JP2019167645A - Pot fine spinning frame - Google Patents

Abstract

To provide a pot fine spinning frame capable of inhibiting yarns from being wound around a yarn guide tube to prevent the part from being damaged without using a bobbin and a locking means of a special structure.SOLUTION: The present invention relates to a pot fine spinning frame including a draft device 10 for stretching a yarn, a yarn sucking tube 12 for sucking a stretched yarn 18, a cylindrical pot 15, and a yarn guide tube 14 for guiding the yarn fed through the yarn sucking tube 12 into the pot 15 to wind the yarn 18 discharged from the yarn guide tube 14 on an inner wall 27 of the pot 15 to form a cake 24, and the spinning frame further includes a detection sensor 11 for detecting behavior of the yarn in a yarn path from the draft device 10 through the yarn sucking tube 12, a cutting mechanism 13 for cutting the yarn 18 in the middle of a yarn path from the draft device 10, the yarn sucking tube 12, the yarn guide tube 14 to the inner wall 27 of the pot 15, and a control part 50 for controlling the cutting mechanism 13 so as to drive it when it is determined based on the detection result of the detection sensor 11 that the behavior of the yarn is abnormal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pot spinning machine.

  As one of spinning machines, a pot spinning machine using a cylindrical pot is known. In the pot spinning machine, the pot is rotated at a predetermined number of revolutions, and the yarn stretched to a predetermined fineness is guided into the pot through a yarn introduction tube, whereby the yarn is wound around the inner wall of the pot to form a cake. When the formation of the cake is completed, the yarn is cut upstream from the yarn introduction tube, and then the bobbin is inserted into the pot, and the yarn is wound back from the inner wall of the pot to the bobbin.

  In the pot spinning machine, the yarn may be wound around the yarn introduction tube during the formation of the cake. If the yarn is wound around the yarn introduction tube, the yarn wrapped around the yarn introduction tube may come into contact with the pot when the yarn introduction tube is moved to avoid contact between the yarn introduction tube and the bobbin. Further, when the yarn wound around the yarn introduction tube comes into contact with the pot, there is a risk of causing damage to the parts such as bending of the yarn introduction tube.

  Here, Patent Document 1 describes a technique related to a pot spinning machine. In the technique described in Patent Document 1, a cylindrical bobbin is disposed on the outer side of the yarn introduction tube coaxially with the yarn introduction tube, and a notch is formed at one end of the bobbin. When the yarn breakage is detected during the formation of the cake, the bobbin is dropped and the yarn is hooked on the notch portion of the bobbin to start the rewinding to the bobbin.

JP-A-8-325854

However, the technique described in Patent Document 1 requires a specially structured bobbin and a complicated drive mechanism.
Specifically, the bobbin used in the technique described in Patent Document 1 has a special structure in which one end of the bobbin is widely formed in a skirt shape and a notch is formed therein. Further, in the technique described in Patent Document 1, a flange portion is formed on the upper portion of the bobbin, and the locking means is locked to the flange portion, and the locking means is driven when the yarn breakage is detected. ing.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to suppress the winding of the yarn around the yarn introduction pipe without using a specially structured bobbin or locking means, and to damage the parts. The object is to provide a pot spinning machine that can be avoided.

  The present invention comprises a suction tube for sucking a yarn supplied from a draft device, a cylindrical pot, and a yarn guide tube for guiding the yarn supplied through the suction tube into the pot. A pot spinning machine that forms a cake by winding a yarn discharged from a pipe around an inner wall of the pot, a detection sensor for detecting a behavior of the yarn in a yarn path from the draft device to the suction tube, and the draft device The yarn behavior is abnormal based on the cutting mechanism that cuts the yarn in the middle of the yarn path from the suction tube and the yarn introduction tube to the inner wall of the pot, and the detection result of the detection sensor. A control unit that controls to drive the cutting mechanism.

  In the pot spinning machine according to the present invention, the detection sensor may detect ballooning of the yarn sucked into the suction tube as the behavior of the yarn.

  According to the present invention, it is possible to suppress the winding of the yarn around the yarn introduction tube without using a bobbin having a special structure or the locking means, and to avoid breakage of parts.

