Induction heating roller and spinning and drawing apparatus

Abstract

To effectively reduce axial variation of temperature at a cylindrical portion of a roller body in an induction heating roller.SOLUTION: An induction heating roller 20 comprises a rotatable roller unit 30 and a coil 52. The roller unit 30 comprises: a roller body 31 which includes an outer cylinder portion 34 (cylindrical portion) extending in an axial direction of the roller unit 30 and in which the outer cylinder portion 34 is induction-heated when current flows in the coil 52; a soaking member 32 which can axially move heat generated in the outer cylinder portion 34 and which axially heat more easily than the outer cylindrical portion 34; and a heat generating member 60 which is disposed at a position of an axial end of the outer cylinder portion 34 and is induction-heated when current flows in the coil 52. The heat generating member 60 is composed of a material having an electric resistivity lower than that of a material constituting the outer cylinder portion 34 and that of a material constituting the soaking member 32. The heat generating member 60 is disposed adjacently to at least one of the outer cylinder portion 34 and the soaking member 32.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an induction heating roller and a spinning and drawing apparatus equipped with an induction heating roller. [Background technology]

[0002] Patent documents 1 and 2 disclose induction heating rollers for heating objects (such as yarn and toner). The induction heating roller comprises a coil and a roller (hereinafter referred to as a roller unit) having an outer cylindrical portion (hereinafter referred to as a cylindrical portion) that is induced to heat. When an alternating current flows through the coil, a magnetic flux is generated, and eddy currents are generated in the circumferential direction of the cylindrical portion of the roller unit by electromagnetic induction, causing the cylindrical portion to heat up due to Joule heating. The object to be heated in contact with the roller unit is heated by this induction heating. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2018-35488 [Patent Document 2] Japanese Patent Application Publication No. 10-31379 [Overview of the project] [Problems that the invention aims to solve]

[0004] Generally, in induction heated rollers, due to magnetic flux leakage, the magnetic flux does not flow uniformly in the axial direction of the roller unit (hereinafter simply referred to as the axial direction), and the heat generation of the cylindrical section is not uniform in the axial direction. More specifically, the magnetic flux passing through the axial end of the cylindrical section is less than the magnetic flux passing through the axial center of the cylindrical section, so the axial end does not generate heat easily. Also, generally, the axial end of the roller unit has a larger surface area exposed to the outside air compared to the axial center. Therefore, the axial end of the cylindrical section tends to cool down due to heat dissipation. Thus, due to the difficulty in generating heat and the ease of heat dissipation, the temperature of the axial end of the cylindrical section tends to be lower than the temperature of the axial center, and the temperature of the cylindrical section tends to vary in the axial direction.

[0005] In this regard, in the induction heating roller described in Patent Document 1, a heat-synthesizing portion (described as a heat-synthesizing member in Patent Document 1) with a higher axial thermal conductivity than the cylindrical portion is in contact with the inner circumferential surface of the cylindrical portion. By making it easier to conduct the heat generated in the cylindrical portion in the axial direction with such a heat-synthesizing portion, temperature variations in the cylindrical portion in the axial direction can be reduced. However, the inventors of the present invention have found that even with such a configuration, there is actually room for further improvement.

[0006] Furthermore, in the induction heating roller described in Patent Document 2, a ring member with a lower electrical resistivity than the cylindrical portion is in contact with the axial end of the inner circumferential surface of the cylindrical portion (described as a fixing roller in Patent Document 2). When magnetic flux passes through such a ring member, eddy currents are generated in the ring member. As a result, the amount of heat generated near the axial end of the cylindrical portion increases. This helps to suppress temperature variations in the axial direction of the cylindrical portion. However, with such a configuration, there is a concern that excessive eddy currents may flow through the ring member with low electrical resistivity, causing the ring member to overheat abnormally, and that the temperature distribution of the cylindrical portion may actually worsen.

[0007] The objective of the present invention is to effectively reduce temperature variations in the cylindrical portion of the roller body in the axial direction in an induction heating roller. [Means for solving the problem]

[0008] The induction heating roller of the first invention is an induction heating roller comprising a rotatable roller unit and a coil, wherein the roller unit has a cylindrical portion extending in the axial direction of the roller unit, the cylindrical portion of which is induction heated when an electric current flows through the coil, the roller body having a cylindrical portion extending in the axial direction of the roller unit, the uniform heating portion being capable of transferring the heat generated in the cylindrical portion in the axial direction and being more capable of transferring heat in the axial direction than the cylindrical portion, and the heating portion being positioned at the end of the cylindrical portion in the axial direction and induction heated when an electric current flows through the coil, wherein the heating portion is made of a material with a lower electrical resistivity than the material constituting the cylindrical portion and the material constituting the uniform heating portion, and is positioned adjacent to at least one of the cylindrical portion and the uniform heating portion.

[0009] In this invention, the amount of heat generated near the axial end of the cylindrical portion can be increased by induction heating of the heating element with low electrical resistivity. This makes it easier to raise the temperature near the axial end of the cylindrical portion.

[0010] Furthermore, in this invention, the heat-generating section is positioned adjacent to at least one of the cylindrical section and the heat-synthesizing section. This allows the heat generated in the heat-generating section to be directly conducted to the heat-synthesizing section or transmitted to the heat-synthesizing section via the cylindrical section. As a result, the heat-synthesizing section can transmit the heat to the cylindrical section of the roller body substantially uniformly in the axial direction. This prevents the temperature from becoming abnormally high only at the axial end of the cylindrical section.

[0011] As described above, temperature variations in the cylindrical portion of the roller body in the axial direction can be effectively reduced in the induction heating roller.

[0012] The induction heating roller of the second invention is characterized in that, in the first invention, the heating portion has a ring-shaped heating member which is provided as a separate member from the roller body and the uniform heating portion and is in contact with at least one of the cylindrical portion and the uniform heating portion.

[0013] A heating element, made of a material with lower electrical resistivity than the cylindrical part, may be integrally formed with the cylindrical part or the uniform heating element, for example, by pressure welding. However, such a configuration may increase manufacturing effort and costs. In the present invention, a ring-shaped heating element, which can be manufactured easily and inexpensively, is provided as a separate component from the cylindrical part and the uniform heating element. Therefore, compared to the case where the heating element is integrally formed with the cylindrical part or the uniform heating element, the increase in manufacturing effort and costs can be suppressed.

[0014] The induction heating roller of the third invention is characterized in that, in the first or second invention, the heat equalization portion has a heat equalization member that is provided as a separate member from the roller body and is in contact with the inner circumferential surface of the cylindrical portion, and has a higher thermal conductivity in the axial direction than the cylindrical portion.

[0015] As a heat equalization section, for example, a jacket chamber containing a heat transfer medium that moves heat axially may be provided in the roller unit. However, such a configuration may complicate the structure of the roller unit. In the present invention, the heat equalization section simply has a heat equalization member with high thermal conductivity. Therefore, the structure of the roller unit can be simplified compared to a configuration in which, for example, a jacket chamber is provided.

[0016] The induction heating roller of the fourth invention is characterized in that, in any of the first to third inventions, the heat equalization section is arranged inside the cylindrical section in the radial direction of the roller unit, and the heat generating section is arranged side by side with the heat equalization section in the axial direction.

[0017] In a configuration where the soaking section is arranged on the radially inner side of the cylindrical section, when the heat generating section is arranged, for example, on the radially inner side of the soaking section, the heat generating section moves farther away from the cylindrical section in the radial direction. In this case, there is a possibility that the amount of heat that escapes without being transmitted to the cylindrical section among the heat generated in the heat generating section increases, and the heating efficiency of the cylindrical section may deteriorate. In the present invention, the heat generating section is arranged side by side with the soaking section in the axial direction. In other words, in the radial direction, the heat generating section is arranged close to the cylindrical section. Therefore, deterioration of the heating efficiency of the cylindrical section can be suppressed.

[0018] The induction heating roller of the fifth invention is characterized in that, in any one of the first to fourth inventions, the heat generating section is arranged adjacent to the soaking section.

