JPH10180896A - Manufacture of belt with teeth on both faces - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely position an upper teeth part and a lower teeth part, and to prevent a rubber from oozing out by a method wherein on the outer peripheral face of a mold with channels, a cylindrical matrix with projected parts and recessed parts in the circumferential direction is inserted into a molded body coated with a rubber layer to perform positioning and after semi-vulcanization is performed, it is taken out and is heated and pressed. SOLUTION: A cylindrical teeth fabric 5 treated with a resorcin-formalin-latex liq. is wound on the outer peripheral face of a mold 1 with channels having channel parts 2 and teeth parts 3 and a core wire 4, an unvulcanized rubber sheet and the teeth fabric 5 are wound thereon to form a molded body 15. In addition, recessed parts 31 of a matrix 30 provided with the recessed parts 31 and projected parts 32 are inserted into guide rods 25 on the surface of the molded body 15. Then, the guide rods 25 are pulled out and the molded body 15 is placed in a vulcanization can, wherein it is semi-vulcanized. Thereafter, after the mold 1 with channels is taken out of the vulcanization can, a belt sleeve being a preliminary molded body is taken out of the mold 1 with channels and it is pinched and pressed by a press mold to mold and vulcanize an upper teeth part and a lower teeth part. In this time, the upper and lower teeth parts are precisely molded.

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, which can improve the positional accuracy of both upper and lower teeth, can form a precise tooth shape, and bleeds rubber onto the tooth surface. The present invention relates to a method for manufacturing a double-sided toothed belt that prevents protrusion.

[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. And a non-vulcanized rubber sheet and a similar tooth cloth are further wound thereon, and the thus obtained belt molded body is heated and pressed to produce a semi-vulcanized preformed body, and the grooved mold is formed. The preformed body taken out from the above is hung on two toothed pulleys capable of adjusting the distance between the shafts, and the preformed body is pressurized by a press die composed of a pair of upper and lower toothed molds, and the upper and lower teeth are pressed. And vulcanizing, vulcanizing, and moving the vulcanized portion to repeatedly form and vulcanize 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 only one side formed with a tooth portion. In order to form the part, it takes a longer time to apply a larger pressing force to the press mold, and in some cases, as the vulcanization proceeds, it is difficult for accurate tooth shapes to appear, and rubber may ooze out from the tooth surface. Was. The rubber oozing out from the surface of the tooth portion was scattered due to abrasion with the pulley, and attached to the pulley groove of the printer driving device, sometimes disturbing printing. In addition, in the method of polishing the back rubber of the vulcanized preform, a polishing step is added, and the polishing accuracy is required, so that much time is required for the polishing time.

The present invention has been made to solve such a problem, and the upper teeth and the lower teeth are provided at the correct positions so that an accurate tooth profile appears, and the bleeding of the rubber onto the tooth surface is prevented. It is an object of the present invention to provide a method for manufacturing a double-sided toothed belt in which the belt is prevented.

[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 is interposed between the upper and lower teeth and a surface of the tooth is covered with a tooth cloth and rubber oozes out on the surface of the tooth cloth. A surface is treated with a resorcinol-formalin-latex solution, and then a molded article is formed by sequentially laminating a tooth cloth having one inner surface coated with a rubber layer, a cord, an unvulcanized rubber sheet, and a tooth cloth similar to the above. 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 Preliminary molding process to mold the part, semi-vulcanized belt removed from the grooved mold In the method of manufacturing a double-sided toothed belt, which consists of a final shaping step in which the upper and lower teeth are accurately shaped and vulcanized by heating and pressurizing the leave. The tooth portion is formed at an accurate position, and an accurate tooth profile appears by heating and pressing in the final molding process, and the upper and lower PLD values (the distance from the pitch line of the core wire to the groove bottom) also match. . Furthermore, since a tooth cloth coated with a rubber layer on one inner surface after treatment with a resorcin-formalin-latex solution is used, it is possible to prevent the rubber from oozing on the tooth surface.

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.

As the above-mentioned tooth cloth 5, it is preferable to use an RFL solution which has been treated with an RFL solution and has a solid content of 10 to 50% by weight in the RFL solution obtained by drying the RFL solution. 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 is obtained by mixing an initial condensate of resorcinol and formalin with latex,
The molar ratio of resorcinol to formalin is 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. If the solid content of the RFL liquid is less than 10% by weight, the contact portion between the warp and the weft of the canvas is easy to move, and the opening is enlarged. May be exposed to the surface of the part. On the other hand, when the solid content of the RFL liquid exceeds 50% by weight,
There is a problem that the amount of solid content increases and the shape of the tooth portion of the belt does not appear accurately.

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 applied by a spreading process (coating process) and dried at a temperature of 100 to 160 ° C. for 30 to 60 seconds. Thus, a coated rubber layer 6 having a thickness of 0.1 to 0.3 mm is formed. The thickness of the coated rubber layer 6 is 0.1 m
If it is less than m, the unvulcanized rubber sheet will seep to the surface of the tooth cloth during press vulcanization, and if it exceeds 0.3 mm, the seepage of the unvulcanized rubber sheet to the tooth cloth surface will be prevented. However, the upper and lower PLD values are different. This is because the coated rubber layer 6 is deformed because the core wire 4 is wound around the rubber layer of the lower tooth cloth 5.

