JP2021116495A - Nozzle block, air spinning device, and air spinning machine - Google Patents

Abstract

To provide a nozzle block that facilitates production of a nozzle and easily realizes high-speed spinning by the nozzle.SOLUTION: A nozzle block comprises a main body 111 having a swivel chamber 117 and a spinning nozzle 123. The spinning nozzle 123 comprises a straight portion 151 and a diameter changing portion 153. The straight portion 151 has an ejection port 125 located at one end in an axial direction of the nozzle and facing the swirl chamber 117, and extends in the axial direction of the spinning nozzle 123. The diameter changing portion 153 is connected to the straight portion 151 on a side opposite to the ejection port 125 in the axial direction of the spinning nozzle 123. A diameter of the diameter changing portion 153 increases from a connecting portion 155 between the straight portion 151 and the diameter changing portion 153 toward the other end side in the axial direction of the spinning nozzle 123. A length L2 of the straight portion 151 in the axial direction of the spinning nozzle 123 is 0.4 mm or more and 4 mm or less. An opening angle θ of the diameter changing portion 153 is 5 degrees or more and 90 degrees or less.SELECTED DRAWING: Figure 5

Description

The present invention relates to a nozzle block, an air spinning device and an air spinning machine.

Conventionally, in an air spinning machine, a nozzle block used in an air spinning device that produces a yarn by applying a swirling air flow to a fiber bundle has been known. Patent Documents 1 and 2 disclose this type of nozzle block.

In the configuration of Patent Document 1, the spinning device is composed of a nozzle block, a guide member support, and a rotary spindle. In this spinning device, the portion of the nozzle block that covers the vicinity of the entrance of the hollow guide shaft is a hollow chamber. A nozzle is formed in the nozzle block. After the compressed air flows into the air reservoir, the compressed air is ejected from the nozzle into the hollow chamber, and a high-speed swirling airflow is generated near the inlet of the hollow guide shaft. The nozzle is formed in a rubber tubular shape with an extended inlet and outlet.

In the configuration of Patent Document 2, the spinning apparatus is configured by a nozzle block or the like on which a nozzle is formed, similarly to the nozzle block of Patent Document 1. In this nozzle block, the nozzle has a first straight portion located on the air reservoir side in the axial direction and a second straight portion located on the hollow chamber side in the axial direction. The diameter of the first straight portion is set to be larger than the diameter of the second straight portion. The first straight portion and the second straight portion are connected so as to form a step between them.

Jikkenhei 6-10372 Gazette Jikkenhei 7-2472 Gazette

In the configuration of Patent Document 1, since the nozzle is formed in a rubber tubular shape, it is difficult to create the nozzle. In the configuration of Patent Document 2, there is a step in the middle of the nozzle in the axial direction, and the pressure loss becomes large with respect to the air passing through the nozzle. Therefore, in order to realize high-speed spinning, it is necessary to separately adopt a means such as increasing the air pressure supplied to the nozzle.

An object of the present invention is to facilitate the production of a nozzle and to easily realize high-speed spinning by the nozzle.

Means and effects to solve problems

According to the first aspect of the present invention, a nozzle block having the following configuration is provided. That is, this nozzle block is used in an air spinning device that produces yarn by applying a swirling air flow to a fiber bundle. The nozzle block includes a main body portion and a fiber guide portion. The main body has a swivel chamber. The fiber guide portion is provided with respect to the main body portion. A nozzle through which the air ejected into the swivel chamber passes is formed in the main body. The fiber guide unit guides the fiber bundle toward the swivel chamber. The nozzle includes a straight portion and a diameter changing portion. The straight portion has a spout located at one end in the axial direction of the nozzle and faces the swivel chamber, and is provided so as to extend in the axial direction of the nozzle. The diameter changing portion is connected to the straight portion on the side opposite to the ejection port in the axial direction of the nozzle. The diameter of the diameter changing portion increases from the connecting portion between the straight portion and the diameter changing portion toward the other end side in the axial direction of the nozzle. The length of the straight portion in the axial direction of the nozzle is 0.4 mm or more and 4 mm or less. The opening angle of the diameter changing portion is 5 degrees or more and 90 degrees or less.

This makes it possible to reduce the pressure loss with respect to the air passing through the nozzle. Therefore, high-speed spinning can be realized without increasing the air pressure supplied to the nozzle. Further, since the nozzle has a straight portion, the nozzle can be easily created.

In the nozzle block, the length of the straight portion in the axial direction of the nozzle is preferably 0.4 mm or more and 1 mm or less.

As a result, air can be ejected from the ejection port into the swirl chamber while the flow velocity of the air is sufficiently increased.

In the nozzle block, the opening angle of the diameter changing portion is preferably 10 degrees or more and 20 degrees or less.

As a result, the flow velocity of the air introduced into the straight portion can be increased.

The nozzle block preferably has the following configuration. That is, the diameter changing portion has an introduction port. The introduction port is located at the other end in the axial direction of the nozzle, and air supplied to the nozzle is introduced. The diameter change portion is formed in a tapered shape having the largest diameter at the introduction port.

As a result, the nozzle can be made smaller in the main body than a conventional nozzle composed of two straight portions having different diameters, and it is possible to avoid a decrease in strength of the main body due to the installation of the nozzle. can.

The nozzle block preferably has the following configuration. That is, the nozzle further includes another straight portion. The other straight portion has a diameter larger than the diameter of the straight portion, and is connected to the diameter changing portion on the opposite side of the straight portion. The diameter changing portion is formed in a tapered shape or an arc shape.

As a result, air flows well even in the diameter changing portion.

In the nozzle block, the length of the nozzle in the axial direction of the nozzle is preferably 1 mm or more and 8 mm or less.

This allows air to flow satisfactorily towards the spout at the nozzle.

