JP2000280371A - Manufacture of belt with toothed double sides and mold apparatus used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a belt with toothed double sides having the steps of simultaneously forming a lower toothed portion on an outer periphery of an inner mold and an upper toothed portion on an inner periphery of an outer mold in the step of vulcanizing to mold one time by using a vulcanizing pan. SOLUTION: In the mold apparatus, a tooth cloth and an unvulcanized rubber sheet are wound on an outer periphery of an inner mold 21, a core wire is spirally spinned thereon, the cloth is further wound on the rubber sheet to form an unvulcanized belt sleeve. Two or above split molds are radially associated with an outer periphery of the sleeve, and an outer mold 23 having an integral toothform as a whole is externally inserted. The thus assembled integral mold apparatus 20 is inserted fixedly into a predetermined vulcanizing pan, covered from its exterior with a rubber jacket in a sealed state, and toothforms of both the surfaces are simultaneously formed in one time vulcanizing step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a double-sided toothed belt and a mold apparatus used for the same, and more particularly, winds a tooth cloth along an outer periphery of an inner mold having a tooth shape on its outer peripheral surface. , Wrap a cord wire on it spirally,
Further, an unvulcanized rubber sheet and a tooth cloth are wound.

[0002] A plurality of split molds are assembled in a cylindrical shape from the outside of the obtained unvulcanized belt sleeve, and an outer mold integrated as a whole is externally inserted into the unvulcanized belt sleeve. The present invention relates to a method of manufacturing a double-sided toothed belt by inserting and fixing the integrated mold apparatus thus obtained in a predetermined vulcanizer, heating under pressure, and a mold apparatus used therefor.

[0003]

2. Description of the Related Art Among the double-sided toothed belts, a double-sided toothed belt made of cast polyurethane is formed by a casting method, so that even a mold having a toothed portion can be easily attached and detached. Therefore, the manufacturing method is already established.

[0004] However, in the method of manufacturing a double-sided toothed belt made of rubber, since the tooth profile is formed by vulcanization using an unvulcanized rubber sheet and a tooth cloth, a mold having a tooth profile is attached. However, it is difficult to remove, and it has not been possible to simplify this manufacturing process until now.

[0005] A method of manufacturing a double-sided toothed belt made of rubber is disclosed in Japanese Patent Publication No. 2-16695, for example, by disposing a tooth cloth along the outer periphery of an inner mold having a tooth shape on its outer peripheral surface. Wrap, spirally wrap the cord rope on top of it, then mount the belt molded body around which the unvulcanized rubber sheet is wrapped in a predetermined vulcanized can, and cover the outer peripheral surface of the belt tightly with a jacket. Then, heating and pressurizing through a jacket, the first step of forming a tooth profile on one side, and the back rubber layer of the vulcanized belt sleeve with single-sided teeth obtained in this manner is subjected to a predetermined process so that the core wire rope is not exposed. Polishing while leaving the thickness, laminating adhesive and unvulcanized rubber sheet, and tooth cloth, and then pressurizing and heating using a pair of upper and lower toothed press dies, and the other side To form a tooth profile. Next, the vulcanized portion is moved to form a tooth profile at a subsequent portion.

This is a method for manufacturing a double-sided toothed belt, which comprises a second step of forming a double-sided tooth profile around the entire circumference by repeating this.

Another method is disclosed in Japanese Patent Publication No. 6-431.
As disclosed in Japanese Patent Application Publication No. 06-2006, a tooth cloth is wound along the outer periphery of an inner mold having a tooth shape on an outer peripheral surface thereof, and a core wire rope is wound thereon in a spiral shape, and an unwound portion is wound thereon. An unvulcanized belt sleeve around which a vulcanized rubber sheet and a tooth cloth are wound is fixed to a vulcanizing can, the outer peripheral surface of which is covered with a jacket in a hermetically sealed state. A first step of manufacturing a belt sleeve with a belt, removing the semi-vulcanized belt sleeve from a vulcanizing can, and pressing and heating the belt sleeve using a pair of upper and lower toothed press dies to form a tooth profile on the other surface. To form This is a method for manufacturing a double-sided toothed belt, which comprises a second step of sequentially moving the vulcanized portion to form a tooth profile at a subsequent portion and forming a tooth profile around the entire circumference.

