JP2013184749A - System and device of driving/controlling thin film sheet, and sheet winding device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and device capable of stably handling and winding a sheet of very low rigidity such as an ultrathin plastic sheet in a wrinkle-free manner.SOLUTION: A device of driving/controlling a thin sheet including rotary driving means each capable of independently controlling a plurality of conveyance rollers 8, 12 for transferring a sheet and the rotation angles of the plurality of conveyance rollers 8, 12, respectively, a plurality of rotation amount control means of controlling an amount of a sheet to be conveyed by each of the rotary driving means, and a means of controlling a differential amount of a sheet to be conveyed for providing the plurality of rotation amount control means with information on the amount of a sheet to be conveyed, is configured so that the length of a sheet to be supplied to a sheet stretching section 1 disposed between the pair of conveyance rollers 8, 12 and the length of a sheet to be ejected therefrom can be controlled by the means of controlling a differential amount of a sheet to be conveyed. The length of a sheet to be transferred at the upstream side in the sheet stretching section 1, wherein tension is to be controlled, is always controlled shorter by a prescribed value than the length of a sheet to be transferred at the downstream side therein by the means of controlling a differential amount of a sheet to be transferred.

Description

The present invention relates to a winding device for winding a sheet-like member around a roller, and more specifically, a small roll having a specified length is created from a raw fabric drum on which a long sheet is wound. The present invention relates to a sheet winding device. In particular, the present invention provides a method of winding an ultrathin sheet of several tens of μm or less at high speed without defects such as wrinkles and an apparatus using the method.
Further, the present invention relates to a method for controlling and holding the sheet tension to a minute tension with high accuracy, and relates to a sheet sheet handling apparatus that requires minute tension control.

In an apparatus for handling a sheet-like member, it is very important to handle the sheet without wrinkles. In particular, in a sheet winding apparatus, it is no exaggeration to say that winding a sheet without wrinkles is an essential matter. Further, even in an apparatus that performs a coating process or a pattern forming process on a sheet, wrinkles cause uneven coating and pattern defects. Therefore, it is necessary to handle wrinkles so that they do not occur.
In order to suppress wrinkling of the sheet, the tension management of the sheet is extremely important. When the sheet tension decreases, the sheet sags and wrinkles easily occur in the stretch section. If the sheet tension becomes too high, the sheet is compressed in the width direction corresponding to the Poisson's ratio, and wrinkles are generated.

  Patent Document 1 and Patent Document 2 disclose a system for stabilizing tension by controlling a stretch distance and tension of a sheet by a position variable roll called a dancer roll in the sheet handling apparatus. Many factors can cause tension to be unstable. Patent Document 1 is a mechanism for maintaining a constant tension of the sheet on the side where the winding has been completed when switching the winding shaft.Patent Document 2 is a mechanism for controlling a plurality of tension fluctuations due to eccentricity of the original fabric. A dancer roll is placed.

Patent Documents 3 and 4 disclose a method of suppressing tension fluctuations by controlling the rotational speed of the unwinding shaft by paying attention to tension fluctuations due to fluctuations in the unwinding speed.
Patent Document 3 is a method of suppressing fluctuations in tension caused by fluctuations in the unwinding speed of the original fabric caused by eccentricity of the original fabric. A method of detecting the eccentricity of the original fabric with a sensor and making the unwinding speed of the original fabric substantially constant is disclosed.

  Patent Document 4 suppresses a variation in tension due to a change in the unwinding speed by reducing the diameter of the tape supply shaft with unwinding. The diameter on the tape supply shaft side is estimated from the wound tape length and the number of rotations of the unwinding shaft, and the unwinding speed is controlled.

  In known examples such as Patent Document 3 and Patent Document 4, since it is difficult to perform sufficient tension control only by controlling the drive system, it is assumed that a position variable roll such as a dancer roll is used in combination.

  Patent Document 5 discloses a method that does not use a position variable roll such as a dancer roll. In Patent Document 5, a driving device such as an unwinding device or a winding device is configured by a torque adjustable electric motor, and the tension is controlled by controlling the driving torque. In Patent Document 5, a take-up device is arranged between the unwind device and the take-up device, and the drive torque of the unwind device and the take-up device is controlled so as to match the sheet conveyance speed detected by the take-up device. A system for stabilizing the sheet tension is disclosed.

JP2010-013197 Patent 0291138 Patent 02683892 Patent 04439103 Patent 082202027

  An object of the present invention is to provide a method and apparatus capable of stable handling and winding without wrinkles even on a sheet member having very low rigidity such as a thin plastic sheet having a thickness of several tens of μm or less. Since a sheet having a lower rigidity extends more greatly with a low tension, it is required to stably control to a lower tension in order to prevent wrinkling.

  In the method using a dancer roll or the like disclosed in Patent Literature 1 and Patent Literature 2 or the like, the dancer roll itself becomes a friction load on the sheet, and therefore, a tension fluctuation due to the dancer roll occurs. Further, when the sheet is accelerated or decelerated, there is a problem that inertia (inertial force) of a contact roll member such as a dancer roll causes a change in tension in the sheet. In particular, the greater the rapid acceleration / deceleration is required, the greater the tension variation is given to the sheet.

  Patent Document 3 also describes problems such as the dancer roll method. When the pulsation of the unwinding speed due to the eccentricity of the original fabric roll is large, the dancer roll moves up and down, which may cause a significant tension fluctuation. Therefore, in Patent Document 3, the eccentricity of the original roll is detected, and the rotation of the original shaft is subjected to periodic fluctuations for each rotation, thereby realizing a substantially uniform unwinding of the original roll. ing. However, since there is a limit to this rotational speed control, it is assumed that the tension is corrected by using a dancer roll together.

  Patent Document 4 corrects a change in the unwinding speed due to a decrease in the diameter of the tape supply shaft on the unwinding side. The diameter on the tape supply shaft side is calculated from the length of the wound tape and the rotation speed of the unwinding shaft. Such a method of estimating inevitably causes an estimation error. This known example also requires an over-tension prevention method that is based on the premise that dancer rolls are used in combination, and dancer rolls are also arranged in the examples in the patent literature.

  Patent Document 5 has a configuration in which a movable roller member such as a dancer roll is not disposed between the unwinding device and the winding device. Instead, the unwinding device and the winding device are constituted by a torque adjustable motor. Then, the take-up device is arranged between the unwinding device and the take-up device, the sheet speed is detected, and the unwinding device and the take-up device are driven so that the sheet speed becomes a target value. The sheet tension is stabilized by controlling the torque.

  However, even in this embodiment, fluctuations in tension due to friction of the take-up device and inertial force are inevitable. Further, there is a limit to the tension controllability of the seat by the torque adjustable motor. In the control by the driving torque, when the torque cross due to the friction of the motor or the bearing changes, the torque transmitted to the seat changes. That is, it can be easily guessed that the tension changes. However, it is difficult to accurately grasp the torque cross due to such friction that changes with time. For this reason, the tension control method using the torque of the motor also has a limit as low tension handling for a low rigidity sheet such as a thin plastic sheet.

  An object of the present invention is to provide a low-tension sheet handling method capable of sheet handling without wrinkling even in a low-rigidity sheet such as a thin plastic sheet having a thickness of several tens of μm or less, and a sheet winding device to which the existing method is applied. There is.

  In order to achieve the above object, a plurality of conveyance rollers for conveying a sheet and a plurality of rotation driving means capable of independently controlling the rotation angles of the plurality of conveyance rollers are arranged, and the rotation driving means A rotation angle for controlling the sheet feed amount to a specified value is calculated, and a plurality of rotation amount control means for controlling the sheet conveyance amount by the respective rotation driving means and a sheet to be conveyed to the plurality of rotation amount control means A sheet conveyance amount difference control means for providing feeding amount information is provided. The sheet conveyance amount difference control unit is configured to form a plurality of conveyance amount command signals having a predetermined conveyance amount difference based on the conveyance command signal and to control the plurality of rotation driving units.

  Further, the sheet conveyance amount difference control means is a control means for controlling the sheet tension in the sheet stretching section between the conveying rollers having adjacent rotation driving means, and is the sheet stretching section to be tension controlled. The sheet conveyance length by the upstream rotational drive means in the sheet tension control section is controlled so as to be always less than the sheet conveyance length by the downstream rotational drive means in the sheet tension control section. To do. In addition, the specified value of the difference between the sheet conveyance length by the downstream rotation driving means and the sheet conveyance length by the upstream rotation driving means can be changed according to conditions such as the type of the conveyance sheet and the surrounding environment.

  Further, the winding angle at which the contact member such as a non-drive control roller arranged in the sheet tension control section contacts the sheet is 60 degrees or less.

  Further, a sheet tension abnormality detecting means for detecting that the sheet tension within the sheet tension control section is at least a specified value or less than a specified value and has reached at least one state of breakage is disposed.

