WO2011142462A1

WO2011142462A1 - Band-shaped member shape measuring method, and device therefor

Info

Publication number: WO2011142462A1
Application number: PCT/JP2011/061072
Authority: WO
Inventors: 伸也岩山
Original assignee: 株式会社ブリヂストン
Priority date: 2010-05-14
Filing date: 2011-05-13
Publication date: 2011-11-17
Also published as: JP2011242176A

Abstract

In order to provide a method for measuring the amounts of displacement at multiple positions including an end position of a band-shaped member without increasing the number of cameras and efficiently measuring the shape of the band-shaped member, and a device therefor, specifically disclosed is a band-shaped member shape measuring device which is provided with a laser unit (121) for applying a laser beam extending along the longitudinal direction of a band-shaped member (40) to the surface of the band-shaped member, an image capturing means (14) for capturing a reflected image of the laser beam, and a displacement amount measuring means (15) for measuring the amount of displacement of the band-shaped member (40) from the reflected image, and measures the surface shape of a band-shaped member on the basis of the amount of displacement of the band-shaped member (40) measured by the displacement amount measuring means (15). The amounts of displacement at multiple positions in the width direction of the band-shaped member (40) are measured by separating the applied laser beam into a transmitted beam and a diffracted beam by diffraction and applying multiple laser beams (T1-T3) apart from each other in the width direction of the band-shaped member to the band-shaped member (40).

Description

Method and apparatus for measuring shape of belt-shaped member

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.

Conventionally, as an apparatus for measuring the length of a belt-shaped tire component member, 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.

By the way, in the length measuring device for the belt-like rubber member, since the one-dimensional laser sensor whose irradiation area has a predetermined spot diameter is used as the displacement sensor 72, the measurement at an arbitrary position in the width direction of the belt-like rubber member 70L. I couldn't be long.
Therefore, in order to solve this problem, the present applicant has proposed a belt-shaped member length measuring device using a two-dimensional displacement sensor as the displacement sensor. (For example, refer to Patent Document 2).
Specifically, as shown in FIGS. 11A and 11B, 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.

Specifically, 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.
At this time, 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.

JP 2003-28630 A WO 2006/019070 A1

By the way, in 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. However, it is not only difficult to attach four two-dimensional displacement sensors in the width direction of the molding drum 82 due to space requirements, but increasing the number of two-dimensional displacement sensors increases the number of expensive cameras. There is a problem that the device becomes expensive.
In the two-dimensional displacement sensor, since the measurement object parallel to the laser line light becomes a shadow of the thickness, the measurement accuracy is lowered, so it is difficult to measure the width measurement and the shape of the joint portion at the same time. Met.
Therefore, there is a need for a small and inexpensive strip-shaped member shape measuring device that can measure a plurality of measurement points with a small number of cameras, and simultaneously measure the length of the width and the shape of the joint portion. It was.

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. In a method for measuring the shape of a band-shaped member, which measures the amount of displacement of the surface of the member and measures the surface shape of the band-shaped member based on the measured amount of displacement, 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.
In this way, 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.

According to a second aspect of the present invention, there is provided 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. Based on an imaging means for capturing a reflected image of light, 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.

According to a third aspect of the present invention, in the belt-shaped member shape measuring apparatus according to the second aspect of the present invention, the laser beam from the laser apparatus is parallel light rays, which is disposed between the laser apparatus and the transmission diffraction grating. And 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. .
Thereby, the transmitted light and the diffracted light can be reliably separated and diffracted from the transmissive diffraction grating, and the reflected light from the belt-shaped member can be reliably imaged on the imaging means. Can be measured with higher accuracy.

According to a fourth aspect of the present invention, in the belt-shaped member shape measuring apparatus according to the second or third aspect, the belt-shaped member 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.
As a result, the displacement amount at a plurality of positions in the width direction can be measured alternately in different regions in the width direction of the band-shaped member, so that the shape of the band-shaped member can be accurately measured over a wide range in the width direction. it can.
Moreover, since the interference of the laser beams from the two laser devices can be avoided, the surface shape of the belt-shaped member can be measured with high accuracy.
In order to increase the width of the two regions in the width direction or to facilitate the arrangement of optical components such as a transmissive diffraction grating, 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.

According to a fifth aspect of the present invention, there is provided 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. A mirror that reflects in the direction of the member, and a mirror that reflects the reflected light of the transmitted light and the reflected light of the diffracted light, and focuses the reflected light on the imaging means, respectively, and the displacement measurement 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.
Thereby, since 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.

Note that even when a laser apparatus including a plurality of laser elements is used, it is possible to simultaneously measure displacement amounts at a plurality of positions in the width direction of the belt-shaped member with a single photographing apparatus. In this case, 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.

