Spun yarn stretching apparatus

Abstract

To suppress yarn swing and an increase in power consumption in a spun yarn stretching apparatus.SOLUTION: A spun yarn stretching apparatus 3 includes three or more heating rollers 31 and a thermal insulation box 13 housing the heating rollers 31. A yarn Y is wound onto the three or more heating rollers 31 at a winding angle of less than 360 degrees, and the heating rollers are configured to heat and send the yarn Y to a downstream side in a yarn running direction. The three or more heating rollers 31 include a first heating roller 32, a second heating roller 33, and a third heating roller 34. The thermal insulation box 13 includes a circulator 50 which is provided around the second heating roller 33 and which is configured to cause a roller accompanied flow generated by rotation of the second heating roller 33 to circulate around the entire second heating roller 33 in a circumferential direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a spinning and drawing apparatus. [Background technology]

[0002] Patent Document 1 discloses a spinning and drawing device for drawing polyester yarn spun from a spinning device. More specifically, the spinning and drawing device has a plurality of godet rollers around which the traveling yarn is wound, and a heat-insulating box that houses the plurality of godet rollers. The plurality of godet rollers include a plurality of preheating rollers for preheating the yarn, and a plurality of tempering rollers that are provided downstream of the preheating rollers in the yarn traveling direction and have a higher surface temperature than the preheating rollers. In such a spinning and drawing device, the yarn is drawn between the preheating rollers and the tempering rollers. In addition, a blocking member is provided near the tempering rollers to prevent the accompanying flow generated by the rotation of the tempering rollers from escaping from the heat-insulating box. This improves the heat-insulating effect and suppresses an increase in the power consumption of the heater that heats the godet rollers.

[0003] Although not disclosed in Patent Document 1, a spinning and drawing apparatus for drawing nylon yarn has been conventionally known. A conventional spinning and drawing apparatus for nylon has a plurality of known Nelson rollers. In many of the spinning and drawing apparatus for nylon, the plurality of Nelson rollers include a non-heated roller that is not heated and a heated roller for heat setting that is arranged downstream of the non-heated roller in the yarn running direction. In such a spinning and drawing apparatus, the yarn is drawn between the non-heated roller and the heated roller. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-131898 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a conventional spinning and drawing device for drawing nylon yarn, in order to enhance the heating effect of the Nelson roller, the yarn is wound around the Nelson roller many times while shifting the position in the axial direction of the Nelson roller. Therefore, an axial force is applied to the yarn wound around the Nelson roller, which is likely to cause the problem of yarn swaying. In addition, in a spinning and drawing device capable of drawing nylon yarn, it is also required to reduce the power consumption of the heater.

[0006] An object of the present invention is to suppress an increase in power consumption while suppressing yarn swaying in a spinning and drawing device. [Means for solving the problem]

[0007] A spinning and drawing device of a first invention is a spinning and drawing device that draws a traveling yarn spun from a spinning device, and includes three or more heating rollers around which the yarn is wound at a winding angle of less than 360 degrees and which are configured to heat the yarn and send it downstream in a yarn running direction, and a heat retention box that houses the three or more heating rollers, and the three or more heating rollers include an uppermost heating roller that is disposed most upstream in the yarn running direction among the three or more heating rollers, and a lowermost heating roller that is disposed most downstream in the yarn running direction among the three or more heating rollers. the heat retaining box has one or more circulation units arranged around one or more predetermined upstream heating rollers among two or more upstream heating rollers including the most upstream heating roller and the one or more intermediate heating rollers, and configured to circulate a roller accompanying flow, which is an accompanying flow generated by rotation of each of the one or more predetermined upstream heating rollers, around the entire circumference of each of the one or more predetermined upstream heating rollers. The one or more predetermined upstream heating rollers include the one or more intermediate heating rollers, and the one or more circulation units are provided corresponding to all of the one or more intermediate heating rollers. It is characterized by:

[0008] In the present invention, since three or more heating rollers are provided, the yarn can be sufficiently heated without using a Nelson roller, which is likely to cause yarn swaying. Therefore, yarn swaying can be suppressed compared to a configuration in which a Nelson roller is provided. Furthermore, in the present invention, the roller-accompanying flow is circulated around the predetermined upstream heating roller by the circulation unit, so that the gas heated by the predetermined upstream heating roller can be prevented from escaping from the heat-insulating box through the yarn outlet. This improves the heat-insulating effect in the heat-insulating box. In addition, the roller-accompanying flow is circulated by the circulation unit, so that the gas forming the roller-accompanying flow can be continuously heated by the predetermined upstream heating roller. This improves the heat-insulating effect in the vicinity of the predetermined upstream heating roller, and as a result, the heat-insulating effect of the predetermined upstream heating roller itself can be improved. Therefore, in the spinning and drawing device, it is possible to suppress an increase in power consumption while suppressing yarn swaying.

[0009] In addition, when the yarn enters the insulation box through an entrance formed in the insulation box, an accompanying flow generated by the traveling yarn (hereinafter, referred to as the yarn accompanying flow) also flows into the insulation box. The most upstream heating roller is easily cooled by such cold air flowing in from outside the insulation box. Since the intermediate heating roller is relatively close to the most upstream heating roller, the heat generated from the intermediate heating roller can be transferred to the most upstream heating roller by improving the heat retention effect of the intermediate heating roller. This also improves the heat retention effect of the most upstream heating roller.

[0010] Furthermore, in the present invention, the heat retention effect within the heat retention box can be effectively improved.

[0011] The spinning and drawing apparatus of the second invention is characterized in that, in a cross section perpendicular to the rotation axis direction of a predetermined heating roller corresponding to the predetermined circulation part among the one or more predetermined upstream heating rollers, a predetermined circulation part that is any one of the one or more circulation parts is arranged to face a non-contact surface of the outer circumferential surface with which the yarn is not in contact, when a contact start point is defined as a contact start point and a contact end point is defined as a contact end point. The predetermined circulation part is also arranged between an upstream yarn path that is a yarn path upstream of the contact start point in the yarn running direction and a downstream yarn path that is a yarn path downstream of the contact end point in the yarn running direction in the yarn running direction, in a cross section perpendicular to the rotation axis direction of the predetermined heating roller corresponding to the predetermined circulation part among the one or more predetermined upstream heating rollers.

[0012] In the present invention, the roller-accompanying flow recovery surface can prevent the roller-accompanying flow from escaping to the outside in the radial direction of the outer circumferential surface due to centrifugal force, and therefore the roller-accompanying flow can be effectively circulated with a simple configuration.

[0013] The spinning and drawing apparatus of the third invention is characterized in that, in the second invention, an angle formed by a first virtual line segment that is a virtual line segment connecting the first point and the second point, and a second virtual line segment that is a virtual line segment connecting the center in the radial direction of the specified heating roller and the first point, is an acute angle.

[0014] In the present invention, the roller-accompanying flow flowing near the first point can be guided radially inward while being received in the circumferential direction by the roller-accompanying flow recovery surface, thereby allowing the roller-accompanying flow to flow smoothly along the roller-accompanying flow recovery surface.

[0015] The fiber drawing apparatus of the fourth invention is characterized in that, in the second or third invention, the shortest distance between the outer circumferential surface and the entrained flow recovery surface in the cross section is 11 mm or more and 88 mm or less.

[0016] If the distance between the outer peripheral surface and the accompanying flow recovery surface is too narrow, the amount of circulating roller-accompanying flow is reduced. On the other hand, if the distance between the outer peripheral surface and the accompanying flow recovery surface is too wide, the roller-accompanying flow is not easily prevented from escaping radially outward due to centrifugal force, which makes it easier for airflow turbulence to occur. Airflow turbulence can cause yarn breakage. In the present invention, these problems can be further suppressed by setting the shortest distance between the outer peripheral surface and the accompanying flow recovery surface to 11 mm or more and 88 mm or less.

[0017] A spinning and drawing device of a fifth invention is a spinning and drawing device that draws a traveling yarn spun from a spinning device, the spinning and drawing device comprising: three or more heating rollers around which the yarn is wound at a winding angle of less than 360 degrees and which are configured to heat the yarn and send it downstream in a yarn running direction; and a heat retention box that houses the three or more heating rollers, the three or more heating rollers including an upstream heating roller that is disposed most upstream in the yarn running direction among the three or more heating rollers, a downstream heating roller that is disposed most downstream in the yarn running direction among the three or more heating rollers, and one or more intermediate heating rollers that are disposed downstream of the upstream heating roller and upstream of the downstream heating roller in the yarn running direction, the heat retention box is disposed around one or more predetermined upstream heating rollers among two or more upstream heating rollers including the upstream heating roller and the one or more intermediate heating rollers, and is configured to circulate a roller accompanying flow, which is an accompanying flow generated by rotation of each of the one or more predetermined upstream heating rollers, around the entire circumference of each of the one or more predetermined upstream heating rollers. a contact start point is defined as a contact start point, and a contact end point is defined as a contact end point, in a cross section perpendicular to a rotation axis direction of a predetermined heating roller corresponding to the predetermined circulation part among the one or more predetermined upstream heating rollers, where the upstream-most point in the yarn running direction of a contact surface of the outer circumferential surface of the predetermined heating roller with which the yarn is in contact is defined as a contact start point, and a downstream-most point in the yarn running direction of the contact surface is defined as a contact end point, the predetermined circulation part being any one of the one or more predetermined upstream heating rollers, is disposed to face a non-contact surface of the outer circumferential surface with which the yarn is not in contact, and the heating roller has an accompanied flow recovery surface that is arranged so as to be sandwiched between an upstream yarn path that is a yarn path upstream of the contact start point in the yarn running direction and a downstream yarn path that is a yarn path downstream of the contact end point in the yarn running direction in the circumferential direction of the specified heating roller, and includes a first point that is an end point closest to the contact end point in the circumferential direction and a second point that is an end point closest to the contact start point in the circumferential direction, and in the cross section, the shortest distance between the outer circumferential surface and the accompanied flow recovery surface is 11 mm or more and 88 mm or less.

[0018] If the distance between the outer peripheral surface and the accompanying flow recovery surface is too narrow, the amount of circulating roller-accompanying flow is reduced. On the other hand, if the distance between the outer peripheral surface and the accompanying flow recovery surface is too wide, the roller-accompanying flow is not easily prevented from escaping radially outward due to centrifugal force, which makes it easier for airflow turbulence to occur. Airflow turbulence can cause yarn breakage. In the present invention, these problems can be further suppressed by setting the shortest distance between the outer peripheral surface and the accompanying flow recovery surface to 11 mm or more and 88 mm or less.

[0019] The spinning and drawing apparatus of the sixth invention is characterized in that, in the fifth invention, an angle formed by a first virtual line segment that is a virtual line segment connecting the first point and the second point, and a second virtual line segment that is a virtual line segment connecting the center in the radial direction of the specified heating roller and the first point, is an acute angle.

[0020] In the present invention, the roller-accompanying flow flowing near the first point can be guided radially inward while being received in the circumferential direction by the roller-accompanying flow recovery surface, thereby allowing the roller-accompanying flow to flow smoothly along the roller-accompanying flow recovery surface.

[0021] A seventh aspect of the present invention is the fiber drawing apparatus according to the fifth or sixth aspect of the present invention, characterized in that the one or more predetermined upstream heating rollers include the one or more intermediate heating rollers.

[0022] When the yarn enters the insulation box through an entrance formed in the insulation box, an accompanying flow generated by the traveling yarn (hereinafter referred to as the yarn accompanying flow) also flows into the insulation box. The most upstream heating roller is easily cooled by such cold air flowing in from outside the insulation box. Since the intermediate heating roller is relatively close to the most upstream heating roller, by improving the heat retention effect of the intermediate heating roller, the heat generated from the intermediate heating roller can be transferred to the most upstream heating roller. This also improves the heat retention effect of the most upstream heating roller.

