JP2010008293A - Displacement amount detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement amount detection device, in which detection values of a linear sensor can be promptly stabilized after removing a disturbance even when a step-functional disturbance is added to an external force acting on moving parts by shortening a free vibration damping period for flat springs to return to a stable state from a vibrational state, and therefore detection accuracy is excellent. <P>SOLUTION: The displacement amount detection device has a fixing part 16 equipped with a linear sensor 40 and a movable part 17 attached to the fixing part 16 through a pair of flat springs 18, 18 and detects a displacement amount of the movable part 17 by the linear sensor 40, in which a resin block body 45 with a shock-absorbing function is disposed between both flat springs 18, 18 in a state contacting with both flat springs 18, 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a displacement detection device that includes a fixed part having a linear sensor and a movable part attached to the fixed part via an elastic part, and detects a displacement amount of the movable part by a linear sensor.

  In a drawing false twisting machine, a tension measuring device arranged to measure the tension of a thread running between two guide rollers is known from Patent Document 1. The tension measuring device there is constituted by an apparatus main body as a fixing part, a guide part of a thread body, an elastic plate for connecting a support shaft of the guide part to the apparatus main body, and the like. The guide part is arranged on the same plane as the two guide rollers and so as to deviate from a straight line connecting the two guide rollers, and the yarn body is bent at a contact portion with the guide part. In this contact portion, the guide portion is a pressing force obtained by combining the tension applied in the upstream direction of the yarn body and the tension applied in the downstream direction of the yarn body, in other words, the yarn body returns from the bent state to the linear state. Receive the return force to try. When the guide portion receives the return force in this way, distortion occurs in the elastic plate connected to the guide portion according to the magnitude of the return force, and by measuring the amount of distortion of the elastic plate, the yarn is The tension applied to the body can be determined.

  Apart from this, the inventor has already developed a tension measuring device using a linear sensor as a detection element. FIG. 5 shows such a tension measuring device. This tension measuring device is fixed to a fixed portion 16 having a linear sensor 40, a pair of leaf springs 18 and 18 extended from the fixed portion 16 in a cantilever manner, and free ends of the leaf springs 18 and 18. And a movable portion 17. The movable portion 17 is provided with a guide portion 31 in contact with the yarn body Y. The linear sensor 40 includes a cylindrical sensor head 41 and a sensor rod 42 inserted into the sensor head 41, and the sensor head 41 detects the displacement amount of the sensor rod 42 due to the displacement of the movable portion 17. The tension of the yarn body Y can be measured.

Japanese Patent Laid-Open No. 10-38722

  However, in the tension measuring apparatus as shown in FIG. 5 described above, when a step function disturbance is applied to the external force, the measured value becomes unstable for a long time after the disturbance is removed. That is, when the external force temporarily increases due to a disturbance, the movable portion 17 supported by the leaf spring 18 vibrates for a long time, and this vibration is left to free vibration attenuation of the leaf spring 18. There is a problem that it takes time for the detection value to stabilize (see FIG. 4A). As described above, the detection value becoming unstable for a long time means that accurate measurement of the tension is impossible during the vibration period, and as a result, the measurement accuracy of the tension is lowered. As a step function disturbance factor in the yarn tension measuring device, a yarn defect such as a yarn knot in which the yarn body Y is partially thickened can be mentioned.

  The present invention has been made in view of the above-described problems. By reducing the free vibration damping time required for the leaf spring to return from the vibration state to the stable state, the external force acting on the movable portion is achieved. It is possible to stabilize the detection value of the linear sensor at an early stage after the disturbance has passed even if a step function disturbance is applied to the disturbance. Therefore, an object of the present invention is to obtain a displacement detection device with excellent detection accuracy. To do.

  The displacement amount detection device according to the present invention includes a fixed portion having a linear sensor and a movable portion attached to the fixed portion via an elastic portion, and detects the displacement amount of the movable portion by the linear sensor. The elastic portions are a pair of leaf springs arranged in parallel at a predetermined interval, and these leaf springs extend from the fixed portion in a cantilever manner. A resinous block body having an impact absorbing function is disposed between both leaf springs so as to be in contact with both leaf springs.

