JPH04133651U - tension control device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to obtain a tension control device that can provide performance with desired accuracy at a low cost. [Configuration] A motor 3 that rotationally drives the winding core tube 9, an eddy current clutch 4 that transmits the rotational force of this motor 3 to the winding core tube 9, and a diameter of the roll wound around the winding core tube 9 is measured. The present invention is characterized in that it is constituted by means for performing calculations, a control condition storage device, and a control device 2 that performs arithmetic processing using these information. The unwinding control device for the roll wound around the unwinding core tube also had a similar configuration.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea can be used in the processing or treatment process of various films or thin wires. Unwinding the unwinding material such as the above-mentioned film wound on the core tube, or For the tension control device used in the work of winding the above film etc. onto the core tube. In particular, tension control systems that can provide performance with the desired accuracy at low cost. Regarding the location.

0002

[Conventional technology]

The process of unwinding various film products from rolls wound around the heart tube or winding them around the heart tube. In the industry, or in the work of unwinding or winding fine wire, these products are Always keep the tension constant to prevent unwinding or excessive tension. Tension control is performed for winding. There are manual, semi-automatic, and automatic tension controls for these tension controls. There are three types: dancer roll type, dancer roll type, and minute displacement type. These tension control methods described above involve the fixed part and the unwinding part in unwinding control. A controllable brake such as a hysteresis brake or powder brake is installed between the heart tube and the heart canal. A pinch roller, etc., which pinches the unrolled material unwound from the roller, is equipped with a The braking force of the above brake is controlled based on the detected value of the tension sensor. There is something I am doing. In addition, the winding control system corresponding to the above method includes a winding motor and a winding core tube. A clutch that can control the transmission torque, such as a hysteresis clutch or a powder clutch, A latch is attached to the pinch roller, etc. that pinches the material being wound around the heart tube. The transmission torque of the above clutch is controlled based on the detected value of the tension sensor. are doing. In addition, some winding control methods use a servo motor as the winding motor. The output shaft of this motor can be directly or geared for deceleration without using a controllable clutch. It is connected to the winding core tube through a transmission mechanism such as a roller, and the winding material to be wound on the core tube is connected to the core tube through a transmission mechanism such as a roller. The above servo motor is activated based on the detected value of the tension sensor installed on the pinch roller etc. Some are designed to control data.

0003 Next, Figure 9 shows a conventional example of using a hysteresis clutch for tension control during winding. I will explain. In FIG. 9, 10 is a film that is wound up on a winding tube 9, and 11 and 12 are shown here. A pinch roller 35 winds up the film and applies tension in front of the core tube 9. This is a tension sensor attached to the roller 12. Measured value of this tension sensor 35 is input to the control device 32 via a measurement signal line 36. In the control device 32, the obtained information is processed according to preset control conditions. The control output supplies current to the coil of the hysteresis clutch 34 via the control signal line 38. It's flowing. The input shaft of the hysteresis clutch 34 is driven by the motor 33, and the output shaft is It is connected to the winding core tube 9 and applies rotational force. In the above configuration, the relationship between the output torque of the hysteresis clutch and the required tension is The relationship is the characteristic shown in the following equation. That is, the output torque is T, the tension is F, and the directivity of the winding roll wound around the winding core tube 9 is If the diameter is D and efficiency is ignored, it is generally expressed as T=F×D/2. In addition, the hysteresis clutch operates within the range of 20 to 100% of the excitation current to the coil. In this case, the transmitted torque is approximately proportional to the excitation current. Therefore, in accordance with the control conditions of this control device 32, this winding When you set and input the predetermined conditions necessary for controlling an object and start controlling it, the tension sensor The control device 32 that has input the measurement value of the sensor 35 winds up the winding roll according to the diameter of the winding roll. The output of the hysteresis clutch 34 is set to an appropriate torque so that the object has a predetermined tension. Calculate the torque value so that the hysteresis scratch 34 The current value required to transmit the torque is calculated and output to this hysteresis clutch 34. do. The tension that fluctuates as a result of this output fluctuates the measured value of the tension sensor 35, The control device 32 changes the above-mentioned current value, so that the above-described operation of the control device 32 continues. be done. In tension control of the unwinding core tube, in contrast to the control of the winding core tube shown in Fig. 9, The rotor side of the hysteresis brake connected to the unwinding core tube is fixed, and the winding core tube is The required braking force for the hysteresis brake is exerted by means similar to control. Current is made to flow through this hysteresis brake. Conventional tension control involves directly measuring and controlling tension as described above. In addition, the diameter of the take-up roll or unwind roll, that is, the above-mentioned D, can be determined directly or indirectly. Measures are also being taken to calculate the tension or braking force.