According to a sixth aspect of the present invention, in the belt-shaped member shape measuring apparatus according to any one of the second to fifth aspects, 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.
In general, when a long strip member is attached to a drum, 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. That is, the drum rotates at a low speed at the start and end of winding of the belt-shaped member.
In such a case, if 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.

Note that 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. An apparatus for measuring the shape of a belt-shaped member, etc., by imaging means for imaging and displacement amount measuring means for measuring displacement amounts at a plurality of locations of the subject from reflection images of a plurality of laser beams photographed by the imaging means It is possible to configure a displacement sensor that can be used for the same, and that can simultaneously measure the amount of displacement at a plurality of positions of the subject with a single imaging apparatus.

It should be noted that the summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

It is a figure which shows the outline | summary of the shape measuring apparatus of the tire structural member which concerns on embodiment of this invention. It is a perspective view which shows the outline | summary of the area | region variable type | mold laser displacement meter which concerns on this Embodiment. It is a figure for demonstrating the usage method of the area | region variable correspondence type laser displacement meter. It is a figure which shows the positional relationship of the strip | belt-shaped tire structural member affixed on the molding drum, and the area | region variable corresponding | compatible laser displacement meter. It is a figure which shows the time chart which shows the time change of the rotational speed of a shaping | molding drum, and the sampling method which is the timing of imaging | photography. It is a figure which shows the edge part measuring method using a two-dimensional displacement sensor. It is a figure which shows the measuring method of the displacement amount which concerns on this Embodiment. It is a figure which shows an example of the measuring method of displacement amount. It is a figure which shows the other structure of the displacement sensor by this invention. It is a figure which shows the edge part measuring method using the conventional one-dimensional displacement sensor. It is a figure which shows the edge part measuring method using the conventional two-dimensional displacement sensor.

Hereinafter, the present invention will be described in detail through embodiments, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

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, and FIG. 2 is a perspective view showing an outline of a variable region laser displacement meter 11. It is.
In each figure, 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, and 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.

As shown in FIGS. 2A and 2B, 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. In this example, four laser devices 121 to 124 and four optical element groups 131 to 134 are arranged at a distance from each other in the width direction of the belt-shaped member 40, and the four laser devices 121 to 124 are connected to each other. Two of them are turned on alternately to measure the surface shape of the belt-like member 40.
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 components of the optical element groups 131 to 134 will be described.
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. On the other hand, 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 according to the present invention 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. The laser device 12j (j = 2, 3, 4), the optical element group 13j (j = 2, 3, 4), the imaging unit 14, and the displacement amount measuring unit 15 are also included in the displacement sensor 18j (j = 2, 3). , 4).
That is, as shown in FIG. 3A, the variable region laser displacement meter 11 of this example includes four displacement sensors 181 to 184 that share the imaging means 14, the displacement amount measuring means 15, and the prism 13z. Will be. In the figure, 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.
In this example, 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).

In this example, since the two displacement sensors 181 to 184 of the four displacement sensors 181 to 184 are operated alternately, even if the size width of the belt-like member 40 to be measured is changed, 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.
Specifically, as shown in FIG. 3B, when measuring the surface shape of the band-like member 40S having a narrow width W (for example, W = 80 to 130 mm), a displacement sensor 181 and a displacement sensor 182 are provided. When the surface shape of the band-shaped member 40L having a wide width W (for example, W = 160 to 210 mm) is used, the displacement sensor 183 and the displacement sensor 184 may be used. Further, when measuring the surface shape of the band-shaped member 40M having an intermediate width, the displacement sensor 181 and the displacement sensor 184 or the displacement sensor 182 and the displacement sensor 183 may be used.

As shown in FIG. 1 and FIGS. 4A and 4B, 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.
In FIG. 4A, 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.
Since 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. In addition, as a joint part, it may join together and join (butt joint) so that there may be no clearance gap between the start end 40a and the termination | terminus 40b.

As shown in FIG. 1, 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 Δα. Are output to the molding drum control device 24 and the displacement meter control means 16, respectively. In this example, 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 predetermined time chart. ·Control.

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.
By the way, when the belt-like member 40 is attached to the molding drum 21, 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). Then, when the end of winding is approaching, it is decelerated, and when it ends, it stops. At this time, a pulse signal is output from the encoder 23 every time the molding drum 21 rotates by a predetermined angle Δθ, as shown in FIG. As shown in FIG. 5B, 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.

However, in the measurement of the belt-like member 40, measurement data at the start and end of winding is important.
In this example, 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. Hereinafter, 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. Therefore, 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.

Here, details of the displacement measuring means 15 will be described.
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. On the other hand, 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.
At the photographing time t _{k + 1} , 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.

