CN105253703B - Yarn winding machine and yarn winding method - Google Patents

Abstract

the present invention relates to a yarn winding machine and a yarn winding method. A spinning unit (2) provided in a spinning machine is provided with a yarn feeding section (5), a winding device (26), a yarn splicing device (23), and a yarn splicing monitoring device (25). The yarn feeding section (5) feeds the spun yarn (10). The winding device (26) winds the spun yarn (10) into a package (50). The joint device (23) has a cutter (100). A yarn splicing monitoring device (25) monitors the spun yarn (10). A spinning machine (spinning unit 2) cuts the spun yarn (10) in a continuous state by a cutter (100) of the yarn splicing device (23) on the basis of the monitoring result of the yarn splicing monitoring device (25).

Description

Yarn winding machine and yarn winding method

Technical Field

The present invention relates generally to a yarn winding machine provided with a yarn splicing device.

Background

conventionally, a yarn winding machine that winds a yarn around a bobbin to form a package is known. The yarn winding machine generally includes a yarn monitoring device for detecting a defect of the yarn and a yarn splicing device for performing yarn splicing. Japanese patent laying-open No. 2013-067892 (patent document 1) discloses such a yarn winding machine.

the yarn winding machine of patent document 1 includes: a yarn supply section; a winding device for winding the yarn into a package; a package rotation speed detection unit that detects a rotation speed of the package; a piecing device for piecing the yarn to form a pieced yarn; a joint monitoring device for monitoring the joint; and a judging section for judging whether the joint is normal. The determination unit determines whether or not the yarn splicing device forms a normal yarn splice based on the yarn running speed obtained based on the detection result of the package rotation speed detection unit and the monitoring result of the yarn splicing monitoring device.

Patent document 1 describes that the quality of a yarn end can be accurately determined by accurately acquiring the yarn advancing speed at the time of restarting winding from an actually measured value of the rotational speed of the package, and determining the quality of the yarn end from the yarn advancing speed.

In the configuration of patent document 1, when a defective joint is detected by the joint monitoring device, the joint carriage having the joint device cuts the defective joint by a cutter provided separately from the joint device in order to remove the defective joint. However, when the cutter is separately provided, the cost increases accordingly. Further, when the yarn is cut by a cutter as in patent document 1 when a defective yarn joint is detected, the yarn may irregularly move due to a sharp release of tension applied to the yarn, or a twist of the yarn. This makes it difficult to catch the yarn ends, and the efficiency of the yarn splicing operation is reduced.

Disclosure of Invention

The invention aims to provide a yarn winding machine which can cut yarn without adding a cutter specially.

According to a first aspect of the present invention, a yarn winding machine includes a yarn feeding unit, a winding device, a yarn splicing device, and a yarn monitoring device. The yarn supplying section supplies a yarn. The winding device winds the yarn into a package. The joint device has a cutter. The yarn monitoring device monitors the yarn. The yarn in a continuous state is cut by the cutter of the yarn splicing device based on the monitoring result of the yarn monitoring device.

Thus, the yarn can be cut by the cutter provided in the yarn splicing device without providing a cutter in particular. Therefore, the yarn can be cut with a simple configuration according to the monitoring result of the yarn monitoring device.

In the yarn winding machine, the yarn monitoring device is disposed downstream of the yarn splicing device in a traveling direction of the yarn when the package is wound. The yarn is cut by the cutter based on the monitoring result of the yarn monitoring device.

Thus, the yarn joint formed by the yarn joint device can be fed downstream by the winding of the winding device, and whether the yarn joint is good or not can be immediately determined by the yarn monitoring device. Therefore, when the formed joint is good, the winding can be continued as it is, and even if the joint is poor, the joint is poor can be detected at the initial stage of the acceleration of the winding speed of the winding device, and the winding can be stopped in a short time. As a result, when the joint is performed again, the joint can be efficiently performed.

In the yarn winding machine, it is preferable that the yarn monitoring device stops winding by the winding device when the yarn monitoring device detects that the yarn splice is defective, and then the cutter cuts the yarn.

thus, the cut yarn end is not wound around the package of the winding device. Therefore, when the yarn end is pieced again, the yarn end can be reliably caught.

In the yarn winding machine, the yarn splicing device includes a holding portion for holding the yarn. The yarn cutting device cuts the yarn while the holding portion holds the yarn, based on a monitoring result of the yarn monitoring device.

this prevents the yarn end formed by cutting the yarn from being disturbed by sudden release of the tension of the yarn and/or twisting of the yarn.

in the yarn winding machine, it is preferable that the holding portion holds the yarn at a position downstream of a cutting position at which the cutter cuts the yarn in a traveling direction of the yarn during winding of the package.

With this, the downstream side (package side) of the yarn ends formed by cutting the yarn can be held by the holding section. Therefore, since the yarn end connected to the package can be prevented from being disturbed, the yarn end can be efficiently pieced when the yarn end is pieced again.

The yarn winding machine includes a yarn catching section that catches the yarn from the package. The holding portion releases the holding of the yarn after the yarn catching portion moves to a position where the yarn held by the holding portion can be caught.

Thus, the yarn is held by the holding portion so as to be immobilized, and the yarn is delivered to the yarn catching portion, so that the yarn catching member can catch the yarn very easily. Therefore, the yarn catching operation can be smoothly performed, and the efficiency of the yarn splicing operation can be further improved.

in the yarn winding machine, the yarn splicing device includes a yarn guide member and a yarn poking rod. The yarn guide member has a first slit and a second slit formed therein. A first yarn end, which is a yarn end of the yarn from the yarn feeding portion, is guided into the first slit for yarn splicing. A second yarn end, which is a yarn end of the yarn from the package, is guided into the second slit for yarn splicing. In order to perform the yarn splicing, the yarn poking rod performs a yarn poking action of poking the first yarn head to the back side of the first slit and poking the second yarn head to the back side of the second slit. The yarn guide member includes a first cutting guide portion that guides the yarn to one of the first slit and the second slit when the yarn pulling operation is performed by the yarn pulling lever in order to cut the yarn in a continuous state.

thus, the continuous yarn is accurately guided into the slit for cutting by the first cutting guide portion of the yarn guide member. As a result, the yarn can be reliably cut.

in the yarn winding machine, the yarn splicing device includes a yarn guide member and a yarn poking rod. The yarn guide member has a first slit and a second slit formed therein. A first yarn end, which is a yarn end of the yarn from the yarn feeding portion, is guided into the first slit for yarn splicing. A second yarn end, which is a yarn end of the yarn from the package, is guided into the second slit for yarn splicing. In order to perform the yarn splicing, the yarn poking rod performs a yarn poking action of poking the first yarn head to the back side of the first slit and poking the second yarn head to the back side of the second slit. The yarn poking bar includes a second cutting guide portion that guides the yarn toward one of the first slit and the second slit when the yarn poking operation is performed by the yarn poking bar in order to cut the yarn in a continuous state.

Thus, the continuous yarn is accurately guided into the slit for cutting by the second cutting guide portion of the yarn poking bar. As a result, the yarn can be reliably cut.

The yarn winding machine includes a control unit. The control unit controls the yarn splicing device to cut the yarn in a continuous state based on a monitoring result of the yarn monitoring device.

Thus, the yarn can be automatically cut by the cutter of the yarn splicing device based on the monitoring result of the yarn monitoring device.

