JP2003240058A - Manufacturing method of toothed belt and toothed belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a toothed belt, and the toothed belt, while preventing cracks and sound production from a joint part of a tooth cloth at an early stage. <P>SOLUTION: This method includes a step for forming and finishing a joint part 30 into a tooth cloth with a predetermined peripheral length by overlaying ends of fiber materials, fusion-cutting and welding the ends while applying the pressure; a step for forming an insertion part to the joint part 30 for inserting a positioning bar positioning the joint part 30 in a groove when a metallic mold having grooves along the longitudinal direction are coated with a tooth cloth 3; a step for inserting the positioning bar into the insertion part and attaching the tooth cloth 3 to the metallic mold in a manner that the positioning bar is placed in the groove; and a step for spinning a core wire 35 on the surface of the tooth cloth 3 attached to the metallic mold, laminating an unvulcanized rubber 36 on the toothed cloth after detaching the positioning bar, and vulcanizing it so as to form a belt sleeve. <P>COPYRIGHT: (C)2003,JPO

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 toothed belt and a toothed belt, and more particularly, to a joint portion of a toothed cloth by combining ultrasonic welding and sewing at the time of manufacturing the tooth cloth in a preparation step. The present invention relates to a method for manufacturing a toothed belt that reduces defects and a toothed belt that reduces defects in a joint portion.

[0002]

2. Description of the Related Art In a conventional toothed belt, a rubber compound containing chloroprene or the like as a raw material rubber is used as teeth and a back portion, and SBR vinyl pyridine latex is used as a latex component.
Consists of a tooth cloth made of glass fiber cord or aramid fiber cord bonded with an L (resorcin / formalin / latex) liquid for the core wire, and crimped nylon as a weft thread in the longitudinal direction of the belt. It is used as a belt for driving and office equipment.

And, this tooth cloth generally has a joint portion for forming a cylindrical shape. It is disclosed in Japanese Utility Model Publication No. 57-1159 that the end portion of the tooth cloth is superposed on the joint portion, and hot-melt joint is performed by a blade having an acute-angled tip heated by a heater to reduce the protrusion amount of the joint end portion. .

However, in the case of a hot melt joint, it is necessary to take a wide joint allowance in order to increase the strength and to leave the melted material of the fiber in the fused joint portion. When the joint part is located on the tooth part of the toothed belt, the joint height, which is the amount of protrusion of the joint end part, becomes large and occupies a large part of the tooth part volume. This remarkably appeared in the toothed belt of. As a result, an abnormal situation occurred in which the rubber was not sufficiently pressed into the tooth portion when the belt was molded, and the tooth portion having a cavity was molded. Specifically, in a toothed belt having a very small tooth pitch of about 1 mm, such a problem may occur, and it is necessary to solve the problem immediately.

Further, in the case of a hot melt joint, since a heater is used as a heat source, there is a risk of burns to the worker. Furthermore, the joint height becomes unstable due to variations in the heating temperature, the strength of the joint changes, and the quality of the toothed belt is greatly affected.

Further, as a method of forming the joint portion, there is a sewing machine sewing method. The machine-joint portion formed by sewing the sewing machine has a feature that the strength of the joint portion is larger than that of the hot-melt joint. However, the strength of the sewing machine tends to change when the feed amount changes (change in slip ratio) due to the rigidity of the tooth cloth and the state of the tooth cloth surface when sewing the sewing machine, and these states change. Even under the same sewing conditions, the strength of the sewing may vary. Even if the sewing was strong or weak, the toothed belt was defective.

[0007] For example, a cylindrical tooth cloth with strong sewing has a shape in which a joint portion is protruded. When this is used for manufacturing a toothed belt, the protrusion portion of the joint portion is embedded in the tooth portion, and from this portion. Early cracks were generated, which was a cause of early cracking defects when the belt was running.

On the other hand, when the sewing becomes weak, the tooth cloth located on the surface of the tooth portion of the mold does not move because it is pressed by the cord, but the sewing thread of the groove is locally stretched by the flow of rubber. The unvulcanized rubber during the manufacturing of the toothed belt overflowed from this portion, so-called puncture failure occurred.
In the belt where this occurred, a sound was produced when the rubber contacted the pulley. However, the cylindrical tooth cloth obtained by the sewing machine joint is suitable for the OHC driving toothed belt because it has sufficient strength. There was an abnormal product located in the toothed part and the rubber was not pressed into the teeth.

