WO2011142462A1 - Procédé de mesure de forme pour élément en forme de bande, et dispositif à cet effet - Google Patents

Procédé de mesure de forme pour élément en forme de bande, et dispositif à cet effet Download PDF

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Publication number
WO2011142462A1
WO2011142462A1 PCT/JP2011/061072 JP2011061072W WO2011142462A1 WO 2011142462 A1 WO2011142462 A1 WO 2011142462A1 JP 2011061072 W JP2011061072 W JP 2011061072W WO 2011142462 A1 WO2011142462 A1 WO 2011142462A1
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WO
WIPO (PCT)
Prior art keywords
shaped member
belt
laser
light
displacement
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PCT/JP2011/061072
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English (en)
Japanese (ja)
Inventor
伸也 岩山
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株式会社ブリヂストン
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Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2011142462A1 publication Critical patent/WO2011142462A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2518—Projection by scanning of the object
    • G01B11/2522—Projection by scanning of the object the position of the object changing and being recorded

Definitions

  • the present invention relates to a method and apparatus for measuring the shape of a belt-like member for measuring the shape of the belt-like member such as a carcass ply and the shape such as the joint amount.
  • the gap between the cut surfaces of a belt-shaped rubber member such as a tread that is extruded from an extruder, cut into a regular shape, and conveyed is sequentially measured.
  • a length measuring device for a belt-like rubber member that measures the length of the belt-like rubber member from a distance between them is known (for example, Patent Document 1). As shown in FIG. 10, the length measuring device is provided on the downstream side of a cutter 71 that cuts a continuously-extruded belt-like rubber member 70 into a regular shape and of the cut regular rubber-like rubber member 70L.
  • the displacement sensor 72 is installed above, and the laser beam is irradiated from the cutting inclination angle direction of the cut belt-shaped rubber member 70L, and the laser beam reflected by the surface of the band-shaped rubber member 70L is a detection unit of the displacement sensor 72. This is detected by a photoelectric sensor (not shown), and the position of the gap 73 is sequentially detected by utilizing the fact that the intensity of reflected light decreases when the gap 73 of the belt-like rubber member 70L is irradiated. Each time the position of the gap 73 is detected, the detected distance between the gaps 73 is calculated using the output of the rotary encoder 75 connected to the rotary shaft 74J of the conveyor 74 that conveys the belt-like rubber members 70 and 70L. Then, the length of the band-shaped rubber member 70L cut into a regular shape is measured.
  • the present applicant has proposed a belt-shaped member length measuring device using a two-dimensional displacement sensor as the displacement sensor.
  • the length measuring device includes a laser light source 81a that irradiates a line-shaped laser beam and a CCD camera, and is reflected on the surface of the tire constituent member 80.
  • a tire configuration that is affixed to a molding drum 82 that rotates at a predetermined speed by a two-dimensional displacement sensor 81 that includes a displacement amount measuring unit 81b that measures a displacement amount of a belt-shaped tire component member 80 from a laser light receiving position. While irradiating the member 80 with a line beam inclined at a predetermined angle with respect to the longitudinal direction of the tire constituent member 80, the reflected light from the irradiation part of the tire constituent member 80 is received and the starting end 80a and the terminal end of the tire constituent member 80 are received. The position of (not shown) is measured.
  • the two-dimensional displacement sensor 81 can detect the position of the step because the direction of the reflected light changes when the step portion (start end) of the tire constituent member 80 exists in the laser light irradiation portion.
  • the encoder 83 is attached to the molding drum 82 and the control means 84 is provided, and the detection result of the two-dimensional displacement sensor 81 is sampled every time the molding drum 82 rotates by a predetermined angle, thereby By repeatedly detecting the step portion, position information in the width direction of the step portion of the tire constituent member 80 can be obtained.
  • Patent Document 2 two two-dimensional displacement sensors are used, but in order to measure the positions of the start end and the end end over the entire width when the width of the tire constituent member 80 is wide, the inclination angle is increased. It is necessary to take. However, when the inclination angle is increased, the interval between the measurement points becomes wider, which causes a problem that the measurement accuracy is lowered. Further, in order to increase the number of measurement points, it is necessary to increase the number of two-dimensional displacement sensors. However, since the two-dimensional displacement sensor of the conventional length measuring device can measure one point with one unit, for example, In order to perform four-point measurement, four two-dimensional displacement sensors are required.
  • the present invention has been made in view of conventional problems, and measures the amount of displacement at a plurality of locations, such as the end positions of the belt-shaped member, without increasing the number of cameras, and efficiently measures the shape of the belt-shaped member. It is an object to provide a method and an apparatus therefor.
  • the invention according to claim 1 of the present application is directed to a laser device that irradiates the surface of the belt-shaped member with laser light extending along the longitudinal direction of the belt-shaped member, and reflected light from the belt-shaped member of the laser beam.
  • the reflected image of the laser beam is photographed while moving relatively in the longitudinal direction of the belt-shaped member with respect to the imaging means for receiving and photographing the reflected image of the laser beam, and the strip-shaped image is taken from the photographed reflected image.
