JP6727839B2 - Charging device, process cartridge, and image forming apparatus - Google Patents

Description

The present invention relates to a charging device that charges a surface of an image carrier such as a photoconductor, a process cartridge including the charging device, and an image forming apparatus that forms an image on a recording medium.

In recent years, as a charging device for an image forming apparatus such as an electrophotographic device or an electrostatic recording device, instead of a corona charger, a conductive charging member is directly brought into contact with the photosensitive member to uniformly charge the surface of the photosensitive member. A contact DC charging method, which suppresses the generation of ozone, is widely adopted. As an example of this method, a DC bias is applied to a charging roller that is a charging member, and uniform discharge is performed while rotating in contact with the surface of the photoconductor to uniformly charge the surface of the photoconductor.

Since this charging roller charges the printing area properly, it is necessary to keep the position in the longitudinal direction constant, and it is desirable to position it in the longitudinal direction. For example, as disclosed in Japanese Patent Application Laid-Open No. 2004-242242, a configuration is shown in which the rotation axis of the photoconductor and the rotation axis of the charging roller intersect each other at a predetermined angle (crossing angle). With such a structure, the charging roller receives the thrust force in the longitudinal direction due to the rotational driving, and can move to the predetermined position.

On the other hand, in the contact DC charging method, since the toner and the external additive are easily attached to the surface of the charging roller since they are in direct contact with the surface of the photoconductor, charging failure is likely to occur. In particular, if the charging roller has a long life or there is no cleaning member for cleaning the surface of the photoconductor, the contamination of the charging roller becomes a serious problem. Therefore, various means for cleaning the charging member have been proposed in order to prevent such contamination of the surface of the contact charging member. For example, Patent Document 2 discloses a configuration for cleaning the contact charging member with a brush.

Japanese Patent No. 4749049 JP, 2002-108069, A

In order to position the charging roller and the photosensitive member in the longitudinal direction, a crossing angle is provided between the photosensitive member and the charging roller as described above. In addition, when the charging roller is driven by a gear, a helical gear is used for the longitudinal direction. There is a method of receiving thrust force in a certain direction. This allows the charging roller and the photoconductor to move in a predetermined direction and be positioned.

However, if a brush member for cleaning the surface of the charging roller is brought into contact with the surface of the charging roller, a load is generated on the charging roller. Therefore, the charging roller cannot move smoothly in the longitudinal direction, and the longitudinal positions of the charging roller and the photoconductor are not fixed. Although the thrust force of the charging roller is increased by increasing the crossing angle, the contact in the longitudinal direction becomes unstable, which is not preferable.

Therefore, an object of the present invention is to position the charging member in the configuration in which the charging member is cleaned with the brush member.

A typical configuration of the present invention for achieving the above object is:
A charging device used in an image forming apparatus ,
A charging member rotating article is charged et image bearing member, a brush member in contact at the contact portion between the charging member,
Have
Wherein during charging member you rolling times, the force receiving portion is different location than the contact portion a force receiving portion for receiving a force applied in the longitudinal direction of the front Symbol charging member, the force which the charging member is subjected The charging member and the brush member are arranged such that the direction of the force of the longitudinal component is the same as the direction of the force of the longitudinal component received by the charging member at the contact portion .

With the above configuration, it is an object to position the charging member in the configuration in which the charging member is cleaned with the brush member.

Schematic cross-sectional view of the image forming apparatus according to the first and second embodiments. Schematic cross-sectional view of the vicinity of the charging roller in Example 1. Schematic diagram showing the configuration of the charging roller and the photosensitive drum in Example 1. Schematic diagram showing the contact state between the charging roller and the photosensitive drum in Embodiment 1. Schematic diagram showing the configuration of the charging roller and the brush member in Example 1. 2 is a schematic diagram showing the driving-side configuration of a charging roller and a photosensitive drum in Embodiment 2. FIG. Schematic diagram showing the configuration of the charging roller and the brush member in the second embodiment. Explanatory drawing of cartridge Illustration of cleanerless configuration

<Example 1>
<Outline of configuration of image forming apparatus>
Hereinafter, the image forming apparatus according to the present invention will be described in more detail with reference to the drawings. The examples described below are for exemplifying the present invention, and the dimensions, materials, shapes, relative positions, etc. of the components described below are not particularly specified unless otherwise specified. However, the scope of the present invention is not limited thereto. An image forming process will be described based on FIG. 1 with reference to a schematic sectional view of an image forming apparatus 100 according to the present embodiment of the present invention.

