device 5, an image forming unit 6, and a fixing device 7 inside the apparatus main body 2. The paper feed device 5 is provided at the upstream end of the transport path 8 extending from the paper feed cassette 3 to the paper output tray 4. The fixing device 7 is provided on the downstream side of the transport path 8, and the image forming unit 6 is provided between the paper feeding device 5 and the fixing device 7 on the transport path 8.

The image forming unit 6 includes a toner container 10, an image forming unit 11, and an optical scanning device 12. The image forming unit 11 is arranged behind the toner container 10, and the optical scanning device 12 is arranged in front of the toner container 10. The image forming unit 6 performs a monochrome image forming process on a sheet based on image data transmitted from, for example, a personal computer (not shown) or the like.

The toner container 10 is formed in a hollow box shape and contains, for example, a black replenishing toner (developer). The optical scanning device 12 is a device that irradiates the surface of the charged photoconductor drum 13 with scanning light to form an electrostatic latent image.

As shown in FIGS. 1 and 2, the image forming unit 11 includes a photoconductor drum 13, a charging device 14, a developing device 15, a transfer roller 16, and a cleaning device 17. The charging device 14, the developing device 15, the transfer roller 16, and the cleaning device 17 are arranged around the photoconductor drum 13 in the order of the transfer process (see arrow X).

<Photoreceptor drum>
As shown in FIGS. 2 and 3, the photoconductor drum 13 is formed in a cylindrical shape that is long in the left-right direction. The photoconductor drum 13 has a conductive drum base tube 13A and a photosensitive layer 13B formed on the outer peripheral surface of the drum base tube 13A. A drive device (not shown) such as a motor is connected to one end of the photoconductor drum 13 (drum base tube 13A) in the axial direction via a drive transmission mechanism such as a gear train. The photoconductor drum 13 is rotationally driven around an axis by a driving device.

<Charging device>
The charging device 14 includes a charging roller 20 for charging the photoconductor drum 13 and a cleaning member 21 for cleaning the charging roller 20. The charging device 14 brings the charging roller 20 into contact with the photoconductor drum 13 (the photosensitive layer 13B) to uniformly charge the photosensitive layer 13B with a predetermined polarity and potential (contact charging method).

(Charging roller)
The charging roller 20 is formed in a columnar shape long in the left-right direction, and is provided in parallel with the photoconductor drum 13. The charging roller 20 includes a conductive charging shaft 20A and a charging rubber layer 20B formed on the outer peripheral surface of the charging shaft 20A. Both ends of the charging shaft 20A in the axial direction (left-right direction) are supported by bearing portions 23 of a pair of support members 22. Each support member 22 is urged (pressed) toward the photoconductor drum 13 by an urging member 25 such as a coil spring. The charged rubber layer 20B is made of, for example, a material in which an ionic conductive agent is mixed with epichlorohydrin rubber or the like, and has conductivity.

The charging roller 20 is urged by each urging member 25 to come into contact with the photoconductor drum 13 with a predetermined pressure, and rotates about an axis according to the rotation of the photoconductor drum 13. Further, the charging roller 20 is connected to a power source (not shown) for applying a charging bias, and the photoconductor drum 13 (photosensitive layer 13B) is charged by the applied charging bias.

(Cleaning member)
The cleaning member 21 is arranged on the opposite side of the photoconductor drum 13 with the charging roller 20 interposed therebetween. The cleaning member 21 is formed in a substantially cylindrical shape long in the left-right direction, and is provided in parallel with the charging roller 20. The cleaning member 21 is supported by a bearing portion 24 of a pair of support members 22. The cleaning member 21 contacts the charging roller 20 with a predetermined pressure and rotates about an axis according to the rotation of the charging roller 20. In this way, the cleaning member 21 rotates while in contact with the charging roller 20 to clean the charging roller 20. The details of the cleaning member 21 will be described later.

<Developer>
As shown in FIG. 2, the developing apparatus 15 includes a developing roller 15A provided in parallel with the photoconductor drum 13 and with a gap between the photoconductor drum 13 and the photoconductor drum 13. A developing bias is applied from the power source to the developing roller 15A, and toner is supplied to the electrostatic latent image on the photoconductor drum 13 while rotating about an axis (the electrostatic latent image is developed to form a toner image).

<Transfer roller>
The transfer roller 16 is provided parallel to the photoconductor drum 13 and is in contact with the photoconductor drum 13 with a predetermined pressure. The transfer roller 16 presses the sheet against the photoconductor drum 13 and transfers the toner image developed on the photoconductor drum 13 to the sheet.

