JPH0922200A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a grinding member from shaving a device constituting member other than a recording material carrier by constituting so that an area where the grinding member grinds the recording material carrier may be included in an area where the rocking recording material carrier exists. SOLUTION: A carrying belt 130 is turned while it is repeatedly deviated to both sides in a thrust direction with fixed rocking width. A grinding roller 30 must grind at least the area of the belt 130 having the possibility of carrying a recording material P to which releasing agent oil adheres. A grinding roller pressing member 32 is provided at a position where it is opposed to the roller 30 by interposing the belt 130 in between, and presses the belt 130 to the roller 30. The pressing member is provided to be larger than the width of the roller 30 in the thrust direction. Therefore, the area where the roller 30 grinds the belt 130 is included in an area where the belt 130 exists regardless of the rocking of the belt 130 so that the roller 30 may not shave the pressing member 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for forming an image on a recording material carried on a recording material carrier, and for example, an image forming apparatus such as a copying machine or a laser beam printer using an electrophotographic method. Regarding

[0002]

BACKGROUND ART A plurality of photoconductors and a transfer belt that carries and conveys recording materials are provided, and the toner images of different colors formed on the respective photoconductors are sequentially superposed and transferred onto the recording materials carried on the transfer belts. Has proposed a color image forming apparatus for obtaining a color image.

The above-mentioned color image forming apparatus is useful in terms of high productivity, but in order to support the transfer belt by a plurality of supporting rollers, the width direction (thrust direction, that is, supporting direction) perpendicular to the rotating direction of the transfer belt is supported. This causes deviations in the axial direction of the roller) and damages to the belt end, and other problems occur.

The deviation of the transfer belt causes a difference in tension of the transfer belt in the thrust direction due to a difference in the peripheral length of the belt in the thrust direction, a difference in the peripheral length of the support rollers, a distortion of the belt support unit, and the like. This is because stress is applied in either direction.

Therefore, as a measure for preventing the belt from deviating, for example, (a) a method of providing a rib on the back surface of the transfer belt. (B) A method in which the diameter of the central portion of the support roller in the axial direction is set to be larger than the diameter of both end portions in the axial direction, and the support roller is molded into a so-called crown shape. (C) A method in which a sprocket is provided at the end of the support roller in the axial direction, and perforations having the same width as the pitch between the claws of the sprocket are provided at the portion of the transfer belt corresponding to the claws of the sprocket. Etc. have been proposed.

However, although the method (a) has the advantage of requiring a simple structure, the rib always receives a force in the thrust direction, which is likely to cause deformation or damage.
It is difficult to ensure stable operation over a long period of time.

In the above method (b), the endless transfer belt is distorted by forming the support roller into a crown shape to generate an internal stress difference, thereby suppressing the deviation of the transfer belt. However, it is necessary to use a transfer belt made of a material having sufficient strength and elasticity, and if the thickness of the belt is increased in order to obtain strength, there is also a problem that the transfer current must be set large.

Further, in the above method (c), since the pitch accuracy of the sprocket and perforation has a great influence on the accuracy of the transfer belt moving speed control, the transfer belt in which highly accurate moving speed control is essential is essential. It is not appropriate to adopt it.

As described above, it is quite difficult to perform good image transfer without causing the transfer belt to shift in the thrust direction.

Therefore, it has been proposed to rotate the transfer belt by repeatedly shifting the transfer belt in a certain width in both thrust directions.

The width of deviation in both thrust directions is called the swing width.

[0012]

However, when the transfer belt is rotated while repeatedly shifting the transfer belt in a certain constant width in both thrust directions, defective cleaning of the transfer belt occurs depending on the size of the swing width. To do.

Further, in the apparatus for preventing the oil adhering to the recording material from being transferred to the transfer belt by providing a polishing member for polishing the surface of the transfer belt for carrying the recording material to roughen it, the swing width is large. Depending on the size, it is conceivable that the above-mentioned polishing member will scrape the device constituent members other than the transfer belt.