Here, semi-vulcanization refers to a state where each physical property value reaches 1 to 5% when each physical property value such as tensile strength, modulus, elongation, etc. at the time of optimum vulcanization is 100. To tell.

[0009]

However, in each of the above methods, a tooth profile is formed on only one surface by vulcanization using a vulcanizing can. Therefore, it is necessary to form a tooth profile on the other surface again. was there. For this, a large number of vulcanizations by a press die are required, so that much time and labor are required.

Further, in the vulcanization using a press die, since the pitch feed is repeated for the length of the press, it is inevitable that the vulcanization will partially overlap, and this part will be over vulcanized, and this will cause over vulcanization during actual use. Rubber aging and premature rubber failure sometimes occurred.

[0011] Above all, the method of polishing the back rubber layer of the vulcanized belt sleeve not only adds a new polishing step, but also causes an earlier bonding process due to the adhesive force between the vulcanized rubber and the unvulcanized rubber. Interfacial peeling may occur.

The present invention is intended to solve such a problem, and simultaneously forms a tooth profile on both surfaces of an unvulcanized belt sleeve by one vulcanization. An accurate tooth profile can be developed and manufacturing time can be reduced.

[0013]

According to the first aspect of the present invention, a plurality of upper teeth and lower teeth are formed in the length direction, and a core wire rope is buried between the teeth to form the upper teeth. And a method of manufacturing a double-sided toothed belt in which the surface of the lower tooth portion is covered with a tooth cloth, a step of forming an unvulcanized belt sleeve on the outer peripheral surface of a cylindrical inner mold having a tooth profile on the outer peripheral surface thereof, An outer mold having a tooth profile on an inner peripheral surface thereof on an outer peripheral surface of an unvulcanized belt sleeve, and a plurality of split molds divided into at least two in a circumferential direction are ring-shaped so as to face the inner mold. Installing on a spacer and assembling it into a mold apparatus, fixing the mold apparatus to a vulcanization can, extrapolating a jacket around the outer peripheral surfaces of the plurality of split molds in a substantially sealed state, The plurality of split dies are moved toward the center through the ring spacer. Stopping the movement and vulcanizing the unvulcanized belt sleeve into a predetermined shape, and disassembling and removing the vulcanized double-sided belt sleeve by disassembling the plurality of split molds. Cutting the belt sleeve to a predetermined width to obtain a predetermined double-sided toothed belt.

According to a second aspect of the present invention, a plurality of upper teeth and lower teeth are formed in the length direction, and a core wire rope is buried between the teeth, and the surfaces of the upper teeth and lower teeth are formed. A method of manufacturing a double-sided toothed belt coated with a tooth cloth, a step of forming an unvulcanized belt sleeve on an outer peripheral surface of a cylindrical inner mold having a tooth profile on an outer peripheral surface thereof; On the outer peripheral surface, a plurality of split molds, each of which is an outer mold having a tooth profile on its inner circumferential surface and can be divided into at least two in the circumferential direction, are installed on a ring spacer so as to face the inner mold. A step of assembling into a mold apparatus, once fixing the mold apparatus to a vulcanizing can, extrapolating a jacket to the outer peripheral surface of a plurality of split molds in a substantially sealed state, and passing the plurality of Move the split mold toward the center and use a ring spacer to move the split mold. Stopping and heating the belt sleeve until it is in a semi-vulcanized state, and in the semi-vulcanized state of the belt sleeve, moving a plurality of split dies inward to pressurize the semi-vulcanized belt sleeve, Further heating the pressurized state to completely vulcanize the belt sleeve, disassembling the vulcanized double-sided toothed belt sleeve by disassembling the plurality of split molds, and removing the vulcanized belt. Cutting the belt sleeve to a predetermined width to obtain a predetermined double-sided toothed belt.