[0023] A spinning and drawing device according to an eighth aspect of the present invention is a spinning and drawing device that draws a traveling yarn spun from a spinning device, and includes three or more heating rollers around which the yarn is wound at a winding angle of less than 360 degrees and which are configured to heat the yarn and send it downstream in a yarn running direction, and a heat retention box that houses the three or more heating rollers, and the three or more heating rollers include an upstream heating roller that is disposed most upstream in the yarn running direction among the three or more heating rollers, and a downstream heating roller that is disposed most downstream in the yarn running direction among the three or more heating rollers. and one or more intermediate heating rollers arranged downstream of the most upstream heating roller and upstream of the most downstream heating roller in the yarn running direction, the heat-retaining box has one or more circulation units arranged around one or more predetermined upstream heating rollers among two or more upstream heating rollers including the most upstream heating roller and the one or more intermediate heating rollers, and configured to circulate a roller accompanying flow, which is an accompanying flow generated by rotation of each of the one or more predetermined upstream heating rollers, around the entire circumference of each of the one or more predetermined upstream heating rollers, When a contact start point is defined as a contact start point, and a downstream point in the yarn running direction of the contact surface of the outer circumferential surface of the predetermined heating roller that corresponds to the predetermined circulation part among the one or more predetermined upstream heating rollers, the upstream point in the yarn running direction of the contact surface of the outer circumferential surface of the predetermined heating roller that is in contact with the yarn is defined as a contact end point, the predetermined circulation part is disposed to face a non-contact surface of the outer circumferential surface with which the yarn is not in contact, and is located further away in the yarn running direction than the contact start point in the circumferential direction of the predetermined heating roller. the heating roller has an entrained flow recovery surface that is arranged so as to be sandwiched between an upstream yarn path that is an upstream yarn path and a downstream yarn path that is a yarn path that is downstream in the yarn running direction from the contact end point, and includes a first point that is an end point closest to the contact end point in the circumferential direction and a second point that is an end point closest to the contact start point in the circumferential direction, and is characterized in that, in the cross section, an angle formed by a first virtual line segment that is a virtual line segment connecting the first point and the second point and a second virtual line segment that is a virtual line segment connecting the center of the specified heating roller in the radial direction and the first point is an acute angle.

[0024] In the present invention, the roller-accompanying flow flowing near the first point can be guided radially inward while being received in the circumferential direction by the roller-accompanying flow recovery surface, thereby allowing the roller-accompanying flow to flow smoothly along the roller-accompanying flow recovery surface.

[0025] The spinning and drawing apparatus of a ninth aspect of the present invention is the apparatus of the eighth aspect of the present invention, characterized in that the one or more predetermined upstream heating rollers include the one or more intermediate heating rollers.

[0026] When the yarn enters the insulation box through an entrance formed in the insulation box, an accompanying flow generated by the traveling yarn (hereinafter referred to as the yarn accompanying flow) also flows into the insulation box. The most upstream heating roller is easily cooled by such cold air flowing in from outside the insulation box. Since the intermediate heating roller is relatively close to the most upstream heating roller, by improving the heat retention effect of the intermediate heating roller, the heat generated from the intermediate heating roller can be transferred to the most upstream heating roller. This also improves the heat retention effect of the most upstream heating roller.

[0027] No. 10 The spinning and drawing apparatus of the present invention is Any of 2 to 9 In the invention, in the cross section, a virtual upstream straight line that includes the contact start point and partially overlaps with the upstream yarn path, and a virtual downstream straight line that includes the contact end point and partially overlaps with the downstream yarn path are linearly symmetrical with respect to a predetermined axis of symmetry, and the first point is arranged so as to be sandwiched between the axis of symmetry and the virtual downstream straight line.

[0028] In the present invention, the first point is located near the contact end point. This makes it easier for the accompanying flow collecting surface to capture (collect) the accompanying flow that flows near the contact end point. Therefore, the roller accompanying flow can be circulated effectively.

[0029] No. 11 The spinning and drawing apparatus of the present invention is 2 ~ 10 In any of the above-mentioned inventions, in the cross section, the accompanying flow recovery surface forms a line segment connecting the first point and the second point, or is curved or bent to form an obtuse angle so as to bulge outward in the radial direction of the specified heating roller beyond the line segment.

[0030] In the present invention, the roller-accompanying flow can be made to flow smoothly along the accompanying flow recovery surface.

[0031] No. 12 The spinning and drawing apparatus of the present invention is 11 In the invention, the accompanying flow recovery surface is characterized in that it forms the line segment in the cross section.

[0032] In the present invention, the accompanying flow recovery surface is flat, and therefore the accompanying flow recovery surface can be formed by simple processing, compared to when the accompanying flow recovery surface is curved or bent.

[0033] No. 13 The spinning and drawing apparatus of the present invention is 2 ~ 12 In any one of the above-mentioned inventions, the predetermined circulation portion has an accompanying flow restriction surface arranged so as to surround the contact surface in the circumferential direction.

[0034] In the present invention, the accompanying flow regulating surface can further suppress the roller accompanying flow from escaping to the outside in the radial direction of the outer circumferential surface due to centrifugal force.

[0035] No. 14 The spinning and drawing apparatus of the present invention is 13 In the invention, an imaginary half line having the first point as an end point and passing through the second point in the cross section intersects with the accompanying flow regulating surface.

[0036] In the present invention, the roller-accompanying flow guided along the roller-accompanying flow recovery surface can be supplied toward the roller-accompanying flow regulating surface, thereby making it possible to circulate the roller-accompanying flow more effectively.

[0037] No. 15 The spinning and drawing apparatus of the present invention is 2 ~ 14In any one of the inventions above, when an intersection point of an imaginary half line, having the first point as an end point and passing through the second point, and a yarn path of the yarn running toward the contact start point is defined as a third point, an angle formed by a third virtual line segment, which is a virtual line segment connecting the second point and the third point, and a fourth virtual line segment, which is a virtual line segment connecting the third point and the contact start point, is an obtuse angle in the cross section.

[0038] In the present invention, the roller-accompanying flow guided along the accompanying flow recovery surface can be prevented from flowing against the traveling direction of the yarn, thereby suppressing yarn swaying.

[0039] The spinning and drawing device of the 16th invention is characterized in that, in any one of the first to fifteenth inventions, the one or more circulation sections are configured to circulate the roller-accompanying flow around each of the one or more predetermined upstream heating rollers, thereby generating a laminar flow along the yarn running direction around each of the one or more predetermined upstream heating rollers.

[0040] In the present invention, a stable laminar flow can be formed by the roller-accompanying flow circulating around the predetermined upstream heating roller, so that yarn swaying can be suppressed even if the flow rate of the circulating gas is large.

[0041] No. 17 The spinning and drawing apparatus of the present invention is 16 In any one of the above-mentioned inventions, the heat-retaining box has a partition portion disposed between the downstream heating roller, which is a predetermined one of the most downstream heating roller and the one or more intermediate heating rollers, and the most upstream heating roller. ,before a downstream space on the downstream heating roller side from the partition portion; ,before The heat roller is heated by heating the heat exchanger and the heat exchanger is heated by heating the heat exchanger.

[0042] The most upstream heating roller is easily cooled by the cold air flowing in from the yarn inlet formed in the heat-retaining box. In the present invention, the hot gas in the downstream space can be supplied to the upstream space through the return flow path. This allows the most upstream heating roller to be cooled by the cold air flowing in from the yarn inlet formed in the heat-retaining box. Protection The heating effect can be effectively improved.

[0043] No. 18 The spinning and drawing apparatus of the present invention is 17 In any one of the above-mentioned inventions, the one or more predetermined upstream heating rollers include the most upstream heating roller.

[0044] In the present invention, the heat retention effect of the most upstream heating roller can be improved, and power consumption can be effectively reduced.

[0045] No. 19 The spinning and drawing apparatus of the present invention is 18 In any of the above-mentioned inventions, the thermal insulation box is characterized by having an outlet for the yarn, and a blocking section extending toward the most downstream contact surface of the outer circumferential surface of the most downstream heating roller around which the yarn is wound, for blocking a yarn-accompanying flow generated by the yarn traveling toward the outlet.

[0046] In the present invention, the blocking section can prevent the yarn-accompanying flow from flowing out of the thermal insulation box through the outlet, thereby improving the thermal insulation effect in the thermal insulation box.

[0047] No. 20 The spinning and drawing apparatus of the present invention is 19 In the invention, the heat-retaining box is arranged, in a cross section perpendicular to the rotation axis direction of the most downstream heating roller, to face a most downstream non-contact surface of the outer circumferential surface of the most downstream heating roller on which the yarn is not wound, and is characterized in having a most downstream accompanying flow recovery surface arranged to be sandwiched between a yarn path upstream of the most downstream contact surface in the yarn running direction and a yarn path downstream of the most downstream contact surface in the yarn running direction.

[0048] In the present invention, a part of the roller-accompanying flow of the most downstream heating roller can be returned to the upstream side in the yarn running direction by the most downstream accompanying flow recovery surface. This makes it possible to prevent the roller-accompanying flow from flowing out of the heat-insulating box through the outlet. Therefore, the heat-insulating effect in the heat-insulating box can be improved.

[0049] No. 21 The spinning and drawing apparatus of the present invention is 20 In any one of the above-mentioned inventions, the yarn is stretched upstream of the most upstream heating roller in the yarn running direction.

[0050] In the present invention, three or more heating rollers are provided downstream in the yarn running direction from the region where the yarn is drawn, so that the yarn can be firmly gripped. This makes it possible to prevent the yarn on the heating rollers from slipping due to tension applied to the drawn yarn, thereby further suppressing yarn swaying.

[0051] No. 22 The spinning and drawing apparatus of the present invention is 21 The invention is characterized in that it further comprises an outer roller, which is arranged outside the heat-retaining box and upstream of the three or more heating rollers in the yarn running direction, around which the yarn is wound before being drawn, and the yarn is drawn between the outer roller and the most upstream heating roller in the yarn running direction.

[0052] In the present invention, the heat-retaining box can suppress the transfer of heat between the outer roller and the most upstream heating roller, and therefore, even if there is a large difference in heating temperature between the outer roller and the most upstream heating roller, the influence of the temperature difference can be suppressed.

[0053] No. 23 The spinning and drawing apparatus of the present invention is 22 In the invention, the outer roller is a non-heating roller that does not heat the yarn.

[0054] In the present invention, the outer roller is a non-heated roller and does not need to be heated. Therefore, there is no need to house the outer roller in the heat-retaining box. Therefore, the inside of the heat-retaining box can be designed more freely than in a configuration in which a heat-retaining box may house a heat-retaining box having a different temperature setting from the three or more heat rollers.

[0055] No. 24 The spinning and drawing apparatus of the present invention is 23 In any one of the above-mentioned inventions, each of the three or more heating rollers is a heat setting roller for heat setting the drawn yarn.

[0056] In the present invention, since three or more heat setting rollers are provided, the yarn can be sufficiently heat set without using a Nelson roller, which is likely to cause yarn swaying.

[0057] No. 25 The spinning and drawing apparatus of the present invention is 24 In any one of the above-mentioned inventions, the thread is made of nylon.

