JPH07196249A - Tensile force control circuit for long material - Google Patents

Abstract

PURPOSE:To save the trouble of measurement and setting up of the diameter of a wound coil and to avoid the danger of the breakage of a long material at the time of starting by controlling tensile force so as to automatically attain desired tensile force then. CONSTITUTION:A divider 26 computes a torque signal T using winding diameter value which greatly decreases with the elapse of time at the beginning when a false winding diameter computing circuit 33 outputs the winding diameter value at the time of starting, and the torque of a winding out machine 3 gradually increases from its small value in accordance with the torque signal T. The tensile force of a roll paper 2 therefore also gradually increases. When the actual value of tensile force coincides with the command value of tensile force, a comparator 31 excites the first relay 32 to actuate the second relay 34, and a winding diameter signal D computed by a coil winding diameter computing circuit 24 is inputted into the divider 26 instead of the false winding diameter computing circuit 33. Thus at the time of starting, the excessive tensile force can be prevented from acting on the roll paper 2. In addition, since an adjustable computor where a deviation between the actual value and the command value of tensile force is inputted makes proportional computation at the beginning, but changes over into proportional integration computation with the action of the second relay 34, saturation can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when starting a winding / unwinding machine that winds or unwinds a long material into a coil, appropriately controls the tension to break the long material. The present invention relates to a tension control circuit for a long material, which prevents

[0002]

2. Description of the Related Art FIG. 5 is a circuit diagram showing a conventional example of tension control when a long material is unwound from an unwinder. In the conventional example circuit of FIG. 5, a roll paper 2 as a long material is wound around a drum in a coil shape, and this drum is mounted on an unwinder 3 and the roll paper 2 is pulled out in the left direction shown by an arrow. However, it is necessary to control the pull-out side pulling force and the torque of the unwinding machine 3 so that an appropriate tension is applied to the roll paper 2. If the tension is high, the roll paper 2 will be stretched and become a defective product, and in the worst case, it may be broken. Also, if the tension is low, there is a risk of slackening and wrinkling. Therefore, the tension control described below is performed.

The roll paper 2 is pulled to the left by an external force, but the speed setter 15 sets a command to rotate the unwinder 3 in the opposite direction, that is, clockwise. However, since the force to the left is strong, the unwinding machine 3 eventually rotates counterclockwise. That is, the drive motor 5 connected to the unwinder 3 via the speed reducer 4 operates in the regenerative mode.

The control circuit 10 is composed of a speed controller 11, a limiter 12, a vector operation circuit 13, and a current controller 14. The speed controller 11 includes a rotation speed detector 16
Since the deviation between the actual value of the counterclockwise polarity rotational speed output by and the speed command value of the clockwise polarity set by the speed setter 15 is input, the speed adjuster 11 is in a saturated state toward the regeneration mode. Become. The limiter 12 is the speed controller 11
Limits the torque command value output by the torque converter to the value of the torque signal T output by the divider 26. The current regulator 14 calculates the actual current value detected by the current detector 17 and the vector operation circuit 1
The deviation from the limit value in the limiter 12 obtained via 3 is input, and a control signal for making the input deviation zero is given to the inverter 6. The inverter 6 drives the drive motor 5 according to the control signal from the control circuit 10. That is, the torque of the drive motor 5 is controlled by the limiter 12.

The deviation between the actual tension value of the roll paper 2 detected by the tension detector 18 and the tension command value set by the tension setter 21 is proportional-plus-integral calculator (hereinafter abbreviated as PI calculator).
22 and the output of the PI calculator 22 and the above-mentioned tension command value are added by the adder 23. The result of the addition operation in the adder 23 is the tension signal H. On the other hand, the length of the roll paper 2 unwound by one rotation of the drum is obtained from the product of the coil winding diameter and the pi. Therefore, if the rotational speed of the unwinder 3 and the traveling speed of the roll paper 2 are known, the coil winding diameter can be calculated. Therefore, the coil winding diameter calculation circuit 24 inputs the actual rotation speed value detected by the rotation speed detector 16 and the actual traveling speed value detected by the traveling speed detector 19, and calculates the winding diameter signal D from the above-described relationship. To do.

The product of the coil winding diameter and the torque is equal to the tension. Therefore, if the divider 26 is caused to perform an operation of dividing the tension signal H by the winding diameter signal D, the operation result is the torque signal T.
Is. The torque signal T is given to the limiter 12 described above to limit the output of the speed adjuster 11 to the torque signal T.

