JP2012236676A - Device of correcting winding deviation of film and method of correcting winding deviation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately maintain the accuracy of the winding deviation of a film by minimizing undesirable stress acting on the film in the process of correcting the winding deviation of the film while decreasing the risk of breaking film.SOLUTION: A first side-edge position detection sensor 7 is disposed in a changing section X where the position of the side edge of the glass film G changes in the longitudinal direction thereof, and a second side-edge position detection sensor 8 is disposed in an unchanging section Y where the position of the side edge of the glass film G does not substantially change in the longitudinal direction. The standard position of the first side-edge position detection sensor 7 is corrected by a standard-position correction member 9a of a controller 9 according to the amount of deviation between the standard position and the position of the side edge detected by the second side-edge position detection sensor 8. The position of the unwinding mechanism 2 in the width direction thereof is corrected by a winding-deviation correction member 9b of the controller 9 according to the amount of deviation between the position of the side edge detected by the first side-edge position detection sensor 7 and the standard position corrected by the standard-position correction member 9a.

Description

  The present invention relates to a technique for correcting winding deviation of various films such as a glass film.

  As is well known, a flat panel display (FPD) represented by a liquid crystal display, a plasma display, an organic EL display and the like has become the mainstream in recent years. Since the weight reduction of these FPDs is promoted, the glass substrates used for the FPDs are being made thinner.

  In addition, organic EL is being used as a flat light source such as a light source for indoor lighting by causing only three colors (for example, white) to emit light without causing the three primary colors to be flickered by a TFT unlike a display. The organic EL lighting device can freely deform the light emitting surface if the glass substrate has flexibility. Therefore, even in a glass substrate used in this type of lighting device, a significant reduction in thickness is being promoted from the viewpoint of ensuring sufficient flexibility.

  In response to such a request for thinning, a glass film that has been thinned to a film shape (for example, a thickness of 300 μm or less) has been developed. Since this glass film has moderate flexibility, it may be accommodated in a state of a glass film roll wound up in a roll shape around the core (see, for example, Patent Document 1). In this way, a roll-to-roll device can continuously perform various processes such as cutting and film formation on the glass film unwound from the upstream glass film roll. It becomes possible, and production efficiency can be greatly improved.

  However, in the state of the glass film roll wound up in a roll shape, winding deviation may occur in the glass film. In particular, when a glass film roll is manufactured by directly winding a glass film to be formed, this winding deviation becomes significant. This is due to the following reason. That is, the glass film is generally formed into a thin plate by a down draw method such as an overflow down draw method or a slot down draw method. Therefore, if too much tension is applied when winding the glass film (for example, about 100 N with respect to a glass film having a width of 1 m), an excessive tensile force (tension) acts on the softened glass film near the molded body. However, a fatal problem that the glass film becomes thinner than a desired thickness or in some cases tears arises. Therefore, when a glass film roll is manufactured by directly winding a glass film to be formed, it is practically difficult to wind the glass film with sufficient tension, and the glass film wound as described above is used. This is a factor that causes winding misalignment.

  Then, when the glass film is unwound from the glass film roll with a roll-to-roll apparatus or the like and subjected to a predetermined treatment in a state where the glass film is wound in this manner, various problems occur. Specifically, when cutting the unwound glass film into a predetermined width dimension, the unwound glass film meanders in the width direction due to winding misalignment, so it cannot be cut on a straight line, Cutting failure such as cracking may occur. Also, when forming a film on the surface of the glass film, if wrinkles due to meandering occur on the surface of the unrolled glass film, a uniform film cannot be formed and a film formation failure occurs. obtain.

  Such a problem can also occur in a film (web) other than a glass film such as a resin film or paper. That is, various treatments may be applied to resin films and the like, and if the film unwound due to winding deviation meanders, such as defective cutting of the film and defective printing on the surface of the film (for example, printing deviation). Processing failure may occur.

  Therefore, in order to eliminate such problems, it is necessary to correct film misalignment before continuously processing various films including glass films with a roll-to-roll apparatus or the like. . Therefore, although not related to a glass film, various countermeasures for correcting the winding deviation of the film have been proposed for resin films and the like.

