Belt

Abstract

A belt according to one embodiment of the present invention comprises: a belt main body; one or a plurality of core flexible wires for energization, each core flexible wire comprising a conductive core wire; and one or a plurality of reinforcing core flexible wires having a higher electrical resistance per unit length than the energizing core flexible wire, the energizing core flexible wire and the reinforcing core flexible wire being embedded in the tape main body along the longitudinal direction at intervals in the width direction of the tape main body. The core flexible wire for energization has a coating film that constitutes a peripheral surface so as to cover the core wire, and the coating film is welded to the tape main body.

Description

Technical Field

[0001] The present invention relates to a belt. Background Art

[0002] Belts are sometimes used to lift or transport items in factories or warehouses. In this case, for example, a trolley is fixed to the belt using screws through through holes in the belt, and the trolley is moved up and down or left and right by rotating a pulley that drives the belt. The items are placed on the trolley to be lifted or transported.

[0003] For example, some of the above-mentioned carts are equipped with stoppers to prevent the loaded goods from slipping off the cart. The stoppers are sometimes electrically controlled to be retractable so as not to become an obstacle when loading goods on the cart or unloading goods. In this way, there are many cases where additional functions controlled by electricity are installed in carts.

[0004] A belt in which the wiring for controlling the electrical signal or power supply of such an additional function (hereinafter also referred to as "wiring") also serves as a core cord is proposed (see Japanese Patent Publication No. 2019-60403). In the belt, the core cord is made of a material that can conduct electricity and also serves as a power supply cable, thereby suppressing an increase in the thickness of the belt and burying the wiring in the belt.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-60403 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In such a belt in which the core cord has an energizing function, since the wiring is connected to the core cord that has the energizing function, tension may be applied to the core cord in a direction different from the movement of the belt. Therefore, the core cord and the belt body may be easily separated, and the belt may fail.

[0010] The present invention has been made in view of such inconveniences, and an object of the present invention is to provide a belt in which the core cord is prevented from being separated from the belt body even when the core cord is used as wiring for electric signals or power supply.

[0011] Technical means of solving problems

[0012] A belt according to one embodiment of the present invention includes: a belt body; one or more core soft wires for carrying electricity, including a core wire with conductivity; and one or more reinforcing core soft wires, whose resistance per unit length is higher than that of the core soft wire for carrying electricity, and the core soft wire for carrying electricity and the reinforcing core soft wire are buried in the belt body along the length direction at intervals in the width direction of the belt body, and the core soft wire for carrying electricity has a coating film that forms a circumferential surface in a manner that covers the core wire, and the coating film is fused to the belt body.

[0013] Effects of the Invention

[0014] Even when the core cord is used as wiring for electric signals or power supply, the belt of the present invention can prevent the core cord from being separated from the belt body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] [ Figure 1 ] Figure 1 This is a schematic perspective view showing a belt according to one embodiment of the present invention.

[0016] [ Figure 2 ] Figure 2 yes Figure 1 Schematic cross-sectional view of the belt at line AA.

[0017] [ Figure 3 ] Figure 3 yes Figure 1 Schematic cross-sectional view of the belt at line BB.

[0018] [ Figure 4 ] Figure 4 Yes means Figure 1 A schematic three-dimensional view of a reinforcing core cord near a belt hole.

[0019] [ Figure 5 ] Figure 5 It means Figure 4 Schematic stereogram of the reinforcing core cord near the holes with different structures.

[0020] [ Figure 6 ] Figure 6 It means Figure 1 Schematic perspective views of belts according to various embodiments.

[0021] [ Figure 7 ] Figure 7 is with Figure 3 and Figure 6 Schematic cross-sectional views of belts according to various embodiments. DETAILED DESCRIPTION

[0022] [Description of Embodiments of the Invention]

[0023] First, embodiments of the present invention will be listed and described.

[0024] A belt according to one embodiment of the present invention includes: a belt body; one or more core soft wires for carrying electricity, including a core wire with conductivity; and one or more reinforcing core soft wires, whose resistance per unit length is higher than that of the core soft wire for carrying electricity, and the core soft wire for carrying electricity and the reinforcing core soft wire are buried in the belt body along the length direction at intervals in the width direction of the belt body, and the core soft wire for carrying electricity has a coating film that forms a circumferential surface in a manner that covers the core wire, and the coating film is fused to the belt body.

[0025] In the belt, the power core cord has a core and a coating, so when the wiring is connected to the power core cord, the tension applied to the core cord is transmitted to both the core and the coating. The coating is fused to the belt body, so the tension in the same direction acts on both the belt body and the power core cord. Therefore, the belt can prevent the power core cord from peeling off from the belt body.

[0026] The main component of the belt body may be an elastomer, and the main component of the covering film may be polyethylene or polyester. Thus, by setting the main component of the belt body to be an elastomer and the main component of the covering film to be polyethylene or polyester, the covering film can be easily welded to the belt body.

[0027] The elastic body may be a flame retardant material. Thus, by using the elastic body as a flame retardant material, it is possible to reliably suppress ignition of the belt body due to leakage or the like.

[0028] The belt may include a cover layer having a friction coefficient lower than that of the belt body and covering one or both sides of the belt body. Thus, by providing the cover layer with a low friction coefficient, the belt may be made into a belt with excellent wear resistance during use.

[0029] The main component of at least one side of the cover layer may be nylon resin or fluorine resin. Thus, by setting the main component of the cover layer to nylon resin or fluorine resin, the friction coefficient of the cover layer can be reduced.

