JPH11292366A - Tension-controlled winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To very easily perform delicate tension control by controlling tension of a sheet between an original textile roller of an unreeling stand and a feed roller, and controlling tension of a sheet between the feed roller and a surface roller. SOLUTION: In control of tension of a sheet 2 between an original textile roller 1 of an unreeling stand 10 and a feed roller 40, a rotating speed of the original textile roller 1 is measured by measuring a flowing quantity of the sheet 2 to perform an operation on a diameter of the original textile roller 1 at present time. Only an electric current value of a first AC servomotor 12 is controlled so that rotational torque applied to the original textile roller 1 is made to correspond to a tension value. In control of tension of a sheet 3 between the feed roller 40 and a surface roller 90, tension is controlled so that the rotation ratio of a second AC servomotor 41 to a third AC servomotor 91 becomes a specific value corresponding to a desired tension value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding machine for a sheet-like object such as paper, resin film, aluminum foil, copper foil or a laminated material obtained by laminating these materials. The present invention relates to a tension control in a winding machine suitable for use in cutting such a sheet-like object, particularly, in slitting or the like.

[0002]

2. Description of the Related Art Conventionally, for example, in a winding machine used for slitting a sheet-shaped object of this kind to a predetermined width, the sheet is rewound from a raw roll on which a wide sheet is wound. After that, the slitted sheet having a predetermined width is wound again to form a winding roll (product roll). In such a conventional slitter, on the unreel side where the material roll is rewound, a mechanical brake or a powder brake is exclusively used, a tension detecting roll is arranged between the unreel and the feed roll, and the tension between the rolls is detected. Tension control is performed. In some cases, the unreel-side winding diameter is obtained by calculation, and control without a tension detecting roll is performed.

On the other hand, the tension between the feed roll and the take-up roll (product roll) is controlled by providing a powder clutch on the drive side of the take-up roll to give an empirical slip ratio, or to control the tension between them. A method of arranging a dancer roll, defining the weight of the dancer roll, and slipping a powder clutch so that the position is constant has been taken. Of course, control using a motor instead of a powder clutch has also been performed.

[0004]

In the conventional method of controlling the tension of a sheet in a winding machine used for a processing machine such as a slitting machine, a mechanical brake, Alternatively, the method using a powder brake has disadvantages such as large mechanical loss, excessive tension, and permanent deformation of the film. Further, in the control method using the tension detecting roll, the response speed of the load cell used for the tension detecting roll is slow, so that the control is delayed, that is, the time lag becomes large, and the tension cannot be kept precisely constant. Was. If the tension of the sheet changes delicately during slitting in this way, in the case of a film with large elongation, the cut will be bad, and in the case of a film without elongation, slippage will occur. Inconvenience had occurred.

[0005] On the other hand, on the winding side, there are other problems such as winding hardness and winding shape directly related to the quality of the product in addition to the above-mentioned problems, and these are also determined by the tension. The take-up side AC servomotor must be capable of once cutting off the unreel side tension by the feed roll and rewinding the released sheet by delicate tension control.

Further, arranging a tension detecting roll, a dancer roll and the like complicates the apparatus, and in some cases, it is difficult to install the apparatus.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, simplify the apparatus configuration, and make it possible to very easily and precisely control fine tension from zero tension. It is to provide.

[0008]

According to one aspect of the present invention, there is provided an unreel stand for holding a material roll so that the material roll can be rewound, and a method for unwinding the material roll from the material roll held by the unreel stand. A take-up stand for taking up the obtained sheet onto a take-up roll, and a sheet from the material roll held between the unreel stand and the take-up stand and disposed between the unreel stand and the take-up stand. A winder provided with a feed roll for feeding toward a winding stand, a first AC provided on the unreel stand for applying a rotational torque to the raw roll.
A servomotor, a second AC servomotor for applying a rotational torque to the feed roll, and a third AC drive for applying a rotational torque to the take-up roll formed at the take-up stand. A
C servomotor, and the sheet tension between the raw roll and the feed roll of the unreel stand is controlled to a desired value by controlling only the current value of the first AC servomotor. The tension of the sheet between the feed roll and the surface roll is controlled to a desired value by controlling the speed between the second AC servomotor and the third AC servomotor. Is controlled.

