Yarn heater and false-twist texturing machine

Abstract

[Topic] Reduce power consumption without scaling up the device. [Solution] The device comprises: a heating unit (50) having a thread travel groove (56) extending along the extension direction for heating a thread (Y) traveling in the thread travel groove (56); a box (60) for housing the heating unit (50); a plurality of plate members (71, 72, 73, 74); a first sealing member (82); and a second sealing member (83). The plate members (71, 72, 73, 74) and the main body (61) of the box (60) are arranged opposite each other and separately, and are arranged in a direction away from the heating unit (50) in an imaginary plane orthogonal to the extension direction and intersecting the heating unit (50). The first sealing member (82) and the second sealing member (83) seal the ends of the inter-plate space (75) between the two opposing plate members and between the plate member (74) and the main body (61). In an imaginary plane orthogonal to the extension direction and intersecting the heating part (50), a plurality of air layers formed in the inter-plate space (75) are arranged in a direction away from the heating part (50).

Description

Wire heating devices and dummy cock processing machines The invention relates to a wire heating apparatus for heating the wire and a dummy processing machine having the wire heating apparatus. Previously, it is known that there are thread heating devices that heat the traveling thread in a processing machine that performs various processing such as merging processing and dummy processing on threads composed of synthetic fibers. In the dummy processing machine disclosed in patent literature 1, a primary heating unit (wire heating device) is provided with a box (insulation box), a heating device (heating part) housed in the storage space of the box, and an insulation material configured to fill the gap in the storage space containing the heating device. In the heating apparatus, a thread travel slot is formed to heat the thread traveling in the thread travel slot. [Previous Technical Literature] [Patent Literature] [Patent Literature 1] Japan Special Bulletin 2016-056494 [Invent the topic to be solved] In the above-mentioned thread heating devices, reduced power consumption is expected. Here, as a way to reduce the power consumption, increasing the thickness of the insulation is considered to reduce the amount of heat released to the outside from the heating part. However, the problem of large-scale wire heating devices is created by increasing the thickness of the insulation. It is the object of the invention to provide a wire heating apparatus capable of cutting power consumption without the largeization of the apparatus and a dummy machining machine having the wire heating apparatus. [Means used to solve problems] The thread heating device according to the first invention is to form a thread traveling passage with thread travel, with: heating part, extending along the direction of the thread travel pathway, that is, extending in the specified direction, heating the aforementioned threads traveling in the thread travel pathway; and in the imaginary plane intersecting with the aforementioned heating part, arranged in a direction far from the said heating part; Here, "the end of the interplate space between two opposing aforementioned plate members" refers to the boundary portion of the interplate space, which is the part of the interplate space that is not delineated by the two opposing plate parts. In this invention, by utilizing a plurality of air layers arranged in an imaginary plane in a direction away from the heating element, heat loss from the heating element to the outside can be suppressed. Furthermore, since the air layers have relatively low thermal conductivity, they provide sufficient insulation even with a small thickness. Moreover, since at least a portion of the ends of the inter-plate space is sealed by a sealing member, air movement between the inside and outside of the inter-plate space is suppressed. This suppresses convection within the air layers. Consequently, heat transfer between the two plate components constituting the inter-plate space is minimal, further enhancing the insulation performance of the air layers. Therefore, power consumption can be reduced without increasing the size of the device. The wire heating device according to the second invention is that, in the first invention, the space between the aforementioned plates is sealed. In this invention, because the space between the panels is sealed, the movement of air between the inside and outside of the space between the panels can be reliably suppressed. Therefore, the thermal insulation performance of the air layer can be further improved. The wire heating device according to the third invention is such that, in the first or second invention, the aforementioned plate components extend along the aforementioned predetermined direction. The aforementioned sealing component is made of heat-insulating material and includes a first sealing component that seals both ends of the aforementioned space between the plates along the aforementioned predetermined direction. In this invention, by sealing both ends of the space between the plates in a predetermined direction using a first sealing member, air can be prevented from entering or exiting from these ends. Furthermore, since the first sealing member sealing both ends of the space between the plates in a predetermined direction is made of heat-insulating material, heat transfer between adjacent plate components via the first sealing member can be suppressed. Therefore, the heat insulation performance caused by the air layer can be further improved. According to the fourth invention, the wire heating device is such that, in the first invention, the density of the aforementioned first sealing component is 80 kg / m³. 3 above. In this invention, by making the first sealing member high-density, it is possible to more reliably prevent air from entering and exiting the space between the plates through the first sealing member. Therefore, the space between the plates can be sealed more reliably. The wire heating device according to the fifth invention further includes a gasket component disposed in the space between the aforementioned plates, in any of the first to fourth inventions. When the thickness of the inter-plate space is uneven, convection can easily occur in the air layer formed in the inter-plate space due to the temperature difference generated there. In this invention, by placing a gasket component in the inter-plate space, the thickness of the inter-plate space can be made uniform. Therefore, convection in the air layer can be suppressed, thereby further improving the thermal insulation performance based on the air layer. According to the sixth invention, the wire heating device is such that, in the fifth invention, the aforementioned gasket components, which are respectively arranged in the space between two adjacent plates, are arranged at different positions in the aforementioned predetermined direction. When the gasket components, respectively disposed in the space between two adjacent plates, are positioned at the same location in a predetermined direction, heat can easily move between the plate components via these two gasket components. In this invention, heat is difficult to move between the plate components via the two gasket components, which further improves the thermal insulation performance caused by the air layer. According to the seventh invention, the wire heating device, in the fifth or sixth invention, at least one end of the aforementioned inter-plate space on one side of the orthogonal direction orthogonal to the aforementioned predetermined direction is sealed by a bend formed by bending the ends of the aforementioned two aforementioned plate members constituting the inter-plate space on the aforementioned side of the orthogonal direction. In two adjacent inter-plate spaces, the aforementioned bend that seals one of the inter-plate spaces and the aforementioned gasket member disposed in the other inter-plate space are disposed at different positions in the aforementioned orthogonal direction. In this invention, the space between the panels is sealed by a bending portion that is part of the panel component. Furthermore, heat is difficult to move between the panel components via the bending portion and the gasket component, which further improves the thermal insulation performance caused by the air layer. According to the eighth invention, the wire heating device is the same as that in the seventh invention, where the aforementioned bent portion functions as a gasket to ensure the spacing between the aforementioned two plate components. In this invention, the thickness of the space between the plates can be made uniform through the bending portion. According to the ninth invention, the wire heating device, in the seventh or eighth invention, when three adjacent plate components among the aforementioned plurality of plate components are designated as a first plate component, a second plate component, and a third plate component, the end of the inter-plate space between the first plate component and the second plate component in the aforementioned orthogonal direction on one side is sealed by a bend formed by bending the ends of the first plate component and the second plate component in the aforementioned orthogonal direction on the aforementioned side. The sealing component includes a second sealing component, which is made of heat-insulating material, and seals the end of the inter-plate space between the second plate component and the third plate component in the aforementioned orthogonal direction on the aforementioned side. When adjacent inter-plate spaces (i.e., the inter-plate space between the first and second plate components and the inter-plate space between the second and third plate components) are all sealed by bends, heat is sequentially transferred between the plate components via the bends sealing each inter-plate space. In this invention, the inter-plate space between the second and third plate components is sealed by a second sealing member made of thermal insulation material. Therefore, heat transfer from the first and second plate components via the bends of the plate components to the third plate component can be suppressed. As a result, the airtightness of each inter-plate space can be maintained, and the thermal insulation performance caused by the air layer can be further improved. According to the tenth invention, the wire heating device is, in the ninth invention, when the two aforementioned inter-plate spaces, the one closest to the aforementioned heating part and the one furthest from the aforementioned heating part, are sealed by the aforementioned bending part, the aforementioned bending part that seals the aforementioned two inter-plate spaces is located at different positions in the aforementioned orthogonal direction. When the bends that seal the spaces between the two plates are positioned in the same orthogonal direction, heat may move between the different plate components via these two bends. In this invention, heat is less likely to move between the different plate components via the two bends, thus further improving the thermal insulation performance caused by the air layer. The wire heating device according to the eleventh invention further includes a covering member in the ninth or tenth invention, which is made of heat-insulating material and covers the surface of the aforementioned inter-plate space sealed by the aforementioned bend portion, which is the opposite side of the aforementioned inter-plate space side of the aforementioned bend portion that seals at least the aforementioned inter-plate space closest to the aforementioned heating portion. In this invention, the heat release from the bending portion can be suppressed by the covering component. In particular, the heat release from the bending portion of the plate member, which is located near the heating portion and thus becomes hot, can be reliably suppressed. According to the twelfth invention, the wire heating device is such that, in the eleventh invention, the aforementioned second sealing component also serves as the aforementioned covering component. In this invention, the configuration of the wire heating device can be simplified compared to the case where the covering component and the second sealing component are different components. According to the thirteenth invention, the wire heating device is, in the twelfth invention, the aforementioned second sealing member seals the end of the aforementioned side of the aforementioned orthogonal direction of all the inter-plate spaces that are not sealed by the aforementioned bending portion in the aforementioned inter-plate space, and covers the surface of the aforementioned bending portion of all the inter-plate spaces that are sealed by the aforementioned bending portion that is opposite to the aforementioned inter-plate space side. In this invention, a second sealing component enables the airtightness of all inter-plate spaces and further enhances the thermal insulation performance caused by the air layer. According to the fourteenth invention, the wire heating device is such that, in the twelfth or thirteenth invention, each of the aforementioned plate components covers the entire heating part in the aforementioned orthogonal direction. The aforementioned bending portion, which is located in the space between the aforementioned plates that is sealed by the aforementioned bending portion and is closest to the aforementioned heating part, i.e., the first bending portion, is located in the space between the aforementioned plates that is sealed by the aforementioned bending portion. Compared with the aforementioned bending portions, i.e., the second bending portions, which seal the other spaces between the aforementioned plates, the second bending portions are located in the space closer to the aforementioned heating part in the aforementioned orthogonal direction. The thickness of the portion of the aforementioned second sealing component covering the aforementioned first bending portion in the aforementioned orthogonal direction is greater than the thickness of the portion covering the aforementioned second bending portion in the aforementioned orthogonal direction. In this invention, heat release from the first bending section, which is located near the heating section in the orthogonal direction and becomes hot, can be reliably suppressed. The wire heating device of the fifteenth invention, in any one of the ninth to fourteenth inventions, further includes a connecting member that connects the aforementioned plate components to each other, wherein the aforementioned first plate component and the aforementioned second plate component are fixed to each other at the aforementioned bend, and the aforementioned second plate component and the aforementioned third plate component are fixed to each other at the ends of the opposite side of the aforementioned orthogonal direction by the aforementioned connecting member. In this invention, the layer thickness between the first and second plate components can be maintained by fixing the bent portions of the first and second plate components. The layer thickness between the second and third plate components can also be maintained by fixing the connecting portion of the second and third plate components. Here, when the fixing portions of the first and second plate components and the fixing portions of the second and third plate components are arranged close together, heat easily moves between the first and third plate components via these two fixing portions. In this invention, the fixing portions of the first and second plate components (the portions with the bent portions) and the fixing portions of the second and third plate components (the portions connected by the connecting portion) can be separated in an orthogonal direction. Therefore, heat is less likely to move between the first and third plate components via the two fixing portions, further improving the thermal insulation performance caused by the air layer. The wire heating device according to the sixteenth invention is such that, in any of the first to eighth inventions, the aforementioned sealing member includes a second sealing member, which is made of heat-insulating material and seals the end of the aforementioned inter-plate space on one side of the orthogonal direction orthogonal to the aforementioned predetermined direction. In this invention, by sealing the end of the space between the sealing plates in the orthogonal direction with the second sealing member, air can be prevented from entering or exiting from that end. Furthermore, the second sealing member is made of heat-insulating material, which can prevent heat transfer between adjacent plate members via the second sealing member. Therefore, the heat insulation performance caused by the air layer can be further improved. According to the seventeenth invention, the wire heating device, in any of the ninth to sixteenth inventions, has a density of 80 kg / m³ for the aforementioned second sealing member. 