0004

[Problem that the idea aims to solve]

For example, in the conventional tension control method in the winding core tube described above, the tension F Both in the means of directly measuring and controlling the diameter D, and in the means of controlling it in accordance with the diameter D. , in a method using a hysteresis clutch, the flow to the hysteresis clutch is Current control is required, and controlling the current value required for clutch control is expensive. However, it is difficult to improve control accuracy considering the price. Also, the fact that the tension is constant with respect to the control current means that the rotational speed of the winding core tube is There is a problem in that the tension cannot be changed as the temperature changes. Also, if a powder clutch is used instead of a hysteresis clutch, powder Since the da clutch is a contact type using magnetic powder, continuous sliding such as tension control is possible. Tension control using a pulley is a harsh method and reduces control accuracy. Also, when using a servo motor, it is difficult to control tension and rotation speed at the same time. However, there was a problem in that the cost of the control device was also high. A similar problem existed in controlling the unwinding heart tube. The present invention solves the above problems and provides performance with the desired accuracy at a low cost. The purpose of this invention is to provide a tension control device that can

[0005]

[Means to solve the problem]

In order to solve the above problems, the tension control device of the present invention has an unwinding center. A wound material such as a film that is wound around a tube or wound around a winding core tube is held under a specified tension. In a tension control device that unwinds at a predetermined tension or winds up at a predetermined tension, In controlling the winding core tube, there is a motor that rotates the winding core tube, and a motor that rotates the motor. An eddy current clutch transmits force to the winding core tube, and the winding core tube rotates at a predetermined angle. a first rotation detector that outputs a signal to the a second rotation detector that outputs a signal every time the pinch roller rotates by a predetermined angle; A working condition setting function that sets and stores the working conditions of the tension control device and the tension control A control condition setting function that sets and stores the control conditions of the device, an arithmetic processing unit, and the arithmetic processing unit. and a motor driver that amplifies the output signal of the control device to drive the motor. According to the control conditions set in the control condition setting function, the control conditions are stored in the work condition setting function. The command rotation of the above-mentioned motor is performed using the data and the output signals of the first and second rotation detectors. The rotation speed is calculated by the arithmetic processing device, and the above instruction is sent via the motor driver. The above motor is driven at a rotational speed of 1. The control conditions set in the control condition setting function are obtained from the first rotation detector. The rotation angle signal that is output every time the winding core is rotated by a predetermined angle, and the From the signal obtained from the second rotation detector at each predetermined rotation angle, the instant Calculate the diameter of the winding roll wound on the winding core tube in the work condition setting machine. The above working conditions are determined based on the winding tension corresponding to the material of the material to be wound, which is stored in memory. Calculate the torque to the winding tube at the roll diameter stored in the setting function and The motor is adjusted according to the characteristics of the eddy current clutch set and stored in the control condition setting function. It is effective to control the rotation speed. Furthermore, the motor driver receives the rotational speed command value of the motor and the rotational speed command value of the motor. It has a servo function that compares and amplifies the signal from the installed rotational speed sensor. desirable.

[0006] In addition, the unwinding material such as a film wound on the unwinding core tube is unwound with a predetermined braking force. In such a tension control device, an unwinding motor that rotationally drives the unwinding core tube and an eddy current brake that transmits the rotational force of the unwinding motor to the unwinding core tube. a first rotation detector that outputs a signal every time the unwinding core tube rotates by a predetermined angle; A pinch roller assists in unwinding the roll, and the pinch roller rotates at a predetermined angle. Setting and memorizing the working conditions of the second rotation detector that generates the signal and the tension control device Condition setting function and control condition setting function that sets and stores the control conditions of the tension control device. and an arithmetic processing device, which amplifies the output signal of the arithmetic processing device to drive the unwinding motor. It is equipped with a motor driver to drive the motor, and it is equipped with a Therefore, the data stored in the working condition setting function and the outputs of the first and second rotation detectors Using the signal, the command rotation speed of the unwinding motor is calculated by the processing unit. Then, the unwinding motor is driven at the command rotation speed through the motor driver. It was to so. The control conditions set in the control condition setting function are obtained from the first rotation detector. The rotation angle signal that is output every time the unwinding core tube rotates by a predetermined angle, and the From the signal obtained from the second rotation detector at each predetermined rotation angle, the instant Calculate the unwinding roll diameter at and store the unwinding roll diameter in the work condition setting function. Based on the unwinding tension corresponding to the material of the object, the work condition setting function The control condition setting machine calculates the brake torque for the unwinding core tube at the diameter of the roll. The rotational speed of the unwinding motor is adjusted according to the characteristics of the eddy current brake that have been set and memorized. It is effective to control the Furthermore, the motor driver receives the rotational speed command value of the unwinding motor and the unwinding motor. A servo function that compares and amplifies the signal from the rotation speed sensor attached to the output motor. It is desirable to have one.