The nozzle block preferably has the following configuration. That is, the number of the nozzles is 3 or more and 6 or less. The diameter of the spout is 0.4 mm or more and 0.8 mm or less.

As a result, the air ejected from the ejection port of one nozzle hits the air ejected from the ejection port of another nozzle, and a swirling air flow can be generated on the upstream side in the fiber traveling direction from the ejection port. Therefore, a swirling air flow along the inner wall surface of the swirl chamber can be generated in a wide range. Further, by not increasing the number of nozzles too much, the turbulence of the swirling air flow can be reduced.

In the nozzle block, the main body is preferably made of a ceramic or coated metal molded product.

Thereby, sufficient strength can be secured for the main body portion having the nozzle.

According to the second aspect of the present invention, an air spinning apparatus having the following configuration is provided. That is, this air spinning device includes the nozzle block and the hollow guide shaft body. A fiber bundle guided from the nozzle block passes through the hollow guide shaft body.

As a result, in the air spinning apparatus, the pressure loss with respect to the air passing through the nozzle can be reduced. Therefore, high-speed spinning can be realized without increasing the air pressure supplied to the nozzle. Further, in the nozzle, the presence of the straight portion facilitates the production of the nozzle and shortens the length of the tapered portion. Therefore, a nozzle having the required accuracy can be easily produced.

According to the third aspect of the present invention, an air spinning machine having the following configuration is provided. That is, this air spinning machine includes the above-mentioned air spinning device, a yarn drawing device, and a winding device. The yarn drawing device draws the yarn from the air spinning device. The take-up device winds the thread from the thread pull-out device to form a package.

As a result, in the air spinning apparatus of the air spinning machine, the pressure loss with respect to the air passing through the nozzle can be reduced. Therefore, high-speed spinning can be realized without increasing the air pressure supplied to the nozzle. As a result, the speed of forming the package by the air spinning machine can be improved.

The front view which shows the overall structure of the air spinning machine which comprises the spinning unit which has the air spinning apparatus which includes the nozzle block which concerns on 1st Embodiment of this invention. A side view showing a spinning unit and a thread joint carriage. The cross-sectional view which shows the structure of the air spinning apparatus. Schematic cross-sectional view of the air spinning device seen in the axial direction. A cross-sectional view of the spinning nozzle and its vicinity when the nozzle block is cut in a plane including the axis of the spinning nozzle. FIG. 5 is a cross-sectional view showing a modified example of a spinning nozzle. FIG. 3 is a cross-sectional view of the spinning nozzle and its vicinity when the nozzle block according to the second embodiment of the present invention is cut in a plane including the axis of the spinning nozzle. FIG. 5 is a cross-sectional view showing a modified example of a spinning nozzle.

Next, the air spinning machine 1 including the air spinning device 23 including the nozzle block 101 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the air spinning machine 1 includes a blower box 3, a prime mover box 5, a plurality of spinning units 7, and a thread joint carriage 9. The plurality of spinning units 7 are arranged side by side in a predetermined direction.

A blower 11 or the like that functions as a negative pressure source is arranged in the blower box 3.

A drive source (not shown), a central control device 13, a display unit 15, and an operation unit 17 are arranged in the prime mover box 5. The drive source provided in the prime mover box 5 includes a motor commonly used in the plurality of spinning units 7.

The central control device 13 centrally manages and controls each part of the air spinning machine 1. As shown in FIG. 2, the central control device 13 is connected to the unit control unit 19 included in each spinning unit 7 via a signal line (not shown). In the present embodiment, each spinning unit 7 includes a unit control unit 19, but a predetermined number (for example, two or four) spinning units 7 may share one unit control unit 19.

The display unit 15 can display the setting contents for the spinning unit 7 and / or the information regarding the state of each spinning unit 7.

Each spinning unit 7 mainly includes a draft device 21, an air spinning device 23, a yarn storage device (yarn drawing device) 25, and a take-up device 27, which are arranged in order from upstream to downstream. There is. Here, "upstream" and "downstream" mean upstream and downstream in the traveling direction of the sliver 32, the fiber bundle 34, and the spun yarn 30 at the time of winding the spun yarn (yarn) 30.

The draft device 21 is provided near the upper end of the frame 36 included in the air spinning machine 1. As shown in FIG. 2, the draft device 21 includes four draft roller pairs. The four draft roller pairs are a back roller pair 41, a third roller pair 43, a middle roller pair 45, and a front roller pair 47, which are arranged in order from upstream to downstream. An apron belt 49 is provided for each roller on the middle roller pair 45.

The draft device 21 stretches the sliver 32 supplied from the sliver case (not shown) until it reaches a predetermined fiber amount (or thickness) by sandwiching and transporting the sliver 32 between the rollers of each draft roller pair. Draft) to produce fiber bundles 34. The fiber bundle 34 generated by the draft device 21 is supplied to the air spinning device 23. Hereinafter, the point where the front roller pair 47 nip the fiber bundle 34 is referred to as a nip point.

The air spinning device 23 applies a swirling air flow to the fiber bundle 34 generated by the draft device 21 to twist and generate the spun yarn 30. The detailed configuration of the air spinning device 23 will be described later.

The yarn storage device 25 draws out the spun yarn 30 produced by the air spinning device 23. As shown in FIG. 2, the yarn storage device 25 includes a thread storage roller 53 and a motor 55.

The thread storage roller 53 is rotationally driven by the motor 55. The yarn storage roller 53 winds the spun yarn 30 around its outer peripheral surface and temporarily stores the spun yarn 30. The yarn storage roller 53 draws the spun yarn 30 from the air spinning apparatus 23 at a predetermined speed by rotating the spun yarn 30 around the outer peripheral surface at a predetermined rotation speed.