[0019] In the present invention, the heat generated in the heat generating section can be directly conducted to the soaking section. Therefore, the soaking section can effectively equalize the temperature of the cylindrical section in the axial direction.

[0020] The induction heating roller of the sixth invention is characterized in that, in the fifth invention, the heat generating section is arranged at a distance from the cylindrical section.

[0021] In the present invention, the heat generated in the heat generating section is not directly conducted to the cylindrical section, but is indirectly conducted to the cylindrical section via the soaking section. Therefore, compared with the case where the heat generated in the heat generating section is directly conducted to the cylindrical section, it is possible to more reliably suppress the abnormal increase in the temperature only at the axial end portion of the cylindrical section.

[0022] The induction heating roller of the seventh invention is characterized in that, in any one of the first to fifth inventions, the heat generating section is arranged adjacent to the cylindrical section.

[0023] In the present invention, the heat generated in the heat generating section can be directly conducted to the cylindrical section. Therefore, since the cylindrical section can be efficiently heated, such a configuration is effective when the amount of heat generated in the heat generating section is small.

[0024] The induction heating roller of the eighth invention is characterized in that, in any of the first to seventh inventions, the roller body has a disc portion extending inward in the radial direction of the roller unit from one end of the cylindrical portion in the axial direction, the heat equalization portion has a heat equalization member that is provided as a separate member from the roller body and in contact with the inner circumferential surface of the cylindrical portion and has a higher thermal conductivity in the axial direction than the cylindrical portion, the heating portion has a ring-shaped heating member that is provided as a separate member from the roller body and the heat equalization member and is arranged in the axial direction alongside the heat equalization member, and a pressing portion is provided which is arranged on the other side in the axial direction from the heat equalization member and the heating member and presses the heat equalization member and the heating member toward the one side.

[0025] In this invention, in a configuration where the roller body, the heat equalization member, and the heat generating member are provided as separate components, both the heat equalization member and the heat generating member can be pressed axially toward one side (the disc side) by a single pressing portion. This allows the heat equalization member and the heat generating member to be sandwiched between the pressing portion and the disc portion and fixed to the roller body in the axial direction. Therefore, the heat generating member can be fixed to the roller body with a simpler configuration compared to the case where the heat generating member is positioned radially different from the heat equalization member.

[0026] The induction heating roller of the ninth invention is characterized in that, in any of the first to eighth inventions, the roller body is cantilevered, and the heating element is positioned at the tip end of the cylindrical portion in the axial direction.

[0027] In induction heating rollers where the roller body is cantilevered, the axial end surface of the roller body is usually exposed to the outside air. As a result, a large amount of heat is dissipated from the axial end of the roller body, and there is a problem that the temperature of the axial end of the cylindrical part tends to drop particularly easily. In this regard, in the present invention, the vicinity of the axial end of the cylindrical part is heated by the heating element, so the temperature drop of the axial end of the cylindrical part can be effectively suppressed. Therefore, temperature variations in the cylindrical part can be effectively reduced.

[0028] The induction heating roller of the tenth invention is characterized in that, in any of the first to ninth inventions, the heating element is made of a non-magnetic material.

[0029] When the heating element is made of a magnetic material such as carbon steel, the way the magnetic flux flows may differ from when the heating element is made of a non-magnetic material. Therefore, depending on the arrangement of the heating element, for example, the magnetic flux may not pass through the cylindrical part easily, which may hinder the heating of the cylindrical part itself. In this invention, since the heating element is made of a non-magnetic material, it is possible to avoid a situation where the way the magnetic flux flows differs from the intended way.

[0030] The induction heating roller of the eleventh invention is characterized in that, in any of the first to tenth inventions, the density of the heating portion is at least lower than the density of the cylindrical portion.

[0031] In this invention, the increase in weight of the induction heating roller due to the provision of a heating element can be suppressed.

[0032] The induction heating roller of the 12th invention is characterized in that, in any of the first to 11th inventions, the thermal conductivity of the material constituting the heat uniforming portion is higher than the thermal conductivity of the material constituting the cylindrical portion in the axial direction, and the electrical resistivity of the material constituting the heat uniforming portion is higher than the electrical resistivity of the material constituting the cylindrical portion in the circumferential direction of the roller unit.

[0033] Induction heating rollers are heated primarily by Joule heating due to eddy currents flowing circumferentially around the roller unit. If eddy currents flow more easily in the uniform heating section than in the cylindrical section in the circumferential direction, the following problems may arise. First, if the uniform heating section, which is located at least some distance from the cylindrical section that is to be heated, generates heat, the heat can diffuse not only to the cylindrical section but also to other components and / or space. This diffused heat is not necessarily transferred uniformly to the cylindrical section. Also, since the uniform heating section is generally shorter than the cylindrical section in the axial direction, when the uniform heating section generates heat, the heat distribution in the axial direction becomes uneven for the cylindrical section. Due to these factors, there is a risk that the temperature variation of the cylindrical section in the axial direction will increase. In the present invention, the uniform heating section can facilitate the transfer of heat in the axial direction, and the flow of eddy currents in the uniform heating section in the circumferential direction can be suppressed, thereby suppressing unnecessary heat generation in the uniform heating section itself. Therefore, it is possible to suppress the increase in temperature variation of the cylindrical section caused by heat generation in the uniform heating section.

[0034] The spinning and drawing apparatus of the 13th invention is a spinning and drawing apparatus equipped with an induction heating roller according to any of the first to 12th inventions, characterized in that a plurality of threads are wound around the cylindrical portion in the axial direction as objects to be heated.

[0035] In this invention, yarn is wound around a cylindrical section in which axial temperature variation is reduced. Therefore, it is possible to reduce quality variations among multiple yarns heated by an induction heating roller. [Brief explanation of the drawing]

[0036] [Figure 1] This is a schematic diagram showing a spinning take-up machine equipped with an induction heating roller according to this embodiment. [Figure 2] This is a cross-sectional view of an induction heating roller. [Figure 3] This table shows the physical properties of the roller body, the heat distribution component, and the heat generation component. [Figure 4] This graph shows the temperature distribution on the outer surface in the axial direction. [Figure 5](a) and (b) are tables showing the physical properties of the roller body, heat distribution member, and heat generation member related to the modified version. [Figure 6] (a) to (f) are explanatory diagrams showing the arrangement of the heating element in several other modified examples. [Figure 7] This figure shows an induction heating roller relating to yet another modified example. [Modes for carrying out the invention]

[0037] Next, embodiments of the present invention will be described. Note that the vertical direction on the paper in Figure 1 is defined as the vertical direction (the vertical direction in which gravity acts). The horizontal direction on the paper in Figure 1 is defined as the horizontal direction. The vertical direction on the paper in Figure 1 is defined as the front-back direction.

[0038] (Spinning machine) The configuration of the spinning take-up machine 1 equipped with the induction heating roller 20 according to this embodiment will be described with reference to Figure 1. Figure 1 is a schematic diagram of the spinning take-up machine 1 viewed from the front. The spinning take-up machine 1 is configured to stretch a plurality of yarns Y (the objects to be heated in this invention) spun from the spinning device 2 using the spinning stretching device 3, and then wind them up using the yarn winding device 4.

[0039] The spinning apparatus 2 generates multiple yarns Y by continuously spinning a molten polymer such as polyester. The multiple yarns Y spun from the spinning apparatus 2 are coated with oil by the oil guide 10. The yarns Y are then sent to the spinning and drawing apparatus 3 via the guide roller 11.

[0040] The spinning and drawing device 3 is a device for drawing multiple yarns Y. The spinning and drawing device 3 is located below the spinning device 2. The spinning and drawing device 3 has multiple godet rollers 21 to 25 housed inside the insulated box 12. The godet rollers 21 to 25 are rotationally driven by motors (not shown) provided in relation to each of them. Each of the godet rollers 21 to 25 is an induction heating roller 20 that is induction heated by a coil (details will be described later). Multiple yarns Y are wound around the outer circumferential surfaces of the godet rollers 21 to 25. An inlet 12a for introducing multiple yarns Y into the insulated box 12 is formed at the lower part of the right side of the insulated box 12. An outlet 12b for leading multiple yarns Y out of the insulated box 12 is formed at the upper part of the right side of the insulated box 12. Multiple threads Y are wound onto each godet roller 21-25 in order, starting from the lower godet roller 21, at a winding angle of less than 360 degrees.