According to one embodiment of the present invention, the control of only the current value of the first AC servomotor is performed by controlling the sheet flow amount determined by the rotation speed of the feed roll and the rotation speed of the raw roll. From the above, the diameter of the raw roll is calculated, and the sheet tension is obtained from the torque applied to the raw roll determined by the current value of the first AC servomotor and the calculated diameter of the raw roll, The current value of the first AC servomotor is controlled so that the current value becomes a torque value corresponding to the diameter of the material roll at which the tension becomes a desired value. The speed control between the third AC servomotor and the speed ratio between the feed roll and the surface roll is controlled so that the speed ratio between the feed roll and the surface roll corresponds to a desired value of the sheet tension. As will be carried out by digital control by the second AC servo motor, and a third voltage control or pulse train of the AC servo motor.

According to another feature of the present invention, an unreel stand for holding the material roll so that it can be rewound,
A winding stand for winding the sheet unwound from the material roll held by the unreel stand onto a winding roll; and the winding stand arranged between the unreel stand and the winding stand. And a feed roll for feeding a sheet from the material roll held by a reel stand toward the winding stand. And a second AC servomotor for applying a rotational torque to the feed roll.
A servo motor, and a third AC servo motor provided on the winding stand for applying a rotating torque to the winding roll, wherein a third AC servo motor is provided between the raw roll and the feed roll of the unreel stand. Is controlled to be a desired value by controlling only the current value of the first AC servomotor,
The tension of the sheet between the feed roll and the take-up roll is controlled by controlling the number of revolutions so that the current value of the third AC servomotor becomes a desired value.

According to one embodiment of the present invention, the control of only the current value of the first AC servomotor is performed by controlling the sheet flow rate determined by the rotation speed of the feed roll and the rotation speed of the raw roll. From the above, the diameter of the raw roll is calculated, and the sheet tension is obtained from the torque applied to the raw roll determined by the current value of the first AC servomotor and the calculated diameter of the raw roll, The current value of the first AC servomotor is controlled so that the current value of the first AC servomotor becomes a torque value corresponding to the diameter of the material roll where the tension becomes a desired value. The control of the value is performed by calculating the diameter of the winding roll from the amount of sheet flow determined by the rotation speed of the feed roll and the number of rotations of the winding roll. The tension of the sheet is determined from the torque applied to the winding roll determined by the current value of the AC servomotor and the calculated diameter of the winding roll, and the current value of the third AC servomotor is set to a desired value. The control is such that the current value becomes a torque corresponding to the diameter of the take-up roll.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in more detail with reference to the accompanying drawings according to embodiments of the present invention.

FIG. 1 schematically shows the entire configuration of a winder applied to a slitter as one embodiment of the present invention.
The winding machine mainly includes an unreel stand 10 for holding the material roll 1 on which a sheet-like object to be slit is wound so as to be able to rewind, and a slitter 60 for slitting the sheet-like object. And the sheet 2 from the material roll 1 held between the unreel stand 10 and the slitter 60 and disposed between the unreel stand 10 and the slitter 60.
Including a feed roll 40 for feeding the sheet 3 toward the slitter 60 and a surface roll 90 constituting winding means for turning the sheet 3 slitted by the slitter 60 into a winding roll (product roll) 4. And a taking stand 100.

The unreel stand 10 is a material roll 1
And a shaft 11 that can rotate together with the material roll 1 is attached. The shaft 11 is associated with a first AC servomotor 12 for rotating the shaft 11 to apply a rotational torque to the material roll 1. Further, the feed roll 40 is associated with a second AC servomotor 41 for applying a rotational torque to the feed roll 40. Furthermore, the surface roll 90 includes the surface roll 40.
AC servo motor 9 for applying rotational torque to the motor
1 is associated.