  • the laser beam emitted by the laser device is transmitted diffraction Diffracted and separated into transmitted light and diffracted light using a grating and irradiating the surface of the strip member with a plurality of laser beams composed of the transmitted light and the diffracted light separated from each other in the width direction of the strip member , Characterized by measuring the displacement of the plurality of positions in the width direction of the belt-shaped member and a reflected image of the diffracted light and the reflected image of the transmitted light.
  • the laser beam from the laser device is separated into a plurality of laser beams (transmitted light and diffracted light) and irradiated on the belt-shaped member to capture the reflected image.
  • the displacement amount at a plurality of positions in the width direction of the belt-like member can be simultaneously measured with a single photographing apparatus. Therefore, since the measurement resolution can be improved, the surface shape of the belt-like member can be measured with high accuracy.
  • a laser device that irradiates a surface of a belt-shaped member with a laser beam extending along a longitudinal direction of the belt-shaped member, and a laser beam that receives reflected light from the belt-shaped member.
  • a displacement measuring means for measuring a displacement amount of the belt-like member from the reflected image, and a displacement amount of the belt-like member measured by the displacement amount measuring means.
  • a shape measuring device for a belt-like member comprising shape measuring means for measuring the surface shape of the belt-like member, and moving means for moving the belt-like member relative to the laser device and the imaging means in the longitudinal direction of the belt-like member.
  • the laser beam emitted from the laser device is diffracted and separated into transmitted light and diffracted light, and extends along the longitudinal direction of the strip member, and is separated from each other in the width direction of the strip member.
  • a transmission type diffraction grating that emits a plurality of laser beams composed of light and the diffracted light, and the displacement measuring means includes a reflected image of the transmitted light and a reflected image of the diffracted light captured by the imaging means.
  • the displacement amounts at a plurality of locations in the width direction of the belt-like member are measured. Accordingly, it is possible to provide a belt-like member shape measuring device capable of simultaneously measuring displacement amounts at a plurality of positions in the width direction of the belt-like member with one laser device and one photographing device. Resolution can be improved, and the surface shape of the belt-like member can be measured with high accuracy.
  • the laser beam from the laser apparatus is parallel light rays, which is disposed between the laser apparatus and the transmission diffraction grating.
  • a collimator lens that converts the reflected light of the transmitted light and the reflected light of the diffracted light, respectively, and a mirror that focuses the reflected light on the imaging means.
  • the belt-shaped member in the belt-shaped member shape measuring apparatus according to the second or third aspect, includes the laser device, the transmission diffraction grating, and the displacement measuring unit.
  • the first and second displacement measuring devices installed separately from each other in the width direction, the laser device of the first displacement measuring device and the laser device of the second displacement measuring device alternately
  • An illumination light control means for lighting is provided.
  • the surface shape of the belt-shaped member can be measured with high accuracy.
  • the first displacement amount measuring device and the second displacement amount measuring device are: It is preferable to dispose each on both sides of the imaging means.
  • a laser device that irradiates the surface of the belt-shaped member with laser light extending along a longitudinal direction or a width direction of the belt-shaped member, and receives reflected light from the belt-shaped member of the laser light.
  • Imaging means for capturing a reflected image of the laser beam
  • displacement amount measuring means for measuring a displacement amount of the belt-like member from the reflection image, and based on the displacement amount of the belt-like member measured by the displacement amount measuring means.
  • a strip-shaped member comprising: a shape measuring unit that measures a surface shape of the strip-shaped member; and a moving unit that moves the strip-shaped member relative to the laser device and the imaging unit in the longitudinal direction of the strip-shaped member.
  • a shape measuring device a collimator lens that converts the laser light from the laser device into parallel rays, and a part of the laser light emitted from the collimator lens, A beam splitter that reflects the laser beam to be emitted in a direction perpendicular to the incident direction, a first transmission diffraction grating that diffracts and separates the laser beam that has passed through the beam splitter into transmitted light and diffracted light, A second transmissive diffraction grating that diffracts and separates the laser light reflected by the beam splitter into transmitted light and diffracted light, and the transmitted light and diffracted light emitted from the second transmissive diffraction grating are band-shaped.
  • the means measures a displacement amount at a plurality of locations in the width direction and a displacement amount at a plurality of locations in the longitudinal direction of the belt-shaped member from the reflected image of the transmitted light and the reflected image of the diffracted light photographed by the imaging means. And it is characterized in and.
  • the displacement amount at a plurality of positions in the width direction of the belt-shaped member and the displacement amount at a plurality of positions in the longitudinal direction can be simultaneously measured with one laser device and one imaging means,
  • the shape of the joint portion can be measured simultaneously. Therefore, the surface shape of the belt-like member can be measured with high accuracy.
  • the laser device is a laser device including a plurality of laser elements, a collimator lens that converts each laser beam into parallel rays, and a part of the laser beam emitted from the collimator lens.
