JPH10100280A - Jacket for manufacturing belt sleeve and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the number of using times of a matrix by decreasing operating man-hours in the case of manufacturing a belt sleeve and facilitating an operation for releasing the matrix after vulcanization. SOLUTION: The jacket is used to manufacture a vulcanized cylindrical belt sleeve having a cogged part disposed at least on an outer peripheral side of a rubber layer by embedding a core wire in the layer. The jacket 30 is constituted by enclosing a matrix 31 covered with a toothed canvas 36 on an inner periphery of a cogged rubber layer 37 alternately having protruding parts 35 and recess parts 35 at a predetermined interval along a circumferential direction with an enclosure 32, and integrally laminating the mold 31 and the enclosure 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jacket for producing a belt sleeve and a method for producing the same, and reduces the number of working steps when producing a belt sleeve for a power transmission belt such as a low-edge single cog belt or a low-edge double cog belt. The present invention relates to a belt sleeve manufacturing jacket in which the number of uses of a matrix is increased and a method for manufacturing the same.

[0002]

2. Description of the Related Art A preform manufacturing method and a spancog manufacturing method are typical examples of a conventional method for manufacturing a low-edge cog belt in which a cog portion is provided on the outer peripheral surface of a formed body. In the preform manufacturing method, a flat mother die with a goku longer than the belt circumference is prepared in advance, and an unvulcanized rubber sheet is placed thereon, and heated and pressed by a press to produce a preformed body.
After winding the rubber layer and the core wire around the mold, the preform was wound from above and butt-jointed to complete the molding, and the process was shifted to the vulcanization step. The matrix with a goku used here had convex portions and concave portions alternately at predetermined intervals on the front surface, and the reinforcing canvas was laminated on the back surface.

[0003] As a spancog manufacturing method, for example, after a reinforcing cloth, an unvulcanized rubber sheet, a core wire, an unvulcanized rubber sheet and the like are sequentially wound around a mold, a molded body is produced.
A cylindrical cog with a cog is placed on the molded body from the top according to the outer circumference of the belt, and then a jacket is inserted from above and vulcanized to mold the surface of the rubber layer with cogs provided on the base. Was to do. After vulcanization, the operator removed the molded article with the mother mold from the jacket and removed the mother mold.

[0004]

The preform manufacturing method is as follows.
Because the reinforcing cloth and unvulcanized rubber sheet are formed in advance,
Although an accurate goku portion is formed, there is a problem that the cost increases because a preform step is added. In addition, since the matrix was deformed due to the heat shrinkage of the reinforcing canvas during vulcanization, stable dimensions could not be ensured, so that it could not be reused and the master was used only once. Also,
It is necessary to remove the mother die after vulcanization, but in this case, since the mother die is thermally contracted and strongly adhered to the vulcanization sleeve, it was a very heavy labor for the operator.

[0005] In addition, in the spancog manufacturing method, as in the case of the preform manufacturing method, it is necessary to cover the master with a cog at the time of vulcanization and to remove the master after vulcanization. It was hard work. Moreover, since the canvas used as a reinforcing material shrinks by heat during vulcanization and does not secure stable dimensions, the number of uses of the matrix is limited to about 3 to 5 times. The unusable matrix was scrapped. Therefore, simplification of the operation of peeling off a mother die provided with a cog after vulcanization and increasing the number of uses of the mother die have been problems to be solved at an early stage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and reduces the man-hours required for fabricating a belt sleeve, facilitates the work of peeling off the master after vulcanization, and reduces the number of uses of the master. An object of the present invention is to provide an increased belt sleeve manufacturing jacket and a method for manufacturing the same.

[0007]

That is, according to the first aspect of the present invention, a core wire is embedded in a spiral in a rubber layer.
A jacket used to produce a vulcanized belt sleeve of a cylindrical body having a cog portion on at least the outer peripheral surface side of the rubber layer, and has convex portions and concave portions at predetermined intervals along a circumferential direction. In a belt sleeve manufacturing jacket, a mother die having an inner peripheral surface of a cog-forming rubber layer having alternately coated toothed canvas is surrounded by an outer cover, and the mother die and the outer cover are laminated and integrated.
By using a jacket in which a matrix having convex portions and concave portions provided at predetermined intervals along the circumferential direction is laminated and integrated inside the outer cover, the process of attaching and detaching the master die is eliminated, and the number of work steps is reduced. The work of peeling off the master after vulcanization is also facilitated, the heat shrinkage deformation of the master during vulcanization is reduced, the number of times of use can be increased, and the material cost can be reduced.

