JP2007062938A - Conveying flat belt having projection, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the durability of a projection by allowing the projection to be easily deformed. <P>SOLUTION: A conveying flat belt 10 has a belt body 20 formed in an endless shape. The belt body 20 is constituted of a rubber layer 21 and a canvas 22 forming a core of the flat belt 10 which is laminated on the outer circumferential side of the rubber layer 21. A plurality of projections 11 are provided on an outer circumferential surface 20A of the belt body. A plurality of recesses 13 are formed at the positions corresponding to the projections 11 on an inner circumferential surface 20B of the belt body 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a belt with protrusions, and more particularly to a flat belt used in conveyance applications.

  2. Description of the Related Art Conventionally, a conveying flat belt has been widely used to convey a conveyed item such as a coin in a money handling machine such as an automatic change machine. The transport flat belt may be provided with a protrusion for transporting the transported object. In this case, the transport flat belt is rotated and the transported object is transported while the transported object is locked to the protrusion.

It is known that the protrusions on the conveying belt are formed by being attached to the conveying surface with an adhesive, for example. In addition, it is known that protrusions are formed on one surface of a belt by vulcanizing and forming a flat conveyor belt using a mold provided with grooves for forming protrusions (for example, Patent Documents). 1).
JP 10-156961 A

  In the transport flat belt, as described above, the transported object is transported by rotating the belt while the transported object is locked to the protrusion, so that a load along the belt transport surface is applied from the transported object to the protrusion. The Further, when the transported object is caught by an obstacle, for example, a large load may be applied to the protrusion from the transported object. However, the protrusions on the conveying flat belt are fixed to the belt body and cannot be greatly deformed or displaced even when the above-described load is applied. Therefore, since the load acting on the protrusion is concentrated on the joint portion between the protrusion and the belt, cracks are generated in the portion, and there is a problem that the protrusion easily peels from the belt body.

  Accordingly, the present invention has been made in view of such problems, and an object of the present invention is to provide a transporting flat belt that makes it easy to deform or displace the protrusions and that the protrusions are difficult to peel off from the belt.

  The transporting flat belt with protrusions according to the present invention is a transporting flat belt provided with a protrusion on one surface of the belt body, and the belt body has a hollow portion formed on the back side of the protrusion. Features. According to such a configuration, when a load is applied to the protrusion, the protrusion sinks into the hollow portion, and the load applied to the protrusion does not concentrate on the joint portion with the belt body, so the durability of the protrusion Can be improved.

  On the other surface of the belt body, for example, a recess is provided at a position corresponding to the protrusion, and the hollow portion is the recess. Moreover, the hollow part may be obstruct | occluded.

  For example, the protrusions are provided discontinuously in the width direction of one surface. Further, the protrusions are provided discontinuously in the longitudinal direction of one surface, for example. Furthermore, a plurality of protrusions may be arranged in at least one of the longitudinal direction and the width direction of the belt.

  A method for manufacturing a conveying flat belt according to the present invention includes forming a protrusion on one surface of a belt body and pressing the one surface against a base, thereby a part of the other surface of the belt body corresponding to the protrusion. And a concave portion is formed on the other surface by polishing a part of the bulge. According to such a manufacturing method, the concave portion can be easily formed at the corresponding position of the protrusion.

  The base is a columnar body, and the belt main body is preferably formed endlessly, wound around the columnar body, and one surface is pressed against the columnar body.

  In the belt with protrusions according to the present invention, even when a load is applied to the protrusion, the protrusion sinks into the hollow portion, and the load is not concentrated on the joint portion between the belt and the protrusion. Accordingly, the protrusions are difficult to peel off from the belt, and thereby the life of the protrusion-equipped conveying belt can be extended.

  FIG. 1 is a perspective view showing a usage state of the conveying flat belt according to the present embodiment. FIG. 2 is a longitudinal sectional view of the conveying flat belt on the line II-II in FIG. The transport flat belt 10 according to the present embodiment includes a belt main body 20, and the belt main body 20 includes a rubber layer 21, a canvas 22 serving as a core body of the transport flat belt 10 on the outer peripheral side of the rubber layer 21. Are stacked.