[0041] The three lower godet rollers 21-23 are preheating rollers for preheating multiple yarns Y before stretching. The surface temperature of godet rollers 21-23 is set to a temperature above the glass transition point of yarn Y (e.g., 90-100°C). The two upper godet rollers 24 and 25 are tempering rollers for heat setting the stretched multiple yarns Y. The surface temperature of godet rollers 24 and 25 is set to a higher temperature than the surface temperature of godet rollers 21-23 (e.g., 150-200°C). In addition, the yarn feed speed of godet rollers 24 and 25 is set to be faster than the yarn feed speed of godet rollers 21-23.

[0042] Multiple yarns Y introduced into the insulated box 12 via the inlet 12a are preheated to a temperature suitable for stretching while being fed by the godet rollers 21-23. The preheated yarns Y are stretched by the difference in yarn feeding speed between the godet roller 23 and the godet roller 24. The yarns Y are further heated to a higher temperature while being fed by the godet rollers 24 and 25. As a result, the yarns Y are heat-set in a stretched state. The stretched yarns Y are then discharged out of the insulated box 12 via the outlet 12b.

[0043] Multiple yarns Y, stretched by the spinning and drawing device 3, are sent to the yarn winding device 4 via the guide roller 13. The yarn winding device 4 is a device that winds up the multiple yarns Y. The yarn winding device 4 is located below the spinning and drawing device 3. The yarn winding device 4 includes a bobbin holder 14 and contact rollers 15, etc. The bobbin holder 14 has a cylindrical shape that extends in the front-to-back direction. The bobbin holder 14 is rotationally driven by a motor (not shown). Multiple bobbins B are mounted side by side on the bobbin holder 14 in the front-to-back direction. The yarn winding device 4 rotates the bobbin holder 14 to simultaneously wind multiple yarns Y onto multiple bobbins B, producing multiple packages P. The contact rollers 15 contact the surfaces of the multiple packages P, applying a predetermined contact pressure to shape the packages P.

[0044] (Configuration of induction heating roller) Next, the configuration of the induction heating roller 20 applied to the Godet rollers 21-25 will be explained with reference to the cross-sectional view in Figure 2 and the table in Figure 3. Figure 2 is a cross-sectional view of the induction heating roller 20 passing through its axial center. As shown in Figure 2, the roller unit 30 (described later) of the induction heating roller 20 is cantilevered by the motor 100 that rotates the roller unit 30. Hereinafter, the direction in which the roller unit 30 extends (left-right direction in the plane of Figure 2) will be referred to as the axial direction of the roller unit 30. The axial direction of the roller unit 30 will also be simply referred to as the axial direction. In the axial direction, the motor 100 side (right side in the plane of Figure 2) will be referred to as the base end side (the other side of the present invention). In the axial direction, the side opposite to the motor 100 (left side in the plane of Figure 2) will be referred to as the tip side (the one side of the present invention). The radial direction of the roller unit 30 (up-down direction in the plane of Figure 2) will also be simply referred to as the radial direction. The circumferential direction of the roller unit 30 (the direction perpendicular to both the axial and radial directions) is also simply called the circumferential direction.

[0045] As shown in Figure 2, the induction heating roller 20 has a rotatable roller unit 30 and a non-rotating fixed part 50. The induction heating roller 20 is configured to raise the temperature of the outer circumferential surface of the roller unit 30 (the outer circumferential surface 31a of the roller body 31, described later) by induction heating using a coil 52 provided on the fixed part 50, described later. As a result, the induction heating roller 20 heats a plurality of threads Y wound around the outer circumferential surface 31a. The roller unit 30 is rotationally driven by a motor 100. The fixed part 50 is fixed, for example, to a support part (not shown) attached to the motor 100.

[0046] The roller unit 30 comprises a roller body 31 and a heat equalization member 32 (heat equalization part of the present invention). The roller body 31 is generally cylindrical. The roller body 31 is rotationally driven by a motor 100. The heat equalization member 32 is configured to equalize the temperature of the roller body 31 in the axial direction. The roller body 31 and the heat equalization member 32 are fixed to each other via a fixing ring 33 or the like provided at the axial base end of the roller unit 30.

[0047] The roller body 31 is made of, for example, carbon steel, which is both a magnetic material (ferromagnetic material) and a conductor. The relative permeability of carbon steel is 100 to 2000 (see Figure 3). The roller body 31 has an outer cylinder portion 34 (the cylindrical portion of the present invention), an axial core portion 35, and a disc portion 36. The outer cylinder portion 34 is the substantially cylindrical part of the roller body 31 that is located on the outermost side in the radial direction. The outer cylinder portion 34 is arranged to extend along the axial direction. The axial, radial, and circumferential directions of the outer cylinder portion 34 substantially coincide with the axial, radial, and circumferential directions of the roller unit 30, respectively. The axial core portion 35 is the substantially cylindrical part located radially inside the coil 52. The disc portion 36 is the substantially disc-shaped part that connects the tip of the outer cylinder portion 34 and the tip of the axial core portion 35. In other words, the disc portion 36 is the part that extends radially inward from the axial tip of the outer cylinder portion 34. The axial base end of the roller body 31 is open.

[0048] In this embodiment, the outer cylinder portion 34, the axial core portion 35, and the disc portion 36 are integrally formed as a single member. However, this is not limited to this. For example, the outer cylinder portion 34 may consist of one first member, and the axial core portion 35 and the disc portion 36 may consist of one second member (not shown). In this case, the first member and the second member are fixed to each other, for example, by welding or by a fixing method using fixing members such as screws.

[0049] A coating layer (not shown) with a thickness of approximately 0.05 mm is formed on the radially outer side of the outer circumferential surface 34a of the outer cylinder portion 34. The surface of this coating layer is the outer circumferential surface 31a (roller surface) of the roller body 31. Multiple threads Y are wound around the outer circumferential surface 31a in an axial direction as the object to be heated (in other words, multiple threads Y are wound around the outer cylinder portion 34). Note that the coating layer is not necessarily required (in this case, the outer circumferential surface 34a of the outer cylinder portion 34 is the outer circumferential surface of the roller body 31). The axial length of the outer circumferential surface 31a is, for example, 150 mm. A heat-distributing member 32 is in contact with the inner circumferential surface 34b of the outer cylinder portion 34. A shaft mounting hole 35a is formed in the axial center portion 35 through which the drive shaft 101 of the motor 100 is inserted. The drive shaft 101 is fitted into the shaft mounting hole 35a. As a result, the roller body 31 is fixed to the drive shaft 101 and can rotate integrally with the drive shaft 101. The roller body 31 is cantilevered by the drive shaft 101. The heating element 60 (described later) is in contact with the axial base end surface (base end surface 36a) of the disc portion 36. In addition, a roughly disc-shaped insulating material (not shown) is attached to the axial tip end surface (tip surface 36b) of the disc portion 36. The insulating material is exposed to the outside air (air inside the insulated box 12).

[0050] The heat equalization member 32 is a member that equalizes the distribution of the surface temperature of the roller body 31 (i.e., the temperature of the outer peripheral surface 31a) in the axial direction by transferring heat in the axial direction. The axial, radial, and circumferential directions of the heat equalization member 32 substantially coincide with the axial, radial, and circumferential directions of the roller unit 30, respectively. The heat equalization member 32 is positioned radially inward of the outer cylinder portion 34. The heat equalization member 32 is also positioned radially outward of the coil 52. The heat equalization member 32 is pressed toward the axial end by the pressing portion 42 (details will be described later). In this way, the heat equalization member 32 and the heat generating member 60, which will be described later, are fixed to the roller body 31.

