JPH04353877A - Image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to image forming apparatuses such as electrophotographic copying machines, laser beam printers, electrostatic recording devices, etc., and is particularly suitable for application to small process cartridge type copying machines. The present invention relates to a charging device that performs charging processing (including charge removal processing) on an image bearing member such as a photoreceptor or a dielectric material.

0002

2. Description of the Related Art In general, in image forming apparatuses, corona discharge devices are widely used as means for charging objects to be charged such as image carriers and other transfer materials.

A corona discharge device is effective as a means for uniformly charging the surface of an object to be charged such as an image carrier to a predetermined potential, but it requires a high voltage power source (DC 5 to 8 KV), and when corona is generated, ozone is relatively discharged. It occurs frequently and has problems such as low power efficiency.

[0004] Therefore, contact type charging devices are attracting attention. In particular, a direct charging method or device in which a charging member to which a bias voltage is applied is brought into contact with a charged object and moved relative to the charged object to directly transfer (inject) charge to the surface of the charged object to charge it to a predetermined potential. The applied voltage required to obtain the desired potential on the surface of the charged object can be lowered, and the amount of ozone generated during the charging process is extremely small, eliminating the need for an ozone removal filter. The configuration of the exhaust system etc. is simplified and maintenance-free.
It has advantages such as simple configuration, and many research and development proposals have been made for its practical application.

FIG. 11 is a schematic diagram of an example of a transfer type electrophotographic image forming apparatus using a contact type charging device as a charging means for an image carrier. Reference numeral 1 denotes a rotating drum-type electrophotographic photosensitive member (hereinafter referred to as a photosensitive drum) as an image carrier, which is rotated clockwise with respect to an arrow m at a predetermined circumferential speed (process speed). 2
A charging roller serves as a direct charging member, contacts the surface of the photosensitive drum 1 with a predetermined pressing force, and rotates as the photosensitive drum 1 rotates. Reference numeral 2a denotes a power source that applies a predetermined bias voltage to the charging roller 2, and the surface of the rotating photosensitive drum 1 is uniformly charged to a predetermined potential by the charging roller 2.

Next, an image information exposing means (not shown) is applied to the uniformly charged surface of the photosensitive drum 1 in an exposing section.
By performing optical image exposure L by laser beam scanning exposure, optical image projection slit exposure, etc.), an electrostatic latent image of target image information is formed. The latent image is then developed with toner in the developing device 5, and the developed image is applied to the transfer material P introduced from a paper feed section (not shown) to the transfer section between the photosensitive drum 1 and the transfer roller 6 at an appropriate timing. It is then transcribed. The transfer material P that has passed through the transfer section is separated from the surface of the photosensitive drum 1 by a transfer roller 6 to which a predetermined transfer bias voltage 6a is applied, and is conveyed to an image fixing section (not shown). After the image has been transferred, the surface of the photosensitive drum is cleaned by a cleaning device 7 to remove adhered contaminants such as residual toner, and is used repeatedly for image formation.

The cleaning device 7 of this example is of a blade cleaning type, in which the tip edge of a cleaning blade 9 fixed to a case 10 is brought into contact with a predetermined pressing force in the counter direction in the surface movement direction of the photosensitive drum 1. The contact edge portion of the blade 9 wipes off the transfer residual toner and the like on the surface of the photosensitive drum 1, thereby making the surface of the photosensitive drum 1 clean. The cleaning blade 9 is coated with polyvinylidene fluoride (PVDF) as a fixed lubricant at the time of manufacture to prevent so-called blade curling during initial use of the device.

Note that the image forming apparatus of this example has a photosensitive drum 1
, charging roller 2, developing device 5, and cleaning device 7.
The two process devices are collectively configured as a process cartridge K that is removably attachable to the main body of the image forming apparatus, thereby simplifying the maintenance of the apparatus.

[0009]

By the way, in the cleaning device 7 consisting of the cleaning blade 9 described above, in order to properly clean the photosensitive drum 1 with the cleaning blade 9, it is necessary to keep the edge of the cleaning blade 9 straight. Extremely strict precision is required regarding the position of the edge portion with respect to the photosensitive drum 1, the contact angle of the cleaning blade 9 with respect to the photosensitive drum, etc. In particular, in the process cartridge type, both ends of the support shaft of the photosensitive drum 1 are supported by the cartridge container.
In addition, since the cleaning blade 9 is assembled to the cleaning case 10 that is integrally formed with the cartridge container via a holding member, it is extremely difficult to accurately position the blade 9 and its edge portion with respect to the photosensitive drum 1. It is.