  In addition, there is a means for detecting sheet sagging in the sheet tension control section, and initial tension setting for changing from a slack state to a specified tension state in the sheet tension section to be tension controlled. Set the mode. In the initial tension setting mode, only the upstream rotational drive means in the sheet tension control section is driven, or both the upstream and downstream rotational drive means are larger than the difference in sheet conveyance length that controls the predetermined tension. The sheet sagging removal operation for roughly removing the initial sheet slack by controlling the sheet transport length difference, and the sheet tension is stabilized to the specified value after the sheet sagging is roughly removed. It comprises a tension stabilization drive operation for controlling both the upstream and downstream rotary drive means in the tension control section to drive for a specified time with a predetermined transport amount difference.

  In the sheet tension control section, a sheet path guide means composed of a roll and a plate member close to a sheet tension path with a specified tension is disposed. When the sheet path changes over time, the sheet path guide means is provided with a movable mechanism that detects the change in the sheet path and moves to maintain a predetermined proximity distance.

  Further, at least one of the plurality of conveying rollers arranged to convey the sheet includes a rotation driving unit capable of controlling the rotation angle of the conveying roller, and a rotation deceleration brake unit that decelerates the rotation of the conveying roller. It is also provided. The rotational deceleration brake means is provided with brake strength control means for variably controlling the brake strength using one or more parameters of rotational speed, deceleration speed, and deceleration acceleration while the brake strength is variable. The rotation deceleration brake means is a torque controllable motor such as an induction motor, and controls the braking force by controlling the rotation speed of the motor in a no-load state to be slower than the target speed. . In addition, the rotational deceleration brake means is a regenerative brake means that can recover the braking force as electric power.

  In addition, at least one of the plurality of transport rollers arranged to transport the sheet, a transport length detection unit that detects at least one of the sheet length entering the transport roller or the sheet length ejected is provided. The rotation amount control unit of the conveyance roller sequentially calculates and controls the rotation angle of the rotation driving unit so that the conveyance length by the conveyance length detection unit coincides with a designated value that is sequentially supported from the sheet conveyance amount difference control unit. Configure. The transport length detecting means is a rigid roll. In addition, the roll-shaped member is provided with a roll pressing control unit that can control the pressing to the conveying roller, and controls the pressing of the detection roll by using at least one of the sheet conveying speed and the sheet conveying acceleration. Further, the roll-shaped member has an outer peripheral length that is not more than a fraction of a sheet tension control section length for controlling the sheet tension between adjacent conveyance rollers.

  Further, the apparatus includes conveyance roller eccentricity storage means for detecting and storing an eccentric pattern of the conveyance roller from the sheet conveyance length detected by the conveyance length detection means and the rotation angle position of the conveyance roller, and controlling the rotation amount of the conveyance roller. The means corrects and controls the rotation angle amount of the rotation driving means of the conveyance roller in accordance with the information in the conveyance roller eccentricity storage means. When the transport length detection means is a roll-shaped member, the transport length detection means has a detection roll eccentricity storage means for storing the rotational eccentricity of the transport length detection means made of the roll-shaped member, and the transport roller rotation amount control means Using the information in the detection roll eccentricity storage means, the rotation angle amount of the rotation driving means of the transport roller is corrected and controlled.

  Further, in order to control the sheet traveling position, sheet traveling position detecting means for detecting a traveling position in the width direction of the sheet at any position in the sheet traveling region, and An original fabric roll position variable means capable of changing the position in the rotation axis direction is provided, and the original roll position variable means is controlled according to the detection result of the sheet traveling position detection means.

  Further, in order to control the sheet tension in the specific section, at least one of the upstream side and the downstream side of the sheet tension control section, the non-tension for controlling the sheet tension to zero or sufficiently smaller than the sheet tension control section. A control section is arranged, and a travel position control section for controlling the travel position in the width direction of the seat is provided upstream of the seat tension control section and the no-tension control section.

  According to the above configuration of the present invention, the plurality of conveyance rollers for conveying the sheet and the plurality of rotation driving means capable of independently controlling the rotation angles of the plurality of conveyance rollers are arranged, and each rotation driving means A rotation angle for controlling the sheet feed amount by the specified value is calculated, and a plurality of rotation amount control means for controlling the sheet conveyance amount by the respective rotation driving means and the plurality of rotation amount control means should be conveyed Sheet conveyance amount difference control means for providing sheet feeding amount information is provided. The sheet transport amount difference control means is configured to form a plurality of transport amount command signals having a predetermined transport amount difference based on the transport command signal, and to control the plurality of rotation driving means. The sheet length to be supplied and the sheet length to be discharged can be controlled in the sheet stretch section between the conveying rollers.

  Further, according to the configuration of the present invention, the sheet conveyance amount difference control means is a control means for controlling the sheet tension in the sheet stretching section between the conveyance rollers having the adjacent rotation driving means, and is a tension control object. The sheet conveyance length by the upstream rotational drive means in the sheet tension control section that is the sheet stretch section is always less than the sheet conveyance length by the rotational drive means downstream of the sheet tension control section by a specified value. It is possible to control the stretch amount of the stretched sheet to the specified value accurately in the sheet tension control section, and to calculate the tension calculated from the elastic modulus of the sheet. The tension can be precisely controlled to the value.

  In addition, according to the configuration of the present invention, the specified value of the difference between the sheet conveyance length by the downstream rotation driving unit and the sheet conveyance length by the upstream rotation driving unit is determined depending on conditions such as the type of conveyance sheet and the surrounding environment. By making it changeable, the sheet tension in the sheet tension control section can be stabilized at a specified value regardless of the type of transported sheet and the surrounding environment.

  Furthermore, in the configuration of the present invention, even when a contact member such as a non-drive control roller is disposed in the sheet tension control section, the contact angle with the sheet is set to 60 degrees or less, so that the non-drive control roller Since the sheet pressing force is equal to or less than the sheet tension, the influence of the non-drive control roller on the sheet tension can be suppressed to a minimum.

  In the system of the present invention described above, the sheet tension is controlled with high accuracy by controlling the sheet conveyance amount instead of directly controlling the sheet tension, so that it is difficult to detect a control abnormality. Therefore, in the configuration of the present invention, a sheet tension abnormality detecting means for detecting that the sheet tension in the sheet tension control section has reached a state of at least one of a predetermined value or more, or a specified value or less. Therefore, safety can be ensured by preventing abnormal operation.

  Similarly, in the method of the invention, since the sheet conveyance amount is controlled without using a tension applying mechanism or the like, the tension is not applied to the sheet immediately after the sheet is installed.

  Therefore, in the configuration of the present invention, there is a means for detecting the slack of the sheet in the sheet tension control section, and from the state in which the slack is generated in the sheet stretch section to be the tension control target to the specified tension state. An initial tension setting mode is provided. In the initial tension setting mode, only the upstream rotational drive means in the sheet tension control section is driven, or both the upstream and downstream rotational drive means are larger than the difference in sheet conveyance length that controls the predetermined tension. The sheet sagging removal operation for roughly removing the initial sheet slack by controlling the sheet transport length difference, and the sheet tension is stabilized to the specified value after the sheet sagging is roughly removed. It comprises a tension stabilization driving operation for controlling both the upstream and downstream rotational drive means in the tension control section to drive for a specified time or a specified sheet length with a predetermined conveyance amount difference. Accordingly, in the configuration of the present invention, the sheet tension in the sheet tension control section can be automatically and smoothly stabilized at the regulation value from a state in which no tension is applied to the sheet immediately after the sheet is installed.

  Furthermore, according to the configuration of the present invention, the sheet path guide means including a roll and a plate member close to the sheet tension path at the specified tension is disposed in the sheet tension control section, so that the sheet in the sheet tension control section is arranged. Even when sheet vibration occurs during acceleration / deceleration due to low tension, the vibrating sheet surface comes into contact with the sheet path guide means to prevent resonance and effectively suppress unnecessary vibration. can do. In addition, even when the sheet path changes with time, the sheet path guide means is provided with a movable mechanism that can move to detect a change in the sheet path and maintain a predetermined proximity distance. With the configuration, it is possible to obtain the same effect.

  Furthermore, as the additional configuration in the present invention, a rotation driving means capable of controlling the rotation angle of the conveyance roller and a rotation deceleration brake means for decelerating the rotation of the conveyance roller are provided together with the brake strength of the rotation deceleration brake means. By providing a brake strength control means that variably controls the brake strength using one or more parameters of rotational speed, deceleration speed, and deceleration acceleration, it is possible to drive a raw material with large rotational inertia or a transport roll. In this case, it is possible to select a low-cost motor with a small output torque as the rotation driving means capable of controlling the rotation angle. Further, the rotational deceleration brake means is a torque controllable motor such as an induction motor, and controls the braking force by controlling the rotational speed of the motor in a no-load state to be slower than the target speed. The rotational deceleration brake means is a regenerative brake means capable of recovering the braking force as electric power, thereby enabling a more energy efficient operation.

  Further, as the additional configuration in the present invention, a conveyance length detection unit that detects at least one of a sheet length entering the conveyance roller or a sheet length discharging from the plurality of conveyance rollers arranged to convey the sheet. And the rotation amount control unit of the conveyance roller sequentially calculates the rotation angle of the rotation driving unit so that the conveyance length by the conveyance length detection unit coincides with a specified value that is sequentially supported from the sheet conveyance amount difference control unit. By configuring so as to control, it is possible to control the sheet conveying length with high accuracy without being affected by the eccentricity of the conveying roller, and it is possible to perform further highly accurate low tension sheet stretching control.