[0014]

SUMMARY OF THE INVENTION To solve the above problems, the present invention provides a recording material carrier for carrying and conveying a recording material, and image formation for forming an image on the recording material carried by the recording material carrier. An image forming device including: a unit, a swinging unit that swings the recording material carrier in a direction orthogonal to its moving direction, and a polishing member that polishes the surface of the recording material carrier that carries the recording material. In the apparatus, a region in which the polishing member polishes the recording material carrier regardless of the swing of the recording material carrier is included in a region where the recording material carrier exists. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) The color image forming apparatus of the present invention and the first embodiment will be described with reference to FIG.

In the apparatus, first, second, third and fourth image forming portions Pa, Pb, Pc and Pd are arranged in parallel, and toner images of different colors are used for the latent image, development and transfer processes. Is formed.

The image forming portions Pa, Pb, Pc and Pd are
Each of the photosensitive drums 3 is provided with a dedicated image carrier, in this example, the electrophotographic photosensitive drums 3a, 3b, 3c and 3d.
A toner image of each color is formed on a, 3b, 3c and 3d. A recording material carrying member (conveying belt) 130 is installed adjacent to each of the photosensitive drums 3a to 3d.
The toner images of the respective colors formed on b, 3c, and 3d are transferred onto the recording material P carried on the carrying belt 130 and carried. Further, the recording material P on which the toner image of each color is transferred is
After the toner image is fixed by heating and pressurizing in the fixing unit 9, it is discharged as a recorded image outside the apparatus.

Exposure lamps 111a, 111b and 11 are provided on the outer circumferences of the photosensitive drums 3a, 3b, 3c and 3d, respectively.
1c and 111d, drum chargers 2a, 2b, 2c and 2d, potential sensors 113a, 113b, 113c and 113d, developing devices 1a, 1b, 1c and 1d, blade transfer chargers 24a, 24b, 24c and 24d, and cleaner 4a. 4b, 4c and 4d are provided, and a light source device and a polygon mirror 1 (not shown) are further provided above the device.
17 are installed.

The polygon mirror 117 is rotated to scan the laser light emitted from the light source device, the light flux of the scanning light is deflected by the reflection mirror, and the fθ lens is used on the generatrix of the photosensitive drums 3a, 3b, 3c and 3d. A latent image corresponding to an image signal is formed on the photosensitive drums 3a, 3b, 3c, and 3d by condensing and exposing.

The developing units 1a, 1b, 1c and 1d are filled with a predetermined amount of cyan, magenta, yellow and black toners as a developer by a supply device (not shown). The developing devices 1a, 1b, 1c and 1d develop the latent images on the photosensitive drums 3a, 3b, 3c and 3d, respectively, and visualize them as cyan toner images, magenta toner images, yellow toner images and black toner images.

The recording material P is accommodated in the recording material cassette 10, from which a plurality of conveying rollers and registration rollers 12 are provided.
Is supplied onto the transport belt 130 through the
When the sheet is conveyed by 0, it is sequentially sent to the transfer section facing the photosensitive drums 3a, 3b, 3c and 3d.

The conveyor belt 130 is made of a dielectric resin sheet such as a polyethylene terephthalate resin sheet (PET sheet), a polyvinylidene fluoride resin sheet, or a polyurethane resin sheet, and both ends thereof are superposed and joined to each other. , Either endless or seamless (seamless) belts are used.

In the case of a belt having no seam, it is not only difficult to manufacture it so as to have uniform physical properties, but also from the viewpoints of stability of the belt circumference and manufacturing time,
It is not suitable for mass production in terms of cost. On the other hand, in the case of a belt having a seam, the unevenness of the seam portion and the change of the physical properties such as the resistance value are unavoidable, and the image is disturbed when the image is formed on the seam. Therefore, in order to obtain a high quality image, the circumference of the conveyor belt 130 is set to the total length of the length of the recording material and the length of the gap between the recording material and the next recording material (length between papers). In addition to making it an integral multiple, it is general to provide a means for detecting the seam position so as not to form an image on the seam.

