JP2009242094A - Tension sensor and automatic winder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately measure the tension of thread in a stable state with simple structure without increasing the number of components of an automatic winder. <P>SOLUTION: A tension sensor 30 comprises a tension detecting part 31a detecting the tension of the thread unwound from a thread supply bobbin 12 and wound on a package P; an upstream thread support member 35 supporting the thread in a thread reeling passage Y upstream of the tension detecting part 31a; and a downstream thread support member 33 supporting the thread in the thread reeling passage Y downstream of the tension detecting part 31a. The tension sensor 30 is formed to bring the thread into contact with the tension detecting part 31a at a predetermined angle. The upstream thread supporting member 35 and the downstream thread support member 33 come in contact with the thread from opposite sides to each other with respect to the thread reeling passage Y. The thread can thereby be led into the thread reeling passage Y without forming the upstream thread support member 35 and the downstream thread support member 33 as movable components. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tension sensor that measures the tension of a yarn that is unwound from a bobbin and wound around a package, and an automatic winder that includes the tension sensor.

  There is an automatic winder that rewinds a bobbin produced by a spinning machine or the like to form a package of a predetermined shape. For example, as shown in Patent Document 1, an automatic winder is a tensioner that gives an appropriate tension to a bobbin unwound yarn, a slab catcher that detects a defect of the yarn, a splicer that joins the yarn end when the yarn breaks or the yarn is cut by the slab catcher. (Yarn joining device), and a traverse drum that rotates the package at high speed by frictional contact.

  The automatic winder shown in Patent Document 1 includes a tension sensor that measures the tension of a yarn unwound from a bobbin and wound around a package. According to such a tension sensor, even if an unexpected tension fluctuation occurs in the yarn being wound, this can be detected. Therefore, the operation of the tensioner and the traverse drum can be adjusted based on the detected tension fluctuation, and occurrence of yarn breakage and winding shape defect due to tension fluctuation during winding can be avoided.

By the way, in the tension sensor as described above, in order to accurately measure the yarn tension in a stable state, it is necessary to bring the yarn into contact with the tension detector in a predetermined state. As a structure for this purpose, as shown in Patent Document 2, a thread is supported at a total of three points, the tension detection part of the tension sensor and the upstream side and the downstream side of the tension detection part, and a predetermined angle is formed with respect to the tension detection part. A so-called three-point support structure in which the yarn is brought into contact with each other in such a state is employed.
JP-A-10-87175 JP 2001-11740 A

  The three-point support structure provided in the tension sensor described in Patent Document 2 includes guide members that respectively support yarns on the upstream and downstream yarn paths of the tension detection unit. However, when the yarn is introduced into the tension detecting portion, the yarn cannot be introduced unless these guide members are temporarily retracted from the yarn support position. Therefore, the guide member is rotatably attached to the tension sensor main body, and a mechanism for rotating the guide member is provided. As described above, the conventional three-point support structure requires a movable part and a mechanism for moving the movable part. For this reason, the number of parts of the tension sensor or the automatic winder increases, resulting in a complicated structure.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a tension sensor capable of accurately measuring a yarn tension in a stable state without increasing the number of parts of an automatic winder with a simple structure. And providing an automatic winder including the tension sensor.

  In order to solve the above problems, a tension sensor according to the present invention includes a tension detection unit that detects the tension of a yarn, and a yarn path upstream of the tension detection unit, and contacts the yarn from one side with respect to the yarn path. An upstream-side yarn support member that supports the yarn, and a downstream side that supports the yarn by contacting the yarn from the other side opposite to the one side by a yarn path on the downstream side of the tension detection unit A yarn support member, and the yarn is in contact with the tension detector at a predetermined angle by the support of the upstream yarn support member and the downstream yarn support member.

