JP2019137952A - Pot spinning method and pot spinning machine - Google Patents

Abstract

To provide a pot spinning method capable of inexpensively preventing occurrence of a rewinding failure due to generation of a string.SOLUTION: A pot spinning method includes: a cake formation step of rotating a pot 12 in a state of inserting a yarn guide tube 11 into the pot 12 and moving the yarn guide tube 11 to a center axis direction of the pot 12 to wind a yarn 18 discharged from a lower end 11a of the yarn guide tube 11 around an inner wall 22 of the pot 12 and form a cake 28; and a rewinding step of advancing a bobbin 25 into the pot 12 to rewind the yarn 18 forming the cake 28 to the bobbin 25 from the inner wall 22 of the pot 12. A string 33 being present in space within the pot 12 away from the inner wall 22 of the pot 12, during or after formation of the cake 28, is pressed to the center axis direction of the pot 12 by a pressing surface 24a of a pressing member 24 and then disappeared.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pot spinning method and a pot spinning machine.

  As one of spinning methods, a pot spinning method using a cylindrical pot is known. The pot spinning method is roughly divided into three steps. The first step is a step of stretching the yarn material to a predetermined fineness. The second step is a step of forming a cake by winding the yarn stretched in the first step around the inner wall of the pot. The third step is a step of rewinding the yarn forming the cake from the inner wall of the pot onto the bobbin.

  In the second step, the pot is rotated at a predetermined number of revolutions, and the yarn stretched in the first step is guided into the pot through the yarn introduction tube. The yarn guided into the pot is discharged from one end portion of the yarn introduction tube, and is pressed against the inner wall of the pot by the centrifugal force accompanying the rotation of the pot. At that time, the yarn discharged from the yarn introduction tube is wound around the inner wall of the pot while being twisted by the rotation of the pot.

  In the second step, a cake is formed on the inner wall of the pot by moving one end of the yarn introduction pipe toward the opening of the pot while reciprocating the yarn introduction pipe in the central axis direction of the pot. . When the cake has been formed, the thread is trimmed. Yarn cutting is performed by cutting the yarn upstream of the yarn introduction tube in the yarn feeding direction.

  When thread trimming is performed, the tension of the thread is released at that moment. When the tension of the yarn is released, the reaction force causes the yarn to jump out from one end of the yarn introduction tube. As a result, a part of the yarn jumping out from the yarn introduction tube may float in a loop shape, and the floated yarn may be present in the space in the pot while being separated from the inner wall of the pot. Thus, the yarn that exists away from the inner wall of the pot is also called a string. In this specification, the thread | yarn which forms a string is called a string thread | yarn. The string yarn is curved by receiving a centrifugal force accompanying the rotation of the pot, but is present away from the yarn wound around the inner wall of the pot. Further, both ends of the string yarn are supported in a fixed state by being caught by a yarn wound around the inner wall of the pot.

  If the string yarn exists in the space in the pot as described above, for example, the string yarn may come into contact with the outer peripheral surface of the yarn introduction tube, and the string yarn may be wound around the yarn introduction tube together with other yarns. In addition to this, for example, the string thread may come into contact with the outer peripheral surface of the bobbin while the bobbin is being inserted into the pot, and thereby the winding of the thread around the bobbin may start earlier than expected. As a result, in any case, the yarn cannot be properly wound around the bobbin, resulting in a winding failure.

  Patent Document 1 describes an invention related to a pot spinning machine in which an apron pair for yarn introduction is provided on the downstream side of a pair of front rollers constituting a draft device, and a tip portion of the apron pair can be arranged in the pot. Yes. In the invention described in Patent Document 1, even if the yarn is cut upstream of the apron pair, the cut yarn can be guided into the pot while being nipped by the apron pair. For this reason, the distance from the yarn end to the pot inner wall is shortened when the yarn end serving as the yarn cutting point passes through the tip of the apron pair. Therefore, the yarn end can be wound around the inner wall of the pot while suppressing the generation of the string yarn.

Japanese Patent Publication No. 29-8226

  However, in the invention described in Patent Document 1, since an apron pair is used instead of the yarn introduction tube, there are the following problems. The yarn introduction tube has a simple structure of an elongated cylindrical shape, whereas the apron pair has a complicated structure including rollers and other members that support the apron. Further, in order to shift the winding position of the yarn with respect to the inner wall of the pot in the central axis direction of the pot, a mechanism for moving the pot itself up and down is necessary. In addition, the size of the parts is increased to introduce the apron pair into the pot. Therefore, in the invention described in Patent Document 1, the configuration of the pot spinning machine becomes complicated and large, and the cost required for implementing the invention increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a pot spinning method and a pot spinning machine that can suppress the occurrence of a rewinding failure due to the occurrence of string yarns at low cost. There is.