In the image forming apparatus of this embodiment, when a CPU (not shown) as a receiving unit of the electrophotographic image forming apparatus receives a signal of image information from a personal computer or the like (not shown), the sheet cassette 51 attached to the lower portion of the apparatus. The sheet S is transported by the transport rollers 52. In synchronization with this sheet conveyance, the photosensitive drum 1 which is an image carrier starts to rotate.

The photoconductor drum 1 in this embodiment is a negative polarity OPC photoconductor of φ24 mm. The photosensitive drum 1 is rotationally driven in the direction of arrow A at a constant peripheral speed of 100 mm/sec (=process speed PS, printing speed).

There is a charging roller 2 as a charging member, which charges the surface of the photosensitive drum 1. As shown in FIG. 2, the charging roller 2 is a conductive elastic roller, and includes a core metal 2a and a conductive elastic layer 2b. The charging roller 2 is pressed against the photosensitive drum 1 with a predetermined pressing force to form a charging area between the charging roller 2 and the photosensitive drum 1. In this example, the charging roller 2 is driven to rotate in the direction of arrow B with respect to the rotation of the photosensitive drum 1. There is a charging power source (not shown) that applies a charging bias to the charging roller 2, and in this example, a DC voltage is applied from this charging power source to the core metal 2a. The DC voltage to be applied is set to a value such that the potential difference between the surface of the photosensitive drum 1 and the charging roller 2 is equal to or higher than the discharge start voltage. Specifically, a DC voltage of -1300 V is applied as a charging bias. There is. At this time, the surface of the photosensitive drum 1 is uniformly contact-charged to a charging potential (dark portion potential) of -700V. Further, in order to clean the surface layer of the charging roller 2, a brush member 10 arranged so as to contact the charging roller 2 is provided. The charging roller 2 and the brush member 10 will be described later.

As an exposure means (exposure device), there is a laser beam scanner 3 including a laser diode, a polygon mirror and the like. The laser beam scanner 3 outputs a laser beam whose intensity is modulated corresponding to a time series electric digital pixel signal of the target image information, and scans and exposes the uniformly charged surface of the rotating photosensitive drum 1 with the laser beam. .. The laser power is adjusted so that the potential of the surface of the photosensitive drum 1 becomes −150 V when the uniformly charged surface of the photosensitive drum 1 is entirely exposed with laser light. The laser beam scanner 3 exposes the photoconductor drum 1 to form an electrostatic latent image (electrostatic image) on the photoconductor drum 1.

In this embodiment, the developing device (developing device) 4 uses a negative magnetic one-component toner as a developer. A developing sleeve 13 and a developing blade 14 which are toner carrying members are arranged. The developing sleeve 13 is rotationally driven in the direction of arrow C. The magnetic toner is attracted to the developing sleeve 13 by the magnetic force of a magnet (not shown) which is a magnetic field generating means included in the developing sleeve 13. The toner t is regulated by the developing blade 14 to have a predetermined layer thickness and has a constant negative triboelectric charge. After that, the electrostatic latent image on the photosensitive drum 1 is visualized in the developing portion a by the developing bias applied between the developing sleeve 13 and the photosensitive drum 1 by the developing bias applying power source (not shown). The developing bias is set to -350V. That is, the latent image on the photosensitive drum is developed by the developing sleeve 13, so that a toner image (developer image) is formed on the photosensitive drum 1.

The photoconductor drum 1 is an image carrier that carries an image (toner image, latent image). The developing device 4 supplies a developer to the image carrier to develop the latent image. The developing sleeve 13 provided in the developing device 4 is a developer carrier that carries a developer and develops a latent image.