Therefore, as a method for manufacturing a toothed belt which solves these problems, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 2001-2001.
No. -50352 is disclosed. In this method, the fibrous material that covers the tooth surface of the toothed belt is continuously thermocompressed by ultrasonic vibration while melting and cutting the area in the vicinity of it to increase the strength of the joint and reduce the joint height. Then, the teeth are filled with rubber.

[0010]

[Patent Document 1] Japanese Unexamined Patent Publication No. 200
In the manufacturing method of the toothed belt in No. 1-50352,
Although it is possible to eliminate problems such as puncture defects and crack defects, it was difficult to prevent the joint part from shifting from the tooth part during the manufacture of the toothed belt.

The present invention is intended to improve such problems, and to eliminate the troubles (rubber exudation, cracking, deviation) of the joint portion of the tooth cloth to improve the appearance, and to improve the appearance from the joint portion early. An object of the present invention is to provide a method for manufacturing a toothed belt in which cracking and pronunciation are prevented and the toothed belt.

[0012]

A method for manufacturing a toothed belt according to claim 1 of the present invention for solving the above-mentioned problems, comprises:
Method for manufacturing a toothed belt including a plurality of tooth portions provided at predetermined intervals along the longitudinal direction, a back portion in which a core wire is embedded, and a tooth cloth made of a fiber material coated on the tooth portion surface. The step of stacking the end portions of the fiber material, forming a joint portion by melt cutting and fusing while crimping the end portion, and finishing the tooth cloth with a predetermined circumference, and the joint portion. A step of forming an insertion portion for inserting a positioning rod that positions the joint portion so that the joint portion is located in the groove when the tooth cloth is covered with a mold having a groove along the longitudinal direction, A step of inserting a positioning rod into the insertion portion, and mounting the tooth cloth on the mold so that the positioning rod is positioned in the groove; and a core wire on the surface of the tooth cloth mounted on the mold. After spinning and pulling out the positioning rod, The unvulcanized rubber laminated on the tooth cloth are those containing a step of forming a belt sleeve by vulcanization molding, the. The ends of the fibrous materials are overlapped, and the ends are crimped and melted and cut and fused to form a joint, which is finished into a tooth cloth with a specified circumference, and the joint is positioned when it is attached to the mold. By forming an insertion part that inserts a positioning rod that positions so as not to shift,
A puncture defect, a crack defect, and a misalignment defect that occur in the joint portion can be reliably prevented.

The toothed belt manufacturing method according to a second aspect of the present invention is the method of manufacturing the toothed belt according to the first aspect, wherein the insert portion overlaps the end portions of the fibrous material and melt-cuts and melts while crimping the end portions. A sewing machine is sewn so as to straddle the joint portion formed by wearing, and is a space formed between the thread of the sewing machine and the tooth cloth of the joint portion. By sewing the sewing machine so that it straddles the joint part,
The space between the sewing thread and the tooth cloth of the joint can be used as the insertion portion. In this way, it is possible to form the insertion portion that can prevent the displacement of the joint portion by a simple method. Also, by sewing the sewing machine across the joint,
It is also possible to increase the strength of the joint portion.

Further, the method for manufacturing a toothed belt according to a third aspect of the present invention is the method according to the first aspect, wherein the insert portion overlaps the end portions of the fiber material and melt-cuts and melts them while crimping the end portions. It is a space formed between the joint portion formed by the attachment and the joint portion formed by fusing a part or all of the inside of the joint portion. By forming a joint that is formed by fusing part or all of the tooth cloth inside the joint, a gap is formed between the tooth cloth between the joint and the joint, and this gap is positioned. It can be the insertion part of a rod.

Further, in the method for manufacturing a toothed belt according to a fourth aspect of the present invention, in the third aspect, the joint is released from the joint due to pressure during spinning of the core wire or during vulcanization. It is what is done. The joint is temporarily fused with a joining force that releases the joint due to the pressure during spinning of the core wire or the pressure during vulcanization. The belt sleeve can be formed to be located on the top of the section.