  The belt main body 20 is formed in an endless shape, and protrudes vertically from the outer peripheral surface 20 </ b> A, and is provided with a protrusion 11 that is molded integrally with the belt main body 20. The protrusion 11 is provided at a part of the outer peripheral surface 20A in the width direction and at a part of the outer peripheral surface 20A in the longitudinal direction, that is, the protrusion 11 is provided discontinuously in the width direction and the longitudinal direction of the belt. Specifically, in the present embodiment, a plurality of protrusions 11 are arranged at equal intervals in the width direction, and a plurality (for example, eight) of protrusions 11 are also arranged at equal intervals in the longitudinal direction.

  A plurality of recesses 13 are formed on the inner peripheral surface 20 </ b> B of the belt body 20. The cross-sectional shapes (cross-sections along the conveying surface) of each protrusion 11 and each concave portion 13 are substantially the same shape and present a rectangle that is long in the width direction. And these rectangles are the substantially same magnitude | size, or the recessed part 13 is slightly large. The recesses 13 are provided at positions corresponding to the protrusions 11, that is, a hollow portion is provided by the recesses 13 on the back side of each protrusion 11 in the belt body 20.

  The canvas 22 is made of nylon fiber, aramid fiber, polyester fiber, glass fiber, cotton yarn, or a mixed fiber of two or more of these. The canvas 22 is a woven fabric formed by weaving the above fibers, for example, in an endless manner, or a knitted fabric formed by knitting.

  The rubber layer 21 and each protrusion 11 are formed from an elastomer which is an elastic material. Examples of the elastomer component include ethylene-propylene-diene terpolymer blend (EPDM), ethylene-propylene rubber (EPR), hydrogen Nitrile rubber, hydrogenated nitrile rubber added with unsaturated carboxylic acid metal salt, chlorosulfonated polyethylene, chlorinated polyethylene, chloroprene, urethane rubber (eg millable urethane), epichlorohydrin rubber, acrylic rubber, fluororubber, silicone rubber Or a mixture of two or more of these.

  Next, the operation of the conveying flat belt 10 according to this embodiment will be described. The conveying flat belt 10 is used by being wound around two pulleys P so that the conveying surface of the outer peripheral surface 20A is inclined to the upper left in FIG. On the outer peripheral surface of the conveying flat belt 10, the conveyed product C (for example, a coin) is locked to the left side in FIG. 1 of the two protrusions 11 arranged in the width direction, and is placed at the intermediate position of the protrusion 11 in the width direction. Placed. The transporting flat belt 10 is rotated counterclockwise in FIG. 1, and along with the rotation, the transported object C is transported while being locked to the protrusions 11. At this time, the protrusion 11 is transported from the transported object C to the transport surface. A load is applied in the direction along In addition, for example, when the conveyed product C is caught by an obstacle or the like during conveyance, a large load may be applied to the protrusion 11 from the conveyed item C in a direction along the conveyance surface.

  In the present embodiment, the protrusions 11 are formed of an elastic material, and the recesses 13 are provided on the inner peripheral surface side of each protrusion 11. While slightly deforming to the right side in FIG. 1, it can be deformed by greatly sinking into the recess 13. That is, part of the load acting on the protrusion 11 is dispersed as a load acting on the inner peripheral side of the belt, and the protrusion 11 is greatly deformed. 11 and the belt main body 20 are not concentrated at the joint portion. Therefore, cracks and the like are less likely to occur at the joined portion, and the life of the conveying flat belt 10 can be extended.

  The manufacturing method of the flat belt 10 for conveyance which concerns on this embodiment is demonstrated using FIGS. FIG. 3 shows a vulcanization molding apparatus for manufacturing the conveying flat belt 10. FIG. 4 shows the inner mold of the vulcanization molding apparatus.