  In addition, in the configuration of the present invention, the conveyance length detection means is a rigid roll, so that a stable conveyance length can be detected while suppressing diameter fluctuation. In addition, the roll-shaped member is provided with roll pressing control means capable of controlling the pressing to the conveying roller, and controls the pressing of the detection roll by using at least one of the sheet conveying speed and the sheet conveying acceleration. Further, it is possible to prevent the measurement accuracy from being lowered due to slip or the like at the time of acceleration / deceleration of the rigid roll as the conveyance length detecting means, and to suppress the influence of the rigid roll pressing on the conveyance roll or the raw material to the minimum.

  In the configuration of the present invention, the conveyance length detection unit is configured such that the outer peripheral length of the roll-shaped member serving as the conveyance length detection unit is less than or equal to a fraction of the sheet tension control section length between adjacent conveyance rollers. The tension fluctuation error due to the eccentricity of the roll-shaped member can be suppressed to a fraction or less. This is because the maximum fluctuation value of the conveyance amount due to eccentricity is less than a fraction of the length of the stretched sheet in the sheet tension control section, so the effect on the sheet tension in the sheet tension control section is less than a fraction. By being suppressed to.

  Further, in the configuration of the present invention, it has conveyance roller eccentricity storage means for detecting and storing the eccentric pattern of the conveyance roller from the sheet conveyance length detected by the conveyance length detection means and the rotation angle position of the conveyance roller, The conveyance roller rotation amount control unit corrects and controls the rotation angle amount of the rotation driving unit of the conveyance roller according to the information in the conveyance roller eccentricity storage unit. When the transport length detection means is a roll-shaped member, the transport length detection means has a detection roll eccentricity storage means for storing the rotational eccentricity of the transport length detection means made of the roll-shaped member, and the transport roller rotation amount control means By using the information of the detection roll eccentricity storage means to correct and control the rotation angle amount of the rotation driving means of the conveyance roller, the conveyance roller is one of the largest factors as the sheet conveyance length error by the conveyance roll. In addition, the influence of the eccentricity of the detection roll provided for detecting the conveyance length can be prevented, and the conveyance amount can be controlled with high accuracy. Thereby, high-precision low tension control in the sheet tension control section is possible.

  Further, in the configuration of the present invention, in order to control the seat travel position, the seat travel position detection means for detecting the travel position in the width direction of the seat at any position in the seat travel region, and the sheet is driven to be unwound and supplied A sheet roll position variable means capable of changing the position of the sheet roll in the rotation axis direction is provided, and the sheet roll position variable means is controlled according to the detection result of the sheet traveling position detection means, thereby conveying sheet position Suppresses fluctuations in the width direction and prevents the sheet being conveyed from exceeding the predetermined range and meandering in the width direction.

  Further, as a basic configuration of the present invention, in order to control the sheet tension in a specific section, at least one of the upstream side and the downstream side of the sheet tension control section, the sheet tension is zero or more than the sheet tension control section. By arranging the non-tension control section that controls to a sufficiently small tension, it is possible to suppress the influence of the upstream or downstream tension value on the sheet tension in the sheet tension control section. Furthermore, by providing a travel position control section that controls the travel position in the width direction of the seat on the upstream side of the seat tension control section and the non-tension control section, it is possible to easily stabilize the travel position in the width direction of the seat. It becomes possible.

  For the reasons described above, by applying the configuration of the present invention, it is possible to provide a low tension sheet handling method capable of handling a sheet without wrinkles even in a low rigidity sheet such as a thin plastic sheet having a thickness of several tens of μm or less. By applying the existing system, it is possible to provide a low tension sheet handling apparatus and a sheet winding apparatus.

It is a figure for demonstrating the fundamental component of the sheet handling apparatus for implement | achieving this invention. It is a figure which shows typically the sheet stretch part between an infeed roll and an output roll. It is a figure explaining the relationship between a) sheet conveyance speed of an in / out roll, b) sheet length of a stretch part (at the time of no tension), c) sheet extension of a stretch part, and d) sheet tension of a stretch part. . FIG. 6 is a diagram schematically illustrating a change in tension until a tensionless sheet is stabilized by sheet conveyance difference driving. It is the figure which showed typically the behavior until sheet tension stabilization by the conveyance force difference drive when the conveyance amount of an in / out roll has an eccentric vibration. It is a figure for demonstrating one Example of the sheet winding apparatus to which the highly accurate sheet tension control system of this invention is applied. It is a figure which shows the example of the stress strain diagram at the time of the tension test of a general plastic sheet. It is a figure explaining the other Example of the sheet winding apparatus to which this invention is applied.

  The principles and embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 is a diagram showing an embodiment for explaining basic components of a seat handling apparatus for realizing the present invention. First, the basic configuration of the sheet handling apparatus of the present invention and the basic principle that enables high-precision control of sheet-like member tension will be described. In the apparatus of FIG. 1, the sheet stretching section near the center is the high-precision microtension control section 1. The high-precision tension control section 1 is a section in which a sheet is stretched by two sheet transporting means, that is, a sheet feeding means 8 for feeding a sheet to the section and a sheet feeding means 12 for feeding the sheet from the section. The sheet feeding means 8 at the upstream end of the section and the sheet feeding means 12 at the downstream end of the section are transporting means capable of controlling the sheet feeding and sending amounts of the sheet to the section with high accuracy.

  First, a description will be given of an embodiment in which the sheet feeding means 8 and the sheet feeding means 12 shown in FIG. For the sake of explanation, the apparatus shown in FIG. 1 has different configurations for the sheet feeding means 8 and the sending means 12.

  As an example of the first highly accurate sheet conveying system, the configuration on the sheet sending means side will be described. The sheet feeding means 12 in FIG. 1 has a configuration in which a pressing roll 11 provided with an elastic layer on its surface is pressed against a conveying roll 12 made of a rigid body such as metal. The conveyance roll 12 and the pressing roll 11 sandwich the sheet, and the sheet conveyance conveyance amount is controlled by the rotation amount of the rigid roll 12. Since the roll diameter does not change even in the area where the sheet is sandwiched because the conveyance roll side is a rigid body, the sheet conveyance amount can be controlled relatively accurately by controlling the rotation amount of the rigid roll 12 It has become. The reason why the surface layer of the pressure roll 11 is an elastic layer is to hold and convey the sheet stably and reliably.

  Even in such a configuration, there is a concern that an error may occur in the sheet conveyance amount due to the eccentricity of the conveyance roll 12 or the like. As a configuration for correcting the influence of the eccentricity of the conveying roll, the sheet feeding means of FIG. 1 is provided with an eccentricity detecting means 14 for detecting the eccentricity of the conveying roll and an eccentric storage means 15 for storing the eccentricity. The detection of the eccentricity of the transport roll 12 can be realized relatively easily by using the optical non-contact distance sensor 14 or the like. The eccentricity of the transport roll is detected by the eccentricity detecting means 14 in advance or in real time, and temporarily stored in the eccentricity storage means 15. Then, from the detected eccentric pattern, a driving pattern for the conveying roll that cancels the fluctuation of the conveying amount due to the eccentricity is generated by the motor driving pattern control means 13, and the delivery-side conveying roll driving motor 47 is controlled. The drive motor 47 of the delivery-side transport roll is provided with an encoder, and the rotation amount of the motor is controlled with high accuracy according to the generated motor drive pattern. As a result, it is possible to realize highly accurate sheet delivery amount control that also corrects the conveyance roll eccentricity.

  As another embodiment of the highly accurate sheet conveying method, the configuration on the sheet feeding means side in FIG. 1 will be described. The sheet feeding means 8 has a configuration in which a pressing roll 7 made of a rigid body such as metal is pressed against a conveying roll 8 having an elastic layer on the surface. In this method, since the conveyance roll is deformed at the position where the sheet is sandwiched, the sheet conveyance amount cannot be controlled with high accuracy only by the rotation angle of the conveyance roll 8. Therefore, the pressing roll 7 facing the transport roll 8 is a rigid roll, and means for detecting the amount of rotation of the pressing roll 7 is provided. Since the rigid pressing roll hardly deforms, the sheet conveyance amount can be detected relatively accurately from the rotation amount. Based on the detection result of the sheet conveyance amount, a driving pattern of the driving motor for the sheet feeding roll is generated by the motor driving pattern control means 10. In this configuration, since the sheet conveyance amount is directly detected by the pressing roll 7, it is possible to control the sheet conveyance amount including the influence of the eccentricity of the sheet conveyance roll. However, when the eccentricity on the side of the pressing roll is large, a detection error of the conveyance amount is caused. When the amount of eccentricity of the pressing roll 7 is at a level that causes a problem in the conveyance amount measurement, the eccentricity of the pressing roll is detected and stored in the same manner as disclosed in the sending-side conveyance roll of this embodiment, and the conveyance roll By correcting and reflecting the correction to the motor drive pattern by the motor drive pattern control means 8, higher accuracy can be realized. In the embodiment of FIG. 1, the eccentricity detection control means of the pressing roll 7 of the sheet feeding means is not provided.

