CN109385703B

CN109385703B - Rotor spinning machine

Info

Publication number: CN109385703B
Application number: CN201810762667.3A
Authority: CN
Inventors: 中山昇
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2017-08-02
Filing date: 2018-07-12
Publication date: 2022-06-24
Anticipated expiration: 2038-07-12
Also published as: CN109385703A; EP3438333A1; JP2019026980A

Abstract

The invention provides an air spinning machine. The rotor spinning machine comprises: a drafting device (7), an air spinning device (9), a yarn storage device (22), a suction part (70), a winding device (26), a yarn splicing device (23), a first guide device (27) and a second guide device (28). The yarn storage device (22) draws out fine sand generated by the open-end spinning device (9). The suction section (70) forms a suction opening for a fiber travel path between the air spinning device (9) and the yarn accumulating device (22). The winding device (26) is disposed at a position higher than the upstream end of the fiber running path of the draft device (7) and forms a package. The yarn joining device (23) performs yarn joining. The first guide device (27) catches the yarn end from the open-end spinning device (9) and guides it to the yarn splicing device (23). The second guide device (28) catches the yarn end from the package (50) and guides the yarn end to the yarn joining device (23).

Description

Rotor spinning machine

Technical Field

The present invention relates to a rotor spinning machine provided with a suction unit for removing thread waste and fly waste from a rotor spinning device.

Background

Conventionally, a spinning machine having a structure for removing thread waste generated in an air-jet spinning device is known. Such spinning machines are disclosed in japanese patent laid-open nos. 2012 and 57274 (patent document 1) and 2013 and 253358 (patent document 2).

The spinning machine of patent document 1 includes: a spinning section, a yarn slack eliminating section, a winding device, and a yarn trap. The spinning section generates spun yarn. The yarn slack eliminating section has a buffer function of preventing a variation in the tension of the spun yarn on the winding device side from being transmitted to the spinning section side. The yarn trap is disposed above the yarn slack eliminating section, and generates a suction airflow from the suction port to suck and remove yarn waste generated when the spun yarn is cut.

The spinning machine of patent document 2 includes: spinning device, defect detection device and cutterbar. The defect detection device is disposed downstream of the spinning device and detects a defective portion of the spun yarn. When the defect detection device detects a defect, the spun yarn is cut by the cutter. Patent document 2 describes that a suction port, not shown, is formed for removing the cut spun yarn.

However, the layouts of the spinning machines of

patent documents

1 and 2 in which the winding device is disposed at a position lower than the upstream end of the draft device are limited to the methods for removing the thread waste, and the layouts in which the winding device is disposed at a position higher than the upstream end of the draft device are neither described nor suggested as to the structure for removing the thread waste.

Disclosure of Invention

A main object of the present invention is to provide a rotor spinning machine capable of appropriately removing thread waste, fly, and the like in a layout in which a winding device is disposed at a position higher than an upstream end of a draft device.

According to an aspect of the present invention, there is provided a rotor spinning machine of the following construction. That is, the rotor spinning machine includes: a draft device, an air spinning device, a yarn drawing device, a suction section, a winding device, a yarn splicing device, a first guide device, and a second guide device. The drafting device piles the fiber bundle for drafting. The air-jet spinning device performs normal spinning in which the fiber bundle over-drafted by the draft device is twisted by a whirling airflow to produce spun yarn. The yarn drawing device draws out the spun yarn generated by the air-jet spinning device. The suction unit forms a suction port in a fiber running path between the air-jet spinning device and the yarn drawing device. The winding device is disposed at a position higher than an upstream end of a fiber traveling path of the draft device, and winds the spun yarn drawn by the yarn drawing device to form a package. The yarn splicing device splices yarns. The first guide device captures a yarn end from the air-jet spinning device and guides the yarn end to the yarn splicing device. The second guide device captures the yarn end from the package and guides the yarn end to the yarn splicing device.

Thus, thread waste generated when the first guide device fails to catch the yarn end and fly or the like (hereinafter, referred to as fiber waste) generated in the air-jet spinning device during the yarn discharge spinning can be removed by the suction portion. Therefore, the occurrence of yarn defects due to the entanglement of the fiber flocks with the spun yarn can be prevented.

In the above rotor spinning machine, the following configuration is preferably adopted. The first guide device includes a hollow member having a catching portion and a rotation center, and the air-jet spinning device, the catching portion, and the suction port are arranged in this order along a fiber traveling path when the first guide device is located at a catching position at which a yarn end from the air-jet spinning device is caught. Thus, for example, the spun yarn can be sucked by the suction portion when the first guide device fails to catch the spun yarn.

In the above rotor spinning machine, the following configuration is preferably adopted. That is, the above pneumatic spinning device includes: a fiber guide, a nozzle block, and a hollow guide shaft body. The fiber guide guides the fiber bundle. The nozzle block is used for guiding the fiber bundle guided by the fiber guide, and is provided with a spinning chamber and a first nozzle for passing air for generating a whirling airflow in the spinning chamber. The hollow guide shaft is used for guiding the fiber bundle passing through the nozzle block, and is provided with a yarn passage and a second nozzle for allowing air injected at least during yarn discharging spinning to pass through. In the case of the yarn discharge spinning, the draft device is driven in the draft direction, and air is ejected from at least the second nozzle.

Even in the rotor spinning machine that performs the yarn discharge spinning by the nozzle structure described above, the lint can be effectively removed by the suction portion.

In the above rotor spinning machine, it is preferable that the suction unit sucks fiber waste generated when the rotor spinning device performs the yarn discharge spinning. This can prevent the lint from being entangled with the spun yarn.

In the above rotor spinning machine, it is preferable that the yarn end of the package is located downstream of the suction port in the fiber traveling direction when the winding of the package by the winding device is interrupted. Thereby, the yarn end of the package can be caught by the second guide device.

In the above rotor spinning machine, the following configuration is preferably adopted. That is, the suction unit includes an opening/closing unit provided in the suction port or a removal passage through which a suction airflow flows. The opening/closing unit is capable of switching between an open state in which the suction port or the removal passage is opened to generate a suction airflow at the suction port, and a closed state in which the suction port or the removal passage is closed to prevent the suction port from generating the suction airflow.

This can control the generation and stop of the suction airflow, and therefore can remove lint at a necessary time and reduce the amount of energy consumed.

In the above rotor spinning machine, it is preferable that the opening/closing portion is opened at least a certain time period after the stop of the normal spinning by the rotor spinning device and before the start of the discharge spinning.

This allows the suction portion to remove fiber flocks generated from the stop of the normal spinning to the start of the discharge spinning.

In the above rotor spinning machine, the following configuration is preferably adopted. That is, the air-jet spinning device is configured to be able to bring the nozzle block into contact with or separate from the hollow guide shaft body. After the spun yarn is in the cut-off state and at least a certain period before the start of the yarn-discharging spinning, a cleaning operation of ejecting air from the first nozzle is performed in a state where the nozzle block is separated from the hollow guide shaft body, and the opening/closing portion is opened at least a certain period during the cleaning operation.

