Transmission belt

Abstract

The present invention provides a transmission belt capable of increasing the speed of a spindle drive device. The transmission belt (10) comprises a belt body (11), the belt body (11) having a first surface layer (18) and a second surface layer (20) and a core layer (12) arranged between the first surface layer (18) and the second surface layer (20), the core layer (12) being arranged at a position deviated toward the first surface layer (18) relative to the center of the belt body (11) in the thickness direction.

Description

Technical Field

[0001] The present invention relates to transmission belts. Background Art

[0002] The transmission belt is used in a spindle drive device of a spinning machine. For example, the spindle drive device described in Patent Document 1 includes a plurality of spindles arranged on both sides of a spinning machine frame, guide wheels for pressing the transmission belt against the spindles, and a driving pulley. The spindles are arranged on an arc protruding toward the center of the spinning machine frame. The transmission belt is wound in a manner passing through the inner side of the spindles.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 7-157928 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In spinning machines, it is desired to improve productivity. It is expected that the productivity of the spinning machine can be improved by increasing the speed of the main shaft drive device.

[0008] An object of the present invention is to provide a transmission belt capable of increasing the speed of a main shaft drive device.

[0009] Methods for solving problems

[0010] The transmission belt of the present invention includes a belt body having a first surface layer and a second surface layer, and a core layer arranged between the first surface layer and the second surface layer, wherein the core layer is arranged at a position offset toward the first surface layer side relative to the center in the thickness direction of the belt body.

[0011] Effects of the Invention

[0012] According to the present invention, the core layer of the transmission belt is arranged at a position offset toward the first surface layer, and the traveling speed is correspondingly faster. Therefore, the transmission belt can realize a high-speed spindle drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a longitudinal sectional view of the transmission belt according to this embodiment.

[0014] Figure 2 Schematic diagram showing a usage state of the power transmission belt according to the present embodiment. DETAILED DESCRIPTION

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0016] Figure 1The transmission belt 10 shown includes a belt-shaped belt body 11, which is composed of a core layer 12, a first intermediate layer 14, a second intermediate layer 16, a first surface layer 18, and a second surface layer 20. The thickness T of the belt body 11 is usually 0.5 mm to 10.0 mm. The width of the belt body 11 is usually 10 mm to 5000 mm. Figure 1 The x direction is referred to as the "length direction", the y direction is referred to as the "width direction", and the z direction is referred to as the "thickness direction". The transmission belt 10 is formed into an endless shape by joining both ends of the belt body 11 to each other. The number of layers provided on one surface of the core layer 12 is the same as the number of layers provided on the other surface.

[0017] The core layer 12 is formed of canvas using polyester fiber, nylon fiber, aramid fiber or glass fiber as the raw material of the warp and weft. A line passing through the center of the thickness of the core layer 12 and parallel to the x-axis is called a pitch line PL. The thickness of the core layer 12 is, for example, 0.3 mm to 1.0 mm. The pitch line PL refers to a reference line in the belt length direction of the transmission belt 10 that maintains the same length even if the transmission belt 10 is bent along the outer circumference of the drive pulley and does not expand or contract in the belt length direction.

[0018] The first intermediate layer 14 is provided on one surface of the core layer 12, and the second intermediate layer 16 is provided on the other surface of the core layer 12. The first intermediate layer 14 and the second intermediate layer 16 are formed of a thermoplastic resin. The thermoplastic resin is, for example, a polyurethane elastomer, a polyamide elastomer, a polyester elastomer, a polyvinyl chloride elastomer, or a polyolefin elastomer.

[0019] The thickness of the first intermediate layer 14 is, for example, 0.1 mm to 1.0 mm. The thickness of the second intermediate layer 16 is, for example, 0.3 mm to 2.0 mm. The thickness of the first intermediate layer 14 is thinner than the second intermediate layer 16. That is, the second intermediate layer 16 is thicker than the first intermediate layer 14. The ratio (T4 / T3) of the thickness T3 of the first intermediate layer 14 to the thickness T4 of the second intermediate layer 16 is, for example, 2 to 20 or 3 to 20.