[0030] The belt may include a cover layer, which has a higher hardness than the belt body and covers one or both sides of the belt body. Thus, by providing a cover layer with high hardness, the strength of the belt or the wear resistance can be improved.

[0031] The main component of at least one side of the cover layer may be a thermoplastic elastomer resin. By making the main component of the cover layer a thermoplastic elastomer resin, the belt body and the cover layer are unlikely to be separated.

[0032] The Japanese Industrial Standards (JIS)-A hardness of the belt body is preferably 70 or more and less than 100. By setting the JIS-A hardness of the belt body within the above range, the power transmission efficiency can be improved while suppressing a decrease in strength.

[0033] The belt body may have a core support portion on at least one side, the core support portion being a recessed portion for supporting the power core cord and the reinforcing core cord, and the core support portion being covered. Thus, by having the core support portion, it is easy to control the buried positions of the power core cord and the reinforcing core cord when manufacturing the belt. In addition, by covering the core support portion, it is possible to suppress the power core cord from short-circuiting with other conductors when using the belt.

[0034] The outermost core cords in the width direction may be reinforcing core cords. The outermost core cords in the width direction may have their resistance increased over time due to wear and tear caused by friction from the side of the belt. Therefore, by setting the outermost core cords in the width direction as reinforcing core cords and not using them for wiring of electrical signals or power supply, the reliability of wiring can be improved.

[0035] The belt may include a plurality of core cords for conducting, and the reinforcing core cord may be disposed between adjacent core cords for conducting. Thus, by disposing the reinforcing core cord between adjacent core cords for conducting, it is possible to suppress a local decrease in the strength of the belt.

[0036] The core wire group may be formed by providing a plurality of the core wires for power supply, and two or more and five or less of the core wires for power supply are continuously adjacent to each other. By forming the core wire group, it is easy to connect in parallel wiring such as power wiring that requires low resistance. In addition, when the core wires for power supply are used in parallel for the same signal, the average interval between the core wires for power supply constituting the core wire group can be narrowed, thereby further suppressing the increase in the width of the belt.

[0037] The core wire of the power supply core soft wire may be a soft copper wire or a copper alloy wire. Copper has a low resistance per unit length and is suitable for power supply purposes. In addition, since the soft copper wire and the copper alloy wire are easy to bend, the occurrence of undesirable situations such as wire breakage can be suppressed.

[0038] The core wire of the power-carrying core wire may be a single wire, a collectively twisted wire, or a rope-twisted wire. By setting the core wire of the power-carrying core wire to be a single wire, the cross section of the core becomes the densest, so it is easy to make the core wire low-resistance. In addition, by setting the core wire of the power-carrying core wire to be a collectively twisted wire or a rope-twisted wire, the strength of the core is improved, which can suppress the occurrence of undesirable situations such as wire breakage, and the bending fatigue resistance of the belt can be improved.

[0039] The power supply core wire may be a shielded wire, a cable or a shielded cable. Thus, by setting the power supply core wire as a shielded wire, a cable or a shielded cable, the noise immunity of the power supply core wire can be improved.

[0040] The belt body may have one or more belt holes penetrating in the thickness direction. Thus, by providing one or more belt holes in the belt body, it is easy to fix the belt to a carriage or the like.

[0041] The core cord for power supply may include a connector at least at one end thereof. Thus, by providing a connector at at least at one end of the core cord for power supply, wiring of the belt and other devices can be easily performed.

[0042] The belt may be a flat belt. The belt may be preferably used for a flat belt that needs an electrification function.

[0043] The belt may be a toothed belt including a plurality of teeth arranged at equal intervals in the length direction on one surface of the belt body. The belt may be preferably used as a toothed belt requiring an electric conduction function.

[0044] Here, the term "main component" refers to the component with the largest content, preferably a component with a content of 50% by mass or more, and more preferably a component with a content of 90% by mass or more. The term "JIS-A hardness" refers to the hardness measured by placing the needle of a type A hardness tester on a fixed belt surface according to JIS-K-7312:1996 (A method).

[0045] In addition, "friction coefficient" refers to the value measured according to the following process. Cut a test piece of 5 cm × 15 cm square from the belt. Fix the test piece to a static friction coefficient measuring machine (for example, static friction measuring machine model (TYPE): 10 manufactured by Shinto Chemical Co., Ltd.). Fix refined steel on the test piece, raise the base of the measuring machine, read the scale when the refined steel moves, and set it as the friction coefficient value.

[0046] [Details of the embodiments of the present invention]

[0047] A belt according to an embodiment of the present invention will be described with reference to the drawings.

[0048] [First embodiment]

[0049] Figure 1 , Figure 2 and Figure 3 The belt 1 shown comprises: a belt body 10, four core flexible wires 20 for power transmission, six core flexible wires 30 for reinforcement, and a cover layer 40. The belt 1 is a flat belt and can be preferably used for a flat belt requiring power transmission function.

[0050] In addition, the belt body 10 has one or more (in Figure 1 The belt holes 11 are three in the figure, and the core soft wires 20 for power supply and the core soft wires 30 for reinforcement are buried in the belt body 10 along the length direction at intervals in the width direction of the belt body 10.

[0051] <With body>

[0052] The main component of the belt body 10 is rubber or resin. Examples of the rubber include ethylene-propylene rubber (EPR) or ethylene propylenediene monomer rubber (EPDM) and other ethylene-α-olefin rubbers, chloroprene rubber (CR), chlorosulfonated polyethylene rubber (CSM), hydrogenated nitrile rubber (H-NBR), etc. The rubber may be one of these or a mixture of two or more. Examples of the resin include thermoplastic polyesters, polyamides, polyurethanes, etc.

