JPH11153197A - Toothed belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of noise and flying of rubber powder due to contact of rubber on the inside of a tooth cloth with a toothed pulley, to prevent image decrease due to exposure of black rubber and to improve load durability of a toothed belt. SOLUTION: Tooth cloth 6 to be applied on the side of tooth rubber 3 of a belt main body 4 of a toothed belt 1 is soaked in RF liquid, adhered and treated. A white rubber layer 7 is interposed between the side of the tooth rubber 3 and the tooth cloth 6 of the belt main body 4. At this time, the white rubber layer 7 is devised not to be exposed outside from textures of the tooth cloth 6. Resorcinol-formaldehyde resin is blended in the white rubber layer 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a toothed belt, and more particularly to a measure against noise and scattering of rubber powder.

[0002]

2. Description of the Related Art In general, since a load from a toothed pulley is applied to a tooth rubber of a toothed belt, the tooth rubber is made of an elastic elastomer material, and the surface thereof is covered with an elastic tooth cloth. . Further, since the above-mentioned tooth rubber is repeatedly deformed during driving of the belt, it is necessary to strengthen the adhesiveness with the tooth cloth. Therefore, the tooth cloth is immersed in a resorcinol-formalin-rubber latex (RFL) liquid. After being subjected to a bonding treatment, a so-called rubberization for covering the rubber by a soaking treatment or a spreading treatment is generally performed.

However, in a toothed belt using a tooth cloth rubberized after the above-described bonding treatment, the rubber coated by the rubberization of the tooth cloth covers the surface of the tooth rubber and is exposed to the outside. As a result, the friction coefficient between the toothed pulley and the toothed pulley increases when the belt is driven, generating noise due to friction when the toothed belt and the toothed pulley mesh with each other, or abrasion of the rubber covering of the tooth cloth caused by the friction. There is a problem that the powder is scattered, and it is unsuitable for use in a place where the noise and the scattering of the rubber powder are disliked. For example, OA such as a printer
(Office automation) It is difficult to use for toothed belts for equipment and other general industries.

On the other hand, Japanese Patent Application Laid-Open Nos. Hei 7-190150 and Hei 8-35540 disclose that a tooth cloth covering a tooth rubber is only subjected to an adhesive treatment with an RFL solution and is not subjected to subsequent rubberization. The use of cloth is described.

More specifically, the solid content of resorcin-formaldehyde resin on tooth cloth is set to 30 to 50% by weight.
Alternatively, by adjusting the amount to 20 to 50% by weight, the opening surrounded by the thread of the tooth cloth is made small and difficult to expand, thereby preventing the tooth rubber from being exposed on the surface of the tooth cloth. This is to prevent scattering of rubber wear powder when the belt is used. Further, since there is no rubber coating rubber on the tooth cloth, the solid content of the RFL liquid on the surface of the tooth cloth comes into contact with the toothed pulley, thereby reducing the friction coefficient between the tooth cloth and the toothed pulley. It is intended to reduce noise to prevent the generation of noise and to eliminate the problem of scattering of the coated rubber wear powder.

In the production of a toothed belt, a tooth cloth is finished in a cylindrical shape, this is set in a mold, a core wire is wound thereon, and a rubber sheet is further wound thereon.
The rubber is molded and vulcanized by applying pressure and heat from the outside.

[0007]

However, if only the opening of the tooth cloth is reduced by the RFL treatment, the rubber (tooth rubber) is applied to the opening of the tooth cloth when the rubber is pressed from the outside during belt production. It often penetrates and is exposed on the cloth surface.
In addition, if the toothed belt is used for a long period of time, the gap surrounded by the yarns constituting the tooth cloth expands, and the tooth rubber may be exposed to the outside from the gap, thereby reducing noise and generation of rubber powder. It cannot be prevented reliably.

[0008] In general, tooth rubber has a black color because carbon black is blended in consideration of physical properties such as strength, and the black rubber is exposed to the outside through a gap surrounded by a thread constituting a tooth cloth. If exposed, the appearance will be dirty and the image will be down.