[0020] The first surface layer 18 is arranged on the surface of the first intermediate layer 14 on the opposite side to the core layer 12. The second surface layer 20 is arranged on the surface of the second intermediate layer 16 on the opposite side to the core layer 12. The first surface layer 18 has a first surface 22 exposed to the outside on the side opposite to the first intermediate layer 14. The second surface layer 20 has a second surface 24 exposed to the outside on the side opposite to the second intermediate layer 16. The first surface layer 18 and the second surface layer 20 are formed by rubber, resin, canvas or synthetic leather. Rubber is, for example, mixed polyurethane, nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), ethylene propylene rubber (EPDM), ethylene propylene rubber (EPM) or chlorosulfonated polyethylene. Resin can be a polyurethane elastomer, a polyamide elastomer, a polyester elastomer, a polyvinyl chloride elastomer or a polyolefin elastomer. Canvas can be, for example, a canvas using fibers such as polyester fibers or nylon fibers. The second surface layer 20 can be selected from the above-mentioned specific examples and can be the same as the first surface layer 18 or different.

[0021] The thickness of the first surface layer 18 is 0.2 mm to 2.0 mm. The thickness of the second surface layer 20 is 0.2 mm to 2.0 mm. The thickness of the first surface layer 18 and the thickness of the second surface layer 20 may be the same or different. The hardness (JIS-A) of the first surface layer 18 and the second surface layer 20 is preferably 60 to 83° or less, more preferably 70° or less. The hardness of the first surface layer 18 and the second surface layer 20 may be obtained according to JIS K6301.

[0022] The core layer 12 is disposed at a position offset toward the first surface layer 18 relative to the center in the thickness direction of the belt body 11. When the first surface layer 18 and the second surface layer 20 have the same thickness, the core layer 12 is disposed at a position offset toward the first surface layer 18 by a length represented by (T4-T3) / 2 from the center in the thickness direction of the belt body 11. The thickness of the transmission belt 10 is asymmetric relative to the pitch line PL.

[0023] The thickness T of the belt body 11 is expressed as T=T1+T2 by the thickness T1 from the first surface 22 to the center of the core layer 12 (hereinafter referred to as the "surface side thickness") and the thickness T2 from the second surface 24 to the center of the core layer 12 (hereinafter referred to as the "pulley side thickness"). The surface side thickness T1 is thinner than the pulley side thickness T2. The surface side thickness T1 and the pulley side thickness T2 are expressed by the following formula (1).

[0024] 1<(T2 / T1)≦13…(1)

[0025] The transmission belt 10 can be manufactured by any method as long as the core layer 12 , the first intermediate layer 14 , the second intermediate layer 16 , the first surface layer 18 , and the second surface layer 20 can be fixedly bonded.

[0026] First, an adhesive is applied to both sides of the core layer 12 formed into a strip shape by coating or dipping. On both sides of the core layer 12 coated with the adhesive, the first intermediate layer 14 and the second intermediate layer 16 are laminated by extrusion lamination. Extrusion lamination uses a device (not shown) having a pair of laminating rollers whose central axes are arranged parallel to each other and a T-die for extruding molten resin between the laminating rollers. The core layer 12 is allowed to travel between the pair of laminating rollers, and the first intermediate layer 14 or the second intermediate layer 16 is attached to each side of the core layer 12. In order to make the thickness T4 of the second intermediate layer 16 thicker than the thickness T3 of the first intermediate layer 14, the speed at which the core layer 12 travels is slowed down. That is, the travel speed of the core layer 12 when the second intermediate layer 16 is formed is slower than the travel speed of the core layer 12 when the first intermediate layer 14 is formed. In this way, the thickness T4 of the second intermediate layer 16 is formed to be thicker than the thickness T3 of the first intermediate layer 14.

[0027] In addition, the thickness of the first intermediate layer 14 and the second intermediate layer 16 is not limited to the case where the thickness is changed by changing the molding speed. For example, the thickness can be changed by changing the discharge amount of the molten resin. In addition, the thickness can also be changed by overlapping a resin sheet of a predetermined thickness on the core layer and performing melt molding using a press or a vulcanizer.

