JP2001125446A - Belt conveyance device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cleaning performance of a conveyor belt and to prevent contamination with a substrate carried on the belt surface by cleaning an extension roller for the conveyor belt with a member having many gaps that foreign matters on the roller surface can enter. SOLUTION: In a transfer conveyance device 50, a roller cleaning member 81a is brought into surface contact with the surface of a driving roller 51a facing the conveyor belt 52 that a cleaning blade 53a comes into contact with so as to clean the surface of the driving roller 51a. The roller cleaning member is made of porous foamed urethane. Consequently, when the transfer conveyance device 50 degins to be driven, foreign matters sticking on the driving roller surface are scraped off by the roller cleaning member. Foreign matters which are left on the driving roller surface without being scraped off are taken in many holes of the roller cleaning member and then the cleaning performance of the roller cleaning member is not lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor having a conveyor belt stretched over a plurality of rollers and carrying a substance to be carried on its surface, or a copying machine, a facsimile machine using the belt conveyor, The present invention relates to cleaning of a roller that stretches the transport belt in an image forming apparatus such as a printer.

[0002]

2. Description of the Related Art Conventionally, as a belt conveying device for carrying and conveying a substance to be carried on a surface thereof, a conveying belt is stretched over a plurality of rollers, and the surface of the conveying belt is driven to move along a predetermined path. Various things are known.

[0003] In addition, this type of belt conveying device is also used in various ways in an image forming apparatus. For example, a photoreceptor belt for carrying a toner image visualized by a developing unit on the surface and transporting the toner image along a predetermined path, and a stage before transferring the toner image on the photoreceptor to a transfer material In some cases, a transfer belt of a belt transfer device is used as an image carrier for carrying an image, such as an intermediate transfer belt for temporarily holding the image. In some cases, the transfer belt is used as a transfer belt for transferring a transfer sheet or the like as a transfer material to a transfer position which is a region facing the image carrier.

In such a belt conveying device, transfer paper or an image before transfer is carried as a material to be carried on the surface of the conveyor belt. Also, various inconveniences occur due to adhesion of dirt. For example, when the material to be supported is transfer paper, dirt is transferred to the back surface of the transfer paper and becomes dirty on the back surface of the transfer paper. When the material to be supported is an image before transfer, dirt adheres to the image, and Or contamination. For this reason, there is conventionally known a belt transfer device provided with a belt cleaning means for cleaning the surface of the transfer belt.

[0005]

However, even when the belt cleaning means is provided, the surface of the conveyor belt may not be cleaned well. Then, the image carried on the surface of the photoreceptor belt or the intermediate transfer belt may be stained, and the back surface of the transfer paper carried and conveyed on the transfer belt may be stained. When the present inventor pursued this cause, the following was found.

[0006] Foreign matter enters between the conveyor belt and the roller on which it is stretched from the end in the width direction of the belt, and adheres to the roller surface. Examples of the foreign matter include paper dust, scattered toner and carrier, but are not limited thereto. Then, the foreign substances attached to the roller surface gradually aggregate. While the attachment and aggregation of the foreign matter are repeated, the aggregated foreign matter gradually grows, leading to the formation of a convex portion on the roller surface. Then, a convex portion also appears on the surface of the belt stretched over the roller. In particular, the roller facing the position where the belt cleaning unit is provided via the conveyor belt is pressed by a belt, for example, a cleaning blade used for the belt cleaning unit, and pressure is applied via the belt. Foreign matter easily adheres and agglomerates. This is considered to occur not only when a cleaning blade is used as the belt cleaning unit but also when any commonly used belt cleaning member is used regardless of the type of cleaning member used. .

FIG. 5 is a cross-sectional view showing a state in which a convex portion is generated on the belt surface due to foreign matter P attached to the roller surface. Thus, when the convex portion appears on the belt surface, the cleaning performance of the cleaning member that cleans the belt surface is reduced. For example, when a cleaning blade is used, the adhesion between the blade and the surface of the belt is reduced, and cleaning failure occurs at both ends of the convex portion in the belt width direction and on the downstream side in the belt conveyance direction.

