JP2007187545A - Method of evaluating fiber orientation direction and contour of anisotropic fiber sheet, and device for stacking anisotropic fiber sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately evaluate a fiber orientation direction and/or a contour, even when an anisotropic fiber sheet has no pattern. <P>SOLUTION: A light source for irradiating part of the anisotropic fiber sheet and an imaging means for imaging the anisotropic fiber sheet surface are used. The imaging means is arranged so that at least part of the contour of the anisotropic fiber sheet is included in an imaging visual field of the imaging means, and the light source is moved so as to be parallel to a plane approximating the anisotropic fiber sheet surface. A bright part moving on the anisotropic fiber sheet in the imaging visual field is imaged continuously, and a locus of the bright part moving on the anisotropic fiber sheet in the imaging visual field is detected, and the fiber orientation direction of the anisotropic fiber sheet is discriminated from the detected locus of the bright part, and a discontinuous part in the moving domain of the bright part is detected, to thereby detect the contour of the anisotropic fiber sheet included in the imaging visual field. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for evaluating the fiber orientation direction and contour of an anisotropic fiber sheet, and more specifically, for example, a method that is particularly effective for automatic evaluation of, for example, the fiber orientation direction and sheet edge when laminating unidirectional fiber sheets About.

  Since FRP (fiber reinforced plastic) represented by CFRP (carbon fiber reinforced plastic) and GFRP (glass fiber reinforced plastic) using carbon fiber or glass fiber as a reinforced fiber is lightweight and has high durability, automobiles and aircraft It is applied as various constituent members.

  As a typical method for producing these FRPs, an autoclave molding method using a prepreg is known. In such a molding method, an intermediate base material called a prepreg in which a reinforcing fiber is impregnated with a matrix resin in advance is stacked on a mold, and then vacuum-sealed with a film material and heated and pressurized in an autoclave to form a composite material. . However, since the matrix resin impregnated in the prepreg is a thermosetting resin containing a curing agent, the curing reaction gradually proceeds, so that the pot life is short and a freezing storage facility is required. The restrictions on use were great.

  Therefore, in recent years, RTM molding methods and vacuum RTM molding methods have attracted attention as methods that can be more easily molded than conventional autoclave molding using prepregs. The RTM molding method is a method in which a preform (a laminate of reinforcing fiber sheets pre-shaped) is placed in a mold, and a matrix resin is injected and then cured, and the vacuum RTM molding method is the same as that in the RTM method before resin injection. In this method, the impregnation is accelerated by reducing the pressure inside the mold. In this RTM molding method or vacuum RTM molding method, the resin and the curing agent may be mixed immediately before the injection of the matrix resin, and the matrix resin can be stored at room temperature by dividing it into the resin and the curing agent. No equipment is required. In addition, there is an advantage that large equipment such as an autoclave is not required at the time of molding.

  When the RTM molding method or the vacuum RTM molding method is applied to various components such as automobiles and aircrafts, anisotropic fibers represented by unidirectional woven fabrics and the like are used in order to bring out the properties of the reinforcing fibers more effectively. It is necessary to laminate and preform the fiber orientation direction of each anisotropic fiber sheet at a predetermined angle and without shifting up and down using a sheet. This is very important in terms of the quality of the FRP structure, the manufacturing process, and the product approval. However, this requires skill and manpower, so during each process in the RTM molding method and the vacuum RTM molding method. However, it was a process that required improvement in productivity.

  In Patent Document 1, as a laminating apparatus that accurately controls the direction and position of sheet material, a sheet having a pattern is arranged on an imaging table, and an image is picked up by a camera from above the imaging table to detect the pattern of the stacked sheets. An apparatus for laminating by aligning the fiber orientation direction and the position based on the information is disclosed. However, this method has a problem that the fiber orientation direction and contour of the fiber sheet without a pattern cannot be evaluated, and the fiber orientation direction and position cannot be aligned and laminated.

  For example, even if you attempt to accurately evaluate and laminate the fiber orientation direction and position of the carbon fiber sheet, the carbon fiber is uniformly black, so with a normal light source irradiation, the pattern corresponding to the fiber orientation direction and position is evaluated with a camera. It cannot be done, and the fiber orientation direction and position cannot be matched and laminated.

