JP7586766B2 - Spinning and drawing equipment - Google Patents

Description

The present invention relates to a spinning and drawing device equipped with an insulation box that houses a yarn heating roller that heats the yarn.

Patent Document 1 discloses a spinning and drawing device in which a number of rollers, including a yarn heating roller, are housed in an insulation box, in which a yarn inlet and a yarn outlet are formed in the wall that forms the insulation box, and which has a first straightening section that is disposed on the inner surface of the wall of the insulation box through which air flows toward the yarn outlet and directs the airflow inward. The first straightening section directs the airflow flowing along the wall inward, thereby suppressing the outflow of high-temperature air from the yarn outlet, thereby reducing the loss of thermal energy.

In the thermal insulation box of Patent Document 1, low-temperature air from outside the box flows in through the yarn inlet near the yarn inlet. In addition, low-temperature yarn introduced from the outside through the yarn inlet is wound around a heating roller arranged near the yarn inlet. For this reason, while the loss of thermal energy flowing out from the yarn outlet can be suppressed in the thermal insulation box of Patent Document 1, the loss of thermal energy due to the low-temperature air flowing in from the yarn inlet cannot be suppressed, and the amount of power consumed to heat the roller increases.

Patent Document 2 discloses a spinning winding system including a thermal insulation box that houses a plurality of rollers and an air duct attached to the thermal insulation box.
The high-temperature air in the vicinity of the yarn outlet in the heat-retaining box is guided to the low-temperature air area in the vicinity of the yarn inlet in the heat-retaining box, thereby making it possible to utilize thermal energy efficiently.

Patent No. 6088948 JP 2014-101611 A

However, in the device of Patent Document 2, the hot air near the yarn outlet is led to the air duct in a direction perpendicular to the end face of the roller, i.e., perpendicular to the running direction of the yarn wound around the roller. The hot air passing through the air duct is then guided to the low-temperature air region from a direction perpendicular to the running direction of the yarn wound around the roller. This can cause airflow disturbances in the direction perpendicular to the running direction of the yarn near the entrance and exit of the air duct, which can cause yarn swaying. Yarn swaying has an adverse effect on the quality of the yarn.

The objective of the present invention is to provide a spinning and drawing device that realizes efficient use of thermal energy in an insulation box while suppressing the swaying of the yarn wound around the rollers.

The spinning and drawing device of the first invention comprises an insulation box having a yarn inlet for introducing yarn and a yarn outlet for outlet of the yarn, and a plurality of heating rollers each housed in the insulation box and feeding the yarn in a yarn running direction from the yarn inlet to the yarn outlet while heating the yarn, the plurality of heating rollers comprising a first heating roller arranged on the most upstream side in the yarn running direction, a second heating roller arranged downstream of the first heating roller in the yarn running direction, having a faster yarn feeding speed and a higher temperature than the first heating roller, and at least one third heating roller arranged between the first heating roller and the second heating roller in the yarn running direction. The thermal insulation box further includes an air guide path having an inlet opening at a position closest to the second heating roller among the plurality of heating rollers in the internal space thereof and an outlet opening at a position closest to the first heating roller among the plurality of heating rollers, the inlet opening being such that at least a portion of the inlet overlaps with an area along the axial direction of the second heating roller when viewed in a direction perpendicular to the axial direction of the second heating roller, and the outlet opening being such that at least a portion of the outlet overlaps with an area along the axial direction of the first heating roller when viewed in a direction perpendicular to the axial direction of the first heating roller.

Low-temperature air from outside flows into the section of the thermal insulation box where the first heating roller is located through the yarn inlet. In addition, the low-temperature yarn introduced from outside is wound around the first heating roller. This means that more energy is consumed to maintain the temperature of the first heating roller. On the other hand, the high-temperature air around the second heating roller flows out of the thermal insulation box through the yarn outlet due to the accompanying flow generated by the rotation of the roller and the running of the yarn wound around the roller, resulting in a large energy loss.

According to the first invention, the hot air that flows along the outer peripheral surface of the second heating roller and is about to flow out of the heat-insulating box due to the accompanying flow can be guided to the induction path. The induction path can then guide the hot air around the second heating roller to the periphery of the first heating roller. This makes it possible to increase the temperature around the first heating roller while suppressing energy loss due to the outflow of hot air to the outside of the heat-insulating box, and to efficiently use thermal energy in the heat-insulating box. In addition, the inlet and outlet of the induction path are opened so that at least a part of them overlaps with the area along the axial direction of the heating roller when viewed in a direction perpendicular to the axial direction of the heating roller. Therefore, the hot air around the second heating roller is guided to the induction path in a direction parallel to the running direction of the yarn, and is further sent to the periphery of the first heating roller in a direction parallel to the running direction of the yarn. This makes it possible to suppress the yarn swaying of the yarn wound around the heating roller.

The spinning and drawing device of the second invention is the first invention, characterized in that the inlet opens at a position closer to the second heating roller than the yarn outlet, and the outlet opens at a position closer to the first heating roller than the yarn inlet.

The air flow is easily disturbed near the entrance and exit of the induction path. If the entrance of the induction path is open at a position close to the yarn outlet, the yarn swaying is likely to occur when the yarn is led out of the insulation box from the yarn outlet. Also, if the exit of the induction path is open at a position close to the yarn inlet, the yarn swaying is likely to occur when the yarn is led into the insulation box from the yarn inlet. According to the second invention, the entrance of the induction path is opened at a position closer to the second heating roller than the yarn outlet, and the exit of the induction path is opened at a position closer to the first heating roller than the yarn inlet. Therefore, it is possible to suppress the occurrence of yarn swaying of the yarn led into the insulation box from the yarn inlet and the yarn swaying of the yarn led out of the insulation box from the yarn outlet. Also, if the entrance of the induction path is opened at a position close to the yarn outlet, a part of the air led into the induction path from the entrance of the induction path may flow out of the insulation box from the yarn outlet due to the accompanying flow generated by the running of the yarn. In the second invention, the entrance of the induction path opens at a position closer to the second heating roller than the yarn outlet, so that it is possible to prevent some of the air that is guided from the entrance of the induction path into the induction path from flowing out of the insulation box through the yarn outlet.

The spinning and drawing device of the third invention is the first or second invention, characterized in that the entire guide path is provided inside the heat-insulating box.

According to the third invention, the air passing through the induction path is kept warm inside the heat-insulating box, so the energy loss of the hot air can be reduced.

The spinning/drawing device of the fourth invention is the first to third inventions, characterized in that the entire circumference of the induction path is surrounded by a wall in a cross section perpendicular to the extension direction of the induction path.

According to the fourth invention, it is possible to prevent the air passing through the induction path from leaking into the heat-retaining box. This makes it possible to efficiently guide the high-temperature air around the first heating roller, and to more efficiently utilize the thermal energy.

The spinning and drawing device of the fifth invention is characterized in that in the first to fourth inventions, the inlet is formed to a size that encompasses the yarn winding area of the outer peripheral surface of the second heating roller in the axial direction of the second heating roller when viewed in a direction perpendicular to the axial direction of the second heating roller.