A method for manufacturing a toothed belt according to a fifth aspect is the method for producing a toothed belt according to any one of the first to fourth aspects, wherein the melt cutting and the fusion are performed by forming an end portion where the fiber materials are superposed on each other.
It is installed between a tool horn of an ultrasonic device and a rotatable melt cutting roller, and the vicinity of the melt cutting roller is melt-cut and fused while being continuously thermocompressed to the fiber material. The fiber material is continuously thermo-compressed by ultrasonic vibration and melted and cut in the vicinity of it, and the joint height of the joint part becomes very small, so that the tooth part can be sufficiently filled with rubber. In addition, the joint strength is high, and the tooth portion having strength can be molded.

Further, in a method for manufacturing a toothed belt according to a sixth aspect of the present invention, in any one of the first to fourth aspects, the positioning rod is a rod member formed of a rigid body. Since the positioning rod is a rod formed of a rigid body, it does not bend in the groove of the mold, so that accurate positioning can be performed and misalignment defects can be more reliably prevented. Here, the bar material that can be used as the positioning bar is not limited as long as it does not bend, for example,
Metallic materials such as iron and stainless steel and resinous materials can be used. The cross-sectional shape is also not particularly limited, but a circular shape is preferable from the viewpoint of easy insertion and extraction.

A method for manufacturing a toothed belt according to a seventh aspect of the present invention is the method of manufacturing a toothed belt according to any one of the first to fourth aspects, wherein when the positioning rod attaches the tooth cloth to the mold, It is inserted so as to be located on the inner peripheral side. By inserting the positioning rod so as to be positioned on the inner peripheral side of the tooth cloth, the positioning rod can be easily positioned in the groove of the mold when the tooth cloth is mounted on the mold.

The method for manufacturing a toothed belt according to claim 8 is the method for manufacturing a toothed belt according to any one of claims 1 to 4, wherein when the positioning rod mounts the tooth cloth on the mold, It is inserted so as to be located on the outer peripheral side. By inserting the positioning rod so as to be located on the outer peripheral side of the tooth cloth, the tooth cloth can be attached to the mold, and by spinning the core wire, the positioning rod can be reliably positioned in the groove of the mold. Therefore, the joint portion can be reliably positioned on the top of the tooth portion.

Further, the toothed belt according to a ninth aspect of the present invention is a toothed belt having a plurality of tooth portions provided at predetermined intervals along the longitudinal direction, a back portion in which a core wire is embedded, and a fiber material coated on the tooth portion surface. A toothed belt comprising, and a toothed belt comprising the toothed cloth, wherein the toothed cloth has a joint portion in which end portions of the fiber material are abutted and fused to each other, and the joint portion is the It is located on the top of the teeth. A toothed belt according to a tenth aspect of the invention is the toothed belt according to the ninth aspect of the invention, wherein the sewing machine is sewn so as to straddle the joint portion. Since the joint part of the tooth cloth is fused and sewn by sewing machine sewing, and this joint part is located in the approximate center of the top part of the tooth part, there is no puncture, crack, or misalignment in the joint part. Defects are greatly reduced.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method for manufacturing a toothed belt according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a part of the steps of the method for manufacturing a toothed belt according to the first exemplary embodiment of the present invention. 2 is a schematic plan view of a joint device for toothed belt tooth cloth, FIG. 3 is a front view of FIG. 2, FIG. 4 is an enlarged view taken along line AA in FIG. 2, and FIG. 5 is a plan view of a tool horn. FIG. 6 is a diagram showing a part of the steps of the method for manufacturing a toothed belt tooth cloth, in which the tooth cloth is continuously thermocompressed and melted and cut in the vicinity thereof, and FIG. It is the enlarged view seen from the BB line in FIG. FIG. 8: is a figure which shows a part of process of the manufacturing method of the toothed belt which concerns on the 2nd Embodiment of this invention. Figure 9
[Fig. 6] is a view showing a part of the steps of a modification of the method for manufacturing a toothed belt according to the second exemplary embodiment of the present invention. Figure 10
It is a figure showing a sectional view of a toothed belt concerning the present invention.