In addition, even when trying to accurately evaluate the fiber orientation direction and position of each of the two carbon fiber sheets stacked in advance, it is sufficient to distinguish the two anisotropic fiber sheets with normal light source irradiation. Therefore, it is impossible to evaluate the fiber orientation direction and position with a camera, and it is impossible to inspect whether the fiber orientation direction and position are laminated.
Japanese Utility Model Publication No. 6-82556

  The present invention solves the above-mentioned conventional problems, and a method capable of accurately evaluating the fiber orientation direction and / or the contour even if the anisotropic fiber sheet has no handle, and the anisotropic fiber It aims at providing the lamination apparatus which can laminate | stack according to the fiber orientation direction and position of a sheet | seat.

In order to solve the above problems, the present invention is characterized by the following (1) to (9).
(1) Using a light source that irradiates a part of the anisotropic fiber sheet to the anisotropic fiber sheet and an imaging unit that images the surface of the anisotropic fiber sheet, the surface of the anisotropic fiber sheet is The light source is moved so as to be parallel to the approximate plane, the locus of the bright part moving on the anisotropic fiber sheet in the imaging field is detected, and the anisotropy is detected from the detected locus of the bright part. A method for discriminating the fiber orientation direction of an anisotropic fiber sheet for discriminating the fiber orientation direction of the fiber sheet.
(2) For the anisotropic fiber sheet, using the light source that irradiates a part of the anisotropic fiber sheet and the imaging unit that images the anisotropic fiber sheet surface, The optical fiber sheet is arranged so that at least a part of the contour of the sheet is included in the imaging field of view of the imaging means, the light source is moved so as to be parallel to a plane approximating the anisotropic fiber sheet surface, and the imaging The anisotropic fiber sheet included in the imaging field of view by continuously capturing images of bright parts moving on the anisotropic fiber sheet in the field of view and detecting discontinuous parts in the moving region of the bright parts An anisotropic fiber sheet contour detection method for detecting the contour of a sheet.
(3) For the anisotropic fiber sheet, using the light source that irradiates a part of the anisotropic fiber sheet and the imaging unit that images the anisotropic fiber sheet surface; The optical fiber sheet is arranged so that at least a part of its contour is included in the imaging field of view of the imaging means, and the light source is moved so as to be parallel to a plane approximating the anisotropic fiber sheet surface, The bright part moving on the anisotropic fiber sheet in the imaging field of view is continuously imaged, the locus of the bright part moving on the anisotropic fiber sheet in the imaging field of view is detected, and the detected bright part The orientation of the anisotropic fiber sheet included in the imaging imaging field of view is determined by determining the fiber orientation direction of the anisotropic fiber sheet from the trajectory and detecting the discontinuous portion in the moving region of the bright part. Fiber of anisotropic fiber sheet to detect Evaluation method countercurrent direction and contour.
(4) With respect to two or more anisotropic fiber sheets that are overlapped with different fiber orientation directions, the imaging means is used by using a light source and an imaging means for imaging the anisotropic fiber sheet surface. A part of the contour of at least one anisotropic fiber sheet and a surface of at least two anisotropic fiber sheets are arranged so as to be included in an imaging field of view of the imaging means, and the two or more anisotropic The light source is moved so as to be parallel to a plane approximating the surface of the conductive fiber sheet, and the bright part moving on the two or more anisotropic fiber sheets in the imaging field is continuously imaged. Detecting the locus of the bright part moving on the anisotropic fiber sheet, determining the fiber orientation direction of each anisotropic fiber sheet from the detected locus of the bright part, and within the movement region of the bright part Before being included in the field of view by detecting discontinuities 2 above evaluation method of the fiber orientation direction and the contour of each sheet of the anisotropic fiber sheet performs edge detection of the anisotropic fiber sheet.
(5) A method for laminating an anisotropic fiber sheet, wherein the laminating direction is controlled based on information obtained by the method for determining the fiber orientation direction of the anisotropic fiber sheet according to (1).
(6) Based on the information obtained by the method for detecting the contour of the anisotropic fiber sheet according to (2), the stacking position is controlled, and the anisotropic fiber sheet according to (5) Lamination method.
(7) Based on the information obtained by evaluating the fiber orientation direction and contour of each of the two or more anisotropic fiber sheets according to (4), fine adjustment of the fiber orientation direction and position at the time of lamination is performed. A method for laminating anisotropic fiber sheets, which is performed.
(8) Brightness of an image continuously picked up by one or more sensing mechanisms including at least a light source, moving means for the light source, and imaging means for covering an area irradiated by the movement of the light source, and the sensing mechanism. And a data processing mechanism for detecting the movement of the part by image processing.
(9) The fiber orientation direction during the lamination of the anisotropic fiber sheets based on the output from the fiber orientation direction and contour of the anisotropic fiber sheet according to (8) and the data processing mechanism of the evaluation device And / or a fiber sheet laminating device having a control mechanism for controlling a laminating position.