The present invention provides a yarn that is discharged from one end of the yarn introduction tube by rotating the pot with the yarn introduction tube inserted into the pot and moving the yarn introduction tube in the central axis direction of the pot. A cake forming step of winding a wire around the inner wall of the pot to form a cake, and a rewinding step of causing the bobbin to advance into the pot and rewinding the yarn forming the cake from the inner wall of the pot to the bobbin. A pot spinning method comprising:
During or after the formation of the cake, the string yarn that is separated from the inner wall of the pot and is present in the space in the pot is pressed and extinguished by the pressing surface of the pressing member in the central axis direction of the pot.

The present invention provides a yarn that is discharged from one end of the yarn introduction tube by rotating the pot with the yarn introduction tube inserted into the pot and moving the yarn introduction tube in the central axis direction of the pot. Is a pot spinning machine that wraps around the inner wall of the pot to form a cake,
A pressing member having a pressing surface that presses and disappears the string thread that is away from the inner wall of the pot and is present in the space in the pot in the middle of the pot during or after the formation of the cake.

  In the pot spinning machine according to the present invention, the pressing member is provided on the yarn introduction tube, and the string yarn is pressed by the pressing surface by using the movement operation of the yarn introduction tube when forming the cake. May be.

  In the pot spinning machine according to the present invention, the pressing member is provided on the bobbin, and the string is pressed by the pressing surface using a moving operation of the bobbin when the bobbin is advanced into the pot. May be.

  In the pot spinning machine according to the present invention, the pressing surface may be circular when viewed from the central axis direction of the pot.

  According to the present invention, it is possible to suppress the occurrence of a winding failure due to the generation of a string yarn at a low cost.

It is the schematic which shows the structural example of the principal part of the pot spinning machine which concerns on embodiment of this invention. It is sectional drawing to which a part of FIG. 1 was expanded. It is a side view explaining the structure of a pressing member. It is IV arrow line view of FIG. 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 figure which shows the mode in the pot in a cake formation step. It is a figure explaining operation | movement of the yarn introduction pipe | tube in a cake formation step. It is a figure which shows the state which the string thread generate | occur | produced in the pot. It is a figure which shows an example of the rewinding defect. It is a figure which shows the state which the string thread contacted the bobbin. It is a figure which shows the state from which the incorrect winding of the thread | yarn to a bobbin was started. It is a figure which shows the state in which the incorrect winding of the thread | yarn to a bobbin is progressing. It is a figure which shows the state which the illegal winding of the thread | yarn to a bobbin was finished. It is a figure which shows the state before pressing a string by the pressing surface of a pressing member. It is a figure which shows the state which pressed the string with the pressing surface of the pressing member. It is a figure explaining the motion of a string when a string is pressed by the pressing surface of a pressing member. It is a figure which shows the mode in the pot at the time of the start of a rewinding step. It is a figure which shows the mode in the pot at the time of completion | finish of the rewinding step.

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

<Pot spinning machine>
First, a pot spinning machine according to an embodiment of the present invention will be described.
FIG. 1 is a schematic diagram showing a configuration example of a main part 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 yarn introduction tube 11, a pot 12, and a bobbin support portion 13. 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 to a predetermined thickness. The draft device 10 is configured using a plurality of roller pairs including a back roller pair 15, a middle roller pair 16, and a front roller pair 17. The plurality of roller pairs are arranged in the order of the back roller pair 15, the middle roller pair 16, and the front roller pair 17 from the upstream side to the downstream side in the yarn material feeding direction.

  Each of the roller pairs 15, 16, and 17 rotates according to the driving of a draft driving unit described later. Comparing the rotation speed (rpm) of each roller pair 15, 16, 17 per unit time, the rotation speed of the middle roller pair 16 is higher than the rotation speed of the back roller pair 15, and the rotation speed of the front roller pair 17 is It is higher than the rotation speed of the middle roller pair 16. Thus, the rotational speeds of the respective roller pairs 15, 16, and 17 are different from each other, and the draft device 10 draws the yarn material finely by utilizing the difference in rotational speed, that is, the rotational speed difference. In the following description, the rotation number of the roller pair is also referred to as a rotation speed. The rotation speed and rotation speed of the roller pair are proportional to each other.

(Yarn guide tube)
The yarn introduction tube 11 guides the yarn 18 stretched to a predetermined thickness by the draft device 10 into the pot 12. The yarn introduction tube 11 is formed in an elongated tubular shape. The shape when the yarn introduction tube 11 is cross-sectioned in the direction orthogonal to the length direction is circular.

  The yarn introduction tube 11 is disposed on the downstream side of the draft device 10 so as to be coaxial with the pot 12. The lower part of the yarn introduction tube 11 is inserted into the pot 12. The yarn introduction tube 11 guides the yarn 18 supplied from the front roller pair 17 through the yarn supply tube 14 into the pot 12. The yarn 18 stretched by the draft device 10 is drawn into the yarn supply pipe 14 using, for example, a swirling flow of air, and then introduced into the yarn introduction pipe 11 through the yarn supply pipe 14. The yarn 18 introduced into the yarn introduction tube 11 is discharged from the lower end portion 11 a of the yarn introduction tube 11. The yarn introduction tube 11 is provided so as to be movable in the vertical direction by a yarn introduction tube driving unit described later.