The tooth cloth 3 used for the toothed belt in the first embodiment is a plain weave, as shown in FIG.
Textile materials such as twill fabrics, satin fabrics and other canvas fabrics or non-woven fabrics can be used. In the case of canvas, the weft in the longitudinal direction of the belt is polyamide fiber such as aramid fiber, 6 nylon, 6.6 nylon and 12 nylon, polyester fiber, polyvinyl alcohol fiber and the like and is not particularly limited.

Then, this fiber material is pretreated with RFL solution, isocyanate solution or epoxy solution. The RFL liquid is a mixture of latex with an initial condensate of resorcin and formalin, and the latex used here is a styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin. Such as latex.

Next, the tooth cloth 3 made of the treated fiber material is cut into a predetermined length as shown in FIG. 1 (b). After cutting into a predetermined length, as shown in FIG. 1 (c), the end portions are overlapped with each other and melt-cut and fused while being pressed to obtain a tooth cloth 3 having a predetermined peripheral length.

The step of superposing the end portions of the tooth cloth 3 and melting and cutting the same while pressing them together is performed by the joint device 1 shown in FIG. This joint device 1
Is a raw cloth table 2 on which a tooth cloth 3 which is a flat fiber material cut in advance to a predetermined width is installed, a melt cutting device 6 including a rotatable melt cutting roller 5, and a tool horn 4 which is an ultrasonic oscillator. A processing part 7 for melting and cutting the vicinity of the tooth cloth 3 which is superposed on two pieces while continuously thermocompressing the ends thereof.
And a pulling table 8 for pulling out and installing the jointed tooth cloth 3.

The tool horn 4 of the processing section 7 is a rod-shaped ultrasonic wave oscillator, which becomes rotatable as the melting and cutting roller 5 rotates, is mounted on the carriage 10 and reciprocates in the width direction (see FIG. 3). On the other hand, the melt cutting roller 5 located on the upper side is moved up and down by the elevating cylinder 11 to come into contact with the tool horn 4 to generate ultrasonic vibrations, whereby the fiber material is fused and melted and cut at the same time.

The melting and cutting roller 5 is rotated by the mounted prime mover 12 and a transmission belt (not shown), and has a function of fusing a disk-shaped cutter having an acute-angled tip and a fiber material ( (See FIG. 4). The tool horn 4 also rotates (see FIG. 5). The tip angle of the melt cutting roller 5 can be changed depending on the kind of the fiber material. For example, in the case of canvas, 40 to 60 ° is preferable, and in the case of non-woven fabric, 60 ° is preferable.

The moving means of the carriage 10 rotates the shaft 18 mounted on the support table 14 by the transmission belt 17 attached to the lateral movement prime mover 16 installed on the top of the support column 15, and the gear 19 inserted into the shaft 18 is rotated. Rotation the chain 2
0, and the carriage 10 fixed to the chain 20 is reciprocated along the guide rails 21 and 21. on the other hand,
The melting and cutting device 6 also moves at the same time as the carriage 10. The melt cutting device 6 is fitted to a pair of guide rails 24, 24 arranged in the lateral direction by a moving support plate 23, and is movable in the lateral direction. That is, as the moving means, the rotation of the lateral movement prime mover 16 is transmitted from the transmission belt 17 to the gear 26 and to the chain attached to the transmission belt 17 to reciprocate the melt cutting device 6.

First, the tooth cloth 3 having the end portions overlapped with each other is pulled out from the original fabric table 2, and the end portion 29 is fixed to the carriage 10 of the processing portion 7 by a clip means or the like. in this case,
As shown in FIGS. 6 and 7, the end portion 29 is placed between the tool horn 4 which is an ultrasonic oscillator and the melt cutting roller 5, and the melt cutting roller 5 is lowered by the operation of the elevating cylinder 11, and the tool horn is moved. Contact 4 Then, when the ultrasonic oscillator is actuated, the melting cutting roller 5 is simultaneously rotated, and the carriage 10 is moved, the tool horn 4 and the melting cutting roller 5 are moved at the same time, and the tooth cloth 3 is continuously thermocompressed. The vicinity is melt-cut. It should be noted that the end portion 29 is scraped in a small amount. The moving speed of the melting and cutting roller 5 is 2 to 10 m / min, and the frequency of the melting and cutting roller 5 is 10 to 30 KHz.