Further, when a tooth cloth which is not rubberized as described above is used, the adhesion between the tooth cloth and the core wire at the bottom of the tooth during vulcanization is deteriorated, and the load durability of the toothed belt is reduced. Become.

Therefore, the present invention can surely prevent the tooth rubber from being exposed to the surface of the tooth cloth (the image down due to the exposure of the black rubber and the contamination of peripheral devices due to the scattering of the black rubber wear powder) can be prevented. In addition, it is intended to reduce noise during belt running, and to improve the load durability of the belt.

[0011]

Means for Solving the Problems In order to achieve the above-mentioned object, one of the inventions of this application is to provide a specially compounded rubber between tooth rubber and tooth cloth, and to use a yarn constituting the tooth cloth. The rubber is prevented from being exposed to the outside from the enclosed gap.

Specifically, a back rubber in which the cord is embedded,
A belt body comprising a plurality of tooth rubbers arranged at a predetermined pitch in the longitudinal direction of the belt on the back rubber is provided, and a toothed belt having a tooth cloth attached to the tooth rubber side of the belt body is targeted. The following solution was taken.

In the invention according to the first aspect, a white rubber layer or a light rubber layer is interposed between the tooth rubber side of the belt main body and the tooth cloth. At this time, the white rubber layer or the light-color rubber layer is not exposed to the outside from the gap (texture or stitch) surrounded by the yarn constituting the tooth cloth. Further, a resorcinol-formaldehyde resin is added to the white or light-colored rubber layer.

According to the above construction, in the first aspect of the invention, the tooth rubber is covered with the white rubber layer or the light-color rubber layer, so that the tooth rubber is surrounded by the yarn constituting the tooth cloth over a long period of use. Even if the gap is enlarged, the black rubber of the tooth rubber is blocked by the white rubber layer or the light-colored rubber layer and is not exposed to the outside through the gap between the yarns of the tooth cloth. The rubber of the rubber layer is not exposed to the outside through the gap between the yarns of the tooth cloth, and only the tooth cloth comes into contact with the toothed pulley.

Therefore, when the belt is driven, the rubber constituting the tooth rubber or the white rubber layer or the light rubber layer does not come into contact with the toothed pulley, and the rubber constituting these does not scatter as rubber powder. Further, the coefficient of friction between the toothed belt and the toothed pulley is reduced, so that noise is reduced.

Further, even if the inner rubber can be seen from the gap between the yarns of the tooth cloth, the rubber is not the black rubber of the tooth rubber but the white rubber of the white rubber layer or the light rubber of the light rubber layer. Yes, without damaging the appearance. Therefore, it is suitably used as a toothed belt for OA equipment such as a printer and other general industries.

Further, the resorcinol-formaldehyde resin blended in the white rubber layer or the light rubber layer enhances the dynamic adhesive force and improves the load durability of the toothed belt.

According to a second aspect of the present invention, the above-mentioned tooth cloth is immersed in a resorcinol-formalin (RF) liquid, a resorcinol-formalin-rubber latex (RFL) liquid or a resin solution to perform an adhesive treatment. Further, a white rubber layer or a light-color rubber layer is interposed between the tooth rubber side of the belt main body and the tooth cloth. At this time, the white rubber layer or the light-color rubber layer is not exposed to the outside from the gap surrounded by the yarn constituting the tooth cloth. Further, a resorcinol-formaldehyde resin is added to the white or light-colored rubber layer.

According to the second aspect of the present invention, the contact with the toothed pulley is caused by the RF liquid adhering to the tooth cloth,
Only the solid content of the RFL solution or the resin solution provides the same function and effect as the invention according to claim 1. As the resin solution, a solution of an epoxy resin, a phenol resin, a melamine resin, or the like can be used.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the white rubber layer or the light-color rubber layer is formed by coating a tooth cloth with rubber or by rubber soaking. It is characterized by being formed by performing a treatment and a coating treatment.