In a winding device (FIG. 6) to be described later, the original fabric roll 51 itself is driven. In this case, the raw roll 51 corresponds to the transport roll 8, and the driving diameter of the raw roll 51 cannot be determined. Therefore, as in the configuration using the elastic transport roll 8 described above, a rigid press roll on the surface is used. A method that detects the transport amount by pressing 7 is effective. Details of the winding device to which the present invention is applied will be described later.
Next, a method for controlling the tension of the sheet section 1 stretched by the above-described high-precision sheet conveying means with high accuracy will be described. As shown in FIG. 1, the motor drive pattern control means 10 and 13 in the sheet feeding and unloading means 8 and 12 arranged at the upstream and downstream ends of the high-precision microtension control section are separated from the high-precision feed amount difference control means 16. According to the command, the sheet feeding amount to the section and the sheet feeding amount from the section are controlled. The high-accuracy feed amount difference control means 16 commands each motor drive pattern control means for the conveyance amount so that the sheet feed amount is less than the sheet feed amount by a specified amount. By appropriately controlling this feed amount difference, the tension in the high-precision minute tension control section 1 can be controlled with high accuracy.

  FIGS. 2 and 3a to 3d are schematic diagrams for explaining a change in tension in the stretch section when a difference is actually provided between the sheet feeding amount and the sheet feeding amount. FIG. 3a to FIG. 3C show how the sheet that is initially slack as shown by the one-dot chain line 36 in the drawing changes in the sheet section 1 stretched between the sheet feeding roll and the sheet feeding roll as shown in FIG. Explained in d.

  FIG. 3a shows the sheet transport speed with the in and out rolls. Based on the sheet feeding speed, three types of sheet feeding speeds of + 0.5%, -0.5%, and -1.0% are shown. FIG. 3b shows the length of the sheet existing in the sheet stretching section when there is no tension at each sheet feeding speed. Since the distance 1 between the sheet feeding roll and the sheet feeding roll does not change, the actual sheet is stretched. In FIG. 3b, the non-tensioned length of the sheet existing in the sheet stretching section converges to a certain length over time, which is due to the extension of the sheet 34 in the stretching section. The length of the sheet existing in the sheet stretching section 1 when there is no tension when it is balanced with the length of the sheet conveyed to the stretching section 1 by the feeding roll due to a decrease in the amount of sheets sent out. Is stable. Figure 3c shows the seat elongation in the stretch section, which is also stable at a constant elongation. FIG. 3d shows the sheet tension predicted from the sheet elongation and the elastic modulus of the sheet, and is stable at a constant tension. In FIG. 3, although schematically shown for explanation, a phenomenon in which the tension converges to a certain level was confirmed also in experiments and analytical tests performed on several types of sheets.

  In this way, the tension in the stretch section is stabilized to the predetermined tension value by conveying the sheet for a certain length or longer with a difference between the sheet feed amount and the sheet feed amount in the stretch section 1. can do. By using the method of the present invention, the tension can be controlled with higher accuracy than in the past.

  As disclosed in the publicly known examples and the like, as a conventional tension control method, a tension control and detection method using a contact member such as a dancer roll is applied. In the method using these contact members, the sheet tension in the target section is affected due to the frictional load of the contact member on the sheet for detecting and controlling the tension. In particular, during the acceleration / deceleration operation of the seat, the inertial force of the contact member also has an effect, which becomes a further tension fluctuation factor. Further, a system for controlling the torque of the motor in order to control the tension of the sheet is disclosed, but the motor torque is not directly reflected in the sheet tension. Friction generated at various locations including the motor bearings and the like becomes a disturbance that disturbs the correlation between the motor torque and the sheet tension, so that it is difficult to control the sheet tension with high accuracy.

  Compared with these conventional methods, this method does not require the arrangement of contact members that may cause a disturbance of tension in the tension control section. In addition, since the tension in the corresponding section is controlled based on the difference in sheet conveyance amount, there is no fluctuation such as friction of each part. For these reasons, the system of the present invention in which the tension is set to the specified value by controlling the difference in the conveyance amount of the sheets fed into and sent out to the corresponding section can provide a highly accurate and stable tension control section. Further, in the system of the present invention, since inertia force other than the mass of the sheet itself does not become an inertial force, it is possible to maintain a very stable tension even during sudden acceleration / deceleration.

  In order to realize a high-precision tension control section according to the method of the present invention, in addition to the above-described high-precision control system for the sheet feeding amount and the feeding amount to the corresponding section, it is necessary to devise sheet handling before and after the corresponding section. It is.

  Next, in the present invention, the necessary conditions before and after the corresponding section for realizing the high-precision tension control section will be described.

  As described above, the high-precision tension control section of the present invention is configured by the sheet feeding means and the sheet carrying-out means to the section, and the sheet feeding means and the sheet carrying-out means can control the sheet conveyance amount with high precision. This is a technique for controlling the tension in the corresponding section by realizing it. In the case where the sheet feeding means and the sheet unloading means are conveying rolls as shown in FIG. 1, the sheet tension on the upstream side of the sheet feeding roll and the downstream side of the sheet unloading roll affects the sheet conveying amount. . In order to realize a stable sheet conveyance amount by the sheet feeding means and the sheet unloading means, it is necessary to control the sheet tension in the upstream and downstream areas of the high-precision tension control section to a specified value. The sheet tension in the upstream / downstream area needs to be equal to or higher than that of the high-precision tension control section to be controlled. For this reason, as a practical method, it is preferable to control the tension to be sufficiently small with respect to no tension or a high-precision tension control section.

  FIG. 1 discloses a method of creating a section provided with a sheet slack as an example of forming the no-tension or micro-tension control sections 2 and 3. The method shown in the figure is a method of forming a non-tension section by giving a sheet slack between stretching rolls and controlling the amount while detecting the slack.

  Further, only in the high-precision tension control section of the present invention and the no-tension or micro-tension control sections 2 and 3 arranged before and after the high-precision tension control section, there is a high possibility that the movement of the sheet in the width direction, so-called sheet meandering. As a method for preventing this, it is effective to provide a width direction travel position control section 4 for controlling the width direction position of the upstream seat. FIG. 1 shows a system in which a tilted roll, that is, a so-called steering roll 32 is brought into contact with a sheet section to which a certain amount of tension is applied, as an embodiment of the sheet width direction position control means. It is known that the movement of the sheet in the lateral direction (meandering) can be easily generated by shifting the parallelism between the stretching rolls in a state where tension is applied. The magnitude of the moving speed in the width direction is determined by the tension of the sheet, the sheet winding angle around the tension roll, and the inclination angle of the tension roll. Needless to say, the details of these parameters need to be determined based on the physical properties of the sheet to be used.

  In one embodiment of the width direction position control section in FIG. 1, one of the stretching rolls (steering roll 32) is inclined according to the signal of the sensor 30 that detects the width direction of the seat. Also, means 31 for applying tension to the sheet in the corresponding section by pressing the roll against the stretch sheet was provided.

  Since the tension in the high-precision tension control section 1 and the tension or the fine tension control sections 2 and 3 is sufficiently small, the force for moving (meandering) the sheet in the lateral direction is small. For this reason, it is possible to easily control the seat travel position by arranging the width direction travel position control section 4 as described above on the upstream side. Needless to say, the sheet tension in the width direction travel position control section 4 needs to be sufficiently larger than the high-precision tension control section 1 and the tension or fine tension control sections 2 and 3.

  Next, about the various members and mechanisms required in the apparatus to which the sheet drive control system of the present invention that controls the tension of the stretched sheet with high accuracy by the sheet conveyance amount will be described.

  The first point is the seat vibration prevention means in the seat stretch section. In the apparatus of the present invention, the sheet tension stretched between the sheet feeding roll and the sheet feeding roll is controlled with high accuracy. As described above, by not providing a contact member on the sheet in the tension control section, the sheet tension can be maintained with high accuracy and stability even during acceleration / deceleration of the sheet conveyance speed. However, it is predicted that the seat in the stretch section vibrates due to the acceleration / deceleration of the seat or the transmission of external vibration. In particular, when an external force corresponding to the resonance frequency of the stretching sheet portion is applied, a large vibration in the stretching section is generated. Since the vibration of the sheet causes a change in the length of the stretch section, the sheet tension changes as it is. Further, the vibration of the sheet becomes an obstacle when a process for performing some kind of processing is provided on the sheet stretching surface. For this reason, generation | occurrence | production of such a vibration needs to be suppressed or prevented.

  As a method for preventing such vibration of the sheet stretching portion, it is effective to dispose a rod-shaped or surface member in the vicinity of the sheet stretching path.

  By disposing a member in the vicinity of the sheet stretching path, it is possible to prevent the vibration that has been started from coming into contact with the sheet that has started to vibrate, and to stabilize the sheet stretching path. Needless to say, the vibration preventing member 19 is more effective when installed on an abdominal portion where the amplitude increases when vibration occurs.