In this way, the yarn storage device 25 can temporarily store the spun yarn 30 on the outer peripheral surface of the yarn storage roller 53, and thus functions as a kind of buffer for the spun yarn 30. As a result, there is a problem that the spinning speed in the air spinning apparatus 23 and the winding speed (running speed of the spinning yarn 30 wound on the package 73 described later) do not match for some reason (for example, slack in the spinning yarn 30). Etc.) can be eliminated.

A yarn monitoring device 59 is provided between the air spinning device 23 and the yarn storage device 25. The spun yarn 30 produced by the air spinning device 23 passes through the yarn monitoring device 59 before being stored in the yarn storage device 25.

The yarn monitoring device 59 monitors the quality of the running spun yarn 30 with an optical sensor and detects a yarn defect contained in the spun yarn 30. As the yarn defect, for example, an abnormality in the thickness of the spun yarn 30 and a foreign substance contained in the spun yarn 30 can be considered. When the yarn monitoring device 59 detects a yarn defect of the spun yarn 30, it transmits a yarn defect detection signal to the unit control unit 19. The yarn monitoring device 59 may monitor the quality of the spun yarn 30 by using, for example, a capacitance type sensor instead of the optical sensor. Alternatively or in addition to these examples, the yarn monitoring device 59 may be configured to measure the tension of the spun yarn 30 as the quality of the spun yarn 30.

Upon receiving the yarn defect detection signal from the yarn monitoring device 59, the unit control unit 19 cuts the spun yarn 30 by stopping the drive of the air spinning device 23 and / or the draft device 21. That is, the air spinning device 23 functions as a cutting portion that cuts the spun yarn 30 when the yarn monitoring device 59 detects a yarn defect. The spinning unit 7 may be provided with a cutter for cutting the spinning yarn 30.

The take-up device 27 includes a cradle arm 61, a take-up drum 63, and a traverse guide 65. The cradle arm 61 is swingably supported around the support shaft 67, and can rotatably support the bobbin 71 (that is, the package 73) for winding the spun yarn 30. The take-up drum 63 rotates in contact with the bobbin 71 or the outer peripheral surface of the package 73 to rotationally drive the package 73 in the take-up direction. The take-up device 27 drives the take-up drum 63 by the electric motor shown in the figure while reciprocating the traverse guide 65 by the drive means shown in the figure. As a result, the take-up device 27 winds the spun yarn 30 around the package 73 while swinging the spun yarn 30.

As shown in FIG. 1, rails 81 are arranged on the frame 36 of the air spinning machine 1 along the direction in which a plurality of spinning units 7 are arranged. The thread joint carriage 9 is configured to be able to travel on the rail 81. As a result, the thread joint carriage 9 can be moved with respect to the plurality of spinning units 7. The yarn splicing carriage 9 travels to the spinning unit 7 where the yarn breakage or the yarn breakage has occurred, and performs the yarn splicing work for the spinning unit 7.

As shown in FIG. 1, the thread splicing carriage 9 includes a traveling wheel 83, a thread splicing device 85, a suction pipe 87, and a suction mouse 89. The thread joint carriage 9 further includes a carriage control unit 91 shown in FIG.

The suction pipe 87 can capture the spun yarn 30 produced by the air spinning apparatus 23 at the time of yarn spinning. Specifically, the suction pipe 87 can suck and capture the spun yarn 30 sent out from the air spinning device 23 by generating a suction air flow at the tip thereof. The suction mouse 89 can capture the spun yarn 30 wound in the package 73 of the winding device 27. Specifically, the suction mouse 89 can suck and capture the spun yarn 30 from the package 73 supported by the winding device 27 by generating a suction air flow at the tip thereof. The suction pipe 87 and the suction mouse 89 rotate while capturing the spun yarn 30 to guide the spun yarn 30 to a position where the spun yarn 30 can be introduced into the yarn splicing device 85.

The yarn splicing device 85 splics the spun yarn 30 from the air spinning device 23 guided by the suction pipe 87 and the spun yarn 30 from the package 73 guided by the suction mouse 89. In the present embodiment, the yarn splicing device 85 is a splicer device that twists yarn ends with each other by a swirling air flow. The thread splicing device 85 is not limited to the splicer device, and for example, a mechanical knotter or the like can be adopted. The thread splicing carriage 9 may connect the spun yarn 30 by piecing without providing the thread splicing device 85. That is, the yarn joint trolley 9 pulls out the spun yarn 30 from the package 73, sends it back to the air spinning device 23, and then starts the draft operation by the draft device 21 and the spinning operation by the air spinning device 23. The spun yarn 30 may be put into a continuous state again.

The carriage control unit 91 (see FIG. 2) is configured as a known computer having a CPU, ROM, RAM, etc. (not shown). The bogie control unit 91 controls the thread splicing work performed by the thread splicing bogie 9 by controlling the operation of each part included in the thread splicing bogie 9.

Next, the configuration of the air spinning apparatus 23 will be described in detail with reference to FIGS. 3 and 4.

The air spinning device 23 produces the spun yarn 30 using the fiber bundle 34 supplied from the draft device 21. As shown in FIG. 3, the air spinning device 23 includes a nozzle block 101 and a hollow guide shaft body 103. The nozzle block 101 has a main body portion 111 and a fiber guide portion 113.

In the nozzle block 101, the fiber guide portion 113 guides the fiber bundle 34 drafted by the draft device 21 toward the inside of the main body portion 111. Specifically, the fiber guide portion 113 has a first passage 115 through which the fiber bundle 34 can pass. The first passage 115 is provided so as to extend along the axial direction of the fiber guide portion 113 (the fiber traveling direction in which the fiber bundle 34 travels). The first passage 115 is connected to the swivel chamber 117 on the downstream end side. The first passage 115 faces the front roller pair 47 of the draft device 21 on the upstream end side. When the fiber bundle 34 generated by the draft device 21 is supplied to the air spinning device 23, the fiber bundle 34 is guided to the swirl chamber 117 through the first passage 115 in the fiber guide portion 113.