  A pressing member 24 is provided on the yarn introduction tube 11. The pressing member 24 is disposed at the lower end portion 11 a of the yarn introduction tube 11. Below, the structure of the pressing member 24 is demonstrated using FIG.2, FIG3 and FIG.4. FIG. 2 is an enlarged cross-sectional view of a part of FIG. In FIG. 2, the central axis of the yarn introduction tube 11 is indicated by a one-dot chain line. FIG. 3 is a side view for explaining the configuration of the pressing member, and FIG. 4 is a view taken along arrow IV in FIG.

(Pressing member)
The pressing member 24 has a pressing surface 24a and a tapered surface 24b, and is formed in a trapezoidal cone shape as shown in FIG. The pressing member 24 is provided to eliminate the string thread 33 (see FIG. 9) that is separated from the inner wall 22 of the pot 12 and exists in the space in the pot 12. Both the pressing surface 24a and the tapered surface 24b are formed as smooth surfaces without irregularities. The pressing surface 24 a is formed on the pressing member 24 in order to press the string 33 in the central axis direction of the pot 12. In the present embodiment, when the string thread 33 is generated in the space in the pot 12, the string thread 33 is pressed downward by the pressing surface 24 a of the pressing member 24. For this reason, the pressing surface 24a is arranged vertically downward.

  The pressing surface 24 a is disposed at the same position as the lower end portion 11 a of the yarn introduction tube 11 in the central axis direction of the yarn introduction tube 11. However, the present invention is not limited to this, and the pressing surface 24a may be arranged in a state of slightly protruding below the lower end portion 11a of the yarn introduction tube 11.

  The pressing surface 24a is a plane parallel to a direction orthogonal to the central axis K (see FIG. 1) of the pot 12. Further, the pressing surface 24 a is formed in a circular shape (see FIG. 4) when viewed from the central axis direction of the pot 12. In the present embodiment, since the yarn introduction tube 11 is arranged coaxially with the pot 12, the center axis of the pot 12 may be read as the center axis of the yarn introduction tube 11. The diameter Dg (see FIGS. 2 and 4) of the pressing surface 24a is set to be larger than the maximum diameter Da (see FIG. 1) of the winding region of the bobbin 25. The rewind region of the bobbin 25 refers to a target region where the yarn forming the cake 28 is wound when the yarn is wound from the inner wall 22 of the pot 12 to the bobbin 25. The diameter Dg of the pressing surface 24a is set smaller than the minimum inner diameter Db (see FIG. 1) of the cake 28. The diameter Dg of the pressing surface 24 a corresponds to the maximum outer diameter of the pressing member 24. For this reason, if the diameter Dg of the pressing surface 24a is less than the minimum inner diameter Db of the cake 28, the pressing member 24 can be prevented from coming into contact with the cake 28.

  The tapered surface 24b is inclined so that the diameter of each part of the tapered surface 24b continuously decreases from the pressing surface 24a upward. The inclination angle θ (see FIG. 2) of the tapered surface 24a with respect to the outer peripheral surface of the yarn introduction tube 11 is preferably set in the range of 15 degrees to 60 degrees, more preferably 30 degrees to 50 degrees.

  The pressing member 24 can be made of, for example, ceramics or metal. When both the yarn introduction tube 11 and the pressing member 24 are made of a metal material, both can be formed as an integral structure. In this case, for example, stainless steel can be applied as the metal material. Further, when the yarn introduction tube 11 and the pressing member 24 have different structures, a through hole having a diameter corresponding to the outer diameter of the yarn introduction tube 11 is formed in the pressure member 24 and is bonded to the yarn introduction tube 11, for example The pressing member 24 may be fixed by screwing, press fitting, or the like.

(Thread sensor)
A yarn sensor 19 is disposed between the front roller pair 17 and the yarn supply pipe 14. The yarn sensor 19 is a sensor that detects the state of the yarn stretched by the draft device 10. In the present embodiment, as an example of the yarn state detected by the yarn sensor 19, yarn breakage is cited. Moreover, in this embodiment, the yarn sensor 19 is comprised using the optical sensor which combined the light emitter 19a and the light receiver 19b as an example.

(pot)
The pot 12 is used for forming the cake 28 and rewinding the yarn. The pot 12 is formed in a cylindrical shape. The pot 12 is provided to be rotatable around the central axis of the pot 12. The center axis K of the pot 12 is arranged in parallel with the vertical direction. For this reason, one of the pots 12 in the central axis direction is upward and the other is downward.

  The pot 12 rotates in accordance with the driving of a pot driving unit described later. A yarn introduction tube insertion port 21 is formed on the upper end side of the pot 12. The yarn introduction tube insertion port 21 is an opening for inserting the yarn introduction tube 11 into the pot 12. An opening 23 is formed at the lower end of the pot 12. The yarn introduction tube insertion port 21 opens upward with a diameter smaller than the inner diameter Dp (see FIG. 1) of the pot 12. The inner diameter Dp of the pot 12 is a diameter that defines the inner volume of the pot 12 and is based on the position of the inner wall 22. The opening 23 opens downward with the same diameter as the inner diameter Dp of the pot 12.