  The block body can take the form arrange | positioned in the state of compression deformation between both leaf | plate springs.

  The movable part has a guide part in contact with the yarn body traveling from the upstream side toward the downstream side. The guide body travels in a state in which the thread body is bent, and a restoring force is applied to the guide section so as to return from the bent posture state to the linear posture state. ing. By detecting the amount of displacement of the movable part derived from the restoring force of the yarn body with a linear sensor, the tension of the yarn body can be measured.

  In the present invention, since the resinous block body is disposed between the pair of leaf springs connecting the movable portion to the fixed portion, the plate spring vibrates due to a step function disturbance applied to the external force acting on the movable portion. However, the vibration can be absorbed by the block body and attenuated early. That is, according to the present invention, after the disturbance has passed, the detection value of the linear sensor can be stabilized at an early stage by the shock absorbing function of the block body, and the detection accuracy of the displacement detection device can be improved. . Moreover, since it is a simple structure which only arrange | positions a block body between leaf | plate springs, it is also easy to retrofit to the existing displacement amount detection apparatus using a leaf | plate spring.

  Since the block body is disposed between the leaf springs in a state of being compressed and deformed, it is possible to prevent the block body from being displaced due to friction between the block body and the leaf springs or coming off from between the leaf springs. That is, since the block body can be held between the leaf springs without using a fixing means such as an adhesive, labor and cost required for assembling the displacement detection device can be reduced.

  When each of the displacement detection devices described above is used as a means for measuring the tension of the thread body, even if the yarn annulus passes through the guide portion and the leaf spring vibrates, the vibration is quickly attenuated by the shock absorbing function of the block body. To do. Therefore, since the detection value of the linear sensor is stabilized early after the thread has passed, the measurement accuracy of the tension is greatly improved.

(Embodiment) FIGS. 1 to 4 show an embodiment in which the displacement measuring device of the present invention is applied to an automatic winder yarn tension measuring device (hereinafter simply referred to as a measuring device). As shown in FIG. 2, the automatic winder is a device that pulls out a yarn body (hereinafter simply referred to as a yarn) Y wound around a spinning bobbin 1 and winds it around a package 2. An auxiliary unit 3, a tension applying unit 4, a yarn joining unit 5, a yarn defect detecting unit 6, a driving drum 7 and the like are disposed. When the package 2 rotates by receiving the rotational power of the drive drum 7, the yarn Y of the fine spinning bobbin 1 is drawn out and wound on the package 2. Further, the drive drum 7 has a traverse groove on its peripheral surface, and can traverse the yarn Y wound around the package 2.

  When the yarn Y of the spinning bobbin 1 is reduced and replaced with a new one, or when a defect is found in the yarn Y in the yarn defect detection unit 6 and the portion is cut, A yarn splicing process for joining the yarns Y on the bobbin 1 side and the package 2 side is performed. Specifically, the yarn joining section 5 includes a yarn joining section main body 10, a lower thread suction guide member 11 for guiding the yarn Y on the spinning bobbin 1 side to the yarn joining section main body 10, and the yarn Y on the package 2 side. An upper thread suction guide member 12 that leads to the joint main body 10 is provided.

  A measuring device 15 is disposed downstream of the tension applying unit 4 in the traveling direction of the yarn Y. As shown in FIGS. 1 and 3, the measuring device 15 includes a fixed portion 16 fixed to a vertical wall surface, and a pair of front and rear leaf springs 18 and 18 extended from the fixed portion 16 in a cantilever manner. And a movable portion 17 fixed to the free ends of the two leaf springs 18. A pair of leaf | plate springs 18 and 18 are arrange | positioned so that a predetermined space | interval may be put in parallel and orthogonal to the front-back direction. In FIGS. 1 and 3, for convenience of explanation, the directions shown in the drawings are defined as the front-rear direction and the left-right direction.

