JPH03102059A - Control device for no tension rewinding line - Google Patents

Abstract

PURPOSE:To prevent application of tension on lengthy material by providing a second feed roll between a rewinder and a loop, searching the outer diameter of a coil from the detected values of line speed and rewinder speed, and instituting the value of the coil outer diameter multiplied by the rewinder speed command value as a speed command value of the second feed roll. CONSTITUTION:The outer diameter of a roll changing by moment is computed by divide computing the running speed of a lengthy material detected with a first feed roll 20 by the rotating speed of a rewinder 10, and the result of the speed command value to the rewinder 10 multiplied by the outer diameter of the roll is instituted as the speed command value for a second feed roll 30. By the command value, the speed of the lengthy material moved with the second feed roll 30 is conformed to the delivery speed of the lengthy material from the rewinder 10, the coil is not loosened, tension is not applied on the lengthy material, and the lengthy material (metallic foil) is smoothly drawn out from the rewinder.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a control device for a tension-free unwinding line that can pull out a long material wound into a coil without applying tension. [Prior Art] When performing surface treatment or slitting on a long material wound into a coil, the coil is attached to an unwinder and the long material is pulled out. If the length is made of copper or aluminum foil, for example, if tension is applied to the metal foil when it is pulled out from the unwinding machine, it may wrinkle or break. Therefore, when pulling out long materials that cannot be tensioned, such as metal foil, it is necessary to devise ways to unwind them without tension. FIG. 2 is a circuit diagram showing a conventional example of control of a tensionless rewinding line configured to unwind a long material without tension.

In FIG. 2, a coil wound with metal foil 2 as a long material is attached to an unwinding machine 1o, and by rotating the unwinding machine 10 with the unwinding machine motor 11, the metal foil 2 is moved in the direction of the arrow. It travels to the right, passes through the loop 3 and the first feed roll 20, and is transferred to the next process, for example, a surface treatment line. It features a tension unwinding line.

Since the line speed setting device 7 sets the traveling speed of the metal foil 2, the first feed roll speed command value 0 corresponding to this line speed setting value and the l-th feed fed back from the speed transmitter 22 When the deviation from the roll speed detection value V is calculated and given to the control device 23, the control device 23 controls the motor 21 to make this input deviation zero, and moves the metal foil 2 at the set speed. Let it run. As the gold R foil 2 is drawn out, the outer diameter of the coil gradually decreases, but since the line speed remains constant, the unwinder 10 increases its speed in response to the decrease in the outer diameter of the coil. There is a need. By the way, even if there is a slight difference between the running speed of the metal foil 2 fed out from the unwinding machine 10 and the running speed of the metal foil 2 transferred by the first feed roll 20, tension will not be applied to the metal foil 2. This may result in defective products. Therefore, the unwinding machine 10 and the first feed roll 20
A lube 3 is provided between the two and the metal foil 2 is stored there, and by absorbing the speed difference mentioned above, unwinding without tension can be realized. The lube 3 is provided with a loop amount detector 4, and the lube 3 is
If the loop amount of the metal foil 2 stored in the loop amount is larger than the value set by the loop amount setting device 5, a deceleration command is issued, and if the loop amount is less than the set value, a speed increase command is issued.
outputs. Therefore, the output of this loop amount regulator 6,
The set value vI of the line speed setter 7 mentioned above is added to the adder 8
, and the addition result is set as the speed command value N0 of the motor 11 for the rewinding machine IO. When the deviation between the speed detection value N fed back from the speed transmitter 12 and this speed command value N0 is input to the control device I3, the control device 13 controls the motor 11 to make the input deviation zero. Since the rotational speed of the rewinding machine 10 is adjusted so that the loop amount stored in the lube 3 always maintains the set value, it is possible to realize control corresponding to the decrease in the coil outer diameter as described above. can. That is, since the metal foil 2 fed out from the unwinding machine 10 always passes through the first feed roll 20 via the lube 3 in which a predetermined amount of loops is stored, it is unwinded without tension. [Problems to be Solved by the Invention] By the way, even if an attempt is made to feed out the gold foil 2 by rotating the unwinding machine 1O, it is often difficult to feed out the metal foil 2 smoothly. This is because the material wound into a coil has a tendency to loosen and expand, so even if the unwinding 4I10 is rotated in the unwinding direction, the coil will only loosen, and the force that pulls out the metal foil 2 will only loosen the coil. This is only due to the weight of the gold lIliw12 itself stored in the lube 3, but in the case of a thin and light material like the metal foil 2, it is hardly expected that it will be fed out by its own weight. So I had no choice but to rewind 8110
A second feed roll is provided on the exit side of the metal foil 2 to draw out the metal foil 2, but as mentioned above, it is difficult to pull it out without applying tension. Therefore, an object of the present invention is to enable a long material wound into a coil to be smoothly pulled out from an unwinding machine without applying tension.

