JP2018013331A - Inspection method of prickling hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method which detects a prickling hole of a rubber member with high accuracy.SOLUTION: In an inspection method of a prickling hole, a large number of prickling holes are formed on a surface 4a of a rubber member 4. The inspection method includes: an image data acquisition step of photographing a surface 4a of a rubber member 4 with a camera 40 to obtain image data; a hole detection step of detecting a prickling hole from the image data by a control device 44; and a hole number counting step of counting the number of prickling holes by a control device 44. Preferably, in the image data acquisition step, the prickling hole, from a rear face 4b to the surface 4a of the rubber member 4, is irradiated with an illumination 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for inspecting a priking hole formed in a rubber member.

  The tire is obtained by vulcanizing a raw cover (raw tire). This raw cover is formed by laminating rubber members constituting each part. Since this raw cover is formed by laminating a plurality of members, an air pocket may be generated between the rubber members. This air pocket reduces the durability and uniformity of the resulting tire.

  In the manufacturing method disclosed in JP 2013-163313 A, a precucking hole is formed in the rubber member. The air between the laminated rubber members is exhausted from the priking hole. By forming the prepicking hole, the occurrence of air accumulation is suppressed. This manufacturing method can suppress a decrease in tire durability and uniformity.

JP 2013-163313 A

  Conventionally, this kind of pre-checking hole has been visually inspected by an operator. Although this visual inspection can determine the presence or absence of the precricking holes, it is difficult to accurately specify the number of precricking holes.

  An object of the present invention is to provide an inspection method for detecting a precricking hole of a rubber member with high accuracy.

  In the method for inspecting a precricking hole according to the present invention, a camera and a control device are prepared. In this inspection method, a large number of wicking holes are formed on the surface of the rubber member. The inspection method includes an image data acquisition step of obtaining image data by photographing the surface of the rubber member with the camera, a hole detection step in which the control device detects the priking hole from the image data, and the control device. Is provided with a hole number counting step for counting the number of the prepicking holes.

  Preferably, in the image data acquisition step, illumination illuminates the priking hole from the back surface to the front surface of the rubber member. More preferably, the wavelength of the illumination light is 570 (nm) or more.

  The rubber member may be formed by bonding an end of one member piece and an end of another member piece. Preferably, this inspection method includes a deviation amount detection step. In this shift amount detection step, the shift amount in the width direction of the bonding position of the rubber member is detected from the image data. The deviation detection step includes a contour acquisition step in which the control device acquires a contour of the end in the width direction of the rubber member from the image data, and a contour reference line extraction step in which the control device calculates a contour reference line from the contour. The control device includes a contour difference calculating step of calculating a width direction difference between the contour and the contour reference line. In the shift amount detection step, the difference in the width direction between the contour and the contour reference line is calculated for one and the other in the width direction of the rubber member.

  Preferably, the hole detection step includes a step of setting a plurality of hole search ranges in the image data, and a step of detecting a pricking hole in the hole search range.

  Preferably, in the step of setting the hole search range, a reference plicking hole is detected from the image data. Based on the position of the reference priming hole, the hole search range of other prepicking holes is set.

  The precricking hole inspection apparatus according to the present invention includes a camera for photographing the surface of a rubber member having a large number of preprick holes formed on the surface, and a control device. The control device has a function of acquiring image data photographed by the camera, a function of detecting precricking holes from the image data, and a function of counting the number of detected prepicking holes.

  The tire manufacturing method according to the present invention includes a pre-packing step in which a large number of pre-packing holes are formed on the surface of the rubber member, an image data acquisition step of obtaining image data by photographing the surface of the rubber member with a camera, A hole detecting step in which the control device detects the prepricking hole from the image data; a hole number counting step in which the control device counts the number of the prepricking holes detected; and the rubber member is connected to another rubber member. A pre-molding step in which a raw cover is obtained by being laminated; and a vulcanizing step in which the raw cover is vulcanized to obtain a tire.

  In the inspection method according to the present invention, the piercing hole inspection device counts the number of printing holes. This inspection method can accurately grasp the number of precricking holes. The tire manufacturing method including this inspection method can guarantee the number of precricking holes as a numerical value. This tire manufacturing method can improve the quality of the tire.