  In the present invention, the anisotropic fiber sheet refers to a sheet having a fiber-like surface layer and directionality among woven fabrics, knitted fabrics, non-woven fabrics, leathers, fabrics, papers and the like. As a specific example, there is a reinforcing fiber base material used for FRP, but it is not limited thereto.

  Further, in the present invention, the plane approximating the surface of the anisotropic fiber sheet is the center of two planes whose distance between the planes is a predetermined value or less among the parallel planes sandwiching the region to be evaluated of the sheet. Say no plane. The predetermined value here is a predetermined value because the distance between the two planes should be set appropriately in consideration of the required accuracy, but the fiber orientation direction ± 1 in a 100 mm square imaging field of view. If accuracy within ± ° is required, evaluation of the present invention is possible if it is usually 13 mm or less. If it is 4 mm or less, it is more preferable in terms of accuracy. If the approximation cannot be achieved with one plane, a plane that is approximated by dividing into a plurality of regions may be set.

In the present invention, when the light source is moved so as to be parallel to the plane approximating the anisotropic fiber sheet surface, the moving direction of the center of gravity of the light source is parallel to the plane approximating the anisotropic fiber sheet surface. Say that.
Moreover, in this invention, discrimination | determination of a fiber orientation direction means acquiring the angle which the fiber orientation direction of an anisotropic fiber sheet makes with a reference | standard direction as a numerical value.

  Further, in the present invention, the detection of the contour means that coordinates representing a line constituting the contour of the anisotropic fiber sheet are acquired as an array of two-dimensional numerical values.

  Moreover, in this invention, evaluation shall comprehensively represent performing discrimination of a fiber orientation direction and / or detection of a contour.

  ADVANTAGE OF THE INVENTION According to this invention, the fiber orientation direction and outline of an anisotropic fiber sheet can be evaluated reliably. And the fiber sheet laminating apparatus using the evaluation method of the present invention makes it possible to reliably evaluate the fiber orientation direction and the contour of the anisotropic fiber sheet. It becomes easy to improve the production yield and quality of the lamination process of the reinforcing fiber sheets in the production of the body, and more reliably satisfy the product approval standards. Furthermore, it is possible to automate the process and reduce manpower.

  Next, preferred embodiments of the present invention will be described with reference to the drawings. Drawing 1 is a mimetic diagram showing one embodiment of a fiber orientation direction and an outline evaluation method of an anisotropic fiber sheet of the present invention. A situation is shown in which the light source 31 is moved in the direction 32 indicated by the arrow by the irradiation device 3, the image of the imaging field of view 41 is captured by the imaging means 4, and transmitted to the image processing device.

  In the present invention, by imaging in this way, the fiber orientation direction of the anisotropic fiber sheet can be determined from the locus of movement of the bright portion irradiated on the surface of the anisotropic fiber sheet. Moreover, the outline of an anisotropic fiber sheet is detectable by detecting the discontinuous part of a bright part. In addition, the determination of the fiber orientation direction and the detection of the contour can be evaluated simultaneously. In order to explain the principle, FIG. 2 shows a situation where a part of the fibers of the anisotropic fiber sheet 1 in FIG. 1 is irradiated from a light source at an angle of 90 °. FIG. 3 shows a situation where the light 33 is condensed on the imaging means in the case of FIG. FIG. 4 shows a state in which a part of the anisotropic fiber sheet 1 in FIG. 1 is irradiated from a light source at an angle of 0 °. FIG. 5 shows a situation where the light 34 is not condensed on the imaging means in the case of FIG.

