JPH0712883B2 - Tension controller for long material winding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tension control device for a long material take-up machine in a process of winding and unwinding rolls of chemical fibers, electric wires, papers, various sheets, tapes and the like. Regarding

[Prior Art] There is a work process in which a long material such as a heating wire and a thin strip is subjected to processing such as wire drawing, rolling and heat treatment and then wound around a drum again. In that process, an excessive tension is applied to the material. If added, a strong stretching force acts only on that part, which causes deterioration of quality or, in the worst case, product defects such as disconnection.

Therefore, in the roll winding process of the product, an absolute condition for always keeping the tension applied to the product constant is required.

Therefore, there is a conventional tension control device for keeping the tension applied to the material in the long material winding process constant, and an example thereof is shown in FIG.

In the figure, the material 4 fed from the feeding drum 11 fixedly fitted to the rotary shaft of the feeding DC electric motor 2 is
It is adapted to be sequentially wound on a winding drum 3 which is fixedly fitted to a rotating shaft of a winding DC electric motor 1.
Moreover, in the middle of this material 4, the pulley 5 of the dancer roller 7
Also, the pulley 6 is suspended, and the rotation support rod 8 of the dancer roller 7 has a coil spring 9 and a potentiometer.
10 are connected.

When a pulling force acts on the material 4 by winding the drum 3, the dancer roller 7 is rotated counterclockwise, and the dancer roller 7 is locked at a point P2 where the pulling force and the restoring force of the coil spring 9 balance each other.

The rotation angle r1 from the neutral line P1 of the dancer roller 7 is measured by the potentiometer 10, and the speed control circuit 12 adjusts and increases the rotational speed of the motor 2 based on the resistance value of the potentiometer 10 to turn the dancer roller 7 on. P2 to neutral line P1
I am trying to return to the direction.

However, when the feeding speed of the product 4 from the feeding drum 11 by the motor 2 follows the winding speed of the winding drum 3, the traction force applied to the product 4 is reduced, so that the dancer roller 7 is restored by the coil spring 9. Contrary to the above, it will rotate to the right.

On the contrary, when the winding speed of the winding drum 3 is lowered for some reason, the traction force applied to the material 4 is reduced, and the restoring force of the coil spring of the dancer roller 7 becomes dominant, and the dancer roller 7 is turned back to the dotted line P3. It will be locked dynamically.

Therefore, the changed rotation angle r2 is again measured by the potentiometer.
Potentiometer 10 measured with 10 and proportional to its angle r2
The speed control circuit 12 controls the rotation speed of the motor 2 to decrease from the resistance value indicated by.

As described above, the conventional tension control device adjusts the tension applied to the material 4 by adjusting the rotation speed of the feeding drum 11 with respect to the rotation speed of the winding drum 3 using the dancer roller 7.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional device, the tension applied to the material 4 is determined by the restoring elastic force of the coil spring 9, and the elastic force of the coil spring 9 is used to adjust the tension. It must be adjusted or the coil spring 9 itself must be replaced.

Therefore, the actual tension applied to the material 4 cannot be freely increased or decreased during the winding operation due to its mechanism, and the potentiometer 10 does not directly measure the tension of the material 4. Based on the rotation angle of the dancer roller 7 that rotates against the restoring force of the coil spring 9, the material 4
Since the tension of the coil 4 is indirectly measured, it is difficult to apply the desired tension to the material 4 when the elastic force of the coil spring 9 is deteriorated due to a change over time. It is not clear whether or not.

In addition, since the coil spring 9 has elasticity, the material 4
If a slight vibration occurs, the swing of the dancer roller 7 will increase, and the output of the potentiometer 10 will not be stable, making it difficult to control the rotational speed of the motor 2 correctly.

Moreover, if the sensitivity of the potentiometer 10 is lowered in order to prevent the malfunction of the control circuit 12 due to the swing of the dancer roll, the followability of the rotational change of the feeding drum 11 to the rotational change of the take-up drum 3 becomes worse. As a result, the tension applied to the material 4 becomes uneven.

The present invention provides a tension control device capable of always applying an optimum tension to a material by directly measuring the tension applied to the material and adjusting the winding speed of the material in response to the variation in the tension.