  Specifically, as a conventional film misalignment correcting device, as shown in FIG. 6, the side edge position detection sensor 13 detects the side edge position of the film W unwound from the film roll 11 by the unwinding mechanism 12. In addition to the detection, the control unit 14 winds based on the amount of displacement in the width direction between the detected side edge position of the film W and the reference position (position of the side edge when the glass film G is not wound). A configuration in which the unwinding mechanism 12 is moved in the width direction (the direction of arrow A in the drawing) to correct the winding deviation of the film W is generally used (see, for example, Patent Document 2).

  And the film W unwound by the unwinding mechanism 2 is set as the structure conveyed downstream by the some roller group 15 arrange | positioned at intervals. The roller group 15 has a width direction movable roller 15a that follows the movement in the width direction of the unwinding mechanism 2 on the upstream side, and a width direction non-movable roller 15b that does not follow the movement in the width direction of the unwinding mechanism 12 on the downstream side. Have. Note that a plurality of width direction non-movable rollers 15b are arranged outside the figure.

JP 2010-132350 A Japanese Patent Publication No. 6-57580

  By the way, after the film W unwound by the unwinding mechanism 12 comes into contact with the first (most upstream) width-direction non-movable roller 15b, the direction perpendicular to the rotation axis of the width-direction non-movable roller 15b (in the drawing) It is easy to go straight in the direction of arrow B). Therefore, when the unwinding mechanism 12 is moved in the width direction to correct the winding shift of the film W, the winding shift of the film W is corrected mainly in the upstream region of the first non-movable roller 15b in the width direction. In other words, with the first width direction non-movable roller 15b as a boundary, the upstream side is a change region X in which the side edge position of the film W changes along the longitudinal direction, and the downstream side is the side edge position of the film W in the longitudinal direction. A non-change region Y that does not substantially change along the line is defined. Therefore, from the viewpoint of accurately correcting the winding deviation of the film W, it is necessary to determine the arrangement position of the side edge position detection sensor 13 in consideration of the change area X and the non-change area Y of the film W.

  However, Patent Document 2 does not disclose at all how to set the arrangement position of the side edge position detection means (web edge position detector) in the longitudinal direction of the film.

  Therefore, as shown in FIG. 6, it may be possible to arrange the side edge position detection sensor 13 in the non-change region Y of the film W, but in this case, the following problem may occur. That is, in this case, since the separation distance between the side edge position detection sensor 13 and the unwinding mechanism 12 becomes large, the side edge position of the film W corrected by the unwinding mechanism 2 is detected by the side edge position detection sensor 13. It takes time to reach the area and reflect the correction results. As a result, if the unwinding mechanism 12 is continuously moved to the opposite side of the film W displacement direction based on the detection result of the side edge position detection sensor 13, a correction amount (movement) necessary to correct the actual winding displacement. The unwinding mechanism 12 moves in the width direction more than the amount), and the correction accuracy of winding misalignment is deteriorated, and the film W may be excessively twisted in the change region X. For this reason, a large stress acts on the film W, and in some cases, the film W is damaged.

  Such a problem is caused by a large separation distance between the side edge position detection sensor 13 and the unwinding mechanism 12, and therefore, if the side edge position detection sensor 13 is brought close to the unwinding mechanism 12. This problem can be solved.

  However, if the side edge position detection sensor 13 is to be brought closer to the unwinding mechanism 12, the side edge position detection sensor 13 needs to be arranged in the change region X of the film W as shown in FIG. However, in this case, the side edge position of the film W may further fluctuate in the change region X located on the downstream side of the detection area of the side edge position detection sensor 13, and the winding deviation correction accuracy of the film W is reduced. Problems may occur.

  In view of the above circumstances, the present invention minimizes the undue stress acting on the film at the time of correcting the film winding deviation, and maintains the film winding precision with high accuracy while reducing the damage to the film. This is a technical issue.

