JP3331295B2 - Manufacturing method of double-sided toothed belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a double-sided toothed belt. It relates to a manufacturing method.

[0002]

2. Description of the Related Art A double-sided toothed belt having teeth on both sides is provided with a plurality of upper teeth and lower teeth arranged along the length direction.
A cord is interposed between the upper teeth and the lower teeth, and the surface of the upper and lower teeth is covered with a cloth, and is used for office equipment, OA equipment, and transport equipment. It has become.

A method of manufacturing this double-sided toothed belt is disclosed in, for example, Japanese Patent Publication No. 6-43106, in which a tooth cloth is wound along the outer peripheral surface of a grooved mold, and a core wire is spirally wound thereon. the winding further winding an unvulcanized rubber sheet and the like of the tooth cloth thereon and in this way the belt molded body obtained by heating and pressing to create a half-vulcanization of the preform, with the grooves The preform taken out of the mold is hung on two toothed pulleys whose axial distance can be adjusted, and the preform is pressurized by a press die composed of a pair of upper and lower toothed molds to press the preform and upper teeth and lower teeth. The vulcanization was carried out by molding and vulcanizing the portion, moving the vulcanized portion, and repeatedly forming and vulcanizing the next tooth portion.

As another method, Japanese Patent Publication No.
As disclosed in Japanese Patent No. 695, a tooth cloth is wound along the outer peripheral surface of a grooved mold, a core wire is spirally wound thereon, and an unvulcanized rubber sheet is further wound thereon. The obtained belt molded body was heated and pressurized to prepare a vulcanized preformed body, and the back rubber of this preformed body was polished leaving a rubber layer of 0.2 mm or less so that the core wire was not exposed, The step of laminating an unvulcanized rubber sheet and a tooth cloth thereon and heating and pressurizing with a mold were performed.

[0005]

However, in the above-described method for manufacturing a double-sided toothed belt, the semi-vulcanized preform has a tooth portion formed on only one side. In order to form the part, a pressing mold requires a larger pressing force and a longer time, and in some cases, as a result of vulcanization, an accurate tooth profile is difficult to appear. In the method of polishing the back rubber vulcanized preform, polishing process is added, moreover polishing accuracy it has required much time polishing time in order is required.

The present invention has been made in order to solve the above-mentioned problems, and provides an upper tooth portion and a lower tooth portion at accurate positions, allows an accurate tooth profile to appear, and reduces molding time. An object of the present invention is to provide a method for manufacturing a toothed belt.

[0007]

That is, according to the first aspect of the present invention, a plurality of upper teeth and lower teeth are arranged along the longitudinal direction, and the upper teeth and the lower teeth are connected to each other. A method of manufacturing a double-sided toothed belt in which a core wire is interposed between the upper and lower teeth portions and the surface of the upper and lower teeth portions is covered with a tooth cloth, wherein a tooth cloth, a core wire, and an unvulcanized rubber sheet And a step of manufacturing a molded body in which tooth cloths are sequentially laminated, and inserting a cylindrical matrix having alternately convex portions and concave portions at predetermined intervals along the circumferential direction into the molded body to adjust the position. Process, preliminary vulcanization process to semi-vulcanize the molded body and mold both upper and lower teeth, and heat and press the semi-vulcanized belt sleeve taken out of the grooved mold to accurately mold both upper and lower teeth. In the method of manufacturing a double-sided toothed belt consisting of a final molding step of In the pre-molding process, the upper and lower teeth are formed at accurate positions on the semi-vulcanized belt sleeve, and in the final pressing process, accurate tooth shapes appear, and the upper and lower PLD values (core pitch line) (Distance from to the bottom of the groove).

In the invention according to claim 2 of the present application, after the step of aligning the upper and lower teeth portions has produced the molded body, one or more guide rods are arranged on the surface of the molded body in parallel with the axial direction of the mold. Then, a cylindrical matrix is inserted along the guide bar to align the position, and the guide bar is removed.In order to use a jig for fixing the position of the matrix, the upper and lower tooth portions are used. Can be set as desired.

According to the third aspect of the present invention, since the plurality of guide rods are arranged at a constant pitch, the position of the matrix can be accurately positioned.