According to the third aspect of the present invention, the white rubber layer or the light-color rubber layer is formed by a soaking process or a coating process, and the rubber is impregnated into the tooth cloth to form a toothed belt. Load durability is reliably obtained. In particular, when the soaking treatment is performed, the rubber surely impregnates the tooth cloth, and the load durability is further improved.

According to a fourth aspect of the present invention, in the invention according to the third aspect, the basis weight of the white rubber layer or the light-color rubber layer with respect to the tooth cloth is set to 40 to 150% by weight based on the weight of the tooth cloth. When the coating treatment is performed, the ratio of the basis weight by the soaking treatment is set to a range not exceeding 80% by weight.

According to the above configuration, in the invention according to the fourth aspect, the operation and effect of the third aspect can be reliably obtained.

According to a fifth aspect of the present invention, a rubber different from the tooth rubber is interposed in the gap between the yarns of the tooth cloth so that the rubber does not expose the tooth rubber to the surface of the tooth cloth.

That is, in the tooth cloth, the gap surrounded by the yarns constituting the tooth cloth is closed by rubber different from the tooth rubber, and the rubber interposed in the gap between the tooth cloth causes the tooth rubber to form a surface of the tooth cloth. Characterized by being prevented from being exposed.

According to this toothed belt, since the gap between the tooth cloths is closed by the rubber, the tooth rubber is not exposed on the surface of the tooth cloth. Therefore, scattering of the tooth rubber abrasion powder during use of the belt is prevented.

According to a sixth aspect of the present invention, the tooth rubber of the belt is formed of black rubber, the tooth cloth is formed of a twill fabric woven by nylon threads, and the tooth cloth is formed of a resorcinol-formaldehyde solution; A resorcin-formaldehyde-rubber latex liquid or a resin solution has been subjected to an adhesion treatment, and the tooth cloth is subjected to at least one of a soaking treatment and a coating treatment with a white rubber or a light-color rubber containing a resorcin-formaldehyde resin. The gap surrounded by the thread constituting the tooth cloth is closed by the rubber, and the penetration of the tooth rubber into the gap of the tooth cloth is caused by the rubber interposed in the gap of the tooth cloth. It is characterized by being blocked by less than 2/3 of the length.

The above-mentioned bonding process is performed from the viewpoint of strengthening the bonding force between the tooth cloth and the rubber of the toothed belt. As the resin solution, epoxy resin, phenol resin,
A solution such as a melamine resin can be employed.

The tooth rubber of the toothed belt is usually formed of black rubber. However, if white or light-colored rubber is used as the rubber of the tooth cloth, the black of the tooth rubber is completely formed by the white or light-colored rubber of the tooth cloth. The black rubber abrasion powder is not scattered because it is completely covered with the rubber, so that a sense of security can be given to the user.

When the toothed belt is manufactured by the method described above, the tooth rubber may be pressurized and enter the eyes of the tooth cloth. It is preferable that the penetration of the tooth rubber be reduced to 2/3 or less of the thickness of the tooth cloth, and more preferably to 1/3 or less. This is for surely preventing the generation of wear powder of the tooth rubber and for preventing the black color of the tooth rubber from appearing on the surface of the tooth cloth.

If the white rubber or light-colored rubber contains a resorcin-formaldehyde resin,
The adhesive strength between the tooth cloth and the rubber or the adhesive strength between the tooth cloth and the tooth rubber is increased, and the load durability life of the toothed belt is extended, and wear of the rubber of the tooth cloth is reduced, and scattering of abrasion powder is prevented. Is done.

The invention according to claim 7 is characterized in that the rubber interposed in the gap between the tooth cloths is thicker on the tooth bottom side than on the tooth tip side. The tooth bottom is a portion that collides with the teeth of the toothed pulley, and the thick rubber of the tooth cloth there means that it is advantageous for preventing the exposure of the tooth rubber and the scattering of the tooth rubber abrasion powder. .