  An apparatus according to the present invention, which was created to solve the above problems, includes an unwinding means for unwinding a film from a film roll, and a side edge position for detecting a side edge position of the film unwound by the unwinding means Detection means, and control means for correcting the width direction position of the unwinding means based on the amount of deviation in the width direction between the side edge position detected by the side edge position detection means and a reference position, When correcting the position in the width direction of the unwinding means by the control means, the change region where the side edge position of the film changes along the longitudinal direction in order from the upstream side in the longitudinal direction of the film, and the side of the film An apparatus for correcting winding misalignment of a film in which a non-change region in which an edge position does not substantially change along a longitudinal direction is formed, wherein the side edge position detecting means is a first side edge disposed in the change region. A position detecting means; A second side edge position detecting means disposed in the region, wherein the control means is configured to determine a side edge position detected by the second side edge position detecting means and a reference position of the second side edge position detecting means. A reference position correction unit that corrects a reference position of the first side edge position detection unit based on a shift amount in a width direction therebetween, a side edge position detected by the first side edge position detection unit, and the reference position correction And a winding misalignment correcting section that corrects the position in the width direction of the unwinding means based on the amount of misalignment in the width direction with respect to the reference position of the first side edge position detecting means corrected by the section. .

  According to such a configuration, the first side edge arranged in the change area of the film based on the amount of deviation of the side edge position detected by the second side edge position detection means arranged in the non-change area of the film. The reference position of the position detection means is corrected. And the width direction position of the unwinding means based on the amount of deviation in the width direction between the side edge position detected by the first side edge position detecting means and the corrected reference position of the first side edge position detecting means. Is fixed. Therefore, even if the position in the width direction of the unwinding means is corrected by the first side edge position detecting means arranged in the change area of the film, the reference position of the first side edge position detecting means is arranged in the non-change area of the film. This reflects the detection result of the second side edge position detecting means, so that the side edge position of the film does not change greatly on the downstream side of the first side edge position detecting means, and the winding deviation of the film is prevented. A situation in which the correction accuracy is lowered can be reliably prevented. In addition, since the change region of the film is formed in the vicinity of the unwinding means, the correction result in the width direction of the unwinding means is immediately reflected in the detection result of the first side edge position detecting means. For this reason, the ratio that the correction amount (movement amount) of the position in the width direction of the unwinding means exceeds the correction amount (movement amount) necessary to correct the actual winding deviation is extremely small, and unreasonable stress is applied to the film. It becomes difficult to act.

  In the above configuration, the film is preferably a glass film having a thickness of 300 μm or less.

  That is, with such a glass film, if an unreasonable twist or the like occurs at the time of winding misalignment correction, there is a high possibility that the glass film will be damaged by the stress acting at that time. Therefore, the advantage of the present invention that can prevent a situation in which an unreasonable stress acts on the film can be exhibited to the maximum.

  The method according to the present invention devised to solve the above-mentioned problem is to detect the side edge position of the film in the side edge position detection area while unwinding the film from the film roll by the unwinding means, and to detect the detected side. When correcting the width direction position of the unwinding means based on the amount of deviation in the width direction between the edge position and the reference position, and when correcting the width direction position of the unwinding means, Correction of winding misalignment of the film in which a change area where the side edge position of the film changes along the longitudinal direction and a non-change area where the side edge position of the film does not change along the longitudinal direction are formed in order from the upstream side. In the method, as the side edge position detection area, a first side edge position detection area is provided in the change area, a second side edge position detection area is provided in the non-change area, and the second side edge position detection is performed. Eli The reference position of the first side edge position detection area is corrected while correcting the reference position of the first side edge position detection area on the basis of the amount of deviation in the width direction between the side edge position detected in Step 2 and the reference position of the second side edge position detection means. The width direction position of the unwinding means is corrected based on the amount of shift in the width direction between the reference position and the side edge position detected in the first side edge position detection area.

  According to such a method, it is possible to receive the same operational effects as the corresponding configuration already described.

  As described above, according to the present invention, the shift amount in the side edge position detection area of the film change region is corrected based on the shift amount in the side edge position detection area of the non-change region of the film. Accordingly, since it is possible to detect the shift amount in consideration of the state of the non-change region of the film in the change region of the film, the winding shift of the film can be corrected with high accuracy.

  Moreover, since the correction result of the unwinding means is immediately reflected in the side edge position detection area of the change area of the film, it is possible to prevent a situation in which the unwinding means moves excessively with respect to the necessary movement amount. . Therefore, in the change area | region of a film, it is hard to produce malfunctions, such as a film twisting excessively, and the situation where an unreasonable stress acts on a film can be reduced as much as possible. Therefore, it is possible to reliably reduce the situation where the film is damaged when correcting the winding deviation of the film.