(Bobbin support)
The bobbin support portion 13 supports the bobbin 25. The bobbin support portion 13 includes a bobbin pedestal 26 and a bobbin mounting portion 27. The bobbin pedestal 26 is formed in a plate shape. The bobbin mounting part 27 is fixed to the bobbin base 26. The bobbin mounting portion 27 is formed in a column shape and is disposed so as to protrude upward from the upper surface of the bobbin base 26.

  The bobbin mounting portion 27 is a portion where the bobbin 25 is detachably mounted. The bobbin mounting portion 27 is disposed coaxially with the pot 12 so as to face the yarn introduction tube 11 in the central axis direction of the pot 12. Further, the bobbin mounting portion 27 is disposed below the yarn introduction tube 11. For this reason, when the bobbin 25 is mounted on the bobbin mounting portion 27, the bobbin 25 is disposed so as to face the yarn introduction tube 11 on the central axis K of the pot 12.

  The bobbin 25 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 25 has a hollow structure at least on one end side. The bobbin 25 is supported upright from the bobbin pedestal 26 by fitting a hollow portion on one end side to the bobbin mounting portion 27.

  The bobbin support portion 13 is provided so as to be movable in the vertical direction by a bobbin driving portion described later. The outer diameter of the bobbin 25 is set smaller than the minimum inner diameter Dp (see FIG. 1) of the cake 28 formed on the inner wall 22 of the pot 12. Thereby, when the bobbin 25 is inserted and arranged in the pot 12 through the opening 23 of the pot 12, contact between the bobbin 25 and the cake 28 can be avoided.

  Further, a thread loosening member 31 is attached to the bobbin base 26. The yarn unraveling member 31 loosens the yarn that becomes the starting point of rewinding from the cake 28 by contacting the end 28b on the winding end side of the cake 28. The cake 28 is a laminated body of yarns formed on the inner wall 22 of the pot 12 by the operation of the yarn introduction tube 11 and the pot 12 described later.

FIG. 5 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. 5, the pot spinning machine 1 includes a control unit 51, a draft driving unit 52, a yarn introduction tube driving unit 53, a pot driving unit 54, and a bobbin driving unit 55.

(Control part)
The controller 51 controls the overall operation of the pot spinning machine 1 as a whole. A draft 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 51 as targets of operation control. The yarn sensor 19 is electrically connected to the control unit 51. The yarn sensor 19 outputs a yarn break occurrence signal to the control unit 51 to notify that when a yarn break occurs in the draft device 10.

(Draft drive)
The draft drive unit 52 rotates the back roller pair 15, the middle roller pair 16, and the front roller pair 17 at a predetermined number of rotations. The draft driving unit 52 rotates the back roller pair 15, the middle roller pair 16, and the front roller pair 17 by driving based on a draft driving signal given from the control unit 51 to the draft driving unit 52.

(Yarn guide tube drive)
The yarn introduction tube driving unit 53 moves the yarn introduction tube 11 in the vertical direction. The yarn introduction tube driving unit 53 moves the yarn introduction tube 11 in the vertical direction by driving based on the yarn introduction tube drive signal given from the control unit 51 to the yarn introduction tube driving unit 53.

(Pot drive unit)
The pot driving unit 54 rotates the pot 12. The pot driving unit 54 rotates based on the center axis K of the pot 12 as a rotation center by driving based on the pot driving signal given from the control unit 51.

(Bobbin drive)
The bobbin driving unit 55 moves the bobbin 25 in the vertical direction. The bobbin driving unit 55 is driven based on the bobbin driving signal given from the control unit 51 to move the bobbin 25 mounted on the bobbin mounting unit 27 of the bobbin support unit 13 together with the thread loosening member 31 in the vertical direction. .

<Pot spinning method>
Subsequently, a pot spinning method according to an embodiment of the present invention will be described.
FIG. 6 is a diagram showing a basic flow of the pot spinning method.
As shown in FIG. 6, 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 to a predetermined thickness. The cake forming step S2 is a step of forming the cake 28 by winding the yarn stretched to a predetermined thickness in the stretching step S1 around the inner wall 22 of the pot 12. The rewinding step S3 is a step of rewinding the yarn forming the cake 28 around the bobbin 25. Hereinafter, the operation of the pot spinning machine 1 based on each step will be described.

  Before the pot spinning machine 1 is operated, the yarn introduction tube 11 is disposed close to the yarn supply tube 14, the bobbin 25 is attached to the bobbin attachment portion 27 of the bobbin support portion 13, and the bobbin 25 Is retracted below the pot 12 and arranged. Further, the lower portion of the yarn introduction tube 11 is arranged in a state of being inserted into the pot 12.

(Stretching step)
The stretching step S <b> 1 is performed using the draft device 10. The draft driving unit 52 is driven based on a draft driving signal given from the control unit 51, thereby rotating the back roller pair 15, the middle roller pair 16 and the front roller pair 17 respectively 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 15, 16, and 17.