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 the upper and lower teeth portions in a solvent is spread (treated). Process), 100-160 ° C
At a temperature of 30 to 60 seconds to form a coated rubber layer 6 having a thickness of 0.1 to 0.3 mm. If the thickness of the coated rubber layer 6 is less than 0.1 mm, the rubber will ooze to the surface of the tooth cloth 5 in the final molding step, and if it exceeds 0.3 mm, the oozing of the rubber to the surface of the tooth cloth 5 will not occur. Even if blocked, the upper and lower PLD values are different. This is the lower tooth cloth 5
This is because the coated rubber layer 6 is deformed because the core wire 4 is wound around the coated rubber layer 6. If the inner surface of the tooth cloth 5 covering the upper and lower teeth portions is coated with the coat rubber layer 6, the upper and lower PLD values may be matched.

In the step of adjusting the position, the grooved mold 1 taken out of the molding machine is set on the support table 20. One or both of the side walls 16 of the mold 1 are formed.
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 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 grooved mold 1 is set on the support 20, the holding holes 17 of the grooved mold 1 are inserted into the main projections 21 provided on the support 20, and the positioning projections 19 of the grooved mold 1 are 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 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. 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 in 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 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 method of manufacturing the matrix 30 is as follows. An unvulcanized rubber sheet of a toothed canvas is placed on a flat mold having separately prepared teeth and grooves alternately arranged, and is heated and pressed to form a concave shape. To produce a vulcanized sheet-like laminate having alternating portions and convex portions. After cutting the bottoms of the two concave portions of the laminate at a predetermined distance, apply rubber glue to each end surface so as to form a cylindrical shape and butt them together. 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 stamping machine may be used on an engraving drum in which grooves and teeth extending in the circumferential direction 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 removed, the process proceeds to a pre-molding step in which the molded body 15 is vulcanized by an ordinary 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 pressurization, and while extending the tooth cloth 5 below the gap between the core wires 4, the groove 2
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 center distance as shown in FIG. 8, and a pair of upper and lower toothed molds 51, 51 to be used are used. 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, knock pins 54 are provided at diagonal positions on both ends of the lower plate 53, and a pin insertion hole 56 is provided on the upper plate 55 at a position facing the knock pins 54, and the knock pins 54 are inserted into the pin insertion holes 56. The fitting prevents the upper teeth 41 and the lower teeth 42 from being displaced. The knock pin 56 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 die 52 is once removed, and the toothed pulleys 50 and 50 are rotated to mold the next tooth. Repeat.

[0036]

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 and shrunk to about 1/2 of the width at the time of weaving, and then the fabric is immersed in the RFL solution shown in Table 1 and then put on a pair of rolls. 0.5k
After being squeezed at gf / cm (gauge pressure), it was dried. Subsequently, a rubber paste shown in Table 3 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 coated rubber layer.

Next, a strand is formed by bundling glass fiber filaments having an element wire diameter of about 9 μ as a core wire, and this strand is immersed in an RFL solution, dried at 250 ° C. for 2 minutes, and then 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.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

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 consisting of a pair of upper and lower toothed molds to press the upper sleeve portion and the 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 is good, and the upper teeth and lower teeth are at the same position.
The LD values also matched, and rubber did not exude on the tooth surface.

[0044]

As described above, according to the first aspect of the present invention, the outer peripheral surface of the grooved mold is treated with a resorcinol-formalin-latex solution and then a rubber cloth is adhered to one inner surface of the grooved cloth. Wire, unvulcanized rubber sheet, and a step of producing a molded body in which the same tooth cloth as described above is sequentially laminated, a cylindrical matrix having convex portions and concave portions alternately at predetermined intervals along a circumferential direction. A process of inserting into the molded body to adjust the position,
A pre-molding step of semi-vulcanizing the molded body to mold both upper and lower teeth, and heating and pressurizing the half-vulcanized belt sleeve taken out of the grooved mold to form the upper and lower teeth with high precision. The upper and lower teeth are formed in precise positions on the semi-vulcanized belt sleeve in the pre-molding process, and the precise tooth profile appears in the final molding process by heating and pressing. Have the same PLD value, and the rubber can be prevented from seeping out to the tooth surface.

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.

The invention according to claim 3 of the present application is a method for manufacturing a double-sided toothed belt in which a plurality of guide rods are arranged at a constant pitch, and has an effect that the position of the matrix can be accurately positioned. .

According to the fourth aspect of the present invention, 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.

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 is heated and pressurized, and the teeth are precisely formed. 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 claim 6 of the present application, 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]

 DESCRIPTION OF SYMBOLS 1 Grooved mold 2 Groove part 3 Tooth part 4 Core wire 5 Tooth cloth 6 Coated rubber layer 7 Unvulcanized rubber sheet 15 Molded body 25 Guide rod 30 Master mold 40 Belt sleeve 41 Upper tooth part 42 Lower tooth part 52 Press die

Claims (6)

[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 in which a tooth cloth is coated and a rubber ooze on the surface of the tooth cloth is suppressed, wherein an outer surface of a grooved mold is treated with a resorcinol-formalin-latex solution, and then one inner surface is treated. A process of producing a molded body in which a tooth cloth, a core wire, an unvulcanized rubber sheet, and the same tooth cloth as described above are sequentially laminated, with a coat rubber layer adhered to the convex part and the concave part at predetermined intervals along the circumferential direction. Inserting a cylindrical matrix having alternating parts into the molded body to adjust the position; semi-vulcanizing the molded body to mold the upper and lower teeth, and a half-mold removed from the grooved mold By heating and pressing the vulcanized belt sleeve, both upper and lower teeth Final typing process, the method for producing the double-sided toothed belt, characterized in that it consists of well-typed to be vulcanized. 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.