According to an eighth aspect of the present invention, in the toothed belt according to the sixth aspect, the degree of penetration of the tooth rubber into the gap of the tooth cloth is smaller on the tooth bottom side than on the tooth tip side. I do. Thus, it is possible to reliably prevent the tooth rubber from being exposed even when the rubber of the tooth cloth is worn.

[0034]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIGS. 1 and 2 show a toothed belt 1 according to an embodiment of the present invention. The toothed belt 1 includes a belt main body 4 including a back rubber 2 and a tooth rubber 3, and a cord 5 is spirally embedded in the back rubber 2. The core wire 5 is made of, for example, a low-stretch, high-strength tensile body selected from polyester fiber, aliphatic polyamide fiber, aromatic polyamide fiber, rayon, glass fiber, steel wire and the like.

The tooth rubber 3 is provided on one surface of the back rubber 2 at a predetermined pitch in the longitudinal direction of the belt, for example, 1.0 to 3.2 m.
A plurality of the rubbers are arranged at a pitch of m and are integrally formed together with the back rubber 2 using the same rubber as a raw material. The rubber constituting the back rubber 2 and the tooth rubber 3, that is, the rubber constituting the belt body 4 is, for example, natural rubber (NR), styrene butadiene rubber (SBR), chloroprene rubber (C
R), a single material such as nitrile rubber (NBR), butyl rubber (IIR), or a rubber or polyurethane rubber (U) obtained by appropriately blending these materials. Normally, the rubber constituting the belt body 4 is mixed with carbon black in order to secure physical properties such as strength, and the belt body 4 has a black color.

A tooth cloth 6 is integrally attached to the belt rubber 4 side of the belt main body 4. The tooth cloth 6 is composed of a plain woven fabric, a twill woven fabric, a satin woven fabric or a knitted fabric such as a canvas, and is typically woven from a wooly-processed crimped nylon weft and a normal nylon warp. Woven fabric having elasticity, or a woven fabric woven with a warp yarn such as nylon or aramid fiber, which is made by covering an aromatic polyamide fiber or the like with a urethane elastic material to give elasticity. However, the present invention is not limited to this.

The above-mentioned tooth cloth 6 is immersed in a resorcin-formalin (RF) liquid, subjected to an adhesive treatment, and subjected to a drying step. Therefore, the solid content of the RF liquid adheres to the surface of the tooth cloth 6. I have. Note that a resorcinol-formalin-rubber latex (RFL) liquid or a solution of an epoxy resin, a phenol resin, a melamine resin, or the like may be used instead of the RF liquid.

As a feature of the present invention, the belt body 4
Between the tooth rubber 3 side and the tooth cloth 6 is a gap in which a white rubber layer 7 is surrounded by the yarns forming the tooth cloth 6 (in this example, the tooth cloth 6 is a canvas, and the belt width forming the cloth). Warp 6 extending in the direction
a and a weft 6b extending in the longitudinal direction of the belt, indicating a texture 6c) so as not to be exposed to the outside.

For example, the white rubber is coated on one side of the tooth cloth 6 after soaking or without soaking the white rubber, and the white rubber layer 7 is formed by a drying process. At this time, the viscosity of the white rubber is adjusted so as to be higher than that of the tooth rubber 3 so that the white rubber does not seep on the surface of the tooth cloth 6 opposite to the coating surface. Then, at the time of forming the belt, the core wire and the unvulcanized rubber sheet for forming the belt main body are superimposed on the coating surface of the tooth cloth 6, and the press-fitting is performed by a generally used press-fitting method. Thereby, the white rubber is impregnated into the tooth cloth 6 and the load durability of the toothed belt 1 can be reliably obtained. In particular, the tooth cloth 6 can be reliably impregnated with the white rubber by the soaking treatment, and the load durability can be further improved.