3 above. In this invention, by making the second sealing member high-density, it is possible to more reliably prevent air from entering and exiting the space between the plates through the second sealing member. Therefore, the space between the plates can be sealed more reliably. According to the eighteenth invention, the wire heating device is such that, in any one of the first to seventeenth inventions, the thickness of the aforementioned air layer is 5 mm or more and less than 15 mm. If the air layer is thick, convection is more likely to occur. If convection occurs in the air layer, heat will easily move between the two plate components forming the space between them. On the other hand, if the air layer is thin, adjacent plate components may come into contact with each other. In this case, heat moves between the adjacent plate components via the contact portion. According to the present invention, the thickness of the air layer can be formed to a size that suppresses convection in the air layer and makes it difficult for the plate components to come into contact with each other. Therefore, the thermal insulation performance caused by the air layer can be further improved. The wire heating device according to the nineteenth invention further includes a heat insulation member in any one of the first to eighteenth inventions, which is disposed among the aforementioned plurality of plate members in a position closest to the aforementioned heating part between the aforementioned plate member and the aforementioned heating part. The surface of the heating element has exposed bolts and other fasteners used to secure the components constituting the heating element, resulting in uneven surfaces. Consequently, it is difficult to form a uniformly thick and highly insulating air layer between the surface of the heating element and the plate component. In this invention, by placing a heat-insulating component between the heating element and the plate component, heat loss from the heating element to the outside can be further suppressed. According to the twentieth invention, the thread heating device is such that, in any one of the first to nineteenth inventions, the aforementioned thread travel path is a thread travel groove, at least a portion of which is defined by the aforementioned heating unit and opens in an open direction orthogonal to the aforementioned defined direction. In this invention, the filament can be heated efficiently. According to the twenty-first invention, the wire heating device is such that, in the twenty-first invention, the aforementioned plurality of plate components are not disposed in the region in the aforementioned wire travel groove opposite to the open end of the aforementioned open direction. In this invention, a region that is opposite to the open end of the thread travel groove is provided, which is the area through which the thread passes when it is inserted into the thread travel groove. The thread heating apparatus according to the twenty-second invention is that in the twenty-first invention each of the foregoing plate members is a slot type extending in the direction specified for the foregoing and for opening in the direction of the foregoing open direction, and the plurality of the foregoing plate members are configured in a nested shape, the preceding plate member configured in the innermost part is configured to surround the heating portion of the foregoing. In the present invention, it is possible to vacate the area through which the thread passes when the thread is inserted into the thread travel slot, and to surround the heating portion by means of an air layer formed in the inter-plate space between two adjacent plate components. Thus, it is able to effectively suppress the heat release from the heating part to the outside. The thread heating apparatus according to the twenty-third invention is that in any one of the first to twenty-second inventions, the surface of the aforementioned plate member located at least close to the surface of the preceding plate member located in the interplate space closest to the preceding heating part in an opposing surface of the plural interplate spaces of the foregoing is mirror polished. In the present invention, the mirror polished surface of the plate component is utilized to suppress the radiant heat from the heating portion. Thus, it is able to suppress heat transfer due to radiation and further cut power consumption. In addition, the cost increases if mirror polishing is performed on the surfaces of multiple plate components. In the present invention, it is possible to suppress the radiant heat from the heating portion most effectively by performing a mirror polishing of the surface demarcated in the interplate space closest to the heating portion and is able to suppress the increase in cost. Furthermore, the dirt on the surface polished by the mirror can easily become obvious. However, in the present invention, the dirt attached to the mirror surface is difficult to notice due to the mirror polishing of the surface demarcating the space between the plates that is not visible from the outside. A dimple processing machine according to the twenty-fourth invention, a dimple processing machine for implementing a dimple processing on a thread, and having a thread heating apparatus of any of the first to twenty-third inventions. In the present invention, it is possible to cut the power consumption without making the wire heating device large. The dummy machine 1 of a preferred one embodiment of the invention is described with reference to FIG. In addition, set the vertical direction of the paper surface in Figure 1 to the body length direction and the left and right direction of the paper surface to the body width direction. The direction that is orthogonal to both sides of the direction of the length of the body and the direction of the width of the body is set to be the up and down direction of the action of gravity. The direction of body length and the direction of body width are directions roughly parallel to the horizontal direction. (Overall configuration of the dummy processing machine 1) The dummy processing machine 1 is, for example, configured to be able to perform dummy processing on thread Y composed of nylon (polyamide-based fibers), polyester and other synthetic fibers. The dummy machining machine 1 has a supply portion 2 for supplying thread Y, a machining unit 3 for dummy processing of the wire Y supplied from the wire supply unit 2, and a coiling portion 4 of the strand Y processed by the machining unit 3 in the reel tube Bw. The various constituent elements possessed by the thread supply section 2 , the processing section 3 , and the winding section 4 are arranged in a plurality in the direction of the body length (refer to Figure 2 ). The direction of the body length is an orthogonal direction to the traveling surface of thread Y (the paper surface of FIG. The thread feed section 2 has a creel stand 5 that holds a plurality of thread feed rolls (package) Ps. The thread supply section 2-way the machining section 3 supplies a plurality of threads Y. The machining section 3 performs a dummy on the thread Y supplied from the supply roll Ps. The machining section 3 is configured to be configured sequentially from the upstream side in the direction of the thread travel, a first supply roller 11, a stop thread guide 12, a first heating device 13 (equivalent to a "wire heating device" of the present invention), a cooling device 14, a dummy fixture device 15, a second thread supply roller 16, a crossover device 17, a third thread supply roller 18, and a second supply roller 19. The winding unit 4 has a plurality of winding devices 21 . Each winding device 21 winds the thread Y processed by the machining section 3 in a coiled cylinder tube Bw to form a coiled roll Pw. The dummy machine 1 has a main body 8 and a coiling table 9 configured at intervals in the direction of the body width. The main body 8 as well as the winding table 9 extending in the direction of the body length are set to approximately the same length. The main body 8 as well as the coiling stage 9 are configured to be mutually opposed in the direction of the body width. The upper part of the host body 8 is linked to the upper part of the coiling stage 9 via a support frame 10 . Each device constituting the machining section 3 is mounted primarily in the main body 8 or the supporting frame 10 . The various devices constituting the winding unit 4 are mounted on the winding table 9 . Through the main body 8 , the winding table 9 , and the supporting frame 10 , an operating space A is formed for the operator to perform operations such as thread hanging on each device. The thread channel is formed such that the thread Y travels mainly around the operating space A . The dummy machine 1 has a set of host bodies 8 comprising a mutually opposed configuration and a unit unit known as a span for the coiling stage 9 . In a span, a plurality of processing units (also known as lozenges) are arranged and configured in the direction of body length by forming a wire channel through the various devices that constitute the machining section 3 . Thereby, in a span it is possible to perform simultaneous pseudo-pinning processing for a plurality of threads Y traveling in a state arranged along the length of the body. In the dummy-stitch processing machine 1, the span takes the centerline C of the body width direction of the main body 8 as the axis of symmetry, and is configured symmetrically left and right on the paper surface. The main body 8 is a common part in the left and right spans. (Configuration of the machining part) The configuration of the machining part 3 is explained with reference to FIG. The first feed roller 11 is configured to transport to the first heating device 13 from the feed roll-mounted Ps backwind wire Y installed in the feed portion 2 . For example, as shown in FIG. 2 , the first feeder roller 11 is configured to transport a thread Y to the first heating device 13 The first feeder roller 11 can also be configured to transport adjacent plurality of threads Y to the downstream side of the thread's direction of travel, respectively. The stopper thread guide 12 is configured such that the jig applied to the thread Y by the dummy fixture device 15 does not turn upstream side propagation than the thread guide 12 still relies on the direction of thread travel. The first heating device 13 is a device for heating the thread Y transported from the first supply roller 11 to a prescribed processing temperature. For example, as shown in Figure 2 , the first heating device 13 is configured to be capable of heating two wires Y . More details of the first heating apparatus 13 will be described later. The cooling device 14 is configured to cool the thread Y after being heated by the first heating device 13 . For example, as shown in FIG. The cooling device 14 may also be configured to be capable of cooling multiple strands Y simultaneously. The sham device 15 is configured on the downstream side of the strand travel direction of the cooling device 14 . The fake cock device 15 is constituted to perform the addition of thread Y. The dummy device 15 is, for example, a dummy device in a so-called disc friction manner, but is not limited to this. The second supply roller 16 is configured to transport the thread Y processed by the dummy jig device 15 to the crossover device 17 . The transport speed of the second supply roller 16 to thread Y is faster than that of the first supply roller 11 to thread Y. Thereby, thread Y is stretched dummy between the first supply roller 11 and the second supply roller 16 . The junction device 17 is configured to apply junction junction to the strand Y . The interlace apparatus 17 has, for example, a well-known interlace nozzle having a interlace nozzle that applies interlace to the thread Y through an airflow. The third feeder roller 18 is configured to transport the thread Y traveling on the downstream side of the more than the crossover device 17 in the direction of the thread travel to the second heating device 19 . For example, as shown in FIG. Alternatively, the third feeder roller 18 may also be configured to be capable of transporting adjacent plurality of threads Y to the downstream side of the thread's direction of travel, respectively. In addition, the transport speed of the third supply roller 18 to thread Y is slower than that of the second supply roller 16 to thread Y. Thus, thread Y relaxes between the second donor roller 16 and the third donor roller 18 . The second heating apparatus 19 is configured to heat the thread Y transported from the third feeder roller 18 . The second heating apparatus 19 extends in the straight direction of the lead and is provided one of each in a span. The fourth feeder roller 20 is configured to transport the heated thread Y from the second heating device 19 to the winding device 21 . For example, as shown in FIG. 2 , the fourth feeder roller 20 is configured to be capable of transporting a thread Y to the winding device 21 . The fourth feeder roller 20 can also be configured as capable of transporting adjacent complex numbers of strands Y to the downstream side of the strand travel direction, respectively. The transport speed of 20 pairs of yarn Y by the fourth supply roller is slower than that of 18 pairs of yarn Y by the third supply roller. Thus, thread Y relaxes between the third donor roller 18 and the fourth donor roller 20 . In the machining section 3 constituted as above, the thread Y stretched between the first supply roller 11 and the second supply roller 16 is added by the dummy device 15 . The jig turn formed by the dummy device 15 propagates to the stopper thread guide 12 , but does not propagate to the upstream side than the stopper thread guide 12 , which still travels by the wire. The thread Y that is stretched while being fucked is cooled by the cooling device 14 after being heated and thermally set by the first heating apparatus 13 . Downstream of the thread travel direction of the dummy device 15 side strand Y is unpinned, but a state of strand Y being dummed as wavy is maintained by the above thermal stereotyping (i.e., the curling of strand Y is maintained). The thread Y of which the dummy is implemented is relaxed between the second feeder roller 16 and the third feeder roller 18 on one side, while the crossover is applied by the weaving device 17, after which it is guided downstream in the direction of the thread travel. Further, the side of the thread Y on the relaxed side between the third supply roller 18 and the fourth supply roller 20 is heat treated by the second heating device 19 . Finally, the thread Y transported from the fourth feeder roller 20 is coiled through the winding device 21 . (Configuration of the winding portion) The configuration of the winding portion 4 is explained with reference to FIG. The winding unit 4 has a plurality of winding devices 21 . Each winding device 21 is configured to be capable of winding thread Y on a winding cylinder tube Bw. The winding device 21 has a fulcrum thread guide 31 , a traverse device 32 , and a cradle 33 . The fulcrum thread guide 31 is a thread guide that becomes a fulcrum when thread Y is moved horizontally. The horizontal motion device 32 is configured to enable the thread Y to move horizontally by means of a horizontal motion thread guide 34 . The rocker 33 is configured to support the reel cylinder tube Bw for free rotation. Contact rollers 35 are provided near the rocker 33 . The contact roller 35 is in contact with the surface of the coiled roll Pw and a contact pressure is applied. In the winding portion 4 constituted as above, the yarn Y from the above-mentioned fourth conveyed by the roller 20 is reeled in the winding cylinder tube Bw by each winding device 21 , thereby forming the winding roll Pw. (First Heating Device) Next, the more specific configuration of the first heating device 13 will be described with reference to Figures 3 to 8. Additionally, the illustration of the second sealing member 83 is omitted in Figure 7 for illustrative purposes. Figure 8 is a diagram used to explain the thicknesses Ta1, Tb1, Ta2, and Tb2, which will be described later; symbols not needed in the description are appropriately omitted. As shown in Figure 3, the first heating device 13 extends along a predetermined extension direction (equivalent to the "predetermined direction" of the present invention) orthogonal to the length direction of the machine body. In this embodiment, the extension direction is parallel to the width direction of the machine body. The extension direction may also be inclined relative to the width direction of the machine body. As will be described in detail later, the first heating device 13 has a thread travel groove 56 extending along the extension direction (see FIG5). The thread travel groove 56 corresponds to the "thread travel path" of the present