According to the fifth invention, it becomes easier to equalize the air flow between multiple yarns near the entrance of the induction path. This further reduces yarn swaying near the entrance of the induction path caused by turbulent air flow, and reduces adverse effects on yarn quality.

The spinning and drawing device of the sixth invention is the fifth invention, further comprising a first shielding plate provided in a first spatial region in the internal space of the heat-retaining box that contacts the yarn winding region on the outer circumferential surface of the second heating roller, suppressing the amount of air flowing from the second heating roller toward the yarn outlet and directing the suppressed air to the inlet.

According to the sixth aspect of the invention, the amount of air that flows along the outer circumferential surface of the second heating roller and attempts to flow out of the thermal insulation box can be suppressed. In addition, more of the air that is sent from the upstream side to the downstream side in the yarn running direction by the accompanying flow generated on the outer circumferential surface of the second heating roller can be guided to the induction path. This allows for more efficient use of thermal energy.

The spinning and drawing device of the seventh invention is characterized in that, in the first to sixth inventions, it further comprises a second shielding plate provided in a second spatial region in the internal space of the heat-retaining box that contacts the yarn winding region on the outer circumferential surface of the first heating roller, suppressing the amount of air flowing from the outlet toward the yarn introduction port and directing the suppressed air to the yarn winding region on the outer circumferential surface of the first heating roller.

According to the seventh invention, the high-temperature air guided by the induction path is prevented from flowing out of the thermal insulation box through the yarn inlet, and the air can be guided to the yarn winding area on the outer circumferential surface of the first heating roller. This makes it possible to reduce energy consumption when maintaining the temperature of the first heating roller, and to utilize thermal energy more efficiently.

The eighth invention is a spinning/drawing device according to the first to seventh inventions, characterized in that it further includes a partition plate provided between the first heating roller and the third heating roller.

If the hot air introduced around the first heating roller through the induction path moves to the area around the third heating roller, the third heating roller may become excessively hot, which may impair the quality of the yarn. According to the eighth invention, the partition plate can prevent the hot air around the first heating roller from moving to the area around the third heating roller. This makes it possible to prevent the third heating roller from becoming excessively hot.

The spinning and drawing device of the ninth invention is the seventh invention, characterized in that the inlet opens into the first spatial region that contacts the yarn winding region on the outer circumferential surface of the second heating roller in the internal space of the heat-retaining box, and the outlet opens into the second spatial region.

Air flow is prone to turbulence near the entrance and exit of the induction path. If the entrance and exit of the induction path are open toward the portion of the yarn that is fed in the yarn running direction that is not wound around the heating roller, the air turbulence may cause yarn swaying, which may affect the quality of the yarn. According to the ninth invention, the entrance of the induction path opens into the first spatial region and the exit opens into the second spatial region, so that the occurrence of yarn swaying can be further suppressed.

The spinning/drawing device of the tenth invention is the ninth invention, characterized in that the air passage area of at least a part of the second spatial region downstream of the outlet in the yarn running direction is narrower than the area of the gap between the outlet and the outer circumferential surface of the first heating roller.

In the area where the air passage area is narrow, the flow rate of the accompanying flow generated by the rotation of the first heating roller is faster. As a result, the pressure (static pressure) decreases, making it easier to guide air from the induction path to the first heating roller. In other words, air is more likely to flow into the area where the air passage area is narrow. According to the tenth invention, the air guided around the first heating roller through the induction path is more likely to flow into the area of the second spatial region where the air passage area is narrow, so that a large amount of high-temperature air can be caused to flow into the induction path from the entrance of the induction path, i.e., a large amount of high-temperature air can be guided around the first heating roller. As a result, thermal energy can be used more efficiently.

The spinning and drawing device of the eleventh invention is the tenth invention, characterized in that the size of the gap between the induction path and the outer circumferential surface of the first heating roller, which defines a portion of the air passage area, is 20 to 40 mm.

According to the eleventh invention, it is more effective to narrow the size of the gap between the induction path and the outer peripheral surface of the first heating roller (a value that defines a part of the air passing area) as much as possible within the range of the size that the tip of the suction gun used to suck the yarn when threading the yarn on the heating roller can pass through. In the narrow gap, the flow rate of the accompanying flow generated by the rotation of the first heating roller becomes faster. As a result, the pressure (static pressure) decreases, making it easier to guide air from the induction path to the first heating roller. Therefore, most of the high-temperature air guided through the induction path to the periphery of the first heating roller is sent through the gap to the downstream side in the yarn running direction. For this reason, it is possible to suppress the high-temperature air guided by the induction path from flowing out of the insulation box from the yarn inlet. In addition, by making it easier for air to flow into the gap, more high-temperature air can be flowed into the induction path from the inlet of the induction path, that is, more high-temperature air can be guided to the periphery of the first heating roller. As a result, thermal energy can be used more efficiently.

The spinning and drawing device of the twelfth invention is characterized in that in the first to eleventh inventions, the wall surface on one side of the axial direction of the plurality of heating rollers of the heat-retaining box is a door portion, the plurality of heating rollers are supported on one side by the wall surface on the other side of the axial direction of the plurality of heating rollers, and the distance between the end surface on the one side and the inner surface of the door portion is 9 mm or less.

If the distance between one end face of the heating roller and the door section is large, air will flow between the end face of the heating roller and the door section, making it difficult to efficiently guide the hot air through the induction path. According to the twelfth invention, it becomes difficult for air to enter or exit between the end face of the heating roller and the door section, making it possible to efficiently guide the hot air through the induction path.

In a spinning and drawing device, the aim is to suppress the swaying of the yarn wound around the rollers while efficiently utilizing the thermal energy in the heat-retaining box.

1 is a schematic diagram showing a yarn take-off machine including a yarn drawing device according to an embodiment of the present invention; FIG. 2 is an enlarged view of the spinning and drawing apparatus of FIG. 1 . FIG. 3 is a cross-sectional view taken along line III-III of FIG. FIG. 4 is a diagram showing power consumption of the spinning and drawing devices of the examples and the comparative examples.

(Overall configuration of the spinning take-off machine 1)
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram of a yarn take-up machine 1 according to this embodiment. As shown in Fig. 1, the yarn take-up machine 1 includes a spinning device 2, a spinning drawing device 3, and a yarn winding device 4. Hereinafter, the up, down, left, and right directions on the paper surface of Fig. 1 are referred to as up, down, left, and right directions. In addition, the direction perpendicular to the paper surface of Fig. 1 is referred to as the front-rear direction, and the front side of the paper surface is referred to as the front.

As shown in FIG. 1, the spinning take-up machine 1 is configured to draw multiple yarns Y formed by solidifying molten fiber material such as polyester continuously spun from a spinning device 2 in a spinning drawing device 3 and then wind them up in a yarn winding device 4.

The spinning device 2 continuously spins out molten fiber material such as polyester to produce multiple threads Y. The multiple threads Y spun out from the spinning device 2 are oiled by the oil guide 10 and then sent to the spinning and drawing device 3 via the guide roller 11.

The spinning and drawing device 3 is a device that heats and draws multiple yarns Y, and is located below the spinning device 2. The spinning and drawing device 3 has multiple godet rollers 31 to 35 housed inside an insulation box 20. The spinning and drawing device 3 will be described in detail later.