The rubber constituting the white rubber layer 7 may be the same rubber as the rubber constituting the belt body 4.
What is necessary is just to mix hydrated silica, titanium oxide, etc. instead of carbon black.

The rubber constituting the white rubber layer 7 is blended with a resorcinol-formaldehyde resin, thereby increasing the dynamic adhesive force and increasing the load durability of the toothed belt 1. The resorcin-formaldehyde resin is composed of, for example, Sumikanol 620 (methylene acceptor: manufactured by Sumitomo Chemical Co., Ltd.) and Sumicanol 508 (methylene donor: Sumitomo Chemical Co., Ltd.).

Further, the basis weight of the white rubber layer 7 with respect to the tooth cloth 6 is desirably 40 to 150% by weight based on the weight of the tooth cloth in order to ensure the load durability of the toothed belt 1, of which a soaking treatment is performed. When applying, it is desirable that the basis weight by soaking occupy not more than 80% by weight. Note that a light-colored rubber layer may be employed instead of the white-colored rubber layer 7.
The color may be inconspicuous even if it seeps out on the surface opposite to the coating surface of.

Next, an experimental example of the present invention will be specifically described.

Table 1 shows the rubber composition of the belt body 4 of the toothed belt 1. In Examples 1 to 5, the belt body 4 was made of this rubber composition.

[0046]

[Table 1]

Table 2 shows the rubber composition for treating the tooth cloth 6, that is, the rubber composition constituting the white rubber layer 7, and Table 3 shows the rubber composition for forming the white cloth.
Is a mixture of an RF solution for bonding, and all of Experimental Examples 1 to 5 were bonded with this RF solution.

[0048]

[Table 2]

[0049]

[Table 3]

The tooth cloth 6 used in the experimental example 1 was subjected to an adhesive treatment with an RF solution, soaked on only one surface with the compounded rubber shown in Table 2, and then further coated.
The white rubber is prevented from seeping out on the surface opposite to the coating surface of the tooth cloth 6.

The tooth cloth 6 used in the experimental example 2 was coated on one side with the compounded rubber shown in Table 2 on the one subjected to the adhesive treatment with the RF solution, and the white rubber was opposite to the coated side of the tooth cloth 6. The surface was not soaked on the side surface, and unlike the experimental example 1, no soaking treatment was performed.

The tooth cloth 6 used in Experimental Example 3 was coated with a compounded rubber on only one side and then further coated on an adhesive treatment with an RF solution.
Unlike Example 2, no resorcin-formaldehyde resin was blended.

The tooth cloth 6 used in the experimental example 4 was the same as the experimental example 2 except that the rubber cloth that had been subjected to the adhesive treatment with the RF solution was coated on only one side with the compounded rubber shown in Table 2 and was not subjected to the soaking treatment. However, the basis weight of the coating was smaller than that of Experimental Example 2, and the thickness of the white rubber layer 7 was smaller than that of Experimental Example 2.

The tooth cloth 6 used in the experimental example 5 is the same as the experimental example 1 in that the adhesive treated with the RF solution is soaked only on one side with the compounded rubber shown in Table 2 and then further coated. However, the basis weight of the coating was smaller than in Experimental Example 1, and the thickness of the white rubber layer 7 was smaller than in Experimental Example 1.

For the toothed belts 1 of Experimental Examples 1 to 5, "scatter of rubber powder" and "load durability life" were evaluated in the following manner, and the results were displayed together with "exposed rubber from tooth cloth". 4
Shown in

<Procedure of Experiment> The toothed belt 1 is wound around a driving pulley and a driven pulley, and is run for 1 hour at a rotation speed of 1000 rpm with tension applied thereto. The scattering of the powder was visually inspected. In parallel with this, the load durability life was also examined.