invention. The first heating device 13 is configured to heat the thread Y that travels from one side to the other in the thread travel groove 56 in the extension direction. In this embodiment, the first heating device 13 is configured to heat two threads Y (threads Ya and Yb: see FIG5). As shown in Figure 4, the first heating device 13 mainly includes a heating section 50, heat insulation blocks 91, 92, and 93, a housing 60, and plate components 71, 72, 73, and 74. As shown in Figure 5(b), the heating section 50 has thread travel grooves 56 (56a, 56b) extending along the extension direction. The thread travel grooves 56 (56a, 56b) open downwards. The heating section 50 heats the threads Y (threads Ya, Yb) traveling in the thread travel grooves 56 (56a, 56b). As shown in Figure 4, the housing 60 houses the heating section 50 and the heat insulation blocks 91, 92, and 93. The plate components 71, 72, 73, and 74 are disposed between the heating section 50 and the inner wall of the housing 60. As shown in Figure 5(a), the heating section 50 mainly includes a heat source 51, two heating blocks 52 (52a, 52b), and two connecting parts 54 (54a, 54b). The heat source 51 is, for example, a sheathed heater. As shown in Figure 6, the heat source 51 extends along the extending direction. The heating blocks 52 and the connecting parts 54 are configured to be heated by heat generated by the heat source 51. The heating blocks 52 and the connecting parts 54 extend along the extending direction of the heat source 51. As shown in Figure 4, bolts 59 and the like for fixing the components constituting the heating section 50 are exposed on the surface of the heating section 50. Heating block 52a and wire connector 54a are components for heating wire Ya. Heating block 52b and wire connector 54b are components for heating wire Yb. The components for heating wire Ya and the components for heating wire Yb are arranged on opposite sides of each other along the length of the machine body, separated by heat source 51. Referring to FIG5, the component for heating wire Ya will be described. The heating block 52a is made of a metal material with a high specific heat, such as brass. The heating block 52a is configured to contact the heat source 51. The heating block 52a is located on one side of the heat source 51 along its length (left side of the paper in FIG5(a)). A recess 53 (53a) extending along the extending direction is formed in the heating block 52a. The recess 53a opens downwards. A wire receiving portion 54 (54a) is housed within the recess 53a. The wire-connecting portion 54a is, for example, a long strip component made of SUS. The wire-connecting portion 54a is fixed to the heating block 52a while in contact with it. The wire-connecting portion 54a is heated by heat transferred from the heat source 51 via the heating block 52a. The wire-connecting portion 54a has a wire-connecting surface 55 (55a) for contacting the wire Y. The wire-connecting surface 55a faces downward. As shown in FIG5(b), the wire-connecting surface 55a is bent into a generally U-shaped form with a downward convex shape in a cross-section orthogonal to the length direction of the body. As shown in FIG5(a), the wire-connecting surface 55a is bent into an inverted U-shaped form with an upward convex shape when viewed from the extending direction. The wire travel groove 56 (56a) is defined by the wall surface of the recess 53a of the heating block 52a and the wire receiving surface 55a of the wire receiving portion 54a. The wire travel groove 56 (56a) is open on the lower surface of the heating block 52a. The wire travel groove 56 (56a) opens downwards. In other words, the direction from the inside to the outside of the wire travel groove 56 (56a) is downwards. The "opening direction" of the present invention is downwards. Furthermore, the components used for heating the wire Yb will be described. The heating block 52b is disposed on the opposite side of the heat source 51 along its length (right side of the paper in FIG. 5(a)). The heating block 52b is in contact with the heat source 51. The heating block 52b has a recess 53b with the same shape as the recess 53a. A wire-connecting portion 54b with the same structure as the wire-connecting portion 54a is housed within the recess 53b. The wire-connecting portion 54b has a wire-connecting surface 55b with the same shape as the wire-connecting surface 55a. The wire travel groove 56b is defined by the wall surface of the recess 53b of the heating block 52b and the wire-connecting surface 55b of the wire-connecting portion 54b. Further details are omitted. The wires Y (Ya, Yb) fed into the first heating device 13 travel in the wire travel grooves 56 (56a, 56b) while contacting the receiving surfaces 55 (55a, 55b). Thus, the wires Y (Ya, Yb) are heated by receiving heat from the heating blocks 52 (52a, 52b) via the receiving surfaces 55 (55a, 55b). By appropriately setting the type of wire Y, the grade (thickness) of wire Y, the travel speed of wire Y, and the heating temperature, the temperature of wire Y can be optimized for processing. As shown in Figures 4 and 6, heat insulation blocks 91, 92, and 93 are positioned below the heating section 50. Heat insulation blocks 91, 92, and 93 are constructed, for example, from gypsum board. Heat insulation blocks 91, 92, and 93 all extend along the extending direction. Heat insulation blocks 91, 92, and 93 are arranged along the length of the machine body. The gap between heat insulation blocks 91 and 92 forms a passageway for inserting thread Ya into the thread travel groove 56a. The gap between heat insulation blocks 92 and 93 forms a passageway for inserting thread Yb into the thread travel groove 56b. As shown in Figure 4, the box 60 mainly comprises a main body 61 and a door 62. The main body 61 is a hollow component with a generally rectangular parallelepiped shape extending along its length. The door 62 is capable of closing the opening 68 formed in the main body 61, which will be described later. The main body 61 is made of sheet metal. The main body 61 is, for example, made of SUS steel. The main body 61 has an upper wall 61a, two side walls 61b, two side walls 61c, and a lower wall 61d. As shown in FIG. 4, the upper wall 61a extends along the length of the body when viewed from the extending direction. The two side walls 61b are connected to both ends of the upper wall 61a in the length of the body. As shown in FIG. 6, the two side walls 61c are connected to both ends of the upper wall 61a in the extending direction. Both side walls 61b and 61c extend vertically. As shown in FIG. 4, the lower wall 61d is located below the upper wall 61a. The lower wall 61d is parallel to the upper wall 61a. The upper wall 61a and the two side walls 61b of the main body 61 correspond to the "sheet metal component" of the present invention. As shown in Figure 4, the main body 61 has an opening 68 formed in the vertical direction at a portion opposite to the open end (lower end) of the wire travel groove 56. The open end of the wire travel groove 56 refers to the portion of the wire travel groove 56 that is open in the lower surface of the heating block 52. The opening 68 extends along the entire length of the main body 61. The opening 68 is formed in the lower wall 61d. The lower wall 61d is positioned differently in the vertical direction on either side of the opening 68 along its length along the fuselage side. Specifically, the lower surface of the first portion 61d1 on one side of the lower wall 61d along the fuselage length (left side of the paper in Figure 4) lies on an imaginary plane P1 orthogonal to the vertical direction. On the other hand, the lower surface of the second portion 61d2 on the other side of the lower wall 61d along the fuselage length (right side of the paper in Figure 4) lies on an imaginary plane P2 orthogonal to the vertical direction. The imaginary plane P1 is positioned higher than the imaginary plane P2. Furthermore, as shown in Figures 6 and 7, openings 69 are formed at both ends of the sidewalls 61c in the extending direction of the main body 61. The openings 69 are formed at the center of the sidewalls 61c in the longitudinal direction of the body. The lower side of the openings 69 is open. The openings 69 function as the inlet and outlet of the thread Y traveling in the thread travel groove 56. As shown in Figures 4 and 6, door 62 is a plate-shaped component extending along the extension direction. Door 62 is configured to swing about a shaft 62a extending along the extension direction. Shaft 62a is mounted on the main body 61. Shaft 62a is located below the first portion 61d1 of the lower wall 61d of the main body 61. As shown in Figure 4, when the door 62 is in the closed position, it covers the first part 61d1 of the lower wall 61d of the main body 61 and the opening 68. Thus, the opening 68 is closed by the door 62. When the door 62 is in the closed position, it swings downwards (clockwise in Figure 4) around axis 62a. When it reaches the open position shown by the dashed line in Figure 4, the opening 68 of the main body 61 is open. That is, the door 62 is configured to move between the closed position (closing the opening 68 of the main body 61) and the open position (opening the opening 68). When the door 62 is in the open position, the thread Y can be inserted into the main body 61 of the box 60 through the opening 68, and the thread Y is set in the thread travel groove 56. Each plate component 71, 72, 73, and 74 is made of a single sheet of metal. Plate components 71, 72, 73, and 74 are, for example, made of SUS steel. Each plate component 71, 72, 73, and 74 may also be made of multiple sheets of metal. Plate components 71, 72, 73, and 74 all extend along the extension direction. Plate components 71, 72, 73, and 74 are generally groove-shaped, opening downwards (the opening direction of the wire travel groove 56). As shown in Figure 4, plate component 71 has an upper wall 71a and two side walls 71b. The upper wall 71a extends along the length of the body when viewed from the extension direction. The two side walls 71b are respectively connected to the two ends of the upper wall 71a in the length direction of the body. The side walls 71b extend in the vertical direction. Plate components 72, 73, and 74 have upper walls 72a, 73a, and 74a and two side walls 72b, 73b, and 74b of the same shape as plate component 71. The four plate components 71, 72, 73, and 74, as well as the upper wall 61a and two side walls 61b of the main body 61 of the housing 60, are arranged in a nested configuration. The innermost plate component 71 is configured to surround the heating element 50. Plate component 72 is configured to surround plate component 71. Plate component 73 is configured to surround plate component 72. Plate component 74 is configured to surround plate component 73. Furthermore, the upper wall 61a and two side walls 61b of the main body 61 of the housing 60 are configured to surround plate component 74. In the area opposite to the lower end of the wire travel groove 56 (corresponding to the "open end" of the present invention), the four plate components 71, 72, 73, and 74, as well as the upper wall 61a and two side walls 61b of the main body 61 (corresponding to the "plate components" of the present invention), are not arranged. The four plate components 71, 72, 73, and 74, and the main body 61 are arranged sequentially away from the heating part 50 in an imaginary plane (e.g., the paper in FIG. 4) orthogonal to the extending direction and intersecting the heating part 50. That is, the plate component 71 is positioned closest to the heating part 50 among the four plate components 71, 72, 73, 74, and the main body 61. A heat insulation component 80 is disposed between the plate component 71 and the heating part 50. The heat insulation component 80 is, for example, ceramic fiber or glass wool. Furthermore, the upper wall 61a and the two side walls 61b of the main body 61 correspond to the "plate component furthest from the heating part" of the present invention. The upper walls 71a, 72a, 73a, 74a, and 61a of the plate components 71, 72, 73, 74 and the main body 61 are located above the heating part 50. The lower ends of the side walls 71b, 72b, 73b, 74b, and 61b of the plate components 71, 72, 73, 74 and the main body 61 are located below the heating part 50. That is, the plate components 71, 72, 73, 74 and the main body 61 cover the entire heating part 50 in the vertical direction (corresponding to the "orthogonal direction" of the present invention). Four plate components 71, 72, 73, and 74, the upper wall 61a of the main body 61, and the two side walls 61b are arranged opposite each other and separately. Inter-plate spaces 75a, 75b, and 75c are formed between the opposing plate components. Inter-plate space 75a is formed between adjacent plate components 71 and 72. Inter-plate space 75b is formed between adjacent plate components 72 and 73. Inter-plate space 75c is formed between adjacent plate components 73 and 74. Furthermore, an inter-plate space 75d is formed between plate component 74 and the upper wall 61a and the two side walls 61b of the main body 61. Hereinafter, inter-plate spaces 75a, 75b, 75c, and 75d are referred to as inter-plate space 75. As shown in Figure 4, each inter-plate space 75 is a slot-shaped space that opens downwards when viewed from the extending direction. Each inter-plate space 75 is an undivided space. Each inter-plate space 75 is sealed. Air layers are formed in each of the four inter-plate spaces 75. That is, in an imaginary plane (e.g., the plane of the paper in FIG4) orthogonal to the extending direction and intersecting the heating element 50, four air layers are arranged in each inter-plate space 75 in a direction away from the heating element 50. The thickness of the air layer is preferably 5 mm or more and less than 15 mm. The thickness of the air layer can also be greater than 0 and less than 5 mm. The thickness of the air layer can also be 15 mm or more. In this embodiment, the thickness of each of the four air layers is 10 mm. The thicknesses of the four air layers can also be different. The opposing surfaces of the two plate members 71 and 72 in the inter-plate space 75 closest to the heating part 50, which constitutes the four inter-plate spaces 75, are mirror-polished. That is, the surface of the plate member 71 closest to the heating part 50, which is opposite to the heating part 50, is mirror-polished. In addition, the surface of the plate member 72 furthest from the heating part 50, which is on the side facing the heating part 50, is mirror-polished. As shown in Figures 6 and 7, in the extending direction, first sealing members 82 are respectively disposed between the two ends of the plate members 71, 72, 73, and 74 and the side wall 61c in the main body 61 of the box 60. The first sealing members 82 seal the two ends in the extending direction of each of the four inter-plate spaces 75. Here, the two ends in the extending direction of each inter-plate space 75 are the boundary portions of the inter-plate space 75, which are the portions of the inter-plate space 75 not defined by the two plate members constituting the inter-plate space 75. By sealing the two ends in the extending direction of the inter-plate space 75 with the first sealing members 82, air can be prevented from entering or exiting the inter-plate space 75 through these ends. The first sealing element 82 is made of, for example, an insulating material such as asbestos (rock wool). The material of the first sealing element 82 is not limited to asbestos. The density of the first sealing element 82 is preferably 80 kg / m³. 3 The density of the first sealing component 82 can also be less than 80 kg / m³. 3 The density of the insulation material constituting the first sealing component 82 is preferably determined with consideration of the air permeability of the first sealing component 82. The lower the air permeability of the first sealing component 82 (the higher the density), the less air leaks from the inter-plate space 75, and the higher the airtightness of the inter-plate space 75. As shown in Figures 4 and 7, a bent portion 71c is formed at the lower end of the plate member 71. In Figure 7, the bent portion 71c is shaded on its lower surface for easier understanding. The bent portion 71c is formed at the lower ends of the two side walls 71b in the plate member 71. The bent portion 71c of the side wall 71b on one side of the heat insulation block 92 in the body length direction (left side of the paper in Figure 4) is formed by bending the lower end of the side wall 71b approximately 90° in the body length direction. The bent portion 71c of the side wall 71b on the other side of the heat insulation block 92 in the body length direction (right side of the paper in Figure 4) is formed by bending the lower end of the side wall 71b approximately 90° in the body length direction. As shown in Figure 7, the bent portion 71c extends along the entire length of the plate member 71 in the extending direction. Three protrusions 71d are formed in the bent