  In the tension sensor yarn support structure described in Patent Document 2 as the prior art, the support members that support the yarn contact the yarn from the same side with respect to the yarn path on the upstream side and the downstream side of the tension detection unit. It was a structure. However, in this structure, if the support member is not a movable part, it is not possible to hang the yarn over the tension detection unit and the three points of the upstream and downstream support members. On the other hand, the tension sensor according to the present invention employs a structure in which the upstream yarn support member and the downstream yarn support member come into contact with the yarn from the side opposite to the yarn path. As a result, even if the upstream yarn support member and the downstream yarn support member are not movable parts, the tension detection unit and the upstream yarn support member and the downstream yarn support member can be threaded over three points. It becomes possible to introduce the yarn into the detection unit. Therefore, the structure of the upstream yarn support member and the downstream yarn support member can be simplified, so that the yarn tension can be accurately measured in a stable state without complicating the device structure and increasing the number of parts. become able to.

  As one embodiment of the tension sensor according to the present invention, the upstream yarn support member and the downstream yarn support member are fixed in a state where the surfaces thereof are orthogonal to the yarn path, and guide the yarn introduced into the tension detection unit. You may make it provide the thread | yarn guide part for doing. Further, a yarn guide path through which the yarn introduced to the tension detecting unit passes may be formed by the yarn guide portion of the upstream yarn support member and the yarn guide portion of the downstream yarn support member. In this case, it is desirable that the yarn guide path has a shape in which the width dimension gradually decreases from the side of the yarn path toward the yarn path. According to this, it is possible to reliably guide the yarn introduced into the tension detection unit while having a simple structure with a reduced number of parts.

  An automatic winder according to the present invention is an automatic winder in which a plurality of winding units each having a tension sensor having the above-described configuration are arranged, and a yarn guide formed by an upstream yarn support member and a downstream yarn support member. The path is characterized by opening on the front side of the winding unit. In this automatic winder, the winding unit may be provided with a yarn joining device having a yarn feeding lever, and the tension sensor may be arranged close to the upper or lower portion of the yarn joining device. According to this automatic winder, the number of parts can be reduced, and the yarn can be introduced into the tension detection unit during the splicing operation while simplifying the structure, reducing the cost, and facilitating maintenance. This makes it possible to accurately measure the yarn tension in a stable state.

  According to the tension sensor and the automatic winder according to the present invention, the tension of the yarn can be accurately measured in a stable state without increasing the number of parts with a simple structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a winding unit 1 of an automatic winder according to an embodiment of the present invention. The winding unit 1 is provided with a yarn feeding bobbin 12 inserted into the yarn feeding unit 11 at the lower part and a winding device 13 for winding the yarn unwound from the yarn feeding bobbin 12 around the package P at the upper part. Configured. The winding device 13 makes the traverse drum 14 that rotates by the driving force of a motor (not shown) and the package P contact the traverse drum 14 with an appropriate contact pressure, and rotatably supports the package P in that state. And a cradle 15. A traverse groove 16 is formed on the circumferential surface of the traverse drum 14. In the winding device 13, by rotating the traverse drum 14, the yarn can be wound around the package P while being traversed with an appropriate width. Thereby, the yarn of the yarn supplying bobbin 12 is unwound upward and wound around the package P.

  Between the winding device 13 and the yarn feeding bobbin 12, the yarn clearer 18, the cutter 28, the splicer (yarn splicing device) 20, the tension sensor 30, the gate type tensioner 26, in order from the upper side to the lower side along the yarn path Y. A yarn unwinding assisting device 29 is provided. Further, a relay pipe 22 and a suction mouth 24 for performing the yarn splicing work are provided. The yarn clearer 18 is a device for finding a defective yarn portion such as a slab during winding of the yarn. The splicer 20 is a device for joining the yarn ends of the upper yarn of the package P side and the lower yarn of the yarn feeding bobbin 12 when the yarn breaks. The tension sensor 30 is a device for measuring the tension of the yarn being wound, although its detailed configuration and function will be described later. The gate type tensioner 26 is provided with a pair of gates composed of a comb-like fixed gate and a movable gate. The pair of gates holds the yarn on the yarn path Y in a zigzag shape so that a predetermined tension is applied to the traveling yarn. Is a device that gives When the yarn clearer 18 finds a defective portion of the yarn, the cutter 28 cuts the upstream yarn in the yarn conveyance direction of the defective portion. The yarn unwinding assisting device 29 includes a cylindrical member disposed above the yarn supplying bobbin 12 and controls a balloon of yarn to be unwound from the yarn supplying bobbin 12.

