JP7104002B2 - Manufacturing method of coupling belt - Google Patents

Description

The present invention relates to a method for manufacturing a coupling belt in which the inner peripheral side and both side surfaces are covered with an outer cover cloth and the outer peripheral side is connected by a reinforcing cloth.

Conventionally, as a transmission belt for transmitting power, a belt configured as an annular belt including a rubber layer such as a V-belt, a V-ribbed belt, and a flat belt and transmitting power by friction is widely known. For example, the V-belt is configured as an annular transmission belt having a V-shaped cross section. As the V-belt, a wrapped V-belt and a low-edge V-belt are used. The wrapped V-belt is configured as a V-belt in which the entire peripheral surface of the belt body is covered with an outer cover over the entire length in the belt circumferential direction. On the other hand, the low-edge V-belt is configured as a V-belt in a state where the rubber layer on the side surface that transmits power by friction is exposed.

V-belts such as wrapped V-belts or low-edge V-belts, and transmission belts such as V-ribbed belts and flat belts are used properly according to the application due to differences in the surface texture or cross-sectional shape of the friction transmission surface. In the case of an application in which power can be transmitted by the above-mentioned transmission belt alone, only one transmission belt is used. On the other hand, in the case of an application having a large power transmission such as a large agricultural machine, it is necessary to use a plurality of the above transmission belts at the same time. That is, it is necessary to wrap a plurality of transmission belts around a pulley or the like of a rotating device in a state where they are arranged in parallel, and to use a plurality of transmission belts at the same time.

However, when a plurality of transmission belts are wound around a pulley or the like of a rotating device and a plurality of transmission belts are used at the same time, a tension difference may occur between the transmission belts and stable power transmission may be impaired. Further, contact occurs between adjacent transmission belts, and the contact may cause a problem of overturning in which the inner peripheral side and the outer peripheral side of the transmission belt are turned upside down and reversed. There is.

Therefore, in the case of an application in which the power to be transmitted is large, a coupling belt composed of a plurality of annular rubber belt portions having the same or corresponding configuration as the above-mentioned transmission belt is used. This coupling belt is configured as a belt in which the plurality of rubber belts are arranged in parallel and the outer peripheral sides of the plurality of rubber belts are connected by a reinforcing cloth and bonded.

In the production of the above-mentioned coupling belt, first, a plurality of annular rubber belt portions in which the outer covering is coated on the peripheral surface of each rubber layer are produced. Then, a tubular belt sleeve is produced in which a plurality of annular rubber belt portions are arranged in parallel and the outer peripheral side is connected by a reinforcing cloth. Next, the belt sleeve is cut in the circumferential direction, and the coupling belt in a state where the plurality of wrapped V-belts are coupled is cut out to form the coupling belt.

In the production of the bonding belt, for example, as shown in Patent Document 1, the unvulcanized rubber sheet of the compressed rubber layer material, the core wire, and the unvulcanized material of the stretched rubber layer are placed on the outer peripheral surface of the cylindrical drum. The rubber sheets are sequentially laminated and attached to form a tubular shape. As a result, a tubular unvulcanized sleeve having an unvulcanized rubber layer and a core wire is formed. Then, the produced unvulcanized sleeve is cut in the circumferential direction while being wound around the entire circumference of the cylindrical drum. As a result, an annular rubber layer is formed. Next, the annular rubber layer is removed from the drum, and both side surfaces of the annular rubber layer are cut (skipped) at a predetermined angle. As a result, the cross-sectional shape of the annular rubber layer is formed so as to have a V-shaped cross section. Then, an unvulcanized rubber belt is formed in a state in which the periphery thereof is covered with an outer cover. When this unvulcanized rubber belt is vulcanized, a wrapped V-belt is formed.

Then, a plurality of unvulcanized rubber belts configured in the same manner as the material of the wrapped V-belt are fitted into the grooves of the mold having a plurality of grooves having a V-shaped cross section in a state of being arranged in parallel. Next, the outer peripheral side of the plurality of unvulcanized rubber belts fitted in the mold in a state where the outer cover cloth is covered and arranged in parallel is covered with the reinforcing cloth. At the time of vulcanization, an unvulcanized rubber belt coated with a plurality of outer coats is fitted on the outer periphery of the mold, and the outer periphery is covered with a reinforcing cloth, and a rubber sleeve is further attached to the outer periphery. Then, they are stored in a vulcanization can and vulcanized under conditions such as a predetermined temperature. After vulcanization, the rubber sleeve and the mold are disassembled, and the belt sleeve, which is the vulcanized object, is taken out. As a result, a tubular belt sleeve is produced in which a plurality of annular vulcanized rubber belts are arranged in parallel and the outer peripheral side is connected by a reinforcing cloth.

When the above-mentioned tubular belt sleeve is produced by vulcanization, the belt sleeve is cut in the circumferential direction, and a coupling belt (wrapped coupling V-belt) in which a plurality of vulcanized rubber belts are bonded is cut out and formed. Ru. This completes the production of the coupling belt.

Japanese Unexamined Patent Publication No. 63-236630

In the above-mentioned conventional method for manufacturing a coupling belt, the outer cover is placed on the mold with the outer cover coated on the peripheral surface of the annular rubber layer. There is no need to arrange the vulcanized rubber layer on the mold. Therefore, the coupling belt can be manufactured with high production efficiency. Further, since it is not necessary to arrange the outer cover along the mold, wrinkles are less likely to occur, and the defect rate can be reduced. However, when the coupling belt is manufactured by the method described above, it is necessary to bond the outer cover cloth and the reinforcing cloth. Therefore, during use, pressure is applied to the coupling belt by a pulley that sandwiches the coupling belt from the side. Is added, and the coupling belt buckles and deforms. As a result, stress is concentrated on the adhesive surface between the outer cover cloth and the reinforcing cloth of the coupling belt, and the reinforcing cloth is likely to be peeled off.

The present invention is for solving the above problems, and an object of the present invention is to improve the production efficiency, reduce the defective rate, and improve the adhesive strength of the reinforcing cloth in the connecting belt. It is to realize a method for manufacturing a belt.

(1) In order to solve the above problems, in the method for manufacturing a coupling belt according to a certain aspect of the present invention, an outer coating is provided on the peripheral surface of an unvulcanized annular rubber layer in which the corners on the inner peripheral side are cut off. A rubber belt manufacturing step in which a plurality of coated annular unvulcanized rubber belts are manufactured, and a portion on the outer peripheral side of the unvulcanized rubber belt covered with the outer cover is cut off in the circumferential direction, and the unvulcanized rubber belt is cut. The step of cutting the rubber belt to expose the rubber layer from the above, and vulcanizing by arranging a reinforcing cloth on the outer peripheral side of the unvulcanized rubber belt in a state where a plurality of the unvulcanized rubber belts with the exposed rubber layer are arranged in parallel. By cutting the reinforcing cloth of the belt sleeve manufactured in the vulcanization step and the vulcanization step of manufacturing the tubular belt sleeve in the circumferential direction, at least two annular vulcanized rubber belt portions are joined. The vulcanization belt generation step of cutting out the vulcanized belt from the belt sleeve to generate the vulcanized belt is included.