  • a beam splitter that passes and reflects the remaining laser light and emits it in a direction perpendicular to the incident direction, and a mirror that reflects the laser light reflected by the beam splitter in the direction of the belt-shaped member are provided, and the displacement amount Displacement amounts at a plurality of locations in the width direction of the belt-shaped member from the reflected image of the laser light that has passed through the beam splitter photographed by the imaging means and the reflected image of the laser light reflected by the beam splitter by the measuring means What is necessary is just to measure the displacement amount of several places of a longitudinal direction.
  • the photographing control means includes a photographing control means for controlling a photographing timing of the imaging means.
  • the imaging means is controlled so that the imaging interval at the time of acceleration / deceleration of the moving speed of the belt-like member with respect to the laser device and the imaging means is shorter than the imaging interval when the moving speed is constant.
  • the rotational speed of the drum is gradually increased and rotated at a high speed for a certain period of time, and when the end of winding is approached, it is decelerated and stopped.
  • the drum rotates at a low speed at the start and end of winding of the belt-shaped member.
  • the shooting timing of the imaging means is controlled as in the present invention, the winding start and end of winding of the strip member can be finely sampled, and therefore the start and end positions of the strip member can be accurately measured. Can do. Further, during constant speed rotation that does not require high measurement accuracy, rough sampling is performed, so that the calculation processing time can be shortened and the burden on the apparatus can be reduced.
  • a laser device that irradiates a surface of a subject with a line-shaped laser beam, an imaging unit that receives a reflected light of the laser beam from the subject and photographs a reflected image of the laser beam, and the laser device
  • a collimator lens that converts the laser beam from the laser beam into a parallel beam and emits it, a transmissive diffraction grating that diffracts and separates the laser beam from the collimator lens into a transmitted beam and a diffracted beam, and a plurality of images taken by the imaging means
  • One laser device and one imaging device that are preferably used in a shape measuring device for a belt-like member by a displacement amount measuring means for measuring a displacement amount at a plurality of locations of the subject from a reflected image of the laser beam
  • a displacement sensor that can simultaneously measure the amount of displacement at a plurality of positions of the subject can be configured using the apparatus.
  • a laser device having a plurality of laser elements and irradiating the surface of the subject with a plurality of line-shaped laser beams; and a reflected image of the laser beam by receiving the reflected light of the laser beam from the subject.
  • FIG. 1 is a diagram showing an outline of a tire component shape measuring apparatus (hereinafter referred to as a shape measuring apparatus) 10 according to the present embodiment
  • FIG. 2 is a perspective view showing an outline of a variable region laser displacement meter 11. It is.
  • 11 is a variable displacement laser displacement meter
  • 16 is a displacement meter control means
  • 21 is a forming drum
  • 22 is a drum rotating device
  • 23 is an encoder
  • 24 is a forming drum control device
  • 25 is a shape measuring means. .
  • the molding drum 21, the drum rotating device 22, and the encoder 23 are formed by laminating a belt-shaped tire constituent member such as a carcass ply, a belt, and a tread on the peripheral surface of the molding drum 21 in order and molding the raw tire. It is a component of the machine.
  • the variable region laser displacement meter 11 includes four laser devices 121 to 124, four optical element groups 131 to 134, one imaging unit 14, and the like.
  • the displacement amount measuring means 15 is provided.
  • the laser device 12 (121 to 124) irradiates the surface of a belt-shaped tire constituent member (hereinafter referred to as a belt-shaped member) 40, which is an object to be measured, with a line beam extending in a direction parallel to the longitudinal direction of the belt-shaped member 40. To do.
  • the optical element group 131 includes a collimator lens 13a, a beam splitter 13b, first and second Powell lenses 13c and 13d, an orthogonal light reflecting mirror 13r, and first and second transmission diffraction gratings 13p and 13q. , First and second reflected light reflecting mirrors 13m and 13n, and a prism 13z.
  • the optical element groups 132, 133, and 134 also have the same configuration as the optical element group 131.
  • the prism 13z is shared by the optical element groups 131 to 134.
  • the collimator lens 13a is disposed at the focal point of the laser beam irradiated by the laser device 12, and converts the laser beam from a laser element (not shown) into a parallel beam.
  • the beam splitter 13b has an internal reflection surface, and separates the laser light emitted from the collimator lens 13a into transmitted light and orthogonal light reflected by the internal reflection surface and emitted in a direction orthogonal to the transmitted light.
  • the first and second Powell lenses 13c and 13d are respectively disposed on the optical path of the transmitted light and the optical path of the orthogonal light separated by the beam splitter 13b, and transmit the transmitted light and the orthogonal light having a Gaussian intensity distribution. Is converted into laser light having a substantially uniform intensity distribution.
  • the first transmission type diffraction grating 13p diffracts and separates the laser beam (transmitted light) from the first Powell lens 13c into three laser beams of a 0th order beam, a + 1st order beam, and a ⁇ 1st order beam. And exit.
  • the second transmission type diffraction grating 13q diffracts the laser beam (orthogonal beam) from the second Powell lens 13d into three laser beams of the 0th order beam, the + 1st order beam, and the ⁇ 1st order beam. Separated and emitted.
  • the three laser beams (transmitted light) separated and diffracted by the first transmission type diffraction grating 13p are directly applied to the surface of the band-shaped member 40.