As a means for detecting the seam position, a reflective optical sensor is used when the conveyor belt 130 is opaque, and a seam position is detected by providing a detection mark having different light reflection characteristics at the seam portion. When the transport belt 130 is transparent, the transmissive optical sensor is used to directly detect the seam position, or the displacement sensor is used to mechanically detect the seam position by means of the notches or protrusions provided at the seam.

The conveyor belt 130 of this embodiment is rotated while repeatedly shifting in both thrust directions with a certain swing width.

This swing mechanism will be described with reference to FIG.

FIG. 8 shows an example in which the swinging mechanism is installed on the belt rotating mechanism side, which is often performed especially when a thin belt which is advantageous for improving the dielectric constant is used as the conveyor belt 130.

As shown in FIG. 1 above, the conveyor belt 130
Is suspended around a drive roller 13 on the downstream side in the transport direction and a pair of support rollers 14 and 15 on the upstream side. The drive roller 13 is a roller having a rubber surface layer, and is rotationally driven to rotate the conveyor belt 130. Both ends of the support roller 14 are fixed using springs or the like, and the tension of the rotating conveyor belt 130 is kept constant.
The support roller 15 is a swing roller that causes the transport belt 130 to swing.

FIG. 8 shows the swing roller 15 and the conveyor belt 1.
FIG. 13 is a plan view of 30 viewed from the support roller 14 side, showing the movement of the swing roller 15 when swinging. The conveyor belt 130 is located below the swing roller 15 and moves in the upward C direction as seen in the figure. Detection sensors A ′ and B ′ that detect when both end portions of the conveyor belt 130 are deviated to the α side and the β side, respectively, are provided near the outer ends α and β of the conveyor belt 130 in the width direction. .
When the detection sensor A ′ detects the deviation of the conveyor belt 130 toward the α side, the swing roller 15 moves in the direction A in the upper part of the drawing, thereby moving the conveyor belt 130 in the leftward direction a. Similarly, the detection sensor B ′ is the conveyor belt 1
When the deviation of 30 toward the β side is detected, the swing roller 15 moves in the downward B direction, thereby moving the conveyor belt 130 in the rightward b direction.

As described above, the conveyor belt 130 has α
-Rotate while swinging between β. The swing width described above is
From the distance between α and β, which is the full width of the swing, the conveyor belt 130
Subtract the width of and divide by 2 to obtain the one-sided amount.

Now, when it is confirmed that the conveyor belt 130 rotates and is in a predetermined position, the registration roller 1
The recording material P is sent out from 2 to the conveyor belt 130, and the recording material P is conveyed toward the transfer portion of the first image forming portion Pa. At the same time, the image writing signal is turned on, and the image is formed on the photosensitive drum 3a of the first image forming portion Pa at a certain timing based on the signal. Then, the blade transfer charger 24a applies an electric field or an electric charge at a transfer portion below the photosensitive drum 3a, so that the toner image of the first color formed on the photosensitive drum 3a is transferred onto the recording material P. . By this transfer, the recording material P is firmly held on the conveyor belt 130 by electrostatic attraction, and the second image forming portion Pb
It is conveyed later.

Similarly, image formation and transfer are performed in the second image forming portion Pb to the fourth image forming portion Pd. Next, the recording material P on which the toner images of four colors have been transferred is discharged at the downstream portion of the transport belt 130 in the transport direction by the separation charger 32 and the electrostatic attraction force is attenuated. Leave from. Recording material P that has left
Is transported to the fixing device 9 by the transport unit 62.