  As shown in FIG. 3, the vulcanization molding apparatus 30 according to this embodiment includes an inner mold 40 and an outer mold 50 that is disposed so as to surround the inner mold 40 so as to surround a radially outer side while keeping a predetermined distance. Is provided.

  The inner mold 40 is formed of a metal in a substantially cylindrical shape with the axis X as the center, and a passage (not shown) through which the heat medium passes is provided in the inner mold 40, and the heat medium passes through the inner mold 40. The outer peripheral surface 47 of the inner mold 40 is heated. On the upper surface and the lower surface of the inner mold 40, pipes 44 and 45 for sending and receiving the heat medium into and from the inner mold 40 are provided. As the heat medium, for example, warm water, water vapor, oil, or the like is used. As shown in FIG. 4, a rubber sheet 21 ′ is wound around the outer peripheral surface 47 of the inner mold 40 in a cylindrical shape, and an endless canvas 22 is placed thereon.

  As shown in FIG. 3, the outer mold 50 includes a plurality (eight in this embodiment) of outer mold pieces 51 arranged with a predetermined gap therebetween in the circumferential direction. Each of the outer mold pieces 51 is an arc piece that is curved, and the inner peripheral surface 51B is an arc having the same curvature, and the center of curvature coincides with the axis X. That is, the outer mold 50 is configured such that the same cylinder centered on the axis X is equally divided into eight outer mold pieces 51 in the circumferential direction by a gap 54 extending in parallel to the axis X direction from the upper end to the lower end. Is done.

  A cylinder 52 is attached to the outer side of each outer mold piece 51 in the radial direction. Each cylinder 52 can displace the entire outer mold piece 51 in the radial direction by fluid pressure that is hydraulic pressure, water pressure, air pressure, steam pressure, or a combination of two or more thereof. As the outer mold piece 51 is displaced in the radial direction, the entire outer diameter of the outer mold 50 is reduced or increased. Since each outer mold piece 51 is a rigid metal, it is displaced in the radial direction by each cylinder 52 without substantially deforming its shape.

  A schematic perspective view of each outer mold piece 51 is shown in FIG. As shown in FIG. 5, the inner peripheral surface 51B of each outer mold piece 51 is provided with a plurality of recessed portions 53 arranged in a line in a direction along the axis X (see FIG. 3). That is, the recessed portion 53 is provided only partially in the direction of the axis X on the inner peripheral surface 51B, in other words, is provided discontinuously in the direction of the axis X. The recessed portions 53 provided at the uppermost and lowermost positions are not connected to the upper end portion 51C and the lower end portion 51D of the inner peripheral surface 51B of the outer mold 50. Each recessed portion 53 is a recessed portion for forming a protrusion and has substantially the same shape as the protrusion 11, and the sectional shape of each recessed portion 53 is a rectangle that is long in the axial direction.

  Next, the vulcanization molding method according to this embodiment will be described with reference to FIGS. In the present embodiment, first, as described above, the rubber sheet 21 ′ and the canvas 22 are attached to the inner mold 40. Thereafter, a heat medium is supplied into the inner mold 40, the outer peripheral surface 47 of the inner mold 40 is heated, and heating of the rubber sheet 21 'and the canvas 22 is started. Simultaneously with the heating, each cylinder 52 is driven, each outer mold piece 51 is displaced radially inward, and the inner peripheral surface of the outer mold 50 is reduced in diameter. When the outer mold pieces 51 are displaced inward, the inner peripheral surfaces 51 </ b> B are brought into close contact with the canvas 22. Each outer mold piece 51 is further displaced radially inward after being in close contact with the canvas 22, and the rubber sheet 21 ′ and the canvas 22 are pinched by the outer mold piece 51 and the outer peripheral surface 47 of the inner mold 40. .

  When each outer mold piece 51 is displaced radially inward, the entire outer mold 50 is reduced in diameter, and the gap 54 provided between each outer mold piece 51 is narrowed. As a result, the outer mold pieces 51 gradually approach, but when the outer mold pieces 51 are in close contact with and pressed against the canvas 22, the outer mold pieces 51 may be in contact with each other or may be separated from each other. .