[0010] Also, dirt and dust in the air and on the transfer material,
In particular, polyvinylidene fluoride (PVDF), which is a solid lubricant applied to the cleaning blade 9 during manufacturing, peels off from the cleaning blade 9 due to vibrations and impacts during transportation of the device, vibrations caused by the rotation of the photosensitive drum 1, etc. It adheres to the surface of the charging roller 2 as it rotates. Since polyvinylidene fluoride is an insulator, when polyvinylidene fluoride gets between the photosensitive drum and the charging roller 2 as it rotates, charging failure occurs only in that area, and the charging roller 2 is charged at the same interval as the period of the charging roller 2. Image defects such as black spots or white spots occur. Furthermore, foreign matter adhering to the surface of the charging roller 2 damages the surface of the photosensitive drum 1 over time, causing streak-like image defects.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image forming apparatus that solves the above-mentioned problems by configuring the charging rotary member to also serve as a cleaning means.

0012

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances.
), a charging rotating body (2) that contacts the surface of the image carrier to charge the image carrier, a latent image forming section (3) that forms an electrostatic latent image on the image carrier, The present invention relates to an image forming apparatus including a developing device (5) that causes toner to adhere to an electrostatic latent image and a waste toner container (7a).

[0013]The first invention of the present application, for example, as shown with reference to FIGS. The body (2) constitutes a cleaning means (7) for removing toner from the image carrier (1) and storing it in the waste toner storage container (7a), and the charging rotating body (2) comprises: When charged, the image carrier (1) rotates in a forward direction relative to the image carrier (1), and at least when uncharged, the image carrier (1) rotates in the forward direction relative to the image carrier (1).
) for transmitting rotation in the opposite direction to the drive means (11,
11') and rotate in opposite directions.

Further, in the second invention of the present application, for example, referring to FIGS. 7 to 10, the toner (t) contains a magnetic material, and the charging rotating body (2) is configured to
The charging rotor (2) is disposed facing the waste toner storage container (7a), and the charging rotor (2) is provided with a magnetic absorption force capable of magnetically attaching the toner on its surface. )but,
The present invention is characterized in that it comprises a cleaning means (7) for removing toner (t) from the image carrier (1) and storing it in the waste toner storage container.

[0015] Also, preferably, the charging rotating body (2
) for scraping off toner adhering to the surface of the rotating body.

[0016] Furthermore, the image bearing member (1), the charging rotating body (2), the developing device (5), and the waste toner storage container (7a) are provided in a detachable manner with respect to the main body of the image forming apparatus. It is arranged in the cartridge (K).

[0017]

[Operation] Based on the above configuration, when the charging rotary member (2) to which a predetermined bias voltage is applied comes into contact with the image carrier (1), the surface of the image carrier is uniformly charged with a predetermined charge; Furthermore, the image carrier (
1) An electrostatic latent image is formed on the toner (
t) forms a toner image.

The toner image is transferred to the transfer material (P) by the transfer section (6), and the toner remaining on the image carrier (1) is removed by contact with the charging rotary member (2). , is stored in the waste toner storage container (7a).

At this time, in the first invention of the present application, when the charging rotor (2) is in a charged state with a predetermined bias voltage applied, the charging rotor (2) is connected to the image carrier (1). The charging rotating body (2) is rotating in the forward direction (a) with respect to
The residual toner adhering to the image carrier (1) is scraped off by the contact with the image carrier (1), and a part of it is further transferred and adhered to the charging rotary member (2) and scraped off by a scraper (13) or the like. Furthermore, at this time, due to forward rotation, residual toner may accumulate in the nip between the charging rotor (2) and the image carrier (1), but when the charging rotor (2) is not charged, the charging rotor (2) The rotation in the opposing direction (b) is transmitted by the driving means (11, 11'), and the residual toner pool described above falls into the waste toner storage container (7a).

[0020] Furthermore, in the second invention of the present application, the magnetic toner (t) is attached to the magnet (2 m) of the charging rotor (2).
The toner particles are attracted to the rotating body and scraped into the waste toner container 10 by a scraper (13) or the like that is in contact with the charging rotating body (2).