  In the situation of FIG. 2, the light 33 is irradiated at an angle of 90 ° with the fiber 21, so that reflection in the direction of the imaging means 4 occurs on the surface of the fiber 21, and a bright image is taken. Further, in the situation of FIG. 4, the light 34 is irradiated at an angle of 0 ° with the fiber 22, so that no reflection occurs in the direction of the image pickup means 4 on the surface of the fiber 22 as shown in FIG. The That is, the lightness and darkness of the surface of the anisotropic fiber sheet changes according to the angle between the fiber orientation direction and the irradiation direction, and in particular, the fibers arranged near an angle of 90 ° with respect to the irradiation direction are imaged as bright portions. The

  Next, in FIG. 1, the imaging of the bright part 51 which moves on the surface of the anisotropic fiber sheet 11 whose fiber orientation direction is 90 ° with respect to the imaging visual field 41 is shown in FIG. Further, FIG. 7 shows an image of the bright portion 53 that moves on the surface of the anisotropic fiber sheet 12 whose fiber orientation direction is 45 ° with respect to the imaging field of view 41 in FIG.

  In the situation of FIG. 6, the surface portion of the anisotropic fiber sheet 11 having an angle of 90 ° with the irradiation direction is imaged as the bright portion 51. Since the light source 31 moves in parallel with the surface of the anisotropic fiber sheet 11 (an approximate plane), the irradiation direction and the fiber orientation direction of the anisotropic fiber sheet 11 are always constant regardless of the position of the light source 31. is there. Therefore, following the movement of the light source 31, the bright part 41 moves along the fiber orientation. By detecting the locus 52 of the bright part, the fiber orientation direction of the anisotropic fiber sheet 11 can be determined. Moreover, since the bright part 51 becomes discontinuous at the edge part of the anisotropic fiber sheet 11, the discontinuous part of the bright part 51 which moves following the movement of the light source 31 is detected, and the anisotropic fiber sheet 11 is detected. Can be detected. That is, the fiber orientation direction and contour of the anisotropic fiber sheet can be evaluated.

  Also in the situation of FIG. 7, the surface portion of the anisotropic fiber sheet 12 having an angle of 90 ° with the irradiation direction is imaged as the bright portion 53. Similar to the situation of FIG. 6, the fiber orientation direction and contour of the anisotropic fiber sheet can be evaluated.

  Next, FIG. 8 shows a case where the irradiation apparatus is in a different direction from FIG. 6 in FIG.

  In the situation of FIG. 8, the light source 61 moves in the direction 62 in the irradiation device 6 having a direction different from that in FIG. 6. However, as in FIG. 6, the surface portion of the anisotropic fiber sheet 11 having an angle of 90 ° with the irradiation direction is imaged as the bright portion 51, and the fiber orientation direction and contour of the anisotropic fiber sheet can be evaluated. In this figure, the irradiation device 6 is tilted counterclockwise from the direction of FIG. That is, regardless of the angle of the anisotropic fiber sheet with respect to the imaging field, and even if the moving direction of the light distribution device and the light source changes, the moving direction of the light source depends on the surface of the anisotropic fiber sheet ( As long as it is parallel to the approximate plane and a bright portion is generated, the fiber orientation and contour of the anisotropic fiber sheet can be evaluated. The imaging field of view 41 may be any range including at least a part of the surface of the anisotropic fiber sheet when determining the fiber orientation direction, but when detecting the contour, the anisotropic fiber sheet It is necessary to choose to include at least a part of the contour. In the case of determining the fiber orientation direction and / or detecting the contour of two or more anisotropic fiber sheets arranged in an overlapping manner, at least a part of the contour of the anisotropic fiber sheet and at least two previous periods It is necessary to choose to include the surface of the anisotropic fiber sheet.

  Next, in FIG. 1, the case where the anisotropic fiber sheet is a curved surface is shown in FIG. 9, and the A-A 'sectional view of FIG. 9 is shown in FIG.