[0007]

[Effect]

As mentioned above, the tension control device based on this invention is wound around the unwinding core tube. Alternatively, unwind the film or other material to be wound onto the winding tube with a predetermined tension. is used to control the winding tube in a tension control device that winds at a predetermined tension. In this case, a motor is used to rotate the winding core tube, and the rotational force of the motor is applied to the winding tube. The eddy current clutch transmits to the core tube and the winding core tube outputs a signal every time the core tube rotates by a predetermined angle. a first rotation detector, a pinch roller that assists in winding up the material to be wound, and a first rotation detector that assists in winding the material; a second rotation detector that outputs a signal every time the tension roller rotates by a predetermined angle, and the tension control device. A working condition setting function that sets and stores the working conditions of the machine and the control conditions of the tension control device. a control condition setting function that stores settings, an arithmetic processing unit, and output signals of the arithmetic processing unit; and a motor driver that amplifies the signal to drive the motor, and sets the control conditions as described above. According to the control conditions set for the function, the data stored in the above working condition setting function and The command rotation speed of the motor is calculated using the first and second rotation detector output signals. The rotation speed is calculated by the control device, and the motor is driven at the command rotation speed through the motor driver. The following motor is driven. Also, it is possible to unwind the film, etc. wound on the unwinding tube. In a tension control device that unwinds objects with a predetermined braking force, the unwinding center An unwinding motor rotates the tube, and the rotational force of the unwinding motor is applied to the unwinding core tube. an eddy current brake that transmits to the 1 rotation detector, a pinch roller that assists in unwinding the film, and the pin A second rotation detector that outputs a signal every time the chiller rotates by a predetermined angle, and the tension control device. A working condition setting function that sets and stores the working conditions of the tension control device and the control conditions of the tension control device. A control condition setting function that stores settings, an arithmetic processing unit, and an output signal of the arithmetic processing unit. and a motor driver that amplifies and drives the unwinding motor, and the control condition described above is According to the control conditions set in the setting function, the data stored in the work condition setting function and The command rotation speed of the unwinding motor is determined using the first and second rotation detector output signals. The arithmetic processing unit calculates the above command rotation speed via the motor driver. The above unwinding motor is driven by the same amount of time, allowing accurate tension control at low cost. It can be done.

[0008] In addition, in controlling the winding tube, the control conditions set in the control condition setting function described above are used. The condition is outputted every time the winding core tube rotates by a predetermined angle obtained from the first rotation detector. and a rotation angle signal from the second rotation detector during the angle rotation. From the signals obtained at each angle, the winding rod wound on the winding core at that moment can be determined. The diameter of the roll is calculated, and the diameter is determined to correspond to the material of the roll that is stored in the work condition setting function. Winding at the roll diameter stored in the working condition setting function based on the winding tension Calculate the torque for the center tube and apply the eddy current torque set and stored in the control condition setting function. The rotational speed of the motor is controlled in accordance with the characteristics of the latch, and the unwinding tube is In this control, the control conditions set in the control condition setting function are the same as those set in the first control. The rotation angle signal outputted every time the unwinding core tube rotates by a predetermined angle obtained from the rotation detector. , a signal obtained from the second rotation detector for each predetermined rotation angle during the angular rotation. Calculate the diameter of the unwinding roll at that moment and record it in the work condition setting function. The working condition setting machine Calculate the brake torque for the unwinding core tube at the roll diameter stored in memory beforehand. The unwinding is performed in accordance with the characteristics of the eddy current brake set and stored in the control condition setting function. The above measurement and control can be made easier by controlling the rotational speed of the motor. It can be carried out easily and reliably.

[0009] Furthermore, in controlling the winding tube, the motor driver is used to rotate the motor. Compare and amplify the rotation speed command value and the signal from the rotation speed sensor attached to the motor. The motor driver is also equipped with a servo function to control the unwinding tube. The driver uses the rotational speed command value of the unwinding motor and the rotation installed on the unwinding motor. By having a servo function that compares and amplifies the signal from the rotation speed sensor, The control performance can be further improved.

