JPH08164627A - Image formation device - Google Patents

Abstract

PURPOSE: To positively remove unnecessary toner stuck to an aperture electrode with a simple structure. CONSTITUTION: A toner roller 33 of a toner supply mechanism is formed having a conductive rubber sleeve outwardly fitted on the outer periphery of the roller main body made of synthetic resin foam body, the outer periphery thereof being formed with a plurality of pin members. Through the rotation of the toner carrying roller 33, the opening 42 of the aperture electrode 40 and the vicinity thereof are cleaned individually by pin members 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an image forming apparatus applicable to a copying machine, a printer, a facsimile, a plotter, etc., and controls the voltage of control electrodes of a plurality of openings formed in an aperture electrode body. In regard to the image forming apparatus for recording the toner that has passed through the opening by adhering it to the recording medium,
In particular, the present invention relates to a cleaning device for cleaning toner adhering to the opening of the aperture electrode body and the vicinity thereof.

[0002]

2. Description of the Related Art Conventionally, the applicant of the present invention has disclosed in Japanese Patent Laid-Open No. 6-799
As described in Japanese Patent Application Laid-Open No. 07-2007, an aperture electrode having a large number of minute apertures (apertures) arranged in a row in the width direction of a recording medium and having an electrode array made up of control electrodes provided in each of these many apertures. A toner supply roller that has a body and has a toner conveyance roller that conveys toner to a large number of openings of this aperture electrode body, and a toner regulation blade that presses and contacts the toner conveyance roller to regulate the amount of toner conveyed by the toner conveyance roller. A mechanism is provided, and a back electrode for generating an electric field is provided on the side opposite to the toner supply mechanism with respect to the aperture electrode body, and the drive voltage supplied to the electrode array is individually controlled while recording along the back electrode. By transporting the medium, the toner transported by the toner transport roller passes through the opening, and the electrostatic attraction force of the back electrode causes
It jumps out toward the back electrode and is attached to the recording medium,
After that, an image forming apparatus was proposed in which a toner image is formed by performing a fixing process.

In this image forming apparatus, each of the plurality of openings formed in the aperture electrode body comes into pressure contact with the toner adhering to the toner carrying roller, so that the surface of the toner carrying roller is firmly attached. Each of the openings comes into contact with the aggregated toner adhering to the toner, and the aggregated toner is disentangled so as to be movable. At the time of image formation, the disentangled toner passes through the opening. By the way, at the time of image formation, all the toner supplied to the opening does not pass through the opening, and the toner not provided for image formation is caused by friction between the aperture electrode body and the toner transport roller due to the pressing state. The frictional heat causes it to melt to some extent, making it easier to adhere to the vicinity of the opening.

That is, when the amount of toner fixed near the opening increases, unnecessary toner adheres to and accumulates in the opening, and the size of the opening is reduced. The amount of toner that passes through
The image density becomes low, or the toner accumulated in the opening is subjected to a large electrostatic force by the back electrode and flies toward and adheres to the recording medium even when the image is not being formed, resulting in stains on the recording medium. Further, there is a problem that a large amount of toner fixed near the opening causes short-circuiting between the adjacent openings, damaging the electronic components.

Therefore, the inventor of the present application provides an aperture electrode body with an image forming position where a plurality of openings are located between the toner transport roller and the back electrode, and the aperture electrode body extends from the image forming position. The position can be switched to the cleaning position moved in the direction, and an electrode body drive mechanism for switching the aperture electrode body between the image forming position and the cleaning position is provided to switch the position of the aperture electrode body to the cleaning position. It was conceived that the aperture electrode body is cleaned with a brush or the like provided in the cleaning mechanism to clean unnecessary toner adhered to the opening of the aperture electrode body or the vicinity thereof.

[0006]

However, as invented by the inventor of the present application, when the aperture electrode body whose position has been switched to the cleaning position is to be cleaned, the aperture electrode body is set at the image forming position and the cleaning position. In addition to the position switchable structure, an electrode body drive mechanism and a cleaning mechanism are additionally provided, which complicates the cleaning mechanism, increases the size of the image forming apparatus and increases the cost, and the aperture electrode. In order to clean the body, the image forming process is interrupted each time, and the image forming process efficiency decreases,
There are problems such as.

An object of the present invention is to provide an image forming apparatus capable of reliably cleaning unnecessary toner adhering to the aperture electrode body while executing the image forming process without separately providing a cleaning mechanism. is there.