[0051] The heat-distributing member 32 is a cylindrical member that extends in the axial direction. The heat-distributing member 32 is made of, for example, a C / C composite (carbon fiber reinforced carbon composite material), which is a composite material of carbon fibers and graphite. The C / C composite is a non-magnetic material. In this embodiment, the carbon fibers of the C / C composite are oriented in the axial direction. In other words, in this embodiment, the material constituting the heat-distributing member 32 is anisotropic with respect to thermal conductivity and electrical resistivity, as will be described later. The axial thermal conductivity of the C / C composite is higher than the thermal conductivity of the material constituting the roller body 31 (at least higher than the thermal conductivity of the inner circumferential surface 34b of the outer cylinder portion 34). In other words, the heat-distributing member 32 transfers heat more easily in the axial direction than the outer cylinder portion 34. For example, the thermal conductivity of the carbon steel constituting the roller body 31 is 51.5 W / (m·K) (see Figure 3). On the other hand, the axial thermal conductivity of the C / C composite constituting the heat-uniforming member 32 is 404 W / (m·K) (see Figure 3). The axial thermal conductivity of the material constituting the heat-uniforming member 32 is higher than the circumferential thermal conductivity of the material constituting the heat-uniforming member 32 (15.2 W / (m·K); see Figure 3). The heat-uniforming member 32 equalizes the temperature of the outer surface 31a of the roller body 31 by transferring heat axially through thermal conduction. Note that the carbon fibers of the C / C composite do not necessarily have to be oriented axially. For example, the heat-uniforming member 32 may be formed from a C / C composite in which the carbon fibers are randomly oriented.

[0052] The heat equalization member 32 is divided into a plurality of heat equalization pieces 41 in the circumferential direction. The radially outer surface (outer surface 41a) of each heat equalization piece 41 is in contact with the inner circumferential surface 34b of the outer cylinder portion 34. When the axial region of the outer circumferential surface 31a of the roller body 31 around which the plurality of threads Y are wound is defined as the winding region R, each heat equalization piece 41 is provided over approximately the same range as the winding region R in the axial direction. The radially inner surface (inner surface 41b) of each heat equalization piece 41 faces the coil 52 in the radial direction. The axial base end surface (base end surface 41c) of each heat equalization piece 41 is a tapered surface. In detail, the base end surface 41c protrudes more towards the axial base end as it extends radially outward. In the axial direction, a gap is formed between the axial tip end surface (tip surface 41d) of each heat equalization piece 41 and the base end surface 36a of the disc portion 36. A heat-generating element 60, which will be described later, is placed in the gap.

[0053] Each heat-distributing piece 41 is pressed axially towards the tip and radially outward by a pressing section 42. The pressing section 42 has a pressing member 43 and a plurality of springs 44. The pressing member 43 is, for example, a substantially ring-shaped member made of carbon steel, the same as the roller body 31. The outer circumferential surface of the pressing member 43 is positioned radially at approximately the same location as, for example, the outer surface 41a of the heat-distributing piece 41. The inner circumferential surface of the pressing member 43 is positioned radially inward than, for example, the inner surface 41b of the heat-distributing piece 41. The axial tip side surface (tip surface 43a) of the pressing member 43 is a tapered pressing surface. In detail, the tip surface 43a protrudes axially towards the tip as it moves radially inward. As a result, the tip surface 43a and the base end surface 41c of the heat-distributing piece 41 are in firm contact with each other.

[0054] The spring 44 is positioned axially between the pressing member 43 and the fixing ring 33. The base end of the spring 44 is in contact with the fixing ring 33. The tip end of the spring 44 is in contact with the pressing member 43. The spring 44 is compressed axially by the fixing ring 33 and the pressing member 43. As a result, the spring 44 biases the pressing member 43 axially toward the tip by its elastic restoring force. As the pressing member 43 is biased by the spring 44, the heat equalization member 32 is pressed axially toward the tip. At this time, each heat equalization piece 41 of the heat equalization member 32 is also pressed radially outward by the tapered tip surface 43a of the pressing member 43. As a result, each heat equalization piece 41 is firmly pressed against the outer cylinder portion 34. Therefore, even if there is a difference between the amount of thermal expansion of the outer cylinder portion 34 and the amount of thermal expansion of the heat-distributing member 32, it is possible to prevent a gap from forming between the outer cylinder portion 34 and the heat-distributing member 32. The number of springs 44 can be any number. In addition, instead of the springs 44, an elastic member made of rubber, for example, may be used as a biasing member to bias the pressing member 43.

[0055] The fixing ring 33 is, for example, a substantially ring-shaped member made of carbon steel, the same as the roller body 31. The fixing ring 33 is fixed to the axial base end of the outer cylindrical portion 34 of the roller body 31 by, for example, a screw (not shown). The fixing ring 33 is provided to compress the spring 44, which is positioned between the fixing ring 33 and the pressing member 43 in the axial direction, in the axial direction. As a result, as described above, the roller body 31 and the heat equalization member 32 are fixed to each other via the fixing ring 33, etc.

[0056] Next, the fixing part 50 will be described. As shown in Figure 2, the fixing part 50 has a bobbin member 51, a coil 52, and a flange 53. In the fixing part 50, the coil 52 is wound around the axially extending bobbin member 51 along the axial direction. The axial base end of the bobbin member 51 is attached to the flange 53.

[0057] The bobbin member 51 is, for example, a substantially cylindrical member made of carbon steel, similar to the roller body 31. The bobbin member 51 extends along the axial direction of the roller unit 30. The circumferential direction of the bobbin member 51 substantially coincides with the circumferential direction of the roller unit 30. The bobbin member 51 is positioned radially inward from the outer cylindrical portion 34 of the roller body 31. Furthermore, the bobbin member 51 is positioned radially outward from the axial center portion 35 of the roller body 31. A coil 52 is wound around the outer circumference of the bobbin member 51 along the axial direction.

[0058] The coil 52 is for inductively heating at least the outer cylinder portion 34 and the heating element 60 (heating element of the present invention), which will be described later. The coil 52 is wound around the outer circumference of the bobbin member 51. The coil 52 wound around the outer circumference of the bobbin member 51 extends along the direction of extension of the bobbin member 51 (see Figure 2). In other words, the longitudinal direction in which the coil 52 extends substantially coincides with the axial direction of the roller unit 30. The coil 52 is positioned radially inward from the outer cylinder portion 34 of the roller body 31. Also, the coil 52 is positioned radially outward from the axial center portion 35 of the roller body 31. For example, when an AC voltage is applied to the coil 52 by an AC power supply (not shown), an AC current flows through the coil 52 and an AC magnetic field is generated. The AC power supply is, for example, a general commercial power supply (power frequency is 50Hz or 60Hz), but is not limited to this.

[0059] The flange 53 is, for example, a substantially disc-shaped member made of carbon steel, similar to the roller body 31. The flange 53 is positioned at the axial base end of the fixing part 50. A through hole 53a is formed in the radial center of the flange 53 so that the flange 53 and the drive shaft 101 of the motor 100 do not interfere with each other. The axial base end of the bobbin member 51 is attached to the flange 53. The flange 53 is fixed to a support part (not shown) provided on the motor 100. The flange 53 is, for example, positioned axially alongside the fixing ring 33. The flange 53 and the fixing ring 33 are positioned spaced apart from each other.

[0060] In the induction heating roller 20 having the above configuration, when an AC voltage is applied to the coil 52, an AC current flows through the coil 52 and an AC magnetic field is generated. As a result, the magnetic flux passes through the outer cylinder portion 34 of the roller body 31 in the axial direction (see the dashed arrow A in Figure 2). At this time, eddy currents flow in the circumferential direction in the roller body 31, and the outer cylinder portion 34 is heated by Joule heating.

[0061] In general, in induction heating rollers 20, due to magnetic flux leakage, the magnetic flux does not flow uniformly in the axial direction, and the heat generated in the outer cylinder portion 34 is not uniform in the axial direction. More specifically, the magnetic flux passing through the axial ends of the outer cylinder portion 34 is less than the magnetic flux passing through the axial center, so the axial ends (both ends) do not generate heat easily. Furthermore, at the axial tip of the roller unit 30, heat is easily released to the outside via the disc portion 36 (although the aforementioned heat-insulating material helps to suppress heat dissipation, it is difficult to completely prevent heat dissipation). Therefore, the axial tip of the outer cylinder portion 34 tends to cool down due to heat dissipation. Thus, due to the difficulty in generating heat and the ease of heat dissipation, the temperature of the axial tip of the outer peripheral surface 31a tends to be lower than the temperature of the axial center, and the temperature of the outer peripheral surface 31a tends to vary in the axial direction.