[0058] The present invention is particularly useful in drawing nylon yarns. [Brief description of the drawings]

[0059] [Figure 1] FIG. 2 is a schematic diagram showing a spinning take-off machine including the spinning drawing device of the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of a spinning / drawing device. [Diagram 3] 1A and 1B are enlarged views of the second heating roller and its vicinity. [Figure 4] FIG. 13 is a diagram showing a simulation result of the flow rate of a fluid in an insulation box. [Diagram 5] 1 is a table showing conditions for fluid analysis in examples and comparative examples, and results of the fluid analysis under each condition. [Figure 6] The fluid analysis conditions and analysis results in Examples 1 to 6 are extracted from the table shown in FIG. 5 and rearranged. [Figure 7] The conditions and analysis results of the examples and comparative examples regarding the presence or absence of a return flow path are excerpted from the table shown in FIG. [Figure 8] 13(a) and 13(b) are explanatory diagrams according to a comparative example. [Figure 9] FIG. 11 is a cross-sectional view of a fiber drawing device according to a modified example. [Figure 10] FIG. 11 is a cross-sectional view of a fiber drawing apparatus according to another modified example. [Figure 11] 13 is a table including conditions for fluid analysis in a number of modified examples and results of the fluid analysis under each condition. [Figure 12]13A and 13B are enlarged views of a second heating roller and its vicinity according to still another modified example. [Figure 13] 13(a) and 13(b) are schematic diagrams of a fiber drawing apparatus according to still another modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0060] Next, an embodiment of the present invention will be described. The up-down direction, left-right direction, and front-rear direction shown in Fig. 1 are defined as the up-down direction, left-right direction, and front-rear direction of the yarn take-off machine 1, respectively. The up-down direction (up-down direction on the paper surface of Fig. 1) is a direction parallel to the vertical direction in which gravity acts. The left-right direction (left-right direction on the paper surface of Fig. 1) is a predetermined direction perpendicular to the up-down direction. The front-rear direction (direction perpendicular to the paper surface of Fig. 1) is a direction perpendicular to both the up-down direction and the left-right direction. In addition, the direction in which the yarn Y described below runs is defined as the yarn running direction.

[0061] (Yarn take-off machine) The configuration of a spinning take-off machine 1 equipped with a spinning drawing device 3 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram of the spinning take-off machine 1. The spinning take-off machine 1 is configured to draw a plurality of yarns Y spun from a spinning device 2 by a spinning drawing device 3, and then wind the yarns by a yarn winding device 4.

[0062] The spinning device 2 is configured to continuously spin a molten polymer made of nylon (e.g., nylon 6 or nylon 66) to produce multiple nylon yarns Y. Note that only one yarn Y is shown in FIG. 1. Each yarn Y is, for example, a multifilament yarn having multiple filaments f. Alternatively, each yarn Y may be composed of a single filament f. The multiple yarns Y spun from the spinning device 2 are fed with oil by an oil guide 10 and then sent to the spinning and drawing device 3.

[0063] The spinning and drawing device 3 is a device that draws multiple yarns Y. The spinning and drawing device 3 is disposed, for example, below the spinning device 2. As shown in FIG. 1, the spinning and drawing device 3 has, for example, a non-heated roller group 11, a heated roller group 12, and a heat-retaining box 13. The yarn Y is drawn between a plurality of non-heated rollers 21 of the non-heated roller group 11 and a plurality of heated rollers 31 of the heated roller group 12. Each of the plurality of heated rollers 31 is a heat-setting roller for heat-setting the drawn yarn Y. The plurality of heated rollers 31 are housed in the heat-retaining box 13.

[0064] The thermal insulation box 13 has an inlet 13a and an outlet 13b. The inlet 13a is an opening formed for introducing the multiple yarns Y into the thermal insulation box 13. A part of an accompanying flow (hereinafter, referred to as a yarn accompanying flow) generated by the running of the multiple yarns Y flows into the thermal insulation box 13 through the inlet 13a. The outlet 13b is an opening formed for leading the multiple yarns Y that have been drawn and heated to the outside of the thermal insulation box 13. A part of the yarn accompanying flow flows out of the thermal insulation box 13 through the outlet 13b. Further details of the spinning and drawing device 3 will be described later.

[0065] The multiple yarns Y drawn by the spinning and drawing device 3 are sent to the yarn winding device 4 via a guide roller 14. The yarn winding device 4 is configured to wind the multiple yarns Y onto multiple winding bobbins Bw, respectively, to form multiple packages P.

[0066] The yarn take-off machine 1 having the above-described configuration performs a series of processes of spinning, drawing, and winding a plurality of yarns Y.

[0067] (Spinning and stretching equipment) Next, a more specific configuration of the spinning and drawing apparatus 3 will be described with reference to Figures 1 and 2. Figure 2 is a cross-sectional view of the spinning and drawing apparatus 3 taken along a plane perpendicular to the front-rear direction.

[0068] As described above, the spinning and drawing device 3 has, for example, a non-heated roller group 11, a heated roller group 12, and a heat-insulating box 13. The non-heated roller group 11 is configured to take up the multiple yarns Y to which an oil agent has been applied, and send the multiple yarns Y to the heated roller group 12 without heating them. Alternatively, a take-up roller (not shown) may be arranged between the oil agent guide 10 and the non-heated roller group 11 in the yarn running direction. As shown in FIG. 1 and FIG. 2, the non-heated roller group 11 has, for example, multiple non-heated rollers 21. The multiple non-heated rollers 21 are arranged outside the heat-insulating box 13. The multiple non-heated rollers 21 may be housed in a heat-insulating box (not shown) separate from the heat-insulating box 13. Each non-heated roller 21 is, for example, a known godet roller. Each non-heated roller 21 is rotated by a motor (not shown). The rotation axis direction of the multiple non-heated rollers 21 is, for example, approximately parallel to the front-rear direction. That is, the rotational axis directions of the non-heated rollers 21 are substantially parallel to each other. Each non-heated roller 21 has an outer peripheral surface 21a (see FIG. 1) around which the multiple yarns Y are wound. The multiple yarns Y are wound around the outer peripheral surface 21a in the rotational axis direction of each non-heated roller 21 in a line. The multiple yarns Y are wound around the multiple non-heated rollers 21 at a winding angle of less than 360 degrees, in order from the upstream side in the yarn running direction. In this embodiment, three non-heated rollers 21 are provided as the multiple non-heated rollers 21 (see FIG. 1). As the three non-heated rollers 21, a first non-heated roller 22, a second non-heated roller 23, and a third non-heated roller 24 (outer rollers of the present invention) are arranged in order from the upstream side in the yarn running direction. The number of non-heated rollers 21 is not limited to this.

[0069] The heating roller group 12 is configured to draw the multiple yarns Y between the non-heating roller group 11 and heat-set the drawn multiple yarns Y. As shown in FIG. 1 and FIG. 2, the heating roller group 12 has, for example, multiple heating rollers 31. The multiple heating rollers 31 are housed in a heat-insulating box 13. Like the non-heating roller 21, each heating roller 31 is, for example, a known godet roller. Each heating roller 31 is rotated by a motor (not shown). The rotation axis direction of the multiple heating rollers 31 is, for example, substantially parallel to the front-rear direction. That is, the rotation axis directions of the multiple heating rollers 31 are substantially parallel to each other and substantially parallel to the rotation axis directions of the multiple non-heating rollers 21. Each heating roller 31 has an outer peripheral surface 31a (see FIG. 2) around which the multiple yarns Y are wound. The multiple yarns Y are wound around the outer peripheral surface 31a in the rotation axis direction of each heating roller 31 in a line. Each heating roller 31 has a heater (not shown). The heater has, for example, a coil (not shown). The heater is configured to heat the outer circumferential surface 31a of the heating roller 31 by Joule heat when power is supplied to the coil. The heating temperatures of the heating rollers 31 (i.e., the set temperatures of the outer circumferential surfaces 31a of the heating rollers 31) are substantially equal to each other. The heating temperatures of the heating rollers 31 are, for example, 50 to 250°C. The yarns Y are wound around the heating rollers 31 at a winding angle of less than 360 degrees, in order from the upstream side in the yarn running direction. In this embodiment, three heating rollers 31 are provided as the plurality of heating rollers 31. As the three heating rollers 31, a first heating roller 32, a second heating roller 33, and a third heating roller 34 are arranged in order from the upstream side in the yarn running direction.

[0070] The first heating roller 32 (the most upstream heating roller and the upstream heating roller of the present invention) is disposed on the most upstream side in the yarn running direction among the multiple heating rollers 31. The first heating roller 32 is disposed, for example, on the lowest side among the multiple heating rollers 31. The first heating roller 32 is disposed immediately downstream of the third non-heated roller 24, which is disposed on the most downstream side among the multiple non-heated rollers 21, in the yarn running direction. The first heating roller 32 is configured to draw the yarn Y between the first heating roller 32 and the third non-heated roller 24. That is, the yarn sending speed by the first heating roller 32 is set to be faster than the yarn sending speed by the third non-heated roller 24. The yarn Y is drawn by the difference between the yarn sending speed by the first heating roller 32 and the yarn sending speed by the third non-heated roller 24. That is, in this embodiment, the yarn Y is drawn upstream of the first heating roller 32 in the yarn running direction.

[0071] The second heating roller 33 (upstream heating roller, specified upstream heating roller, specified heating roller, and intermediate heating roller of the present invention) is disposed downstream of the first heating roller 32 and upstream of the third heating roller 34 in the yarn running direction. The second heating roller 33 is disposed, for example, above and to the right of the first heating roller 32. The second heating roller 33 is disposed, for example, to the right of and slightly below the third heating roller 34. The yarn feeding speed by the second heating roller 33 is approximately equal to the yarn feeding speed by the first heating roller 32.

[0072] The third heating roller 34 (the downstream heating roller and the most downstream heating roller of the present invention) is disposed most downstream in the yarn running direction among the multiple heating rollers 31. The third heating roller 34 is disposed, for example, directly above the first heating roller 32. The third heating roller 34 is disposed, for example, to the left of and slightly above the second heating roller 33. The yarn feeding speed by the third heating roller 34 is, for example, approximately equal to the yarn feeding speed by the first heating roller 32 and the yarn feeding speed by the second heating roller 33. However, the yarn feeding speed by the third heating roller 34 is not limited to this.

[0073] The rotation directions of the first heating roller 32, the second heating roller 33, and the third heating roller 34 are, for example, as shown by the arrows in Fig. 2. More specifically, in a cross section perpendicular to the front-rear direction, the rotation direction of the first heating roller 32 is, for example, clockwise. In this cross section, the rotation direction of the second heating roller 33 is opposite to the rotation direction of the first heating roller 32 (i.e., counterclockwise). In this cross section, the rotation direction of the third heating roller 34 is opposite to the rotation direction of the second heating roller 33 and is the same as the rotation direction of the first heating roller 32 (i.e., clockwise).

[0074] The heat-insulating box 13 is a box for preventing heat from escaping to the outside from the multiple heating rollers 31. As shown in Fig. 2, the heat-insulating box 13 has a peripheral wall 41, a rear wall 42, flow straightening members 43-46, blocking members 47, 48, a return flow path 49, and a front door (not shown). The internal space of the heat-insulating box 13 contains gas (air) at a pressure approximately equal to the pressure of the gas (air) in the external space of the heat-insulating box 13.

[0075] The peripheral wall 41 is a wall-shaped member provided so as to surround the multiple heating rollers 31 in a cross section (see FIG. 2) perpendicular to the front-rear direction. The peripheral wall 41 has inner wall surfaces 41a-41h arranged so as to surround the multiple heating rollers 31. The inner wall surfaces 41a-41h extend, for example, along the front-rear direction (the direction perpendicular to the paper surface of FIG. 2).