portion 71c on each sidewall 71b. The three protrusions 71d are located at both ends and the center of the bent portion 71c in the extending direction. The length of the bent portion 71c in the body length direction, excluding the portion where the protrusions 71d are formed, is approximately the same as the interval in the body length direction between the plate members 71 and 72. The length of the bent portion 71c in the portion where the protrusions 71d are formed is approximately the same as the interval in the body length direction between the plate members 71 and 73. As shown in Figure 4, a bent portion 72c is formed at the lower end of the plate member 72. The bent portion 72c is formed at the lower end of the two side walls 72b in the plate member 72. The bent portion 72c of the side wall 72b on one side of the heat insulation block 92 in the body length direction (left side of the paper in Figure 4) is formed by bending the lower end of the side wall 72b approximately 90° toward the other side in the body length direction. The bent portion 72c of the side wall 72b on the other side of the heat insulation block 92 in the body length direction (right side of the paper in Figure 4) is formed by bending the lower end of the side wall 72b approximately 90° toward one side in the body length direction. The bending portion 72c extends along the entire length of the plate member 72 in the extending direction. The length of the bending portion 72c in the body length direction is approximately the same as the distance between the plate members 71 and 72 in the body length direction. The bending portion 72c is located above the bending portion 71c of the plate member 71. The bent portion 71c of plate member 71 and the bent portion 72c of plate member 72 are fixed together by bolts (not shown). That is, plate members 71 and 72 are fixed together at the bent portions 71c and 72c. The lower end of the inter-plate space 75a (corresponding to the "orthogonal direction side" in this invention) is sealed by the bent portions 71c and 72c of the two plate members 71 and 72 constituting the inter-plate space 75a. The bent portions 71c and 72c also function as gaskets to ensure the spacing between the two plate members 71 and 72. Furthermore, the protrusion 71d in the bent portion 71c of the plate member 71 functions as a gasket to ensure the spacing between the plate members 72 and 73. As shown in Figures 4 and 7, a bent portion 73c is formed at the lower end of the plate member 73. In Figure 7, the bent portion 73c is shaded on its lower surface for easier understanding. The bent portion 73c is formed at the lower ends of the two side walls 73b in the plate member 73. The bent portion 73c of the side wall 73b on one side of the body length direction (left side of the paper in Figure 4) is formed by bending the lower end of the side wall 73b approximately 90° toward one side of the body length direction. The bent portion 73c of the side wall 73b on the other side of the body length direction (right side of the paper in Figure 4) is formed by bending the lower end of the side wall 73b approximately 90° toward the other side of the body length direction. As shown in Figure 7, the bent portion 73c extends along the entire length of the plate member 73 in the extension direction. The length of the bent portion 73c in the body length direction is approximately the same as the distance between the plate members 73 and 74 in the body length direction. As shown in Figure 7, clamping plates 78 are installed on the lower surfaces of the bent portions 73c of the two sidewalls 73b respectively formed in the plate member 73. The clamping plate 78 installed on the sidewall 73b of the plate member 73, located on one side of the heat insulation block 92 in the body length direction (upper side of the paper in Figure 7), extends to the sidewall 61b of the main body 61 on the side further along the body length direction than the bent portion 73c. ​​The clamping plate 78 installed on the other side of the sidewall 73b of the plate member 73, located on the other side of the heat insulation block 92 in the body length direction (lower side of the paper in Figure 7), extends to the sidewall 61b of the main body 61 on the other side of the bent portion 73b in the body length direction. The clamping plate 78 also functions as a gasket to ensure the distance between the plate member 74 and the main body 61. Three clamping plates 78 are installed on each of the bends 73c formed on the two side walls 73b of the plate member 73. The three clamping plates 78 installed on one bend 73c are arranged at different positions in the extending direction. The clamping plate 78 located on one side of the extending direction (left side of the paper in FIG. 7) is located between the protrusion 71d on one side of the extending direction and the central protrusion 71d of the three protrusions 71d formed on the bend 71c. The clamping plate 78 located on the other side of the extending direction (right side of the paper in FIG. 7) is located between the protrusion 71d on the other side of the extending direction and the central protrusion 71d of the three protrusions 71d formed on the bend 71c. The clamping plate 78 located at the center of the extending direction is located at the same position in the extending direction as the central protrusion 71d of the three protrusions 71d formed on the bend 71c. As shown in Figure 4, a bent portion 74c is formed at the lower end of the plate member 74. The bent portion 74c is formed at the lower end of the two side walls 74b in the plate member 74. The bent portion 74c of the side wall 74b on the side of the heat insulation block 92 in the body length direction (left side of the paper in Figure 4) is formed by bending the lower end of the side wall 74b approximately 90° toward the other side in the body length direction. The bent portion 74c of the side wall 74b on the other side of the heat insulation block 92 in the body length direction (right side of the paper in Figure 4) is formed by bending the lower end of the side wall 74b approximately 90° toward one side in the body length direction. The bending portion 74c extends along the entire length of the plate member 74 in the extending direction. The length of the bending portion 74c in the body length direction is approximately the same as the distance between the plate members 73 and 74 in the body length direction. The bending portion 74c is located above the bending portion 73c of the plate member 73. The bent portions 73c of plate component 73 and 74c of plate component 74 are fixed by bolts (not shown). That is, plate components 73 and 74 are fixed to each other at the bent portions 73c and 74c. The lower end of the inter-plate space 75c (corresponding to the "orthogonal side" of the present invention) is sealed by the bends 73c and 74c of the two plate members 73 and 74 constituting the inter-plate space 75c. The bends 73c and 74c also function as gaskets to ensure the spacing between the two plate members 73 and 74. As described above, the inter-plate space 75a, which is closest to the heating part 50 among the four inter-plate spaces 75, is sealed by bending portions 71c and 72c (corresponding to the "first bending portion" of the present invention). Furthermore, the inter-plate space 75c is sealed by bending portions 73c and 74c (corresponding to the "second bending portion" of the present invention). The bent portions 71c, 72c and 73c, 74c, which seal the spaces 75a and 75c between the two plates respectively, are all located below the heating portion 50. Furthermore, the vertical positions of the bent portions 71c, 72c and 73c, 74c are different. More specifically, the bent portions 71c, 72c are located above the bent portions 73c, 74c. Compared to the bent portions 73c, 74c, the bent portions 71c, 72c are located closer to the heating portion 50 in the vertical direction. As shown in Figure 4, a second sealing member 83 is disposed between the lower ends of the plate members 71, 72, 73, and 74 and the lower wall 61d of the main body 61 of the housing 60 in the vertical direction. The second sealing members 83 are respectively disposed on both sides of the opening 68 formed in the main body 61 of the housing 60 in the longitudinal direction of the housing. The second sealing members 83 seal the lower ends of the inter-plate spaces 75b and 75d. That is, the second sealing members 83 seal the lower ends of all inter-plate spaces 75 that are not sealed by the bent portion, namely the lower ends of the inter-plate spaces 75b and 75d. That is, in the two inter-plate spaces formed by three adjacent pieces (corresponding to the "first plate component, second plate component, and third plate component" of the main body 61 (upper wall 61a and two side walls 61b) of the plate components 71, 72, 73, 74 and the main body 61, one of which is sealed by the bending portions 71c, 72c, 73c, 74c, and the other is sealed by the second sealing member 83. For example, considering the three adjacent plate components 71, 72, 73, the inter-plate space 75a between plate components 71 and 72 is sealed by the bending portions 71c and 72c, and the inter-plate space 75b between plate components 72 and 73 is sealed by the second sealing member 83. Here, the lower end of the inter-plate space 75b is the boundary of the inter-plate space 75b, which is the portion of the inter-plate space 75b not defined by the plate members 72 and 73 constituting the inter-plate space 75b. Similarly, the lower end of the inter-plate space 75d is the boundary of the inter-plate space 75d, which is the portion of the inter-plate space 75d not defined by the plate member 74 and the main body 61 constituting the inter-plate space 75d. By sealing the lower end of the inter-plate spaces 75b and 75d through the second sealing member 83, air can be prevented from entering or exiting the inter-plate spaces 75b and 75d via these ends. The second sealing member 83 covers the lower surface (the surface opposite to the inter-plate space 75a side) of the bent portion 71c of the sealing inter-plate space 75a. Furthermore, the second sealing member 83 covers the lower surface (the surface opposite to the inter-plate space 75c side) of the bent portion 73c of the sealing inter-plate space 75c. That is, the second sealing member 83 corresponds to the "covering member" of the present invention. Specifically, the second sealing member 83 covers the lower surfaces of the bent portions 71c and 73c of all inter-plate spaces 75 sealed by the bent portions, namely inter-plate spaces 75a and 75c. Here, as shown in FIG8, in the second sealing member 83 located on the side of the opening 68 along the length direction of the body (left side of the paper in FIG8), the thickness in the vertical direction of the portion covering the bent portion 71c of the space between the sealing plates 75a is set as thickness Ta1. Furthermore, in this second sealing member 83, the thickness in the vertical direction of the portion covering the bent portion 73c of the space between the sealing plates 75c is set as thickness Tb1. At this time, thickness Ta1 is greater than thickness Tb1. Furthermore, in the second sealing member 83 located on the other side of the opening 68 along the length of the body (the right side of the paper in FIG8), the thickness in the vertical direction of the portion covering the bent portion 71c of the space between the sealing plates 75a is set to thickness Ta2. Furthermore, in this second sealing member 83, the thickness in the vertical direction of the portion covering the bent portion 73c of the space between the sealing plates 75c is set to thickness Tb2. In this case, thickness Ta2 is greater than thickness Tb2. The second sealing member 83 is made of, for example, an insulating material such as asbestos. The material of the second sealing member 83 is not limited to asbestos. The density of the second sealing member 83 is preferably 80 kg / m³. 3 The density of the second sealing component 83 can be less than 80 kg / m³. 3 The density of the insulation material constituting the second sealing component 83 is preferably determined with consideration of the air permeability of the second sealing component 83. The lower the air permeability (the higher the density) of the second sealing component 83, the less air escapes from the inter-plate spaces 75a and 75c, and the higher the airtightness of the inter-plate spaces 75a and 75c. As shown in Figures 4 and 6, a plurality of gasket components 81 are disposed in each inter-plate space 75. As shown in Figure 4, the gasket components 81 are disposed at the corners of the inter-plate space 75, which has a slot shape that opens downwards. In other words, the gasket components 81 are respectively disposed at both ends of the body length direction in the upper part of the inter-plate space 75. The bent portions 71c and 72c of the sealing inter-plate space 75a and the gasket members 81 disposed in the adjacent inter-plate space 75b of the inter-plate space 75a are arranged at different positions in the vertical direction. The bent portions 73c and 74c of the sealing inter-plate space 75c and the gasket members 81 disposed on both sides of the adjacent inter-plate spaces 75b and 75d of the inter-plate space 75c are arranged at different positions in the vertical direction. Furthermore, as shown in FIG6, the gasket members 81 disposed in two adjacent inter-plate spaces 75 are arranged at different positions in the extending direction. As described above, adjacent plate members 71 and 72 are fixed to each other at bending portions 71c and 72c. Furthermore, adjacent plate members 73 and 74 are fixed to each other at bending portions 73c and 74c. Adjacent plate members 72 and 73 are fixed to each other via connecting member 84. Moreover, plate member 74 is fixed to the main body 61 of the housing 60 via connecting member 85. As shown in Figures 4 and 6, the connecting member 84 is disposed in the inter-plate space 75b. The connecting member 84 is disposed at the center of the body along its length in the upper part of the inter-plate space 75b, which has a downwardly opening slot shape. The connecting member 84 is disposed at both ends in the extending direction of the inter-plate space 75b. Plate members 72 and 73 are fixed to each other at their upper ends via the connecting member 84. As shown in Figures 4 and 6, the connecting member 85 is disposed in the inter-plate space 75d. The connecting member 85 is disposed at the center of the body along its length in the upper part of the inter-plate space 75d, which has a downwardly opening slot shape. The connecting member 85 is disposed at both ends in the extending direction of the inter-plate space 75d. The plate member 74 and the main body 61 of the box 60 are fixed to each other at their upper ends via the connecting member 85. (Features of the Embodiment) As described above, the first heating device 13 of this embodiment has a wire travel groove 56 extending along the extension direction, and includes a heating part 50 for heating the wire Y traveling in the wire travel groove 56, a box 60 for housing the heating part 50, a plurality of plate members 71, 72, 73, 74, a first sealing member 82, and a second sealing member 83. The upper wall 61a and two side walls 61b of the plate members 71, 72, 73, 74 and the main body 61 of the box 60 are arranged opposite each other and separately, and are arranged in a direction away from the heating part 50 in an imaginary plane orthogonal to the extension direction and intersecting with the heating part 50. The first sealing member 82 and the second sealing member 83 seal at least a portion of the end of the inter-plate space 75 between the two opposing plate members and between the plate member 74 and the main body 61. The air layers formed in the interplate space 75 are arranged in a plurality of units in an imaginary plane that is orthogonal to the extension direction and intersects with the heating part 50, in a direction away from the heating part 50. Based on the above configuration, by arranging a plurality of air layers in an imaginary plane orthogonal to the extending direction and intersecting the heating section 50, in a direction away from the heating section 50, heat release from the heating section 50 to the outside can be suppressed. Furthermore, the air layers have relatively low thermal conductivity, thus providing sufficient insulation performance even with a small thickness. Moreover, at least a portion of the end of the inter-plate space 75 is sealed by the first sealing member 82 and the second sealing member 83, thereby suppressing the entry and exit of air into and out of the inter-plate space 75. This suppresses the generation of convection within the air layers. Consequently, it is difficult to cause heat movement between the two plate members constituting the inter-plate space 75, and between the plate member 74 and the main body 61 of the housing 60, further improving the insulation performance of the air layers. Therefore, power consumption can be reduced without