  The second point is anomaly detection means. In the system of the present invention, the sheet is stretched only by the feeding / unloading roll, and the sheet tension in the stretching section is controlled only by the amount of the sheet to be conveyed. For this reason, it is necessary to provide means for detecting that an abnormality has occurred in the seat stretch section. Abnormal modes include excessive tension, excessive tension and sheet breakage. As a method of detecting excessive tension without contacting the sheet in the stretch section, a method of detecting wrinkles generated on the sheet with the optical sensor 20 or the like is effective. An object of the sheet handling apparatus of the present invention is to stabilize the sheet surface with a fine tension that does not cause wrinkles. When a unidirectional tension is applied to the sheet, the width direction tends to shrink and wrinkles are generated. If wrinkles occur, the light reflection direction and the transmission direction are shifted, so that it can be detected by the transmission or reflection type optical sensor 20. With this method, it was possible to detect minute tension fluctuations that caused minute sheet surface deformation. The under tension can be dealt with by providing a sensor for detecting sheet contact with a guide member or the like disposed in the vicinity of the tension path. An optical distance sensor or the like can be used as the sensor. For rupture, a general transmission or reflection optical sensor can be used.

  In the embodiment of the present invention shown in FIG. 1, the guide plate 18 on which the optical sensor 20 is disposed is disposed in the vicinity of the section path where the sheet stretching section for tension control is stretched. The guide plate 18 is provided with several protrusions 19 so as to suppress the vibration of the sheet. Further, reflection optical sensors 20 are arranged at a plurality of locations so that wrinkles, deflections and breaks of the sheet can be detected. In the apparatus of the present invention, it is necessary to arrange a guide member 18 incorporating such a sensor 20 in the high-precision tension control section 1. Abnormality detection results such as excess / under tension / breakage detected by the sensor 20 are sent to the high-precision feed amount difference control means 16 or the overall control means 17 of the system to perform emergency stop, abnormality notification, etc. It is necessary to control.

  Finally, as a third point, the apparatus startup method for adding the specified tension to the high-precision tension control section. In the seat handling device of the present invention, there is no mechanism for applying a direct tension such as a so-called tensioner to the seat stretching portion of the high-precision tension control section. For this reason, at the time of initial sheet setting or the like, no tension can be applied to the sheet in the high-precision tension control section 1, and the sheet becomes loose. Therefore, the sheet handling apparatus of the present invention requires an initial tension setting mode until the sheet tension in the high-precision tension control section is stabilized at a specified value. In the sheet handling apparatus of the present invention, the sheet tension in the high-precision tension control section is controlled by conveying the sheet. Therefore, it is necessary to prevent the waste of the sheet, and to reach the specified tension in the high-precision tension control section 1 with a small sheet feed amount.

  In the apparatus according to the embodiment of the present invention shown in FIG. 1, a guide plate 18 having a built-in optical sensor is arranged in the high-precision tension control section 1 for preventing vibration of the seat and detecting an abnormality. A sheet to which no tension is applied, such as during initial sheet setting, can be detected by the optical sensor 20 disposed on the guide plate 18.

  In the apparatus of the present invention, as an initial tension setting mode, first, only the downstream side transport roll, that is, the delivery roll 12 in the high-precision tension control section is driven at a low speed, and the sheet is sent to the outside of the detection of the sensor under tension. Thereafter, the upstream and downstream transport rolls, that is, the infeed roll 8 and the output roll 12 of the high-precision tension control section 1 are driven with a predetermined transport amount difference by the transport length necessary to apply the predetermined tension. After the above process is completed, a specified tension setting completion signal is generated.

  The above is the operation from the state where the sheet is slack, that is, the state where the tension is low. The sensor of the guide plate in the embodiment of the present invention can detect excessive tension by wrinkles. Even in the case of excessive tension, only the upstream transport roll, that is, the feed roll 8 in the high-precision tension control section is driven at a low speed, and the tension is adjusted close to the specified tension. The same specified tension setting can be performed by driving with a carry amount difference.

  In this embodiment, the drive direction of the transport roll is one direction. However, if the roll is allowed to be reversed, the slack can be removed by reversing the feeding roll 8 and the excessive tension can be released by reversing the sending roll 12. Needless to say.

  Since the guide plate of the present invention can detect wrinkles and deflections of the sheet in the high-precision tension control section 1, by performing such control, the sheet tension in the sheet tension control section can be set to an appropriate value with a small sheet conveyance amount. It becomes possible to.

  The guide plate 18 described in the embodiment of the present invention in FIG. 1 is an important member for preventing vibration of the seat, detecting abnormality, and initial tension setting operation in the high-precision tension control section 1. Further, the guide plate 18 also has a function as a temporary sheet placing table that prevents the broken sheet from falling into the apparatus and facilitates an initial sheet setting operation.

  Finally, the concept of the conveyance length necessary for applying the prescribed tension will be briefly described. FIG. 4 schematically shows the behavior of a tensionless sheet until the sheet tension is stabilized by driving the conveyance amount difference. The longer the sheet tension length in the high-precision tension control section, the longer the conveying time or conveying length until the specified sheet tension is reached. In the figure, 1S indicates a case where the sheet stretch length is half that of 1M, and 1L indicates a case where the sheet stretch length is twice that of 1M.

  FIG. 5 schematically shows the behavior until the sheet tension is stabilized by the driving force difference drive when the feeding amount of the feeding roll and the feeding roll has an eccentric vibration. The influence of the tension fluctuation due to the eccentricity of the transport roll becomes smaller as the length of the sheet stretch is longer. In the figure, it is shown how the sheet tension in the sheet stretcher is affected when the speed fluctuation of the feeding roll is 41 and the speed fluctuation of the feeding speed is 42. The tension fluctuation of 1S with the shortest sheet stretch length is the largest, and the tension fluctuation of 1M with the longest sheet stretch length is the smallest.

  In the apparatus of the present invention, it is necessary to determine the driving accuracy of the transport roll and the sheet stretch length in consideration of the required tension accuracy. In addition, it is necessary to determine the sheet conveyance length and conveyance time until the specified tension is applied in the high-precision tension control section.

  Next, an embodiment in which the sheet handling device technology using the high-precision sheet tension control system of the present invention described with reference to FIGS. 1 to 5 is applied to a sheet winding device will be described.

  FIG. 6 is a view for explaining an embodiment of a sheet winding apparatus to which the high precision sheet tension control system of the present invention is applied. In this embodiment, a description will be given using an example in which the sheet is wound on a small roll 53 from a thin plastic film original 51 having a sheet thickness of several 10 μm and a width of several tens of cm. In the apparatus shown in the figure, two rotation driving means 46 and 47 are disposed on the original roll 51 axis and the take-up drum axis 52. On the side of the original roll 51, the pressing roll 7 is disposed at the sheet feeding position. A pressing roll 48 is also disposed at the sheet winding position on the winding drum side. A sheet stretching region 1 is formed between the raw roll and the winding drum.

  This sheet stretch region corresponds to the high-precision tension control section 1 and forms a uniform surface without wrinkles on the sheet by controlling the tension to an appropriate value. The sheet on which the uniform plane is formed is stuck on the take-up drum 52 on the downstream side of the press roll 11 on the take-up drum 52, and then taken up on the small roll 53.

  In the winding device of this embodiment, in order to wind the sheet 34 around the small winding roll 53 without wrinkling, in the sheet stretching region 1 formed between the raw fabric roll 51 and the winding drum 52, a uniform surface without wrinkles It is most important to form For this purpose, it is necessary to control the sheet tension in the sheet stretching region 1 with high accuracy.

  Next, the sheet tension for forming a uniform surface without wrinkles will be briefly described. FIG. 7 shows an example of a stress-strain diagram during a tensile test of a general plastic sheet. Increasing the tension applied to the sheet causes the sheet to stretch. If a tension of a certain level or more is applied, the sheet will creep and the sheet will be plastically deformed. When the sheet is subjected to a remarkable region of tension, the sheet surface is wrinkled. Actually, the tension capable of forming a uniform surface without wrinkles was a region 55 having a very small deformation with a strain amount of 1% or less. Depending on the sheet material and thickness, some sheet types cannot prevent wrinkles from occurring unless the tension is controlled to a strain amount of 0.1% to 0.2% or less.

  In the case of the assumed ultrathin plastic film with a thickness of several tens of μm as the sheet to be handled by the apparatus of this embodiment, it is generally necessary to prevent the sheet from wrinkling and create a sheet plane although it differs depending on the sheet material. Assuming a stress of about 1 MPa or less and assuming a thickness of 10 μm and a width of 30 cm, it is necessary to stably control the tension value to about 300 gf or less (about 3 N or less). For thinner sheets and sheets with lower elastic modulus, it may be necessary to adjust the tension to several tens of gf.

  In the conventional system where the tensioner or the like is in contact with the surface on which the sheet is stretched used in sheet handling and the tension is controlled by the driving torque, it is realistic to stably hold and control this level of tension and carry the sheet. Is impossible.