This enables the suction section to remove lint generated during the cleaning operation of the air-jet spinning device.

In the above rotor spinning machine, it is preferable that the opening/closing unit is switched to the closed state after the end of the cleaning operation and before the start of the discharge spinning.

This prevents the suction airflow generated by the suction unit from affecting the discharge spinning, and thus the discharge spinning can be performed with high accuracy.

In the above rotor spinning machine, the opening/closing unit is preferably in a closed state at a start time of the discharge spinning.

This prevents the suction airflow generated by the suction unit from interfering with the capturing operation of the first guide device, and the first guide device can reliably perform the capturing operation.

In the above rotor spinning machine, the following configuration is preferably adopted. That is, the draft device performs draft under the start draft condition during the discharge spinning, and then performs draft under the normal draft condition. After the draft condition is changed from the draft start condition to the normal draft condition, the opening/closing section is switched from the open state to the closed state.

Thus, even when yarn breakage occurs when the draft condition is changed, the spun yarn in which yarn breakage occurs can be removed by the suction portion.

In the above rotor spinning machine, the following configuration is preferably provided. That is, the upstream end of the fiber traveling path of the draft device is disposed closer to the worker passage than the downstream end of the fiber traveling path of the air-jet spinning device. The yarn drawing device is disposed on the opposite side of the worker passage with the air-jet spinning device interposed therebetween.

Thus, even in a configuration in which the air-jet spinning device and the yarn drawing device are disposed at positions away from the worker passage, and the accumulation state of the lint is not easily visually recognized by the worker, the lint can be automatically removed by the suction portion.

In the above rotor spinning machine, the following configuration is preferably adopted. That is, the air-jet spinning machine includes a yarn monitoring device that is disposed between the air-jet spinning device and the yarn drawing device in a fiber traveling path and monitors the spun yarn. The suction port is disposed below a fiber running path between the yarn monitoring device and the yarn drawing device.

This prevents a monitoring failure caused by the yarn monitoring device detecting lint. Further, since the suction port is disposed below the fiber running path, the suction port can be disposed while preventing interference between the suction port and the fiber running path. Further, the spun yarn (thread waste) that has failed to be caught by the first guide device and falls downward by gravity is easily sucked by the suction portion.

In the above rotor spinning machine, the following configuration is preferably adopted. That is, the air-jet spinning machine includes a yarn monitoring device that is disposed between the yarn drawing device and the winding device in the fiber running path and monitors the spun yarn. The suction port is disposed below a fiber running path between the air spinning device and the yarn drawing device.

Accordingly, the suction portion removes the fiber waste, and the spun yarn is less likely to be wound with the yarn waste, so that the number of yarn defects detected by the yarn monitoring device can be reduced. As a result, the number of times of interruption of package formation for removing a yarn defect can be reduced, and the operation efficiency of the rotor spinning machine can be improved. Further, since the suction port is disposed below the fiber running path, the suction port can be disposed while preventing interference between the suction port and the fiber running path. Further, the spun yarn (thread waste) that has failed to be caught by the first guide device and falls downward by gravity is easily sucked by the suction portion.

In the above-described rotor spinning machine, it is preferable that the suction guide portion is formed to extend from the suction port to an upstream side in a suction airflow direction, an upper portion of the suction guide portion is open, a wall surface is formed in a portion other than the upper portion, and the suction guide portion has a shape in which an interval between the wall surfaces of the side surfaces is narrowed as approaching the suction port. This allows the lint to be guided to the suction port by the suction guide.

Drawings

Fig. 1 is a side view showing a structure of a spinning unit provided in a spinning frame according to an embodiment of the present invention.

Fig. 2 is a sectional view showing an internal structure of the air-jet spinning device.

Fig. 3 is an enlarged perspective view showing the shapes of the yarn storing device and the suction portion.

Fig. 4 is a timing chart showing the timing at which the opening/closing unit switches the opening and closing of the suction port.

Fig. 5 is a side view showing a state when the cleaning operation is performed.

Fig. 6 is a side view showing the state where the yarn is caught by the guide device.

Fig. 7 is a side view showing a state in which the guide device guides the spun yarn to the yarn splicing device.

Fig. 8 is a side view showing a state where the first guide device fails to catch the spun yarn and the spun yarn is sucked by the suction portion.

Fig. 9 is a side view showing a structure of a spinning unit according to a modification.

Detailed Description

Next, a spinning machine (air spinning machine) according to an embodiment of the present invention will be described with reference to the drawings. In the present specification, "upstream" and "downstream" mean upstream and downstream in the traveling direction of the fiber (specifically, the sliver 15, the fiber bundle 8, and the spun yarn 10). In the description of the positional relationship of the devices arranged along the fiber traveling path, the case where the devices are arranged between a and B on the fiber traveling path is often described as being arranged between a and B, and the like.

The spinning machine includes a plurality of spinning units 2 arranged in parallel and a not-shown machine station control device that collectively manages the spinning units 2. Each spinning unit 2 spins the fiber bundle 8 fed from the draft device 7 by the air-jet spinning device 9 to generate the spun yarn 10, and winds the spun yarn 10 by the winding device 26 to form the package 50. Further, a worker passage 4 through which workers pass is formed on the opposite side of the yarn accumulating device 22 (the end portion on the side close to the draft device 7, the right side in fig. 1) via the air-jet spinning device 9.

As shown in fig. 1, each spinning unit 2 includes a draft device 7, an air-jet spinning device 9, a yarn accumulating device 22, a yarn joining device 23, a yarn monitoring device 25, and a winding device 26, which are arranged in this order from upstream to downstream. Each unit included in the spinning unit 2 is controlled by a unit controller, not shown, provided in the spinning unit 2. However, each unit included in the spinning unit 2 may be controlled by the machine control device. Alternatively, a unit controller may be provided for each spinning unit 2 of a predetermined amount.

The draft device 7 drafts a sliver (fiber bundle) 15. Specifically, the draft device 7 forms the fiber bundle 8 by nipping and conveying the sliver 15 between a plurality of draft rollers (bottom rollers) and a plurality of counter rollers (top rollers) and thereby stretching (drafting) the sliver 15 to a predetermined fiber amount (or thickness). The draft device 7 includes four draft rollers, i.e., a rear roller 16, a third roller 17, a middle roller 19, and a front roller 20, in this order from the upstream side. Further, a rubber belt 18 is wound around the middle roller 19. Each draft roller is rotationally driven at a predetermined rotational speed. The draft device 7 has opposed rollers arranged to face the draft rollers.

In the present embodiment, the draft rollers provided in one spinning unit 2 are driven by independent drive sections, and the rotation speed of each draft roller can be individually changed. Thereby, the draft conditions (specifically, the draft ratio, the draft speed, and the like) can be changed. The draft device 7 makes draft conditions different from those in normal spinning, for example, in the case of spinning out yarn described later. Instead of providing a driving section for each draft roller of one spinning unit 2, at least two draft rollers provided in one spinning unit 2 may be driven by the same driving section. For example, the rear roller 16 and the third roller 17 may be driven by the same driving unit. In the present embodiment, the driving portion of each draft roller is provided for each spinning unit 2, but a common driving portion may be used for a plurality of spinning units 2.