In the invention according to claim 2 of the present application, a cored wire is buried in a spiral in a rubber layer, and a vulcanized belt sleeve of a cylindrical body having a cog portion disposed at least on the outer peripheral surface side of the rubber layer is manufactured. In the manufacturing method of the jacket used at the time,
Cover the jointed cylindrical toothed canvas on the engraving drum with circumferentially extending grooves and teeth extending in the longitudinal direction alternately along the circumferential direction, and coat the cog-forming rubber layer on it. After the rubber layer is wound, a rubber layer to be an outer cover is further wound to form a molded body. After a flange is provided on at least one edge of the molded body, the flange is vulcanized and removed from the engraving drum. This is a method for producing a jacket for producing a belt sleeve, and since no reinforcing canvas is used, it is possible to provide a jacket that can reduce the heat shrinkage of the jacket during vulcanization and increase the number of uses.

According to the third aspect of the present invention, since the rubber layer serving as the cog-forming rubber layer and the rubber layer serving as the outer cover are made of the same material, the cog-forming rubber layer and the outer cover are separated. And the time for forming the cog-forming rubber layer and the outer cover can be reduced.

In the invention described in claim 4 of the present application, since the jointed cylindrical toothed canvas is easily expanded and contracted in the circumferential direction, the rubber layer of the cog-forming rubber layer is used to form the toothed canvas into the grooved shape of the engraving drum. It is easy to penetrate into the part, and a cog part having an accurate shape can be formed.

[0011]

1 is a cross-sectional view of a jacket for producing a belt sleeve according to the present invention, and FIGS. 2 to 3 show steps of manufacturing the jacket. The jacket 30 used here is
The mother die 31 and the outer cover 32 are laminated and integrated. The master mold 31 has a cog-forming rubber layer 3 having concave portions 34 and convex portions 35 provided at predetermined intervals along the circumferential direction.
7 is covered with a tooth canvas 36, and an outer cover 32 surrounds the back (outside) of the matrix 31 with vulcanized rubber.
A flange 38 for sealing the inside during vulcanization is provided at one end of the outer cover 32.

The matrix 31 becomes a part of the jacket 30,
Since the surface having the concave portions 34 and the convex portions 35 is covered with the tooth canvas 36 and the back surface is protected by the thick outer cover 32, the heat shrinkage deformation of the matrix 31 during vulcanization is small. As a result, the number of times of use increases, and the work of peeling off the mother die 31 after vulcanization becomes easy because the outer cover 32 is attached.

As the toothed canvas 36, a warp (longitudinal direction)
6 nylon, 6.6 nylon, 6/10 nylon, 4
・ Polyamide fiber such as 6 nylon and 12 nylon, polyester fiber, polyvinyl alcohol, polyethylene,
It is a spun yarn such as a polypropylene filament yarn or cotton. The composition of this filament yarn is 3 to 25 monofilaments each having 10 to 50 deniers.
The warp is formed by giving a twist of 30 times / 10 cm in the S or Z direction. Alternatively, a multifilament yarn obtained by bundling 10 to 200 filaments of 1 to 6 denier aramid fibers or twisting the bundles can be used. On the other hand, the weft (circumferential direction) is a highly stretchable yarn, and has a configuration in which, for example, a urethane elastic yarn, a crimped yarn of a polyamide fiber, a spun yarn, and the like are combined.
The toothed canvas 36 is a cloth woven in plain weave, twill weave, satin weave, or the like, and is not particularly limited.