0010

【Example】

Next, we applied the tension control device based on this idea to the roll winding on the winding core tube. The embodiment will be described in detail with reference to FIGS. 1 to 8. In FIG. 1, 1 is a take-up roll section, and 2 is a control device. The winding roll unit 1 is a winding core tube 9 and a motor that rotationally drives the winding core tube 9. DC motor 3 (hereinafter referred to as motor) outputs rotation of this motor to a predetermined torque. An eddy current clutch 4 that converts the eddy current and transmits it to the winding core tube, the motor 3 and this eddy current clutch The input shaft 7 of the eddy current clutch connects the latch 4, the eddy current clutch 4 and the winding center The output shaft 8 of the eddy current clutch connects the pipe 9, and the output shaft 8 and the winding core tube 9. It is constituted by a first rotation detector 5 coupled to a connecting portion with. A film 10 (hereinafter referred to as film), which is a material to be wound, is wound on the winding core tube 9. It has been taken. This film 10 is passed through pinch rollers 11 and 12 before being wound up. It is held that One of the two pinch rollers, 12, has a 2 rotation detectors 13 are connected to each other, and the rotation angle of the pinch roller 12 corresponds to the rotation angle of the pinch roller 12. A pulse train is outputted and inputted to the control device 2 through the first signal line 14. The first rotation detector 5 outputs a pulse at each predetermined rotation angle of the winding core tube 9, It is transmitted to the control device 2 via the second signal line 15. This control device 2 uses preset control conditions, details of which will be described later, and the first rotation. It is calculated based on the input signals from the detector 5 and the second rotation detector 13, and Therefore, the command signal to rotate the above motor at the rotation speed obtained is sent to the motor driver. output to bar 6. The motor driver 6 has a function as a servo amplifier, The command signal sent from the control device and the tachometer 18 attached to the motor 3 Compare the rotational speed signal of this motor 3 sent via the third signal line 17 from , the drive current of the motor 3 corresponding to the deviation signal obtained from the comparison result is transmitted via the output line 19. Then, it is sent to the motor 3 and driven.

[0011] FIG. 2 is a block diagram explaining the operation of the tension control device 2 in the above configuration. be. In FIG. 2, signals from the second rotation detector 13 and the first rotation detector 5 are shown. are input to the control device 2 via the first signal line 14 and the second signal line 15, respectively. I'm working hard. The control device 2 has an input that receives the above-mentioned input signal and converts it into a signal suitable for internal processing. The power interface 20 applies the results of the calculation processing by this control device 2 to the external target circuit. Output interface 21 that converts and outputs the signal Condition data and various control condition setting signals such as the calculation program that executes this control. , setting functions and predetermined settings that are entered manually or with a reading device from an external storage device, etc. The operation panel 22 is equipped with a display function for displaying the signals input from the operation panel. a first storage device that stores data indicating predetermined working conditions and/or calculation conditions; 23. Storing the basic arithmetic processing program and numerical values indicating the control conditions of this control device 2. a second storage device 24 for storing calculation process data, a third storage device 25 for storing calculation process data, and , Executes arithmetic processing using each of the above input data and the contents stored in each storage device. Arithmetic processing units 26 and the like are connected to each other by an internal signal bus line 27. It is being The output interface 21 is coupled to the motor driver 6. Motored As mentioned above, the driver 6 receives the command signal sent from the control device 2 and the motor. This motor is sent via the third signal line 17 from the tachometer 18 attached to the The rotational speed signals of the motor 3 are compared, and the motor 3 corresponding to the deviation signal obtained as a result of the comparison is The drive current is sent to the motor 3 via the output line 19 to drive it.

0012 Next, referring to Figures 3 to 6, we will explain the eddy current circuit, which is the main functional device of this tension control device. The general function of the latch 4 will be explained. FIG. 3 is a sectional view showing a schematic structure of an example of the eddy current clutch 4, and has a symmetrical structure. , so only the upper half is shown. Also, in Fig. 4, A in Fig. 3, A part of cross section A is shown enlarged. 3 and 4, 28 is connected to the input shaft 7 of this eddy current clutch 4. This is a disk-shaped input clutch plate whose at least the peripheral portion is molded from a magnetic material. There is a circumference around the input clutch plate 28 as shown in FIG. The magnet 29 has a north pole 29-N and a south pole 29-S arranged at equal intervals. just In the figure, reference numeral 8 indicates a cross section of this eddy current clutch output shaft. Coupled to the output shaft 8 of this eddy current clutch 4, facing the input clutch plate 28. A disc-shaped output clutch plate 3 whose at least the peripheral portion is made of magnetic material 0 is set. The output clutch plate 30 is provided with the above input clutch plate 28. A conductor 31 with low specific resistance is attached in a ring shape opposite the magnet 29. It is. By arranging the magnet 29 in the above structure, the magnetic flux φ However, the N-pole magnet 29-N, the magnetic material part of the input clutch plate 28, and the S-pole magnet The magnet 29-S circulates through the magnetic material portion of the output clutch plate 30. The input shaft 7 of the eddy current clutch 4 with the above structure is driven, and the input clutch plate 2 8 rotates, an eddy current EC is generated in the conductor 31 attached to the output clutch plate 30. This occurs as shown in 4. Therefore, the output clutch plate 30 is connected to the magnetic flux φ and the eddy current. This output clutch plate 30 receives rotational force through interaction with the EC, so the output clutch plate 30 Follows the rotation of the power clutch plate 28 at a rotation ratio according to the characteristics of the eddy current clutch 4 The eddy current clutch 4 rotates and transmits torque according to the characteristics of the eddy current clutch 4 to the output shaft 8.