An air-jet spinning device 9 is disposed at the closest position downstream of the front roller 20. The air-jet spinning device 9 twists the fiber bundle 8 supplied from the draft device 7 to generate a spun yarn 10. In the present embodiment, an air-type spinning device is used which twists the fiber bundle 8 with a whirling airflow. As shown in fig. 2, the air-jet spinning device 9 includes a nozzle block 30 and a hollow guide shaft body 34. The nozzle block 30 includes: a fibre guide 31, a spinning chamber 32 and a first nozzle 33. The hollow guide shaft 34 includes a yarn passage 35 and a second nozzle 36. The respective sections of the open-end spinning device 9 are controlled by a unit controller.

The fiber guide 31 is a member that guides the fiber bundle 8 drafted by the draft device 7 toward the inside of the air-jet spinning device 9. The fiber guide 31 is provided with a fiber introduction port 31a and a guide needle 31 b. The fiber bundle 8 drafted by the draft device 7 is introduced from the fiber introduction port 31a and is guided into the spinning chamber 32 through the guide needle 31 b. The air-jet spinning device 9 jets air from the first nozzle 33 into the spinning chamber 32, and applies a whirling airflow to the fiber bundle 8 in the spinning chamber 32. The guide needle 31b may be omitted, and the downstream end of the fiber guide 31 may function as the guide needle 31 b.

The hollow shaft guide 34 is a cylindrical member, and a yarn passage 35 is formed therein. The air-jet spinning device 9 injects air from the second nozzle 36 into the yarn passage 35, thereby generating a swirling air flow in the yarn passage 35. The whirling airflow generated in the yarn passage 35 is in the opposite direction to the whirling airflow generated in the spinning chamber 32.

The air-jet spinning device 9 configured as described above can perform the discharge spinning and the normal spinning. The yarn discharge spinning is a spinning operation performed by the air-jet spinning device 9 when the spun yarn 10 starts or is newly generated. The normal spinning is a spinning operation in which the spun yarn 10 wound by the winding device 26 is continuously generated after the yarn discharge spinning.

In the case of performing the yarn discharge spinning, first, air is not ejected from the first nozzle 33, but air is ejected from the second nozzle 36, and a swirling air flow is generated. The fiber bundle 8 drafted by the draft device 7 is guided by the fiber guide 31 into the air-jet spinning device 9. The fiber bundle 8 is conveyed to the hollow guide shaft body 34.

Since the yarn passage 35 is formed such that the downstream side cross-sectional area is larger than the upstream side cross-sectional area, the swirling air flows toward the downstream side in the yarn passage 35. This enables the fiber bundle 8 to be fed downstream of the yarn passage 35. The fiber bundle 8 is spun in a bundled fiber shape by the air ejected from the first nozzle 33 and the second nozzle 36, and is discharged from the hollow guide shaft body 34.

After the yarn discharge spinning, a normal spinning is performed. In the normal spinning, air is ejected from the first nozzle 33, not from the second nozzle 36. Therefore, the rear end of the fiber bundle 8 supplied from the draft device 7 is oscillated back and forth around the front end of the hollow guide shaft body 34 by the swirling airflow generated by the first nozzle 33 in the spinning chamber 32. Thus, the fiber bundle 8 is twisted to produce the spun yarn 10. The spun yarn 10 is fed from a downstream yarn outlet (not shown) to the outside of the air-jet spinning device 9 through a yarn passage 35 of the hollow spindle body 34.

As described above, the air-jet spinning device 9 can twist the fiber bundle 8 to generate the spun yarn 10 during the discharge spinning and the normal spinning.

A first guide 61 for guiding the spun yarn 10 is disposed downstream of the air-jet spinning device 9. The first guide 61 guides the spun yarn 10 to the yarn storage device 22. The first guide 61 is movable to guide the spun yarn 10 to the yarn accumulating device 22 when performing yarn splicing or the like. A sensor for detecting the tension of the spun yarn 10 may be disposed between the air-jet spinning device 9 and the yarn accumulating device 22. The sensor for detecting the tension may be omitted.

Downstream of the first guide 61, a yarn storage 22 is provided. The yarn storage device 22 is supported by the frame 6. The yarn accumulating device 22 draws the spun yarn 10 from the air-jet spinning device 9. The yarn accumulating device 22 includes a yarn accumulating roller 41, an electric motor 42 for driving and rotating the yarn accumulating roller 41, and a yarn guide member 43. The spun yarn 10 is wound around the outer peripheral surface of the yarn accumulating roller 41, and the spun yarn 10 is temporarily accumulated.

A thread guide member 43 is attached to the downstream end of the thread storage roller 41. The yarn guide member 43 is supported to be rotatable relative to the yarn storage roller 41. A permanent magnet is attached to one of the guide hook member 43 and the yarn accumulating roller 41, and a magnetic hysteresis material is attached to the other. By these magnetic means, a torque is generated against the relative rotation of the thread guide member 43 with respect to the yarn storage roller 41. Therefore, only when a force exceeding the torque is applied to the yarn hooking member 43 (when a yarn tension equal to or greater than a predetermined value is applied), the yarn hooking member 43 rotates relative to the yarn accumulating roller 41, and the spun yarn 10 wound around the yarn accumulating roller 41 can be unwound. When a force exceeding the torque is not applied to the yarn hooking member 43, the yarn accumulating roller 41 and the yarn hooking member 43 rotate integrally, and the spun yarn 10 is accumulated in the yarn accumulating roller 41.

In this way, the yarn accumulating device 22 operates to unwind the spun yarn 10 when the yarn tension on the downstream side increases, and to stop unwinding of the spun yarn 10 when the yarn tension decreases (the spun yarn 10 tries to relax). Thus, the yarn accumulating device 22 can eliminate the slack of the spun yarn 10 and apply an appropriate tension to the spun yarn 10. Further, the hook-guide member 43 operates to absorb the variation in the tension applied to the spun yarn 10 in the section between the yarn accumulating device 22 and the winding device 26 as described above, and thereby the variation in the tension can be prevented from affecting the spun yarn 10 in the section from the air-jet spinning device 9 to the yarn accumulating device 22.

A yarn amount detection sensor 44 and a suction unit 70 are disposed near the yarn accumulating device 22. The yarn amount detection sensor 44 is an optical sensor and detects the amount of the spun yarn 10 accumulated in the yarn accumulator 22.

The suction part 70 is supported by the frame 6 in the same manner as the yarn storage device 22. As shown in fig. 3, a suction port 71 is formed in the suction portion 70. The suction portion 70 is fixed to the frame 6. The position of the suction port 71 is also fixed. The suction port 71 is connected to a blower, not shown, so that a suction airflow can be generated from the suction port 71. This allows the lint (specifically, the lint of the spun yarn 10 whose yarn end has failed to be caught by the first guide device 27, fly coming out of the air-jet spinning device 9 during the yarn discharge spinning, and the like) present around the suction port 71 to be sucked. The lint sucked from the suction port 71 is removed through the removal passage 74. The removal passage 74 is connected to the blower via a main pipe arranged along the direction in which the spinning units 2 are arranged. Each of the removal passages 74 may be connected to the main pipe via a sub-pipe provided for each predetermined number of removal passages 74. A secondary blower may also be provided for the secondary duct. The removed fiber chips are collected in a collecting unit provided downstream of the main pipe.

