JP2007024815A - Tension measuring device of conductor for belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the tension of a plurality of conductors to be measured individually with a simple configuration in a transmission belt manufacturing process in which a plurality of tension core wires are arranged in parallel and are buried. <P>SOLUTION: A tension measuring device of a conductor for belts comprises a plurality of measurement pulleys 50, 50, and the like so that each of conductors 3, 3, and the like on the way to a belt forming mold from a delivery roll can be suspended. A plurality of support rods 47, 47, and the like are movably provided so that each of the measurement pulleys 50, 50, and the like can be supported rotatably. The support rods 47 can be energized to one side by a tension spring 51. A displacement gauge 52 for measuring the displacement of the support rods 47 travels so that it can measure the displacement of the plurality of support rods 47 by a drive motor 54, or the like. The displacement of the support rods 47 measured by the displacement gauge 52 is input to a sequencer and is converted to the value of tension in the conductor 3. The position of the displacement gauge 52 is discriminated by a rotary encoder mounted to the drive motor 54. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tension measuring device capable of measuring the tension of each of a plurality of tensile core wires (hereinafter referred to as “core wires”) embedded in a parallel arrangement in the manufacturing process of a transmission belt. Concerning configuration.

Patent Document 1 relates to a yarn winding machine (unlike that used in the manufacture of a transmission belt as in the present invention), but facilitates tension during yarn winding operation and yarn switching operation. For the purpose of enabling accurate detection, the tension of the running yarn is measured by a non-contact type tension detector, and the tension at the time of switching the yarn from the yarn winding package to the empty bobbin is contacted. A configuration in which measurement is performed by a mold tension detector is disclosed.
Japanese Patent No. 36552901 (Claim 1 etc.)

  By the way, when manufacturing, for example, a free span belt having a configuration in which a plurality of core wires are embedded and hardened in a resin, if the tension of the core wires in the resin varies, the belt may be twisted. There is a need to measure and monitor tension and reduce tension variation. In this regard, the method of measuring tension by applying a number of core wires to one roll cannot meet the above-mentioned needs because the tension of individual core wires cannot be measured.

  Further, the non-contact type tension detector of Patent Document 1 is configured to measure and grasp the absolute value of the tension of the traveling yarn by the transmission speed of the transverse wave generated by the traverse mechanism of the yarn winding device, It cannot be applied to the technical field of manufacturing a transmission belt that does not traverse the core.

  Patent Document 1 also discloses a contact-type tension detector, which has a configuration using a strain gauge or a displacement gauge. Here, in the manufacture of the above-mentioned free span belt, a large number of core wires (for example, 100 or more) may be embedded side by side, and the contact type tension detector disclosed in Patent Document 1 is provided for each one. Would cause a significant increase in equipment costs. In addition, it is conceivable to provide a tension detector using a load cell and a load cell amplifier for each core wire. However, in this case as well, it causes a significant increase in equipment cost.

  Although it is conceivable to measure the tension of the core wire with a handy type measuring device, this method takes time and labor to measure, so the tension of many core wires is individually measured and continuously monitored. It is virtually impossible.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a simple configuration capable of easily measuring the tensions of a plurality of core wires individually.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, there is provided the following configuration of a tension measuring device that measures the tension of each of a plurality of tensile cords that are embedded in a belt while being arranged in parallel. A plurality of pulleys provided to hang each of the core wires on the way from the feeding roll to the belt molding die, and a plurality of movable units provided to rotatably support each of the pulleys A support, an urging spring for urging each of the supports to one side, a displacement meter for measuring the displacement of the support, and a conversion for converting a signal obtained from the displacement meter into a tension of a core wire Means, moving means for moving the displacement meter so that the displacement of the plurality of supports can be measured, and position determining means for determining the position of the displacement meter.

