JP2021028256A - Toothed belt - Google Patents

Abstract

To provide a toothed belt capable of suppressing increase in width while acquiring the number of core cords necessary for an electrical signal and wiring of a power source.SOLUTION: A toothed belt according to the present invention comprises: a belt body; a plurality of tooth parts arranged at equal intervals in a length direction on one face of the belt body; and n (n is an integer of 3 or more) core cords buried in the belt body along the length direction. Among the n core cords, some adjacent core cords have conductivity and are arranged in such a manner that an average interval is smaller than a value obtained by dividing the average interval of two core cords located on an outermost side in a width direction of the belt body by (n-1).SELECTED DRAWING: Figure 1

Description

The present invention relates to a toothed belt.

Toothed belts are used for raising and lowering and transporting objects in factories and warehouses. The toothed belt is arranged along the length direction of the belt body, the tooth portions arranged on one surface of the belt body at equal intervals in the length direction, and the width direction of the belt. It is equipped with a plurality of core cords embedded in the main body.

The toothed belt includes an endless belt and an open belt having both ends. Of these, the toothed belt with an open belt configuration is fixed to the trolley so that its teeth can be fitted with the toothed pulley, and the trolley is moved up and down or left and right by rotationally driving the toothed pulley. Used for.

Some of the above trolleys are equipped with stoppers so that the loaded load does not slip off the trolley, for example. This stopper may be electrically controlled so as to be retractable so as not to be an obstacle when loading or unloading the trolley. In this way, the dolly is often equipped with an additional function controlled by electricity.

A toothed belt has been proposed in which wiring of an electric signal or power supply that controls such an additional function (hereinafter, also simply referred to as “wiring”) is also used as a core cord (see JP-A-2019-60403). .. In this toothed belt, since the core cord is made of a material that can be energized, it is also used as a power supply cable, so the wiring is embedded in the toothed belt while suppressing the increase in the thickness of the toothed belt. be able to.

JP-A-2019-60403

When the core cord of the toothed belt is also used as wiring, the number of core cords is determined by the number determined by the strength required for the toothed belt and the required number of wirings, whichever is greater. Therefore, as the number of wires increases, the number of core cords is determined by the number of wires, and the width of the toothed belt tends to increase unnecessarily. If the width of the toothed belt becomes unnecessarily large, it may be difficult to miniaturize a device incorporating the toothed belt, for example, a trolley.

The present invention has been made in view of such inconveniences, and an object of the present invention is to provide a toothed belt capable of suppressing an increase in width while securing the number of core cords required for wiring electric signals and power supplies.

As a result of diligent studies on a toothed belt in which the core cord is also used as wiring, the present inventor has focused on the following points. That is, in the conventional toothed belt in which the core cord is also used as the wiring, the distance between the adjacent core cords is determined so as to ensure the insulating property. On the other hand, since the core cord has a small diameter in general, one core cord has a high electric resistance, and the same electric signal or power supply is assigned to several core cords. Based on these facts, the present inventor has focused on the fact that it is not necessary to ensure the insulation between the core cords to which the same electric signal or power supply is assigned, and the distance between them can be narrowed. It was completed.

That is, the toothed belt of the present invention has a belt body, a plurality of tooth portions arranged at equal intervals in the length direction on one surface of the belt body, and the belt body along the length direction. It is provided with n core cords to be embedded (n is an integer of 3 or more), and among the n core cords, some adjacent core cords have conductivity and the belt body. The average spacing between the two core cords located on the outermost side in the width direction is smaller than the value obtained by dividing the average spacing by (n-1).

By reducing the average spacing between some of the adjacent core cords of the toothed belt, it is possible to suppress an increase in the width of the toothed belt with respect to the number of core cords. Further, in the toothed belt, by assigning the same electric signal or power supply to some adjacent core cords having a small average spacing, there is a problem of insulation between some of the adjacent core cords. Therefore, it is possible to suppress an increase in width while securing the number of core cords required for wiring.

It is preferable to form a bundle cord in which some of the adjacent core cords are substantially in contact with each other. By forming some of the adjacent core cords as bundled cords that are substantially in contact with each other in this way, the increase in the width of the toothed belt can be further suppressed with respect to the number of core cords. Can be done. Here, "substantially in contact" is a concept that includes not only the case where a part or all of them are actually in contact, but also the case where there is an inevitable slight gap, for example, an interval of 0.1 mm or less. Is.