[Means for Solving the Problems] In order to solve the above problems, a tension control device for a long material winding machine according to the present invention includes (a) a drum that is rotated by a feeding motor and a winding motor. A pressure sensor that directly detects the tension applied to the long material wound around the rotated drum. (B) A comparison amplification circuit that compares the tension detection output signal from the pressure sensor with the set tension signal that serves as the tension reference. (C) Up-down count data from a counter circuit to which an operating voltage setting circuit, a dead zone adjusting circuit, a first upper and lower limit value comparing circuit, a logical operation circuit and a variable frequency transmitting circuit are connected is input. Compensation circuit section including a digital-analog conversion circuit and a second upper and lower limit value comparison circuit (d) A signal obtained by passing the output from the tension detection section through a first variable resistor, Superimposing circuit unit for superimposing the signal from the circuit unit through the second variable resistor on the basic voltage signal from the variable voltage generator (e) One of the motors according to the output signal from the superimposing circuit unit. The motor servo driver circuit for controlling the rotation speed of the above to adjust the tension applied to the long material to a constant level is constituted by the above (a) to (e).

[Operation] The tension applied to the long material is directly detected by the pressure sensor, and the tension detection unit compares the detected pressure sensor output with the desired tension given in advance, and amplifies the difference and outputs.

Further, the output voltage value of the variable voltage generator is adjusted according to the rotation speed of the uncontrolled motor.

In the compensating circuit section, the up-down counter circuit counts according to the output change of the tension detecting section, and the output data of the counter circuit is converted into an analog signal by the digital-analog converting circuit. This is a correction signal that compensates for changes in the output of the unit.

Therefore, the output of the variable voltage generator is superimposed on the output of the tension detecting unit and the correction signal via the variable resistors provided in each unit to synthesize the speed command signal. By inputting this speed command signal to the motor servo driver circuit and controlling the speed of the motor, the tension applied to the material is adjusted.

Embodiment An embodiment of the present invention will be described in detail below with reference to FIG.

The feeding drum 12 and a tachometer generator (TG) 39 are connected to the rotating shaft of the DC servo motor 13.

In addition, the long material fed from the feeding drum 12
The guide roller 14 is guided by a guide roller 15 and hung on a dancer roller 17, and further guided by a guide roller 18 and wound on a winding drum 19.

The winding drum 19 is connected to the rotary shaft of the DC servomotor 20, and the tachometer generator (TG) 43 is also connected to the rotary shaft.

The dancer roller 17 is attached to one end of a dancer arm 16 rotatably supported by a fulcrum 21a provided upright on a base 21, and the pressure sensor 22 is attached to the other end of the dancer arm 16.
Is attached.

The output signal S1 of the pressure sensor 22 is input and amplified by the pressure sensor amplifier 23 of the tension change detection unit 100, and the output signal S2 of the amplifier 23 is input to one terminal of the comparison and amplification circuit 24.

A slide tap terminal of a variable resistor VR1 connected to a reference voltage generator 25 that outputs a constant voltage is connected to the other input terminal of the comparison and amplification circuit 24. This variable resistor VR
Reference numeral 1 is attached to a control panel (not shown) so that the operator can freely move the slide tap. This variable resistor VR1 is for setting the tension value of the material 14.

Therefore, the output signal S4 of the comparison amplifier circuit 24 is supplied to the operating voltage setting circuit 2 of the compensation circuit section 102 through the input protection resistor R1.
6 and also to one input terminal of the operational amplifier 35 of the superposition circuit unit 101 via the variable resistor VR2.

The other input terminal of the operational amplifier 35 is connected to the ground via the resistor R2.

The output of the operating voltage setting circuit 26 is connected to the dead zone adjusting circuit 27, and the output of the dead zone adjusting circuit 27 is input to the limit comparator circuit 28. The output terminal of this limit comparator circuit 28 is a logical operation circuit 29.
Is connected to the first input terminal of.

The output terminal of this logical operation circuit 29 is up / down (U / D)
It is connected to the counter circuit 30, and the output of the variable frequency oscillator 32 is input to the U / D counter circuit 30. A variable resistor RV4 is connected to the oscillator 32, and the variable resistor RV4 is provided on the control panel so that the operator can freely change the resistance value. The variable resistor RV4 changes the oscillation frequency of the variable frequency oscillator 32.

Further, the U / D counter circuit 30, the oscillator 32, and the D / A conversion circuit 31
Is a 4000B series C-MOS IC and does not require an interface circuit with other analog circuits.

The output of the U / D counter circuit 30 is input to the digital-analog (D / A) conversion circuit 31, and the output of the D / A conversion circuit 31 is input to the input terminal of the amplifier 40.