The removal passage 74 is provided with an opening/closing unit 73. The opening/closing section 73 has a shutter structure and is capable of switching between an open state in which the removal passage 74 is opened and the suction port 71 generates a suction airflow and a closed state in which the removal passage 74 is closed and the suction port 71 does not generate a suction airflow. Specifically, the opening/closing unit 73 switches between the open state and the closed state by moving the shutter structure by a driving unit such as an electric motor or an air cylinder. The opening/closing section 73 is not provided in the suction port 71, but is provided in the removal passage 74 on the downstream side thereof. Therefore, when the open/close section 73 is switched from the open state to the closed state, the lint existing in the vicinity of the suction port 71 can be prevented from being pinched between the open/close section 73 and the removal passage 74. The switching timing of the open/close state of the opening/closing unit 73 will be described in detail later.

The fiber waste mainly removed by the suction unit 70 is thread waste, fly waste, or the like sent out from the air-jet spinning device 9. More specifically, the spun yarn 10 fed out from the air-jet spinning device 9 is caught by a first guide device 27, which will be described later, and guided to the yarn joining device 23, and is joined to the spun yarn 10 of the package 50 by the yarn joining device 23, but when the first guide device 27 fails to catch the spun yarn 10, the spun yarn 10 turns into a thread waste. In addition, there is a fly occurring in the air-jet spinning device 9 during spinning, and the fly may be discharged from a downstream end (outlet) of the air-jet spinning device 9. The suction unit 70 also removes lint (for example, fly falling from above, lint thrown into the suction port 71 by a worker, etc.) other than the above.

A suction guide portion 72 for guiding the lint to the suction port 71 is provided around the suction port 71. The suction guide portion 72 is a portion formed to extend from the suction port 71 toward the upstream side (the pneumatic spinning device 9 side) in the suction airflow direction. The suction guide 72 is open at the top and has a wall surface formed at a portion other than the top. The suction guide portion 72 has a shape in which the wall surface interval is narrowed (the cross-sectional area of the space is reduced) as the suction port 71 approaches (as the downstream of the suction airflow approaches).

As shown in fig. 1, the suction port 71 is located below the downstream end (outlet) of the air-jet spinning device 9. In other words, the suction port 71 is located below the fiber running path (yarn path) between the air-jet spinning device 9 and the yarn accumulating device 22. Therefore, the lint is directed toward the suction port 71 from above (more precisely, obliquely above). Since the suction guide portion 72 has a shape in which the upper portion is open, lint falling from an obliquely upper direction can be appropriately guided to the suction port 71.

The suction port 71 is provided so that the axial direction thereof is along the fiber running path. Specifically, the axial direction of the suction port 71 is substantially parallel to the fiber travel path. In other words, the axial direction of the suction port 71 is not perpendicular to the fiber running path, but rather nearly parallel to the fiber running path. The suction port 71 is configured to suck the spun yarn 10 from the longitudinal direction without sucking the spun yarn 10 from the radial direction. The suction port 71 is configured to suck the lint which falls down by being abutted against the suction guide portion 72 and the frame 6.

The fiber running path on the upstream side of the yarn accumulating device 22 (more specifically, on the upstream side of the first guide 61) is substantially horizontal to the installation surface of the spinning machine. The fiber running path on the downstream side of the yarn accumulating device 22 (specifically, on the downstream side of the second guide 62) is formed so as to face obliquely upward. Therefore, the fiber running path in winding the spun yarn 10 is largely (90 ° or more) bent by the yarn accumulating device 22.

The suction portion 70 is disposed between the air-jet spinning device 9 and the yarn accumulating device 22, and is further disposed closer to the yarn accumulating device 22 than the center position between the air-jet spinning device 9 and the yarn accumulating device 22. In other words, the suction portion 70 is provided in the vicinity of a position where the fiber running path is largely bent.

In this layout, among the draft device 7, the air-jet spinning device 9, the yarn accumulating device 22, the yarn monitoring device 25, and the winding device 26, the device disposed farthest from the worker tunnel 4 in a plan view is the yarn accumulating device 22. Therefore, the vicinity of the yarn accumulating device 22 is not easily visually recognized by the worker, and hence the accumulation state of the lint is not easily recognized. In the present embodiment, since the suction portion 70 is provided in the vicinity of the yarn accumulating device 22, lint that is not easily visually recognized by the worker can be automatically removed.

Above the suction unit 70, there are both a fiber running path in a substantially horizontal direction from the draft device 7 toward the yarn storage device 22 and a fiber running path in an oblique direction from the yarn storage device 22 toward the winding device 26. Therefore, the amount of lint falling from above is likely to increase. By providing the suction portion 70 at this position, not only the lint coming out of the air-jet spinning device 9 but also the lint generated in other parts can be removed.

A second guide 62 for regulating the operation of the spun yarn 10 unwound from the yarn accumulating roller 41 is provided downstream of the yarn accumulating roller 41. A yarn splicing device 23 is provided downstream of the second guide 62. When the spun yarn 10 between the air-jet spinning device 9 and the package 50 is in a broken state for some reason, the yarn joining device 23 joins the spun yarn 10 (first yarn) from the air-jet spinning device 9 and the spun yarn 10 (second yarn) from the package 50. In the present embodiment, the yarn splicing device 23 is a twisting device that twists yarn ends with each other by utilizing a swirling air flow generated by compressed air. The yarn splicing device 23 is not limited to the above splicing device, and for example, a mechanical knotter or the like can be used. The yarn splicing device 23 is configured independently of the air-jet spinning device 9. Therefore, the yarn joining device 23 is different from a structure in which the upstream fiber bundle and the downstream yarn end are guided to the spinning device and the yarn joining is performed in the spinning device.

The spinning unit 2 includes a guide device that guides the spun yarn 10 to the yarn joining device 23. The guide device is composed of a first guide device 27 that guides the first yarn to the yarn joining device 23 and a second guide device 28 that guides the second yarn to the yarn joining device 23.

The root portion of the first guide 27 is rotatably supported, and the first guide 27 is rotatable in the vertical direction about the root portion as a rotation center. The first guide device 27 is formed in a hollow shape, is connected to a blower not shown, and can generate a suction air flow. The first guide device 27 is rotated downward, and thereby the yarn end of the first yarn can be caught (the catching position shown in fig. 6). The first guide device 27 can guide the first yarn to the yarn joining device 23 by rotating upward after catching the first yarn. The first guide means 27 may or may not have a twisting function.

The root portion of the second guide 28 is rotatably supported, and the second guide 28 is rotatable in the vertical direction about the root portion as a rotation center. The second guide device 28 is also hollow and connected to a blower not shown, and can generate a suction air flow. The second guide device 28 is rotated upward, and thereby can catch the yarn end of the second yarn (see the chain line in fig. 1). The second guide device 28 can guide the second yarn to the yarn joining device 23 by rotating downward after catching the second yarn.