  A splicer guide plate (splicer yarn guide) 21 for guiding the yarn to the splicer 20 is installed at the lower end of the splicer 20. A tensor guide plate (tensor yarn guide) 27 for guiding the yarn to the gate type tensioner 26 is installed at the upper end of the gate type tensioner 26. Each of the splicer guide plate 21 and the tensor guide plate 27 is composed of a flat plate whose surface is arranged perpendicular to the yarn path Y, and a substantially U-shaped guide groove 21a for guiding the yarn to the flat plate. 27a is provided. The tension sensor 30 is installed below the splicer 20 and directly above the gate type tensioner 26, and is placed on the upper surface of the tensioner guide plate 27.

  The suction mouse 24 is configured to be pivotable in the vertical direction about a fulcrum A located at a height near the splicer 20, and a suction port 24a is provided at the pivot end. Thereby, the suction port 24a can be rotated from the lower part of the splicer 20 to the upper part of the traverse drum 14. On the other hand, the relay pipe 22 is configured to be pivotable in the vertical direction around a fulcrum B located at a height position between the gate type tensioner 26 and the splicer 20, and a suction port 22a is provided at the pivot end. It has been. As a result, the suction port 22a is rotatable to the lower part of the gate type tensioner 26, specifically, between the gate type tensioner 26 and the yarn unwinding assisting device 29, to the upper part of the splicer 20.

  When the yarn is cut by the cutter 28, the yarn end of the upper yarn of the package P side is sucked by the suction port 24a of the suction mouth 24 arranged immediately below the traverse drum 14. In this state, the suction mouth 24 rotates downward, so that the yarn end of the upper thread is delivered to the splicer 20. On the other hand, the yarn end of the lower yarn on the yarn feeding bobbin 12 side is sucked by the suction port 22a of the relay pipe 22 arranged at the lower part of the gate type tensioner 26. In this state, the suction port 22a of the relay pipe 22 rotates upward, so that the yarn end of the lower yarn is delivered to the splicer 20. Thus, the upper thread and the lower thread are spliced together by the splicer 20.

  2 is a perspective view showing the external configuration of the tension sensor 30, FIG. 3 is a schematic cross-sectional view in plan view showing the internal configuration of the tension sensor 30, and FIG. 4 is a front view of the tension sensor (as viewed from arrow C in FIG. 3). FIG. 5 is a plan view of the tension sensor. In FIG. 4, a part of the tension sensor 30 is shown in cross section. FIG. 2 also shows a tensioner guide plate 27 (see FIG. 1) installed on the lower surface side of the tension sensor 30. In the following description, the right side and the left side refer to the right side and the left side as viewed from the front of the tension sensor 30.

  As shown in FIG. 2, the tension sensor 30 includes a substantially rod-shaped rod 31. The rod 31 is arranged so that its axial direction is orthogonal to the yarn path Y. On the side surface of the rod 31, a tension detector 31a for detecting the tension of the yarn is provided. The tension detector 31a has a shape in which the peripheral surface of the rod 31 is recessed, and is made of a material such as ceramic that has low contact frictional resistance against yarn and less wear.