  • These three transmitted lights are all line-shaped laser light that spreads in a curtain shape in the direction extending in the longitudinal direction of the belt-like member 40, as indicated by T1 to T3 in FIG.
  • the orthogonal light reflecting mirror 13r reflects the three orthogonal lights so that the three laser lights (orthogonal lights) separated and diffracted by the second transmission type diffraction grating 13p are irradiated on the surface of the belt-shaped member 40. To do.
  • These three orthogonal lights are all line-shaped laser light that spreads in a curtain shape in the direction extending in the width direction of the belt-like member 40, as indicated by R1 to R3 in FIG.
  • the first reflected light reflecting mirror 13m reflects the reflected light of the three transmitted lights reflected by the surface of the band-shaped member 40, and enters the imaging means 14 through the prism 13z.
  • the second reflected light reflecting mirror 13n reflects the reflected light of the three orthogonal lights reflected by the surface of the belt-shaped member 40, and enters the imaging means 14 through the prism 13z.
  • the imaging unit 14 includes a light receiving lens 14a and a CCD element 14b arranged in a matrix, and is a reflection image that is an image of an irradiation part on the surface of the band-shaped member 40 that is incident from the prism 13z in synchronization with a reference pulse signal described later. Shoot.
  • the displacement amount measuring means 15 measures the displacement amounts of the three laser lines extending in the longitudinal direction in the reflected image at each photographing time, and extends in the width direction of the belt-like member 40 photographed at each photographing time. Measure the displacement of the laser line of the book. The details of the displacement measuring means 15 will be described after the description of the displacement meter control means 16.
  • the displacement sensor 181 includes the laser device 121, the optical element group 131, the imaging unit 14, and the displacement amount measuring unit 15, and simultaneously measures displacement amounts at a plurality of locations in the width direction of the belt-shaped member 40. To do.
  • reference numerals 131A to 131D denote the collimator lens 13a, the beam splitter 13b, the Powell lenses 13c and 13d, and the orthogonal light, which are components related to the irradiation light of the laser light in the optical element groups 131 to 134, respectively.
  • This is an irradiation system optical element group component composed of a reflection mirror 13r and transmission diffraction gratings 13p and 13q.
  • the displacement sensor 181 and the displacement sensor 182 are respectively arranged on both sides of the imaging means 14, the displacement sensor 183 is on the right side of the displacement sensor 181 (on the opposite side to the imaging means 14), and the displacement sensor 184 is the displacement sensor. It was arranged on the left side of 182 (the side opposite to the imaging means 14).
  • the region variable correspondence type The shape can be measured over the entire width of the belt-like member 40 without moving the laser displacement meter 11.
  • a displacement sensor 181 and a displacement sensor 182 are provided.
  • the displacement sensor 183 and the displacement sensor 184 may be used.
  • the displacement sensor 181 and the displacement sensor 184 or the displacement sensor 182 and the displacement sensor 183 may be used.
  • the molding drum 21 is an expandable / contractable cylindrical member connected to the tip of the main shaft 21J of the molding machine.
  • the belt-like member 40 conveyed by the installed conveyance conveyor 31 is pressed against the molding drum 21 by the pressing roller 32 and is sequentially attached to the outer peripheral side surface thereof.
  • reference numeral 40 a is the starting end of the band-like member 40 that is attached to the molding drum 21.
  • the band-shaped member 40 attached to the molding drum 21 moves in the rotation direction of the molding drum 21 together with the molding drum 21.
  • the moving direction of the band-shaped member 40 is the longitudinal direction of the band-shaped member 40.
  • the length of the belt-like member 40 is substantially equal to the circumferential length of the molding drum 21, when the molding drum 21 further rotates, as shown in FIG. 4B, the start end 40a and the terminal end 40b of the belt-like member 40 are predetermined.
  • a joint portion 40c that is overlapped by length and joined (overlap joint) is formed.
  • it may join together and join (butt joint) so that there may be no clearance gap between the start end 40a and the termination
  • the drum rotating device 22 includes a driving motor 22b connected to a main shaft 21J via a transmission 22a, and rotates the main shaft 21J, which is a rotating shaft of the molding drum 21, at a predetermined speed.
  • the encoder 23 is a rotational position detection sensor that detects the rotation of the main shaft 21J, detects the rotational position of the molding drum 21, and outputs a pulse signal every time the molding drum 21 rotates by a predetermined angle ⁇ .
  • ⁇ a rotational position detection sensor that detects the rotation of the main shaft 21J, detects the rotational position of the molding drum 21, and outputs a pulse signal every time the molding drum 21 rotates by a predetermined angle ⁇ .
  • an AB phase output type rotary encoder is used as the encoder 23, but an ABZ phase output type rotary encoder may be used.
  • the molding drum controller 24 compares the pulse interval of the pulse signal from the encoder 23 with a preset drum rotation speed, and drives the driving motor 22b to rotate the molding drum 21 along a
  • the displacement meter control means 16 alternately turns on two of the four laser devices 121 to 124 based on the pulse signal from the encoder 23 and controls the photographing timing of the imaging means 14.