It is the schematic which shows the structural example of the pot spinning machine which concerns on embodiment of this invention. It is a schematic side view which shows the structural example of the cutting mechanism with which the pot spinning machine which concerns on embodiment of this invention is provided. It is a block diagram which shows the structural example of the drive control system of the pot spinning machine which concerns on embodiment of this invention. It is a figure which shows the basic flow of a pot spinning method. It is a schematic plan view showing the arrangement of detection sensors and the state of yarn ballooning. It is a figure which shows the output signal of a detection sensor when the yarn is ballooning. It is a schematic side view explaining operation | movement of the pot spinning machine in a rewinding step. It is a figure explaining the winding of the thread | yarn around a yarn introduction pipe | tube. It is a figure explaining the malfunction which may occur by winding of the thread | yarn around a yarn introduction pipe | tube. It is a figure explaining a roller winding up phenomenon. It is a figure explaining a yarn jam phenomenon. It is a figure explaining the behavior of a thread when a roller winding phenomenon occurs. It is a figure which shows the output signal of a detection sensor when the behavior of a thread | yarn becomes abnormal by the roller winding-up phenomenon. It is a figure explaining the behavior of the yarn when the yarn jam phenomenon occurs. It is a figure which shows the output signal of a detection sensor when the behavior of a yarn becomes abnormal due to the yarn jam phenomenon. It is the schematic which shows the structural example of the pot spinning machine which concerns on other embodiment of this invention. FIG. 17 is a schematic side view for explaining the operation when the cutting mechanism shown in FIG. 16 is driven.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Pot spinning machine>
FIG. 1 is a schematic view showing a configuration example of a pot spinning machine according to an embodiment of the present invention.
As shown in FIG. 1, the pot spinning machine 1 includes a draft device 10, a detection sensor 11, a suction tube 12, a cutting mechanism 13, a yarn introduction tube 14, a pot 15, a bobbin support portion 16, It has. These components constitute one spindle that is a unit of spinning. The pot spinning machine 1 includes a plurality of spindles. Here, the configuration of one of the spindles will be described.

(Draft device)
The draft device 10 is a device that stretches a yarn material such as a roving yarn. The draft device 10 includes a plurality of roller pairs including a back roller pair 21, a middle roller pair 22, and a front roller pair 23. The plurality of roller pairs are arranged in the order of the back roller pair 21, the middle roller pair 22, and the front roller pair 23 from the upstream side to the downstream side in the yarn feeding direction.

  Each of the roller pairs 21, 22, and 23 rotates in accordance with the driving of a draft driving unit described later. Comparing the rotation speed (rpm) of each roller pair 21, 22, 23 per unit time, the rotation speed of the middle roller pair 22 is higher than the rotation speed of the back roller pair 21, and the rotation speed of the front roller pair 23 is It is higher than the rotation speed of the middle roller pair 22. Thus, the rotational speeds of the respective roller pairs 21, 22, and 23 are different from each other, and the draft device 10 draws the yarn material thinly by utilizing the difference in rotational speed, that is, the rotational speed difference.

(Detection sensor)
The detection sensor 11 is a sensor that detects the behavior of the yarn in the yarn path from the draft device 10 to the suction tube 12. The detection sensor 11 is disposed downstream of the draft device 10 and upstream of the suction tube 12 in the yarn feeding direction. In the present embodiment, as an example, the detection sensor 11 is a sensor that detects the ballooning of the yarn sucked into the suction tube 12 as the behavior of the yarn. Yarn ballooning refers to a phenomenon in which the yarn turns by the rotation of the pot 15 and thereby the yarn forms a balloon.

  Yarn ballooning occurs downstream of the draft device 10 and upstream of the yarn discharge port 14 b of the yarn introduction tube 14. Specifically, yarn ballooning is performed between the draft device 10 and the suction tube 12, inside the suction tube 12, between the suction tube 12 and the yarn introduction tube 14, or the yarn introduction tube 14. Occurs inside. In particular, between the draft device 10 and the suction tube 12, the yarn is ballooned so as to turn around the central axis of the suction tube 12. A state in which the yarn is ballooned on the upstream side of the suction tube 12 is a normal state as a behavior of the yarn.

  The detection sensor 11 is configured using, for example, an optical sensor that combines a light emitter 11a and a light receiver 11b. In the present embodiment, the light emitter 11a is composed of a light emitting diode and the light receiver 11b is composed of a photodiode, and the detection sensor 11 has a larger amount of light received when the light receiver 11b receives light emitted from the light emitter 11a. A high voltage or current signal, that is, a Hi level signal is output.

(Absorbing tube)
The suction tube 12 sucks the yarn 18 supplied from the draft device 10 and sends the sucked yarn to the yarn introduction tube 14. The suction tube 12 sucks the yarn 18 stretched by the draft device 10 into the suction tube 12 using a swirling flow of air.

(Cutting mechanism)
The cutting mechanism 13 cuts the yarn 18 in the middle of the yarn path from the draft device 10 to the inner wall 27 of the pot 15 through the suction tube 12 and the yarn introduction tube 14 in this order. In this embodiment, as an example, the cutting mechanism 13 is disposed between the suction tube 12 and the yarn introduction tube 14 in the yarn feeding direction.

