JP2022020895A - Air spinning device, air spinning machine and spinning method - Google Patents

Abstract

To provide an air spinning device capable of spinning spun yarns of high quality.SOLUTION: An air spinning device 4 imparts a twist to a fiber bundle F by a swirling air flow to generate spun yarns Y. The air spinning device 4 comprises: a fiber guide 41a; a nozzle block 41b; and a nozzle head 41c. The fiber guide 41a guides the fiber bundle F. The nozzle block 41b has formed therein a nozzle through which compressed air for generating the swirling air flow acting on the fiber bundle F guided by the fiber guide 41a passes. In the nozzle head 41c, an inflow chamber 7 for spinning the fiber bundle F is formed. The inflow chamber 7 has a part in which, when the inflow chamber 7 is cut perpendicular to the running direction of the spun yarns Y, the diameter of a circle in the cut face is 25 to 36 mm.SELECTED DRAWING: Figure 3

Description

The present invention mainly relates to an air spinning apparatus that spins using air.

Conventionally, an air spinning device that twists a fiber by the action of a swirling air flow formed in a spinning chamber to generate a spun yarn has been known. Patent Document 1 discloses this type of air spinning apparatus.

The air spinning apparatus of Patent Document 1 is provided with a nozzle cap for fixing the fiber guide and the nozzle block to the nozzle holder, thereby preventing the fiber guide and the nozzle block from shifting in the mounting position, thereby causing variations in the shape of the spinning chamber. It is configured to reduce.

Japanese Unexamined Patent Publication No. 2012-12709

An object of the present invention is to provide an air spinning apparatus capable of spinning higher quality spun yarn, an air spinning machine equipped with the air spinning apparatus, and a spinning method using the air spinning apparatus.

Means and effects to solve problems

According to the first aspect of the present invention, an air spinning device having the following configuration is provided. That is, this air spinning device twists the fiber bundle by a swirling air flow to generate a yarn. This air spinning device includes a fiber guide, a nozzle block, and an inflow chamber forming block. The fiber guide guides the fiber bundle. The nozzle block is formed with a nozzle through which compressed air for generating a swirling air flow acting on the fiber bundle guided by the fiber guide passes. The inflow chamber forming block is formed with an inflow chamber into which the swirling air flow flows. The inflow chamber has a portion in which the diameter of the circle of the cut surface is 25 mm or more and 36 mm or less when the inflow chamber is cut perpendicular to the traveling direction of the yarn.

This makes it possible to construct an inflow chamber in which fiber waste can be easily collected. As a result, each fiber contained in the fiber bundle can be swirled smoothly by the action of the swirling air flow, and high quality yarn can be produced.

In the air spinning apparatus, the inflow chamber preferably has a portion in which the diameter of the circle of the cut surface is 28 mm or more and less than 34 mm when the inflow chamber is cut perpendicular to the traveling direction of the yarn.

This makes it easier to collect fiber debris.

The above-mentioned air spinning apparatus preferably has the following configuration. That is, the length of the inflow chamber in the traveling direction of the yarn is 38% or more and 75% or less of the diameter of the inflow chamber.

Thereby, an inflow chamber having a suitable shape can be realized.

In the air spinning apparatus, the length of the inflow chamber in the traveling direction of the yarn is preferably 14 mm or more and 25 mm or less.

Thereby, an inflow chamber having an appropriate size can be formed.

In the air spinning apparatus, the inflow chamber is preferably connected to an exhaust passage for discharging the swirling air flow through a connection opening formed in the inflow chamber forming block.

As a result, the air in the inflow chamber can be discharged. In addition, the fiber waste collected in the inflow chamber can be easily discharged.

The above-mentioned air spinning apparatus preferably has the following configuration. That is, in the connection opening, the distance between the end portion located on one side in the circumferential direction of the inflow chamber and the end portion located on the other side in the circumferential direction is smaller than the diameter of the inflow chamber.

As a result, the air in the inflow chamber can be discharged to the outside in a compact configuration.

In the air spinning apparatus, when the inflow chamber is cut perpendicular to the traveling direction of the yarn at a place where the connection opening is not formed, the diameter of the circle of the cut surface is 25 mm or more and 36 mm or less. It is preferable to have a portion.

This makes it possible to keep the size of the inflow chamber within an appropriate range.

In the air spinning apparatus, it is preferable that the diameter of the circle of the cut surface of the inflow chamber increases as the distance from the fiber guide increases.

As a result, the compressed air injected from the nozzle of the nozzle block can be smoothly discharged.

The air spinning device preferably has the following configuration. That is, when the inflow chamber is cut on an arbitrary surface perpendicular to the traveling direction of the thread, the maximum value of the diameter of the circle on the cut surface is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the circle of the cut surface is 5 mm or less.

As a result, it is possible to realize a configuration in which the shape of the inflow chamber does not change suddenly. Therefore, the air flow in the inflow chamber can be smoothed.

In the air spinning apparatus, the volume of the inflow chamber is preferably 3000 mm ³ or more and 8000 mm ³ or less.

This makes it possible to form an inflow chamber space suitable for spinning.

It is preferable that the air spinning device further includes a hollow guide shaft body for leading the yarn to the outside.

This makes it possible to easily guide the yarn spun by the swirling air flow toward the outside of the air spinning apparatus.

In the air spinning device, the hollow guide shaft preferably has a slope that is inclined at an angle of 37 degrees or more and 70 degrees or less with respect to the traveling direction of the yarn at a portion inserted into the inflow chamber.

As a result, it is possible to ensure that the space through which the air flows in the inflow chamber has a certain size in the state where the hollow guide shaft is inserted.

The air spinning device preferably has the following configuration. That is, the nozzle block is formed with a swirling air flow generating chamber for generating the swirling air flow. The swirling air flow generating chamber is formed in a tapered shape whose diameter increases as the distance from the fiber guide increases. The outer peripheral surface of the portion of the hollow guide shaft inserted into the swirling air flow generating chamber is parallel to or substantially parallel to the inner wall surface of the swirling air flow generating chamber.