The toothed belt may include the plurality of bundle cords. In this way, since the toothed belt is provided with the plurality of bundle cords, the bundle cords can be assigned to each of a plurality of electric signals or power supplies, and therefore, the width of the toothed belt is set with respect to the number of core cords. The increase can be further suppressed.

It is preferable that the bundle cord has three or more core cords. The bundle cord is not limited to two, and may be three or more. Since the bundled cord has three or more core cords in this way, the electric resistance can be further reduced, so that it can be suitably used for wiring an electric signal or a power supply.

It is preferable that the two core cords located on the outermost side in the width direction are single wire cords not included in the bundle cord. The electrical resistance of the two core cords located on the outermost side in the width direction may increase over time due to wear due to rubbing from the side surface of the toothed belt. Therefore, the reliability of the wiring can be improved by not including the two core cords located on the outermost side in the width direction in the bundle coat and not using them for the wiring of the electric signal or the power supply.

It is preferable that the n core cords include a single wire cord not included in the bundle cord, and the electrical resistivity of the core cord forming the bundle cord is lower than the electrical resistivity of the single wire cord. By lowering the electrical resistivity of the core cord used for the bundle cord in this way, the number of core cords included in the bundle cord can be reduced. Therefore, the increase in the width of the toothed belt can be further suppressed.

It is preferable that the average diameters of the n core cords are substantially equal. By making the average diameters of the n core cords substantially the same in this way, it is easy to secure the strength of the toothed belt. Here, "substantially equal" means that a difference that may occur due to manufacturing variation or the like, for example, a variation of 5% or less is allowed.

In addition, in this specification, "average" means the average of the numerical values measured at arbitrary 10 points. Further, the "average spacing of the core cords" means the average distance between the central axes of the core cords.

As described above, the toothed belt of the present invention can suppress an increase in width while securing the number of core cords required for wiring electric signals and power supplies.

It is a schematic perspective view which shows the toothed belt which concerns on one Embodiment of this invention. FIG. 5 is a schematic cross-sectional view taken along the line AA of the toothed belt of FIG. FIG. 5 is a schematic cross-sectional view taken along the line BB of the toothed belt of FIG. It is a schematic cross-sectional view which shows the toothed belt different from FIG. 3 is a schematic cross-sectional view showing a toothed belt different from FIGS. 3 and 4. 3 is a schematic cross-sectional view showing a toothed belt different from FIGS. 3 to 5. 3 is a schematic cross-sectional view showing a toothed belt different from FIGS. 3 to 6. 3 is a schematic cross-sectional view showing a toothed belt different from FIGS. 3 to 7.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

The toothed belt 1 shown in FIGS. 1, 2 and 3 has a belt main body 10, a plurality of tooth portions 20 arranged at equal intervals in the length direction on one surface of the belt main body 10, and the above-mentioned length. It includes twelve core cords 30 embedded in the belt body 10 along the direction.

<Belt body>
The main component of the belt body 10 is rubber or resin. Examples of the rubber include ethylene-α-olefin elastomers such as ethylene-propylene rubber (EPR) and ethylene propylene diene monomer rubber (EPDM), chloroprene rubber (CR), chlorosulfonated polyethylene rubber (CSM), and hydrogenated nitrile rubber (CSM). H-NBR) and the like can be mentioned. The rubber may be one of these, or may be a blend of two or more. Examples of the resin include thermoplastic polyester, polyamide, polyurethane and the like. As the main component of the belt body 10, a resin is preferable from the viewpoint of low dust generation, and a thermoplastic urethane having excellent wear resistance is particularly preferable. Here, the "main component" means a component having the highest content, preferably a component having a content of 50% by mass or more, more preferably 90% by mass or more.

The average thickness of the belt body 10 is appropriately determined depending on the strength required for the toothed belt 1 and the like, and can be, for example, 1 mm or more and 10 mm or less.

The length of the belt body 10 is appropriately determined according to the use of the toothed belt 1. The toothed belt 1 is mainly used as an open belt having both ends.