The cutting mechanism 13 is constituted by, for example, an electric cutter, and a specific configuration example in that case is shown in FIG.
As illustrated, the cutting mechanism 13 includes a cutting blade 131, an actuator unit 132, and a blade receiving unit 133. The cutting blade 131 has a sharp blade edge 131a. The actuator unit 132 quickly moves the cutting blade 131 in the A direction. The actuator unit 132 is configured using, for example, a solenoid. The blade receiving portion 133 is a portion that receives the blade edge 131a when the cutting blade 131 is moved by the operation of the actuator portion 132. The cutting edge 131a of the cutting blade 131 is disposed so as to face the blade receiving portion 133 with the yarn path J interposed therebetween.

  In the cutting mechanism 13 having the above configuration, when the actuator unit 132 is operated, first, the cutting blade 131 moves in a direction approaching the blade receiving unit 133, and the cutting edge 131 a hits the blade receiving unit 133 by this movement. Thereby, the yarn existing in the yarn path J can be cut by the cutting blade 131. Thereafter, the cutting blade 131 moves in a direction away from the blade receiving portion 133. In the present embodiment, since the cutting blade 131 is disposed in the middle of the yarn path from the suction tube 12 to the yarn introduction tube 14, the yarn is cut between the suction tube 12 and the yarn introduction tube 14. . However, the yarn cutting position by the cutting mechanism 13 may be set between the front roller pair 23 and the suction tube 12.

(Yarn guide tube)
Returning to FIG. 1, the yarn introduction tube 14 guides the yarn 18 conveyed from the draft device 10 via the suction tube 12 into the pot 15. The yarn introduction tube 14 is formed in an elongated tubular shape. The shape when the yarn introduction tube 14 is cross-sectioned in a direction orthogonal to the length direction is circular. The yarn introduction tube 14 is disposed coaxially with the suction tube 12 and the pot 15 on the downstream side of the draft device 10. The yarn introduction tube 14 passes through the upper portion of the pot 15 and is inserted into the pot 15. The upper end portion of the yarn introduction tube 14 is opened as a yarn introduction port 14a, and the lower end portion thereof is opened as a yarn discharge port 14b. The yarn 18 introduced from the yarn introduction port 14 a of the yarn introduction tube 14 is discharged from the yarn discharge port 14 b of the yarn introduction tube 14.

(pot)
The pot 15 is used for forming the cake 24 and winding the yarn. The pot 15 is formed in a cylindrical shape. The pot 15 is rotatably provided around the center axis of the pot 15. The center axis K of the pot 15 is arranged in parallel with the vertical direction. For this reason, one of the pots 15 in the central axis direction is upward and the other is downward. A yarn introduction tube insertion port 25 is formed on the upper end side of the pot 15. The yarn introduction tube insertion port 25 is an opening for inserting the yarn introduction tube 14 into the pot 15. An opening 26 is formed at the lower end of the pot 15. The opening 26 opens downward with the same diameter as the pot inner diameter.

(Bobbin support)
The bobbin support portion 16 supports the bobbin 30. The bobbin support part 16 includes a bobbin pedestal 31 and a bobbin mounting part 32. The bobbin pedestal 31 is formed in a plate shape. The bobbin mounting portion 32 is fixed to the bobbin pedestal 31. The bobbin mounting portion 32 is formed in a column shape and is disposed so as to protrude upward from the upper surface of the bobbin pedestal 31.

  The bobbin mounting portion 32 is a portion where the bobbin 30 is detachably mounted. The bobbin mounting portion 32 is disposed coaxially with the yarn introduction tube 14 and the pot 15 so as to face the yarn introduction tube 14 in the central axis direction of the pot 15. Further, the bobbin mounting portion 32 is disposed below the yarn introduction tube 14. For this reason, when the bobbin 30 is mounted on the bobbin mounting portion 32, the bobbin 30 is disposed so as to face the yarn introduction tube 14 on the central axis K of the pot 15.

  The bobbin 30 has a tapered structure in which the bobbin outer diameter continuously changes from one end side to the other end side in the bobbin central axis direction. The bobbin 30 corresponds to a general-purpose bobbin that is also used in ring spinning. The bobbin 30 has a hollow structure at least on one end side. The bobbin 30 is supported upright from the bobbin pedestal 31 by fitting a hollow part on one end side to the bobbin mounting part 32. The outer diameter of the bobbin 30 is set smaller than the minimum diameter of the cake 24 formed on the inner wall 27 of the pot 15. Thereby, when the bobbin 30 is inserted and arranged in the pot 15 through the opening 26 of the pot 15, contact between the bobbin 30 and the cake 24 can be avoided.

  Further, a thread loosening member 33 is attached to the bobbin pedestal 31. The yarn unraveling member 33 loosens the yarn that is the starting point of rewinding from the cake 24 by contacting the end 24b on the winding end side of the cake 24. The cake 24 is a laminated body of yarns formed on the inner wall 27 of the pot 15 by the operation of the yarn introduction tube 14 and the pot 15 described later.