[0076] A more specific example of the arrangement of the inner wall surfaces 41a to 41h is as follows. As shown in FIG. 2, the inner wall surface 41a is disposed on the right side of the first heating roller 32, faces the left side, and extends along the vertical direction. The inner wall surface 41a is disposed immediately above the entrance 13a. The inner wall surface 41b is disposed on the right side of the first heating roller 32, faces the left side, and extends along the vertical direction. The inner wall surface 41b is disposed immediately below the entrance 13a. The inner wall surface 41c is disposed below the first heating roller 32, faces upward, and extends along the horizontal direction. The right end of the inner wall surface 41c is connected to the lower end of the inner wall surface 41b. The inner wall surface 41d is disposed on the left side of the first heating roller 32 and the third heating roller 34, faces the right side, and extends along the vertical direction. The lower end of the inner wall surface 41d is connected to the left end of the inner wall surface 41c. The inner wall surface 41e is disposed to the right of the first heating roller 32 and below the second heating roller 33, facing upward, and extending along the left-right direction. The left end of the inner wall surface 41e is connected to the upper end of the inner wall surface 41a. The inner wall surface 41f is disposed to the right of the second heating roller 33, facing left, and extending along the up-down direction. The lower end of the inner wall surface 41f is connected to the right end of the inner wall surface 41e. The inner wall surface 41g is disposed above the second heating roller 33 and the third heating roller 34, facing downward, and extending along the left-right direction. The left end of the inner wall surface 41g is connected to the upper end of the inner wall surface 41d. The inner wall surface 41h is disposed to the right of the second heating roller 33, facing left, and extending along the up-down direction. The inner wall surface 41h is disposed immediately above the outlet 13b. The upper end of inner wall surface 41h is connected to the right end of inner wall surface 41g. The arrangement of inner wall surfaces 41a to 41h is not limited to the above.

[0077] The rear wall 42 (see FIG. 2) is a wall disposed on the rear side of the peripheral wall 41. The rear wall 42 is, for example, a plate-shaped member disposed approximately perpendicular to the front-rear direction. The rear wall 42 is connected to the rear ends of the inner wall surfaces 41a to 41h. A motor (not shown) that rotates each of the heating rollers 31 is fixed in position relative to the rear wall 42, for example.

[0078] The straightening members 43 to 46 (see FIG. 2) are members for straightening the air in the heat insulation box 13. More specifically, the straightening members 43 to 46 are members for mainly straightening the above-mentioned yarn accompanying flow and the accompanying flow generated by the rotation of each heating roller 31 (hereinafter, referred to as roller accompanying flow). The straightening members 43 to 46 are formed, for example, by sheet metal processing a plate-shaped member. Alternatively, at least one of the straightening members 43 to 46 may be formed, for example, by cutting a block-shaped member. The straightening members 43 to 46 extend, for example, along the front-rear direction (the direction perpendicular to the paper surface of FIG. 2). The straightening members 43 to 46 are fixed, for example, to the rear wall 42.

[0079] As shown in Fig. 2, the flow straightening member 43 is disposed so as to surround the left portion of the first heating roller 32. The flow straightening member 43 extends generally in the vertical direction. For example, the flow straightening member 43 is disposed above the inner wall surface 41c and is separated from the inner wall surface 41c in the vertical direction. For example, the flow straightening member 43 is disposed to the right of the inner wall surface 41d and is separated from the inner wall surface 41d in the horizontal direction. As a result, a return flow path 49 is formed between the flow straightening member 43 and the inner wall surface 41d.

[0080] As shown in FIG. 2, the flow straightening member 44 is disposed so as to mainly surround the lower portion of the second heating roller 33. The flow straightening member 44 extends generally in the left-right direction. For example, the flow straightening member 44 is disposed almost entirely on the upper side of the inner wall surface 41e. The left end of the flow straightening member 44 is provided with a blocking portion 44a extending to the vicinity of the outer circumferential surface 32a of the first heating roller 32. The blocking portion 44a extends toward a portion of the outer circumferential surface 32a on which the yarn Y is not wound. The blocking portion 44a is configured to block the roller-accompanying flow of the first heating roller 32, thereby suppressing the roller-accompanying flow from returning to the inlet 13a side. The right end of the flow straightening member 44 is connected to, for example, the lower portion of the inner wall surface 41f. The flow straightening member 44 forms an accompanying flow regulating surface 51 described later together with the inner wall surface 41f.

[0081] As shown in FIG. 2, the flow straightening member 45 is disposed so as to mainly surround the upper portion of the second heating roller 33. The flow straightening member 45 extends generally in the left-right direction. For example, the flow straightening member 45 is disposed above the second heating roller 33 and below the inner wall surface 41g in the vertical direction. At the left end of the flow straightening member 45, for example, a blocking portion 45a is provided that extends to the vicinity of the outer circumferential surface 34a of the third heating roller 34. The blocking portion 45a is configured to block the roller-accompanying flow of the third heating roller 34, thereby suppressing the roller-accompanying flow from returning to the second heating roller 33 side. The right end of the flow straightening member 45 is connected to, for example, the upper end of the inner wall surface 41f. The flow straightening member 45, together with the inner wall surface 41f and the flow straightening member 44, forms an accompanying flow regulating surface 51 described later.

[0082] 2, the flow straightening member 46 (partition portion of the present invention) is disposed so as to separate the first heating roller 32 and the third heating roller 34 in the vertical direction. The flow straightening member 46 extends generally in the left-right direction. For example, the flow straightening member 46 is disposed almost entirely above the first heating roller 32 and below the third heating roller 34 in the vertical direction (i.e., between the first heating roller 32 and the third heating roller 34). The flow straightening member 46 is disposed, for example, on the right side of the inner wall surface 41d and separated from the inner wall surface 41d in the left-right direction.

[0083] The blocking member 47 is configured to block a yarn-accompanying flow generated by the traveling of the yarn Y entering the thermal insulation box 13 through the inlet 13a. The blocking member 47 is, for example, a plate-shaped member. The blocking member 47 is, for example, fixed to the inner wall surface 41c and the back wall 42. The blocking member 47 extends in the circumferential direction of the outer circumferential surface 32a of the first heating roller 32 toward a portion of the outer circumferential surface 32a around which the yarn Y is wound.

[0084] The blocking member 48 (blocking section of the present invention) is configured to block the yarn accompanying flow and the roller accompanying flow of the third heating roller 34, thereby preventing the yarn accompanying flow and the roller accompanying flow from flowing out from the outlet 13b. The blocking member 48 is, for example, a plate-shaped member. The blocking member 48 is fixed, for example, to the inner wall surface 41d and the back wall 42. The blocking member 48 extends from an upper portion of the inner wall surface 41d toward a portion of the outer circumferential surface 34a of the third heating roller 34 around which the yarn Y is wound (the most downstream contact surface 34b).

[0085] The return flow path 49 is, for example, a flow path for returning the air near the third heating roller 34 to the vicinity of the first heating roller 32. , alignment A space on the third heating roller 34 side of the flow member 46 (a downstream space of the present invention) , alignment The flow straightening member 43 communicates with a space on the first heating roller 32 side (upstream space of the present invention) of the flow straightening member 46. An inlet 49a of the return flow path 49 is formed between the inner wall surface 41d and the left end of the flow straightening member 46. An outlet 49b of the return flow path 49 is formed between the lower end of the flow straightening member 43 and the inner wall surfaces 41c, 41d.

[0086] The front door (not shown) is a door for closing the front of the thermal insulation box 13. The front door is configured to come into contact with the front end surface of the peripheral wall 41. A small gap is formed between the front door and the multiple heating rollers 31.

[0087] Additionally, the heat-retaining box 13 has an exhaust port (not shown) for exhausting gas containing the mist of the oil applied to the yarn Y. The flow rate of the gas exhausted from the exhaust port is sufficiently smaller than the flow rate of the gas flowing in from the inlet 13a and the flow rate of the gas flowing out from the outlet 13b. Further explanation of the exhaust port will be omitted.

[0088] In the spinning and drawing device 3 as described above, it is required to suppress yarn sway and suppress an increase in the power consumption of the heater. As for yarn sway, as described above, the spinning and drawing device 3 has three heating rollers 31 (for example, godet rollers). Therefore, the nylon yarn Y can be sufficiently heated without using a known Nelson roller, which is likely to cause yarn sway. Therefore, yarn sway can be suppressed. In addition, the power consumption of the heater can be reduced, for example, by improving the heat retention effect in the heat-retaining box 13 and the heat retention effect of the multiple heating rollers 31. The heat retention effect in the heat-retaining box 13 and the heat retention effect of the multiple heating rollers 31 can be improved, for example, by suppressing the outflow of heat from the heat-retaining box 13 and / or the intrusion of cold air from the outside of the heat-retaining box 13. In order to reduce power consumption, the spinning and drawing device 3 has the following configuration.

[0089] (Detailed configuration of the spinning and drawing device) The detailed configuration of the spinning and drawing device 3 will be described with reference to Figs. 3(a) and 3(b). Figs. 3(a) and 3(b) are enlarged views of the second heating roller 33 and its vicinity. Hereinafter, the rotation axis direction of the second heating roller 33 will be simply referred to as the rotation axis direction. The radial direction of the second heating roller 33 will be simply referred to as the radial direction. The circumferential direction of the second heating roller 33 will be simply referred to as the circumferential direction. Of the outer peripheral surface 33a of the second heating roller 33, the portion with which the yarn Y is in contact in a cross section perpendicular to the rotation axis direction (see Figs. 3(a) and 3(b) (hereinafter, the cross section) is called a contact surface 33b (see the thick line in Fig. 3(a)). In the cross section, the portion of the outer peripheral surface 33a with which the yarn Y is not in contact will be called a non-contact surface 33c (see the thick line in Fig. 3(b)). In the cross section, the most upstream point of the contact surface 33b in the yarn running direction is called a contact start point PS (see Fig. 3(b)). a In the above cross section, the most downstream point of the contact surface 33b in the yarn running direction is called the contact end point PE (see FIG. 3( a ) The path through which the thread Y passes is called the thread guide.

[0090] Next, a configuration for improving the heat retention effect in the heat retention box 13 will be described. As shown in Fig. 3(a), a circulation section 50 (a predetermined circulation section of the present invention) for circulating the roller accompanying flow of the second heating roller 33 around the second heating roller 33 is provided near the second heating roller 33. The circulation section 50 is formed, for example, by the inner wall surface 41f of the peripheral wall 41 and the flow straightening members 44, 45 and 46. The circulation section 50 has, for example, an accompanying flow regulating surface 51 (see the thick line in Fig. 3(a)) and an accompanying flow collecting surface 52 (see the thick line in Fig. 3(b)).

[0091] The accompany flow regulating surface 51 is a surface for suppressing the roller accompany flow flowing near the contact surface 33b from flowing outward in the radial direction. The accompany flow regulating surface 51 is formed by, for example, the inner wall surface 41f and the flow straightening members 44 and 45. The accompany flow regulating surface 51 is disposed, for example, on the radial outside of the contact surface 33b and disposed so as to surround the contact surface 33b in the circumferential direction. "Surrounding the contact surface 33b" means that the accompany flow regulating surface 51 extends over the same range as the contact surface 33b or over a wider range than the contact surface 33b in the circumferential direction. In other words, the accompany flow regulating surface 51 extends at least from one end position to the other end position of the contact surface 33b in the circumferential direction. The accompany flow regulating surface 51 prevents, for example, the roller accompany flow from flowing toward the outlet 13b (see FIG. 2).

[0092] The accompanying flow recovery surface 52 is a surface for guiding the roller accompanying flow flowing near the non-contact surface 33c in the circumferential direction and returning (in other words, recovering) the roller accompanying flow to the upstream side in the yarn running direction. The accompanying flow recovery surface 52 is formed by, for example, the straightening member 46. More specifically, a guide portion 46a having, for example, a substantially triangular shape in the above cross section is formed at the right end portion of the straightening member 46. The accompanying flow recovery surface 52 is the surface of the guide portion 46a that is closest to the non-contact surface 33c in the radial direction. The accompanying flow recovery surface 52 faces the non-contact surface 33c in the above cross section. The accompanying flow recovery surface 52 is disposed apart from the accompanying flow regulating surface 51 in the circumferential direction. More specifically, the non-contact surface 33c is disposed so as to be sandwiched between a yarn path upstream of the contact start point PS in the yarn running direction (hereinafter referred to as the upstream yarn path) and a yarn path downstream of the contact end point PE in the yarn running direction (hereinafter referred to as the downstream yarn path). The entrained flow collection surface 52 is straight (approximately linear) in the above cross section.