[0008]

According to another aspect of the present invention, there is provided an image forming apparatus, wherein a plurality of openings are provided in an insulating sheet in a direction orthogonal to a conveying direction of an image recording medium, and a plurality of openings are provided near the openings. Aperture electrode body formed with an electrode array consisting of control electrodes, a toner supply mechanism for supplying toner to the electrode array of the aperture electrode body, and a gap for conveying the image recording medium with respect to the electrode array of the aperture electrode body. An image forming apparatus including a back surface electrode facing in close proximity and an electrode control unit individually controlling a drive voltage applied to a plurality of control electrodes of an electrode array based on an image signal is driven to rotate a toner supply mechanism. A toner transport roller that
A toner conveying roller that supplies the toner attached to the outer peripheral surface to the electrode array, and a plurality of openings of the aperture electrode body that are provided on the outer peripheral surface of the toner conveying roller and contact the aperture electrode body from the toner supply side. And a cleaning member for cleaning the vicinity of the.

According to a second aspect of the present invention, in the first aspect of the invention, the cleaning member is provided on the outer peripheral surface of the toner transport roller in a spiral shape with a fine pitch shift in the roller circumferential direction. A plurality of pin members projecting from the outer peripheral surface of the roller by a predetermined minute height, wherein at least one pin member is provided so as to correspond to each opening of the aperture electrode body in the roller axial direction of the toner transport roller. It is composed of a pin member.

According to a third aspect of the present invention, in the image forming apparatus according to the first aspect, the cleaning member extends linearly in the roller axial direction of the toner conveying roller and is arranged at predetermined intervals in the circumferential direction of the roller outer peripheral surface. The cleaning blade is provided with a plurality of cleaning blades protruding from the outer peripheral surface of the roller by a predetermined minute height. An image forming apparatus according to a fourth aspect is the image forming apparatus according to the first aspect, wherein the cleaning member is a cleaning blade spirally provided on the outer peripheral surface of the roller so that the cleaning member protrudes from the outer peripheral surface of the toner conveying roller by a predetermined minute height. It is composed.

[0011]

In the image forming apparatus according to the present invention, the aperture electrode body is formed by forming a plurality of openings in the insulating sheet and an electrode array consisting of a plurality of control electrodes located in the vicinity of these openings. The back electrode closely faces the electrode array with a conveyance gap of the image recording medium therebetween, toner is supplied to the electrode array by a toner supply mechanism, and the electrode control means causes the plurality of electrodes of the electrode array to be supplied based on the image signal. By individually controlling the drive voltage applied to the control electrode, the toner is caused to fly and an image is recorded through the electric field between the control electrode and the toner supply mechanism and the electric field between the control electrode and the back electrode.

By the way, the toner transport roller is provided in the toner supply mechanism so as to be rotationally driven, and supplies the toner attached to the outer peripheral surface to the electrode array. A cleaning member is provided on the outer peripheral surface of the toner transport roller, and the cleaning member comes into contact with the aperture electrode body from the toner supply side to perform a plurality of openings of the aperture electrode body while performing an image forming process. Since those neighboring portions are repeatedly cleaned, the aperture electrode body can be easily cleaned without separately providing a cleaning mechanism or an electrode body driving mechanism, and the image forming processing efficiency can be improved.
Since the flying property of the toner is enhanced, the image quality of the image can be enhanced.

In the image forming apparatus according to the second aspect of the present invention, the same operation as that of the first aspect is achieved, but the cleaning member is provided on the outer peripheral surface of the toner transport roller in a spiral shape with a fine pitch shift in the roller circumferential direction. And a plurality of pin members protruding from the roller outer peripheral surface by a predetermined minute height, in the roller axial direction of the toner transport roller,
Since at least one pin member is composed of a plurality of pin members provided so as to correspond to the respective openings of the aperture electrode body, each pin member is individually and repeatedly arranged in the corresponding openings and their vicinity. By contacting each other, it is possible to efficiently and surely clean each opening and the vicinity thereof.

Here, the toner transport roller is rotationally driven so that the peripheral speed due to the rotation of the toner transport roller becomes faster than the transport speed of the image recording medium, and thereby pixel formation is performed by the flight of toner passing through the opening. There is nothing to prevent.