According to this method, an annular unvulcanized rubber belt in which the outer coating is coated on the peripheral surface of the annular rubber layer is produced, and then the outer peripheral side portion is cut off in the circumferential direction to form an unvulcanized rubber belt. Place a reinforcing cloth and vulcanize. For this reason, the unvulcanized rubber belt in which the outer cover is already wrapped may be placed in the mold. Therefore, as in the conventional case, after the outer cover is placed, the unvulcanized rubber layer is further placed in the mold. There is no need to place it in. As a result, during vulcanization, the production efficiency can be improved and the defective rate of the product can be reduced.

Further, according to this method, in the rubber belt cutting step, the outer peripheral side portion of the unvulcanized rubber belt covered with the outer cover is cut in the circumferential direction to expose the rubber layer, and in the vulcanization step, the rubber layer is exposed. A reinforcing cloth is placed on the outer peripheral side in a state where a plurality of unvulcanized rubber belts exposed in the above are arranged in parallel to perform vulcanization. As a result, the portion of the rubber layer exposed from the unvulcanized rubber belt and the reinforcing cloth are bonded by vulcanization, so that the adhesive strength can be improved as compared with the conventional one in which the outer cover cloth and the reinforcing cloth are bonded.

Therefore, it is possible to realize a method for manufacturing a coupling belt, which can improve the production efficiency, reduce the defective rate, and improve the adhesive strength of the reinforcing cloth in the coupling belt.

(2) Preferably, in the rubber belt cutting step, the outer peripheral side portion of the unvulcanized rubber belt is cut by a wire.

According to this method, the outer peripheral portion of the unvulcanized rubber belt is cut off by the wire. Therefore, when cutting the unvulcanized rubber belt, the cut surface of the unvulcanized rubber belt can be smoothed. Further, since the unvulcanized rubber belt is cut using the wire as the cutting means, for example, as compared with the case where a cutter blade is used as the cutting means and the cutter blade is pressed against the cutting means, the cutting means is cut. Adhesion of unvulcanized rubber can be prevented. As a result, it is possible to suppress the deterioration of the cutting performance of the cutting means and to continuously and accurately cut the unvulcanized rubber belt.

(3) Preferably, in the rubber belt cutting step, the outer peripheral side portion of the unvulcanized rubber belt is cut by the wire reciprocating between the pair of bobbins.

According to this method, in the rubber belt cutting step, the unvulcanized rubber belt is cut by a wire running between the pair of bobbins. As a result, different parts of the long wire can be continuously used in order without using the same part of the wire intensively. Therefore, the time for each portion of the wire to be used for cutting is extremely short, and the cooling time of the wire due to heat dissipation after cutting can be secured. As a result, the heat generated in the wire can be suppressed and the adhesion of the unvulcanized rubber can be further reduced, so that the unvulcanized rubber belt can be cut more accurately and the production efficiency can be improved. Can be done.

(4) More preferably, in the bonding belt forming step, the reinforcing cloth is cut by a wire.

According to this method, in the bonding belt forming step, the reinforcing cloth of the belt sleeve produced in the vulcanization step is cut in the circumferential direction by the wire. Therefore, when cutting the reinforcing cloth of the belt sleeve, the cut surface of the reinforcing cloth can be smoothed. Further, by cutting the reinforcing cloth of the belt sleeve with a wire, it is possible to reduce the contact area of the cutting means with the cutting target as compared with the case where the cutter blade is pressed as the cutting means, and the cutting target can be reduced. The reinforcing cloth is smoothly cut and can be cut out accurately.

(5) A method for manufacturing a coupling belt, preferably, in the coupling belt generation step, the reinforcing cloth is cut by the wire reciprocating between a pair of bobbins.

According to this method, in the coupling belt generation step, the reinforcing cloth is cut by a wire running between the pair of bobbins. Therefore, by applying a driving force to the pair of bobbins, the wire can be driven at high speed and continuously, and the reinforcing cloth of the coupling belt with the vulcanized rubber belt bonded can be cut more smoothly and accurately. be able to.

According to the present invention, it is possible to realize a method for manufacturing a coupling belt, which can improve the production efficiency, reduce the defect rate, and improve the adhesive strength of the reinforcing cloth in the coupling belt.

It is a perspective view which shows a part of the coupling belt manufactured by one Embodiment of this invention, and is the figure which shows the part in the cross section. It is a chart figure which shows an example of the whole process of the manufacturing method of the coupling belt which concerns on embodiment of this invention. It is a perspective view which shows the annular unvulcanized rubber ring-shaped body in which the unvulcanized rubber layer is laminated. FIG. 3 is a cross-sectional view showing a cross section of the unvulcanized rubber ring-shaped body shown in FIG. 3 in a direction perpendicular to the circumferential direction, and is a cross-sectional view showing a state in which a skive treatment is performed. It is sectional drawing which shows the unvulcanized rubber belt in the state which the corner part on the inner peripheral side of the unvulcanized rubber ring-shaped body was skived, and the outer cover was covered. It is sectional drawing which shows the rubber belt cutting process which cuts the part on the outer peripheral side of the unvulcanized rubber belt shown in FIG. It is a figure which shows typically the state in which the unvulcanized rubber belt which cut off the outer peripheral side part was installed in the mold in the step of vulcanizing the unvulcanized rubber belt. It is sectional drawing which shows the part of the mold shown in FIG. 7 enlarged. It is a figure which shows typically the state in which the unvulcanized rubber belt on which the reinforcing cloth is arranged is vulcanized. It is sectional drawing which shows the part of the mold shown in FIG. 9 enlarged. It is a perspective view which shows the cylindrical belt sleeve after vulcanization. FIG. 12A is a cross-sectional view schematically showing a cross section of the belt sleeve shown in FIG. 11 in a direction perpendicular to the circumferential direction, and is a diagram showing a case where a coupling belt is cut out for each of two vulcanized rubber belt portions. be. FIG. 12B is a diagram showing a case where a coupling belt is cut out for each of the three vulcanized rubber belt portions in the same manner. It is a figure which shows typically the mechanism which runs the tubular belt sleeve shown in FIG. 11 and the mechanism which cuts out a coupling belt from a running tubular belt sleeve. FIG. 14A is a diagram showing a coupling belt according to an embodiment, and FIG. 14B is a diagram showing a coupling belt according to a comparative example. It is a table which shows in a list about the rubber composition of the coupling belt which concerns on Example and Comparative Example. It is a figure which shows typically the pulley mechanism used in the evaluation test. It is a table which shows a list about each setting condition about the pulley mechanism used in the evaluation test. It is a table which shows the result of the durability test about the adhesive strength in a list. It is a table which shows the result of the durability test by the measurement of the rubber hardness in a list.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a perspective view showing a part of a coupling belt 100 (wrapped coupling V-belt 100) manufactured according to an embodiment of the present invention, and is a diagram showing a part in a cross section. In FIG. 1, a cross section perpendicular to the circumferential direction of the coupling belt 100 extending in an annular shape is shown. The coupling belt 100 is a coupling belt having a V-shaped cross section and a plurality of annular vulcanized rubber belt portions 101 whose surface is coated, and may be referred to as a wrapped coupling V-belt.