[Means to solve the problem]

In order to achieve the above purpose, the control device of this invention has the following features:
An unwinder for mounting a long material wound into a coil, a first feed roll for running the long material pulled out from the unwinder at a constant line speed, and the unwinder and the first feed roll. In order to maintain the loop of the long material provided between the loops and the loop amount stored in this loop at a predetermined value, the unwinding machine speed command value obtained from the loop adjustment means is given to the unwinding machine to adjust its speed. A second feed roll is provided between the unwinder and the loop in the tensionless unwinding line being controlled, and a divider that divides the line speed of the long material by the rotational speed of the unwinder; A multiplier is provided to multiply the result of this division operation by the speed command value of the rewinding machine, and the result of this multiplication operation is used as the speed command value of the second feed roll. [Function] This invention provides a second feed roll between the unwinder and the loop in a rewinding line that consists of an unwinder, a loop, and a first feed roll. By appropriately controlling the speed of the second feed roll, the long material fed out from the unwinder is transferred to the loop without tension. In other words, by dividing the traveling speed of the long material detected by the first feed roll by the rotation speed of the unwinder, the outer diameter of the roll, which is changing from time to time, is calculated, and the speed given to the unwinder is calculated. By multiplying the command value by the outside diameter of this roll and setting it as the speed command value for the second feed roll, the speed of the long material transferred by this second feed roll can be adjusted to the speed of the long material fed out from the unwinding machine. By matching the unwinding speed, the long material can be smoothly pulled out from the unwinding machine without the coil loosening or applying tension to the long material. (Embodiment) Fig. 1 is a circuit diagram showing an embodiment of the present invention. In Fig. 1, a metal foil 2 as a long material is transferred from an unwinding machine IO to a second feed roll 30 and a lube 3. The material is then transferred to the right through the first feed roll 20, and among those shown in the embodiment circuit of FIG.
, loop amount detector 4, loop amount setting device 5, loop amount regulator 6, line speed setting device 7, adder 8, rewinding machine IO and motor 11 for this rewinding 11110, speed transmitter l2, control device 13, and the first feed roll 20 and this first
A motor 21 for the feed roll 20, a speed transmitter 22,
Since the control device 23 has already been described in the conventional circuit shown in FIG. 2, a description thereof will be omitted. In the present invention, a second
Even if the feed roll 30 of
The second feed roll 30 pulls out the material that cannot be pulled out due to its own weight, but at this time,
By controlling the payout speed of the metal foil 2 from the unwinding machine 10 and the transfer speed of the second feed roll 30 to match, tension is not applied to the metal foil 2.

The circumferential speed of the coil attached to the unwinding machine IO must be equal to the line speed of the metal foil 2 transferred by the first feed roll 20. Therefore, the line speed is
If the rotation speed at 0 is N, the coil outer diameter D is as follows (+)
It can be found using the formula. ■ D = 111−−−・・−−
--1(1)π ・N Then, the speed transmitter 2 coupled to the first feed roll 20
The line speed ■ is detected from 2, the rotational speed N is detected from the speed transmitter 12 connected to the rewinding machine IO, and the detected V and N are given to the divider 34 to calculate the equation (1). By doing this, the coil outer diameter D can be obtained from this divider 34. As mentioned above, the speed command value N0 of the rewinding machine 10 is the line speed command value v0 set by the line speed setting device 7 and the loop amount till! Since it is the sum of the output of the li device 6, the relationship between the speed command value N0 of the rewinding 8110 outputted by the adder 8 and the speed command value N1 given to the second feed roll 30 is expressed by the following equation (2). It can be found. N,”-D-N”・One------
---------1...- (2) That is, this equation (2) is nothing but the inverse calculation of equation (1) for calculating the outer diameter D of the coil. Therefore, the rewinding machine 1 outputted from the adder 8
By leading the speed command value N0 of 0 and the coil outer diameter D output from the divider 34 to the multiplier 35 and multiplying them, the calculation of equation (2), that is, the speed command of the second feed roll 30 is obtained. The value NF* can be obtained. Since the speed transmitter 32 connected to the motor 3I that drives the second feed roll 30 detects a speed detection value N corresponding to the traveling speed of the metal foil 2 being transferred by the second feed roll 30, The control device 33 uses this speed detection value N,
is controlled to match the speed command value N1 obtained as described above. In this way, speed command values that match the circumferential speed of the unwinding machine 10 and the line speed of the second feed roll 30 are respectively given. Such calculations and controls also cause a slight error, but this can be eliminated by providing the second feed roll 30 with a so-called drooping characteristic, in which the speed decreases as the load increases. [Effects of the Invention] According to the present invention, in an unwinding line that is composed of an unwinding machine, a loop, and a feed roll, a second feed roll is provided between the unwinding machine and the loop, and the detected line speed value is The outer diameter of the coil is determined from the detected value of the unwinding machine speed, and the value obtained by multiplying this coil outer diameter by the unwinding machine speed command value is used as the speed command value of the newly installed second feed roll. Since the long material can be pulled out at a line speed that matches the circumferential speed of the coil, smooth operation can be achieved without applying tension to the long material.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, and Fig. 2 is a circuit diagram showing a conventional example of control of a tension-free rewinding line that is configured to rewind a long material without tension. It is. 2... Metal foil as a long material, 3... Loop, 4...
...Loop amount detector, 5...Loop amount setter, 6...
・Loop amount adjuster, 7...Line speed setting device, 8...
-Adder, 10...Rewinder, 11. 21. 31・
...Motor, 12. 22. 32...speed detector,
13, 23. 33...control device, 20...first
Feed roll, 30...Second feed roll, 34
...Divider, 35...Multiplier. z 2 Figure 7 Figure 1

Claims (1)

[Claims] 1) An unwinder that attaches a long material wound into a coil, a first feed roll that runs the long material pulled out from this unwinder at a constant line speed, and these unwinders and the first feed. In order to maintain the loop of the long material provided between the roll and the loop amount stored in this loop at a predetermined value, the unwinding machine speed command value obtained from the loop adjustment means is given to the unwinding machine. In a tensionless unwinding line whose speed is controlled, a second feed roll is provided between the unwinding machine and the loop, and the line speed of the long material is divided by the rotational speed of the unwinding machine. and a multiplier for multiplying the division result by the unwinding machine speed command value, and the tension-free rewinding line is characterized in that the multiplication result is used as the speed command value for the second feed roll. control device.