The belt body 10 may contain various additives. Examples of such additives include antioxidants, heat stabilizers, light stabilizers, antifogging agents, flame retardants, surface conditioners, pigments, fillers, waxes and the like.

<Tooth>
The tooth portion 20 is a convex portion having a trapezoidal, triangular, semicircular, chevron, corrugated, or normally distributed curved cross section. Further, the tooth portion 20 is arranged so that its ridge line (axial direction) coincides with the width direction of the belt main body 10.

The average height of the tooth portions 20 and the pitch between the tooth portions 20 are appropriately determined according to the use of the toothed belt 1. The average height of the tooth portion 20 can be, for example, 1.0 mm or more and 10 mm or less. The pitch between the tooth portions 20 can be, for example, 2 mm or more and 25 mm or less.

The main component of the tooth portion 20 can be the same as that of the belt body 10. Further, the tooth portion 20 may contain the same additives as the belt body 10.

<Core code>
The twelve core cords 30 are linear bodies having a circular cross section. As shown in FIG. 3, the twelve core cords 30 are arranged in the width direction of the belt body 10.

Further, the average diameters of the 12 core cords 30 are substantially the same. By making the average diameters of the 12 core cords 30 substantially equal in this way, it is easy to secure the strength of the toothed belt 1. The average diameter of the core cord 30 is appropriately determined according to the electrical resistance and the like required for the bundle cord 31, which will be described later, and can be, for example, 0.2 mm or more and 2.5 mm or less.

Further, as shown in FIG. 2, the 12 core cords 30 are parallel to the length direction of the belt body 10 and are the other surface of the belt body 10 (the surface on which the tooth portion 20 is not arranged). It is arranged so that the distance from the tooth is constant. That is, the twelve core cords 30 are arranged in a plane, and the plane formed by the core cords 30 is parallel to the surface of the belt body 10.

As shown in FIGS. 1 and 3, the twelve core cords 30 are a bundle cord 31 in which some adjacent core cords 30 are substantially in contact with each other, and a single wire cord not included in the bundle cord 31. 32 and is included.

The bundle cord 31 is mainly used as wiring for an electric signal or a power source in addition to reinforcing the toothed belt 1, and is pulled out from an end portion of the belt body 10 and used as shown in FIG. On the other hand, the single wire cord 32 is mainly used as a reinforcement of the toothed belt 1, and as shown in FIG. 1, the end portion thereof coincides with the end portion of the belt body 10.

(Bundle code)
The bundle cord 31 is composed of a core cord 30 having conductivity. Examples of such a core cord 30 include a steel cord and a copper cord. Of these, a steel cord is preferable from the viewpoint of the strength of the toothed belt 1, and a copper cord is preferable from the viewpoint of conductivity.

As described above, the bundle cord 31 is formed so that some of the adjacent core cords 30 are substantially in contact with each other. By forming some of the adjacent core cords 30 as bundle cords 31 that are substantially in contact with each other in this way, the width of the toothed belt 1 is further increased with respect to the number of core cords 30. It can be kept small.

Further, the toothed belt 1 may include a plurality of bundle cords 31. The number of bundle cords 31 is preferably the same as the number of types of electric signals or power supplies. By providing the toothed belt 1 with the plurality of bundle cords 31 in this way, the bundle cords 31 can be assigned to each of the plurality of electric signals or power supplies, so that the toothed belts can be assigned to the number of core cords 30. The increase in the width of 1 can be further suppressed.

The toothed belt 1 shown in FIG. 3 includes four bundle cords 31 (first bundle cord 31a, second bundle cord 31b, third bundle cord 31c, and fourth bundle cord 31d), but the number of bundle cords 31 is large. However, the number is not limited to this, and the number may be 3 or less, or 5 or more.