In the image forming apparatus of the third aspect, the same operation as that of the second aspect is achieved, but the cleaning member extends linearly in the roller axial direction of the toner conveying roller and is arranged in the circumferential direction of the outer peripheral surface of the roller. Since it is composed of a plurality of cleaning blades that are provided at intervals and project a predetermined minute height from the outer peripheral surface of the roller, each of these cleaning blades can repeatedly and repeatedly clean a plurality of openings. Since the cleaning blade of 1 is simply fixed and provided in a straight line, the manufacturing of the toner conveying roller is simplified.

In the image forming apparatus of claim 4, the same operation as in claim 2 is achieved, but the cleaning member spirals on the outer peripheral surface of the roller so that the cleaning member protrudes from the outer peripheral surface of the toner conveying roller by a predetermined minute height. Since it is composed of the cleaning blades provided in a circular shape, the opening from the one end to the opening of the other end and the vicinity thereof can be sequentially and repeatedly cleaned, and the cleaning blade is spirally wound. Since it is only fixed by fixing it, manufacturing of the toner transport roller is further simplified.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the image forming apparatus 1 is an image recording apparatus applicable to a copying machine, a printer, a facsimile, a plotter, and the like. The image forming apparatus 1 has a sheet P (image A paper transport mechanism 10 that transports a recording medium, a fixing mechanism 20, a predetermined amount of toner 3, a toner supply mechanism 30, and the toner supply mechanism 30.
The aperture electrode body 40 attached to the upper end of the toner case 31 and the back electrode roller 50 disposed with a gap between the aperture electrode body 40 and the sheet transporting gap are provided.

The sheet transport mechanism 10 includes a plurality of guide plates 12 to 14 for supporting the sheet P to be transported, a plurality of transport rollers 15 and 16, and a transport roller 15 ,.
16 and a fixing mechanism 20. A conveyance roller (not shown) that supports and conveys a portion of the paper P at both ends in the width direction of several mm, and a paper feed roller that feeds the papers in the paper cassette 11 one by one. (Not shown), a roller driving mechanism (not shown) for driving the paper transport mechanism 10, and the like. A paper feed cassette 11 storing a large number of recording papers P is provided on the front side of the main body frame 2, and the main body is also provided. On the rear side of the frame 2, a paper discharge tray 1 for receiving the recorded and discharged paper P
9 are provided. The fixing mechanism 20 includes a fixing roller 17 having a halogen lamp built therein and a pressing roller 18, and fixes the toner 3 recorded on the lower surface of the paper P by heating and pressing the toner 3.

Next, the toner supply mechanism 30 will be explained. In the toner case 31 having a width wider than the maximum width of the paper P in the direction orthogonal to the paper conveying direction (from front to back), toner having electric insulation is provided. 3 is stored. Inside the toner case 31, a toner supply roller 32
And a toner conveyance roller 33 are horizontally arranged in the left-right direction, and the rollers 32 and 33 are rotatably supported. The toner supply roller 32 is made of silicone foam, and the toner supply roller 3
2 transfers the toner 3 to the toner transport roller 33 and charges the toner 3 to the negative electrode through frictional contact with the toner 3.

The toner carrying roller 33 has a structure in which a conductive rubber sleeve 33b is externally fitted to the outer circumference of a roller body 33a made of a synthetic resin foam made of an insulating material. The toner 3 attached by electrostatic force is conveyed in the direction of arrow A. The toner supply roller 32 and the toner transport roller 33 are
A roller driving mechanism (not shown) rotationally drives in the directions of arrow B and arrow A. The toner transport roller 33
In some cases, an insulating coating made of synthetic resin or a semi-conductive coating is formed on the entire peripheral surface of.

By the way, a plurality of pin members 36 as cleaning members are formed on the outer peripheral surface of the rubber sleeve 33b of the toner carrying roller 33, as shown in FIGS. That is, the plurality of pin members 36 are spirally planted on the outer peripheral surface of the toner transport roller 33 in the circumferential direction of the roller by a small pitch (for example, about 20 ° pitch), and from the outer peripheral surface of the roller. About 30μ
It has a diameter of about 0.1 mm protruding by a minute height of m. Further, in the roller axial direction of the toner transport roller 33, one pin member 36 constitutes the aperture electrode body 4.
It is provided so as to correspond to each opening 42 of 0.

The toner case 31 has a thin plate-shaped toner layer regulation blade 3 made of an insulating material having elasticity.
4 is attached, and the curved portion thereof is the toner transport roller 3
The toner layer regulating blade 34 regulates the layer thickness of the toner 3 which is in contact with the surface of the toner conveying roller 33 in a layered manner and is adhered to the surface of the toner conveying roller 33 in a layered manner.