  The fixed portion 16 includes a T-shaped base portion 21 in front view, a head support portion 22 formed to protrude toward the front of the base portion 21, and leaf springs 18 and 18 fixed to the rear end of the base portion 21. The upper and lower portions of the front end portion of the base portion 21 are fixed to the wall surface with screws 24 and 24. A sensor head 41 of a linear sensor 40 described later is fixed to the head support portion 22. The movable portion 17 is provided on a roller-shaped guide portion 31 that is in contact with the yarn Y, a support shaft 32 that rotatably supports the guide portion 31, a connecting portion 33 of the leaf springs 18 and 18, and a front side of the connecting portion 33. Rod support portion 34. A sensor rod 42 of the linear sensor 40 is fixed to the front surface of the rod support portion 34.

  The connecting portion 23 on the fixed portion 16 side is disposed at the right end portion of the opposing space of the leaf springs 18, 18, and includes an intermediate block 26 that sandwiches the front leaf spring 18 between the rear end surface of the base portion 21 and the intermediate block 26. A pressing plate 28 that holds the rear leaf spring 18 between the rear surface of the block 26 is provided. The left and right width dimensions of the rear end portion of the base portion 21, the intermediate block 26, and the pressing plate 28 are set to be equal (see FIG. 3). The connecting portion 33 on the movable portion 17 side is disposed between the intermediate block 36 having the same shape as the intermediate block 26 on the fixed portion 16 side and the front surface of the intermediate block 36, which is disposed at the left end portion of the opposed space between the leaf springs 18 A front clamping piece 37 that sandwiches the front leaf spring 18 and a rear clamping piece 38 that sandwiches the rear leaf spring 18 between the rear surface of the intermediate block 36 are provided. The left and right width dimensions of the intermediate block 36 and the front and rear clamping pieces 37 and 38 are set equal. A support shaft 32 is integrally provided on the left surface of the intermediate block 36, and a rod support portion 34 is integrally provided on the front side of the front clamping piece 37.

  On the fixed portion 16 side, the leaf springs 18, 18, the base portion 21, and the connecting portion 23 can be integrated with two screws 29 and 29. Specifically, by screwing screws 29 and 29 from the rear surface side of the pressing plate 28 to the base portion 21 via the intermediate block 26 and the leaf springs 18 and 18, the leaf spring 18 is cantilevered to the fixed portion 16. It is fixed to the shape. Similarly, on the movable portion 17 side, the connecting portion 33 can be fixed to the leaf springs 18 and 18 by using two screws 39 and 39. Specifically, by screwing the screws 39 and 39 from the rear surface side of the rear clamping piece 38 to the front clamping piece 37 through the intermediate block 36 and the leaf springs 18 and 18, the movable portion 17 is attached to the leaf spring 18. It is fixed. As shown in FIG. 1, the center part in the left-right direction on the front surface of the front plate spring 18 and the center part in the left-right direction on the rear surface of the rear plate spring 18 are exposed, and the plate springs 18, 18 are The right end portion can be bent and deformed back and forth, with the left end portion as the free end side.

  The guide portion 31 is arranged in the same plane as two guide rollers (not shown) adjacent to the guide portion 31 in the traveling direction of the yarn Y, and is deviated from a straight line connecting the two guide rollers. Is bent at the contact portion with the guide portion 31. In this contact portion, the guide portion 31 has a forward pressing force obtained by combining the tension applied in the upstream direction of the yarn Y and the tension applied in the downstream direction of the yarn Y, in other words, the yarn Y returns from the bent state to the linear state. Receive the return force to try. On the other hand, the pair of leaf springs 18 and 18 gives the movable portion 17 a biasing force in a direction opposite to the return force that the yarn Y applies to the movable portion 17, that is, a backward force.

  When the guide portion 31 receives a forward restoring force from the yarn Y, the entire movable portion 17 is displaced forward relative to the fixed portion 16 according to the magnitude of the restoring force, as indicated by an imaginary line in FIG. To do. By detecting this amount of displacement by the linear sensor 40 provided in the fixed portion 16, the tension of the yarn Y can be measured. The linear sensor 40 includes a cylindrical sensor head 41 fixed to the head support portion 22 and a round bar-shaped sensor rod 42 inserted into the sensor head 41. The sensor rod 42 has a rear end portion fixed to the rod support portion 34 and is displaced integrally with the movable portion 17. Therefore, the detection value of the displacement amount of the sensor rod 42 by the sensor head 41 is fixed. This is the amount of displacement of the movable part 17 with respect to the part 16. As shown in FIG. 2, the detection value by the sensor head 41 is input to the control unit 43 via an arbitrary transmission unit. Based on the input value, the control unit 43 performs control to increase or decrease the tension applied to the yarn Y by the tension applying unit 4 so as to approach the optimum value, and when the input value exceeds the allowable range, the control unit 43 controls the drive drum 7. Performs emergency stop control.