In the bonding belt 100, the annular unvulcanized rubber belt 11 in which the outer coating 106 is coated on the peripheral surface of the annular rubber layer from which the corners on the inner peripheral side have been cut is cut, vulcanized, cut, or the like. Was generated. The coupling belt 100 includes a vulcanized rubber belt portion 101 in a state where the unvulcanized rubber belt 11 is vulcanized, and a reinforcing cloth 102. The coupling belt 100 is configured as a belt in which a plurality of annular vulcanized rubber belt portions 101 are arranged in parallel and the outer peripheral side is connected by a reinforcing cloth 102. The coupling belt 100 is configured as a belt in a state in which a plurality of vulcanized rubber belt portions 101 are connected by the reinforcing cloth 102.

Note that FIG. 1 illustrates a form of a coupling belt 100 in which two annular vulcanized rubber belt portions 101 are arranged side by side and the outer peripheral side is connected by a reinforcing cloth 102. FIG. 1 illustrates a coupling belt in which two vulcanized rubber belt portions 101 are connected and bonded by a reinforcing cloth 102, but the coupling belt to which the manufacturing method of the coupling belt manufactured by the present embodiment is applied. The type does not have to be the same, for example, with respect to the coupling belt 100 in which three or more vulcanized rubber belt portions 101 are connected and bonded by the reinforcing cloth 102, the method for manufacturing the coupling belt produced by the present embodiment is used. May be applied.

The two vulcanized rubber belt portions 101 of the coupling belt 100 are similarly configured. Each vulcanized rubber belt portion 101 includes a compressed rubber layer 103 and an stretched rubber layer 104 as rubber layers, a core wire 105, and an outer cover 106.

The main body of the vulcanized rubber belt portion 101 provided in an annular shape has a laminated structure, and the compressed rubber layer 103, the core wire 105, and the stretched rubber are formed from the inner peripheral side to the outer peripheral side of the vulcanized rubber belt portion 101. The layers 104 are sequentially laminated. Therefore, in the vulcanized rubber belt portion 101, the core wire 105 is embedded between the compressed rubber layer 103 and the stretched rubber layer 104. The core wire 105 is arranged so as to extend along the circumferential direction of the vulcanized rubber belt portion 101. The core wires 105 are arranged at predetermined intervals along the width direction of the vulcanized rubber belt portion 101 in a cross section perpendicular to the circumferential direction of the vulcanized rubber belt portion 101. The circumferential direction of the vulcanized rubber belt portion 101 is the same as the circumferential direction of the coupling belt 100, and the width direction of the rubber belt portion 101 is the same direction as the width direction of the coupling belt 100.

Further, the vulcanized rubber belt portion 101 is subjected to a skive treatment in which the corner portion on the inner peripheral side of the side surface is cut off when the unvulcanized rubber belt 11 is in the state, and the cross-sectional shape is perpendicular to the circumferential direction. Has a V-shaped cross-sectional shape. More specifically, the cross-sectional shape of the vulcanized rubber belt portion 101 is configured to have a trapezoidal shape in which the dimension in the width direction decreases from the outer peripheral side to the inner peripheral side of the vulcanized rubber belt portion 101.

Further, the vulcanized rubber belt portion 101 is configured to be covered with an outer cover 106 over the entire length in the circumferential direction at a portion other than the outer peripheral side of the peripheral surface of the endless main body portion provided in an annular shape. That is, in the vulcanized rubber belt portion 101, the side surface and the inner peripheral side surface of the vulcanized rubber belt portion 101 are covered with the outer cover 106.

The reinforcing cloth 102 is provided as a back cloth that integrally joins a plurality of vulcanized rubber belt portions 101 on the back side, which is the outer peripheral side of the connecting belt 100. In the coupling belt 100, the reinforcing cloth 102 is provided so that the plurality of vulcanized rubber belt portions 101 can exhibit the strength as an integral belt element. Further, the reinforcing cloth 102 is configured as an annular cloth portion, and is integrally bonded to the cut end faces of the stretch rubber layer 104 and the outer cloth 106 by vulcanization. As a result, the reinforcing cloth 102 connects a plurality of annular vulcanized rubber belt portions 101 arranged in parallel on the outer peripheral side thereof.

FIG. 2 is a chart diagram showing an example of the entire process of the manufacturing method of the coupling belt 100 according to the embodiment of the present invention. As shown in FIG. 2, the manufacturing method of the coupling belt 100 includes a rubber belt manufacturing step S101, a rubber belt cutting step S102, a vulcanization step S103, and a coupling belt generation step S104.

The rubber belt manufacturing step S101 is configured as a step of forming an unvulcanized wrapped V-belt having an unvulcanized rubber layer and a core wire. The rubber belt manufacturing step S101 includes a rubber layer forming step S105, a skiving step S106, and an outer cover coating step S107.

In the rubber layer forming step S105, first, a sheet of unvulcanized rubber (that is, rubber in a state where vulcanization has not been performed) is formed by rolling. Then, the unvulcanized rubber sheet formed by rolling is cut to a predetermined length. The unvulcanized rubber sheet cut to a predetermined length is wound around a rotating drum (not shown) which is provided in a cylindrical or columnar shape and is rotatably supported as a winding mold. Be done. The unvulcanized rubber sheet wound around the outer circumference of the rotating drum is formed into a cylindrical shape by joining the ends thereof. The unvulcanized rubber sheet formed into a tubular shape serves as a material for the compressed rubber layer 103 in each unvulcanized rubber belt portion 101 of the coupling belt 100.

Then, when a cylindrical unvulcanized rubber molded body (not shown) is formed on the outer periphery of the rotating drum, the above-mentioned core wire 105 is then wound along the circumferential direction. The core wire 105 is wound around a cylindrical unvulcanized rubber molded body in a spiral shape along the circumferential direction while being displaced at a predetermined pitch along the width direction. The width direction of the cylindrical unvulcanized rubber molded body is configured as a direction parallel to the axial direction of the rotating drum. The core wire 105 is wound around a cylindrical unvulcanized rubber molded body over a substantially overall length in the width direction.

When the winding of the core wire 105 around the outer periphery of the tubular unvulcanized rubber molded body is completed, then the sheet of the unvulcanized rubber formed by rolling is wound from above the core wire 105. The unvulcanized rubber sheet wound from above the core wire 105 is formed into a cylindrical shape by joining the ends thereof. A tubular unvulcanized rubber sheet wound around the outer peripheral side of the core wire 105 serves as a material for the stretch rubber layer 104 in each rubber belt portion 101 of the coupling belt 100.

FIG. 3 is a perspective view showing an annular unvulcanized rubber ring 10 in which unvulcanized rubber layers are laminated. When the unvulcanized sleeve (not shown) is formed by the rubber layer forming step S105 described above, the unvulcanized sleeve is then cut in the circumferential direction to form an annular unvulcanized rubber ring-shaped body 10. The annular unvulcanized rubber ring-shaped body 10 is configured as an unvulcanized rubber ring-shaped body extending in a ring shape with a rectangular cross section, and the unvulcanized rubber as the material of the compressed rubber layer 103 is formed from the inner peripheral side to the outer peripheral side thereof. The unvulcanized rubber layer, which is the material of the layer, the core wire 105, and the stretched rubber layer 104, is sequentially laminated.