As a result, the carried material such as the image and the transfer paper is carried with the stain adhered to the surface of the conveyor belt, and the contamination of the image, the stain on the back surface of the transfer paper, and the stain of the other carried material are reduced. It will happen. Therefore, it is desired to clean foreign matters adhered to the roller.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to remove a foreign substance attached to a roller on which a conveyor belt is stretched in a belt conveyor so that the conveyor belt is removed. An object of the present invention is to provide a belt conveyance device and an image forming apparatus which can maintain good cleaning performance of a belt cleaning means on a surface and can prevent contamination of a substance carried on a belt surface.

[0010] The applicant of the present invention uses a plate-shaped blade contacting the roller surface or a brush for rubbing the roller surface as a roller cleaning means for removing foreign matter attached to the roller on which the conveyor belt is stretched. A transfer device using a roller has been proposed (see Japanese Patent Application Laid-Open No. 5-333709).
The present invention also relates to the improvement of the roller cleaning means of the prior application.

[0011]

In order to achieve the above object, a belt transport device according to claim 1 is provided with a transport belt that is stretched over a plurality of rollers and carries a substance to be carried on its surface and transports the belt.
A belt cleaning device that faces at least one of the rollers via the transport belt and that cleans a transport surface of the transport belt. A roller cleaning member that is in contact with the roller so as to be relatively movable and that cleans the surface; a contact portion of the roller cleaning member with the roller has a large number of gaps into which foreign matter removed from the roller surface can enter; It is characterized by having.

In the belt conveying device according to the first aspect, among the plurality of rollers on which the conveying belt is stretched, a large number of contact portions of the roller cleaning member with the surface of the roller facing the belt cleaning means are provided. Because of the gap, foreign matter adhering to the surface of the roller can enter the gap. Usually, when the roller cleaning member is brought into contact with the roller surface and relatively moved, most of the foreign substances on the roller surface are scraped off from the surface, but a part of the foreign matter remains between the roller surface and the roller cleaning member. There is. Then, there is a possibility that the cleaning performance of the roller cleaning member is reduced by the remaining foreign matter. In the present invention, the foreign matter remaining between the roller surface and the roller cleaning member is caused to enter into a large number of gaps of the roller cleaning member, so that the contact state of the roller cleaning member with the roller surface is always kept good, The cleaning performance of the cleaning member can be maintained.

According to a second aspect of the present invention, in the belt conveying apparatus of the first aspect, a porous material is used as the roller cleaning member.

In the belt conveying device according to the second aspect, since a porous material is used for the roller cleaning member, it is not necessary to artificially provide a hole in a contact portion of the roller cleaning member with the roller.

According to a third aspect of the present invention, in the belt conveying apparatus of the second aspect, the porous material is a polyurethane foam.

In particular, in the belt conveying device according to the third aspect, by using foamed polyurethane as the roller cleaning member, it is possible to clean the foamed polyurethane by bringing the elastic surface of the polyurethane into contact with the roller. As a result, the roller surface can be cleaned more favorably without damaging the roller surface as compared with the case of using a material having a hard surface. In addition, foamed polyurethane,
Generally, it is cheap and easily available.

According to a fourth aspect of the present invention, in the belt transporting apparatus of the first aspect, a felt is used as the roller cleaning member.

In the belt conveying device according to the fourth aspect, by using felt obtained by compressing the fiber as the roller cleaning member, the flexible surface of the felt can be cleaned by contacting the roller with the roller. As a result, the roller surface can be cleaned more favorably without damaging the roller surface as compared with the case of using a material having a hard surface. Also, felt is generally cheap and readily available.

According to a fifth aspect of the present invention, there is provided a belt conveying device which is stretched over a plurality of rollers and carries a substance to be carried on a surface thereof, and conveys the substance to be carried on the surface thereof. A belt cleaning device having a belt cleaning means for cleaning a transport surface of the transport belt, wherein the roller has a resin film in contact with the surface of the roller facing the belt cleaning means from a counter direction, and cleans the roller surface. A cleaning means is provided.

According to a fifth aspect of the present invention, the resin film is brought into contact with at least the surface of the roller facing the belt cleaning means from the counter direction, among the plurality of rollers stretching the transport belt. In addition, foreign matter adhering to the surface of the roller is effectively removed for cleaning.

According to a sixth aspect of the present invention, there is provided a belt conveying device which is stretched over a plurality of rollers and carries a substance to be carried on a surface thereof, and conveys the substance to be carried on the surface thereof. A belt cleaning device for cleaning a conveying surface of the conveying belt, a roller cleaning device for cleaning a surface of a roller facing the belt cleaning device, and a roller cleaning device for removing a surface of the roller by the roller cleaning device. And a storage area for storing foreign matter.