Here, the characteristics of the AC servomotor which plays an important role in the present invention will be described in detail. AC
The servomotor has a characteristic that its generated torque is proportional to the current value, and its rotation speed is determined only by the voltage. Some AC servomotors have their rotation speed digitally controlled by a pulse train. And there is no correlation between the torque and the rotation speed.
Therefore, in the present invention, a vector inverter motor, a DC servo motor, or the like having the above-described characteristics may be used. For this reason, the term “AC servomotor” used in this specification has a broad meaning including such a DC servomotor and the like. The AC servomotor used in the present invention may be any commercially available one.
A digital AC servomotor or BS servomotor sold as BS Servo series and F series may be used.

Next, the overall operation and tension control of such a winder will be described. The sheet 2 to be slitted from the raw roll mounted on the shaft 11 of the unreel stand 10 is pulled out by the feed roll 40 through the conversion rolls 20 and 30, and
It is sent to a slitter 60 via a feed roll 40 and further via a conversion roll 50.

The sheet 3 slitted to a predetermined width by the slitter 60 is sent to a surface roll 90 via a conversion roll 70 and an expansion roll 80. The slitted sheet 3
Further, it is wound around a winding shaft 101 of a winding stand 100 to form a winding roll 4. At this time, the take-up roll 4 is pressed against the surface roll 90 with a contact pressure that does not cause slippage between the take-up roll 4 and the surface roll 90 due to the tension applied to the sheet 3.

The overall operation of the tension control performed by the present invention in the flow of the operation of the winding machine will be described below. First, the control of the tension of the sheet 2 between the material roll 1 of the unreel stand 10 and the feed roll (also known as tension cut roll) 40 will be described. The flow amount of the sheet 2 is measured from the rotation of the feed roll 40 and the like. Further, the number of rotations of the material roll 1 is measured, and the diameter of the material roll 1 at the present time is calculated and obtained from time to time. Except during the initial stage of the rotation of the web roll, the first AC servomotor 12 normally associated with the shaft 11 of the take-up stand 10 normally acts as a brake, By detecting the current value of the servo motor 12 from time to time, it is possible to know the rotational torque applied to the material roll 1. As described above, the tension applied to the sheet 2 can be determined from time to time from the diameter of the material roll 1 and the rotational torque applied to the material roll obtained by the calculation. Therefore,
Only the current value of the first AC servomotor 12 is controlled so that the tension becomes a desired value, so that the rotation torque applied to the material roll 1 becomes a rotation torque corresponding to the desired tension value. can do.

Next, control of the tension of the sheet 3 between the feed roll 40 and the surface roll 90 will be described.
The tension control is performed by draw control (speed control or speed difference control) such that the rotation ratio with the AC servo motor 91 becomes a constant value corresponding to a desired tension value. That is, the rotation of each roll is controlled by voltage control or digital control using a pulse train of the second AC servomotor 41 that drives the feed roll 40 and the third AC servomotor 91 that drives the surface roll 90. May be either the feed roll 40 or the surface roll 90. Anyway, it is only necessary to always drive at a constant speed ratio. The relationship between the draw control and the tension value can be easily obtained from the current value of the third AC servomotor that is the drive motor of the surface roll 90, that is, the torque and the diameter of the surface roll 90.

As the feed roll 40, a high friction roll such as a tungsten carbide or molybdenum sprayed roll or a ceramic roll is preferably used, and it is preferable to arrange the feed angle as large as possible. There is also a method of disposing a nip roll and nipping a sheet by a feed roll and a nip roll (not shown). As for the surface roll 40, it is generally preferable to use a high-friction roll or a rubber roll depending on the material of the sheet to be slitted, as described above. Further, in order to prevent mechanical loss of a small roll such as a conversion roll used in the middle, each roll may be driven by a belt or the like.

Furthermore, the first AC servomotor 12 for driving the material roll 1 in the unreel stand 10 generally acts as a regenerative brake as described above, and saves energy by generating power. If the material roll needs to be greatly energized in the initial stage, it may act as a rotating motor on the contrary, and the switching can be performed automatically and smoothly.