Next, as shown in FIGS. 1 (d) and 1 (e), a sewing machine is sewn so as to straddle the fusion-cut and fused joint portion 30 to form a cylindrical tooth cloth 3. The sewing thread 31 used is polyamide such as 6 nylon, 6.6 nylon or 12 nylon, polyester, polypropylene,
A twisted filament yarn such as aramid and a monofilament yarn can be used. Then, the strength of the sewing machine is measured by the resistance value of pushing the insertion rod between the sewing thread 31 and the tooth cloth 3 of the sewing machine, and is usually 1 to 5 kg.
Use the size set in the range of. This measuring method uses a sewing machine sewing strength measuring jig in which a tension gauge having a length of 200 to 500 mm and a diameter of 1 to 3 mm, such as stainless steel, with a sharp-angled tip is attached to the tension gauge by welding. It is used to measure the mechanical resistance value at the time of insertion, and specifically, the insertion rod is 100 to 400 m between the sewing thread and the tooth cloth of the sewing machine seam on the outside of the cylindrical tooth cloth.
It is possible to quantitatively measure the maximum value of the mechanical resistance value, which is the pushing pressure, by inserting about m. When the sewing strength of the sewing machine is small, the mechanical resistance value is small. On the contrary, when the sewing strength of the sewing machine is large, the mechanical resistance value is large.

Next, a metal or resin such as iron or stainless steel is inserted into the insertion portion 34 formed between the thread 31 sewn by the sewing machine and the tooth cloth 3 of the joint portion 30 on the inner peripheral side of the cylindrical tooth cloth 3. The positioning rod 32 composed of a rod made of the like is inserted. Then, as shown in FIG. 1F, the positioning rod 32 is mounted so as to be positioned in the groove 41 of the mold 40. Here, the positioning rod 32 only needs to have a cross-sectional area such that it can sufficiently enter the groove 41 of the mold 40. The cross-sectional area is usually preferably 5 to 50% of the volume of the groove 41 of the mold 40. When it is less than 5%, for example, when the positioning rod 32 is inserted so as to be positioned on the outer peripheral portion of the tooth cloth 3, the cylindrical tooth cloth 3 is heated and pressed together with the insertion rod 32 and the mold 40.
In the process of pressing into the groove 41 and producing a preform, the amount of deformation of the tooth cloth 3 is small, and the amount of deformation of the tooth cloth due to the flow of rubber during vulcanization molding is large. On the other hand, when it exceeds 50%, the positioning rod 32 is difficult to be inserted into the joint portion 30, and the outer sewing thread 31 is stretched, so that the joint portion 30 is easily deformed or cut. A glass fiber cord or an aramid fiber cord that forms the core wire is spirally wound around it. In addition, this positioning rod 3
2 corresponds to the size of the tooth portion of the toothed belt to be manufactured,
The size and the cross-sectional shape are appropriately selected.

After winding this core wire, the positioning rod 32
Pull out. This is because the tooth cloth 3 is less likely to be displaced after winding the core wire. Then, after removing the positioning rod 32, an unvulcanized rubber sheet forming a tooth portion and a back portion is laminated, covered with a jacket, and vulcanized in a vulcanizing can. During the vulcanization molding, the resin is poured into the concave portion of the mold together with the cylindrical fiber material by the plastic flow of the rubber, and the belt sleeve is manufactured. After removing the vulcanized belt sleeve from the mold, the vulcanized belt sleeve is attached to two shafts of a cutting machine, and while being applied with tension and rotated, it is cut into a predetermined width by a cutter to produce a toothed belt.

Examples of the rubber of the unvulcanized rubber sheet forming the teeth and the back are hydrogenated nitrile rubber, hydrogenated nitrile rubber to which a metal salt of an unsaturated carboxylic acid is added, and chlorosulfonated polyethylene (CSM). ), Alkylated chlorosulfonated polyethylene (ACSM), chloroprene rubber and the like, which have improved heat aging resistance. The hydrogenated nitrile rubber has a hydrogenation rate of 80%.
The above is the case, and 90% or more is preferable in order to exhibit the characteristics of heat resistance and ozone resistance. A hydrogenated nitrile rubber having a hydrogenation rate of less than 80% has extremely low heat resistance and ozone resistance.