FIG. 4 is a cross-sectional view showing a cross section of the unvulcanized rubber ring-shaped body shown in FIG. 3 in a direction perpendicular to the circumferential direction, and is a cross-sectional view showing a state in which a skive treatment is performed. FIG. 5 is a cross-sectional view showing the unvulcanized rubber belt 11 in a state where the corners on the inner peripheral side of the unvulcanized rubber ring-shaped body are skived and the outer cover 106 is covered. The corresponding parts of the unvulcanized rubber layer corresponding to the compressed rubber layer 103 and the stretched rubber layer 104 are designated by the same reference numerals in FIGS. 4 and 5, and in FIGS. 6 and 8 described later. Is shown. As shown in FIG. 4, the skiving step S106 skives by cutting both corners on the inner peripheral side of both side surfaces of the unvulcanized rubber belt 11 so as to scrape in the circumferential direction, and skives the unvulcanized rubber belt. It is configured as a step of changing the cross-sectional shape of 11. In the skiving step S106, both corners of the unvulcanized rubber layer on the inner peripheral side of the unvulcanized rubber belt 11 on the inner peripheral side are cut so as to be scraped in the circumferential direction. As a result, the cross-sectional shape of the unvulcanized rubber belt 11, which had a rectangular cross section before the treatment of the skive step S106, is changed to FIG. 4 in the state after the treatment of the skive step S106. As shown in, the cross-sectional shape is a combination of a rectangular portion and a trapezoidal portion.

The outer cover coating step S107 is configured as a step of coating the annular unvulcanized rubber belt 11 for which the treatment of the skive step S106 has been completed with the outer cover 106. In the outer cover coating step S107, as shown in FIG. 5, the entire peripheral surface of the annular unvulcanized rubber belt 11 is covered with the outer cover 106 over the entire length in the circumferential direction. As a result, the unvulcanized rubber belt 11 (unvulcanized wrapped V-belt) formed by coating the unvulcanized rubber belt 11 with the outer cover 106 is formed.

FIG. 6 is a cross-sectional view showing a rubber belt cutting step S102 for cutting a portion on the outer peripheral side of the unvulcanized rubber belt 11 shown in FIG. The rubber belt cutting step S102 is configured as a step of cutting the outer peripheral side portion of the unvulcanized rubber belt 11 covered with the outer cover 106 in the circumferential direction to expose the rubber layer from the unvulcanized rubber belt 11. In the rubber belt cutting step S102, the unvulcanized rubber belt 11 is wound around a pair of pulleys and rotationally traveled in the circumferential direction. In the unvulcanized rubber belt 11, the outer peripheral side portion of the unvulcanized rubber belt 11 is cut off by the wire traveling mechanism 12. Further, the wire traveling mechanism 12 has a moving mechanism for approaching and moving to the unvulcanized rubber belt 11 in the traveling state.

The wire traveling mechanism 12 includes a wire 14 and a pair of bobbins 13 and 13. The wire traveling mechanism 12 is configured as a mechanism for linearly traveling a portion of the wire 14 to which tension is applied. In the rubber belt cutting step S102 in the present embodiment, the rubber belt is cut by a single wire 14 to which tension is applied to reciprocate between the pair of bobbins 13 and 13. More specifically, the unvulcanized rubber belt 11 is cut by a wire 14 approaching the outer peripheral side of the traveling unvulcanized rubber belt 11 in a state of being wound around a pair of pulleys and traveling.

The wire 14 running between the pair of bobbins 13 and 13 is arranged so as to be parallel to the running direction of the unvulcanized rubber belt 11 wound around the pulley. Then, the outer peripheral side portion of the traveling unvulcanized rubber belt 11 is cut off by pressing the wire 14. The wire 14 is configured as one long continuous wire 14. The wire 14 may have, for example, a core wire configured as a piano wire which is a metal wire made of carbon steel, and a diamond wire in which diamond abrasive grains are fixed to the surface of the core wire by electrodeposition may be used.

Each of the pair of bobbins 13 and 13 is provided as a disk-shaped member, and both ends of one continuous wire are wound around each other and rotate synchronously in a state where tension is maintained. Further, the pair of bobbins 13 and 13 are provided with recessed grooves (not shown) around which the wire 14 is wound over the entire circumference of the outer circumference. The pair of bobbins 13 and 13 have rotating shafts 15 and 15 that rotatably support the disc-shaped bobbins, respectively. Both ends of the wire 14 are fixed to the pair of bobbins 13 and 13, respectively.

The unvulcanized rubber belt 11 whose outer peripheral side is cut off by the wire traveling mechanism 12 is in a state where the stretched rubber layer 104 is exposed on the cut surface. That is, the unvulcanized rubber belt 11 remains in a state where the inner peripheral surface and both side surfaces are covered with the outer cover 106, and the stretched rubber layer 104 not covered with the outer cloth 106 is exposed on the outer peripheral side. It becomes a state. When the rubber belt cutting step S102 is completed, the vulcanization step S103 for vulcanizing the unvulcanized rubber belt 11 generated in the rubber belt cutting step S102 is performed.

FIG. 7 is a diagram schematically showing a state in which the unvulcanized rubber belt 11 having the outer peripheral side cut off is installed in the mold 16 in the vulcanization step S103 for vulcanizing the unvulcanized rubber belt 11. FIG. 8 is an enlarged cross-sectional view showing a part of the mold 16 shown in FIG. 7. In the vulcanization step S103, a plurality of unvulcanized rubber belts 11 having an exposed rubber layer are arranged in parallel, and a reinforcing cloth 102 is arranged on the outer peripheral side of the unvulcanized rubber belt 11 to vulcanize the tubular shape described later. It is configured as a step of manufacturing the belt sleeve 22 of the above.

With reference to FIG. 7, the unvulcanized rubber belt 11 (hereinafter, also referred to as the unvulcanized rubber belt 11 after excision), in which the above-mentioned outer cover 106 is covered and the outer peripheral side portion is excised, is a pair of extension pulleys 17. , 17 is wrapped around. Further, between the pair of extension pulleys 17 and 17, an unvulcanized rubber belt 11 after excision and a mold 16 for vulcanizing the unvulcanized rubber belt 11 are installed so as to be openable and closable.

The pair of extension pulleys 17 and 17 are rotatably supported by shafts, and one side of the extension pulleys 17 and 17 is rotationally driven by the power of a drive motor (not shown). The pair of extension pulleys 17 and 17 hold the wound unvulcanized rubber belt 11 after excision so as to be rotatable. Further, the pair of extension pulleys 17 and 17 have at least one side thereof so that they can be brought close to each other and separated from each other when the unvulcanized rubber belt 11 after excision on which the reinforcing cloth 102 is arranged is wound or removed. It is provided so that it can be moved. That is, one side of the pair of extension pulleys 17 and 17 is provided so as to be relatively displaceable with respect to the other side.

The mold 16 is for vulcanizing the unvulcanized rubber belt 11 after excision in which the reinforcing cloth 102 is arranged, in a state of being wound around a pair of extension pulleys 17 and 17. As shown in FIG. 8, the mold 16 has an inner peripheral side mold 19 and an outer peripheral side mold 20. The inner peripheral side mold 19 is provided with a heat source portion 18 that serves as a heat source when vulcanizing the unvulcanized rubber belt 11 after excision in which the reinforcing cloth 102 is arranged. The heat source portion 18 may also be provided in the outer peripheral side mold 20.

The inner peripheral side mold 19 is arranged on the inner peripheral side of the unvulcanized rubber belt 11 after excision in a state of being wound around the pair of extension pulleys 17 and 17. The inner peripheral side mold 19 has a linear groove portion 21 into which the inner peripheral side of the unvulcanized rubber belt 11 after excision is fitted before vulcanization.