In a state where the first yarn and the second yarn are guided to the yarn joining device 23, the yarn joining device 23 is driven to join the first yarn (the spun yarn 10 produced by normal spinning) and the second yarn, and the spun yarn 10 is made continuous between the air-jet spinning device 9 and the package 50. This enables the spun yarn 10 to be wound into the package 50 again.

A yarn monitoring device 25 is provided downstream of the yarn splicing device 23. The yarn monitoring device 25 monitors the thickness of the running spun yarn 10 by a light-transmitting sensor, not shown. When detecting a yarn defect of the spun yarn 10 (at a position where an abnormality occurs in the thickness of the spun yarn 10 or the like), the yarn monitoring device 25 transmits a yarn defect detection signal to the unit controller. Upon receiving the yarn defect detection signal, the unit controller drives a cutter 24 (yarn cutting device) disposed in the vicinity of the yarn monitoring device 25 to cut the spun yarn 10. The yarn monitoring device 25 is not limited to a light-transmitting sensor, and may monitor the thickness of the spun yarn 10 by a capacitive sensor, for example. As the yarn defect, a foreign substance contained in the spun yarn 10 may be monitored. The yarn monitoring device 25 may monitor whether or not yarn breakage occurs. The cutter 24 may be provided in the yarn monitoring device 25. The spun yarn 10 may be cut by stopping the spinning by the air-jet spinning device 9 without the cutter 24. When the spinning is interrupted by a yarn breakage, a yarn cut, or the like, the spinning in the air-jet spinning device 9 is stopped, and then the rotation of the yarn accumulating roller 41 is decelerated and stopped. The draft in the draft device 7 is also stopped.

A winding device 26 is arranged downstream of the yarn storage device 22. The winding device 26 is provided at a position higher than the upstream end of the draft device 7. The winding device 26 includes a swing arm 52 and a winding drum 53. The fiber traveling path from the yarn storage device 22 toward the winding device 26 is curvedly guided by the downstream guide 63.

The swing arm 52 rotatably supports the winding pipe 51 for winding the spun yarn 10. The rocker arm 52 can rotate with its root portion as a rotation center. Thus, even if the spun yarn 10 is wound around the winding tube 51 and the diameter of the package 50 is increased, the winding of the spun yarn 10 can be appropriately continued.

The winding drum 53 is rotated in contact with the outer peripheral surface of the winding tube 51 or the package 50 by transmitting a driving force of a winding drum driving motor, not shown. A traverse groove, not shown, is formed in the outer peripheral surface of the winding drum 53, and the spun yarn 10 can be traversed by the traverse groove with a predetermined width. Thus, the winding device 26 can form the package 50 by winding the spun yarn 10 around the winding pipe 51 while traversing the spun yarn 10.

Instead of the winding drum 53, the winding device 26 may include a contact roller having no traverse groove formed therein and a traverse device provided independently of the contact roller. Examples of the traverse device include an arm type traverse device, a belt type traverse device, a turner type traverse device, and the like. In this case, the contact roller may be driven to rotate by rotating the take-up tube 51 by the take-up reel drive motor.

Next, the flow of yarn joining will be described together with the timing of switching the open/close state of the opening/closing section 73. The same processing is also performed when the spinning is started to start winding the spun yarn 10 in the new winding bobbin 51 without performing the yarn splicing. The processing described below is performed by the unit controller, but at least a part of the processing may be performed by another device (for example, a machine control device).

Fig. 4 shows whether air is ejected from the first nozzle 33 (ON or OFF), whether air is ejected from the second nozzle 36 (ON or OFF), whether the draft condition is a normal draft condition or a draft start condition (draft condition at the time of yarn discharge spinning), and whether the opening/closing section 73 is in an open state or a closed state. The horizontal axis of fig. 4 represents time. Fig. 4 shows a flow of processing performed until the winding operation is resumed, in which the spun yarn 10 is in the cut-off state, the spinning and the like are stopped, and the cleaning operation and the yarn joining are performed during the winding operation.

In the winding operation, in order to perform normal spinning, air is ejected from the first nozzle 33, but air is not ejected from the second nozzle 36, as described above. For the purpose of ordinary spinning, drawing is performed under ordinary drawing conditions. Since the suction unit 70 is less likely to remove the main object in the vicinity of the suction port 71, the opening/closing unit 73 is closed. In the present embodiment, in order to save energy consumed for generating the suction air flow, the open/close portion 73 may be closed during the winding operation, and the open/close portion 73 may be opened during the winding operation, thereby removing lint.

When the spun yarn 10 becomes a broken state during winding of the package 50 (specifically, when a yarn break occurs, when the spun yarn 10 is cut by the cutter 24, or when the spun yarn 10 is cut by stopping the spinning by the air-jet spinning device 9), the winding device 26 stops the winding of the package 50, the draft device 7 stops the draft of the fiber bundle 8, and the air-jet spinning device 9 stops the spinning. The first guide 61 is moved to a position away from the yarn storage 22.

Thereafter, as shown in fig. 5, the nozzle block 30 of the air-jet spinning device 9 is separated from the hollow guide shaft body 34, and then air is ejected from the first nozzle 33, thereby performing a cleaning operation of the air-jet spinning device 9. By performing the cleaning operation, the fly waste may be discharged from the air-jet spinning device 9. To remove the fly ash, the opening/closing unit 73 is switched from the closed state to the open state. In the present embodiment, the open-close section 73 is switched from the closed state to the open state simultaneously with the detection of the yarn breakage and/or the cutting of the spun yarn 10, but the open-close section 73 may be switched to the open state at the start of the cleaning operation. Even when the cleaning operation is not performed, the open/close section 73 is opened at least a certain time after the spinning is stopped and before the start of the spun yarn, and therefore, the fly or the like occurring at that time can be removed.

After the cleaning operation is completed (the air injection from the first nozzle 33 is stopped), the nozzle block 30 of the air-jet spinning device 9 is brought close to the hollow guide shaft body 34 and returned to the original position. And then, starting yarn-out spinning. Along with this, the air starts to be ejected from the second nozzle 36. Further, the draft device 7 restarts the draft under the draft start condition. In order to prevent the suction airflow generated by the suction unit 70 from affecting the yarn discharge spinning, the open/close unit 73 is switched from the open state to the closed state before the yarn discharge spinning is started.

The second guide 28 is turned upward before or after the start of the discharge spinning, thereby catching the second yarn as shown in fig. 6. Thereafter, the second guide device 28 rotates downward while holding the second yarn, thereby guiding the second yarn to a position where the yarn joining device 23 can join the second yarn. The second guide device 28 may catch the second yarn directly from the package 50, or another device may be provided between the package 50 and the second guide device 28.