The fixing device 9 includes a fixing roller 51, a pressure roller 52, heat-resistant cleaning members 54 and 55 for cleaning each of them, roller heaters 56 and 57 installed in the rollers 51 and 52, and fixing. The roller 51 comprises a coating roller 50 for coating a release agent oil such as dimethyl silicone oil, a reservoir 53 for the oil, and a thermistor 58 for detecting the temperature of the surface of the pressure roller 52 and controlling the fixing temperature. . The recording material P to which the four color toner images have been transferred is mixed with the toner images and fixed to the recording material P by this fixing device, and a full color copy image is formed.

By the way, the color toner is required to have good melting property and color mixing property when heated by the fixing device 9. If the melting and color mixing properties are poor, the air gap between the toner particles will increase, and the toner will lose its original color tone due to the scattering of light at the interface with the air. This is because the above toner is hidden by the toner in the upper layer and the color reproducibility is deteriorated. As a toner satisfying these melting properties and color mixing properties, a so-called sharp melt toner having a low softening point and a low melt viscosity is used. By using such a sharp melt toner, color reproducibility can be enhanced and a color copy faithful to the original can be obtained.

However, the sharp melt toner has a large affinity and therefore has a drawback that it is apt to be offset to the fixing roller of the fixing device. In the fixing device, pressure is applied in addition to heating, and the toner having a high affinity has a tendency to be transferred and adhered to the fixing roller by the heating and pressing. When toner adheres to the fixing roller, this toner adheres to the next recording material or solidifies on the fixing roller.
Either of them causes a defective image.

The release agent oil such as dimethyl silicone is
It is used to prevent the occurrence of these image defects, and a releasing agent oil is applied onto the fixing roller before fixing the toner image on the recording material. As a result, when the recording material onto which the toner image has been transferred is heated and pressed, the fixing roller does not come into direct contact with the toner image via the release agent oil, so the toner adheres to the fixing roller side. Can be effectively prevented.

Photosensitive drums 3a, 3b, 3 for which transfer has been completed
The toners c and 3d are cleaned and removed by the cleaners 4a, 4b, 4c and 4d, respectively, and the residual toner after transfer is prepared for the subsequent latent image formation. Toner and other foreign matter remaining on the conveyor belt 130 are
A cleaning web (nonwoven fabric) 19 is brought into contact with the surface of the conveyor belt 130 and wiped off.

The cleaning web 19 is wound around one web roller 18 of a pair of rollers arranged below the downstream end of the conveyor belt 130, and is wound around the other roller 17. ing. Rollers 17, 1
A pressing roller 22 is arranged between the rollers 8 and the cleaning web 19 is conveyed by the pressing roller 22.
Press on the surface of. The pressing roller 22 presses the cleaning web 19 against the conveyor belt 130 by the opposing roller 21 disposed on the back surface side (inner side) of the conveyor belt 130.
Backed up by.

As the fibers of the cleaning web 19,
Fibers such as polypropylene, rayon, acrylic, nylon, polyester and vinylon, and mixtures of these fibers are preferred.

When performing double-sided image formation on the recording material P, after the transfer of the first side is completed and the recording material P has passed through the fixing device 9, the recording material P is not conveyed to the discharge tray 63, but a flapper (reversing member) or the like is used. The sheet is conveyed to a conveying path dedicated to double-sided image formation.
Then, the recording material P is turned upside down and the transport belt 130 is retransmitted, and the image formation is performed again on the second surface opposite to the first surface (first surface) where the image formation is completed. At this time, the release agent oil adhering to the first surface of the recording material P, especially to the toner image thereof, adheres to the surface of the conveyor belt 130, and further adheres from the conveyor belt 130 to the photosensitive drums 3a to 3d.

Cleaners 4a-4 of the photosensitive drums 3a-3d
The purpose of d is to remove the toner on the photosensitive drums 3a to 3d, and the release agent oil attached cannot be removed sufficiently. For this reason, a problem peculiar to double-sided color copying occurs that an image is defective due to the release agent oil contamination of the photosensitive drum.
Therefore, the cleaning web 19, which is a cleaning member of the conveyor belt 130, cleans not only the residual toner on the surface of the conveyor belt 130 but also the release agent oil adhering to the surface.