[0013] The output shaft 8 of the rotating eddy current clutch 4 drives the winding core tube 9 to maintain a predetermined tension. Wind up film 10. The transmission torque of the eddy current clutch based on the above principle is shown in the schematic diagram 6 from its construction theory. It has a proportional characteristic as shown in . That is, in Fig. 6, the horizontal axis shows the input clutch. The rotational speed ratio N between the plate 28 and the output clutch plate 30, and the vertical axis shows the rotational speed ratio N. The transmitted torque T is shown. Next, we will explain the operation of the tension control device based on the above configuration and characteristics of the element devices. Ru. This is determined by the configuration of this tension control device and the functional characteristics of each element device. Various setting signals such as control condition data and arithmetic programs are input to the control device 2 in advance. The information is inputted by a predetermined means to this control device, such as the panel 22, and is input to the second storage device. It is stored in the location 24. In addition, before starting work, check the details of the work, the optimum tension for winding the film, etc. , the necessary data indicating the working conditions are inputted from the operation panel 22 and stored in the first memory device. It is stored in the location 23.

[0014] After the above-mentioned work, when the winding work is started, the output interface 2 of the control device 2 A command signal for setting the rotational speed of the motor 3 is output from the motor 1 to the motor driver 6. . The drive current output from the motor driver 6 in response to this command signal causes the above-mentioned The DC motor 3 rotates at a rotation speed according to the command signal. The rotation of this DC motor 3 The speed is measured by the tachometer 18 and fed back to the motor driver 6. The motor driver 6 compares the rotational speed command signal with the rotational speed command signal and applies the drive power to the motor 3. Correct the flow. The servo function of this motor driver is to have an integral function. The residual deviation is eliminated by It is possible to provide a certain level of responsiveness. The eddy current clutch 4 driven by the motor 3 controls the winding according to the characteristics described above. The winding core tube 9 is rotationally driven with the output torque necessary for the winding core tube 9. A first rotation detector 5 connected to the winding mandrel 9 detects a predetermined position of this winding mandrel 9. A pulse signal is output for each rotation angle of input. When the winding tube 9 rotates, the film 10 is wound up. Film 10 is pincho Since the film 10 is in close contact with the pinch rollers 11 and 12, the movement of the film 10 will cause the pinch rollers to 11 and 12 rotate. When the pinch roller 12 rotates, this pinch roller 12 The second rotation detector 13 connected to the rotating shaft of the pinch roller A pulse is output to the input interface 20 of the control device 2. In the control device 2, according to the calculation program stored in the second storage device 24, The winding is controlled by input signals from the first rotation detector 5 and the second rotation detector 13. The current winding diameter of the film onto the core tube 9 is calculated.

[0015] FIG. 7 shows output pulses from the first rotation detector 5 and the second rotation detector 13, respectively. It shows the relationship between That is, the horizontal axis represents time, and the vertical axis represents the first rotation detector 5 on the upper stage. The pulse output from the second rotation detector 13 is shown in the lower row. The first rotation detector 5 detects, for example, one revolution of the associated winding core 9, i.e. One pulse is output every 360 degrees, and n pulses are output from the second rotation detector 13 during that time. When the rotation speed is output, a second rotation detector corresponding to the circumferential length of the pinch roller 12 is detected. From the pulse interval output from 13, the film progresses during one rotation of the winding tube 9. The length of is known. That is, since the circumference of the winding core tube 9 in one rotation is known, the first memory The calculation program stored in the device 23 allows the current winding core tube to be formed. The current diameter D of the take-up roll is calculated and stored in the third storage device 25. The input/output required for the eddy current clutch 4 corresponding to the required tension as a result of the above calculation The rotation speed ratio has characteristics as shown in Figure 8. In Figure 8, the horizontal axis shows the current diameter D of the winding roll, and the vertical axis shows the eddy current corresponding to the required torque. It shows the input/output rotational speed ratio N required for the clutch. Also, from this eddy current clutch characteristic, it is possible to convert the unit of the vertical axis shown in Figure 8. Therefore, the transmission torque T of this eddy current clutch corresponding to the current diameter D of the take-up roll is It can also be seen as indicating. Under the above calculation conditions, the loss of these mechanical systems, that is, the efficiency, can be ignored and explained. As mentioned above, accurate control is possible by including efficiency in the calculation conditions in advance. Become.