A needle-shaped member 107 is attached to the fiber guide portion 113. The fiber bundle 34 drafted by the draft device 21 is guided so as to be wound around the needle-shaped member 107 after passing through the first passage 115. The needle-shaped member 107 is provided so as to extend along the axial direction of the fiber guide portion 113, and is arranged so as to project from the flat surface 119 formed at the downstream end of the fiber guide portion 113 into the swivel chamber 117. A downstream end (exit) of the first passage 115 is arranged on the plane 119. The fiber guide portion 113 does not have to include the needle-shaped member 107.

The main body 111 is arranged on the downstream side of the fiber guide 113. The main body 111 has a hollow portion. The fiber bundle 34 passes through this hollow portion. The main body 111 is made of a ceramic or metal molded product (for example, aluminum die casting). When the main body 111 (including the wall surface of the spinning nozzle 123 described later) is a metal molded product, it is preferable that the main body 111 is coated with a predetermined coating (for example, a coating with a diamond-like carbon film or a ceramic coating). ..

A swivel chamber 117, which is a columnar space, is formed inside the main body 111. That is, as shown in FIG. 4, the swivel chamber 117 is formed so that the cross section cut along the plane perpendicular to the axial direction of the nozzle block 101 is circular. The main body 111 has an inner wall surface 121 which is a curved surface along the circumferential direction of the swivel chamber 117. The swivel chamber 117 is composed of a space surrounded by an inner wall surface 121 of the main body 111, a flat surface 119 of the fiber guide portion 113 shown in FIG. 3, and a tapered surface of the tapered portion 131 of the hollow guide shaft body 103 described later. Has been done. The axis of the swivel chamber 117 coincides with the axis of the nozzle block 101 and the axis of the hollow guide shaft 103.

The main body 111 is provided with a spinning nozzle (nozzle) 123. After passing through the spinning nozzle 123, the air spinning device 23 can eject air (compressed air) from the spinning nozzle 123 into the swirl chamber 117. The spinning nozzle 123 is formed as a through hole penetrating the main body 111, and extends in a direction inclined with respect to the axial center of the nozzle block 101. A spout 125 for ejecting air into the swirl chamber 117 is provided at one end of the spinning nozzle 123 in the longitudinal direction. The spout 125 opens toward the swivel chamber 117. At the other end of the spinning nozzle 123 in the longitudinal direction, an introduction port 127 into which the air supplied to the spinning nozzle 123 is introduced is provided. The introduction port 127 is connected to the air supply unit 129 shown in FIG. The air supply unit 129 is connected to a compressed air source (not shown), and air (compressed air) is supplied from this compressed air source. As a result, the air spinning device 23 ejects compressed air from the spinning nozzle 123 into the swirling chamber 117, and causes the swirling air flow to act on the fiber bundle 34 in the swirling chamber 117.

The hollow guide shaft body 103 is arranged on the downstream side with respect to the nozzle block 101. The hollow guide shaft body 103 is formed in a conical shape extending along the fiber traveling direction in which the fiber bundle 34 travels. The hollow guide shaft body 103 is arranged so as to face the fiber guide portion 113 of the nozzle block 101 at its upstream end. A conical tapered portion 131 is formed on the outer peripheral side of the upstream end portion of the hollow guide shaft body 103. The tapered portion 131 is arranged so as to face the swivel chamber 117, and is formed so that the outer diameter becomes smaller from the downstream side to the upstream side.

The hollow guide shaft body 103 has a second passage 133 through which the fiber bundle 34 guided from the first passage 115 in the nozzle block 101 passes. The second passage 133 is provided so as to extend along the axial direction (fiber traveling direction) of the hollow guide shaft body 103. The second passage 133 guides the fiber bundle 34 to the downstream side and sends it out as a spun yarn 30 from the downstream end (outlet) of the drawing to the outside of the air spinning device 23. The second passage 133 is connected to the swivel chamber 117 on the upstream end side.

The fiber bundle 34 is composed of a large number of fibers. Some of the fibers contained in the fiber bundle 34 are in a continuous state between the nip point of the front roller pair 47 and the hollow guide shaft body 103. Some fibers in this state are referred to as core fibers 34a. Another part of the fibers contained in the fiber bundle 34 is not continuous between the nip point of the front roller pair 47 and the hollow guide shaft 103. The downstream end of this type of fiber is twisted into the core fiber 34a, while the upstream end is the free end. The free end of each fiber introduced into the air spinning apparatus 23 is swirled downstream by the swirling air flow generated by the compressed air ejected from the spinning nozzle 123. By flowing the free end (upstream end) of each fiber to the downstream side in this way, the direction of the free end is "reversed" and faces the downstream side (lower side in FIG. 3). Since the inverted fiber winds around the core fiber 34a as described later, the inverted fiber is referred to as a wound fiber 34b.

The free end of the winding fiber 34b is affected by a swirling air flow spirally flowing around the hollow guide shaft 103 in the swirling chamber 117. As a result, the wound fiber 34b swivels around the outer peripheral surface of the hollow guide shaft body 103 along the outer peripheral surface (tapered surface) of the tapered portion 131. As a result, the wound fiber 34b is sequentially wound around the core fiber 34a.

The core fiber 34a is twisted along with the swirling winding fiber 34b. In this way, the winding fiber 34b is wound around the core fiber 34a, and the core fiber 34a is further twisted, so that the winding fiber 34b is twisted into the core fiber 34a and the spun yarn 30 is generated. ..