  When the rubber sheet 21 ′ and the canvas 22 are sandwiched and heated by the heat medium, the viscosity of the rubber sheet 21 ′ decreases and the rubber sheet 21 ′ is fluidized. By this fluidization, the rubber sheet 21 ′ is impregnated in the gaps between the fibers of the canvas 22, flows radially outward from the gaps, and flows into the recessed portions 53 (see FIG. 5). The rubber sheet 21 ′ that has flowed into the recessed portion 53 forms a protrusion 11 in the conveying flat belt 10. The pressing and heating to the rubber sheet 21 ′ and the canvas 22 are continued even after the rubber sheet 21 ′ flows into the recessed portion 53, and the rubber sheet 21 ′ is vulcanized and molded, and the canvas 22 and the rubber sheet 21 ′. Is vulcanized and bonded. Thereby, a cylindrical belt sleeve 31 configured by laminating the canvas 22 on the rubber layer 21 (see FIG. 2) formed by the rubber sheet 21 ′ is obtained, and one surface 31A ( On the outer peripheral surface in FIG. 6, a protrusion 11 is formed that protrudes radially outward and is integrally formed with the belt body 20 (see FIG. 2).

  After the belt sleeve 31 is formed, supply of the heat medium is stopped, supply of a cooling medium (for example, cooling water) is started inside the inner mold 40, and vulcanization is completed. When the vulcanization is completed, each outer mold piece 51 is displaced radially outward by each cylinder 52, the inner peripheral surface of the outer mold 50 is expanded, and released from the belt sleeve 31. Here, when each outer mold piece 51 is released from the belt sleeve 31, each outer mold piece 51 is displaced in a direction that coincides with the direction in which the protrusion 11 protrudes. The mold can be released without being caught. When the outer mold piece 51 is released, next, a force in the direction of the axis X is applied to the belt sleeve 31, and the belt sleeve 31 is released from the inner mold 40.

  Next, a method for forming the recess 13 in the belt sleeve 31 will be described with reference to FIG. As shown in FIG. 7, the belt sleeve 31 removed from the inner mold 40 is first turned over so that the outer peripheral surface thereof becomes the inner peripheral surface, and the protrusion 11 is formed on the inner peripheral surface side of the belt sleeve 31. Be placed. The belt sleeve 31 turned upside down is stretched in the circumferential direction and wound around a cylindrical polishing core 55.

  Here, the belt body of the belt sleeve 31 is formed of an elastic material. When the belt body 31 is wound around the polishing core 55 while being stretched, a force is applied radially inward from the belt sleeve 31, and one surface 31 </ b> A of the belt sleeve 31 is applied. (Inner peripheral surface in FIG. 7) and the protrusion 11 are pressed against the outer peripheral surface of the polishing core 55. As a result, the portion 34 corresponding to the protrusion 11 on the other surface 31 </ b> B (the outer peripheral surface in FIG. 7) of the belt sleeve 31 swells according to the height of the protrusion 11.

  In the present embodiment, in this state, the other surface 31B is polished, and the portion 34 swollen by this polishing is intensively polished, and the recess 13 (FIGS. 1 and 2) is formed on the other surface 31B of the belt sleeve 31. Is formed. The belt sleeve 31 formed with the recess 13 is cut to a predetermined width, and is turned over again so that the outer peripheral surface becomes the inner peripheral surface, and the protrusion 11 is disposed on the outer peripheral surface side. Is obtained.

  As described above, according to this embodiment, the protrusion 11 is easily formed on one surface of the belt and the recess 13 is formed on a portion corresponding to the protrusion 11 on the other surface. Moreover, since the protrusion 11 in this embodiment is integrally molded with the belt body, the protrusion 11 has high durability.

