JPH0678834U - Tension sensor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tension sensor capable of accurately measuring tension over a wide range near zero. [Constitution] Freely rotatable fulcrum A and force point B by the thread guide 6
And a point of action C to which the urging means 7 for counteracting its own rotation is connected.
And a rotation angle detection means 4 of the rotation member 5, and the weight of the rotation member 5 and the biasing force of the biasing means 7 in a state where the yarn is not caught on the yarn guide 6. It is a tension sensor that is adjusted to balance with.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a yarn tension sensor used for measuring untwisting tension of a draw false twisting machine using a belt type false twisting device or the like.

[0002]

[Prior art]

 First, the device configuration of a draw false twisting machine using a tension sensor will be described with reference to FIG. The filament yarn Y is drawn out from the yarn supply package P1 and introduced into the primary heater H1 from the first feed roller F1. The filament yarn Y discharged from the heater H1 enters the belt type false twisting device NT via the balloon control plate BC, further passes through the second feed roller F2, the secondary heater H2 and the third feed roller F3, and the winding package P2. Is formed into a roll. The twist formed by the belt type false twisting device NT propagates to the first feed roller F1 and is thermally fixed by the primary heater H1. That is, the upstream side of the belt type false twisting device NT is the twisting side, and the downstream side is the untwisting side. In the draw texturing machine, such a unit is regarded as one weight, and a large number of the weights are arranged in the thickness direction of the paper surface.

The draw false twisting machine using the belt type false twisting device NT can add a false twist having a high twist number at high speed, but needs to be monitored to maintain stable operation. For this monitoring, it is effective to install a tension sensor on the downstream side of the belt type false twisting device NT, measure the untwisting tension, and detect an abnormality when the untwisting tension deviates from a predetermined value. There was found.

For that purpose, it is necessary to dispose a tension sensor for each weight and adjust so that a predetermined tension value is output. As a conventional tension sensor for such a purpose, a pickup is provided between the input side thread guide and the output side thread guide, and the leaf spring or the like is deflected by the tension of the thread applied to the pick up. It is known that a displacement detector or a load cell detects the degree of. That is, the yarn is bent by a pickup positioned in the middle of the two-point yarn guide, and the force acting on the pickup according to the tension of the yarn is measured via a leaf spring or the like.

[0005]

[Problems to be solved by the device]

 A conventional tension sensor transmits a force acting on a pickup to a leaf spring or the like to detect a displacement of the leaf spring or the like, and therefore has a considerable rigidity to stabilize the initial posture of the leaf spring or the like. Therefore, it is difficult to measure the tension in a wide range including zero, for example, from 0 gram to 100 gram, and there is also a problem that it is necessary to replace the tension sensors having different leaf spring rigidity.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to provide a tension sensor capable of accurately measuring tension even in the vicinity of the zero point over a wide range. It is the one to be provided.

[0007]

[Means for Solving the Problems]

 The tension sensor of the present invention which achieves the above-mentioned object includes a rotary member having a rotatable fulcrum, a force point by a thread guide, and an action point to which a biasing means for counteracting the self-weight rotation is connected, and a rotation angle of the rotary member. It has a detecting means and is adjusted so that the self-weight rotational force of the rotating member and the urging force of the urging means are balanced in a state where the yarn is not hooked on the yarn guide.

[0008]

[Action]

 The reference posture of the rotary member is set by balancing the own-weight rotary force of the rotary member and the biasing force of the biasing means. When the yarn is applied to the yarn guide of the rotating member in this state, the yarn tension and the urging force increased by the rotation of the rotating member are balanced, and the yarn tension is measured by the rotation angle detecting means. Since the self-weight rotation force and the biasing force of the rotating member are balanced, the rotating member rotates even with a slight thread tension.

[0009]

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the internal structure of the tension sensor of the present invention, FIG. 2 is a sectional view of the tension sensor, and FIG. 3 is a side view of the tension sensor on the thread guide side.

In FIGS. 1 and 2, 1 is a sensor main body, 2 is a case, 3 is a substrate, 4 is a rotation angle detector, 5 is a lever (rotating member), 6 is a movable thread guide, and 7 is a tension spring. (Biasing means), 8 is an eccentric shaft, 9 is an upper stopper, 10 is a fixed entrance side thread guide, and 11 is a fixed exit side thread guide.