[0028] Next, the first surface layer 18 and the second surface layer 20 are formed respectively. For example, when the first surface layer 18 and the second surface layer 20 are formed of rubber, a sheet of rubber material can be produced by calendaring, and the obtained sheet of rubber material is transferred and arranged on the surface on the opposite side of the core layer 12 of the first intermediate layer 14 and the second intermediate layer 16.

[0029] When transferring the first surface layer 18 and the second surface layer 20, a sheet-like rubber material is arranged on each surface of the first intermediate layer 14 and the second intermediate layer 16, and is press-vulcanized under heating and pressurizing conditions to obtain the transmission belt 10 of this embodiment, which has a core layer 12, a first intermediate layer 14 and a second intermediate layer 16 respectively arranged on both sides of the core layer 12, a first surface layer 18 arranged on the first intermediate layer 14, and a second surface layer 20 arranged on the second intermediate layer 16.

[0030] The transmission belt 10 thus obtained can be processed into a desired size according to the applied device, etc. For example, it can be processed into a width of about 20 mm to 60 mm and a length of about 10 m to 160 m. The transmission belt 10 of this embodiment can be formed into a seamless shape by joining both ends with a zigzag joint.

[0031] Next, refer to Figure 2 The use of the transmission belt 10 is described. The transmission belt 10 is installed on Figure 2On the spindle drive 25 shown. Figure 2 The x, y and z directions in Figure 1 The x direction is also the length direction of the spindle drive device 25, and the z direction is also the width direction of the spindle drive device 25. The y direction is a direction orthogonal to the x direction and the z direction.

[0032] Figure 2 The spindle drive device 25 shown is a tangential drive type, and includes a spinning machine frame 27, a driving pulley 26, a first guide wheel 28 and a plurality of second guide wheels 29 as a plurality of guide wheels, and a plurality of spindles 30. The spinning machine frame 27 has Figure 2 The installation surface 32 is parallel to the xz plane of the installation surface 32 and has the x direction as the length direction. A driving pulley 26 is provided at one end of the installation surface 32 in the length direction, that is, the left end in the figure. The driving pulley 26 is connected to the driving shaft of the motor not shown. The rotating shaft of the driving pulley 26 is rotatably supported on the installation surface 32 in the direction (y direction) perpendicular to the installation surface 32.

[0033] A first guide wheel 28 is provided at the other end in the length direction of the setting surface 32, and the first guide wheel 28 has a rotating shaft supported to be rotatable relative to the setting surface 32 in a direction (y direction) perpendicular to the setting surface 32. A plurality of second guide wheels 29 are sandwiched by an imaginary line L1 connecting the rotating shaft of the drive pulley 26 and the rotating shaft of the first guide wheel 28 and parallel to the length direction, and are arranged in a group on both sides in the width direction, with four groups arranged along the length direction. The actual spinning machine is provided with 18 groups of second guide wheels 29 and the first guide wheels 28 with 256 spindles arranged thereon. The rotating shaft of the second guide wheel 29 is rotatably supported on the setting surface 32 in a direction (y direction) perpendicular to the setting surface 32. Below, one end in the length direction of the spinning machine frame 27 ( Figure 2 The left end in the middle is called the upstream end, and the other end ( Figure 2 The right end in the figure is called the downstream.

[0034] The plurality of spindles 30 are arranged between the second guide wheels 29 adjacent to each other in the length direction. The plurality of spindles 30 are supported in a direction perpendicular to the setting surface 32 (y direction) so as to be rotatable relative to the setting surface 32. The rotation axes of the plurality of spindles 30 are arranged at approximately equal intervals on the arc connecting the second guide wheels 29 adjacent to each other in the length direction. The arc protrudes in a direction close to the imaginary line L1. Figure 2 In the embodiment, the number of the plurality of main shafts 30 arranged between a set of second guide wheels 29 is seven.