<Cleaning device>
The cleaning device 17 has a cleaning blade 17A in contact with the surface of the photoconductor drum 13. As the photoconductor drum 13 rotates, the tip of the cleaning blade 17A moves relative to the surface of the photoconductor drum 13 while being in contact with the surface of the photoconductor drum 13, and removes the toner left on the surface of the photoconductor drum 13. Further, the cleaning device 17 has a discharge screw 17B for discharging the removed toner to a waste toner bottle (not shown).

A static elimination device 18 for irradiating static elimination light for removing the charge remaining on the photosensitive layer 13B of the photosensitive drum 13 is provided between the charging device 14 and the cleaning device 17.

[Image formation process]
Here, the operation of the printer 1 will be described. The control device (not shown) of the printer 1 appropriately controls each device, and executes the image forming process as follows. The charging device 14 charges the surface of the photoconductor drum 13 to a predetermined potential. The photoconductor drum 13 receives scanning light (see arrow P shown in FIGS. 1 and 2) emitted from the optical scanning device 12 and carries an electrostatic latent image. The developing device 15 develops an electrostatic latent image on the photoconductor drum 13 into a toner image using the toner supplied from the toner container 10. The sheet is sent out from the paper feed cassette 3 to the transport path 8 by the paper feed device 5. The transfer roller 16 transfers the toner image on the photoconductor drum 13 to a sheet that passes between the photoconductor drum 13 and the photoconductor drum 13. The fixing device 7 heat-fixes the toner image to the sheet. After that, the sheet is ejected to the output tray 4. The cleaning device 17 (cleaning blade 17A) removes the toner remaining on the photoconductor drum 13, and the static elimination device 18 removes the electric charge remaining on the photosensitive layer 13B of the photoconductor drum 13.

[Structure of cleaning member]
Next, the structure of the cleaning member 21 will be described with reference to FIGS. 3 to 5. FIG. 4 is a developed view showing the cleaning member 21. FIG. 5 is an enlarged view showing a part of the cleaning member 21.

As shown in FIG. 3, the cleaning member 21 includes a shaft portion 30 and a cleaning portion 31.

<Shaft>
The shaft portion 30 is made of a metal such as an aluminum alloy or stainless steel, and is formed in a long columnar shape in the left-right direction. The shaft portion 30 is arranged parallel to the charging roller 20 (along the axial direction of the charging roller 20). Both ends of the shaft portion 30 in the axial direction are supported by the bearing portions 24 of the pair of support members 22, and the shaft portion 30 rotates around the shaft.

<Cleaning section>
The cleaning unit 31 includes a plurality of island-shaped members 32. The axial length of the cleaning portion 31 (distance between the island-shaped members 32 at both ends in the axial direction) is formed longer than the image forming region (region to which toner adheres) of the photoconductor drum 13. Since each of the plurality of island-shaped members 32 has substantially the same shape, one island-shaped member 32 will be described below unless otherwise specified.

As shown in FIG. 4, the island-shaped member 32 has a rhombus shape when viewed from the radial direction of the shaft portion 30 (a polygonal shape that is axisymmetric with respect to a virtual line (diagonal line D) that bisects one corner portion 32A). Is formed in. To be precise, the island-shaped member 32 is formed in a square columnar shape having a rhombic cross section. The island-shaped member 32 is made of an elastically deformable porous material such as urethane sponge. The plurality of island-shaped members 32 are arranged on the outer peripheral surface of the shaft portion 30, and are fixed to the outer peripheral surface of the shaft portion 30 with an adhesive, double-sided tape, or the like. Further, a plurality of spaces S are formed between the adjacent island-shaped members 32. The outer peripheral surface of the shaft portion 30 is exposed in the space S. It should be noted that the fact that the island-shaped member 32 is formed in a rhombus does not mean that it is required to be a perfect rhombus in a strict sense, but it means that some error is allowed.

More specifically, as shown in FIG. 5, the island-shaped member 32 has an outer peripheral surface of the shaft portion 30 in a posture in which one corner portion 32A is directed to the downstream side in the rotation direction of the shaft portion 30 when viewed from the radial direction. It is fixed to. Further, the island-shaped member 32 is fixed to the outer peripheral surface of the shaft portion 30 in a posture in which a virtual line that bisects the corner portion 32A, that is, a rhombic diagonal line D is oriented parallel to the rotation direction. The pair of edges 32B on the downstream side in the rotational direction of the island-shaped member 32 extend obliquely from the corners 32A toward both outer sides in the axial direction toward the upstream side in the rotational direction. Since the rhombus has a shape that is axisymmetric with respect to the diagonal line D, the pair of edges 32B are inclined at the same angle θ with respect to the tangent line T extending in the axial direction (left-right direction) in contact with the corner portion 32A. , Formed to the same length. In this specification, the angle formed by the pair of edges 32B and the tangent line T is also referred to as an “approach angle θ”. Further, the fact that the approach angles θ and the lengths of the pair of edges 32B are the same does not mean that they are required to be completely the same, but that some errors are allowed.