  As a result, the displacement of multiple supports can be read and converted into the tension of the core wire by moving the displacement meter, so that the tension of a large number of core wires can be measured individually with a small number of displacement meters. Can be greatly simplified. Further, since the position of the displacement meter can be determined by the position determining means, the obtained tension value can be acquired in association with the position of each core wire. Therefore, it is extremely suitable for an application in which the tension is monitored by measuring the tension of a large number of core wires.

  The above tension measuring device for the core wire for the belt is preferably configured as follows. A plurality of the pulleys are provided side by side, and the direction in which the pulleys are arranged is a direction perpendicular to the traveling direction of the core wire. The direction in which the moving means moves the displacement meter is a direction along the direction in which the pulleys are arranged.

  This realizes a configuration for scanning the displacement meter along the direction in which the pulleys are arranged, so that the mechanism for moving the displacement meter to obtain the tension value data of the plurality of core wires can be configured simply, The control can also be simplified. Further, since the direction in which the pulleys are arranged is perpendicular to the running direction of the core wire, a plurality of pulleys can be arranged in a compact space, and the scanning stroke of the displacement meter can be shortened.

  The above tension measuring device for the core wire for the belt is preferably configured as follows. The moving means includes a ball screw mechanism and a drive motor that rotationally drives a screw shaft of the ball screw mechanism. The position determination means includes a rotary encoder that detects a rotational position of the screw shaft.

  Thereby, while the structure for the movement of a displacement meter can be simplified, it can be discriminate | determined with a simple structure which tension of the core wire the displacement meter is measuring now.

  The above tension measuring device for the core wire for the belt is preferably configured as follows. The rotary encoder is configured to output a number of pulses corresponding to the position of the displacement meter. The position determining means further includes a counter means, and the core wire corresponding to the support body measured by the displacement meter is identified by counting the pulses output from the rotary encoder by the counter means.

  As a result, it is possible to accurately determine on the control side which tension of the core wire the displacement meter is currently measuring, so that a highly reliable measurement result can be obtained.

  Next, embodiments of the invention will be described. FIG. 1 is a schematic diagram of a transmission belt manufacturing apparatus to which a tension measuring device for a belt core wire according to an embodiment of the present invention is applied. FIG. 2 is a perspective view of a main part showing a detailed configuration of the tension measuring device, and FIG. 3 is a block diagram showing a configuration for controlling the tension measuring device.

  A polyurethane toothed belt manufacturing apparatus 20 shown in FIG. 1 is configured as a so-called free span belt manufacturing apparatus, and includes a molding unit 21, a core wire supply unit 23, and a winding unit 25. As prepared. The molding part 21 is provided with a molding die roll (belt molding die) 26, and the polyurethane toothed belt (belt) 1 is rotated by rotating the molding die roll 26 while flowing polyurethane resin. It is configured to be molded.

  In addition to the molding die roll 26, the molding unit 21 has three rolls 27 to 29 and an endless steel band 31. On the outer periphery of the molding die roll 26, tooth molds are formed at a predetermined pitch. The three rolls 27 to 29 are disposed in the vicinity of the molding die roll 26, and the steel band 31 is wound around the rolls 27 to 29 and the molding die roll 26.

  An extrusion nozzle 43 is disposed in the vicinity of the outer periphery of the molding die roll 26, and the heated and fluidized polyurethane resin is extruded from the extrusion nozzle 43. Thereby, the molding unit 21 rotates the plurality of core wires 3... Along the resin by the pressure of the molding die roll 26 and the steel band 31 to mold the toothed belt 1. It is configured as follows.

  Although a detailed configuration of the winding unit 25 is not illustrated, a winding roll (not shown) driven by a motor is provided, and the toothed belt 1 molded by the molding unit 21 can be wound around the winding roll. It is configured. The toothed belt 1 taken up by the take-up unit 25 is cut to a desired length, and then joined to both ends to form an endless shape, and is shipped after inspection.

