JPH05310353A - Rewinder control device - Google Patents

Abstract

PURPOSE:To reliably prevent production of a fluctuation in a tension owing to a paper roll during acceleration deceleration through a simple work. CONSTITUTION:Trial operation is effected before normal operation and a paper sheet material is wound by a proper length at acceleration deceleration alphao. In which case, a deviation T is produced between a tension set value and a tension detection value Tf and a tension correction amount computing circuit 10 computes a tension correction amount Ih (=Ipo). A paper roll tension fluctuation content computing circuit 11 stores the values of a current tension correction amount Ipo and acceleration deceleration alphao. When normal operation is entered and acceleration deceleration are effected, the circuit 11 computes a tension fluctuation content Ip produced owing to the inertia moment of a paper roll according to a formula of Ip=Ipo.(alpha/alphao). A current reference computing circuit 12 on the unwinder side computes a current reference I taking the tension fluctuation content Ip into consideration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewinder device for winding a sheet material into a coil, and more particularly to a rewinder having a paper roll which is an undriven free roll between a winder and an unwinder. The present invention relates to a control device.

[0002]

2. Description of the Related Art FIG. 2 is a schematic configuration diagram of a papermaking rewinder device. As shown in the figure, the sheet material 15 is unwound from the winding coil of the unwinder roll 24 driven by the electric motor 25, passes through the paper roll 22 which is also a free roll like the free roll 21, and is driven by the electric motor 19. The winding coil 1 is conveyed in the direction of the arrow by the roll 17 and the roll 18 driven by the electric motor 20.
Take up to 6. In addition, 23 is for detecting the tension of the sheet material 15, and is attached below the free roll 21 (hereinafter, this is referred to as a tension detector).

In such a structure, the rewinder device pulls out the sheet material 15 from the unwinding coil wound around the unwinder roll 24, and winds up the sheet material having a predetermined length required for the product on the winding coil 16. Go in.
At that time, in order to improve the winding appearance of the winding coil 16, the sheet material 1 is driven by the electric motor 25 that drives the unwinder 24.
A constant tension is applied to 5.

[0004]

The control for keeping the tension constant should be performed not only when the speed is constant, but also when the speed is increasing and decreasing, that is, during acceleration / deceleration. However, during this acceleration / deceleration, when the inertia moment GD ² of the free roll 22 rotated by the sheet material 15 is large, the free roll 22 restricts the flow of the sheet material, and the tension varies greatly. become. Since the free roll 21 is usually made of a very light material, it has almost no effect on the sheet material.

Therefore, conventionally, an operator adjusts the tension setter 4 while watching the tension meter attached to the operation desk to perform an operation for keeping the tension of the sheet material 15 constant. However, such a conventional apparatus requires skill in operation and the operator must stick to the operation desk, resulting in a loss of work efficiency. Further, when the operation amount is adjusted incorrectly, a winding wrinkle is generated on the take-up roll 16, resulting in deterioration of product quality.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a rewinder device capable of reliably preventing a tension fluctuation caused by a paper roll during acceleration / deceleration by a simple operation. It is a thing.

[0007]

As a means for solving the above problems, the present invention provides a speed reference calculation circuit for calculating a speed reference based on an input of an acceleration / deceleration time setting signal and a winding speed setting signal, and the speed. The winder control circuit that controls the winder roll drive motor based on the speed reference signal from the reference calculation circuit, and the tension required between the winder roll side and the unwinder roll side during operation of the winder roll drive motor. An unwinder side current reference calculation circuit for calculating a current reference for securing and an unwinder control circuit for controlling the unwinder roll drive motor based on the current reference signal from the unwinder side current reference calculation circuit are provided. The sheet material unwound from the winder roll is passed through a paper roll with a large moment of inertia, In the rewinder control device wound up on the reel, the tension correction amount calculated based on the deviation between the set value and the detected value of the tension between the winder roll and the unwinder roll is output to the unwinder side current reference calculation circuit. The value of the tension correction amount obtained from the tension correction amount calculation circuit and the acceleration / deceleration value obtained from the speed reference calculation circuit at the time of the calculation circuit and the trial operation performed without mounting the sheet material A paper which is stored in advance and calculates a tension fluctuation amount due to the moment of inertia of the paper roll during acceleration / deceleration based on these stored values and the acceleration / deceleration input from the speed reference calculation circuit during normal operation. A roll tension fluctuation calculation circuit, and the unwinder side current reference calculation circuit is calculated by this paper roll tension fluctuation calculation circuit. Based on the tension variation, it is characterized in that performs a correction of the current reference signal to be outputted to the unwinder control circuit.