FIG. 3 is a block diagram showing a configuration example of a drive control system of the pot spinning machine according to the embodiment of the present invention.
As shown in FIG. 3, the pot spinning machine 1 includes a control unit 50, a draft driving unit 51, a cutter driving unit 52, a yarn introduction tube driving unit 53, a pot driving unit 54, a bobbin driving unit 55, It has.

(Control part)
The control unit 50 controls the overall operation of the pot spinning machine 1. A draft drive unit 51, a cutter drive unit 52, a yarn introduction tube drive unit 53, a pot drive unit 54, and a bobbin drive unit 55 are electrically connected to the control unit 50 as objects of operation control. Further, the detection sensor 11 is electrically connected to the control unit 50.

(Draft drive)
The draft driving unit 51 rotates the back roller pair 21, the middle roller pair 22, and the front roller pair 23 at a predetermined number of rotations. The draft driving unit 51 rotates based on the draft driving signal given from the control unit 50 to the draft driving unit 51 to rotate the back roller pair 21, the middle roller pair 22, and the front roller pair 23.

(Cutter drive unit)
The cutter driving unit 52 operates the actuator unit 132 to move the cutting blade 131 in the A direction. The cutter driving unit 52 moves the cutting blade 131 by driving based on a cutter driving signal given from the control unit 50 to the cutter driving unit 52.

(Yarn guide tube drive)
The yarn introduction tube driving unit 53 moves the yarn introduction tube 14 in the vertical direction. The yarn introduction tube driving unit 53 moves the yarn introduction tube 14 in the vertical direction by driving based on a yarn introduction tube drive signal given to the yarn introduction tube driving unit 53 from the control unit 50.

(Pot drive unit)
The pot driving unit 54 rotates the pot 15. The pot driving unit 54 rotates based on the center axis K of the pot 15 as a rotation center by driving based on a pot driving signal given from the control unit 50.

(Bobbin drive)
The bobbin driving unit 55 moves the bobbin 30 in the vertical direction. The bobbin driving unit 55 moves the bobbin pedestal 31 in the vertical direction by driving based on the bobbin driving signal given from the control unit 50. When the bobbin 30 is mounted on the bobbin mounting portion 32 and the bobbin pedestal 31 is moved in the vertical direction, the bobbin 30 and the thread loosening member 33 move in the vertical direction integrally with the bobbin pedestal 31.

<Pot spinning method>
FIG. 4 is a diagram showing a basic flow of the pot spinning method.
As shown in FIG. 4, the pot spinning method has a stretching step S1, a cake forming step S2, and a rewinding step S3.

  The drawing step S1 is a step of drawing a yarn material such as a roving yarn. The cake forming step S2 is a step of forming the cake 24 by winding the yarn stretched in the stretching step S1 around the inner wall 27 of the pot 15. The rewinding step S3 is a step of rewinding the yarn forming the cake 24 around the bobbin 30. Hereinafter, the operation of the pot spinning machine 1 based on each step will be described.

(Stretching step)
The stretching step S <b> 1 is performed using the draft device 10. The draft driving unit 51 is driven based on a draft driving signal given from the control unit 50, thereby rotating the back roller pair 21, the middle roller pair 22, and the front roller pair 23 at a predetermined rotational speed. Thereby, the yarn material such as the coarse yarn is conveyed according to the rotation of the respective roller pairs 21, 22 and 23.

  At that time, the control unit 50 sets the rotation speed of the back roller pair 21 to be lower than the rotation speed of the middle roller pair 22 and sets the rotation speed of the middle roller pair 22 to be lower than the rotation speed of the front roller pair 23. Set. Thus, the yarn is stretched between the back roller pair 21 and the middle roller pair 22 due to the difference in rotational speed between the roller pairs. Similarly, the yarn is stretched between the middle roller pair 22 and the front roller pair 23 due to the difference in rotational speed between the pair of rollers.

  As a result, the yarn material such as the coarse yarn is stretched to a predetermined fineness while sequentially passing through the back roller pair 21, the middle roller pair 22, and the front roller pair 23. The yarn 18 thus stretched is then sucked into the suction tube 12 using a swirling flow of air or the like and then introduced into the yarn guide tube 14 from the yarn introduction port 14a.

  Further, the pot driving unit 54 drives the pot 15 at a predetermined number of rotations by driving based on a pot driving signal given from the control unit 50 prior to the start of the stretching step S1.

(Cake formation step)
The cake forming step S <b> 2 is performed using the yarn introduction tube 14 and the pot 15. The yarn introduction tube driving unit 53 is driven based on the yarn introduction tube drive signal given from the control unit 50 to move the yarn introduction tube 14 away from the suction tube 12, that is, downward by a predetermined amount. Further, the pot driving unit 54 continues to rotate the pot 15 by driving based on the pot driving signal given from the control unit 50.