As shown in FIGS. 7 and 8, the outer peripheral mold 20 is arranged on the outer peripheral side of the unvulcanized rubber belt 11 after cutting, which is wound around the pair of extension pulleys 17 and 17. That is, the outer peripheral side mold 20 is arranged outside the reinforcing cloth 102 arranged on the outer peripheral side of the unvulcanized rubber belt 11. The unvulcanized rubber belt 11 after excision is arranged in the groove 21 of the inner peripheral mold 19. Then, the reinforcing cloth 102 is arranged on the outer peripheral side of the unvulcanized rubber belt 11 after excision arranged in the inner peripheral side mold 19. The reinforcing cloth 102 may be impregnated with unvulcanized rubber.

FIG. 9 is a diagram schematically showing a state in which the unvulcanized rubber belt 11 on which the unvulcanized rubber belt 11 reinforcing cloth 102 is arranged is vulcanized. FIG. 10 is an enlarged cross-sectional view showing a part of the mold 16 shown in FIG. Prior to vulcanization, first, a plurality of unvulcanized rubber belts 11 with the stretched rubber layer 104 exposed are arranged in parallel, and a reinforcing cloth 102 is arranged on the outer peripheral side of the unvulcanized rubber belt 11.

Then, referring to FIGS. 9 and 10, at the time of vulcanization, the inner peripheral side mold 19 is arranged with the unvulcanized rubber belt 11 after cutting together with the reinforcing cloth 102, and then the outer peripheral side mold 20 is used as a mold. It will be tightened. As shown in FIGS. 9 and 10, the unvulcanized rubber belt 11 after excision in which the reinforcing cloth 102 is arranged has only a part of the region molded by the inner peripheral side mold 19 and the outer peripheral side mold 20. It is vulcanized. Regarding the region of the unvulcanized rubber belt 11 after excision in the vicinity of the extension pulley that was not molded into the mold 16, after the mold 16 was opened once, it was rotated by a pair of extension pulleys 17 and 17, and the mold was re-molded. Vulcanization is performed after mold-clamping 16. In the vulcanization step S103, the entire mold is vulcanized by repeating the opening and closing of the mold 16 and the rotation operation of the unvulcanized rubber belt 11 on which the reinforcing cloth is arranged.

FIG. 11 is a perspective view showing a tubular belt sleeve 22 after vulcanization. As shown in FIG. 11, the vulcanized tubular belt sleeve 22 is formed in a cylindrical shape, and a plurality of vulcanized rubber belt portions 101 are reinforced in a state of being adjacent to each other with a predetermined dimensional interval. They are connected by a cloth.

After the tubular belt sleeve is formed by the vulcanization step S103, the coupling belt forming step S104 is then performed. In the bonded belt generation step S104, the reinforcing cloth 102 of the tubular belt sleeve 22 produced in the vulcanization step S103 is cut in the circumferential direction, and at least two annular vulcanized rubber belt portions 101 are bonded. The coupling belt 100 is cut out from the belt sleeve 22.

FIG. 12A is a cross-sectional view schematically showing a cross section of the belt sleeve 22 shown in FIG. 11 in a direction perpendicular to the circumferential direction, and shows a case where a coupling belt is cut out for each of two vulcanized rubber belt portions 101. It is a figure. FIG. 12B is a diagram showing a case where a coupling belt is cut out for each of the three vulcanized rubber belt portions 101 in the same manner. With reference to FIGS. 12A and 12B, the tubular belt sleeve 22 is cut in the circumferential direction, so that the coupling belt 100 is cut out from the tubular belt sleeve 22. In FIGS. 12A and 12B, the cutting line 23 when the reinforcing cloth 102 of the tubular belt sleeve 22 is cut along the circumferential direction is shown by a broken line. FIG. 12A shows a case where a coupling belt to which two vulcanized rubber belt portions 101 are bonded is cut out from the tubular belt sleeve 22. FIG. 12B shows a case where a coupling belt to which three vulcanized rubber belt portions 101 are bonded is cut out from the tubular belt sleeve 22.

FIG. 13 is a diagram schematically showing a sleeve traveling mechanism 24 for traveling the tubular belt sleeve 22 shown in FIG. 11 and a wire traveling mechanism 27 for cutting out the coupling belt 100 from the traveling tubular belt sleeve 22. ..

The sleeve traveling mechanism 24 in which the vulcanized tubular belt sleeve 22 travels in the circumferential direction is configured to include a driving roll 25, a driven roll 26, and the like. Then, the sleeve traveling mechanism 24 is such that the cylindrical belt sleeve 22 after vulcanization is wound around at least a part of the outer periphery of the rotating body configured as the driving roll 25 and the driven roll 26, and the rotating body is described above. Is configured as a mechanism for rotating the vulcanized tubular belt sleeve 22 in the circumferential direction. The wire-traveling device 27 that cuts the cylindrical belt sleeve after vulcanization that travels on the sleeve traveling mechanism 24 has the same mechanism as the wire traveling mechanism 12 described above, and thus the description thereof will be omitted.

The drive roll 25 and the driven roll 26 are configured as a rotating body that rotates around a rotation shaft 28. The drive roll 25 is configured to be rotationally driven by inputting a drive torque from a drive motor (not shown). The driven roll 26 is rotatably supported around the rotation shaft 28. That is, the drive torque input to the drive roll 25 is transmitted to the driven roll 26 via the cylindrical belt sleeve to rotate the driven roll 26.

A plurality of grooves extending in the circumferential direction are provided on the outer peripheral side of the drive roll 25 and the driven roll 26, and each of the plurality of vulcanized rubber belt portions 101 in the cylindrical belt sleeve 22 after vulcanization is fitted. It is configured as follows. Since the depth of the groove is set lower than the height of the vulcanized rubber belt portion 101, the reinforcing cloth 102, the drive roll 25, and the driven roll 25 and the driven roll 25 are in a state where the vulcanized rubber belt portion 101 is fitted into the drive roll 25 and the driven roll 26. A gap is formed between the driven rolls 26. Therefore, when the tubular belt sleeve 22 after vulcanization is cut, the wire 14 is safely and surely cut without contacting the driving roll 25 and the driven roll 26.

In the coupling belt generation step S104, the coupling belt 100 is cut out from the tubular belt sleeve 22 by using the sleeve traveling mechanism 24 and the wire traveling mechanism 27 similar to that used in the rubber belt cutting step S102. In the coupling belt generation step S104, the tubular belt sleeve 22 travels in a state of being wound around the drive roll 25 and the driven roll 26 of the sleeve traveling mechanism 24 and traveling. Then, the reinforcing cloth 102 of the tubular belt sleeve 22 is cut by one wire 14 to which tension is applied to reciprocate between the pair of bobbins 13 and 13. The wire 14 running between the pair of bobbins 13 and 13 is arranged in a direction parallel to the tangential direction of the portion of the belt sleeve 22 wound around the driven roll 26. Then, similarly to the wire traveling mechanism 12, the connecting belt is cut out by pressing the wire 14 against the reinforcing cloth 102 of the traveling tubular belt sleeve 22.