According to the invention described in claim 4 of the present application, one bent end of the guide rod is provided in a locking hole in a side wall provided in a grooved mold, and the other end is provided in a support base. Since the guide rod is inserted into the hole, installation and removal of the guide rod is easy, and the operation can be completed in a short time.

[0011] In the invention according to claim 5 of the present application, the semi-vulcanized belt sleeve is placed in a mold having alternating teeth and grooves at predetermined intervals in a final molding step, and heated and pressurized, and the teeth are precisely formed. This is a method of forming well, and even if the shape of the deformed tooth portion is formed on the semi-vulcanized belt sleeve in the preliminary forming step, it can be accurately formed in the final forming step.

[0012] In the invention according to claim 6 of the present application, the cylindrical matrix has the toothed canvas covering the surfaces of the convex portions and the concave portions provided at predetermined intervals along the circumferential direction. In addition, it is possible to improve the escape of air existing between the matrix and the molded body, thereby enabling accurate appearance of teeth, and increasing the number of times the matrix is used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a double-sided toothed belt according to the present invention will be described below. FIG. 1 is a view showing a production state of a molded body in which a tooth cloth, a core wire, an unvulcanized rubber sheet, and a tooth cloth are sequentially laminated on a grooved mold in a method for producing a double-sided toothed belt. First, the grooved mold 1 is inserted into a molding machine (not shown).
, And the expandable and contractible tubular tooth cloth 5 is inserted into the groove portion 2 and the tooth portion 3.
Is wound along the outer peripheral surface of the grooved mold 1 and the core wire 4 is spirally wound thereunder under a constant tension.
Further, an unvulcanized rubber sheet 7 having a capacity to form both teeth and a constant thickness and a flat tooth cloth 5 are wound thereon to form a molded body 15.

The raw rubber used for the unvulcanized rubber sheet 7 is heat aging resistance such as hydrogenated nitrile rubber, chloroprene rubber, chlorosulfonated polyethylene (CSM), and alkylated chlorosulfonated polyethylene (ACSM). Rubber, natural rubber, styrene butadiene rubber, nitrile rubber and the like are used. Among the above rubbers, as compounding agents, carbon black, zinc white, stearic acid, a plasticizer, an antioxidant, etc. are added, and as a vulcanizing agent, there are sulfur and organic peroxides. The vulcanizing agent is not particularly limited.

The core wire 4 is obtained by twisting filaments of 5 to 9 μm of E glass or high-strength glass and treating them with a rubber compound protective agent or an RFL liquid as an adhesive. . Further, as an organic fiber, a filament of 0.5 to 2.5 denier of a para-aramid fiber (trade name: Kevlar, Technora) having a small elongation with respect to stress and a large tensile strength is twisted, and an RFL solution, an epoxy solution A twisted cord treated with an adhesive of 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 5 is 6 nylon, 66 nylon, polyester, aramid fiber or the like, and may be used alone or in combination. Warp (belt width direction) and weft (belt length direction) of tooth cloth 5
Is a filament yarn or a spun yarn of the above-mentioned fiber, and the woven structure may be any of a plain woven fabric, a twill woven fabric, and a satin woven fabric. In addition, it is preferable to use a part of urethane elastic yarn having elasticity as the weft.

The tooth cloth 5 is treated only with the RFL liquid, and the RFL liquid obtained by drying the RFL liquid has a solid content of 10 to 50% by weight. Is preferred. The solid content of the RFL solution is composed of the solid content of the RF resin and the latex. This is because the rubber oozing out on the surface of the tooth portion is scattered as rubber powder while the belt is running. This RFL solution was prepared by mixing an initial condensate of resorcinol and formalin with latex, and the molar ratio of resorcinol to formalin was 1: 1 to 1
3. The weight percentage of the latex of the initial condensate of resorcinol and formalin is 1: 1 to 10.
The latex used here is a latex such as styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin and the like.