There is a transfer roller 5 of medium resistance as the contact transfer manual throwing, and the transfer nip portion b is formed by pressing the transfer roller 5 to the photosensitive drum 1 at a predetermined pressure. The transfer roller 5 used in this example has a roller resistance value of 5×10 8 Ω in which a medium resistance foam layer is formed on a core metal, and a voltage of +2.0 kV was applied to the core metal for transfer. That is, the toner image is transferred from the photosensitive drum 1 to the transfer target material by the transfer roller 5 (transfer device, transfer member). In this embodiment, the transfer device (transfer roller 5) transfers the toner image directly from the photosensitive drum 1 to the recording medium (sheet). However, the toner image may be transferred from the photosensitive drum 1 to the intermediate transfer member, and the toner image may be indirectly transferred from the intermediate transfer member to the recording medium (sheet). At this time, the intermediate transfer member is the transfer target material to which the toner image is transferred from the photosensitive drum 1.

The cleaning device 6 removes the transfer residual toner slightly remaining on the surface of the photosensitive drum 1 after the transfer process. The cleaning device 6 includes a cleaning blade 6a having an elastic member such as urethane rubber at the tip of a supporting member made of sheet metal or the like. The transfer residual toner is removed from the surface of the photosensitive drum 1 by bringing the tip of the elastic member (cleaning blade 6a) into contact with the surface of the photosensitive drum 1 with a predetermined pressing force in the so-called counter direction.

As a fixing unit, there is a heat fixing type fixing device 7, and the sheet S which has passed the transfer portion and has received the transfer of the toner image is separated from the surface of the rotary photosensitive drum 1 and is introduced into the fixing device 7. After the sheet S and the toner image are fixed, the sheet S is ejected to the paper ejection unit 8 as an image formed product (print copy).

In this embodiment, the process cartridge P (see FIG. 8) is attachable to and detachable from (attachable to) the main body of the image forming apparatus 100. The photosensitive drum 1, the charging roller 2, the developing device 4 and the like are detachable from the apparatus main body as a part of the cartridge P. The apparatus main body is a portion of the image forming apparatus 100 excluding the cartridge P.

<Positional relationship between the photoconductor drum, the charging roller, and the brush member>
Here, the photosensitive drum 1, the charging roller 2, and the brush member 10 will be described in detail with reference to FIGS. 2 is a schematic cross-sectional view near the charging roller, and FIG. 3 is a schematic view in the longitudinal direction near the charging roller.

In the following description, the configuration including the photoconductor drum 1, the charging roller 2, and the brush member 10 may be particularly referred to as a charging device.

The photoconductor drum 1 receives a driving force from a driving unit (not shown) from the image forming apparatus, and is rotationally driven in the direction of arrow A about the rotation axis q. The photoconductor drum 1 has an organic photoconductor layer 1b coated on the outer peripheral surface of a cylinder 1a made of aluminum or the like, and a coupling member 28 as a drive transmission means is provided at one longitudinal end of the cylinder 1a. On the other hand, it is grounded via the image forming apparatus. In this embodiment, with respect to the longitudinal direction of the photosensitive drum 1 and the charging roller 2, the side on which the coupling member 28 is provided is called the driving side, and the side opposite to the driving side is called the non-driving side. The photosensitive drum 1 is configured to be driven by the driving side provided with the coupling member 28.

As described above, the charging roller 2 is composed of the core metal 2a and the conductive elastic layer 2b around the core metal 2a, and is formed into a roller shape having an outer diameter of 10 mm and a longitudinal length of 230 mm. As the core metal 2a, a SUS rod having a diameter of 6 mm plated with nickel is used.

Both ends of the core metal 2a are rotatably supported by bearings 26 and 27, respectively. The bearings 26 and 27 are biased to the photoconductor drum 1 with a predetermined pressing force S (3 to 9 N) by the pressure spring 25, and the charging roller 2 abuts the photoconductor drum 1 by this spring pressurizing force. The drum 1 is driven to rotate as the drum 1 is rotated.

The bearings 26 and 27 are formed of a member having good slidability such as POM. In the present embodiment, the bearing 26 on the non-driving side serves as a feeding path for the charging bias from the charging power source 91 to the charging roller 2, so that the conductive filler such as carbon is uniformly dispersed and the resistance thereof is 101 to 103Ω. m.

In the present embodiment, the charging roller 2 is positioned on the power feeding path side so that the charging roller 2 can be reliably fed with power, and the charging roller 2 is moved to the non-driving side. Therefore, the bearing 26 has a core receiving surface for receiving the core 2a of the charging roller 2.