As a result, the swirling space of the fibers forming the yarn can be appropriately formed so that the swirling air flow flows smoothly.

The air spinning device preferably includes a pressure sensor that detects the pressure in the inflow chamber.

As a result, it is not possible to properly detect the pressure in the inflow chamber due to the influence of exhaust gas as in the past, or it takes time from the start of foreign matter accumulation in the inflow chamber until the pressure change occurs, so that abnormalities in the inflow chamber can be detected. There is no delay, and the pressure in the inflow chamber can be detected appropriately.

According to the second aspect of the present invention, an air spinning machine having the following configuration is provided. That is, the air spinning machine includes the air spinning device and a draft device. The draft device drafts a sliver into a fiber bundle. The nozzle distance, which is the distance from the portion of the draft device that sends out the fiber bundle at the most downstream to the upstream end face of the hollow guide shaft provided in the air spinning device, is larger than 1.5 times the diameter of the inflow chamber. Less than 0 times.

Thereby, the appropriately stretched fiber bundle can be introduced into the air spinning apparatus and spun.

It is preferable that the air spinning machine further includes a tension sensor that detects the tension of the yarn generated by the air spinning device.

As a result, even in a case where it is difficult for the pressure sensor to detect the spinning abnormality, the tension sensor can obtain information on the tension of the yarn, and the spinning abnormality can be appropriately detected.

According to the third aspect of the present invention, an air spinning method having the following configuration is provided. That is, in this air spinning method, spinning is performed using the air spinning device while changing the shape of the inflow chamber according to the type of fiber bundle to be spun.

Thereby, by setting the size of the inflow chamber through which the swirling air flow flows to a size suitable for the type of fiber bundle, the pressure in the swirling air flow generation chamber can be set to a pressure suitable for spinning. Therefore, foreign matter such as fiber waste contained in the fiber bundle can be easily discharged, and the quality of the spun yarn can be improved.

The front view which shows the overall structure of the air spinning machine provided with the air spinning apparatus which concerns on one Embodiment of this invention. A side view showing a spinning unit and a thread joint carriage. A partial cross-sectional view showing the configuration of an air spinning device. An exploded perspective view showing the structure of a spinning block. The perspective view which shows the structure of the spinning block and the hollow guide shaft body.

Next, the air spinning machine 1 provided with the air spinning device 4 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The air spinning machine 1 shown in FIG. 1 includes a blower box 11, a prime mover box 12, a plurality of spinning units 2, and a thread joint carriage 8. The plurality of spinning units 2 are arranged side by side in a predetermined direction.

A blower 13 or the like that functions as a negative pressure source is arranged in the blower box 11.

In the prime mover box 12, a drive source (not shown), a central control device 14, a display unit 15, and an operation unit 16 are arranged. The drive source provided in the prime mover box 12 includes a motor commonly used in the plurality of spinning units 2.

The central control device 14 centrally manages and controls each part of the air spinning machine 1. As shown in FIG. 2, the central control device 14 is connected to the unit control unit 20 included in each spinning unit 2 via a signal line (not shown). In the present embodiment, each spinning unit 2 includes a unit control unit 20, but a predetermined number (for example, two or four) spinning units 2 may share one unit control unit 20.

The display unit 15 can display information regarding the setting contents for the spinning unit 2 and / or the state of the spinning unit 2. When the display unit 15 is a touch panel display, the display unit 15 and the operation unit 16 may be integrally configured.

Each spinning unit 2 mainly includes a draft device 3, an air spinning device 4, a yarn storage device 5, and a take-up device 6, which are arranged in order from upstream to downstream. Here, "upstream" and "downstream" mean upstream and downstream in the traveling direction of the sliver S, the fiber bundle F, and the spun yarn Y at the time of winding the spun yarn (yarn) Y.

The draft device 3 is provided near the upper end of the frame 10 included in the air spinning machine 1. As shown in FIG. 2, the draft device 3 includes four draft roller pairs. The four draft roller pairs are a back roller pair 31, a third roller pair 32, a middle roller pair 33, and a front roller pair 34, which are arranged in order from upstream to downstream. An apron belt 35 is provided for each roller on the middle roller pair 33.

The draft device 3 sandwiches the sliver S supplied from the sliver case (not shown) between the rollers of each draft roller pair and conveys the sliver S, thereby stretching the sliver S to a predetermined fiber amount (or thickness) (or thickness). Draft) to produce a fiber bundle F. The fiber bundle F generated by the draft device 3 is supplied to the air spinning device 4.

The air spinning device 4 applies a swirling air flow to the fiber bundle F generated by the draft device 3 to twist and generate the spun yarn Y. The detailed configuration of the air spinning device 4 will be described later.

The spun yarn Y produced by the air spinning apparatus 4 is supplied to the yarn storage device 5. As shown in FIG. 2, the yarn storage device 5 includes a thread storage roller 51 and a motor 52.

The yarn storage roller 51 is rotationally driven by the motor 52. The yarn storage roller 51 winds the spun yarn Y around its outer peripheral surface and temporarily stores it. The yarn storage roller 51 rotates at a predetermined rotation speed with the spun yarn Y wound around the outer peripheral surface, so that the spun yarn Y is pulled out from the air spinning device 4 at a predetermined speed and conveyed to the downstream side.

As described above, the yarn storage device 5 can temporarily store the spun yarn Y on the outer peripheral surface of the yarn storage roller 51, and thus functions as a kind of buffer for the spun yarn Y. As a result, there is a problem that the spinning speed in the air spinning device 4 and the winding speed (running speed of the spinning yarn Y wound on the package 60 described later) do not match for some reason (for example, slackening of the spinning yarn Y). Etc.) can be eliminated.

A yarn monitoring device 50 and a tension sensor 53 are provided between the air spinning device 4 and the yarn storage device 5. The spun yarn Y generated by the air spinning device 4 passes through the yarn monitoring device 50 and the tension sensor 53 before being stored by the yarn storage device 5.