increasing the size of the device. Furthermore, in the first heating device 13 of this embodiment, the inter-plate space 75 is sealed. With this configuration, since the inter-plate space 75 is sealed, the movement of air between the inside and outside of the inter-plate space 75 can be reliably suppressed. Therefore, the thermal insulation performance of the air layer can be further improved. Furthermore, in the first heating device 13 of this embodiment, each of the plate components 71, 72, 73, 74, and the upper wall 61a and two side walls 61b of the main body 61 extend along the extending direction. The first sealing member 82 is made of heat-insulating material and seals both ends of the inter-plate space 75 in the extending direction. According to this configuration, by sealing both ends of the inter-plate space 75 in a predetermined direction through the first sealing member 82, air can be prevented from entering or leaving from these ends. In addition, since the first sealing member 82 sealing both ends of the inter-plate space 75 in the extending direction is made of heat-insulating material, heat transfer between adjacent plate components and between the plate component 74 and the main body 61 of the box 60 via the first sealing member 82 can be suppressed. As a result, the heat insulation performance caused by the air layer can be further improved. Furthermore, in the first heating device 13 of this embodiment, the density of the first sealing member 82 is 80 kg / m³. 3 That's all. Based on this configuration, by making the first sealing member 82 high-density, it is possible to more reliably prevent air from entering and exiting the inter-plate space 75 via the first sealing member 82. Therefore, the inter-plate space 75 can be sealed more reliably. Furthermore, the first heating device 13 in this embodiment also includes a gasket member 81 disposed in each inter-plate space 75. When the thickness of the inter-plate space 75 is uneven, convection can easily occur in the air layer formed in the inter-plate space 75 due to the temperature difference generated therein. According to this configuration, by disposing of the gasket member 81 in the inter-plate space 75, the thickness of the inter-plate space 75 can be made uniform. Therefore, convection in the air layer can be suppressed, thereby further improving the thermal insulation performance caused by the air layer. Furthermore, in the first heating device 13 of this embodiment, the gasket members 81 disposed in two adjacent inter-plate spaces 75 are arranged at different positions in the extending direction. When the gasket members 81 disposed in the two adjacent inter-plate spaces 75 are arranged at the same position in the extending direction, heat can easily move between the plate members and between the plate members and the main body 61 of the housing 60 via these two gasket members 81. In this configuration, heat is less likely to move between the plate members and between the plate members and the main body 61 of the housing 60 via the two gasket members 81, further improving the thermal insulation performance caused by the air layer. Furthermore, in the first heating device 13 of this embodiment, the lower end of the inter-plate space 75a is sealed by bent portions 71c and 72c formed by bending the lower ends of the plate members 71 and 72 constituting the inter-plate space 75a. Additionally, the lower end of the inter-plate space 75c is sealed by bent portions 73c and 74c formed by bending the lower ends of the plate members 73 and 74 constituting the inter-plate space 75c. In two adjacent inter-plate spaces 75, the bent portions 71c, 72c, 73c, and 74c of one inter-plate space 75 (75a, 75c) and the gasket member 81 disposed in the other inter-plate space 75 (75b, 75d) are arranged at different positions in the vertical direction. According to this configuration, the inter-panel spaces 75a and 75c are sealed by the bending portions 71c, 72c, 73c, and 74c, which are part of the panel components 71, 72, 73, and 74, thereby sealing the inter-panel spaces 75a and 75c. Furthermore, heat is difficult to move between the panel components and between the panel components and the main body 61 of the housing 60 via the bending portions 71c, 72c, 73c, and 74c and the gasket component 81, further improving the thermal insulation performance caused by the air layer. Furthermore, in the first heating device 13 of this embodiment, the bent portions 71c and 72c function as spacers to ensure the spacing between the plate members 71 and 72. Additionally, the bent portions 73c and 74c function as spacers to ensure the spacing between the plate members 73 and 74. According to this configuration, the thickness of the inter-plate spaces 75a and 75c can be made uniform through the bent portions 71c, 72c, 73c, and 74c. Furthermore, in the first heating device 13 of this embodiment, the lower ends of the inter-plate spaces 75a and 75c are sealed by bending portions 71c, 72c, 73c, and 74c. The lower ends of the inter-plate spaces 75b and 75d are sealed by a second sealing member 83 made of heat-insulating material. When all adjacent inter-plate spaces 75 are sealed by bending portions, heat is sequentially transferred between the plurality of plate members via the bending portions sealing each inter-plate space 75. According to this configuration, the inter-plate spaces 75b and 75d are sealed by the second sealing member 83 made of heat-insulating material. Therefore, heat transfer between plate members 71 and 72 via bending portions 71c and 72c to plate member 73 can be suppressed. In addition, heat transfer between plate members 73 and 74 via bending portions 73c and 74c to the main body 61 of the box 60 can be suppressed. This allows for maintaining 75% airtightness between the panels and further improving the thermal insulation performance caused by the air layer. Furthermore, in the first heating device 13 of this embodiment, the vertical positions of the bending portions 71c and 72c of the sealing plate space 75a and the bending portions 73c and 74c of the sealing plate space 75c are different from each other. If the vertical positions of the bending portions 71c, 72c, 73c, and 74c of the sealing plate spaces 75a and 75c were the same, heat could potentially move between different plate components via these bending portions 71c, 72c, 73c, and 74c. In this configuration, heat is less likely to move between different plate components via the bending portions 71c, 72c, 73c, and 74c, further improving the thermal insulation performance caused by the air layer. Furthermore, in the first heating device 13 of this embodiment, the second sealing member 83 covers the surface of the bent portion 71c of the sealing plate space 75a opposite to the side of the plate space 75a, and the surface of the bent portion 73c of the sealing plate space 75c opposite to the side of the plate space 75c. With this configuration, heat release from the bent portions 71c and 73c can be suppressed through the second sealing member 83. In particular, heat release from the bent portion 71c of the plate member 71, which is located near the heating section 50 and thus becomes high-temperature, can be reliably suppressed. Furthermore, in the first heating device 13 of this embodiment, the second sealing member 83 also serves as a covering member, covering the surfaces of the bent portions 71c and 73c of the spaces 75a and 75c between the sealing plates. With this configuration, the structure of the first heating device 13 can be simplified compared to the case where the covering member is a different component from the second sealing member 83. Furthermore, in the first heating device 13 of this embodiment, the second sealing member 83 covers the lower ends of all inter-plate spaces 75b and 75d that are not sealed by the bent portions in the inter-plate space 75, and covers the lower surfaces of the bent portions 71c and 73c of all inter-plate spaces 75a and 75c that are sealed by the bent portions in the inter-plate space 75. With this configuration, it is possible to maintain the airtightness of all inter-plate spaces 75 through a single second sealing member 83, and further improve the thermal insulation performance caused by the air layer. Furthermore, in the first heating device 13 of this embodiment, the bent portions 71c and 72c of the sealing plate space 75a are located near the heating section 50 in the vertical direction, compared to the bent portions 73c and 74c of the sealing plate space 75c. Also, the vertical thicknesses Ta1 and Ta2 of the portion of the second sealing member 83 covering the bent portion 71c are greater than the vertical thicknesses Tb1 and Tb2 of the portion covering the bent portion 73c. ​​With this configuration, heat release from the bent portion 71c, which is located near the heating section 50 in the vertical direction and thus becomes high-temperature, can be reliably suppressed. Furthermore, in the first heating device 13 of this embodiment, plate members 71 and 72 are fixed to each other at bends 71c and 72c formed at their lower ends. Plate members 73 and 74 are fixed to each other at bends 73c and 74c formed at their lower ends. Plate members 72 and 73 are fixed to each other at their upper ends via connecting members 84. Plate member 74 and the main body 61 of the housing 60 are fixed to each other at their upper ends via connecting members 85. According to this configuration, the layer thickness between plate members 71 and 72 can be maintained by fixing the bends 71c and 72c to which plate members 71 and 72 are fixed. The layer thickness between plate members 73 and 74 can be maintained by fixing the bends 73c and 74c to which plate members 73 and 74 are fixed. Furthermore, the layer thickness between plate members 72 and 73 can be maintained by fixing the connecting members 84 to which plate members 72 and 73 are fixed. By using the connecting member 85 to fix the panel member 74 to the main body 61 of the housing 60, the layer thickness between the panel member 74 and the main body 61 of the housing 60 can be maintained. Here, when the fixing portions between the panel members and between the panel member 74 and the main body 61 of the housing 60 are arranged close to each other, heat can easily move between the panel members and between the panel members and the main body 61 of the housing 60 via these fixing portions. In this configuration, the fixing portions of the panel members 71 and 72 (the portions with bent portions 71c and 72c) and the fixing portions of the panel members 73 and 74 (the portions with bent portions 73c and 74c), the fixing portions of the panel members 72 and 73 (the portions connected by the connecting member 84), and the fixing portion of the panel member 74 and the main body 61 of the housing 60 (the portions connected by the connecting member 85) can be separated in the vertical direction. Therefore, heat is less likely to move between the panel members and between the panel members and the main body 61 of the housing 60 via the fixing portions, and the thermal insulation performance caused by the air layer can be further improved. Furthermore, in the first heating device 13 of this embodiment, the second sealing member 83 is made of heat-insulating material and seals the lower ends of the spaces 75b and 75d between the sealing plates. With this configuration, by sealing the lower ends of the spaces 75b and 75d between the sealing members 83, air can be prevented from entering or exiting from these ends. In addition, since the second sealing member 83 is made of heat-insulating material, heat transfer via the second sealing member 83 between adjacent plate members 72 and 73, and between plate member 74 and the main body 61 of the housing 60, can be suppressed. Therefore, the heat insulation performance caused by the air layer can be further improved. Furthermore, in the first heating device 13 of this embodiment, the density of the second sealing member 83 is 80 kg / m³. 3 That's all. Based on this configuration, by making the second sealing member 83 high-density, it is possible to more reliably prevent air from entering and exiting the inter-plate spaces 75b and 75d via the second sealing member 83 on the inside and outside. Therefore, the inter-plate spaces 75b and 75d can be sealed more reliably. Furthermore, in the first heating device 13 of this embodiment, the thickness of the air layer is 5 mm or more and less than 15 mm. If the thickness of the air layer is large, convection is more likely to occur. If convection occurs in the air layer, heat movement is likely to occur between the two plate members constituting the inter-plate space 75 where the air layer is formed, and between the plate member 74 and the main body 61 of the box 60. On the other hand, if the thickness of the air layer is small, adjacent plate members may come into contact with each other, and between the plate member 74 and the main body 61 of the box 60. In this case, heat moves between adjacent plate members and between the plate member 74 and the main body 61 of the box 60 via the contact portion. According to this configuration, the thickness of the air layer can be formed to a size that can suppress convection in the air layer, and can be formed to a size that makes it difficult for the plate members to come into contact with each other, and between the plate member 74 and the main body 61 of the box 60. As a result, the heat insulation performance caused by the air layer can be further improved. Furthermore, the first heating device 13 of this embodiment also includes a heat insulation member 80, which is disposed between the plate member 71, which is closest to the heating part 50 among the plurality of plate members 71, 72, 73, and 74, and the heating part 50. Bolts 59 and the like, used to fix the components constituting the heating part 50, are exposed on the surface of the heating part 50, and its surface has unevenness. Therefore, it is difficult to form an air layer of uniform thickness and high heat insulation performance between the surface of the heating part 50 and the plate member 71. In this configuration, by disposing the heat insulation member 80 between the heating part 50 and the plate member 71, heat loss from the heating part 50 to the outside can be further suppressed. Furthermore, in the first heating device 13 of this embodiment, the thread travel groove 56 is defined by the heating unit 50. With this configuration, the thread Y can be heated efficiently. Furthermore, in the first heating device 13 of this embodiment, the thread travel groove 56 is open downwards, and the upper wall 61a and two side walls 61b of the four plate components 71, 72, 73, 74 and the main body 61 are not arranged in the area opposite to the lower end of the thread travel groove 56. According to this configuration, an area opposite to the lower end of the thread travel groove 56 that becomes the area through which the thread Y passes when it is inserted into the thread travel groove 56 can be left empty. Furthermore, in the first heating device 13 of this embodiment, each plate member 71 , 72 , 73 , 74 is a slot type extending along an extension direction and open in a downward direction. The plurality of plate members 71 , 72 , 73 , 74 as well as the upper wall 61a and two side walls 61b of the main body portion 61 are configured in a nested shape, while the innermost plate member 71 is configured to surround the heating portion 50 . According to the configuration, it is capable of vacating the area in which the thread passes when thread Y is inserted into the thread travel slot 56 , and it is capable of surrounding the heating portion 50 by forming an air layer between two adjacent sheets of plate assembly, between the plate member 74 and the main portion 61 in the interplate space 75 . Thus, it is able to effectively suppress heat release from the heating portion 50 to the outside. Further, in the first heating apparatus 13 of this embodiment, the opposite surfaces of the two plate components 71 , 72 located closest to the interplate space 75a of the heating portion 50 constituting the four interplate spaces 75 are mirror polished. According to the configuration, the radiant heat from the heating portion 50 is able to be suppressed through the mirror surface of the plate components 71 , 72 . Thus, it is able to suppress heat transfer due to radiation, further cutting power consumption. In addition, the cost increases if mirror polishing is performed on the surfaces of multiple plate components. In the present configuration, the radiative heat from the heating portion 50 is suppressed most effectively by performing a mirror polishing of the surface demarcated in the interplate space 75a closest to the heating portion 50 . Furthermore, the dirt on the surface polished by the mirror can easily become obvious. In the present configuration, the dirt attached to the mirror surface is difficult to notice since the surface to the delineated interplate space 75a is not visible from the outside. Above, embodiments of the present invention are described