[0062] In this embodiment, the heat generated in the outer cylinder portion 34 is made more easily conducted (moved) in the axial direction by the heat equalization member 32, thereby reducing the temperature variation in the axial direction of the outer peripheral surface 31a compared to the case where the heat equalization member 32 is not provided. However, the inventors of this application have found that even with such a configuration, there is room for further improvement. Therefore, in order to effectively reduce the temperature variation of the outer peripheral surface 31a (roller surface) in the axial direction, the roller unit 30 of this embodiment has the following configuration.

[0063] (Detailed configuration of the roller unit) The detailed configuration of the roller unit 30 will now be described with reference to Figures 2 and 3. As shown in Figure 2, the roller unit 30 further includes a heating element 60 positioned on the axial end side of the heat-distributing member 32. The heating element 60 is configured to heat the end of the outer cylinder portion 34 and its vicinity by induction heating. In this embodiment, the heating element 60 is provided as a separate component from the roller body 31 and the heat-distributing member 32.

[0064] The heating element 60 is a ring-shaped conductive element. "Ring-shaped" means that it is formed over the entire circumference of the heating element 60. For example, the heating element 60 may be annular or polygonal. Alternatively, the heating element 60 may be divided into a plurality of conductive ring pieces (not shown) in the circumference, and configured so that two adjacent ring pieces in the circumference are in contact with each other. The circumference of the heating element 60 substantially coincides with the circumference of the outer cylinder portion 34. The cross-section of the heating element 60 (see Figure 2) is, for example, substantially rectangular. That is, the heating element 60 has, for example, an outer peripheral surface 60a arranged radially outward, an inner peripheral surface 60b arranged radially inward, a base end surface 60c arranged axially towards the base end, and a tip surface 60d arranged axially towards the tip end.

[0065] The material constituting the heat-generating element 60 is preferably aluminum. That is, at least in the circumferential direction, the electrical resistivity of the material constituting the heat-generating element 60 is lower than the electrical resistivity of the material constituting the roller body 31 and the electrical resistivity of the material constituting the heat-soothing element 32. Specifically, the electrical resistivity of aluminum, which is the material constituting the heat-generating element 60, is 3.0 μΩ·cm (see Figure 3). The electrical resistivity of carbon steel, which is the material constituting the roller body 31, is 11.8 μΩ·cm (see Figure 3). The circumferential electrical resistivity of the C / C composite, which is the material constituting the heat-soothing element 32, is higher than the electrical resistivity of the material constituting the roller body 31 (outer cylinder portion 34), at 1.3 × 10⁻⁶. 6 The value is μΩ·cm (see Figure 3). The circumferential electrical resistivity of the material constituting the heat-distributing member 32 is equal to the axial electrical resistivity of the material constituting the heat-distributing member 32 (3.9 × 10⁻¹⁰).4 It is higher than μΩ·cm (see Figure 3). Furthermore, it is preferable that the heating element 60 is made of a non-magnetic material (a material that is not ferromagnetic) so as not to obstruct the magnetic flux passing through the roller body 31. Since aluminum is a non-magnetic material (the relative permeability of aluminum is 1.0), the above condition is met. In addition, in order to avoid increasing the weight of the roller unit 30 as much as possible, it is preferable that the density of the material constituting the heating element 60 be low. In this regard, the density of aluminum is 2.7 g / cm³. 3 (See Figure 3). Furthermore, the density of carbon steel is 7.8 g / cm³. 3 (See Figure 3). Furthermore, the density of the C / C composite is 1.7 g / cm³. 3 (See Figure 3). Therefore, in this embodiment, the density of the heat-generating element 60 (the density of the material constituting the heat-generating element 60) is at least lower than the density of the roller body 31 (the density of the material constituting the roller body 31).

[0066] In this embodiment, when the heating element 60 is made of aluminum, a suitable thickness of the heating element 60 in the axial direction is, for example, 2 mm. However, the thickness is not limited to that described above.

[0067] The arrangement of the heat-generating member 60 will now be described. The heat-generating member 60 is positioned at the tip end of the outer cylinder portion 34 in the axial direction. In this embodiment, "the position at the tip end of the outer cylinder portion 34" refers to the position between the base end surface 36a of the disc portion 36 and the tip of the heat-distributing member 32 (the tip surface 41d of the heat-distributing piece 41) in the axial direction. The heat-generating member 60 is positioned radially inward of the outer cylinder portion 34 and on the axial base end side of the disc portion 36. Furthermore, the heat-generating member 60 is positioned on the axial tip side of the heat-distributing member 32. The heat-generating member 60 is positioned adjacent to the heat-distributing member 32 in the axial direction. The base end surface 60c of the heat-generating member 60 is in contact with the tip surface 41d of the heat-distributing member 32. As a result, the heat-generating member 60 can conduct heat with the heat-distributing member 32 without the need for other members such as the roller body 31. In other words, the heat-generating member 60 can conduct heat directly with the heat-distributing member 32.

[0068] The tip surface 60d of the heating element 60 is in contact with the base end surface 36a of the disc portion 36. On the other hand, the heating element 60 is positioned at a distance from the outer cylinder portion 34 in the radial direction. That is, the outer peripheral surface 60a of the heating element 60 is separated from the inner peripheral surface 34b of the outer cylinder portion 34. The inner peripheral surface 60b of the heating element 60 is positioned to be approximately flush with the inner surface 41b of each heat distribution piece 41, but is not limited to this. In this embodiment, the heating element 60 is positioned so that at least a portion of it overlaps with the winding region R in the axial direction, but is not limited to this.

[0069] The heating element 60 is pressed toward the axial end together with the heat equalization member 32 by the pressing member 43 and spring 44 described above. As a result, the heating element 60 is sandwiched and fixed in the axial direction between the heat equalization member 32 and the disc portion 36 of the roller body 31.

[0070] (Mechanism for reducing temperature variation) In the induction heating roller 20 having the above configuration, the temperature of the outer surface 31a is made uniform as follows. That is, of the magnetic flux generated by the current flowing through the coil 52, most of the magnetic flux passes through the roller body 31 (see arrow A in Figure 2). On the other hand, some of the magnetic flux leaks from the roller body 31 and passes through the heating element 60. Of the above-mentioned portion of magnetic flux, the component that passes through the heating element 60 in the axial direction induces an electromotive force inside the heating element 60 in the circumferential direction of the heating element 60. This induced electromotive force causes eddy currents to flow in the circumferential direction of the heating element 60, and the heating element 60 generates heat by Joule heating. As described above, the electrical resistivity of the material constituting the heating element 60 is lower than that of the material constituting the roller body 31. For this reason, large eddy currents tend to flow inside the heating element 60, so the heating element 60 generates a lot of heat. In this way, the induction heating of the heating element 60 increases the amount of heat generated near the axial end of the outer cylinder portion 34. As a result, the temperature near the axial end of the outer cylinder portion 34 tends to rise.

[0071] Furthermore, in this embodiment, the heat generated in the heat-generating member 60 is directly conducted to the heat-soothing member 32, which is in contact with the heat-generating member 60. As a result, the heat-soothing member 32 can transmit the heat generated in the heat-generating member 60 to the outer cylinder portion 34 in a substantially uniform manner in the axial direction, and consequently transmit the heat to the outer circumferential surface 31a of the roller body 31 in a substantially uniform manner. This suppresses the abnormally high temperature of only the axial end of the outer circumferential surface 31a. In addition, the heat generated in the heat-generating member 60 is not directly conducted to the outer cylinder portion 34, but is indirectly conducted to the outer cylinder portion 34 via the heat-soothing member 32. Therefore, compared to the case where the heat generated in the heat-generating member 60 is directly conducted to the outer cylinder portion 34, the abnormally high temperature of only the axial end of the outer circumferential surface 31a is suppressed more effectively. Through the above mechanism, temperature variation of the outer circumferential surface 31a in the axial direction is reduced.