The multiple yarns Y drawn by the spinning and drawing device 3 are sent to the yarn winding device 4 via a guide roller 12. The yarn winding device 4 is a device that winds multiple yarns Y and is located below the spinning and drawing device 3. The yarn winding device 4 has a bobbin holder 13, a contact roller 14, etc. The bobbin holder 13 has a cylindrical shape extending in the front-rear direction and is rotated by a motor (not shown). Multiple bobbins B are attached to the bobbin holder 13 in a lined-up state in its axial direction. The yarn winding device 4 rotates the bobbin holder 13 to simultaneously wind multiple yarns Y onto multiple bobbins B and produce multiple packages P. The contact roller 14 comes into contact with the surfaces of the multiple packages P to apply a predetermined contact pressure and shape the packages P.

(Spinning and drawing device 3)
Next, the configuration of the spinning and drawing apparatus 3 of this embodiment will be described with reference to Figures 2 and 3. Figure 2 is an enlarged view of the spinning and drawing apparatus 3 of Figure 1. Figure 3 is a cross-sectional view taken along line III-III of Figure 2, with the front side of the page facing upward. The spinning and drawing apparatus 3 has a thermal insulation box 20 and a plurality of (here, five) godet rollers 31 to 35 (heat rollers of the present invention) housed inside the thermal insulation box 20. The thermal insulation box 20 is formed into a box shape by an upper surface portion 21, a right side surface portion 22, a lower right inclined portion 23, a left side surface portion 24, a lower left inclined portion 25, a back surface portion 26 (see Figure 3), and a front surface portion 27 (see Figure 3). A yarn inlet 20a is formed in the lower part of the right side surface 22 of the thermal insulation box 20 to introduce multiple yarns Y into the thermal insulation box 20, and a yarn outlet 20b is formed in the upper part of the right side surface 22 of the thermal insulation box 20 to lead multiple yarns Y out of the thermal insulation box 20. A front surface 27 of the thermal insulation box 20 is attached to the left side surface 24 via a hinge (not shown), and serves as a door that can be opened and closed by swinging back and forth around the hinge. The operation of threading the yarns Y on each of the godet rollers 31 to 35 is performed with the front surface 27 open.

Each godet roller 31-35 is a roller that heats the yarn Y and sends the yarn in the yarn running direction from the yarn inlet 20a to the yarn outlet 20b. Each godet roller 31-35 protrudes toward the front surface 27. In addition, each godet roller 31-35 is arranged in the heat insulation box 20 in order from the upstream side in the yarn running direction. The multiple yarns Y are wound around each godet roller 31-35 in order from the lower godet roller 31 at a winding angle of less than 360 degrees. Each godet roller 31-35 is rotated at a predetermined yarn feed speed by a motor (not shown) (see the arrow of each godet roller 31-35 in FIG. 2 for the rotation direction). In addition, each godet roller 31-35 has a built-in heater (not shown), and the surface of each godet roller 31-35 is heated by the heater.

The three lower godet rollers 31-33 are preheating rollers for preheating the multiple yarns Y before drawing, and the surface temperature of these rollers is set to a temperature (e.g., about 90-100°C) higher than the glass transition point of the yarns Y. On the other hand, the two upper godet rollers 34, 35 are tempering rollers for heat setting the multiple drawn yarns Y, and the surface temperature of these rollers is set to a temperature (e.g., about 150-200°C) higher than the surface temperature of the three lower godet rollers 31-33. In addition, the yarn feed speed of the two upper godet rollers 34, 35 is faster than that of the three lower godet rollers 31-33.

The multiple yarns Y introduced into the heat-retaining box 20 through the yarn inlet 20a are first preheated to a temperature at which they can be stretched while being fed by the godet rollers 31-33. The preheated multiple yarns Y are stretched by the difference in yarn feed speed between the godet rollers 33 and 34. The multiple yarns Y are further heated to a high temperature while being fed by the godet rollers 34 and 35, and the stretched state is heat set. The multiple yarns Y stretched in this way are led out of the heat-retaining box 20 through the yarn outlet 20b.

In this embodiment, the godet roller 31, which is located at the most upstream side in the yarn running direction, corresponds to the first heated roller of the present invention. Air introduced into the thermal insulation box 20 from the yarn inlet 20a is first guided around the godet roller 31, which is the first heated roller. Godet roller 35, which is located downstream of godet roller 31 in the yarn running direction and has a faster yarn feed speed and a higher temperature than godet roller 31, corresponds to the second heated roller of the present invention. And the three godet rollers 32 to 34, which are located between godet roller 31 and godet roller 35, correspond to the third heated roller of the present invention.

Arranged inside the thermal insulation box 20 are flow straightening members 41-45. The flow straightening members 41-45 are plate-shaped members that protrude from the rear surface 26 of the thermal insulation box 20 toward the front surface 27. The flow straightening members 41-45 ensure that the air flowing from the yarn inlet 20a to the yarn outlet 20b of the thermal insulation box 20 is generally aligned with the yarn running direction. There is a small gap between the flow straightening member 45 and the right side surface 22. Providing a gap suppresses the exchange of heat between the low-temperature air outside the thermal insulation box 20 and the high-temperature air inside the thermal insulation box 20. In other words, the flow straightening member 45 functions as a heat insulating member.

In addition, blocking members 51 to 53 are arranged inside the heat insulation box 20. The blocking members 51 to 53 extend toward the outer peripheral surface of the godet roller 34, and their tips are close to the outer peripheral surface of the godet roller 34. The blocking members 51 to 53 block the accompanying flow generated on the outer peripheral surface of the godet roller 34, suppressing the amplification of the accompanying flow inside the heat insulation box 20. This prevents the accompanying flow from moving downstream in the yarn running direction, causing a large amount of heat to escape from the yarn outlet 20b.

Here, the "periphery of the godet roller" refers to the area of a godet roller that is closest to that godet roller than the other godet rollers. In this embodiment, the periphery of each godet roller 31-35 refers to the area surrounded by any one or more of the upper surface 21, right side surface 22, lower right inclined portion 23, left side surface 24, lower left inclined portion 25, flow straightening members 41-45, blocking members 51-53, connecting wall portion 63 described below, and partition plate 73. For example, the periphery of godet roller 31 refers to the area surrounded by the lower right inclined portion 23, connecting wall portion 63 described below, partition plate 73 described below, and flow straightening member 41. Also, for example, the periphery of godet roller 35 refers to the area surrounded by the left side surface 24, upper surface 21, flow straightening member 44, and flow straightening member 43.

Low-temperature air from outside the insulation box 20 of the spinning/drawing device 3 flows into the vicinity of the yarn inlet 20a of the insulation box 20 through the yarn inlet 20a. In addition, low-temperature yarn Y introduced from the outside through the yarn inlet 20a is wound around the godet roller 31 located at the most upstream side in the yarn running direction inside the insulation box 20. For this reason, more energy is consumed to sufficiently maintain the temperature of the yarn Y on the surface of the godet roller 31. On the other hand, the high-temperature air around the godet roller 35 flows out of the insulation box 20 from the yarn outlet 20b due to the accompanying flow generated by the rotation of the yarn Y wound around the godet roller 35, resulting in a large energy loss.

