JP4822839B2 - Transfer conveyor belt and manufacturing method thereof - Google Patents

Description

  The present invention relates to a transfer conveyance belt and a manufacturing method thereof. More specifically, the present invention relates to a transfer / conveying belt in which highly accurate ribs are stably bonded to an inner peripheral surface, and a transfer / conveying belt manufacturing method capable of easily and economically manufacturing the belt.

In many image forming apparatuses such as copying machines and printers using an electrophotographic system, a multicolor toner image on an image carrier is transferred to an endless transfer conveyance belt, and the toner image is conveyed to record on a sheet or the like. A mechanism for secondary transfer to the medium is employed. FIG. 4 is a schematic diagram of an example of an image forming apparatus. Around the photosensitive drum 4 as an image carrier, a charger 5, a laser exposure device 6, a rotary developing device 7, a transfer conveyance belt 8, and a drum cleaner 9 are arranged in this order. The photosensitive drum is rotationally driven in the direction of the arrow, and is uniformly charged by a charger, then exposed to a laser beam L from an exposure device to form a latent image, and developed and visualized with yellow toner by a developer Y. The The yellow toner image formed on the photosensitive drum is primarily transferred onto the surface of the transfer conveyance belt. The transfer conveyance belt is stretched around the driving roller 10, the secondary transfer counter roller 11, and the tension roller 12, and is driven by the driving roller at a speed equal to the surface speed of the photosensitive drum. The surface of the photosensitive drum is cleaned by a drum cleaner, and one cycle is completed.
Then, charging of the photosensitive drum with a charger, exposure with a laser beam, development with cyan toner in the developing unit C, transfer of a toner image to a transfer conveyance belt, and cleaning of the surface of the photosensitive drum are performed. Then, a magenta toner image transfer and a black toner image transfer cycle are performed. The toner images of yellow, cyan, magenta, and black are superimposed and transferred, and the color toner image formed on the transfer conveyance belt by superimposing unfixed four color toners is a secondary transfer counter roller and a secondary transfer roller 13. 2 is secondarily transferred to the recording medium P. The recording medium onto which the toner image has been secondarily transferred is sent to the fixing device 14 where it is heated and pressurized to fix the toner image and the image formation is completed.
In such a color image forming apparatus using a transfer / conveyance belt, the superimposed toner images that have been multiplex-transferred on the transfer / conveyance belt are collectively transferred to a recording medium, so that each color toner is directly transferred from the latent image carrier to the recording medium. Compared to the method of sequentially transferring images, it is possible to effectively prevent positional deviation between toner images and image disturbance. However, an endless belt such as a transfer / conveying belt may cause a meandering phenomenon in which the axis of the driving roller and the driven roller are not parallel to each other, and the direction is perpendicular to the traveling direction. When the transfer / conveying belt meanders, a deviation occurs between the toner images of the respective colors, the image is disturbed, and the image quality is deteriorated.
In order to prevent meandering of the transfer / conveyance belt, ribs are provided on the entire circumference of the transfer / conveyance belt. FIG. 5 is an explanatory diagram of an example of a rib (Patent Document 1). In this example, guide ribs 16 are provided on both side edges of the inner peripheral surface of the transfer conveyance belt 15, and end pressing members 18 disposed at both ends of the cleaning blade 17 are arranged between the guide rib and the tension roller 19 at both ends of the transfer conveyance belt. Since it is disposed at a position straddling the flange 20, the guide rib is prevented from climbing onto the flange, and the meandering of the transfer / conveyance belt is reliably prevented. FIG. 6 is an explanatory diagram of another example of the rib (Patent Document 2). In this example, ribs 22 are attached to both side edges of the transfer conveyance belt 21, and rib guides 24 configured to be independently rotatable with respect to the driving roller are provided on both side ends of the driving roller 23. Generation of distortion of the transfer / conveyance belt is prevented by cutting off the force that drives the transfer / conveyance belt via the ribs.
However, the work of attaching the elongated rib material to the inner peripheral surface of the transfer / conveying belt with high accuracy is troublesome and not easy. In the joint of the rib material, if the upstream rib material is displaced to the inner side of the transfer conveyance belt than the downstream rib material, for example, in the example shown in FIG. 6, the rib guide is the joint of the rib material. Riding on the upstream rib material not only deforms the transfer conveyance belt, but also causes the rib material to peel off from the joint. For this reason, an apparatus in which the rib material joints are positively shifted has been proposed. FIG. 7 is an explanatory diagram of this example (Patent Document 3). The arrows in the figure indicate the traveling direction of the transfer conveyance belt. In this example, ribs 26 are bonded and fixed to both end portions of the inner peripheral surface of the transfer / conveying belt 25, and at the joint 27, the upstream rib end 28 is more delicately transferred and conveyed than the downstream rib end 29. It is offset and bonded to the outside of the belt. However, it is not easy to accurately bond the both ends of the rib material to a delicate positional relationship, and the gap between the ribs is widened even if it is a little, because there is room for the transfer conveyance belt to meander. It is not preferable.
A large lateral force is applied to the ribs of the transfer / conveyance belt from the guide portion of the roller in order to suppress the meandering of the transfer / conveyance belt. Since the bonding area between the rib material and the inner peripheral surface of the transfer / conveying belt is not large, a transfer / conveying belt in which the belt main body and the rib material are stitched together is proposed as a means to withstand the large force received from the guide portion . FIG. 8 is an explanatory diagram of this example (Patent Document 4). In this example, the belt main body, the reinforcing tape 31, and the rib material 32 of the transfer / conveying belt 30 are sewn together by a thread 33. However, the process of sewing the belt main body and the rib material with the thread is extremely complicated, and it is not easy to sew uniformly over the entire circumference so as not to cause distortion.
JP 2002-132057 A (page 8, FIG. 10) Japanese Patent Laying-Open No. 2004-4927 (page 6-7, FIG. 1) Japanese Patent Laid-Open No. 11-20975 (second page, FIG. 2) JP-A-9-175686 (page 3, FIG. 1)

  SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer / convey belt in which a highly accurate rib is stably bonded to an inner peripheral surface, and a transfer / convey belt manufacturing method capable of easily and economically manufacturing the belt. It is a thing.

As a result of intensive research to solve the above problems, the present inventor has a seamless annular shape having an outer periphery larger than the inner periphery of the transfer conveyance belt inside the side end of the transfer conveyance belt or in the vicinity thereof. By adhering the ribs, the rib is pressed against the belt by the expansion force of the annular rib itself, and the transfer conveyance belt rotates smoothly because there is no joint between the annular ribs. It has been found that an image having a quality can be obtained, and the present invention has been completed based on this finding.
That is, the present invention
(1) In a transfer conveyance belt to which a toner image on an image carrier is transferred and secondarily transfers a formed multicolor toner image to a recording medium, an annular rib is formed on the side end of the belt or inside the vicinity thereof. And the outer circumference of the annular rib before adhering to the transfer / conveyance belt is 1.000 to 1.05 times the inner circumference of the transfer / conveyance belt at 25 ° C. Transfer conveying belt, and
(2) A method of manufacturing a transfer / conveying belt in which a toner image on an image carrier is transferred, and a formed multicolor toner image is secondarily transferred to a recording medium. An annular rib whose outer periphery at 25 ° C. is 1.000 to 1.05 times the inner periphery of the rubber tube at 25 ° C. is bonded to the inner side in the vicinity thereof. ,
Is to provide.
Furthermore, as a preferred embodiment of the present invention,
(3) The transfer conveyance belt according to (1), wherein the outer circumference of the annular rib is 1.01 to 1.04 times the inner circumference of the transfer conveyance belt;
(4) The transfer conveyance belt according to (1), wherein the outer periphery of the annular rib is 50 to 250 mm,
(5) The manufacturing method of the transfer conveyance belt according to (2), wherein the outer periphery of the annular rib is 1.01 to 1.04 times the inner periphery of the rubber tube;
(6) The method for producing a transfer conveyance belt according to (2), wherein the outer periphery of the annular rib is 50 to 250 mm,
Can be mentioned.