[0053] Among them, the main component of the belt body 10 is preferably an elastomer such as ethylene-α-olefin rubber, thermoplastic polyurethane, polyamide, polyester, etc., and more preferably thermoplastic polyurethane, polyamide and polyester. Thermoplastic polyurethane is excellent in low dust generation and wear resistance. Polyamide is excellent in oil resistance, chemical resistance and wear resistance. Polyester is excellent in water resistance, low temperature flexibility, strength and fatigue resistance. In addition, the elastomer can be a flame retardant raw material. In this way, by setting the elastomer as a flame retardant raw material, it is possible to reliably suppress the ignition of the belt body 10 caused by leakage or the like.

[0054] The average thickness of the belt body 10 is appropriately determined depending on the strength required of the belt 1 and the like, and can be set to, for example, 1 mm or more and 10 mm or less.

[0055] The width and length of the belt body 10 are appropriately determined according to the use of the belt 1. The belt 1 is mainly used as an open belt having both ends.

[0056] The lower limit of the JIS-A hardness of the belt body 10 is preferably 70, more preferably 75. On the other hand, the JIS-A hardness of the belt body 10 is preferably less than 100, more preferably less than 95, and further preferably less than 80. If the JIS-A hardness of the belt body 10 is less than the lower limit, the strength of the belt body 10 and thus the strength of the belt 1 may be insufficient. On the other hand, if the JIS-A hardness of the belt body 10 is greater than the upper limit, the power transmission efficiency of the belt 1 may be reduced.

[0057] like Figure 1 and Figure 2 As shown, in the belt 1, the belt body 10 has a plurality of core support portions 20a on one side (driving side), and the core support portions 20a are recessed portions for supporting the core cord 20 for power supply and the core cord 30 for reinforcement. When manufacturing the belt 1, the belt body 10 can be manufactured by, for example, extrusion molding while supporting the core cord 20 for power supply and the core cord 30 for reinforcement using the plurality of core support portions 20a. That is, in this way, by having the core support portions 20a, it is easy to control the buried positions of the core cord 20 for power supply and the core cord 30 for reinforcement when manufacturing the belt 1.

[0058] The core support portion 20a is preferably covered. In the belt 1, it is covered by the second cover layer 42 described later. By covering the core support portion 20a, it is possible to prevent the power core cord 20 from short-circuiting with other conductors when the belt 1 is used.

[0059] The belt main body 10 may contain various additives. Examples of such additives include antioxidants, heat stabilizers, light stabilizers, antifogging agents, flame retardants, surface conditioning agents, pigments, fillers, waxes, and the like.

[0060] The belt hole 11 is used, for example, to fix a connecting object such as a trolley to the belt 1. Specifically, for example, a screw is inserted to fasten the belt 1. The cross-sectional shape of the belt hole 11 is not particularly limited, and is generally a circular shape. The following description is based on the premise that the cross-sectional shape of the belt hole 11 is a circular shape, but other shapes are not excluded.

[0061] The belt hole 11 may be single, but in order to suppress the rotation of the connected object, it is preferably provided with multiple holes. In addition, the number of belt holes 11 may be set to three or more according to the weight of the connected object. Alternatively, the belt hole 11 may be provided to be more than the number of fastenings to the connected object so that the mounting position can be adjusted.

[0062] The belt hole 11 is preferably provided at the center portion in the width direction of the belt body 10. By providing the belt hole 11 at the center portion in the width direction of the belt body 10, the connection object can be stably connected.

[0063] In addition, the belt hole 11 is generally provided at one or both ends in the longitudinal direction of the belt body 10. This is because the connection object is often connected to the ends of the belt body 10 in the longitudinal direction.

[0064] In the case where a plurality of belt holes 11 are provided, the plurality of belt holes 11 are arranged side by side with their centers along the length direction. The distance between adjacent belt holes 11 is appropriately determined so that the connection object can be fastened. The plurality of belt holes 11 are preferably arranged side by side at equal intervals. By arranging the plurality of belt holes 11 side by side at equal intervals in this way, the pressure applied to the belt body 10 is easily evenly dispersed when the connection object is fastened, and it is possible to prevent the pressure from being locally concentrated and damaging the belt body 10.

[0065] The lower limit of the diameter of the belt hole 11 is preferably 2 mm, and more preferably 3 mm. On the other hand, the upper limit of the diameter of the belt hole 11 is preferably 7 mm, and more preferably 6 mm. If the diameter of the belt hole 11 is less than the lower limit, the fastening strength with the connecting object may not be sufficiently ensured. On the contrary, if the diameter of the belt hole 11 exceeds the upper limit, the strength of the belt body 10 near the belt hole 11 may be insufficient, or the number of cords of the core cord 20 for power supply may not be sufficiently ensured.

[0066] <Core cord for power supply>

[0067] The core cord 20 for conducting electricity is a linear body, for example, having a circular cross section. Figure 3 As shown, the current-carrying core cord 20 includes a core wire 21 having conductivity, and has a coating film 22 constituting a peripheral surface so as to cover the core wire 21 .

[0068] In addition, if Figure 1 As shown, the core cord 20 for power supply may have a connector 23 at least on one end. The connector 23 is a member for connecting the core cord 20 for power supply to a signal line outside the belt 1. In this way, by providing the connector 23 at at least one end of the core cord 20 for power supply, wiring between the belt 1 and other devices can be easily performed. In addition, the connector 23 may also be provided at both ends of the core cord 20 for power supply.