[0072] (Results of confirmation of the effect of reducing temperature variation) Next, the results of confirming the effect of the heat-generating element 60 on reducing temperature variation will be explained in detail with reference to the graph in Figure 4. The inventors of this application measured and compared the temperature distribution in the axial direction of the outer peripheral surface 31a of the roller body 31 in cases where the heat-generating element 60 is provided on the roller unit 30 (example) and in cases where it is not provided (comparative example). As a common condition, the set temperature of the outer peripheral surface 31a was set to 200°C.

[0073] The comparison results are shown in Figure 4. The horizontal axis of the graph represents the distance of the outer circumferential surface 31a from the tip of the roller body 31. In other words, the smaller the distance, the closer it is to the axial tip of the roller body 31, and the larger the distance, the closer it is to the axial base of the roller body 31. As mentioned above, the axial length of the outer circumferential surface 31a is 150 mm. The winding region R around which the yarn Y is wound is, for example, the region 16 to 140 mm from the axial tip to the axial base of the roller body 31. The vertical axis of the graph shows the difference between the temperature of the outer circumferential surface 31a and the set temperature (200°C). In the comparative example (see the unfilled circle in Figure 4), the temperature of the outer circumferential surface 31a farther from the axial center decreases significantly. In particular, at the axial tip of the winding region R (16 mm from the tip to the axial base of the roller body 31), the temperature of the outer circumferential surface 31a was found to be approximately 5°C lower than the set temperature. On the other hand, in the example (see the filled circle in Figure 4), the temperature difference between the axial tip of the winding region R and the set temperature was reduced to approximately 1.5°C. Therefore, it was demonstrated that the temperature variation of the outer peripheral surface 31a in the axial direction is reduced by the heat equalization member 32 and the heat generating member 60 in the induction heating roller 20.

[0074] As described above, by inductively heating the heating element 60, which has low electrical resistivity, the amount of heat generated near the axial end of the outer cylinder portion 34 can be increased. This makes it easier to raise the temperature near the axial end of the outer cylinder portion 34. Furthermore, the heat generated in the heating element 60 is directly conducted to the heat equalization member 32. Therefore, the heat equalization member 32 can transmit the heat to the outer cylinder portion 34 in a substantially uniform manner in the axial direction, and consequently transmit the heat to the outer circumferential surface 31a of the roller body 31 in a substantially uniform manner. This prevents the temperature of only the axial end of the outer circumferential surface 31a of the roller body 31 from becoming abnormally high. In this way, the induction heating roller 20 can effectively reduce temperature variations in the outer cylinder portion 34 in the axial direction and effectively reduce temperature variations in the outer circumferential surface 31a.

[0075] Furthermore, a ring-shaped heating element 60, which can be easily and inexpensively manufactured, is provided as a separate component from the roller body 31 and the heat-distributing element 32. Therefore, compared to the case where the heating element 60 is integrally formed with the roller body 31 or the heat-distributing element 32, the increase in manufacturing effort and manufacturing costs can be suppressed.

[0076] Furthermore, a heat-distributing member 32 with high thermal conductivity is simply provided as a heat-distributing section that moves heat axially. Therefore, the structure of the roller unit 30 can be simplified compared to a configuration in which, for example, a jacket chamber (described later) is provided as a heat-distributing section.

[0077] Furthermore, in this embodiment, the heat-sensing member 32 is positioned radially inward of the outer cylinder portion 34, and the heat-generating member 60 is adjacent to the heat-sensing member 32 in the axial direction. Therefore, compared to, for example, the case where the heat-generating member 60 is positioned radially inward of the heat-sensing member 32, the heat-generating member 60 is positioned closer to the outer cylinder portion 34 in the radial direction. Consequently, deterioration of the heating efficiency of the outer cylinder portion 34 can be suppressed.

[0078] Furthermore, in this embodiment, the heat generated in the heat-generating member 60 can be directly conducted to the heat-soothing member 32. This prevents the temperature from becoming abnormally high only at the axial end of the outer peripheral surface 31a. Consequently, the temperature of the outer cylinder portion 34 can be effectively made uniform in the axial direction, and temperature variations on the outer peripheral surface 31a of the roller body 31 can be reduced.

[0079] Furthermore, in this embodiment, the heat generated in the heat-generating element 60 is not directly conducted to the outer cylinder portion 34, but is indirectly conducted to the outer cylinder portion 34 via the heat-sensing element 32. Therefore, compared to the case where the heat generated in the heat-generating element 60 is directly conducted to the outer cylinder portion 34, it is possible to more reliably suppress the abnormally high temperature of only the axial end of the outer cylinder portion 34.

[0080] Furthermore, in this embodiment, in a configuration where the roller body 31, the heat equalization member 32, and the heat generating member 60 are provided as separate components, both the heat equalization member 32 and the heat generating member 60 can be pressed toward the axial end (disc portion 36 side) by a single pressing portion 42. As a result, the heat equalization member 32 and the heat generating member 60 can be fixed to the roller body 31 by being sandwiched between the pressing portion 42 and the disc portion 36 in the axial direction. Therefore, the heat generating member 60 can be fixed to the roller body 31 with a simpler configuration compared to the case where the heat generating member 60 is positioned radially different from the heat equalization member 32.

[0081] Furthermore, in the induction heating roller 20 in which the roller body 31 is cantilevered, as in this embodiment, the axial end face (tip surface 36b) of the roller body 31 is exposed to the outside air. As a result, a large amount of heat is dissipated from the axial tip of the roller body 31, and there is a problem that the temperature of the axial tip of the outer cylinder portion 34 tends to drop particularly low. In this embodiment, however, the vicinity of the axial tip of the outer cylinder portion 34 is heated by the heating element 60, so the temperature drop of the axial tip of the outer cylinder portion 34 can be effectively suppressed. Therefore, temperature variations of the outer cylinder portion 34 can be effectively reduced, and temperature variations of the outer circumferential surface 31a of the roller body 31 can be reduced.

[0082] Furthermore, the heat-generating element 60 is made of a non-magnetic material. Therefore, situations in which the magnetic flux flows in a manner different from the intended way can be avoided.

[0083] Furthermore, the density of the heating element 60 (i.e., the density of the aluminum material that constitutes the heating element 60) is at least lower than the density of the outer cylinder portion 34 (i.e., the density of the carbon steel material that constitutes the outer cylinder portion 34). Therefore, the increase in weight of the induction heating roller 20 due to the provision of the heating element 60 can be suppressed.

[0084] Furthermore, if eddy currents flow more easily in the heat-soothing member 32 than in the outer cylinder portion 34 in the circumferential direction, the following problems may arise. First, when the heat-soothing member 32, which is positioned at a distance from the outer cylinder portion 34 that is the target of heating, generates heat, the heat may diffuse not only to the outer cylinder portion 34 but also to other members and / or space. The heat that diffuses in this way is not necessarily transferred uniformly to the outer cylinder portion 34. Also, since the heat-soothing member 32 is shorter than the outer cylinder portion 34 in the axial direction, when the heat-soothing member 32 generates heat, the heat distribution in the axial direction for the outer cylinder portion 34 becomes uneven. Due to these factors, there is a risk that the temperature variation of the outer cylinder portion 34 in the axial direction will increase. In this embodiment, in the axial direction, the thermal conductivity of the material constituting the heat-soothing member 32 is higher than the thermal conductivity of the material constituting the outer cylinder portion 34. Also, in the circumferential direction, the electrical resistivity of the material constituting the heat-soothing member 32 is higher than the electrical resistivity of the material constituting the outer cylinder portion 34. Therefore, the heat uniforming member 32 can facilitate the transfer of heat in the axial direction, and it can also suppress the flow of eddy currents in the heat uniforming member 32 in the circumferential direction, thereby suppressing unnecessary heat generation by the heat uniforming member 32 itself. As a result, it is possible to suppress large temperature variations in the outer cylinder portion 34 caused by heat generation from the heat uniforming member 32.