[0057]

[Table 4]

As is clear from Table 4, in Experimental Examples 1 and 2, good results were obtained in all evaluation items. But,
In Experimental Example 3, no resorcin-formaldehyde resin was compounded in the compounded rubber, and the load durability life was short.
In Experimental Example 4, since there was no soaking and the coating weight was small, all the evaluation items were bad. Experimental example 5
The soaking weight was almost the same as in Experimental Example 1 and the load durability life was good. However, since the coating weight was small and the thickness of the white rubber layer 7 was thin as a whole, the rubber was applied to the surface of the tooth cloth 6. It was exposed and scattering of rubber powder was also observed.

During the compounding of the rubber for treating the tooth cloth 6, if the amount of hydrated silica or titanium oxide is excessive and the viscosity becomes too high, or if the thickness of the rubber becomes too large, the teeth may be formed during belt molding. It is difficult for the shape of the rubber 3 to become regular,
It is necessary to take this into consideration when forming the belt, because the toothing property may be deteriorated.

<Second Embodiment> FIGS. 3 to 5 show a toothed belt 1 according to a second embodiment of the present invention. In this belt 1, the back rubber 2, the tooth rubber 3, and the core wire 5 are formed in the same manner as in the first embodiment, but the configuration of the tooth cloth 6 is different from that of the first embodiment. Belt body rubber 4
Is not provided with the white rubber layer 7.

The tooth cloth 6 is made of a plain woven cloth, a twill woven cloth, a satin woven cloth or a knitted fabric, is subjected to an adhesive treatment with an adhesive, and is further soaked or coated with a rubber different from the tooth rubber 3 on the woven or knitted cloth. The gap of the tooth cloth 6 is closed by the rubber. For example, a tooth cloth is constituted by a twill fabric woven by nylon threads, and the twill fabric is subjected to an adhesive treatment with a resorcin-formaldehyde solution, a resorcin-formaldehyde-rubber latex solution or a resin solution, and is soaked with white or light-colored rubber. Alternatively, it is preferable to apply a coating treatment to close the gap between the tooth cloths 6. This white or light-colored basis weight is 40 to
When the soaking treatment is performed, it is preferable that the basis weight by soaking occupies not more than 80% by weight.

As shown in FIG. 5, the tooth cloth rubber (the above-mentioned white rubber or light-colored rubber) 8 soaked or coated on the tooth cloth 6 is thin on the tooth tip surface 3a and thick on the tooth bottom surface 3b.
At the intermediate tooth surface, the thickness gradually increases from the tooth tip surface 3a to the tooth bottom surface 3b. Although the tooth rubber 3 slightly penetrates into the weave of the tooth cloth 6, the tooth rubber 3 intervening in the weave prevents the tooth rubber 3 from penetrating deeply.
The penetration is caused by the thickness 2 of the tooth cloth (twill fabric) 6 on the tooth tip surface 3a.
/ 3 or less at the tooth bottom 3b.

<Evaluation of Belt>-Example-The total denier per inch of the yarn woven by nylon yarn and extending in the belt width direction is 8000 to 130.
00 denier and elongation at break in the belt longitudinal direction is 11
The twill woven fabric set at 0 to 170% was immersed in an RF solution having the composition shown in Table 3, pulled up and dried.

Next, the twill woven fabric subjected to the RF treatment was subjected to a soaking treatment using a white rubber paste having the composition shown in Table 2 and further subjected to a coating treatment to obtain a tooth cloth material. The basis weight of the rubber paste is 70% by weight. This tooth cloth material was finished in a cylindrical shape and fitted into a mold for forming a toothed belt. In this mold, tooth grooves for forming belt teeth on the surface are formed at a constant pitch over the entire circumference.

Next, a cord for a core wire is spirally wound from above the tooth cloth of the above-mentioned mold, and a sheet of unvulcanized rubber having the composition shown in Table 1 is further wound from above, and pressure and heat are applied from the outside thereof. did.

As a result, a part of the unvulcanized rubber is extruded from the gap between the adjacent cords to the tooth space side of the mold, whereby the cloth for the tooth cloth is extended, and together with a part of the rubber, The rubber was pressed into the tooth space and the unvulcanized rubber was vulcanized. The belt material thus obtained was removed from the mold, and the resultant was cut into a ring to obtain the toothed belt 1 shown in FIGS.