[0069] The core cord 20 for power supply may be a shielded wire, a cable, or a cable with a shield. Thus, by setting the core cord 20 for power supply as a shielded wire, a cable, or a cable with a shield, the noise immunity of the core cord 20 for power supply may be improved.

[0070] The lower limit of the average diameter of the core soft wire 20 for power supply is preferably 0.2 mm, more preferably 0.5 mm, and further preferably 1 mm. On the other hand, the upper limit of the average diameter of the core soft wire 20 for power supply is preferably 2.5 mm, and more preferably 1.5 mm. If the average diameter of the core soft wire 20 for power supply is less than the lower limit, the resistance of the core soft wire 20 for power supply cannot be sufficiently reduced, and it may not be able to fully function as an electrical signal or power supply. On the contrary, if the average diameter of the core soft wire 20 for power supply exceeds the upper limit, the width of the belt 1 may become too large. Here, the so-called "average diameter" refers to the average value of the diameter measured at any 10 points. Herein, all "averages" are the same. That is, the so-called "average" refers to the average calculated based on the values ​​measured at any 10 points of the measured object.

[0071] (core wire)

[0072] As the core wire 21, steel wire or copper wire can be cited. Among them, copper wire is preferred, and soft copper wire or copper alloy wire is more preferred. Copper wire has low resistance per unit length and is suitable for power supply purposes. In addition, since soft copper wire and copper alloy wire are easy to bend, it is possible to suppress the occurrence of undesirable situations such as disconnection.

[0073] The core wire 21 of the core body soft wire 20 for power supply can be a single wire, a collective stranded wire, or a rope stranded wire. By making the core wire 21 of the core body soft wire 20 for power supply a single wire, the cross section of the core wire 21 becomes the densest, so it is easy to make the core wire 21 low in resistance. In addition, by setting the core wire 21 of the core body soft wire 20 for power supply as a collective stranded wire or a rope stranded wire, the strength of the core wire 21 is improved, and the occurrence of undesirable situations such as wire breakage can be suppressed, and the bending fatigue resistance of the belt 1 can be improved.

[0074] (Coating)

[0075] The coating film 22 may be made of an insulator. By making the coating film 22 of an insulator, it is possible to suppress changes in the electrical characteristics when the power core cord 20 contacts other power core cords 20. In addition, since the belt 1 is manufactured while supporting the power core cord 20 from below, Figure 2 As shown, at its supporting point, the belt 1 after manufacture sometimes has a core support portion 20a where a part of the power core cord 20 is exposed from the belt body 10. In this way, even if there is a core support portion 20a, the coating film 22 made of an insulator can prevent short circuits or electric shocks when current flows through the power core cord 20.

[0076] The covering film 22 is welded to the belt body 10. That is, the covering film 22 maintains its original shape, and the belt body 10 and the covering film 22 are heated and melted at the interface with the belt body 10 to be welded.

[0077] The melting point of the main component of the coating film 22 may be lower than the melting point of the main component of the belt body 10. In this way, by making the melting point of the main component of the coating film 22 lower than the melting point of the main component of the belt body 10, the forming temperature of the belt 1 during manufacturing is set to be higher than the melting point of the coating film 22, and the coating film 22 can be reliably welded.

[0078] When the main component of the belt body 10 is an elastomer, the main component of the coating film 22 may be polyethylene or polyester. Thus, by making the main component of the belt body 10 an elastomer and the main component of the coating film 22 polyethylene or polyester, the coating film 22 can be easily welded to the belt body 10.

[0079] (Relationship with hole)

[0080] like Figure 3 As shown in FIG. 1 , the hole 11 can be provided on the reinforcing core cord 30 described later. That is, the reinforcing core cord 30 can be cut through the hole 11. In this case, Figure 4 As shown, the portion of the reinforcing core cord 30 exposed in the hole 11 is cut off ( Figure 4 The cut-off portion 30a) may also be Figure 5 As shown, the portion of the reinforcing core cord 30 corresponding to the hole 11 ( Figure 4 In either case, the reinforcing core cord 30 reinforces the area where the belt hole 11 is not provided. On the other hand, since the belt hole 11 loses electrical connection, it cannot be provided on the power supply core cord 20. In other words, the power supply core cord 20 is arranged to avoid the belt hole 11.

[0081] Here, the distance of the power-carrying core soft wire 20 from the belt hole 11 is studied. A screw is inserted into the belt hole 11 to fasten the connection object to the belt 1. Since the upper surface of the screw is structurally larger in diameter than the belt hole 11, when the screw is tightened to fix the belt 1 to the connection object, the upper surface of the screw is pressed against the belt 1. At this time, if the power-carrying core soft wire 20 is arranged in the area close to the upper surface of the screw, the resistance value of the power-carrying core soft wire 20 changes due to the pressing pressure, and the desired electrical characteristics may not be obtained. Therefore, the power-carrying core soft wire 20 needs to be away from the belt hole 11 by a certain distance so that the electrical characteristics will not change due to the pressing force of the screw. Specifically, as the distance between the power-carrying core soft wire 20 and the periphery of the belt hole 11 ( Figure 3 The lower limit of the distance D) shown is preferably 0.5 mm, more preferably 0.7 mm. On the other hand, the upper limit of the distance D is not particularly limited, but from the perspective of being unable to configure the required number of core wires 20 for power transmission if it is too large, it can be set to 5 mm, for example.

[0082] <Reinforcement core cord>

[0083] The reinforcing core cord 30 is a linear body, and has, for example, a circular cross section. The reinforcing core cord 30 includes a core wire 31 , and has a higher resistance per unit length than the conducting core cord 20 .