The upper end of the toner case 31 is substantially roof-shaped so as to cover the opening at the upper end of the toner case 31 and contact the upper end of the toner transport roller 33 from above with the layered toner 3 interposed therebetween. Aperture electrode body 40 inclined is attached to. The aperture electrode body 40 will be described. As shown in FIGS. 2 and 4, the aperture electrode body 40 includes an insulating sheet 41 made of a synthetic resin (for example, polyimide) and having a thickness of about 25 μm, and a large number of minute openings. A portion 42, an electrode array 44 including a large number of annular control electrodes 43 formed on the outer peripheral portion of the large number of openings 42 on the surface of the insulating sheet 41, and extending from the large number of control electrodes 43 in a predetermined direction. It is composed of a large number of conducting wires 45 and the like.

A large number of openings 42 are formed in a row in the horizontal direction orthogonal to the transport direction of the paper P at predetermined minute intervals at a position substantially in the center of the insulating sheet 41 in the front-rear direction. On the surface of the insulating sheet 41, an annular control electrode 43 made of a copper film and surrounding the outer circumference of each opening 42 and a conductive wire 45 made of a copper film integrally extending from the control electrode 43 are formed. . The diameter of the opening 42 is, for example, about 65 μm.
The pitch between the openings 42 is about 127 μm. For example, in the case of A4 size paper, the number of openings 42 (that is, the number of control electrodes 43) is about 1700.

On the other hand, as shown in FIG. 1, immediately above the aperture electrode body 40, there is a carrying gap (about 1) for carrying the paper P.
mm) and a back electrode roller 50 (this corresponds to a back electrode) is disposed.
Is rotatably supported by the main body frame 2 via the supporting shaft 50a, and is rotationally driven in the direction of arrow C in synchronization with the conveyance of the paper P by a roller driving mechanism (not shown). Paper P
Is conveyed in the conveying direction while being in contact with the lower end of the back electrode roller 50, and the paper P flies from the surface of the toner conveying roller 33 on the lower surface in accordance with the drive voltage applied to the control electrode 43 during the conveyance. Then, the toner 3 that has passed through the opening 42 is attached.

Next, the control system of the image forming apparatus 1 will be briefly described with reference to FIG. 3. A high voltage of about +1 KV is constantly applied to the back electrode roller 50 by the power supply circuit 61, and the back electrode roller 50 becomes negative. The charged toner 3 is attracted to the back electrode roller 50 by a large electrostatic force. On the other hand, a control unit 60 that receives an image signal from the outside, a power supply circuit 62, and an electrode drive circuit 63 are provided, and the control unit 60 uses the image signal to
It is configured to control the drive voltage applied to a large number of control electrodes 43 via the electrode drive circuit 63. Further, the toner carrying roller 33 is always grounded.

That is, a large number of conducting wires 4 of the aperture electrode body 40.
5 is connected to an electrode drive circuit 63 via a control line 64 composed of a large number of signal lines.
Two kinds of drive voltages of + 30V and -30V are supplied from the power supply circuit 62. The control unit 60 sends a control signal corresponding to the image signal for the plurality of control electrodes 42 to the electrode drive circuit 6
3 simultaneously, and the electrode drive circuit 63 applies a drive voltage of +30 V to each control electrode 43 for recording a pixel.
4 and outputs a driving voltage of −30 V to each control electrode 43 that does not record pixels via the control line 64.

Next, the image forming operation of the image forming apparatus 1 described above and the operation of the image forming apparatus 1 will be described. As shown in FIG. 4, the toner 3 charged on the negative electrode is
The toner is conveyed to the electrode array 44 while being attached to the peripheral surface of the toner conveying roller 33, and the control electrode 4 is formed at the time of pixel formation.
When +30 V is applied to the toner 3, toner 3 is transferred to the control electrode 43.
Receives an electrostatic force from an electric field from the rear electrode roller 50 toward the control electrode 43, receives an electrostatic force from an electric field from the rear electrode roller 50 toward the control electrode 43. Back electrode roller 5
It flies toward 0 and collides with and adheres to the paper P. But,
When −30V is applied to the control electrode 43 except when the pixel is formed, the toner 3 receives the electrostatic force from the electric field from the toner transport roller 33 toward the control electrode 43, and passes through the opening 42, contrary to the above. There is nothing to do. After that, the paper P
The toner image adhered to is fixed to the paper P by the fixing mechanism 20.