It is a top view which shows the principal part of the winding deviation correction apparatus of the glass film which concerns on embodiment of this invention. It is a side view which shows the principal part of the winding deviation correction apparatus of the glass film which concerns on embodiment of this invention. It is a figure which shows the state which moved the unwinding mechanism of FIG. 1 to the width direction. It is a flowchart performed by the reference | standard position correction | amendment part shown in FIG. 1 at the time of correction | amendment of the winding gap of a glass film. It is a flowchart performed by the winding gap correction | amendment part shown in FIG. 1 at the time of the winding gap correction of a glass film. It is a top view which shows the principal part of the winding misalignment correction apparatus of the conventional glass film. It is a figure for demonstrating the problem of the winding misalignment correction apparatus of the conventional glass film.

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

  FIG.1 and FIG.2 is a figure which shows the winding misalignment correction apparatus of the film which concerns on one Embodiment of this invention. As shown in these drawings, the winding deviation correcting device includes an unwinding mechanism 2 that unwinds the glass film G from the glass film roll 1 in order. As shown in FIG. 2, the unwinding mechanism 2 is mounted on the movable stage 3. The movable stage 3 is movable in the width direction of the glass film G (in the direction of arrow A in FIG. 1) along a slide guide 5 provided on the fixed base 4. Therefore, by the movement of the movable stage 3, the unwinding mechanism 2 moves in the width direction of the glass film G, and accordingly, the side edge (end edge in the width direction) of the glass film G unwound from the glass film roll 1. The position of is adjusted.

  The glass film G unwound by the unwinding mechanism 2 is guided by the guide roller group 6 (guide rollers 6a and 6b and a plurality of guide rollers not shown), and is provided downstream with respect to the conveyance direction while being applied with tension. It is conveyed in the direction of arrow B in FIG. 1 and is wound up again in the state of a glass film roll at the downstream end of the conveyance path outside the figure. Of the guide roller group 6, the first guide roller 6a in the figure is mounted on the movable stage 3 side integrally with the unwinding mechanism 2, and the second guide roller 6b on the downstream side of the first guide roller 6a. Is mounted on the fixed base 4 side. That is, the first guide roller 6a is a width direction movable roller, and the second guide roller 6b is a width direction non-movable roller. Therefore, when the unwinding mechanism 2 is moved in the width direction, the side edge position of the glass film G unwound by the unwinding mechanism 2 changes mainly on the upstream side of the second guide roller 6b, and the second guide roller 6b. On the downstream side, the straight line travels in a direction perpendicular to the rotation axis of the second guide roller 6b (in the direction of arrow B in the figure) and hardly changes. Therefore, with the second guide roller 6b as a boundary, the upstream side is a change region X in which the side edge position of the glass film G is changed, and the downstream side is a non-change region Y in which the side edge position of the glass film G is not substantially changed. It is said. Here, the fluctuation width of the side edge position of the glass film G in the non-change region Y is, for example, in a range of 0.01 to 0.5 mm or less.

  In this embodiment, the guide roller group 6 is configured to drive and rotate according to the moving speed of the glass film G and to feed the glass film G. However, the guide roller group 6 is driven and rotated without driving. It may be configured as follows. Further, the first guide roller (width direction movable roller) 6a included in the guide roller group 6 may be omitted as appropriate. Furthermore, in order to protect the glass film G, the protective sheet may be wound on the glass film G in the state of the glass film roll 1. In this case, the protective sheet is peeled from the glass film G when the glass film G is unwound by the unwinding mechanism 2.

  The glass film G is, for example, a long body having a thickness of 10 to 300 μm and a width of 5 to 2000 mm, flat panel displays such as liquid crystal displays, plasma displays, and organic EL displays, solar cells, lithium ion batteries, It is used for glass substrates for devices such as digital signage, touch panels, and electronic paper, cover glasses for organic EL lighting, glass containers for medical products, window glass, laminated lightweight window glass, and the like.

  A first side edge position detection sensor 7 is disposed in the change area X of the glass film G, and a second side edge position detection sensor 8 is disposed in the non-change area Y of the glass film G.