[0016] After the above-mentioned arithmetic processing, the above-mentioned eddy electric current, which has been set and stored in the second storage device 24 in advance, is The required rotation for the motor 3 is determined by a calculation program that is calculated backward from the characteristics of the flow clutch 4. The arithmetic processing function 26 calculates the drive current command signal that commands the rotation speed and outputs it to the interface. output to the motor driver 6 via the face 21. That is, the winding of the film 10 on the winding tube 9 is determined by the result of the above-mentioned calculation processing. The film 10 is always wound up with a predetermined tension depending on the amount to be removed. The above explanation describes one embodiment of the present invention, and other applications are possible. It is possible to modify it. For example, the working conditions are stored in the first storage device 23, and the numerical values obtained in the calculation process are stored in the first storage device 23. are stored in separate storage devices, such as temporarily stored in the third storage device 25. As explained above, if the address is set in the same storage device and the register of the arithmetic unit is The data may be stored in the data. In addition, it is possible to set and memorize the fixed control conditions necessary for this tension control device. A floppy disk written using an external input device is read by a reading device and stored. Alternatively, the storage device 26 may be used to write predetermined information. It may also be configured with an embedded ROM. In addition, for circuit configurations other than the circuit examples described above, the configuration circuits and circuit configurations are also available. It can be used in accordance with the element parts. For example, record working conditions and control conditions. It was explained that the data is stored in a storage device and a predetermined calculation process is performed by a calculation processing device. However, it is now possible to do this using a setting memory function and arithmetic function configured by hardware. You may. In addition, the rotational speed of the DC motor 3 is measured by the tachometer 18, and the servo is increased. Although it was explained that the feedback is given to the motor driver 6 which has the function of a width gauge, The tachometer 18 may be one that outputs an analog value or one that outputs a digital value. However, either may be used depending on the circuit configuration of the servo amplifier. In addition, the measured value of the tachometer 18 is inputted to the control device 2 without being returned to the motor driver. The control device 2 may also have a function as a servo amplifier. Also, although 3 is described as a DC motor, any type of motor can be used as long as the rotation speed can be controlled. However, it is not necessary to use a motor that has good controlled performance but is expensive, such as a servo motor. do not have. In addition, the first rotation detector 5 is wound so that one pulse is generated every one rotation of the core tube, that is, every 360 degree rotation. That is, two pulses are output from the first rotation detector for each rotation of the winding tube. While the output is being output, the number of pulses output from the second rotation detector is counted and the winding roll is Although we explained how to calculate the diameter of the The calculation is made for each predetermined rotation angle or rotation speed of the heart tube. The rotation detector does not output pulses, and any rotation detector with any structure or function can be used. calculation means corresponding to the characteristics of the detector, for example, the first and second rotation detectors. Any calculation means can be used, such as calculation from the output ratio of the two. In addition, although we have explained the case where the present invention is applied to a winding core tube, Fig. Replaced with the diagram applied to the shaft, that is, the winding core tube 9 is used to wind the film. Replace the unwinding core tube and eddy current clutch 4 with an eddy current brake, and change the rotation method of the motor 3. Change the direction and the film 10 from the rolled material to the unrolled material and look at the direction of flow in the opposite direction. None, and furthermore, the unwinding core tube provided on the opposite side of this film 10 is used as the winding core tube. A drive motor with specified performance is coupled to drive this winding core tube, and the eddy current This can be done by controlling the motor connected to the brake in the same manner as described above. I can do it.

