JP3767145B2 - Eccentric state detection device for raw roll and raw material unwinding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention detects an eccentric state of an original roll in an original unwinding apparatus that unwinds the belt-like sheet from an original roll formed by winding a belt-like sheet of plastic film, paper or the like around a core. The present invention relates to a device for detecting an eccentric state of a material roll and a material unwinding device including the device.
[0002]
[Prior art]
Conventionally, in an original unwinding device that unwinds a belt-like sheet from an original roll that is eccentric with respect to the core, between the original roll and a driven feed roller that feeds the belt-like sheet unwound from the original roll. A dancer roller is provided on the arm, and the dancer roller is supported by an arm that can swing around a fulcrum, and an air cylinder for applying a tension by pressing the dancer roller against the belt-like sheet is connected to the arm. The air cylinder is supported by the frame, the drive mechanism is connected to the frame, the winding diameter is detected by an ultrasonic sensor, the eccentric amount of the original roll is read by the control device based on the detected winding diameter, By predicting and calculating a change pattern of the unwinding amount of the belt-like sheet accompanying the eccentric amount of the belt, and performing program control on the driving device based on the change pattern, There are those to move the roller.
[0003]
[Problems to be solved by the invention]
However, in the above-described raw material unwinding device, a part of the raw material roll is directly detected by an ultrasonic sensor to detect the radius, and the eccentricity is read based on the detected radius. Under the influence of deformation due to its own weight, wrinkles (unevenness) and the like, the roll roll radius cannot be detected accurately, and it cannot be said to be sufficient for suppressing fluctuations in the tension of the rewound belt-like sheet.
[0004]
For example, in the case where the belt-like sheet is a stretched film, the belt-like sheet is usually formed into a required thickness with a certain width by a film-forming machine, and then wound up with a low tension to be a raw roll. . And this original fabric roll is aged for a fixed period, and decenters with dead weight in the meantime. However, strictly speaking, the stretched film has a tendency that the thickness of both edges tends to be thicker than the other parts, and the raw roll formed by winding it is hard at both ends, and between the winding layers in the central part. Contains a lot of air, and the part becomes soft, so the center part of the roll is more eccentric than the edges. Then, as illustrated in FIG. 7, the raw roll 1 is in a state where the central portion is bent downward, and wrinkles (unevenness in the sheet width direction) are likely to occur irregularly on the outer periphery of the central portion. In such an original fabric roll, when it is rotated, the soft intermediate portion is continuously bent downward by its own weight, and the original fabric roll is deformed in a complicated manner during the rotation. Even if the original fabric roll 1 deformed as shown by the solid line in FIG. 7 rotates halfway around the core C, it does not appear as shown by the two-dot chain line, but deforms as shown by the one-dot chain line, for example. Therefore, when using an ultrasonic sensor that directly detects the roll of the roll in order to detect the winding diameter from moment to moment, it is affected by the deflection of the roll and the wrinkle during unwinding. The detection of the eccentric state becomes inaccurate.
[0005]
Accordingly, the present invention provides an original roll unwinding device in which the roll core is rotated by a motor to rewind the belt-like sheet, and the unrolled belt-like sheet is fed by a feed roller. An object of the present invention is to make it possible to accurately detect the eccentric state of the original fabric roll even if the original fabric roll bends during rewinding or wrinkles occur on the outer peripheral surface thereof. Another object of the present invention is to feed the belt-like sheet that has been rewound with sufficiently small fluctuations in tension.
