JP2008133136A - Conveying belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveying belt which is thin and has high flexibility and belt strength, making friction coefficient stable, generating no warp and inhibiting no conveyance. <P>SOLUTION: In the conveying belt 1 made of elastomer, including a transfer surface A and a drive surface B, short-length fibers 6 are provided on at least one of the surfaces of the transfer surface A and the drive surface B. The short-length fibers 6 are adhered by an electrostatic planting method, and core bodies 2 are embedded in the elastomer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thin conveyor belt that is preferably used for the purpose of reading and transporting banknotes, magnetic cards, coins, etc. in ATMs, automatic ticket gates, currency exchange machines, cash payment machines, and the like. The present invention relates to a conveyor belt that can prevent warping that is a peculiar problem, and that can stabilize the frictional force between the belt and a conveyed product and perform accurate and reliable conveyance.

  Thin belts such as flat belts and toothed belts are often used for transporting banknotes and cards in ATMs and other coin transport, automatic ticket gates, money changers, and the like. For example, as disclosed in Patent Document 1, these belts have a core wire embedded in a spiral shape in an elastomer material, and a canvas is laminated on the belt conveyance surface or drive surface to stabilize the friction coefficient of the surface, In order to prevent surface abrasion and cracks, and for use as a belt tension body, some have laminated canvas.

  Further, Patent Document 2 also includes a belt in which a conductive canvas is laminated on the upper layer of a belt made of an elastomer material to prevent the belt from being charged. Patent Document 3 discloses that belt constituent materials are arranged symmetrically with respect to the center in the thickness direction of the belt to prevent warping of the belt.

Japanese Utility Model Publication No. 62-204058 JP 2002-255324 A JP-A-8-99704

  In particular, the belts used for these conveyance applications are very thin. When the thin belt is constructed by laminating canvas on the surface as described above, the linear expansion coefficient is different between the elastomer material and the surface canvas, and there is a difference in the amount of thermal expansion and contraction due to temperature change. It is easy to generate warp. In particular, in a financial terminal that transports coins with a transport belt, a reverse roller is arranged on the transport belt with a gap of about one coin thickness so that only one coin can be transported. When the conveyor belt has a large warp, there is a problem that coins cannot pass.

  In Patent Document 3, the belt material is configured as an upper and lower object with the center in the belt thickness direction as a boundary, so that even if there is a difference in linear expansion coefficient between the respective materials, each cancels out and warp is not generated. For example, when a canvas is provided on the conveyance surface of the belt used for conveyance, the same canvas is disposed on the opposite surface for the purpose of preventing warpage, and the thickness of the belt is accordingly increased. It will increase.

  Such a belt is required to be able to be wound around a small-diameter pulley and run for a long time in order to make the entire apparatus compact, and is preferably thin and excellent in flexibility.

  Therefore, in the present invention, it is possible to wrap around a small-diameter pulley and have sufficient thickness and excellent flexibility, and also has the strength of the belt, can stabilize the friction coefficient, and suppress the generation of warpage. An object of the present invention is to provide a transport belt that can be transported and does not hinder transport.

  In order to achieve the above object, in claim 1 of the present invention, in a conveyor belt made of an elastomer and having a conveying surface and a driving surface, short fibers are arranged on at least one surface of the conveying surface and the driving surface. It is characterized by.

  According to a second aspect of the present invention, there is provided the conveying belt according to the first aspect, wherein short fibers are arranged on the surface of the elastomer forming the conveying surface and the driving surface.

  A third aspect of the present invention is the conveyance belt according to the second aspect, wherein the short fibers are obtained by electrostatically filing pile yarns.

Claim 4 is a conveyor belt of claim 1, wherein the short fibers per unit area of the surface provided with the short fibers is 16~48g / m ^2.

  A fifth aspect of the present invention is the conveying belt according to any one of the first to fourth aspects, wherein a core body is embedded in an elastomer constituting the belt.

  In claim 1, by arranging the short fibers on the surface of the belt, the surface can be protected, the crack can be prevented from being cracked, the friction coefficient of the belt surface is stabilized, and the conveying ability is kept constant. The drive can be stabilized, and the belt thickness can be made thin and the generation of warpage can be suppressed.

  In Claims 2 and 3, short fibers are arranged on the belt by flocking, and the short fibers can be attached relatively easily, and the adhesion strength of the short fibers is high, and even if the belt is run over a long period of time. Can be maintained.

According to the fourth aspect, since the amount of short fibers to be arranged is limited to 16 to 48 g / m ² , the effect of protecting the belt and adjusting the friction coefficient can be sufficiently obtained, and the belt is not too much. The surface friction coefficient can be stabilized.

  The details of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a conveyor belt according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

  In the conveyor belt 1 of the present invention, a core 2 is embedded in an adhesive rubber 3, and an extension rubber 4 is laminated on the adhesive rubber 3 to form a conveyance surface A. The driving surface B is formed by laminating the compression rubber 5.