[0093] A more detailed example of the accompanied flow collection surface 52 will be described with reference to Figures 3(a) and 3(b). In the above cross section, the point on the accompanied flow collection surface 52 that is closest to the contact end point PE in the circumferential direction is defined as a first point P1. Similarly, the point on the accompanied flow collection surface 52 that is closest to the contact start point PS in the circumferential direction is defined as a second point P2. In the above cross section, the accompanied flow collection surface 52 forms a substantially straight line segment L1 (see the thick line in Figure 3(b)) that connects the first point P1 and the second point P2. In general, a line segment is a straight line that has both ends.

[0094] Hereinafter, lines and the like included in a surface formed by a component will be referred to simply as "lines" and the like, and lines and the like that can be virtually drawn independently of the component will be referred to as "virtual lines".

[0095] As shown in FIG. 3(a), in the above cross section, a virtual straight line including the contact start point PS and partially overlapping with the upstream yarn path is defined as a virtual upstream straight line VLu. In the above cross section, a virtual straight line including the contact end point PE and partially overlapping with the downstream yarn path is defined as a virtual downstream straight line VLd. In the above cross section, the center in the radial direction of the second heating roller 33 is called a center point PC. In the above cross section, the virtual upstream straight line VLu and the virtual downstream straight line VLd are symmetrical with each other with respect to a predetermined symmetric axis VLs passing through the center point PC, for example. The first point P1 is disposed so as to be sandwiched between the symmetric axis VLs and the virtual downstream straight line VLd in the above cross section.

[0096] 3(b), a virtual line segment connecting the first point P1 and the second point P2 in the above cross section is defined as a first virtual line segment VL1. In this embodiment, the first virtual line segment VL1 overlaps with the line segment L1. A virtual line segment connecting the above-mentioned center point PC and the first point P1 is defined as a second virtual line segment VL2. In this case, for example, the angle θ1 between the first virtual line segment VL1 and the second virtual line segment VL2 is an acute angle.

[0097] In the above cross section, an imaginary half line VHL having the first point P1 as an end point and passing through the second point P2 intersects, for example, with the accompanying flow regulating surface 51. In general, a half line is a straight line having only one end point.

[0098] In the above cross section, the intersection point of the imaginary half line VHL and the yarn path of the yarn Y traveling toward the contact start point PS is defined as a third point P3. (See Figure 3(b)) A virtual line segment connecting the second point P2 and the third point P3 is defined as a third virtual line segment VL3. A virtual line segment connecting the third point P3 and the contact start point PS is defined as a fourth virtual line segment VL4. The angle θ2 between the third virtual line segment VL3 and the fourth virtual line segment VL4 is, for example, an obtuse angle.

[0099] The circulation unit 50 configured as above allows the roller-accompanying flow to circulate around the entire circumference of the second heating roller 33 (see dashed arrow A1 in FIG. 3(a)). This prevents the roller-accompanying flow generated around the second heating roller 33 from moving away from the second heating roller 33 due to centrifugal force and from flowing out from the outlet 13b. The roller-accompanying flow includes air heated by the second heating roller 33. That is, the circulation unit 50 prevents the heated air from flowing out from the outlet 13b. Furthermore, by preventing the heated air from flowing out from the outlet 13b, a decrease in pressure inside the heat-insulating box 13 is prevented. This prevents cold air from the external space of the heat-insulating box 13 from flowing in from the inlet 13a. Furthermore, the roller-accompanying flow continues to be heated by the second heating roller 33 by circulating, so that a decrease in temperature of the second heating roller 33 and its vicinity is effectively prevented. As a result of these, the heat-insulating effect inside the heat-insulating box 13 is improved.

[0100] Moreover, the circulation unit 50 allows the roller-accompanying flow to circulate smoothly without being interrupted midway. That is, the circulation unit 50 is configured to circulate the roller-accompanying flow around the second heating roller 33, thereby generating a laminar flow along the yarn running direction around the second heating roller 33. This can further suppress yarn swaying.

[0101] (Fluid analysis and power consumption evaluation) The inventors of the present application conducted a fluid analysis on the heat retention effect of the circulation unit 50 in the heat retention box 13. The inventors of the present application are: An evaluation was made to see how much the heat retention effect reduced the power consumption of the heaters of the multiple heating rollers 31. This will be described in more detail below.

[0102] First, the contents of the fluid analysis (hereinafter, simply referred to as analysis), the conditions, and the analysis results will be described with reference mainly to Figs. 4 to 8(b). Fig. 4 is a diagram showing the simulation results of the flow rate of the fluid. Fig. 5 is a table showing the conditions of Examples 1 to 7 and Comparative Examples 1 to 3 described later, and the results of the fluid analysis under each condition. Fig. 6 is an excerpt of only the results of the fluid analysis in Examples 1 to 6 from the table shown in Fig. 5, rearranged in ascending order of the distance D described later. Fig. 7 is an excerpt of the conditions and the analysis results of the Examples and Comparative Examples with or without the return flow passage 49 from the table shown in Fig. 5. Fig. 8(a) is an explanatory diagram showing Comparative Example 1. Fig. 8(b) is an explanatory diagram showing Comparative Example 2.

[0103] The inventor of the present application created a model of the above-mentioned spinning and drawing apparatus 3 (i.e., the non-heated roller group 11, the heated roller group 12, and the thermal insulation box 13) using general software for fluid analysis. The inventor of the present application then performed a simulation of the flow rate of the fluid mainly in the thermal insulation box 13 (see FIG. 4). The inventor of the present application fixed the number, size, arrangement position, and peripheral speed of the non-heated rollers 21 belonging to the non-heated roller group 11, and the number, size, arrangement position, and peripheral speed of the heated rollers 31 belonging to the heated roller group 12. For reference, the number of heated rollers 31 was set to three. The diameter of each heated roller 31 was set to 300 mm. The arrangement of each heated roller 31 was the same as the arrangement described above (see FIG. 2). The peripheral speed of each heated roller 31 was set to 4690 m / min. In addition, the exhaust port (for discharging gas containing mist) of the thermal insulation box 13 was closed. However, it should be noted that these conditions were determined merely for the convenience of analysis, and that the heat retention effect of the heat retention box 13 and the heat retention effect of each heating roller 31 are not significantly affected by these conditions.

[0104] As shown in FIG. 5, the items of the conditions for the fluid analysis in Examples 1 to 7 and Comparative Examples 1 to 3 are the presence or absence of a circulation section 50, the magnitude of the distance D described later, and the presence or absence of a return flow path 49. First, the inventor of the present application set conditions for the internal structure of the heat insulation box 13. More specifically, in Examples 1 to 6, the shortest distance between the accompanied flow recovery surface 52 and the outer peripheral surface 33a in the above cross section (distance D shown in FIG. 3(b)) was made different from each other. The definition of distance D is the shortest distance between any point on the accompanied flow recovery surface 52 and any point on the outer peripheral surface 33a in the above cross section. As a more specific example, as shown in FIG. 3(b), the shortest distance between the accompanied flow recovery surface 52 and a virtual tangent VL5, which is parallel to the accompanied flow recovery surface 52 among any tangents of the outer peripheral surface 33a, is the distance D. When setting the conditions for distance D, the inventor of the present application changed the lengths of the three sides while maintaining the angle of the triangle of the guide section 46a in the above cross section constant for the convenience of analysis. In Examples 1 to 6 and Comparative Examples 1 and 2, there is no further difference in the spinning and drawing apparatus 3.

[0105] Specific values ​​of the distance D in each example will be described. More specifically, in Example 1, the distance D is 44 mm. In Example 2, the distance D is 11 mm. In Example 3, the distance D is 16.5 mm. In Example 4, the distance D is 19 mm. In Example 5, the distance D is 22 mm. In Example 6, the distance D is 88 mm. That is, the analysis results were obtained in examples in which the distance D was 11 mm or more and 88 mm or less.

[0106] The present inventor also performed analysis under the following conditions as Comparative Examples 1 and 2 for comparison with Examples 1 to 6. The present inventor performed analysis under the following conditions as Comparative Example 1, in which the circulation unit 50 was not provided near the second heating roller 33. More specifically, Comparative Example 1 is a condition in which a blocking member 53 extending from the accompanying flow recovery surface 52 toward the outer circumferential surface 33a is provided as shown in FIG. 8(a). In this case, the roller accompanying flow is not able to circulate around the second heating roller 33 very much. The analysis conditions for Comparative Example 1 are the same as those for Example 1, except that the circulation unit 50 is not provided (see FIG. 5). The present inventor also performed analysis under the condition in which the distance D is zero as Comparative Example 2. More specifically, Comparative Example 2 is a condition in which a guide unit 46a1 is provided instead of the guide unit 46a as shown in FIG. 8(b). The guide unit 46a1 has an accompanying flow recovery surface 52a in which the distance D is substantially zero. In this case, the roller accompanying flow is hardly able to circulate around the second heating roller 33. That is, in Comparative Example 2, the circulation portion 50 is formally "present" (indicated in parentheses in FIG. 5), but in reality the circulation portion 50 is not formed.

[0107] The inventor of the present application also performed an analysis to confirm whether the return flow path 49 does not need to be provided in the heat-insulating box 13. That is, regardless of whether the return flow path 49 is provided in the heat-insulating box 13, an analysis was performed to see whether the provision of the circulation unit 50 would result in an improvement compared to a configuration in which the circulation unit 50 is not provided. The inventor of the present application performed an analysis on the following Example 7 and Comparative Example 3 as a configuration in which the return flow path 49 is not provided (more specifically, a configuration in which the inlet 49a is blocked). The analysis conditions for Example 7 are the same as those for Example 1, except that the return flow path 49 is not provided (see FIGS. 5 and 7). The analysis conditions for Comparative Example 3 are the same as those for Comparative Example 1, except that the return flow path 49 is not provided (see FIGS. 5 and 7).

[0108] The inventor of the present application evaluated the simulation results (see FIG. 4) of the flow rate of the fluid (air) in the heat-retaining box 13. FIG. 4 shows the simulation results of Example 1 as a representative example. In the diagram of the simulation results, the darker the color, the slower the air flow rate (i.e., the smaller the air flow rate), and the whiter the color, the faster the air flow rate (i.e., the larger the air flow rate). The inventor of the present application confirmed the generation of vortexes in the heat-retaining box 13 in the simulation results and judged whether the air flow was turbulent under each condition. This is because the turbulence of the air flow can cause thread breakage. The inventor of the present application divided the evaluation of the turbulence of the air flow into three stages: "absent," "slightly present," and "present" (see FIG. 5 and FIG. 6). When the turbulence of the air flow was "absent" or "slightly present," the inventor of the present application made a final judgment by further taking into consideration the heat-retaining effect described later. On the other hand, when the turbulence of the air flow was "present," the inventor of the present application judged it as "NG" regardless of the magnitude of the heat-retaining effect.

[0109] The inventors of the present application obtained simulation values ​​of the air flow rate (hereinafter, simply referred to as flow rate) at three locations in the thermal insulation box 13 as an index of the thermal insulation effect of the thermal insulation box 13 (see Figs. 5 to 7). The three locations are the vicinity of the inlet 13a, the vicinity of the outlet 13b, and the vicinity of the above-mentioned second point P2 (see Fig. 3(b)). The unit of flow rate is m / s. A negative sign of the flow rate near the inlet 13a means that cold gas is flowing into the thermal insulation box 13 through the inlet 13a. A positive sign of the flow rate near the outlet 13b means that warm gas is flowing out of the thermal insulation box 13 through the outlet 13b. The closer the flow rate near the inlet 13a is to zero, the smaller the inflow (flow rate) of cold gas from the inlet 13a. The closer the flow rate near the outlet 13b is to zero, the smaller the outflow (flow rate) of warm gas from the outlet 13b. The greater the flow velocity in the vicinity of the second point P2, the greater the flow rate of the gas circulated by the circulation section 50.