[0006]
[Means for Solving the Problems]
In the present invention, the roll core of the raw roll is held by a chuck, and the roll core is rotated by a rewinding motor to rewind the belt-like sheet, and the web roll is fed out by the feed roller. In the apparatus, based on the current supplied to the rewinding motor detected every moment by the current detecting device and the rotation angle of the original fabric roll detected every moment by the rotation angle detecting device, the original fabric roll is The difference between the maximum value and the minimum value of the current during the rotation is calculated by the current fluctuation width calculation means, and the eccentricity of the original roll is determined based on the detected current and the detected rotation angle of the original roll. the direction of the phase every moment is calculated by the phase calculating means further delivery belt-like sheet delivery detection value of the velocity detected by the speed detection device, and the rotation of the bulk roll detected by the rotational speed detecting means Or based on the detected value of the cumulative number of rotations of the roll, the thickness of the belt-like sheet and the value of the winding diameter at the start of unwinding, or from the start of unwinding until the roll diameter to be detected is reached. Based on the detection value of the feeding length of the belt-like sheet, the thickness of the belt-like sheet, and the value of the winding diameter at the start of the belt-like sheet unwinding, the average winding diameter in one rotation of the raw roll is calculated every time by the winding diameter computing means. , the average winding diameter in one rotation of the master roll that is constantly calculated by the reel diameter calculation means, and the eccentricity of the master roll based on a difference between the maximum value and the minimum value of the current computed by the current variation width calculating means The amount is calculated momentarily by an eccentricity amount calculating means.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0008]
In FIG. 1, the raw fabric unwinding apparatus holds both ends of a core C with a chuck (not shown), and drives the core C with a rewinding motor M1 to rotate the web roll 1 to wind the belt-like sheet S. While returning, the belt-like sheet S is sent out by a feed roller 2 that is rotationally driven by a motor M2. The original fabric roll 1 is eccentric with respect to the winding core C, that is, the rotation center Oa, and the belt-like sheet S rewound from the original fabric roll 1 has the guide roller 3, the compensation roller 4, the dancer roller 5, and the guide roller 6. In order, the feed roller 2 is reached.
[0009]
The motor M2 is controlled by the speed control device C2 based on the set speed, and the rewinding motor M1 is controlled by the known speed control device C1 and the average rewinding speed of the belt-like sheet S during one rotation of the original roll 1; The speed is controlled so that the belt-like sheet feed speed by the feed roller 2 is the same. In this embodiment, in the rewinding speed control device C1, the rotational speed command value is corrected so that the displacement of the dancer roller 5 is maintained within a certain range based on the detection signal from the displacement detection device 5a of the dancer roller 5. The
[0010]
The compensation roller 4 is attached to one end of a swing arm 7 that can swing around a fulcrum O1, and can reciprocate in a direction to increase or decrease the travel path length of the belt-like sheet S.
[0011]
The original roll unwinding device includes an original roll roll eccentric state detecting device 8 for detecting the eccentric state of the original roll 1 and a movement for reciprocating the compensating roller 4 by driving the swing arm 7 to swing. On the basis of the output signal from the mechanism 9 and the eccentric state detector 8 of the original roll, a control device 10 that controls the moving mechanism 9 so as to absorb the difference in the belt-like sheet unwinding speed during one rotation of the original roll 1. And are prepared.
[0012]
The eccentric state detection device 8 and the control device 10 use a small computer as hardware. The eccentric state detector 8 of the original roll detects the current supplied to the rewinding motor M1 detected by the current detector 11 every moment and the rotation angle of the original roll 1 detected every moment by the rotation angle detector 12. Based on the above, the difference between the maximum value and the minimum value of the current during one revolution of the original roll 1 is calculated every time by the current fluctuation width calculating means 13, and the current detected by the current detection device 11 and the rotation angle are detected. Based on the rotation angle of the original roll detected by the apparatus 12, the phase in the eccentric direction of the original roll 1 is calculated by the phase calculation means 14, and the rotation of the original roll 1 calculated by the winding diameter calculation means 15 is calculated. The eccentric amount of the raw fabric roll 1 is calculated momentarily by the eccentric amount calculating means 16 based on the average winding diameter at the current and the difference between the maximum value and the minimum value of the current calculated by the current fluctuation width calculating means 13. And outputs a phase signal of the eccentricity and the eccentric angle and to the control device 10.
[0013]
In this embodiment, the rotation angle detection device 12 detects the rotation angle of the original roll 1 by detecting the rotation angle of the output shaft of the rewinding motor M1. FIG. 1 shows the raw roll 1 when the detected value of the rotation angle is 0 degree, and the detected value of the rotation angle is the detected value of the rotation angle from the reference line L. The eccentric amount of the original roll 1 is the distance e from the rotation center Oa to the center of gravity O of the cross section of the original roll 1, and the phase in the eccentric direction is the center of gravity of the cross section of the original roll 1 from the rotation center Oa. This is an angle α between the straight line extending to O and the reference line L.
[0014]
The winding diameter calculating means 15 is based on the detected value V of the feeding speed of the belt-like sheet S detected by the feeding speed detecting device 17 and the detected value n of the rotational speed of the original roll 1 detected by the rotational speed detecting means 18. The average winding diameter R is calculated momentarily according to the equation R = V / (2πn).