As a specific processing method of the tooth cloth 5,
The canvas is immersed in the RFL liquid, dipped with a pair of rolls at a squeezing pressure of about 0.3 to 0.8 kgf / cm (gauge pressure), dried, and then the RFL liquid is similarly applied.
The solid content of the RFL solution adhering to the canvas was adjusted to 10 to 50% by weight. In the solid adhering amount of RFL solution is less than 10 wt%, the openings will expand the contact portion of the canvas the warp and weft becomes easy to move, which the rubber of the tooth portion 41, 42 or opening of the tooth cloth May be exposed on the tooth surface. On the other hand, if the solid content of the RFL liquid exceeds 50% by weight, there is a problem that the solid content becomes large and the shape of the teeth of the belt does not appear correctly.

On the inner surface of the tooth cloth 5 treated with the RFL solution,
A rubber paste obtained by dissolving a rubber composition mainly composed of raw rubber used for both upper and lower teeth in a solvent is coated by a spreading process (coating process) and dried at a temperature of 100 to 160 ° C. for 30 to 60 seconds. Thus, a rubber layer having a thickness of 0.1 to 0.3 mm is formed. If the thickness of the rubber layer is less than 0.1 mm, the unvulcanized rubber sheet will seep to the surface of the tooth cloth during press vulcanization, and if it exceeds 0.3 mm, the unvulcanized rubber sheet will have a tooth cloth surface. Although the bleeding to the side is prevented, the upper and lower PLD values are different. This is because the rubber layer is deformed because the core wire 4 is wound around the rubber layer of the lower tooth cloth 5. In addition, the tooth cloth 5 coated on the surfaces of the upper and lower teeth portions.
Is preferably coated with a rubber layer on the inner surface in order to make the upper and lower PLD values coincide.

In the positioning step, the grooved 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 are provided.
1 has a holding hole 17 at the center, a plurality of locking holes 18 provided along the circumferential direction, and a small positioning projection 19 provided at a position distant from the center as shown in FIG. ing.

On the other hand, as shown in FIG. 2, the support base 20 has a main projection 21 provided at the center, a locking hole 23 (see FIG. 5) provided on a concentric circle centered on the main projection 21 . It has a pair of alignment projections 22 adjacent to a position away from the center of the main projection.

When the grooved mold 1 is set on the support 20, the main projection 21 provided on the support 20 is inserted into the holding hole 17 of the grooved mold 1, and the positioning projection 19 of the grooved mold 1 is inserted. Is inserted between the adjacent positioning projections 22 of the support base 20, the grooved mold 1 is
Can be fixed correctly and quickly on.

The guide rod 25 is made of metal or synthetic resin, and has a stopper 27 protruding vertically from one bent end 26 and a stopper 28 having a straight and easily removable shape at the other end. The shape is easy to install and remove. As shown in FIGS. 3 to 5, the plurality of guide rods 25 are formed by inserting the stoppers 27 and 28 at both ends into the locking holes 18 provided in the mold 1 and the locking holes 23 provided in the support base 20. Fixed. At this time, the guide rod 25 is in contact with the surface of the molded body 15 or slightly apart.

FIG. 6 shows that after a guide rod 25 is mounted on the surface of the molded body 15, a matrix 30 made of vulcanized rubber is attached to the guide rod 2.
5, the matrix 30 is inserted while the concave portions 31 provided at predetermined intervals along the circumferential direction are fitted into the guide rods 25. The size of the cross section of the guide rod 25 is such that it is completely fitted into the concave portion 31 of the matrix 30 and is slightly smaller than the concave portion 31. The cross-sectional shape is circular, oval, square, or the like, and is not particularly limited.