[0085] Furthermore, in the spinning and drawing apparatus 3 of this embodiment, the yarn Y is wound around an outer cylinder 34 in which temperature variations in the axial direction are reduced. Therefore, it is possible to reduce quality variations among multiple yarns Y heated by the induction heating roller 20.

[0086] Next, modified examples of the above embodiments will be described. However, components having the same configuration as the above embodiments will be denoted by the same reference numerals and their descriptions will be omitted as appropriate.

[0087] (1) In the above embodiment, the soaking member 32 is made of a C / C composite in which carbon fibers are oriented in the axial direction, and the heating member 60 is made of aluminum, but this is not limiting. The material constituting the soaking member 32 has anisotropy with respect to the thermal conductivity and electrical resistivity (that is, the thermal conductivity is different between the axial direction and the circumferential direction, and the electrical resistivity is different between the axial direction and the circumferential direction), but this is not limiting. As an example, as shown in FIG. 5(a), the soaking member 32 may be made of a C / C composite in which carbon fibers are randomly oriented. Also, the heating member 60 may be made of zinc. Specifically, the electrical resistivity of the randomly oriented C / C composite is 1.3×10 3 μΩ·cm. The electrical resistivity of zinc is 6.0 μΩ·cm. In this configuration as well, the density of the zinc constituting the heating member 60 is 7.1 g / cm 3 , which is lower than the density (7.8 g / cm 3 ) of the carbon steel constituting the roller body 31.

[0088] (2) In the above embodiments, the density of the material constituting the heating member 60 is lower than the density of the material constituting the roller body 31, but this is not limiting. As an example, as shown in FIG. 5(b), the soaking member 32 is made of aluminum (a metallic material), and the heating member 60 may be made of copper having an electrical resistivity (1.9 μΩ·cm) lower than the electrical resistivity (3.0 μΩ·cm) of aluminum. In this case, the density of the copper constituting the heating member 60 is 8.9 g / cm 3 , and the density of the carbon steel constituting the roller body 31 is 7.8 g / cm 3) is higher than ). Also, as mentioned above, the heat-distributing member 32 does not necessarily have to be made of C / C composite. At a minimum, the axial thermal conductivity of the material constituting the heat-distributing member 32 must be higher than the axial thermal conductivity of the material constituting the roller body 31. Specifically, the thermal conductivity of aluminum is 222 W / (m·K), which is higher than the thermal conductivity of carbon steel (51.5 W / (m·K)). Also, if the heat-distributing member 32 is made of a metallic material, the heat-distributing member 32 does not necessarily have to be divided into multiple heat-distributing pieces 41 (the heat-distributing member 32 may be made of, for example, a single substantially cylindrical member).

[0089] Furthermore, the combinations of materials constituting the roller body 31, the heat equalization member 32, and the heat generating member 60 are not limited to those described above. The heat generating member 60 only needs to be made of a material with a lower electrical resistivity than the materials constituting the roller body 31 and the heat equalization member 32. For example, the heat generating member 60 may be made of brass, gold, or silver. Also, in a configuration in which the heat generating member 60 is divided into multiple ring pieces, the multiple ring pieces do not necessarily have to be made of the same type of material. In other words, the multiple ring pieces may each be made of different types of material. In addition, in the circumferential direction, the electrical resistivity of the material constituting the heat equalization member 32 does not necessarily have to be higher than the electrical resistivity of the material constituting the roller body 31 (outer cylinder portion 34).

[0090] (3) In the embodiments described above, the heating element 60 was assumed to be made of a non-magnetic material, but it is not limited to this. Even if the heating element 60 is made of a ferromagnetic material, the heating element 60 may be used to heat the axial end of the outer cylinder 34 while suppressing the difficulty of magnetic flux passing through the axial end of the outer cylinder 34 by the heating element 60, by devising the size and arrangement of the heating element 60.

[0091] (4) The roller body 31 may be made of a ferromagnetic material other than carbon steel (such as cobalt or nickel). Alternatively, the roller body 31 does not necessarily have to be made of a ferromagnetic material.

[0092] (5) In the embodiments described above, the heating element 60 and the like are assumed to be in contact with the base end surface 36a of the disc portion 36, but this is not limited to this. In the axial direction, a spacer, for example, not shown, may be provided between the heating element 60 and the disc portion 36.

[0093] (6) In the embodiments described above, the heating element 60 was positioned radially away from the outer cylinder portion 34, but this is not limited to this configuration. For example, as shown in Figure 6(a), the outer peripheral surface 61a of the heating element 61 may be in contact with the inner peripheral surface 34b of the outer cylinder portion 34. This allows the heating element 61 to conduct heat directly with the outer cylinder portion 34. Such a configuration can be achieved by preheating and expanding the roller body 31 when assembling the heating element 61 to the roller body 31 during the manufacturing process (shrink fitting). In such a configuration, the outer cylinder portion 34 can be efficiently heated by the heat generated in the heating element 61. For this reason, this configuration is effective when the amount of heat generated in the heating element 61 is small. Furthermore, in such a configuration, the heating element 61 does not necessarily have to be in contact with the heat equalization member 32. In other words, the heating element 61 does not necessarily have to be able to conduct heat directly with the heat equalization member 32. As a specific example, as shown in Figure 6(b), a ring member 62 may be provided between the heat-generating member 61 and the heat-soothing member 32 in the axial direction. The thermal conductivity of the material constituting the ring member 62 may be lower than, for example, the thermal conductivity of the material constituting the roller body 31. In this case, the heat generated in the heat-generating member 61 is first conducted to the outer cylinder portion 34, and then conducted to the heat-soothing member 32 via the outer cylinder portion 34.

[0094] (7) In the embodiments described above, the inner circumferential surface 60b of the heating element 60 was assumed to be positioned approximately flush with the inner surface 41b of each heat uniforming piece 41, but this is not limited to this. For example, as shown in Figure 6(c), the inner surface 63b of the heating element 63 may be positioned radially outward from the inner surface 41b of each heat uniforming piece 41. Alternatively, as shown in Figure 6(d), the inner surface 64b of the heating element 64 may be positioned radially inward from the inner surface 41b.

[0095] Alternatively, as shown in Figure 6(e), the heating element 65 having an L-shaped cross-section may be arranged to contact both the tip surface 41d and the inner surface 41b of each heat-distributing piece 41. In this case, the "position of the tip end of the outer cylinder portion 34" is, for example, a position within 15 mm in the axial direction from the tip surface 36b of the disc portion 36 towards the base end. In other words, the heating element 65 is arranged to be within a region within 15 mm in the axial direction from the tip surface 36b towards the base end. It is more preferable that this region does not overlap with the winding region R (see Figure 2) in the axial direction. In this case, the structure of the portion of the roller unit 30 that constitutes the winding region R can be made substantially uniform in the axial direction.

[0096] (8) In the embodiments described above, the heating element 60 and the like are arranged in the axial direction alongside the heat equalization element 32, but this is not limited to this. For example, as shown in Figure 6(f), the heating element 66 may be arranged radially inside the heat equalization piece 41 and in contact with the inner surface 41b. In this case, the heating element 66 may be fixed to the disc portion 36 of the roller body 31 by, for example, a screw (not shown). In this case as well, the "position of the tip end of the outer cylinder portion 34" is defined in the same way as in the modified example in (7) above.

[0097] (9) In the embodiments described above, the coil 52 is assumed to be located radially inward of the outer cylinder portion 34, but this is not limited to this. Instead of the coil 52, a coil (not shown) may be located radially outward of the outer cylinder portion 34. In this case, the heating element 60 may be located adjacent to the radially outward side of the outer cylinder portion 34. In this case, at least a portion of the heating element 60 in the axial direction may be located axially towards the tip side of the base end face 36a of the disc portion 36.

[0098] (10) In the embodiments described above, the heating element 60 etc. is positioned at the tip end of the outer cylinder portion 34 in the axial direction, but is not limited to this. The heating element 60 etc. may be positioned at the base end of the outer cylinder portion 34 in the axial direction (for example, within a region of 10 mm from the axial base end to the axial tip end of the outer cylinder portion 34). It is more preferable that this region does not overlap with the winding region R (see Figure 2) in the axial direction.