The substrate 3 is supported by the horizontal columns 2a, 2b, 2c of the case 2, and the rotation angle detector 4 is fixed to the substrate 3 with a bolt or the like, and the lever 5 is attached to the rotation shaft 4a of the rotation angle detector 4. It is directly inserted. This direct fitting structure simplifies the lever rotation angle detection mechanism. The lever 5 is rotatable about the rotary shaft 4a as a fulcrum A, and has a shape protruding leftward in FIG. 1 so as to rotate counterclockwise by its own weight. Further, a thread guide 6 is attached to the lever 5, and the tension of the thread Y bent by the thread guide 6 gives a force to rotate counterclockwise. In order to oppose the thread guide 6 serving as the force point B, a tension spring 7 that attempts to rotate the lever 5 clockwise is hooked between the pin 5a and the pin 8a of the eccentric shaft 8, and the pin 5a becomes the action point C. ing. As the type of the rotation angle detector 4, a magnetic angle sensor in which a magnet is attached to a rotation shaft and a large number of magnetoresistive elements are arranged to face the magnet, or a rotary circle having a slit between a light emitting element and a light receiving element. There is an optical angle sensor equipped with a plate.

When the yarn Y is not hooked on the yarn guide 6, the rotational force of the lever 5 due to its own weight W and the urging force F of the tension spring balance each other to determine the posture of the lever 5. Then, when the distance ε between the stopper 9 and the lever 5 is set to zero, the lever 5 becomes the reference horizontal posture. Then, when the eccentric shaft 8 is rotated, the lever 5 moves up and down via the tension spring 7, and the gap ε is adjusted to substantially zero such that a gap gauge of 0.5 mm is inserted. The rotation angle of the lever 5 in this state is set in the rotation angle detector 4 as being equivalent to the thread tension of zero. Since the rotational force of the lever 5 due to its own weight W and the rotational force of the urging force F of the tension spring 7 are balanced to maintain the reference horizontal posture, even if the thread tension is small, the lever spring can be adjusted according to the rigidity. Since 5 rotates, measurement from zero thread tension is possible. The upper limit of the thread tension that can be measured is determined by the rigidity of the tension spring 7, and can be measured in a wide range from zero thread tension to a desired thread tension.

As shown in FIG. 2, the entrance side thread guide 10 and the exit side thread guide 11 are projected on the side surface 2 d of the case 2, and the thread guide 6 attached to the lever 5 is a long hole of the case 2. It projects from 2e. Then, the yarn Y is hung on the yarn guide 6 so as to bend between the yarn guides 10 and 11 which are in and out as shown by the one-dot chain line in FIG. 1, and a force corresponding to the tension of the yarn Y acts on the yarn guide 6.

In order for such a sensor body 1 to operate properly, the yarn Y needs to be hooked on the yarn guides 10 and 11 and the yarn guide 6 which are in and out as shown in the figure. For example, if it is hooked on the entry side thread guide 10 and the thread guide 6 and bypasses the exit side thread guide 11, correct measurement cannot be performed. If the mounting position of the sensor body 1 is at a position where it is difficult to operate, such as a high place, the thread Y may be erroneously hooked. Therefore, as shown in FIGS. 2 and 3, the cover 12 is attached to the side surface 2d of the case 2 so as to cover the end faces of the yarn guides 10 and 11 and the yarn guide 6 which are provided in a protruding manner. An inclined surface 12a is provided around the cover 12, and the yarn introduced in the direction of the arrow a in FIG. 3 is prepared by the cover 12, and the yarn guides 10 and 11 that are in and out and the yarn guide 6 must be provided at three points. It is supposed to hang on.

Next, a method of calibrating the sensor body 1 and an apparatus therefor will be described. Specifically, in FIG. 1, the output voltage of the rotation angle detector 4 in a state where the yarn Y is not applied to the yarn guide 6 corresponds to the yarn tension zero, and for example, a yarn in which a reference weight W of 100 grams is tied is used as the yarn guide. The output voltage of the rotation angle detector 4 in the state of being applied to 6 corresponds to a thread tension of 100 grams. Then, it is necessary to calibrate the output voltage of the rotation angle detector 4 to correspond to the unloaded state and the loaded state.