[0015]
In the illustrated unwinding apparatus, when the unwinding roll 1 is rotated by the unwinding motor M1, since the unwinding roll 1 is eccentric, the torque of the unwinding motor M1 changes while it rotates once. The current changes accordingly. A relationship as shown in FIG. 2 exists between the current I supplied to the rewinding motor M1 and the torque τ of the rewinding motor M1. FIG. 3 is a diagram showing the relationship between the current I supplied to the rewinding motor M1 and the rotation angle θ of the original roll 1 while the original roll 1 makes one rotation. In FIG. The current when the phase in the eccentric direction of the anti-roll is 0 degree, and the solid line indicate the detected current. When the current is detected as indicated by the solid line in FIG. 3, the phase of the eccentric direction of the original roll is the original value when the detected value I of the current momentarily reaches the maximum value Imax during one revolution of the original roll. It becomes the anti-roll rotation angle. 1 stores the maximum value Imax and the minimum value Imin of the detected current value I while the detected value θ of the rotation angle in FIG. 3 changes from 0 degrees to 360 degrees. The difference ΔI is calculated. Further, the phase calculation means 14 makes a pair of the maximum value Imax of the current detection values I while the detection value θ of the rotation angle is 0 degrees to 360 degrees and the detection value θ1 of the rotation angle at that time. The rotation angle detection value θ1 when the current is the maximum value Imax is detected as the phase in the eccentric direction. In the case of the diagram shown in FIG. 3, the phase in the eccentric direction is delayed by the rotation angle θ1 with respect to the rotation of the rewinding motor M1. That is, it advances by the rotation angle α.
[0016]
When the widths of the rolls to be mounted on the roll unwinding device are the same between the rolls, the average roll diameters in one rotation of multiple rolls with different eccentricity are the same. There is a relationship as shown in the diagram of FIG. 4 between the difference ΔI between the maximum value and the minimum value of the current during one rotation of the original roll and the eccentric amount e of the original roll. When the difference ΔI between the maximum value and the minimum value of the current during one rotation of the original roll 1 is used as a parameter, the average roll diameter R of the original roll 1 and the eccentric amount e of the original roll 1 are between There is a relationship as shown in the diagram of FIG. The parameter values ΔIa, ΔIb, ΔIc in FIG. 5 have a relationship of ΔIa <ΔIb <ΔIc. Therefore, the eccentric amount calculating means 16 in FIG. 1 uses the difference ΔI between the maximum value and the minimum value of the current during one rotation of the original roll 1 and the average winding diameter R of the original roll, and the eccentric amount e of the original roll. 4 is given based on the relationship between the eccentricity e, the difference ΔI between the maximum and minimum current values, and the average winding diameter R shown in FIGS.
[0017]
In FIG. 1, the moving mechanism 9 includes a reciprocating mechanism 19 that changes the rotational movement of the input shaft 19 a to the reciprocating movement of the compensation roller 4, and a displacement width change that can expand and reduce the displacement width of the compensation roller 4 by the reciprocating mechanism 19. It comprises a mechanism 20 and a rotational drive mechanism 21 that rotationally drives the input shaft 19a so as to adjust the phase.
[0018]
The reciprocating mechanism 19 includes a cam 22 that engages with the swing arm 7, and the swing arm 7 swings as the cam 22 rotates. The rotational drive mechanism 21 includes a servo motor M3 for rotationally driving the cam 22, and the cam 22 and the servo motor M3 are provided on the movable frame 23.
[0019]
FIG. 6 is necessary to absorb the difference in the unwinding speed that occurs during one rotation of the web roll 1 when the belt-like sheet S is rewound from the roll 1 having the eccentricity e shown in FIG. 2 is a diagram showing the relationship between the displacement amount h of the compensation roller 4 and the current I of the rewinding motor M1 shown in FIG. 1 and the rotation angle θ of the original roll. A diagram of the required displacement h of the compensation roller with respect to the rotation angle θ of the original roll can be obtained geometrically for each average winding diameter of the original roll, and the displacement h is approximately equal to the eccentricity e. Proportional. The cam 22 of FIG. 1 determines a displacement diagram of the compensation roller 4 with respect to its rotation over the entire circumference based on the diagram of the displacement amount h of the compensation roller shown in FIG. 6, and is formed into a disk shape based on the displacement diagram. Form. In FIG. 6, the phase β of the displacement amount h is an angle β formed by a straight line from the rotation center Oa shown in FIG. 1 toward the belt-shaped sheet unwinding start point P on the outer periphery of the raw roll 1 and the reference line L. , Geometrically determined according to the average winding diameter R. In the diagram of FIG. 6, the phase β of the displacement h of the compensation roller is delayed by α−β with respect to the phase α of the original roll 1 in the eccentric direction.