[0084] The core wire 31 of the reinforcing core body soft wire 30 may be made of the same material as the core wire 21 of the power core body soft wire 20, but the core wire 31 of the reinforcing core body soft wire 30 may be made of a material different from that of the core wire 21 of the power core body soft wire 20. In this way, by making the core wire 31 of the reinforcing core body soft wire 30 different from the core wire 21 of the power core body soft wire 20, a core wire with low resistivity can be used as the core wire 21 of the power core body soft wire 20, so it is easy to reduce the number of parallel connections of the power core body soft wire 20 for ensuring the required resistance. Among them, it is preferable to make the core wire 21 of the power core body soft wire 20 a copper wire with low resistivity and the core wire 31 of the reinforcing core body soft wire 30 a polyaramid wire with insulation.

[0085] In addition, when the core wire 31 of the reinforcing core body soft wire 30 has conductivity, it is preferred that the core wire 21 of the power-carrying core body soft wire 20 is set to a copper wire covered by a coating 22 having insulating properties, and the core wire 31 of the reinforcing core body soft wire 30 is set to a steel wire. The rigidity of the steel wire is high, and the strength can be maintained even if the diameter is small. The reinforcing core body soft wire 30 can also be set to a structure without an insulating layer (coating). Since the power-carrying core body soft wire 20 has a coating 22, even if the steel wire without an insulating layer contacts the power-carrying core body soft wire 20, it is not easy to affect the function of the power-carrying core body soft wire 20 as an electrical signal or power supply. In this way, the reinforcing core body soft wire 30 does not need to be provided with an insulating layer, and the diameter can be reduced, so no space in the width direction is particularly required. Therefore, by setting the core wire 31 of the reinforcing core body soft wire 30 as a steel wire, the strength of the belt 1 can be maintained while ensuring a large area for the arrangement of the power-carrying core body soft wire 20. According to the above content, by setting the core wire 21 of the core soft wire 20 for power supply to a copper wire covered with an insulating coating 22, and setting the core wire 31 of the reinforcing core soft wire 30 to a steel wire, the increase in the width of the belt 1 can be further suppressed while ensuring the number of core soft wires required for wiring of electrical signals or power supplies.

[0086] The lower limit of the average diameter of the reinforcing core cord 30 is preferably 0.1 mm, more preferably 0.2 mm, and further preferably 0.5 mm. On the other hand, the upper limit of the average diameter of the reinforcing core cord 30 is preferably 2 mm, and more preferably 1 mm. If the average diameter of the reinforcing core cord 30 is less than the lower limit, the strength of the reinforcing core cord 30 may be insufficient. On the contrary, if the average diameter of the reinforcing core cord 30 exceeds the upper limit, the weight of the belt 1 may become too heavy, the bending rigidity of the belt 1 may become too high, and in particular, it may be difficult to wind around a small-diameter pulley, or the thickness of the belt body 10 used to cover the reinforcing core cord 30 may become too thick.

[0087] <Relationship between power supply core cord and reinforcement core cord>

[0088] The average diameter of the power-carrying core cord 20 may be larger than the average diameter of the reinforcing core cord 30. Thus, by making the average diameter of the power-carrying core cord 20 larger than the average diameter of the reinforcing core cord 30, the resistance per unit length of the power-carrying core cord 20 can be easily reduced. In particular, when the material of the power-carrying core cord 20 and the material of the reinforcing core cord 30 are the same, by making the average diameter of the power-carrying core cord 20 larger than the average diameter of the reinforcing core cord 30, the resistance per unit length can be reduced.

[0089] like Figure 3 As shown, four core cords 20 for conducting and six core cords 30 for reinforcing (also collectively referred to as "core cords") are arranged side by side in such a manner that the shortest distance from one surface of the belt body 10 to the outer periphery of the core cords is constant. By setting such an arrangement, the belt body 10 can be easily manufactured by extrusion molding while supporting the 10 core cords from below.

[0090] The outermost core cords in the width direction of the belt body 10 may be the reinforcing core cords 30. The outermost core cords in the width direction may have their resistance increased over time due to wear and tear caused by friction from the side surface of the belt 1. Therefore, by setting the outermost core cords in the width direction as the reinforcing core cords 30 and not using them for wiring of electric signals or power, the reliability of wiring can be improved.

[0091] The lower limit of the average distance between the central axis of the reinforcing core cord 30 disposed on the outermost side and the side of the belt body 10 adjacent thereto (also referred to as "the average distance between the reinforcing core cord 30 and the side of the belt body 10") is preferably 0.3 mm, and more preferably 0.5 mm. On the other hand, the upper limit of the average distance between the reinforcing core cord 30 and the side of the belt body 10 is preferably 1 mm, and more preferably 0.7 mm. If the average distance between the reinforcing core cord 30 and the side of the belt body 10 is less than the lower limit, the reinforcing core cord 30 disposed on the outermost side may be exposed from the side of the belt body 10 when manufacturing the belt 1. On the contrary, if the average distance between the reinforcing core cord 30 and the side of the belt body 10 exceeds the upper limit, the side edge of the belt body 10 is likely to shake during driving, and the effect of improving the accuracy of driving brought about by the reinforcing core cord 30 may be insufficient.

[0092] In the belt 1, as Figure 3 As shown, the reinforcing core cord 30 is disposed between adjacent conducting core cords 20. By disposing the reinforcing core cord 30 between adjacent conducting core cords 20, it is possible to suppress a local decrease in the strength of the belt 1.