  The yarn 18 introduced from the suction tube 12 to the yarn introduction tube 14 is discharged from the yarn discharge port 14b of the yarn introduction tube 14. Further, the yarn 18 fed out by the front roller pair 23 balloons according to the rotation of the pot 15 on the upstream side of the suction tube 12. This is shown in FIG. FIG. 5 shows the suction tube 12 as viewed from above. As illustrated, on the upstream side of the suction tube 12, the yarn 18 is ballooned so as to turn around the central axis of the suction tube 12. At this time, the thread 18 periodically crosses the sensor optical axis H of the detection sensor 11 including the light emitter 11a and the light receiver 11b. For this reason, the output signal of the detection sensor 11 is a pulse signal reflecting the ballooning of the yarn 18, as shown in FIG. Specifically, the detection sensor 11 outputs a pulse signal that becomes Hi level when the yarn 18 deviates from the sensor optical axis H and becomes Low level when the yarn 18 blocks the sensor optical axis H. ing.

  The intensity of light emitted from the light emitter 11a of the detection sensor 11 is strongest on the sensor optical axis H that is the center of the optical path diameter. For this reason, when the diameter of the yarn 18 is smaller than the optical path diameter of the detection sensor 11, the signal output from the light receiver 11b when the yarn 18 is ballooning has a waveform. However, in this embodiment, in order to facilitate understanding of the content of the invention, a signal output from the detection sensor 11 when the yarn 18 is ballooning is a rectangular pulse signal. This pulse signal is obtained, for example, by converting a waveform signal output from the light receiver 11b into a rectangular signal by comparing with a preset threshold value.

  In the cake forming step S2, a centrifugal force due to the rotation of the pot 15 acts on the yarn 18 discharged from the yarn discharge port 14b of the yarn introduction tube 14, and the yarn 18 is pressed against the inner wall 27 of the pot 15 by this centrifugal force. Further, the yarn 18 discharged from the yarn discharge port 14 b of the yarn introduction tube 14 is wound around the inner wall 27 of the pot 15 in a state where twist is applied by the rotation of the pot 15.

  Further, in the cake forming step S2, the yarn introduction tube driving section 53 is driven based on the yarn introduction tube drive signal, whereby the yarn introduction tube 14 is repeatedly reciprocated in the vertical direction at a predetermined cycle, while the yarn introduction tube 14 is driven. The position of the tube 14 is displaced relatively downward. As a result, the yarn 18 is wound around the inner wall 27 of the pot 15, and the yarn 18 is stacked while shifting the winding position, thereby forming the cake 24. The formation of the cake 24 is completed when the thread trimming is performed. Thread trimming is performed under the control of the control unit 50. Specifically, the control unit 50 controls the driving of the draft driving unit 51 so as to stop the rotation of the back roller pair 21 and the middle roller pair 22 while continuing the rotation of the front roller pair 23. Then, the yarn 18 is forcibly cut on the downstream side of the middle roller pair 22.

  Here, the difference between “thread cutting” and “thread cutting” will be described. The thread trimming is intentionally performed by the control unit 50 when the predetermined amount of the thread 18 is wound around the inner wall 27 of the pot 15, that is, when the formation of the cake 24 is finished. The yarn breakage is a phenomenon in which the yarn 18 is broken for some reason before the predetermined amount of the yarn 18 is wound around the inner wall 27 of the pot 15, that is, while the cake 24 is being formed.

(Rewind step)
The rewinding step S3 is performed using the pot 15, the bobbin 30, and the thread loosening member 33. In the rewinding step S <b> 3, as shown in FIG. 7, the yarn introduction tube 14 is moved upward by driving the yarn introduction tube driving unit 53, and the rotation of the pot 15 is continued by driving the pot driving unit 54. In the rewinding step S <b> 3, the bobbin 30 and the yarn loosening member 33 are arranged in the pot 15 through the opening 26 by driving the bobbin driving unit 55. At this time, the control unit 50 adjusts the drive timing of the yarn introduction tube drive unit 53 and the bobbin drive unit 55 so that the bobbin 30 does not contact the yarn introduction tube 14.

  Further, the bobbin driving unit 55 moves the bobbin pedestal 31 upward. As a result, the bobbin 30 attached to the bobbin attachment part 32 and the thread loosening member 33 attached to the bobbin base 31 both move upward. At that time, the upper end portion of the yarn loosening member 33 comes into contact with the end portion 24 b on the winding end side of the cake 24. Then, at the place where the yarn loosening member 33 comes into contact, the yarn forming the cake 24 is loosened, and the loosened yarn is separated from the inner wall 27 of the pot 15 and is wound around the bobbin 30. As a result, the winding of the yarn from the pot 15 to the bobbin 30 is started using the loosened yarn as the starting point of rewinding.

  After that, when all the yarns forming the cake 24 are wound back onto the bobbin 30, the control unit 50 moves the bobbin base 31 downward by driving the bobbin driving unit 55. Thereby, both the bobbin 30 and the thread loosening member 33 move downward, and the rewinding step S3 is completed. After that, after the bobbin 30 that has been wound up is removed from the bobbin mounting portion 32 and the empty bobbin 30 is mounted on the bobbin mounting portion 32, the same operation as described above is performed.