According to a third aspect of the present invention, a plurality of upper teeth and lower teeth are formed in the length direction, and a cord rope is embedded between the teeth.
What is claimed is: 1. A mold apparatus for manufacturing a double-sided toothed belt in which a surface of said upper tooth part and lower tooth part is covered with a tooth cloth, said mold apparatus having a cylindrical inner mold having a tooth profile on an outer peripheral surface thereof. A plurality of split molds which are arranged at positions facing the inner mold and are divided into at least two or more parts having a tooth profile on the inner peripheral surface thereof; installing the split mold and stopping the movement thereof for positioning. And a ring spacer having a function.

According to a fourth aspect of the present invention, there is provided a mold apparatus for producing a double-sided toothed belt according to the third aspect, further comprising means for pressing the belt sleeve by moving the split mold inward.

According to a fifth aspect of the present invention, the ring spacer comprises:
The mold used for manufacturing the double-sided toothed belt according to claim 3 or 4, which is interposed between the inner molds at both ends where no tooth shape is formed and the plurality of split molds and is fixed to the inner mold. Device.

According to a sixth aspect of the present invention, the means for positioning the inner mold and the plurality of split molds in the circumferential direction is a key means.
6. The mold apparatus according to any one of items 1 to 5.

According to a seventh aspect of the present invention, the means for moving the split mold inward includes a tapered portion provided on an outer peripheral surface of an end portion of the split mold, and an inner peripheral surface of a color ring fitted into the end portion of the split mold. And the taper portion provided on the front side is brought into contact with each other, and by moving the color ring in the axial direction of the split mold, the split mold is configured to move inward by the action of the two tapered portions. It is characterized by having.

1 and 2, a cylindrical inner mold 21 having a toothed portion on the outer peripheral side and a concentric cylindrical outer mold 23 having a toothed portion on the inner peripheral side are constructed as shown in FIGS. Are formed in a predetermined order in the gap portion between the core body rope 11, the unvulcanized rubber sheet 12, and the tooth cloth 13, and are heated under pressure in this state. As a result, the unvulcanized rubber member fluidizes in a closed state, and faithfully reproduces the tooth shape engraved on the inner surface of the mold.

Therefore, at the time of molding, the bulk (rolling shape) of the unvulcanized rubber member becomes a neck, and it is not possible to insert the ring-shaped outer mold 23 in a ring shape from one side and mount it.

Further, after vulcanization, the residual internal stress of the vulcanized rubber becomes a bottleneck, and it is difficult to pull out either the inner mold 21 or the outer mold 23 from each other in a ring shape and remove it. is there.

However, the outer mold 23 can be divided in the circumferential direction, and can be assembled from two or more split dies in the radial direction. Thereby, the integral outer mold 23 can be attached and detached as a whole.

Further, there is provided a means for pressing the belt sleeve by moving the split mold inward as claimed in claim 2 or claim 4. The belt sleeve once heated to be in a semi-vulcanized state is provided. By pressing with a split mold having a tooth mold on the inner surface, the tooth mold can be accurately formed by the belt sleeve.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing a double-sided toothed belt according to the present invention will be described below with reference to the drawings. FIG. 1 is an assembly sectional view of a mold apparatus according to the present invention.
It is characterized in that a double-sided toothed belt is manufactured using this mold apparatus 20.

In FIG. 1, a mold apparatus 20 of the present invention comprises an inner mold 21, a lower base ring 22, an outer mold 23 composed of a split mold, an upper base ring 24, and a color ring 2.
5. It is constituted by a member comprising the fixing ring 26, and is characterized in that the outer mold 23 is constituted by a split mold which can be divided in the circumferential direction.