As shown in FIG. 4, the plurality of island-shaped members 32 are arranged so as to be line-symmetrical with respect to the central circumferential line C that bisects the shaft portion 30. Further, the number of island-shaped members 32 arranged increases stepwise from the central region R1 in the axial direction of the shaft portion 30 toward both outer sides.

To be described in detail, the plurality of island-shaped members 32 are arranged at equal intervals in the circumferential direction of the shaft portion 30 to form a member row 32L (see the two-dot chain line in FIG. 4). The plurality of member rows 32L are arranged at equal intervals (adjacent) in the axial direction of the shaft portion 30. On the other hand, the shaft portion 30 includes a central region R1 in the axial direction, a pair of intermediate regions R2 outside the central region R1 in the axial direction, and a pair of outer regions R3 outside the pair of intermediate regions R2 in the axial direction. It is divided into. The central region R1 is provided with five member rows 32L, each intermediate region R2 is provided with three member rows 32L, and each outer region R3 is provided with two member rows 32L.

Further, in each of the regions R1 to R3, the number (arrangement number) of the island-shaped members 32 constituting the member row 32L is different. Specifically, the number of island-shaped members 32 arranged is larger in the regions R2 and R3 outside the central region R1 in the axial direction. More specifically, in the central region R1, the intermediate region R2, and the outer region R3, the ratio of the number of arranged island-shaped members 32 constituting one member row 32L is set to "1: 2: 3". .. In this way, the number of island-shaped members 32 arranged varies in three stages in the axial direction of the shaft portion 30. In other words, the total area of the island-shaped members 32 in each region R1 to R3 gradually increases from the central region R1 toward both outer regions R2 and R3, and the space S in each region R1 to R3. The total area of is gradually decreasing from the central region R1 toward both outer regions R2 and R3.

Further, in each of the regions R1 to R3, the plurality of island-shaped members 32 constituting the member row 32L are arranged at equal intervals in the circumferential direction (rotational direction). To be precise, in the central region R1 and the intermediate region R2, the plurality of island-shaped members 32 constituting the member row 32L are arranged in the circumferential direction with a gap (space S) in between, and are arranged in a substantially staggered manner. .. In the member row 32L of the outer region R3, a plurality of island-shaped members 32 are continuously arranged in the circumferential direction without a gap. Further, in each of the regions R1 to R3, the adjacent member rows 32L (adjacent island-shaped members 32) are displaced in the circumferential direction.

The number of divisions of the axial regions R1 to R3 of the shaft portion 30 and its range, the number of member rows 32L in each region R1 to R3, the number of island-shaped members 32 constituting the member rows 32L, and each of them. The ratio of the number of arrangements of the island-shaped members 32 in the regions R1 to R3 is an example, and is not limited to these, and the size (length, diameter) of the shaft portion 30 and the size of the island-shaped members 32. It can be changed as appropriate according to the conditions.

[Action of cleaning member]
Next, the operation of the cleaning member 21 will be described.

As described above, when the image forming process is executed, foreign matter such as toner left on the photoconductor drum 13 without being transferred to the sheet is removed from the photoconductor drum 13 by the cleaning device 17. Foreign substances such as external additives having a small particle size among the toner components pass through the cleaning device 17 (cleaning blade 17A) and adhere to the surface of the charging roller 20.

The foreign matter adhering to the charging roller 20 is removed by the cleaning member 21 that comes into contact with the charging roller 20 and rotates in a driven manner. Specifically, the cleaning unit 31 of the cleaning member 21 cleans the charging roller 20 by rotating the island-shaped member 32 together with the shaft portion 30 while contacting the charging roller 20 (see FIGS. 2 and 3).

More specifically, when the cleaning member 21 rotates, the corner portion 32A (see FIG. 5) of the island-shaped member 32 first comes into contact with the surface of the charging roller 20. When the corner portion 32A further rotates while contacting the charging roller 20, the pair of edges 32B (see FIG. 5) of the island-shaped member 32 come into contact with the surface of the charging roller 20 with the same approach angle θ. In this way, the corner portion 32A and the pair of edges 32B rotate (relatively) while in contact with the surface of the charging roller 20 to scrape off the foreign matter adhering to the surface of the charging roller 20. Since the plurality of island-shaped members 32 are arranged over the entire axial direction of the shaft portion 30, the plurality of corner portions 32A and the plurality of edges 32B clean substantially the entire surface of the charging roller 20.