In the belt conveying device of the present invention, the foreign matter removed from the roller surface by the roller cleaning means is stored in the storage area, and the substance adheres to the roller surface again or contaminates other members. Make sure there is nothing.

According to a seventh aspect of the present invention, there is provided a belt transporting device which is stretched over a plurality of rollers and carries a substance to be carried on its surface and transports the material, and faces the at least one of the rollers via the transporting belt. A belt cleaning device having a belt cleaning means for cleaning a conveyance surface of the conveyance belt, further comprising a roller cleaning member for movably contacting and cleaning the surface of the roller facing the belt cleaning means. A roller cleaning means is provided, and the roller to be cleaned by the roller cleaning means is subjected to a friction coefficient reduction process for reducing a surface friction coefficient.

In the belt conveying device of the present invention, the two members relatively move in a state where the roller cleaning member is in contact with the roller whose surface has a reduced friction coefficient after the friction coefficient reduction process is performed. Accordingly, the friction coefficient between the roller and the roller cleaning member is reduced as compared with a case where the friction coefficient reduction processing is not performed, and an increase in the driving load of the belt conveyance device can be suppressed. Further, as the friction coefficient of the roller surface is reduced, the foreign matter itself is less likely to adhere to the roller surface.

According to another aspect of the present invention, there is provided a belt conveying device which is stretched over a plurality of rollers and carries a substance to be carried on a surface thereof and conveys the material. A belt cleaning device configured to clean a conveyance surface of the conveyance belt, wherein the conveyance belt is configured to be replaceable with respect to the plurality of rollers; A roller cleaning member that contacts and cleans the surface, and a retracting unit that retracts the roller cleaning member to a position where the roller cleaning member does not contact the transport belt during the transfer operation of the transport belt. It is.

In the belt conveying device of the present invention, when the conveying belt is replaced for replacement or the like, the roller cleaning member is retracted to a position where the roller cleaning member does not contact the conveying belt by the retracting means. As a result, the roller cleaning member does not come into contact with or pierce the belt during the belt changing operation, so that the belt is not damaged or the belt is damaged.

In particular, the belt conveying device according to the ninth aspect is the belt conveying device according to the first, second, third, fourth, fifth, sixth, seventh, or eighth aspect, wherein the roller contacting the roller of the roller cleaning means or the roller The cleaning member has conductivity and is grounded.

In the belt conveying device according to the ninth aspect, since the roller cleaning means or the roller cleaning member which is in contact with the roller and cleans the roller is conductive and grounded, the roller is cleaned with the roller. The surface can be neutralized.

In particular, the image forming apparatus according to the present invention is an image forming apparatus comprising: a latent image forming means for forming a latent image; and a developing means for developing the latent image.
It has 2, 3, 4, 5, 6, 7, 8, or 9 belt conveying devices.

In a tenth aspect of the present invention, the belt conveying device used in the image forming apparatus is the belt conveying device of the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth aspect. . Thereby, the cleaning performance of the belt surface can be maintained. If the belt transport device is used, for example, a photoreceptor belt carrying an image on its surface, an intermediate transfer belt, and the like,
An image can be carried on a belt to which no foreign matter is attached. Further, for example, when the above-described belt transport device is used for a transfer belt that carries a transfer material such as transfer paper on the front surface, no stain adheres to the back surface of the transfer material.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a copying machine as an image forming apparatus will be described below.

FIG. 1 is a schematic configuration diagram of a copying machine according to the present embodiment. In this copying machine, a charging roller 20 as a charging device, an exposure device 30, and a developing device 4 are provided around a photoreceptor drum (hereinafter, referred to as a photoreceptor) 10 as an image carrier.
0, a transfer device 50, a photoconductor cleaning device 60, and a static elimination device 70 are provided.

The developing device 40 includes a developing sleeve 41 serving as a developer carrier which rotates by bringing an ear of a developer containing a toner and a carrier into contact with the surface of the photoreceptor 10, and a developing sleeve 41 for pumping and stirring the developer. And a developing paddle 42 that rotates.