The yarn monitoring device 50 monitors the quality of the running spun yarn Y with an optical sensor and detects yarn defects contained in the spun yarn Y. As the yarn defect, for example, an abnormality in the thickness of the spun yarn Y, a foreign substance contained in the spun yarn Y, or the like can be considered. When the yarn monitoring device 50 detects a yarn defect of the spun yarn Y, the yarn monitoring device 50 transmits a yarn defect detection signal to the unit control unit 20. The yarn monitoring device 50 may monitor the quality of the spun yarn Y by using, for example, a capacitance type sensor instead of the optical sensor. Alternatively or in addition to these examples, the yarn monitoring device 50 may be configured to measure the tension of the spun yarn Y as the quality of the spun yarn Y.

The tension sensor 53 measures the tension of the spinning yarn Y traveling between the air spinning device 4 and the yarn storage device 5. The tension sensor 53 transmits the measured tension value to the unit control unit 20.

When the unit control unit 20 receives a yarn defect detection signal from the yarn monitoring device 50 or an abnormal tension value from the tension sensor 53, the unit control unit 20 stops the driving of the air spinning device 4 and / or the draft device 3 to drive the spun yarn Y. Disconnect. That is, the air spinning device 4 functions as a cutting portion for cutting the spun yarn Y when the yarn monitoring device 50 detects a yarn defect. The spinning unit 2 may be provided with a cutter for cutting the spinning yarn Y.

The take-up device 6 includes a cradle arm 61, a take-up drum 62, and a traverse guide 63. The cradle arm 61 is swingably supported around the support shaft 64, and can rotatably support the bobbin 65 (that is, the package 60) for winding the spun yarn Y. The take-up drum 62 rotates in contact with the bobbin 65 or the outer peripheral surface of the package 60 to rotationally drive the package 60 in the take-up direction. The take-up device 6 drives the take-up drum 62 by the electric motor shown in the figure while reciprocating the traverse guide 63 by the driving means shown in the figure. As a result, the take-up device 6 winds the spun yarn Y into the package 60 while twisting the spun yarn Y.

As shown in FIG. 1, in the frame 10 of the air spinning machine 1, rails 81 are arranged along the direction in which a plurality of spinning units 2 are arranged. The thread joint carriage 8 is configured to be able to travel on the rail 81. As a result, the thread joint carriage 8 can be moved with respect to the plurality of spinning units 2. The yarn splicing carriage 8 travels to the spinning unit 2 where the yarn breakage or the yarn breakage has occurred, and performs the yarn splicing work for the spinning unit 2.

As shown in FIG. 1, the thread splicing carriage 8 includes a traveling wheel 82, a thread splicing device 83, a suction pipe 84, and a suction mouse 85. The thread joint carriage 8 further includes a carriage control unit 80 shown in FIG.

The suction pipe 84 can capture the spun yarn Y generated by the air spinning apparatus 4 at the time of spinning. Specifically, the suction pipe 84 can suck and capture the spun yarn Y sent out from the air spinning device 4 by generating a suction air flow at the tip thereof. The suction mouse 85 can capture the spun yarn Y wound in the package 60 of the winding device 6. Specifically, the suction pipe 84 can suck and capture the spun yarn Y from the package 60 supported by the winding device 6 by generating a suction air flow at the tip thereof. The suction pipe 84 and the suction mouse 85 rotate while capturing the spun yarn Y to guide the spun yarn Y to a position where the spun yarn Y can be introduced into the yarn splicing device 83.

The yarn splicing device 83 splics the spun yarn Y from the air spinning device 4 guided by the suction pipe 84 and the spun yarn Y from the package 60 guided by the suction mouse 85. In the present embodiment, the yarn splicing device 83 is a splicer device that twists yarn ends with each other by a swirling air flow. The thread splicing device 83 is not limited to the splicer device, and for example, a mechanical knotter or the like can be adopted.

The carriage control unit 80 (see FIG. 2) is configured as a known computer having a CPU, ROM, RAM, etc. (not shown). The bogie control unit 80 controls the thread splicing work performed by the thread splicing bogie 8 by controlling the operation of each unit included in the thread splicing bogie 8.

Next, the configuration of the air spinning apparatus 4 will be described in detail with reference to FIG. 3 and the like.

As shown in FIG. 3, the air spinning device 4 mainly includes a spinning block 41 and a hollow guide shaft body 42.

In the spinning block 41, the fiber bundle F supplied from the draft device 3 is guided to the inside thereof, and a swirling air flow is applied to the fiber bundle F. The generation and stop of the swirling air flow are controlled by the unit control unit 20. As shown in FIGS. 3 and 4, the spinning block 41 mainly includes a fiber guide 41a, a nozzle block 41b, a nozzle head (inflow chamber forming block) 41c, and a nozzle cap 41d.

The fiber guide 41a is a member that guides the drafted fiber bundle F to the swirling air flow generation chamber 40 described later. As shown in FIG. 4, the fiber guide 41a is formed with a guide hole 41e that penetrates the fiber guide 41a in the fiber bundle traveling direction (vertical direction in FIG. 4). The fiber bundle F passes through the guide hole 41e and is introduced into the swirling air flow generation chamber 40.

The swirling air flow generation chamber 40 is formed inside the nozzle block 41b. As shown in FIG. 3, the swirling air flow generating chamber 40 is formed in a tapered shape whose diameter increases from upstream to downstream. In the swirling air flow generation chamber 40, compressed air (air) is injected from a nozzle (not shown) to generate a swirling air flow acting on the fiber bundle F. Under the action of this swirling air flow, the fiber ends of the plurality of fibers constituting the fiber bundle F are inverted and swirled.

The nozzle block 41b is provided with a plurality of nozzles (not shown) through which the air injected into the swirling air flow generation chamber 40 passes. This nozzle is configured as, for example, an elongated hole formed in the nozzle block 41b (the wall constituting the swirling air flow generation chamber 40). Each nozzle is provided so that the longitudinal direction is slightly inclined to the downstream side in the thread feeding direction. The plurality of nozzles are arranged at equal intervals around the swirling air flow generation chamber 40. The compressed air supplied from the compressed air source (not shown) is injected into the swirling air flow generation chamber 40 via each nozzle. The air injected from the nozzle swirls around the hollow guide shaft 42 described later inserted into the swirling air flow generation chamber 40, and flows toward the downstream side. In this way, a swirling air flow that is counterclockwise when viewed in the direction from upstream to downstream is generated in the swirling air flow generation chamber 40. This swirling air flow spirals toward the downstream (inflow chamber 7).