By the way, since a cleaning member composed of a plurality of pin members 36 is formed on the outer peripheral surface of the toner conveying roller 33 so as to correspond to the opening 42 of the aperture electrode body 40, these pin members 36 are As shown in FIG. 4, the opening 42 and its vicinity are individually and repeatedly contacted from the toner supply side, that is, the lower side, and move in the toner conveyance direction in synchronization with the rotation of the toner conveyance roller 33. The toner 3 adhering to 42 and its vicinity is reliably cleaned, and the toner 3 does not stick to these openings 42 and its vicinity.

At this time, since each pin member 36 has a spiral shape shifted by a predetermined pitch in the circumferential direction of the toner transport roller 33, the pin members 36 individually come into contact with the opening 42 and its vicinity, so that cleaning can be performed efficiently. You can
Further, the peripheral speed of the toner transfer roller 33 is set to be about 10 times the paper transfer speed, that is, when recording one pixel of toner, the toner transfer roller 33 is set to rotate at a peripheral speed of about 10 pixels. Therefore, each pin member 36 does not interfere with pixel formation.

In this way, the toner transport roller 33 is
A plurality of pin members 3 as cleaning members on the outer peripheral surface of the
6 is provided, and this cleaning member contacts the aperture electrode body 40 from the toner supply side, and while performing the image forming process, the plurality of openings 42 of the aperture electrode body 40 and their vicinity are individually repeated. Since the aperture electrode body 40 can be easily cleaned without separately providing a cleaning mechanism or an electrode body drive mechanism, the efficiency of image forming processing can be improved, and the flying property of the toner 3 can be improved, so that the image of the image can be formed. The quality can be improved.

By the way, as shown in FIG. 5, a cleaning member made of metal such as stainless steel or having abrasion resistance and having a width of about 0.1 mm protruding from the outer peripheral surface of the toner conveying roller 33A by a minute height of about 30 μm. The cleaning blade 36A as a member is attached to the toner transport roller 3
It may be spirally wound around the outer peripheral surface of 3A. In this case, the leftmost opening 42A to the rightmost opening 42A of the aperture electrode body 40A and the vicinity thereof can be uniformly cleaned, and the cleaning blade 36A can be wound and fixed by adhesion or the like. Therefore, the manufacture of the toner transport roller 33A is simplified.

Further, as shown in FIG. 6, the toner conveying roller 3 is made of metal such as stainless steel or has abrasion resistance.
It has a width of about 0.1 mm protruding from the outer peripheral surface of 3A by a minute height of about 30 μm, extends linearly in the roller axial direction of the toner transport roller 33B, and is spaced at predetermined intervals in the peripheral direction of the roller outer peripheral surface (for example, The cleaning member may be composed of a plurality of cleaning blades 36B provided at about 20 °. In this case, since the plurality of cleaning blades 36B are fixedly provided in a linear shape by adhesion or the like, the production of the toner transport roller 33B is further simplified.

A plurality of spirally formed pin members 3
6 is formed over a plurality of lines, or the cleaning blade 36A is formed over a plurality of lines, etc., within the scope of the technical idea of the present invention, existing techniques and techniques obvious to those skilled in the art. It is possible to make various changes based on the above.
Of course, the present invention can be applied to various image forming apparatuses in which the adhesion of the toner 3 to the paper P is controlled by the aperture electrode body 40.

[0035]

According to the image forming apparatus of claim 1, an aperture electrode body having a plurality of openings and an electrode array,
A toner supply mechanism for supplying toner to the electrode array,
Since the toner feeding mechanism is provided with the back electrode and the electrode control means, and the toner feeding roller is driven to rotate, and the cleaning member is provided on the outer peripheral surface of the toner feeding roller, the cleaning mechanism and the electrode body driving mechanism are separately provided. Without providing the image forming process, the plurality of openings of the aperture electrode body and the vicinity thereof can be repeatedly cleaned, the image forming process efficiency can be improved, and the toner flying property can be improved. The image quality of can be improved.

According to the image forming apparatus of claim 2, the same effect as that of claim 1 is obtained, but the cleaning member is
A plurality of pin members that are spirally provided on the outer peripheral surface of the toner transport roller by shifting a minute pitch in the roller circumferential direction and project a predetermined minute height from the roller outer circumferential surface, in the roller axial direction of the toner transport roller. Since at least one pin member is composed of a plurality of pin members provided so as to correspond to the respective openings of the aperture electrode body, each pin member is individually and repeatedly arranged in the corresponding openings and their vicinity. Since they come into contact with each other, it is possible to efficiently and surely clean the opening and the vicinity thereof.