-Comparative Example- Regarding the treatment of tooth cloth, an adhesive treatment was performed using an RFL (resorcin-formaldehyde-rubber latex) solution instead of the RF solution, and a soaking process and a coating process with a rubber paste were not performed. Except for this point, a toothed belt for comparison was produced under the same conditions and method as in the above example.

-Comparison- External Appearance In the toothed belt of the example, the tooth side of the tooth cloth was completely closed by the tooth cloth rubber formed of rubber paste, and the black tooth rubber was Did not appear. On the other hand, in the toothed belt of the comparative example, black tooth rubber was seen from the texture of the tooth cloth, and a portion where the black tooth rubber was completely exposed on the tooth cloth surface was also observed.

Regarding the rubber wear powder For each toothed belt of the example and the comparative example, the belt is wound around a driving pulley and a driven pulley, and the belt is run at a rotation speed of 1000 rpm for 1 hour in a state where a constant tension is applied to the belt. The presence or absence of rubber wear powder was examined. As a result, black rubber abrasion powder was slightly recognized in the comparative example, but tooth rubber abrasion powder was not recognized in the example.

[0070]

As described above, according to the invention of this application, a white rubber layer or a light rubber layer is interposed between the tooth cloth and the tooth rubber of the belt main body, and the white rubber layer or the white rubber layer is interposed. Since the light-colored rubber layer is not exposed to the outside, the coefficient of friction is lower than that of rubberized rubber, which is exposed on the surface of the tooth cloth. Noise at the time of meshing with the toothed pulley is significantly reduced. It is possible to provide a belt which is extremely suitable as a toothed belt for OA equipment such as a printer which dislikes them without dispersing powder and for other general industries. Also,
Since the resorcinol-formaldehyde resin is blended in the white rubber layer or the light-color rubber layer, the dynamic adhesive strength is increased and the load durability of the toothed belt can be improved.

Further, according to the one in which the gap of the tooth cloth is closed with a rubber different from the tooth rubber, the tooth rubber is not exposed on the surface of the tooth cloth, and scattering of abrasion powder of the tooth rubber when the belt is used is prevented. Therefore, it is possible to avoid contamination of the surroundings by the abrasion powder and malfunction of the device using the toothed belt.

Further, the tooth rubber is formed of black rubber, and the tooth cloth is formed of a twill fabric woven by nylon yarn, and the tooth cloth is formed of a resorcin-formaldehyde solution or a resorcin-formaldehyde-rubber latex solution or a resin solution. A white or light-colored rubber mixed with a resorcin-formaldehyde resin is soaked or coated so as to close the gaps of the tooth cloth, and the penetration of the tooth rubber into the gaps of the tooth cloth is performed. However, according to the above-mentioned rubber which is interposed in the gap between the tooth cloths, the thickness of the tooth cloth is reduced to 2/3 or less, so that the black of the tooth rubber is inconspicuous and the black rubber wear powder is not scattered. Can give the user a sense of security, and can reliably prevent the generation of black tooth rubber abrasion powder. , It extends the load durability of the toothed belt, scattering of abrasion powder of the rubber constituting the tooth cloth is prevented.

Further, the rubber interposed in the gap between the tooth cloths is
According to the one that is thicker on the tooth bottom side than on the tooth tip side, it is advantageous to prevent the tooth rubber from being exposed, and the degree of penetration of the tooth rubber into the gap of the tooth cloth is higher than that of the tooth tip side. According to the configuration in which the teeth are smaller on the tooth bottom side, the exposure of the tooth rubber can be surely prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a toothed belt according to a first embodiment.

FIG. 2 is a perspective view showing a part of the toothed belt.

FIG. 3 is a sectional view of a toothed belt according to a second embodiment.