In FIG. 2, the inner mold 21 is a cylindrical grooved mold having a toothed portion on the outer peripheral surface at a substantially central portion thereof. This inner mold 21 is installed in a predetermined molding machine (not shown), and has an expandable and contractible cylindrical tooth cloth 13 on the inner mold 21 having a tooth profile on its outer peripheral surface, and a certain thickness for forming a lower tooth portion. After the unvulcanized rubber sheet 12 is laminated, the core wire 11 is spirally wound under a constant tension.

Further, an unvulcanized rubber sheet 12 having a predetermined thickness and a tooth cloth 13 forming another upper tooth portion are further laminated thereon,
The unvulcanized belt sleeve is completed on the inner mold 21.

Thereafter, the inner mold 21 is removed from the molding machine and set on a mold assembly table (not shown). An outer mold 23 having a tooth profile on the inner peripheral surface is externally sealed to the outer peripheral portion of the unvulcanized belt sleeve.

At this time, since the outer mold 23 of the present invention can be divided in the circumferential direction, a plurality of split molds can be sequentially assembled from the outside in the radial direction and extrapolated.

Next, a process of assembling the mold apparatus 20 using the mold assembly table (not shown) will be described in detail. First, the lower base ring 22 shown in FIGS. 3 and 4 is fixed to the lower part of the inner mold 21 using the positioning key 22k.

Inside the lower base ring 22, the above-mentioned positioning key 22k for circumferential alignment with the inner mold 21 is previously mounted at a predetermined position, and outside the lower base ring 22, there is an external key. Positioning keys 23k for regulating the circumferential positions of the plurality of split dies fitted to the dies are similarly attached.

The not-shown inner groove shown in FIG. 3 is for forming a passage for removing air when vulcanizing a double-sided toothed belt.

Next, the upper base ring 24 shown in FIGS. 8 and 9 is fixed on the inner die 21 by using a key groove 24s. At this time, the positioning key 24k to be fitted into the key groove 24s is previously mounted at a predetermined position on the inner die 21 as shown in FIG.

The inner grooves not shown in FIG. 9 are used to form passages for removing air during vulcanization, and the positioning keys 23 fixed to the outside are also used.
k is for regulating the circumferential positions of the plurality of split dies similarly fitted to the outside.

Next, a method of assembling the outer mold on the unvulcanized belt sleeve laminated on the tooth profile of the inner mold 21 will be described. This outer die is characterized in that it can be divided into a plurality of split dies in the circumferential direction, whereby the unvulcanized belt sleeve can be externally inserted and fixed in a sealed state from the outside.

FIG. 5 shows an outer mold according to the present invention. After assembling, an integral outer mold 23 is formed, and before assembling, the outer mold 23 is radially radially extended from the center by 10 mm. The figure shows ten equally divided mold dies. 6 is a sectional view taken along the line BB of FIG. 5, and FIG. 7 is a sectional view taken along the line CC of FIG.

Each of the ten split dies which are divided into ten equal parts in FIGS. 5, 6 and 7 and have a gutter-like appearance as a whole has a toothed portion substantially inside the center thereof. A keyway 23s for positioning with the inner mold 21 is provided in the upper and lower portions on the inner side in the axial direction.

The ten split dies are firstly provided with a positioning key 2 mounted on the outer peripheral side of the upper base ring 24.
It is guided by 3k and assembled so as to cover the unvulcanized belt sleeve from the radial direction. At the same time, it is inserted into the concave portion provided in the circumferential direction of the lower base ring 22 shown in FIGS. 1 and 4, and is fixed vertically. Thereafter, the bundle is temporarily fixed substantially in a fitted state by a bundle collecting device (not shown).

In this state, the color ring 25 shown in FIG. 10 is extrapolated from above the inner mold 21 so as to fix the split mold at a predetermined position. In this fixing method, the ring-shaped end of the split mold is fixed to the concave portion of the lower base ring 22 when the ring-shaped end is at the lower portion, and is fixed to the concave portion of the color ring 25 at the upper portion.