In the tooth canvas 36, the RFL processing is not necessarily performed.
It is not necessary to perform an adhesive treatment such as an epoxy treatment, an isocyanate treatment, and a soaking treatment. This is to improve the air flow in the constituent yarns of the tooth portion canvas 36 and between the constituent yarns, and to improve the air leakage when the surface of the rubber layer is molded.

The rubber of the cog-forming rubber layer 37 and the outer cover 32 is composed of natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, alkylated chlorosulfanated polyethylene, hydrogenated nitrile rubber, hydrogenated nitrile rubber and unsaturated rubber. It is a rubber material such as a polymer mixed with a metal carboxylate alone or a mixture thereof, and there is no particular limitation. However, these are preferably made of the same kind of rubber and having high heat resistance.

The method of manufacturing the jacket 30 is as follows.
Cylindrical toothed canvas with a joint, for example, a sewing machine joint or a hot melt joint, is provided on an engraving drum 50 in which groove-shaped portions 51 and tooth-shaped portions 52 extending in the longitudinal direction on the circumferential surface are alternately provided along the circumferential direction. 36, and a non-vulcanized rubber layer 53 having a predetermined thickness to become the cog-forming rubber layer 37 is wound thereon, and an unvulcanized rubber layer 54 having a predetermined thickness to become the outer cover 32 is further wound thereon to form a molded body 55. After attaching a flange 38 made of unvulcanized rubber extending outward to at least one edge of the molded body 55, another cylindrical jacket is fitted and put into a vulcanized can. After vulcanization, the molded body 55 can be extracted from the engraving drum. still,
At the time of vulcanization, the unvulcanized rubber layer 53 is
As described above, the cylindrical toothed canvas having high elasticity in the circumferential direction is used for flowing into the fabric.

An example of manufacturing a double cog belt sleeve using the jacket 30 will be described below. FIG. 4 is a diagram showing a method for producing a molded article constituting a compression rubber layer, a core wire, and an extension rubber layer on a mold in a method for producing a double cog belt sleeve. First, the tooth 2 and the groove 3
Are prepared alternately. Further, one to several reinforcing cloths 5, an unvulcanized rubber sheet 6 to be a compressed rubber layer, and an unvulcanized rubber sheet 7 to be an adhesive rubber layer are laminated, and a flat portion in which teeth and grooves are alternately arranged. The cog pad 9 in which the cog part 8 is formed is formed by placing the cog pad 8 in a mold and applying pressure. Of course, in the present invention, instead of the mold 1 having the tooth portions 2 and the groove portions 3 alternately, it is also possible to use a mold equipped with an inner matrix having grooves at predetermined intervals along the circumferential direction. .

The mold 1 is mounted on a molding machine (not shown), and a cog pad 9 of a predetermined length is wound around the mold 1 one round while the cog portion 8 of the cog pad is fitted into the groove 3 of the mold, and the ends are brought into contact. After that, the core wire 10 made of a cord of polyester fiber, aramid fiber, glass fiber or the like is spirally wound. On it, 0 to several reinforcing cloths 12
Then, a laminate of the unvulcanized rubber sheet 13 of the stretched rubber layer is wound to form a molded body 15.

The rubbers used as the compression rubber layer and the extension rubber layer are natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, alkylated chlorosulfanated polyethylene, hydrogenated nitrile rubber, hydrogenated nitrile rubber. A rubber material such as a mixed polymer of rubber and a metal salt of unsaturated carboxylic acid alone or a mixture thereof may be used, for example, a para-aramid fiber (trade name: Twaron, Kevlar, Technora), nylon, polyester, vinylon, cotton, etc. The short fibers are oriented in the belt width direction. The amount of the short fiber is 5 to 40 parts by weight based on 100 parts by weight of the rubber. The above-mentioned short fibers may be included in the adhesive rubber layer, but are preferably not included.

The reinforcing cloths 5 and 12 are made of cotton, polyester fiber,
It may be a wide-angle canvas made of nylon or the like and woven in a plain weave, a twill weave, a satin weave, or the like, wherein the crossing angle between the warp and the weft is about 90 to 120 °. After the RFL treatment, the reinforcing cloths 5 and 12 are subjected to fiction coating of the rubber composition to obtain a canvas with rubber. The RFL solution is obtained by mixing a latex with an initial condensate of resorcinol and formalin. Latexes used herein include chloroprene, styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile, NBR, and the like.