The spinning and drawing device 3 of this embodiment is configured with an induction path 60 to suppress the outflow of high-temperature air from the yarn outlet 20b in the heat-insulating box 20 while suppressing the energy consumption required to maintain the temperature of the yarn Y on the surface of the godet roller 31.

Inside the heat insulation box 20, an air guideway 60 is provided, with an inlet 61 opening at the position closest to the godet roller 35 among the godet rollers 31 to 35, and an outlet 62 opening at the position closest to the godet roller 31 among the godet rollers 31 to 35. As shown in FIG. 2, the inlet 61 opens at a position closer to the godet roller 35 than the yarn outlet 20b, and the outlet 62 opens at a position closer to the godet roller 31 than the yarn inlet 20a.

The induction path 60 includes a part of the left side surface 24 of the thermal insulation box 20, a part of the lower left inclined portion 25, a part of the rear surface 26, and a connecting wall portion 63 that connects the left side surface 24 and the rear surface 26 and the lower left inclined portion 25 and the rear surface 26. As shown in FIG. 3, the connecting wall portion 63 has a part that extends in the left-right direction and a part that extends in the front-rear direction. In a cross section perpendicular to the extension direction of the induction path 60, the induction path 60 is surrounded all around by the left side surface 24 or the lower left inclined portion 25, the rear surface 26, and the connecting wall portion 63. In other words, the induction path 60 has a duct shape with a closed periphery. In this embodiment, the left side surface 24, the lower left inclined portion 25, the rear surface 26, and the connecting wall portion 63 correspond to the walls of the present invention.

The dimensions of the cross section perpendicular to the extension direction of the taxiway 60 except for the vicinity of the entrance 61 are, for example, 16 mm x 155 mm (cross-sectional area is 2480 ^mm2 ). In addition, the cross-sectional area of the taxiway 60 perpendicular to the extension direction increases toward the entrance 61 near the entrance 61, and the area of the entrance 61 is the largest (cross-sectional area is 6300 ^mm2 ). If the cross-sectional area of the cross section perpendicular to the extension direction of the taxiway 60 is too narrow, resistance will increase and air may not flow through the taxiway 60. For this reason, it is preferable that the dimensions of the cross section perpendicular to the extension direction of the taxiway 60 be at least a value such that the cross-sectional area of the cross section is 800 ^mm2 or more.

As shown in FIG. 2, the size of the gap d1 between the connecting wall 63 of the induction path 60 and the outer circumferential surface of the godet roller 31 is 20 to 40 mm. The members constituting the induction path 60 (back surface 26, left side surface 24, lower left inclined portion 25, connecting wall 63) are preferably made of heat insulating materials. This makes it possible to suppress the exchange of thermal energy between the inside and outside of the induction path 60, and to suppress the energy loss of the air passing through the induction path 60.

The entrance 61 of the taxiway 60 is the portion surrounded by the left side portion 24, the back portion 26, and the upper end of the connecting wall portion 63. The exit 62 of the taxiway 60 is the portion surrounded by the lower left inclined portion 25, the back portion 26, and the lower end of the connecting wall portion 63.

The entrance 61 of the induction path 60 opens so as to overlap with the area along the front-rear direction, which is the axial direction of the godet roller 35, when viewed in a direction perpendicular to the axial direction (front-rear direction) of the godet roller 35 (in this embodiment, the vertical direction) (see Figures 2 and 3). The exit 62 of the induction path 60 opens so as to overlap with the area along the front-rear direction, which is the axial direction of the godet roller 31, when viewed in a direction perpendicular to the axial direction (front-rear direction) of the godet roller 31 (in this embodiment, a direction tilted to the left of the vertical direction, i.e., the extension direction of the induction path 60). Note that the "area along the front-rear direction, which is the axial direction of the godet roller" refers to the space around the godet roller from the front end face to the rear end face of the godet roller when viewed from the vertical or horizontal direction.

3, the entrance 61 is formed to a size that includes the winding area W of the yarn Y on the outer surface of the godet roller 35 in the front-rear direction, which is the axial direction of the godet roller 35. The "winding area W" refers to the range in which multiple yarns Y are wound on the outer surface of the godet roller. Specifically, for example, the winding area W of the godet roller 35 is the range from the upstream contact point of the yarn Y on the outer surface of the godet roller 35 to the downstream contact point in the yarn running direction when viewed in the front-rear direction (see FIG. 2), and is the range from the point where the frontmost yarn Y is wound on the outer surface of the godet roller 35 to the point where the rearmost yarn Y is wound on when viewed in the yarn running direction (see FIG. 3).

2, the inlet 61 opens into a first spatial region 80A that contacts the winding area W of the yarn Y on the outer circumferential surface of the godet roller 35 in the internal space of the heat insulation box 20. The outlet 62 opens into a second spatial region 80B that contacts the winding area W of the yarn Y on the outer circumferential surface of the godet roller 31 in the internal space of the heat insulation box 20. The "first spatial region 80A" refers to a space that contacts the winding area W of the yarn Y on the outer circumferential surface of the godet roller 35 in the internal space of the heat insulation box 20, that is radially outside the godet roller 35 relative to the winding area W of the yarn Y on the outer circumferential surface of the godet roller 35, and that is closer to the godet roller 35 than the other godet rollers. The "second spatial region 80B" refers to a space in contact with the yarn Y winding area W on the outer circumferential surface of the godet roller 31 in the internal space of the heat insulation box 20, a space radially outward of the godet roller 31 than the yarn Y winding area W on the outer circumferential surface of the godet roller 31, and a space closer to the godet roller 31 than the other godet rollers. Also, the second spatial region 80B is a part of the region downstream of the outlet 62 in the yarn running direction, and the air passage area defined by the above-mentioned gap size d1 is narrower than the area of the gap between the outlet 62 and the outer circumferential surface of the godet roller 31.

As shown in FIG. 2, the spinning and drawing device 3 further includes a first shielding plate 71, a second shielding plate 72, and a partition plate 73.

The first shielding plate 71 is provided in the first spatial region 80A and is a member that suppresses the amount of air flowing from the godet roller 35 toward the yarn outlet 20b and guides the suppressed air to the inlet 61. The first shielding plate 71 is provided for the godet roller 35 and extends from the left side surface 24 toward a portion of the winding region W of the godet roller 35 that is downstream in the yarn running direction from the inlet 61 of the guide path 60. The tip of the first shielding plate 71 is close to the outer peripheral surface of the godet roller 35. The first shielding plate 71 may be provided entirely in the first spatial region 80A, or a portion of it may be provided in the first spatial region 80A. When a part of the first shielding plate 71 is provided in the first spatial region 80A, for example, the remaining part of the first shielding plate 71 may be provided in a spatial region that contacts at least one of a region on the front end face side and a region on the rear end face side of the godet roller 35 relative to the winding region W of the outer circumferential surface of the godet roller 35 when viewed in a direction perpendicular to the axial direction of the godet roller 35. In addition, as another example of a case where a part of the first shielding plate 71 is provided in the first spatial region 80A, the remaining part of the first shielding plate 71 may be provided in a region on the outer circumferential surface of the godet roller 35 downstream in the yarn running direction relative to the winding region W of the yarn Y when viewed in the axial direction of the godet roller 35. Furthermore, it goes without saying that the remaining portion of the first shielding plate 71 may be provided in a spatial region that is in contact with at least one of the regions on the front end face side and the rear end face side of the outer peripheral surface of the godet roller 35 from the winding region W when viewed in a direction perpendicular to the axial direction of the godet roller 35, and may also be provided in a region downstream in the yarn running direction from the winding region W of the yarn Y on the outer peripheral surface of the godet roller 35 when viewed in the axial direction of the godet roller 35.