[0017]

[Effect of the idea]

As mentioned above, in the tension control device based on this invention, Or, unwind the wound material such as a film to be wound on the winding tube with a predetermined tension. Or, in a tension control device that winds the winding at a predetermined tension, the winding core In the control of An eddy current clutch that transmits data to the winding core tube generates a signal every time the winding core rotates by a predetermined angle. a first rotation detector that outputs the a second rotation detector that outputs a signal every time the pinch roller rotates by a predetermined angle; A work condition setting function that sets and stores the work conditions of the force control device, and a work condition setting function that stores the work conditions of the tension control device. A control condition setting function for setting and storing control conditions, an arithmetic processing device, and the arithmetic processing device a motor driver that amplifies the output signal of the motor to drive the motor; According to the control conditions set in the condition setting function, the data stored in the work condition setting function is The command rotation speed of the motor is determined using the output signals of the motor and the first and second rotation detectors. is calculated by the arithmetic processing unit, and the commanded rotation is sent via the motor driver. The above motor is driven at the same speed. In addition, the unwinding material such as a film wound on the unwinding core tube is unwound with a predetermined braking force. In such a tension control device, an unwinding motor that rotationally drives the unwinding core tube and an eddy current brake that transmits the rotational force of the unwinding motor to the unwinding core tube. a first rotation detector that outputs a signal every time the unwinding core tube rotates by a predetermined angle; A pinch roller assists in unwinding the roll, and the pinch roller rotates at a predetermined angle. Setting and memorizing the working conditions of the second rotation detector that generates the signal and the tension control device Condition setting function and control condition setting function that sets and stores the control conditions of the tension control device. and an arithmetic processing device, which amplifies the output signal of the arithmetic processing device to drive the unwinding motor. It is equipped with a motor driver to drive the motor, and it is equipped with a Therefore, the data stored in the working condition setting function and the outputs of the first and second rotation detectors Using the signal, the command rotation speed of the unwinding motor is calculated by the processing unit. Then, the unwinding motor is driven at the command rotation speed through the motor driver. This makes it possible to perform accurate tension control at low cost.

[0018] In addition, in controlling the winding tube, the control conditions set in the control condition setting function described above are used. The condition is outputted every time the winding core tube rotates by a predetermined angle obtained from the first rotation detector. and a rotation angle signal from the second rotation detector during the angle rotation. From the signals obtained at each angle, the winding rod wound on the winding core at that moment can be determined. The diameter of the roll is calculated, and the diameter is determined to correspond to the material of the roll that is stored in the work condition setting function. Winding at the roll diameter stored in the working condition setting function based on the winding tension Calculate the torque for the center tube and apply the eddy current torque set and stored in the control condition setting function. The rotational speed of the motor is controlled in accordance with the characteristics of the latch, and the unwinding tube is In this control, the control conditions set in the control condition setting function are the same as those set in the first control. The rotation angle signal outputted every time the unwinding core tube rotates by a predetermined angle obtained from the rotation detector. , a signal obtained from the second rotation detector for each predetermined rotation angle during the angular rotation. Calculate the diameter of the unwinding roll at that moment and record it in the work condition setting function. The working condition setting machine Calculate the brake torque for the unwinding core tube at the roll diameter stored in memory beforehand. The unwinding is performed in accordance with the characteristics of the eddy current brake set and stored in the control condition setting function. The above measurement and control can be made easier by controlling the rotational speed of the motor. It can be carried out easily and reliably. Furthermore, in controlling the winding tube, the motor driver is used to rotate the motor. Compare and amplify the rotation speed command value and the signal from the rotation speed sensor attached to the motor. The motor driver is also equipped with a servo function to control the unwinding tube. The driver uses the rotational speed command value of the unwinding motor and the rotation installed on the unwinding motor. By having a servo function that compares and amplifies the signal from the rotation speed sensor, The control performance can be further improved. Therefore, according to the present invention, accurate tension control can be achieved using an inexpensive control device. An excellent effect can be obtained in that it can be carried out.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment in which a tension control device based on the present invention is applied to control a winding core tube.

FIG. 2 is a block diagram of a control circuit in the configuration shown in FIG. 1 in which the present invention is applied to control of a winding core tube.

FIG. 3 is a half longitudinal sectional front view showing the structure of an eddy current clutch which is one element device constituting the tension control device based on the present invention.

FIG. 4 is an enlarged development view of essential parts of the eddy current clutch shown in FIG. 3, viewed in the AA direction.

FIG. 5 is a side view of the eddy current clutch shown in FIG. 3 as viewed in the BB direction.

6 is a characteristic diagram showing the relationship between the rotational speed ratio between the input rotation and output rotation of the eddy current clutch shown in FIG. 3 and the transmitted torque; FIG.

FIG. 7 shows the relationship between the first rotation detector and the second rotation detector to explain the theory of calculating the diameter of the winding core tube in the configuration shown in FIG. 1 to which the tension control device based on the present invention is applied. FIG.