According to the present invention, the mold 1 taken out of the molding machine is placed on the support 20. One or both of the side walls 16 of the mold 1 have a holding hole at the center as shown in FIG. 17, a locking hole 18 provided along the circumferential direction, and a small positioning projection 19 provided at a position away from the center.

On the other hand, as shown in FIG. 5, the support base 20 has a main projection 21 provided at the center, a locking hole 23 provided on a concentric circle centered on the main projection 21, and a center of the main projection. And a set of alignment projections 22 adjacent to the position away from the projection.

When the mold 1 is set on the support 20,
The holding hole 17 of the mold 1 is inserted into the main projection 21 provided on the support 20, and the positioning projection 19 of the mold 1 is fitted between the adjacent positioning projections 22 of the support 20, and the mold 1 is moved. Fix correctly on the support base 20.

The guide rod 25 is made of metal or synthetic resin, and has a stop portion 27 projecting vertically from one bent end portion 26, and a stop portion 28 having a straight and easily removable shape at the other end. ing. As shown in FIGS. 6 to 8, the plurality of guide rods 25 have stopper portions 27, 28 at both ends in a locking hole 18 provided in the mold 1 and a locking hole 23 provided in the support base 20.
Inserted into and fixed. At this time, the guide rod 25 is
5 in contact with or slightly away from the surface.

FIG. 9 shows that after the guide rod 25 is mounted on the surface of the molded body 15, the mother die 31 made of vulcanized rubber is covered with the outer cover 32.
The jacket 30 laminated and integrated inside the guide rod 25
Is shown along the line. That is, the jacket 30 is provided with the matrix 3 provided at predetermined intervals along the circumferential direction.
The first concave portion 34 is inserted while being fitted into the guide rod 25. For this reason, the size of the cross section of the guide rod 25 is such that it is completely fitted into the concave portion 34 of the matrix 31, but is slightly smaller than the concave portion 34. The cross-sectional shape is circular, oval, square, or the like, and is not particularly limited.

Subsequently, all the guide bars 25 are removed.
Thereafter, the molded body 15 is set in a vulcanizing can. Vulcanization is carried out in the usual way. After vulcanization, the jacket 30 in which the matrix 31 is laminated and integrated is pulled out, and the cylindrical double cog belt sleeve 40 is further removed from the mold.

In the structure of the double cog belt sleeve obtained by the method of the present invention, the core wire is embedded in the adhesive rubber layer, and the upper and lower portions of the adhesive rubber layer have an extension rubber layer and a compression rubber layer, respectively. For the stretch rubber layer and the compression rubber layer,
Cogs are provided at a constant pitch along the longitudinal direction of the belt. In the belt of the present embodiment, the groove bottom of the cog portion provided on the extension rubber layer and the groove bottom of the cog portion provided on the compression rubber layer coincide with each other. Of course, in the method of the present invention, it is also possible to set so that the groove bottom of the cog provided on the stretched rubber layer coincides with the top of the cog provided on the compressed rubber layer.
Note that it is not always necessary to use the above-described guide bar 25.

When manufacturing a single cog belt sleeve, first, a mold having a flat surface is prepared, and one or several reinforcing cloths, an unvulcanized rubber sheet to be an extended rubber layer, and an adhesive rubber layer are formed thereon. Laminate the unvulcanized rubber sheet, further wrap the core wire spirally, and wrap an unvulcanized rubber sheet and one to several reinforcing cloths on it as a compressed rubber layer,
A molded body is produced. This laminating method is completely opposite to the double cog belt sleeve 40.

Subsequently, the jacket 30 in which the matrix 31 is laminated and integrated inside the outer cover 32 is inserted into the molded body 15. Thereafter, this is set in a vulcanizing can and vulcanized. After vulcanization, the jacket 30 in which the matrix 31 is laminated and integrated, and then the cylindrical sleeve are removed from the mold.