In the transfer conveyance belt of the present invention, the rib material that suppresses the meandering of the belt is pressed against the inner periphery of the transfer conveyance belt by its expansion force, so that the belt and the rib material maintain a stable adhesive state, Does not come off the belt. In addition, since there are no joints in the annular rib material, the joints do not give inhomogeneity to the rotational movement of the transfer conveyance belt, and the transfer conveyance belt rotates smoothly to form an image with high image quality. can do.
According to the method for manufacturing the transfer / conveying belt of the present invention, the annular rib is bonded in a state where the rib is pressed against the rubber tube from the inside of the rubber tube, so that it can be bonded stably.

The transfer / conveying belt of the present invention is a transfer / conveying belt to which a toner image on an image bearing member is transferred and secondarily transfers a formed multicolor toner image to a recording medium. An annular rib is bonded, and the outer circumference of the annular rib is a transfer conveyance belt having a diameter of 1.000 to 1.05 times the inner circumference of the belt at 25 ° C.
FIG. 1 is a cross-sectional view showing an embodiment of the transfer / conveying belt according to the present invention, in a state in which the outer peripheral surface of the belt is cylindrical and cut along a plane passing through the central axis of the cylinder. FIG. 2 is a side view of one embodiment of the transfer / conveying belt according to the present invention viewed in the direction of the central axis of the cylinder in a state where the outer peripheral surface of the belt is cylindrical. In the transfer conveyance belt of the embodiment shown in FIGS. 1 and 2, annular ribs 2 having a rectangular cross section cut along a plane passing through the central axis are bonded to both ends of the transfer conveyance belt 1.
FIG. 3 is a cross-sectional view showing another embodiment of the transfer / conveying belt according to the present invention, in a state in which the outer peripheral surface of the belt is cylindrical and cut along a plane passing through the central axis of the cylinder. In the transfer conveyance belt of the mode shown in FIG. 3, annular ribs 3 are bonded to the inner side in the vicinity of both side ends of the transfer conveyance belt 1. 1, 2, and 3, the transfer conveyance belt is shown in a state where the outer peripheral surface is cylindrical, and the cross-sectional shape cut by a plane perpendicular to the central axis of the cylinder is circular, but transfer is performed in the image forming apparatus. When a conveyor belt is used, the transfer conveyor belt is stretched around a plurality of rollers such as a drive roller, a secondary transfer opposing roller, and a tension roller. It becomes a certain polygon.

  In the transfer conveyance belt of the present invention, the outer circumference of the annular rib is 1.00 to 1.05 times, more preferably 1.01 to 1.04 times the inner circumference of the transfer conveyance belt at 25 ° C. More preferably, it is 1.02 to 1.03 times. The outer circumference of the annular rib and the inner circumference of the transfer / conveying belt are values measured at 25 ° C. in a tensionless state in which the cross section is circular. The bonding process between the transfer conveyance belt and the rib is performed at room temperature, and the internal temperature of the image forming apparatus using the completed transfer conveyance belt is usually 40 to 60 ° C. By comparing the circumferences, it is possible to manufacture and use a transfer / conveying belt having no practical problem. When the outer circumference of the annular rib is less than 1.00 times the inner circumference of the transfer conveyance belt, tension acts in the circumferential direction of the annular rib, and the annular rib is stably bonded to the transfer conveyance belt. May become difficult. If the outer circumference of the annular rib exceeds 1.05 times the inner circumference of the transfer / conveying belt, the annular rib may be twisted and it may be difficult to adhere to the transfer / conveying belt in a stable circular state. There is. Even if the outer circumference of the annular rib is 1.00 times the inner circumference of the transfer conveyance belt, an adhesive layer is formed between the annular rib and the transfer conveyance belt. Although the spreading force works, in order to obtain a more stable adhesion state, it is preferable that the outer periphery of the annular rib exceeds 1.00 times the inner periphery of the transfer conveyance belt.