[0021]

[Effects of the Invention] As explained above, according to the present invention,
Since the charging rotor (2) has a cleaning function in addition to the charging function, it is possible to eliminate the cleaning blade that was previously required, and this makes it easier to assemble the cleaning blade, which requires high precision. This eliminates the need to assemble an image forming apparatus, especially an image forming apparatus equipped with a process cartridge (K), and prevents cleaning failures due to poor assembly accuracy.
It is possible to prevent image formation defects due to charging failure caused by F) and image defects due to foreign matter adhering to the charging rotary member (2).

Furthermore, during charging, since the charging rotor (2) and the image carrier (1) rotate in the forward direction, accurate and reliable charging can be performed, and they do not come into contact with each other. However, a large frictional force does not act on the image carrier (1) and the charging rotating body (1), and early wear of the image carrier (1) and the charging rotor (1) can be prevented, and large transmission loads and load fluctuations act on the image carrier. This makes it possible to prevent defective image formation due to rotational unevenness.Furthermore, when the charging rotary member (1) is not charged, the charging rotary member (1) is moved to face the image carrier (1) by the driving means (11, 11'). Since it rotates in the direction (b), the image carrier (1)
The residual toner accumulated in the nip portion of the charging rotor (2) is discharged by the rotation of the charging rotor (2) in the opposite direction, and the toner is fused to the image carrier (1) by the pressure of the charging rotor (2). It is possible to reliably prevent this from occurring, and also to prevent charging failures from occurring.

[0023] Furthermore, a magnet (2) is attached to the charging rotating body (2).
m) is provided, and when the magnetic toner is magnetically attached with the magnet,
The toner on the image carrier (1) is reliably transferred and attached to the charging rotary member (2), and the residual toner on the image carrier (1) can be reliably removed with an extremely simple configuration. .

Note that the above-mentioned symbols in parentheses are used to contrast with the drawings, but do not limit the structure in any way.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the copying machine 20 has a process cartridge K that is removably attached to the main body 21 of the apparatus. In addition, the device main body 21 includes a case 22
It has a paper feed tray 23 provided on one side and a paper discharge tray 25 provided on the other side, and a linear paper feed path 26 is formed by connecting these two trays. The path 26
A paper feed roller 27, a registration roller 29, a transfer roller 6, a transfer paper guide 30, a fixing roller 31, a paper ejection roller 32, and the like are provided. Further, a document table 33 movable in the direction of the arrow is disposed at the top of the apparatus body 21, and an illumination lamp 35 that illuminates the document on the document table and a light reflected from the document are directed to the photosensitive drum 1. A short focus optical element array 3 is provided which becomes a latent image forming section upon exposure.

On the other hand, as shown in detail in FIG. 1, the process cartridge K has a cartridge case 10, in which a photosensitive drum 1 constituting an image carrier is rotatably supported. . Further, around the photosensitive drum 1, a charging roller 2 constituting a charging rotating body, a hole 10a through which light L from the array 3 passes, a developing device 5, and a cleaning device 7 are arranged. The developing device 5 and the cleaning device 7 each have a developing toner storage container 5a and a waste toner storage container 7a, each of which is constructed of a case integrally formed with the case 10, and the developing device 5 is synchronized with the photosensitive drum 1. It has a developing cylinder 5b that rotates. Further, the transfer roller 6 is arranged below the photosensitive drum 1, and a transfer voltage 6a is applied to the roller.

The charging roller 2 is supported by the case 10 so as to be in contact with the photosensitive drum 1, and is also arranged so as to face into the waste toner storage container 7a. It is in contact with a predetermined bias power source 2a that negatively charges the photosensitive drum via a switch 2b. The switch 2b is turned on and off by a signal from the charging control means 16, and the charging control means 16 receives a signal from the control section of the device main body 21, and
The switch 2b is turned on in the image forming area, and the non-image forming area including the non-image forming area is turned on during the rotation of the photosensitive drum 1, such as when the photosensitive drum 1 starts rotating and during the feeding interval between the transfer paper and the transfer paper. Turn off when forming an image. Although the switch 2b is shown for ease of understanding, it is needless to say that the switch is not limited to the changeover switch, and other charging switching means such as one that directly controls the voltage of the power source 2a may be used. Further, the charging roller 2 is in contact with the tip of a scraper 13 disposed in the waste toner container 7a, and a waste toner receiving sheet 36 is fixed to the lower tip of the waste toner container 7a. The upwardly facing end of the sheet is in sliding contact with the photosensitive drum 1 to prevent waste toner from scattering (see FIG. 4).