The twist of the core fiber 34a tries to propagate to the upstream side (front roller vs. 47 side), but the propagation is blocked by the needle-shaped member 107. As described above, the needle-shaped member 107 has a function as a twist propagation preventing means. When the air spinning device 23 does not include the needle-like member 107, the twist propagation preventing means is realized by the downstream end of the fiber guide 113.

A tapered surface 135 is formed on the main body 111 of the nozzle block 101 so as to be connected to the downstream end of the inner wall surface 121. The tapered surface 135 expands toward the downstream side, and the diameter of the space formed by the tapered surface 135 is larger toward the downstream side. By forming the tapered surface 135, the distance between the main body 111 and the hollow guide shaft 103 can be secured. As a result, the compressed air supplied to the swirl chamber 117 can be discharged.

Next, the configuration of the spinning nozzle 123 will be described in detail with reference to FIGS. 4 and 5. FIG. 4 shows a cross section obtained by cutting a part of the main body 111 on a plane inclined along the axis of the spinning nozzle 123. In the cross-sectional views after FIG. 5, the cut surface is similarly inclined.

In the nozzle block 101, at least one spinning nozzle 123 is formed in the main body 111. In the present embodiment, as shown in FIG. 4, four spinning nozzles 123 are provided in the main body 111. The four spinning nozzles 123 are arranged so that the angles between the adjacent spinning nozzles 123 in the circumferential direction of the swivel chamber 117 are equal. Specifically, the four spinning nozzles 123 are arranged at 90 ° intervals with respect to the axis of the swivel chamber 117.

When a plurality of spinning nozzles 123 are provided as in the present embodiment, the air ejected from the ejection port 125 of one spinning nozzle 123 hits the air ejected from the ejection port 125 of another spinning nozzle 123. Therefore, a swirling air flow can be generated on the upstream side in the fiber traveling direction with respect to the ejection port 125. As a result, a swirling air flow along the inner wall surface 121 can be generated in a wide range of the swirl chamber 117. If the number of spinning nozzles 123 is too large, the air ejected from the ejection port 125 may interfere with each other and the swirling air flow may be disturbed. Therefore, the number of spinning nozzles 123 is preferably 3 or more and 6 or less.

The spinning nozzle 123 is arranged so as to be inclined so as to be in the direction of the spiral tangent line about the axial direction of the nozzle block 101. One end of the spinning nozzle 123 in the axial direction (longitudinal direction) is provided with a spout 125 and opens toward the swirl chamber 117. The other end of the spinning nozzle 123 in the axial direction is provided with an introduction port 127 and is connected to an air supply unit 129. The spinning nozzle 123 is formed so that the cross-sectional shape cut along the plane perpendicular to the axial direction is circular. Since both the spout 125 and the introduction port 127 are open on a cylindrical surface, the contours of the openings have a complicated shape similar to an ellipse or the like.

As shown in FIG. 5, the axial direction of the spinning nozzle 123 between the point closest to the inlet 127 in the opening contour of the spout 125 and the point closest to the spout 125 in the opening contour of the spout 127. Is defined as the length L1 of the spinning nozzle 123. In the present embodiment, the length L1 of the spinning nozzle 123 is 1 mm or more and 8 mm or less. The length L1 of the spinning nozzle 123 is preferably 1 mm or more and 5 mm or less.

In the present embodiment, as shown in FIG. 4, each spinning nozzle 123 is partially formed along the inner wall surface 121 of the main body 111. Therefore, when air is ejected from the ejection port 125 of the spinning nozzle 123, a swirling air flow along the inner wall surface 121 can be generated. By allowing the swirling air flow along the inner wall surface 121 to act on the winding fiber 34b of FIG. 3, the winding fiber 34b swirls along the inner wall surface 121. The tension applied to 34b can be reduced. As a result, the winding fiber 34b can be easily wound uniformly around the core fiber 34a.

As shown in FIG. 5, the spinning nozzle 123 has a straight portion 151 and a diameter changing portion 153. In the spinning nozzle 123, the straight portion 151 is arranged on the one end side in the axial direction where the spout 125 is located, and the diameter changing portion 153 is arranged on the other end side in the axial direction where the introduction port 127 is located. In the following, paying attention to the air flow in the spinning nozzle 123, the side closer to the swirl chamber 117 in the axial direction of the spinning nozzle 123 may be referred to as the downstream side, and the side far from the swirl chamber 117 may be referred to as the upstream side. The downstream side can be rephrased as the spout 125 side, and the upstream side can be rephrased as the introduction port 127 side.

The straight portion 151 functions as an air outlet portion for the swirl chamber 117 in the spinning nozzle 123. The straight portion 151 is provided so as to extend linearly along the axial direction of the spinning nozzle 123. The straight portion 151 is formed as a round hole having a circular cross-sectional shape cut along a plane perpendicular to the axial direction of the spinning nozzle 123. The diameter of the straight portion 151 is constant in the axial direction of the straight portion 151.

As shown in FIG. 5, the axial distance of the spinning nozzle 123 between the point closest to the introduction port 127 of the opening contour of the spout 125 and the upstream end of the straight portion 151 is determined by the straight portion. It is defined as the length L2 of 151. The length L2 of the straight portion 151 is a value of 5 to 50% of the length L1 of the spinning nozzle 123. Specifically, the length L2 of the straight portion 151 is 0.4 mm or more and 4 mm or less. The length L2 of the straight portion 151 is a value of 20 to 40% of the length L1 of the spinning nozzle 123, and is preferably 0.4 mm or more and 1 mm or less.