The wire traveling mechanism 27 is configured in the same manner as the wire traveling mechanism 12 used for cutting the outer peripheral side portion of the unvulcanized rubber belt 11, and is configured to travel the wire 14 between the pair of bobbins 13 and 13. ..

As described above, the reinforcing cloth of the cylindrical belt sleeve 22 after vulcanization traveling on the sleeve traveling mechanism 24 is cut along the circumferential direction by the wire 14 traveling back and forth between the pair of bobbins 13 and 13. The coupling belt is cut out by.

The coupling belt 100 cut by the wire traveling mechanism 27 is removed from the drive roll 25 and the driven roll 26, and the manufacturing process of the series of coupling belts 100 is completed.

[Example]
Next, as an example, a coupling belt (hereinafter, referred to as a coupling belt according to the embodiment) 100 was manufactured by the method for manufacturing a coupling belt according to the present embodiment. Further, as a comparative example, a coupling belt (hereinafter, referred to as a coupling belt according to the comparative example) 110 was manufactured by a manufacturing method different from that of the present embodiment. Then, an evaluation test was conducted using the coupling belt 100 according to the example and the coupling belt 110 according to the comparative example. In the evaluation test, the coupling belts 100 and 110 according to the examples and the comparative examples are run on the pulley mechanism 30 described later, and the adhesive strength of the reinforcing cloth 102 before and after the running is compared with the amount of change in the rubber hardness. The evaluation was made by doing. In the evaluation of the adhesive strength, the residual adhesive strength was calculated and evaluated as the residual ratio based on the adhesive strength before and after the running. Moreover, in the evaluation of the rubber hardness, the evaluation was made by comparing the difference in the rubber hardness before and after the running.

FIG. 14A is a diagram showing the coupling belt 100 according to the embodiment, and FIG. 14B is a diagram showing the coupling belt 110 according to the comparative example.

As shown in FIG. 14A, the coupling belt 100 according to the embodiment includes three vulcanized rubber belt portions 101 and a reinforcing cloth 102 that connects the three vulcanized rubber belt portions 101 on the outer peripheral side. Has been done. The vulcanized rubber belt portion 101 of the coupling belt 100 according to the embodiment is composed of a compressed rubber layer 103, an stretched rubber layer 104, a core wire 105, and an outer cover 106. The coupling belt 100 according to the embodiment is manufactured by the manufacturing method according to the present embodiment, and the reinforcing cloth 102 is arranged and vulcanized on the unvulcanized rubber belt 11 in which the outer peripheral side portion is cut off in the circumferential direction. ing.

On the other hand, as shown in FIG. 14B, the coupling belt 110 according to the comparative example includes three wrapped rubber belt portions 111 and a reinforcing cloth 112 for connecting the three wrapped rubber belt portions 111 on the outer peripheral side. It is composed of. The wrapped rubber belt portion 111 of the coupling belt 110 according to the comparative example is composed of a compressed rubber layer 113, an stretch rubber layer 114, a core wire 115, and an outer cover 116.

The coupling belt 110 according to the comparative example was manufactured without cutting off the outer peripheral side portion of the unvulcanized rubber belt 11 as in the method for manufacturing the coupling belt according to the present embodiment. That is, as shown in FIG. 14B, the coupling belt 110 according to the comparative example is a wrapped coupling in which three annular wrapped rubber belt portions 111 whose entire surface is covered with the outer cover cloth 116 are connected by the reinforcing cloth 112. It is a V-belt. The coupling belt 110 according to the comparative example is different from the manufacturing method according to the above-described embodiment in that the rubber belt cutting step S102 is not included. That is, unlike the coupling belt 100 according to the embodiment, the wrapped rubber belt portion 111 of the coupling belt 110 according to the comparative example is configured in a state in which the stretch rubber layer 114 and the outer cover 116 are not cut off.

FIG. 15 is a table showing a list of rubber compositions of the coupling belts 100 and 110 according to Examples and Comparative Examples. In FIG. 15, the blending amount of each composition is represented by parts by mass. FIG. 15 shows each composition as a material for the compressed rubber layer 103, the stretched rubber layer 104, the reinforcing cloth 102, and the outer cover cloth 106 of the coupling belt 100 according to the embodiment. That is, the binding belt 100 according to the example in the unvulcanized state contains chloroprene rubber, magnesium oxide, stearic acid, an antioxidant, carbon black, a plasticizer, a vulcanization accelerator, and zinc oxide as materials.

Note that FIG. 15 also shows a rubber composition of an adhesive rubber layer arranged between the compressed rubber layer 103 and the stretched rubber layer 104 as a material constituting the bonding belt 100 according to the example in the unvulcanized state. rice field. Further, the rubber composition of the friction rubber is shown as the material of the outer cover 106 of the coupling belt 100 according to the example in the unvulcanized state. Further, as the material of the reinforcing cloth 102 of the bonding belt 100 according to the example in the unvulcanized state, a rubber composition of friction rubber and a rubber composition of laminated rubber are shown. Further, the rubber composition and the compounding ratio of the bonding belt 110 according to the comparative example in the unvulcanized state are the same as those of the bonding belt 100 according to the example in the unvulcanized state.

PM-40 manufactured by DENKA Co., Ltd. was used as the chloroprene rubber. Kyowa Mag 30 manufactured by Kyowa Chemical Industry Co., Ltd. was used as magnesium oxide, and stearic acid camellia manufactured by NOF Corporation was used as stearic acid. Further, non-flex OD-3 manufactured by Seiko Kogyo Co., Ltd. was used as an antiaging agent, and Seast 3 manufactured by Tokai Carbon Co., Ltd. was used as carbon black. Further, RS-700 manufactured by ADEKA Co., Ltd. was used as a plasticizer, Noxeller TT manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd. was used as a vulcanization accelerator, and three types of zinc oxide manufactured by Shodo Chemical Industry Co., Ltd. were used as zinc oxide.

A woven fabric (not shown) having a mass ratio of polyester fibers and cotton of 50:50 is embedded in the outer coverings 106 and 116 of the bonding belts 100 and 110 according to the examples and the comparative examples. The woven fabric was woven with a wide-angle weave of 120 degrees, and the fineness used was 20th warp and 20th weft. The yarn densities of the warp and weft are set to 75 threads / 50 mm, and the basis weight is set to 280 g per square meter. In the production of the outer coats 106 and 116 of the coupling belts 100 and 110 according to the examples and the comparative examples, the rubber composition was supplied together with the woven fabric to a pair of rolls having different surface velocities. At this time, a friction treatment was performed in which the rubber composition was rubbed once on the front and back sides of the woven fabric.

In the production of the reinforcing cloth 102 of the coupling belt 100 according to the embodiment, the laminated rubber was laminated on the molded body of the outer cloth 106 subjected to the friction treatment, and the laminated rubber was supplied to a pair of rolls having the same surface velocity. As the woven fabric of the reinforcing cloth 102, the same woven fabric as that used for the outer cover cloth 106 was used.

A polyester fiber twisted cord having an average wire diameter of 1.289 mm was used for the core wires 105 and 115 of the coupling belts 100 and 110 according to Examples and Comparative Examples.

[Evaluation method]
Next, the evaluation method performed using the coupling belts 100 and 110 according to the examples and the comparative examples will be described. In the evaluation, an evaluation test was conducted using a pulley mechanism 30 capable of running the coupling belts 100 and 110 according to the examples and comparative examples in a state of applying tension.