[0008]

In the above structure, first, a simple test operation is performed prior to the normal operation. That is, for example, if the sheet material is wound up by an appropriate length while being accelerated or decelerated, a deviation occurs between the set value of the tension and the detector due to the influence of the moment of inertia of the paper roll, and the tension correction is performed. The amount calculation circuit outputs the tension correction amount.

The paper roll tension fluctuation calculation circuit stores the value of the tension correction amount at this time, and further stores the acceleration or deceleration value obtained from the speed reference calculation circuit.

When accelerating or decelerating during normal operation, the paper roll tension fluctuation calculation circuit
Based on these stored values and the acceleration or deceleration input from the speed reference calculation circuit, the tension fluctuation caused by the moment of inertia of the paper roll is calculated. That is,
Since the tension correction amount and the acceleration or deceleration are in a proportional relationship, if the stored tension correction amount is multiplied by the ratio of the stored acceleration / deceleration to the input acceleration / deceleration, the amount of tension fluctuation to be obtained is calculated. Obtainable.

The unwinder side current reference calculation circuit adds the tension variation to the current reference signal to be output to the unwinder control circuit in the case of acceleration to accelerate the unwinder roll, while in the case of deceleration. If this is the case, the unwinder roll is decelerated by subtracting this tension fluctuation.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the operation command generated by the operator pressing the operation switch 1, the acceleration / deceleration time t from the acceleration / deceleration time setting device 2, and the winding speed Vs from the winding speed setting device 3 are shown. , To the speed reference calculation circuit 7.
The speed reference V from the speed reference calculation circuit 7 is determined by the motor 19,
It is given to the winder control circuit 13 for controlling 20. Further, the acceleration / deceleration α from the same speed reference calculator 7 is given to the unwinder acceleration / deceleration compensation amount calculation circuit 9 and the paper roll tension variation calculation circuit 11. Further, the unwinder acceleration / deceleration compensation amount calculation circuit 9 is also supplied with the unwinder diameter from the unwinder diameter detector 6, that is, the diameter D of the winding coil wound around the unwinder roll 24.

On the other hand, the set tension T from the tension setter 4 is
It is given to the tension deviation detection circuit 8 and the unwinder side current reference calculation circuit 12. The actual tension (detection value) Tf from the tension detector 5 is input to the tension deviation detection circuit 8, and the deviation ΔT from the set tension T is given to the tension correction amount calculation circuit 10. The tension correction amount Ih from the tension correction amount calculation circuit 10 is
It is given to the unwinder side current reference calculation circuit 12 and the paper roll tension fluctuation calculation circuit 11. In addition to this, the unwinder side current reference calculation circuit 12 also supplies the unwinder acceleration / deceleration compensation amount I from the unwinder acceleration / deceleration compensation amount calculation circuit 9.
a and the paper roll acceleration / deceleration current reference Ip from the paper roll tension variation calculation circuit 11, and the unwinder current reference I as its output is given to the unwinder control circuit 14.

Next, the operation of the present embodiment configured as described above will be described. First, in the speed reference calculation circuit 7,
The acceleration / deceleration α is calculated from the maximum speed Vmax determined for each rewinder device (this is given to the speed reference calculator 7 as a constant) and the acceleration / deceleration time t from the acceleration / deceleration time setting device 2. That is, α = Vmax / t.