[0110] The inventors of the present application set the evaluation criteria for the flow velocity at each of the above three locations as follows. When the flow velocity near the inlet 13a is -0.50 m / s or more, the flow velocity is deemed to be good (low flow rate). When the flow velocity near the outlet 13b is 0.50 m / s or less, the flow velocity is deemed to be good (low flow rate). When the flow velocity near the second point P2 is 2.00 m / s or more, the flow velocity is deemed to be good (high flow rate). These good flow velocities mean that the heat retention effect in the heat retention box 13 is high. When the flow velocity is good at all locations and the airflow turbulence is "none" or "slightly present", the judgment is at least "OK". In addition, the inventors of the present application have determined that the airflow is "VG (very good)" when the airflow velocity near the inlet 13a is -0.35 m / s or more, the airflow velocity near the outlet 13b is 0.35 m / s or less, the airflow velocity near the second point P2 is 2.50 m / s or more, and there is "no" airflow turbulence. "VG" is a rating that indicates a better result than "OK."

[0111] The analysis results and the evaluation results will be described. As shown in Figs. 5 and 6, for example, in Example 1, the flow velocity in the vicinity of the inlet 13a was -0.35 m / s or more, the flow velocity in the vicinity of the outlet 13b was 0.35 m / s or less, and the flow velocity in the vicinity of the second point P2 was 2.50 m / s or more. In addition, the turbulence of the airflow was "none". The inventor of the present application judged Example 1 as "VG". Similarly, the inventor of the present application judged Examples 2, 3, 4, and 6 as "OK", and judged Example 5 as "VG". From the above, in Examples 1 to 6 in which the circulation section 50 and the return flow path 49 are provided, the judgments are all "OK" or "VG".

[0112] In addition, the following analysis results were obtained in Example 7, in which the heat insulation box 13 was provided with the circulation section 50 and the return flow path 49 was not provided. That is, in Example 7, the flow velocity near the inlet 13a was -0.50 m / s, the flow velocity near the outlet 13b was -0.49 m / s, and the flow velocity near the second point P2 was 4.50 m / s. In addition, there was no turbulence in the airflow. The inventors of the present application judged Example 7 as "OK."

[0113] On the other hand, in Comparative Example 1 (see FIG. 5), the flow velocity in the vicinity of the second point P2 was less than 2.00 m / s. Also, the airflow was turbulent. The inventor of the present application judged Comparative Example 1 as "NG." In Comparative Example 2 (see FIG. 5), the flow velocity in the vicinity of the second point P2 was not calculated. Also, the airflow was turbulent. The inventor of the present application judged Comparative Example 2 as "NG." Also, in Comparative Example 3, the flow velocity in the vicinity of the inlet 13a was -0.70 m / s, and the flow velocity in the vicinity of the outlet 13b was 0.72 m / s. Also, the flow velocity in the vicinity of the second point P2 was not calculated. Also, the airflow was turbulent. The inventor of the present application judged Comparative Example 3 as "NG."

[0114] From the above results, it was found that a very good flow rate (flow rate) can be obtained while suppressing yarn swaying by providing both the circulation section 50 and the return flow path 49 in the heat retention box 13. It was also found that even if the return flow path 49 is not provided in the heat retention box 13, a good flow rate (flow rate) can be obtained while suppressing yarn swaying by providing the circulation section 50.

[0115] Next, the contents of the evaluation of the heater power consumption and the results will be described. The inventors of the present application created an apparatus corresponding to Example 1 and an apparatus corresponding to Comparative Example 1, and operated multiple rollers in each apparatus in the same manner as the analysis conditions, and then measured and added up the power consumption of the heaters of the three heating rollers. The surface temperature of each heating roller was set to 170°C. Example 1In the comparative example 1, the combined power consumption was 1.4 kW. In the comparative example 1, the combined power consumption was 2.1 kW. Therefore, it was found that at least in the example 1, the power consumption was reduced compared to the comparative example 1. Here, as described above, the conditions of the comparative example 1 are the same as those of the example 1, except that the circulation unit 50 is not provided. Therefore, it is inferred that the power consumption is reduced in the other examples as well by providing the circulation unit 50.

[0116] As described above, in this embodiment, since three heating rollers 31 are provided, the yarn Y can be sufficiently heated without using a Nelson roller, which is likely to cause yarn swaying. Therefore, yarn swaying can be suppressed compared to a configuration in which a Nelson roller is provided. Furthermore, in this embodiment, the roller-accompanying flow is circulated around the second heating roller 33 by the circulation unit 50, so that the gas heated by the second heating roller 33 can be prevented from escaping from the heat-insulating box 13 through the outlet 13b of the yarn Y. This improves the heat-insulating effect in the heat-insulating box 13. In addition, by circulating the roller-accompanying flow by the circulation unit 50, the air forming the roller-accompanying flow can be continuously heated by the second heating roller 33. This improves the heat-insulating effect in the vicinity of the second heating roller 33, and as a result, the heat-insulating effect of the second heating roller 33 itself can be improved. Therefore, in the spinning and drawing device 3, it is possible to suppress an increase in power consumption while suppressing yarn swaying.

[0117] Moreover, the yarn sending speed may be made different among the three heating rollers 31. This makes it possible to intentionally increase the tension applied to the yarn Y or intentionally relax the yarn Y. In this way, the yarn quality can be controlled.

[0118] In addition, a stable laminar flow can be formed by the roller-accompanying flow circulating around the second heating roller 33. Therefore, even if the flow rate of the circulating gas is large, yarn swaying can be suppressed.

[0119] In addition, the roller-accompanying flow recovery surface 52 can prevent the roller-accompanying flow from escaping to the outside in the radial direction of the outer circumferential surface 33a due to centrifugal force. Therefore, the roller-accompanying flow can be effectively circulated with a simple configuration.

[0120] In addition, the first point P1 is disposed at a position close to the contact end point PE. This makes it easy for the accompanying flow flowing near the contact end point PE to be taken in (recovered) by the accompanying flow recovery surface 52. Therefore, the roller accompanying flow can be circulated effectively.

[0121] In addition, the angle θ1 between the first virtual line segment VL1 and the second virtual line segment VL2 is an acute angle. This allows the roller-accompanying flow flowing near the first point P1 to be guided radially inward while being swept away in the circumferential direction by the roller-accompanying flow recovery surface 52. This allows the roller-accompanying flow to flow smoothly along the roller-accompanying flow recovery surface 52.

[0122] In addition, the accompanied flow recovery surface 52 forms a line segment L1 connecting the first point P1 and the second point P2. Therefore, the roller accompanied flow can be caused to flow smoothly along the accompanied flow recovery surface 52. In addition, compared with the case where the accompanied flow recovery surface 52 is curved or bent, the accompanied flow recovery surface 52 can be formed by simple processing.

[0123] Furthermore, the circulation portion 50 has an accompanying flow restriction surface 51. This can further prevent the roller accompanying flow from escaping to the outside in the radial direction of the outer circumferential surface 33a due to centrifugal force.

[0124] In addition, the imaginary half line VHL intersects with the accompanying flow regulating surface 51. This allows the roller accompanying flow guided along the accompanying flow recovery surface 52 to be supplied toward the accompanying flow regulating surface 51. This allows the roller accompanying flow to circulate more effectively.

[0125] In addition, the angle θ2 between the third imaginary line segment VL3 and the fourth imaginary line segment VL4 is an obtuse angle. This makes it possible to prevent the roller-accompanying flow guided along the accompanying flow collecting surface 52 from flowing against the traveling direction of the yarn Y. As a result, yarn swaying can be suppressed.

[0126] Moreover, the shortest distance (distance D) between the outer circumferential surface 33a and the accompanying flow recovery surface 52 is preferably 11 mm or more and 88 mm or less, thereby enabling a large amount of the roller accompanying flow to circulate.

[0127] Furthermore, the heating roller 31 most upstream in the yarn running direction (i.e., the first heating roller 32) is likely to be cooled by the cold air flowing in from the inlet 13a formed in the heat-retaining box 13. In this regard, it is preferable that the heat-retaining box 13 has a return flow path 49. This allows high-temperature gas in the vicinity of the third heating roller 34 to be supplied to the vicinity of the first heating roller 32 via the return flow path 49. This effectively improves the heat retention effect of the first heating roller 32. However, even if the heat-retaining box 13 does not have the return flow path 49, the circulation unit 50 can be provided to suppress yarn swaying while suppressing an increase in power consumption.

[0128] In addition, the second heating roller 33 Around A circulation section 50 is provided at the entrance 13a. When the yarn Y enters the heat-insulating box 13 through the entrance 13a, the yarn-accompanying flow also flows into the heat-insulating box 13. 31 Among them, the first heating roller 32, which is the most upstream in the yarn running direction, is likely to be cooled by such cold air flowing in from outside the heat retention box 13. Since the second heating roller 33 is relatively close to the first heating roller 32, the heat generated from the second heating roller 33 can be transferred to the first heating roller 32 by improving the heat retention effect of the second heating roller 33. This can also improve the heat retention effect of the first heating roller 32.

[0129] In addition, the blocking member 48 can prevent the yarn accompanying flow from flowing out of the thermal insulation box 13 through the outlet 13b. Therefore, the thermal insulation effect inside the thermal insulation box 13 can be improved.

[0130] Furthermore, the yarn Y is drawn upstream of the first heating roller 32 in the yarn running direction. Since three or more heating rollers 31 are provided downstream of the region where the yarn Y is drawn in the yarn running direction, the yarn Y can be firmly gripped. This makes it possible to prevent the yarn Y on the heating rollers 31 from slipping due to tension applied to the drawn yarn Y. This makes it possible to further suppress yarn swaying.

[0131] In addition, the heat insulation box 13 can suppress the transfer of heat between the third non-heated roller 24 and the first heated roller 32. Therefore, even if the heating temperatures of the third non-heated roller 24 and the first heated roller 32 are significantly different, the influence of the temperature difference can be suppressed.

[0132] Furthermore, since the non-heated roller 21 does not need to be heated, there is no need for it to be housed in the heat-retaining box 13. Therefore, the interior of the heat-retaining box 13 can be designed more freely than in a configuration in which, for example, a heating roller (not shown) having a different set temperature from that of the heating roller 31 may be housed in the heat-retaining box 13 instead of the non-heated roller 21.

[0133] In addition, three or more heat fixing rollers (heating rollers 31) are provided. Therefore, the yarn Y can be sufficiently heat fixed without using a Nelson roller, which is likely to cause yarn shaking.

[0134] Moreover, the configuration of this embodiment is particularly effective in drawing the yarn Y made of nylon.

[0135] Next, a modified example of the embodiment will be described, in which the same reference numerals will be used to designate components similar to those in the embodiment, and the description thereof will be omitted as appropriate.