The transfer / conveyance device 50 includes a driving roller 51
a transport belt 52 as a belt transport device which is stretched around the driven roller 51b and travels along a predetermined path, and a belt cleaning device 53 as a belt cleaning means for cleaning the surface of the transport belt 52.
The transfer paper sent from the pair of paper feed rollers 55 is carried on the surface of the transfer belt 52, and is conveyed to a transfer position which is a contact portion with the photoconductor 10, and the toner image on the photoconductor 10 is transferred to the transfer paper side. Is transferred to In order to remove foreign substances adhering to the surface of the transport belt 52 in preparation for the next transport of the transfer paper, a cleaning blade 53a as a belt cleaning device 53 is provided so as to be in contact with the surface of the transport belt 52.

The photosensitive member cleaning device 60 includes a blade 61 that contacts the surface of the photosensitive member 10 from the counter direction,
It has a stirring blade 62 that conveys foreign matter scraped from the surface of the photoreceptor 10 by the blade 61 to a collecting position, and a collecting screw 63 that collects foreign matter sent by the stirring blade 62, and performs transfer to transfer paper. The foreign matter remaining on the surface of the completed photoreceptor 10 is removed.

Next, the operation of the copying machine having the above configuration will be described. In FIG. 1, the photosensitive member 10 is uniformly charged by a charging roller 20 while being driven to rotate in the direction of the arrow, and then the reflected light from the original is image-formed and projected on an optical system (not shown) by an exposure device 30 on the photosensitive member 10. To form an electrostatic latent image. This electrostatic latent image is developed by the developing device 40 to form a toner image as a visible image. The thin developer layer on the developing sleeve 41 is separated from the developing sleeve 41 in a thin layer state by contact with the photoconductor 10 in the developing area, and the photoconductor 1
The process moves to a portion where the latent image on 0 is formed. The toner image developed by the developing device 40 is supplied to a pair of paper feed rollers 5.
5 and is collectively transferred onto the transfer paper at a contact portion (transfer position) with the transfer paper transported by the transport belt 52. Thereafter, the transfer paper onto which the toner image has been transferred is separated from the transport belt 52 by a separating device (not shown), and is discharged from the device after being subjected to a fixing process by a fixing device (not shown). On the other hand, the untransferred toner is collected and removed from the photoreceptor 10 after the transfer by the photoreceptor cleaning device 60, and the residual charge is removed by the discharging lamp 70 in preparation for the next charging.

Next, a description will be given of a feature of the present embodiment, which is a configuration capable of preventing the back surface of the transfer paper carried and conveyed on the conveyance belt 52 from being stained.

FIG. 2 is a schematic structural view of a transfer / conveying device 50 showing a characteristic portion of the present invention. In this figure, a roller cleaning device 80 for cleaning the surface of the driving roller 51a facing the cleaning position of the transport belt 52 by the cleaning blade 53a is provided. The roller cleaning device 80 includes a roller cleaning member 81a having a rectangular parallelepiped shape in surface contact with the surface of the drive roller 51a, and a roller cleaning member 81a.
And a holder 82 for holding. The holder 82
It has a U-shaped receiving tray shape, and foreign matter on the surface of the drive roller 51a scraped off by the roller cleaning member 81a falls into the holder 82 by gravity.
The holder 82 is attached to an arm 54 that is a holding member for the driving roller 51a. Further, the roller cleaning member 81a is provided at a contact portion with the drive roller 51a.
It has a number of gaps into which foreign matter removed from the roller surface can enter. Specifically, the roller cleaning member 81
A porous foamed polyurethane is used as a, and when one surface thereof contacts the drive roller 51a, a large number of holes serve as gaps through which foreign matter removed from the roller can enter. The foamed polyurethane holes used by the roller cleaning member 81a are very convenient for use as the roller cleaning member 81a because foreign matter on the surface of the roller 51a is convenient for entry.