  The core wire supply unit 23 includes a creel stand 36 that supports a number of feed rolls 41 each wound with one core wire 3, and a plurality of core wires 3 fed from these feed rolls 41, 41,. A degreasing tank 37 for immersing 3 ... in the degreasing liquid, an adhesive treatment tank 38 for immersing the degreased core wire 3 in the adhesive liquid, and an oven device 39 for heating and drying the treated core wire 3; A tension applying device 40 that applies a predetermined tension to the core wire 3, and a tension measuring device 45 that individually measures the tension of the plurality of core wires 3, 3,.

  The core wire 3 may be made of, for example, polyester, aliphatic polyamide, aromatic polyamide, or a low-stretch high-strength rope made of glass fiber, carbon fiber, aramid fiber, metal fiber, or the like. These core wires 3 are embedded while being arranged at equal intervals in the belt width direction so that a plurality of the core wires 3 are parallel to each other, and are configured to form a tensile body layer in the toothed belt 1. Yes. In the creel stand 36, the feeding rolls 41 are provided by the number of the cores 3, 3... Embedded in the toothed belt 1 (FIG. 1 shows the case of 10).

  In this embodiment, the tension measuring device 45 for measuring and monitoring the tension of the core wire 3 is provided at a position between the tension applying device 40 and the molding die roll 26.

  As shown in FIGS. 1 to 3, the tension measuring device 45 includes a flat support frame 46, and a plurality of elongated support rods (supports) 47, 47. Is supported. Each of the support rods 47, 47,... Is supported with respect to the support frame 46 with its longitudinal direction directed in the vertical direction, and is slidable in the longitudinal direction (vertical direction). As shown in FIGS. 2 and 3, a plurality of the support rods 47, 47,... Are provided so as to correspond to the plurality of core wires 3, 3,.

  A reflection surface 48 for reflecting a laser emitted from a laser displacement meter 52 described later is formed on one end surface of the support rod 47 in the longitudinal direction (an upper end surface protruding upward from the support frame 46). On the other hand, an arm 49 is formed at the other end of the support rod 47 (the lower end protruding downward from the support frame 46), and a measurement pulley (pulley, rotating body) 50 is freely rotatable at this arm 49 portion. It is supported by.

  As shown in FIGS. 2 and 3, the measuring pulley 50 has the cores 3, 3... So that each of the cores 3, 3. The same number as the number is provided side by side. Further, as shown in FIG. 2, the direction in which the measurement pulleys 50 are arranged is a direction substantially perpendicular to the running direction of the core wires 3... (Direction corresponding to the width direction of the toothed belt 1). It is said that.

  A tension spring 51 as an urging spring is attached to the support rod 47. The tension spring 51 has a coil spring shape, and one end (lower end) of the tension spring 51 is engaged with the support rod 47 and the other end (upper end) thereof is engaged with the support frame 46, thereby supporting the measurement pulley 50. A biasing force that pulls toward one side (upper side) in the axial direction via the rod 47 is always applied.

  In this configuration, a relationship is established that the tension of the tension spring 51 increases as the tension of the core wire 3 hung on the measurement pulley 50 increases, and the amount of downward displacement of the support rod 47 increases (the hooks). law). Therefore, the displacement of the support rod 47 is read (by a laser displacement meter 52 described later), and the read displacement is substituted into an appropriate conversion formula (formula using the above-mentioned Hooke's law) for conversion. The tension of the core wire 3 applied to the measurement pulley 50 attached to the rod 47 can be acquired.

  A laser displacement meter (displacement meter) 52 is disposed above the support frame 46. The laser displacement meter 52 includes a light projecting unit, a light receiving unit, an amplifier, and the like. The laser beam is emitted from the light projecting unit, and the reflected light reflected by the reflecting surface 48 included in the support rod 47 is received by the light receiving unit. Thus, it is configured as a non-contact displacement meter capable of measuring the vertical position (displacement amount) of the support rod 47. As shown in FIG. 3, the laser displacement meter 52 is connected to a sequencer (control device, conversion means) 60 as a controller, and the displacement amount of the support rod 47 measured by the laser displacement meter 52 is a voltage signal. And is converted into tension data of the core wire 3 by the operation of the sequencer 60.