According to a second aspect of the present invention, a yarn winding method relates to a method of winding a yarn in a yarn winding machine having a yarn feeding unit, a winding device, a yarn splicing device, and a yarn monitoring device. The yarn supplying section supplies a yarn. The winding device winds the yarn into a package. The yarn splicing device can splice the yarns. The yarn monitoring device monitors the yarn. In the yarn winding method, the yarn is cut by the yarn splicing device based on a monitoring result of the yarn monitoring device.

thus, the yarn can be cut by the yarn splicing device without particularly providing a structure for cutting the yarn. Therefore, according to the yarn winding method, the yarn can be efficiently wound.

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 perspective view of the joint device as viewed from the side.

Fig. 3 is a perspective view of the joint device viewed from the front side.

Fig. 4 is a block diagram showing a configuration for controlling the spinning unit.

Fig. 5 is a side view showing a state where the yarn catching guide device catches the yarn.

Fig. 6 is a side view showing a state where the yarn catching and guiding device guides the spun yarn to the yarn splicing device.

Fig. 7 is a side view showing a state at the moment when the spun yarn starts to be wound around the yarn accumulating device.

fig. 8 is a side view showing a case where the yarn is cut by a cutter of the yarn splicing device and held by a clamping portion of the yarn splicing device when a defective yarn splicing operation is detected.

Fig. 9 is a side view of a state where the thread end held by the piecing device is caught by the second catching guide.

Detailed Description

Next, a spinning frame according to an embodiment of the present invention will be described with reference to the drawings. In the following description, "upstream" and "downstream" mean upstream and downstream in the traveling direction of the fiber bundle and the spun yarn when the yarn is wound.

A spinning machine (spinning machine, yarn winding machine) includes a plurality of spinning units (yarn winding units) 2 arranged side by side, and a not-shown body control device that collectively manages the plurality of spinning units 2. As shown in fig. 1, each spinning unit 2 winds the yarn (spun yarn 10) supplied from the yarn supplying section 5 by the winding device 26 to form a package 50.

The spinning machine includes a control unit (reference numeral 80 in fig. 4) capable of communicating with the machine body control device. The control Unit 80 is configured as a computer including hardware such as a Central Processing Unit (CPU), a Read Only Memory (ROM), a Random Access Memory (RAM), and software such as a control program, and controls each Unit included in the spinning Unit 2. The control section 80 may be provided for each spinning unit 2, or may be provided for each of a plurality of spinning units 2.

As shown in fig. 1, the spinning unit 2 includes a yarn supplying section 5, a yarn accumulating device 22, and a winding device 26 in this order from upstream to downstream.

The yarn supplying section 5 supplies the yarn (spun yarn 10) wound by the winding device 26. In the present embodiment, the yarn feeding section 5 includes a draft device 7, a spinning device 9, a delivery roller 21, and a pinch roller 31.

The draft device 7 includes four draft rollers and opposed rollers opposed to the draft rollers. The four draft rollers are a rear roller 16, a third roller 17, an intermediate roller 19 to which a rubber belt 18 is attached, and a front roller 20 in this order from the upstream side. Each draft roller is rotationally driven at a predetermined speed.

The draft device 7 generates the fiber bundle 8 by sandwiching and conveying the sliver 15 supplied from a sliver box (not shown) via a guide frame between the draft roller and the counter roller, thereby stretching (drafting) the sliver 15 to a predetermined fiber amount (or thickness).

the spinning device 9 is disposed immediately downstream of the front roller 20. The spinning device 9 twists the fiber bundle 8 supplied from the draft device 7 to generate a spun yarn 10. The spinning device 9 of the present embodiment is configured as an air-flow type spinning device as follows: a whirling airflow is generated inside, and the whirling airflow is caused to act on the fiber bundle 8 to twist the same.

A delivery roller 21 rotationally driven at a predetermined speed and a pinch roller 31 contactable with and separable from the delivery roller 21 are provided downstream of the spinning device 9. The spun yarn 10 discharged from the spinning device 9 can be transported downstream by sandwiching the spun yarn 10 between the delivery roller 21 and the pinch roller 31 and rotationally driving the delivery roller 21.

The spun yarn 10 is supplied to the winding device 26 through the yarn supplying section 5 (the draft device 7, the spinning device 9, the delivery roller 21, and the pinch roller 31) configured as described above. The delivery roller 21 and the pinch roller 31 may be omitted, and the spun yarn 10 may be drawn out from the spinning device 9 by the yarn accumulating device 22.

a yarn quality monitoring device 40 that monitors the quality of the spun yarn 10 is provided immediately downstream of the delivery roller 21 and the pinch roller 31. The yarn quality monitoring device 40 monitors the state (thickness, etc.) of the traveling spun yarn 10 by a light-transmissive sensor, and detects a yarn defect (a portion where the spun yarn 10 is abnormal) included in the spun yarn 10. The yarn quality monitoring device 40 is not limited to a light-transmissive sensor, and may monitor the spun yarn 10 by a capacitance-type sensor, for example. Further, as the yarn defect, a foreign matter contained in the spun yarn 10 may be monitored.

when a yarn defect is detected by the yarn quality monitoring device 40, the spinning is stopped in the spinning device 9, and therefore the strength of the spun yarn 10 is reduced in a part of the spinning device 9, and the spun yarn 10 is cut. In this way, the spinning device 9 has a function as a cutting section for cutting the spun yarn 10 when the yarn quality monitoring device 40 detects a yarn defect. This eliminates the need to specially provide a cutter in the yarn quality monitoring device 40, for example, and enables a simple configuration. However, a cutter may be provided in the yarn quality monitoring device 40 or the like.

The winding device 26 winds the spun yarn 10 around the bobbin 51 while traversing the spun yarn to form a package 50. The winding device 26 includes a rocker arm 52 and a winding drum 53.

The cradle arm 52 includes a support portion 55 that rotatably supports the bobbin 51, and can bring the outer peripheral surface of the package 50 into contact with the outer peripheral surface of the winding drum 53. The winding drum 53 is rotationally driven in a state where the package 50 is in contact with the winding drum 53, whereby the package 50 is rotationally driven. Thereby, the spun yarn 10 is gradually wound into the package 50. A traverse groove, not shown, is formed on the outer peripheral surface of the winding drum 53. The spun yarn 10 wound around the package 50 is traversed (reciprocated) at a predetermined width by the traverse groove.

The winding device 26 includes a braking mechanism, not shown, for braking rotation of the package 50. The braking mechanism may have any configuration, and may include, for example, a brake shoe that contacts a member that rotates integrally with the package 50, and a pneumatic cylinder that presses the brake shoe.

The yarn accumulating device 22 is disposed between the yarn supplying section 5 and the winding device 26 and immediately downstream of the yarn quality monitoring device 40. The yarn accumulating device 22 includes a yarn accumulating roller 41 and an accumulating motor 42 for rotationally driving the yarn accumulating roller 41. The yarn accumulating device 22 temporarily accumulates the spun yarn 10 by winding the spun yarn 10 around the outer peripheral surface of the yarn accumulating roller 41.

a yarn hooking member 43 is attached to a downstream end of the yarn accumulating roller 41. The yarn hooking member 43 is supported to be rotatable relative to the yarn accumulating roller 41. A permanent magnet is attached to either the yarn hooking member 43 or the yarn accumulating roller 41, and a hysteresis material is attached to the other. These magnetic means generate a torque against the relative rotation of the yarn hooking member 43 with respect to the yarn accumulating roller 41. Therefore, only when a force exceeding the torque is applied to the yarn hooking member 43 (when a 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 rotates integrally with the yarn hooking member 43, 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 tends 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, as described above, since the yarn hooking member 43 operates to absorb the variation in the yarn tension applied to the spun yarn 10 between the yarn accumulating device 22 and the winding device 26, the yarn hooking member 43 can prevent the variation in the yarn tension from affecting the spun yarn 10 from the spinning device 9 to the yarn accumulating device 22.