[0030]

EXAMPLES Hereinafter, the effects of the present invention will be confirmed by more specific experimental examples. Example 1 210 denier warp made of 6.6 nylon and 6.6
A twill woven fabric composed of weft yarns obtained by twisting 140 denier of nylon and 140 denier of 6.6 nylon is used as a sewing machine to form a cylindrical toothed canvas, which is covered with an engraving drum, and a cog-forming rubber layer is formed thereon. After winding a rubber layer made of SBR having a thickness of 5 mm and further winding a rubber layer made of SBR having a thickness of 10 mm as an outer cover,
A jacket was produced by vulcanization in a usual manner.

As the core wire, a polyethylene terephthalate fiber of 1,100 deniers is twisted at 11.4 turns / 10
cm, the number of lower twists is 21.0 times / 10 cm, and the yarn is twisted in the upside down direction to form a 2 × 3 twist structure.
00 unprocessed code was prepared. Next, the untreated cord is pre-dip with an isocyanate-based adhesive, dried at about 170 to 180 ° C., immersed in an RFL solution,
Stretch heat setting was performed at 200 to 240 ° C. to obtain a treated cord.

As the reinforcing cloth, a spun cotton yarn and a plain woven canvas were used. After immersing these canvases in the RFL solution, they were heat-treated at 150 ° C. for 2 minutes to obtain treated canvases. Then, apply the rubber composition to these treated canvas
Coaching to make a canvas with rubber.

For the compression rubber layer and the extension rubber layer, a rubber composition composed of chloroprene rubber containing short fibers of aramid was used, and for the adhesive rubber layer, a rubber composition composed of chloroprene rubber containing no short fibers was used.

The cog pad is formed by laminating one reinforcing cloth, an unvulcanized rubber sheet of a compression rubber layer and an unvulcanized rubber sheet of an adhesive rubber layer, and forming a flat mold having teeth and grooves alternately arranged. A cog pad having a cog portion formed thereon was formed by installing and pressing at 80 ° C.

After preparing these materials, a cog pad was wrapped around the inner matrix mounted on a flat mold, and a cord, a flat stretched rubber layer, and a reinforcing cloth were sequentially wrapped to form a formed body. Subsequently, after the mold was set at a predetermined position on the support base, six guide rods were attached at regular intervals, and the jacket was inserted and set along the guide rods. After removing all the guide rods, the mold was placed in a vulcanizer and vulcanized to obtain a belt sleeve.

The obtained low edge double cog belt sleeve has an upper width of 36.5 mm, a thickness of 16.5 mm, and a length of 1
310 mm, the depth of the upper cog is 5.0 mm, the depth of the lower cog is 5.0 mm, the pitch of the upper and lower cogs is 10.7 mm, and the maximum deviation of the groove bottom of the upper and lower cogs is 1.5 mm. Was.

Using the above jacket, a belt sleeve was produced by continuing vulcanization 20 times. However, no heat shrinkage of the matrix constituting the jacket was observed, and the jacket could be used continuously.

COMPARATIVE EXAMPLE 1 Using exactly the same material as in Example 1, a cog pad was wrapped around an inner matrix mounted on a flat mold, and a core, a flat stretched rubber layer, and a reinforcing cloth were sequentially wrapped around the formed body. Was prepared. Subsequently, after setting the mold at a predetermined position on the support base, six guide rods were mounted at regular intervals, and the matrix was inserted and set along the guide rods. After removing all the guide rods, the mold in which the jacket was inserted was placed in a vulcanizing can and vulcanized to obtain a belt sleeve. A belt sleeve was manufactured by using the above master and the jacket, and vulcanizing was continued 5 times, but the heat shrinkage of the mother during the vulcanization was severe, and using more than this would form a cog section accurately. Became difficult.

[0039]

As described above, according to the first aspect of the present invention, the teeth are formed on the inner peripheral surface of the cog-forming rubber layer having the convex portions and the concave portions alternately at predetermined intervals along the circumferential direction. The jacket covered with the canvas is surrounded by the outer cover, and the mother die and the outer cover are laminated and integrated in a belt sleeve manufacturing jacket. After the vulcanization, the master having the convex portion and the concave portion is peeled off. The work is also facilitated, the heat shrinkage deformation of the matrix during vulcanization is reduced, the number of uses can be increased, and there is the effect that the material cost can be reduced.