  The tension measuring device 45 includes a ball screw mechanism 53 and a drive motor 54, and the laser displacement meter 52 is fixed to a nut portion 56 that can move on the screw shaft 55 of the ball screw mechanism 53. The screw shaft 55 is connected to the output shaft of the drive motor 54 so that the laser displacement meter 52 can be moved in a linear direction together with the nut portion 56 by driving the drive motor 54 forward / reversely. It is configured. In the present embodiment, the ball screw mechanism 53 and the drive motor 54 serve as moving means for moving the laser displacement meter 52.

  As shown in FIG. 3, the drive motor 54 is electrically connected to the sequencer 60 via an inverter 61, and forward / reverse / stop is controlled via the inverter 61 by a drive signal from the sequencer 60. It has become so.

  Note that the screw shaft 55 of the ball screw mechanism 53 is rotatably supported in a state where its axis is oriented in a direction parallel to the direction in which the measurement pulleys 50 are arranged. Accordingly, the laser displacement meter 52 moves in a direction along the direction in which the measurement pulleys 50 are arranged, as indicated by a thick arrow in FIG.

  As shown in FIG. 3, the drive motor 54 is provided with a rotary encoder 57 that detects the rotational position of the output shaft. The rotary encoder 57 is electrically connected to the sequencer 60. The rotary encoder 57 outputs a number of pulses corresponding to the position of the laser displacement meter 52, and this pulse signal is input to the sequencer 60.

  As shown in the block diagram of FIG. 3, the sequencer 60 includes a high-speed counter unit 62 that counts pulse signals from the rotary encoder 57, and an A / A for digitally converting the voltage signal input from the laser displacement meter 52. A D conversion unit 63 and an input / output unit 64 for sending a control signal to the inverter 61 are provided.

  In the present embodiment, the rotary encoder 57 and the sequencer 60 (including the high-speed counter unit 62) serve as position determination means for recognizing and determining the position of the laser displacement meter 52.

  The sequencer 60 includes a CPU (not shown) as arithmetic means, and hardware such as ROM and RAM as storage means. The ROM stores programs (software) for controlling various devices such as the laser displacement meter 52 and the drive motor 54.

  The sequencer 60 controls the drive motor 54 via the inverter 61 so as to move the laser displacement meter 52 from one end side to the other end side of the screw shaft 55. Therefore, the light projecting unit and the light receiving unit of the laser displacement meter 52 pass (scan) one after another through the respective reflecting surfaces 48 of the support rods 47, 47,. The displacements of the reflecting surfaces 48 of the plurality of support rods 47, 47,... Thus measured are input to the A / D conversion unit 63 as voltage signals.

  At the same time, the current rotational position of the screw shaft 55 (and hence the position of the laser displacement meter 52) is detected by the rotary encoder 57, and a pulse signal as a result of the detection is input to the high-speed counter unit 62. The high-speed counter unit 62 counts this pulse signal to determine which position the laser displacement meter 52 is currently in (that is, which displacement displacement of the reflecting surface 48 of the support rod 47 is read by the laser displacement meter 52). can do.

  As described above, the sequencer 60 as the controller of the tension measuring device 45 moves the laser displacement meter 52 from one end side in the belt width direction to the other end side, and measures the number 3 of the core wire 3 from one end side in the belt width direction. The displacement of the reflecting surface 48 is read by the laser displacement meter 52 while being recognized by the signal from the rotary encoder 57, and this is calculated by the internal CPU using the above hook law formula, It converts into the tension value of the core wire 3. By doing so, it is possible to individually measure the tensions of the plurality of core wires 3, 3... With a simple configuration.