The nozzle head 41c and the nozzle cap 41d hold the fiber guide 41a and the nozzle block 41b. The nozzle head 41c and the nozzle cap 41d function as a casing for accommodating a part of the fiber guide 41a and the nozzle block 41b.

The nozzle head 41c is formed in a block shape having a certain thickness. As shown in FIG. 4, the nozzle head 41c has a shape in which a semicircle having the length of the side connected to one side of the rectangle when viewed in the thickness direction. In the following description, the direction in which the rectangle and the semicircle are lined up may be referred to as the longitudinal direction of the nozzle head 41c. The nozzle head 41c is formed with an inflow chamber 7 and an air discharge passage (exhaust passage) 70.

The inflow chamber 7 is formed in a substantially columnar shape on one side in the longitudinal direction of the nozzle head 41c. The central axis of the inflow chamber 7 is arranged so as to coincide with the center of the semicircle of the nozzle head 41c. The inflow chamber 7 is connected to the swirling air flow generation chamber 40. Most of the inflow chamber 7 is located on the side farther from the swirling air flow generation chamber 40 when viewed from the fiber guide 41a.

Although the details will be described later, the hollow guide shaft body 42 described later is inserted into the center of the inflow chamber 7. A ring-shaped gap is formed between the inner wall of the inflow chamber 7 and the hollow guide shaft body 42. A ring-shaped portion of the internal space of the inflow chamber 7 in which the hollow guide shaft body 42 is not arranged functions substantially as an air passage path.

When the inflow chamber 7 is cut perpendicular to the traveling direction of the spun yarn Y, its cross section becomes circular. In the present embodiment, the diameter of the outer circumference of the inflow chamber 7 is formed so as to gradually increase as the distance from the fiber guide 41a increases. Therefore, the diameter of the circle in the cross section (corresponding to the diameter of the outer circumference of the inflow chamber 7) gradually increases as the position where the inflow chamber 7 is cut becomes the downstream side.

In FIG. 5, the maximum diameter D1 which is the diameter in the portion where the outer circumference of the inflow chamber 7 is the largest (in other words, the portion farthest from the swirling air flow generation chamber 40) and the minimum diameter D2 in the smallest portion of the inflow chamber 7 are shown. Is indicated by a white arrow. In the present embodiment, both the maximum diameter D1 and the minimum diameter D2 are 28 mm or more and less than 34 mm. However, the present invention is not limited to this range. The maximum diameter D1 can be set within the range of 25 mm or more and 36 mm or less depending on the type of the fiber bundle F to be spun.

As described above, in the present embodiment, the diameter of the inflow chamber 7 is not uniform. Hereinafter, the average diameter of the inflow chamber 7 may be simply referred to as the diameter D of the inflow chamber 7. This diameter D is shown in FIG. The diameter D of the inflow chamber 7 can be, for example, the sum of the maximum diameter D1 and the minimum diameter D2 described above. The diameter D of the inflow chamber 7 is larger than the minimum diameter D2 and smaller than the maximum diameter D1.

Although the details will be described later, there is a portion connected to the air discharge passage 70 via the connection opening 71 on the outer periphery of the inflow chamber 7. When the inflow chamber 7 is cut so as to include this portion, the cross section does not become circular. However, since this cross section has an arcuate portion, the diameter of the arcuate may be considered. Alternatively, when the inflow chamber 7 is cut in the same manner as above at a location where the connection opening 71 is not formed, the inflow chamber 7 has a portion where the diameter of the circle in the cross section is within the range of 25 mm or more and 36 mm or less. You just have to do it.

The axial direction of the inflow chamber 7 is the direction connecting the front side and the back side when the fiber bundle F or the spun yarn Y is viewed in the direction of passing through the air spinning device 4. In consideration of this, in the following, the length of the inflow chamber 7 in the axial direction is referred to as the depth. Depth is indicated by reference numeral L1 in FIGS. 3 and 5. In the present embodiment, the depth L1 is 38% or more and 75% or less of the diameter D of the inflow chamber 7.

The size of the depth L1 of the inflow chamber 7 is set according to the diameter D of the inflow chamber 7 and the inclination angle of the tapered surface 43 of the shaft body holder 42b described later. In the present embodiment, the depth L1 of the inflow chamber 7 is 14 mm or more and 25 mm or less. This makes it possible to secure a sufficient volume of the inflow chamber 7.

In the inflow chamber 7 of the present embodiment, the difference between the diameter of the portion having the largest outer circumference (the above-mentioned maximum diameter D1) and the minimum diameter D2 which is the diameter of the portion having the smallest outer circumference is within 5 mm. In the present embodiment, the difference between the maximum diameter D1 and the minimum diameter D2 is 3 mm. The inflow chamber 7 formed as described above has a volume of 3000 mm ³ or more and 8000 mm ³ or less.

The inflow chamber 7 is formed so that the side facing the hollow guide shaft body 42, which will be described later, is open. In other words, in the inflow chamber 7, the side opposite to the side into which the nozzle block 41b is inserted is open. From this open side, the hollow guide shaft 42 can be inserted into the inflow chamber 7.

The inflow chamber 7 is formed with a connection opening 71 that opens toward the air discharge passage 70. The inflow chamber 7 is connected to the air discharge passage 70 via the connection opening 71. The air in the inflow chamber 7 is discharged to the outside through the air discharge passage 70.