Before the start of the yarn discharge spinning, the first guide device 27 is rotated downward, thereby moving to a position (catching position) where the first yarn can be caught. Then, the open-end spinning device 9 produces the first yarn by the yarn discharge spinning, whereby the first yarn is attracted and caught by the first guide device 27 as shown in fig. 6. When the first guide device 27 catches the first yarn, there are also cases where: even when the first guide device 27 cannot catch the yarn end of the first yarn fed from the air-jet spinning device 9, the first guide device 27 catches the middle portion of the first yarn thereafter, and as a result, the yarn end of the first yarn is caught by the first guide device 27.

If the opening/closing unit 73 is always in the open state, there is a possibility that: when the first guide device 27 cannot catch the yarn end of the first yarn, the yarn end is sucked by the suction portion 70, and the first guide device 27 cannot catch the first yarn even when it sucks the middle portion of the first yarn. In other words, the opening/closing portion 73 is always opened, thereby resulting in a decrease in the probability of the first guide device 27 successfully catching the first yarn. In the present embodiment, the open/close section 73 is closed at the start of the yarn discharge spinning, and after a certain time has elapsed (for example, before the first guide device 27 is rotated upward), the open/close section 73 is switched to the open state. This can prevent the first guide device 27 from successfully catching the first yarn. The start timing of the yarn discharge spinning is, for example, a timing when the air injection from the second nozzle 36 is started or a timing when the rear roller 16 starts to be driven in the draft direction.

After that, after the air is injected from the first nozzle 33, the first guide device 27 rotates upward while keeping the first yarn sucked, thereby guiding the first yarn to a position where the yarn joining device 23 can join the yarns. Thereby, as shown in fig. 7, the first yarn and the second yarn are guided to the yarn joining device 23. When the first guide device 27 fails to catch the first yarn, the drafting by the draft device 7 and the spinning by the air-jet spinning device 9 are stopped, and the first yarn fed out by the air-jet spinning device 9 is sucked and removed by the suction section 70 as shown in fig. 8.

After the first yarn and the second yarn are guided to the yarn joining device 23, the first guide 61 moves so as to approach the yarn accumulating device 22, and the first guide 61 guides the spun yarn 10 to the vicinity of the yarn accumulating device 22 while catching the spun yarn 10. After that, normal spinning is started. Specifically, after the yarn end is guided by the first and

second guide devices

27 and 28 again, normal spinning is started. That is, the air injection from the second nozzle 36 is stopped, and the draft condition is changed from the start draft condition to the normal draft condition. When the draft condition is changed, there is a possibility that yarn breakage occurs, and the opening/closing portion 73 is opened at the time of changing the draft condition in order to easily attract the spun yarn 10 when the yarn breakage occurs. After the draft condition is changed, the opening/closing section 73 is switched from the open state to the closed state. After that, the yarn joining operation by the yarn joining device 23 is ended, and the winding operation is performed again.

Next, a modified example of the above embodiment will be explained. In the description of the present modification, the same or similar components as those of the above-described embodiment may be denoted by the same reference numerals in the drawings, and the description thereof may be omitted.

In the present modification, the arrangement of the cutter 24 and the yarn monitoring device 25 is different from that of the above embodiment. Specifically, in the spinning unit 2 of the above embodiment, the cutter 24 and the yarn monitoring device 25 are disposed at positions between the yarn accumulating device 22 and the winding device 26 (specifically, between the yarn joining device 23 and the winding device 26). In contrast, in the spinning unit 2 of the present modification, the cutter 24 and the yarn monitoring device 25 are disposed between the air-jet spinning device 9 and the yarn accumulating device 22.

In this modification, the cutter 24 may be omitted, and the spun yarn 10 may be cut by stopping the spinning by the air-jet spinning device 9.

In the present modification, the suction port 71 is provided for the fiber running path between the yarn monitoring device 25 and the yarn accumulating device 22.

In the present modification, there is a possibility that the fiber waste of the air-jet spinning device 9 enters the monitoring space of the yarn monitoring device 25. In this case, a defect or the like of the spun yarn 10 cannot be accurately detected. However, since the suction portion 70 is provided, the yarn monitoring device 25 can appropriately monitor the spun yarn 10.

The yarn monitoring device may be disposed at both the position shown in the above embodiment and the position shown in the present modification. In this case, the yarn defect of the spun yarn 10 may be detected by a yarn monitoring device (first yarn monitoring device) disposed between the air-jet spinning device 9 and the yarn accumulating device 22, and the quality of yarn splicing by the yarn splicing device may be checked by a yarn monitoring device (second yarn monitoring device) disposed between the yarn splicing device 23 and the winding device 26.

As described above, the air-jet spinning machine according to the present embodiment includes: the draft device 7, the air-jet spinning device 9, the yarn accumulating device 22, the suction portion 70, the winding device 26, the yarn joining device 23, the first guide device 27, and the second guide device 28. The draft device 7 drafts a sliver (fiber bundle) 15 to form a fiber bundle 8. The air-jet spinning device 9 performs a normal spinning in which the fiber bundle 8 drafted by the draft device 7 is twisted by a whirling airflow to produce a spun yarn 10. The yarn accumulating device 22 draws out the spun yarn 10 generated by the air-jet spinning device 9. The suction section 70 forms a suction port 71 in a fiber running path between the air-jet spinning device 9 and the yarn accumulating device 22. The winding device 26 is disposed at a position higher than the upstream end of the fiber traveling path of the draft device 7, and winds the spun yarn 10 drawn out by the yarn accumulating device 22 to form a package 50. The yarn joining device 23 performs yarn joining. The first guide device 27 catches the end of the yarn from the air spinning device 9 and guides it to the yarn splicing device 23. The second guide device 28 captures the yarn end from the package 50 and guides it to the yarn splicing device 23.

This allows the suction unit 70 to remove lint present around the suction port 71. Therefore, the yarn defect caused by the fiber flocks being entangled with the spun yarn 10 can be prevented. As a result, the quality of the package 50 is improved. Further, since the yarn joining due to the yarn defect does not occur, the operation efficiency of the spinning unit 2 is not lowered.

The first guide device 27 includes a hollow member having a catching portion and a rotation center, and when the first guide device 27 is located at a catching position at the time of catching the yarn end from the air-jet spinning device 9, the catching portion, and the suction port 71 are arranged in this order along the fiber traveling path. The catching part is arranged at the front end of the hollow component. The rotation center is provided on the opposite side of the capturing section, and is a center of rotation of the hollow member when the position of the capturing section is moved to the capturing position and the standby position. Thus, for example, when the first guide device 27 fails to catch the spun yarn 10, the spun yarn 10 can be sucked by the suction portion 70.

In the rotor spinning machine of the present embodiment, the rotor spinning device 9 includes a fiber guide 31, a nozzle block 30, and a hollow guide shaft body 34. The fiber guide 31 guides the fiber bundle 8. The nozzle block 30 is introduced with the fiber bundle 8 guided by the fiber guide 31, and is formed with a spinning chamber 32 and a first nozzle 33 through which air for generating a whirling airflow in the spinning chamber 32 passes. The hollow guide shaft 34 is for introducing the fiber bundle 8 passing through the nozzle block 30, and is formed with a yarn passage 35 and a second nozzle 36 through which air ejected at least at the time of yarn discharge spinning passes. In the case of the yarn discharge spinning, the draft device 7 is driven in the draft direction, and the fiber bundle 8 drafted by the draft device 7 is introduced into the air-jet spinning device 9 from the fiber guide 31 by ejecting air from at least the second nozzle 36.