The positioning accuracy in the radial direction that determines the accuracy of the PLD of the double-sided toothed belt depends on the thickness of the upper base ring 24 and the lower base ring 22 having a ring spacer function. Is a clearance fit. Finally, the fixing ring shown in FIG. 11 is fixed from above the collar ring 25 in a manner of being tightened in the axial direction.

When the above assembling step is completed, the above-mentioned mold apparatus 20 is installed in a vulcanized can (not shown) by a predetermined conveying means, with the unvulcanized belt sleeve built therein.

This vulcanized can is generally used for vulcanization of a transmission rubber belt, and includes a toothed belt,
It is used for belts, V-ribbed belts, flat belts and the like.

The mold apparatus is placed in a vulcanizing can, and a rubber jacket is hermetically covered outside the unvulcanized belt sleeve. When pressurized and heated in this state, the split mold is pressed against the inner mold 21 via the rubber jacket. At this time,
Since the upper base ring 24 and the lower base ring 22 function as ring spacers, the positioning is determined, and a predetermined double-sided toothed sulfur belt belt is completed through a vulcanization process.

Finally, the vulcanized belt sleeve is removed from the vulcanized can, and a double-sided toothed belt having a predetermined belt width is manufactured using a cutting machine (not shown).

In the above process, the unvulcanized rubber sheet 1
Rubber elastomers used for the rubber 2 include hydrogenated nitrile rubber, chloroprene rubber, chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM) and other rubbers with improved heat aging resistance, and natural rubbers. It is a rubber elastomer composed of rubber, styrene butadiene rubber, nitrile rubber and the like.

The compounding agents used in the rubber are carbon black, zinc white, stearic acid, a plasticizer and an antioxidant, and the vulcanizing agents are sulfur and organic peroxides.
These compounding agents and vulcanizing agents are not particularly limited.

As the inorganic fibers used for the core wire 11, twisted filaments of 5 to 9 μm of E glass or high-strength glass are used with a rubber compound protecting agent or RFL liquid as an adhesive. The processed one is used.

As the organic fiber, a 0.5 to 2.5 denier filament of para-aramid fiber (trade name: Kevlar, Technora) having a small elongation with respect to stress and a high tensile strength is twisted, and an RFL solution is used. A twisted cord treated with an adhesive of an epoxy solution, an isocyanate solution and a rubber compound is used. However, the present invention is not limited to these.

The canvas used as the tooth cloth 15 is nylon 6, nylon 66, polyester, or aramid fiber 3, and may be used alone or in combination.
The configuration of the warp (belt width direction) or the weft (belt length direction) of the tooth cloth 13 is also a filament yarn or a spun yarn of the fiber, and the woven configuration may be any of a plain woven fabric, a twill woven fabric, and a satin woven fabric. It is preferable that a part of urethane elastic yarn having elasticity is used for the weft.

Further, in order to prevent the rubber component oozing out on the surface of the tooth portion from scattering as rubber powder during running of the belt, the tooth cloth 13 is treated only with the RFL solution, and the RFL solution is dried. The obtained RFL solution having a solid content of 10 to 50% by weight can be appropriately used.

This RFL solution is obtained by mixing a latex with an initial condensate of resorcinol and formalin, and the molar ratio of resorcinol to formalin is 1 to 1 to 3.
Examples of the latex used here include latexes such as styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, and epichlorohydrin.

On the inner surface of the tooth cloth 13 treated with the RFL liquid, a rubber paste obtained by dissolving a rubber composition mainly composed of a rubber elastomer used for both upper and lower teeth portions in a solvent is spread (coating treatment). 100-16
It is dried at a temperature of 0 ° C. for 30 to 60 seconds to form a tooth cloth 13 having a rubber layer of a predetermined thickness.

Next, FIG. 14 is an assembled sectional view corresponding to FIG. 1 of a mold apparatus used in the manufacturing method according to the second aspect. According to the second aspect, the following steps are added for more accurately expressing the tooth profile on the outer peripheral surface of the belt sleeve.