FIG. 4 is a schematic view showing a contact state between the photosensitive drum 1 and the charging roller 2. As shown in FIG. 4, in the embodiment, the charging roller 2 is arranged so that the rotation axis q of the photosensitive drum 1 and the rotation axis p of the charging roller 2 are in contact with each other at a predetermined intersection angle θ. Has been done. As to the direction of the inclination, when viewed from above the charging roller 2, the charging roller 2 is such that the longitudinal driving side is located upstream of the non-driving side of the charging roller 2 in the rotational direction of the photosensitive drum 1. It is arranged.

When the photosensitive drum 1 starts driving and rotating in the arrow direction A, the charging roller 2 is driven to rotate in the arrow direction B. Due to the crossing angle θ, the charging roller 2 has a predetermined thrust force R in the direction of arrow R (axial direction (longitudinal direction)) along the rotational axis p direction (longitudinal direction) (predetermined force acting on the charging roller 2 in the longitudinal direction). It acts to move))).

That is, since the photosensitive drum 1 is inclined with respect to the charging roller 2, when the photosensitive drum 1 and the charging roller 2 rotate, a frictional force generated between the charging roller 2 and the photosensitive drum 1 is applied to the charging roller. It will act in the longitudinal direction. That is, the charging roller 2 receives the thrust force R from the contact portion (force receiving portion) that comes into contact with the photosensitive drum 1.

Further, the photosensitive drum 1 receives the thrust force T in the arrow T direction along the rotation axis q. In this embodiment, the rotation axis q of the photosensitive drum 1 and the rotation axis p of the charging roller 2 are inserted in the vicinity of the central portion of the charging roller 2 in the longitudinal direction, and the absolute value of the intersection angle θ is 0.3±0. It is set to 1°.

<Brushing of the brush member 10>
The relationship and effect between the charging roller 2 and the brush member 10 will be described in detail with reference to FIG. The brush member 10 is arranged on the frame body 40 (see FIGS. 2, 3 and 6) so as to contact the surface of the charging roller 2. The brush member 10 includes an elastic layer 31, a support 32, and brush bristles 33. The brush bristles 33 have a length of 2 mm and a thickness of 30 μm and are electrically conductive. The brush bristles 33 are made of a resin such as nylon or rayon, and are sewn on the support 32 at a density of about 30,000 fibers/cm 2. By supporting the brush portion with the elastic layer 31, it is possible to make stable contact with the charging roller 2, and it is possible to prevent the brush bristles 33 from being deformed by the contact pressure with the charging roller 2. It is desirable that the brush bristles 33 have the same potential as that of the charging roller 2. Therefore, the resistance of the support 32 and the brush bristles 33 is preferably about 102 to 108 Ω·m. In the present embodiment, the brush bristles 33 are subjected to a slanting treatment so that the bristles collapse on the non-driving side in the longitudinal direction. In this embodiment, the bristle collapse angle is about 30° from the root toward the tip. That is, the brush bristles are inclined about 30° with respect to the plane orthogonal to the rotation axis p of the charging roller 2.

The slanting treatment is generally performed by, for example, a method of giving a habit of falling over the brush bristles 33, or preliminarily obliquely planting the brush bristles 33 on the support 32. Target.

With the configuration described above, the surface of the charging roller 2 is cleaned by the brush bristles 33 of the brush member 10. Further, the brush bristles 33 are subjected to a slant treatment on the non-driving side in the longitudinal direction. Therefore, when the charging roller 2 starts to rotate in a state of being in contact with the brush member 10, the thrust force S in the direction of the arrow S (acts in the longitudinal direction of the charging roller 2 at the abutting portion (the charging roller 2 is moved in the longitudinal direction). It receives a second force) that acts to move it.

Here, the thrust force S and the above-mentioned thrust force R (the force that the charging roller 2 receives from the photosensitive drum 1) act in the same direction in the longitudinal direction. That is, the charging roller 2 receives a component in the longitudinal direction (thrust force S) of the force received from the brush member 10 at the contact portion with the brush member 10 and a contact portion (force receiving portion) in contact with the photosensitive drum 1 at the photosensitive member. The longitudinal component of the force received from the drum 1 (thrust force R) is in the same direction.