based on the diagrams, but it should be understood that the specific formulations are not limited to these embodiments. The scope of the invention is not represented by the description of the above embodiments but by the scope of the applied patent, which in turn includes the implications of being equal to the scope of the applied patent and all changes within the scope. In the foregoing embodiments, a case of applying the present invention to a first heating device 13 of a dummy jig processing machine 1 is described, but the invention can also be applied to a second heating device 19 . The following, as an example of the above embodiment, is described for the application of the invention to a second heating device 19 . As described above, the second heating apparatus 19 is provided one each in a span. 9 and 10 , the second heating device 19 has a plurality of heating portions 150 . As shown in (b) of Figs. That is, in the present example, the up-down direction is equivalent to the "prescribed direction" of the invention. As shown in Figures 11(a) and (b), the heating unit 150 has a tube 151 extending in the vertical direction and two tubes 152a and 152b inserted into the tube 151. A heat transfer medium 154 is filled inside the tube 151. Furthermore, as shown in Figure 10, the upper ends of the tubes 151 of the plurality of heating units 150 are interconnected through a tube 153. The heat transfer medium 154 flows between the tubes 151 of the plurality of heating units 150 through the tube 153. The tubes 152a and 152b respectively serve as pathways for the threads Ya and Yb. The second heating device 19 is heated by the heat transfer medium 154, heating the air in the space inside the tubes 152a and 152b, and thus heating the threads Ya and Yb traveling inside the tubes 152a and 152b. As shown in Figures 9 and 10, a plurality of heating elements 150 are housed in a casing 160. Plate members 171, 172, 173, and 174 are disposed between the plurality of heating elements 150 and the inner wall of the casing 160. The main body 161 of the casing 160 and the plate members 171, 172, 173, and 174 all have a rectangular shape that is longer in the length direction of the casing in a cross section orthogonal to the vertical direction. The main body 161 of the casing 160 corresponds to the "plate member" of the present invention. Plate components 171, 172, 173, and 174 are arranged opposite each other and separately. Plate components 171, 172, 173, and 174 are arranged in an imaginary plane (e.g., the plane of the paper in FIG9) that is orthogonal to the vertical direction and intersects the heating element 150, in a direction away from the heating element 150. The innermost plate component 171 surrounds a plurality of heating elements 150. Inter-plate spaces 175a, 175b, and 175c are formed between two opposing plate components. Furthermore, an inter-plate space 175d is formed between plate component 174 and main body 161. Air layers are formed in each of these four inter-plate spaces 175a, 175b, 175c, and 175d (175). That is, in an imaginary plane (e.g., the plane of FIG9) orthogonal to the vertical direction and intersecting the heating element 150, four air layers formed in each inter-plate space 175 are arranged in a direction away from the heating element 150. As shown in Figure 10, the upper end of the inter-plate space 175 is sealed by sealing member 182. Furthermore, the lower end of the inter-plate space 175 is sealed by sealing member 183. Sealing members 182 and 183 correspond to the "first sealing member" of this invention. Only one of sealing member 182 or sealing member 183 needs to be provided. Sealing member 182 may also seal at least one of a plurality of inter-plate spaces 175a, 175b, 175c, and 175d. Sealing member 183 may also seal at least one of a plurality of inter-plate spaces 175a, 175b, 175c, and 175d. In this second heating device 19, similar to the first heating device 13 in the above embodiment, power consumption can be reduced without making the device larger. Furthermore, in the above embodiment, the case where the two ends of the inter-plate space 75 extending in the direction of extension are sealed by the first sealing member 82, and the lower end of the inter-plate space 75 is sealed by the second sealing member 83, has been described, but it is not limited to this. The first heating device 13 may only have either the first sealing member 82 or the second sealing member 83. The first heating device 13 may only have a sealing member that seals at least a portion of the end of the inter-plate space 75. Furthermore, in the above embodiment, the case where all inter-plate spaces 75 are sealed has been described. However, the inter-plate spaces 75 do not necessarily have to be sealed. Alternatively, only a portion of the multiple inter-plate spaces 75 may be sealed. Furthermore, in the above embodiment, the case where the first sealing member 82, made of thermal insulation material, seals both ends of the inter-plate space 75 in the extending direction has been described, but this is not a limitation. The first sealing member 82 may also seal only one end of the inter-plate space 75 in the extending direction. Additionally, the first sealing member 82 may seal at least one of a plurality of inter-plate spaces 75a, 75b, 75c, and 75d. The first sealing member 82 may also not be made of thermal insulation material. Furthermore, in the above embodiment, the case where a plurality of gasket members 81 are arranged in each inter-board space 75 has been described, but this is not a limitation. One gasket member 81 may also be arranged in each inter-board space 75. The gasket member 81 may also be arranged only in a portion of the plurality of inter-board spaces 75. Alternatively, no gasket member 81 may be arranged in any inter-board space 75. Furthermore, in the above embodiment, the case where the gasket members 81 respectively disposed in two adjacent inter-plate spaces 75 are arranged at different positions in the extending direction has been described. However, the gasket members 81 respectively disposed in two adjacent inter-plate spaces 75 may also be arranged at the same position in the extending direction. Furthermore, in the above embodiment, the bending portions 71c, 72c, 73c, and 74c of one of the adjacent inter-plate spaces 75 (75a, 75c) and the gasket member 81 disposed in the other inter-plate space 75 (75b, 75d) were described as being disposed in different positions in the vertical direction. However, the bending portions 71c, 72c, 73c, and 74c and the gasket member 81 disposed in the inter-plate spaces 75b and 75d may also be disposed in the same position in the vertical direction. Furthermore, in the above embodiment, the lower ends of the inter-plate spaces 75a and 75c are sealed by bends 71c, 72c, 73c, and 74c, and the lower ends of the inter-plate spaces 75b and 75d are sealed by a second sealing member 83 made of thermal insulation material. However, this is not a limitation. For example, bends may not be formed, and the lower ends of all inter-plate spaces 75 may be sealed by the second sealing member 83. Furthermore, bends may not be formed, and at least one of the plurality of inter-plate spaces 75, 75a, 75b, 75c, and 75d may be sealed by the second sealing member 83. Furthermore, the second sealing member 83 may also be made of thermal insulation material. Furthermore, in the above embodiment, the case where a second sealing member 83 seals the lower end of the inter-plate spaces 75b and 75d and covers the surfaces of the bent portions 71c and 73c of the inter-plate spaces 75a and 75c has been described, but this is not a limitation. That is, for example, the component sealing the lower end of the inter-plate spaces 75b and 75d and the component covering the surfaces of the bent portions 71c and 73c of the inter-plate spaces 75a and 75c may be different components. Furthermore, only the surface of the bent portion 71c of the inter-plate space 75a closest to the heating unit 50 within the inter-plate spaces sealed by the bent portions (i.e., inter-plate spaces 75a and 75c) may be covered by the second sealing member 83, which is made of heat-insulating material. The surfaces of both sides of the bent portions 71c and 73c of the inter-plate spaces 75a and 75c may not be covered by the second sealing member 83, which is made of heat-insulating material. Furthermore, in the above embodiment, the vertical positions of the bent portions 71c and 72c of the sealing plate space 75a and the bent portions 73c and 74c of the sealing plate space 75c are described as different. However, the vertical positions of the bent portions 71c and 72c and the bent portions 73c and 74c can also be the same. Furthermore, in the above embodiment, the case where the thicknesses Ta1 and Ta2 of the portion of the second sealing member 83 covering the bent portion 71c in the vertical direction are greater than the thicknesses Tb1 and Tb2 of the portion covering the bent portion 73c in the vertical direction has been described. However, the thicknesses Ta1 and Ta2 may also be less than or equal to Tb1 and Tb2. Furthermore, in the above embodiment, the plate components 72 and 73 are fixed to each other via connecting members 84 on the upper walls 72a and 73a, and the plate component 74 and the main body 61 of the box 60 are fixed to each other via connecting members 85 on the upper walls 74a and 61a. The fixing portions of the plate components 72 and 73 (the portions connected via connecting members 84) and the fixing portions of the plate component 74 and the main body 61 of the box 60 (the portions connected via connecting members 85) are not limited to the upper ends of each component; for example, they may also be the lower ends. Furthermore, in the above embodiment, the case where a heat insulation member 80 is arranged between the plate member 71 and the heating part 50 has been described, but the heat insulation member 80 may not be arranged. Furthermore, in the above embodiment, the case where four plate members 71, 72, 73, and 74 are arranged between the main body 61 and the heating part 50 of the box 60, and four inter-plate spaces 75 are formed between the plate members 71, 72, 73, and 74 and the main body 61 has been described, but this is not a limitation. It is sufficient that at least two inter-plate spaces 75 are formed. In other words, at least three members corresponding to the plate members of the present invention are sufficient. Five or more inter-plate spaces 75 may also be formed. Furthermore, in the above embodiment, the case where the four plate members 71, 72, 73, 74, as well as the upper wall 61a and two side walls 61b of the main body 61, are not arranged in the area opposite to the lower end of the thread travel groove 56 has been described, but this is not a limitation. That is, plate members constituting the inter-plate space may also be arranged in the area opposite to the lower end of the thread travel groove 56. In this case, the plate members arranged in the area opposite to the lower end of the thread travel groove 56 are configured to be movable from that area or detachable relative to the device. Furthermore, in the above embodiments, the case where each plate component 71, 72, 73, and 74 is a groove-shaped component extending along the extension direction and opening in the downward direction has been described, but this is not a limitation. That is, for example, the plate component may also be a flat plate that is not bent. Furthermore, in the above embodiment, the opposing surfaces of the two plate members 71 and 72 that constitute the inter-plate space 75 closest to the heating part 50 are described as being mirror-polished, but this is not a limitation. Preferably, at least the surface of the plate member 71 that defines the inter-plate space 75a closest to the heating part 50 among the opposing surfaces of the two plate members 71 and 72 is mirror-polished. The surfaces of all plate members 71 to 74 and the main body 61 may also be mirror-polished. The surfaces of plate members 71 to 74 and the main body 61 may also not be mirror-polished. Furthermore, in the above embodiment, the case where the entire yarn travel groove 56 is formed in the heating section 50 has been described, but it is not limited to this. That is, for example, the heating section 50 may also define only a portion of the yarn travel groove 56. In other words, the heating section 50 may define only the bottom of the yarn travel groove 56. In addition, for example, the heating section 50 may define only the side portion of the yarn travel groove 56. Furthermore, in the above embodiment, the case where the yarn Y contacts the receiving surface 55 in the heating section 50 and receives heat from the heating block 52 via the receiving surface 55 has been described, but it is not limited to this. The heating section 50 may also be a non-contact method that uses heated air to heat the yarn Y. Furthermore, in the foregoing embodiments, the situation where the heating portion 50 has a heat source 51 as well as a heating block 52 heated by the heat source 51 is described, but not limited to this. For example, the heating portion may also be a configuration that circulates a thermal medium such as a Dowtherm within a hollow part. Further, in the foregoing embodiments, the situation in which the thread heating apparatus of the present invention is applied to, but not limited to, a dummy machining machine 1 that performs dummy processing on strand Y. The yarn heating apparatus of the present invention is not limited to pseudo-pin processing, but may also be applicable to processing machines that implement various processing such as merging processing on yarns composed of synthetic fibers. 1: False jib processing machine 2: Thread supply section 3: Processing section 4: Coiling section 5: Cylinder frame 8: Main body 9: Retracting table 10: Support frame 11: First supply roller 12: Stopper thread guide 13: First heating device (wire heating device) 18: 3rd supply roller 19: 2nd heating device (wire heating device) 20: 4th supply roller 21: winding device 31: fulcrum thread guide 32: horizontal moving device 33: rocking frame 34: horizontal moving thread guide 35: contact roller 50: heating section 51: heat source 5 6: thread 0 through box 61: Main body 62: Door 68: Opening 78: Plywood 80: Thermal insulation component 81: Gasket component 82: First sealing component (sealing component) 83: Second sealing component (sealing component, cladding component) 161: body part (plate part) 152, 152a, 152b: tube 171, 172, 173, 174: plate part 175, 175a, 175b, 175c, 175d: interplate space 182, 183: sealed part 52, 52a, 553b 54, 54a, 54b: Joint section 55, 55a: Joint surface 61a: upper wall (plate part) 61b, 61c: side wall (plate part) 61d: lower wall 61d1: first part 61d2: second part 62a: shaft 71, 72, 73, 77a, 727a, 727a 71b, 72b, 73b, 74b: sidewall 71c, 72c: fold (first fold) 73c, 74c: fold (second fold) 75, 75a, 75b, 75c, 75d: space between plates 84, 85: connecting parts Bw: for winding tubing 1: imaginary center line spool s Pw: reel rolls Y, Ya, Yb: thread 1] is a side view of a dummy machine processing machine according to one embodiment of the present invention. [Figure 2] is a schematic diagram of the dummy dick processing machine unfolding along the path of the thread. [Figure 3] is a diagram representing the first heating apparatus. [Figure 4] is a cross-sectional view along the lines IV-IV of the first heating device shown in FIG. (a) of [Figure 5] is an enlarged view of the heating part shown in Figure 4, and (b) is a cross-sectional view along the bb line of the heating part shown in (a). [Figure 6] is a cross-sectional view along the lines VI-VI of the first heating apparatus shown in FIG. [Figure 7] is a cross-sectional view along the lines VII-VII of the first heating apparatus shown in FIG. [Fig.8] is a diagram used to illustrate the dimensions, a cross-sectional view along the lines IV-IV of the first heating apparatus shown in FIG. [FIG.9] is a diagram for illustrating a deformation example with respect to embodiments, a cross-sectional view of a face sectioned orthogonal to the up-down direction of the second heating device. [Figure 10] is a cross-sectional view along the XX line of FIG. (a) of [Figure 11] is an enlarged view of the heating part shown in Figure 9, and (b) is a cross-sectional view along the bb line of (a). 13: First Heating Device (Wire Heating Device) 50: Heating section 59: Bolt 60: Box 61: main body 61a: upper wall (plate component) 61b: Sidewall (Plate Parts) 61d: Lower wall 61d1: Part One 61d2: Part 2 62: Door 62a: axis 68: Opening 71,72,73,74: Plate components 71a, 72a, 73a, 74a: upper wall 71b, 72b, 73b, 74b: sidewall 71c, 72c: Bend (first bend) 71d: Protrusion 73c, 74c: Bend (second bend) 75, 75a, 75b, 75c, 75d: interplate space 78: Plywood 80: Thermal insulation components 81: Pad components 83: Second sealing part (sealing part, covering part) 84,85: Connecting components 91: Insulation block 92: Insulation Block 93: Insulation Block P1: Imaginary plane P2: Imaginary plane