The accumulating motor 42 is configured as an electric motor capable of rotating forward and backward, and can rotate the yarn accumulating roller 41 backward in order to forcibly unwind the spun yarn 10 wound around the yarn accumulating roller 41.

a second yarn guide 62 is provided downstream of the yarn accumulating roller 41, and the second yarn guide 62 suppresses the movement of the spun yarn 10 unwound from the yarn accumulating roller 41.

Downstream of the second yarn guide 62, a piecing device 23 is provided. When the spun yarn 10 between the spinning device 9 and the package 50 is in the broken state for some reason, the yarn splicing device 23 splices the spun yarn 10 (first yarn) from the spinning device 9 and the spun yarn 10 (second yarn) from the package 50. In the present embodiment, the splicer device 23 is a splicing device that splices yarn ends together by a whirling airflow generated by compressed air. However, the splicing device 23 is not limited to the splicing device described above, and a mechanical splicing device or the like can be used, for example.

The spinning unit 2 includes a catching and guiding device that guides the spun yarn 10 to the yarn splicing device 23. The catching guide device is composed of a first catching guide device 27 for guiding the first yarn and a second catching guide device (yarn catching part) 28 for guiding the second yarn.

A base end portion of the first catching guide 27 is supported to be rotatable. The first catching guide 27 is rotatable in the up-down direction with the base end portion as a rotation center. The first catching guide device 27 is formed in a hollow shape, is connected to a blower, not shown, as a negative pressure source, and can generate a suction airflow at a tip end portion thereof. The first catching guide 27 can be moved to a position where it can catch the yarn end of the first yarn by rotating downward (see the chain line in fig. 1). The first catching guide 27 can guide the first yarn to the yarn splicing device 23 by rotating upward after catching the first yarn.

A base end portion of the second catching guide 28 is supported to be rotatable. The second catching guide 28 is rotatable in the up-down direction with the base end portion as a rotation center. The second catching guide 28 is also hollow, is connected to a blower, not shown, as a negative pressure source, and can generate a suction airflow at the tip end portion. The second catching guide 28 can move to a position where it can catch the yarn end of the second yarn by rotating upward (see the chain line in fig. 1). The second catching guide device 28 can guide the second yarn to the yarn splicing device 23 by rotating downward after catching the second yarn.

By driving the yarn splicing device 23 in this state, the first yarn and the second yarn are spliced, and the spun yarn 10 is made continuous between the spinning device 9 and the package 50. This can restart the winding of the spun yarn 10 into the package 50.

a yarn splicing monitoring device (yarn monitoring device) 25 is disposed between the yarn splicing device 23 and the winding device 26. The joint monitoring device 25 is disposed downstream of the joint device 23, and can determine whether or not a joint formed by the joint of the joint device 23 is good. In the present embodiment, the joint monitoring device 25 is configured to check the thickness of the joint or the like by a capacitance type or light transmission type sensor, as in the yarn quality monitoring device 40. However, the configuration of the joint monitoring device 25 is not particularly limited to the configuration having these sensors. The yarn splicing monitoring device 25 may monitor not only yarn splicing but also an abnormality in the thickness of the spun yarn 10 and/or whether the spun yarn 10 contains foreign matter, as in the yarn quality monitoring device 40.

A third yarn guide 63 for guiding the spun yarn 10 is arranged immediately downstream of the yarn splicing monitoring device 25. The third yarn guide 63 guides the spun yarn 10 so as to curve its traveling path and direct it toward the winding device 26.

Next, the joint device 23 will be described in detail with reference to fig. 2 and 3. The yarn splicing device 23 mainly includes a yarn splicing nozzle 92, yarn guide plates (yarn guide members) 93 and 94, yarn poking rods 95 and 96, nipping portions 97 and 98, yarn pressing rods 103 and 104, cutters 99 and 100, and untwisting chambers 105 and 106.

As shown in fig. 3, the yarn splicing nozzle 92 is disposed on the front surface side of the yarn splicing device 23 (on the side facing the traveling path of the spun yarn 10). The joint nozzle 92 is formed with a V-shaped groove that opens toward the traveling path of the spun yarn 10, and a twist chamber 92a is formed on the back side of the groove. Twisting chamber 92a is formed in a cylindrical shape with both ends open in the yarn traveling direction. A slit is formed on the front side of the twisting chamber 92 so that the spun yarn 10 can enter the inside of the twisting chamber 92 a. The joint nozzle 92 jets compressed air into the twisting chamber 92a, thereby generating a whirling airflow inside the twisting chamber 92a, and connects the first yarn guided by the first catching guide device 27 and the second yarn guided by the second catching guide device 28 to form a joint.

The yarn guide plate 93, the yarn poking bar 95, the clamping portion 97, the yarn pressing bar 103, the cutter 99, and the untwisting chamber 105 are disposed upstream of the piecing nozzle 92. The yarn guide plate 94, the yarn poking rod 96, the clamping portion 98, the yarn pressing rod 104, the cutter 100, and the untwisting chamber 106 are disposed downstream of the piecing nozzle 92.

Each of the yarn guide plates 93 and 94 is formed in a plate shape and arranged substantially perpendicular to a traveling path of the spun yarn 10 in normal winding. The "normal winding time" is a time when the spun yarn 10 is in a continuous state between the yarn feeding unit 5 and the winding device 26 and the spun yarn 10 is being wound by the winding device 26.

The yarn guide plate 93 has two slits, i.e., a first slit 101 and a second slit 102, which are arranged in parallel and open to the side of the traveling path of the spun yarn 10. The guide plate 94 is provided with two slits, i.e., a first slit 201 and a second slit 202, which are arranged in parallel and open to the side of the traveling path of the spun yarn 10. As shown in fig. 3, the first slit 101 of the yarn guide plate 93 and the first slit 201 of the yarn guide plate 94 are arranged at positions substantially corresponding to each other in the direction of the traveling path of the spun yarn 10. The second slit 102 of the yarn guide plate 93 and the second slit 202 of the yarn guide plate 94 are arranged at positions substantially corresponding to each other in the direction of the traveling path of the spun yarn 10.

When the spun yarn 10 that has been cut is spliced by the splicing device 23, the first yarn catching guide device 27 guides the first yarn to the inside of the first slits 101 and 201, and the second yarn catching guide device 28 guides the second yarn to the inside of the second slits 102 and 202.

The two yarn-pulling levers 95 and 96 are configured to be simultaneously rotatable about an axis disposed laterally with respect to the connector nozzle 92 in a direction (closing direction) of entering between the yarn-guiding plates 93 and 94 and in a direction (opening direction) of exiting from between the yarn-guiding plates 93 and 94. By rotating the yarn levers 95 and 96 in the closing direction, the first yarn guided by the first catching guide 27 can be pushed into the back side of the first slits 101 and 201, and the second yarn guided by the second catching guide 28 can be pushed into the back side of the second slits 102 and 202. The yarn levers 95 and 96 are rotated in the closing direction, whereby the first yarn and the second yarn can be guided into the twisting chamber 92 a.

the clamping portion 97 is attached to the yarn guide plate 93. The clamping portion 98 is mounted to the guide plate 94. The clamping portions 97 and 98 can clamp the spun yarn 10 therebetween. Specifically, the nip portion 97 can nip and hold the spun yarn 10 entering the first slits 101 and 201. The nip portion (holding portion) 98 can nip and hold the spun yarn 10 entering the second slits 102 and 202.