  • the molding drum 21 rotates at a low speed at the beginning of winding as shown in the time chart of FIG. Shift to rotation (steady operation).
  • a pulse signal is output from the encoder 23 every time the molding drum 21 rotates by a predetermined angle ⁇ , as shown in FIG.
  • the pulse interval of this pulse signal is wide at the start of winding during acceleration and at the end of winding during deceleration, and is narrow during steady operation.
  • a modulation type PLL circuit is provided in the displacement meter control means 16 to generate a pulse signal obtained by modulating the synchronization signal as shown in FIG.
  • the modulated pulse signal is a signal for alternately lighting two laser devices used for measurement of the belt-like member 40 and controlling the time timing of photographing by the imaging means 14.
  • the modulated pulse signal is referred to as a reference pulse signal.
  • This reference pulse signal is sent to the laser device 12 and the imaging means 14.
  • the pulse interval of the reference pulse signal is set short when the rotational speed of the molding drum 21 is low and long when the rotational speed is high.
  • the pulse interval is fine when the molding drum 21 is accelerated or decelerated, such as at the start or end of winding. Sampling can be performed. Therefore, it is possible to photograph with high resolution the peripheral portion of the joint portion indicated by the time region S shown in FIG. 5C and the peripheral portion of the joint portion indicated by the time region F. Therefore, it is possible to accurately measure the step shift at the joint portion of the belt-shaped member 40. On the other hand, during constant speed rotation that does not require high measurement accuracy, rough sampling results, so that the processing time can be shortened and the burden on the apparatus can be reduced. In addition, since the two laser devices used for measurement are alternately turned on, the laser beams from the two laser devices do not interfere with each other.
  • the displacement measuring unit 15 includes a storage unit 15a, a laser line extraction unit 15b, an interpolation unit 15c, and a measurement unit 15d.
  • Storage means 15a stores and stores a reflection image of the belt-shaped member 40 taken by the imaging means 14 for each imaging time t k. As shown in FIG. 6, when a curtain-like laser beam is irradiated to the step 40 ⁇ / b> D on the surface of the belt-like member 40 from the laser device 121 (not shown) at the photographing time t k , a portion close to the laser device 121, that is, the convex portion 41.
  • the direction of the reflected light differs between the reflected light from and the reflected light from the far part, that is, the recessed part 42. Therefore, the reflected image that is a captured image of the imaging unit 14 is a line bent at the step 40D (hereinafter referred to as a laser line). Specifically, the reflected images of the laser beams T1 to T3 spreading in the direction extending in the longitudinal direction of the belt-like member 40 are all bent because they are irradiated to the convex portion 41 and the concave portion 42.
  • the reflected images of the laser beams R1 to R3 extending in the direction extending in the width direction of the belt-like member 40 are bent because the laser beam R1 and the laser beam R2 are irradiated on the convex portion 41 and the concave portion 42.
  • the laser beam R3 is not bent because it is applied only to the recess 42. Therefore, the amount of displacement of the surface of the belt-like member 40 can be measured from the amount of bending of the laser line using a known triangulation method.
  • the laser light from the laser device 122 is applied to the surface of the belt-shaped member 40. Therefore, if the laser light from the laser device 121 is applied to the right half of the belt-shaped member 40, the memory is stored.
  • the reflected image of the left half of the belt-like member 40 is stored in the means 15a.
  • the coordinates of the intersections of the longitudinal laser lines t1 to t3 and the widthwise laser lines r11 to r13 are obtained, and the longitudinal laser line t1 between the two adjacent widthwise laser lines r12 and r13 is obtained. Interpolate ⁇ t3.
  • the three laser lines r21 to r23 in the width direction measured at the next photographing time t k + 2 are read out, and the interpolated longitudinal laser lines t1 to t3 are read out.
  • the coordinates of the intersection point with the laser beam are obtained, and the longitudinal laser lines t1 to t3 between the adjacent two laser lines r12 and r13 in the width direction are further interpolated from the coordinates of the intersection point.
  • the measuring means 15d measures the displacement amounts h 11 (y), h 12 (y), and h 13 (y) of the three interpolated laser lines in the longitudinal direction shown in FIG.
  • the laser line extraction unit 15b, the interpolation unit 15c, and the measurement unit 15d perform the same operation on the laser line by the laser beam from the laser device 122, and the displacement amount of the left three longitudinal laser lines. h 21 (y), h 22 (y), and h 23 (y) are measured.
  • the profile of the band-shaped member 40 is measured over the entire width of the band-shaped member 40 by being connected in the longitudinal direction of 40.
  • the displacement sensor 181 and the displacement sensor 182 of the region-variable laser displacement meter 11 are used.
  • the displacement sensor 183 and the displacement sensor 184 are in the OFF state.
  • the belt-like member 40 conveyed to the upper part of the molding drum 21 by the conveyor 31 that runs at the same speed as the rotation speed of the molding drum 21 is pressed by the pressing roller 32. Affix sequentially on the peripheral surface.