[0020]
The displacement width changing mechanism 20 includes a screw rod 24 screwed to the movable frame 23 and a servo motor M4 that rotationally drives the screw rod 24, and can change the engagement position between the cam 22 and the swing arm 7. it can.
[0021]
The control device 10 includes a control unit 25 of the displacement width changing mechanism 20 and a control unit 26 of the rotation drive mechanism 21. The control unit 25 calculates the necessary displacement amount of the compensation roller 4 based on the calculated value of the eccentric amount from the eccentric amount calculation unit 16, and generates the necessary displacement amount with the cam 22 and the swing arm 7. The servo motor M4 is controlled so as to attach the cam 22 to the engagement position.
[0022]
The control means 26 is adapted to be able to correct the angle β in accordance with the average winding diameter calculation value R, and to change the corrected angle β and the detected value α of the eccentric direction phase by the eccentricity phase calculation means 14. Based on the detected value θ of the rotation angle of the original roll by the rotation angle detector 12, the rotation angle of the original roll is calculated. The input shaft 19a of the cam 22 rotates at the same speed as the original fabric roll following the change in the servo motor M3 so that the calculated phase shift α-β occurs between the cam 22 and the original fabric roll 1. Control the rotation. When the guide roller 3 is sufficiently separated from the original roll 1, the angle β is approximately constant, so that the rotation of the cam 22 and the original roll are corrected without correcting the phase of the displacement amount of the compensation roller 4. The phase shift α-β may be calculated in the displacement direction.
[0023]
According to the present invention, the winding diameter calculation means is not limited to the above-described one as long as the average roll diameter of the original roll is obtained by calculation without directly detecting the original roll with a sensor. Based on the detected value of the total number of rotations of the roll roll from the start until the roll diameter to be detected, the thickness of the belt-like sheet and the value of the winding diameter at the start of unwinding, or from the start of unwinding. Based on the detection value of the feeding length by the feeding roller of the belt-like sheet until the roll diameter is set, the thickness of the belt-like sheet and the value of the winding diameter at the start of unwinding, the roll diameter of the raw roll is calculated, It is also possible to detect the accumulated number of rotations of the original roll and the feeding length of the belt-like sheet, and calculate the thickness based on the detected number. Such a winding diameter calculating means is disclosed in, for example, Japanese Examined Patent Publication No. 61-2161, and will not be described in detail. Further, the average winding diameter is calculated using the rotation speed command value to the motor M1 and the rotation speed command value to the motor M2 instead of the detection value of the rotation speed of the raw roll and the detection value of the belt-like sheet traveling speed. It may be a thing.
[0024]
The reciprocating mechanism is not limited to the above-described one. For example, instead of the servo motor M3 shown in FIG. 1, a known phase adjusting mechanism, such as a harmonic drive, is provided between the rewinding motor M1 and the cam 22 as a differential gear. Incorporated into the mechanism and provided with a configuration that can change the phase of the input shaft and output shaft by rotating the wave generator of the harmonic drive with the phase adjustment motor, and through this phase adjustment mechanism, the rewinding motor The cam 22 may be driven to rotate by M1. In that case, the control means 25 of the rotational drive mechanism 21 controls the phase adjusting mechanism based on the phase in the eccentric direction detected by the phase calculation means 14 in the eccentric direction, so that the phases of the raw roll 1 and the cam 22 are the same. To do. The reciprocating mechanism may be a reciprocating slider crank mechanism that can change the length of the crank arm instead of the cam 22 as necessary.
[0025]
【The invention's effect】
In the apparatus for detecting the eccentricity of the original roll according to the present invention, the current supplied to the motor that rotationally drives the core of the original roll and the detected value of the rotation angle of the original roll each time, the average of the original roll Based on the calculated value of the winding diameter, the eccentric amount of the raw roll and the phase in the eccentric direction are calculated, so even if the raw roll is bent during rewinding or wrinkles are generated on its outer peripheral surface, The eccentric state of the raw roll can be accurately detected without being affected by it.