FIG. 1 is a conceptual diagram illustrating a manufacturing facility for an inspection method according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating the precicking apparatus of the manufacturing facility of FIG. FIG. 3 is a perspective view showing the precricking hole inspection apparatus of the manufacturing facility of FIG. FIG. 4 is a plan view showing a part of the rubber member in which the pre-kking hole is formed. FIG. 5 is a flowchart of the precricking hole inspection method according to the present invention. FIG. 6 is a flowchart of a deviation amount detection step of the piercing hole inspection method of FIG. FIG. 7 is a plan view showing a part of the rubber member in which the precricking hole is formed in another priming hole inspection method according to the present invention.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 shows a manufacturing facility 2 and a rubber sheet 4 as a rubber member. The manufacturing facility 2 includes a transport device 6, a priking device 8, and an inspection device 10 as a precricking hole inspection device. This rubber sheet 4 is, for example, a belt-like rubber member. The rubber sheet 4 is sent from the left to the right in FIG. Here, for the sake of convenience of explanation, the rightward direction in the left-right direction in FIG. 1 is described as the forward direction in the front-rear direction of the manufacturing facility 2, and the direction perpendicular to the paper surface in FIG.

  The transport device 6 includes, for example, a first belt conveyor 12, a second belt conveyor 14, and a roller conveyor 16. The transport device 6 has a function of transporting the rubber sheet 4 forward in the front-rear direction of the manufacturing facility 2.

  The first belt conveyor 12 includes a belt 12a, a driving roller 12b, and a driven roller 12c. The belt 12a is stretched between the driving roller 12b and the driven roller 12c. As the driving roller 12b rotates, the belt 12a is sent and the driven roller 12c rotates. The second belt conveyor 14 also includes a belt 14a, a driving roller 14b, and a driven roller 14c. The second belt conveyor 14 is configured in the same manner as the first belt conveyor 12.

  The roller conveyor 16 includes a plurality of rollers 16a. The plurality of rollers 16a are arranged at predetermined intervals in the front-rear direction. Each roller 16a is rotatable about the left-right direction as a rotation axis. The transport device 6 only needs to have a function of transporting the rubber sheet 4. The 1st belt conveyor 12, the 2nd belt conveyor 14, and the roller conveyor 16 are illustrations, Comprising: The conveying apparatus 6 is not restricted to these.

  As shown in FIG. 1 and FIG. 2, the priking device 8 includes a base plate 18, a cylinder 20 as a lift drive unit, a slide bar 22, a guide 24, a lift plate 26, a pressing plate 28, A slide pin 30, a spring 32, a cone 34, and a cradle 36 are provided. The prepicking device 8 forms a large number of prepicking holes 37 in the rubber sheet 4. The prepicking hole 37 passes through the rubber sheet 4.

  The base plate 18 is fixed above the transport device 6. A cylinder 20 and a guide 24 are attached to the base plate 18. The slide bar 22 is passed through the guide 24. The slide bar 22 is instructed to be movable in the vertical direction with respect to the base plate 18.

  The elevating plate 26 is attached to the rod of the cylinder 20. The lower end of the slide bar 22 is attached to the lifting plate 26. The lift plate 26 is supported so as to be movable in the vertical direction with respect to the base plate 18. A lower end portion of the slide pin 30 is attached to the holding plate 28. The slide pin 30 is passed through the guide hole of the elevating plate 26. The holding plate 28 and the slide pin 30 are supported so as to be movable in the vertical direction with respect to the elevating plate 26. A spring 32 is passed through the slide pin 30. The spring 32 urges the pressing plate 28 in a direction away from the lifting plate 26.

  A plurality of cones 34 are attached to the lift plate 26. These cones 34 are arranged at predetermined intervals in the front-rear direction and the left-right direction. The tip of each cone 34 is directed downward. A plurality of guide holes 35 are formed in the pressing plate 28. These guide holes 35 are formed according to the arrangement of the cones 34 in the front-rear direction and the left-right direction. Each guide hole 35 is formed so that the tip of the cone 34 can pass therethrough.

  The cradle 36 is disposed below the presser plate 28. The cradle 36 is located between the first belt conveyor 12 and the second belt conveyor 14 in the front-rear direction. The cradle 36 is opposed to the pressing plate 28 with the rubber sheet 4 being conveyed therebetween in the vertical direction. Similar to the guide hole 35 of the holding plate 28, a plurality of holes 38 through which the tips of the cones 34 pass are formed in the cradle 36.

  As shown in FIGS. 1 and 3, the inspection apparatus 10 includes a camera 40, an illumination 42, and a control device 44. In the vertical direction, the camera 40 and the illumination 42 face each other with the rubber sheet 4 therebetween. In the inspection apparatus 10, the camera 40 is located above the rubber sheet 4. The camera 40 is disposed at a position and orientation where the surface 4a of the rubber sheet 4 can be photographed. The camera 40 is, for example, a 5 million pixel camera. By photographing with this camera 40, image data of 5 million pixels can be obtained. In this inspection apparatus 10, the camera 40 is capable of photographing the surface 4a in the vertical direction.