Therefore, two push switches (input means) SW1 and SW2 are attached to the case 2 of FIG. 2, and lamps LED1 and LED2 corresponding to these switches SW1 and SW2 are attached to the substrate 3. As shown in the control block diagram of FIG. 4, many of the sensor bodies 1 are electrically connected to the feedback controller 20 provided separately from the sensor body 1, and the feedback controller 20 is connected via the air controller 21. It is a control circuit for variably adjusting the nip force of many nip twisters (belt type false twisting devices) 55.

The voltages V 0 and V 1 output from the detector 4 when the push switches SW 1 and SW 2 of each sensor body 1 are pressed are temporarily stored in the memory circuits 24 a and 24 b of the feedback controller 20, respectively. Here, the voltage V0 is the voltage value output from the detector 4 when the push switch SW1 is pressed, and the voltage V1 is the voltage value output from the detector 4 when the push switch SW2 is pressed. . The feedback controller 20 further has an arithmetic circuit 25, and determines a yarn tension-output voltage characteristic showing a relation between the yarn tension and the output voltage from the stored two voltages V0 and V1. Then, the output from the detector 4 is calculated as the yarn tension at Vt by a proportional expression of T = (second reference tension-first reference tension) × (Vt-V0) / (V1-V0) + first reference tension To do. The first reference tension and the second reference tension may be set in advance or may be set appropriately. In any case, when the push switches SW1 and SW2 are pressed, it is necessary to set the thread tension to the first reference tension and the second reference tension, respectively. For example, assuming that the first reference tension is 0 grams in the unloaded state and the second reference tension is 100 grams in the loaded state, the above proportional equation is T = 100 × (Vt−V0) / (V1−V0) Become. The arithmetic circuit 25 outputs the obtained yarn tension T to the air controller. Although the feedback controller 20 is actually composed of one microcomputer, it corresponds to the provision of the storage circuits 24a and 24b and the arithmetic circuit 25 corresponding to each sensor main body 1 by the storage address and the sequential calculation.

Next, the procedure of the calibration work will be described. First, the push switch SW1 of the sensor body 1 is pushed in the unloaded state (first reference tension). While the switch SW1 is being pressed, the detection voltage is output from the detector 4 to the memory circuit 24a. The memory circuit 24a reads the output from the detector 4 for several seconds after the switch SW1 is pressed, finds and stores the average value V0 of the output voltage during that time. When the average value V0 is stored, the lamp LED 1 lights up. When the lamp LED1 lights up, the finger is removed from the push switch SW1. Next, when the reference weight W is hung on the tip of the yarn Y as shown in FIG. 1 (second reference tension) and the push switch SW2 is pressed, the same operation as the switch SW1 is performed and the lamp LED2 is turned on. When it lights up, remove your finger from push switch SW2. After that, the arithmetic circuit 25 automatically obtains the relational expression between the yarn tension and the output voltage from the stored voltage values V0 and V1 and the reference tension, and the calibration work is completed.

As described above, by simply pushing the push switches SW1 and SW2 of the sensor body 1, there is no troublesome volume adjustment, the calibration work is simplified, and the work time is shortened. Moreover, since the push switches SW1 and SW2 are provided in each sensor body 1, the calibration of the sensor body 1 of each weight is surely performed. For example, the switches SW1 and SW2 are provided in the feedback controller 20 so that all the weights are common, and the sensor body 1 is designated to sequentially press the switches SW1 and SW2. It may be possible to set up centrally in one place, but mistakes in designation are likely to occur.