The downstream end of the straight portion 151 is arranged so as to coincide with the downstream end of the spinning nozzle 123, and the ejection port 125 is provided at the end. The diameter of the contour obtained by projecting the opening contour of the spout 125 onto a plane perpendicular to the axial direction of the spinning nozzle 123 is defined as the diameter L3 of the spout 125. Normally, the diameter L3 of the spout 125 coincides with the diameter of the straight portion 151. The diameter L3 of the spout 125 is 0.4 mm or more and 0.8 mm or less. The diameter L3 of the spout 125 is preferably 0.6 mm or more and 0.8 mm or less.

The diameter changing portion 153 functions as an air inlet portion from the air supply portion 129 in the spinning nozzle 123. The diameter changing portion 153 is provided so as to extend in the axial direction of the spinning nozzle 123. The diameter changing portion 153 is arranged coaxially with the straight portion 151. The diameter changing portion 153 is connected to the upstream end portion of the straight portion 151 at the downstream end portion in the axial direction of the spinning nozzle 123. Hereinafter, the portion where the diameter changing portion 153 is connected to the straight portion 151 is referred to as a connecting portion 155. In the present embodiment, the upstream end of the diameter changing portion 153 is arranged so as to coincide with the upstream end of the spinning nozzle 123, and the introduction port 127 is arranged at the end.

The diameter changing portion 153 is formed so that the cross-sectional shape cut along the plane perpendicular to the axial direction is circular. The diameter changing portion 153 is formed so that the diameter increases linearly from the connecting portion 155 to the upstream side in the axial direction of the spinning nozzle 123. In the present embodiment, the diameter changing portion 153 is formed in a tapered shape in which the diameter on the upstream side is larger than the diameter on the downstream side and the diameter gradually increases from the downstream side to the upstream side. Therefore, the diameter of the diameter change portion 153 is the largest at the upstream end portion of the diameter change portion 153 where the introduction port 127 is located. The opening angle (taper angle) θ of the diameter changing portion 153 shown in FIG. 5 is set to be 5 degrees or more and 90 degrees or less.

Specifically, as shown in FIG. 4, a cutting plane that is a virtual plane including both a straight line A1 perpendicular to the axis of the nozzle block 101 and a straight line A2 corresponding to the axis 157 of the spinning nozzle 123. Define P1. When the cross-sectional contour of the main body 111 cut on the cutting plane P1 is viewed, as shown in FIG. 5, the connecting portion 155 and the diameter changing portion 153 are located on both sides of the spinning nozzle 123 with the axis 157 in between. The virtual straight line connecting the upstream end portion (the portion where the introduction port 127 is located in the example of FIG. 5) is inclined by a predetermined angle with respect to the axial center 157 of the spinning nozzle 123. The opening angle θ is defined as the angle formed by the two virtual straight lines. The opening angle θ is set to 5 degrees or more and 90 degrees or less. The opening angle θ is preferably 10 degrees or more and 20 degrees or less.

As shown in FIG. 6, the diameter changing portion 153 can be provided with a short length only in the vicinity of the upstream end portion (the portion where the introduction port 127 is located) of the spinning nozzle 123. In this case, it is preferable that the diameter changing portion 153 is formed so as to have an R shape (arc shape). In FIG. 6, the region of the upstream end portion of the straight portion 151 includes the inclined portion. In this case, the length L2 of the straight portion 151 is the point closest to the introduction port 127 in the opening contour of the ejection port 125. The axial distance of the spinning nozzle 123 between the most downstream point of the region.

As described above, the nozzle block 101 of the present embodiment is used in the air spinning device 23 for generating yarn by causing a swirling air flow to act on the fiber bundle 34. The nozzle block 101 includes a main body portion 111 and a fiber guide portion 113. The main body 111 has a swivel chamber 117 and a spinning nozzle 123 through which the air ejected into the swivel chamber 117 passes. The fiber guide portion 113 is provided with respect to the main body portion 111 and guides the fiber bundle 34 toward the swivel chamber 117. The spinning nozzle 123 includes a straight portion 151 and a diameter changing portion 153. The straight portion 151 has a spout 125 located at one end in the axial direction of the spinning nozzle 123 and facing the swirl chamber 117, and is provided so as to extend in the axial direction of the spinning nozzle 123. The diameter changing portion 153 is connected to the straight portion 151 on the side opposite to the ejection port 125 in the axial direction of the spinning nozzle 123. The diameter of the diameter changing portion 153 expands from the connecting portion 155 between the straight portion 151 and the diameter changing portion 153 toward the other end side in the axial direction of the spinning nozzle 123. The length L2 of the straight portion 151 in the axial direction of the spinning nozzle 123 is 0.4 mm or more and 4 mm or less. The opening angle θ of the diameter changing portion 153 is 5 degrees or more and 90 degrees or less.

Thereby, the pressure loss with respect to the air passing through the spinning nozzle 123 can be reduced. Therefore, high-speed spinning can be realized without increasing or increasing the air pressure supplied to the spinning nozzle 123. Further, since the straight portion 151 is present in the spinning nozzle 123, the spinning nozzle 123 can be easily produced.

In the nozzle block 101 of the present embodiment, the length L2 of the straight portion 151 in the axial direction of the spinning nozzle 123 is preferably 0.4 mm or more and 1 mm or less.

Thereby, the air can be ejected from the ejection port 125 to the swirl chamber 117 in a state where the flow velocity of the air is sufficiently increased.

In the nozzle block 101 of the present embodiment, the opening angle θ of the diameter changing portion 153 is preferably 10 degrees or more and 20 degrees or less.

As a result, the flow velocity of the air introduced into the straight portion 151 can be increased.

In the nozzle block 101 of the present embodiment, the diameter changing portion 153 has an introduction port 127. The introduction port 127 is located at the other end in the axial direction of the spinning nozzle 123, and the air supplied to the spinning nozzle 123 is introduced. The diameter change portion 153 is formed in a tapered shape having the largest diameter at the introduction port 127.