The yarn pressing levers 103 and 104 are provided so as to be simultaneously rotatable around axes disposed near the rotational axes of the yarn poking levers 95 and 96. The yarn pressing levers 103 and 104 are configured to be capable of pressing the first yarn and the second yarn by rotating in the closing direction to position the first yarn and the second yarn for performing yarn splicing by the yarn splicing nozzle 92.

The cutter 99 is attached to the yarn guide plate 93. A cutter 100 is mounted to the guide plate 94. The cutters 99 and 100 can cut the spun yarn 10. Specifically, the cutter 99 can cut the spun yarn 10 entering the first slits 101 and 201, and the cutter 100 can cut the spun yarn 10 entering the second slits 102 and 202.

As shown in fig. 2, the untwisting chambers 105 and 106 are respectively formed as elongated spaces. The opening of the untwisting chamber 105 and the opening of the untwisting chamber 106 are disposed with the adapter nozzle 92 interposed therebetween. The first yarn can be sucked into the detwisting chamber 105, and the second yarn can be sucked into the detwisting chamber 106. By blowing compressed air into the untwisting chambers 105 and 106, a twisted airflow is generated inside the untwisting chambers 105 and 106. Before the yarn end of the first yarn is pieced by the piecing nozzle 92, the yarn end of the first yarn is sucked into the untwisting chamber 105 and untwisted by the air of the twist current, and the yarn end of the second yarn is sucked into the untwisting chamber 106 and untwisted by the air of the twist current.

the joint device 23 includes a cam not shown. By this cam rotation, the yarn pulling operation of the yarn pulling levers 95 and 96, the clamping operation of the clamping portions 97 and 98, the cutting operation of the cutters 99 and 100, and the pressing operation of the yarn pressing levers 103 and 104 described above are performed. The joint device 23 further includes a valve, not shown, which is opened and closed to control supply and stop of the compressed air to the joint nozzle 92 and the untwisting chambers 105 and 106, respectively. The valve is also opened in conjunction with the rotation of the cam.

the joint device 23 having the above configuration performs the following joint operation. That is, the first yarn entering the first slits 101 and 201 and the second yarn entering the second slits 102 and 202 are shifted by the yarn-shifting levers 95 and 96 rotated in the closing direction so as to be introduced into the interior of the connector nozzle 92. In this state, the first yarn and the second yarn are clamped by the clamping portions 97 and 98. Thereafter, the cutter 99 cuts the first yarn, and the cutter 100 cuts the second yarn. The excess portion of the first yarn is sucked by the first catching guide 27 and discarded. The excess portion of the second yarn is sucked by the second catching guide 28 and discarded. The first yarn cut to a predetermined length is sucked into the untwisting chamber 105 and untwisted by the whirling airflow. The second yarn cut to a predetermined length is sucked into the untwisting chamber 106 and untwisted by the twist airflow. Thereafter, the yarn pulling levers 95 and 96 are further rotated in the closing direction, whereby the untwisted portion of the first yarn is pulled out of the untwisting chamber 105 and the untwisted portion of the second yarn is pulled out of the untwisting chamber 106. Then, the untwisted portion of the first yarn and the untwisted portion of the second yarn are introduced into twisting chamber 92a of piecing nozzle 92. In this state, the yarn pressing levers 103 and 104 are rotated in the closing direction, and the positions of the first yarn and the second yarn are determined by the yarn pressing levers 103 and 104. Then, the untwisted portions are twisted with each other by the whirling airflow generated in the twisting chamber 92a, whereby the first yarn and the second yarn are connected to be in a continuous state. Then, the yarn pressing levers 103 and 104 rotate in the opening direction to release the spun yarn 10, and the yarn poking levers 95 and 96 also rotate in the opening direction to return the spun yarn 10 to the travel path during normal winding.

Next, an electrical configuration of the spinning unit 2 will be described with reference to fig. 4. The spinning unit 2 includes the control unit 80, the yarn quality monitoring device 40, the accumulating motor 42, and the yarn splicing monitoring device 25, as well as a draft motor 111, a spinning valve 112, a delivery motor 113, a catching guide motor 114, a yarn splicing cam motor 115, a winding drum motor 116, and a winding brake valve 117.

The draft motor 111 is, for example, a plurality of electric motors, and can drive the rear roller 16, the third roller 17, the intermediate roller 19, and the front roller 20 of the draft device 7 at predetermined speeds.

The spinning valve 112 is configured as an electromagnetic valve disposed in a path for supplying compressed air from an appropriate compressed air source to the spinning device 9. The spinning valve 112 can switch whether or not a whirling airflow for twisting and spinning the fiber bundle 8 in the spinning device 9 is generated.

The delivery motor 113 is an electric motor capable of driving the delivery roller 21 at a predetermined speed.

The catching guide motor 114 is an electric motor capable of rotating the first catching guide device 27 and the second catching guide device 28 up and down, and capable of rotating in the forward direction and the reverse direction.

The joint cam motor 115 is an electric motor capable of rotationally driving a cam, not shown, provided in the joint device 23. As described above, the cam operates the yarn poking levers 95 and 96, the yarn pressing levers 103 and 104, the clamping portions 97 and 98, the cutters 99 and 100, and the like of the yarn splicing device 23. Further, since the joint cam motor 115 is configured as a motor capable of not only forward rotation but also reverse rotation, the joint device 23 can be operated in reverse to the normal operation in a predetermined case.

The take-up drum motor 116 is an electric motor that can rotationally drive the take-up drum 53. The take-up drum motor 116 can rotate the take-up drum 53 in the normal and reverse directions.

The take-up brake valve 117 is an electromagnetic valve disposed on a path for supplying compressed air to an appropriate actuator (e.g., a pneumatic cylinder) for operating a brake mechanism of the take-up device 26. The winding brake valve 117 is configured to be capable of switching between braking and braking release of the package 50 in the winding device 26.

As described above, the control unit 80 controls each unit of the spinning unit 2. Specifically, the draft motor 111, the delivery motor 113, the accumulating motor 42, the catching guide motor 114, the joint cam motor 115, and the take-up drum motor 116 are electrically connected to the control unit 80, respectively, and the control unit 80 can control the rotation/stop, the rotation speed, and the like of each motor. The spinning valve 112 and the winding brake valve 117 are also electrically connected to the control unit 80, and the control unit 80 can control opening and closing of the valves. The yarn quality monitoring device 40 and the yarn joint monitoring device 25 are electrically connected to the control unit 80, and can output monitoring results regarding whether the yarn quality and the yarn joint are good or not to the control unit 80.

next, the operation of the spinning unit 2 at the time of splicing will be described with reference to fig. 5 to 7.

When two typical cases of the spun yarn 10 breaking are cited, one case is: the spun yarn 10 is wound into the package 50 with yarn breakage. The other condition is that: when the yarn quality monitoring device 40 detects a yarn defect and the spinning of the spinning device 9 is stopped, the spun yarn 10 is partially cut in the spinning device 9. Even when the yarn splicing monitoring device 25 detects a yarn splicing failure, the spun yarn 10 is cut and is set to the disconnected state, and then yarn splicing is performed again. However, since the operation of the spinning unit 2 in this case is different from that of a normal yarn splicing operation, this operation will be described later.