On the other hand, as shown in FIG. 3, a flange gear 1g is integrally connected to the photosensitive drum 1, and a flange gear 2g is also integrally connected to the charging roller 2. A drive unit 11 constituting a drive means is arranged so as to face these gears. The drive unit 11 has a base 39 that is slidably supported by a guide bar 37, and a forward transmission system gear consisting of two mutually meshing gears 40 and 41 is mounted on the base. An opposing transmission gear consisting of a row and one gear 42 is rotatably supported. Furthermore, the base 39 is connected to a plunger 43a and a spring 45 of a solenoid 43, and is located at a position where the forward transmission system gear trains 40 and 41 mesh between the photosensitive drum gear 1g and the charging roller gear 2g (FIG. 3). a)
) and the position where the opposite direction transmission gear 42 meshes (see Fig. 3).
(b)). The solenoid 43 is connected to the charging control means 16, and when the switch 2b is turned on and is in a charging state, the solenoid 43
When the switch 2b is turned off and the switch 2b is turned off, the solenoid 43 is turned on.

Next, the operation of the above-mentioned embodiment will be explained.

When the copy button of the copying machine 20 is pressed to perform a copying operation, the document table 33 on which the document is placed moves and the photosensitive drum 1 rotates. The light from the illumination lamp 35 is reflected by the moving original and is exposed onto the photosensitive drum 1 by the short focus optical element array 3. At this time, based on the signal from the charging control means 16, the switch 2b
is in the on state, and the solenoid 43 is in the off state. Therefore, a predetermined bias voltage is applied to the charging roller 2 from the primary charging power source 2a, and the drive unit 11 is moved to the position shown in FIG. 3(a) by the spring 45. The rotation of the photosensitive drum 1 in the direction of arrow m is controlled by the forward transmission system gear train 4.
1 and 40 to the charging roller 2 as a forward rotation a whose contact surfaces move in the same direction and at the same speed. As a result, the charging roller 2 is placed on the surface of the photosensitive drum 1.
The photosensitive drum is uniformly charged with a negative charge, and as described above, the photosensitive drum is exposed to light L to form an electrostatic latent image. Then, toner t is attracted to the electrostatic latent image from the developing cylinder 5b of the developing device 5, and a toner image is formed. On the other hand, the transfer paper P from the paper feed tray 23 is being conveyed by the paper feed roller 27 and the registration roller 29 at the same timing, and the toner image on the photosensitive drum 1 is transferred onto the transfer paper P by the transfer roller 6. , the transfer paper P is fixed by a fixing roller 30 and discharged onto a paper discharge tray 25 by a paper discharge roller 32.

The toner t remaining on the photosensitive drum 1 is then carried to the charging roller 2, as shown in FIG. It is scraped off by the nip portion of the roller 2 and falls into the waste toner storage container 7a. At this time, it is necessary to position the rotating shaft 2c of the charging roller 2 and the rotating shaft 1c of the photosensitive drum 1 accurately and reliably to prevent each other from running away. Since both shafts are disposed in the cartridge case 10, which is made of one piece, both shafts are supported in a highly accurate and reliable positioning state. In addition, some of the residual toner t accumulates in the nip, and
Further, a small amount of the charged particles slips through the nip portion so as not to impede the charging performance of the charging roller 2. The residual toner t that has slipped through is separated from the photosensitive drum 1 and attached to the charging roller 2 due to the difference in releasability between the surfaces of the photosensitive drum 1 made of polycarbon and the charging roller 2 made of tray rubber, and is further attached to the charging roller 2. The toner t attached to the roller 2 is scraped off by the scraper 13 and placed in the waste toner container 7a.
contained within.