Then, this α is integrated when the operation switch 1 is turned ON, and the winding speed Vs from the winding speed setting device 3 is integrated.
When the value reaches, the integration is stopped. The pattern of the winding speed V is as shown in FIG. This speed reference V is given to the winder control circuit 13. As a result, roll 1 of FIG.
The electric motor 19 that drives 7 and the electric motor 20 that drives the roll 18 are driven, and the take-up roll 16 is finally rotated at the speed reference V. The acceleration / deceleration time t and the winding speed Vs are changed each time depending on the type of sheet material.

On the other hand, in the electric motor 25 for driving the unwinder roll 24 shown in FIG. 2, the sheet material 15 is wound onto the winding roll 16 rotating at the winding speed Vs.
The electric current is required to rotate in the direction of the arrow in order to send it toward However, if the speed is constant, the current for rotation is unnecessary (actually, there is mechanical loss, but it is not included because it is a small amount), so the actual current is required because the speed changes. When, that is, during acceleration / deceleration. The current at this time is calculated by the unwinder acceleration / deceleration compensation amount calculation circuit 9, and the output of the acceleration / deceleration compensation amount Ia can be obtained by the following equation (this equation is a well-known general equation). it can.

[0018] That is, ^{Ia = K · (GD 2 /} 120g) · (1 / D) · α (1). Here, K is a constant determined by the capacity of the electric motor 25, GD ² is the moment of inertia at the maximum diameter of the unwinder-side unwinding coil, g is gravitational acceleration, and D is the current diameter of the unwinder-side unwinding coil.

However, in order to wind the sheet material 15 on the roll 15 as a product having a good winding shape, it is necessary to apply tension to the sheet material 15 in the direction opposite to the feeding direction of the sheet material 15. At this time, the current value It required for the tension can be expressed as It = K · (T / 2) (2), where T is the set tension.

Therefore, the unwinder current reference I given to the unwinder control circuit 14 of FIG. 1 is Ia and I
The difference from t, that is, I = Ia−It (3).

By the way, if the paper roll 22 does not restrain the flow of the sheet material 15,
There is no problem even if the current reference I is calculated only by the difference between Ia and It. However, in reality, since the paper rolls 22 are restrained, the following decrease occurs.

That is, during acceleration, the paper roll 22
The flow of the sheet material 15 is delayed and the tension between the rolls 21 and 22 increases in order to accelerate. On the other hand, during deceleration, while the flow of the sheet material 15 is decelerated, the paper roll 22 tends to send out the sheet material 15, and the tension between the rolls 21 and 22 decreases.

Therefore, before the normal operation, a trial operation is performed such that the sheet material 15 is wound by an appropriate length. Then, the fluctuation of the tension at this time is measured as the actual tension Tf by the tension detector 23 for a certain specific acceleration / deceleration αo, and the deviation ΔT from the set tension T is detected. Then
The value is ΔTo, and the value obtained by multiplying it by the machine coefficient is
The tension correction amount I calculated as the electric power value in the same manner as the equation (2)
The value obtained by adding Ih to the right side of the equation (3) is output as the unwinder current reference I.

At this time, the mechanical coefficient is adjusted so that ΔT becomes zero, and the tension correction amount Ih at that time is used as the paper roll acceleration / deceleration current Ipo at the acceleration / deceleration αo in the paper roll tension variation calculation circuit 11. Stored in memory. The mechanical coefficient here is determined by actual measurement and is difficult to calculate because it varies depending on the angle of the sheet material wrapped by the rolls 21 and 22 and the distance between the rolls.

Generally, since the electric power value required to rotate the roll is proportional to the acceleration / deceleration α, the degree to which the sheet material 15 is restrained by the roll 22 during the acceleration / deceleration is also proportional to the acceleration / deceleration α. Therefore, in the sheet material 15, the tension deviation ΔT generated between the rolls 21 and 22 is considered to be proportional to the acceleration / deceleration α.