  • the belt-like member 40 sequentially attached on the peripheral surface of the molding drum 21 moves in the longitudinal direction while being bent in an arc shape as the molding drum 21 rotates.
  • a pulse signal is sent from the encoder 23 to the displacement meter control means 16.
  • this pulse signal is subjected to PLL conversion in accordance with the rotational speed of the molding drum 21, and the laser devices 121 and 122 are alternately turned on and a reference pulse signal for controlling the photographing timing of the imaging means 14 is created. Then, it is sent to the laser displacement meter 11 corresponding to the region variable.
  • the displacement sensor 181 and the displacement sensor 182 are used to measure the displacement amount in the thickness direction of the belt-shaped member 40.
  • the laser device 121 and the laser device 122 are alternately turned on, and an imaging unit is used to capture the reflected image of the laser beam of the laser device 121 and the reflected image of the laser beam of the laser device 122 irradiated on the surface of the belt-shaped member 40.
  • the data is stored and stored in the storage unit 15 a provided in the displacement measuring unit 15, and the band-shaped member 40 is stored using the laser line extracting unit 15 b, the interpolation unit 15 c, and the measuring unit 15 d.
  • the displacement amount in the thickness direction is measured, and the measured displacement amount data is sent to the shape measuring means 25.
  • the radial direction of the molding drum 21 which is the thickness direction of the band-shaped member 40 is the z-axis direction
  • the width direction of the band-shaped member 40 is the x-direction
  • the direction of the circumferential vector on the surface of the band-shaped member 40 is y.
  • the surface of the belt-shaped member 40 is irradiated with laser light spreading in a curtain shape extending in the y direction from the laser device 121.
  • the irradiated laser light is converted into parallel rays by the collimator lens 13a, and then enters the beam splitter 13b to be separated into transmitted light and orthogonal light.
  • the transmitted light passes through the beam splitter 13b, advances straight in the z-axis direction, is guided to the first Powell lens 13c, and is converted into laser light having a uniform intensity distribution by the first Powell lens 13c. 1 is incident on the transmission diffraction grating 13p.
  • the orthogonal light is reflected in the y-axis direction by the beam splitter 13b, guided to the second Powell lens 13d, and converted into laser light having a uniform intensity distribution by the second Powell lens 13d. Incident on the transmissive diffraction grating 13q.
  • the transmitted light is diffracted and separated into three laser beams of the 0th order beam, the + 1st order beam, and the ⁇ 1st order beam by the first transmission type diffraction grating 13p.
  • the zero-order beam which is transmitted light, goes straight in the z-axis direction and is irradiated on the surface of the band-shaped member 40.
  • the + 1st order beam and the ⁇ 1st order beam which are diffracted lights, are diffracted in the (+) direction and the ( ⁇ ) direction of the x-axis, and are irradiated on the surface of the band-shaped member 40.
  • the surface of the belt-like member 40 is irradiated with three laser beams T1 to T3 extending in the longitudinal direction of the belt-like member 40 at a predetermined interval in the width direction (x-axis direction) of the belt-like member 40. Will be.
  • the orthogonal light is diffracted and separated into three laser beams of the 0th order beam, the + 1st order beam, and the ⁇ 1st order beam by the second transmission diffraction grating 13q, and then reflected by the orthogonal light reflection mirror 13r.
  • the surface of the belt-shaped member 40 is irradiated. Therefore, the surface of the band-shaped member 40 is irradiated with three laser beams each extending in the width direction of the band-shaped member 40 at a predetermined interval in the longitudinal direction of the band-shaped member 40. As a result, the surface of the belt-shaped member 40 is irradiated with three lattice-shaped laser beams extending from the laser device 121 in the longitudinal direction and the width direction of the belt-shaped member 40.
  • the direction of the reflected light of the transmitted light reflected by the surface of the band-shaped member 40 is different from the direction of the reflected light of the orthogonal light.
  • the reflected light of the transmitted light is reflected by the first reflected light reflecting mirror 13m, and enters the imaging means 14 via the prism 13z.
  • the reflected light of the orthogonal light is reflected by the second reflected light reflecting mirror 13n and is incident on the imaging means 14 via the prism 13z.
  • the imaging unit 14 captures a reflected image of three lattice-like laser beams extending in the longitudinal direction and the width direction of the strip member 40 irradiated on the surface of the strip member 40. If a reflection mirror or a lens for adjusting the optical path is disposed between the transmission type diffraction gratings 13p and 13q and the band member 40, and between the band member 40 and the first and second reflection light reflection mirrors 13m and 13n. The reflected image can be taken more clearly.
  • the laser device 121 and the laser device 122 are alternately turned on, so that the reflected image of the laser beam from the region including one end in the width direction of the band-shaped member 40 and the region including the other end are used.
  • a reflected image of the laser beam is taken every measurement time.
  • the photographed reflected image becomes a bent laser line as shown in the upper right diagram of FIG. 6, a step 40 ⁇ / b> D exists on the surface of the belt-shaped member 40. That is, it can be seen that the displacement amount h (y) changes.