Next, the main parts of the draw false twisting machine to which the sensor body 1 described above is applied will be described with reference to FIG. In order to measure the untwisting tension T2 on the downstream side of the belt type false twisting device 55, the sensor main body 1 is arranged at the bent portion of the yarn between the belt type false twisting device 55 and the second feed roller 54. In the belt type false twisting device 55, two endless belts B1 and B2 are respectively wound around two pulleys 55a and 55b, and both belts B1 and B2 are provided so as to intersect each other as shown in the figure. . One of the pulleys 55a and 55b is a drive pulley driven by a tangential belt 55c, and the other pulley 55b is a driven pulley that is driven to rotate via the belts B1 and B2. The yarn Y is nipped at the point N at the intersection of the belts B1 and B2, and the belts B1 and B2 travel in the opposite directions to be fed downward and simultaneously subjected to a twisting action. In order to apply a predetermined nip pressure to the yarn Y, one belt B2 side has its position fixed, and the other belt B1 side can rotate together with the driven pulley 55b around its driving pulley 55a. This is performed by pressing and urging the belt in the direction of the belt B2. Then, in order to fix the nip point N, thread guides 64 and 65 are provided. The yarn guide 64 has a slit guide hole 64a at the tip of the arm, and the guide hole is located in the vicinity of the nip point N. The yarn guide 65 has an hourglass shape so that the reciprocating movement of the yarn by the traverse guide 54c described below does not affect the nip point. The second feed roller 54 is a combination of the roller 54a and the apron belt 54b. A traverse guide 54c that reciprocates in the thickness direction of the paper is attached to the entrance of the second feed roller 54 to extend the life of the roller 54a and the apron belt 54b.

The above-mentioned belt type false twisting device 55 nips the yarn Y between the belts which intersect and run in opposite directions, and twists the yarn Y to obtain a processed yarn of a predetermined quality. The tension T1 and the untwisting tension T2 need to be appropriately maintained. Therefore, the untwisting tension T2 is constantly monitored by the sensor body 1. When the output of the sensor body 1 enters the feedback controller 20 and deviates from the predetermined yarn tension, the nip pressure of the belt type false twisting device 55 is adjusted via the air controller 21 to maintain a predetermined untwisting tension T2. Is done.

Next, the untwisting tension control system for the entire drawing false twisting machine will be described with reference to FIG. The draw false twisting machine 50 has 1-216 spindles (SP) in the illustrated example, forms a span every 12 spindles, and there are 18 spans in total. A feedback controller 20 is provided for each span, and 12 belt type false twisting devices 55 based on 12 sensor main bodies 1 are controlled via an air controller 21. Each feedback controller 20 is connected to a monitor 26. This monitor 26 has a printer 27 and an operating device 28. An appropriate untwisting tension T2 is set through the operating device 28, and a belt type false twisting device 55 is set by the sensor body 1 provided for each weight. Adjust to maintain a predetermined untwisting tension T2. In addition, the actual untwisting tension T2 of each weight is recorded in the printer 27, and the operator regularly checks the data of the printer 27, and from the abnormal value of the untwisting force T2, the failure of the primary heater or the belt type false twisting is detected. The wear of the belt of the device can be known at an early stage. An alarm device may be provided on the monitor 26 together with the printer 27. Further, the false twisting device 55 of the draw false twisting machine is not limited to the belt type and may be a disk type.

[0023]

[Effect of device]

 Since the tension sensor of the present invention balances the self-weight rotational force of the rotating member and the urging force of the urging means, the rotating member rotates even with a slight thread tension, and the thread tension near zero can be accurately measured in a wide range. Can be detected.

[Brief description of drawings]

FIG. 1 is a side view showing an internal structure of a tension sensor of the present invention.

FIG. 2 is a sectional view of the tension sensor.

FIG. 3 is a side view of the tension sensor on the thread guide side.

FIG. 4 is a control block diagram using the tension sensor.

FIG. 5 is a side view of a main part of a draw false twisting machine to which the tension sensor is applied.

FIG. 6 is a system diagram for controlling the untwisting tension of the drawing false twisting machine.

FIG. 7 is a device configuration diagram of a drawing false twisting machine.

[Explanation of symbols]

 1 Sensor body 2 Case 4 Rotation angle detector 5 Lever (rotating member) 6 Thread guide 7 Extension spring (biasing means) A fulcrum B Force point C Action point

Claims (1)

[Scope of utility model registration request] 1. A yarn comprising: a rotary member having a rotatable fulcrum, a force point by a yarn guide, and an action point to which an urging means for counteracting its own rotation is connected; and a rotation angle detecting means for the rotary member. A tension sensor adjusted so that the self-weight rotational force of the rotating member and the urging force of the urging means are balanced with each other in a state where the guide is not threaded.