It is preferable that the tip of the first shielding plate 71 faces the outer peripheral surface of the godet roller 35. This allows a larger amount of air flowing along the outer peripheral surface of the godet roller 35 and flowing out of the heat insulation box 20 to be shielded. In addition, it is preferable that the tip of the first shielding plate 71 is located above the base end on the left side surface 24 side. This makes it easier to guide the air sent from the upstream side to the downstream side in the yarn running direction by the accompanying flow generated on the outer peripheral surface of the godet roller 35 to the induction path 60. In this embodiment, the first shielding plate 71 extends toward the outer peripheral surface of the lower semicircular part of the godet roller 35 when viewed from the front-rear direction. And, as shown in FIG. 2, the tip of the first shielding plate 71 faces the outer peripheral surface of the godet roller 35, and the tip of the first shielding plate 71 is located above the base end. The size of the gap between the tip of the first shielding plate 71 and the outer peripheral surface of the godet roller 35 is about 2 mm.

The second shielding plate 72 is provided in the second spatial region 80B and is a member that suppresses the amount of air flowing from the outlet 62 toward the yarn inlet 20a and guides the suppressed air to the yarn Y winding area W on the outer circumferential surface of the godet roller 31. The second shielding plate 72 is provided for the godet roller 31 and extends from the lower right inclined portion 23 toward the part of the winding area W of the godet roller 31 that is upstream of the outlet 62 of the guide path 60 in the yarn running direction. The size of the gap between the tip of the second shielding plate 72 and the outer circumferential surface of the godet roller 31 is approximately 2 mm. The entire second shielding plate 72 may be provided in the second spatial region 80B, or a part of it may be provided in the second spatial region 80B. When a part of the second shielding plate 72 is provided in the second spatial region 80B, for example, the remaining part of the second shielding plate 72 may be provided in a spatial region that contacts at least one of a region on the front end face side and a region on the rear end face side of the godet roller 31 from the winding region W of the outer circumferential surface of the godet roller 31 when viewed in a direction perpendicular to the axial direction of the godet roller 31. In addition, as another example when a part of the second shielding plate 72 is provided in the second spatial region 80B, the remaining part of the second shielding plate 72 may be provided in a region on the outer circumferential surface of the godet roller 31 upstream in the yarn running direction from the winding region W of the yarn Y when viewed in the axial direction of the godet roller 31. Furthermore, it goes without saying that the remaining portion of the second shielding plate 72 may be provided in a spatial region that is in contact with at least one of the regions on the front end face side and the rear end face side of the outer peripheral surface of the godet roller 31 from the winding region W when viewed in a direction perpendicular to the axial direction of the godet roller 31, and may be provided in a region upstream in the yarn running direction from the winding region W of the yarn Y on the outer peripheral surface of the godet roller 31 when viewed in the axial direction of the godet roller 31.

The partition plate 73 is provided between the godet roller 31 and the godet roller 33. The partition plate 73 is a plate-shaped member that protrudes from the rear surface 26 toward the front surface 27 and extends from the connecting wall portion 63 of the guide path 60 toward the outer circumferential surface of the godet roller 32. The tip of the partition plate 73 is close to the outer circumferential surface of the godet roller 32.

Furthermore, in this embodiment, the distance d2 (see FIG. 3) between the front end faces of the godet rollers 31-35 supported on one side by the rear portion 26 and the inner surface of the front portion 27, which is an openable and closable door portion, is 9 mm or less.

(Example)
Next, the power consumption (kW) of the heater accompanying heating of the yarn Y by the godet rollers 31 to 35 was compared for the spinning and drawing apparatus 3 of the comparative example, example 1, and example 2. Comparative example 1 is a spinning and drawing apparatus 3 having no induction path 60. Example 1 is a spinning and drawing apparatus 3 in which the induction path 60, the first shielding plate 71, the second shielding plate 72, and the partition plate 73 are arranged inside the heat insulation box 20, and is the spinning and drawing apparatus 3 of the above embodiment. Example 2 is a spinning and drawing apparatus 3 in which the induction path 60, the first shielding plate 71, and the partition plate 73 are arranged inside the heat insulation box 20, and is a spinning and drawing apparatus 3 having a configuration in which the second shielding plate 72 of the above embodiment is not arranged. The surface temperatures of each of the godet rollers 31 to 35 are similar in the comparative example, example 1, and example 2.

As shown in FIG. 4, the power consumption of the spinning and drawing device 3 of the comparative example was 3.69 kW. In contrast, the power consumption of the spinning and drawing device 3 of Example 1 was 2.87 kW, and the power consumption of the spinning and drawing device 3 of Example 2 was 3.16 kW, which shows that the power consumption was reduced compared to the comparative examples. In particular, it was found that the power consumption was reduced more significantly in the spinning and drawing device 3 of Example 1, in which the second shielding plate 72 was provided.

(effect)
The spinning and drawing apparatus 3 of the present embodiment includes an insulation box 20 having a yarn inlet 20a and a yarn outlet 20b, and godet rollers 31 to 35 housed in the insulation box 20. The godet rollers 31 to 35 include a godet roller 31 (first heating roller) arranged on the most upstream side in the yarn running direction, a godet roller 35 (second heating roller) arranged downstream of the godet roller 31 in the yarn running direction, a godet roller 35 having a higher yarn feed speed and a higher temperature than the godet roller 31, and godet rollers 32 to 34 (third heating rollers) arranged between the godet roller 31 and the godet roller 35 in the yarn running direction. The insulation box 20 further includes an air guide path 60 having an inlet 61 opening at a position closest to the godet roller 35 among the godet rollers 31 to 35 in the internal space thereof and an outlet 62 opening at a position closest to the godet roller 31 among the godet rollers 31 to 35. The inlet 61 opens so as to overlap with a region along the axial direction of the godet roller 35 when viewed in a direction perpendicular to the axial direction (front-to-back direction) of the godet roller 35, and the outlet 62 opens so as to overlap with a region along the axial direction of the godet roller 31 when viewed in a direction perpendicular to the axial direction (front-to-back direction) of the godet roller 31.