Claims

1. A wire heating device forming a wire travel path, characterized in that it comprises: a heating section extending along a predetermined direction of the wire travel path to heat the wire traveling in the wire travel path; a plurality of plate members arranged opposite each other and separately in an imaginary plane orthogonal to the predetermined direction and intersecting the heating section, arranged in a direction away from the heating section; and a sealing member sealing at least a portion of the end of the space between two opposing plate members; wherein... In the aforementioned hypothetical plane, a plurality of air layers formed in the aforementioned interplate space are arranged in a direction away from the aforementioned heating part.

2. The wire heating device as claimed in claim 1, wherein, The space between the aforementioned panels was sealed.

3. The wire heating device as claimed in claim 1, wherein, Each of the aforementioned plate components extends along the aforementioned specified direction; the aforementioned sealing component includes a first sealing component, which is made of thermal insulation material and respectively seals both ends of the aforementioned space between the plates in the aforementioned specified direction.

4. The wire heating device as claimed in claim 2, wherein, Each of the aforementioned plate components extends along the aforementioned specified direction; the aforementioned sealing component includes a first sealing component, which is made of thermal insulation material and respectively seals both ends of the aforementioned space between the plates in the aforementioned specified direction.

5. The wire heating device as claimed in claim 3, wherein, The density of the aforementioned first sealing component is above 80 kg / m3.

6. The wire heating device as claimed in claim 1 further includes a gasket component disposed in the space between the aforementioned plates.

7. The wire heating device as claimed in claim 2 further includes a gasket component disposed in the space between the aforementioned plates.

8. The wire heating device as claimed in claim 3 further includes a gasket component disposed in the space between the aforementioned plates.

9. The wire heating device as claimed in claim 6, wherein, The aforementioned gasket components, which are respectively disposed in two adjacent spaces between the aforementioned plates, are disposed at different positions in the aforementioned specified direction.

10. The wire heating device as claimed in claim 7, wherein, The aforementioned gasket components, which are respectively disposed in two adjacent spaces between the aforementioned plates, are disposed at different positions in the aforementioned specified direction.

11. The wire heating device as claimed in claim 8, wherein, The aforementioned gasket components, which are respectively disposed in two adjacent spaces between the aforementioned plates, are disposed at different positions in the aforementioned specified direction.

12. The wire heating device as claimed in claim 6, wherein, At least one end of the aforementioned inter-plate space in an orthogonal direction orthogonal to the aforementioned defined direction is sealed by a bend, which is formed by bending the ends of the two aforementioned plate components constituting the inter-plate space in the aforementioned orthogonal direction in the aforementioned one side; in two adjacent inter-plate spaces, the aforementioned bend that seals one of the aforementioned inter-plate spaces and the aforementioned gasket component disposed in the other inter-plate space are disposed at different positions in the aforementioned orthogonal direction.

13. The wire heating device as claimed in claim 7, wherein, At least one end of the aforementioned inter-plate space in an orthogonal direction orthogonal to the aforementioned defined direction is sealed by a bend, which is formed by bending the ends of the two aforementioned plate components constituting the inter-plate space in the aforementioned orthogonal direction in the aforementioned one side; in two adjacent inter-plate spaces, the aforementioned bend that seals one of the aforementioned inter-plate spaces and the aforementioned gasket component disposed in the other inter-plate space are disposed at different positions in the aforementioned orthogonal direction.

14. The wire heating device as claimed in claim 8, wherein, At least one end of the aforementioned inter-plate space in an orthogonal direction orthogonal to the aforementioned defined direction is sealed by a bend, which is formed by bending the ends of the two aforementioned plate components constituting the inter-plate space in the aforementioned orthogonal direction in the aforementioned one side; in two adjacent inter-plate spaces, the aforementioned bend that seals one of the aforementioned inter-plate spaces and the aforementioned gasket component disposed in the other inter-plate space are disposed at different positions in the aforementioned orthogonal direction.

15. The wire heating device as claimed in claim 12, wherein, The aforementioned bend serves as a spacer to ensure the spacing between the two plate components.

16. The wire heating device as claimed in claim 13, wherein, The aforementioned bend serves as a spacer to ensure the spacing between the two plate components.

17. The wire heating device as claimed in claim 14, wherein, The aforementioned bend serves as a spacer to ensure the spacing between the two plate components.

18. The wire heating device as claimed in claim 12, wherein, When three adjacent plate components among the aforementioned plurality of plate components are designated as a first plate component, a second plate component, and a third plate component; the end of one side of the orthogonal direction of the inter-plate space between the first plate component and the second plate component is sealed by a bend formed by bending the ends of the first plate component and the second plate component in the orthogonal direction; the sealing component includes a second sealing component, which is made of heat insulation material, and seals the end of the inter-plate space between the second plate component and the third plate component in the orthogonal direction.

19. The wire heating device as claimed in claim 13, wherein, When three adjacent plate components among the aforementioned plurality of plate components are designated as a first plate component, a second plate component, and a third plate component; the end of one side of the orthogonal direction of the inter-plate space between the first plate component and the second plate component is sealed by a bend formed by bending the ends of the first plate component and the second plate component in the orthogonal direction; the sealing component includes a second sealing component, which is made of heat insulation material, and seals the end of the inter-plate space between the second plate component and the third plate component in the orthogonal direction.