  The 1st side edge position detection sensor 7 and the 2nd side edge position detection sensor 8 are the fixed positions on the conveyance path | route of the glass film G, are arrange | positioned only at the one end side of the width direction of the glass film G, and the glass film G Pass through each inspection area, so that the side edge positions of the glass film G are detected in order.

  In addition, as these side edge position detection sensors 7 and 8, sensors of various systems such as an optical system, an ultrasonic system, an air volume system, and the like can be used. When using an optical sensor, as shown in FIG. 2, a light projection part is arrange | positioned at the one side of the front and back of the glass film G, and a light-receiving part is arrange | positioned at the other side. Further, the side edge position detection sensors 7 and 8 may be disposed on both ends in the width direction of the glass film G, respectively.

  A control unit 9 is connected to the first side edge position detection sensor 7 and the second side edge position detection sensor 8, and this control unit 9 is based on the detection results of the side edge position detection sensors 7 and 8. The amount of movement of the movable stage 3, in other words, the amount of movement of the unwinding mechanism 2 mounted on the movable stage 3 is controlled.

  Specifically, the control unit 9 includes a reference position correction unit 9a and a winding deviation correction unit 9b.

  The reference position correction unit 9 a is based on the amount of deviation in the width direction between the side edge position of the glass film G detected by the second side edge position detection sensor 8 and the reference position of the second side edge position detection sensor 8. The reference position of the first side edge position detection sensor 7 is corrected. That is, the reference position of the first side edge position detection sensor 7 is detected by the second side edge position detection sensor 8 when the second side edge position detection sensor 8 detects the shift of the side edge position of the glass film G. The amount corresponding to the amount of deviation is corrected in the direction opposite to the deviation. Therefore, the reference position of the first side edge position detection sensor 7 is corrected to a value that reflects the amount of deviation of the glass film G in the non-change region Y.

  The winding misalignment correction unit 9b is arranged in the width direction between the side edge position detected by the first side edge position detection sensor 7 and the reference position of the first side edge position detection sensor 7 corrected by the reference position correction unit 9a. The movable stage 3 is moved based on the amount of deviation, and the position in the width direction of the unwinding mechanism 2 is corrected.

  Here, the first side edge position detection sensor 7 is moved closer to the first guide roller 6a between the first guide roller 6a and the second guide roller 6b included in the change region X for the following reason. Be placed. That is, as the distance between the first side edge position detection sensor 7 and the first guide roller 6a is shorter, the time until the movement result of the unwinding mechanism 2 is reflected in the detection result of the first side edge position detection sensor 7. Can be shortened. Therefore, if the time until the detection result is reflected is shortened, it is possible to prevent a problem that the unwinding mechanism 2 is moved excessively beyond the movement amount necessary for correcting the winding deviation of the actual glass film G. It is possible to reduce as much as possible the situation that the glass film G breaks due to an unreasonable stress. Note that the first side edge position detection sensor 7 may be disposed upstream of the first guide roller 6a as long as it is within the change region X.

  Further, the second side edge position detection sensor 8 is disposed on the downstream side (non-change region Y) of the second guide roller for the following reason. That is, as shown in FIG. 3, when the unwinding mechanism 2 is moved (in the direction of arrow A ′ in the drawing), the glass film G unwound by the unwinding mechanism 2 is mainly formed with the first guide roller 6a. Twist between the second guide roller 6b. Therefore, when the second side edge position detection sensor 8 is arranged on the upstream side of the second guide roller 6b, in the change region X located on the downstream side of the detection area of the second side edge position detection sensor 8, the glass film G The side edge position may further vary. As a result, the reference position of the first side edge position detection sensor 7 cannot be corrected properly, and the correction accuracy of the winding deviation of the glass film G is lowered. Therefore, the second side edge position detection sensor 8 is arranged in the non-change region Y in order to eliminate such a problem. Since the glass film G is corrected so as to go straight in a direction perpendicular to the rotation axis of the second guide roller 6b in the region downstream of the second guide roller 6b, the glass film G on the downstream side of the second guide roller 6b. In the non-change region Y, the final side edge position of the glass film G is determined. Therefore, if the second guide roller 6b is disposed in this region Y, the reference position of the first side edge position detection sensor 7 is appropriately corrected to reflect the final side edge position of the glass film G. It is possible to correct the winding deviation of the glass film G with high accuracy.