In the matrix 30, the surfaces of the concave portion 31 and the convex portion 32 are covered with the tooth canvas 36. As the toothed canvas 36, a filament of polyamide fiber such as 6 nylon, 6.6 nylon, 4.6 nylon, 6.10 nylon, 12 nylon, polyester fiber, polyvinyl alcohol, polyethylene, or polypropylene is used for the warp (longitudinal direction). It is a spun yarn such as a yarn or cotton. The composition of this filament yarn is 3 to 10 to 50 denier monofilament.
Twenty-five yarns are aligned and twisted 5 to 30 times / 10 cm in the S or Z direction to give a warp. Or 1
10 to 2 denier aramid fiber filaments
A multifilament yarn obtained by bundling 00 fibers or twisting the bundles can be used. On the other hand, the weft (circumferential direction) is a highly elastic 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 method of manufacturing the matrix 30 is as follows. An unvulcanized rubber sheet of toothed canvas is placed on a flat mold having separately prepared teeth and grooves alternately arranged, and heated and pressed to form a concave. To produce a vulcanized sheet-like laminate having alternating portions and convex portions. After cutting the bottoms of the two concave portions at a predetermined distance of the laminate, apply rubber glue to each end surface so as to form a cylindrical shape and butt them, and rubberize the flat back surface of the joint portion. After laminating the canvas having a predetermined width, the cylindrical mother die 30 is pressed by heating and pressing. Matrix 30
Has convex portions 32 and concave portions 31 alternately at regular intervals on the inner peripheral surface, and covers the surface of the convex portions 32 and concave portions 31 with the tooth canvas 36. The inner peripheral length of the matrix 30 is 10 to 25 mm longer than the outer peripheral length of the molded body.

As another manufacturing method of the matrix 30, for example, a sewing machine joint or a hot joint is provided on an engraving drum in which groove-like portions and tooth-like portions extending in the longitudinal direction on the circumferential surface are alternately provided along the circumferential direction. After covering a cylindrical toothed canvas with a melt joint, an unvulcanized rubber sheet having a predetermined thickness to be a cog-forming rubber layer 37 was wound thereon, and then vulcanized and vulcanized by a usual method. The molded body is released from the engraving drum to form a matrix 30.

Subsequently, after all the guide rods 25 have been extracted, the process proceeds to a pre-molding step in which the molded body 15 is vulcanized by a usual method. In this step, a jacket is inserted into the outside of the matrix 30 to perform semi-vulcanization. The semi-vulcanization is usually carried out by fitting a cylindrical rubber sleeve (not shown) on the outer peripheral surface of the molded body 15, placing it in a vulcanizing can, and introducing steam of 1 to ² kg / cm ² into the can. Will be At this time, the unvulcanized rubber sheet 7 flows due to the heating and pressurizing, and while extending the tooth cloth 5 below the gap between the core wires 4, the groove 2 of the grooved mold 1 is extended.
When the lower tooth portion 42 is formed and the vulcanization can is semi-vulcanized instead of being completely vulcanized, the internal pressure and temperature of the vulcanization can are lowered to set the vulcanization can in a condition where vulcanization does not proceed further.

The above-mentioned semi-vulcanization means a state where each physical property value reaches 1 to 5% when each physical property value such as tensile strength, modulus and elongation at the time of optimum vulcanization is 100. . In this case, as a guide at the time of optimal vulcanization, the tensile strength is a point slightly above the maximum value, the modulus is a point slightly before the maximum value, and the elongation is a point slightly before the minimum value. It is determined from the curve.

Thereafter, after the grooved mold 1 is taken out of the vulcanizing can, the belt sleeve 40 as a preform is removed from the grooved mold 1. In this case, the belt sleeve 40
Is in a semi-vulcanized state, it is necessary to extract the teeth 41 and 42 without significantly deforming them.

In the final molding step, the belt sleeve 40 is hung on two toothed pulleys 50, 50 capable of adjusting the distance between the shafts as shown in FIG. The upper tooth portion 41 and the lower tooth portion 42 are molded and vulcanized by being sandwiched and pressed by a temperature-adjustable press die 52 having a shape. In this step, the upper and lower teeth 41 and 42 can be accurately formed, and the upper and lower PLD values can be matched.

In the toothed mold 51, a knock pin 54 is provided at a diagonal position on both ends of the lower plate 53, and a pin insertion hole 56 is provided on the upper plate 55 at a position opposite to the knock pin 54, and the knock pin 54 is inserted into the pin insertion hole 56. The fitting prevents the upper teeth 41 and the lower teeth 42 from being displaced. The knock pin 54 has a uniform PL by adjusting the belt thickness.
A plurality of adjustment plates 57 for adjusting the D value are inserted and fixed.

When the upper teeth 41 and the lower teeth 42 are formed after the final molding, the press mold 52 is once removed, and the toothed pulleys 50 and 50 are rotated to mold the next tooth. Repeat.