  At that time, the control unit 51 sets the rotation speed of the back roller pair 15 to be lower than the rotation speed of the middle roller pair 16 and sets the rotation speed of the middle roller pair 16 to be lower than the rotation speed of the front roller pair 17. Set. As a result, the yarn is stretched between the back roller pair 15 and the middle roller pair 16 due to the difference in rotational speed between the roller pairs. Similarly, the yarn is stretched between the middle roller pair 16 and the front roller pair 17 due to the difference in rotational speed between the roller pairs.

  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 15, the middle roller pair 16, and the front roller pair 17. The yarn 18 thus stretched is then drawn into the yarn supply pipe 14 using a swirling flow of air or the like and then introduced into the yarn introduction pipe 11.

  Further, the pot driving unit 54 drives the pot 12 at a predetermined number of rotations by driving based on a pot driving signal given from the control unit 51 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 11 and the pot 12. The yarn introduction tube drive unit 53 moves the yarn introduction tube 11 downward by a predetermined amount by being driven based on the yarn introduction tube drive signal given from the control unit 51. Further, the pot driving unit 54 continues to rotate the pot 12 by driving based on the pot driving signal given from the control unit 51. When the yarn introduction tube 11 is moved downward, the yarn introduction tube 11 is separated from the yarn supply tube 14. Further, the yarn 18 introduced into the yarn introduction tube 11 from the yarn supply tube 14 is discharged from the lower end portion 11 a of the yarn introduction tube 11.

  Centrifugal force due to rotation of the pot 12 acts on the yarn 18 discharged from the lower end portion 11 a of the yarn introduction tube 11, and the yarn 18 is pressed against the inner wall 22 of the pot 12 by this centrifugal force. In addition, the yarn 18 discharged from the lower end portion 11 a of the yarn introduction tube 11 is wound around the inner wall 22 of the pot 12 in a state where twist is applied by the rotation of the pot 12.

  Further, in case forming step S2, the yarn introduction tube driving unit 53 is driven based on the yarn introduction tube drive signal, thereby repeatedly causing the yarn introduction tube 11 to move up and down at a predetermined cycle as shown in FIG. While reciprocating, the position of the yarn introduction tube 11 is relatively displaced downward. As a result, the yarn 18 is wound and laminated on the inner wall 22 of the pot 12 to form a cake 28. In FIG. 7, the display of the pressing member 24 is omitted.

FIG. 8 is a diagram for explaining the operation of the yarn introduction tube in the cake forming step. The vertical axis in the figure indicates the position of the yarn introduction tube in the pot central axis direction, and the horizontal axis indicates time.
In FIG. 8, the yarn introduction tube 11 first descends to the P1 position, then rises to the P2 position, then descends to the P3 position, and then rises to the P4 position. That is, the yarn introduction tube 11 repeatedly moves up and down in the vertical direction. In this case, a period T1 from when the yarn introduction pipe 11 reaches the P1 position to the arrival at the P3 position, and a period T2 until the yarn introduction pipe 11 reaches the P2 position after reaching the P2 position, Each is one cycle. Further, since the position of the yarn introduction tube 11 is relatively displaced downward, the P3 position is lower than the P1 position, and the P4 position is lower than the P2 position. The vertical displacement amount H1 between the P1 position and the P3 position and the vertical displacement amount H2 between the P2 position and the P4 position are displacement step amounts of the yarn introduction tube 11 in one cycle, respectively. That is, the yarn introduction tube 11 is displaced downward by a certain displacement step amount while repeatedly reciprocating in the vertical direction repeatedly at a constant cycle.

  Such movement operation of the yarn introduction tube 11 continues until the yarn introduction tube 11 reaches the Pm position. In this case, the P1 position defines an end portion (hereinafter also referred to as “start end”) 28a of the cake 28 shown in FIG. 1, and the Pm position is located on the winding end side of the cake 28 shown in FIG. An end (hereinafter also referred to as “end”) 28b is defined. Further, the period during which the yarn introduction tube 11 moves from the P1 position to the Pm position corresponds to the middle of the formation of the cake 28, and the period after the yarn introduction tube 11 reaches the Pm position corresponds to the end of the formation of the cake 28. .

  The controller 51 moves the yarn introduction tube 11 as shown in FIGS. 7 and 8 by giving a yarn introduction tube drive signal to the yarn introduction tube drive unit 53. Then, thread trimming is performed when the yarn introduction tube 11 reaches the Pm position. The formation of the cake 28 is completed by this thread trimming. Thread trimming is performed under the control of the control unit 51. Specifically, the control unit 51 controls the driving of the draft driving unit 52 so as to stop both the rotation of the back roller pair 15 and the middle roller pair 16 while continuing the rotation of the front roller pair 17. Then, the yarn 18 is forcibly cut on the downstream side of the middle roller pair 16. As a result, a cake 28 is formed on the inner wall 22 of the pot 12 in a shape as shown in FIG.