There is a gap between the plurality of bundle cords 31 and between the bundle cord 31 and the single wire cord 32. As the lower limit of the average distance between the plurality of bundle cords 31 and between the bundle cord 31 and the single wire cord 32, 0.3 mm is preferable, and 0.5 mm is more preferable. On the other hand, as the upper limit of the average interval, 4 mm is preferable, and 1 mm is more preferable. If the average interval is less than the above lower limit, the insulating property between the plurality of bundle cords 31 may not be sufficiently secured, and the flexibility of the toothed belt 1 may be insufficient. On the contrary, if the average interval exceeds the upper limit, the toothed belt 1 may become unnecessarily large in the width direction, and the strength, durability, driving accuracy, etc. of the toothed belt 1 by the core cord 30 and the like. There is a risk that the improvement effect of

As described above, there is a gap between the plurality of bundle cords 31 and between the bundle cord 31 and the single wire cord 32. On the other hand, the core cords 30 constituting the bundle cord 31 are in contact with each other. Therefore, of the 12 core cords 30, some of the adjacent core cords 30 constituting the bundle cord 31 are the two core cords 30 located on the outermost side in the width direction of the belt body 10 (FIG. In 3, it is arranged so as to be smaller than the value obtained by dividing the average spacing of the two single wire cords 32 by 11 (= 12-1) (the average value of the average spacing of the adjacent core cords 30). ..

The bundle cord 31 may have two core cords 30 like the first bundle cord 31a and the second bundle cord 31b, but like the third bundle cord 31c and the fourth bundle cord 31d. It is also possible to have a configuration having three or more core cords 30 (three in FIG. 3). Since the bundle cord 31 has three or more core cords 30 in this way, the electric resistance can be further reduced, so that it can be suitably used for wiring an electric signal or a power supply.

The number of core cords 30 included in this one bundle cord 31 can be appropriately determined according to the electric signal assigned to the bundle cord 31 or the resistance value required for the power supply.

(Single wire code)
The single wire cord 32 may be the same type of cord as the core cord 30 constituting the bundle cord 31, but may be a different type of cord. In this case, it is preferable that the electrical resistivity of the core cord 30 forming the bundle cord 31 is lower than the electrical resistivity of the single wire cord 32. By lowering the electrical resistivity of the core cord 30 used for the bundle cord 31 in this way, the number of core cords 30 included in the bundle cord 31 can be reduced in order to obtain the required resistance value. .. Therefore, the increase in the width of the toothed belt 1 can be further suppressed.

In particular, it is preferable to use an insulating cord as the single wire cord 32. By using the single wire cord 32 as an insulating cord, even if it comes into contact with the bundle cord 31, the function of the bundle cord 31 as an electric signal or a power source is unlikely to be affected. Examples of such an insulating cord include an aramid cord, a glass cord, a polyester cord and the like.

The toothed belt 1 is a single wire cord 32 in which the two core cords 30 located on the outermost side in the width direction of the belt body 10 are not included in the bundle cord 31. The electric resistance of the two core cords 30 (single wire cords 32) located on the outermost side in the width direction may increase over time due to wear due to rubbing from the side surface of the toothed belt 1. Therefore, the reliability of the wiring can be improved by not including the two core cords 30 located on the outermost side in the width direction in the bundle cord 31 and not using them for the wiring of the electric signal or the power supply.

As the lower limit of the average distance between the central axis of the single wire cord 32 arranged on the outermost side and the side surface of the belt body 10 adjacent thereto (also referred to as "the average distance between the single wire cord 32 and the side surface of the belt body 10"). Is preferably 0.3 mm, more preferably 0.5 mm. On the other hand, the upper limit of the average distance between the single wire cord 32 and the side surface of the belt body 10 is preferably 1 mm, more preferably 0.7 mm. If the average distance between the single wire cord 32 and the side surface of the belt body 10 is less than the above lower limit, the outermost single wire cord 32 is exposed from the side surface of the belt body 10 when the toothed belt 1 is manufactured. There is a risk. On the contrary, when the average distance between the single wire cord 32 and the side surface of the belt body 10 exceeds the upper limit, the side edge of the belt body 10 tends to flutter during driving, and the core cord 30 improves the driving accuracy. It may be insufficient.

<Manufacturing method of toothed belt>
The toothed belt 1 can be manufactured by, for example, a manufacturing method including an extrusion molding step and a tooth portion forming step.

(Extrusion molding process)
In the extrusion molding step, an extrusion molded product containing a rubber or resin composition in which a core cord 30 is embedded is formed by extrusion molding.