The air discharge passage 70 is formed in a straight line. The longitudinal direction of the air discharge passage 70 is parallel to the longitudinal direction of the nozzle head 41c and is perpendicular to the traveling direction of the spun yarn Y. The air discharge passage 70 has a rectangular cross section cut perpendicular to the longitudinal direction thereof. The air discharge passage 70 is formed so as to open in the longitudinal direction of the nozzle head 41c on the side opposite to the side on which the inflow chamber 7 is formed. That is, the air discharge passage 70 connects the inflow chamber 7 and the outside of the air spinning device 4. Specifically, the outside of the air spinning device 4 is a negative pressure source including a blower 13 or the like that sucks with a weak force. The air discharge passage 70 is connected to the blower 13 via, for example, a duct (not shown) arranged along the parallel direction of the spinning unit 2.

The inflow chamber 7 is located on the downstream side of the swirling air flow generating chamber 40 in the flow of the swirling air flow. Further, the inflow chamber 7 has a space relatively larger than the swirling air flow generation chamber 40. Therefore, the pressure in the inflow chamber 7 is lower than the pressure in the swirling air flow generation chamber 40. How much the pressure in the inflow chamber 7 is lower than the pressure in the swirling air flow generation chamber 40 is greatly affected by the size of the inflow chamber 7.

In this respect, in the present embodiment, the pressure in the inflow chamber 7 can be made appropriate by forming the inflow chamber 7 in a size corresponding to the type of the fiber bundle F. For example, it is conceivable to prepare in advance a plurality of spinning blocks 41 having different maximum diameters D1, minimum diameters D2, depth L1, etc., and to replace the spinning blocks 41 according to the fiber bundle F to be used. Be done. As a result, the air flow in the swirling air flow generation chamber 40 can flow into the inflow chamber 7 at an appropriate speed, and the fiber debris that has fallen off from the fiber bundle F rides on the air flow and easily enters the inflow chamber 7. be introduced.

The fiber debris in the inflow chamber 7 is easily discharged from the air spinning device 4 through the air discharge passage 70 without staying in the inflow chamber 7 due to the suction force of the negative pressure source. As a result, in the swirling air flow generation chamber 40, fiber debris does not remain in the fiber bundle F for generating the spun yarn Y and is smoothly discharged, so that the spun yarn Y with high quality can be produced. .. Since the fiber debris and the like are less likely to stay in the inflow chamber 7 in this way, foreign matter such as the fiber debris is less likely to come into contact with the rotating fibers while being inverted in the fiber bundle F. Therefore, the tension of the fiber bundle F can be stabilized.

As shown in FIG. 5, the connection opening 71 is configured to have a substantially rectangular shape (a rectangular shape with rounded corners). In this connection opening 71, the distance L2 between the end portion located on one side in the circumferential direction of the inflow chamber 7 and the end portion located on the other side in the circumferential direction is smaller than the maximum diameter D1. As a result, the air flow can be smoothly discharged from the inflow chamber 7 with a compact configuration.

An insertion hole 41f for inserting a part of the nozzle block 41b is formed on the side of the nozzle head 41c facing the nozzle cap 41d. A part of the nozzle block 41b is inserted into the inflow chamber 7 through the insertion hole 41f.

When assembling the spinning block 41, as shown in FIG. 4 and the like, a part of the nozzle block 41b is inserted into the inflow chamber 7 through the insertion hole 41f. As a result, the swirling air flow generation chamber 40 formed in the nozzle block 41b and the inflow chamber 7 formed in the nozzle head 41c are connected. Therefore, the swirling air flow formed in the swirling air flow generation chamber 40 can flow to the inflow chamber 7.

As shown in FIG. 3, the spinning unit 2 of the present embodiment is provided with a pressure sensor 9 for detecting the pressure in the inflow chamber 7. The pressure sensor 9 detects the pressure in the inflow chamber 7 via, for example, a tube (not shown) inserted in a pressure detection hole penetrating the wall of the inflow chamber 7. The pressure sensor 9 is electrically connected to the unit control unit 20. The pressure sensor 9 transmits a signal indicating the detected pressure to the unit control unit 20. The unit control unit 20 determines whether or not an abnormality such as clogging of the inflow chamber 7 has occurred based on the pressure acquired from the pressure sensor 9.

In the air spinning apparatus 4 of the present embodiment, as described above, the maximum diameter D1 of the inflow chamber 7 is 25 mm or more, preferably 28 mm or more, and the inflow chamber 7 is formed to be large to some extent. Therefore, the pressure detection hole for detecting the pressure in the inflow chamber 7 can be provided at a position away from the connection opening 71. As a result, the pressure detection is less affected by the exhaust gas, so that the change in the pressure in the inflow chamber 7 can be detected with high accuracy.

However, in the present embodiment, the above-mentioned maximum diameter D1 is 36 mm or less, preferably less than 34 mm, and the inflow chamber 7 is not too large. Therefore, when foreign matter such as fiber waste is deposited in the inflow chamber 7, the pressure in the inflow chamber 7 is likely to change. Therefore, before a large amount of foreign matter such as fiber dust is accumulated in the inflow chamber 7, the foreign matter such as fiber dust can be discharged by an appropriate operation based on pressure detection (for example, an automatic cleaning operation). As a result, it is possible to prevent foreign matter such as fiber waste from adhering to the spun yarn Y.

The nozzle cap 41d is arranged on the nozzle head 41c. The nozzle cap 41d is detachably attached to the nozzle head 41c via, for example, a bolt or the like. As shown in FIG. 4, the nozzle cap 41d is formed in a plate shape having a circular cross-sectional shape cut perpendicular to the traveling direction of the fiber bundle F. A through hole through which a part of the fiber guide 41a can pass is formed in the center of the nozzle cap 41d.

When the spinning block 41 is configured, as shown in FIG. 3 or 5, the fiber guide 41a is a nozzle cap 41d from the lower side of the nozzle cap 41d (downstream side in the yarn traveling direction at the time of spinning) through the through hole. The head is exposed upward (upstream side in the thread traveling direction, draft device 3 side) from the fiber guide 41a.

By mounting the nozzle cap 41d on the nozzle head 41c, the fiber guide 41a and the nozzle block 41b are sandwiched between the nozzle head 41c and the nozzle cap 41d, and their positions are fixed. In this way, the spinning block 41 is configured.