In the above configuration, when the driving of the transfer conveying device 50 is started, the driving roller 51a rotates and the conveying belt 52 rotates. Then, the foreign matter such as dust and toner adhered to the surface of the transport belt 52 after the transfer paper has been transported is removed by the cleaning blade 53a in contact with the surface from the counter direction. At this time, the foreign matter that has entered the inner peripheral surface of the belt from the end of the transport belt 52 is initially attached to the inner peripheral surface of the belt, but the tension of the transport belt 52 to the driving roller 51a or the cleaning blade 53a causes Drive roller 5 gradually by pressure
1a Transfer to the surface side. The foreign matter once transferred and attached to the surface of the drive roller 51a tends to aggregate and grow on the surface of the drive roller 51a. However, in this embodiment,
Foreign matter adhering to the surface of the drive roller 51a can be scraped off by the roller cleaning member 81a before growth. The scraped foreign matter falls into the holder 82 of the roller cleaning member 81a and is collected. Therefore, the holder 82 also has a role as a storage area for storing foreign matter, and the drive roller 51
It is possible to prevent foreign substances from adhering to the surface a again, and it is not necessary to add a new storage member. In addition, foreign matter remaining between the surface of the driving roller 51a and the roller cleaning member 81a without being scraped off can be taken into many holes of the roller cleaning member 81a, and the roller cleaning member 81a and the driving roller 51a
There is no decrease in adhesion to the surface. Further, since the foamed polyurethane is an elastic material, the polyurethane comes into soft surface contact with the surface of the curved drive roller 51a. Accordingly, the surface of the drive roller 51a is brought into close contact with the surface of the drive roller 51a to exhibit good cleaning performance for a long time, and the surface of the drive roller 51a is not damaged.

Here, in the present embodiment, as the material that can be used for the roller cleaning member 81a, various materials other than the polyurethane foam can be considered. When a felt obtained by compressing the fibers is used, foreign matters enter the gaps between the fibers and the same cleaning performance as that of the polyurethane foam can be obtained. Further, since the felt has the flexibility like cloth, the felt comes into contact with the surface of the drive roller 51a more softly, and there is no possibility that the surface of the drive roller 51a is damaged.

The above-mentioned foamed polyurethane and felt are generally easily and inexpensively available, so that they are convenient for use as a cleaning member.

Next, a modified example of this embodiment will be described only for features different from those of the above embodiment. FIG.
5 is a schematic configuration diagram of a transfer / conveyance device 50 according to a modified example of the embodiment. This modification differs from the above-described embodiment in that a resin film 81b is used as the roller cleaning member 81a and is brought into contact with the drive roller 51a from the counter direction. Specifically, PET
A cleaning mylar 81b made of (polyethylene terephthalate) film is attached to one end of a U-shaped holder 82, and foreign matter on the surface of the drive roller 51a scraped off by the cleaning mylar 81b is applied to the holder 82 by gravity.
The holder 82 is provided in such a direction as to fall into the inside. As a result, the rollers 51 that stretch the transport belt 52
The foreign matter adhering to the surface of the driving roller 51a facing the cleaning blade 53a can be removed from the cleaning blade 53a.

The material that can be used for the resin film 81b is, for example, P
UR (polyurethane), POM (polyacetal), P
C (polycarbonate), PP (polypropylene), U
P (unsaturated polyester), PE (polyethylene) and the like are conceivable, but are not limited thereto. Since these resin films have low frictional resistance to aluminum generally used as the driving roller 51a, even if the resin film is brought into contact with the surface of the driving roller 51a from the counter direction, the resin film is turned together with the surface of the driving roller 51a to be turned. Therefore, good cleaning performance can be maintained for a long period of time.

In the above-described embodiment and the modification of the embodiment, as a friction coefficient lowering process for lowering the friction coefficient of the surface of the drive roller 51a, the drive roller 51a is used.
The surface is coated with Teflon. By performing such a friction coefficient lowering process, it is possible to prevent the driving load of the driving roller 51a from being increased due to the provision of the roller cleaning device 80. Also,
As a side effect of performing this processing,
Foreign matter can also be prevented from firmly adhering to the surface of the drive roller 51a.

FIG. 4 is an explanatory view at the time of the work of changing the conveyor belt 52. In the above embodiment and the modified example of the embodiment, the holder 8 of the roller cleaning member 81a is used.
2 is attached to the drive roller 51a.
And driven rollers 51 other than the arm 54
A belt frame 55 for holding the b is provided. The arm 54 is supported by a fulcrum O
It is attached so as to be rotatable around. In this configuration, when the transfer belt 52 is replaced for replacement or the like, the arm 54 is moved around the fulcrum O to the belt frame 5.
5 is rotated by approximately 140 degrees to bend, and the transfer belt 52 is lifted from the roller to perform a re-switching operation. Therefore, in the image forming apparatus of the present embodiment and its modification, the holder 82 of the roller cleaning device is fixed to the arm 54, and the roller cleaning device 80 is moved together with the drive roller 51 a by bending the arm 54, and is conveyed. It constitutes a means for retreating from the belt 52. Thus, when the transfer belt is changed, the roller cleaning member 81a may pierce the inner peripheral surface of the transfer belt 52, which may occur when the arm 54 is bent and moved but the roller cleaning member 81a does not move. Contact can be prevented. Thus, the operation of changing the transport belt 52 can be performed with confidence.