[0035] The transmission belt 10 is wound around the driving pulley 26, the first guide wheel 28, and the second guide wheel 29. The second surface 24 of the transmission belt 10 is in contact with the driving pulley 26, the first guide wheel 28, and the second guide wheel 29. The transmission belt 10 runs tangentially with respect to the plurality of spindles 30 between the second guide wheels 29. The transmission belt 10 passes through the inner side of the spinning machine frame 27 of the plurality of spindles 30, that is, through the side close to the imaginary line L1.

[0036] The transmission belt 10 is wound around a total of 42 main shafts 30 arranged on three arcs on both sides of the imaginary line L1. The first surface 22 of the transmission belt 10 is in contact with the plurality of main shafts 30.

[0037] The driving pulley 26 Figure 2 The transmission belt 10 sent out from the driving pulley 26 passes through the outer side of the spinning machine frame 27 relative to the second guide wheel 29 arranged immediately downstream, contacts the second guide wheel 29 on the second surface 24, and turns back to the inner side of the spinning machine frame 27.

[0038] The folded transmission belt 10 passes through the inner side of the spinning machine frame 27 with respect to the seven spindles 30 arranged in an arc manner on the downstream side of the second guide wheel 29, and contacts the spindles 30 on the first surface 22. The transmission belt 10 that sequentially contacts the seven spindles 30 passes through the outer side of the spinning machine frame 27 with respect to the second guide wheel 29 on the downstream side of the seven spindles 30, contacts the second guide wheel 29 on the second surface 24, and folds back toward the inner side of the spinning machine frame 27.

[0039] The transmission belt 10 repeats such an action and reaches the first guide wheel 28 arranged at the most downstream. The transmission belt 10 that has reached the first guide wheel 28 passes the outer side of the spinning machine frame 27 relative to the first guide wheel 28, contacts the first guide wheel 28 on the second surface 24, and turns back toward the upstream. The turned-back transmission belt 10 passes the outer side of the spinning machine frame 27 relative to the second guide wheel 29 arranged immediately upstream, contacts the second guide wheel 29 on the second surface 24, and turns back toward the inner side of the spinning machine frame 27.

[0040] The folded transmission belt 10 passes through the inner side of the spinning machine frame 27 with respect to the seven spindles 30 arranged in an arc manner on the upstream side of the second guide wheel 29, and contacts the spindles 30 on the first surface 22. The transmission belt 10 that contacts the seven spindles 30 in sequence passes through the outer side of the spinning machine frame 27 with respect to the second guide wheel 29 on the downstream side of the seven spindles 30, contacts the second guide wheel 29 on the second surface 24, and folds back to the inner side of the spinning machine frame 27. The transmission belt 10 repeats the above-mentioned operation and returns to the driving pulley 26.

[0041] The transmission belt 10 passes through the outside of the spinning machine frame 27 relative to the driving pulley 26, the first guide wheel 28, and the second guide wheel 29, and passes through the inside of the spinning machine frame 27 relative to the plurality of spindles 30, thereby circulating between the upstream and downstream. The travel speed V of the transmission belt 10 is represented by V (m / sec) = {(π × D × n) / (60 × 1000)}. In addition, D is the pitch diameter, and n is the rotation speed of the driving pulley. The pitch diameter D is the diameter formed by the reference line of the belt wound on the pulley.

[0042] Normally, the surface of the transmission belt that contacts the drive pulley shrinks, and the surface on the opposite side of the surface that contacts the drive pulley stretches, and there is a reference line that does not stretch at any position of the entire thickness. For example, assuming that the reference line is located at a position half of the entire thickness, if the radius of the drive pulley is r and the entire thickness of the transmission belt is T, the pitch circle diameter D is expressed by D = 2 × (r + 0.5T). That is, the travel speed V of the transmission belt is proportional to the pitch circle diameter D, and the farther the position of the reference line is from the center of the drive pulley, the faster the travel speed V.