FIG. 2 schematically shows the entire configuration of a winder applied to a slitter as another embodiment of the present invention. The winding machine mainly includes an unreel stand 10 for holding the material roll 1 on which a sheet-like object to be slit is wound so as to be able to rewind, and a slitter 60 for slitting the sheet-like object. A feed roll 40 disposed between the unreel stand 10 and the slitter 60 to feed the sheet 2 from the raw roll 1 held by the unreel stand 10 toward the slitter 60; And a take-up stand 100A having a shaft 101A, which forms a take-up roll (product roll) 4 using the sheet 3 slitted by the above-mentioned method by a shaft winding method.

The unreel stand 10 is a material roll 1
And a shaft 11 that can rotate together with the material roll 1 is attached. The shaft 11 is associated with a first AC servomotor 12 for rotating the shaft 11 to apply a rotational torque to the material roll 1. Further, the feed roll 40 is associated with a second AC servomotor 41 for applying a rotational torque to the feed roll 40. Furthermore, a third AC servomotor 102 for rotating the shaft 101A to apply a rotational torque to the winding roll 4 is associated with the shaft 101A of the winding stand 100A.

Next, the overall operation and tension control of such a winder will be described. The sheet 2 to be slitted from the raw roll mounted on the shaft 11 of the unreel stand 10 is pulled out by the feed roll 40 through the conversion rolls 20 and 30, and
It is sent to a slitter 60 via a feed roll 40 and further via a conversion roll 50.

The sheet 3 slitted to a predetermined width by the slitter 60 passes through a conversion roll 70, an expansion roll 80, and a conversion roll 85,
It is wound around the shaft 101A of the winding stand 100A, and the winding roll 4 is formed. At this time, the pressure roll 103 is pressed against the winding roll 4 with such a contact pressure that no slip occurs between the winding roll 4 and the sheet 3 due to the tension applied to the sheet 3.

The overall operation of the tension control performed by the present invention in the flow of the operation of the winding machine will be described below. First, regarding the control of the tension of the sheet 2 between the material roll 1 of the unreel stand 10 and the feed roll 40, the material roll 1 and the feed roll 40 of the unreel stand 10 in the winding machine described above with reference to FIG. Since the control of the tension of the sheet 2 is the same as that of the above, the description will not be repeated here.

Next, the feed roll 40 and the take-up roll 4
The following describes the control of the tension of the sheet 3 between the feed roll 40 and the feed roll 40 by the same principle as the method of controlling the tension of the sheet 2 between the raw roll 1 and the feed roll 40 of the unreel stand 10. The flow amount of the sheet 3 is measured from rotation or the like, and the number of rotations of the winding roll 4 is measured, and the diameter of the winding roll 4 at the present time is calculated and obtained every moment. By detecting the current value of the third AC servomotor 102 from time to time, the rotational torque applied to the winding roll 4 can be known. As described above, the tension applied to the sheet 3 can be obtained every moment from the diameter of the take-up roll 4 and the rotational torque applied to the take-up roll, which are calculated every moment. Therefore, by controlling the current value to be a desired value by increasing or decreasing the rotation speed of the third AC servomotor 102 so that the tension becomes a desired value, the rotational torque applied to the winding roll 4 is adjusted to the desired value. The rotation torque can be set to correspond to the tension value.

[0028]

As described above, a tension detecting roll is not required, and the control time lag can be reduced to almost zero.

According to the digital control using the pulse train, 1
A speed accuracy of / 10,000 or more is possible, and it is easy to wind up a sheet with little elongation such as a metal foil.

Conversely, for a film or the like which is extremely easily stretched, the time lag of control is almost zero, so that the cut is extremely good without being affected by a change in the winding speed or the like.

Since the current between the unreel and the feed roll can be controlled only by the current value of the AC servomotor, and the distance between the feed roll and the surface roll can be controlled only by the voltage ratio (including the ratio of the pulse train), the speed is extremely simple. Control.

Therefore, the configuration of the entire winding system can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a winder applied to a slitter as one embodiment of the present invention.