  In addition, as shown in FIG. 1, it is preferable that the axial center distance L1 of the 1st guide roller 6a and the 2nd guide roller 6b is 0.25 times or more of the width direction dimension L2 of the glass film G, and 0 More preferably, it is 4 times or more. That is, when the inter-axial distance L1 is less than 0.25 times the width direction dimension L2 of the glass film G, the change region X of the glass film G becomes too short, and even if a slight correction operation is performed, the glass film G may be excessively twisted. Therefore, it is preferable that the inter-axial distance L1 is in the above numerical range, and if it is within this range, it is possible to more reliably prevent a situation in which excessive twisting occurs in the glass film G during the correction operation. In addition, since the side edge position of the glass film G may meander if the distance L1 between axes becomes too long, it is preferable to set the distance L1 between axes as small as possible within the above numerical range.

  Next, the operation of the film misalignment correcting apparatus configured as described above will be described based on the flowcharts shown in FIGS. 4 is a flowchart executed by the reference position correcting unit 9a of the control unit 9, and FIG. 5 is a flowchart executed by the winding deviation correcting unit 9b of the control unit 9.

  As shown in FIG. 4, in the reference position correction unit 9a, first, in step S1, from the detection result of the second side edge position detection sensor 8, the inspection area (non-change area Y) of the second side edge position detection sensor 8 is obtained. Then, it is determined whether or not the side edge position of the glass film G is shifted from the reference position of the second side edge position detection sensor 8. As a result, if there is a deviation at the side edge position of the glass film G, in step S2, an amount corresponding to the deviation amount is provided in a direction opposite to the deviation of the side edge position detected by the second side edge position detection sensor 8. Only the reference position of the first side edge position detection sensor 7 is corrected. Then, the corrected reference position of the first side edge position detection sensor 7 is output to the winding deviation correcting unit 9b.

  On the other hand, as shown in FIG. 5, in the winding misalignment correction unit 9b, the corrected reference position of the first side edge position detection sensor 7 determined in the above-described procedure is input from the reference position correction unit 9a in step S3. The In step S4, from the detection result of the first side edge position detection sensor 7, in the inspection area of the first side edge position detection sensor 7 located in the change area X, the side edge position of the glass film G is the first side edge. It is determined whether or not there is a deviation from the corrected reference position of the position detection sensor 7. As a result, when the shift of the side edge position of the glass film G is detected, in step S5, the unwinding mechanism 2 is moved in the opposite direction of the shift (direction for correcting the shift) by the amount of movement necessary for correcting the shift. Move in the width direction to correct the winding shift of the glass film G.

  Here, the amount of movement of the unwinding mechanism 2 may be equal to the amount of displacement detected by the first side edge position detection sensor 7, but in order to prevent the glass film G from being excessively twisted and cracked, It is preferable to provide an upper limit value of the correction amount. That is, when the amount of deviation exceeds the upper limit value, it is preferable to control the movement amount of the unwinding mechanism 2 up to the upper limit value.

When the second side edge position detection sensor 8 does not detect a deviation between the side edge position of the glass film G and the reference position, the immediately preceding correction reference is used as the reference position of the first side edge position detection sensor 7. The position is used as it is.

  According to the glass film winding correction device according to the present embodiment as described above, the shift amount of the side edge position detected by the second side edge position detection sensor 8 arranged in the non-change region Y of the glass film G. Based on the above, the reference position of the first side edge position detection sensor 7 arranged in the change area X of the glass film G is sequentially corrected. The unwinding mechanism is based on the amount of deviation in the width direction between the corrected reference position of the first side edge position detection sensor 7 and the side edge position detected by the first side edge position detection sensor 7. The position in the width direction of 2 is appropriately corrected. Therefore, even if the position in the width direction of the unwinding mechanism 2 is corrected by the first side edge position detection sensor 7 arranged in the change region X of the glass film G, the reference position of the first side edge position detection sensor 7 is glass. Since it reflects the detection result of the second side edge position detection sensor 8 arranged in the non-change area Y of the film G, the side edge position of the glass film G is downstream of the first side edge position detection sensor 7. Does not change significantly, and the correction accuracy of the winding deviation of the glass film G is unlikely to decrease. And since the change area | region X of the glass film G is formed in the vicinity of the unwinding mechanism 2, the correction result of the width direction of the unwinding mechanism 2 is reflected in the detection result in the 1st side edge position detection sensor 7 immediately. Is done. For this reason, the ratio that the correction amount (movement amount) of the position in the width direction of the unwinding mechanism 2 exceeds the correction amount (movement amount) necessary for correcting the actual winding deviation is extremely small, which is inappropriate for the glass film G. Makes it difficult to act. Therefore, it is possible to correct the winding deviation of the glass film G with high accuracy while reducing the situation that the glass film G is damaged by the movement of the unwinding mechanism 2.