However, when the amount of the release agent oil adhering to the conveyor belt 130 is large, the cleaning web 19
It is conceivable that the cleaning may be insufficient and the similar image defects may occur.

Therefore, in this embodiment, an oil removing roller 31 for further improving the oil removing ability on the conveyor belt is provided.

A polishing roller 30 is also provided for roughening the surface of the conveyor belt 130 on which the recording material P is carried so that the oil adhering to the recording material P does not easily transfer to the conveyor belt 130.

Here, the conveyor belt 1 used in this embodiment.
In the case where the ten-point average roughness Rz is 5 to 20 μm, the conveying belt 13 indicates the image surface of the recording material P to which the release agent oil is attached.
Even when a double-sided image was formed in contact with 0, the release agent oil was hard to remain on the surface of the conveyor belt 130.

This is because the contact area between the conveyor belt 130 and the recording material P is reduced.

Therefore, in the present embodiment, the polishing roller 3 is adjusted so that the ten-point average roughness Rz of the conveyor belt 130 falls within a predetermined value.
0 is arranged such that it can be brought into contact with and separated from the conveyor belt 130.

As the polishing roller 30, for example, a metal roll wound with an aluminum oxide film or coated with aluminum oxide is used, and the particle spacing of aluminum oxide is preferably 15 μm to 60 μm.

When the polishing roller 30 is brought into contact with the conveyor belt 130 to perform the roughening operation, it may be stationary with respect to the conveyor belt or may be rotated so as to have a peripheral speed difference.

From the experimental results, the initial ten-point average roughness Rz =
Rz of 10 μm conveyor belt is equivalent to about 5,000 sheets of A4 size laterally fed recording material.

[0051]

[Outside 1] Becomes

Therefore, the polishing operation was performed at a timing of exceeding 5000 sheets.

In the present embodiment, when the linear velocity of the conveyor belt 130 is 16 mm / sec and the polishing roller 30 enters the conveyor belt 130 at a total pressure of about 1.2 kg · f and is stationary, the conveyor belt is polished for about 10 rounds and Rz ≧. 8 μm was achieved.

Further, the release agent oil adhering to the conveyor belt 130 is more effectively removed. Oil removing roller 3
As shown in FIG. 3, 1 is composed of three layers provided on a cored bar 31d.

The surface layer 31a is a non-woven fabric composed mainly of nylon and polyester, absorbs the oil adhering to the voids by a capillary phenomenon, and retains the oil with the polypropylene of the second layer 31b. Further, the third layer 31c uses ethylene propylene rubber which functions as a cushion for ensuring a nip between the oil removing roller 31 and the conveyor belt 130.

The oil removing roller 31 operates by rotating in the forward direction at 160% of the peripheral speed of the conveyor belt,
The oil absorption rate was highest during this rotation.

The oil removing roller 31 transfers the release agent oil adhering to the recording material P to the conveying belt 130 when forming the image on the second surface of both sides, that is, when fixing the toner image on the first surface of the recording material P. Always work when possible.

FIG. 2 is an explanatory view showing a method of defining the width in the thrust direction of the cleaning web 19, the pressing roller 22, the polishing roller 30, and the oil removing roller 31 in this embodiment. As shown in FIG. 2, the swing width of the conveyor belt 130 having a width of 334 mm is 8 on both the α side and the β side.
mm.

Therefore, the width in which the conveyor belt 130 swinging in the thrust direction due to the rotation can exist is 350 mm.

On the contrary, the width in which the conveyor belt 130 is always present is 318 mm regardless of the swing in the thrust direction.

The cleaning web 19 is the conveyor belt 1.
In order to maintain the cleaning performance, it is important that the conveyance belt 130 is in contact with the entire portion of the width of the conveyance belt 130 in the thrust direction even if the vibration is generated. Therefore, the width of the cleaning web 19 needs to be at least 350 mm, which is the same as the width of the conveyor belt 130 (belt existence width).