Even in the rotor spinning machine that performs the yarn discharge spinning by the nozzle structure described above, the lint can be effectively removed by the suction portion 70.

When the winding of the package 50 by the winding device 26 is interrupted, the yarn end of the package 50 is positioned downstream of the suction port 71 in the fiber traveling direction. This allows the yarn end of the package 50 to be caught by the second guide device 28.

In the rotor spinning machine of the present embodiment, the suction unit 70 includes an opening/closing unit 73 provided in the suction port 71 or the removal passage 74 through which the suction airflow flows. The opening/closing unit 73 can be switched between an open state in which the suction port 71 or the removal passage 74 is opened and the suction airflow is generated in the suction port 71, and a closed state in which the suction port 71 or the removal passage 74 is closed and the suction airflow is not generated in the suction port 71.

This makes it possible to control the generation and stop of the suction airflow, thereby removing lint at a necessary time and reducing the amount of energy consumed.

In the rotor spinning machine of the present embodiment, the opening/closing section 73 is opened at least some time after the normal spinning by the rotor spinning device 9 is stopped and before the start of the discharge spinning.

In this way, the fiber dust generated from the stop of the normal spinning to the start of the discharge spinning can be removed by the suction unit 70.

In the rotor spinning machine of the present embodiment, the rotor spinning device 9 is configured to be able to bring the nozzle block 30 into contact with or separate from the hollow guide shaft body 34. After the spun yarn 10 is in the cut-off state, at least some time before the start of the yarn discharge spinning, a cleaning operation of ejecting air from the first nozzle 33 is performed in a state where the nozzle block 30 is separated from the hollow guide shaft body 34, and the open/close portion 73 is opened at least some time during the cleaning operation.

This allows the suction unit 70 to remove lint generated during the cleaning operation of the air-jet spinning device 9.

In the rotor spinning machine according to the present embodiment, the opening/closing section 73 is closed after the cleaning operation is completed and before the start of the yarn discharge spinning.

This prevents the suction airflow generated by the suction unit 70 from affecting the discharge spinning, and the discharge spinning can be performed with high accuracy.

In the rotor spinning machine according to the present embodiment, the open/close section 73 is closed at the start time of the yarn discharge spinning.

This prevents the suction airflow generated by the suction unit 70 from interfering with the capturing operation of the first guide device 27, and the first guide device can reliably perform the capturing operation.

In the rotor spinning machine of the present embodiment, the draft device 7 performs draft under the draft start condition at the time of the yarn discharge spinning, and then performs draft under the normal draft condition. After the draft condition is changed from the draft start condition to the normal draft condition, the opening/closing section 73 is switched from the open state to the closed state.

Thus, even when yarn breakage occurs when the draft condition is changed, the spun yarn 10 in which yarn breakage occurs can be removed by the suction portion 70.

In the rotor spinning machine of the present embodiment, the upstream end of the fiber running path of the draft device 7 is disposed on the worker tunnel 4 side of the downstream end of the fiber running path of the rotor spinning device 9. The yarn accumulating device 22 is disposed on the opposite side of the worker passage 4 with the rotor spinning device 9 interposed therebetween.

Thus, even in a configuration in which the air-jet spinning device 9 and the yarn accumulating device 22 are disposed at positions distant from the worker passage 4, and the accumulation state of the lint is not easily visually recognized by the worker, the lint can be automatically removed by the suction portion 70.

The air-jet spinning machine of the present embodiment includes a yarn monitoring device 25 that is disposed between the air-jet spinning device 9 and the yarn accumulating device 22 in the fiber traveling path and monitors the spun yarn 10. The suction port 71 is disposed below the fiber travel path between the yarn monitoring device 25 and the yarn accumulating device 22.

This can prevent a monitoring failure caused by the yarn monitoring device 25 detecting the lint. Since the suction port 71 is disposed below the fiber running path, the suction port 71 can be disposed while preventing interference between the suction port and the fiber running path. The spun yarn 10 (thread waste) that has failed to be caught and falls downward by gravity is easily sucked by the suction portion 70 by the first guide device 27.

The rotor spinning machine according to the modification includes a yarn monitoring device 25 that is disposed between the yarn accumulating device 22 and the winding device 26 in the fiber traveling path and monitors the spun yarn 10.

Accordingly, since the suction portion 70 removes the fiber waste, the spun yarn 10 is less likely to be wound with the yarn waste or the like, and thus the number of yarn defects detected by the yarn monitoring device 25 can be reduced. Since the suction port 71 is disposed below the fiber running path, the suction port 71 can be disposed while preventing interference between the suction port and the fiber running path. The spun yarn 10 (thread waste) that has failed to be caught and falls downward by gravity is easily sucked by the suction portion 70 by the first guide device 27.

In the rotor spinning machine, it is preferable that the suction guide portion 72 is formed to extend from the suction port 71 to the upstream side in the suction airflow direction, an upper portion of the suction guide portion 72 is open, a wall surface is formed in a portion other than the upper portion, and the suction guide portion 72 is formed in a shape in which an interval between the side wall surfaces is narrowed as approaching the suction port 71. This allows the lint to be guided to the suction port 71 by the suction guide portion 72.

While the preferred embodiments and modifications of the present invention have been described above, the above-described configuration can be modified as follows, for example. In any of the following modifications, the suction port 71 is disposed between the air-jet spinning device 9 and the yarn drawing device. The following modifications can be combined appropriately.

In the above embodiment, the suction port 71 is disposed closer to the yarn accumulating device 22 than the air-jet spinning device 9, but may be disposed closer to the air-jet spinning device 9. The suction port 71 may be disposed at two positions, i.e., a position closer to the yarn accumulating device 22 than the air-jet spinning device 9 and a position closer to the air-jet spinning device 9. The suction portion 70 is not limited to the structure supported by the frame 6 as in the yarn accumulating device 22, and may be supported by another member.

In the above embodiment, the opening/closing portion 73 is provided in the removal passage 74, but may be provided in the suction port 71.

In the above embodiment, the opening/closing portion 73 switches between a state in which the suction airflow is generated at the suction port 71 and a state in which the suction airflow is not generated at the suction port 71. However, the suction unit 70 may be movable relative to the suction position shown in fig. 1, and the suction state of the suction unit 70 may be switched by moving the suction unit 70 to a position where the lint can be sucked and a position where the lint cannot be sucked (a position that is retracted from the fiber travel path compared to the position shown in fig. 1).