  In this inspection apparatus 10, the illumination 42 is located below the rubber sheet 4. The illumination 42 is disposed so as to illuminate the back surface 4 b of the rubber sheet 4. In this inspection apparatus 10, the illumination 42 illuminates the back surface 4b in the vertical direction. This illumination 42 is LED illumination. The color of light of the illumination 42 is, for example, red.

  The control device 44 includes a control unit 46 and an information processing device 48. The control unit 46 has a function of controlling the camera 40. The control unit 46 has a function of receiving image data captured by the camera 40. The control unit 46 has a function of converting image data from an analog signal to a digital signal. The control unit 46 has a function of transmitting image data converted into a digital signal to the information processing device 48. Instead of the control unit 46, the camera 40 may have a function of converting image data from an analog signal to a digital signal.

  The information processing device 48 includes an input unit, a storage unit, a calculation unit, and an output unit. An example of the information processing apparatus 48 is a computer. The input unit has a function of receiving image data of a digital signal. The storage unit has a function of storing this image data. The calculation unit has a function of calculating image data, a function of comparing calculation data obtained by calculating image data with a reference value, and a function of determining whether the image data or calculation data is acceptable. Yes. The output unit has a function of outputting the image data, calculation data, and determination result. For example, the input unit is an interface board, the storage unit is a hard disk, the calculation unit is a CPU, and the output unit is a printer. The output unit may be a display in addition to the printer or instead of the printer.

  FIG. 4 shows a part of the rubber sheet 4 in which the priking holes 37 are formed. The rubber sheet 4 is obtained by joining one member piece 50 and another member piece 50. In FIG. 4, a joint portion between the end of one member piece 50 and the end of another member piece 50 is shown. An arrow A in FIG. 4 represents the conveyance direction of the rubber sheet 4. A two-dot chain line L <b> 1 represents a left contour reference line of the rubber sheet 4. A two-dot chain line L2 represents the right contour reference line of the rubber sheet 4. A double-headed arrow d1 represents the amount of deviation between the left contour of the rubber sheet 4 and the contour reference line L1. The deviation d1 is the maximum value of the difference between the left contour and the contour reference line L1 at the joint. A double-headed arrow d2 represents the amount of deviation between the right contour of the rubber sheet 4 and the contour reference line L2. This deviation d2 is the maximum value of the difference between the right contour and the contour reference line L2 at the joint. In FIG. 4, for convenience of description, the contour reference line L1 and the contour reference line L2 are shown shifted in the left-right direction by a larger amount than actually.

  FIG. 5 shows a flowchart of a method for inspecting a precricking hole according to the present invention. This inspection method includes an image data acquisition step, a deviation amount detection step, a hole detection step, a hole number counting step, a pass / fail determination step, and an output step.

  In the image data acquisition process, as shown in FIGS. 1 and 3, the illumination 42 of the inspection apparatus 10 illuminates the rubber sheet 4 from the back surface 4b toward the front surface 4a. The light of the illumination 42 passes through the precricking hole 37. The camera 40 images the surface 4a of the rubber sheet 4. The control unit 46 receives the image data of the photographed surface 4a. The control unit 46 converts this image data from an analog signal to a digital signal. The control unit 46 transmits the image data converted into the digital signal to the information processing device 48. The information processing device 48 receives this image data. After this image data acquisition step, the process proceeds to the shift amount detection step in FIG.

  6 includes a contour acquisition process, a contour reference line extraction process, a contour difference calculation process, a width calculation process, and a shift amount calculation process.

  In the contour acquisition process, the information processing device 48 detects the position of the left end in the width direction of the rubber sheet 4 based on the image data. The position of the left end is detected at predetermined intervals in the longitudinal direction of the rubber sheet 4. The left contour of the rubber sheet 4 is acquired. The right contour of the rubber sheet 4 is acquired in the same manner as the left contour. In this example, the position of the left end detected at a predetermined interval in the longitudinal direction is acquired as the left contour. The right end position detected at a predetermined interval in the longitudinal direction is acquired as the right contour.

  In the contour reference line extraction step, the information processing device 48 calculates the reference contour line L1 from the left end position obtained in the contour acquisition step (see FIG. 4). The reference contour line L1 is, for example, a contour line that is linearly approximated by a least square method from a plurality of left end positions in the longitudinal direction. This linear approximation by the least square method is an example, and the reference contour L1 may be approximated by other methods. Similar to the reference contour L1, a reference contour L2 is calculated.