As described above, since the joint portion 30 is fused by cutting and melting the vicinity while thermocompressing the end portions, the joint height is very small and the joint strength is high. As a result, the joint part 3
It is possible to reliably prevent puncture defects and crack defects of 0. Further, since the joint portion 30 is sewn with the sewing machine and is attached to the mold by using the positioning rod 32, it is possible to reliably prevent the displacement when the sewing machine is sewn without adjusting the sewing strength. It is possible to prevent the tooth cloth from being displaced when the core wire is wound and to prevent misalignment. Therefore, the joint portion 30 of the tooth cloth 3 comes to be located on the top of the tooth portion, which makes it possible to improve the appearance and suppress the sound generation.

In this embodiment, one example of the case where the end portions of one fiber material are overlapped to form a cylindrical tooth cloth is shown. However, the method for manufacturing a toothed belt according to the present invention is not limited to this. However, the present invention is not limited to the above embodiment. For example, two fibrous materials are overlapped, both ends of which are melt-cut and fused to form joint parts at both ends to form a cylindrical tooth cloth, and one or both ends are sewn with a sewing machine. You can also do it.

Next, a second embodiment of the present invention will be described with reference to FIG. It should be noted that the reference numerals shown in FIG. 8 are given to the same members as those in FIGS. 1 to 7 described above, and detailed description thereof will be omitted.

The tooth cloth 3 according to the present embodiment is shown in FIG.
As shown in FIG. 2, after the joint portion 30 is formed, the inner portion of the joint portion 30 is further partially or entirely formed into the joint portion 30, and the joint device 1 shown in FIG. The bonded tooth cloth 3 is fused to form the joint portion 33. The joint portion 33 and the joint portion 3
The cylindrical portion formed by 0 and 0 serves as an insertion portion 34 into which the positioning rod 32 is inserted.

The positioning rod 32 is inserted into the insertion portion 34 so that the insertion portion 34 into which the positioning rod 32 is inserted is positioned on the groove 41 of the mold 40 as shown in FIG. 8 (e). Then, the tooth cloth 3 is attached.

Next, the core wire 35 is spirally wound around the surface of the tooth cloth 3. At this time, as shown in FIG. 8F, the joint portion 30 of the tooth cloth 3 is pressed into the groove 41 by the winding force of the core wire 35. And
At this time, since the joint portion 33 is in a state where a part or the whole thereof is temporarily fused, the joint is released.

Next, the positioning rod 32 is removed, unvulcanized rubber is laminated and vulcanized and molded. The joint portion 30 is
Since it is reliably positioned in the groove 41 of the mold 40, misalignment defects are suppressed. Further, since the joint portion 30 is fused, the occurrence of puncture defects and the like can be suppressed.

The present embodiment example can also be carried out as follows.

After the joint portion 33 is temporarily fused and formed, the tooth cloth 3 is turned over, and the positioning rod 32 is inserted into the insertion portion 34. Then, as shown in FIG. 9A, the tooth cloth 3 is attached to the mold 40 so that the positioning rod 32 is located in the groove 41.

After the tooth cloth 3 is mounted on the mold 40, the core wire 35 is spirally wound around the surface of the tooth cloth 3 as described above. After winding the core wire 35, the positioning rod 32 is extracted, and the unvulcanized rubber 36 is laminated and vulcanized and molded. During this vulcanization molding, as shown in FIG. 9B, in the process in which the rubber is being filled in the groove 41, the temporarily fused joint portion 33 is formed.
Is removed. Therefore, the rubber 36 is completely in the groove 4
When the inside of the mold 1 is filled, the tooth cloth 3 is molded along the wall surface of the groove 41 of the mold 40.

FIG. 10 shows a partial cross-sectional view of the toothed belt according to the present invention molded as described above. In the toothed belt A according to the present invention, as shown in the drawing, the joint portion 30 of the tooth cloth 3 is located at the top of the tooth portion 38. Further, since the joint portion 30 is fused and reliably joined, problems such as puncture failure and crack failure do not occur. In addition, since the insertion portion 34 of the positioning rod 32 for positioning is formed in the joint portion 30 and molding is performed, it is possible to reliably suppress the misalignment defect of the joint portion 30.

[0045]

EXAMPLES The present invention will be specifically described below with reference to examples.