  In addition, this invention is not limited to said embodiment, It can implement with a various form. For example, in the above-described embodiment, the glass film G is illustrated as an object of correction of winding misalignment, but a film other than a glass film such as a resin film, paper, or metal may be subject to correction of winding misalignment.

  In addition, after correcting the winding deviation of the glass film G that has been unwound from the unwinding mechanism 2, the case where the glass film G with the corrected winding deviation is wound again into the state of the glass film roll by a winding mechanism that is not illustrated. Although demonstrated, the glass film roll taken out from the winding mechanism may be installed in the unwinding mechanism 2 again, and the winding deviation correction process may be executed twice or more on the same glass film G.

DESCRIPTION OF SYMBOLS 1 Glass film roll 2 Unwinding mechanism 3 Movable stage 4 Fixed base 5 Slide guide 6 Guide roller group 6a 1st guide roller (width direction movable roller)
6b Second guide roller (width direction non-movable roller)
7 First side edge position detection sensor 8 Second side edge position detection sensor 9 Control unit 9a Reference position correction unit 9b Deviation correction unit

Claims (3)

Unwinding means for unwinding the film from the film roll, side edge position detecting means for detecting the side edge position of the film unwound by the unwinding means, and the side edge position detected by the side edge position detecting means Control means for correcting the width direction position of the unwinding means based on the amount of deviation in the width direction between the reference position and the control position, and when correcting the width direction position of the unwinding means by the control means, In order from the upstream side in the longitudinal direction of the film, a change region where the side edge position of the film changes along the longitudinal direction, and a non-change region where the side edge position of the film does not change substantially along the longitudinal direction; Is a film misalignment correcting device in which is formed,
The side edge position detection means includes a first side edge position detection means arranged in the change area, and a second side edge position detection means arranged in the non-change area,
The control means is configured to detect the first side edge position based on a shift amount in a width direction between a side edge position detected by the second side edge position detection means and a reference position of the second side edge position detection means. A reference position correction unit for correcting a reference position of the detection unit; a side edge position detected by the first side edge position detection unit; and a reference position of the first side edge position detection unit corrected by the reference position correction unit. A film misalignment correcting device, comprising: a winding misalignment correcting section that corrects the position in the width direction of the unwinding means based on the amount of misalignment between the unwinding means.   The film misalignment correcting device according to claim 1, wherein the film is a glass film having a thickness of 300 μm or less. While the film is unwound from the film roll by the unwinding means, the side edge position of the film is detected in the side edge position detection area, and based on the amount of deviation in the width direction between the detected side edge position and the reference position. While correcting the position in the width direction of the unwinding means,
When correcting the position in the width direction of the unwinding means, in order from the upstream side in the longitudinal direction of the film, the change region where the side edge position of the film changes along the longitudinal direction, and the side edge position of the film A film misalignment correcting method in which a non-change region that does not substantially change along the longitudinal direction is formed,
As the side edge position detection area, a first side edge position detection area is provided in the change area, and a second side edge position detection area is provided in the non-change area, and is detected in the second side edge position detection area. While correcting the reference position of the first side edge position detection area based on the amount of deviation in the width direction between the side edge position and the reference position of the second side edge position detection means, the corrected reference position and A film misalignment correcting method, wherein the position in the width direction of the unwinding means is corrected based on the amount of misalignment in the width direction between the first edge position detection area and the side edge position detected in the first side edge position detection area.

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