FIG. 16 is a table schematically showing the pulley mechanism 30 used in the evaluation test. FIG. 17 is a table showing a list of each setting condition and the like related to the pulley mechanism 30 used in the evaluation test. In the evaluation test, after the coupling belts 100 and 110 according to the examples and the comparative examples were run by the pulley mechanism 30, the decrease in the adhesive strength and the change in the rubber hardness due to bending fatigue were compared. In the evaluation test, three coupling belts 100 according to the examples were used and three coupling belts 110 according to the comparative example were used.

With reference to FIG. 17, as the coupling belts 100 and 110 according to the examples and comparative examples used in the evaluation test, the A-shaped ones specified by the JIS standard were used, and the belt size of 1.778 m was used. The vulcanized rubber belt portion 101 according to the embodiment connected by the reinforcing cloth 102 is three, and the wrapped rubber belt portion 111 according to the comparative example is three.

With reference to FIG. 16, the pulley mechanism 30 includes a drive pulley 31, a driven pulley 32, a tension pulley 33, and a swing shaft 34. The drive pulley 31 applies a rotational force to the coupling belts 100 and 110 according to the examples and the comparative examples in the evaluation test. The drive pulley 31 is rotatably supported by a support shaft (not shown). A groove extending in the circumferential direction is formed on the outer peripheral surface of the drive pulley 31. The groove formed on the outer peripheral surface of the drive pulley 31 is formed in a V shape in a cross section parallel to the axial direction. Three grooves having a V-shaped cross section extending in the circumferential direction of the drive pulley 31 are arranged side by side in the axial direction. The rotation speed of the drive pulley 31 in the evaluation test is set to 3200 rpm, and the outer diameter of the drive pulley 31 is set to 0.12 m.

The driven pulley 32 is provided together with the drive pulley 31 as a rotating body that supports the coupling belts 100 and 110 according to the examples and the comparative examples so as to be able to travel in the circumferential direction. The driven pulley 32 is rotatably supported by a support shaft (not shown). The driven pulley 32 is arranged so that its axis is parallel to the axis of the drive pulley 31. A groove having a V-shaped cross section extending in the circumferential direction similar to that of the drive pulley 31 is formed on the outer peripheral surface of the driven pulley 32. The coupling belts 100 and 110 according to the examples and the comparative examples rotate in the circumferential direction with the inner peripheral side fitted in the V-shaped groove formed on the outer peripheral surfaces of the drive pulley 31 and the driven pulley 32. The coupling belts 100 and 110 according to the examples and the comparative examples are configured to be deeply fitted into the grooves on the outer peripheral side of the drive pulley 31 and the driven pulley 32 when tension is applied from the outer peripheral side during rotational running. .. The outer diameter of the driven pulley 32 is set to 0.13 m.

The tension pulley 33 is provided to apply tension to the coupling belts 100 and 110 according to Examples and Comparative Examples that travel between the drive pulley 31 and the driven pulley 32 in the circumferential direction. As shown in FIG. 16, the tension pulley 33 is supported by a swing shaft 34, which will be described later, in a state where it can be approached and separated from the coupling belts 100 and 110 according to the examples and comparative examples. The tension pulley 33 is arranged so that its axis is parallel to the axes of the drive pulley 31 and the driven pulley 32. The tension pulley 33 is formed in a columnar shape and is configured as a so-called flat pulley having no groove on the outer peripheral surface. The outer diameter of the tension pulley 33 is set to 0.07 m. In a state where tension is applied to the coupling belts 100 and 110 according to the examples and comparative examples, the tension pulley load applied to the coupling belts 100 and 110 by the tension pulley 33 is set to 215.7N.

The swing shaft 34 is a member that swingably supports the tension pulley 33 in order to apply tension to the coupling belts 100 and 110 according to the examples and comparative examples. One end side of the swing shaft 34 is swingably supported. The other end side of the swing shaft 34 rotatably supports the tension pulley 34. The tension pulley 33 supported by the swing shaft 34 is configured to be close to and separated from the coupling belts 100 and 110 according to the embodiment and the comparative example traveling between the drive pulley 31 and the driven pulley 32.

When the tension pulley 33 is held away from the coupling belts 100 and 110 according to the examples and comparative examples as shown by the alternate long and short dash line in FIG. 16, the coupling belts 100 and 110 are separated from the drive pulley 31 and the driven pulley. It fits shallowly in the groove of 32. At this time, the drive pulley work rate received by the drive pulley 31 from the coupling belts 100 and 110 according to the examples and the comparative examples is 4.8 KW.

On the other hand, when the tension pulley 33 is held in a state where tension is applied to the coupling belts 100 and 110 according to the examples and the comparative examples as shown by the solid line in FIG. 16, the coupling belts 100 and 110 are driven. It fits deeply into the grooves of the pulley 31 and the driven pulley 32. When tension is applied to the coupling belts 100 and 110 according to the examples and the comparative examples from the tension pulley 33, the power of the drive pulley under load received from the coupling belts 100 and 110 by the drive pulley 31 is 14. It is 3KW.

The tension was applied to the coupling belts 100 and 110 by the tension pulley 33 for 120 seconds. Then, after the tension was applied for 120 seconds, it was held in a state of being separated for 60 seconds. The tension applied by the tension pulley 33 was repeatedly applied, and the coupling belts 100 and 110 according to the present example and the comparative example were each applied 1000 times.
[Evaluation results]

FIG. 18 is a table showing a list of the results of the durability test regarding the adhesive strength. The residual rates of the coupling belts 100 according to the examples were 83%, 87%, and 88%, respectively, which were higher than the results of 55%, 62%, and 66% of the comparative examples. That is, the bonding belt 100 according to the example was able to suppress the decrease in adhesive strength as compared with the bonding belt 110 according to the comparative example, and was able to suppress the decrease in durability.

FIG. 19 is a table showing a list of the results of the durability test by measuring the rubber hardness. FIG. 19 shows changes in rubber hardness before and after running of the coupling belts 100 and 110 according to Examples and Comparative Examples of running on the pulley mechanism 30. The amount of change in the rubber hardness of the coupling belt 100 according to the examples was 3, 4, 4, which was lower than the amount of change in the rubber hardness of the coupling belt 110 according to the comparative example 6, 7, 8. That is, it is determined that the coupling belt 100 according to the example has improved flexibility as compared with the coupling belt 110 according to the comparative example, thereby suppressing the generation of heat and suppressing the increase in rubber hardness. From this result, the coupling belt 100 according to the example can suppress the occurrence of breakage due to the increase in rubber hardness as compared with the coupling belt 110 according to the comparative example, and can realize a longer life.

According to this method, an annular unvulcanized rubber belt 11 in which the outer cover 106 is coated on the peripheral surface of the annular rubber layer is produced, and then the outer peripheral side portion is cut off in the circumferential direction. The reinforcing cloth 102 is arranged on the rubber belt 11 and vulcanized. Therefore, since the unvulcanized rubber belt 11 in which the outer cover 106 is already wound may be arranged in the mold 16, the unvulcanized rubber is further arranged after the outer cover 106 is arranged as in the conventional case. There is no need to arrange the layers on the mold 16. As a result, during vulcanization, the production efficiency can be improved and the defective rate of the product can be reduced.