FIG. 2 is a schematic diagram showing an entire configuration of a winder applied to a slitter as another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 raw roll 2 rewinded sheet 3 slitted sheet 4 take-up roll 10 unreel stand 11 shaft 12 first AC servomotor 20 conversion roll 30 conversion roll 40 feed roll 41 second AC servomotor 50 Conversion roll 60 Slitter 70 Conversion roll 80 Expansion roll 85 Conversion roll 90 Surface roll 91 Third AC servomotor 100 Take-up stand 100A Take-up stand 101 Shaft 101A Shaft 102 Third AC servomotor 103 Pressure roll

Claims (4)

[Claims] An unreel stand for holding a material roll so as to be able to be rewound, and a winding for winding a sheet unwound from the material roll held by the unreel stand to a take-up roll. A take-up stand, and a feed roll that is disposed between the unreel stand and the take-up stand and feeds a sheet from the material roll held by the unreel stand toward the take-up stand. A first AC servomotor provided on the unreel stand for applying a rotational torque to the material roll; and a second AC servomotor for applying a rotational torque to the feed roll. And a third AC servo motor for driving a surface roll for applying a rotational torque to the winding roll formed in the winding stand. The tension of the sheet between the material roll and the feed roll of the unreel stand becomes a desired value by controlling only the current value of the first AC servomotor. And the sheet tension between the feed roll and the surface roll becomes a desired value by controlling the speed between the second AC servomotor and the third AC servomotor. The winding machine is controlled as follows. 2. The control of only the current value of the first AC servomotor calculates the diameter of the raw roll from the flow rate of the sheet determined by the rotation speed of the feed roll and the rotation speed of the raw roll. A sheet tension is determined from a torque applied to the material roll determined by a current value of the first AC servomotor and the calculated diameter of the material roll, and a current value of the first AC servomotor is calculated. Is controlled so that the current value becomes a torque corresponding to the diameter of the material roll at which the tension becomes a desired value, and the current value between the second AC servomotor and the third AC servomotor is controlled. Speed control, so that the speed ratio between the feed roll and the surface roll is a constant value corresponding to the desired value of the sheet tension,
The winder according to claim 1, wherein the winding is performed by voltage control or digital control by a pulse train of the second AC servomotor and the third AC servomotor. 3. An unreel stand for holding a material roll so that the material roll can be rewound, and a winding device for winding a sheet unwound from the material roll held by the unreel stand onto a take-up roll. A take-up stand, and a feed roll that is disposed between the unreel stand and the take-up stand and feeds a sheet from the material roll held by the unreel stand toward the take-up stand. A first AC servomotor provided on the unreel stand for applying a rotational torque to the material roll; and a second AC servomotor for applying a rotational torque to the feed roll. And a third AC servomotor provided on the winding stand for applying a rotating torque to the winding roll,
The tension of the sheet between the material roll and the feed roll of the unreel stand is controlled to a desired value by controlling only the current value of the first AC servomotor. The tension of the sheet between the winding roll and the winding roll is controlled by controlling the number of revolutions so that the current value of the third AC servomotor becomes a desired value. 4. The control of only the current value of the first AC servomotor calculates a diameter of the raw roll from a flow rate of a sheet determined by a rotation speed of the feed roll and a rotation speed of the raw roll. A sheet tension is determined from a torque applied to the material roll determined by a current value of the first AC servomotor and the calculated diameter of the material roll, and a current value of the first AC servomotor is calculated. Is controlled so that the current value becomes a torque corresponding to the diameter of the material roll at which the tension becomes a desired value. The current value of the third AC servomotor is controlled by rotating the feed roll. The diameter of the take-up roll is calculated from the amount of sheet flow determined by the speed and the number of rotations of the take-up roll, and the current value of the third AC servomotor is used to calculate the diameter. The sheet tension is determined from the determined torque applied to the winding roll and the calculated diameter of the winding roll, and the current value of the third AC servomotor is changed to the winding roll at which the tension becomes a desired value. 4. The winder according to claim 3, wherein the control is such that the current value becomes a torque corresponding to the diameter of the winder.