Outside low-temperature air flows into the portion of the heat insulation box 20 where the godet roller 31 is arranged through the yarn inlet 20a. In addition, the low-temperature yarn Y introduced from the outside is wound around the godet roller 31. For this reason, more energy is consumed to maintain the temperature of the godet roller 31. On the other hand, the high-temperature air around the godet roller 35 flows out of the heat insulation box 20 from the yarn outlet 20b due to the accompanying flow generated by the rotation of the roller and the running of the yarn Y wound around the roller, resulting in a large energy loss. According to this embodiment, the high-temperature air that flows along the outer peripheral surface of the godet roller 35 and is about to flow out of the heat insulation box 20 due to the accompanying flow can be guided to the induction path 60. And the induction path 60 can guide the high-temperature air around the godet roller 35 to the periphery of the godet roller 31. This makes it possible to increase the temperature of the air around the godet roller 31 while suppressing energy loss due to the outflow of high-temperature air to the outside of the thermal insulation box 20, and to efficiently use thermal energy in the thermal insulation box 20. In addition, the inlet 61 opens so as to overlap with the area along the axial direction of the godet roller 35 when viewed in a direction perpendicular to the axial direction of the godet roller 35, and the outlet 62 opens so as to overlap with the area along the axial direction of the godet roller 31 when viewed in a direction perpendicular to the axial direction of the godet roller 31. Therefore, the high-temperature air around the godet roller 35 is guided to the guide path 60 in a direction parallel to the running direction of the yarn Y, and is further sent to the periphery of the godet roller 31 in a direction parallel to the running direction of the yarn Y. This makes it possible to suppress the axial (front-back) swaying of the yarn Y wound around the outer circumferential surfaces of the godet roller 31 and the godet roller 35, and as a result, the deterioration of the quality of the yarn Y can be suppressed.

In addition, in this embodiment, the entrance 61 opens at a position closer to the godet roller 35 than the yarn outlet 20b, and the exit 62 opens at a position closer to the godet roller 31 than the yarn inlet 20a. Air flow is likely to be disturbed near the entrance 61 and exit 62 of the induction path 60. If the entrance 61 of the induction path 60 opens at a position closer to the yarn outlet 20b, the yarn Y that is led out from the yarn outlet 20b to the outside of the heat insulation box 20 is likely to sway. If the exit 62 of the induction path 60 opens at a position closer to the yarn inlet, the yarn Y that is led into the heat insulation box 20 from the yarn inlet 20a is likely to sway. According to this embodiment, the entrance 61 of the induction path 60 opens at a position closer to the godet roller 35 than the yarn outlet 20b, and the exit 62 of the induction path 60 opens at a position closer to the godet roller 31 than the yarn inlet 20a. Therefore, it is possible to suppress the occurrence of yarn swaying of the yarn Y introduced into the heat insulation box 20 from the yarn inlet 20a and the yarn swaying of the yarn Y discharged to the outside of the heat insulation box 20 from the yarn outlet 20b. In addition, if the entrance 61 of the induction path 60 is opened at a position close to the yarn outlet 20b, some of the air guided from the entrance 61 of the induction path 60 to the induction path 60 may flow out from the yarn outlet 20b to the outside of the heat insulation box 20 due to the accompanying flow generated by the running of the yarn Y. In this embodiment, since the entrance 61 of the induction path 60 is opened at a position closer to the godet roller 35 than the yarn outlet 20b, it is possible to suppress the outflow of some of the air guided from the entrance 61 of the induction path 60 to the induction path 60 from the yarn outlet 20b to the outside of the heat insulation box 20.

In addition, in this embodiment, the entire induction path 60 is provided inside the heat-insulating box 20. According to this embodiment, the air passing through the induction path 60 is kept warm inside the heat-insulating box 20, so the energy loss of the high-temperature air can be reduced.

In addition, in this embodiment, in a cross section perpendicular to the extension direction of the induction path 60, the induction path 60 is surrounded all around by the left side portion 24, the left lower inclined portion 25, the back portion 26, and the connecting wall portion 63. According to this embodiment, it is possible to prevent air passing through the induction path 60 from leaking into the heat insulation box 20 along the way. Therefore, the high-temperature air can be efficiently guided around the godet roller 31, and thermal energy can be utilized more efficiently.

Furthermore, in this embodiment, the entrance 61 is formed to a size that encompasses the winding area W of the yarn Y on the outer surface of the godet roller 35 in the axial direction (front-rear direction) of the godet roller 35 when viewed in a direction perpendicular to the axial direction (front-rear direction) of the godet roller 35. According to this embodiment, the air flow near the entrance 61 of the induction path 60 can be easily made uniform among multiple yarns Y. This can further suppress the occurrence of yarn swaying near the entrance 61 of the induction path 60 due to turbulent air flow, and can suppress adverse effects on the quality of the yarn Y.

In addition, in this embodiment, a first shielding plate 71 is further provided in the first spatial region 80A in contact with the yarn Y winding region W on the outer circumferential surface of the godet roller 35 in the internal space of the heat insulation box 20, which suppresses the amount of air flowing from the godet roller 35 toward the yarn outlet 20b and guides the suppressed air to the inlet 61 of the induction path 60. According to this embodiment, the amount of air that flows along the outer circumferential surface of the godet roller 35 and attempts to flow out of the heat insulation box 20 can be suppressed. In addition, more air that is sent from the upstream side to the downstream side in the yarn running direction by the accompanying flow generated on the outer circumferential surface of the godet roller 35 can be guided to the induction path 60. This allows for more efficient use of thermal energy.

In addition, in this embodiment, a second shielding plate 72 is provided in the second spatial region 80B in the internal space of the heat insulation box 20, which is in contact with the yarn Y winding region W on the outer circumferential surface of the godet roller 31, and suppresses the amount of air flowing from the outlet 62 of the guide path 60 toward the yarn inlet 20a and guides the suppressed air to the yarn Y winding region on the outer circumferential surface of the godet roller 31. According to this embodiment, it is possible to suppress the high-temperature air guided by the guide path 60 from flowing out of the heat insulation box from the yarn inlet 20a, and further to guide the air to the yarn Y winding region W on the outer circumferential surface of the godet roller 31. This makes it possible to further suppress energy consumption when maintaining the temperature of the godet roller 31, and to utilize thermal energy more efficiently.

In addition, in this embodiment, a partition plate 73 is further provided between the godet roller 31 and the godet roller 33. Around the godet roller 33, there is air that has been heated inside the heat insulation box 20, and the godet roller 33 is wound with the yarn Y that has already reached a high temperature. If the high-temperature air that has been guided around the godet roller 31 through the guide path 60 moves around such a godet roller 33, the godet roller 33 may become excessively hot, which may damage the quality of the yarn. According to this embodiment, the partition plate 73 can prevent the high-temperature air around the godet roller 31 from moving around the godet roller 33. This makes it possible to prevent the godet roller 33 from becoming excessively hot.

In addition, in this embodiment, the entrance 61 of the induction path 60 opens to the first spatial area 80A that contacts the winding area W of the yarn Y on the outer surface of the godet roller 35 in the internal space of the heat insulation box 20, and the exit 62 opens to the second spatial area 80B that contacts the winding area W of the yarn Y on the outer surface of the godet roller 31 in the internal space of the heat insulation box 20. Air flow is likely to be disturbed near the entrance 61 and exit 62 of the induction path 60. If the entrance 61 and exit 62 of the induction path 60 open toward the part of the yarn Y that is sent in the yarn running direction that is not wound around the godet roller, the air disturbance may cause yarn swaying, which may affect the quality of the yarn Y. According to this embodiment, the entrance 61 of the induction path 60 opens to the first spatial area 80A, and the exit 62 opens to the second spatial area 80B, so that the occurrence of yarn swaying can be further suppressed.