  In the winding device of the embodiment of the present invention shown in FIG. 6, the pressing roll 7 installed on the raw roll side is a rigid roll, and an encoder 45 for detecting the rotation angle is attached. By detecting the rotation angle of the rigid roll 7 with the encoder 45, it is possible to detect the carry-out amount of the sheet from the original fabric. The rotation driving means attached to the roll roll shaft is controlled so that the carry-out length from the roll becomes a specified value. Since the diameter of the roll of the film sheet is uncertain, in this embodiment, the accuracy of the carry-out sheet length can be increased by detecting the carry-out amount of the sheet with a pressure roll provided at the sheet feed position. Secured.

  In addition, the pressing force 48 of the pressure roll 7 for detecting the carry-out amount disposed on the raw roll 51 of the present embodiment is large when the raw roll is accelerated or decelerated or driven at a high speed, and is operated at a low speed or a constant speed. Control was made to make it smaller when the vehicle was stopped or stopped. As a result, it is possible to prevent the pressing roll from slipping during acceleration and the like, and to prevent an error in the measurement of the conveyance length. Deformation can be prevented.

  As another driving method of the original roll 51 other than the present embodiment, a method of directly driving the original roll with the pressing roll 7 can be considered. This method is simpler than the system of the present embodiment, but since it is necessary to apply a high driving force to the raw roll 51 with the pressing roll 7, it is necessary to increase the pressing force 48. It is necessary to form an elastic layer on the surface of the pressing roll 7 to ensure a frictional force. When the elastic layer is formed on the surface of the pressing roll 7, the detection accuracy of the amount of the sheet carried out from the original roll 51 is lowered. Further, when an elastic layer is not formed on the surface of the pressing roll, it becomes difficult to transmit the driving force to the original fabric roll 51, so that sheet handling such as rapid acceleration and rapid deceleration becomes difficult.

  In consideration of these points, in the configuration of the present embodiment, the pressing roll is a rigid roll, the amount of the sheet transported is detected, and the original fabric shaft itself is driven.

  On the other hand, the take-up drum 52 side can make the take-up drum itself a rigid drum such as a metal. Therefore, in this embodiment, the surface of the pressing roll 48 is used as an elastic body, and the adhesion between the sheet and the take-up drum surface is improved. Secured. Since the pressing roll 48 on the winding drum 52 side has little influence on the sheet, in the embodiment of the present invention, the pressing force control like the pressing roll 7 on the original fabric roll 51 side is not applied.

  The sheet winding length control by the winding drum is a system in which the rotation angle of the winding drum 52 is detected by the encoder of the drive motor 47 and the rotation angle of the winding drum 52 is controlled. This is because the take-up drum 52 has a rigid structure, and therefore the take-up amount can be controlled relatively well. Of course, if it is necessary to control the winding amount with higher accuracy, a sensor for detecting the eccentricity of the winding drum 52 may be provided to correct the influence of the eccentricity as disclosed in FIG. In addition, there may be a method of controlling the amount of rotation of the winding drum by providing a sensor capable of directly detecting the amount of winding.

  Next, the diameters of the pressure roll 7 and the take-up roll 52 on the side of the original roll that detects the carry-out and take-up length will be described. As described above, the eccentricity of these rolls affects the unloading and winding length of the sheet. When the eccentricity affects the tension in the sheet stretching region, it is necessary to detect and control this to control the sheet conveyance amount. However, if the influence of the eccentricity can be reduced with respect to the target value of the sheet tension, it is not necessary to use an eccentricity detection control mechanism, and the apparatus configuration can be simplified. The influence of the eccentricity on the sheet tension varies depending on the roll diameter and the stretch length in addition to the eccentric amount.

  As described above, the eccentricity of the raw roll 51 and the take-up roll 52 affects the conveyance amount such as the sheet feeding amount and the feeding amount. In the method of obtaining the sheet carry-out amount by detecting the rotation angle of the pressure roll 7 as in the raw fabric side of the apparatus of FIG. It can be easily imagined that the eccentricity of the roll 7 also affects.

  It goes without saying that fluctuations in the conveyance amount and detection amount due to eccentricity occur at a cycle of one rotation of the conveyance roll and detection roll. That is, no error occurs in the transport amount and the detected amount when the transport roll and the detection roll rotate once. A transport amount that is greater than the specified value and a transport amount that is less than the specified value are repeated every half cycle. For this reason, the influence becomes small, so that the length of a sheet | seat stretch part is long.

  If the eccentric amount of the transport roll is 0.5%, the transport amount fluctuates by about ± 0.5% every half circle. If the outer peripheral length of the transport roll is L, the transport amount varies for each transport amount L / 2. If the sheet stretch length is 1 m, the transport roll diameter is approximately 31.8 mm, and the outer diameter is 100 mm, the transport amount fluctuation occurs every 50 mm, that is, 5% of the sheet stretch length. In this case, the influence on the stretch length of the transport roll eccentricity of 0.5% is 0.025%.

  An eccentricity of 0.5% in the conveyance roll diameter of 31.8 mm corresponds to about 160 μm, which is a level that can be sufficiently handled by the current processing technology. In the case of this level conveyance roll eccentricity, the influence on the stretch length is about 0.1% or less by setting the outer diameter of the conveyance roller to a fraction of the sheet tension control section length. If the target value of the sheet elongation due to tension to form a wrinkle-free sheet surface is set to about several percent, and there are almost no other fluctuation factors, target tension control can be performed without correcting the eccentricity of the transport roll. Is possible.

  The transport roll diameter, sheet stretch length, etc. also have restrictions on the device configuration. Consider the transport roll eccentricity, transport roll diameter, sheet stretch length, and the amount of sheet elongation that gives the target sheet tension. It is necessary to determine whether or not to perform eccentric control of the transport roll.

  For the detection roll, it is necessary to select an eccentric level and a diameter so that the eccentricity does not affect the detection accuracy. Since the influence of the eccentricity of the detection roll is substantially the same as the influence of the eccentricity of the transport roll, the description thereof will be omitted.

  Next, another embodiment of the position of the detection roll for detecting the eccentricity of the conveyance roll and the conveyance amount will be described. The feed roll 8 and the original fabric roll 51 in FIGS. 1 and 6 are configured to detect and control the eccentricity and the conveyance amount by the rotation of the pressing roll 7. However, in the delivery roll 12 and the take-up drum 52 in FIGS. 1 and 6, since the surface layer of the pressing roll 11 is an elastic layer roll, a measurement error occurs in the detection of the eccentricity and the transport amount by the pressing roll 11. To do. In FIG. 1, the sensor 14 for detecting the position of the surface of the delivery roll is provided, and the means for detecting the eccentricity of the delivery roll 12 from the position variation is disclosed, but as another method, the pressing roll is used as the detection roll. Alternatively, it is possible to detect the eccentricity of the transport roll and the transport amount by providing a detection roll at another position of the transport roll. However, since it is clear that there is a phase difference in the conveyance speed by the angle between the sheet feed position of the conveyance roll and the installation position of the detection roll, it is necessary to correct this. Further, as described above, it is important to determine the diameter of the detection roll from the eccentric level of the detection roll, the sheet stretch length, the target tension level, and the like.

  Next, it is about a guide plate. In the apparatus of the embodiment shown in FIG. 6 as well, the guide plate 18 incorporating the optical sensor 20 is arranged in the sheet stretch portion as in FIG. However, the apparatus of the embodiment of FIG. 6 is configured so that the guide plate 18 rotates around a rotationally movable portion 49 provided on the delivery side. This is because, in the apparatus of FIG. 6, the sheet path changes because the original diameter decreases as the sheet is wound from the original. In the apparatus of the embodiment shown in FIG. 6, the position of the pressing roll 7 on the surface of the original fabric roll is detected, and the guide plate 18 is tilted in conjunction therewith. As a result, the guide plate 18 can be held close to the sheet path even if the sheet path changes due to the reduction in the original fabric diameter due to winding, ensuring the function of the guide plate, such as preventing vibration of the stretch sheet and detecting abnormalities. It can be done.

  Further, when the sheet is wound from the original fabric and the original fabric diameter is reduced, the length of the sheet stretch is also changed. The change in the sheet stretch length affects the sheet tension. However, in the method of the present invention, the sheet tension can be basically controlled only by the difference in the sheet conveyance amount regardless of the sheet stretch length. For this reason, if the sheet stretch length does not change abruptly, the tension is almost stabilized at a specified tension. Since the change in the sheet stretch length due to the reduction in the original fabric diameter due to the winding of the original fabric is not so rapid, practically, the tension in the sheet stretch region is hardly affected.

  Next, the comparison with the embodiment of FIG. 1 will be described in the region other than the high-precision tension control section 1 in the winding device of the embodiment of FIG. In the winding device of the embodiment of FIG. 6, the upstream section of the high-precision tension control section that forms the wrinkle-free sheet surface is the original fabric surface, and almost no sheet tension is applied in this portion. It is equivalent to the no-tension or micro-tension control section 2 in the sheet area of FIG. Also, in the downstream section of the high-precision tension control section, the sheet is wound around the winding drum surface and no particular tension is applied, so this area also has no tension or very low tension on the downstream side in FIG. It is equivalent to control section 3. Further, the downstream process 6 includes winding on a small roll 53. The small roll 53 is configured to wind the sheet by being pressed and driven by the winding drum 52, and does not particularly apply tension to the sheet.