FIG. 4 is a perspective view showing a part of the toothed belt.

FIG. 5 is a partially enlarged cross-sectional view of the toothed belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Toothed belt 2 Back rubber 3 Tooth rubber 4 Belt body 5 Core wire 6 Teeth cloth 6a Warp (yarn constituting tooth cloth) 6b Weft (yarn constituting tooth cloth) 6c Gap surrounded by yarn constituting tooth cloth (Texture) 7 White rubber layer 8 Tooth cloth rubber

Claims (8)

[Claims] 1. A belt body comprising a back rubber in which a core wire is embedded, and a plurality of tooth rubbers arranged at a predetermined pitch in the longitudinal direction of the belt on the back rubber. Between the tooth rubber side of the belt main body and the tooth cloth, a white rubber layer or a light-color rubber layer is surrounded by threads constituting the tooth cloth. It is interposed so as not to be exposed to the outside from the gap.
A toothed belt comprising a formaldehyde resin. 2. A belt body comprising a back rubber in which a core wire is embedded and a plurality of tooth rubbers arranged at a predetermined pitch in the longitudinal direction of the belt on the back rubber. A toothed belt having a tooth cloth attached thereto, wherein the tooth cloth is resorcinol-formalin liquid, resorcinol-
A formalin-rubber latex solution or a resin solution is immersed in the adhesive treatment, and between the tooth rubber side of the belt body and the tooth cloth, a white rubber layer or a light color rubber layer is surrounded by a yarn constituting the tooth cloth. Interposed so as not to be exposed to the outside from the gap formed by the resorcinol,
A toothed belt comprising a formaldehyde resin. 3. The toothed belt according to claim 1, wherein the white-colored rubber layer or the light-colored rubber layer is formed by applying a rubber coating to a tooth cloth, or by soaking and coating a rubber. A toothed belt formed by performing a process. 4. The toothed belt according to claim 3, wherein the basis weight of the white rubber layer or the light-color rubber layer with respect to the tooth cloth is:
It is 40 to 150% by weight based on the weight of the tooth cloth, and when the soaking treatment and the coating treatment are performed, the basis weight occupied by the soaking treatment does not exceed 80% by weight. Toothed belt. 5. A belt rubber body comprising a back rubber in which a core wire is embedded and a plurality of tooth rubbers arranged at a predetermined pitch in the longitudinal direction of the belt on the back rubber. A toothed belt having a tooth cloth adhered thereto, wherein the tooth cloth has a gap surrounded by a thread constituting the tooth cloth, which is closed by a rubber different from the tooth rubber; A toothed belt characterized in that the tooth rubber is prevented from being exposed on the surface of the tooth cloth by rubber interposed in the toothed belt. 6. A belt body comprising a back rubber in which a core wire is embedded, and a plurality of tooth rubbers arranged at a predetermined pitch in the longitudinal direction of the belt on the back rubber. A toothed belt having a tooth cloth adhered thereto, wherein the tooth rubber of the belt is formed of black rubber, and the tooth cloth is formed of a twill woven fabric woven with nylon yarns. A resorcinol-formaldehyde liquid, a resorcinol-formalin-rubber latex liquid, or a resin solution, and a soaking treatment and a coating treatment with a white rubber or a light-color rubber in which a resorcinol-formaldehyde resin is added to the tooth cloth. A gap surrounded by the yarn constituting at least one of the teeth and constituting the tooth cloth is closed by the rubber. The toothed belt is characterized in that the intrusion of the tooth rubber is prevented by the rubber interposed in the gap of the tooth cloth to 2/3 or less of the thickness of the tooth cloth. 7. The toothed belt according to claim 5, wherein the rubber interposed in the gap between the tooth cloths is thicker on the tooth bottom side than on the tooth tip side. Toothed belt. 8. The toothed belt according to claim 7, wherein the degree of penetration of the tooth rubber into the gap of the tooth cloth is smaller on the tooth bottom side than on the tooth tip side.