For example, when the yarn quality monitoring device 40 detects a yarn defect, the control unit 80 controls the spinning valve 112 to be closed and stops the winding drum motor 116 and the draft motor 111. As a result, the spinning device 9 stops spinning, the winding device 26 stops winding the package 50, and the draft device 7 stops drafting the fiber bundle 8. The control unit 80 controls an actuator (not shown) to move the first yarn carrier 61 from the state shown in fig. 1 to a position away from the yarn accumulating device 22 (see fig. 5).

Then, the control unit 80 controls the catching guide motor 114 to rotate so that the second catching guide device 28 is turned upward from the state of fig. 1. Thus, as shown in fig. 5, the front end of the second catching guide device 28 approaches the outer peripheral surface of the package 50, and therefore the second catching guide device 28 can catch the second yarn by suction. Thereafter, the control section 80 controls the winding drum motor 116 to rotate reversely for a predetermined amount to rotate the package 50 reversely. The control unit 80 further drives the catching guide motor 114. As a result, as shown in fig. 6, the second catching guide device 28 guides the second yarn to a position where the yarn splicing by the yarn splicing device 23 can be performed. As a result, the second yarn is guided into the second slit 102 formed in the yarn guide plate 93 of the piecing device 23 and the second slit 202 formed in the yarn guide plate 94.

Before, after, or substantially simultaneously with the above operation, the control section 80 controls the draft motor 111 and the spinning valve 112 to restart the drafting of the fiber bundle 8 by the draft device 7 and the spinning by the spinning device 9. Before that, the control unit 80 controls the catching guide motor 114 to rotate so that the first catching guide device 27 is turned downward from the state of fig. 1. Thereby, as shown in fig. 5, the first catching guide device 27 can attract and catch the first yarn generated by the spinning device 9. The control unit 80 further rotates the catching guide motor 114, and as shown in fig. 6, the first catching guide device 27 guides the first yarn to a position where the yarn splicing by the yarn splicing device 23 can be performed. As a result, the first yarn is guided into the first slit 101 formed in the yarn guide plate 93 and the first slit 201 formed in the yarn guide plate 94 of the piecing device 23.

As described above, the first yarn and the second yarn can be guided to the yarn splicing device 23 as shown in fig. 6.

after the first catching guide device 27 and the second catching guide device 28 guide the first yarn and the second yarn to the yarn splicing device 23, the control unit 80 controls the first yarn guide 61 to move so as to approach the yarn accumulating device 22 (see fig. 7). Thereby, the spun yarn 10 is guided to the vicinity of the yarn accumulating device 22, and therefore the yarn hooking member 43 of the yarn accumulating device 22 can hook the spun yarn 10. As a result, the spun yarn 10 starts to be accumulated in the yarn accumulating roller 41.

At substantially the same time, the control unit 80 controls the joint cam motor 115 to rotate. Thereby, the yarn splicing device 23 performs the yarn splicing operation as described above to connect the first yarn and the second yarn.

When the splicing is completed, the control section 80 controls so as to start the rotation of the take-up drum motor 116. As a result, the stopped winding drum 53 and the like are driven again to return to the state of fig. 1, and the winding of the package 50 can be resumed.

Next, a description will be given of control for monitoring (checking) a formed yarn end after yarn end is performed in the yarn end device 23 of the spinning unit 2, and removing the yarn end if the yarn end is defective.

After the yarn 10 is spliced by the splicing device 23, the control section 80 controls the winding drum motor 116 to rotate the package 50 stopped by the winding device 26. However, before the splice is detected by the splice monitoring device 25, the control unit 80 controls the winding drum motor 116 so that the acceleration of the rotation of the package 50 becomes smaller than normal.

As the spun yarn 10 is gradually wound around the winding device 26, the yarn joint formed by the yarn joint of the yarn joint device 23 passes through the yarn joint monitoring device 25. The joint monitoring device 25 checks the joint and determines whether the joint is good. When the splice monitoring device 25 determines that the splice is good, the control unit 80 controls the take-up drum motor 116 so that the rotation speed of the package 50 is increased at a normal (large) acceleration. In the spinning unit 2, the spun yarn 10 is wound while being monitored by the yarn quality monitoring device 40.

When the yarn splicing monitoring device 25 determines that the yarn splicing is defective, the control unit 80 controls the winding drum motor 116 and the winding brake valve 117 so as to immediately stop the rotation of the package 50. Further, since the acceleration of the rotation of the package 50 is initially gentle as described above, the rotation speed of the package 50 at the time when the joint monitoring device 25 determines whether or not the joint is good is not so large. The braking mechanism immediately brakes the rotation of the package 50, and therefore the time until the stop of the rotation of the package 50 is detected from the defective joint can be shortened.

When the yarn splicing failure is detected by the yarn splicing monitoring device 25, the control unit 80 controls the spinning valve 112 to stop the supply of the compressed air to the spinning device 9. As a result, the spun yarn 10 is cut by the spinning device 9. Then, the control section 80 stops the draft motor 111, the delivery motor 113, and the like.

next, the control unit 80 controls the yarn splicing cam motor 115 to rotate the cam of the yarn splicing device 23 by a predetermined angle, and performs a part of the yarn splicing operation (that is, until the yarn pulling operation of the yarn pulling levers 95 and 96, the clamping operation of the clamping units 97 and 98, and the cutting operation of the cutters 99 and 100). As a result, the spun yarn 10 in the traveling path (continuous state) in the normal winding is pulled to the yarn splicing device 23 by the yarn pulling levers 95 and 96. The yarn guide plate 94 and the yarn hooking lever 95 have a predetermined shape, and when the spun yarn 10 in a continuous state is hooked to the piecing nozzle 92 (the twisting chamber 92a) by the yarn hooking levers 95 and 96 in this manner, the spun yarn 10 enters the second slits 102 and 202 without entering the first slits 101 and 201, which will be described in detail later. Therefore, the spun yarn 10 in a continuous state by the yarn pulling levers 95 and 96 is inserted into the second slits 102 and 202, clamped by the clamping portion 98, and cut by the cutter 100.

Thereby, the second yarn is gripped by the gripping portion 98, and the first yarn is dropped from the yarn splicing device 23. Further, since the first yarn is discarded as described later, it is not necessary to perform clamping.

the control unit 80 controls the accumulating motor 42 to be reversely rotated while maintaining the state where the second yarn is gripped by the yarn splicing device 23. As a result, the yarn accumulating roller 41 of the yarn accumulating device 22 rotates in reverse, and the spun yarn 10 (first yarn) accumulated in the yarn accumulating roller 41 is unwound and sucked into a suction portion (not shown) to be discarded.

The control unit 80 controls the second catching guide device 28 to rotate upward once by driving the catching guide motor 114 from the state of fig. 8. However, in this case, the control unit 80 controls the second catching guide device 28 to be temporarily stationary at the position of the solid line in fig. 9 where the tip end thereof is located near the clamping portion 98 of the joint device 23 in the middle of the upward turning stroke. In this state, the control unit 80 controls the joint cam motor 115 to be reversed, releases the clamping of the second yarn by the clamping unit 98, and rotates the yarn levers 95 and 96 in the opening direction. Thereby, the second yarn is caught by the second catching guide 28.

As described above, in the present embodiment, the yarn end of the second yarn is gripped by the gripping portion 98 before being caught by the second catching guide 28. Therefore, for example, compared to the case where the yarn end of the second yarn is wound into the package 50, the position of the yarn end is stable, and therefore, the catching error of the second catching guide device 28 can be extremely favorably reduced.