That is, the charging roller 2 receives two different forces at two different places, that is, a contact portion (force receiving portion) with the photosensitive drum 1 and a contact portion with the brush member 10. Since these two forces, that is, the thrust force R and the thrust force S, act in the same direction (the same direction) in the longitudinal direction, the charging roller 2 smoothly moves to the non-driving side, which is the direction in which the force is applied.

Therefore, the charging roller 2 can be reliably positioned at a desired position in the charging device.

Note that the setting of the brush bristles 33 is shown in this embodiment as an example, and it is sufficient that the surface of the charging roller 2 can be cleaned and a predetermined thrust force is applied to the charging roller.

<Example 2>
The second embodiment according to the present invention will be described below. The second embodiment is different from the first embodiment in that the charging roller 2 has a driving structure and there is no cleaning device 6.

<Cleanerless system>
Next, the cleanerless system in this embodiment will be described in detail with reference to FIG. The transfer residual toner remaining on the photoconductor drum 1 after the transfer process is negatively charged like the photoconductor drum 1 by the discharge generated between the charging roller 2 and the photoconductor drum 1. At this time, the surface of the photosensitive drum 1 is charged to -700V. The transfer residual toner negatively charged passes through the charging roller 2 without being attached to the charging roller 2 due to the potential difference (surface potential of the photosensitive drum 1=−700 V, charging roller potential=−1300 V) at the charging portion.

The transfer residual toner that has passed through the charging section reaches the laser irradiation position on the surface of the photosensitive drum 1 where the laser beam is irradiated from the laser beam scanner 3. Since the transfer residual toner is not so large as to block the laser beam of the laser beam scanner 3, it does not affect the process of forming an electrostatic image (latent image) on the photosensitive drum 1. Of the toner that has passed through the laser irradiation position, the toner in the non-exposed portion (the surface of the photoconductor drum 1 that has not been irradiated by the laser) is collected by the developing sleeve 13 by the electrostatic force in the developing portion. Then, such toner is further collected by the developing device 4 via the developing sleeve 13.

On the other hand, of the toner that has passed through the laser irradiation position, the toner of the exposed portion (the surface of the photosensitive drum 1 that has been irradiated with the laser) remains on the photosensitive drum 1 without being electrostatically collected. However, some toner may be collected by a physical force due to the peripheral speed difference between the developing sleeve 13 and the photosensitive drum 1. Such toner is also collected by the developing device 4 via the developing sleeve 13.

The toner remaining on the photosensitive drum 1 without being transferred is generally collected by the developing device 4 except for the toner in the exposed portion. Then, the toner collected in the developing device 4 is mixed with the toner contained in the developing device 4 and used again.

That is, the developing device 4 simultaneously develops the latent image and collects the toner remaining on the photosensitive drum 1.

In the case of the cleanerless configuration, since the cleaning blade 6a is not provided, the torque of the photoconductor drum 1 is reduced, and the longitudinal brake is not provided, so that the photoconductor drum 1 is easily displaced in the longitudinal direction.

FIG. 6 is a schematic diagram of the configuration on the driving side of the charging roller and the photosensitive drum. In this embodiment, the charging roller 2 is driven by a core metal 2a through a charging roller drive gear 29 with a peripheral speed difference of 110% with respect to the photosensitive drum 1. The charging roller driving gear 29 is configured to receive a driving force by being engaged with a gear portion formed on the coupling member 28 provided on the photosensitive drum 1.

By driving the charging roller 2 with a peripheral speed difference with respect to the photoconductor drum 1, it is possible to rub the adhering material attached to the charging roller 2 at the contact portion with the photoconductor drum 1 to make it negative. it can. As a result, due to the potential difference between the charging roller 2 and the photoconductor drum 1, the adhering substances can be returned to the photoconductor drum 1, and dirt on the surface of the charging roller 2 can be reduced.

The charging roller drive gear 29 is composed of a member such as POM, and is configured to receive a driving force by engaging with a gear portion of the coupling member 28 provided on the driving side of the photosensitive drum 1. .. Further, the gear portion provided on the charging roller drive gear 29 and the coupling member 28 has a helical tooth shape. This makes it possible to increase the substantial meshing ratio and suppress the occurrence of uneven rotation of the charging roller 2.

In this embodiment, the charging roller driving gear 29 (first helical gear) and the gear portion (second helical gear) of the coupling member 28 are shaped such that the charging roller 2 and the photosensitive drum 1 are in the longitudinal direction. The thrust force is applied to the drive side of. That is, the inclination of the teeth of each gear is as shown in FIG.