Here, in the configuration of FIG. 4, since the roller cleaning device 80 is held by the arm 54 supporting the drive roller 51a, when the arm 54 is moved, it is moved together with the drive roller 51a. It has become. However, a support member of the roller cleaning device 80 may be provided in addition to the arm 54, and the above-described retracting unit may be configured to be able to move relatively to the belt frame 55. With this configuration, the transport belt 52 can be prevented from being damaged in the same manner as described above, and can be moved independently of the drive roller 51a of the roller cleaning device 80.

The roller cleaning member 81a for cleaning the drive roller 51a may be formed of a conductive member and grounded. By doing so, the charge is removed as the surface of the drive roller 51a is cleaned, and foreign matter can be effectively removed.

In the above embodiment, the roller cleaning member 81 a is
However, the present invention is not limited to this. For example, the roller cleaning device as in the present embodiment is applied to various belt conveyance devices such as a case where a belt-shaped photoreceptor belt is used as an image carrier and a case where an intermediate transfer belt is used in a device having an intermediate transfer member. be able to.

[0049]

According to the belt conveying device of the first aspect, the contact state of the roller cleaning member with the roller is always kept good, and the cleaning performance of the roller cleaning member can be maintained. Among the rollers, the foreign matter adhering to at least the surface of the roller facing the belt cleaning means can be reliably removed. Thereby, the cleaning performance of the conveyor belt surface by the belt cleaning means can be maintained satisfactorily, and there is an excellent effect that the substance to be carried carried on the surface of the conveyor belt can be prevented from being stained.

According to the belt conveying device of the present invention, it is not necessary to provide a hole on the surface of the roller cleaning member which comes into contact with the roller, so that a roller cleaning member for maintaining the cleaning performance can be easily obtained. There is an excellent effect that can be.

According to the belt conveying device of the third aspect, by using foamed polyurethane for the roller cleaning member, excellent roller cleaning performance can be maintained, and the roller cleaning member is inexpensive and easily available. effective.

According to the belt conveying device of the fourth aspect, by using felt for the roller cleaning member,
While maintaining good cleaning performance,
There is an excellent effect that the roller cleaning member is inexpensive and easily available.

According to the belt transport device of the fifth aspect, of the rollers on which the transport belt is stretched, foreign matter adhered to at least the surface of the roller facing the belt cleaning means can be effectively removed. Therefore, the cleaning performance of the conveyor belt surface by the belt cleaning means can be maintained, and there is an excellent effect that contamination of the material to be carried carried on the belt surface can be prevented.

According to the belt conveying device of the present invention, the foreign matter once removed from the roller does not adhere to the roller surface again, so that the roller surface can be reliably maintained in a clean state. Therefore, there is an excellent effect that the cleaning performance of the conveyor belt surface by the belt cleaning means can be maintained, and the contamination of the substance carried on the belt surface can be prevented. In addition, there is also an excellent effect that it is possible to prevent the foreign matter once removed from contaminating members other than the tension roller of the transport belt.

According to the belt conveying device of the present invention, it is possible to suppress an increase in the driving load of the belt conveying device due to the relative movement of the roller cleaning member and the roller in contact with the roller. Adhered foreign substances can be stably removed. Therefore, there is an excellent effect that the cleaning performance of the conveyor belt surface by the belt cleaning means can be maintained satisfactorily, and the substance to be carried carried on the belt surface can be prevented from being stained. Also,
There is no occurrence of transport failure due to an increase in the driving load of the belt transport device due to the roller cleaning means.
In addition, since foreign matters are less likely to adhere to the roller surface, there is also an excellent effect that the surface of the roller can be easily maintained in a cleaner state.

According to the belt conveying device of the present invention, there is no possibility that the roller cleaning member may be damaged during the operation of changing the belt, so that the cleaning performance of the conveying belt is maintained and the amount of the material carried on the surface is reduced. There is an excellent effect that dirt and the like can be prevented. Further, since the roller cleaning member does not damage the transport belt, there is also an excellent effect that the maintainability of the transport belt is improved.