  Above the rod 31, a downstream yarn support member 33 that contacts and supports the yarn on the downstream yarn path Y is installed. Below the rod 31, the upstream yarn path Y is on the downstream side. An upstream-side yarn support member 35 that contacts the yarn on the yarn path Y in the opposite direction to the yarn support member 33 and supports the yarn is installed. As shown in FIGS. 2 and 4, each of the downstream yarn support member 33 and the upstream yarn support member 35 is formed of a flat plate member whose surface is perpendicular to the yarn path Y, and the ends thereof. Groove-shaped yarn support portions 33a and 35a are formed in the portion facing the yarn path Y on the side. Ceramic yarn guides 34 and 36 (see FIG. 4) that come into contact with the yarn are installed on the yarn support portions 33a and 35a. The yarn support portion 33a of the downstream yarn support member 33 is disposed so as to contact the yarn on the yarn path Y from the right side, and the yarn support portion 35a of the upstream yarn support member 35 is arranged on the yarn path Y from the left side. It is arrange | positioned so that it may contact.

  With this configuration, the yarn on the yarn path Y is obtained by contacting the contact point S of the yarn guide 34 provided in the downstream yarn support member 33, the contact point Q of the yarn guide 36 provided in the upstream yarn support member 35, and the tension provided by the rod 31. It is supported at three points with the contact point R of the detector 31a. When viewed from the front of the tension sensor 30, the line connecting the three points S, Q, and R is bent at a predetermined angle at the contact point R of the tension detector 31a, as shown in FIG. As a result, the yarn on the yarn path Y comes into contact with the tension detector 31a in a state of being wound at a predetermined angle (an angle θ described later).

  FIG. 6 is a schematic diagram for explaining a yarn support state by the tension sensor 30. As shown in the figure, the contact point S of the downstream yarn support member 33 and the contact point R of the tension detector 31a are arranged on the same vertical line, and the contact point Q of the upstream yarn support member 35 is the contact point. It is arranged slightly to the right of S and R. Further, the yarn path Y of the yarn supported at the contact points S and R is arranged slightly to the left with respect to the original yarn path Y ′ connecting the yarn inlet of the yarn clearer 18 and the yarn outlet of the gate type tensioner 26. Has been. Accordingly, the yarn upstream of the contact points S and R is inclined by an angle α (for example, α = 0.3 degrees) with respect to the vertical direction. Further, the yarn supported at the contact points S, Q, and R comes into contact with the contact point R of the tension detection unit 31a in a state of being wound at an angle θ (for example, θ = 10 degrees). Further, the three-point support at the contact points S, Q, and R makes it possible to always keep the contact angle θ of the yarn with respect to the tension detecting portion 31a constant.

  Further, as shown in FIG. 2, the downstream yarn support member 33 and the upstream yarn support member 35 are formed with yarn guide portions 33b and 35b for guiding the yarn introduced into the tension detection portion 31a. . The yarn guide portions 33b and 35b are formed of an inclined side formed on the near side at the same end side as the yarn support portions 33a and 35a. The yarn guide portion 33b of the downstream yarn support member 33 has an inclined side toward the right side as it is separated from the yarn path Y, and the guide portion 35b of the upstream yarn support member 35 is separated from the yarn route Y. The slope is on the left side. A yarn guide path 38 through which the yarn introduced into the tension detecting portion 31a passes is formed between the yarn guide portion 35b of the upstream yarn support member 35 and the yarn guide portion 33b of the downstream yarn support member 33. ing. As shown in FIG. 5, the yarn guide path 38 is open to the front side of the winding unit 1 in a plan view, and from the front side to the back side in the yarn introduction direction, that is, the front side of the yarn path Y. The width gradually becomes narrower from the direction toward the yarn path Y. As shown in FIG. 2, the guide groove 27 a of the tensor guide plate 27 is formed in an inclined side shape that is continuous with the entrance of the yarn guide path 38.

  In addition, a guide member 37 for guiding the yarn introduced into the tension detector 31a is installed at the tip of the rod 31. On the side surface at the tip of the guide member 37, a planar guide portion 37a having the same inclination as the yarn guide portion 33b of the downstream yarn support member 33 in plan view is formed. The guide part 37a guides the yarn introduced into the yarn path Y at the same height position as the tension detection part 31a.