Positioning the charging roller 2 and the photosensitive drum 1 on the driving side leads to a proper meshing width between the charging roller driving gear 29 and the drum coupling member 28, and as a result, uneven rotation can be suppressed. Becomes Further, sliding members 42 and 43 having good slidability are provided as positioning portions for the charging roller drive gear 29 and the coupling member 28, respectively. As this sliding member, a POM, a POM containing a sliding agent, a polycarbonate, a polycarbonate containing a sliding agent, or a resin such as nylon is joined to the frame 40 by press fitting, bonding, screwing or the like.

The relationship between the charging roller 2 and the brush member 10 and the effect thereof will be described in detail with reference to FIG. In this embodiment, the brush bristles 33 of the brush member 10 are subjected to the bristling process on the drive side of the charging roller 2. As a result, when the charging roller 2 starts driving while being in contact with the photosensitive drum 1, the brush member 10 receives the thrust force S as in the first embodiment.

Further, when the charging roller 2 receives the rotational driving force in the arrow B direction through the charging roller driving gear 29, the thrust force U is generated. That is, the charging roller 2 receives a predetermined force (thrust force U) in the longitudinal direction of the charging roller from the photosensitive drum 1 (coupling member 28) in the charging roller drive gear 29 (a helical gear, a force receiving portion). .. That is, the thrust force U is a force that acts to move the charging roller 2 in the longitudinal direction.

Also in this embodiment, the charging roller 2 receives forces (thrust force U, thrust force S) at different places, that is, at the charging roller drive gear 29 (force receiving portion) and the contact portion of the brush member 10, respectively. However, the thrust force U and the thrust force S act in the same direction in the longitudinal direction. That is, the longitudinal component of the force that the charging roller drive gear 29 receives (thrust force U) and the longitudinal component of the force that the contact portion of the brush member 10 receives (thrust force S) are in the same direction. As a result, the charging roller 2 smoothly moves to the drive side in the longitudinal direction, so that the charging roller 2 can be reliably moved to a desired position.

As a comparative example, when the bristles of the brush bristles 33 are in the opposite direction, the thrust force U and the thrust force S applied to the charging roller 2 are in opposite directions, so that the longitudinal positioning of the charging roller 2 is not smoothly performed. As a result, uneven rotation between the charging roller driving gear 29 and the coupling member 28 due to the improper meshing ratio and the phenomenon that the charging roller driving gear 29 is disengaged from the core metal 2a occur. At that time, poor charging occurred.

On the other hand, in the configuration of the present embodiment, as described above, the direction of the thrust force received by the charging roller 2 by the charging roller drive gear 29 and the thrust force received by the charging roller from the brush bristles 33 act in the same direction. By doing so, the charging roller 2 can be smoothly moved to a predetermined position (driving side). The photosensitive drum 1 is also positioned on the drive side where the charging roller 2 is moved by the thrust force V. That is, the longitudinal component (thrust force V) of the force received by the gear portion (second helical gear) of the coupling member 28 has the same direction as the thrust force U and the thrust force S. As a result, by setting the longitudinal positions on the same side of the charging roller 2 and the photosensitive drum 1, the meshing ratio is increased, and the occurrence of uneven rotation can be suppressed.

Although the cleanerless structure is used in this embodiment, the structure of this embodiment is not limited to this, and the structure of this embodiment can be adopted to align the thrust force S and the thrust force U. Further, in this embodiment, no crossing angle is provided between the charging roller 2 and the photosensitive drum 1, but it is possible to apply a thrust force in the longitudinal direction to the charging roller 2 and the photosensitive drum 1 as described in the first embodiment. Therefore, further effects can be obtained.