Specifically, while inserting a plurality of core cords 30 into a crosshead attached to the tip of a cylinder of an extruder, extrusion molding is performed so that both sides thereof are covered with a molten rubber or resin composition. Alternatively, the plurality of core cords 30 may be embedded in the rubber or resin composition by sandwiching the melt-extruded rubber or resin composition and the plurality of core cords 30 with a pair of rolls and applying pressure.

At this time, the core cords 30 constituting the bundle cord 31 are arranged so as to be in contact with each other, while the adjacent bundle cords 31 and between the bundle cord 31 and the single wire cord 32 are arranged with a gap. ..

The heating temperature for melting the rubber or resin composition in extrusion molding depends on the type of rubber or resin, the presence or absence of a curing agent, and the like, but the lower limit of the heating temperature is preferably 150 ° C. On the other hand, the upper limit of the heating temperature is preferably 250 ° C. If the heating temperature is less than the above lower limit, the rubber or resin composition may not be sufficiently melted, which may make extrusion molding difficult. On the contrary, when the heating temperature exceeds the upper limit, the extruded body becomes unnecessarily hot, so that the cooling time becomes unnecessarily long, and the manufacturing efficiency of the toothed belt 1 may decrease.

(Tooth formation process)
In the tooth portion forming step, the tooth portion 20 is formed on the extruded body after the extrusion molding step. Thereby, the toothed belt 1 can be obtained.

Specifically, for example, a cylindrical mold roll having a recess corresponding to the tooth portion 20 on the outer peripheral surface is prepared, and one surface of the extruded body is heated and wound around the mold roll to obtain teeth. The portion 20 can be formed.

The heating temperature in the tooth portion forming step is appropriately determined according to the temperature at which the extruded body can be melted to form the tooth portion 20 on one surface, but the lower limit of the heating temperature is preferably 150 ° C. .. On the other hand, the upper limit of the heating temperature is preferably 250 ° C. If the heating temperature is less than the above lower limit, the extruded body may be insufficiently softened and it may be difficult to form the tooth portion 20. On the contrary, if the heating temperature exceeds the upper limit, the entire toothed belt 1 may be easily deformed by heat.

<Advantage>
By reducing the average spacing between some of the adjacent core cords 30 of the toothed belt 1, the increase in the width of the toothed belt 1 can be suppressed to be small with respect to the number of core cords 30. Further, in the toothed belt 1, the same electric signal or power supply is assigned to some of the adjacent core cords 30 having a small average interval, thereby insulating the part of the adjacent core cords 30 from each other. Since the problem of sexuality can be avoided, an increase in width can be suppressed while securing the number of core cords 30 required for wiring.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and can be implemented in various modifications and improvements in addition to the above-described embodiment.

In the above embodiment, when a plurality of core cords having substantially the same average diameter include a bundle cord in which some adjacent core cords are substantially in contact with each other and a single wire cord not included in the bundle cord. However, the configuration of the core cord is not limited to this. Some modification examples will be described below. The components similar to those of the toothed belt 1 shown in FIG. 3 in each modification are designated by the same reference numerals and detailed description thereof will be omitted.

<Modification example 1>
The toothed belt 2 shown in FIG. 4 includes a belt body 10, a plurality of tooth portions 20 arranged at equal intervals in the length direction on one surface of the belt body 10, and a belt body along the length direction. It is provided with 12 core cords 30 embedded in 10.

In the toothed belt 2, the plurality of core cords 30 include a bundle cord 31 in which some of the adjacent core cords 30 are substantially in contact with each other, and a single wire cord 33 not included in the bundle cord 31. .. Further, in the toothed belt 2, the single wire cord 33 in which the two core cords 30 located on the outermost side in the width direction of the belt body 10 are not included in the bundle cord 31.

In the toothed belt 2, the average diameters of the 12 core cords 30 are not the same. In the toothed belt 2 shown in FIG. 4, the average diameters of the core cord 30 constituting the bundle cord 31 and the single wire cord 33 are different, and the core cord 30 constituting the bundle cord 31 is a single wire. The average diameter is larger than the code 33. By increasing the average diameter of the core cord 30 constituting the bundle cord 31 in this way, the electrical resistance of the bundle cord 31 can be further reduced, so that it can be suitably used for wiring an electric signal or a power supply.