In the steps of the manufacturing method described above, the unvulcanized belt sleeve 12 is set in the inner mold 21 and the split mold 23
Is placed, the mold apparatus is once placed in the vulcanization can, the jacket is covered, heating is started, and the unvulcanized belt sleeve 12 is brought into a semi-vulcanized state. Then, while the belt sleeve is in a semi-vulcanized and softened state, the collar ring 25 fitted to both axial ends of the split mold 23 is moved in the axial direction (in the direction of the single arrow in FIG. 15) to move the split mold inward. (In the direction of the double arrow in FIG. 15), and the semi-vulcanized belt sleeve is pressed by the split mold 23 to form a tooth profile.

At both ends of the split mold, the outer peripheral surface 27 is tapered, and the inner peripheral surface 28 of the color ring 25 is also tapered. The bolts 29 to be tightened are further tightened, and the collar ring 25 moves in the axial direction (in the direction of the single arrow in FIG. 15), so that the split mold 23 moves inward (in the direction of the double arrow in FIG. 15) by the action of the tapered surface. Is configured.

As described above, the belt sleeve is once softened in a semi-vulcanized state, and is pressed by an outer split mold, whereby the tooth profile of the outer peripheral surface of the belt sleeve, which tends to be inaccurate, is obtained. Very accurate and accurate shaping is possible.

The movement of the split mold utilizing the action of the bolt 29 and the tapered surface is merely an example of the present invention, and for example, a hydraulic device is provided and the coloring ring 25 is provided.
Method of moving the split mold by the action of the tapered surface via
It is also possible to adopt a method of directly moving the split mold using a hydraulic device.

[0059]

EXAMPLES The double-sided toothed belt used in the examples has 66
After weaving a 2/2 twill canvas with a warp yarn made of nylon and a weft made of wooly 6 nylon, a rubber paste is applied to the inside of the treated tooth cloth to a predetermined thickness and dried to form a rubber layer. An aramid fiber cord having a diameter of 0.7 mm was used for the core wire 11.

The above-mentioned cloth 13 is finished into a cylindrical sleeve, which is set in an inner mold 21, and an unvulcanized sheet 12 of a predetermined thickness made of a chloroprene rubber compound is wound thereon, and the cloth 13 is wound thereon. S, Z A pair of glass fiber cords are wound so as to be alternately arranged at a spinning pitch of 0.87 mm, and further, an unvulcanized sheet 12 of a predetermined thickness made of a chloroprene rubber compound is wound therefrom. 13 was wound to form an unvulcanized belt sleeve on the inner mold 21.

Next, this unvulcanized belt sleeve was placed in a predetermined vulcanizing can (not shown), and the unvulcanized belt sleeve was heated under pressure to produce a predetermined vulcanized belt sleeve.

The vulcanized belt sleeve was removed and cut to a predetermined width. The resulting double-sided toothed belt had a tooth profile of the belt: special tooth profile, tooth profile pitch: 3 mm, number of teeth: 230,
PLD: 1.5mm, vulcanized belt sleeve width: 300m
m. As a result, the shape of the belt teeth after molding and vulcanization was good, the upper teeth and the lower teeth were at the same position, and the upper and lower PLD values were also the same.

The used mold device 20 has a mold height: 625 mm, a mold outer diameter: 254 mm, and a tooth profile length:
300 mm, outer diameter of the tooth profile of the inner mold 21: 216.63 m
m, the inner diameter of the tooth shape portion of the outer mold 23: 222.63 mm, the mold pitch diameter 219.6 mm, and the outer mold 23: 10 equally divided (10
It is composed of individual split molds. ) Was used.

In the present embodiment, the number is divided into ten equal parts. However, the present invention is not limited to this, and any part that can be divided into two or more parts can be used as appropriate.

[0065]

According to the first aspect of the present invention, the outer mold is equally divided radially from the center thereof in the radial direction, so that the outer mold can be mounted in the radial direction. This makes it possible to manufacture a double-sided toothed belt by a single vulcanization, which has been impossible with a single vulcanization, which has a great effect on shortening the process.