  There are no particular limitations on the material of the rubber tube and the annular rib forming the transfer / conveying belt of the present invention. For example, styrene-butadiene rubber (SBR), butadiene rubber (BR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene-diene rubber (EPDM), butyl rubber (IIR), acrylic rubber (ANM), chlorosulfonated polyethylene rubber (CSM), silicone rubber, fluorine rubber, polysulfide rubber, natural rubber, etc. it can. These materials can be used individually by 1 type, or can also be used in combination of 2 or more type. Among these, a mixture of chloroprene rubber (CR) and ethylene-propylene-diene rubber (EPDM) can be suitably used because both flame retardancy and ozone resistance can be achieved depending on the blending ratio. The mixing ratio of chloroprene rubber (CR) and ethylene-propylene-diene rubber (EPDM) is preferably 60/40 to 90/10 (weight ratio). In the present invention, the means for adhering the annular rib and the transfer / conveying belt is not particularly limited, but a rubber adhesive similar to the annular rib and the transfer / conveying belt can be suitably used.

In the transfer conveyance belt of the present invention, the outer periphery of the annular rib is preferably 50 to 250 mm, and more preferably 80 to 180 mm. A transfer / conveying belt having an annular rib with an outer periphery of less than 50 mm may have poor practicality as a part of an image forming apparatus. If the outer periphery of the annular rib exceeds 250 mm, it may be difficult to bond the transfer / conveying belt while maintaining uniformity without distortion. In the transfer conveyance belt of the present invention, the width of the annular rib is preferably 3 to 10 mm, and more preferably 4 to 7 mm. If the width of the annular rib is less than 3 mm, the strength of the rib itself and the adhesive strength between the rib and the belt may be insufficient. If the width of the annular rib exceeds 10 mm, it may be difficult to smoothly rotate and transfer as the transfer conveyance belt. In the transfer conveyance belt of the present invention, the thickness of the annular rib is preferably 0.5 to 2 mm, and more preferably 0.7 to 1.5 mm. If the thickness of the annular rib is less than 0.5 mm, it may be difficult to prevent movement of the rib by the guide portion. If the thickness of the annular rib exceeds 2 mm, smooth rotation as the transfer / conveying belt may be difficult.
In the transfer / conveying belt of the present invention, the width of the belt is not particularly limited, and can be appropriately selected according to the dimensions of the image forming apparatus and the recording medium. For example, when A4 or A3 size paper is used as the recording medium, the width of the belt is preferably about 310 mm. In the transfer / conveying belt of the present invention, the thickness of the belt is not particularly limited, but is preferably 0.40 to 0.60 mm, and more preferably 0.45 to 0.50 mm. If the thickness of the belt is less than 0.40 mm, the strength of the belt may be insufficient due to thinness. If the thickness of the belt exceeds 0.60 mm, the unit to which the belt is attached may be damaged.

In the method for producing a transfer / conveying belt according to the present invention, a toner image on an image carrier is transferred, and a method for producing a transfer / conveying belt in which a formed multicolor toner image is secondarily transferred to a recording medium. An annular rib whose outer periphery at 25 ° C. is 1.00 to 1.05 times the inner periphery of the rubber tube at 25 ° C. is adhered to the side end of the transfer / conveying belt made of
There are no particular restrictions on the method for producing the rubber tube used in the present invention. For example, after blending and kneading a filler, plasticizer, softener, etc. with rubber, sulfur, a vulcanization accelerator, etc. are further added. They can be kneaded and extruded into a tube having a predetermined inner circumference and thickness using an extruder. The obtained rubber tube is cut into a predetermined length to be used as a raw material for the transfer conveyance belt. There are no particular restrictions on the method for producing the annular rib used in the present invention. For example, after adding a filler, a plasticizer, a softening agent, etc. to rubber, kneading, and further adding sulfur, a vulcanization accelerator, etc. Then, an annular rib having a predetermined outer periphery and a cross-sectional shape such as width and thickness can be obtained by injection molding. In the method of the present invention, the rubber component constituting the rubber tube and the rubber component constituting the annular rib are preferably the same kind of rubber component.