  After the scanning of the laser displacement meter 52 is completed and the displacement of all the support rods 47, 47... (The tension of the core wires 3, 3...) Is measured, the next scanning of the laser displacement meter 52 and Measurement is performed. As described above, while the laser displacement meter 52 is reciprocatingly moved, the tension of the plurality of core wires 3, 3... Is continuously measured, and the obtained tension data is appropriately stored in the RAM or the like in the sequencer 60. The data is stored and accumulated, and is output as necessary to an output device such as a display or a printer (not shown).

  As described above, the tension measuring device 45 of the present embodiment is provided with a plurality of the core wires 3, 3... On the way from the feeding roll 41 to the molding die roll 26. .., And a plurality of movable support rods 47, 47... Provided to rotatably support each of the measurement pulleys 50, and each of the support rods 47. A tension spring 51 biased to the side, a laser displacement meter 52 for measuring the displacement of the support rod 47, a sequencer 60 for converting a signal obtained from the laser displacement meter 52 into the tension of the core wire 3, and a plurality of A ball screw mechanism 53 and a drive motor 54 for moving the displacement meter so that the displacement of the support can be measured, a rotary encoder 57 and a sequencer for determining the position of the laser displacement meter 52 Including 0 and, the.

  By moving the laser displacement meter 52, the displacement of the plurality of support rods 47, 47... Can be read and converted into the tension of the core wire 3 by the sequencer 60, so that the tension data can be acquired. The tension of a large number of core wires 3, 3... Can be measured with the total number of 52 (one in this embodiment), and the configuration can be greatly simplified. According to the calculation of the inventor of the present application, in the case of the manufacturing apparatus 20 that embeds 120 cores 3..., The configuration of the present invention is one of the cores 3, 3. On the other hand, a trial calculation result indicating that the equipment cost can be reduced to 1/8 as compared with a configuration in which a load cell and a load cell amplifier are provided and tension is measured.

  Further, since the position of the laser displacement meter 52 can be discriminated by the rotary encoder 57 or the like, the tension value can be obtained in association with the position of the individual cores 3. It is extremely suitable for applications that measure and monitor variations in tension.

  Further, in the tension measuring device 45 of this embodiment, a plurality of the measurement pulleys 50 are provided side by side, and the direction in which the measurement pulleys 50 are arranged is a direction perpendicular to the traveling direction of the core wire 3. The direction in which the ball screw mechanism 53 and the drive motor 54 move the laser displacement meter 52 is a direction along the direction in which the measurement pulleys 50 are arranged.

  This realizes a configuration in which the laser displacement meter 52 is scanned along the direction in which the measurement pulleys 50, 50... Are arranged, so that the mechanism for moving the laser displacement meter 52 is simplified and the sequencer 60 side The control at can also be simplified. Further, since the direction in which the measurement pulleys 50, 50,... Are arranged is perpendicular to the traveling direction of the core wires 3, 3,..., A plurality of measurement pulleys 50, 50,. , And the moving stroke for scanning the laser displacement meter 52 can be shortened, so that the measurement time can be shortened.

  In this embodiment, the laser displacement meter 52 is moved by a ball screw mechanism 53 and a drive motor 54 that rotationally drives the screw shaft 55 of the ball screw mechanism 53. The rotary position of the screw shaft 55 is detected by the rotary encoder 57, and the position of the laser displacement meter 52 is determined based on the detected position.

  Therefore, the configuration for moving the laser displacement meter 52 can be simplified, and it can be determined with a simple configuration which tension of the core wire 3 the laser displacement meter 52 is currently measuring.

  The rotary encoder 57 is configured to output a number of pulses corresponding to the position of the laser displacement meter 52, and the sequencer 60 further includes a high-speed counter unit 62, which is output by the rotary encoder 57. By counting the pulses, the core line corresponding to the support rod 47 being measured by the laser displacement meter 52 is identified.

  As a result, the sequencer 60 can accurately determine which core wire 3 is currently measuring the tension of the laser displacement meter 52, so that a highly reliable measurement result can be obtained.

  Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

  In the above-described embodiment, as shown in FIG. 2, the tension spring 51 is configured to be installed in a recess provided in the support rod 47. However, the tension spring 51 is provided outside the support rod 47 and connected. Can be changed to configuration. Moreover, it can change into the structure which uses a compression spring and a leaf | plate spring instead of the tension spring 51, for example.

  It is possible to change to a configuration in which two or more laser displacement meters 53 are provided and the displacements of the plurality of support rods 47, 47,. In this case, the time required for scanning all the support rods 47 can be shortened.

  In the above-described embodiment, the support rod 47 is configured to slide in the axial direction, but instead, on the distal end side of a rotating arm (support body) in which the base end side is pivotally supported by the support frame 46. It can change to the structure which supports the measurement pulley 50 rotatably.

  In the above-described embodiment, the laser displacement meter 52 is used. However, instead of this, a configuration using another type of non-contact type or contact type displacement meter can be used.

  The rotary encoder 57 can be changed to a configuration attached to the screw shaft 55 instead of the configuration attached to the drive motor 54.

  The position where the tension measuring device 45 is installed can be changed from the position between the tension applying device 40 and the molding die roll 26 (see FIG. 1) to any other position. That is, the tension measuring device 45 can be installed at an arbitrary position in the middle of the path of the core wire 3 from the feeding roll 41 to the molding die roll 26.

The schematic diagram of the power transmission belt manufacturing apparatus provided with the tension measuring device which concerns on one Embodiment of this invention. The principal part perspective view which shows the detailed structure of a tension | tensile_strength measuring apparatus. The block diagram which shows the structure for control of a tension | tensile_strength measuring apparatus.

Explanation of symbols

1 Polyurethane toothed belt (power transmission belt, belt)
3.3. Core wire 20 Manufacturing device 26 Molding die roll 41. 41 ... Feeding roll 45 Tension measuring device 47. 47 ... Support rod (support)
50 ・ 50 ・ ・ ・ Measurement pulley (pulley)
51.51 ... Tension spring (biasing spring)
52 Laser displacement meter (displacement meter)
53 Ball screw mechanism (part of moving means)
54 Drive motor (part of moving means)
57 Rotary encoder (part of position discriminating means)
60 Sequencer (conversion means)
62 High-speed counter unit (counting means, part of position discrimination means)

Claims (4)

A tension measuring device that measures the tension of each of a plurality of tensile cords embedded in a belt while being arranged in parallel,
A plurality of pulleys provided to hang each of the core wires on the way from the feed roll to the belt molding die;
A plurality of movable supports provided to rotatably support each of the pulleys;
A biasing spring that biases each of the supports to one side;
A displacement meter for measuring the displacement of the support;
Conversion means for converting the signal obtained from the displacement meter into the tension of the core wire,
Moving means for moving the displacement meter so that the displacement of the plurality of supports can be measured;
Position determining means for determining the position of the displacement meter;
A tension measuring device for a core wire for a belt, comprising: It is the tension measuring device of the core wire for belts according to claim 1,
A plurality of the pulleys are provided side by side, and the direction in which the pulleys are arranged is a direction perpendicular to the traveling direction of the core wire,
The tension measuring device for a belt cord is characterized in that the moving means moves the displacement meter along a direction in which the pulleys are arranged. It is the tension measuring device of the core wire for belts according to claim 2,
The moving means includes a ball screw mechanism and a drive motor that rotationally drives a screw shaft of the ball screw mechanism,
The belt core wire tension measuring device according to claim 1, wherein the position determining means includes a rotary encoder for detecting a rotational position of the screw shaft. It is the tension measuring device of the core wire for belts according to claim 3,
The rotary encoder is configured to output a number of pulses corresponding to the position of the displacement meter;
The position discriminating means further comprises a counter means, and the core wire corresponding to the support body measured by the displacement meter is identified by counting the pulses output from the rotary encoder by the counter means. A tension measuring device for the belt core wire.

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