(Example) A warp made of a filament yarn of 200 denier in which filament raw yarn of 1.5 denier para-aramid fiber was bundled, and 66 of 200 denier
Weft composed of nylon and 140 denier urethane elastic yarn, with a warp density of 110 (pieces / 5 cm) and a weft density of 120
After weaving a 2/2 twill weave with (books / 5 cm), the fabric is vibrated in water to shrink it to about half the width at the time of weaving, and then the fabric is soaked in the RFL liquid to 0 for the roll.
After squeezing at 5 kgf / cm (gauge pressure), it was dried. After cutting the obtained canvas to a predetermined length, the ends of this canvas are overlapped, and the end is placed between the tool horn of the joint device and the melt cutting roller, and the melt cutting roller is spun on the fiber material. While continuously thermocompressing at 5 m / min, the vicinity thereof was melt-cut and fused to form a joint portion, and a cylindrical tooth cloth was finished. Next, the joint portion of the obtained cylindrical tooth cloth was sewn by sewing. Then, a rod made of stainless steel was inserted into an insertion portion formed between the thread and the tooth cloth by sewing with the sewing machine inside the cylindrical tooth cloth. Next, the rod was mounted so that it was positioned in the groove of the mold.

As a core wire, about 200 glass fiber filaments having a diameter of about 9 μm are bundled to form a strand, and the strands are aligned and immersed in the RFL solution, dried at 130 ° C. for 2 minutes, and dried at 250 to 300 ° C. for 2 minutes. After baking for a minute,
A ply-twisted yarn was prepared in which the ply-twisted yarn was twisted in the S direction the same number of times as the ply-twisted yarn twisted in the S direction at about 12 times / 10 cm. Then S
13 ply-twisted yarns in the same direction and about 8 ply-twisted yarns
A glass fiber cord twisted in the Z direction at a ratio of 10 cm was used. Similarly, 13 Z twisted lower twisted yarns were similarly aligned, and a glass fiber cord having a twist number of 8 times / 10 cm in the S direction was used.

A chloroprene rubber composition obtained by winding S and Z pairs of the above-mentioned glass fiber cords so as to be alternately arranged on a cylindrical tooth cloth fitted with the core wire, and rolling from the top. The unvulcanized rubber sheet consisting of was vulcanized by a vulcanization method by ordinary press-fitting, and the vulcanized sleeve was cut into a predetermined width to produce a toothed belt. The obtained belt has a tooth profile of the belt: S8M, the number of teeth: 106,
Belt width: 25.0 mm.

(Comparative Example 1) A toothed belt was produced in the same manner as in Example except that the joint portion of the tooth cloth was not sewn with the sewing machine but only the fusion cutting and the fusion were performed.

Comparative Example 2 A toothed belt was produced in the same manner as in Example except that the joint portion of the tooth cloth was formed by sewing only.

With respect to the toothed belt obtained by each of the above methods, Table 1 shows the defective rates of puncture defects, crack defects and misalignment defects of the joint portion. It should be noted that each defect rate is a value obtained by dividing each defect occurrence amount by the belt production amount.

[0052]

[Table 1]

As can be seen from Table 1, the toothed belt according to the embodiment in which the end portions are melt-cut and fused while being crimped to form the joint portion, and the sewing machine sewing is performed so as to straddle the joint portion, the defective rate is high. Is significantly reduced, and it can be seen that the defect occurrence rate can be improved.

[0054]

The present invention is configured as described above,
The ends of the fiber material are overlapped, and the ends are crimped and melted and cut and fused to form a joint, which is finished into a tooth cloth with a predetermined circumference, and this joint is attached to a mold. By forming the insertion portion into which the positioning rod for performing positioning at the time of forming can be formed, it is possible to reliably prevent problems such as puncture defects, crack defects, and misalignment defects of the joint part. Therefore, the joint part of the tooth cloth can be a toothed belt located at the top of the tooth part, and the appearance of the joint part can be improved by eliminating defects (rubber bleeding, cracking, displacement) of the joint part, and It is possible to manufacture toothed belts that prevent cracking and pronunciation.

[Brief description of drawings]

FIG. 1 is a diagram showing a part of the steps of a method for manufacturing a toothed belt according to a first exemplary embodiment of the present invention.

FIG. 2 is a schematic plan view of a joint device for toothed belt tooth cloth.