Further, since the upper teeth and the lower teeth can be simultaneously molded, the pitch line of the core wire is stabilized, and the PLD and belt length accuracy are improved. Further, since the pitch phase of the upper tooth portion and the lower tooth portion is stabilized, the meshing of the teeth is improved during use.

According to the second aspect of the present invention, the split mold is configured to be movable, and the split mold is moved and pressurized while the unvulcanized belt sleeve is heated to be semi-vulcanized. The tooth shape of the sleeve can be more accurately formed.

According to the third aspect of the present invention, the outer mold can be disassembled into two or more split molds, and as a result, a double-sided toothed belt can be manufactured.

According to a fourth aspect of the present invention, the split mold is configured to be movable inward, and the split mold is moved and pressurized in a state where the unvulcanized belt sleeve is heated and semi-vulcanized. Therefore, the tooth shape of the belt sleeve can be more accurately formed.

[0070] The fifth aspect of the present invention relates to a ring spacer.
However, since the split mold is positioned at both ends, the assembly accuracy of the cavity space formed between the inner mold and the split mold is improved. Thereby, the thickness accuracy of the double-sided toothed belt, P
This has the effect of improving the accuracy of the LD.

According to the sixth aspect of the present invention, the positioning of the adjacent split dies can be easily and accurately achieved by the key means, so that there is an effect of eliminating disturbance of the tooth shape of the die joint.

According to a seventh aspect of the present invention, the moving means of the split mold is a color ring using a tapered surface, and the split mold can be easily moved by tightening a bolt or the like.

[Brief description of the drawings]

FIG. 1 is an assembled sectional view of a mold device according to the present invention.

FIG. 2 is a sectional view of an inner mold according to the present invention.

FIG. 3 is a plan view of a lower base ring according to the present invention.

FIG. 4 is a sectional view taken in the direction of arrows in FIG. 3A-A.

FIG. 5 is a plan view of an outer mold according to the present invention.

6 is a sectional view taken along the line BB of FIG. 5;

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a sectional view of an upper base ring according to the present invention.

FIG. 9 is a sectional view taken along the line EE in FIG. 8;

FIG. 10 is a sectional view of a coloring according to the present invention.

FIG. 11 is a sectional view of a fixing ring according to the present invention.

FIG. 12 is an enlarged view of a portion D in FIG. 7;

FIG. 13 is a perspective view of a double-sided toothed belt according to the present invention.

FIG. 14 is an assembled sectional view corresponding to FIG. 1 showing an example according to claim 2;

FIG. 15 is a cross-sectional view of a main part showing a manner in which a split mold is moved by coloring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Double-sided toothed belt 11 Core wire 12 Rubber layer 13 Tooth cloth 20 Mold device 21 Inner die 22 Lower base ring (Ring spacer) 23 Outer die 24 Upper base ring (Ring spacer) 25 Color ring 26 Fixed Ring 27 Outer peripheral surface 28 Inner peripheral surface 29 Bolt

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 105: 24 B29L 29:00 F term (Reference) 4F202 AA29 AA46 AD04 AD15 AD16 AG03 AG16 AJ08 AP02 AP05 AR02 AR06 CA03 CB01 CB20 CB22 CB29 CC10 CK17 CK53 CK59 4F203 AA29 AA46 AD04 AD15 AD16 AG03 AG16 AJ08 AP02 AP05 AR02 AR06 DA02 DA11 DB01 DB18 DC04 DD02 DE06 DE16 DF01 DF05 DF06 DH06 DK02 DL10 DL14 DM10 DW06 ADW AA4A14A46 AR02 AR06 WA03 WA43 WA54 WA63 WA87 WB01 WB18 WB22 WC01 WE01 WE06 WF05 WF06 WK01 WK03 WW02 WW15 WW23 WW33

Claims (7)