[0007]

Even in the conventional circuit shown in FIG. 5, the unwinding machine 3 can be operated without any trouble while the unwinding machine 3 is in operation, but when the unwinding machine 3 is stopped, the coil winding diameter calculating circuit is provided. Since the actual rotational speed value and the actual traveling speed value input to 24 are both zero, the winding diameter cannot be calculated. Therefore, although not shown, a circuit is added which measures the coil winding diameter in advance and gives the measured value as an initial value to the divider 26 instead of the output signal of the coil winding diameter calculating circuit 24. However, when the coil winding diameter is large, it takes a lot of time to actually measure, and when the unwinding machine 3 is restarted after being stopped halfway,
Since it is necessary to measure the coil winding diameter each time, the measurement also takes time. In addition, there is a possibility that an error may occur in measurement or a setting error may occur. Further, depending on the structure of the unwinding machine 3, it may not be possible to actually measure it, but at this time, an approximate value or an estimated value is set.

If an inaccurate coil winding diameter or an incorrect value is given as the initial value, excessive tension may be applied to the roll paper 2 when the unwinder 3 is started, and the roll paper 2 may be broken. Will stop and cause serious damage. Therefore, an object of the present invention is to automatically control to have a desired tension at the time of start-up, to save the trouble of actual measurement and setting of the coil winding diameter, and to avoid the possibility of breaking the long material at the time of start-up. is there.

[0009]

In order to achieve the above-mentioned object, the tension control circuit for a long material of the present invention is a winding / unwinding apparatus for transferring and winding or winding a long material into a coil. In a device equipped with a machine, a tension adjusting means for outputting a tension signal obtained by an adjusting operation for matching the actual tension value of the long material with a tension command value to be separately set, a traveling speed of the long material, and A coil winding diameter calculating means for calculating the coil winding diameter from the rotation speed of the winding / unwinding machine, a divider for calculating a torque signal from the tension signal and the coil winding diameter, and an output torque of the winding / unwinding machine. In the tension control circuit for a long material, which comprises a winding / unwinding machine control means for matching the torque signal with the torque signal, the maximum value of the coil winding diameter is used as a starting point to reduce the value over time. A pseudo winding diameter calculating means for outputting; Tension coincidence detection means for detecting coincidence between the actual force value and the tension command value is provided, and the pseudo winding diameter calculating means is used instead of the output of the coil winding diameter calculating means when starting the winding / unwinding machine. Is given to the divider,
It is assumed that the output of the coil winding diameter calculating means is input to the divider when the tension matching detecting means detects the tension matching.

Alternatively, the pseudo winding diameter calculating means for outputting the maximum value of the coil winding diameter as a starting point and reducing the value with the passage of time, and the tension for detecting the coincidence between the actual tension value and the tension command value Coincidence detecting means, the tension adjusting means includes a proportional calculating element and an integral calculating element, and when the winding / unwinding machine is started, the pseudo winding is used instead of the output of the coil winding diameter calculating means. The output of the diameter calculating means is given to the divider, the tension adjusting means is adjusted by a proportional calculating element, and the output of the coil winding diameter calculating means is output when the tension matching detecting means detects the tension matching. In addition to inputting to the divider, the tension adjusting means performs the adjusting operation in the integral calculating element or the adjusting operation in the proportional integral calculating element.

[0011]

[Operation] When a long material is wound or unwound into a coil, an appropriate tension must be applied to this long material. This tension depends on the coil winding diameter and the winder / unwinder torque. Is equal to the product of and. Here, the coil winding diameter is calculated from the traveling speed of the long material and the rotation speed of the winder / unwinder,
Since there is no speed data at startup, the coil winding diameter is actually measured and set as an initial value. However, if it is difficult to measure the coil winding diameter and the value is incorrect or there is a setting error, excessive torque is applied and the long material is cut.

In the present invention, the value corresponding to the maximum coil diameter is output at the time of starting, but the torque signal T is calculated by using the pseudo winding diameter calculating means whose output value gradually decreases with the passage of time. Since the torque at start-up is small and therefore the tension is also small, the tension gradually increases and when the actual tension value detected by the tension detector matches the tension command value, the pseudo winding diameter calculation means The output is switched to the coil winding diameter calculating means for calculating the winding diameter from the traveling speed and the rotation speed, and it is possible to prevent excessive tension from being applied to the long material at the time of starting.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing a first embodiment of the present invention. Roll paper 2 as a long material, unwinder 3, and speed reducer shown in the circuit of the first embodiment. 4, a drive motor 5, an inverter 6, a power supply 7, a speed controller 11, a limiter 12, a vector calculation circuit 13, and a current controller 14 as components, a control circuit 10, a speed setter 15, a rotation speed detector 16 , The current detector 17, the tension detector 18, the traveling speed detector 19, the tension setter 21, the PI calculator 22, the adder 23, the coil winding diameter calculation circuit 24, and the divider 26 have the following names, uses, and functions: Since this is the same as the case of the conventional circuit described above with reference to FIG. 5, description thereof will be omitted.