  When thread trimming is performed as described above, the string 33 may be generated in the space in the pot 12, as shown in FIG. FIG. 9 is a view of the inside of the pot 12 as viewed from the opening 23 side. In FIG. 9, the rotation direction R of the pot 12 is indicated by an arrow, and the display of the pressing member 24 is omitted.

  As described in the “Background Art” section, the string thread 33 is released from the tension of the thread by the thread trimming, and a part of the thread jumping out from the lower end portion 11 a of the yarn introduction tube 11 is released from the inner wall 22 of the pot 12. It exists in the space in the pot 12 apart. In the circumferential direction of the pot 12, the direction and the diameter Lr of the formed string 33 are different depending on the situation at that time. The vicinity of the top 33 a of the string thread 33 is curved with a gentler bend than the thread 18 wound around the inner wall 22 of the pot 12. The diameter Lr of the string thread 33 indicates the diameter from the rotation center C of the pot 12 to the top 33a of the string thread 33. The diameter Lr of the string thread 33 increases as the length of the string thread 33 increases. Both ends 33b of the string thread 33 are supported in a fixed state by being caught by the thread 18 wound around the inner wall 22 of the pot 12. Thus, when the string thread 33 is present in the space in the pot 12, as described above, the string thread 33 contacts the outer peripheral surface of the yarn introduction tube 11, or the string yarn 33 contacts the outer peripheral surface of the bobbin 25. May cause a rewinding failure.

  Specifically, for example, when the string 33 contacts the outer peripheral surface of the yarn introduction tube 11, the yarn 18 may be wound around the yarn introduction tube 11 as shown in FIG. Further, for example, as shown in FIG. 11 (A), the string 33 is generated when the cake 28 is formed in the pot 12 and the thread is trimmed, and then inserted when the bobbin 25 is inserted into the pot 12. The string thread 33 may come into contact with the outer peripheral surface of the bobbin 25 during the process. When the string thread 33 comes into contact with the outer peripheral surface of the bobbin 25, the string thread 33 rotating with the rotation of the pot 12 is easily wound around the bobbin 25. When the string 33 is actually wound around the bobbin 25, the unwinding of the thread 18 around the bobbin 25 is started as shown in FIG. 11B. Incorrect rewind progresses like this. As a result, as shown in FIG. 11D, the yarn 18 is unwound illegally at a position greatly deviating from the rewinding area planned for the bobbin 25.

  Therefore, in the present embodiment, after the formation of the cake 28 is completed in the cake forming step S2, the control unit 51 moves the yarn introduction tube 11 that has reached the Pm position shown in FIG. 8 downward by a predetermined amount Lh. . As a result, the yarn introduction tube 11 is lowered from the Pm position to the Pn position, and the pressing member 24 is also lowered accordingly. Further, when the string thread 33 is generated by the thread trimming, the string thread 33 disappears when the pressing member 24 presses the string thread 33 when the yarn introduction tube 11 moves downward from the Pm position to the Pn position. The reason is as follows.

  First, when the yarn introduction tube 11 moves downward from the Pm position to the Pn position, as shown in FIGS. 12 and 13, the pressing surface 24 a comes into contact with the string yarn 33 by the lowering of the pressing member 24, and the string yarn 33 is left as it is. Is pressed downward. Then, a tensile force F is applied to the string yarn 33 that protrudes outward from the pressing surface 24a, and the string yarn 33 is pulled by the tensile force F. As a result, for example, if the string thread 33 is at the position indicated by the broken line in FIG. 14, the top 33a of the string thread 33 is closer to the rotation center C of the pot 12, that is, the string thread diameter Lr (see FIG. 9) is small. Move in the direction.

  On the other hand, the centrifugal force accompanying the rotation of the pot 12 acts in a direction away from the rotation center C of the pot 12. For this reason, as shown by the one-dot chain line in FIG. 14, before the top 33a of the string 33 reaches the rotation center C of the pot 12, centrifugal force acts on the string 33 in the upward direction in FIG. When the top 33a of the string thread 33 reaches the rotation center C of the pot 12 as indicated by a two-dot chain line, a centrifugal force acts on the string thread 33 in the downward direction of FIG. For this reason, the string 33 that has reached the rotation center C of the pot 12 is brought close to the inner wall 22 of the pot 12 by centrifugal force. As a result, the string 33 disappears from the space in the pot 12. At this time, if the diameter Dg of the pressing surface 24a of the pressing member 24 is set to be larger than the maximum diameter Da of the rewinding region of the bobbin 25, the string thread 33 that may come into contact with the rewinding region of the bobbin 25 is pressed. It can be extinguished by the member 24.

  When the yarn introduction tube 11 is moved from the Pm-1 position to the Pn position, the movement of the yarn introduction tube 11 may be temporarily stopped or temporarily stopped when the yarn introduction tube 11 reaches the Pm position. The movement of the yarn introduction tube 11 may be continued without doing so.

  The cake forming step S2 ends when the cake is formed and the yarn is cut as described above, and the yarn introduction tube 11 is lowered to the Pn position. The above-described stretching step S1 is performed in parallel with the cake forming step S2, and ends when the thread trimming is performed in the cake forming step S2.