FIG. 8 is a diagram showing the winding roll diameter and the effect of the structure shown in FIG.
FIG. 2 is a characteristic diagram showing the relationship between the rotational speed ratio of input rotation and output rotation of an eddy current clutch.

FIG. 9 is a perspective view showing an example in which a conventional tension control device is applied to control a winding core tube.

[Explanation of symbols]

1: Winding roll part (unwinding roll part) 2: Control device 3: Motor 4: Eddy current clutch (eddy current brake) 5: Rotation detector 6: Motor driver 9: Winding heart tube 10: Film (rolled material) (unrolled material) 11, 12: Pinch roller 13: Rotation detector 18: Tachometer

Claims (6)

[Scope of utility model registration request] [Claim 1] A tension control device that unwinds or winds up a film or the like wound on a unwinding core tube or a winding core tube with a predetermined tension. , a motor for rotationally driving the winding mandrel, an eddy current clutch for transmitting the rotational force of the motor to the winding mandrel, and a first rotation for outputting a signal every time the winding mandrel rotates by a predetermined angle. A detector, a pinch roller that assists in winding the material to be wound, a second rotation detector that outputs a signal every time the pinch roller rotates by a predetermined angle, and work for setting and storing the working conditions of the tension control device. A condition setting function, a control condition setting function for setting and storing control conditions for the tension control device, an arithmetic processing device, and a motor driver for amplifying an output signal of the arithmetic processing device to drive the motor, According to the control conditions set in the control condition setting function, the command rotation speed of the motor is calculated by the arithmetic processing unit using the data stored in the work condition setting function and the first and second rotation detector output signals. A tension control device characterized in that the motor is driven at the commanded rotational speed via the motor driver. 2. The control conditions set in the control condition setting function include a rotation angle signal outputted every predetermined angle rotation of the winding tube obtained from the first rotation detector, and From the signal obtained from the second rotation detector at each predetermined rotation angle, the diameter of the winding roll wound on the winding core tube at that moment is calculated, and the diameter of the winding roll wound on the winding core tube at that moment is calculated, and the diameter of the winding roll wound on the winding core tube at that moment is calculated. The torque to the winding tube at the roll diameter stored in the work condition setting function is calculated based on the winding tension corresponding to the material of the object, and the torque is calculated to correspond to the characteristics of the eddy current clutch set and stored in the control condition setting function. 2. The tension control device according to claim 1, wherein the rotational speed of the motor is controlled by the rotational speed of the motor. 3. The motor driver according to claim 1 or 2, wherein the motor driver has a servo function that compares and amplifies the rotational speed command value of the motor with a signal from a rotational speed sensor attached to the motor. Tension control device. [Claim 4] A tension control device that unwinds or winds up a film or the like that is wound around an unwinding core tube or a winding core tube with a predetermined tension. , an unwinding motor that rotationally drives the unwinding core tube, an eddy current brake that transmits the rotational force of the unwinding motor to the unwinding core tube, and an eddy current brake that outputs a signal every time the unwinding core tube rotates by a predetermined angle. A first rotation detector, a pinch roller that assists in unwinding the film, a second rotation detector that outputs a signal every time the pinch roller rotates by a predetermined angle, and a memory for setting the working conditions of the tension control device. a control condition setting function for setting and storing control conditions for the tension control device; an arithmetic processing device; and a motor driver for amplifying the output signal of the arithmetic processing device and driving the unwinding motor. According to the control conditions set in the control condition setting function, the command rotation speed of the unwinding motor is calculated using the data stored in the work condition setting function and the first and second rotation detector output signals. A tension control device, characterized in that the unwinding motor is driven at the commanded rotational speed through the motor driver based on calculations performed by a processing device. 5. The control conditions set in the control condition setting function include a rotation angle signal outputted every predetermined angle rotation of the unwound core tube obtained from the first rotation detector, and From the signal obtained from the second rotation detector at each predetermined rotation angle, the diameter of the unwinding roll at that moment is calculated, and the unwinding tension corresponding to the material of the unrolled material stored in the working condition setting function is calculated. Based on this, the brake torque for the unwinding core tube at the roll diameter stored in the working condition setting function is calculated, and the rotational speed of the unwinding motor is adjusted in accordance with the characteristics of the eddy current brake set and stored in the control condition setting function. 5. The tension control device according to claim 4, wherein the tension control device controls the tension. 6. The motor driver has a servo function that compares and amplifies the rotational speed command value of the unwinding motor with a signal from a rotational speed sensor attached to the unwinding motor. or the tension control device according to 5.