  In the situation of FIG. 9, since the anisotropic fiber sheet 7 is a curved surface, the angle formed by the irradiation direction and the fiber orientation direction of the anisotropic fiber sheet 7 varies depending on the position of the light source 31. Therefore, as in the situation of FIG. 6, the bright part does not move along the fiber orientation following the movement of the light source, and the locus of this bright part is detected, and the fiber orientation direction of the anisotropic fiber sheet and / or Or the contour cannot be evaluated. However, by approximating the curved surface with the plane 71, the fiber orientation direction and / or the contour of the anisotropic fiber sheet 7 can be evaluated with respect to the plane 71 as in the situation of FIG. 6. More specifically, as shown in FIG. 10, the approximate plane 71 is a central plane of two planes 72 having a distance between planes of a predetermined value or less among planes parallel to each other with the anisotropic fiber sheet 7 interposed therebetween. is there. The predetermined value here is a predetermined value because the distance between the two planes should be set appropriately in consideration of the required accuracy, but the fiber orientation direction ± 1 in a 100 mm square imaging field of view. If the accuracy within ± ° is required, the above evaluation can be performed if it is usually 13 mm or less. If it is 4 mm or less, it is more preferable in terms of accuracy.

  Next, in FIG. 9, the case where the anisotropic fiber sheet which is a curved surface is approximated by a plurality of planes is shown in FIG. 11, and the A-A 'sectional view of FIG. 11 is shown in FIG.

  9 and 10, when the entire imaging field of view is approximated collectively, if the curvature of the curved surface is greater than or equal to a predetermined value, the distance between the planes is also greater than or equal to the predetermined value, and the plane approximated to the actual fiber orientation direction However, as shown in FIG. 11, by dividing the curved surface into a plurality of regions and performing the approximation on each curved surface, However, this is not the case because the bending and the contour of the anisotropic fiber sheet can be evaluated in the same manner as in the situation of FIG. More specifically, as shown in FIG. 12, the plurality of approximate planes 73 have an anisotropic fiber sheet 7 sandwiched between the divided areas, and among the planes parallel to each other, the distance between the planes is a predetermined value or less. This is the central plane of the two planes 72.

  Next, in FIG. 1, the imaging of the bright part which moves the surface of two or more anisotropic fiber sheets is shown in FIG.

  In the situation shown in FIG. 13, the surface portion of the anisotropic fiber sheet 11 having an angle of 90 ° with the irradiation direction is imaged as the bright portion 51, and the anisotropic fiber sheet 12 having the same angle of 90 ° with the irradiation direction. The surface portion is imaged as the bright portion 53. Since the light source 31 moves in parallel with the surfaces (approximate planes) of the anisotropic fiber sheets 11 and 12, the irradiation direction and the fiber orientation direction of the anisotropic fiber sheet are always constant regardless of the position of the light source 31. It is. Therefore, following the movement of the light source 31, the bright portions 51 and 53 move along the fiber orientation. By detecting the locus 52 and 54 of these bright portions, the fiber orientation direction of each anisotropic fiber sheet can be determined. Further, since the bright part 51 or 53 is discontinuous at the end of the anisotropic fiber sheet 11 or 12, the discontinuous part of the bright part 51 or 53 that moves following the movement of the light source 31 is detected, The contours of the anisotropic fiber sheets 11 and 12 can be detected. That is, the fiber orientation and contour of two or more anisotropic fiber sheets can be evaluated.

  In the above description, the irradiation apparatus has been described as one, but the fiber orientation direction and the contour of the anisotropic fiber sheet can be evaluated even when there are two or two or more as shown in FIG.

  Using such an evaluation method of the present invention, a suitable fiber sheet laminating apparatus can be realized. That is, for example, an irradiation device and a light source moving unit are provided, and one or a plurality of sensing mechanisms including at least an imaging unit that covers an area irradiated by the movement of the light source, and the brightness of images continuously captured by the sensing mechanism A control mechanism for controlling the fiber orientation direction and / or the stacking position when laminating anisotropic fiber sheets based on an output from an evaluation apparatus having a data processing mechanism for detecting movement of the image by image processing It is a fiber sheet laminating device that can automatically and precisely laminate fiber sheets according to specifications.