[0136] (1) In the above embodiment, the circulation section 50 is provided in correspondence with the second heating roller 33. Furthermore, the accompanying flow recovery surface 45b (see FIG. 9; the most downstream accompanying flow recovery surface of the present invention) may be provided in correspondence with the third heating roller 34. When viewed, for example, from the front-rear direction (the axial direction of the third heating roller 34), the accompanying flow recovery surface 45b is disposed closer to the outlet 13b than the center of the third heating roller 34. The accompanying flow recovery surface 45b is disposed to face a portion (the most downstream non-contact surface 34c) of the outer peripheral surface 34a of the third heating roller 34 on which the yarn Y is not wound. The accompanying flow recovery surface 45b is disposed between a yarn path upstream in the yarn running direction from a portion (the most downstream contact surface 34b) of the outer peripheral surface 34a on which the yarn Y is wound, and a yarn path downstream in the yarn running direction from the most downstream contact surface 34b. This modification is referred to as "Modification 1" (see FIG. 11). In the first modification, the distance D is 44 mm, the same as in the first embodiment. In the first modification, the return flow path 49 is provided in the heat insulation box 13. In the first modification, the "other" column in the table of the analysis results shown in FIG. 11 lists "Condition A" as a condition indicating the installation of the accompanying flow recovery surface 45b. In the first modification, the gas flow velocity near the inlet 13a was -0.23 m / s, and the gas flow velocity near the outlet 13b was 0.21 m / s, which were very good analysis results. The inventor of the present application judged the first modification as "VG". In this way, a part of the roller accompanying flow of the third heating roller 34 can be returned to the upstream side in the yarn running direction by the accompanying flow recovery surface 45b. As a result, the roller accompanying flow passes through the outlet 13b and returns to the heat insulation box 13. 13 This can prevent leakage from the

[0137] Moreover, a modification having the same configuration as modification 1 except that return flow path 49 is not provided in heat insulation box 13 is referred to as "modification 2." In modification 2, favorable analysis results were obtained, with the gas flow velocity near inlet 13a being -0.49 m / s and the gas flow velocity near outlet 13b being 0.48 m / s. The inventors of the present application judged modification 2 as "OK."

[0138] (2) In the above embodiment, the circulation section 50 is provided corresponding to the second heating roller 33. In addition, a circulation section may be provided corresponding to the first heating roller 32. In this case, in addition to the second heating roller 33, the first heating roller 32 also corresponds to the predetermined upstream heating roller of the present invention. More specifically, as shown in FIG. 10, the inner wall surface 41c and the wall surface 43a of the flow straightening member 43 on the first heating roller 32 side are included in the accompanying flow regulating surface of the present invention. At the left end of the flow straightening member 44M provided instead of the flow straightening member 44, instead of the blocking portion 44a, an accompanying flow collecting surface 44Ma curved to follow the outer circumferential surface 32a of the first heating roller 32 is formed. In this modification, a backflow prevention wall 54 may be provided near the inlet 13a to prevent air from flowing back inside the heat insulation box 13 and flowing out from the inlet 13a. The backflow prevention wall 54 may be provided with an accompanying flow recovery surface 54a having the same function as the accompanying flow recovery surface 44Ma. The above-mentioned blocking member 47 (see FIG. 2) is not provided. This modification is called "Modification 3" (see FIG. 11). In Modification 3, the distance D is 44 mm, the same as in Example 1. In Modification 3, a return flow path 49 is provided in the heat-retaining box 13. In Modification 3, the "Other" column in the analysis result table shown in FIG. 11 lists "Condition B" as a condition indicating the installation of a circulation section corresponding to the first heating roller 32. In Modification 3, the gas flow velocity near the inlet 13a was -0.28 m / s, and the gas flow velocity near the outlet 13b was 0.28 m / s, which was a very good analysis result. The inventor of the present application judged Modification 3 as "VG". In this modification, the heat retention effect of the first heating roller 32 on the most upstream side can be improved. Therefore, power consumption can be effectively reduced. It can be inferred from the analysis results of Modifications 1 and 2 that good analysis results can be obtained even in a configuration in which the return flow path 49 is not provided in the heat insulation box 13.

[0139] In this modified example, the circulation unit 50 corresponding to the second heating roller 33 may not be provided. That is, for example, only the circulation unit corresponding to the first heating roller 32 may be provided.

[0140] Alternatively, the heat-retaining box 13 may be configured to satisfy both the above-mentioned conditions A and B. In this case, the circulating section 50 corresponding to the second heating roller 33 does not need to be provided.

[0141] (3) In the above embodiment, the accompanying flow recovery surface 52 forms a line segment L1 connecting the first point P1 and the second point P2. However, this is not limited to this. For example, as shown in FIG. 12(a) and FIG. 12(b), in a circulation section 50C provided in place of the circulation section 50, an accompanying flow recovery surface 52C may be provided in place of the accompanying flow recovery surface 52. The accompanying flow recovery surface 52C may be formed in a guide section 46C provided in place of the guide section 46a. The accompanying flow recovery surface 52C may be curved so as to bulge outward in the radial direction from the above-mentioned line segment L1. Alternatively, instead of the accompanying flow recovery surface 52C, a bent surface (not shown) bent so as to bulge outward in the radial direction from the line segment L1 may be provided. In this case, it is preferable that the bending angle of the bent surface is obtuse in a cross section perpendicular to the front-rear direction.

[0142] (4) In the above embodiments, the spinning and drawing device 3 has the non-heated roller group 11. However, this is not limited to this. Instead of or in addition to the non-heated roller group 11, a heated roller (not shown; outer roller of the present invention) having a set temperature lower than that of the heated roller 31 may be provided. The yarn Y may be drawn between such a heated roller and the first heated roller 32. Alternatively, no roller may be provided upstream of the first heated roller 32 in the yarn running direction.

[0143] (5) In the above-described embodiment, the shortest distance (distance D) between the outer peripheral surface 33a and the entrained flow recovery surface 52 in the above cross section is set to be 11 mm or more and 88 mm or less. However, this is not limited to this. That is, even if the distance D is smaller than 11 mm or larger than 88 mm in the predetermined upstream heating roller of the present invention, it is sufficient that the roller entrained flow can be circulated around the predetermined upstream heating roller.

[0144] (6) In the above-described embodiments, the first point P1 is disposed between the axis of symmetry VLs and the imaginary downstream straight line VLd in the cross section. However, this is not limited to this. The first point P1 does not have to be disposed between the axis of symmetry VLs and the imaginary downstream straight line VLd.

[0145] (7) In the above embodiments, the angle θ1 is an acute angle in the cross section. However, this is not limited to this. The angle θ1 may be an obtuse angle. Also, the angle θ2 is an obtuse angle in the cross section. However, this is not limited to this. The angle θ2 may be an acute angle.

[0146] (8) In the above-described embodiment, the imaginary half line VHL intersects with the accompanying flow regulating surface 51 in the cross section. However, this is not limited to this. The imaginary half line VHL does not have to intersect with the accompanying flow regulating surface 51.

[0147] (9) In the above-described embodiments, the circulation section 50 has the accompanying flow regulating surface 51 and the accompanying flow collecting surface 52. However, this is not limited to this. For example, a part of the circulation section 50 may be formed in the rear wall 42 or the front door (not shown). That is, a part of the rear wall 42 may protrude rearward, or a part of the front wall may protrude forward, to form an air path that allows the roller-accompanying flow to circulate around the upstream heating roller.

[0148] (10) In the above embodiment, the circulation unit 50 generates a laminar flow. However, this is not limited to this. The circulation unit 50 does not necessarily have to generate a laminar flow.

[0149] (11) In the above embodiment, the heating roller group 12 includes three heating rollers 31. However, the number of heating rollers 31 is not limited to this. A specific example will be described with reference to Fig. 13(a) and Fig. 13(b). The spinning and drawing device 3A (see Fig. 13(a)) may have, for example, four heating rollers 61 instead of the three heating rollers 31. That is, the spinning and drawing device (reference numerals omitted) may have three or more heating rollers (reference numerals omitted). The spinning and drawing device 3A may have a horizontally long heat-retaining box 70 instead of the heat-retaining box 13. The heat-retaining box 70 has an inlet 70a and an outlet 70b for the yarn Y. The heat-retaining box 70 may house, as the four heating rollers 61, a first heating roller 62, a second heating roller 63, a third heating roller 64, and a fourth heating roller 65 in order from the upstream side in the yarn running direction. The first heating roller 62 corresponds to the most upstream heating roller and the upstream heating roller of the present invention. The second heating roller 63 and the third heating roller 64 correspond to the upstream heating roller, the predetermined upstream heating roller, and the intermediate heating roller, respectively, of the present invention. The fourth heating roller 65 corresponds to the most downstream heating roller of the present invention. That is, the number of intermediate heating rollers is not limited to one, and may be two (or may be more than two). The first heating roller 62, the second heating roller 63, the third heating roller 64, and the fourth heating roller 65 may be arranged, for example, in a zigzag pattern in the left-right direction. An accompanying flow regulating surface 71a may be provided corresponding to the first heating roller 62. A circulation section 72 may be provided corresponding to the second heating roller 63. The circulation section 72 may have an accompanying flow regulating surface 72a and an accompanying flow collecting surface 72b. The third heating roller 64 The circulation section 73 may be provided corresponding to each of the intermediate rollers. The circulation section 73 may have an accompanying flow regulating surface 73a and an accompanying flow collecting surface 73b. In other words, a circulation section may be provided corresponding to each of the intermediate rollers. This makes it possible to effectively improve the heat retention effect inside the heat retention box 70. Fourth heating roller 65In response to the above, an accompanying flow regulating surface 74a may be provided. Alternatively, the spinning and drawing apparatus 3B (see FIG. 13(b)) may have a vertically long heat-retaining box 80 instead of the heat-retaining box 70. In the heat-retaining box 80, the first heating roller 62, the second heating roller 63, the third heating roller 64, and the fourth heating roller 65 may be arranged, for example, vertically in a zigzag pattern. In other words, the heating rollers 61 may be arranged in any manner. Also, the number of heating rollers 61 may be greater. Five or more heating rollers 61 may be provided (not shown).

[0150] (12) The present invention may be applied to a heating roller (not shown) other than a heat fixing roller.

[0151] (13) In the above embodiments, the yarn Y is made of nylon. However, this is not limited to this. The spinning and drawing device 3 may draw a drawable yarn (not shown) other than the yarn Y made of nylon. [Explanation of symbols]

[0152] 3. Spinning and drawing equipment 13 Heat insulation box 13b Exit 24 Third non-heated roller (outer roller) 31 Heating roller 32 First heating roller (upstream heating roller, upstream heating roller, predetermined upstream heating roller) 33 Second heating roller (upstream heating roller, predetermined upstream heating roller, predetermined heating roller, intermediate heating roller) 33a Outer surface 33b Contact surface 33c Non-contact surface 34 Third heating roller (downstream heating roller, most downstream heating roller) 34a Outer surface 34b Most downstream contact surface 34c Most downstream non-contact surface 41c Inner wall surface (accompanying flow control surface) 43a Wall (flow restriction surface) 46 Straightening member (partition) 48 Shut-off member (shut-off part) 49 Return flow path 50 Circulation section (prescribed circulation section) 51 Wake flow control surface 52 Accompanying flow recovery surface 61 Heating roller 62 First heating roller (upstream heating roller, upstream heating roller) 63 Second heating roller (upstream heating roller, predetermined upstream heating roller, intermediate heating roller) 64 Third heating roller (upstream heating roller, predetermined upstream heating roller, intermediate heating roller) 65 Fourth heating roller (most downstream heating roller) 70 Heat insulation box 70b exit 72 Circulation section 72a Adjacent flow control surface 72b Accompanying flow recovery surface 73 Circulation section 73a Adjacent flow control surface 73b Accompanying flow recovery surface L1 line segment P1 First point P2 Second point P3 Third point VHL Virtual half line VL1 First virtual line segment VL2 Second virtual line segment VL3 Third virtual line segment VL4 Fourth virtual line segment VLd Virtual downstream line VLs Symmetry axis VLu Virtual upstream line Y Thread θ1 angle θ2 angle

Claims

1. A spinning and drawing device that draws a running yarn spun from a spinning device, three or more heating rollers around which the yarn is wound at a winding angle of less than 360 degrees, and which are configured to heat the yarn and feed it downstream in a yarn running direction; a heat insulating box that houses the three or more heating rollers, The three or more heating rollers are an upstream heating roller disposed most upstream in the yarn running direction among the three or more heating rollers; a most downstream heating roller arranged at the most downstream side in the yarn running direction among the three or more heating rollers; one or more intermediate heating rollers arranged downstream of the most upstream heating roller and upstream of the most downstream heating roller in the yarn running direction, The insulated box is one or more circulation units arranged around one or more predetermined upstream heating rollers among the two or more upstream heating rollers including the most upstream heating roller and the one or more intermediate heating rollers, and configured to circulate a roller-accompanying flow, which is an accompanying flow generated by rotation of each of the one or more predetermined upstream heating rollers, around the entire circumference of each of the one or more predetermined upstream heating rollers; the one or more predetermined upstream heating rollers include the one or more intermediate heating rollers, The spinning and drawing apparatus is characterized in that the one or more circulation units are provided corresponding to all of the one or more intermediate heating rollers.