(Rewind step)
The rewinding step S3 is performed using the pot 12, the bobbin 25, and the thread loosening member 31. In the rewinding step S <b> 3, the bobbin 25 and the yarn loosening member 31 are arranged in the pot 12 through the opening 23 by driving the yarn introduction tube driving unit 53, the pot driving unit 54 and the bobbin driving unit 55.

  The yarn introduction tube drive unit 53 is driven based on the yarn introduction tube drive signal given from the control unit 51, thereby moving the yarn introduction tube 11 upward as shown in FIG. Accordingly, in the pot 12, the yarn introduction tube 11 is retracted to a position where it does not contact the bobbin 25 before the bobbin 25 enters. The pot driving unit 54 continues to rotate the pot 12 by driving based on the pot driving signal given from the control unit 51.

  The bobbin driving unit 55 moves based on the bobbin driving signal given from the control unit 51 to move the bobbin support unit 13 upward. As a result, the bobbin 25 attached to the bobbin attaching portion 27 (see FIG. 1) and the thread loosening member 31 attached to the bobbin base 26 both move upward. Further, the bobbin 25 and the thread loosening member 31 enter the pot 12 through the opening 23 of the pot 12. At that time, the upper end portion of the yarn loosening member 31 comes into contact with the end 28b of the cake 28 at the position of the broken line shown in FIG. Then, the yarn wound around the end 28b of the cake 28 is loosened at the place where the yarn loosening member 31 comes into contact, and the loosened yarn leaves the inner wall 22 of the pot 12 and winds around the bobbin 25. As a result, winding of the yarn around the bobbin 25 is started using the loosened yarn as a starting point for winding.

  After that, when all the yarns forming the cake 28 are wound back onto the bobbin 25 as shown in FIG. 16, the control unit 51 gives the bobbin driving unit 55 a bobbin driving unit 55, thereby causing the bobbin supporting unit 13 to move. Move down. Thereby, both the bobbin 25 and the thread loosening member 31 move downward, and the rewinding step S3 is completed.

  By the above operation, the bobbin 25 around which the pipe yarn 29 is wound is obtained. The bobbin 25 around which the tube thread 29 is wound is removed from the bobbin mounting portion 27. Thereafter, after the empty bobbin 25 is mounted on the bobbin mounting portion 27, the same operation as described above is performed.

  The string thread 33 is not only generated by the above-described thread trimming, but may also be generated by a thread break that causes the thread 18 to break during the formation of the cake 28. The difference between “thread trimming” and “thread trimming” is as follows. The thread trimming is intentionally performed by the control unit 51 when the predetermined amount of the thread 18 is wound around the inner wall 22 of the pot 12, that is, when the formation of the cake 28 is finished. The yarn breakage is a phenomenon in which the yarn 18 is broken for some reason before the predetermined amount of yarn 18 is wound around the inner wall 22 of the pot 12, that is, while the cake 28 is being formed.

  When yarn breakage occurs during the formation of the cake 28, the yarn introduction tube 11 is not lowered to the Pm position at the stage of yarn breakage occurrence. For this reason, even when the string yarn 33 is generated due to yarn breakage, the yarn introduction tube 11 continues to be displaced downward by a certain displacement step amount. Therefore, when the string yarn 33 is generated due to the yarn breakage, the pressing surface 24a of the pressing member 24 comes into contact with the string yarn 33 while the yarn introduction tube 11 is lowered to the Pm position or the Pn position after the occurrence. The string 33 is pressed downward. Therefore, the string thread 33 generated during the formation of the cake 28 can also be eliminated by the pressing member 24.

  Further, when the string thread 33 is generated during the formation of the cake 28, the diameter Lr (see FIG. 9) of the string thread 33 is close to the diameter Dg (see FIG. 2) of the pressing surface 24a. It is conceivable that when the string 24 is pressed by the member 24, the vicinity of the top 33a of the string 33 passes through the pressing surface 24a. In such a case, the pressing member 24 comes into contact with the string yarn 33 when the yarn introduction tube 11 is moved upward in the rewinding step S3. At this time, if a taper surface 24b is formed on the pressing member 24, the vicinity of the apex 33a of the string yarn 33 slides down while contacting the taper surface 24b. For this reason, the pressing member 24 can be moved upward without excessively hooking the pressing member 24 onto the string 33.

<Effect of embodiment>
In the embodiment of the present invention, a pressing member 24 is provided at the lower end portion 11 a of the yarn introduction tube 11, and during or after the formation of the cake 28, the string that is separated from the inner wall 22 of the pot 12 and exists in the space in the pot 12. A configuration is adopted in which the thread 33 is pressed downward by the pressing surface 24a of the pressing member 24 to disappear. This avoids the situation where the string 33 contacts the outer peripheral surface of the yarn introduction tube 11 and the outer peripheral surface of the bobbin 25 without employing a complicated and large-scale configuration such as the apron pair described in Patent Document 1. be able to. For this reason, it is possible to suppress the occurrence of rewinding failure due to the generation of the string yarn 33 at a low cost.