[0043] The first surface 22 of the transmission belt 10 wound on the driving pulley 26 is stretched, and the second surface 24 is contracted, but the core layer 12 does not expand or contract. That is, the pitch line PL of the transmission belt 10 is the reference line. At this time, the pitch circle diameter D is expressed by the radius r of the driving pulley 26 and the pulley side thickness T2 as D=2×(r+T2).

[0044] Since the pulley side thickness T2 is thicker than the surface side thickness T1, it can be said that the position of the reference line of the transmission belt 10 is further away from the center of the driving pulley 26. That is, the pitch line PL of the transmission belt 10 is set at a position offset to the first surface 22 side, and the pulley side thickness T2 is larger, so the travel speed is correspondingly faster. Therefore, the transmission belt 10 can increase the speed of the main shaft drive device 25.

[0045] (Variation Example)

[0046] The present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the gist of the present invention.

[0047] For example, the above description is about the case where there are 4 sets (8 in total) of the second guide wheels 29, but the present invention is not limited thereto, and it may be 3 sets or less or 5 sets or more. The above description is about the case where 7 spindles are respectively provided between the second guide wheels 29, but the present invention is not limited thereto, and it may be 6 sets or less or 8 sets or more.

[0048] Although the first intermediate layer 14 and the second intermediate layer 16 are each formed of one layer, the present invention is not limited thereto. The first intermediate layer 14 and the second intermediate layer 16 may be formed of a plurality of layers in which two or more resins are stacked.

[0049] Explanation of symbols

[0050] 10: Transmission belt;

[0051] 11: belt body;

[0052] 12: core layer;

[0053] 14: first intermediate layer;

[0054] 16: second middle layer;

[0055] 18: first surface layer;

[0056] 20: second surface layer;

[0057] 22: first surface;

[0058] 24: second surface;

[0059] 25: spindle drive device;

[0060] 26: driving pulley;

[0061] 27: Spinning machine frame;

[0062] 28: first guide wheel;

[0063] 29: second guide wheel;

[0064] 30: spindle;

[0065] 32: Set up the surface.

Claims

1. A transmission belt, which can be applied to a spindle drive device of a tangential drive type having a driving pulley, a plurality of guide wheels, and a plurality of spindles, wherein: The transmission belt comprises a belt body, The belt body has: a core layer formed of a canvas using polyester fiber, nylon fiber, aramid fiber or glass fiber as a raw material of warp yarn and weft yarn; A first intermediate layer, disposed in contact with one surface of the core layer, and formed of a thermoplastic resin; A second intermediate layer, disposed in contact with the other surface of the core layer, and formed of a thermoplastic resin; A first surface layer, disposed in contact with the surface of the first intermediate layer on the side opposite to the core layer, and formed of rubber; The second surface layer is provided on the surface of the second intermediate layer on the opposite side to the core layer and is formed of rubber. The core layer is provided at a position offset toward the first surface layer with respect to the center in the thickness direction of the belt body. The surface of the first surface layer is capable of contacting the plurality of main axes, The surface of the second surface layer can contact the driving pulley and the plurality of guide wheels. The hardness of the first surface layer and the second surface layer is 60° or more and 83° or less, The ratio (T4 / T3) of the thickness (T3) of the first intermediate layer to the thickness (T4) of the second intermediate layer is 2 to 20, The thickness (T1) from the surface of the first surface layer to the center of the core layer and the thickness (T2) from the surface of the second surface layer to the center of the core layer satisfy the following formula (1), 1<(T2 / T1)≦13…(1).

2. The transmission belt according to claim 1, wherein: The thermoplastic resin constituting the first intermediate layer and the second intermediate layer is polyurethane elastomer, polyamide elastomer, polyester elastomer, polyvinyl chloride elastomer or polyolefin elastomer. The rubber constituting the first surface layer and the second surface layer is a kneadable polyurethane, nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), ethylene propylene diene monomer rubber (EPDM), ethylene propylene rubber (EPM) or chlorosulfonated polyethylene.

3. The transmission belt according to claim 1 or 2, wherein: The thickness of the first surface layer is the same as the thickness of the second surface layer.

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