In the cleaning member 21 according to the present embodiment described above, a plurality of island-shaped members 32 are arranged and fixed on the outer peripheral surface of the shaft portion 30. Further, each island-shaped member 32 was formed in a rhombus (polygonal shape) when viewed from the radial direction. According to this configuration, the corners 32A and edges 32B of the plurality of island-shaped members 32 can be brought into contact with the surface of the charging roller 20, and the plurality of corners 32A and the plurality of edges 32B adhere to the surface of the charging roller 20. It is possible to scrape off foreign matter. Further, even if the cleaning member 21 rotates while being in contact with the charging roller 20, a force traveling in only one of the axial directions does not act, so that a force applied to both ends (bearing portion 24) of the shaft portion 30 in the axial direction. The balance can be maintained almost uniformly. Further, if a seamless cleaning portion (urethane sponge or the like) is fixed to the entire outer peripheral surface of the shaft portion 30, the contact resistance with the charging roller 20 increases, and the charging roller 20 and the cleaning member 21 rotate smoothly. become unable. In this regard, according to the cleaning member 21 according to the present embodiment, the increase in contact resistance with the charging roller 20 can be suppressed by interspersing the plurality of island-shaped members 32 with the plurality of spaces S interposed therebetween. .. As a result, the charging roller 20 can be properly cleaned.

Further, in the cleaning member 21 according to the present embodiment, the corner portion 32A of the island-shaped member 32 is directed to the downstream side in the rotation direction, and the diagonal line D at which the island-shaped member 32 bisects the corner portion 32A is parallel to the rotation direction. It was set up to be. According to this configuration, the approach angle θ and the length of the pair of edges 32B can be made the same. As a result, the island-shaped member 32 is prevented from hitting the charging roller 20 on one side, such as one of the pair of edges 32B strongly hitting the charging roller 20, so that the charging roller 20 can be appropriately cleaned. Further, since the pair of edges 32B are line-symmetrical with respect to the diagonal line D, when the island-shaped member 32 rotates while contacting the charging roller 20, a force toward one axial direction and a force toward the other in the axial direction. Can be offset. As a result, the force applied to both ends (bearing portion 24) of the shaft portion 30 in the axial direction can be maintained substantially uniformly.

Further, in the cleaning member 21 according to the present embodiment, since the plurality of island-shaped members 32 are arranged line-symmetrically with respect to the central circumferential line C, the force applied to both ends of the shaft portion 30 in the axial direction is substantially omitted. Can be maintained uniformly.

As described above, the charging roller 20 is pressed against the photoconductor drum 13 by the urging members 25 arranged at both ends in the axial direction thereof. Therefore, the central portion of the charging roller 20 in the axial direction is slightly bent so as to bite into the cleaning member 21. As a result, the contact resistance between the charging roller 20 and the cleaning member 21 tends to increase in the central portion rather than the outer side in the axial direction. In this respect, in the cleaning member 21 according to the present embodiment, the number of island-shaped members 32 arranged is smaller in the central region R1 than in the regions R2 and R3 on both outer sides of the shaft portion 30 in the axial direction. According to this configuration, the contact resistance between the charging roller 20 and the cleaning member 21 can be reduced at the central portion in the axial direction. As a result, the rotational load of the charging roller 20 can be reduced while maintaining high cleaning performance of the cleaning member 21.

[Modification example]
In the cleaning member 21 according to the present embodiment described above, the island-shaped member 32 is formed in a rhombus shape (a square columnar shape having a rhombus cross section) when viewed from the radial direction, but the present invention is not limited to this. For example, the island-shaped member 32 may be formed in a square (or rectangular shape) when viewed in the radial direction (not shown). Even in this case, it is preferable that the island-shaped member 32 is provided in a posture in which the diagonal line D of the square is oriented parallel to the rotation direction. In addition, the island-shaped member 32 may be formed in a polygonal shape other than a quadrangle when viewed in the radial direction. For example, as shown in FIG. 6, the island-shaped member 33 according to the modified example is formed in an isosceles triangle (triangular columnar shape) when viewed from the radial direction. In this case, the island-shaped member 33 has a vertical line V (a vertical line V) that directs the apex angle 33A (pair of edges 33B) toward the downstream side in the rotation direction and bisects the apex angle 33A (corner portion) when viewed from the radial direction. It is preferable that the virtual line) is fixed to the outer peripheral surface of the shaft portion 30 in a posture parallel to the rotation direction. The island-shaped member 33 may be formed in an equilateral triangle (not shown). In addition, the island-shaped member may have a polygonal shape that is line-symmetrical with respect to the virtual line that bisects the corners when viewed from the radial direction. For example, the island-shaped member may have a polygonal shape such as a pentagon or a hexagon. It may be formed in (not shown). That is, it is preferable that the island-shaped members 32 and 33 have a shape that is line-symmetrical with respect to the virtual line that bisects the corner portion.