In the above embodiment, the spun yarn 10 generated by the air-jet spinning device 9 is drawn out by the yarn accumulating device 22, but the spun yarn 10 may be drawn out by providing the delivery roller and the nip roller instead of the yarn accumulating device 22. In this case, the delivery roller and the nip roller correspond to the yarn drawing device. Alternatively, a delivery roller and a nip roller may be provided between the air spinning device 9 and the yarn accumulating device 22. In this case, the delivery roller and the nip roller also correspond to the yarn drawing device. In this case, instead of the yarn accumulating roller 41, an air type loosening tube and/or a mechanical compensator may be provided as the yarn accumulating device 22. In any case, the first guide device 27 captures a yarn end from the air-jet spinning device 9 at a position downstream of the air-jet spinning device 9 and guides the yarn end to the yarn splicing device 23. The position downstream of the air-jet spinning device 9 may be any one of a position between the air-jet spinning device 9 and the delivery roller and a position downstream of the delivery roller.

In the above embodiment, the fiber running path is greatly curved by the yarn accumulating device 22, but each device may be arranged so that the fiber running path from the upstream end of the draft device 7 to the winding device 26 is not greatly curved. In this case, for example, the fiber running path of the draft device 7 is provided substantially perpendicular to the installation surface of the spinning unit 2.

In the above embodiment, the draft device drafts the fiber bundle by the plurality of draft rollers, but the fiber bundle may be drafted by the carding rollers.

In the above embodiment, the fiber guide portion 31 and the nozzle block 30 have been described as separate members, but may be formed of one member.

In the above embodiment, the first guide device 27, the second guide device 28, and the yarn joining device 23 are provided in each spinning unit 2, but the first guide device 27, the second guide device 28, and the yarn joining device 23 may be provided in a movable carriage and shared by a predetermined number of spinning units 2.

Claims

1. An air spinning machine is characterized by comprising:

a draft device for drafting the fiber bundle;

an air-jet spinning device for performing a normal spinning in which the fiber bundle over-drafted by the draft device is twisted by a whirling airflow to generate a spun yarn;

a yarn drawing device that draws out the spun yarn generated by the air-jet spinning device;

a suction unit that forms a suction port for a fiber running path between the air-jet spinning device and the yarn drawing device;

a winding device which is disposed at a position higher than an upstream end of a fiber traveling path of the draft device and winds the spun yarn drawn by the yarn drawing device to form a package;

a yarn joining device for joining yarns; and

a first guide device which catches a yarn end from the open-end spinning device and guides it to the yarn splicing device,

the air spinning device is provided with:

a fiber guide that guides the fiber bundle;

a nozzle block into which the fiber bundle guided by the fiber guide is introduced, and which is formed with a spinning chamber and a first nozzle through which air for generating a whirling airflow in the spinning chamber passes; and

a hollow guide shaft body into which the fiber bundle having passed through the nozzle block is introduced, and which is formed with a yarn passage and a second nozzle through which air ejected at least at the time of yarn discharge spinning passes,

the drafting device is driven in the drafting direction during the yarn-out spinning, and air is ejected from at least the second nozzle,

the suction unit sucks fiber waste generated when the open-end spinning device performs the yarn discharge spinning.

2. Rotor spinning machine according to claim 1,

the yarn splicing device further includes a second guide device that catches the yarn end from the package and guides the yarn end to the yarn splicing device.

3. Rotor spinning machine according to claim 1,

the first guide device is provided with a hollow member having a catching part and a rotation center,

when the first guide device is located at a catching position at which the yarn end from the air-jet spinning device is caught, the air-jet spinning device, the catching section, and the suction port are arranged in this order along a fiber traveling path.

4. Rotor spinning machine according to claim 1,

when the winding of the package by the winding device is interrupted, the yarn end of the package is positioned downstream of the suction port in the fiber traveling direction.

5. Rotor spinning machine according to claim 2,

6. Rotor spinning machine according to claim 3,

7. A rotor spinning machine according to any one of claims 1 to 6,

the suction unit includes an opening/closing unit provided in the suction port or a removal passage through which a suction airflow flows,

the opening/closing unit is capable of switching between an open state in which the suction port or the removal passage is opened to generate a suction airflow at the suction port, and a closed state in which the suction port or the removal passage is closed to prevent the suction port from generating the suction airflow.

8. Rotor spinning machine according to claim 7,

the open-close section is opened at least some time after the normal spinning by the air-jet spinning device is stopped and before the start of the yarn discharge spinning.

9. Rotor spinning machine according to claim 8,

the open-end spinning device is configured to be capable of contacting or separating the nozzle block with or from the hollow guide shaft body,

after the spun yarn is in the cut-off state and at least a certain period before the start of the yarn discharge spinning, a cleaning operation of ejecting air from the first nozzle is performed in a state where the nozzle block is separated from the hollow guide shaft body, and the opening/closing portion is opened at least a certain period during the cleaning operation.

10. Rotor spinning machine according to claim 9,

after the cleaning operation is finished and before the yarn-out spinning is started, the opening and closing part is switched to a closed state.

11. Rotor spinning machine according to claim 7,

the opening and closing part is in a closed state at the start time of yarn outlet spinning.

12. A rotor spinning machine according to any one of claims 8 to 11,

the drafting device performs drafting under the initial drafting condition during the yarn-out spinning, and then performs drafting under the normal drafting condition,

after the draft condition is changed from the draft start condition to the normal draft condition, the opening/closing section is switched from the open state to the closed state.

13. Rotor spinning machine according to claim 7,

14. A rotor spinning machine according to any one of claims 1-6, 8-11, 13,

an upstream end of a fiber traveling path of the draft device is disposed closer to the worker passage than a downstream end of the fiber traveling path of the air spinning device,

the yarn drawing device is disposed on the opposite side of the worker passage with the air-jet spinning device interposed therebetween.

15. Rotor spinning machine according to claim 7,

16. Rotor spinning machine according to claim 12,

17. A rotor spinning machine according to any one of claims 1-6, 8-11, 13, 15, 16,

the yarn feeding device is provided with a yarn monitoring device which is arranged between the air spinning device and the yarn drawing device in a fiber running path and monitors the spun yarn,

the suction port is disposed below a fiber running path between the yarn monitoring device and the yarn drawing device.

18. Rotor spinning machine according to claim 7,

19. Rotor spinning machine according to claim 12,

20. Rotor spinning machine according to claim 14,

the yarn feeding device includes a yarn monitoring device that is disposed between the air-jet spinning device and the yarn drawing device in a fiber traveling path and monitors the spun yarn,

21. A rotor spinning machine according to any one of claims 1-6, 8-11, 13, 15, 16,

a yarn monitoring device disposed between the yarn drawing device and the winding device in a fiber running path and monitoring the spun yarn,

the suction port is disposed below a fiber running path between the air-jet spinning device and the yarn drawing device.

22. Rotor spinning machine according to claim 7,

the suction port is disposed below a fiber travel path between the air-jet spinning device and the yarn drawing device.

23. Rotor spinning machine according to claim 12,

24. Rotor spinning machine according to claim 14,

25. A rotor spinning machine according to any one of claims 18-20, 22-24,

includes a suction guide part formed to extend from a suction port to an upstream side in a suction airflow direction,

the suction guide part is open at the upper part and is formed with a wall surface at the part except the upper part, and the suction guide part is in a shape that the interval of the wall surface of the side surface is narrowed along with approaching the suction opening.

26. A rotor spinning machine according to claim 17,

27. Rotor spinning machine according to claim 21,