After the nip of the nip portion 98 is released, the control portion 80 controls to rotate the winding drum motor 116 in reverse in order to rotate the package 50 in reverse by a predetermined amount. At this time, the package 50 is inverted by an amount that the joint determined to be defective by the joint monitoring device 25 is pulled out from the package 50 by a sufficient distance.

Thereafter, the control unit 80 controls the catching guide motor 114 to rotate the second catching guide device 28 downward. Thereby, the second catching guide device 28 guides the second yarn to a position where the yarn splicing by the yarn splicing device 23 can be performed. As a result, the second yarn is guided into the second slit 102 formed in the yarn guide plate 93 of the piecing device 23 and the second slit 202 formed in the yarn guide plate 94.

Before, after, or substantially simultaneously with the above operation, the control section 80 restarts the drafting of the fiber bundle 8 by the draft device 7 and the spinning by the spinning device 9. Before that, the control unit 80 controls the first catching guide device 27 to be rotated downward from the state of fig. 8 in advance. Thereby, the first yarn generated by the spinning device 9 can be caught by the first catching guide device 27. As a result, the first yarn is guided into the first slit 101 formed in the yarn guide plate 93 and the first slit 201 formed in the yarn guide plate 94 of the piecing device 23.

As a result of the above operation, the first yarn and the second yarn are arranged in the same manner as in the state of fig. 6, and therefore the control unit 80 controls the yarn splicing device 23 to perform a normal yarn splicing operation. The yarn splicing operation is the same as that in the yarn defect detection by the yarn quality monitoring device 40, and therefore, the description thereof is omitted. When the yarn splicing is completed, the state of the spun yarn 10 returns to the state shown in fig. 1, and therefore the control section 80 controls the winding drum motor 116 to rotate the package 50 stopped in the winding device 26. The newly formed joint is checked by the joint monitoring device 25 in the same manner as the previous joint.

As described above, the spinning unit 2 of the spinning machine according to the present embodiment is configured such that, when the yarn splicing monitoring device 25 detects a defective yarn splicing, the yarn 10 is cut not by a cutter provided in particular but by the cutter 100 for cutting an excess yarn at the time of yarn splicing in the yarn splicing device 23. Therefore, since it is not necessary to add a cutter to the spinning unit 2, a simple configuration can be realized, and the cost can be reduced. Before the spun yarn 10 is cut by the cutter 100 of the yarn splicing device 23, a portion of the spun yarn 10 on the downstream side of the cutting portion (a position close to the package 50) is nipped by the nip portion 98. Therefore, the second yarn is gripped by the gripping section 98 from the time of yarn cutting, and the second catching guide device 28 catches the second yarn so as to deliver the second yarn from the gripping section 98. Therefore, the second yarn does not move irregularly due to the cutting of the spun yarn 10, and therefore the second catching guide device 28 can smoothly catch the second yarn, and a defective joint can be efficiently removed.

Next, a configuration for smoothly feeding the spun yarn 10 into the second slits 102 and 202 in order to cut the spun yarn 10 in a continuous state by the cutter 100 when a defective yarn joint is found will be described.

As described above, when the yarn splicing failure is detected by the yarn splicing monitoring device 25, the yarn splicing device 23 cuts the spun yarn 10 while holding the portion of the spun yarn 10 on the downstream side of the cutting portion. Therefore, the spun yarn 10 in a continuous state needs to enter the second slits 102 and 202. When the spun yarn 10 is supposed to enter the first slits 101 and 201, the spun yarn 10 is cut by the cutter 99, and the first yarn on the upstream side of the cutting portion (position close to the yarn feeding portion 5) is nipped by the nip portion 97. In this case, the second yarn is not nipped, and therefore, the spun yarn 10 cannot be prevented from being disturbed by the bouncing of the cutting. In other words, the second yarn cannot be smoothly caught by the second catching guide 28.

It is also contemplated to have the spun yarn 10 enter the first slit 101 of the yarn guide 93 and enter the second slit 202 of the yarn guide 94. In this case, the spun yarn 10 cannot be cut by the cutters 99 and 100.

it is also contemplated to have the spun yarn 10 enter the second slot 102 of the yarn guide 93 and enter the first slot 201 of the yarn guide 94. In this case, the spun yarn 10 is cut by the cutters 99 and 100 at 2 locations, and the spun yarn 10 between the cut locations remains in the piecing nozzle 92 and interferes with the piecing.

In the yarn splicing device 23 of the present embodiment, the downstream yarn guide 94 and the upstream yarn take-up lever 95 are configured in the following shapes so that the continuous spun yarn 10 can reliably enter both the second slit 102 of the yarn guide 93 and the second slit 202 of the yarn guide 94.

hereinafter, the detailed description will be given with reference to fig. 3. A projection 93a is formed between the two slits 101 and 102 of the yarn guide plate 93. A projection 94a is formed between the two slits 201 and 202 of the yarn guide plate 94. The protrusion 93a is formed with a yarn guide surface 93b that guides the spun yarn 10 to the first slit 101, and a yarn guide surface 93c that guides the spun yarn 10 to the second slit 102. Both the yarn guide surfaces 93b and 93c are formed in a tapered shape. The yarn guide surface 93b is smoothly continuous with the inner wall of the first slit 101. The yarn guide surface 93c is smoothly continuous with the inner wall of the second slit 102. The protruding length of the protruding portion 94a is longer than the protruding length of the protruding portion 93 a. Only a yarn guide surface (first cut guide portion) 94c for guiding the spun yarn 10 to the second slit 202 is formed in the protrusion 94 a. The yarn guide surface 94c is formed in a tapered shape and smoothly continues to the inner wall of the second slit 202.

The yarn levers 95 and 96 are each configured to be curved to one side. A yarn guide portion 95a that is in contact with and guides the spun yarn 10 is formed on the inner peripheral side of the yarn poke bar 95. A yarn guide portion 96a that is in contact with and guides the spun yarn 10 is formed on the inner peripheral side of the yarn lever 96. The yarn puller 95 is formed longer than the yarn puller 96. A V-shaped bent portion (second cut guide portion) 95b is formed in the yarn guide portion 95 a.

The operation of the above configuration will be explained. When the yarn levers 95 and 96 are rotated in the closing direction from the state shown in fig. 3, the upstream yarn lever 95 first comes into contact with the spun yarn 10 in the continuous state. While the yarn pulling bar 95 on the upstream side comes into contact with the spun yarn 10 and approaches the yarn guide plates 93 and 94, the spun yarn 10 to which tension is applied naturally moves toward the bent portion 95 b. The bent portion 95b is disposed at a position substantially corresponding to the second slit 202 in a state immediately before the yarn poking bars 95 and 96 enter between the yarn guide plate 93 and the yarn guide plate 94. Therefore, the spun yarn 10 moving toward the bent portion 95b smoothly enters the second slit 202.

The spun yarn 10 pulled by the yarn pulling levers 95 and 96 first comes into contact with the downstream side protrusion 94 a. The spun yarn 10 is guided to the second slit 102 by the yarn guide surface 94c of the protrusion 94 a.