  In the embodiment of FIG. 1, the width direction travel position control means 4 is provided further upstream of the upstream no tension or micro tension control section 2. Also in the winding device of the embodiment of FIG. 6, since it is necessary to wind the sheet to the specified position of the small winding drum 53, it is necessary to control the sheet traveling position to an appropriate position. In the winding device of the embodiment of FIG. 6, the position of the original fabric is configured to be movable in the width direction. As a result, the position of unwinding from the original fabric can be adjusted, and the sheet winding to the specified position of the small roll is realized.

  Next, the acceleration / deceleration operation of the sheet conveyance speed will be described. Another major feature of the seat tension control according to the present invention is that the sheet tension in the seat stretch section does not change even during rapid acceleration / deceleration. In the conventional various methods described above, the inertial force generated in various members during the acceleration / deceleration operation affects the seat tension region, so that the tension variation occurs. However, in the method of the present invention, a contact member such as a roller is not brought into contact with the sheet stretching region, and the conveying means is also a conveyance amount control. As long as accurate conveyance amount control can be performed, the sheet acts as an inertial force. It will only be its own weight. From this, if the seat drive control system of the present invention is applied, the seat tension in the seat stretch section can be stably maintained even during rapid acceleration / deceleration.

  That is, in the method of the present invention, it is extremely important to control the sheet conveyance amount by the conveyance roll with high accuracy. In particular, during rapid deceleration, it is necessary to reduce the transport amount against the inertial force. For this reason, there is a tendency that the servo motor for driving the transport rolls is increased in size. As a method for solving this, it is effective to attach a brake means to a transport roll together with a drive motor such as a servo motor for transport amount control. By controlling the braking force in accordance with the deceleration operation, it is possible to reduce the influence of the inertial force on the drive motor for transport amount control. As the brake means, a system that can control the load in a non-contact manner is desirable in consideration of wear and controllability of the brake force. For example, by controlling the voltage and current of a torque motor having a relatively simple structure, it can be used as a brake in which the torque load and the rotational speed are controlled. Furthermore, by using the motor as a brake, regenerative braking can be realized, and effective use of energy during acceleration / deceleration is also effective. Of course, it is also effective to use a drive motor for transport amount control on the transport roll as a regenerative brake.

  Finally, another embodiment of the sheet winding apparatus using the sheet drive control system of the present invention will be briefly described. FIG. 8 is a view showing another embodiment of the sheet winding device. The apparatus of the embodiment of FIG. 8 is one in which two intermediate rollers 57 and 58 are arranged in the sheet stretch section of the apparatus of the embodiment of FIG. Along with this, the rotation direction of the original fabric 51 is reversed. As described above, the arrangement of the intermediate rollers 57 and 58 negatively affects the sheet tension controllability in the tension control section of the present invention. However, since the arrangement of such an intermediate roller also has some merits, the configuration of FIG. 8 is also shown as an embodiment of the winding device.

  First, by arranging the intermediate roller, the length of the sheet stretching section 1 is longer in the apparatus of FIG. 8 than in FIG. When the sheet stretch length of FIG. 8 is realized with the configuration of FIG. 6, a distance is required between the raw roll and the winding drum, and the apparatus size becomes large. Further, as described above, the longer the sheet stretch length, the less affected by the eccentricity of the transport roll.

  However, there is a problem that the longer the sheet stretch, the easier the vibration of the seat surface. In particular, when the seat tension is small, vibration with a larger amplitude tends to occur. Of course, it can be prevented by bringing the guide plate 18 and the like close to each other, but the arrangement of the intermediate rolls 57 and 58 is more effective.

  Further, the arrangement of the intermediate roll 57 can reduce the change in the sheet path due to the decrease in the diameter of the original fabric. In the apparatus of the embodiment of FIG. 8, the guide plate 18 is provided in the inclined sheet path region in the center of the figure, but this guide plate does not need to be operated as in the embodiment of FIG.

  However, as described above, the arrangement of the intermediate rolls and the like affects the sheet tension accuracy. In particular, in the case of a change over time or a rapid acceleration / deceleration, the influence becomes large.

  In order to reduce the influence as much as possible, it is necessary to reduce the tension load on the sheet in the stretch region. It is necessary to use a low frictional resistance surface material such as Teflon (registered trademark) or silicone, or to reduce the inertial force by lightening as much as possible. Also, intermediate rolls with a large winding angle should be avoided. In particular, when the winding angle exceeds 60 degrees, roll pressing with the same force as the tension occurs. When it is absolutely necessary to arrange the intermediate roll in a section requiring high-precision sheet tension control, in order to ensure the effect of the high-precision tension control of the present invention, the sheet winding angle around the intermediate roll is set to at least 60. It is desirable to make it below the degree.

  As described above, according to the present invention, it is possible to make the sheet tension value highly accurate by accurately controlling the extension amount of the sheet stretched in the sheet tension control section. Thereby, even in a low-rigidity sheet such as a thin plastic sheet, sheet handling without wrinkling can be realized, and various devices such as a high-speed and high-precision sheet winding device can be provided.

DESCRIPTION OF SYMBOLS 1 ... High precision tension control section 2 ... No tension or fine tension control section upstream of high precision tension control section 3 ... No tension or fine tension control section downstream of high precision tension control section 4・ ・ ・ Width direction travel position control section 5 ・ ・ ・ Upstream process 6 ・ ・ ・ Downstream process 7 ・ ・ ・ Pressing roll (rigid body roll) on the sheet feeding means side
8 ... Sheet feeding means (conveying means for feeding sheets into the tension control section) and sheet feeding roll on the sheet feeding means side 9 ... (Conveying roll) eccentric storage means 10 on the sheet feeding side Motor driving pattern control means 11 on the sheet feeding side ... Pressing roll (surface elastic roll) on the sheet feeding means side
12. Sheet feeding means (conveying means for sending sheets from the tension control section) and sheet conveying roll 13 on the sheet sending means side ... Motor driving pattern control means 14 on the sheet sending side ... Eccentricity on the sheet sending side Detection means (optical non-contact distance sensor, etc.)
DESCRIPTION OF SYMBOLS 15 ... Eccentric storage means 16 of sheet | seat delivery side ... High precision feed amount difference control means 17 ... Overall control system 18 of sheet handling apparatus ... (Proximity) guide plate of high precision tension control section sheet path 19 ・ ・ ・ Vibration preventing contact member (curved projection)
20 ... Optical sensor (Sheet behavior abnormality detection sensor)
21... Abnormality detection means (sensor signal processing means)
22 ... Sag amount detecting means 23 in the upstream non-tension section ... Sheet transport roll 24 in the upstream non-tension section ... Pressure roller 25 in the upstream non-tension section ... No upstream Tension section sag amount control means 26 ... downstream non-tension section pressure roll 27 ... downstream non-tension section sheet conveyance roll 28 ... downstream non-tension section sag detection means 29 ... Slack amount control means 30 in the downstream tension-free section ... Running position detection sensor 31 in the sheet width direction ... Sheet tension applying means (roll contact method, etc.)
32 ... Steering roll and its driving means 33 ... Sheet running position control means 34 ... Sheet member 35 being conveyed ... Sheet conveying direction 36 ... Initial sheet is slack in the tension control section State 37 ... Result when the sheet feeding speed is 0.5% faster than the sending speed 38 ... Result when the sheet feeding speed is 0.5% slower than the sending speed 39 ... Sheet feeding speed is 1.0 than the sending speed Result when% is late 40 ... Area where the sheet in the stretch section is slack (no tension)
41... Example of fluctuation in sheet conveyance speed of delivery roll 42... Example of fluctuation in sheet conveyance speed of feeding roll 43... Sheet conveyance motor 44 in upstream tension-free zone. Sheet conveyance motor 45 in the section ... feed-side sheet conveyance amount detection means (pressure roll rotation number detection)
46 ··· Feeding side transport roll drive motor (raw shaft drive motor)
47 ・ ・ ・ Delivery-side transport roll drive motor 48 ・ ・ ・ Pressing force 49 ・ ・ ・ Guide plate movable fulcrum 50 ・ ・ ・ Guide plate movable position image 51 after reduction of the original roll diameter Diameter ・ ・ ・ Original or original roll 52... Winding drum 53... Small roll 54 .. Sheet breaking point 55... Strain area 56. Strain area 57.
58 ・ ・ ・ Intermediate roller 2

Claims (23)