[Claims] 1. A plurality of upper teeth and lower teeth are formed in a length direction, a core wire rope is buried between the teeth, and a surface of the upper teeth and lower teeth is covered with a tooth cloth. Forming a non-vulcanized belt sleeve on the outer peripheral surface of a cylindrical inner mold having a tooth profile on the outer peripheral surface thereof, and forming the unvulcanized belt sleeve on the outer peripheral surface of the unvulcanized belt sleeve. A plurality of split dies, each having at least two circumferentially divided outer dies having a tooth profile on an inner peripheral surface, are installed on a ring spacer so as to face the inner dies and assembled into a die apparatus. Fixing the mold apparatus to a vulcanizing can, extrapolating a jacket on the outer peripheral surface of the plurality of split molds in a substantially sealed state, and centering the plurality of split molds through the jacket in a central direction. To the unvulcanized belt slot. Vulcanizing the sleeve into a predetermined shape, disassembling the vulcanized double-sided toothed belt sleeve by disassembling the plurality of split molds, and cutting the removed belt sleeve to a predetermined width. And a step of obtaining a predetermined double-sided toothed belt. 2. A plurality of upper teeth and lower teeth are formed in the length direction, a core wire rope is buried between the teeth, and the surface of the upper teeth and lower teeth is covered with a tooth cloth. Forming a non-vulcanized belt sleeve on the outer peripheral surface of a cylindrical inner mold having a tooth profile on the outer peripheral surface thereof, and forming the unvulcanized belt sleeve on the outer peripheral surface of the unvulcanized belt sleeve. A plurality of split dies, each having at least two circumferentially divided outer dies having a tooth profile on an inner peripheral surface, are installed on a ring spacer so as to face the inner dies and assembled into a die apparatus. Once the mold apparatus is fixed to the vulcanization can, the jacket is externally inserted into the outer peripheral surfaces of the plurality of split dies in a substantially sealed state, and then the belt sleeve is heated until it is in a semi-vulcanized state. And moving the plurality of split dies inward in the semi-vulcanized state of the belt sleeve. Pressurizing the semi-vulcanized belt sleeve by heating, further heating the pressurized state to completely vulcanize the belt sleeve, and vulcanizing the double-sided toothed belt sleeve with the plurality of split molds. A method for producing a double-sided toothed belt, comprising: disassembling and removing; and cutting the removed belt sleeve to a predetermined width to obtain a predetermined double-sided toothed belt. 3. A plurality of upper teeth and lower teeth are formed in the length direction, a cord rope is buried between the teeth, and a surface of the upper teeth and lower teeth is covered with a tooth cloth. A mold device for producing a double-sided toothed belt, comprising: a cylindrical inner mold having a tooth profile on an outer peripheral surface thereof; and an inner periphery disposed at a position facing the inner mold. A plurality of split molds divided into at least two or more parts having a tooth profile on a surface, and a ring spacer having a function of installing the split mold and stopping its movement to perform positioning. Mold apparatus used for manufacturing a double-sided toothed belt. 4. A means for pressing the belt sleeve by moving the split mold inward.
A mold apparatus for use in manufacturing the double-sided toothed belt described in the above. 5. The ring spacer according to claim 3, wherein the ring spacer is interposed between the inner dies at both ends where no tooth profile is formed and the plurality of split dies, and is fixed to the inner die. A mold device used to manufacture double-sided toothed belts. 6. A mold apparatus used for manufacturing a double-sided toothed belt according to claim 3, wherein the means for positioning the inner mold and the plurality of split molds in the circumferential direction is key means. . 7. A means for moving the split mold inward is provided on a taper portion provided on an outer peripheral surface of an end portion of the split mold and on an inner peripheral surface of a color ring fitted into the end portion of the split mold. The split die is configured to move inward by the action of both tapered portions by causing the collar ring to move in the axial direction of the split die by abutting against the tapered portion and abutting against the tapered portion. A mold apparatus used for manufacturing the double-sided toothed belt according to any one of 3 to 6.