The hollow guide shaft body 42 is provided on the downstream side of the spinning block 41. The hollow guide shaft body 42 is provided so as to be switchable between a contact position in contact with the spinning block 41 and a separation position away from the spinning block 41. The switching of the position of the hollow guide shaft body 42 is realized by the moving mechanism (not shown). When the hollow guide shaft body 42 is in the contact position, the open side of the inflow chamber 7 is closed by the hollow guide shaft body 42, and a closed inflow chamber 7 is formed. When the hollow guide shaft body 42 is in the separated position, the inflow chamber 7 is opened to the outside. When the inflow chamber 7 is closed, the fiber debris inside the inflow chamber 7 can be removed by the suction device (not shown). In the state where the inflow chamber 7 is open, for example, by injecting air from the nozzle of the nozzle block 41b, it is possible to remove the fiber debris remaining at the tip of the swirling air flow generation chamber 40 and the hollow guide shaft body 42. can.

The hollow guide shaft body 42 is fixed to the hollow guide shaft body holding portion (not shown). The guide shaft body block is configured from the hollow guide shaft body holding portion and the hollow guide shaft body 42. The hollow guide shaft body 42 includes a shaft body 42a and a shaft body holder 42b.

A cylindrical thread passage is formed inside the shaft body 42a. The yarn passage leads the spun yarn Y spun in the swirling air flow generation chamber 40 to the outside. A swirling air flow flowing from upstream to downstream may be generated in the thread passage by injecting air from a nozzle (not shown). When viewed from the upstream to the downstream, the direction of the swirling air flow generated in the thread passage is opposite to the direction of the swirling air flow in the swirling air flow generation chamber 40. In FIG. 3, the tip of the shaft body 42a (the inlet of the thread passage) constituting a part of the swirling air flow generation chamber 40 and the entire thread passage are integrally configured. The nozzle (not shown) may be formed in a tubular member different from the shaft body 42a, and the tubular member may be arranged inside the shaft body 42a. The thread passage may be formed by a plurality of members.

The upstream portion of the shaft body 42a is formed in a conical shape. The conical upstream portion of the shaft body 42a is formed to be slightly smaller than the tapered space of the swirling air flow generation chamber 40. The upstream portion is inserted inside the swirling air flow generation chamber 40.

As shown in FIG. 3, the outer peripheral surface of the upstream portion of the shaft body 42a inserted into the swirling air flow generating chamber 40 is formed substantially parallel to the wall surface of the inner wall constituting the swirling air flow generating chamber 40 in the nozzle block 41b. Has been done. That is, the distance between the outer wall surface of the upstream portion of the shaft body 42a inserted into the swirling air flow generating chamber 40 and the inner wall surface of the swirling air flow generating chamber 40 facing the outer wall surface is substantially constant. As a result, it is possible to avoid a sudden change in the ease of air flow in the flow path of the swirling air flow. Therefore, in the swirling air flow generation chamber 40, it is possible to prevent a sudden change in the speed of the air flow and stably perform spinning. However, the shape of the upstream portion of the shaft body 42a and / or the shape of the inner wall surface of the swirling air flow generation chamber 40 may be another shape. The above distance does not have to be constant, and for example, the distance on the upstream side may be larger or smaller than the distance on the downstream side.

In a state where the spinning block 41 and the hollow guide shaft body 42 are in contact with each other, the upstream portion of the shaft body 42a passes through the inflow chamber 7 and protrudes into the swirling air flow generation chamber 40. As a result, a tapered cylindrical space is formed between the shaft body 42a and the swirling air flow generation chamber 40. In this space, the fibers contained in the fiber bundle F swirl due to the action of the swirling air flow.

The shaft body holder 42b is used to hold the shaft body 42a. The shaft body holder 42b is formed in a tapered shape in which the outer diameter gradually increases from upstream to downstream. The shaft body holder 42b is formed with a holding hole that penetrates the shaft body holder 42b in parallel with the traveling direction of the spun yarn Y. The shaft body holder 42b holds the shaft body 42a by inserting the downstream portion of the shaft body 42a into the holding hole.

The upper portion of the shaft body holder 42b is formed in a conical shape whose diameter increases as the distance from the nozzle block 41b increases. In the following description, the tapered outer peripheral surface formed on the upper portion of the shaft body holder 42b may be referred to as a tapered surface (slope) 43. The inclination angle (inner angle) θ formed by the tapered surface 43 with respect to the axis of the hollow guide shaft body 42 is 37 degrees or more and 70 degrees or less. Thereby, a sufficient space for air flow and discharge can be formed between the hollow guide shaft body 42 and the wall of the inflow chamber 7. Therefore, the fiber waste can be smoothly discharged by being placed on the air flow.

As shown in FIG. 3, the air spinning device 4 of the present embodiment is provided on the downstream side of the draft device 3. Specifically, the position where the fiber bundle F is discharged from the front roller pair 34 of the draft device 3 (nip point by the front roller pair 34) and the upstream end surface (tip) of the hollow guide shaft body 42 of the air spinning device 4. The air spinning device 4 is provided on the downstream side of the draft device 3 so that the nozzle distance L3, which is the distance between the two, is larger than 1.5 times and smaller than 2.0 times the diameter D of the inflow chamber 7. Has been done. As a result, the fiber bundle F is appropriately stretched and introduced into the air spinning apparatus 4 in a stable state, so that a spun yarn Y of good quality can be produced.

As described above, the air spinning apparatus 4 of the present embodiment twists the fiber bundle F by the swirling air flow to generate the spun yarn Y. The air spinning device 4 includes a fiber guide 41a, a nozzle block 41b, and a nozzle head 41c. The fiber guide 41a guides the fiber bundle F. The nozzle block 41b is formed with a nozzle through which compressed air for generating a swirling air flow acting on the fiber bundle F guided by the fiber guide 41a passes. The nozzle head 41c is formed with an inflow chamber 7 into which a swirling air flow flows. The inflow chamber 7 has a portion in which the diameter of the circle on the cut surface is 25 mm or more and 36 mm or less when the inflow chamber 7 is cut perpendicular to the traveling direction of the spun yarn Y.