As a result, the spinning nozzle 123 can be made smaller in the main body portion 111 than the conventional nozzle composed of two straight portions having different diameters. Further, it is possible to avoid a decrease in strength of the main body 111 due to the formation of the spinning nozzle 123.

In the nozzle block 101 of the present embodiment, the length L1 of the spinning nozzle 123 in the axial direction of the spinning nozzle 123 is 1 mm or more and 8 mm or less.

As a result, air flows satisfactorily toward the ejection port 125 at the spinning nozzle 123.

In the nozzle block 101 of the present embodiment, the number of spinning nozzles 123 is 3 or more and 6 or less. The diameter L3 of the spout 125 is 0.4 mm or more and 0.8 mm or less.

As a result, the air ejected from the ejection port 125 of one spinning nozzle 123 hits the air ejected from the ejection port 125 of another spinning nozzle 123, and is upstream of the ejection port 125 in the fiber traveling direction (upper side of FIG. 3). ) Can also generate a swirling air flow. Therefore, a swirling air flow along the inner wall surface 121 can be generated in a wide range of the swivel chamber 117. Further, by not increasing the number of spinning nozzles 123 too much, the turbulence of the swirling air flow can be reduced.

In the nozzle block 101 of the present embodiment, the main body 111 is made of a ceramic or coated metal molded product.

As a result, sufficient strength can be secured for the main body 111 having the spinning nozzle 123.

In the present embodiment, the air spinning device 23 includes a nozzle block 101 and a hollow guide shaft body 103. A fiber bundle guided from the nozzle block 101 passes through the hollow guide shaft body 103.

Thereby, in the air spinning apparatus 23, the pressure loss with respect to the air passing through the spinning nozzle 123 can be reduced. Therefore, high-speed spinning can be realized without increasing or increasing the air pressure supplied to the spinning nozzle 123. Further, in the spinning nozzle 123, the spinning nozzle 123 can be easily produced due to the presence of the straight portion 151.

In the present embodiment, the air spinning machine 1 includes an air spinning device 23, a yarn storage device 25, and a winding device 27. The yarn storage device 25 draws the spun yarn 30 from the air spinning device 23. The take-up device 27 winds the spun yarn 30 from the yarn storage device 25 to form the package 73.

As a result, in the air spinning apparatus 23 of the air spinning machine 1, the pressure loss with respect to the air passing through the spinning nozzle 123 can be reduced. Therefore, high-speed spinning can be realized without increasing the air pressure supplied to the spinning nozzle 123. As a result, the formation speed of the package 73 by the air spinning machine 1 can also be improved.

Next, the second embodiment will be described. In the description of the present embodiment, the same or similar members as those in the above-described embodiment may be designated by the same reference numerals in the drawings, and the description may be omitted.

As shown in FIG. 7, in the present embodiment, the spinning nozzle 123 includes a straight portion 161 different from the straight portion 151 in addition to the straight portion 151 and the diameter changing portion 153. As described above, the diameter changing portion 153 is formed in a tapered shape. The diameter changing portion 153 may be formed in an arc shape. Another straight portion 161 functions as an air inlet portion of the spinning nozzle 123 from the air supply portion 129. Another straight portion 161 is provided on the most upstream side (air supply portion 129 side) in the axial direction of the spinning nozzle 123. Another straight portion 161 is arranged on the upstream side of the spinning nozzle 123 with respect to the diameter changing portion 153. In other words, another straight portion 161 is arranged on the side opposite to the straight portion 151 with respect to the diameter changing portion 153 in the axial direction of the spinning nozzle 123.

In the present embodiment, another straight portion 161 is formed so as to extend linearly in the axial direction of the spinning nozzle 123. Another straight portion 161 is arranged coaxially with each of the straight portion 151 and the diameter changing portion 153. The downstream end of another straight portion 161 is connected to the upstream end (largest diameter portion) of the diameter changing portion 153. The upstream end of another straight portion 161 is arranged so as to coincide with the upstream end of the spinning nozzle 123, and the introduction port 127 is arranged at the end.

Another straight portion 161 is formed as a round hole having a circular cross-sectional shape cut along a plane perpendicular to the axial direction of the spinning nozzle 123. The diameter of the other straight portion 161 is substantially constant in the axial direction of the other straight portion 161. The diameter of the other straight portion 161 is larger than the diameter of the straight portion 151, and is substantially the same as the diameter of the outermost axial end portion (the largest diameter portion) of the diameter changing portion 153. ..

As described above, in the present embodiment, another straight portion 161 that functions as an air inlet portion has a diameter larger than the diameter of the straight portion 151 that functions as an air outlet portion. Another straight portion 161 and a straight portion 151 are smoothly connected by a diameter changing portion 153. As a result, according to the nozzle block of the present embodiment, the same effect as that of the first embodiment can be obtained.

As shown in FIG. 8, the diameter changing portion 153 may be formed so that the diameter increases in a curved shape such as an arc as it goes upstream from the connecting portion 155. In the example of FIG. 8, the wall surface 163 of the diameter changing portion 153 is formed on a curved surface (curved surface that bulges inward) that is convex toward the axis 157 side (inside) of the spinning nozzle 123. That is, when looking at the cross section obtained by cutting the main body portion 111 on the cutting plane P1, in this cross section, the connecting portion 155 between the diameter changing portion 153 and the straight portion 151, and the diameter changing portion 153 and another straight portion 161 The wall surface 163 is located on the axial center 157 side of the spinning nozzle 123 with respect to the virtual straight line connecting the connecting portion 165 of the above. At this time, the angle formed by the two virtual straight lines located on both sides of the axis 157 of the spinning nozzle 123 is set to 5 degrees or more and 90 degrees or less as the opening angle θ of the diameter changing portion 153.