According to the belt conveying device of the ninth aspect, since the roller surface can be neutralized with the cleaning of the roller, an excellent effect that foreign substances on the roller surface can be effectively removed. There is.

According to the tenth aspect of the present invention, the cleaning performance of the conveyor belt can be maintained in the belt conveyor used in the image forming apparatus.
It is possible to prevent the contamination of the image carried on the conveyor belt and the stain on the back surface of the transfer material, thereby providing an excellent effect that a better image can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a copying machine according to an embodiment.

FIG. 2 is a schematic configuration diagram of a transfer conveyance device showing a characteristic portion of the embodiment.

FIG. 3 is a schematic configuration diagram of a transfer conveyance device according to a modification of the embodiment.

FIG. 4 is an explanatory view at the time of a work of changing a conveyor belt.

FIG. 5 is an explanatory view showing a conventional problem.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 photoconductor 20 charging roller 30 exposing device 40 developing device 41 developing sleeve 50 transfer / transport device 51 a drive roller 52 transport belt 53 belt cleaning device 53 a cleaning blade 54 arm 55 belt frame 60 photoconductor cleaning device 80 roller cleaning device 81 a roller cleaning member 82 Holder

Claims (10)

[Claims] A transport belt that is stretched over a plurality of rollers and carries a substance to be carried on the surface thereof and transports the transported material; and a transport surface of the transport belt facing at least one of the rollers via the transport belt. A belt cleaning device for cleaning, wherein a roller cleaning member for movably contacting the surface of the roller facing the belt cleaning device and cleaning the surface is provided; A belt conveying device, wherein a contact portion with the roller has a number of gaps into which foreign matter removed from the surface of the roller can enter. 2. The belt conveying device according to claim 1, wherein a porous material is used as said roller cleaning member. 3. The belt conveying device according to claim 2, wherein said porous material is polyurethane foam. 4. The belt conveying device according to claim 1, wherein a felt is used as the roller cleaning member. 5. A transport belt that is stretched over a plurality of rollers and carries a substance to be carried on its surface and transports the transported material. The transport belt faces the at least one of the rollers via the transport belt and faces the transport surface of the transport belt. A belt conveying device having a belt cleaning device for cleaning, wherein a roller film that has a resin film in contact with a surface of a roller facing the belt cleaning device from a counter direction and that cleans the roller surface is provided. Characteristic belt transport device. 6. A transport belt stretched over a plurality of rollers and carrying a substance to be carried on its surface and transporting the transported material, and a transport surface of the transport belt facing at least one of the rollers via the transport belt. A belt transport device having a belt cleaning unit for cleaning, a roller cleaning unit for cleaning a surface of a roller facing the belt cleaning unit, and a storage area for storing foreign matter removed from the roller surface by the roller cleaning unit. And a belt conveying device. 7. A transport belt stretched over a plurality of rollers and carrying a substance to be carried on its surface and transporting the transported material, and a transport surface of the transport belt facing at least one of the rollers via the transport belt. A belt cleaning device having a belt cleaning means for cleaning, wherein a roller cleaning means having a roller cleaning member for contacting the surface of the roller facing the belt cleaning means so as to be relatively movable and cleaning the surface is provided; A belt conveyance device, wherein a roller to be cleaned by a roller cleaning unit is subjected to a friction coefficient reduction process for reducing a surface friction coefficient. 8. A transport belt stretched over a plurality of rollers and supporting and transporting a substance to be loaded on a surface thereof, and a transport surface of the transport belt facing at least one of the rollers via the transport belt. A belt cleaning device for cleaning, wherein the transport belt is configured to be replaceable with respect to the plurality of rollers, wherein the belt contacts the surface of the roller facing the belt cleaning device, and And a retreating means for retreating the roller cleaning member to a position where the roller cleaning member does not come into contact with the transport belt when the transport belt is switched. 9. The belt conveying device according to claim 1, wherein a portion of said roller cleaning means in contact with a roller or said roller cleaning member has conductivity. A belt conveying device, which is grounded. 10. An image forming apparatus comprising: a latent image forming means for forming a latent image; and a developing means for developing the latent image, wherein: An image forming apparatus, comprising: