阅读说明：本技术 气流纺纱机 (Rotor spinning machine ) 是由 重山昌澄 于 2021-05-20 设计创作，主要内容包括：本发明提供一种气流纺纱机,具备牵伸装置(21)、气流纺纱装置(23)、纱线存积装置(25)、纱线干预装置(27)、吸引装置(29)以及卷取装置(31)。气流纺纱装置(23)通过捻回气流对由牵伸装置(21)牵伸后的纱条(35)即纤维束(37)加捻而生成纺纱(33)。纱线存积装置(25)暂时存积纺纱。纱线干预装置(27)对纺纱进行干预。吸引装置(29)构成为能够吸引纺纱。卷取装置(31)卷取纺纱而形成卷装(93)。从高位置朝低位置依次配置牵伸装置、气流纺纱装置、纱线存积装置、纱线干预装置、吸引装置以及卷取装置。纱线干预装置(27)是上蜡装置(65)及纱线行进传感器(67)。(The invention provides a rotor spinning machine, which is provided with a drafting device (21), a rotor spinning device (23), a yarn accumulating device (25), a yarn interfering device (27), a suction device (29) and a winding device (31). The air-jet spinning device (23) twists a fiber bundle (37) which is a sliver (35) drafted by the draft device (21) by a whirling airflow to produce a spun yarn (33). The yarn accumulating device (25) temporarily accumulates the spun yarn. A yarn intervention device (27) intervenes in the spinning. The suction device (29) is configured to be capable of sucking the spun yarn. A winding device (31) winds the spun yarn to form a package (93). A draft device, an air spinning device, a yarn accumulating device, a yarn interfering device, a suction device, and a winding device are arranged in this order from a high position to a low position. The yarn intervention device (27) is a waxing device (65) and a yarn travel sensor (67).)

1. A rotor spinning machine is characterized by comprising:

a drafting device for drafting the fiber bundle;

a spinning device that twists the fiber bundle drafted by the draft device with a whirling airflow to generate a yarn;

a yarn accumulating device arranged at a position lower than the spinning device and temporarily accumulating the yarn produced by the spinning device;

a yarn intervention device disposed at a position lower than the yarn accumulating device and configured to intervene on the yarn; and

a winding device disposed at a position lower than the yarn interfering device, for winding the yarn to form a package,

the yarn intervention device is a yarn processing device and/or a yarn detection device,

the rotor spinning machine further includes a suction device disposed at a position lower than the yarn interfering device and higher than the winding device and configured to be capable of sucking the yarn,

the suction device has a suction port opened to the yarn passage through which the yarn advances between the yarn interfering device and the winding device.

2. Rotor spinning machine according to claim 1,

the yarn accumulating device includes a yarn accumulating roller for accumulating the yarn by winding the yarn around an outer peripheral surface,

the suction device is disposed at a yarn catching interval having a predetermined interval in a vertical direction with respect to the yarn accumulating device, the yarn catching interval being a space for allowing the yarn unwound from the yarn accumulating roller to pass through after the yarn is cut between the spinning device and the winding device, and securing a length of the caught yarn,

the yarn interfering device is provided in a space between the yarn accumulating device and the suction device corresponding to the yarn catching interval.

3. Rotor spinning machine according to claim 1 or 2,

the distance between the yarn accumulating device and the suction device is 50mm to 150mm in the traveling direction of the yarn.

4. Rotor spinning machine according to one of the claims 1 to 3,

the yarn intervention device includes, as the yarn processing device, a waxing device capable of holding wax applied to the yarn.

5. Rotor spinning machine according to one of the claims 1 to 4,

the yarn intervention device is provided with a sensor for detecting the presence or absence of the yarn as the yarn detection device.

6. Rotor spinning machine according to one of the claims 1 to 5,

the suction port is fixedly disposed in a direction along the yarn passage.

7. Rotor spinning machine according to one of the claims 1 to 6,

the suction port is formed long in a direction along the yarn passage.

8. Rotor spinning machine according to one of the claims 1 to 7,

the suction device has a changing part capable of changing the suction state of the suction device.

9. Rotor spinning machine according to any of claims 1 to 8, characterized by the fact that it comprises:

a yarn splicing device that splices the yarn on the spinning device side and the yarn on the winding device side between the spinning device and the winding device when the yarn is cut off between the spinning device and the winding device; and

a yarn catching and guiding device for catching the yarn on the spinning device side and guiding the yarn to the yarn splicing device,

in the case of the splicing, the splicing device is disposed between the suction device and the winding device in the vertical direction.

10. Rotor spinning machine according to one of the claims 1 to 8,

the spinning device is provided with a plurality of spinning units,

each of the spinning units includes the spinning device, the yarn accumulating device, the yarn interfering device, the suction device, and the winding device,

each of the spinning units further includes:

a yarn splicing device which is arranged between the suction device and the winding device in a vertical direction and splices the yarn on the spinning device side and the yarn on the winding device side between the spinning device and the winding device; and

and a yarn catching and guiding device for catching the yarn on the spinning device side and guiding the yarn to the yarn splicing device.

11. Rotor spinning machine according to one of the claims 1 to 10,

the draft device is provided with a plurality of draft devices,

each of the draft devices includes a plurality of driving rollers,

all the drive rollers constituting the draft device are driven independently of the drive rollers of the other draft devices.

Technical Field

The invention relates to a rotor spinning machine.

Background

Conventionally, there is known a rotor spinning machine including a yarn splicing device for performing yarn splicing when yarn breakage occurs. Patent document 1 discloses such a spinning machine.

The spinning machine disclosed in jp 05-064172 a includes a spinning nozzle, a piecing device, and a winding device. The yarn splicing device is disposed downstream of the spinning nozzle in the yarn advancing direction. The yarn splicing device includes a package side yarn end catching device, a spinning unit side yarn end catching device, a yarn splicing member, and the like. The suction nozzle of the package side yarn end catching device is provided with a yarn end suction inlet. The yarn end suction port can suck the yarn on the package (winding device) side.

The spinning machine of japanese unexamined patent publication No. h 05-064172 includes a relaxation tube that sucks and holds the yarn on the package side until the yarn splicing starts when a yarn defect or the like is found. When a yarn defect or the like is found, the yarn on the package side stops traveling before being wound into the package. As a result, the yarn on the package side is sucked by the suction airflow of the relaxation tube, and is stretched between the relaxation tube and the package.

The suction nozzle catches the yarn on the package side in this state and guides the yarn to the joint member. The yarn on the package side is pieced by the piecing member to the yarn on the spinning unit side guided by the spinning-unit-side yarn end catching device.

In the structure of japanese unexamined patent application publication No. h 05-064172, two rollers that feed the yarn between them are disposed downstream of the spinning nozzle. Hereinafter, these two rollers may be referred to as feed rollers. The suction port of the slacking off pipe is disposed downstream of the feed roller and relatively close to the feed roller. Therefore, for example, when the yarn is broken in the spinning nozzle portion, the yarn end passes through the suction port of the slackening tube immediately after being separated from the delivery roller.

Thus, in the layout of japanese utility model application laid-open No. h 05-064172, there is substantially no chance that the yarn on the package side is sucked by the suction airflow of the relaxation tube, and it is difficult to reliably catch the yarn in the relaxation tube.

Disclosure of Invention

The invention aims to provide a spinning machine which can reliably catch yarn on a winding device side when yarn breakage occurs.

According to an aspect of the present invention, there is provided a rotor spinning machine configured as follows. That is, the rotor spinning machine includes a draft device, a spinning device, a yarn accumulating device, a yarn interfering device, a suction device, and a winding device. The draft device generates a fiber bundle. The spinning device is disposed at a position lower than the yarn interfering device, and twists the fiber bundle generated by the draft device by a whirling airflow to generate a yarn. The yarn accumulating device is disposed at a position lower than the spinning device, and temporarily accumulates the yarn produced by the spinning device. The yarn intervention device is disposed at a position lower than the yarn accumulating device, and intervenes on the yarn. The suction device is disposed at a position lower than the yarn interfering device and higher than the winding device, and the suction device has a suction port that opens toward a yarn passage through which the yarn travels between the yarn interfering device and the winding device. This configuration enables the yarn to be sucked. The winding device is disposed at a position lower than the suction device, and winds the yarn to form a package. The yarn intervention device is a yarn processing device and/or a yarn detection device.

Thus, when the yarn breakage occurs between the spinning device and the winding device, the yarn on the winding device side can be reliably caught by the suction device. Further, since the yarn interfering device is disposed in the space between the yarn accumulating device and the suction device, the space does not become a dead space in the rotor spinning machine.

The above rotor spinning machine preferably has the following configuration. That is, the yarn accumulating device includes a yarn accumulating roller that accumulates the yarn by winding the yarn around an outer peripheral surface. The suction device is disposed at a yarn catching interval having a predetermined interval in the vertical direction with respect to the yarn accumulating device. The yarn catching intervals are as follows: and a yarn take-up device for taking up the yarn from the yarn accumulating roller after the yarn is cut between the spinning device and the winding device, and for passing the yarn, and for securing a length of the caught yarn. The yarn interfering device is provided in a space between the yarn accumulating device and the suction device corresponding to the yarn catching interval.

This can sufficiently secure the distance between the yarn accumulating device and the suction device. Therefore, the length of the yarn on which the suction flow for catching by the suction device acts can be substantially increased. As a result, the yarn can be easily caught by the suction device. Further, by disposing the yarn interfering device in a space corresponding to the distance secured for this purpose, the space can be effectively used.

In the rotor spinning machine, it is preferable that an interval between the yarn accumulating device and the suction device is 50mm to 150mm in a traveling direction of the yarn.

This makes it possible to reliably capture the yarn by the suction device while maintaining the compactness of the structure, and to ensure a space for disposing the yarn intervention device.

In the above rotor spinning machine, it is preferable that the yarn intervention device includes, as the yarn processing device, a waxing device capable of holding wax applied to the yarn.

Thus, the waxing device can be laid out with high space efficiency. Since the waxing device has a fixed length, the suction device can be disposed separately from the yarn accumulating device, and the yarn can be easily caught by the suction device.