[0033] When no image is formed on the photosensitive drum 1, for example, during a predetermined period of time after the image forming operation is completed, or when the transfer paper is continuously fed, the gap between the sheets is
Or, in the preparation stage before starting image forming work,
b) As shown in FIG. 3(b), the switch 2b is turned off and the solenoid 43 is energized by the signal from the charging control means 16 (see FIG. 3(b)). In this state, the photosensitive drum gear 1g and the charging roller gear 2g are in mesh with each other via the opposite direction transmission gear 42, so that the rotation of the photosensitive drum 1 in the direction of the arrow m is caused by the contact portion of the photosensitive drum 1 being relative to the charging roller 2 in the opposite direction. It is transmitted as a moving opposite direction rotation b. Therefore, as shown in FIG. 4(b), the residual toner t accumulated in the nip between the photosensitive drum 1 and the charging roller 2 due to the previous rotation in the forward direction is removed by the rotation of the charging roller in the opposite direction, and the waste toner is stored. It is dropped into the container 7a. At this time, even if the charging roller 2 is rotated in the opposite direction, no bias voltage is applied to the charging roller 2 due to the switch 2b being turned off, and no image is formed on the photosensitive drum 1. And image formation defects etc. do not occur.

As a result, even if the cleaning blade is abolished, the residual toner on the photosensitive drum 1 can be reliably cleaned by the charging roller 2, and the toner accumulated in the nip can be removed by rotating the charging roller 2 in the opposite direction in a timely manner. can be discharged reliably.

Next, a partially modified driving means will be explained with reference to FIGS. 5 and 6. The driving means 11' according to the present embodiment is a counter-direction transmission gear train in which an intermediate idle gear 42' is interposed between a gear 1g connected to the photosensitive drum 1 and a gear 2g connected to the charging roller 2. A spring clutch 45 operated by a signal from the charging control means 16 is interposed between the charging roller 2 and the gear 1g.

As a result, when a predetermined bias voltage is applied to the charging roller 2 and the charging roller 2 is in a charged state, the charging control means 1
Based on the signal from 6, the spring clutch 11' is in the disengaged state. In this state, the spring clutch 45 is in the disengaged state, so the rotation of the photosensitive drum 1 is directly transmitted to the charging roller 2 by frictional contact, and the charging roller 2 is transmitted in the forward direction and in the same direction as the rotation of the photosensitive drum 1. Driven rotation at speed. Further, when the spring clutch 45 is connected in response to a signal from the charging control means 16 in a non-charging state in which the bias voltage is not applied to the charging roller 2 in a non-image forming area, the rotation of the photosensitive drum 1 is caused to occur. Rotation b in the opposite direction is transmitted to the charging roller 2 via the gear 1g, the intermediate idle gear 42', the gear 2g, and the spring clutch 45. As a result, toner accumulated in the nip portion is removed as in the previous embodiment.

Next, another embodiment of the present invention will be described with reference to FIG. It should be noted that, except for the charging roller and the cleaning device, this embodiment is the same as the previous embodiment, so the same reference numerals are given and the explanation thereof will be omitted.

The charging roller 2 is connected to a predetermined bias power source 2a for charging, as in the previous embodiment. Further, the cleaning device 7 has a waste toner storage container 7a, a scraper 13 is fixed to the top wall 10c of the container 7a, and a sheet extending upward is fixed to the bottom wall 10d of the container 7a. 36 is fixed. On the other hand, as shown in FIG. 8, an intermediate idle gear 42' is interposed between a gear 1g that is interlocked with the photosensitive drum 1 and a gear 2g that is interlocked with the charging drum 2. The rotation of charging roller 2 via gears 1g, 42', 2g
is transmitted as rotation in the opposing direction b. The tip of the scraper 13 is in contact with the charging roller 2 in a counter direction with respect to its rotational direction, and the tip of the sheet 36 is in contact with the charging roller 2 in the forward rotational direction to accommodate waste toner. This prevents the waste toner inside the container 7a from scattering.

The charging roller 2 contains a magnetic component, and the toner is made of, for example, a one-component magnetic toner in which magnetic powder is mixed in a resin. As an example, the charging roller 1 is constructed by dispersing a magnet material having excellent magnetic properties, such as samarium-based material, and a conductive material such as carbon in a base material such as vidrin rubber.

As a result, in this embodiment, as in the previous embodiment, the charging roller 2 is
The photosensitive drum 1 is uniformly charged. Based on its magnetic component, the residual toner t on the photosensitive drum 1 is attracted onto the roller by a magnet constituting the charging roller 2, and the roller 2 further rotates in the opposite direction and comes into contact with the scraper 12. As a result, the toner t magnetized on the roller is scraped into the waste toner storage container 7a. Therefore, the surface of the photosensitive drum 1 is constantly cleaned by the charging roller 1, and at the same time a predetermined charge is applied to the photosensitive drum 1, which is then repeatedly used for image formation.