  • the position of the step 40 ⁇ / b> D indicates the position of the starting end 40 a of the belt-like member 40. If both the convex portion 41 and the concave portion 42 are the band-like members 40, the position of the step 40D indicates the position of the terminal end 40b. Since the displacement sensor 181 irradiates the surface of the belt-like member 40 with three lattice-like laser beams extending in the longitudinal direction and the width direction of the belt-like member 40, the photographed image of the imaging means 14 is shown in FIG.
  • a line pattern extending in the longitudinal direction of the belt-like member 40 and a line extending in the width direction are crossed.
  • the bent portion of the lattice pattern is the position of the step, and the bending amount is the displacement amount.
  • the operation of the displacement sensor 182 is the same as that of the displacement sensor 181.
  • the laser device 121 and the laser device 122 are alternately turned on, so that the reflected image of the laser beam from the region including one end in the width direction of the band-shaped member 40 and the region including the other end are used.
  • a reflected image of the laser beam is taken at every measurement time, and data of the taken reflected image is sent to the displacement amount measuring means 15.
  • the displacement amount measuring means 15 measures the displacement amount in the thickness direction of the belt-shaped member 40 from the photographed reflection image, and sends the measured data to the shape measuring means 25.
  • the displacement amount data sent from the displacement amount measuring unit 15 is connected in the longitudinal direction of the strip member 40, and the profile of the strip member 40 is measured over the entire width of the strip member 40.
  • belt-shaped member 40 can be measured correctly from the coordinates of the starting end 40a and the coordinates of the terminal end 40b.
  • the first step portion is the position of the starting end 40a, and the increase in the displacement amount at the first step portion corresponds to the thickness of the strip-like member 40.
  • the displacement amount further increases in the vicinity of the end 40b, A second step portion in which the displacement amount suddenly decreases at the position appears, and an increase in the displacement amount in the vicinity of the terminal end 40b corresponds to an overlapping portion in the joint portion 40c of the strip member 40, and the position of the second step portion is the position of the second step portion.
  • Terminal 40b Is a position. Therefore, from the graph showing the relationship between the output pulse number of the encoder and the displacement shown in FIG. 8B, the pulse number P S indicating the position coordinate of the start end 40a and the pulse number P E indicating the position coordinate of the end end 40b. And the joint amount J of the belt-like member 40 can be calculated.
  • A is a coefficient for converting the number of pulses into the drum position.
  • a threshold value K is set in advance with respect to the magnitude of the displacement amount, and when the displacement amount exceeds the threshold value K, the belt-like member 40 is folded or wrinkled abnormally. Can be determined. Therefore, the inspection of the joint amount of the belt-like member 40, the wrinkle abnormality, the step shift, the opening of the joint portion, and the like can be accurately performed.
  • the length measurement in the width direction of the belt-like member 40 can be performed without providing a moving mechanism.
  • decomposability of a longitudinal direction can be improved. That is, the shape in the width direction and the shape of the joint portion can be simultaneously measured with high resolution.
  • fine sampling is performed when the molding drum 21 rotates at a low speed, and rough sampling is performed when the molding drum 21 rotates at a high speed. Can be taken with high resolution. Therefore, the start end 40a and the end end 40b of the belt-like member 40 can be measured with high accuracy.
  • the use example of the shape measuring device of the present invention is not limited to this, For example, shape measurement and shape inspection of a belt-shaped member moved by a conveyor, such as length measurement of a belt-shaped rubber member such as a tread that is extruded from an extruder and transported after being cut into a regular shape.
  • the measurement object of the present invention is not limited to the belt-like member 40 such as a carcass ply, a sidewall, a belt, or a tread, but also to other belt-like members such as a film or other belt-like members such as a sheet. Applicable.
  • one curtain-like laser beam extending in the longitudinal direction of the belt-like member 40 is converted into the beam splitter 13b, the orthogonal light reflecting mirror 13r, and the first and second transmissive diffraction gratings 13p and 13q.
  • the displacement sensors 181 to 184 that divide and irradiate each of the three lattice-like laser beams extending in the longitudinal direction and the width direction of the belt-like member 40 have been described.
  • the beam splitter 13b and the orthogonal light reflecting mirror are described.
  • By omitting 13r it is also possible to produce a displacement sensor that separates and irradiates one laser beam into three laser beams extending in the longitudinal direction of the belt-shaped member 40.
  • the displacement sensor that irradiates the laser beam separated into three laser beams extending in the width direction of the belt-shaped member 40 even if the orthogonal light reflecting mirror 13r is omitted. Can also be produced.
  • the laser beam from the laser device 121 is separated into six laser beams using the beam splitter 13b and the transmissive diffraction gratings 13p and 13q, and the surface of the belt-shaped member 40 is irradiated with the laser beam.
  • the laser beam 12 ⁇ / b> Z including three laser elements (laser diodes) 12 a to 12 c may be used to irradiate the strip-shaped member 40 with six laser beams.
  • Laser light from the laser diodes 12a to 12c enters the beam splitter 13b through the collimator lens 13a, and is separated into transmitted light and orthogonal light by the beam splitter 13b.