DESCRIPTION OF SYMBOLS 1 Photoconductor drum 2 Charging roller 4 Developing device 5 Transfer roller 10 Brush member 26, 27 Bearing 28 Coupling member 29 Charging roller drive gear 31 Elastic layer 32 Support 33 Brush bristles 100 Image forming apparatus

Claims (16)

A charging device used in an image forming apparatus,
A charging member that charges the image carrier while rotating,
A brush member contacting the charging member at a contact portion,
Have
A force receiving portion that receives a force applied in the longitudinal direction of the charging member while the charging member rotates, the force receiving portion being at a different location from the contact portion, and the longitudinal direction of the force received by the charging member. The charging device and the brush member are arranged such that the direction of the force of the component is the same as the direction of the force of the longitudinal component received by the charging member at the contact portion. 2. The charging according to claim 1, wherein the brush member is subjected to bevel treatment, and the force of the longitudinal component received by the charging member at the contact portion is generated when the brush member collapses. apparatus. A charging device used in an image forming apparatus,
A charging member that charges the image carrier while rotating,
A brush member contacting the charging member at a contact portion,
Have
During the rotation of the charging member, in the force receiving portion that receives a force applied in the longitudinal direction of the charging member, which is different from the contact portion, the longitudinal component of the force received by the charging member. The charging device and the brush member are arranged so that the direction of the force is the same as the direction in which the brush member comes into contact with the charging member at the contact portion. 2. The force receiving portion is an abutting portion for abutting the charging member and the image carrier in a state where a rotation axis of the image carrier and a rotation axis of the charging member intersect with each other. 4. The charging device according to any one of 3 to 3. A first helical gear that engages with the charging member,
The charging device according to any one of claims 1 to 4, wherein the force receiving portion is a first helical gear. A process cartridge attachable to an image forming apparatus,
An image carrier,
A charging member that charges the image carrier while rotating,
A brush member contacting the charging member at a contact portion,
Have
While the charging member is rotating, a force receiving portion that receives a force applied in the longitudinal direction of the charging member, which is a different location from the contact portion, of the longitudinal component of the force that the charging member receives The process cartridge, wherein the charging member and the brush member are arranged so that the direction of force is the same as the direction of force of the longitudinal component received by the charging member at the contact portion. The process according to claim 6, wherein the brush member is subjected to bevel treatment, and the force of the longitudinal component received by the charging member at the contact portion is generated when the brush member collapses. cartridge. A process cartridge attachable to an image forming apparatus,
An image carrier,
A charging member that charges the image carrier while rotating,
A brush member contacting the charging member at a contact portion,
Have
While the charging member is rotating, a force receiving portion that receives a force applied in the longitudinal direction of the charging member, which is a different location from the contact portion, of the longitudinal component of the force that the charging member receives The process cartridge, wherein the charging member and the brush member are arranged such that the direction of the force is the same as the direction in which the brush member comes into contact with the charging member at the contact portion. 7. The force receiving portion is an abutting portion that abuts the charging member and the image carrier in a state where a rotation axis of the image carrier and a rotation axis of the charging member intersect with each other. 9. The process cartridge according to any one of items 8 to 8. An image carrier,
A charging member that charges the image carrier while rotating,
A brush member contacting the charging member at a contact portion,
Have
While the charging member is rotating, a force receiving portion that receives a force applied in the longitudinal direction of the charging member, which is a different location from the contact portion, of the longitudinal component of the force that the charging member receives The image forming apparatus, wherein the charging member and the brush member are arranged such that the direction of force is the same as the direction of force of the longitudinal component received by the charging member at the contact portion. The image according to claim 10, wherein the brush member is subjected to bevel treatment, and the force of the longitudinal component received by the charging member at the contact portion is generated when the brush member collapses. Forming equipment. An image carrier,
A charging member that charges the image carrier while rotating,
A brush member contacting the charging member at a contact portion,
Have
While the charging member is rotating, a force receiving portion that receives a force applied in the longitudinal direction of the charging member, which is a different location from the contact portion, of the longitudinal component of the force that the charging member receives The image forming apparatus, wherein the charging member and the brush member are arranged such that the direction of the force is the same as the direction in which the brush member comes into contact with the charging member at the contact portion. 11. The force receiving portion is an abutting portion for abutting the charging member and the image carrier in a state where the rotation axis of the image carrier and the rotation axis of the charging member intersect with each other. 13. The image forming apparatus according to any one of items 1 to 12. 13. The image forming apparatus according to claim 10, further comprising a developing device that supplies a developer to the image carrier to form a developer image on the image carrier. The image forming apparatus according to claim 14, wherein the developing device collects the developer that is not used for image formation and remains on the image carrier. The image forming apparatus according to claim 14, wherein the developer is a one-component developer.

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