In the above rotor spinning machine, it is preferable that the yarn interfering device includes a sensor for detecting the presence or absence of the yarn as the yarn detecting device.

This enables a space-efficient layout of the sensors. Since the sensor for detecting the presence or absence of the yarn is a device having a certain length, the suction device can be disposed separately from the yarn accumulating device, and the yarn can be easily caught by the suction device.

The above rotor spinning machine preferably has the following configuration. That is, the suction device includes a suction port that opens to a yarn path running toward the yarn between the yarn interfering device and the winding device. The suction port is fixedly disposed in a direction along the yarn passage. The suction port is formed long in a direction along the yarn passage.

This makes it easy to catch the yarn on the winding device side through the suction port.

The rotor spinning machine preferably includes a changing unit capable of changing a suction state of the suction device.

Thus, for example, at the time of normal winding in which yarn breakage does not occur, the suction device can be made not to act on the yarn. Thus, energy saving can be achieved in the rotor spinning machine.

The above rotor spinning machine preferably has the following configuration. That is, the rotor spinning machine includes a yarn splicing device and a yarn catching and guiding device. When the yarn breakage occurs between the spinning device and the winding device, the yarn splicing device splices the yarn on the spinning device side and the yarn on the winding device side between the spinning device and the winding device. The yarn catching and guiding device catches the yarn on the spinning device side and guides the yarn to the yarn splicing device. In the case of the splicing, the splicing device is disposed between the suction device and the winding device in the vertical direction.

Thus, the yarn on the winding device side is not physically affected by the yarn intervening device or the like at the time of piecing. Thus, the joint can be smoothly performed.

The above rotor spinning machine preferably has the following configuration. That is, the rotor spinning machine includes a plurality of spinning units. Each spinning unit includes the spinning device, the yarn accumulating device, the yarn interfering device, the suction device, and the winding device. Each of the spinning units further includes a yarn splicing device and a yarn catching and guiding device. The yarn splicing device is disposed between the suction device and the winding device in a vertical direction, and splices the yarn on the spinning device side and the yarn on the winding device side between the spinning device and the winding device. The yarn catching and guiding device catches the yarn on the spinning device side and guides the yarn to the yarn splicing device.

Thus, when a yarn breakage occurs between the spinning device and the winding device in a certain spinning unit, the yarn splicing operation can be completed in the spinning unit and the spinning can be restarted.

The above rotor spinning machine preferably has the following configuration. That is, the rotor spinning machine includes a plurality of the draft devices. Each of the draft devices includes a plurality of drive rollers. All the drive rollers constituting the draft device are driven independently of the drive rollers of the other draft devices.

This allows the drive of each drive roller of the draft device to be controlled independently and flexibly from the other draft devices.

Drawings

Fig. 1 is a front view showing an entire configuration of a rotor spinning machine according to an embodiment of the present invention.

Fig. 2 is a side view showing a spinning unit of the rotor spinning machine of fig. 1.

Fig. 3 is a front view showing a suction port of the suction device.

Fig. 4 is a side view showing a state where the spun yarn is broken in the spinning unit and the yarn splicing cart is advanced to the spinning unit.

Fig. 5 is a side view showing a state where the spun yarn is guided to the yarn splicing device provided in the yarn splicing cart.

Detailed Description

An air spinning machine 1 according to an embodiment of the present invention will be described with reference to the drawings.

As shown in fig. 1, the air-jet spinning machine 1 includes a blower case 3, a power box 5, a plurality of spinning units 7, and a yarn joining cart 9. The plurality of spinning units 7 are arranged in a predetermined direction.

A blower 11 and the like that function as a negative pressure source are disposed in the blower case 3.

The power box 5 is provided with a drive source (not shown), a central control unit 13, a display unit 15, and an operation unit 17. The drive source provided in the power box 5 includes an electric motor commonly used in the plurality of spinning units 7.

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

The display unit 15 can display information on the setting contents for the spinning units 7 and/or the states of the spinning units 7. The operator operates the operation unit 17 to perform setting of the rotor spinning machine 1 and/or selection of information displayed on the display unit 15. The display unit 15 and the operation unit 17 may be constituted by a touch panel display.

As also shown in fig. 2, each spinning unit 7 mainly includes a draft device 21, an air-jet spinning device (spinning device) 23, a yarn accumulating device 25, a yarn interfering device 27, a suction device 29, and a winding device 31, which are arranged in this order from upstream to downstream. Here, "upstream" and "downstream" mean, unless otherwise mentioned, the sliver (fiber bundle) 35, the fiber bundle 37, and the upstream and downstream in the traveling direction of the spun yarn 33 at the time of winding the spun yarn 33.

The draft device 21 is provided above the spinning unit 7 (rotor spinning machine 1). The draft device 21 includes a plurality of draft rollers. Of the plurality of draft rollers, two draft rollers constitute a draft roller pair. In the present embodiment, the draft device 21 includes a plurality of draft roller pairs.

Specifically, the draft device 21 includes four draft roller pairs. The four draft roller pairs are a rear roller pair 41, a third roller pair 43, an intermediate roller pair 45, and a front roller pair 47 arranged in this order from upstream to downstream. A tangential belt 49 is provided on each of the draft rollers of the intermediate roller pair 45.

The four draft roller pairs each have a drive roller and a driven roller that face each other. The driving roller and the driven roller correspond to draft rollers. The four draft roller pairs are provided with drive sources such as motors, not shown, independently for the respective drive rollers. Each of the driving rollers is driven by a driving source to rotate about an axis of the driving roller. The driven roller of each draft roller pair is provided so as to be rotatable about its axis via a bearing or the like, not shown.

The drive roller of each draft roller pair is independently rotationally driven from the drive rollers of the other draft roller pairs. Further, each of the four driving rollers is independently rotationally driven with respect to the driving rollers in the other draft devices 21. In this way, the draft device 21 is configured as a single spindle drive type draft device. However, at least one of the driving roller of the front roller pair 47 and the driving roller of the intermediate roller pair 45 may be driven at the same time by a driving source provided in common to the plurality of spinning units 7. In each spinning unit 7, the driving roller of the rear roller pair 41 and the driving roller of the third roller pair 43 may be driven by a single motor.

The draft device 21 sandwiches and conveys the sliver 35 supplied from a sliver box (not shown) between the draft rollers (between the driving roller and the driven roller) of each draft roller pair, and thereby stretches (drafts) the sliver to a predetermined fiber amount (or thickness) to generate the fiber bundle 37. The fiber bundle 37 generated by the draft device 21 is supplied to the air-jet spinning device 23.

The air-jet spinning device 23 applies a whirling airflow to the fiber bundle 37 (drafted sliver 35) generated by the draft device 21, thereby twisting the fiber bundle to generate the spun yarn 33. The air spinning device 23 is disposed substantially below the draft device 21 on the downstream side thereof in the height direction of the air spinning machine 1 (spinning unit 7).

The yarn accumulating device 25 temporarily accumulates the spun yarn 33 produced by the air-jet spinning device 23. The yarn accumulating device 25 is disposed substantially below the air-jet spinning device 23 on the downstream side thereof. The yarn accumulating device 25 includes a yarn accumulating roller 53, an electric motor 55, a yarn hooking member 57, and a yarn guide 59.

The yarn accumulating roller 53 is rotationally driven by an electric motor 55. The yarn accumulating roller 53 temporarily accumulates the spun yarn 33 by winding it around the outer peripheral surface thereof. The yarn accumulating roller 53 is rotated at a predetermined rotation speed in a state where the spun yarn 33 is wound around the outer circumferential surface, and thereby the spun yarn 33 can be pulled out from the air-jet spinning device 23 at a predetermined speed.

The yarn hooking member 57 can hook the spun yarn 33. The yarn hooking member 57 is rotated integrally with the yarn accumulating roller 53 in a state where the spun yarn 33 is hooked, thereby guiding the spun yarn 33 to the outer peripheral surface of the yarn accumulating roller 53.

The yarn guide 59 is disposed slightly below the yarn accumulating roller 53 on the downstream side thereof. The yarn guide 59 is configured to regulate the trajectory of the spun yarn 33 waved by the rotating yarn hooking member 57, and to stabilize a yarn path on the downstream side (lower side) of the yarn guide 59 in the yarn path in which the spun yarn 33 travels, thereby guiding the spun yarn 33.

The yarn accumulating device 25 can temporarily accumulate the spun yarn 33 on the outer peripheral surface of the yarn accumulating roller 53, and thus functions as a buffer for the spun yarn 33. This eliminates a problem (e.g., loosening of the spun yarn 33) caused by a difference in the spinning speed and the winding speed (the traveling speed of the spun yarn 33 wound into the package 93 described later) in the air-jet spinning device 23 due to some cause.

A yarn monitoring device 63 is provided between the air-jet spinning device 23 and the yarn accumulating device 25. The spun yarn 33 produced by the air-jet spinning device 23 passes through the yarn monitoring device 63 before being accumulated in the yarn accumulating device 25.

The yarn monitoring device 63 monitors the quality of the advancing spun yarn 33 by an optical sensor, and detects a yarn defect included in the spun yarn 33. The yarn defect includes, for example, an abnormality in the thickness of the spun yarn 33 and/or a foreign substance contained in the spun yarn 33. When detecting a yarn defect in the spun yarn 33, the yarn monitoring device 63 transmits a yarn defect detection signal to the unit control section 19. The yarn monitoring device 63 may monitor the quality of the spun yarn 33 using, for example, a capacitance-type sensor instead of the optical sensor. Instead of or in addition to these examples, the yarn monitoring device 63 may be configured to measure the tension of the spun yarn 33 as the quality of the spun yarn 33.

Upon receiving the yarn defect detection signal from the yarn monitoring device 63, the unit control section 19 stops the driving of the air-jet spinning device 23 and/or the draft device 21 to cut the spun yarn 33. That is, the air-jet spinning device 23 functions as a cutting section that cuts the spun yarn 33 when the yarn monitoring device 63 detects a yarn defect. The spinning unit 7 may include a cutter for cutting the spun yarn 33.

The yarn interfering device 27 interferes with the spun yarn 33 that has passed through the yarn accumulating device 25. The yarn interfering device 27 is disposed downstream of the yarn accumulating device 25. In the present embodiment, the yarn interfering device 27 includes a waxing device 65 and a yarn running sensor (yarn detecting device) 67.

The waxing device 65 can hold the wax applied to the spun yarn 33. The waxing device 65 waxes the spinning yarn 33 that is traveling between the yarn accumulating device 25 and the winding device 31. A yarn running sensor 67 is provided near the waxing device 65.

The yarn running sensor 67 detects whether the spun yarn 33 is running, in other words, whether the spun yarn 33 is present or absent, at a predetermined position of the yarn path. In the present embodiment, the yarn running sensor 67 is disposed slightly below the waxing device 65 on the downstream side thereof. The yarn running sensor 67 is electrically connected to the unit control section 19.

The suction device 29 can suck the spun yarn 33 after passing through the yarn interfering device 27. The suction device 29 is disposed downstream of the yarn interfering device 27. The suction device 29 is configured to act on the spun yarn 69 on the winding device 31 side shown by the chain line in fig. 3 when the spun yarn 33 is cut off between the air-jet spinning device 23 and the winding device 31. A typical cause of the breakage of the spun yarn 33 is the cutting of the spun yarn 33 (interruption of the air-jet spinning) due to the detection of the yarn defect by the yarn monitoring device 63. The timing at which the suction device 29 acts on the spun yarn 69 is after the spun yarn 33 is broken and before the spun yarn 69 is wound around the rotating package 93 by the winding device 31.

Specifically, the suction device 29 sucks and catches the spun yarn 69 on the winding device 31 side below the yarn accumulating device 25 (yarn guide 59).

The suction device 29 includes a suction tube 71. A suction port 73 is formed at the tip (one end in the longitudinal direction) of the suction tube 71. The suction port 73 opens to a yarn passage, which is a path along which the spun yarn 33 travels from the yarn interfering device 27 toward the winding device 31. The suction port 73 is fixedly disposed in a direction along the yarn passage. That is, the suction port 73 is fixed so as not to move in the direction along the yarn passage. For adjustment, the suction port 73 may be moved in a direction along the yarn path. The suction tube 71 is connected to a blower functioning as a negative pressure source via a pipe or the like. This can generate a suction airflow at the suction port 73 (inside the suction tube 71).

As shown in fig. 3, the suction port 73 is formed long in the direction along the yarn passage between the yarn interfering device 27 and the winding device 31. In the present embodiment, the suction port 73 is formed in a rectangular shape whose longitudinal direction is the vertical direction, which is the direction in which the yarn path extends. In this way, the suction device 29 is configured to easily suck the spun yarn 69 on the winding device 31 side through the suction port 73.

The suction device 29 is disposed at a vertical yarn catching interval S1 with respect to the yarn accumulating device 25. The yarn catching interval S1 is an interval between the yarn accumulating device 25 and the suction device 29 in the vertical direction. Strictly speaking, the yarn catching interval S1 is defined as the interval in the vertical direction between the lower end of the yarn carrier 59 of the yarn accumulating device 25 and the upper end of the suction port 73 of the suction device 29. The yarn catching interval S1 has a predetermined interval in the vertical direction in order to secure the length of the spun yarn 69 on the winding device 31 side caught by the suction device 29.

The yarn interfering device 27 is provided in the space 75 between the yarn accumulating device 25 and the suction device 29 corresponding to the yarn catching space S1.

The yarn catching spacing S1 refers to the following distance: after the spun yarn 33 is broken, the end of the spun yarn 69 is substantially released from the restraint by the yarn accumulating device 25 and becomes free, and then the end is spaced from the opening of the suction device 29. As the distance becomes longer, the opportunity for the suction port 73 to apply a suction airflow to the spun yarn 69 substantially increases, and therefore the spun yarn 69 is more easily caught.

In the present embodiment, the yarn catching interval S1 has an interval of 50mm to 150mm in the vertical direction. By setting the yarn catching interval S1 to such a size, a space for installing the yarn interfering device 27 can be secured between the yarn accumulating device 25 and the suction device 29 while maintaining the compactness of the rotor spinning machine 1. Therefore, not only the spun yarn 69 can be reliably captured, but also the space can be effectively used.

In the present embodiment, the suction device 29 is disposed below the waxing device 65 of the yarn intervention device 27. Therefore, the residue of wax and the like can be sucked and removed by the suction device 29.

The suction device 29 is provided with a shutter (changing unit) 77 for changing the suction state of the suction device 29. The shutter 77 is disposed, for example, between the suction port 73 and a portion downstream of the suction port 73 in the air flow direction. The shutter 77 can be constituted by an opening and closing mechanism having a plate-like member, for example. The shutter 77 can be opened and closed by the control of the unit control unit 19 or the central control device 13.

For example, when the spun yarn 33 is not broken, the spun yarn 69 does not need to be sucked into the suction port 73 and caught. In this situation, by controlling the shutter 77 to be closed, energy saving of the rotor spinning machine 1 can be achieved.

The winding device 31 winds the spun yarn 33 after passing through the yarn interfering device 27 to form a package 93. The winding device 31 is disposed downstream of the air-jet spinning device 23 and below the air-jet spinning device 23. The winding device 31 is also disposed downstream and below the yarn intervention device 27 and the suction device 29.

In the present embodiment, the winding device 31 is a single-spindle-drive type winding device. That is, the winding device 31 of each spinning unit 7 is controlled to start and stop winding and the like independently of the winding devices 31 of the other spinning units 7. The winding device 31 includes a cradle arm 81, a winding drum 83, and a traverse guide 85.

The swing arm 81 is supported to be swingable about the support shaft 87, and rotatably supports the bobbin 91 (and hence the package 93) for winding the spun yarn 33. The winding drum 83 rotates while being in contact with the outer peripheral surface of the bobbin 91 or the package 93, thereby rotationally driving the package 93 in the winding direction. The winding device 31 drives the winding drum 83 by an electric motor, not shown, while reciprocating the traverse guide 85 by a driving mechanism, not shown. Thus, the winding device 31 winds the spun yarn 33 around the package 93 while traversing the spun yarn 33.

As shown in fig. 1, the rotor spinning machine 1 includes a rail 101. The rail 101 is arranged along the direction in which the plurality of spinning units 7 are arranged. The joint carriage 9 is configured to be able to travel on the rail 101. Thereby, the yarn splicing cart 9 can move relative to the plurality of spinning units 7.

The yarn splicing cart 9 moves to the spinning unit 7 where the yarn breakage or yarn cutting has occurred, and performs the yarn splicing operation on the spinning unit 7. The yarn splicing cart 9 performs yarn splicing operation in cooperation with a suction device 29 and the like provided in the spinning unit 7.

The yarn splicing cart 9 includes traveling wheels 103, a yarn splicing device 105, and a suction pipe (yarn catching and guiding device) 107. The joint carriage 9 further includes a carriage control unit 111 shown in fig. 4 and the like.

The suction pipe 107 can catch the spun yarn 33 generated by the air-jet spinning device 23. Specifically, the suction pipe 107 generates a suction airflow at its tip, thereby sucking and capturing the spun yarn 33 fed out from the air-jet spinning device 23. The suction pipe 107 is rotated in a state where the spun yarn 33 is caught, thereby guiding the spun yarn 33 to a position where the spun yarn can be introduced into the yarn splicing device 105.

After the spun yarn 33 is cut off, the yarn splicing device 105 splices the spun yarn on the air-jet spinning device 23 side guided by the suction pipe 107 and the spun yarn 69 on the winding device 31 side caught by the suction device 29. In the present embodiment, the splicer device 105 is a splicing device that splices yarn ends to each other by a whirling airflow. The splicing device 105 is not limited to the splicing device described above, and for example, a mechanical knotter or the like may be used.

The carriage control unit 111 is configured with a known computer having a CPU, ROM, RAM, and the like, which are not shown. The carriage control unit 111 controls the operations of the respective units included in the joint carriage 9, thereby controlling the joint work performed by the joint carriage 9.

Next, the operation of each part in the case where yarn splicing is performed by the splicing device 105 will be described by taking as an example the case where the yarn monitoring device 63 detects a yarn defect in the state of fig. 2.

First, the unit control section 19 stops the air-jet spinning device 23 and/or the draft device 21 based on the yarn defect detection signal input from the yarn monitoring device 63. At this time, the unit controller 19 also stops the winding device 31.

The spun yarn 33 is cut by stopping the air-jet spinning device 23 and/or the draft device 21. Thereby, the spun yarn 33 is broken. After the winding device 31 is completely stopped, the unit control section 19 drives the winding device 31 again. As a result, the spun yarn 69 on the winding device 31 side including the spun yarn remaining in the yarn accumulating device 25 is wound into the package 93 by the winding device 31. The winding speed at this time is lower than the normal winding speed so that the spun yarn 69 can be easily caught by the suction device 29.

The spun yarn 69 is drawn out by the yarn accumulating device 25 by driving the winding device 31, and the accumulated amount gradually decreases as shown in fig. 4. The yarn accumulating device 25 is provided with a sensor, not shown, for detecting an accumulated amount of the spun yarn 69. The unit control unit 19 monitors the detection signal of the sensor. When the timing slightly before the spun yarn 69 is separated from the yarn accumulating device 25 (for example, the timing when the sensor detects that the accumulated amount of the spun yarn 69 is equal to or less than a predetermined value), the unit control section 19 opens the closed shutter 77 to start the suction by the suction device 29. Thereafter, the unit control section 19 stops the winding device 31 again at substantially the same timing as when the end of the spun yarn 69 is separated from the yarn accumulating roller 53 and passes through the yarn guide 59. As a result, the spun yarn 69 can be captured by sucking the spun yarn through the suction port 73.

At an appropriate timing after the yarn monitoring device 63 detects the yarn defect, the unit control section 19 transmits a yarn splicing request signal to the carriage control section 111. The cart control unit 111 that has received the yarn splicing request signal stops the yarn splicing cart 9 after traveling to the target spinning unit 7.