[0026]
Moreover, according to the raw fabric unwinding apparatus of the present invention, the raw fabric roll can be sent out in a state in which the fluctuation in the tension of the belt-like sheet is sufficiently suppressed, and the feeding speed can be increased.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an original unwinding apparatus provided with an eccentric state detection apparatus for an original roll according to the present invention.
FIG. 2 is a current-torque characteristic diagram of the rewinding motor shown in FIG.
FIG. 3 is a diagram showing the relationship between the current of the rewinding motor and the rotation angle of the original roll.
FIG. 4 is a diagram showing the relationship between the difference between the maximum value and the minimum value of current during one rotation of the original roll and the eccentric amount of the original roll.
FIG. 5 is a diagram showing the relationship between the average winding diameter of the original roll and the eccentric amount of the original roll, using the difference between the maximum value and the minimum value of the current during one rotation of the original roll as a parameter. .
FIG. 6 is a diagram showing the relationship between the rotation angle of the original roll and the required displacement amount of the compensation roller.
FIG. 7 is an explanatory view exaggeratingly showing a deformed state of the original roll during rewinding.
[Explanation of symbols]
S belt-like sheet C winding core M1 rewinding motor M2 motor M3 servo motor M4 servo motor 1 original fabric roll 2 feeding roller 3 dancer roller 4 compensation roller 5 swinging arm 9 moving mechanism 8 eccentricity detection device 10 of original fabric roll DESCRIPTION OF SYMBOLS 11 Current detection apparatus 12 Rotation angle detection apparatus 13 Current fluctuation range calculation means 14 Eccentric direction phase calculation means 15 Reel diameter calculation means 16 Eccentric amount calculation means 17 Feeding speed detection apparatus 18 Rotation speed detection apparatus 19 Reciprocating motion mechanism 20 Displacement width change Mechanism 21 Synchronous drive mechanism 22 Cam 23 Movable frame 24 Screw rod

Claims (2)

In the original unwinding device that holds the roll core of the original roll with a chuck, rotates the roll core with a rewinding motor to rewind the belt-like sheet, and feeds the unwound belt-like sheet with a feed roller. Based on the current supplied to the rewinding motor detected every moment by the detecting device and the rotation angle of the original fabric roll detected every moment by the rotation angle detecting device, the original fabric roll is rotated once. The difference between the maximum value and the minimum value of the current is calculated every time by the current fluctuation width calculation means, and the phase of the eccentric direction of the original roll is determined based on the detected current and the detected rotation angle of the original roll. every moment is calculated by the phase calculating means, based on the further delivery belt-like sheet delivery detection value of the velocity detected by the speed detector, and the rotational speed of the master roll detected by the rotational speed detecting means Alternatively, based on the detected value of the cumulative number of rotations of the roll, the thickness of the belt-like sheet and the value of the winding diameter at the start of unwinding, or from the start of unwinding until the roll diameter to be detected is reached. Based on the detected value of the feeding length, the thickness of the belt-like sheet, and the value of the winding diameter at the start of the belt-like sheet unwinding, the average winding diameter in one rotation of the raw roll is calculated every time by the winding diameter calculating means, and the winding The eccentric amount of the original roll is eccentric based on the average winding diameter in one rotation of the original roll calculated by the diameter calculating means and the difference between the maximum value and the minimum value of the current calculated by the current fluctuation width calculating means. An eccentric state detection apparatus for an original roll, characterized in that it is calculated momentarily by a quantity calculating means.   In the original fabric unwinding device that unwinds the belt-like sheet by rotationally driving the roll core of the original fabric roll with a rewinding motor, and feeds the unwound belt-like sheet with a feed roller, between the original fabric roll and the feed roller A compensation roller provided so as to be capable of reciprocating in a direction in which the travel path length of the belt-like sheet increases or decreases between them, a moving mechanism of the compensation roller, an eccentric state detecting device for the original fabric roll according to claim 1, and the original fabric A raw material unwinding device comprising: a control device that controls the moving mechanism based on an eccentric amount calculated by a roll eccentricity detecting device and a phase in an eccentric direction.

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