As described above, in the nozzle block of the present embodiment, the spinning nozzle 123 further includes another straight portion 161. Another straight portion 161 has a diameter larger than the diameter of the straight portion 151, and is connected to the diameter changing portion 153 on the opposite side to the straight portion 151. The diameter changing portion 153 is formed in a tapered shape (or an arc shape).

As a result, air flows well even in the diameter changing portion 153.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example. The above embodiment and the following modifications can be combined as appropriate.

In the above embodiment, the main body 111 and the fiber guide 113 are configured as separate members in the nozzle block 101, but the main body 111 and the fiber guide 113 may be integrally configured.

In the above embodiment, it has been described that the swivel chamber 117 is a columnar space. However, the swivel chamber 117 may be formed in a tapered shape having one step or two or more steps. Each part of the air spinning device 23 is not limited to the shape shown in the figure, and may be formed in an appropriate shape.

The diameter changing portion 153 may be composed of a plurality of tapered portions that are smoothly continuous in the axial direction of the spinning nozzle 123. In this case, the opening angle of each tapered portion is set to the above-mentioned opening angle θ. That is, in the diameter changing portion 153, the opening angle θ may be changed between the one end side and the other end side in the axial direction of the spinning nozzle 123.

In the above embodiment, the yarn drawing device for drawing out the spun yarn 30 from the air spinning apparatus 23 is a yarn storage device 25, but the present invention is not limited to this, and an apparatus including a delivery roller pair may be used. It may be an apparatus including an apparatus and a yarn storage apparatus. When the spun yarn 30 is pulled out from the air spinning device 23 by the delivery roller and the nip roller, a slack tube using a suction air flow, a mechanical compensator, or the like may be provided instead of the yarn storage device 25.

In the above embodiment, each device is arranged so that the yarn supplied on the upper side is wound on the lower side in the height direction of the air spinning machine 1. However, each device may be arranged so that the yarn supplied on the lower side is wound on the upper side.

In the air spinning machine 1, at least one of the bottom rollers of the draft device 21 and the traverse guide 65 were driven by power from each drive source of the prime mover box 5 (that is, common to the plurality of spinning units 7). However, each part of the spinning unit 7 (for example, the draft device 21, the air spinning device 23, the winding device 27, etc.) may be driven independently for each spinning unit 7.

The air spinning machine 1 may not include the yarn splicing carriage 9, and each spinning unit 7 may include a device related to the yarn splicing.

Considering the above teachings, it is clear that the present invention can take many modified and modified forms. Therefore, it should be understood that the present invention may be practiced in a manner other than that described herein, within the scope of the appended claims.

1 Pneumatic spinning machine 23 Pneumatic spinning device 25 Yarn storage device (yarn drawing device)
27 Winding device 30 Spinned yarn (yarn)
34 Fiber bundle 101 Nozzle block 103 Hollow guide shaft 111 Main body 113 Fiber guide 117 Swing chamber 123 Spinning nozzle (nozzle)
125 Spout 151 Straight part 153 Diameter change part 161 Another straight part

Claims (10)

A nozzle block used in an air spinning device that produces yarn by applying a swirling air flow to a fiber bundle.
The main body with a swivel chamber and
A fiber guide provided for the main body and
With
A nozzle through which the air ejected into the swivel chamber passes is formed in the main body.
The fiber guide unit guides the fiber bundle toward the swivel chamber, and guides the fiber bundle toward the swivel chamber.
The nozzle
A straight portion having a spout located at one end in the axial direction of the nozzle and facing the swivel chamber, and a straight portion provided so as to extend in the axial direction of the nozzle.
A diameter changing portion that is connected to the straight portion on the side opposite to the ejection port in the axial direction of the nozzle and whose diameter expands from the connecting portion with the straight portion toward the other end side in the axial direction of the nozzle.
With
The length of the straight portion in the axial direction of the nozzle is 0.4 mm or more and 4 mm or less.
A nozzle block characterized in that the opening angle of the diameter changing portion is 5 degrees or more and 90 degrees or less. The nozzle block according to claim 1.
A nozzle block characterized in that the length of the straight portion in the axial direction of the nozzle is 0.4 mm or more and 1 mm or less. The nozzle block according to claim 1 or 2.
A nozzle block characterized in that the opening angle of the diameter changing portion is 10 degrees or more and 20 degrees or less. The nozzle block according to any one of claims 1 to 3.
The diameter changing portion has an introduction port located at the other end in the axial direction of the nozzle and into which air supplied to the nozzle is introduced, and is formed in a tapered shape having the largest diameter at the introduction port. Nozzle block characterized by being. The nozzle block according to any one of claims 1 to 3.
The nozzle
Further provided with another straight portion having a diameter larger than the diameter of the straight portion and connected to the diameter changing portion on the opposite side to the straight portion.
The nozzle block is characterized in that the diameter changing portion is formed in a tapered shape or an arc shape. The nozzle block according to any one of claims 1 to 5.
A nozzle block characterized in that the length of the nozzle in the axial direction of the nozzle is 1 mm or more and 8 mm or less. The nozzle block according to any one of claims 1 to 6.
The number of the nozzles is 3 or more and 6 or less.
A nozzle block having a spout having a diameter of 0.4 mm or more and 0.8 mm or less. The nozzle block according to any one of claims 1 to 7.
The nozzle block is characterized in that the main body is made of a ceramic or coated metal molded product. The nozzle block according to any one of claims 1 to 8 and the nozzle block.
A hollow guide shaft through which the fiber bundle guided from the nozzle block passes, and
An air spinning device characterized by being equipped with. The air spinning apparatus according to claim 9,
A yarn drawing device that pulls out the yarn from the air spinning device,
A winding device that winds the thread from the thread drawing device to form a package, and a winding device.
An air spinning machine characterized by being equipped with.

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