This makes it possible to configure the inflow chamber 7 in which fiber waste can be easily collected. As a result, each fiber contained in the fiber bundle F can be smoothly swirled by the action of the swirling air flow, and high quality spun yarn Y can be produced.

In the air spinning apparatus 4 of the present embodiment, the inflow chamber 7 has a portion in which the diameter of the circle of the cut surface is 28 mm or more and less than 34 mm when the inflow chamber 7 is cut perpendicular to the traveling direction of the spun yarn Y. ing.

This makes it easier to collect fiber debris.

In the air spinning apparatus 4 of the present embodiment, the length of the inflow chamber 7 in the traveling direction of the spun yarn Y (the depth L1) is 38% or more and 75% or less of the diameter D of the inflow chamber 7.

As a result, the inflow chamber 7 suitable for the shape of the hollow guide shaft body 42 can be formed.

In the air spinning apparatus 4 of the present embodiment, the length of the inflow chamber 7 (the depth L1) in the traveling direction of the spun yarn Y is 14 mm or more and 25 mm or less.

Thereby, an inflow chamber 7 having an appropriate size can be formed.

In the air spinning apparatus 4 of the present embodiment, the nozzle head 41c is formed with a connection opening 71. The inflow chamber 7 is connected to the air discharge passage 70 for discharging the swirling air flow through the connection opening 71.

As a result, the air in the inflow chamber 7 can be discharged. In addition, the fiber waste collected in the inflow chamber 7 can be easily discharged.

In the air spinning apparatus 4 of the present embodiment, the distance L2 between the end portion of the inflow chamber 7 located on one side in the circumferential direction and the end portion located on the other side in the circumferential direction in the connection opening 71 is the inflow chamber. It is smaller than the diameter D of 7.

As a result, the air in the inflow chamber 7 can be discharged to the outside in a compact configuration.

In the air spinning apparatus 4 of the present embodiment, the inflow chamber 7 is the diameter of the circle of the cut surface when the inflow chamber 7 is cut at a position where the connection opening 71 is not formed and is perpendicular to the traveling direction of the spinning yarn Y. Has a portion of 25 mm or more and 36 mm or less.

Thereby, the size of the inflow chamber 7 can be kept within an appropriate range.

In the air spinning apparatus 4 of the present embodiment, the diameter of the circle of the cut surface of the inflow chamber 7 increases as the distance from the fiber guide 41a increases.

As a result, the compressed air injected from the nozzle of the nozzle block 41b can be smoothly discharged.

In the air spinning apparatus 4 of the present embodiment, when the inflow chamber 7 is cut on an arbitrary surface perpendicular to the traveling direction of the spun yarn Y, the maximum diameter D1 of the circle of the cut surface is 25 mm or more and 36 mm or less. The difference between the maximum diameter D1 and the minimum diameter D2 of the circle of the cut surface is 5 mm or less.

As a result, it is possible to realize a configuration in which the shape of the inflow chamber 7 does not change suddenly. Therefore, the air flow in the inflow chamber 7 can be smoothed.

In the air spinning apparatus 4 of the present embodiment, the volume of the inflow chamber 7 is 3000 mm ³ or more and 8000 mm ³ or less.

Thereby, the space of the inflow chamber 7 suitable for spinning can be formed.

The air spinning device 4 of the present embodiment further includes a hollow guide shaft body for leading the spun yarn Y to the outside.

As a result, the spun yarn Y spun by the swirling air flow can be easily guided toward the outside of the air spinning apparatus 4.

In the air spinning apparatus 4 of the present embodiment, the hollow guide shaft body 42 is a tapered surface that is inclined at an angle of 37 degrees or more and 70 degrees or less with respect to the traveling direction of the spun yarn Y at the portion inserted into the inflow chamber 7. Has 43.

As a result, it is possible to ensure that the space through which the air flows in the inflow chamber 7 has a certain size in the state where the hollow guide shaft body 42 is inserted.

The nozzle block 41b of the air spinning device 4 of the present embodiment is formed with a swirling air flow generating chamber 40 for generating a swirling air flow. The swirling air flow generating chamber 40 is formed in a tapered shape whose diameter increases as the distance from the fiber guide 41a increases. The outer peripheral surface of the portion of the hollow guide shaft 42 inserted into the swirling air flow generating chamber 40 is parallel to or substantially parallel to the inner wall surface of the swirling air flow generating chamber 40.

As a result, the swirling space of the fibers forming the spun yarn Y can be appropriately formed so that the swirling air flow flows smoothly.

The air spinning device 4 of the present embodiment includes a pressure sensor 9 that detects the pressure in the inflow chamber 7.

As a result, the pressure in the inflow chamber 7 cannot be properly detected due to the influence of exhaust gas as in the conventional case, or it takes time from the start of foreign matter accumulation in the inflow chamber 7 until the pressure change occurs. The detection of the abnormality inside is not delayed, and the pressure in the inflow chamber 7 can be appropriately detected by the pressure sensor 9.

As described above, the air spinning machine 1 of the present embodiment includes an air spinning device 4 and a draft device 3. The draft device 3 drafts the sliver into a fiber bundle F. In the draft device 3, the nozzle distance L3, which is the distance from the portion where the fiber bundle F is sent out at the most downstream (the portion held by the front roller pair 34) to the upstream end surface of the hollow guide shaft body 42, is 1 of the diameter D of the inflow chamber 7. Greater than 5.5 times and less than 2.0 times.

As a result, the appropriately stretched fiber bundle F can be introduced into the air spinning apparatus 4 for spinning.

The air spinning machine 1 of the present embodiment further includes a tension sensor 53 that detects the tension of the spinning yarn Y generated by the air spinning device 4.