The output of this amplifier 40 is a variable resistor installed on the control panel.
It is input to the input terminal of the limiter circuit 37 of the superposition circuit unit 101 through RV3, and the limit comparator circuit 33
It is also input to the input terminal of. The output of the limit comparator circuit 33 is input to the second input terminal of the logical operation circuit 29.

The operational amplifier 36 is connected to the input terminal of the limiter circuit 37.
The output terminal of, the anode terminal of the Zener diode ZD1 and one terminal of the resistor R6 are similarly connected, and the output terminal of this limiter circuit 37 is the other terminal of the resistor R6 and the cathode terminal of the Zener diode ZD1. The input terminals of the motor servo driver circuit 38 are connected to each other.

The output signal of T.G39 is input to the driver circuit 38, and the output of the driver circuit 38 is the DC servo motor.
It is input to the drive voltage input terminal of 13.

Further, the output signal S18 of the operational amplifier 35 is superimposed on the output signal S19 of the variable voltage generating circuit 34 via the resistor R4 and then input to one terminal of the operational amplifier 36 via the resistor R3.

The other input terminal of the operational amplifier 36 is connected to the ground via the resistor R5.

Next, regarding the winding motor 20, the output of the motor servo driver circuit 41 is input to the drive voltage input terminal thereof, and this driver circuit 41 has the above-mentioned T.G43.
The output of is input.

Further, the driver circuit 41 includes the variable voltage generating circuit 34 described above.
In addition to outputting the signal S17, the detection signal S15 obtained by measuring the diameter of the remaining material 14 of the optical sensor 42 provided near the feeding drum 12 is input to the variable voltage generating circuit 34.

When the above-mentioned circuit elements are roughly classified according to their functions, the group of the pressure sensor amplifier 23, the reference voltage generator 25, and the comparison amplification circuit 24 is the tension change detection unit 100, and the groups of the operational amplifiers 35 and 36 and the limiter circuit 37 are In the superposition circuit unit 101, the operating voltage setting circuit 26, the dead zone adjusting circuit 27, the logical operation circuit 29, U /
A group of the D counter circuit 30, the D / A conversion circuit 31, the amplifier 40, and the like is the compensation circuit unit 102.

Each functional operation in the above configuration will be described below.

The operator operates a control panel (not shown) to wind the drum.
When the winding rotation speed of 19 is set, the driver circuit 41 controls the motor 20 by adjusting the speed control voltage signal S14 output to the motor 20 while comparing it with the rotation instruction signal S16 of T.G43. At the same time, the driver circuit 41 outputs a signal S17 based on the rotation speed of the motor 20 to the variable voltage generation circuit 34.

This variable voltage generation circuit 34 supplies a basic voltage signal S19 representing the minimum commanded rotation speed of the control signal S11 to the motor servo driver circuit 38 which controls the rotation speed of the DC servo motor 13 rotating the feeding drum 12. This basic voltage signal S19 is output and is determined based on the signal S17 and the detection signal S15 of the optical sensor 42 that measures the outer diameter of the residual material 14 of the drum 12.

That is, when the material 14 is fed from the feeding drum 12, the remaining outer diameter of the drum 12 is reduced, or when the number of rotations of the motor 20 is increased by the operator, the voltage level of the voltage signal S19 is increased to increase the motor. The rotation speed of the motor 13 controlled by the servo driver circuit 38 is appropriately increased.

On the contrary, when the outer diameter of the residual material 14 in the drum 12 is large or the rotation speed of the motor 20 is low, the variable voltage generation circuit 36 reduces the rotation speed of the motor 13 by the signal S19. The voltage level is being lowered.

Then, as the motor 20 rotates, the take-up drum 19 is made of material sequentially.
When the material 14 is wound up, tension is applied to the material 14, so that the dancer roller 17 on the way of the material 14 is turned up and the dancer arm 16 is rotated, and pressure is applied to the pressure sensor 22.

Then, the pressure sensor amplifier 23 amplifies the detection signal S1 of the pressure sensor 22 and outputs the signal S2 to the comparison and amplification circuit 24. The voltage level amplified by the signal S2 is when the tension of the material 14 is zero. Is set to 0 V and 10 V when the tension of the material 14 is maximum.