  As shown in FIG. 3, a metal block (strain generating body) 42 to which a resistance element (strain gauge) 42 a is attached is installed in the main body cover 41 of the tension sensor 30. The metal block 42 has a substantially rectangular parallelepiped shape, and its longitudinal direction is arranged in parallel with the axial direction of the rod 31. One side surface is fixed to the support member 44 of the tension sensor 30, and the other side surface faces the side surface. Are connected at right angles to the base side end of the rod 31 through the connecting body 46. The resistance element 42a is integrally formed on the side surface of the metal block 42 by, for example, printing. With the above configuration, when the rod 31 is displaced in the direction orthogonal to the axis by the yarn of the yarn path Y coming into contact with the tension detection unit 31a, distortion is generated in the longitudinal direction of the metal block 42. The resistance element 42a senses this distortion and outputs a detection signal (voltage) corresponding to the amount of distortion.

  As shown in FIG. 1, the tension sensor 30 is connected to a controller (control unit) 50 of the winding unit 1. Based on the tension value input from the tension sensor 30, the controller 50 operates a drive unit (not shown) of the gate type tensioner 26 and performs feedback control to an optimum winding tension without yarn breakage. In order to adjust the winding tension, in addition to controlling the operation of the gate type tensioner 26, an operation signal is output from the controller 50 to the drive motor of the traverse drum 14, and the number of rotations is controlled, whereby the package is controlled. The peripheral speed of P may be changed. The controller 50 has a monitoring function of monitoring the winding tension value from the tension sensor 30 and generating an alarm signal when an abnormal tension value is detected. When an alarm signal is generated, winding is stopped by the controller 50. Alternatively, an alarm signal may be sent to a quality control device for a package P (not shown), and this device may store that a package failure has occurred. Furthermore, when an abnormal tension value is input from the tension sensor 30, the controller 50 can output an operation signal to the yarn clearer 18, and the yarn clearer 18 can remove the yarn at that location.

  In the winding unit 1, when performing splicing with the splicer 20, the relay pipe 22 conveys the lower thread to the splicer 20, so that the lower thread is introduced into the tension detection unit 31 a of the tension sensor 30. It has become. That is, when the relay pipe 22 rotates upward in a state where the end of the lower thread is sucked, the lower thread enters the thread guide path 38 from the front side of the tension sensor 30. At this time, even when the lower thread swings left and right, the lower thread is guided to the yarn path Y through the thread guide path 38 by being guided by the thread guide portions 33b and 35b. Thus, the lower thread is arranged on the yarn path Y, and is supported at three points: the contact point S of the downstream yarn support member 33, the contact point Q of the upstream yarn support member 35, and the contact point R of the tension detector 31a. It will be in the state. Further, the splicer 20 is provided with a yarn shifting lever 20a for bringing the upper yarn and the lower yarn to the yarn joining operation position in order to perform the yarn joining operation reliably. During the yarn joining operation, the yarn shifting lever 20a reliably introduces the upper yarn and the lower yarn into the yarn joining operation position of the splicer 20, but introduces the yarn into the tension sensor 30 disposed near the splicer 20. Is also reliably performed by the yarn shifting lever 20a.

  As described above, the tension sensor 30 according to the present embodiment employs a structure in which the upstream yarn support member 35 and the downstream yarn support member 33 are in contact with the yarn from the side opposite to the yarn path Y. . As a result, even if the upstream-side yarn support member 35 and the downstream-side yarn support member 33 are not used as movable parts, the yarn is bridged between the tension detection unit 31a and the upstream-side yarn support member 35 and the downstream-side yarn support member 33. Thus, it is possible to introduce the yarn into the tension detecting unit 31a. Therefore, the structure of the upstream thread support member 35 and the downstream thread support member 33 can be simplified, and the tension of the thread is stabilized without complicating the structure of the automatic winder 1 and increasing the number of parts. It becomes possible to measure accurately.