According to the second aspect of the present invention, a cylindrical tooth jointed to an engraving drum provided with grooves and teeth extending in the longitudinal direction on the circumferential surface alternately along the circumferential direction. After covering the canvas, wrapping a rubber layer to be a cog-forming rubber layer thereon, and further wrapping a rubber layer to be an outer cover to form a molded body, a flange is provided on at least one end edge of the molded body. After vulcanizing this, it is a method of manufacturing a jacket for producing a belt sleeve that is extracted from an engraving drum, and since no reinforcing canvas is used, the heat shrinkage of the jacket during vulcanization is reduced and the number of uses is increased. You can get a jacket that can.

According to the third aspect of the present invention, since the rubber layer serving as the cog-forming rubber layer and the rubber layer serving as the outer cover are made of the same material, the cog-forming rubber layer and the outer cover are separated. And the time for forming the cog-forming rubber layer and the outer cover can be shortened.

In the invention of claim 4 of the present application, since the jointed cylindrical toothed canvas is easily expanded and contracted in the circumferential direction, the rubber layer of the cog-forming rubber layer is used to form the toothed canvas into the grooved shape of the engraving drum. There is an effect that it is easy to penetrate into the inside, and a cog portion of an accurate shape can be formed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a belt sleeve manufacturing jacket according to the present invention.

FIG. 2 shows a manufacturing process of the jacket according to the present invention,
It is a figure showing the state where the cloth for cloth is covered on the engraving drum.

FIG. 3 shows a manufacturing process of the jacket according to the present invention,
It is a figure which shows the state which has wound the rubber layer used as a cog formation rubber layer, and the rubber layer used as an outer cover on the engraving drum.

FIG. 4 is a view showing a step of producing a low-edge double cog belt sleeve, in which a molded body is produced on a mold.

FIG. 5 is a sectional view of a support table used.

FIG. 6 is a perspective view showing a step of installing a mold on a support table.

FIG. 7 is an enlarged view of a portion A in FIG. 6;

FIG. 8 is an enlarged view of a portion B in FIG. 6;

FIG. 9 is a perspective view showing a state where a jacket according to the present invention is inserted along a guide rod.

[Explanation of symbols]

 Reference Signs List 30 jacket 31 master mold 32 outer cover 34 concave portion 35 convex portion 36 toothed canvas 37 cog-forming rubber layer 50 engraving drum

Claims (4)

[Claims] 1. A core wire is embedded in a spiral in a rubber layer,
A jacket used to produce a vulcanized belt sleeve of a cylindrical body having a cog portion on at least the outer peripheral surface side of the rubber layer, and has convex portions and concave portions at predetermined intervals along a circumferential direction. A jacket for producing a belt sleeve, wherein a mother mold in which the inner peripheral surface of a cog-forming rubber layer having alternating layers is covered with a toothed canvas is surrounded by an outer cover, and the mother mold and the outer cover are laminated and integrated. . 2. A core wire is embedded in a spiral in a rubber layer,
In a method for manufacturing a jacket used for producing a vulcanized belt sleeve of a cylindrical body having a cog portion disposed at least on an outer peripheral surface side of a rubber layer, a groove portion and a tooth portion extending in a longitudinal direction on a circumferential surface are provided. After covering the engraved drum provided alternately along the circumferential direction with a jointed cylindrical toothed canvas, wrapping a rubber layer which becomes a cog-forming rubber layer thereon, and further a rubber which becomes an outer covering body A method for producing a jacket for producing a belt sleeve, comprising: winding a layer into a molded body; providing a flange on at least one edge of the molded body; vulcanizing the flange; and removing the flange from an engraving drum. 3. The method according to claim 2, wherein the rubber layer serving as the cog-forming rubber layer and the rubber layer serving as the outer cover are made of the same material. 4. The method according to claim 2, wherein the jointed cylindrical tooth canvas easily expands and contracts in the circumferential direction.