<About winding the yarn around the yarn introduction tube>
Next, the winding of the yarn around the yarn introduction tube that may occur during the formation of the cake will be described.
First, when the yarn 18 comes into contact with the outer peripheral surface of the yarn introduction tube 14 for some reason during the formation of the cake 24, the yarn 18 may start to be wound around the yarn introduction tube 14. Then, as shown in FIG. 8, the yarn 18 that has previously formed the cake 24 is wound around the yarn introduction tube 14 by the rotation of the pot 15. For this reason, when the yarn introduction tube 14 is retracted upward in the rewinding step S3, as shown in FIG. 9, the yarn 18 wound around the yarn introduction tube 14 comes into contact with the pot 15, and thereby the yarn introduction tube 14 is bent. There is a risk of damaging parts such as.

  The winding of the yarn 18 around the yarn introduction tube 14 is likely to occur when a roller winding phenomenon or a yarn clogging phenomenon occurs. The roller winding phenomenon is a phenomenon in which the yarn 18 is wound up by the front roller pair 23. The yarn clogging phenomenon is a phenomenon in which the yarn 18 is clogged in the suction tube 12. Hereinafter, each phenomenon will be described.

(Roller hoisting phenomenon)
The front roller pair 23 of the draft device 10 rotates so as to feed the yarn 18 toward the suction tube 12. At this time, if there is a protrusion on the roller surface of the front roller pair 23, the thread 18 may be caught by the protrusion, and the thread 18 may be wound up by the roller as shown in FIG. Thereby, the yarn 18 in the yarn introduction tube 14 is pulled back in the direction opposite to the normal direction. Then, the yarn 18 in the yarn introduction tube 14 moves upward while winding the yarn 18a of another layer that has previously formed the cake 24. As a result, the yarn 18a of another layer may come into contact with the outer peripheral surface of the yarn introduction tube 14, and this may cause the yarn 18 to be wound around the yarn introduction tube 14.

  The protrusions formed on the roller surfaces of the front roller pair 23 are, for example, due to adhesion of an adhesive substance. The yarn material supplied to the draft device 10 is mixed with an adhesive substance, and when the yarn 18 passes between the pair of front rollers 23, the adhesive substance adheres to the roller surface to form a protrusion. Sometimes.

(Thread jam phenomenon)
The yarn 18 supplied from the draft device 10 is stretched to a predetermined thickness. However, as shown in FIG. 11, if a portion 18 b that is thicker than the other portions is present in a part of the yarn 18, the thick portion 18 b may be caught by the suction tube 12 and the yarn may be clogged. When the yarn jam occurs, the yarn 18 is not sent from the suction tube 12 to the yarn introduction tube 14. For this reason, excessive twist is applied to the yarn 18 stagnating downstream of the suction tube 12 by the rotation of the pot 15. As a result, the yarn 18 contracts due to excessive twisting on the downstream side of the suction tube 12, so that the yarn 18 is drawn into the yarn introduction tube 14 through the yarn discharge port 14 b. If it does so, the thread | yarn 18 in the yarn introduction pipe | tube 14 will shrink, winding the thread | yarn 18 of the other layer which had previously formed the cake 24. As a result, the yarn 18 in another layer may come into contact with the outer peripheral surface of the yarn introduction tube 14, and the yarn 18 may be wound around the yarn introduction tube 14 as a result.

<Operation to suppress winding of yarn around the yarn introduction tube>
The pot spinning machine 1 according to the embodiment of the present invention suppresses the winding of the yarn 18 around the yarn introduction tube 14 by the following operation.

  First, the control unit 50 determines whether the behavior of the yarn 18 sucked into the suction tube 12 is normal or abnormal from the start to the end of the formation of the cake 24 at least. Judgment based on the signal. At this time, if the yarn 18 sucked into the suction tube 12 is ballooning, the output signal of the detection sensor 11 is a pulse signal having a predetermined cycle in which the Hi level and the Low level are alternately repeated. For this reason, while the detection sensor 11 outputs a pulse signal having a predetermined period, the detection sensor 11 detects yarn ballooning.

  In contrast, when the yarn 18 is wound up by the front roller pair 23 as described above, the yarn 18 is inclined obliquely between the front roller pair 23 and the suction tube 12 (see FIG. 10). Further, when the yarn 18 is inclined obliquely, the yarn 18 comes into contact with the edge of the suction tube 12, so that the yarn 18 does not balloon on the upstream side of the suction tube 12. Specifically, as shown in FIG. 12, the yarn 18 is moved to a position outside the ballooning trajectory C, which is greatly deviated from the sensor optical axis H of the detection sensor 11. For this reason, most of the light emitted from the light emitter 11a reaches the light receiver 11b without being blocked by the thread 18, and the amount of light received by the light receiver 11b increases. Therefore, the output signal of the detection sensor 11 is a signal having a constant level on the Hi side, as shown in FIG.