In the method of the present invention, a foldable columnar mold can be inserted into a rubber tube cut to a predetermined length, leaving the side end and the vicinity thereof, and the cylindrical shape can be maintained. It is preferable to grind the part which adheres the annular rib on the inner surface of the rubber tube that is out of the cylindrical mold. Similarly, the annular rib is preferably polished on one side, on both sides, or on the outer peripheral surface bonded to the belt. An adhesive in which rubber is dissolved in an organic solvent can be applied to the inner surface of the rubber tube to which the annular rib is bonded. The rubber component constituting the adhesive is preferably the same rubber component as the rubber component constituting the rubber tube and the annular rib.
Subsequently, an annular rib can be pushed in and bonded to the place where the adhesive of the rubber tube is applied. Since the outer periphery of the annular rib is 1.00 to 1.05 times the inner periphery of the rubber tube, it is preferable to push the annular rib into the rubber tube using rubber elasticity. Although the ring-shaped rib immediately after being pushed in remains distorted, the ring-shaped rib is pushed in and the stress is evenly distributed while waiting for the adhesive to dry. It will be in the state without the distortion which presses a rubber tube by expansion force. When the adhesive dries and the annular rib adheres to the inner peripheral surface of the rubber tube, the cylindrical mold is folded and taken out to complete the transfer conveyance belt. In the present invention, the T-shaped peel strength of the annular rib and the rubber tube measured according to JIS K 6256 is preferably 0.1 N / mm or more, more preferably 0.2 N / mm or more. preferable. If the T-type peel strength is less than 0.1 N / mm, the annular rib may be peeled off from the transfer conveyance belt during use of the transfer conveyance belt.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
Example 1
Chloroprene rubber (CR) [Showa Denko Elastomer Co., Ltd., Showrene WRT] 73 parts by weight, ethylene-propylene-diene rubber (EPDM) [Sumitomo Chemical Co., Ltd., Esprene 505] 27 parts by weight, zinc oxide [Bayer, Renogran ZnO -80] 6 parts by weight, magnesium oxide [Kyowa Chemical Industry Co., Ltd., Kyowa Mag 150] 4 parts by weight, carbon black [Electrochemical Industry Co., Ltd., Denka Black] 50 parts by weight, process oil [Idemitsu Kosan Co., Ltd.] 10 parts by weight of PW-380] and stearic acid [Kao Corporation, Lunac S-40] were kneaded with a kneader, cooled, and then sulfur (Bayer, Renogran S-80) 1 part by weight with an open roll, ethylenethiourea [ Kawaguchi Chemical Co., Ltd., Accelerator 22] 1 part by weight and tetramethylthiuram disulfide [Ouchi Shinsei Chemical Co., Ltd. , Noxeller TT] 0.5 parts by weight was added, kneaded, and ribbon-shaped and supplied to the extruder.
A bent die extruder with a screw diameter of 75 mm is equipped with a tubing die, extruded at a cylinder temperature of 60 ° C., a head temperature of 80 ° C., and a die temperature of 90 ° C., and measured at 25 ° C. for an inner circumference of 114.6 mm and a thickness. A 0.7 mm rubber tube was obtained. This rubber tube was cut into a length of 370 mm to obtain a raw material for the transfer conveyance belt.
The same CR / EPDM rubber compounding composition as that used for extrusion molding was press-molded at a mold temperature of 150 ° C. for 20 minutes using a compression molding machine, and the outer circumference measured at 25 ° C. was 117.5 mm and the width was 5. An annular rib having a thickness of 0 mm and a thickness of 1.1 mm was obtained.
A cylindrical tube with a foldable diameter of 114.0 mm and a length of 290 mm is inserted into a rubber tube cut into a length of 310 mm, leaving 10 mm at both ends of the tube, and the rubber tube is formed into a cylindrical shape. The inner peripheral surface of the part was polished using a ruter. The outer peripheral surface of the annular rib was similarly polished using a cylindrical polishing machine. A water-based rubber adhesive was applied to each inner peripheral surface of 5.0 mm from both ends of the rubber tube, and an annular rib was pushed in. The adhesive was dried by allowing it to stand at room temperature for 16 hours, and then the cylindrical mold was folded and taken out to complete a transfer conveyance belt. The T-type peel strength of the annular rib and the rubber tube measured according to JIS K 6256 was 0.28 N / mm.