[0093] The arrangement of the core cord 20 for power supply and the core cord 30 for reinforcement can be symmetrical with the center of the longitudinal direction of the belt body 10 as an axis. The belt 1 is used by applying tension when driving. In this way, by symmetrically arranging the core cord 20 for power supply and the core cord 30 for reinforcement, tension is uniformly applied to the width direction of the belt body 10, thereby preventing the belt 1 from being biased when moving.

[0094] As the average spacing P of adjacent core cords (refer to Figure 3 ; The lower limit of the average distance in the width direction of the belt 1 between the central axes of adjacent core cords) is preferably 0.3 mm, and more preferably 0.5 mm. On the other hand, the upper limit of the average spacing P is preferably 4 mm, and more preferably 1 mm. If the average spacing P is less than the lower limit, the insulation between the plurality of core cords 20 for power transmission may not be sufficiently ensured, or the flexibility of the belt 1 may become insufficient. On the contrary, if the average spacing P exceeds the upper limit, the belt 1 may become unnecessarily large in the width direction, or the improvement effect of the strength, durability, driving accuracy, etc. of the belt 1 brought about by the reinforcing core cord 30 may become insufficient. In addition, in the case where the core cord is not arranged at a position overlapping with the belt hole 11, the average spacing P between the two core cords arranged with the belt hole 11 sandwiched therebetween is not limited to this.

[0095] The average pitch P is preferably a constant pitch regardless of the combination of the types of adjacent core cords (the power supply core cord 20 and the reinforcement core cord 30). That is, it is preferred that the average pitch P between adjacent power supply core cords 20, between adjacent reinforcement core cords 30, and between adjacent power supply core cords 20 and reinforcement core cords 30 be equal regardless of the combination of the adjacent core cords. In this way, by arranging the core cords at equal intervals regardless of the types of the core cords, it is possible to suppress the shaking when the belt body 10 is driven. In addition, by making the average pitch P equal, the load is uniformly applied to each core cord, thereby preventing the early disconnection or the increase in the resistance of the power supply core cord 20 caused by the local application of load to a specific core cord. In addition, the so-called "equal average pitch P" includes not only the case where it is completely equal, but also the case where each average pitch P is limited to a practical error range (for example, an error range of less than 5% relative to the central value).

[0096] <Capping layer>

[0097] In the belt 1, the cover layer 40 is composed of a first cover layer 41 covering the conveying surface of the belt body 10 and a second cover layer 42 covering the driving surface. That is, in the belt 1, the cover layer 40 covers both surfaces of the belt body 10.

[0098] The friction coefficient of the cover layer 40 is preferably lower than that of the belt body 10. Thus, by providing the cover layer 40 with a low friction coefficient, the belt 1 can be made into a belt with excellent wear resistance during use. Specifically, the friction coefficient of the cover layer 40 is preferably 0.15 or more and 0.25 or less.

[0099] In the above case, the main component of the cover layer 40 is preferably a nylon resin or a fluorine resin. In this way, by setting the main component of the cover layer 40 to a nylon resin or a fluorine resin, the friction coefficient of the cover layer 40 can be reduced. Examples of the nylon resin include 6,6 nylon and 6 nylon. Examples of the fluorine resin include polytetrafluoroethylene (PTFE) and perfluoroalkoxy alkane (PFA).

[0100] In addition, the hardness of the cover layer 40 is also preferably higher than the hardness of the belt body 10. In this way, by providing a high-hardness cover layer 40, the strength of the belt 1 can be increased or the wear resistance can be improved. In addition, the JIS-A hardness of the cover layer 40 is preferably 85 or more and 95 or less from the viewpoint of effect.

[0101] In this case, the main component of the cover layer 40 may be a thermoplastic elastomer resin. By setting the main component of the cover layer 40 to be a thermoplastic elastomer resin, the belt body 10 and the cover layer 40 are not easily peeled off. Examples of the thermoplastic elastomer resin include thermoplastic polyurethane (TPU).

[0102] The first cover layer 41 and the second cover layer 42 may be made of different types. For example, the first cover layer 41 may be made of a nylon resin or a fluorine resin having a friction coefficient lower than that of the belt body 10, and the second cover layer 42 may be made of a thermoplastic elastomer resin having a hardness higher than that of the belt body 10.

[0103] The lower limit of the average thickness of the cover layer 40 is preferably 15 μm, and more preferably 25 μm. On the other hand, the upper limit of the average thickness of the cover layer 40 is preferably 3000 μm, and more preferably 2000 μm. If the average thickness of the cover layer 40 is less than the lower limit, the cover layer 40 may be easily broken. On the contrary, if the average thickness of the cover layer 40 exceeds the upper limit, the rigidity of the belt 1 may become too high. In addition, the average thickness of the first cover layer 41 and the average thickness of the second cover layer 42 may be different, but from the perspective of the warping of the belt 1, they are preferably equal.

[0104] <Method for producing the belt>

[0105] The belt 1 can be produced, for example, by a production method including an extrusion molding step and a cover lamination step.

[0106] (Extrusion molding process)

[0107] In the extrusion molding step, an extrusion molded body having a rubber or resin composition as a main component and in which the current-carrying core cord 20 and the reinforcing core cord 30 are embedded is formed by extrusion molding.

[0108] Specifically, a plurality of core cords (core cord 20 for power supply and core cord 30 for reinforcement) are inserted into the crosshead installed at the front end of the barrel of the extruder, and supported by the core support portion 20a, and extruded in a manner that the molten rubber or resin composition covers both sides. Alternatively, the molten extruded rubber or resin composition and the plurality of core cords can be clamped and pressurized by a pair of rollers to bury the plurality of core cords in the rubber or resin composition. The rubber or resin composition constitutes the belt body 10.