  Further, in the tension sensor 30, the upstream side thread support member 35 and the downstream side thread support member 33 are formed of a flat plate member whose surfaces are fixed in a state orthogonal to the yarn path, and are introduced into the tension detection unit 31a. Yarn guide portions 35b and 33b for guiding the yarn are provided. A yarn guide path 38 through which the yarn introduced into the tension detector 31a passes is formed between the yarn guides 35b and 33b. The yarn guide path 38 has a shape in which the width dimension gradually decreases from the side (front side) of the yarn path Y toward the yarn path Y. By adopting such a configuration, the upstream yarn support member 35 and the downstream yarn support member 33 have a simple structure having no movable parts, but can reliably introduce the yarn into the tension detection unit 31a. .

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims, the specification, and the drawings. Is possible. It should be noted that any shape, structure, and material not directly described in the specification and drawings are within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited.

  For example, the specific arrangement of the upstream-side yarn support member 35 or the downstream-side yarn support member 33 is an example, and the height and the left-right arrangement with respect to the tension detection unit 31a can be set other than the above. The installation position of the tension sensor 30 in the winding unit 1 is also an example, and the tension sensor 30 may be a position where the tension of the yarn unwound from the yarn feeding bobbin 12 and wound on the package P can be detected. For example, you may install in another position.

It is the schematic which shows the winding unit of the automatic winder concerning one Embodiment of this invention. It is a perspective view which shows the external appearance structure of a tension sensor. It is a schematic sectional drawing of planar view which shows the internal structure of a tension sensor. It is a front view (C arrow view of FIG. 3) of a tension sensor. It is a top view of a tension sensor. It is the schematic for demonstrating the thread | yarn support state by a tension sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding unit 11 Yarn feeding part 12 Yarn feeding bobbin 13 Winding device 14 Traverse drum 15 Cradle 16 Traverse groove 18 Yarn clearer 20 Splicer (yarn splicing device)
20a Thread Lever 21 Splicer Guide Plate 22 Relay Pipe 24 Suction Mouth 26 Gate Tensor 27 Tensor Guide Plate 28 Cutter 29 Thread Unwinding Auxiliary Device 30 Tension Sensor 31 Rod 31a Tension Detector 33 Downstream Thread Support Member 33a Thread Support Part 33b Guide part 34 Yarn guide 35 Upstream side thread support member 35a Yarn support part 35b Yarn guide part 36 Yarn guide 37 Guide member 37a Guide part 38 Thread guide path 41 Main body cover 42a Resistance element 42 Metal block 44 Support member 46 Coupled body 50 controller

Claims (5)

A tension detector for detecting the tension of the yarn;
An upstream yarn support member that supports the yarn by contacting the yarn from one side with respect to the yarn path at the upstream yarn path of the tension detection unit;
A downstream yarn support member that supports the yarn by contacting the yarn from the other side facing the one side on the downstream side of the tension detection unit;
With
The tension sensor according to claim 1, wherein the yarn contacts with the tension detecting unit at a predetermined angle by the support of the upstream yarn support member and the downstream yarn support member.   The upstream side thread support member and the downstream side thread support member have their surfaces fixed perpendicular to the yarn path, and each support member is used to guide a thread introduced into the tension detection unit. The tension sensor according to claim 1, further comprising a yarn guide portion. The yarn guide path of the upstream yarn support member and the yarn guide portion of the downstream yarn support member form a yarn guide path through which the yarn introduced to the tension detection unit passes,
The tension sensor according to claim 2, wherein the yarn guide path has a shape in which a width dimension gradually decreases from a side of the yarn path toward the yarn path. An automatic winder in which a plurality of winding units including the tension sensor according to any one of claims 1 to 3 are arranged,
An automatic winder characterized in that a yarn guide path formed by the upstream yarn support member and the downstream yarn support member is open to the front side of the winding unit. The winding unit includes a yarn joining device having a yarn gathering lever,
The automatic winder according to claim 4, wherein the tension sensor is disposed close to or above the yarn joining device.

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