Here, the toner transport roller is rotationally driven so that the peripheral speed due to the rotation of the toner transport roller becomes faster than the transport speed of the image recording medium, and thereby the pixels are formed by the flight of the toner passing through the opening. There is nothing to prevent.

According to the image forming apparatus of claim 3, the same effect as that of claim 2 is obtained, but the cleaning member is
Extends linearly in the roller axis direction of the toner transport roller,
Since the cleaning blades are provided at predetermined intervals in the circumferential direction of the roller outer peripheral surface and protrude from the roller outer peripheral surface by a predetermined minute height, each of the plurality of cleaning blades simultaneously forms a plurality of openings. The toner can be repeatedly cleaned, and since a plurality of cleaning blades are fixed and provided in a straight line, the toner transport roller can be easily manufactured.

According to the image forming apparatus of the fourth aspect, the same effect as that of the second aspect is obtained, but the cleaning member is
Since it is composed of a cleaning blade spirally provided on the outer peripheral surface of the toner transport roller so as to project a predetermined height from the outer peripheral surface of the toner transport roller, the opening at one end to the opening at the other end. Also, since the cleaning blade and the vicinity thereof can be sequentially and repeatedly cleaned and the cleaning blade is only wound and fixed in a spiral shape, the manufacturing of the toner conveying roller is further simplified.

[Brief description of drawings]

FIG. 1 is a partial vertical schematic side view of an image forming apparatus according to an exemplary embodiment of the present invention.

FIG. 2 is a partial perspective view of the aperture electrode body of the image forming apparatus as viewed from the control electrode side.

FIG. 3 is a front view of a toner transport roller.

FIG. 4 is an enlarged cross-sectional view of a main part of the image forming apparatus in FIG.

FIG. 5 is a view corresponding to FIG. 3 according to the first modification.

FIG. 6 is a view corresponding to FIG. 3 according to a second modification.

[Explanation of symbols]

 1 Image Forming Apparatus 3 Toner 30 Toner Supply Mechanism 33 Toner Conveying Roller 36 Pin Member 40 Aperture Electrode Body 41 Insulating Sheet 42 Opening 43 Control Electrode 44 Electrode Array 60 Control Unit 63 Electrode Drive Circuit 61 Power Supply Circuit 62 Power Supply Circuit P Paper 36A・ 36B cleaning blade

Claims (4)

[Claims] 1. An aperture electrode in which a plurality of openings arranged in a line in a direction orthogonal to a conveyance direction of an image recording medium and an electrode array formed of a plurality of control electrodes near the openings are formed on an insulating sheet. Body, a toner supply mechanism that supplies toner to the electrode array of the aperture electrode body, a back electrode that closely opposes the electrode array of the aperture electrode body across the conveyance gap of the image recording medium, and based on the image signal. And an electrode control unit for individually controlling the drive voltage applied to the plurality of control electrodes of the electrode array, wherein the toner feeding mechanism is a toner transport roller that is rotationally driven and adheres to the outer peripheral surface. A toner transport roller that supplies the toner thus set to the electrode array, and an outer peripheral surface of the toner transport roller that is in contact with the aperture electrode body from the toner supply side. An image forming apparatus comprising: the cleaning member, a cleaning the plurality of openings and vicinity thereof of the aperture electrode. 2. The cleaning member is a plurality of pin members, which are spirally provided on the outer peripheral surface of the toner transport roller by shifting a minute pitch in the roller circumferential direction and project from the roller outer peripheral surface by a predetermined minute height. The at least one pin member is constituted by a plurality of pin members provided so as to correspond to the respective openings of the aperture electrode body in the roller axis direction of the toner transport roller. Image forming apparatus. 3. The cleaning member comprises a plurality of cleaning members that extend linearly in the roller axis direction of the toner conveying roller, are provided at predetermined intervals in the circumferential direction of the roller outer peripheral surface, and project a predetermined minute height from the roller outer peripheral surface. The image forming apparatus according to claim 1, wherein the image forming apparatus comprises a blade. 4. The cleaning member is composed of a cleaning blade spirally provided on the outer peripheral surface of the toner conveying roller so as to protrude by a predetermined height from the outer peripheral surface of the toner conveying roller. The image forming apparatus according to item 1.