FIG. 3 is a front view of the joint device in FIG.

FIG. 4 is an enlarged view taken along the line AA in FIG.

FIG. 5 is a plan view of a tool horn of the joint device.

FIG. 6 is a diagram showing a part of the process of the method for manufacturing the tooth cloth for toothed belt, in which the tooth cloth is continuously thermocompression-bonded and melted and cut in the vicinity thereof.

FIG. 7 is an enlarged view taken along line BB in FIG.

FIG. 8 is a diagram showing part of the steps of the method for manufacturing a toothed belt according to the second exemplary embodiment of the present invention.

FIG. 9 is a diagram showing a part of the steps of a modified example of the method for manufacturing a toothed belt according to the second exemplary embodiment of the present invention.

FIG. 10 is a view showing a sectional view of a toothed belt according to the present invention.

[Explanation of symbols]

1 joint device 3 tooth cloth 19 gears 29 Edge 30 joint 31 thread 32 Positioning rod 33 joint 34 Insert 35 core wire 36 rubber 37 back 38 teeth 40 mold 41 groove

Claims (10)

[Claims] 1. A tooth comprising a plurality of tooth portions provided at predetermined intervals along the longitudinal direction, a back portion in which a core wire is embedded, and a tooth cloth made of a fiber material and coated on the surface of the tooth portion. A method of manufacturing an attached belt, which comprises stacking the end portions of the fiber material, forming a joint portion by melting and cutting and fusing the end portions while crimping the end portions, and finishing the tooth cloth with a predetermined circumference. In the joint portion, an insertion portion for inserting a positioning rod that positions the joint portion so that the joint portion is located in the groove when the mold having the groove in the longitudinal direction is covered with the tooth cloth is provided in the joint portion. A step of forming, a step of inserting a positioning rod into the insertion part, and a step of attaching the tooth cloth to the mold so that the positioning rod is positioned in the groove, and a step of attaching the tooth cloth to the die Spin the core wire on the surface of the After taking came, the unvulcanized rubber is laminated on the tooth cloth, the production method of the toothed belt that includes a step of forming a belt sleeve by vulcanization molding, the. 2. The sewing portion is sewn so that the insertion portion straddles the joint portion formed by stacking the end portions of the fiber material and melting and cutting the end portions while crimping the end portions. The method for manufacturing a toothed belt according to claim 1, wherein the gap is formed between the yarn of the above and the tooth cloth of the joint portion. 3. The joint portion, wherein the insertion portion is formed by stacking the end portions of the fiber material and melting and cutting and adhering the end portions while crimping the end portions, and a part of the inside of the joint portion or The method for producing a toothed belt according to claim 1, wherein the toothed belt is a void formed between the whole and the joint formed by fusion bonding. 4. The method for manufacturing a toothed belt according to claim 3, wherein the joining portion is released from the joining due to a pressure during spinning of the core wire or pressure during vulcanization. 5. The melt cutting and fusing is performed by placing an end portion of the fiber materials overlapped between a tool horn of an ultrasonic device and a rotatable melt cutting roller, and the melt cutting roller is The fiber material is melt-cut and fused in the vicinity thereof while being continuously thermocompressed to the fiber material.
The method for manufacturing a toothed belt according to any one of 1. 6. The method for manufacturing a toothed belt according to claim 1, wherein the positioning rod is a rod formed of a rigid body. 7. The tooth according to claim 1, wherein the positioning rod is inserted so as to be located on an inner peripheral side of the tooth cloth when the tooth cloth is attached to the mold. Belt manufacturing method. 8. The toothed product according to claim 1, wherein the positioning rod is inserted so as to be positioned on the outer peripheral side of the tooth cloth when the tooth cloth is mounted on the mold. Belt manufacturing method. 9. A tooth comprising a plurality of tooth portions provided at predetermined intervals along the longitudinal direction, a back portion in which a core wire is embedded, and a tooth cloth made of a fibrous material coated on the surface of the tooth portion. An attached belt, wherein the tooth cloth has a joint portion in which end portions of the fiber material are abutted and fused to each other, and the joint portion is located at the top of the tooth portion. belt. 10. The toothed belt according to claim 9, wherein a sewing machine is sewn so as to straddle the joint portion.