Furthermore, this signal S2 is the material 14 set by the operator.
Is compared with the signal S3 indicating the set tension of the signal in the comparison / amplification circuit 24. The comparison / amplification circuit 24 amplifies the difference between the two signals S2 and S3 and superimposes it on the 5V voltage, and the superposed signal S4. It outputs to the unit 101 and the compensation circuit unit 102, respectively.

That is, the signal S4 is represented by the following equation S4 = 5 + (S2-S3) * [alpha] [V]. However, α indicates the amplification factor.

The functional operation of the compensation circuit unit 102 will be described in detail below.

The operation setting circuit 26 in the compensation circuit unit 102 determines whether or not the amount of deviation between the desired tension of the material 14 and the tension actually applied by the operator by the input signal S4 is within the allowable value. The discrimination signal S5 is output to the dead zone adjusting circuit 27.

Further, the dead zone adjusting circuit 27 outputs a signal S6, which is obtained by removing the vibration, to the limit comparator circuit 28 when the signal S5 indicating that the actual tension of the material 14 has largely deviated from the desired tension is slightly vibrating. There is. This is because when the dancer arm 16 slightly oscillates due to the elasticity of the material 14, the actual tension value output from the pressure sensor amplifier 23 slightly oscillates, and this compensation circuit unit is configured to correct the minute oscillation of the actual tension. If the 102 always operates, the rotation speed of the motor 13 repeats a minute change by the method described below, so that hunting occurs in the tension of the material 14. Dead band adjustment circuit
27 serves to absorb the minute vibration of the input signal S5 in order to prevent this hunting. In other words, the feedback loop functions to prevent howling.

However, the dead zone adjusting circuit 27 outputs a signal S6 to the next limit comparator circuit 28, and the limit comparator circuit 28 checks whether the voltage level of the signal S6 is within a predetermined upper limit value or lower limit value. After determining, the output signal S7 is output to the logical operation circuit 29.

Further, the logical operation circuit 29 performs a logical operation of the output signal S8 of the limit comparator circuit 33 different from the above and this signal S7, and outputs a signal D1 for controlling the counting operation of the U / D counter circuit 30 from the result. is doing.

That is, when the signal S7 indicating that the actual tension of the material 14 has decreased below the set tension is input, the command signal D1 that causes the U / D counter circuit 30 to count up, on the contrary, the actual tension of the material 14 exceeds the set tension. Command signal D that causes the U / D counter circuit 30 to count down when the signal S7 indicating that it has risen is input
The logical operation circuit 29 outputs 1.

Furthermore, the frequency of the clock signal D2 of the oscillator 32 input to the U / D counter circuit 30 is changed by the variable resistor VR4, but the count change of the U / D counter circuit 30 is changed by the high frequency clock signal D2. It becomes faster and the count change becomes slower with the low frequency clock signal D2.

This is to adjust the correction speed of the tension of the material 14, U / D
If the count change of the counter circuit 30 is fast, the change in the actual tension of the material 14 is attempted to be corrected faster, and conversely U /
If the count change of the D counter circuit 30 is slow, the change in the actual tension of the material 14 is gently corrected.

Further, the output data D3 of the U / D counter circuit 30 is converted into an analog signal D4 by the D / A conversion circuit 31, and then amplified by the amplifier 40 to form a compensation signal S9, which is output to the superposition circuit 101.

Further, the limit comparator circuit 33 determines whether or not the compensation signal S9 has a voltage level within the upper limit and lower limit values given in advance, and outputs the result as the signal S8 to the logical operation circuit 29 described above. If the U / D counter 30 is an 8-bit counter and the count data D3 exceeds FF (HEX), 00 (H
This is provided for the purpose of preventing the voltage of the compensation signal S9 from suddenly changing from the maximum value to the minimum value.

In this way, the displacement between the actual tension of the material 14 and the desired tension is detected by the tension change detection unit 100, and the compensation circuit unit 102 generates the compensation signal S9 according to the detected signal S4.

Next, the function of the superposition circuit unit 101 will be described below.

This superimposing circuit section 101 has an output signal S19 of the variable voltage generating circuit 34.
And the output signal S4 of the tension change detection unit 100 and the compensation circuit unit 1
The compensating signal S9 output from 02 is superimposed and the feeding side motor 13
The speed command signal S11 is output to the motor servo driver circuit 38 that controls the variable resistor VR2 and VR3 in order to adjust the amount of superposition of the signal S4 and the compensation signal S9 when superposed. I am using.