  Further, when the yarn clogging occurs in the suction tube 12, the sensor optical axis H of the detection sensor 11 is blocked by the thick portion 18b of the yarn as shown in FIG. 18 will no longer balloon. For this reason, most of the light emitted from the light emitter 11a is blocked by the thick portion 18b of the yarn, and the amount of light received by the light receiver 11b is reduced. Therefore, the output signal of the detection sensor 11 is a signal having a constant level on the Low side, as shown in FIG.

  When the detection sensor 11 outputs a pulse signal having a predetermined cycle (FIG. 6), the control unit 50 determines that the yarn is ballooning upstream of the suction tube 12, that is, the behavior of the yarn is normal. to decide. Further, when the detection sensor 11 outputs a signal of a certain level (FIG. 13 or FIG. 15), the control unit 50 does not balloon the yarn upstream of the suction tube 12, that is, the behavior of the yarn Judge as abnormal. As a specific method for determining whether the behavior of the yarn is normal or abnormal, for example, the following method can be considered.

  First, during the formation of the cake 24, the pot 15 rotates at a high speed. Further, on the upstream side of the suction tube 12, the yarn 18 turns at a high speed according to the rotation of the pot 15, whereby the yarn 18 forms a balloon. For this reason, when the yarn 18 is ballooned, the detection sensor 11 outputs a pulse signal with a very short cycle. For this reason, in the control unit 50, for example, the number of pulses of the pulse signal output from the detection sensor 11 is counted every predetermined time, and if the counted number of pulses is equal to or greater than a preset threshold value, the behavior of the yarn is increased. It is determined to be normal, and if it is less than the threshold value, it is determined to be abnormal.

  When the control unit 50 determines that the behavior of the yarn is abnormal, the control unit 50 immediately outputs a cutter drive signal to the cutter drive unit 52 in order to drive the cutting mechanism 13. As a result, the cutting blade 131 quickly moves in the A direction by the operation of the actuator unit 132, and the yarn 18 existing in the yarn path J is cut by the cutting edge 131 a of the cutting blade 131. When the yarn 18 is cut by the cutting mechanism 13 in this way, the yarn 18 existing in the yarn introduction pipe 14 at the time of cutting is discharged from the yarn discharge port 14b of the yarn introduction pipe 14 and wound around the inner wall 27 of the pot 15. . For this reason, the winding of the yarn 18 around the yarn introduction pipe 14 can be suppressed without using a bobbin having a special structure or a locking means, and damage to the parts can be avoided. Further, when the yarn 18 is wound around the yarn introduction tube 14, it is necessary to remove the yarn 18 from the yarn introduction tube 14 in the subsequent restoration process. However, according to the present embodiment, such a restoration process becomes unnecessary. The productivity of pot spinning can be improved.

  In the case of suppressing the winding of the yarn 18 around the yarn introduction tube 14 due to the roller winding phenomenon, the cutting position of the yarn by the cutting mechanism 13 is in the middle of the yarn path from the draft device 10 to the inner wall 27 of the pot 15. Any position may be set as long as it exists. On the other hand, when suppressing the winding of the yarn 18 around the yarn introduction pipe 14 due to the yarn clogging phenomenon, it is necessary to cut the yarn 18 below the thick portion 18b of the yarn 18 clogged in the suction tube 12. is there. For this reason, the yarn cutting position by the cutting mechanism 13 needs to be set at a position downstream of the suction tube 12 in the middle of the yarn path from the draft device 10 to the inner wall 27 of the pot 15.

  Further, when the cutting mechanism 13 is driven and the yarn 18 is cut during the formation of the cake 24, the yarn on the winding end side is compared with the case where the yarn cutting is performed by stopping the rotation of the back roller pair 21 and the middle roller pair 22. The end position is shifted upward. In that case, before driving the bobbin driving unit 55 in the rewinding step S3, the height of the yarn loosening member 33 is changed in accordance with the position of the yarn end on the winding end side, and then the bobbin driving unit 55 is driven. The bobbin pedestal 31 is raised. Thereby, even when the cutting mechanism 13 is driven during the formation of the cake 24, the yarn loosening member 33 can be brought into contact with the yarn end of the cake 24 formed so far, and the yarn can be wound back from the pot 15 to the bobbin 30.

<Other embodiments>
FIG. 16 is a schematic diagram showing a configuration example of a pot spinning machine according to another embodiment of the present invention.
The illustrated pot spinning machine 1 is different from the above-described embodiment in the configuration of the cutting mechanism 13 and the other configurations are the same. The cutting mechanism 13 includes a cutter 135 and a yarn introduction tube dropping mechanism 136.