At a predetermined timing after the spun yarn 33 is cut, the spun yarn 69 is caught by the suction device 29. The suction port 73 of the suction tube 71 is disposed in an appropriate positional relationship with respect to the yarn splicing device 105 in a state where the yarn splicing cart 9 is stopped at the working position of the spinning unit 7 provided with the suction device 29. Therefore, when the yarn splicing cart 9 arrives, the spun yarn 69 on the package 93 side held by the suction device 29 is guided to the yarn splicing device 105 provided in the yarn splicing cart 9.

After stopping the yarn splicing cart 9, the cart control unit 111 controls the yarn splicing cart 9 to move the suction pipe 107 to a position where the spun yarn on the air-jet spinning device 23 side can be caught as shown by a chain line in fig. 5. At substantially the same time, the unit control section 19 restarts driving the air-jet spinning device 23 and/or the draft device 21. The carriage control unit 111 causes the suction pipe 107 to guide the captured spun yarn on the air-jet spinning device 23 side to the lower yarn splicing device 105 as shown by a solid line in fig. 5.

In this state, the unit control section 19 operates the yarn splicing device 105 to splice the spun yarn 69 on the winding device 31 side and the spun yarn on the air-jet spinning device 23 side, which are sucked by the suction device 29. In this joint, the excess spun yarn is cut, sucked by the suction device 29 or the suction pipe 107, and discarded. The spun yarn is also continuously supplied from the air-jet spinning device 23 at the yarn splicing section, and the spun yarn is accumulated in the yarn accumulating device 25.

At substantially the same time as the completion of the splicing, the winding of the package 93 by the winding device 31 is restarted. The shutter 77 is closed at an appropriate timing after the completion of the joining work. In this way, the spinning unit 7 returns to the normal state of fig. 2.

When stopping the air-jet spinning device 23 and/or the draft device 21, the unit control section 19 may control the winding device 31 so as to decelerate the winding speed of the package 93 and cause the suction port 73 to suck the yarn end of the spun yarn 69 without completely stopping the winding device 31.

As described above, the yarn interfering device 27 is disposed in the yarn path of the spun yarn 33, but substantially only the yarn splicing device 105 is disposed between the suction device 29 and the winding device 31. In other words, when the yarn splicing is performed as shown in fig. 5, there is no extra device such as the yarn interfering device 27 below the suction device 29 and above the yarn splicing device 105. Therefore, since the movement of the spun yarn to be pieced is not affected by, for example, difficulty in restraining the spun yarn by the waxing device 65, the piecing by the piecing device 105 can be smoothly performed.

As described above, the rotor spinning machine 1 of the present embodiment includes the draft device 21, the rotor spinning device 23, the yarn accumulating device 25, the yarn interfering device 27, the suction device 29, and the winding device 31. The draft device 21 drafts the sliver 35. The air-jet spinning device 23 twists the sliver 35 drafted by the draft device 21, that is, the fiber bundle 37, by the whirling airflow, thereby generating the spun yarn 33. The yarn accumulating device 25 is disposed at a position lower than the air-jet spinning device 23, and temporarily accumulates the spun yarn 33 produced by the air-jet spinning device 23. The yarn intervention device 27 is disposed at a position lower than the yarn accumulating device 25, and intervenes on the spun yarn 33. The suction device 29 is disposed at a position lower than the yarn intervention device 27, and is configured to be capable of sucking the spun yarn 33. The winding device 31 is disposed at a position lower than the suction device 29, and winds the spun yarn 33 to form a package 93. The yarn intervention device 27 is a waxing device 65 and a yarn travel sensor 67.

Thus, when the spun yarn 33 is disconnected between the air-jet spinning device 23 and the winding device 31, the spun yarn 69 on the winding device 31 side can be reliably captured by the suction device 29. Further, since the yarn interfering device 27 is disposed in the space 75 between the yarn accumulating device 25 and the suction device 29, the space 75 does not become a dead space in the rotor spinning machine 1.

In the rotor spinning machine 1 of the present embodiment, the yarn accumulating device 25 includes the yarn accumulating roller 53 that accumulates the spun yarn 33 by winding the spun yarn 33 around the outer peripheral surface. The suction device 29 is disposed at a yarn catching interval S1 having a predetermined interval in the vertical direction with respect to the yarn accumulating device 25. The yarn catching interval S1 is the following interval: the spun yarn 69 unwound from the yarn accumulating roller 53 after the spun yarn 33 is cut off between the air-jet spinning device 23 and the winding device 31 passes through the yarn accumulating roller, and the length of the caught spun yarn 69 is secured. The yarn interfering device 27 is provided in the space 75 between the yarn accumulating device 25 and the suction device 29 corresponding to the yarn catching space S1.

This can sufficiently secure the distance between the yarn accumulating device 25 and the suction device 29. Therefore, the length of the suction device 29 for applying the suction flow for trapping to the spun yarn 69 can be substantially increased. As a result, the spun yarn 69 can be easily caught by the suction device 29. Further, by disposing the yarn interfering device 27 in a space corresponding to the distance secured for this purpose, the space can be effectively used.

In the rotor spinning machine 1 of the present embodiment, the distance between the yarn accumulating device 25 and the suction device 29 is 50mm to 150mm in the traveling direction (vertical direction) of the spun yarn 33.