  Here, as the material constituting the core 2 constituting the belt, ropes, woven fabrics or knitted fabrics made of organic fibers such as polyester fibers, polyamide fibers, aramid fibers, rayon fibers or inorganic fibers such as glass fibers and steel wires are used. Can be mentioned.

  The upper and lower adhesive rubber 3 and the stretch rubber 4 and the compression rubber 5 in which the core body is embedded are NR (natural rubber), SBR (styrene-butadiene rubber), CR (chloroprene rubber), H-NBR (hydrogenated). A single material such as nitrile rubber) or a rubber obtained by appropriately blending these materials or polyurethane.

  Further, in the present invention, the short fibers 6 are disposed on the surfaces A and B of the belt 1 without laminating the canvas, so that cracks are generated from the surfaces A and B of the belt and the belt is torn. Can be prevented, the friction coefficient of the belt surfaces A and B can be stabilized, and the belt can be kept thin so that the belt has excellent bending resistance, and the belt is also warped. Therefore, good transport performance can be obtained.

  Conventionally, for the purpose of protecting the belt 11 surface as described above and adjusting / stabilizing the friction coefficient, the canvas 12 as shown in FIGS. Further, since the coefficient of linear expansion is different from that of the elastomer material 13 such as adhesive rubber, stretchable rubber, and compressed rubber, there is a difference in thermal expansion / contraction amount due to temperature change, resulting in a problem that the belt 11 is warped. there were.

  In the present invention, the short fibers 6 are disposed instead of laminating the canvas. Even if there is a difference in linear expansion coefficient between the elastomer and the short fiber 6 made of the adhesive rubber 3, the stretch rubber 4, the compression rubber 5, etc., each of the short fibers 6 is independent of each other. Therefore, the occurrence of warping of the entire belt 1 can be prevented.

  Examples of a method for arranging the short fibers on the surfaces A and B of the conveying belt 1 include a method for flocking. While the short fiber 6 is implanted by providing an adhesive on the surface of the surface on which the short fiber 6 is arranged, the sleeve 7 of the unvulcanized rubber in the middle of manufacturing the belt 1 is attached to the mold. An adhesive is applied to the surface by a known method such as a spray method or a dip method.

  Adhesives include organic solvents that can melt rubber sheets such as toluene and methyl ethyl ketone, rubber adhesives, RFL (resorcin-formalin-latex) adhesives, urethane emulsions, acrylic emulsions, vinyl acetate emulsions, There are styrene emulsions. The RFL liquid is a mixture of an initial condensate of resorcin and formaldehyde mixed with latex. Examples of latex used here include chloroprene rubber, styrene / butadiene / vinylpyridine terpolymer, hydrogenated nitrile rubber, nitrile rubber, Ethylene / α-olefin-diene copolymer rubber latex. An isocyanate compound can also be added to the RFL solution. In addition, before apply | coating an adhesive agent, you may perform pre-processes, such as cleaning processes, such as alcohol wiping, and a primer process.

  Although the thickness of an adhesive agent is not specifically limited, In order to make the short fiber 6 favorable, it is about 0.05-1 mm, Preferably it is 0.05 mm-0.5 mm. Although it is preferable to have an adhesive, it is not always necessary to apply it.

  Subsequently, electrostatic flocking is performed on the surface of the rubber sleeve 7 using a known electrostatic flocking machine S as shown in FIG. As the flocking treatment, an electric field is formed by applying a voltage to the electrode of the electrostatic flocking machine S with the mold 8 as ground, and in this electric field, rayon, cotton, polyester, nylon, aramid, polyvinyl alcohol, carbon fiber, A pile of electrodeposited surfaces made of polytetrafluoroethylene or the like is supplied, blown, and planted by piercing toward the surface of the rubber sleeve 7. Dry the rubber sleeve after planting.

  In addition to the method of forming an adhesive layer on the surface of the rubber sheet as described above and attaching short fibers from the top, a method of forming a flocking layer by attaching an adhesive containing short fibers to the surface of the rubber sheet Can also be adopted. In that case, 5-50 with respect to 100 mass parts of adhesives, such as the said rubber adhesive, RFL (resorcinol-formalin-latex) adhesive, urethane type emulsion, acrylic type emulsion, vinyl acetate type emulsion, styrene type emulsion, etc. It is preferable to use a mixture of mass parts of short fibers.

The pile length is preferably about 0.1 to 5.0 mm, and the aspect ratio (length Lmm / thickness diameter Dmm) is preferably in the range of 30 to 300. Moreover, the density of the short fibers implanted is preferably in the range of 16 to 48 g / m ² . If it is less than 16 g / m ² , the effect of protecting the belt and preventing longitudinal tearing and the effect of adjusting the friction coefficient cannot be sufficiently obtained. If it exceeds 32 g / m ² , the density is too high and the bending rigidity is high. Since it becomes too much, it is not preferable.