Laser line extraction unit 15b from the reflected image of each imaging time t _k which is stored in the storage unit 15a, as shown in FIG. 7 (a), 3 pieces of longitudinal laser obtained by connecting the longitudinal direction of the belt-shaped member 40 Lines t1 to t3 are extracted. These laser lines t1 to t3 are laser lines (laser lines on the right side of the belt-like member 40) by the laser beams T1 to T3 from the laser device 121.
As shown in FIG. 7B, the interpolation unit 15c extracts the laser lines r11 to r13 by the laser beams R1 to R3 extending in the three width directions of the strip member 40 at the photographing time t _k from the storage unit 15a. In addition, 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. Next, as shown in FIG. 7C, 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.
In this example, the position where the displacement amount h (y) = 0 is the surface of the molding drum 21 when the belt-like member 40 is not attached, the surface of the molding drum 21, the imaging means 14, and the molding drum 21. It is set at the intersection with the line connecting the centers of.
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 shape measuring unit 25 includes a displacement amount h _1k (y) (k = 1 to 3) obtained from three laser lines extending in the longitudinal direction in the reflected image measured by the displacement amount measuring unit 15 of the displacement sensor 181. The displacement amounts h _2k (y) (k = 1 to 3) obtained from the three laser lines extending in the longitudinal direction in the reflected image measured by the displacement amount measuring means 15 of the displacement sensor 182 are respectively band-shaped members. 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.

Next, a method for measuring the surface shape of the belt-like member 40 using the shape measuring apparatus 10 of this example will be described. Here, the case where the displacement sensor 181 and the displacement sensor 182 of the region-variable laser displacement meter 11 are used will be described. The displacement sensor 183 and the displacement sensor 184 are in the OFF state.
First, as shown in FIG. 4A, 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.
Each time the molding drum 21 rotates by a predetermined angle Δα, a pulse signal is sent from the encoder 23 to the displacement meter control means 16. In 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.

In the region variable laser displacement meter 11, 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. Specifically, 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. 14, and 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.

Here, the operation of the displacement sensor 181 will be described.
As shown in FIG. 2, 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, and the direction of the circumferential vector on the surface of the band-shaped member 40 is y. Assuming that the direction is the direction, 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.
On the other hand, 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. On the other hand, 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. That is, 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.

Since the irradiation direction of the transmitted light is different from the irradiation direction of the orthogonal light, 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. On the other hand, 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.

In this example, 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.
When 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.
For example, in FIG. 6, if the convex portion 41 is the belt-like member 40 and the concave portion 42 is the surface of the molding drum 21, 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. As shown in the upper right figure, 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.

In this example, 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. At this time, it is preferable to arrange, for example, a liquid crystal electronic shutter in front of the prism 13z so that the reflected light of the laser device 121 and the reflected light of the laser device 122 do not interfere with each other.
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.
In the shape measuring unit 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.
Thereby, while being able to measure the three-dimensional shape of the starting end 40a and the terminal end 40b, the joint amount of the strip | belt-shaped member 40 can be measured correctly from the coordinates of the starting end 40a and the coordinates of the terminal end 40b.

Specifically, as shown in FIGS. 8A and 8B, the laser light from the laser device 121 and the laser device 122 laser light from the measurement start position (from the position where the number of pulses = 0 to the position of the start end 40a). Is reflected on the surface of the molding drum 21. Then, when each laser beam is irradiated onto the starting end 40a, a stepped portion in which the amount of displacement increases rapidly appears, and then the amount of displacement becomes substantially constant. 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. Then, 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. Here, if the number of pulses P ₀ per rotation of the forming drum 21 is set, the member length L of the belt-like member 40 is L = a (P _E −P _S ), and the joint amount J is J = a {(( P _E −P _S ) −P ₀ }. A is a coefficient for converting the number of pulses into the drum position. When J> 0, the lap joint is shown in this example, when J <0 is an open joint, when J = 0 is a butt joint. is there.
Further, it is possible to detect a case where the belt-shaped member 40 is folded or wrinkled abnormally from the change in the amount of displacement between the start end 40a and the end end 40b. That is, as shown in FIG. 8C, 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.

As described above, in this example, measurement is performed at six locations in the width direction of the belt-shaped member 40 by the variable region laser displacement meter 11 including the two

laser devices

121 and 122 and the one imaging unit 14. Therefore, the length measurement in the width direction of the belt-like member 40 can be performed without providing a moving mechanism. Moreover, since it can measure simultaneously also in three places of a longitudinal direction, the resolution | 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.
Furthermore, in this example, 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.

In the above embodiment, the case where the surface shape of the band-like member 40 attached to the peripheral surface of the molding drum 21 is measured has been described. However, 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. Can be used for
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.

In the above example, 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. However, 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.
If the spreading direction of the curtain-shaped laser beam is the width direction, 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.

In the above example, 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. As shown in FIG. 6, instead of the laser device 121, 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.
On the other hand, 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.