On the contrary, the average diameter of the core cord 30 constituting the bundle cord 31 may be smaller than the average diameter of the single wire cord 33. In this case, the electrical resistance of the bundle cord 31 can be finely adjusted according to the number of core cords 30.

It is also an object of the present invention to have a configuration in which the average diameter of an arbitrary core cord 30 is changed, such as changing the average diameter of the core cord 30 for each bundle cord 31.

When the average diameters of the core cords 30 are not the same, it is preferable that the core cords 30 are arranged so that the tooth portions 20 side are aligned on the same plane. By arranging in this way, the manufacturing of the toothed belt 2 is facilitated.

<Modification 2>
The toothed belt 3 shown in FIG. 5 includes a belt body 10, a plurality of tooth portions 20 arranged at equal intervals in the length direction on one surface of the belt body 10, and a belt body along the length direction. It includes 13 core cords 30 embedded in 10.

In the toothed belt 3, the plurality of core cords 30 include a bundle cord 31 in which some of the adjacent core cords 30 are substantially in contact with each other, and a single wire cord 33 not included in the bundle cord 31. ..

In the toothed belt 3, the two core cords 30 located on the outermost side in the width direction of the belt body 10 are single wire cords 33 that are not included in the bundle cord 31, and single wires are formed between adjacent bundle cords 31. The code 33 is arranged. By arranging the single wire cord 33 between the adjacent bundle cords 31 in this way, the strength, durability, driving accuracy, etc. of the toothed belt 3 by the core cord 30 can be improved.

When the single wire cord 33 is arranged between the adjacent bundle cords 31, the single wire cord 33 is preferably an insulating cord. By using the single wire cord 33 as an insulating cord in this way, even if the distance between the bundle cord 31 and the single wire cord 33 is narrowed, problems such as a short circuit are unlikely to occur in the conductive bundle cord 31, so that the core body The increase in the width of the toothed belt 3 can be kept small with respect to the number of cords 30. As the insulating cord, a cord similar to the insulating cord described in the toothed belt 1 shown in FIG. 3 can be used.

Although FIG. 5 shows a case where one single wire cord 33 is arranged between adjacent bundle cords 31, a plurality of single wire cords 33 may be arranged. Further, the number may be changed depending on the arrangement position.

Further, although FIG. 5 shows a case where all the bundle cords 31 have two core cords 30, the number of core cords 30 included in the bundle cord 31 may be three or more, and the bundle cords 31 may have three or more core cords. It may be different for each code 31.

<Modification example 3>
The toothed belt 4 shown in FIG. 6 includes a belt main body 10, a plurality of tooth portions 20 arranged at equal intervals in the length direction on one surface of the belt main body 10, and a belt main body along the length direction. It is provided with 15 core cords 30 embedded in 10.

In the toothed belt 4, the plurality of core cords 30 include a bundle cord 31 in which some of the adjacent core cords 30 are substantially in contact with each other, and do not include a single wire cord not included in the bundle cord 31. .. Such a configuration that does not include a single wire cord is also an object of the present invention.

In the toothed belt 4, since the bundle cord 31 functions as a reinforcement of the toothed belt 4 at the same time as wiring, the single wire cord can be omitted. In the toothed belt 4 in which the single wire cord is omitted as described above, it is preferable to use a high-strength steel cord as the conductive core cord 30 constituting the bundle cord 31.

<Modification example 4>
The toothed belt 5 shown in FIG. 7 includes a belt body 10, a plurality of tooth portions 20 arranged at equal intervals in the length direction on one surface of the belt body 10, and a belt body along the length direction. It includes 21 core cords 30 embedded in 10.

In the toothed belt 5, the plurality of core cords 30 include bundle cords 34 in which some of the adjacent core cords 30 are substantially in contact with each other.

The bundle cord 34 is composed of three core cords 30. As shown in FIG. 7, the bundle cord 34 is arranged so that two core cords 30 are in contact with each other in the width direction of the belt body 10, and the other core cord 30 is the above two core cords. It is arranged so as to come into contact with 30 from the surface side of the belt body 10.