Therefore, the paper roll acceleration / deceleration current Ipo as the previously obtained tension correction amount is set to the acceleration / deceleration α at that time.
The value Ip converted by the ratio of αo to αo can be obtained by the following equation (4) as the paper roll acceleration / deceleration current, that is, the amount of tension fluctuation generated by the paper roll during acceleration / deceleration.

Ip = Ipo · (α / αo) (4) That is, based on Ipo and αo obtained during the trial run,
During normal operation, paper roll tension fluctuation calculation circuit 1
1, the tension fluctuation component Ip can be obtained by the equation (4).

Then, the unwinder side current reference calculation circuit 12 adds this Ip to the equation (3),
The unwinder current reference I is calculated by the equation (5) for acceleration and by the equation (6) for deceleration.

I = Ia-It + Ip (5) I = Ia-It-Ip (6) The unwinder control circuit 14 controls the electric motor 25 based on the unwinder current reference I thus obtained. Therefore, during acceleration or deceleration, the occurrence of tension fluctuation due to the paper roll 22 having a large moment of inertia can be effectively prevented by performing a simple test operation.

[0030]

As described above, according to the present invention, the test operation is performed in advance to store the tension correction amount at the time of acceleration / deceleration and the acceleration / deceleration at that time, and the stored value is used. Therefore, the tension fluctuation caused by the paper roll can be obtained during normal operation, so the tension fluctuation that would occur due to the moment of inertia of the paper roll during the normal operation acceleration / deceleration can be effectively performed by a simple operation. Can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing the configurations of drive systems of an apparatus according to an embodiment of the present invention and a conventional apparatus.

FIG. 3 is a characteristic diagram for explaining the operation of FIG.

[Explanation of symbols]

 t Acceleration / deceleration time setting signal Vs Winding speed setting signal V Speed reference 7 Speed reference calculation circuit 19,20 Winder roll drive motor I Current reference 12 Unwinder side current reference calculation circuit 25 Unwinder roll drive motor 14 Unwinder control circuit 15 Sheet material 16 winder roll 24 unwinder roll Ih tension correction amount 10 tension correction amount calculation circuit α acceleration / deceleration Ip tension fluctuation amount 11 paper roll tension fluctuation amount calculation circuit

Claims (1)

[Claims] 1. A speed reference calculation circuit for calculating a speed reference based on an input of an acceleration / deceleration time setting signal and a winding speed setting signal, and control of a winder roll drive motor based on the speed reference signal from the speed reference calculation circuit. A winder control circuit for performing, an unwinder side current reference calculation circuit for calculating a current reference for securing a tension required between the winder roll side and the unwinder roll side during operation of the winder roll drive motor, An unwinder control circuit that controls the unwinder roll drive motor based on the current reference signal from the unwinder side current reference calculation circuit, and a sheet material that is unwound from the unwinder roll, and a paper roll with a large moment of inertia. In the rewinder control device for winding the winder roll through the winder roll, A tension correction amount calculation circuit that outputs a tension correction amount calculated based on the deviation between the set value and the detected value of the tension between the unwinder rolls to the current reference calculation circuit on the unwinder side; The value of the tension correction amount obtained from the tension correction amount calculation circuit when wound over, and the acceleration / deceleration value obtained from the speed reference calculation circuit at that time are stored in advance, and during normal operation, A paper roll tension fluctuation calculation circuit for calculating a tension fluctuation caused by the moment of inertia of the paper roll at the time of acceleration / deceleration, based on these stored values and the acceleration / deceleration input from the speed reference calculation circuit. The unwinder side current reference calculation circuit is based on the tension fluctuation calculated by the paper roll tension fluctuation calculation circuit. Rewinder control apparatus, characterized in that to correct the current reference signal to be output to the circuit.