  A second embodiment according to the present invention will be described with reference to FIG. In the first embodiment, the hollow portion provided in the belt main body was a concave portion provided on the inner peripheral surface side of the belt main body, but in this embodiment, the hollow portion is provided in the belt main body, It is blocked. In the following description, the same members as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 8, the conveying flat belt 10 of the second embodiment has a belt body 20, and the belt body 20 has a first rubber layer 21a and a canvas 22 laminated in this order on a second rubber layer 21b. The canvas 22 constitutes the outer peripheral surface 20A of the belt, and the second rubber layer 22b constitutes the inner peripheral surface 20B of the belt.

  The belt main body 20 is formed in an endless manner as in the first embodiment, and the protrusion 11 is provided on the outer peripheral surface 20A thereof as in the first embodiment. In the belt main body 20, a hollow portion 63 is provided on the back side of the protrusion 11. Here, the hollow portion 63 is formed as a recess provided on the inner peripheral side of the first rubber layer 21a, and the second rubber layer 21b is laminated on the inner peripheral side of the first rubber layer 21a. The hollow portion 63 is closed by a rubber layer inside the belt body 20. Also in this embodiment, the cross-sectional shape of each protrusion 11 and each hollow part 63 presents a rectangle which is substantially the same shape and is long in the width direction. Moreover, these rectangles are substantially the same size, or the hollow part 63 is slightly large.

  As described above, also in the present embodiment, the protrusions 11 are formed of an elastic material, and the hollow portion 63 is provided on the inner peripheral surface side of each protrusion 11. When a load is applied, the protrusion 11 is slightly deformed along the conveying surface, and can be greatly deformed by sinking into the hollow portion 63. Therefore, the load acting on the protrusion 11 does not concentrate at the base of the protrusion 11, and it becomes difficult for cracks or the like to occur at the base of the protrusion 11, thereby improving the durability of the protrusion of the flat belt 10 for conveyance.

  Next, a method for manufacturing the conveying flat belt 10 according to the second embodiment will be described. In the present embodiment, as in the first embodiment, first, a first rubber layer 21a is laminated on the canvas 22, a protrusion 11 is provided on the outer peripheral surface side, and a recess is provided on the inner peripheral surface side. A sleeve is manufactured. Next, the second rubber layer 21b is further vulcanized and bonded to the inner peripheral surface side of the belt sleeve, whereby the conveying flat belt 10 according to the second embodiment is manufactured. In the belt sleeve manufacturing process before the second rubber layer 21b is laminated, in the vulcanization process, the temperature is lowered or the heating time is shortened, thereby reducing the first rubber layer 21a. It is better not to vulcanize completely. Thus, if the vulcanization is not complete, it is easy to vulcanize and bond the second rubber layer 21b to the first rubber layer 21a.

  In the second embodiment, a canvas may be laminated on the inner peripheral surface side of the belt instead of the second rubber layer 21b. Even in this case, the conveying flat belt 10 can be manufactured by the same method as described above.

  In the first and second embodiments, the shape of the protrusion has a substantially rectangular cross-sectional shape, but may be another shape, for example, a circle or an ellipse. Similarly, the cross-sectional shape of the hollow portion (the concave portion 13 or the hollow portion 63) may be, for example, a circle or an ellipse. In the first and second embodiments, the protrusion 11 and the hollow portion (the concave portion 13 or the hollow portion 63) have the same shape, but may have different shapes. However, the cross-sectional shape of the hollow portion is preferably larger than the cross-sectional shape of the protrusion 11 so that the protrusion 11 can sink into the hollow portion when a load is applied to the protrusion 11. In the first and second embodiments, the protrusion may be provided on the inner peripheral surface side of the belt and the concave portion may be provided on the outer peripheral surface side of the belt, depending on the usage.

  Hereinafter, in order to demonstrate the effect of this invention, it demonstrates using an Example, However, This invention is not necessarily limited to the Example shown below.