[0099] (11) In the embodiments described above, the roller body 31 is assumed to be cantilevered, but it is not limited to this. That is, the induction heating roller 20 may have a roller body (not shown) that is cantilevered at both ends. In addition, disc portions (not shown) similar to the disc portion 36 described above may be arranged at both ends of the roller body in the axial direction.

[0100] (12) In the embodiments described above, the heat equalization member 32 (heat equalization section) is provided as a separate member from the roller body 31 (i.e., it is separable from the roller body 31), but it is not limited to this. The following will be described in detail with reference to Figure 7. As shown in Figure 7, in the induction heating roller 20A, the roller body 71 of the roller unit 70 has an outer cylinder 74 instead of the outer cylinder 34 described above. The roller unit 70 also has a heat equalization section 72 formed inside the roller body 71. The heat equalization section 72 is positioned radially between the outer circumferential surface 74a and the inner circumferential surface 74b of the outer cylinder 74. More specifically, the heat equalization section 72 has a jacket chamber 75 formed inside the outer cylinder 74. The jacket chamber 75 extends in the axial direction. A gas-liquid two-phase heat transfer medium (not shown) is sealed inside the jacket chamber 75. Such a heat equalization section 72 functions as a so-called heat pipe. More specifically, the gas inside the jacket chamber 75 moves at high speed in the axial direction, causing heat to move at high speed in the axial direction. The heat equalization section 72 may transfer heat axially to equalize the temperature of the outer circumferential surface 71a of the roller body 71. In this case, the heat generating element 67 may be in contact with the inner circumferential surface 74b of the outer cylinder portion 74. In this modified example, a fixing ring 73 is provided instead of the fixing ring 33, but the fixing ring 73 does not necessarily have to be a separate component from the roller body 71. The fixing ring 73 may be integrally formed with the roller body 71.

[0101] (13) In the embodiments described above, for example, the heating element 60 is provided as a separate component from the roller body 31 and the heat equalization member 32, but the embodiment is not limited to this. For example, a ring portion (not shown) which has a lower electrical resistivity than the outer cylinder portion 34 and functions as a heating element that is induced heated may be press-welded (welded) to the axial end of the outer cylinder portion 34. In this way, the ring portion may be integrally formed with the outer cylinder portion 34. In this configuration as well, the ring portion press-welded to the outer cylinder portion 34 is located adjacent to the outer cylinder portion 34. In this way, the ring portion can conduct heat directly to the outer cylinder portion 34 (i.e., without other parts). The ring portion press-welded to the outer cylinder portion 34 may be in contact with the heat equalization member 32, or it may be separated from the heat equalization member 32. Alternatively, such a ring portion may be press-welded to the heat equalization member 32. The ring portion press-welded to the heat equalization member 32 is located adjacent to the heat equalization member 32. As a result, the ring portion can conduct heat directly with the heat equalizing member 32. The ring portion pressed against the heat equalizing member 32 may be in contact with the outer cylinder portion 34, or it may be separated from the outer cylinder portion 34.

[0102] (14) The heating element 60 or the other heating element may be provided on an induction heating roller (not shown) for heating an object other than the thread Y (for example, toner for a printer). [Explanation of Symbols]

[0103] 3. Spinning and drawing machine 20 Induction heating roller 30 Roller Units 31 Roller body 32 Heat-distributing component (heat-distributing section) 34 Outer cylinder (cylindrical part) 34b Inner surface 42 Pressing part 52 coils 60 Heat-generating components (heat-generating parts) Y thread (object to be heated)

Claims

1. An induction heating roller comprising a rotatable roller unit and a coil, The aforementioned roller unit is A roller body having a cylindrical portion extending in the axial direction of the roller unit, wherein the cylindrical portion is inductively heated when current flows through the coil, A heat-distributing section is provided which allows heat generated in the cylindrical section to be transferred in the axial direction, and which allows heat to be transferred more easily in the axial direction than the cylindrical section. It has a heating element positioned at the end of the cylindrical portion in the axial direction, which is inductively heated when current flows through the coil, The aforementioned heating element is The material is made of a material with a lower electrical resistivity than the material constituting the cylindrical portion and the material constituting the heat-distributing portion. It is positioned adjacent to at least one of the cylindrical portion and the heat-distributing portion, It has a ring-shaped heating element that is provided as a separate component from the roller body and the heat equalization section and is in contact with the heat equalization section, The heat distribution section is positioned inside the cylindrical portion in the radial direction of the roller unit. The induction heating roller is characterized in that the heating element is arranged adjacent to the uniform heating element in the axial direction and spaced apart from the cylindrical element.

2. An induction heating roller comprising a rotatable roller unit and a coil, The aforementioned roller unit is A roller body having a cylindrical portion extending in the axial direction of the roller unit, wherein the cylindrical portion is inductively heated when current flows through the coil, A heat-distributing section is provided which allows heat generated in the cylindrical section to be transferred in the axial direction, and which allows heat to be transferred more easily in the axial direction than the cylindrical section. It has a heating element positioned at the end of the cylindrical portion in the axial direction, which is inductively heated when current flows through the coil, The aforementioned heating element is The material is made of a material with a lower electrical resistivity than the material constituting the cylindrical portion and the material constituting the heat-distributing portion. The cylindrical portion and the heat-distributing portion are arranged adjacent to at least one of them, The roller body is The cylindrical portion has a disc portion extending inward in the radial direction from one end in the axial direction of the roller unit, The aforementioned heat distribution section is The roller body is provided as a separate component and is in contact with the inner circumferential surface of the cylindrical portion, and has a heat-sensing member with a higher thermal conductivity in the axial direction than the cylindrical portion, The aforementioned heating element is It has a ring-shaped heating element, which is provided as a separate component from the roller body and the heat-distributing member and is arranged in the same direction as the heat-distributing member in the axial direction, An induction heating roller is characterized by being provided with a pressing portion that is positioned on the other side in the axial direction from the heat uniforming member and the heat generating member, and which presses the heat uniforming member and the heat generating member toward the one side.

3. The induction heating roller according to claim 2, characterized in that the density of the heating element is at least lower than the density of the cylindrical element.

4. The heat distribution section is positioned inside the cylindrical portion in the radial direction of the roller unit. The induction heating roller according to claim 2 or 3, characterized in that the heating element is arranged in the same direction as the heat distribution element in the axial direction.

5. The aforementioned heating element is An induction heating roller according to any one of 2 to 4, characterized in that it has a ring-shaped heating element provided as a separate component from the roller body and the heat-sensing section, and in contact with at least one of the cylindrical section and the heat-sensing section.

6. The induction heating roller according to any one of claims 2 to 5, characterized in that the heating element is arranged adjacent to the uniform heating element.

7. The induction heating roller according to claim 6, characterized in that the heating element is arranged at a distance from the cylindrical element.

8. The induction heating roller according to any one of claims 2 to 6, characterized in that the heating element is arranged adjacent to the cylindrical element.

9. The aforementioned heat distribution section is An induction heating roller according to any one of claims 1 to 8, characterized in that it has a heat-soothing member provided as a separate component from the roller body and in contact with the inner circumferential surface of the cylindrical portion, the heat-soothing member having a higher thermal conductivity in the axial direction than the cylindrical portion.

10. The roller body is cantilevered, The induction heating roller according to any one of claims 1 to 9, characterized in that the heating element is located at the tip end of the cylindrical portion in the axial direction.

11. The induction heating roller according to any one of claims 1 to 10, characterized in that the heating element is made of a non-magnetic material.

12. In the axial direction, the thermal conductivity of the material constituting the heat-distributing portion is higher than that of the material constituting the cylindrical portion. An induction heating roller according to any one of claims 1 to 11, characterized in that, in the circumferential direction of the roller unit, the electrical resistivity of the material constituting the heat-soothing portion is higher than the electrical resistivity of the material constituting the cylindrical portion.

13. A spinning and drawing apparatus comprising an induction heating roller according to any one of claims 1 to 12, A spinning and drawing apparatus characterized in that multiple threads are wound around the cylindrical portion in the axial direction as objects to be heated.

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