  The evaluation method of the fiber orientation direction and the contour of the anisotropic fiber sheet of the present invention described above can be suitably used not only in the fiber sheet laminating apparatus but also in a field such as a fiber sheet continuous conveyance line.

It is a schematic diagram which shows one Embodiment of the fiber orientation direction and outline evaluation method of an anisotropic fiber sheet concerning this invention. It is a schematic diagram which shows the condition which looked at a mode that a fiber was irradiated at an angle of 90 degrees from the upper direction of the anisotropic fiber sheet. It is a schematic diagram which shows the condition where light is condensed to the imaging device provided in the sky of the anisotropic fiber sheet in the case of FIG. It is a schematic diagram which shows the condition which looked at the mode irradiated to a fiber at the angle of 0 degree from the sky of the anisotropic fiber sheet. It is a schematic diagram which shows the condition where light is not condensed to the imaging device provided in the sky of the anisotropic fiber sheet in the case of FIG. It is a schematic diagram which shows the imaging of the bright part which moves the anisotropic fiber sheet surface of an angle of 90 degrees with respect to an imaging visual field in FIG. It is a schematic diagram which shows the imaging of the bright part which moves the anisotropic fiber sheet surface of an angle of 45 degrees with respect to an imaging visual field in FIG. FIG. 5 is a schematic diagram illustrating imaging of a bright portion that moves on the surface of an anisotropic fiber sheet at an angle of 90 ° with respect to an imaging field when the irradiation apparatus has an inclination different from that in FIG. In FIG. 1, it is a schematic diagram which shows one Embodiment of the evaluation method of a fiber orientation direction and an outline about the plane which approximates the anisotropic fiber sheet surface which is a curved surface. FIG. 10 is a cross-sectional view taken along line A-A ′ of FIG. 9. It is a schematic diagram which shows the condition which approximated the anisotropic fiber sheet surface which is a curved surface by several planes. It is A-A 'sectional drawing of FIG. It is a schematic diagram which shows the imaging of the bright part which moves the surface of two anisotropic fiber sheets arrange | positioned with different fiber orientation directions. It is a schematic diagram which shows the imaging of the bright part which moves the surface of two anisotropic fiber sheets arrange | positioned with different fiber orientation directions, when there are two irradiation apparatuses.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anisotropic fiber sheet 11 Anisotropic fiber sheet 12 of an angle of 90 degrees with respect to an imaging visual field 12 Anisotropic fiber sheet 2 of an angle of 45 degrees with respect to an imaging visual field 2 Fiber 21 An orientation of 90 degrees with respect to the irradiation direction Fiber 22 in the direction Fiber 3 in the orientation direction of 0 ° with respect to the irradiation direction Irradiation device 31 Light source 32 Movement direction 33 of the light source Light 34 that irradiates the fiber at an angle of 90 ° Light that irradiates the fiber at an angle of 0 ° 4 Imaging means 41 Imaging field of view 51 Bright part 52 moving the surface of the anisotropic fiber sheet at an angle of 90 ° with respect to the imaging field of view 52 Bright part moving the surface of the anisotropic fiber sheet at an angle of 90 ° with respect to the imaging field of view Trajectory 53 of the bright portion moving on the anisotropic fiber sheet surface at an angle of 45 ° with respect to the imaging field of view 6 Trajectory 6 of the bright portion moving on the surface of the anisotropic fiber sheet with an angle of 45 ° with respect to the imaging field of view Irradiation device 61 tilted with respect to field of view The light source 62 of the irradiation device tilted with respect to the moving direction of the light source of the irradiation device tilted with respect to the imaging field 7 The anisotropic fiber sheet 71 that is a curved surface The plane 72 that approximates the surface of the anisotropic fiber sheet that is a curved surface A plurality of planes approximating the surface of the anisotropic fiber sheet that is a curved surface with two planes 73 having a distance between planes of a predetermined value or less among planes parallel to each other sandwiching an anisotropic fiber sheet

Claims (9)