In the first embodiment circuit of FIG. 1, the coil winding diameter value calculated by the coil winding diameter calculating circuit 24 for inputting the actual traveling speed value of the long material and the actual rotation speed value of the unwinder 3, The second relay contact 34B and the second relay contact 34C select one of the coil winding diameter values output from the pseudo winding diameter calculating circuit 33, and the selection result is given to the divider 26 via the soft start / stop circuit 25. . That is, the divider 26 calculates either the output of the coil winding diameter calculation circuit 24 or the output of the pseudo winding diameter calculation circuit 33 as the winding diameter signal D to calculate the torque signal T, and the limiter 12 outputs this winding diameter signal D. Is output. Further, the first of FIG.
In the embodiment circuit, the roll paper 2 detected by the tension detector 18 is used.
The actual value of the tension of No. 2 is compared with the tension command value set by the tension setter 21, and when there is a difference between the two, the first relay 32 is not excited, but the difference between the two becomes zero. At that time, the first relay 32 becomes excited.

FIG. 2 is a pseudo winding diameter calculation circuit 33 shown in FIG.
Is a graph showing the change in the output of, where the horizontal axis represents time and the vertical axis represents winding diameter. That is, the pseudo winding diameter calculation circuit 33 initially outputs a large winding diameter value, but with the passage of time, this winding diameter value gradually decreases and eventually becomes zero. FIG. 3 is an operation circuit diagram showing the operation of the second relay 34 shown in FIG. In FIG. 3, the operation command contact 35 is a contact interlocked with the operation command of the unwinder 3 shown in FIG.
The operation command contact 35 is turned on at the same time when the operation of the unwinder 3 is started. Since there is a difference between the actual tension value of the roll paper 2 and the tension setting value immediately after the start-up, as described above, the first relay 32 is not excited and the second relay 34 is also not excited. Therefore, the second relay contact 34B (normally closed contact) shown in FIG.
The second relay contact 34C (normally open contact) is in the illustrated state, and the winding diameter value output from the pseudo winding diameter calculating circuit 33 is input to the divider 26 via the soft start / stop circuit 25 as the winding diameter signal D. . Since the winding diameter value output from the pseudo winding diameter calculation circuit 33 decreases from a large value as described above, the torque signal T as the calculation result of the divider 26 is initially small, but increases with the passage of time. Will be done.

As the torque signal T increases, the tension applied to the roll paper 2 also increases, and when this coincides with the tension command value set by the tension setter 21, the first relay 32 is energized, and the circuit of the circuit described in FIG. The second relay contact 32A turns on and the second
The relay 34 is excited and the second relay contact 34A is turned on to maintain the excited state. By exciting the second relay 34, the second relay contact 34B shown in FIG. 1 is turned off and the second relay contact 34C is turned on. Therefore, instead of the output of the pseudo winding diameter calculation circuit 33, the coil winding diameter calculation circuit is output. The winding diameter value calculated by 24 is output as a winding diameter signal D to the divider 26 via the soft start / stop circuit 25. The soft start / stop circuit 25 alleviates fluctuations when the output of the pseudo winding diameter calculation circuit 33 is switched to the output of the coil winding diameter calculation circuit 24.

FIG. 4 is a circuit diagram showing a second embodiment of the present invention. In this second embodiment circuit, instead of the PI calculator 22 for inputting the deviation between the actual tension value and the tension command value. P /
The point that the PI calculator 36 is provided and that the second relay contact 34D is provided to switch between the proportional calculation (P calculation) and the proportional integral calculation (PI calculation) of the P / PI calculator 36, The circuit is different from the circuit of the first embodiment described above, and the other operations are the same as those of the circuit of the first embodiment.

In the second embodiment circuit of FIG. 4, when the unwinding machine 3 is started, the second relay contact 34D (normally open contact) is off as shown in the figure, and the P / PI calculator 36 is turned on. Although it is operated as a P calculator, the second relay contact 34D is turned on when the first relay 32 is excited, that is, when the deviation between the actual tension value and the tension command value becomes zero, and the P / P
The I calculator 36 switches from the P calculator until then to the PI calculator. That is, even if the input deviation is large when the unwinding machine 3 is started, the P computing unit can avoid saturation.

[0019]

In the conventional winding / unwinding machine, the coil winding diameter cannot be calculated because the traveling speed data and the rotation speed data of the long material at the time of starting cannot be obtained. The torque of the machine was not properly controlled. Therefore, the coil winding diameter was measured and set as the initial value before starting.However, it is often difficult to measure the coil winding diameter, and the measured value may be inaccurate or setting error may occur. is there. As a result, there is a risk that excessive tension may be applied to the long material at the time of start-up and the material may be cut.