In addition, in this embodiment, the air passage area of at least a part of the area downstream of the outlet 62 in the yarn running direction in the second spatial region 80B is narrowed relative to the area of the gap between the outlet 62 and the outer circumferential surface of the godet roller 31. In the area where the air passage area is narrow, the flow rate of the accompanying flow generated by the rotation of the godet roller 31 becomes faster. As a result, the pressure (static pressure) decreases, making it easier to guide air from the induction path 60 to the godet roller 31. In other words, air is more likely to flow into the area where the air passage area is narrow. According to this embodiment, the air guided around the godet roller 31 through the induction path 60 is more likely to flow into the area where the air passage area is narrow, so that a lot of high-temperature air can be flowed into the induction path 60 from the inlet 61 of the induction path 60, that is, a lot of high-temperature air can be guided around the godet roller 31. As a result, thermal energy can be used more efficiently.

Furthermore, in this embodiment, the size d1 of the gap between the induction path 60 and the outer peripheral surface of the godet roller 31, which determines a part of the air passing area, is 20 to 40 mm. According to this embodiment, the size of the gap between the induction path 60 and the outer peripheral surface of the godet roller 31 (the value that determines a part of the air passing area) can be made as narrow as possible within the range of the size that the tip of the suction gun used for sucking the yarn Y when threading the godet roller 31 can pass through. In the narrow gap, the flow rate of the accompanying flow generated by the rotation of the godet roller 31 becomes faster. As a result, the pressure (static pressure) decreases, making it easier to guide air from the induction path 60 to the godet roller 31. Therefore, most of the high-temperature air guided around the godet roller 31 through the induction path 60 is sent downstream in the yarn running direction through the above gap. Therefore, it is possible to suppress the high-temperature air guided by the induction path 60 from flowing out of the insulation box 20 from the yarn inlet 20a. In addition, by making it easier for air to flow into the gap, more hot air can be introduced into the induction path 60 from the inlet 61 of the induction path 60, i.e., more hot air can be guided around the godet roller 31. As a result, thermal energy can be used more efficiently.

In addition, in this embodiment, the front portion 27 of the heat insulation box 20 is a door portion that can be opened and closed, the godet rollers 31 to 35 are supported on one side by the back portion 26, and the distance d2 between the front end face and the inner surface of the front portion 27 is 4 mm or less. If the distance between the front end faces of the godet rollers 31 to 35 and the front portion 27 is large, air will flow between the front end faces of the godet rollers 31 to 35 and the front portion 27, and the induction of high-temperature air by the induction path 60 cannot be performed efficiently. According to this embodiment, it is difficult for air to enter and exit between the front end faces of the godet rollers 31 to 35 and the front portion 27, so the induction of high-temperature air by the induction path 60 can be performed efficiently.

(Modification)
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these examples, and various modifications are possible within the scope of the claims. Below, modifications of the above-described embodiments will be described. However, parts having the same configuration as the above-described embodiments will be given the same reference numerals and their description will be omitted as appropriate.

In the above embodiment, the guide path 60 guides the air around the godet roller 35 to the periphery of the godet roller 31 without guiding it to the periphery of the godet rollers 32 to 34. However, for example, the air around the godet roller 34 may be guided to the periphery of the godet roller 31 without guiding it to the godet rollers 32 and 33. In this case, the godet roller 34, which is arranged downstream in the yarn running direction from the godet roller 31 corresponding to the first heating roller, has a faster yarn sending speed and a higher temperature than the godet roller 31, corresponds to the second heating roller. In addition, the godet rollers 32 and 33 arranged between the godet roller 31 and the godet roller 34 correspond to the third heating roller.

In the above embodiment, the induction path 60 includes a part of the left side surface 24 of the heat insulation box 20, a part of the lower left inclined portion 25, a part of the back surface 26, and a connecting wall portion 63 connecting the left side surface 24 and the back surface 26 and the lower left inclined portion 25 and the back surface 26. In a cross section perpendicular to the extension direction of the induction path 60, the induction path 60 is surrounded by the left side surface 24 or the lower left inclined portion 25, the back surface 26, and the connecting wall portion 63. However, the induction path 60 may also include a part of the left side surface 24 of the heat insulation box 20, a part of the lower left inclined portion 25, a part of the back surface 26, a part of the front surface 27, a plate-shaped member extending from the back surface 26 toward the front surface 27, and a sealing member attached to the front end of the plate-shaped member. The sealing member is disposed in the gap between the plate-shaped member and the front surface 27. In this case, in a cross section perpendicular to the direction in which the guideway 60 extends, the guideway 60 is surrounded by the left side surface 24 or the left lower inclined portion 25, the back surface 26, the front surface 27, the plate-like member, and the seal member. In this case, a part of the entrance 61 opens so as to overlap with the area along the axial direction of the godet roller 35 when viewed in a direction perpendicular to the axial direction of the godet roller 35, and a part of the exit 62 opens so as to overlap with the area along the axial direction of the godet roller 31 when viewed in a direction perpendicular to the axial direction of the godet roller 31.

Furthermore, the sealing members may be attached to the front ends of the first shielding plate 71, the second shielding plate 72, the partition plate 73, the straightening members 41-45, and the blocking members 51-53. This eliminates gaps between the first shielding plate 71, the second shielding plate 72, the partition plate 73, the straightening members 41-45, and the blocking members 51-53 and the front part 27 in the closed state. This blocks air that tries to pass through the gaps, and prevents unintended airflow from occurring in the internal space of the thermal insulation box 20. Note that the sealing members do not have to be attached to all of the front ends of the first shielding plate 71, the second shielding plate 72, the partition plate 73, the straightening members 41-45, and the blocking members 51-53, and may be attached to at least one or more locations.

In addition, in a cross section perpendicular to the extension direction of the induction path 60, the induction path 60 does not have to be surrounded by a wall on the entire periphery. For example, the induction path 60 may be configured to include the left side portion 24 of the heat insulation box 20, the left lower inclined portion 25, the back portion 26, and a plate-like member protruding from the back portion 26 toward the front portion 27. In this case, the induction path 60 has a shape in which the front side is not surrounded by a wall on a cross section perpendicular to the extension direction.

In the above embodiment, the induction path 60 is disposed inside the heat insulation box 20, but it may be disposed outside the heat insulation box 20. In this case, the induction path 60 is a heat insulating member and has a duct shape with a closed periphery.