As a result, even in a case where it is difficult for the pressure sensor 9 to detect the spinning abnormality, the spinning abnormality can be appropriately detected by acquiring the information regarding the tension of the spinning yarn Y by the tension sensor 53.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

A delivery roller pair may be provided between the air spinning device 4 and the yarn storage device 5, and the spinning yarn Y may be drawn out from the air spinning device 4 by the delivery roller pair. In this case, at least one of a yarn storage device 5, a slack tube using a suction air flow, and a mechanical compensator may be provided downstream of the delivery roller pair.

In the yarn joint carriage 8, instead of the splicer device, the spun yarn Y may be in a continuous state by a notter device, piecing, or the like. Further, the yarn splicing carriage 8 may be omitted, and each spinning unit 2 may be provided with a device necessary for yarn splicing.

In the spinning unit 2, each device may be arranged so that the spun yarn Y supplied from the lower side is wound on the upper side in the height direction.

Although FIG. 3 and the like show a configuration in which the fiber guide 41a is provided with a needle-shaped member, the air spinning device 4 does not have to be provided with the needle-shaped member. The fiber guide 41a and the nozzle block 41b may be composed of one member instead of a separate member.

In the above embodiment, the spinning unit 2 includes both the pressure sensor 9 and the tension sensor 53, but the spinning unit 2 may be configured to include only one of the pressure sensor 9 and the tension sensor 53. good.

In the above embodiment, the specific device of the spinning unit 2 is driven simultaneously by the plurality of spinning units 2 by the drive source provided in the motor box 12. Each spinning unit 2 may be configured such that some or all of these specific devices are driven independently by each spinning unit 2.

4 Air spinning device 7 Inflow chamber 41a Fiber guide 41b Nozzle block 41c Nozzle head F Fiber bundle Y Spinning yarn (yarn)

Claims (17)

An air spinning device that twists a fiber bundle to generate a yarn by a swirling air flow.
A fiber guide that guides the fiber bundle and
A nozzle block in which a nozzle through which compressed air for generating a swirling air flow acting on the fiber bundle guided by the fiber guide passes is formed, and
An inflow chamber forming block in which an inflow chamber into which the swirling air flow flows is formed,
Equipped with
The air spinning apparatus is characterized in that the inflow chamber has a portion in which the diameter of the circle of the cut surface is 25 mm or more and 36 mm or less when the inflow chamber is cut perpendicular to the traveling direction of the yarn. The air spinning apparatus according to claim 1.
The air spinning apparatus is characterized in that the inflow chamber has a portion in which the diameter of the circle of the cut surface is 28 mm or more and less than 34 mm when the inflow chamber is cut perpendicular to the traveling direction of the yarn. The air spinning apparatus according to claim 1 or 2.
An air spinning apparatus characterized in that the length of the inflow chamber in the traveling direction of the yarn is 38% or more and 75% or less of the diameter of the inflow chamber. The air spinning apparatus according to claim 3.
An air spinning device characterized in that the length of the inflow chamber in the traveling direction of the yarn is 14 mm or more and 25 mm or less. The air spinning apparatus according to any one of claims 1 to 4.
The air spinning apparatus, wherein the inflow chamber is connected to an exhaust passage for discharging the swirling air flow through a connection opening formed in the inflow chamber forming block. The air spinning apparatus according to claim 5.
The air in the connection opening is characterized in that the distance between the end located on one side in the circumferential direction of the inflow chamber and the end located on the other side in the circumferential direction is smaller than the diameter of the inflow chamber. Spinning equipment. The air spinning apparatus according to claim 5 or 6.
The inflow chamber has a portion in which the diameter of the circle of the cut surface is 25 mm or more and 36 mm or less when the inflow chamber is cut perpendicular to the traveling direction of the thread at a position where the connection opening is not formed. An air spinning device characterized by that. The air spinning apparatus according to any one of claims 1 to 7.
An air spinning apparatus characterized in that the diameter of the circle of the cut surface of the inflow chamber increases as the distance from the fiber guide increases. The air spinning apparatus according to claim 8.
When the inflow chamber is cut on an arbitrary surface perpendicular to the traveling direction of the thread, the maximum value of the diameter of the circle on the cut surface is 25 mm or more and 36 mm or less.
An air spinning apparatus characterized in that the difference between the maximum value and the minimum value of the diameter of the circle of the cut surface is 5 mm or less. The air spinning apparatus according to any one of claims 1 to 9.
An air spinning apparatus characterized in that the volume of the inflow chamber is 3000 mm ³ or more and 8000 mm ³ or less. The air spinning apparatus according to any one of claims 1 to 10.
An air spinning device characterized by further including a hollow guide shaft body for leading a yarn to the outside. The air spinning apparatus according to claim 11.
The air spinning device is characterized in that the hollow guide shaft has a slope that is inclined at an angle of 37 degrees or more and 70 degrees or less with respect to the traveling direction of the yarn in a portion inserted into the inflow chamber. The air spinning apparatus according to claim 11 or 12.
The nozzle block is formed with a swirling air flow generating chamber for generating the swirling air flow.
The swirling air flow generating chamber is formed in a tapered shape whose diameter increases as the distance from the fiber guide increases.
An air spinning apparatus characterized in that the outer peripheral surface of a portion of the hollow guide shaft inserted into the swirling air flow generating chamber is parallel to or substantially parallel to the inner wall surface of the swirling air flow generating chamber. The air spinning apparatus according to any one of claims 1 to 13.
An air spinning device comprising a pressure sensor for detecting the pressure in the inflow chamber. The air spinning apparatus according to any one of claims 1 to 14,
A draft device that drafts a sliver into a fiber bundle,
Equipped with
The nozzle distance, which is the distance from the portion of the draft device that sends out the fiber bundle at the most downstream to the upstream end face of the hollow guide shaft body of the air spinning device, is larger than 1.5 times the diameter of the inflow chamber. An air spinning machine characterized by being smaller than 0 times. The air spinning machine according to claim 15.
An air spinning machine further comprising a tension sensor for detecting the tension of the yarn generated by the air spinning device. An air spinning method for spinning using the air spinning apparatus according to any one of claims 1 to 14.
An air spinning method characterized in that spinning is performed using the air spinning device while changing the shape of the inflow chamber according to the type of fiber bundle to be spun.

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