[0109] The heating temperature used to melt the rubber or resin composition during extrusion molding depends on the type of rubber or resin, whether a hardener is used, etc., and 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 lower than the lower limit, the rubber or resin composition cannot be fully melted, and extrusion molding may become difficult. On the contrary, if the heating temperature exceeds the upper limit, the extruded body becomes hot unnecessarily, so the cooling time becomes unnecessarily long, and the manufacturing efficiency of the belt 1 may be reduced. In addition, the maximum value of the heating temperature is set to a temperature higher than the melting point of the coating 22 so that the coating 22 is melted to the belt body 10 by the heating.

[0110] The belt body 10 can be obtained by cooling the extruded body.

[0111] <Cap layer lamination process>

[0112] In the cover layer laminating step, the cover layer 40 is laminated on both surfaces of the belt body 10 obtained by the extrusion molding step.

[0113] The lamination of the cover layer 40 can be performed as follows: when the belt body 10 is formed in the extrusion molding process, the film-shaped cover layer 40 is successively placed from the upper side or lower side, or both sides of the belt body 10, for example, inserted and sandwiched between the belt body 10 and the roller.

[0114] Next, the laminated body obtained by laminating the cover layer 40 on the belt body 10 is cooled. Examples of the cooling method include air cooling and water cooling. Although the cooling temperature and time conditions are not particularly limited, examples of the setting conditions include conditions that allow the internal temperature of the formed laminated body to be cooled to 10° C. or higher and 40° C. or lower.

[0115] The belt 1 can be manufactured in the above manner.

[0116] <Advantages>

[0117] In the belt 1, since the core cord 20 for power supply has the core cord 21 and the coating 22, when the wiring is connected to the core cord 20 for power supply, the tension applied to the core cord is transmitted to both the core cord 21 and the coating 22. Since the coating 22 is fused to the belt body 10, the tension in the same direction acts on both the belt body 10 and the core cord 20 for power supply. Therefore, the belt 1 can prevent the core cord 20 for power supply from being peeled off from the belt body 10.

[0118] [Second embodiment]

[0119] Figure 4The belt 2 shown includes a belt body 10, a plurality of teeth 50 arranged at equal intervals in the length direction on one surface of the belt body 10, four core cords 20 for power supply including a core wire 21 having conductivity, and six reinforcing core cords 30 having a higher resistance per unit length than the core cords 20 for power supply, the core cords 20 for power supply and the reinforcing core cords 30 are embedded in the belt body 10 along the length direction at intervals in the width direction of the belt body 10, the core cords 20 for power supply have a coating 22 constituting a peripheral surface in a manner covering the core wires 21, and the coating 22 is fused to the belt body 10. The belt 2 is a toothed belt.

[0120] The belt 2, except for the aspect that it includes the teeth 50 and does not include the cover layer 40, can be Figure 1 The belt 1 shown in the figure is similarly constructed, so the same reference numerals are given and detailed description is omitted. Figure 4 As shown, the belt hole 11 can be arranged between the teeth 50, but can also be arranged in a way that passes through the teeth 50. In addition, as shown in FIG. Figure 4 As shown, when there are a plurality of belt holes 11 , the intervals between the belt holes 11 may be consistent with or inconsistent with the intervals between the teeth 50 .

[0121] <Gear>

[0122] The teeth 50 are convex stripes having a trapezoidal, triangular, semicircular, mountain-shaped, corrugated, or normally distributed curve-shaped cross section. The teeth 50 are arranged so that their ridges (axial direction) coincide with the width direction of the belt body 10 .

[0123] The average height of the teeth 50 and the spacing between the teeth 50 are appropriately determined according to the use of the belt 2. The average height of the teeth 50 can be, for example, 1.0 mm or more and 10 mm or less. In addition, the spacing between the teeth 50 can be, for example, 2 mm or more and 25 mm or less.

[0124] The main component of the tooth portion 50 may be the same as that of the belt main body 10. In addition, the same additive as that of the belt main body 10 may be contained in the tooth portion 50.

[0125] <Advantages>

[0126] The belt 2 can be preferably used as a toothed belt that requires an energizing function.

[0127] [Other embodiments]

[0128] The present invention is not limited to the above-described embodiment, and can be implemented in various modified and improved forms other than the above-described embodiment.

[0129] In the above embodiment, the belt of the present invention includes four core wires for power supply and six core wires for reinforcement. However, the number of core wires for power supply and the number of core wires for reinforcement are not limited to the above, and can be composed of one or more arbitrary numbers. The number of core wires for power supply is appropriately determined according to the number of wirings of the required electrical signal or power supply, and the number of core wires for reinforcement is appropriately determined according to the required strength of the belt.

[0130] In the above-described embodiment, the belt body has one or more holes penetrating in the thickness direction. However, holes are not an essential component, and a belt without holes is also intended by the present invention.

[0131] In the above embodiment, the belt body has the core support portion on one side, but the belt body may have the core support portion on both sides, or may have no core support portion.

[0132] In the first embodiment, the cover layer covers both surfaces of the belt body, but the cover layer may cover only one of the conveying surface and the driving surface. A belt without a cover layer is also intended by the present invention.

[0133] In the second embodiment, a toothed belt without a cover layer is described, but the belt may include a cover layer covering one or both sides of the belt body. In this case, the cover layer may be configured similarly to the cover layer of the first embodiment.