  In the driving device and the winding device for the ultra-thin sheet member, a plurality of conveying rollers for conveying the sheet and a plurality of rotation driving means capable of independently controlling the rotation angles of the plurality of conveying rollers are arranged, A plurality of rotation amount control means for calculating a rotation angle for controlling the sheet feed amount by each rotation drive means to a specified value, and controlling a sheet conveyance amount by each rotation drive means, and the plurality of rotation amount controls. A sheet conveyance amount difference control unit that provides sheet conveyance amount information to be conveyed to the unit, and the sheet conveyance amount difference control unit outputs a plurality of conveyance amount command signals having a predetermined conveyance amount difference by a conveyance command signal. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the thin film sheet drive control system, which are formed and control the plurality of rotational drive means. 2. The thin film sheet drive control system and apparatus according to claim 1, and a sheet winding apparatus using the same, wherein the sheet conveyance amount difference control means is a sheet in a sheet stretch section between conveyance rollers having adjacent rotation drive means. Control means for controlling the tension, the sheet conveyance length by the upstream rotational drive means in the sheet tension control section, which is the sheet stretch section to be tension controlled, is set as the rotation downstream of the sheet tension control section. The sheet feeding length is controlled to be always smaller than the sheet conveying length by the driving means, and the prescribed value of the difference between the sheet conveying length by the downstream rotational driving means and the sheet conveying length by the upstream rotational driving means is Thin film sheet drive control system and device, and a sheet using the same, which can be changed according to conditions such as the type of transport sheet and the surrounding environment. Winding device. 3. The thin film sheet drive control system and apparatus according to claim 2, and a sheet winding apparatus using the thin film sheet drive control system, wherein a contact angle of a contact member such as a non-drive control roller arranged in the sheet tension control section is set to a sheet winding angle. Thin film sheet drive control system and apparatus, and sheet winding apparatus using the same, characterized in that the angle is 60 degrees or less. 3. The thin film sheet drive control system and apparatus according to claim 2, and a sheet winding apparatus using the same, wherein the sheet tension in the sheet tension control section is not less than a specified value, or not more than a specified value, and at least one of fractures. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, comprising sheet tension abnormality detection means for detecting that the state has been reached. 3. The thin film sheet drive control method and apparatus according to claim 2, and a sheet winding apparatus using the thin film sheet drive control system and apparatus, wherein the sheet has a means for detecting a sagging of the sheet in the sheet tension control section, and the sheet is the tension control target. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the thin film sheet drive control system, characterized by having an initial tension setting mode for changing from a slack state to a specified tension state in a tension control section. 6. The thin film sheet drive control method and apparatus according to claim 5, and a sheet winding apparatus using the thin film sheet drive control system and apparatus, wherein the initial tension setting mode drives or drives only the upstream rotational drive means in the sheet tension control section. A sheet sagging removal operation for roughly removing the initial sheet slack by controlling the downstream rotational drive means so that the difference in the sheet transport length is larger than the difference in the sheet transport length for controlling the predetermined tension, In order to stabilize the sheet tension to the specified value after the sheet sagging is roughly removed, the tension for controlling the upstream and downstream rotary drive means in the sheet tension control section to be driven for a specified time with a predetermined conveyance amount difference. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, characterized by comprising a stabilized drive operation. 3. The thin film sheet drive control system and apparatus according to claim 2, and a sheet winding apparatus using the thin film sheet drive control system, comprising: a roll and a plate member close to a sheet tension path at a specified tension in the sheet tension control section. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, characterized in that a sheet path guide means is disposed. 8. The thin film sheet drive control system and apparatus according to claim 7, and a sheet winding apparatus using the same, wherein the sheet path guide means disposed in the sheet tension control section detects a change in the sheet path, and A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, comprising a movable mechanism that is movable so as to maintain a close proximity distance. 2. The thin film sheet drive control system and apparatus according to claim 1, and a sheet winding apparatus using the thin film sheet drive control system and apparatus, wherein at least one of the plurality of transport rollers arranged to transport the sheet is a rotation of the transport roller. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, comprising a rotation drive means capable of controlling the angle and a rotation deceleration brake means for reducing the rotation of the conveying roller. 10. The thin film sheet drive control system and apparatus according to claim 9, and the sheet winding apparatus using the thin film sheet drive control system, wherein the rotational deceleration brake means has variable brake strength and is one of rotational speed, deceleration speed, and deceleration acceleration. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, comprising brake strength control means for variably controlling brake strength using the above parameters. 10. The thin film sheet drive control system and apparatus according to claim 9, and the sheet winding apparatus using the thin film sheet drive control system, wherein the rotational deceleration brake means is a torque controllable motor such as an induction motor, and a motor in an unloaded state. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, wherein the braking force is controlled by controlling the rotational speed of the sheet to be slower than the target speed. 10. A thin film sheet drive control system and apparatus according to claim 9, and a sheet winding apparatus using the thin film sheet drive control system, wherein the rotational deceleration brake means is a regenerative brake means capable of recovering braking force as electric power. Sheet drive control system and apparatus, and sheet winding apparatus using the same. 2. The thin film sheet drive control system and apparatus according to claim 1, and a sheet winding apparatus using the thin film sheet driving apparatus, wherein at least one of a plurality of transport rollers arranged to transport the sheet enters the transport roller. A conveyance length detection unit that detects at least one of the sheet length to be discharged or the sheet length to be discharged, and the conveyance length by the conveyance length detection unit coincides with a designated value sequentially supported from the sheet conveyance amount difference control unit, A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, wherein the rotation amount control means of the transport roller sequentially calculates and controls the rotation angle of the rotation drive means. 13. The thin film sheet drive control system and apparatus according to claim 12, and a sheet winding apparatus using the thin film sheet drive control system, wherein the conveyance length detection means is a rigid roll that opposes the conveyance roller with a sheet member conveyed therebetween. Thin film sheet drive control system and apparatus and sheet winding apparatus using the same. 13. The thin film sheet drive control system and apparatus according to claim 12, and a sheet winding apparatus using the thin film sheet drive control system, wherein the conveyance length detection means is a rigid roll pressed against a region where the conveyance sheet member on the conveyance roller is not in contact. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same. 13. The thin film sheet drive control system and apparatus according to claim 12, and a sheet winding apparatus using the thin film sheet drive control system, wherein the transport length detecting means is a roll-shaped member that opposes the transport roller across the transported sheet member. And a roll pressing control means capable of controlling the pressing of the roll-shaped member to the conveying roller, and the roll pressing control means uses at least one of a sheet conveying speed and a sheet conveying acceleration to press the detection roll. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same. 13. The thin film sheet drive control system and apparatus according to claim 12, and a sheet winding apparatus using the thin film sheet drive control system, wherein the transport length detecting means is in a roll shape pressed against a region of the transport roller where the transport sheet member is not in contact. While having a roll pressing control means that is a member and capable of controlling the pressing of the roll member to the transport roller, the roll press control means uses at least one of a sheet transport speed and a sheet transport acceleration, A thin film sheet drive control system and apparatus characterized by controlling the pressing of a detection roll, and a sheet winding apparatus using the same. 13. The thin film sheet drive control system and apparatus according to claim 12, and a sheet winding apparatus using the thin film sheet drive control system, wherein the conveyance length detecting means is a roll-shaped member, and an outer peripheral length of the roll-shaped member is adjacent to the conveyance A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the thin film sheet drive control system, wherein the sheet tension section length for controlling the sheet tension between rollers is less than a fraction of the length. In the thin film sheet drive control system and apparatus according to claim 12, and a sheet winding apparatus using the thin film sheet drive control system, the sheet conveyance length detected by the conveyance length detection means and the rotational angle position of the conveyance roller are detected and stored. Conveyance roller eccentricity storage means for detecting and storing the eccentric pattern of the conveyance roller is provided, and the conveyance roller rotation amount control means corrects the rotation angle amount of the rotation driving means of the conveyance roller according to the information of the conveyance roller eccentricity storage means. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same. 13. The thin film sheet drive control system and apparatus according to claim 12, and a sheet winding apparatus using the thin film sheet drive control system, wherein the transport length detecting means is a roll-shaped member, and rotational eccentricity of the transport length detecting means made of the roll-shaped member is detected. And a detection roller eccentricity storage unit for storing, and the conveyance roller rotation amount control unit corrects and controls the rotation angle amount of the rotation driving unit of the conveyance roller using information of the detection roll eccentricity storage unit. Thin film sheet drive control system and apparatus, and sheet winding apparatus using the same. 2. The thin film sheet drive control system and apparatus according to claim 1, and a sheet winding apparatus using the thin film sheet drive control system and apparatus, wherein the most upstream conveyance roller among the plurality of conveyance rollers for conveying the sheet drives to unwind the sheet. A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, characterized in that it is a raw roll supplied. 21. The thin film sheet drive control system and apparatus according to claim 20, and a sheet winding device using the same, in order to control the sheet travel position, the travel position in the width direction of the sheet is set at any position in the sheet travel area. A sheet travel position detecting means for detecting, and a raw roll position changing means capable of changing the position of the original roll in the rotational axis direction to drive and supply the sheet, and the detection result of the sheet travel position detecting means A thin film sheet drive control system and apparatus, and a sheet winding apparatus using the same, characterized by controlling the raw roll position changing means. The driving device and the winding device for the ultra-thin sheet member have a sheet tension control section for controlling the sheet tension in a specific section, and zero sheet tension is provided at least upstream or downstream of the sheet tension control section. Alternatively, a non-tension control section for controlling the tension to be sufficiently smaller than the sheet tension control section is disposed, and a travel position for controlling the travel position in the width direction of the sheet on the upstream side of the seat tension control section and the non-tension control section A thin film sheet drive control system and apparatus characterized by comprising a control section, and a sheet winding apparatus using the same.

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