  • the transmitted light is converted into laser light having a substantially uniform intensity distribution by the first Powell lens 13c and irradiated on the surface of the belt-shaped member 40.
  • the laser beams become three laser beams extending in the longitudinal direction of the belt-like member 40 as shown by the solid line in FIG.
  • the orthogonal light is converted by the second Powell lens 13d into a laser beam having a substantially uniform intensity distribution after the transmitted light and the orthogonal light having a Gaussian intensity distribution are reflected by the orthogonal light reflecting mirror 13r.
  • the surface of the belt-shaped member 40 is irradiated. This laser light becomes three laser lights extending in the width direction of the belt-like member 40 as shown by a one-dot chain line in FIG.
  • an image rotator 19 is provided between the beam splitter 13b and the second Powell lens 13d.
  • the image rotator 19 is also called a trapezoidal prism, and adjusts the irradiation position of the transmitted light by making the transmitted light (parallel light) that has passed through the beam splitter 13b incident, totally reflected, and emitted in the original incident direction. .
  • the optical system that guides the reflected light from the surface of the belt-like member 40 to the imaging means 14 is the same as that in the above-described embodiment, and a description thereof will be omitted.
  • the shape of the belt-shaped member can be easily and accurately measured with a simple configuration. Therefore, the shape of the tire structural member such as the length measurement of the belt-shaped member, the joint amount, and the three-dimensional shape measurement can be used. If applied to inspection, shape inspection can be performed efficiently and inspection accuracy can be improved.
  • Tire shape member shape measuring device 11 Laser displacement meter with variable area, 121-124 laser device, 131-134 optical element group, 13a collimator lens, 13b beam splitter, 13c, 13d Powell lens, 13r orthogonal light reflecting mirror, 13p, 13q transmissive diffraction grating, 13m, 13n reflected light reflecting mirror, 13z prism, 14 imaging means, 15 displacement measuring means, 15a storage means, 15b laser line extraction means, 15c interpolation means, 15d measurement means, 16 displacement meter control means, 181-184 displacement sensor, 21 molding drum, 22 drum rotating device, 23 encoder, 24 molding drum control device, 25 shape measuring means, 31 Conveyor, 32 Pressing roller, 40 Band-shaped member, 40a start end, 40b end.

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  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un procédé visant à mesurer les quantités de décalage dans des positions multiples, parmi lesquelles une position d'extrémité d'un élément en forme de bande, sans augmenter le nombre de caméras, et à mesurer de manière efficiente la forme de l'élément en forme de bande, ainsi qu'un dispositif à cet effet. Plus précisément, l'invention concerne un dispositif de mesure de forme d'éléments en forme de bande qui est muni d'une unité laser (121) servant à appliquer un faisceau laser s'étendant suivant la direction longitudinale d'un élément (40) en forme de bande à la surface de l'élément en forme de bande, un moyen (14) de capture d'image servant à capturer une image réfléchie du faisceau laser, et un moyen (15) de mesure de la quantité de décalage servant à mesurer la quantité de décalage de l'élément (40) en forme de bande à partir de l'image réfléchie, et qui mesure la forme de la surface d'un élément en forme de bande sur la base de la quantité de décalage de l'élément (40) en forme de bande mesurée par le moyen (15) de mesure de la quantité de décalage. Les quantités de décalage à des positions multiples dans la direction transversale de l'élément (40) en forme de bande sont mesurées en séparant par diffraction le faisceau laser appliqué en un faisceau transmis et un faisceau diffracté et en appliquant des faisceaux laser multiples (T1-T3) séparés les uns des autres dans la direction transversale de l'élément en forme de bande à l'élément (40) en forme de bande.
PCT/JP2011/061072 2010-05-14 2011-05-13 Procédé de mesure de forme pour élément en forme de bande, et dispositif à cet effet WO2011142462A1 (fr)

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EP2745945A1 (fr) * 2012-02-20 2014-06-25 Salzgitter Mannesmann Grobblech GmbH Procédé et dispositif destinés à la mesure géométrique sans contact d'un objet de mesure
WO2017046832A1 (fr) * 2015-09-18 2017-03-23 Hamamatsu Photonics K.K. Système de mesure de distance optique
CN110174060A (zh) * 2019-06-13 2019-08-27 正新橡胶（中国）有限公司 一种胎体帘布量测系统以及测量方法

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JP6370142B2 (ja) * 2014-07-23 2018-08-08 株式会社ブリヂストン 重なり量測定装置及び重なり量測定方法

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JPH06323817A (ja) * 1993-05-14 1994-11-25 Yokohama Rubber Co Ltd:The タイヤトレッド長さ測定方法
JP2001242091A (ja) * 2000-01-07 2001-09-07 Thermo Radiometrie Oy 表面検査のための方法及び装置
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WO2017046832A1 (fr) * 2015-09-18 2017-03-23 Hamamatsu Photonics K.K. Système de mesure de distance optique
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CN110174060A (zh) * 2019-06-13 2019-08-27 正新橡胶（中国）有限公司 一种胎体帘布量测系统以及测量方法

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