[0134] In the above-described embodiment, the case where the power-carrying core cord has a connector at least on one end side has been described, but a core cord for power-carrying that does not have a connector is also intended by the present invention.

[0135] In the above-described embodiment, a structure in which a reinforcing core wire is arranged between adjacent conducting core wires is described, but the arrangement of the conducting core wires and the reinforcing core wires is not limited thereto. Figure 5 As shown in the belt 3, a core wire group 24 can be formed with core wires 20 for power supply continuously adjacent to each other. By forming the core wire group 24 in this way, it is easy to connect in parallel with wiring requiring low resistance such as power wiring. In addition, in addition to forming the core wire group 24, the belt 3 can be connected with Figure 3 The belt 1 shown has the same structure, so the corresponding structures are denoted by the same reference numerals and detailed descriptions are omitted.

[0136] The number of the power-carrying core wires 20 constituting the core wire group 24 is preferably two or more and five or less. If the number is less than the lower limit, the core wire group 24 cannot be formed. On the other hand, if the number exceeds the upper limit, the intervals between the reinforcing core wires 30 of the core wire group 24 become too large, and the strength near the core wire group 24 may be reduced.

[0137] The average spacing between the power-carrying core wires 20 constituting the core wire group 24 is preferably smaller than the average spacing between the power-carrying core wires 20 and the reinforcing core wires 30. When the power-carrying core wires 20 are used in parallel for the same signal, the average spacing between the power-carrying core wires 20 constituting the core wire group 24 can be narrowed, thereby further suppressing the increase in the width of the belt 3.

[0138] exist Figure 5 In the belt 3 shown in FIG. 1 , the core soft wire group 24 is provided at one location, but the core soft wire group 24 may also be provided at multiple locations. Figure 5 As shown, a separate power-carrying core cord 20 that does not belong to the core cord group 24 may be provided, or all the power-carrying core cords 20 may belong to any one of the core cord groups 24 .

[0139] Industrial Applicability

[0140] The tape of the present invention can suppress an increase in width while ensuring the number of core wires required for wiring of electric signals or power supply.

[0141] Explanation of symbols

[0142] 1, 2, 3: with

[0143] 10: With main body

[0144] 11: With hole

[0145] 20: Core soft wire for power supply

[0146] 20a: Core support part

[0147] 21: Core wire

[0148] 22: Coating

[0149] 23: Connector

[0150] 24: Core soft wire group

[0151] 30: Strengthen the core soft wire

[0152] 30a, 30b: Removal of part

[0153] 31: Core wire

[0154] 40: Covering layer

[0155] 41: First cover layer

[0156] 42: Second cover layer

[0157] 50: Tooth

[0158] D: Distance

[0159] P: Average spacing

Claims

1. A belt comprising: With main body; One or more core flexible cords for carrying electricity, including a conductive core wire; as well as One or more reinforcing core cords having a higher resistance per unit length than the conducting core cord, The power supply core cord and the reinforcement core cord are embedded in the belt body along the length direction at intervals in the width direction of the belt body. The power supply core cord has a coating film which covers the core cord. The coating film is fused to the belt body.

2. The belt according to claim 1, wherein the main component of the belt body is an elastomer, The main component of the coating film is polyethylene or polyester. The belt according to claim 2 , wherein the elastomer is a flame retardant raw material.

4. The belt according to claim 1, 2 or 3, comprising a cover layer having a friction coefficient lower than that of the belt main body and covering one side or both sides of the belt main body. 5 . The belt according to claim 4 , wherein a main component of the cover layer on at least one surface is a nylon-based resin or a fluorine-based resin.

6. The belt according to claim 1, 2 or 3, comprising a cover layer having a higher hardness than the belt main body and covering one side or both sides of the belt main body.

7. The belt according to claim 6, wherein a main component of the cover layer on at least one side is a thermoplastic elastomer system resin. 8 . The belt according to claim 1 , wherein the belt main body has a JIS-A hardness of 70 or more and less than 100.

9. The belt according to claim 1, 2 or 3, wherein the belt body has a core support portion on at least one side, the core support portion being a recessed portion for supporting the core cord for conducting electricity and the core cord for reinforcing. The core support portion is covered.

10. The belt according to claim 1, 2 or 3, wherein the core cords located outermost in the width direction are respectively reinforcing core cords.

11. The belt according to claim 1, 2 or 3, comprising a plurality of said core cords for conducting electricity, The reinforcing core cord is disposed between adjacent ones of the conducting core cords.

12. The belt according to claim 1, 2 or 3, comprising a plurality of said core cords for conducting electricity, A core cord group is formed in which two or more and five or less of the conducting core cords are continuously adjacent to each other.

13. The belt according to claim 1, 2 or 3, wherein the core wire of the current-carrying core wire is a soft copper wire or a copper alloy wire.

14. The belt according to claim 1, 2 or 3, wherein the core wire of the current-carrying core cord is a single wire, a collective stranded wire or a rope stranded wire.

15. The belt according to claim 1, 2 or 3, wherein the energizing core cord is a shielded wire, cable or shielded cable.

16. The belt according to claim 1, 2 or 3, wherein the belt body has one or more belt holes penetrating in the thickness direction.

17. The belt according to claim 1, 2 or 3, wherein the current supply core cord has a connector at least on one end side.

18. The belt of claim 1, 2 or 3 which is a flat belt.

19. The belt according to claim 1, 2 or 3, which is a toothed belt including a plurality of teeth arranged at equal intervals in the longitudinal direction on one surface of the belt body.

Images