[Belt of Example]
The belt of the example is a flat belt for conveyance having the configuration of the first embodiment, and is configured by laminating canvas on the outer peripheral surface side of the rubber layer, and a plurality of protrusions are formed on the outer peripheral surface. Was an endless belt provided with a plurality of recesses corresponding to each protrusion. In the belt of the example, the rubber component of the rubber layer and the protrusions was millable urethane. The canvas was a knitted fabric formed by knitting PET (polyethylene terephthalate) fibers. The belt had a width of 30 mm and a length of 230 mm. Two protrusions were arranged 10 mm apart in the width direction, and eight protrusions were arranged at equal intervals in the longitudinal direction. The cross-sectional shape of each protrusion and each recess is a rectangle having the same shape and the same size. The rectangle has a side of 5 mm and the other side of 3 mm, and the rectangle is long in the width direction. The protrusions had a height of 0.5 mm, and the recesses had a depth of 0.5 mm.

[Comparative belt]
The belt of the comparative example was a belt having the same configuration as the belt of the example except that no recess was provided.

[Belt evaluation method]
The durability of the protrusions of the belts of the above examples and comparative examples was evaluated by the following test. As shown in FIG. 9, the belts B of the above-mentioned examples and comparative examples are each attached to two pulleys P by applying a tension of 7%, and 10 yen coins are loaded as a conveyed product C on the outer peripheral surface of the belt. I put it. The belt B is rotated at a speed of 100 mm / second, while the conveyed product C is stopped at a fixed position, and a load L of 40 g is applied to the conveyed product C from above, thereby conveying the conveyed product every time it rotates on each protrusion. A load was applied from C.

  In this test, the belt of the comparative example cracked at the base of the protrusion 5 hours after the start of the test, and the protrusion was peeled off from the belt body. On the other hand, in the belt of the example, each protrusion was not peeled from the belt body even after 48 hours.

  As is clear from the above test results, it can be understood that in the flat belt with protrusions, if a hollow portion (concave portion) is provided on the back side of the protrusion, the durability is improved as compared with a belt having no hollow portion.

It is a perspective view of the flat belt in the use condition which concerns on 1st Embodiment. It is a longitudinal cross-sectional view of the flat belt on the II-II line of FIG. It is a top view of a vulcanization molding device. It is a perspective view of the inner mold | type equipped with the rubber sheet and canvas. It is a perspective view of each outer mold piece. It is a top view of a vulcanization molding device for showing a process in which a rubber sheet and a canvas are compressed by an outer mold and an inner mold and a belt sleeve is molded. It is a top view for showing the molding method of a crevice. It is a longitudinal cross-sectional view of the flat belt which concerns on 2nd Embodiment. It is a typical top view for showing the test method for evaluating durability of a projection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flat belt for conveyance 11 Protrusion 13 Concave part 20 Belt main body 20A Outer peripheral surface 20B Inner peripheral surface 21 Rubber layer

Claims (7)

  A transport flat belt having a protrusion provided on one surface of a belt main body, wherein a hollow portion is formed on the back side of the protrusion in the belt main body.   2. The transporting flat belt according to claim 1, wherein a concave portion is provided at a position corresponding to the protrusion on the other surface of the belt main body, and the hollow portion is the concave portion.   The flat belt for conveyance according to claim 1, wherein the hollow portion is closed.   The transporting flat belt according to claim 1, wherein the protrusions are provided discontinuously in at least one of a width direction and a longitudinal direction of the one surface.   The transporting flat belt according to claim 1, wherein a plurality of the protrusions are arranged in at least one of a longitudinal direction and a width direction of the belt.   A protrusion is formed on one surface of the belt main body, and the one surface is pressed against a base so that a part of the other surface of the belt main body corresponding to the protrusion is inflated, and the swelled part is polished. A manufacturing method of the flat belt for conveyance which forms a crevice in the other side by doing. The said base is a columnar body, The said belt main body is shape | molded endlessly, it is wound around the said columnar body, and said one surface is pressed on the said columnar body. The manufacturing method of the flat belt for conveyance as described.

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