  An unvulcanized rubber is vulcanized by appropriately attaching a jacket or the like to the implanted rubber sleeve 7 and heating and pressing. By doing so, the short fibers 6 planted are firmly attached in a state of being exposed on the surface of the rubber. By cutting the vulcanized rubber sleeve 7 to a predetermined width, a belt with short fibers attached to the surface can be obtained.

  Further, as shown in FIG. 4, an adhesive layer 9 is applied and formed on the surface of the rubber sleeve 7 by a coating apparatus T such as a spray method or a dip method, and the short fibers instead of electrostatic flocking are formed on the adhesive layer 9. A method of spraying the short fibers 6 with the spraying device U and attaching them to the adhesive layer 9 can also be adopted.

  By attaching the short fibers 6 to the rubber sleeve 7 of the mold 8 in the above manner, a rubber sleeve having a surface of the short fibers 6 formed on the surface as shown in FIG. 5 can be obtained.

  Further, when the rubber forming the stretch rubber 4 and the compression rubber 5 is not vulcanized, a short fiber is mixed to form a short fiber blended rubber, and the short fiber 6 is exposed on the rubber surfaces A and B by making a belt with the rubber. There is also a way to make it. In this case, examples of the short fiber to be mixed include cotton, polyamide, polyester, rayon, glass fiber, carbon fiber, and aramid fiber. The length of these short fibers is preferably in the range of 0.4 to 10 mm. If the length is less than 0.4 mm, the amount of exposure to the belt surface is insufficient, and effects such as wear resistance and crack resistance are sufficient. Therefore, the effect of adjusting the friction coefficient is small.

  On the other hand, the mixing amount of the short fibers 6 is preferably 5 to 40 parts by mass with respect to 100 parts by mass of the elastomer. When the amount is less than 5 parts by mass, the effects of wear resistance and crack resistance are reduced, and when it exceeds 40 parts by mass, the physical properties are deteriorated.

  Next, a comparative experiment was conducted by creating belts corresponding to an example of the present invention in which short fibers were adhered to the surface of the belt and a comparative example in which canvas was laminated and integrated on one side of a conventional belt.

(Example)
As an example, 20 mm in which 0.4 mm-long short fibers were attached to one side of a flat belt in which a core wire made of nylon was embedded in a spiral shape in a rubber composition mainly composed of chloroprene rubber by electrostatic flocking. A belt having a width of 1.0 mm was prepared. The density of the attached short fibers is 32 g / m ² . The finished belt was placed on a flat table with the concave surface down, and the maximum height lifted by the warp was measured as the amount of warp. The results are shown in Table 1.

(Comparative example)
As a comparative example, a belt having a width of 20 mm and a thickness of 1.0 mm was prepared by laminating and integrating a nylon canvas on one side of a flat belt made of chloroprene rubber and embedded with a nylon core wire in a spiral manner as in the example. The finished belt was placed on a flat table with the concave surface down, and the maximum height lifted by the warp was measured as the amount of warp. The results are shown in Table 1.

  As can be seen from the results in Table 1, in the comparative belt in which a canvas is laminated on one side of a flat belt, a large warp of 3.00 mm is generated, but an example in which short fibers are attached instead of the canvas. Then, although the generation | occurrence | production of the warp was seen, the amount of warp was only 0.85 mm and the warp was small, and the effect of this invention was confirmed.

  For example, it can be effectively used as a conveyor belt used for paying out coins in a financial terminal such as ATM.

It is a perspective sectional view of the conveyance belt of the present invention. It is sectional drawing of the belt for conveyance of this invention. It is a front view of the place where electrostatic flocking is carried out. It is a front view of the place which has sprayed the short fiber. It is a side view of the rubber sleeve which adhered the short fiber. It is a perspective sectional view of a conventional conveyor belt. It is sectional drawing of the conventional conveyance belt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt for conveyance 2 Core wire 3 Adhesive rubber 4 Stretch rubber 5 Compression rubber 6 Short fiber 7 Inner type 8 Belt sleeve 9 Adhesion layer S Electrostatic flocking machine T Coating device U Short fiber dispersion device 11 Conveyance belt 12 Canvas 13 Elastomer

Claims (5)

  A conveying belt made of an elastomer and having a conveying surface and a driving surface, wherein a short fiber is disposed on at least one surface of the conveying surface and the driving surface.   The conveying belt according to claim 1, wherein an adhesive layer is provided on at least one of the conveying surface and the driving surface, and short fibers are attached to the adhesive layer and are arranged by flocking.   The conveyor belt according to claim 2, wherein the short fibers are obtained by electrostatically filing pile yarns. The conveyance belt according to claim 1, wherein the amount of short fibers per unit area of the surface provided with the short fibers is 16 to 48 g / m ² .   The conveyor belt according to claim 1, wherein a core is embedded in an elastomer constituting the belt.

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