This makes it possible to reliably catch the spun yarn 69 by the suction device 29 while maintaining the compactness of the configuration, and to ensure a space for disposing the yarn intervention device 27.

In the rotor spinning machine 1 of the present embodiment, the yarn intervention device 27 includes, as a yarn processing device, a waxing device 65 capable of holding wax applied to the spun yarn 33.

This enables the waxing device 65 to be laid out with high space efficiency. Since the waxing device 65 has a fixed length, the suction device 29 can be disposed separately from the yarn accumulating device 25, and the spun yarn 69 can be easily caught by the suction device 29.

In the rotor spinning machine 1 of the present embodiment, the yarn interfering device 27 includes, as a yarn detecting device, a yarn running sensor 67 for detecting the presence or absence of the spun yarn 33.

This enables the yarn travel sensor 67 to be laid out with high space efficiency. Since the yarn running sensor 67 is a device having a constant length, the suction device 29 can be disposed separately from the yarn accumulating device 25, and the yarn can be easily caught by the suction device 29.

In the rotor spinning machine 1 of the present embodiment, the suction device 29 includes a suction port 73 that opens to a yarn path through which the spun yarn 33 travels, between the yarn interfering device 27 and the winding device 31. The suction port 73 is formed long in the direction along the yarn passage.

This makes it easy to catch the spun yarn 69 on the winding device 31 side through the suction port 73.

The rotor spinning machine 1 according to the present embodiment includes a shutter 77 capable of changing the suction state of the suction device 29.

Thus, for example, at the time of normal winding in which the spun yarn 33 is not broken, the suction device 29 can be made not to act on the spun yarn 33. Thus, energy saving can be achieved in the rotor spinning machine 1.

In the rotor spinning machine 1 of the present embodiment, the rotor spinning machine 1 includes the joint device 105 and the suction pipe 107. When the spun yarn 33 is cut off between the air-jet spinning device 23 and the winding device 31, the yarn splicing device 105 splices the spun yarn on the air-jet spinning device 23 side and the spun yarn 69 on the winding device 31 side. The suction pipe 107 catches the spun yarn on the air spinning device 23 side and guides the spun yarn toward the yarn splicing device 105. In the case of performing the above-described splicing, the splicing device 105 is disposed between the suction device 29 and the winding device 31 in the vertical direction.

Thus, the spun yarn 69 on the winding device 31 side is not physically affected by the yarn intervening device 27 or the like (for example, contact of the waxing device 65 with the spun yarn 69) at the time of piecing. Thus, the joint can be smoothly performed.

The rotor spinning machine 1 of the present embodiment includes a plurality of draft devices 21. Each draft device 21 includes a plurality of drive rollers. All the drive rollers constituting the draft device 21 are driven independently of the drive rollers of the other draft devices 21.

This allows the driving of each part of the draft device 21 (the driving roller of each draft roller pair) to be controlled independently and flexibly from the other draft devices 21.

While the preferred embodiments of the present invention have been described above, the above configuration can be modified as follows, for example.

In the above embodiment, the yarn interfering device 27 includes the waxing device 65 and the yarn running sensor 67. Instead of this, for example, the yarn interfering device 27 may be provided with only the waxing device 65, or the yarn interfering device 27 may be provided with only the yarn running sensor 67.

The yarn intervention device 27 may include a yarn processing device other than the waxing device 65. As such a yarn processing device, for example, a tension adjusting device that adjusts the tension of the spun yarn 33 can be cited.

The yarn intervention device 27 can be provided with yarn detection devices of various configurations regardless of contact or non-contact.

In the above embodiment, the yarn splicing device 105 and the suction pipe 107 for yarn splicing are provided on one yarn splicing cart 9 shared by a plurality of spinning units 7. In other words, the yarn splicing device 105 and the suction pipe 107 move together with the yarn splicing cart 9 with respect to the plurality of spinning units 7, and perform an operation for yarn splicing. However, the piecing device 105 and the suction pipe 107 may be provided independently of each other in each spinning unit 7. In this configuration, the suction device 29, the piecing device 105, and the winding device 31 are not only arranged in order from above at all times at the time of piecing, but are also arranged in the vertical direction. In the configuration in which the yarn splicing device 105 and the suction pipe 107 are arranged in each spinning unit 7, when the spun yarn 33 is cut off in a certain spinning unit 7, the yarn splicing operation can be completed in the spinning unit and the spinning can be resumed. In this configuration, the joint carriage 9 can be omitted.

The shutter 77 may have any configuration and position as long as the generation/stop of the suction airflow can be switched. For example, the shutter 77 may be provided in the suction port 73.

In the above embodiment, the spun yarn 33 is pulled out from the air-jet spinning device 23 by the yarn accumulating device 25. The spinning unit 7 may be configured to pull out the spun yarn 33 from the air-jet spinning device 23 by a pair of delivery rollers instead of the yarn accumulating device 25. In this case, the yarn accumulating device 25 may be provided downstream of the delivery roller pair.

It is obvious that many modifications and variations of the present invention can be made by taking the above teachings into consideration. Therefore, it is to be understood that the present invention can be practiced by methods other than those described in the present specification within the scope of the appended claims.