In the transfer conveyance belt of the present invention, the rib material that suppresses the meandering of the belt is pressed against the inner periphery of the transfer conveyance belt by its expansion force, so that the belt and the rib material maintain a stable adhesive state, Does not come off the belt. In addition, since there are no joints in the annular rib material, the joints do not give inhomogeneity to the rotational movement of the transfer conveyance belt, and the transfer conveyance belt rotates smoothly to form an image with high image quality. can do.
According to the method for manufacturing the transfer / conveying belt of the present invention, the annular rib is bonded in a state where the rib is pressed against the rubber tube from the inside of the rubber tube, so that it can be bonded stably. According to the method of the present invention, it is possible to manufacture a transfer / conveying belt that can be applied to a high-speed image forming apparatus such as 100 sheets / minute without using an expensive material such as polyimide resin.

It is sectional drawing of the one aspect | mode of the transfer conveyance belt of this invention. It is a side view of one mode of a transfer conveyance belt of the present invention. It is sectional drawing of the other aspect of the transfer conveyance belt of this invention. 1 is a schematic diagram of an example of an image forming apparatus. It is explanatory drawing of an example of a rib. It is explanatory drawing of the other example of a rib. It is explanatory drawing of the other example of a rib. It is explanatory drawing of the other example of a rib.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer conveyance belt 2 Ring-shaped rib 3 Ring-shaped rib 4 Photosensitive drum 5 Charger 6 Laser exposure apparatus 7 Rotating developing apparatus 8 Transfer conveyance belt 9 Drum cleaner 10 Drive roller 11 Secondary transfer counter roller 12 Tension roller 13 Secondary Transfer roller 14 Fixing device 15 Transfer conveyance belt 16 Guide rib 17 Cleaning blade 18 End pressing member 19 Tension roller 20 Flange 21 Transfer conveyance belt 22 Rib 23 Drive roller 24 Rib guide 25 Transfer conveyance belt 26 Rib 27 Joint 28 Upstream rib end 29 Rib end on downstream side 30 Transfer conveyance belt 31 Reinforcement tape 32 Rib material 33 Yarn

Claims (2)

In a transfer conveyance belt to which a toner image on an image carrier is transferred and secondarily transfers a formed multicolor toner image to a recording medium, an annular rib is bonded to the side end of the belt or in the vicinity thereof. And the outer circumference of the annular rib before adhering to the transfer / conveyance belt is 1.000 to 1.05 times the inner circumference of the transfer / conveyance belt at 25 ° C. . A method of manufacturing a transfer / conveying belt in which a toner image on an image carrier is transferred, and a formed multicolor toner image is secondarily transferred to a recording medium. A manufacturing method of a transfer conveyance belt, wherein an annular rib whose outer periphery at 25 ° C. is 1.00 to 1.05 times the inner periphery of the rubber tube at 25 ° C. is bonded to the inside.

Images