In the present invention, when the winding / unwinding machine is started, a large winding diameter value is output, but a pseudo winding diameter calculating means is provided for reducing the output with the passage of time. By calculating the torque signal T using the winding diameter value output by the winding diameter calculating means, the output torque of the winding / unwinding machine gradually increases. When the tension increases with the torque and the actual tension value matches the tension command value, the output of the pseudo winding diameter calculation means is switched to the output of the coil winding diameter calculation means for calculating the winding diameter from the traveling speed and the rotation speed. , Eliminates the possibility of applying excessive tension to long materials. Therefore, it is possible to obtain the effect of omitting the trouble of measuring and setting the coil winding diameter at the time of startup, and the effect of avoiding the inconvenience that the long material is broken and the operation is interrupted due to incorrect measurement or setting error Obtained together.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a graph showing a change in output of a pseudo winding diameter calculation circuit 33 shown in FIG.

3 is an operation circuit diagram showing the operation of a second relay 34 shown in FIG.

FIG. 4 is a circuit diagram showing a second embodiment of the present invention.

FIG. 5 is a circuit diagram showing a conventional example of tension control when a long material is unwound from an unwinder.

[Explanation of symbols]

 2 Roll paper as long material 3 Unwinder 5 Drive motor 6 Inverter 10 Control circuit 11 Speed controller 12 Limiter 13 Vector arithmetic circuit 14 Current controller 15 Speed setter 16 Rotation speed detector 17 Current detector 18 Tension detection Device 19 Travel speed detector 21 Tension setting device 22 PI calculator 23 Adder 24 Coil winding diameter calculation circuit 25 Soft start / stop circuit 26 Divider 31 Comparator 32 1st relay 32A 1st relay contact 33 Pseudo winding diameter calculation circuit 34th 2 relay 34A 2nd relay contact 34B 2nd relay contact 34C 2nd relay contact 34D 2nd relay contact 35 Operation command contact 36 P / PI calculator D Roll diameter signal H Tension signal T Torque signal

Claims (2)

[Claims] 1. A device equipped with a winding / unwinding machine for transferring a long material and winding or unwinding it into a coil, wherein a tension command value for separately setting an actual tension value of the long material. Tension adjusting means for outputting a tension signal obtained by the matching operation, and coil winding diameter calculating means for calculating the coil winding diameter from the traveling speed of the long material and the rotation speed of the winding / unwinding machine. A long material provided with a divider for calculating a torque signal from a tension signal and a coil winding diameter, and a winding / unwinding machine control means for matching the output torque of the winding / unwinding machine with the torque signal. In the tension control circuit, the pseudo winding diameter calculating means for outputting the maximum value of the coil winding diameter as a starting point and reducing the value with the passage of time, and the tension for detecting the coincidence between the actual tension value and the tension command value And a matching detection means, When the unwinder is started, the output of the pseudo winding diameter calculating means is applied to the divider instead of the output of the coil winding diameter calculating means, and the tension matching detecting means detects the tension matching at the time point. A tension control circuit for a long material, characterized in that the output of the coil winding diameter calculating means is input to the divider. 2. A device equipped with a winder / unwinder for transferring a long material and winding or unwinding it into a coil, wherein a tension command value for separately setting the actual tension value of the long material. Tension adjusting means for outputting a tension signal obtained by the matching operation, coil winding diameter calculating means for calculating the coil winding diameter from the traveling speed of the long material and the rotation speed of the winding and unwinding machine, and these tensions. Tension of a long material provided with a divider for calculating a torque signal from a signal and a coil winding diameter, and a winding / unwinding machine control means for matching the output torque of the winding / unwinding machine with the torque signal. In the control circuit, the pseudo coil diameter calculation means for outputting the maximum value of the coil coil diameter as a starting point and reducing the coil coil value with the passage of time, and the tension matching for detecting the coincidence between the actual tension value and the tension command value And a tension detecting means for adjusting the tension. The means includes a proportional calculation element and an integral calculation element, and when starting the winding and unwinding machine, instead of the output of the coil winding diameter calculating means, the output of the pseudo winding diameter calculating means is given to the divider. At the same time, the tension adjusting means is adjusted by a proportional calculation element, and when the tension coincidence detecting means detects the coincidence of tensions, the output of the coil winding diameter calculating means is input to the divider, and the tension adjusting means is provided. Is a tension control circuit for a long material characterized by performing an adjusting operation by an integral calculation element or an adjusting operation by a proportional integral calculation element.