That is, when the resistance value of the variable resistor VR2 is lowered, a large amount of the output signal S4 of the tension change detection unit 100 is input to the driver circuit 38, and the actual tension change of the material 14 is immediately transmitted to the motor 13.
It will be fed back to the rotation speed of.

Conversely, increase the resistance value of the variable resistor VR2,
When the resistance value of R3 is reduced, the change in the actual tension of the material 14 is corrected only by the compensation signal S9 generated by the compensation circuit section 102.

Further, the limiter circuit 37 of the superposition circuit unit 101 is for protecting the input of the motor servo driver circuit 38, and prevents a signal of 10 V or more and 0 V or less from being input to the input terminal of the driver circuit 38.

Further, the driver circuit 38 outputs the control voltage signal S12 to the motor 13 while comparing the rotation speed of the DC servo motor 13 with the signal S13 detected in T.G39 according to the speed command signal S11.

The overall functional operation will be described below with reference to FIG.

The graph at the top of Fig. 2 shows the output signal S5 of the operating voltage setting circuit 26.
The voltage change of the material 14 is approximately represented, and the difference from the desired tension of the material 14 is approximately represented. Further, the graph at the bottom of FIG. 2 shows the speed command signal S1 for the motor servo driver circuit 38.
1 represents the voltage change, and the interval L3 represents the dead band width of the dead band adjusting circuit 27.

It is assumed that the tension of the material 14 sharply decreases at time t1.
However, in this case, the speed correction in FIG. 2 is performed only by the compensation circuit unit 102 in which the resistance value of the variable resistor VR2 is maximized and the resistance value of the variable resistor VR3 is set to 0.

When the tension of the material 14 decreases, the logical operation circuit 2 of the compensation circuit 102
9 commands the U / D counter circuit 30 to perform a count-up operation, and as a result, the voltage level of the compensation signal S9 increases stepwise. With the compensation signal S9 whose level has risen, the voltage of the speed command signal S11 rises as shown in the lower left of FIG.

As a result, the rotation speed of the feeding-side motor 13 is increased, and when the tension is restored to the predetermined tension at time t2, the U / D counter circuit 30
Stops counting Up and enters a steady state.

On the contrary to the above, when the tension of the material 14 increases at time t3, the logical operation circuit 29 causes the U / D counter circuit 30 to count D
The own operation is commanded, and as a result, the voltage level of the compensation signal S9 is gradually decreased, and the speed command signal S11 is voltage-decreased as shown in the lower right part of FIG.

As a result, the rotation speed of the motor 13 on the feeding side is reduced and the tension is restored to the predetermined tension at time t4.

The time interval L1 in FIG. 2 is a value determined by the oscillation frequency of the oscillator 32. If the frequency is increased, this interval L1
L1 becomes shorter, and if the frequency is lowered, the interval L1 becomes longer and the correction operation becomes slower.

Further, the voltage interval L2 represents the amount of addition of the compensation signal S9 by the variable resistor VR3 to the speed command signal S11, and the variable resistor VR3
If the resistance value of is set to a low value, the voltage of the speed command signal S11 will rise faster.

As described above, the set tension of the material 14 is adjusted to adjust the rotation speed of the motor 13 that rotates the feeding drum 12, and the winding peripheral speed of the material 14 on the winding drum 19 and the material 14 on the feeding drum 12 are adjusted. Although the feeding speed of the material is made equal, the actual tension is directly measured by the pressure sensor 22 of the dancer arm 16 provided with the dancer roll 17 suspended in the middle of the material 14 and the deviation amount between the desired tension and the measured tension is measured. Is detected by the tension change detection unit 100, the compensation circuit unit 102 generates a compensation signal S9 for correcting the displacement amount, and the superposition circuit unit
At 101, the output signal S19 of the variable voltage generation circuit 34, the output signal S4 of the tension change detection unit 100, and the compensation signal S9 are appropriately attenuated by the variable resistors VR2 and VR3, and are superposed on each other so that the motor servo on the feeding side is superimposed. The speed command signal S11 to the driver circuit 38 is changed to adjust the rotation speed of the feeding side motor 13.

As a result, the deviation between the actual tension of the material 14 and the set tension can be directly fed back to the adjustment of the rotation speed of the feeding motor 13, and a loose and large deviation from the set tension can be corrected by the compensation circuit section 102. In order to adjust the rotation speed of 13, even if the rotation speed of the winding motor 20 is any rotation speed from 0 to the effective rotation speed limit of the motor 20,
The rotation speed of the feeding motor 13 can be controlled so that the tension of the material 14 can always be maintained at a predetermined value.