Since the yarn guide plate 94 and the yarn hooking lever 95 of the yarn splicing device 23 have the above-described shape, when the yarn hooking levers 95 and 96 hook the spun yarn 10 in a continuous state, the yarn 10 is guided so as to enter the second slit 102 formed in the yarn guide plate 93 and the second slit 202 formed in the yarn guide plate 94. Therefore, the spun yarn 10 can be reliably clamped by the clamping portion 98 and cut by the cutter 100.

as described above, the spinning unit 2 included in the spinning machine of the present embodiment includes the yarn feeding unit 5, the winding device 26, the yarn splicing device 23, and the yarn splicing monitoring device 25. The yarn feeding section 5 feeds the spun yarn 10. The winding device 26 winds the spun yarn 10 into a package 50. The joint device 23 has a cutter 100. The yarn joint monitoring device 25 monitors the spun yarn 10. The spinning machine (spinning unit 2) cuts the spun yarn 10 in a continuous state by the cutter 100 of the yarn splicing device 23 based on the monitoring result of the yarn splicing monitoring device 25.

Accordingly, the spun yarn 10 can be cut by the cutter 100 of the yarn splicing device 23 without providing a cutter in particular. Therefore, the spun yarn 10 can be cut with a simple configuration based on the monitoring result of the yarn splicing monitoring device 25.

In the spinning machine of the present embodiment, the yarn splicing monitoring device 25 is disposed downstream of the yarn splicing device 23. The spinning machine cuts the spun yarn 10 by the cutter 100 based on the monitoring result of the yarn splicing of the spun yarn 10 by the yarn splicing monitoring device 25.

Accordingly, the yarn 10 can be fed downstream by winding the yarn in the yarn splicing device 23 by the winding device 26, and whether the yarn splicing is satisfactory or not can be immediately determined by the yarn splicing monitoring device 25. Therefore, when the formed joint is good, the winding can be continued as it is. Even if the splice is defective, the splice defect can be detected at the initial stage of the acceleration of the winding speed of the winding device 26, and the winding can be stopped in a short time. As a result, when the joint is performed again, the joint can be efficiently performed.

In the spinning machine of the present embodiment, when the yarn splicing monitoring device 25 detects that there is a defective yarn splicing in the spun yarn 10, the winding of the winding device 26 is stopped, and then the spun yarn 10 is cut by the cutter 100.

Thus, the cut yarn end is not wound around the package 50 rotating (due to inertia) in the winding device 26. Therefore, when the yarn end is pieced again, the yarn end can be reliably caught.

In the spinning machine of the present embodiment, the yarn splicing device 23 includes a nip portion 98 that holds the spun yarn 10. In a state where the spun yarn 10 is held by the nip 98, the spun yarn 10 is cut by the cutter 100 based on the monitoring result of the yarn splicing monitoring device 25.

This can prevent the yarn end formed by cutting the spun yarn 10 from being disturbed by sudden release of the tension of the spun yarn 10 and/or twisting of the spun yarn 10.

In the spinning machine of the present embodiment, the portion of the yarn 10 held by the nip portion 98 of the yarn splicing device 23 is located downstream of the cutting portion of the cutter 100 that cuts the yarn 10.

Thus, the second yarn, which is the downstream side yarn end (package 50 side) of the yarn ends formed by cutting the spun yarn 10, can be held by the nip portion 98. Therefore, the yarn end of the second yarn connected to the package 50 can be prevented from being entangled, and therefore, when the yarn end is again spliced, the yarn end can be efficiently spliced.

the spinning machine of the present embodiment includes a second catching guide 28 that catches the spun yarn 10 from the package 50. After the second catching guide 28 moves to a position where the spun yarn 10 held by the nip 98 can be caught, the nip 98 releases the holding of the spun yarn 10.

Accordingly, the second yarn is held by the clamping portion 98 and is delivered to the second catching guide 28 so that the yarn end (second yarn) from the package 50 does not move, and therefore the second catching guide 28 can catch the spun yarn 10 very easily. Therefore, the spun yarn 10 can be smoothly captured, and the efficiency of the yarn splicing operation can be further improved.

In the spinning machine of the present embodiment, the yarn splicing device 23 includes yarn guide plates 93 and 94 and yarn levers 95 and 96. The yarn guide plate 93 has a first slit 101 into which the yarn end of the first yarn from the yarn supply unit 5 is introduced for yarn splicing and a second slit 102 into which the yarn end of the second yarn from the package 50 is introduced for yarn splicing. The yarn guide plate 94 is provided with a first slit 201 into which a yarn end of a first yarn is introduced for yarn splicing and a second slit 202 into which a yarn end of a second yarn is introduced for yarn splicing. In order to perform the yarn splicing, the yarn-dialing levers 95 and 96 perform a yarn-dialing operation of dialing the yarn end of the first yarn to the back side of the first slits 101 and 201 and dialing the yarn end of the second yarn to the back side of the second slits 102 and 202. The downstream yarn guide plate 94 includes a yarn guide surface 94c, and when the yarn pulling operation is performed by the yarn pulling levers 95 and 96 in order to cut the spun yarn 10 in a continuous state, the yarn guide surface 94c guides the spun yarn 10 to the second slit 202.

Thus, the spun yarn 10 in the continuous state reliably enters the second slit 202, which is a slit for cutting, through the yarn guide surface 94c of the yarn guide plate 94. As a result, the spun yarn 10 can be reliably cut by the cutter 100 of the yarn splicing device 23.

In the spinning machine of the present embodiment, the yarn poking bar 95 on the upstream side includes the bent portion 95b, and when the yarn poking operation is performed by the yarn poking bar 95(96) in order to cut the continuous spun yarn 10, the bent portion 95b guides the spun yarn 10 to the second slit 102.

Thus, the spun yarn 10 in the continuous state reliably enters the second slit 102, which is a slit for cutting, through the bent portion 95b of the yarn hooking lever 95. As a result, the spun yarn 10 can be reliably cut by the cutter 100 of the yarn splicing device 23.

The spinning machine of the present embodiment includes a control unit 80. The control section 80 controls the yarn splicing device 23 to cut the spun yarn 10 in a continuous state based on the monitoring result of the yarn splicing monitoring device 25.

Accordingly, the spun yarn 10 can be automatically cut by the cutter 100 of the yarn splicing device 23 based on the monitoring result of the yarn splicing monitoring device 25.

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

instead of providing the yarn splicing device 23 and the yarn splicing monitoring device 25 for each spinning unit 2, a movable work carriage may be provided for the plurality of spinning units 2, and the work carriage may perform yarn splicing work and yarn splicing monitoring.

The catching may be assisted by an appropriate assisting device when the first catching guide device 27 catches the first yarn and when the second catching guide device 28 catches the second yarn. For example, the yarn end may be blown to the front end of the first catching guide 27 and/or the front end of the second catching guide 28 by injecting compressed air from an appropriate place. In this case, the catching success rate of the first yarn and the second yarn can be improved. Further, a yarn guide or the like for regulating the position of the spun yarn 10 may be further provided. In this case, the yarn end conveyed while riding on the blown air flow can be stably delivered to the first catching guide 27 and/or the second catching guide 28.

It is also possible to detect that the package 50 has rotated several times from when the joint monitoring device 25 detects a failure of the joint to when the package 50 stops, and control the rotation amount by which the package 50 is inverted before the joint operation based on the detection result. That is, the amount of rotation of the package 50 before the stop of the rotation differs depending on the amount of the spun yarn 10 wound around the package 50 at the time when the yarn splicing failure is detected and/or the rotational speed of the package 50 at that time. Therefore, the control section 80 may calculate the rotation amount of the package 50 until the stop by an appropriate rotation detecting section provided in the winding device 26, and control the reverse rotation amount of the package 50 based on the obtained rotation amount. The rotation detecting unit may be, for example, a rotation sensor configured to generate a pulse signal every time the package 50 rotates by a predetermined angle. This makes it possible to reverse the package 50 by the minimum rotation amount that can be removed by pulling out the defective joint according to the situation. As a result, the package 50 is not wastefully inverted, waste of the spun yarn 10 can be reduced, and the work efficiency can be improved.