2. The predetermined circulation section, which is any one of the one or more circulation sections, In a cross section perpendicular to the rotation axis direction of a predetermined heating roller corresponding to the predetermined circulation portion among the one or more predetermined upstream heating rollers, When the most upstream point of the contact surface of the outer peripheral surface of the predetermined heating roller with which the yarn is in contact is defined as a contact start point in the yarn running direction, and the most downstream point of the contact surface in the yarn running direction is defined as a contact end point, the entrained flow recovery surface is disposed so as to face a non-contact surface of the outer peripheral surface with which the yarn is not in contact, and is disposed so as to be sandwiched, in the circumferential direction of the predetermined heating roller, between an upstream yarn path that is a yarn path upstream of the contact start point in the yarn running direction and a downstream yarn path that is a yarn path downstream of the contact end point in the yarn running direction, and includes a first point that is an end point closest to the contact end point in the circumferential direction and a second point that is an end point closest to the contact start point in the circumferential direction.

3. 3. The spinning and drawing apparatus according to claim 2, wherein, in the cross section, an angle formed by a first virtual line segment that is a virtual line segment connecting the first point and the second point and a second virtual line segment that is a virtual line segment connecting the center of the predetermined heating roller in the radial direction and the first point is an acute angle.

4. 3. The spinning and drawing apparatus according to claim 2, wherein the shortest distance between the outer peripheral surface and the accompanying flow recovery surface in the cross section is 11 mm or more and 88 mm or less.

5. A spinning and drawing apparatus as described in Claim 3, characterized in that in the cross section, the shortest distance between the outer surface and the accompanying flow recovery surface is 11 mm or more and 88 mm or less.

6. A spinning and drawing device that draws a running yarn spun from a spinning device, three or more heating rollers around which the yarn is wound at a winding angle of less than 360 degrees, and which are configured to heat the yarn and feed it downstream in a yarn running direction; a heat insulating box that houses the three or more heating rollers, The three or more heating rollers are an upstream heating roller disposed most upstream in the yarn running direction among the three or more heating rollers; a most downstream heating roller arranged at the most downstream side in the yarn running direction among the three or more heating rollers; one or more intermediate heating rollers arranged downstream of the most upstream heating roller and upstream of the most downstream heating roller in the yarn running direction, The insulated box is one or more circulation units arranged around one or more predetermined upstream heating rollers among the two or more upstream heating rollers including the most upstream heating roller and the one or more intermediate heating rollers, and configured to circulate a roller-accompanying flow, which is an accompanying flow generated by rotation of each of the one or more predetermined upstream heating rollers, around the entire circumference of each of the one or more predetermined upstream heating rollers; The predetermined circulation section, which is any one of the one or more circulation sections, In a cross section perpendicular to the rotation axis direction of a predetermined heating roller corresponding to the predetermined circulation portion among the one or more predetermined upstream heating rollers, When the most upstream point of the contact surface of the outer peripheral surface of the predetermined heating roller with which the yarn is in contact is defined as a contact start point in the yarn running direction, and the most downstream point of the contact surface in the yarn running direction is defined as a contact end point, an entrained flow recovery surface that is disposed so as to face a non-contact surface of the outer peripheral surface with which the yarn is not in contact, and that is disposed so as to be sandwiched, in the circumferential direction of the predetermined heating roller, between an upstream yarn path that is a yarn path upstream of the contact start point in the yarn running direction and a downstream yarn path that is a yarn path downstream of the contact end point in the yarn running direction, and that includes a first point that is an end point closest to the contact end point in the circumferential direction and a second point that is an end point closest to the contact start point in the circumferential direction, A spinning and drawing apparatus, characterized in that, in the cross section, the shortest distance between the outer peripheral surface and the accompanying flow recovery surface is 11 mm or more and 88 mm or less.

7. 7. The spinning and drawing apparatus according to claim 6, wherein, in the cross section, an angle formed by a first virtual line segment that is a virtual line segment connecting the first point and the second point and a second virtual line segment that is a virtual line segment connecting the center of the predetermined heating roller in the radial direction and the first point is an acute angle.

8. 7. The spinning and drawing apparatus according to claim 6, wherein the one or more circulation sections are respectively disposed around the one or more intermediate heating rollers.

9. A spinning and drawing apparatus as described in Claim 7, characterized in that the one or more circulation sections are each arranged around the one or more intermediate heating rollers.

10. A spinning and drawing device that draws a running yarn spun from a spinning device, three or more heating rollers around which the yarn is wound at a winding angle of less than 360 degrees, and which are configured to heat the yarn and feed it downstream in a yarn running direction; a heat insulating box that houses the three or more heating rollers, The three or more heating rollers are an upstream heating roller disposed most upstream in the yarn running direction among the three or more heating rollers; a most downstream heating roller arranged at the most downstream side in the yarn running direction among the three or more heating rollers; one or more intermediate heating rollers arranged downstream of the most upstream heating roller and upstream of the most downstream heating roller in the yarn running direction, The insulated box is one or more circulation units arranged around one or more predetermined upstream heating rollers among the two or more upstream heating rollers including the most upstream heating roller and the one or more intermediate heating rollers, and configured to circulate a roller-accompanying flow, which is an accompanying flow generated by rotation of each of the one or more predetermined upstream heating rollers, around the entire circumference of each of the one or more predetermined upstream heating rollers; The predetermined circulation section, which is any one of the one or more circulation sections, In a cross section perpendicular to the rotation axis direction of a predetermined heating roller corresponding to the predetermined circulation portion among the one or more predetermined upstream heating rollers, When the most upstream point of the contact surface of the outer peripheral surface of the predetermined heating roller with which the yarn is in contact is defined as a contact start point in the yarn running direction, and the most downstream point of the contact surface in the yarn running direction is defined as a contact end point, an entrained flow recovery surface that is disposed so as to face a non-contact surface of the outer peripheral surface with which the yarn is not in contact, and that is disposed so as to be sandwiched, in the circumferential direction of the predetermined heating roller, between an upstream yarn path that is a yarn path upstream of the contact start point in the yarn running direction and a downstream yarn path that is a yarn path downstream of the contact end point in the yarn running direction, and that includes a first point that is an end point closest to the contact end point in the circumferential direction and a second point that is an end point closest to the contact start point in the circumferential direction, a first virtual line segment that is a virtual line segment connecting the first point and the second point, and a second virtual line segment that is a virtual line segment connecting the center of the predetermined heating roller in the radial direction and the first point, forming an acute angle in the cross section.

11. The spinning and drawing apparatus according to claim 10, wherein the one or more circulation sections are respectively disposed around the one or more intermediate heating rollers.

12. In the cross section, a virtual upstream line including the contact start point and partially overlapping with the upstream yarn path, and a virtual downstream line including the contact end point and partially overlapping with the downstream yarn path are symmetrical with respect to a predetermined axis of symmetry, The spinning and drawing apparatus according to any one of claims 2 to 11, wherein the first point is disposed between the axis of symmetry and the imaginary downstream line.

13. In the cross section, The entrained flow recovery surface is The spinning and drawing apparatus according to any one of claims 2 to 11, characterized in that a line segment connecting the first point and the second point is formed, or the line segment is curved or bent to form an obtuse angle so as to bulge outward in the radial direction of the predetermined heating roller relative to the line segment.

14. The spinning and drawing apparatus according to claim 13, wherein the accompanying flow recovery surface forms the line segment in the cross section.

15. The fiber drawing apparatus according to any one of claims 2 to 11, wherein the predetermined circulation section has an accompanying flow regulating surface arranged so as to surround the contact surface in the circumferential direction.

16. 16. The spinning and drawing apparatus according to claim 15, wherein in the cross section, an imaginary half line having the first point as an end point and passing through the second point intersects with the accompanying flow regulating surface.

17. When an intersection of an imaginary half line having the first point as an end point and passing through the second point and a yarn path of the yarn traveling toward the contact start point is defined as a third point in the cross section, The spinning drawing apparatus according to any one of claims 2 to 11, characterized in that, in the cross section, an angle formed by a third virtual line segment that is a virtual line segment connecting the second point and the third point and a fourth virtual line segment that is a virtual line segment connecting the third point and the contact start point is an obtuse angle.

18. The spinning and drawing apparatus according to any one of claims 1 to 11, wherein the one or more circulation units are configured to circulate the roller-accompanying flow around each of the one or more predetermined upstream heating rollers, thereby generating a laminar flow along the yarn running direction around each of the one or more predetermined upstream heating rollers.

19. The insulated box is a partition portion disposed between the most downstream heating roller and a predetermined one of the one or more intermediate heating rollers and the most upstream heating roller; The spinning and drawing apparatus according to any one of claims 1 to 11, further comprising: a return flow path that connects a downstream space on the downstream heating roller side of the partition unit with an upstream space on the most upstream heating roller side of the partition unit.

20. The insulated box is a partition portion disposed between the most downstream heating roller and a predetermined one of the one or more intermediate heating rollers and the most upstream heating roller; 13. The spinning and drawing apparatus according to claim 12, further comprising: a return flow path that connects a downstream space on the downstream heating roller side of the partition unit with an upstream space on the most upstream heating roller side of the partition unit.

21. 12. The spinning and drawing apparatus according to claim 1, wherein the one or more predetermined upstream heating rollers include the most upstream heating roller.

22. The insulated box is an outlet for the yarn; a blocking section extending toward a most downstream contact surface on an outer circumferential surface of the most downstream heating roller around which the yarn is wound, the blocking section blocking a yarn accompanying flow generated by the yarn traveling toward the outlet.

23. The insulated box is In a cross section perpendicular to the rotation axis direction of the most downstream heating roller, the most downstream accompanying flow recovery surface is disposed so as to face a most downstream non-contact surface of the outer circumferential surface of the most downstream heating roller, on which the yarn is not wound, and is disposed so as to be sandwiched between a yarn path upstream of the most downstream contact surface in the yarn running direction and a yarn path downstream of the most downstream contact surface in the yarn running direction.

24. 12. The spinning and drawing apparatus according to claim 1, wherein the yarn is drawn upstream of the most upstream heating roller in the yarn running direction.

25. an outer roller disposed outside the heat-insulating box and upstream of the three or more heating rollers in the yarn running direction, around which the yarn is wound before being drawn; 25. The spinning and drawing apparatus according to claim 24, wherein the yarn is drawn between the outer roller and the most upstream heated roller in the yarn running direction.

26. 26. The spinning and drawing apparatus according to claim 25, wherein the outer roller is a non-heating roller that does not heat the yarn.

27. 12. The spinning and drawing apparatus according to claim 1, wherein each of the three or more heating rollers is a heat setting roller for heat setting the drawn yarn.

28. 12. The spinning and drawing apparatus according to claim 1, wherein the yarn is made of nylon.

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