[0035]

The present invention will be described below in detail with reference to examples. Example 1 A weft composed of 210 denier 66 nylon and a 200 denier wooly 6 nylon having a warp density of 150 (lines / 5 cm) and a weft density of 200 (lines / 5)
cm), the fabric is vibrated in water to shrink it to about 幅 of the width at the time of weaving, and then the fabric is immersed in an RFL solution, and 0.5 kgf / cm
(Gauge pressure) and then dried. Subsequently, a rubber paste was applied to the inside of the treated tooth cloth with a doctor knife to a thickness of 0.2 mm and dried to form a rubber layer.

Next, as a core wire, a glass fiber filament having a wire diameter of about 9 μ is bundled to form a strand, and this strand is immersed in an RFL solution, dried at 250 ° C. for 2 minutes, and subjected to 15.0 times / It is a cord composed of about 600 filaments having a twist number of 10 cm. The diameter of this cord is about 0.3 mmφ.

The above-mentioned tooth cloth is finished into an endless cylindrical body, and this is set in a grooved mold.
A pair of glass fiber cords are wound alternately at a pitch of 0.5 mm at a tension of 0.9 kg / strand, and a rolled sheet of chloroprene rubber compound is wound thereon, and a flat tooth cloth treated in the same manner as above. To form a molded body.

Subsequently, after the grooved mold was set at a predetermined position on the support table, six guide rods were mounted at regular intervals, and the matrix was inserted along the guide rods. After removing all of the guide rods, the jacket was covered and the grooved mold was placed in a vulcanizing can, semi-vulcanized by an ordinary vulcanization method, and then the semi-vulcanized belt sleeve was removed from the grooved mold.

A semi-vulcanized belt sleeve is hung on two toothed pulleys whose axial distance can be adjusted, and the belt sleeve is pressurized by a press die composed of a pair of upper and lower toothed molds to press the belt sleeve to form upper teeth and lower teeth. After forming and vulcanizing the part, the toothed pulley was rotated to move the vulcanized part, and the formation of the next tooth part was repeated. The obtained belt had a belt tooth shape: S3
M, number of teeth: 250, belt width: 6.0 mm, tooth pitch:
3.0 mm. The shape of the belt teeth after molding was good, the upper teeth and lower teeth were at the same position, and the upper and lower PLD values were also consistent.

[0040]

As described above, according to the first aspect of the present invention, a molded article is prepared by sequentially laminating a tooth cloth, a cord, an unvulcanized rubber sheet, and a tooth cloth on the outer peripheral surface of the grooved mold. A step of inserting a cylindrical matrix having convex portions and concave portions alternately at predetermined intervals along a circumferential direction into a molded body to adjust the position; semi-vulcanizing the molded body to form upper and lower teeth Pre-molding process to mold the part, and final molding process to mold and vulcanize both upper and lower teeth accurately by heating and pressing the semi-vulcanized belt sleeve taken out of the grooved mold, especially pre-molding In the process, the upper and lower teeth are formed at accurate positions on the semi-vulcanized belt sleeve, and an accurate tooth profile appears by heating and pressing in the final molding process, and the upper and lower PLD values have the same effect.

According to the second aspect of the present invention, in the step of aligning the position, after forming the molded body, one or more guide rods are arranged on the surface of the molded body in parallel with the axial direction of the mold, and then the cylindrical shape is formed. The guide die is inserted along the guide rod to align the position, and the guide rod is removed.In particular, in order to use a jig for fixing the position of the master die, the positions of the upper and lower teeth are adjusted. There is an effect that can be achieved as intended.

According to the third aspect of the present invention, there is provided a method of manufacturing a double-sided toothed belt in which a plurality of guide rods are arranged at a constant pitch, and there is an effect that the position of the matrix can be accurately positioned. .

According to the invention described in claim 4 of the present application, one bent end of the guide rod is provided in a locking hole in a side wall provided in a grooved mold, and the other end is provided in a support base. Since the guide rod is inserted into the hole, there is an effect that the installation and removal of the guide rod are easy and the operation can be completed in a short time.

According to the invention of claim 5 of the present application, the semi-vulcanized belt sleeve is placed in a mold having alternating teeth and grooves at predetermined intervals in a final molding step, and is heated and pressurized. It is a method of forming well, and even if the accurate shape of the tooth portion is not formed on the semi-vulcanized belt sleeve in the preliminary forming step, there is an effect that it can be accurately formed in the final forming step.