Further, in the above example, the speed of the feeding-side motor 13 is controlled, but the speed of the winding-side motor 20 may be controlled.

That is, the motor controlled by the motor servo driver circuit 41 may be the feeding motor 13, and the motor controlled by the motor servo driver circuit 38 may be the winding motor 20.

Further, although the U / D counter circuit 30 and the D / A converter circuit 31 are 8 bits in the above example, they may be 16-bit U / D counter circuits and D / A converter circuits.

[Advantages of the Invention] As described above, according to the present invention, the tension applied to a material is adjusted by directly measuring the tension of the material with a pressure sensor operated by a dancer roll suspended in the middle of the material and feeding the material. Alternatively, the tension applied to the material is adjusted by controlling the rotation speed of the winding motor. Moreover, the rotation speed instruction signal of the motor to be controlled is generated by superimposing three kinds of signals. One is a signal according to the rotation speed of the other motor which is not controlled, and the other one is the pressure sensor. It is the detected tension change signal, and the other one is the correction signal generated by the compensating circuit unit configured by a counter circuit or the like.

Furthermore, when the tension change signal and the correction signal are superposed, the superposition amount can be adjusted by the variable resistor, so that the tension control can be performed according to the elasticity and hardness of the material. it can.

For example, in the case where the material is rich in elasticity and the tension change signal from the pressure sensor vibrates greatly, the amount of the tension change signal to be superimposed is changed to increase the superimposition amount of the correction signal. On the contrary, for a material having high hardness, the amount of superposition of the tension change signal may be increased and the amount of superposition of the correction signal may be decreased.

Therefore, since a coil spring or the like as in the past is not required, the tension applied to the material can be freely set and adjusted without mechanical restrictions, and the tension can be changed even during the working process without stopping the machine. It is possible.

Moreover, since the tension itself is directly measured by the pressure sensor, the tension can be set extremely accurately.

Furthermore, since the compensation circuit part compensates for the large and loose changes in tension, the tension could not be set sufficiently due to the spring etc. at the start of material winding as in the past. According to the present invention, it is possible to always adjust to a desired tension regardless of any change in the moving speed of the material.

[Brief description of drawings]

 FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is an operation diagram of the present invention, and FIG. 3 is a diagram showing a conventional example. 12 in the figure: Feeding drum 13: DC servomotor, 14: Long material 15: Guide roller, 16: Dancer arm 17: Dancer roll, 18: Guide roller 19: Take-up drum 20: DC servo motor, 21 …… stand 21a …… fulcrum, 22 …… pressure sensor 23 …… pressure sensor up 24 …… comparison amplification circuit 25 …… reference voltage generator 26 …… operating voltage setting circuit 27 …… dead zone setting circuit 28 …… Limit comparator circuit 29 …… Logic operation circuit 30 …… Up-down counter circuit 31 …… Digital-analog converter circuit 32 …… Variable frequency oscillator 33 …… Limit comparator circuit 34 …… Variable voltage generator circuit 35 …… Op-amp 36 …… operational amplifier, 37 …… limiter circuit 38 …… motor servo driver circuit 39 …… tachometer generator 40 …… amplifier 41 …… motor servo driver circuit 42 …… optical sensor 43 …… Kometa generator 100 ...... tension change detection unit, 101 ...... superimposition circuit portion 102 ...... compensating circuit unit

Claims (1)

[Claims] 1. A pressure sensor for directly detecting tension applied to a long material wound from a drum rotated by a feeding motor to a drum rotated by a winding motor. Tension detection section provided with a comparison and amplification circuit for comparing the tension detection output signal of the above-mentioned and a set tension signal as a reference of tension (c) Operating voltage setting circuit, dead zone adjusting circuit, first upper and lower limit value comparing circuit, logical operation Circuit and a variable frequency transmission circuit are connected to the counter circuit to which the up / down count data from the counter circuit is input, and a compensating circuit section including a second upper / lower limit value comparing circuit (d) From the tension detecting section A signal whose output is passed through the first variable resistor and a signal whose output from the compensation circuit section is passed through the second variable resistor are used as basic voltage signals from the variable voltage generator. (E) A motor servo driver circuit for controlling the rotational speed of any one of the motors according to the output signal from the superposing circuit section so as to adjust the tension applied to the long material to a constant value. e) A tension control device for a long material winding machine having a configuration.