Note that the means for imparting a predetermined magnetic absorption force to the charging roller 2 is not limited to the above-mentioned mixing of the magnetic material, but as shown in FIG. Alternatively, the north and south poles may be arranged alternately in the circumferential direction. Furthermore, as another example, FIG.
As shown in FIG. 2, an annular magnet layer 2m is provided at the radially intermediate portion of the charging roller 2, or the shaft core 2c is formed of a magnet. Furthermore, the shaft core 2c may be made of a magnet, and an intermediate annular magnet layer 2m may be provided.

That is, the magnet 2m may be provided at any position from the axis of the charging roller to the surface, and it is preferable that the surface magnetic force is about 500G at the peak of the pole position. As a result, the residual toner containing the magnetic material on the photosensitive drum 1 is removed.
The charging roller 2 absorbs magnetism.

Although the above-mentioned embodiment has been described with respect to a small-sized copying machine having a process cartridge K, the present invention is not limited to this, and is applicable to other copying machines, laser beam printers, color copying machines, electrostatic recording devices, etc. The same applies to devices.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a process cartridge showing a first embodiment to which the present invention is applied.

FIG. 2 is a schematic sectional view of a copying machine according to a first embodiment.

FIG. 3 is a front view showing a drive unit that switches the rotation of the charging roller between the forward direction and the opposing direction, with (a) showing the forward rotation state and (b) showing the opposing direction rotation state.

FIG. 4 is a front view showing the removal of residual toner by the charging roller, in which (a) shows the state of forward rotation, and (b) shows the state of rotation in the opposite direction.

FIG. 5 is a side view showing another embodiment in which the rotation direction of the charging roller is switched.

FIG. 6 is a front view thereof.

FIG. 7 is a sectional view of a process cartridge showing a second embodiment to which the present invention is applied.

FIG. 8 is a front view showing the drive mechanism.

FIG. 9 is a perspective view showing a partially modified charging roller.

FIG. 10 is a front view showing another modification of the charging roller.

FIG. 11 is a sectional view showing a previously proposed process cartridge.

[Explanation of symbols]

1 Image carrier (photosensitive drum) 2
Charging rotating body (charging roller) 2m Magnet 3 Latent image forming section (short focus optical element array, exposure section) 5 Developing device 6 Transfer section (roller) 7 Cleaning means (device) 7a
Waste toner storage container 11, 11' Driving means (unit) 13
Scraper 16 Charge control means

Claims (4)

[Claims] 1. An image carrier that is rotationally driven, a charging rotating body that contacts the surface of the image carrier to charge the image carrier, and a latent image that forms an electrostatic latent image on the image carrier. In the image forming apparatus, the image forming apparatus includes a forming section, a developing device that applies toner to the electrostatic latent image, and a waste toner container, wherein the charging rotating body faces the waste toner container. place,
The charging rotary body constitutes a cleaning unit that removes toner from the image carrier and stores it in the waste toner storage container, and the charging rotary body moves in a forward direction with respect to the image carrier during charging. An image forming apparatus that rotates and rotates in the opposite direction through a driving means that transmits rotation in the opposite direction to the image carrier at least when the image carrier is not charged. 2. An image carrier that is rotationally driven, a charging rotating body that contacts the surface of the image carrier to charge the image carrier, and a latent image that forms an electrostatic latent image on the image carrier. In the image forming apparatus, the image forming apparatus includes a forming section, a developing device that attaches toner to the electrostatic latent image, and a waste toner storage container, wherein the toner contains a magnetic material, and the charging rotation The body has a magnet and has a magnetic absorption force capable of magnetically attaching the toner to the surface thereof, and the charging rotary body is disposed facing the waste toner storage container, and the charging rotary body is arranged to face the waste toner storage container. An image forming apparatus comprising a cleaning means for removing toner and storing the toner in the waste toner storage container. 3. The image forming apparatus according to claim 1, further comprising a scraper that comes into contact with the charging rotating body to scrape off toner adhering to the surface of the rotating body. 4. The image forming apparatus according to claim 1, wherein the image bearing member, the charging rotary member, the developing device, and the waste toner storage container are arranged in a process cartridge that is removably attached to the main body of the image forming apparatus. 2. The image forming apparatus according to 2.