  In the embodiment of the present invention, the pressing surface 24 a of the pressing member 24 is formed in a circular shape when viewed from the central axis direction of the pot 12. For this reason, when the string member 33 is pressed by the pressing member 24, the movement of the string string 33 that is rotated with the rotation of the pot 12 regardless of the direction in which the string string 33 is formed in the circumferential direction of the pot 12. The string 33 can be supported by the peripheral portion of the pressing surface 24a so that the smoothness is smooth.

  Further, in the embodiment of the present invention, the pressing member 24 is provided on the yarn introduction tube 11 so that the string yarn 33 is pressed by the pressing surface 24a using the moving operation of the yarn introduction tube 11 when the cake 28 is formed. I have to. For this reason, the string yarn 33 can be extinguished without substantially reducing the productivity of the pot spinning.

<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 pressing surface 24a of the pressing member 24 is a plane parallel to the direction orthogonal to the central axis of the pot 12, but the present invention is not limited to this. That is, if the string 33 is pressed by the pressing member 24 in the central axis direction of the pot 12, the top surface 33a of the string 33 can be moved in a direction approaching the rotation center C of the pot 12, and the pressing surface 24a. May be formed in any manner. For example, the pressing surface 24a of the pressing member 24 may be a concave surface recessed upward.

  In the above embodiment, the pressing surface 24a of the pressing member 24 has a circular shape when viewed from the central axis direction of the pot 12. However, the present invention is not limited to this, and instead of a circular shape, for example, a polygonal shape or the like. There may be.

  Moreover, in the said embodiment, although the example using the taper structure bobbin 25 was shown, this invention is not restricted to this, You may use the bobbin of a straight structure where the diameter of a winding area | region is uniform.

  Moreover, in the said embodiment, although the press member 24 was provided in the lower end part 11a of the yarn introduction pipe | tube 11, this invention is not limited to this. For example, you may provide a press member in the upper end part of the bobbin 25. FIG. Alternatively, a pressing member may be provided on both the yarn introduction tube 11 and the bobbin 25. In addition to the yarn introduction tube 11 and the bobbin 25, a pressing member may be provided in a lifting mechanism (not shown).

  However, when the pressing member is provided in the lifting mechanism, it is necessary to move the pressing member by the lifting mechanism separately from the moving operation of the yarn introduction tube 11 and the bobbin 25. On the other hand, when the pressing member 24 is provided in the yarn introduction tube 11, as described above, the string yarn 33 is pressed by the pressing surface 24a using the moving operation of the yarn introduction tube 11 when the cake 28 is formed. As a result, the string 33 can be eliminated. Further, when the pressing member is provided on the bobbin 25, the string yarn 33 is extinguished by pressing the string yarn 33 with the pressing surface using the moving operation of the bobbin 25 when the bobbin 25 is advanced into the pot 12. Can be made. For this reason, when the pressing member is provided on at least one of the yarn introduction tube 11 and the bobbin 25, the string yarn 33 is reduced without substantially reducing the productivity of pot spinning compared to the case where the pressing member is provided in the lifting mechanism. There is an advantage that it can be extinguished.

  1 pot spinning machine, 11 yarn introduction tube, 12 pots, 18 yarns, 22 inner wall, 24 pressing member, 24a pressing surface, 25 bobbins, 28 cakes, 33 string yarns.

Claims (5)

The pot is rotated with the yarn introduction tube inserted into the pot, and the yarn to be discharged from one end of the yarn introduction tube is moved by moving the yarn introduction tube in the central axis direction of the pot. A pot fine spinning comprising: a cake forming step of winding around an inner wall to form a cake; and a rewinding step of causing a bobbin to advance into the pot and rewinding the yarn forming the cake from the inner wall of the pot to the bobbin. A method,
During or after the formation of the cake, the string thread that is separated from the inner wall of the pot and is present in the space in the pot is pressed by the pressing surface of the pressing member in the direction of the central axis of the pot and disappears. Method. The pot is rotated with the yarn introduction tube inserted into the pot, and the yarn to be discharged from one end of the yarn introduction tube is moved by moving the yarn introduction tube in the central axis direction of the pot. A pot spinning machine that wraps around an inner wall to form a cake,
During or after the formation of the cake, a pressing member having a pressing surface that presses the string string away from the inner wall of the pot and exists in the space in the pot in the direction of the central axis of the pot and disappears. Spinning machine. 3. The pot spinning machine according to claim 2, wherein the pressing member is provided on the yarn introduction pipe, and the string yarn is pressed by the pressing surface using a moving operation of the yarn introduction pipe when the cake is formed. The pot spinning machine according to claim 2, wherein the pressing member is provided on the bobbin, and the string is pressed by the pressing surface using a moving operation of the bobbin when the bobbin is advanced into the pot. The pot spinning machine according to any one of claims 2 to 4, wherein the pressing surface is circular when viewed from a central axis direction of the pot.

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