Therefore, in the present embodiment, the width of the cleaning web 19 in the thrust direction is set to 354 mm in consideration of the possibility that the cleaning web 19 itself may be slightly displaced in the thrust direction due to the swing of the conveyor belt 130.

The pressing roller 22 is wider than that,
It is necessary to uniformly press the cleaning web 19. In this embodiment, the pressing roller 22 has a thrust direction width of 360 mm.

Further, it is necessary for the polishing roller 30 to polish at least the region of the conveyor belt 130 where the recording material P to which the release oil has adhered may be carried.

Here, the maximum thrust width of the recording material P carried by the conveyor belt 130 of this embodiment is 297 mm (A3
Since the vertical feed or the A4 horizontal feed) is taken into consideration, when considering the swing width of the transport belt 130 in the thrust direction, the width in the thrust direction in which the transport belt 130 may carry the recording material P is 313 mm.

Therefore, in this embodiment, the width of the polishing roller 30 in the thrust direction needs to be 313 mm or more.

However, the width in the thrust direction of the polishing roller 30 is such that the belt always exists regardless of the swing of the conveyor belt (absolute belt width in FIG. 2, 318 mm).
If it is larger than the above, the following problems may occur.

That is, in this embodiment, as shown in FIG.
A polishing roller pressing member 32 is provided at a position facing the polishing roller 30 and the conveyor belt 130, and presses the conveyor belt 130 against the polishing roller 30.

The polishing roller pressing member 32 is made of an elastic material such as urethane foam and is provided at least wider than the width of the polishing roller 30 in the thrust direction.

Therefore, since the polishing roller 30 is almost rigid, the width of the polishing roller 30 in the thrust direction is larger than the absolute width of the belt, and there is a region where the polishing roller 30 and the polishing roller pressing member 32 are in direct contact with each other. In this case, the polishing roller 30 may scrape the pressing member 32.

For the above reasons, the width of the polishing roller 30 in the thrust direction is preferably 318 mm or less in this embodiment.

Therefore, in this embodiment, the width of the polishing roller 30 in the thrust direction is set to 318 mm.

The width of the oil removing roller 31 in the thrust direction needs to be equal to or larger than the width (313 mm) at which the above-mentioned conveying belt 130 may carry the recording material P, and is set to 350 mm in this embodiment.

The cleaning web 19 of the conveyor belt 130 does not need to be continuously renewed on a new surface, and may be used in such a manner that a fixed amount is wound for each fixed number of image formations. For example, if the number of formed images is 100, the cleaning web 19
Was wound on the winding roller 17 by 5 mm and renewed.

Further, as shown in FIG. 4, a cleaning blade 23 made of polyurethane rubber may be provided as a cleaning assisting means. This cleaning blade 23
Used a JIS rubber altitude of about 65 degrees. The cleaning blade 23 was brought into contact with the surface of the conveyor belt 130 between the contact portion of the cleaning web 19 with the conveyor belt 130 and the take-up roller 17. The contact angle of the cleaning blade 23 with the conveyor belt 130 is about 20 degrees,
The penetration amount was set to 1.5 to 2.0 mm.

The cleaning blade 23 cannot be sufficiently cleaned with the cleaning web 19 intended for wiping off the scattered toner, paper dust and the like adhering to the conveyor belt 130, especially when the conveyor belt 130 is defective due to improper conveyance of the recording material. If a toner image has been formed on the upper surface, or if there is more toner than usual for stabilizing control of the recorded image (for example, it is used for feedback control etc. to maintain registration and uniformity of density). When it can be predicted in advance that a patch image is formed on the conveyor belt 130, it contacts the conveyor belt 130, and is otherwise separated.