By providing the core body cord 30 arranged so as to be in contact with the surface side of the belt body 10 in this way, a plurality of core body cords 30 can be included in the bundle cord 34 without spreading in the width direction of the belt body 10. .. Therefore, the increase in the width of the toothed belt 5 can be further suppressed with respect to the number of core cords 30.

In FIG. 7, a case where three core cords 30 are included in one bundle cord 34 has been described, but the number of core cords 30 included in one bundle cord 34 is not limited to three. For example, there may be four or more. Further, the number of cords included in each bundle code 34 may be different.

Further, although FIG. 7 has described the case where the plurality of core cords 30 do not include the single wire cord, the single wire cord may be included.

<Modification 5>
The toothed belt 6 shown in FIG. 8 includes a belt body 10, a plurality of tooth portions 20 arranged at equal intervals in the length direction on one surface of the belt body 10, and a belt body along the length direction. It is provided with eight conductive core cords 30 embedded in the ten.

In the toothed belt 6, as shown in FIG. 8, the eight core cords 30 are connected to the adjacent core cords 30 in order from the core cord 30 located on the outermost side in the width direction of the belt body 10. The average interval is narrow / wide repeatedly. That is, of the eight core cords 30, some of the adjacent core cords 30 have conductivity, and the average of the two core cords 30 located on the outermost side in the width direction of the belt body 10. The intervals are arranged so that the average interval is smaller than the value obtained by dividing the interval by 7 (= 8-1).

Such a configuration is also an object of the present invention, and the same electric signal or power supply is assigned to two adjacent core cords 30 having a narrow average interval.

Of the two adjacent core cords 30, the lower limit of the ratio between the narrow average spacing (D1 in FIG. 8) and the wide average spacing (D2 in FIG. 8) is preferably 2: 3, more preferably 1: 4. Preferably, 1:10 is even more preferred. If the ratio is less than the lower limit, the effect of reducing the width of the toothed belt 6 may be insufficient. On the other hand, the upper limit of the above ratio is not particularly limited. That is, the narrow average spacing of the two adjacent core cords 30 may be 0.

In the toothed belt 6 shown in FIG. 8, the case where the average distance between the adjacent core cords 30 and the core cord 30 is narrow / wide is repeated, but for example, every two cords may be repeated narrow / wide, and repeated. The number may vary depending on the arrangement position of the core cord 30.

<Others>
In the above embodiment, the case where a specific number of core cords is provided has been described, but the number of core cords is not limited to the number of each embodiment as long as the number of core cords is 3 or more.

In the above embodiment, the case where the bundle cord is used as wiring for an electric signal or a power supply and the single wire cord is used for reinforcement has been described, but there may be a bundle cord that is not used as wiring, and conversely, the single wire cord used as wiring. There may be.

The toothed belt of the present invention can suppress an increase in width while securing the number of core cords required for wiring electric signals and power supplies.

1, 2, 3, 4, 5, 6 Toothed belt 10 Belt body 20 Tooth part 30 Core cord 31, 34 Bundle cord 31a 1st bundle cord 31b 2nd bundle cord 31c 3rd bundle cord 31d 4th bundle cord 32 , 33 Single wire cord

Claims (7)

With the belt body
A plurality of teeth arranged at equal intervals in the length direction on one surface of the belt body,
It is provided with n core cords (n is an integer of 3 or more) embedded in the belt body along the length direction.
Of the n core cords, some of the adjacent core cords have conductivity, and the average distance between the two core cords located on the outermost side in the width direction of the belt body is set to (n). A toothed belt arranged so that the average interval is smaller than the value divided by -1). The toothed belt according to claim 1, wherein a bundle cord in which some of the adjacent core cords are substantially in contact with each other is formed. The toothed belt according to claim 2, further comprising the plurality of bundle cords. The toothed belt according to claim 2 or 3, wherein the bundle cord has three or more core cords. The toothed belt according to claim 2, claim 3 or claim 4, wherein the two outermost core cords in the width direction are single wire cords not included in the bundle cord. The n core cords include a single wire cord not included in the bundle cord,
The toothed belt according to any one of claims 2 to 5, wherein the electrical resistivity of the core cord forming the bundle cord is lower than the electrical resistivity of the single wire cord. The toothed belt according to any one of claims 1 to 6, wherein the average diameters of the n core cords are substantially the same.

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