  The cutter 135 is attached to the yarn introduction tube 14 in the vicinity of the yarn discharge port 14b. The cutter 135 is formed in a disk shape. A blade 135 a is formed on the outer periphery of the cutter 135 over the entire periphery. The blade 135 a of the cutter 135 is formed in a circular shape when viewed from the central axis direction of the yarn introduction tube 14. Further, the blade 135a of the cutter 135 is sharply formed so that the yarn 18 can be cut. The cutter 135 can be made of a metal material such as cemented carbide, for example.

  The yarn introduction tube dropping mechanism 136 is for dropping the yarn introduction tube 14 and has an openable / closable chuck portion 136a for holding the yarn introduction tube 14. The chuck portion 136a grips the yarn introduction tube 14 in the closed state, and releases the yarn introduction tube 14 in the opened state. The open / close state of the chuck portion 136a is controlled by the control unit 50 described above. The yarn introduction tube dropping mechanism 136 moves in the vertical direction integrally with the yarn introduction tube 14 by driving the yarn introduction tube driving unit 53. In addition, the chuck portion 136a of the yarn introduction tube dropping mechanism 136 is opened and closed by driving the cutter driving unit 52 described above. And when the chuck | zipper part 136a opens by the drive of the cutter drive part 52, the yarn introduction pipe | tube 14 will fall with dead weight at the moment. At that time, a flange portion (not shown) that is hooked with the yarn introduction tube insertion port 25 is provided at the upper end portion of the yarn introduction tube 14 so that the yarn introduction tube 14 does not fall out of the yarn introduction tube insertion port 25 of the pot 15. Is formed.

  In the pot spinning machine 1 according to this embodiment, when the control unit 50 determines that an abnormality has occurred in the behavior of the yarn 18 based on the output signal of the detection sensor 11, the control unit 50 outputs a cutter drive signal to the cutter drive unit 52. Thereby, the chuck part 136a of the yarn introduction tube dropping mechanism 136 is opened by the drive of the cutter drive unit 52, so that the yarn introduction pipe 14 is dropped. At this time, the cutter 135 drops together with the yarn introduction tube 14. Then, the thread 18 comes into contact with the cutter 135 as shown in FIG. At this time, the thread 18 is rubbed against the blade 135 a of the cutter 135 by the rotation of the pot 15. For this reason, the yarn 18 can be cut by the cutter 135 in the vicinity of the yarn discharge port 14 b of the yarn introduction tube 14. Therefore, similarly to the above-described embodiment, the winding of the yarn 18 around the yarn introduction tube 14 can be suppressed without using a bobbin having a special structure or a locking means.

<Modifications>
The technical scope of the present invention is not limited to the above-described embodiments, but includes forms to which various changes and improvements are added within the scope of deriving specific effects obtained by constituent elements of the invention and combinations thereof.

  For example, in the above embodiment, the behavior of the yarn is detected using the detection sensor 11 including the light emitter 11a and the light receiver 11b, but the present invention is not limited to this. That is, as the behavior of the yarn on the upstream side of the suction tube 12, for example, whether the yarn is wound up by the front roller pair 23 or whether the yarn is jammed in the suction tube 12 is not illustrated. You may employ | adopt the structure detected using an image sensor. Specifically, an image of the roller surface of the front roller pair 23 may be taken by an image sensor, and the behavior of the yarn may be detected based on the taken image data. Further, an image of the yarn sucked into the suction tube 12 may be taken by an image sensor, and the behavior of the yarn may be detected based on the taken image data. In that case, the control unit 50 takes in the image data captured by the image sensor and performs image processing, and based on the result of the image processing, the front roller pair 23 winds the yarn 18, or the suction tube 12 When it is recognized that the yarn 18 is clogged, it may be determined that the behavior of the yarn is abnormal.

  1 pot spinning machine, 10 draft device, 11 detection sensor, 12 suction tube, 13 cutting mechanism, 14 yarn introduction tube, 15 pot, 18 yarn, 24 cake, 27 inner wall, 50 control unit.

Claims (2)

A suction tube that sucks in the yarn supplied from the draft device;
A cylindrical pot,
A yarn introduction tube for guiding the yarn supplied through the suction tube into the pot;
With
A pot spinning machine that forms a cake by winding the yarn discharged from the yarn introduction tube around the inner wall of the pot,
A detection sensor for detecting the behavior of the yarn in the yarn path from the draft device to the suction tube,
A cutting mechanism for cutting a yarn in the middle of a yarn path from the draft device to the inner wall of the pot via the suction tube and the yarn introduction tube;
A control unit that controls to drive the cutting mechanism when it is determined that the behavior of the yarn is abnormal based on the detection result of the detection sensor;
Pot spinning machine equipped with. The pot spinning machine according to claim 1, wherein the detection sensor detects ballooning of the yarn sucked into the suction tube as the behavior of the yarn.

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