According to this structure, after the foreign matter such as toner and dust adhering to the surface of the conveyor belt 130 is almost removed by the cleaning blade 23, the next cleaning web 19 causes not only the toner and foreign matter but also the release agent. Good oil removal. Therefore, the cleaning performance of the conveyor belt 130 is improved.

The toner scraped off by the cleaning web 19 is collected by the winding roller 17 together with the cleaning web 19.

Although the cleaning blade 23 is used as the cleaning assisting means in the above, a fur brush may be used instead.

Further, as shown in FIG. 5, in addition to the contact of the cleaning web 19 with the conveyor belt 130 by the pressing roller 22, the back surface of the cleaning web 19 opposite to the contact surface is covered by one of the rollers 17, 18. It is more effective to contact the conveyor belt 130 by pressing the rollers at those positions.

In the case shown in FIG. 6, the back surface of the cleaning web 19 is brought into contact with the conveyor belt 130 at both positions of the rollers 17 and 18, and the cleaning blade 23 is interposed between the roller 17 and the pressing roller 22. Touched against. With this configuration, the cleaning ability can be further improved.

Further, when the toner image is formed on the second surface of the recording material P having the toner image fixed on the first surface, it is preferable to improve the oil cleaning ability of the cleaning web 19.

Therefore, when the image is formed on the second side, it is preferable to increase the winding amount of the cleaning web 19 as compared to when the image is formed on the first side.

[0084]

According to the present invention, it is possible to prevent the polishing member from scraping off the components of the apparatus other than the recording material carrier due to the rocking of the recording material carrier.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a color image forming apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a method of defining a width in a thrust direction of a conveyor belt, a cleaning web, a polishing roller and the like.

FIG. 3 is a configuration cross-sectional view of an oil removing roller.

FIG. 4 is a schematic cross-sectional view showing the vicinity of a cleaning portion of a conveyor belt.

FIG. 5 is a schematic cross-sectional view showing the vicinity of the cleaning section of the conveyor belt.

FIG. 6 is a schematic cross-sectional view showing the vicinity of a cleaning portion of a conveyor belt.

FIG. 7 is an explanatory view showing a swing mechanism by a swing roller.

Claims (7)

[Claims] A recording material carrier that carries and conveys the recording material;
Image forming means for forming an image on the recording material carried on the recording material carrier, rocking means for rocking the recording material carrier in a direction orthogonal to its moving direction, and recording on the recording material carrier. In an image forming apparatus including a polishing member that polishes a surface on which a material is supported, an area in which the polishing member polishes the recording material carrier is the recording material regardless of the swing of the recording material carrier. An image forming apparatus characterized by being included in a region where a material carrier exists. 2. The image forming apparatus comprises a pressing member that presses the recording material carrier toward the polishing member from the side opposite to the side of the recording material carrier that carries the recording material. The image forming apparatus according to claim 1. 3. The image forming apparatus according to claim 1, wherein the polishing member polishes the recording material carrier every time the image forming unit forms an image on a predetermined number of recording materials. apparatus. 4. An area where the polishing member polishes the recording material carrier is the recording material carrier in a direction orthogonal to the moving direction of the recording material carrier, regardless of the swing of the recording material carrier. The image forming apparatus according to claim 1, wherein the image forming apparatus includes a region for supporting a recording material. 5. The image forming apparatus includes an oil removing unit that removes oil adhering to the surface of the recording material carrying body on which the recording material is carried, and the oil removing means attaches to the recording material carrying body. The region where the oil is removed includes a region where the recording material carrier carries the recording material in a direction orthogonal to the moving direction of the recording material carrier, regardless of the swing of the recording material carrier. The image forming apparatus according to any one of claims 1 to 4. 6. The image forming unit includes an image carrier that carries a toner image, and a transfer charger that transfers the toner image to a recording material carried by the recording material carrier. The image forming apparatus according to any one of claims 1 to 5. 7. The image forming apparatus according to claim 6, wherein the plurality of toner images are sequentially transferred and superposed on the recording material carried by the recording material carrier.