Further, in the cleaning member 21 according to the present embodiment, the plurality of island-shaped members 32 and 33 are arranged symmetrically with respect to the central circumferential line C, but the present invention is not limited to this. For example, if the region where the contact resistance between the charging roller 20 and the cleaning member 21 increases is deviated from the center in the axial direction, the arrangement of the plurality of island-shaped members 32 and 33 may be shifted accordingly (FIG. FIG. Not shown). That is, the plurality of island-shaped members 32 and 33 may be arranged asymmetrically with the central circumference line C as the axis.

Further, in the cleaning member 21 according to the present embodiment, the number of the island-shaped members 32 and 33 arranged is changed in three stages in the axial direction of the shaft portion 30, but the present invention is not limited to this. For example, the number of island-shaped members 32, 33 constituting the member row 32L is changed for each row, and the number of island-shaped members 32, 33 arranged gradually increases from the central region R1 toward both outer sides in the axial direction. It may be increased. In addition, for example, if the contact resistance between the charging roller 20 and the cleaning member 21 is substantially uniform in the axial direction, the number of island-shaped members 32 and 33 arranged does not increase or decrease over the axial direction of the shaft portion 30. It may be evenly arranged over the axial direction (not shown). That is, the total area of the island-shaped members 32 and 33 in each of the regions R1 to R3 may be the same. In addition, some of the plurality of island-shaped members 32 and 33 are arranged in a substantially staggered manner with a deviation in the circumferential direction, but not limited to this, all the island-shaped members 32 and 33 are arranged in a grid pattern. It may be arranged (not shown).

Further, in the description of the above embodiment, the case where the present invention is applied to the printer 1 is shown as an example, but the present invention is not limited to this, and the present invention is applied to, for example, a color printer, a copying machine, a facsimile or a multifunction device. You may.

The description of the above embodiment shows one aspect of the cleaning member, the charging device, and the image forming device according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1 Printer (image forming device)
13 Photoreceptor drum (photoreceptor)
14 Charging device 20 Charging roller 21 Cleaning member 30 Shaft part 31 Cleaning part 32, 33 Island-shaped member 32A Corner 33A Top angle (corner)
C Central circumference line D Diagonal line S Space V Vertical line (virtual line)

Claims (7)

A cleaning member that cleans the charging roller that charges the photoconductor.
A shaft portion that is arranged along the axial direction of the charging roller and rotates around the shaft, and
A plurality of island-shaped members having a polygonal shape when viewed from the radial direction are arranged and fixed on the outer peripheral surface of the shaft portion, and a plurality of spaces are provided between the adjacent island-shaped members, and the island-shaped members are charged. A cleaning member including a cleaning unit that cleans the charging roller by rotating with the shaft portion while in contact with the roller. The island-shaped member has a polygonal shape that is line-symmetrical with respect to an imaginary line that bisects one corner when viewed from the radial direction, and has one corner facing downstream in the rotation direction. The cleaning member according to claim 1, wherein the virtual line is fixed to the outer peripheral surface of the shaft portion in a posture parallel to the rotation direction. The island-shaped member is formed in a rhombus shape when viewed from the radial direction, and is fixed to the outer peripheral surface of the shaft portion in a posture in which the diagonal line of the rhombus is directed parallel to the rotation direction of the shaft portion. The cleaning member according to 1. The cleaning member according to any one of claims 1 to 3, wherein the plurality of island-shaped members are arranged so as to be line-symmetrical with respect to a central circumferential line that bisects the shaft portion. .. The number of the island-shaped members according to any one of claims 1 to 4, wherein the number of arranged island-shaped members gradually or gradually increases from the central region of the shaft portion in the axial direction toward both outer sides. Cleaning member. A charging roller that charges the photoconductor,
The charging device comprising the cleaning member according to any one of claims 1 to 5, which rotates while contacting the charging roller to clean the charging roller. An image forming apparatus comprising the charging apparatus according to claim 6.

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