In the invention according to the sixth aspect of the present invention, since the tooth mold canvas is coated on the inner peripheral surface of the mother die, the escape of the air existing between the mother die and the molded body is improved so that the correct cog can be obtained. This has the effect of enabling the appearance of the part and increasing the number of uses of the matrix.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one of the steps according to the manufacturing method of the present invention, showing a state where a molded body is molded on the outer peripheral surface of a grooved mold.

FIG. 2 is a sectional view of a support used in the manufacturing method of the present invention.

FIG. 3 is a perspective view showing a state in which a grooved mold is installed on a support base in the present invention.

FIG. 4 is an enlarged view of a portion A in FIG. 3;

FIG. 5 is an enlarged view of a portion B in FIG. 4;

FIG. 6 is a perspective view showing a state where a matrix is inserted along a guide rod in the present invention.

FIG. 7 is a sectional view of a semi-vulcanized belt sleeve obtained by the manufacturing method of the present invention.

FIG. 8 is a cross-sectional view showing a state in which a semi-vulcanized belt sleeve is heated and pressed in a final molding step according to the manufacturing method of the present invention.

9 is an exploded perspective view of a toothed mold used in the final molding step of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 grooved mold 2 groove portion 3 tooth portion 4 core wire 5 tooth cloth 7 unvulcanized rubber sheet 15 molded body 25 guide rod 30 mother die 40 belt sleeve 41 upper tooth portion 42 lower tooth portion 52 press die

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-146333 (JP, A) JP-A-63-237934 (JP, A) JP-A-1-171934 (JP, A) JP-A 53-237 144982 (JP, A) JP-A-2-160577 (JP, A) JP-A-10-100280 (JP, A) JP-A-10-100281 (JP, A) JP-A-10-34764 (JP, A) JP-A-10-156962 (JP, A) JP-B-6-43106 (JP, B2) JP-B-46-22101 (JP, B1) JP-A-5-503755 (JP, A) (58) (Int.Cl. ⁷ , DB name) B29D 29/08 F16G 1/28

Claims (6)

(57) [Claims] 1. A plurality of upper teeth and lower teeth arranged along the length direction, a core wire is interposed between the upper teeth and lower teeth, and surfaces of the upper and lower teeth are provided. A method of manufacturing a double-sided toothed belt coated with a tooth cloth on the outer peripheral surface of a grooved mold, a step of producing a molded body in which a tooth cloth, a core wire, an unvulcanized rubber sheet, and a tooth cloth are sequentially laminated; A step of inserting a cylindrical mother die having convex portions and concave portions alternately at predetermined intervals along the circumferential direction into a molded body to adjust the position, semi-vulcanizing the molded body and molding both upper and lower teeth portions And a final shaping step in which both upper and lower teeth are accurately shaped and vulcanized by heating and pressing the semi-vulcanized belt sleeve removed from the grooved mold. Manufacturing method of double-sided toothed belt. 2. The step of adjusting the position is such that, after forming the molded body, one or more guide rods are arranged on the surface of the molded body in parallel with the axial direction of the mold, and then the cylindrical master is placed on the guide rod. 2. The method for manufacturing a double-sided toothed belt according to claim 1, wherein the guide bar is removed by inserting the guide rod along the position. 3. The method for producing a double-sided toothed belt according to claim 2, wherein a plurality of guide rods are arranged at a constant pitch. 4. The guide rod according to claim 2, wherein one bent end of the guide rod is inserted into a locking hole in a side wall provided in the grooved mold, and the other end is inserted into a locking hole provided in a support base. 3. The method for producing a double-sided toothed belt according to 3. 5. The final molding step comprises placing a semi-vulcanized belt sleeve in a mold having alternating teeth and grooves at predetermined intervals and applying heat and pressure to mold the teeth with high precision. A method for producing the double-sided toothed belt according to the above. 6. The double-sided toothed belt according to claim 1, wherein the cylindrical matrix has a toothed canvas covering the surfaces of the convex and concave portions provided at predetermined intervals along the circumferential direction. Manufacturing method.