In the above embodiment, the yarn splicing monitoring device 25 that monitors the splicing of the spun yarn 10 is provided separately from the yarn quality monitoring device 40 that monitors the quality of the spun yarn 10. However, both the yarn splicing of the spun yarn 10 and the quality of the spun yarn 10 may be monitored by one yarn monitoring device.

The configuration for guiding the spun yarn 10 in the continuous state to the second slits 102 and 202 is not limited to the yarn guide surface 94c and the curved portion 95 b. For example, the yarn guide plate 93 on the upstream side may be provided with a large yarn guide surface 94c for guiding the spun yarn 10 to the second slits 102 and 202. The downstream yarn-dialing bar 96 may be provided with a bending portion similar to that of the upstream yarn-dialing bar 95.

The spun yarn 10 in a continuous state may be guided to the first slits 101 and 201 without being guided to the second slits 102 and 202, and the spun yarn 10 may be cut by the cutter 99. In this case, the second yarn cannot be held, but the first yarn can be held by the nip portion 97.

In the above embodiment, the control is performed such that the spun yarn 10 is cut by the cutter 100 of the yarn splicing device 23 in response to detection of a defective yarn splicing, and after the second yarn is held by the nip 98, the second catching guide device 28 is temporarily stopped at the position indicated by the solid line in fig. 9, and the nipping by the nip 98 is released in this state. However, it is not always necessary to stop the second yarn once as long as the second yarn can be reliably caught by the second catching guide 28.

In the above embodiment, the winding drum motor 116 for driving the winding drum 53 of the winding device 26 is provided for each spinning unit 2. However, instead of this, the winding drum 53 may be configured to be driven by a common drive shaft in the plurality of spinning units 2. In this case, it is preferable to provide a package driving mechanism different from the winding drum 53 so that the package 50 can be rotated at a lower acceleration than usual after the completion of the piecing or the package 50 can be inverted as described above.

The spinning machine of the above embodiment is a layout in which the package 50 is arranged above the spinning unit 2. However, the present invention is not limited to this, and the present invention can be applied to a spinning machine in which the package 50 is disposed below the spinning unit 2 (for example, a spinning machine disclosed in japanese patent application laid-open No. 2010-77576). In addition, the present invention can also be applied to an automatic winder that winds a yarn unwound from a yarn feeding bobbin to form a package, and in this case, the bobbin installation section where the yarn feeding bobbin can be installed corresponds to the yarn feeding section.

Claims (12)

1. A yarn winding machine is characterized by comprising:

A yarn supply unit for supplying a yarn;

A winding device for winding the yarn into a package;

A yarn splicing device having a yarn poking rod, a yarn guide member and a cutter attached to the yarn guide member;

A yarn monitoring device for monitoring the yarn; and

A control section for performing control so that the yarn in a continuous state is cut by the yarn splicing device, based on a monitoring result of the yarn monitoring device,

Cutting the yarn by the cutter after stopping the winding by the winding device when the yarn monitoring device detects that the yarn splice is defective,

The yarn guide member is provided with:

A first slit into which a first yarn end, which is a yarn end of the yarn from the yarn feeding unit, is introduced for yarn splicing; and

a second slit into which a second yarn end, which is a yarn end of the yarn from the package, is introduced for yarn splicing,

In order to perform the yarn splicing, the yarn poking rod performs a yarn poking action of poking the first yarn head to the first slit and poking the second yarn head to the second slit.

2. The yarn winding machine as claimed in claim 1,

The yarn monitoring device is disposed downstream of the yarn splicing device in a traveling direction of the yarn during winding of the package,

The yarn is cut by the cutter based on the monitoring result of the yarn monitoring device.

3. The yarn winding machine as claimed in claim 1,

The yarn splicing device has a holding portion for holding the yarn,

The yarn cutting device cuts the yarn in accordance with the monitoring result of the yarn monitoring device while the holding portion holds the yarn.

4. The yarn winding machine as claimed in claim 2,

the yarn splicing device has a holding portion for holding the yarn,

The yarn cutting device cuts the yarn in accordance with the monitoring result of the yarn monitoring device while the holding portion holds the yarn.

5. The yarn winding machine as claimed in claim 3,

The holding portion holds the yarn at a position downstream of a cutting position at which the cutter cuts the yarn in a traveling direction of the yarn during winding of the package.

6. The yarn winding machine as claimed in claim 4,

the holding portion holds the yarn at a position downstream of a cutting position at which the cutter cuts the yarn in a traveling direction of the yarn during winding of the package.

7. The yarn winding machine as claimed in claim 5,

A yarn catching section for catching the yarn from the package,

The holding portion releases the holding of the yarn after the yarn catching portion moves to a position where the yarn held by the holding portion can be caught.

8. The yarn winding machine as claimed in claim 6,

A yarn catching section for catching the yarn from the package,

The holding portion releases the holding of the yarn after the yarn catching portion moves to a position where the yarn held by the holding portion can be caught.

9. The yarn winding machine as claimed in any one of claims 1 to 8,

in order to perform the yarn splicing, the yarn poking rod pokes the first yarn head to the back side of the first slit and pokes the second yarn head to the back side of the second slit,

the yarn guide member includes a first cutting guide portion that guides the yarn to one of the first slit and the second slit when the yarn pulling operation is performed by the yarn pulling lever in order to cut the yarn in a continuous state.

10. The yarn winding machine as claimed in any one of claims 1 to 8,

In order to perform the yarn splicing, the yarn poking rod pokes the first yarn head to the back side of the first slit and pokes the second yarn head to the back side of the second slit,

The yarn poking bar includes a second cutting guide portion that guides the yarn toward one of the first slit and the second slit when the yarn poking operation is performed by the yarn poking bar in order to cut the yarn in a continuous state.

11. The yarn winding machine as claimed in claim 9,

in order to perform the yarn splicing, the yarn poking rod pokes the first yarn head to the back side of the first slit and pokes the second yarn head to the back side of the second slit,

The yarn poking bar includes a second cutting guide portion that guides the yarn toward one of the first slit and the second slit when the yarn poking operation is performed by the yarn poking bar in order to cut the yarn in a continuous state.

12. a yarn winding method is a yarn winding method in a yarn winding machine,

the yarn winding machine comprises:

A yarn supply unit for supplying a yarn;

A winding device for winding the yarn into a package;

A yarn splicing device having a yarn poking rod, a yarn guide member, and a cutter attached to the yarn guide member, and capable of splicing the yarns;

A yarn monitoring device for monitoring the yarn; and

A control section for performing control so that the yarn in a continuous state is cut by the yarn splicing device, based on a monitoring result of the yarn monitoring device,

The yarn guide member is provided with:

a first slit into which a first yarn end, which is a yarn end of the yarn from the yarn feeding unit, is introduced for yarn splicing; and

A second slit into which a second yarn end, which is a yarn end of the yarn from the package, is introduced for yarn splicing,

in the above-described yarn winding method,

Cutting the yarn by the cutter after stopping the winding by the winding device when the yarn monitoring device detects that the yarn splice is defective,

In order to perform the yarn splicing, the yarn poking rod performs a yarn poking action of poking the first yarn head to the first slit and poking the second yarn head to the second slit.