Further, according to this method, in the rubber belt cutting step S102, the outer peripheral side portion of the unvulcanized rubber belt 11 covered with the outer cover 106 is cut in the circumferential direction to expose the rubber layer, and the vulcanization step S103. In the above, a plurality of unvulcanized rubber belts 11 having an exposed rubber layer are arranged in parallel, and a reinforcing cloth 102 is arranged on the outer peripheral side to perform vulcanization. As a result, the portion of the rubber layer exposed from the unvulcanized rubber belt 11 and the reinforcing cloth 102 are bonded by vulcanization, so that the adhesive strength is improved as compared with the conventional one in which the outer cover cloth 106 and the reinforcing cloth 102 are bonded. be able to.

Therefore, it is possible to realize a method for manufacturing the coupling belt 100, which can improve the production efficiency, reduce the defect rate, and improve the adhesive strength of the reinforcing cloth 102 in the coupling belt 100.

According to this embodiment, the outer peripheral side portion of the unvulcanized rubber belt 11 is cut off by the wire 14. Therefore, when the unvulcanized rubber belt 11 is cut, the cut surface of the unvulcanized rubber belt 11 can be smoothed. Further, in order to cut the unvulcanized rubber belt 11 using a wire as a cutting means, for example, as compared with the case where a cutter blade is used as the cutting means and the cutter blade is pressed against the cutting means, the cutting means is used. It is possible to prevent the adhesion of unvulcanized rubber. As a result, it is possible to suppress the deterioration of the cutting performance of the cutting means and to continuously and accurately cut the unvulcanized rubber belt 11.

According to the present embodiment, in the rubber belt cutting step S102, the unvulcanized rubber belt 11 is cut by the wire 14 running between the pair of bobbins 13 and 13. As a result, different parts of the long wire 14 can be continuously used in order without using the same part of the wire 14 intensively. Therefore, the time for each portion of the wire 14 to be used for cutting is extremely short, and the cooling time of the wire 14 due to heat dissipation after cutting can be secured. As a result, the heat generated in the wire 14 can be suppressed and the adhesion of the unvulcanized rubber can be further reduced, so that the unvulcanized rubber belt 11 can be cut more accurately and the production efficiency is improved. Can be made to.

According to the present embodiment, in the coupling belt forming step S104, the reinforcing cloth 102 of the belt sleeve 22 produced in the vulcanization step S103 is cut in the circumferential direction by the wire 14. Therefore, when the reinforcing cloth 102 of the belt sleeve 22 is cut, the cut surface of the reinforcing cloth 102 can be smoothed. Further, by cutting the reinforcing cloth 102 of the belt sleeve 22 with the wire 14, it is possible to reduce the contact area of the cutting means with the cutting target as compared with the case where the cutter blade is pressed as the cutting means. , The reinforcing cloth to be cut can be cut smoothly and accurately.

According to the present embodiment, in the coupling belt generation step S104, the reinforcing cloth 102 is cut by the wires 14 running between the pair of bobbins 13 and 13. Therefore, by applying a driving force to the pair of bobbins 13, 13, the wire 14 can be driven at high speed and continuously, and the reinforcing cloth 102 of the coupling belt 100 in the state where the vulcanized rubber belt 10 is bonded can be made smoother. It can be cut accurately and accurately.

The manufacturing method of the embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be modified in various ways as long as it is described in the claims. For example, it may be changed as follows.

(1) For example, in the above-described embodiment, in the vulcanization step S103, the mold 16 is opened and closed by using the inner peripheral side mold 19 having the linear groove portion 21, and the pair of extension pulleys 17 and 17 is not used. The entire circumferential direction is vulcanized by repeating the rotational operation of the vulcanized rubber belt 11, but this may not be the case. For example, the entire mold may be vulcanized in a single operation using a mold 16 having an annular groove capable of accommodating the unvulcanized rubber belt 11.

(2) Further, for example, in the above-described embodiment, in the coupling belt generation step S107, a tubular shape after vulcanization is provided by a single wire 14 to which tension is applied to reciprocate between the pair of bobbins 13 and 13. The reinforcing cloth 102 of the belt sleeve 22 is cut, but this may not be the case. For example, two or more sets of a pair of bobbins 13 and 13 may be provided, and the pair of bobbins 13 and 13 may be cut by two wires 14 that reciprocate between the two sets of bobbins 13 and 13. Further, it is possible to adjust the distance between these two pairs of bobbins 13 and 13 so that the end portion of the reinforcing cloth 102 after cutting does not protrude outward from the coupling belt 100. ..

(3) Further, in the coupling belt 100 manufactured by the above-described embodiment, the reinforcing cloth 102 of the tubular belt sleeve 22 after vulcanization is circumscribed by a wire 14 reciprocating between the pair of bobbins 13 and 13. It is cut to, but it does not have to be this way. For example, a plurality of wire traveling mechanisms 27 may be provided in parallel at predetermined intervals to cut out a plurality of coupling belts 100 at a time.

The present invention can be widely applied to a method for manufacturing a wrapped coupling V-belt in which the inner peripheral side and both side surfaces are covered with the outer cover cloth 106 and the outer peripheral side is connected by the reinforcing cloth 102.

100 coupling belt (wrapped coupling V-belt)
101 Vulcanized rubber belt part 102 Reinforcing cloth 106 Outer cloth 11 Unvulcanized rubber belt 22 Belt sleeve S101 Rubber belt manufacturing process S102 Rubber belt cutting process S103 Vulcanization process S104 Bonded belt generation process

Claims (5)

A rubber belt manufacturing process in which a plurality of annular unvulcanized rubber belts in which an outer cover is coated on the peripheral surface of an unvulcanized annular rubber layer in which the corners on the inner peripheral side are cut off are manufactured.
A rubber belt cutting step of cutting the outer peripheral side portion of the unvulcanized rubber belt covered with the outer cover in the circumferential direction to expose the rubber layer from the unvulcanized rubber belt.
A vulcanization step of producing a tubular belt sleeve by arranging a plurality of unvulcanized rubber belts with exposed rubber layers in parallel and vulcanizing by arranging a reinforcing cloth on the outer peripheral side of the unvulcanized rubber belt. When,
By cutting the reinforcing cloth of the belt sleeve produced in the vulcanization step in the circumferential direction, a bonded belt in a state where at least two annular vulcanized rubber belt portions are bonded is cut out from the belt sleeve to generate a bonded belt. A method for manufacturing a coupling belt, which comprises a binding belt generation step. The method for manufacturing a coupling belt according to claim 1.
A method for manufacturing a coupling belt, characterized in that, in the rubber belt cutting step, a portion on the outer peripheral side of the unvulcanized rubber belt is cut by a wire. The method for manufacturing a coupling belt according to claim 2.
A method for manufacturing a coupling belt, characterized in that, in the rubber belt cutting step, a portion on the outer peripheral side of the unvulcanized rubber belt is cut by the wire reciprocating between a pair of bobbins. In the method for manufacturing a coupling belt according to claim 2 or 3.
A method for manufacturing a coupling belt, which comprises cutting the reinforcing cloth with a wire in the bonding belt generation step. In the method for manufacturing a coupling belt according to claim 4.
A method for manufacturing a coupling belt, characterized in that, in the coupling belt generation step, the reinforcing cloth is cut by the wire reciprocating between a pair of bobbins.

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