20. The wire heating device as claimed in claim 14, wherein, When three adjacent plate components among the aforementioned plurality of plate components are designated as a first plate component, a second plate component, and a third plate component; the end of one side of the orthogonal direction of the inter-plate space between the first plate component and the second plate component is sealed by a bend formed by bending the ends of the first plate component and the second plate component in the orthogonal direction; the sealing component includes a second sealing component, which is made of heat insulation material, and seals the end of the inter-plate space between the second plate component and the third plate component in the orthogonal direction.

21. The wire heating device as claimed in claim 18, wherein, When the two aforementioned inter-plate spaces, the one closest to the aforementioned heating element and the one furthest from the aforementioned heating element, are sealed by the aforementioned bending portion, the aforementioned bending portions that seal the aforementioned two inter-plate spaces are located at different positions in the aforementioned orthogonal directions.

22. The wire heating device as claimed in claim 19, wherein, When the two aforementioned inter-plate spaces, the one closest to the aforementioned heating element and the one furthest from the aforementioned heating element, are sealed by the aforementioned bending portion, the aforementioned bending portions that seal the aforementioned two inter-plate spaces are located at different positions in the aforementioned orthogonal directions.

23. The wire heating device as claimed in claim 20, wherein, When the two aforementioned inter-plate spaces, the one closest to the aforementioned heating element and the one furthest from the aforementioned heating element, are sealed by the aforementioned bending portion, the aforementioned bending portions that seal the aforementioned two inter-plate spaces are located at different positions in the aforementioned orthogonal directions.

24. The wire heating device as claimed in claim 18 further comprises a covering member made of heat-insulating material, which covers the surface of the inter-plate space sealed by the aforementioned bend, which is the opposite side of the inter-plate space side of the aforementioned bend that seals at least the inter-plate space closest to the aforementioned heating part.

25. The wire heating device as claimed in claim 19 further comprises a covering member made of heat-insulating material, which covers the surface of the inter-plate space sealed by the aforementioned bend, which is the opposite side of the inter-plate space side of the aforementioned bend that seals at least the inter-plate space closest to the aforementioned heating part.

26. The wire heating device as claimed in claim 20 further comprises a covering member made of heat-insulating material, which covers the surface of the inter-plate space sealed by the aforementioned bend portion that is opposite to the inter-plate space side of the aforementioned bend portion that seals at least the inter-plate space closest to the aforementioned heating portion.

27. The wire heating device as claimed in claim 24, wherein, The aforementioned second sealing component also serves as the aforementioned covering component.

28. The wire heating device as claimed in claim 25, wherein, The aforementioned second sealing component also serves as the aforementioned covering component.

29. The wire heating device as claimed in claim 26, wherein, The aforementioned second sealing component also serves as the aforementioned covering component.

30. The wire heating device as claimed in claim 27, wherein, The aforementioned second sealing component seals the end of one side of the aforementioned orthogonal direction of all inter-plate spaces that are not sealed by the aforementioned bending portion, and covers the surface of the aforementioned bending portion of all inter-plate spaces that are sealed by the aforementioned bending portion that is opposite to the aforementioned inter-plate space side.

31. The wire heating device as claimed in claim 28, wherein, The aforementioned second sealing component seals the end of one side of the aforementioned orthogonal direction of all inter-plate spaces that are not sealed by the aforementioned bending portion, and covers the surface of the aforementioned bending portion of all inter-plate spaces that are sealed by the aforementioned bending portion that is opposite to the aforementioned inter-plate space side.

32. The wire heating device as claimed in claim 29, wherein, The aforementioned second sealing component seals the end of one side of the aforementioned orthogonal direction of all inter-plate spaces that are not sealed by the aforementioned bending portion, and covers the surface of the aforementioned bending portion of all inter-plate spaces that are sealed by the aforementioned bending portion that is opposite to the aforementioned inter-plate space side.

33. The wire heating device as claimed in claim 27, wherein, Each of the aforementioned plate components covers the entirety of the aforementioned heating portion in the aforementioned orthogonal direction; the aforementioned bending portion, which is located in the aforementioned inter-plate space that is sealed by the aforementioned bending portion and is closest to the aforementioned heating portion, is located closer to the aforementioned heating portion in the aforementioned orthogonal direction compared to the aforementioned bending portions, which seal the other aforementioned inter-plate spaces, namely the second bending portions; the thickness of the portion of the aforementioned second sealing component covering the aforementioned first bending portion in the aforementioned orthogonal direction is greater than the thickness of the portion covering the aforementioned second bending portion in the aforementioned orthogonal direction.

34. The wire heating device as claimed in claim 28, wherein, Each of the aforementioned plate components covers the entirety of the aforementioned heating portion in the aforementioned orthogonal direction; the aforementioned bending portion, which is located in the aforementioned inter-plate space that is sealed by the aforementioned bending portion and is closest to the aforementioned heating portion, is located closer to the aforementioned heating portion in the aforementioned orthogonal direction compared to the aforementioned bending portions, which seal the other aforementioned inter-plate spaces, namely the second bending portions; the thickness of the portion of the aforementioned second sealing component covering the aforementioned first bending portion in the aforementioned orthogonal direction is greater than the thickness of the portion covering the aforementioned second bending portion in the aforementioned orthogonal direction.

35. The wire heating device as claimed in claim 29, wherein, Each of the aforementioned plate components covers the entirety of the aforementioned heating portion in the aforementioned orthogonal direction; the aforementioned bending portion, which is located in the aforementioned inter-plate space that is sealed by the aforementioned bending portion and is closest to the aforementioned heating portion, is located closer to the aforementioned heating portion in the aforementioned orthogonal direction compared to the aforementioned bending portions, which seal the other aforementioned inter-plate spaces, namely the second bending portions; the thickness of the portion of the aforementioned second sealing component covering the aforementioned first bending portion in the aforementioned orthogonal direction is greater than the thickness of the portion covering the aforementioned second bending portion in the aforementioned orthogonal direction.

36. The wire heating apparatus as described in any one of claims 18 to 35, further comprising a connecting member that connects the aforementioned plate members to each other; wherein, The aforementioned first plate component and the aforementioned second plate component are fixed to each other at the aforementioned bend; the aforementioned second plate component and the aforementioned third plate component are fixed to each other at their ends on the opposite side of the aforementioned one side of the orthogonal direction by the aforementioned connecting component.

37. The wire heating apparatus as claimed in any one of claims 1 to 17, wherein, The aforementioned sealing component includes a second sealing component, which is made of thermal insulation material and seals one end of the aforementioned inter-plate space in an orthogonal direction that is orthogonal to the aforementioned specified direction.

38. The wire heating apparatus as claimed in any one of claims 18 to 35, wherein, The density of the aforementioned second sealing component is above 80 kg / m3.

39. The wire heating device as claimed in any one of claims 1 to 35, wherein, The aforementioned air layer has a thickness of 5 mm or more but less than 15 mm.

40. The wire heating device as claimed in claim 36, wherein, The aforementioned air layer has a thickness of 5 mm or more but less than 15 mm.

41. The wire heating device as claimed in claim 37, wherein, The aforementioned air layer has a thickness of 5 mm or more but less than 15 mm.

42. The wire heating device according to any one of claims 1 to 35 further comprises a heat insulation member disposed among the aforementioned plurality of plate members, the plate member being closest to the aforementioned heating part between the aforementioned heating part and the aforementioned heating part.

43. The wire heating device as claimed in claim 36 further comprises a heat insulation member disposed among the plurality of plate members in such a way that the plate member closest to the heating part is positioned between the heating part and the heating part.

44. The wire heating device as claimed in claim 37 further comprises a heat insulation member disposed among the plurality of plate members in a position closest to the aforementioned heating part between the aforementioned plate member and the aforementioned heating part.

45. The wire heating device as claimed in claim 39 further comprises a heat insulation member disposed among the plurality of plate members in such a way that the plate member closest to the heating part is positioned between the heating part and the heating part.

46. ​​The wire heating device as claimed in any one of claims 1 to 35, wherein, The aforementioned thread travel path is a thread travel groove, at least a portion of which is defined by the aforementioned heating unit and opens in an open direction orthogonal to the aforementioned defined direction.

47. The wire heating device as claimed in claim 36, wherein, The aforementioned thread travel path is a thread travel groove, at least a portion of which is defined by the aforementioned heating unit and opens in an open direction orthogonal to the aforementioned defined direction.

48. The wire heating device as claimed in claim 37, wherein, The aforementioned thread travel path is a thread travel groove, at least a portion of which is defined by the aforementioned heating unit and opens in an open direction orthogonal to the aforementioned defined direction.

49. The wire heating device as claimed in claim 39, wherein, The aforementioned thread travel path is a thread travel groove, at least a portion of which is defined by the aforementioned heating unit and opens in an open direction orthogonal to the aforementioned defined direction.

50. The wire heating device as claimed in claim 42, wherein, The aforementioned thread travel path is a thread travel groove, at least a portion of which is defined by the aforementioned heating unit and opens in an open direction orthogonal to the aforementioned defined direction.

51. The wire heating device as claimed in claim 45, wherein, The aforementioned thread travel path is a thread travel groove, at least a portion of which is defined by the aforementioned heating unit and opens in an open direction orthogonal to the aforementioned defined direction.

52. The wire heating device as claimed in claim 46, wherein, The aforementioned plurality of plate components are not configured in the area opposite to the open end of the aforementioned open direction in the aforementioned wire travel groove.

53. The wire heating device as claimed in claim 49, wherein, The aforementioned plurality of plate components are not configured in the area opposite to the open end of the aforementioned open direction in the aforementioned wire travel groove.

54. The wire heating device as claimed in claim 50, wherein, The aforementioned plurality of plate components are not configured in the area opposite to the open end of the aforementioned open direction in the aforementioned wire travel groove.

55. The wire heating device as claimed in claim 51, wherein, The aforementioned plurality of plate components are not configured in the area opposite to the open end of the aforementioned open direction in the aforementioned wire travel groove.

56. The wire heating device as claimed in claim 52, wherein, Each of the aforementioned plate components extends along the aforementioned specified direction and is a slot-shaped structure that opens in the aforementioned open direction; the aforementioned plurality of plate components are arranged in a nested manner, with the innermost plate component arranged to surround the aforementioned heating part.

57. The wire heating device as claimed in claim 53, wherein, Each of the aforementioned plate components extends along the aforementioned specified direction and is a slot-shaped structure that opens in the aforementioned open direction; the aforementioned plurality of plate components are arranged in a nested manner, with the innermost plate component arranged to surround the aforementioned heating part.

58. The wire heating device as claimed in claim 54, wherein, Each of the aforementioned plate components extends along the aforementioned specified direction and is a slot-shaped structure that opens in the aforementioned open direction; the aforementioned plurality of plate components are arranged in a nested manner, with the innermost plate component arranged to surround the aforementioned heating part.

59. The wire heating device as claimed in claim 55, wherein, Each of the aforementioned plate components extends along the aforementioned specified direction and is a slot-shaped structure that opens in the aforementioned open direction; the aforementioned plurality of plate components are arranged in a nested manner, with the innermost plate component arranged to surround the aforementioned heating part.

60. The wire heating device as claimed in any one of claims 1 to 35, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

61. The wire heating device as claimed in claim 36, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

62. The wire heating device as claimed in claim 37, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

63. The wire heating device as claimed in claim 39, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

64. The wire heating device as claimed in claim 42, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

65. The wire heating device as claimed in claim 45, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

66. The wire heating device as claimed in claim 46, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

67. The wire heating device as claimed in claim 49, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

68. The wire heating device as claimed in claim 50, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

69. The wire heating device as claimed in claim 51, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

70. The wire heating device as claimed in claim 52, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

71. The wire heating device as claimed in claim 53, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

72. The wire heating device as claimed in claim 54, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

73. The wire heating device as claimed in claim 55, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

74. The wire heating device as claimed in claim 56, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

75. The wire heating device as claimed in claim 57, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

76. The wire heating device as claimed in claim 58, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

77. The wire heating device as claimed in claim 59, wherein, The surfaces of the two plate members that are closest to the heating element in the aforementioned inter-plate spaces that constitute the aforementioned plurality of inter-plate spaces are mirror polished.

78. A dimple processing machine that performs dummy processing of a thread, characterized by: having a thread heating apparatus as described in any one of claims 1 to 77 .

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