  In addition, the measuring device 15 according to the present embodiment is characterized in that a resinous block body 45 having an impact absorbing function is disposed between the pair of leaf springs 18 and 18. The block body 45 is formed into a rectangular parallelepiped shape using a soft rubber such as “Solbo S” of Sanshin Kosan Co., Ltd. as a material. The front-rear dimension of the block body 45 is set to be larger than the opposing spacing dimension of the leaf springs 18, 18, and the left-right dimension is set to be larger than the opposing spacing dimension of the intermediate blocks 26, 36 of the connecting portions 23, 33. Accordingly, the block body 45 is disposed in contact with the leaf springs 18 and 18 and the intermediate blocks 26 and 36 and compressed and deformed in the front-rear direction and the left-right direction. In the present embodiment, the block body 45 is prevented from being inadvertently displaced in the vertical direction or coming off due to the friction that the block body 45 receives on the front, rear, left and right contact surfaces.

  As described above, when the shock absorbing block 45 is disposed between the leaf springs 18 and 18, the vibration of the leaf springs 18 and 18 when the thread Y of the yarn Y passes through the guide portion 31 is quickly attenuated. be able to. FIG. 4 shows a result of comparing the relationship between the passage of time and amplitude when vibration is applied to the leaf springs 18 and 18 depending on the presence or absence of the block body 45. FIG. 4A shows a conventional example (FIG. 5). (B) shows the case of this embodiment (FIGS. 1 and 3). When both are compared, initially the same amount of amplitude A is shown, but in (b) the amplitude immediately decreases, and the decay time Tb is much shorter than the decay time Ta in (a). That is, in this embodiment, the vibration of the movable portion 17 is attenuated at an early stage by the shock absorbing function of the block body 45, so that the detection value by the linear sensor 40, that is, the measured value of the tension is stabilized at an early stage after the yarn has passed. It can be made.

  In addition to the above, two or more block bodies 45 may be arranged adjacent to each other in the vertical direction or the horizontal direction. The displacement amount detection device of the present invention can be applied to various measuring devices in addition to the yarn tension measuring device 15.

It is a perspective view of the displacement amount detection apparatus which concerns on embodiment of this invention. It is an equipment layout diagram of an automatic winder to which a displacement amount detection device is applied. It is a cross-sectional top view of a displacement amount detection apparatus. It is the figure which showed the relationship between time passage at the time of vibrating a leaf | plate spring, and an amplitude, (a) has shown the case of the prior art example, (b) has shown the case of embodiment, respectively. It is a cross-sectional top view of the principal part of the displacement amount detection apparatus which concerns on a prior art example.

Explanation of symbols

15 Displacement detection device (Thread tension measuring device)
16 fixed portion 17 movable portion 18 leaf spring 31 guide portion 40 linear sensor 45 block body Y thread body

Claims (3)

A displacement amount detection device that includes a fixed portion including a linear sensor and a movable portion attached to the fixed portion via an elastic portion, and detects a displacement amount of the movable portion by the linear sensor,
The elastic portion is a pair of leaf springs arranged in parallel at a predetermined interval, and these leaf springs are extended in a cantilever manner from the fixed portion,
A displacement detecting device, characterized in that a resin block having an impact absorbing function is disposed between both leaf springs in a state of being in contact with both leaf springs.   The displacement amount detection device according to claim 1, wherein the block body is disposed between both leaf springs in a compressed deformation state. The movable part has a guide part in contact with the yarn body traveling from the upstream side toward the downstream side,
The guide body travels in a state in which the thread body is bent, and a restoring force is applied to the guide section so as to return from the posture state in which the thread body is bent to a linear posture state. And
The tension of the yarn body can be measured by detecting the displacement amount of the movable part derived from the restoring force of the yarn body by the linear sensor. Displacement detection device.

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