A plane that approximates the surface of the anisotropic fiber sheet by using a light source that irradiates a part of the anisotropic fiber sheet and an imaging unit that images the surface of the anisotropic fiber sheet. The light source is moved so as to be parallel to the imaging field, the locus of the bright part moving on the anisotropic fiber sheet in the imaging field of view is detected, and the anisotropic fiber sheet is detected from the detected locus of the bright part. A method for discriminating a fiber orientation direction of an anisotropic fiber sheet for discriminating a fiber orientation direction. Using the light source that irradiates a part of the anisotropic fiber sheet with respect to the anisotropic fiber sheet and the image pickup means that images the surface of the anisotropic fiber sheet, the imaging unit is connected to the anisotropic fiber sheet. The at least part of the contour of the imaging means is arranged so as to be included in the imaging field of the imaging means, the light source is moved so as to be parallel to a plane approximating the anisotropic fiber sheet surface, and the imaging field of view The contour of the anisotropic fiber sheet included in the imaging field of view is detected by continuously imaging the bright part moving on the anisotropic fiber sheet and detecting the discontinuous part in the moving region of the bright part. A method for detecting the contour of an anisotropic fiber sheet to be detected. Using the light source that irradiates a part of the anisotropic fiber sheet with respect to the anisotropic fiber sheet and the image pickup means that images the surface of the anisotropic fiber sheet, the imaging unit is connected to the anisotropic fiber sheet. Is arranged so that at least a part of the contour is included in the imaging field of the imaging means, and the light source is moved so as to be parallel to a plane that approximates the surface of the anisotropic fiber sheet. While continuously imaging the bright part moving on the anisotropic fiber sheet, detecting the locus of the bright part moving on the anisotropic fiber sheet in the imaging field of view, from the detected locus of the bright part The fiber orientation direction of the anisotropic fiber sheet is determined, and the contour of the anisotropic fiber sheet included in the imaging imaging field of view is detected by detecting a discontinuous portion in the moving region of the bright part. Fiber orientation of anisotropic fiber sheet And contour evaluation method. At least one imaging means is used by using a light source and an imaging means for imaging the surface of the anisotropic fiber sheet with respect to two or more anisotropic fiber sheets arranged to overlap with each other in different fiber orientation directions. A part of the contour of the anisotropic fiber sheet and a surface of at least two of the anisotropic fiber sheets are included in an imaging field of the imaging unit, and the two or more anisotropic fiber sheets The light source is moved so as to be parallel to a plane approximating the surface, the bright part moving on the two or more anisotropic fiber sheets in the imaging field is continuously imaged, and the anisotropic direction of the imaging field Detecting the locus of the bright part moving on the conductive fiber sheet, discriminating the fiber orientation direction of each anisotropic fiber sheet from the detected locus of the bright part, and discontinuous portions in the moving area of the bright part The anisotropic contained in the imaging field of view by detecting Evaluation method of fiber orientation direction and the contour of each sheet of two or more anisotropic fiber sheet for sensing the contour of the fiber sheet A method for laminating an anisotropic fiber sheet, wherein the laminating direction is controlled based on information obtained by the method for discriminating the fiber orientation direction of the anisotropic fiber sheet according to claim 1. The method for laminating an anisotropic fiber sheet according to claim 5, wherein the laminating position is controlled based on information obtained by the method for detecting the contour of the anisotropic fiber sheet according to claim 2. Based on the information obtained by evaluating the fiber orientation direction and contour of each of the two or more anisotropic fiber sheets according to claim 4, fine adjustment of the fiber orientation direction and position at the time of lamination is performed. A method for laminating anisotropic fiber sheets. One or more sensing mechanisms including at least a light source, a moving means for the light source, and an imaging means for covering an area irradiated by the movement of the light source, and a movement of a bright portion of an image continuously captured by the sensing mechanism And an apparatus for evaluating the fiber orientation direction and the contour of the anisotropic fiber sheet, characterized in that the apparatus has a data processing mechanism for detecting the image by image processing. The fiber orientation direction and / or lamination at the time of lamination of the anisotropic fiber sheet based on the output from the fiber orientation direction and contour of the anisotropic fiber sheet according to claim 8 and the output from the data processing mechanism of the evaluation device. A fiber sheet laminating apparatus comprising a control mechanism for controlling a position.

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