In the above embodiment, the size of the gap between the tip of the second shielding plate 72 and the outer peripheral surface of the godet roller 31 is about 2 mm. However, the size of the gap between the tip of the second shielding plate 72 and the outer peripheral surface of the godet roller 31 may be greater than about 2 mm. The second shielding plate 72 prevents the high-temperature air guided around the godet roller 31 by the guide path 60 from flowing out of the heat-insulating box through the yarn inlet 20a, and also serves to shield the low-temperature air introduced into the heat-insulating box 20 through the yarn inlet 20a. If the tip of the second shielding plate 72 is too close to the outer peripheral surface of the godet roller 31, more high-temperature air will be accumulated inside the heat-insulating box 20. In this case, the temperature of the air around the godet rollers 32 to 35 located downstream of the godet roller 31 in the yarn running direction may become higher than expected. If this happens, the surface temperature of the godet rollers 32 to 35 may become too high, which may affect the quality of the yarn Y. In this case, it is necessary to allow low-temperature air to flow into the heat-insulating box 20 from the yarn inlet 20a. Therefore, it is preferable that the distance between the tip of the second shielding plate 72 and the outer circumferential surface of the godet roller 31 is set to a value that can best prevent the air guided around the godet roller 31 by the guide path 60 from flowing out of the heat-insulating box through the yarn inlet 20a, within a range in which the surface temperatures of the godet rollers 32 to 35 do not become too high. The size of the gap between the tip of the second shielding plate 72 and the outer circumferential surface of the godet roller 31 is adjusted, for example, between 2 mm and 35 mm.

The spinning and drawing device of the present invention may also be provided with a second shielding plate drive device that moves the second shielding plate 72 to adjust the distance between the tip of the second shielding plate 72 and the outer circumferential surface of the godet roller 31. In this case, the distance between the tip of the second shielding plate 72 and the outer circumferential surface of the godet roller 31 is automatically adjusted according to the temperature inside the heat insulation box 20 and the surface temperature of each godet roller. This makes it possible to prevent the temperature of the air around the godet rollers 32 to 35, which are downstream of the godet roller 31 in the yarn running direction, from becoming higher than expected.

In the above embodiment, the first shielding plate 71 may be movable between a close position close to the outer peripheral surface of the godet roller 35 and a retracted position farther from the outer peripheral surface of the godet roller 35 than the close position. The second shielding plate 72 may be movable between a close position close to the outer peripheral surface of the godet roller 31 and a retracted position farther from the outer peripheral surface of the godet roller 31 than the close position. The shielding members 51 and 52 may be movable between a close position close to the outer peripheral surface of the godet roller 34 and a retracted position farther from the outer peripheral surface of the godet roller 34 than the close position. In this case, for example, when threading the yarn Y on the godet roller, the first shielding plate 71, the second shielding plate 72, and the shielding members 51 and 52 can be moved to the retracted position to temporarily separate each member from the godet roller 35, making it easier to thread the yarn on the godet roller.

In the above embodiment, any one or more of the first shielding plate 71, the second shielding plate 72, and the partition plate 73 may not be provided.

In the above embodiment, a sliding shutter may be attached to the entrance 61 of the taxiway 60. The area of the entrance 61 varies as the shutter slides along the entrance 61. This makes it possible to adjust the flow rate of air flowing into the taxiway 60. The shutter may be slid manually by an operator, or automatically by a shutter drive device for moving the shutter.

1 Spinning take-off machine 3 Spinning and drawing device 20 Heat-insulating box 20a Yarn inlet 20b Yarn outlet 24 Left side surface (wall)
25 Lower left slope (wall)
26 Back part (wall part)
31 Godet roller (first heating roller)
32 Godet roller (third heating roller)
33 Godet roller (third heating roller)
34 Godet roller (third heating roller)
35 Godet roller (second heating roller)
60 Taxiway 61 Entrance 62 Exit 63 Connecting wall (wall)
71 First shielding plate 72 Second shielding plate 73 Partition plate 80A First spatial region 80B Second spatial region

Claims (12)

an insulation box having a yarn inlet for introducing the yarn and a yarn outlet for discharging the yarn;
a plurality of heating rollers each housed in the thermal insulation box and configured to feed the yarn in a yarn running direction from the yarn inlet to the yarn outlet while heating the yarn,
the plurality of heating rollers include a first heating roller arranged on the most upstream side in the yarn running direction, a second heating roller arranged on the downstream side of the first heating roller in the yarn running direction, having a faster yarn feeding speed and a higher temperature than the first heating roller, and at least one third heating roller arranged between the first heating roller and the second heating roller in the yarn running direction,
an air guide path having an inlet opening at a position closest to the second heating roller among the plurality of heating rollers in the internal space of the heat insulation box and an outlet opening at a position closest to the first heating roller among the plurality of heating rollers,
the inlet is open so that at least a portion of the inlet overlaps with a region along the axial direction of the second heating roller when viewed in a direction perpendicular to the axial direction of the second heating roller, and
the outlet is opened so that at least a portion of the outlet overlaps with a region along the axial direction of the first heating roller when viewed in a direction perpendicular to the axial direction of the first heating roller. The spinning and drawing device according to claim 1, characterized in that the inlet opens at a position closer to the second heating roller than the yarn outlet, and the outlet opens at a position closer to the first heating roller than the yarn inlet. The spinning and drawing device according to claim 1 or 2, characterized in that the entire induction path is provided inside the heat-insulating box. The spinning and drawing device according to any one of claims 1 to 3, characterized in that in a cross section perpendicular to the extension direction of the induction path, the induction path is entirely surrounded by a wall portion. The spinning and drawing device according to any one of claims 1 to 4, characterized in that the inlet is formed to a size that includes the yarn winding area on the outer circumferential surface of the second heating roller in the axial direction of the second heating roller when viewed in a direction perpendicular to the axial direction of the second heating roller. The spinning and drawing device according to claim 5, further comprising a first shielding plate provided in a first spatial region in the internal space of the heat-retaining box that contacts the yarn winding region on the outer circumferential surface of the second heating roller, which suppresses the amount of air flowing from the second heating roller toward the yarn outlet and guides the suppressed air to the inlet. The spinning and drawing device according to any one of claims 1 to 6, further comprising a second shielding plate provided in a second spatial region in the internal space of the heat-retaining box that contacts the yarn winding region on the outer circumferential surface of the first heating roller, which suppresses the amount of air flowing from the outlet toward the yarn introduction port and guides the suppressed air to the yarn winding region on the outer circumferential surface of the first heating roller. The spinning and drawing device according to any one of claims 1 to 7, further comprising a partition plate provided between the first heating roller and the third heating roller. the inlet is open to a first spatial region in the internal space of the heat-retaining box, the first spatial region being in contact with a region around the outer circumferential surface of the second heating roller around which the yarn is wound;
The fiber drawing apparatus according to claim 7, wherein the outlet opens into the second spatial region. The spinning and drawing device according to claim 9, characterized in that the air passage area of at least a part of the second spatial region downstream of the outlet in the yarn running direction is narrower than the area of the gap between the outlet and the outer circumferential surface of the first heating roller. The spinning and drawing device according to claim 10, characterized in that the size of the gap between the induction path and the outer circumferential surface of the first heating roller, which defines a portion of the air passage area, is 20 to 40 mm. a wall surface of the heat-retaining box on one side in the axial direction of the plurality of heating rollers is a door portion,
The spinning drawing apparatus according to any one of claims 1 to 11, characterized in that the plurality of heating rollers are supported on one side by a wall surface on the other side in the axial direction of the plurality of heating rollers, and a distance between an end surface on the one side and an inner surface of the door portion is 9 mm or less.

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