In this example, 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. .
As a result, it is possible to irradiate the surface of the band-shaped member 40 with three lattice-shaped laser beams extending in the longitudinal direction and the width direction of the band-shaped member 40.
Note that the optical system that guides the reflected light from the surface of the belt-like member 40 to the imaging means 14 (not shown) is the same as that in the above-described embodiment, and a description thereof will be omitted.

As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

According to the present invention, 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.

10. 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.

Claims

A laser device for irradiating the surface of the belt-shaped member with a laser beam extending along the longitudinal direction of the belt-shaped member and the reflected light of the laser beam from the belt-shaped member is received and a reflected image of the laser beam is photographed Taking a reflected image of the laser beam while moving it relatively in the longitudinal direction of the belt-like member, and measuring a displacement amount of the surface of the belt-like member from the photographed reflected image, In the method for measuring the shape of the band-shaped member that measures the surface shape of the band-shaped member based on the measured displacement amount,
Laser light emitted from the laser device is diffracted and separated into transmitted light and diffracted light using a transmission diffraction grating, and the transmitted light separated from each other in the width direction of the belt-shaped member on the surface of the belt-shaped member A plurality of laser beams composed of the diffracted light are irradiated, and displacement amounts at a plurality of positions in the width direction of the belt-shaped member are measured from the reflected image of the transmitted light and the reflected image of the diffracted light. A method for measuring the shape of a band-shaped member.
Laser apparatus for irradiating the surface of the belt-shaped member with laser light extending along the longitudinal direction of the belt-shaped member, and imaging means for receiving a reflected light of the laser light from the belt-shaped member and photographing a reflected image of the laser light A displacement amount measuring means for measuring the displacement amount of the belt-shaped member from the reflected image, and a shape for measuring the surface shape of the belt-shaped member based on the displacement amount of the belt-shaped member measured by the displacement amount measuring means A strip-shaped member shape measuring apparatus comprising measuring means and moving means for moving the strip-shaped member relative to the laser device and the imaging means in the longitudinal direction of the strip-shaped 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 belt-shaped member. The transmitted light and the diffracted light separated from each other in the width direction of the belt-shaped member Comprising a transmissive diffraction grating that emits a plurality of laser beams consisting of
The displacement measuring means measures a displacement at a plurality of locations in the width direction of the belt-like member from the reflected image of the transmitted light and the reflected image of the diffracted light taken by the imaging means. Member shape measuring device.
A collimator lens disposed between the laser device and the transmissive diffraction grating to convert laser light from the laser device into parallel rays;
The belt-shaped member according to claim 2, further comprising a mirror that reflects the reflected light of the transmitted light and the reflected light of the diffracted light, and focuses the reflected light on the imaging unit. Shape measuring device.
The first and second displacement measuring devices, which have the laser device, the transmission type diffraction grating, and the displacement measuring means, are spaced apart from each other in the width direction of the belt-shaped member, and the first 4. The belt-shaped member according to claim 2, further comprising an irradiation light control unit that alternately turns on the laser device of the displacement measuring device and the laser device of the second displacement measuring device. 5. Shape measuring device.
A laser device that irradiates the surface of the belt-shaped member with laser light extending along the longitudinal direction or the width direction of the belt-shaped member, and receives a reflected light of the laser light from the belt-shaped member to photograph a reflected image of the laser light Imaging means, displacement amount measuring means for measuring the displacement amount of the belt-like member from the reflected image, and the surface shape of the belt-like member based on the displacement amount of the belt-like member measured by the displacement amount measuring means. A shape measuring device for a band-shaped member comprising shape measuring means for measuring, and moving means for moving the band-shaped member relative to the laser device and the imaging means in the longitudinal direction of the band-shaped member,
A collimator lens that converts laser light from the laser device into parallel light rays;
A beam splitter that passes a part of the laser light emitted from the collimator lens and reflects the remaining laser light to emit in a direction perpendicular to the incident direction;
A first transmissive diffraction grating that diffracts and separates laser light 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;
A mirror that reflects the transmitted light and diffracted light emitted from the second transmissive diffraction grating in the direction of the band-shaped member;
A mirror that reflects the reflected light of the transmitted light and the reflected light of the diffracted light, respectively, and focuses the reflected light on the imaging means, respectively.
The displacement measuring means includes a plurality of displacement amounts in the width direction and a plurality of displacement amounts 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 measuring the shape of the belt-like member.
A photographing control means for controlling the photographing timing of the imaging means;
The shooting control means
3. The imaging unit is controlled such that a shooting interval at the time of acceleration / deceleration of a moving speed of the belt-shaped member with respect to the laser device and the imaging unit is shorter than a shooting interval when the moving speed is constant. The shape measuring apparatus for a band-shaped member according to any one of claims 5 to 6.