  In the contour difference calculation step, the information processing device 48 calculates the difference between the position of the left end of the rubber sheet 4 and the reference contour line L1. A difference between the position of the left end and the reference contour line L1 is calculated along the longitudinal direction of the rubber sheet 4. The shift amount d1 in FIG. 4 represents one of the differences. Similar to the left end, the difference between the position of the right end of the rubber sheet 4 and the reference contour line L2 is calculated. The shift amount d2 in FIG. 4 represents one of the differences.

  In the width calculation step, the information processing device 48 calculates the width of the rubber sheet 4 from the reference contour line L1 and the reference contour line L2.

  In the shift amount calculation step, the information processing device 48 calculates the position where the difference between the contour and the reference contour lines L1 and L2 becomes the maximum value and the maximum value on each of the left and right sides. Specifically, the information processing device 48 calculates the position where the difference between the position of the left end of the rubber sheet 4 and the reference contour line L1 is the maximum value, and the maximum value thereof. In this rubber sheet 4, the amount of deviation d1 in FIG. 4 is the maximum value of the difference. Similar to the left end, the position where the difference between the position of the right end of the rubber sheet 4 and the reference contour line L2 becomes the maximum value and the maximum value thereof are calculated. In this rubber sheet 4, the amount of deviation d2 in FIG. 4 is the maximum value of the difference. After this shift amount detection step, the process proceeds to the hole detection step of FIG.

  In the hole detection step of FIG. 5, the image data is preprocessed. As this pretreatment, for example, the shadow or uneven gloss of the surface 4a of the rubber sheet 4 is canceled. The preprocessed image data is binarized with a predetermined threshold for each pixel. By this binarization, binarized image data is obtained. From the binarized image data, the precicking hole 37 is detected.

  In the hole number counting step, the number of precricking holes 37 detected in the binarized image data is totaled. In this step, the position and area of the prepicking hole 37 may be further obtained.

  In the pass / fail determination step, the information processing device 48 determines the amount of deviation d1, the amount of deviation d2, the width of the rubber sheet 4, and the number of printing holes 37. If the deviation amount d1 and the deviation amount d2 are equal to or less than the standard deviation amount ds, the information processing apparatus 48 determines that the deviation amount is acceptable. If the deviation amount d1 and the deviation amount d2 exceed the deviation amount ds, the information processing apparatus 48 determines that the deviation amount is unacceptable. Similar to the amount of deviation, the information processing device 48 determines whether or not the width of the sheet rubber 4 satisfies the standard width. The information processing device 48 determines whether or not the number of the precricking holes 37 satisfies the standard number.

  In the output process, the information processing device 48 outputs the shift amount d1, the shift amount d2, the width of the rubber sheet 4, the number of the printing holes 37, and the pass / fail judgments thereof. These pieces of information are output to the printer. The information processing device 48 stores these pieces of information. The stored information is stored as a manufacturing history of the rubber sheet 4 and used for tire quality assurance.

  Although not shown, the manufacturing facility 2 includes an alarm device. The control device 44 transmits a stop signal to the transport device 6 when the failure determination is made. The conveying device 6 stops conveying the rubber sheet 4. The control device 44 transmits an alarm signal to the alarm device. For example, the alarm device notifies the operator of the failure determination with an alarm sound and an alarm light.

  A method for manufacturing a tire including the method for inspecting the precricking hole will be described. This tire manufacturing method will be described using the manufacturing equipment 2 of FIG.

  This manufacturing method includes a member preparation step, a preforming step, and a vulcanization step. In the member preparation step, members constituting each part of the tire such as a tread, a sidewall, a bead, and a carcass of the tire are prepared. In the pre-molding step, members constituting each part of the tire are combined to obtain a raw cover (raw tire). In the vulcanization process, the raw cover is vulcanized and molded with a mold, and a tire is obtained from the raw cover.

  In this member preparation step, a rubber sheet 4 is prepared as one of the rubber members that constitute each part of the tire 2. The rubber sheet 4 is used for, for example, a carcass ply member constituting a carcass, a belt member constituting a belt, an inner liner member constituting an inner liner, and the like. Instead of the rubber sheet 4, a tread member constituting a tread, a side wall member constituting a sidewall, or the like may be used as the rubber member in which the priking hole 37 is formed.

  The method for manufacturing the rubber sheet 4 includes an extrusion process, a cutting process, a joining process, a precicking process, and a hole inspection process. This manufacturing method includes the above-described inspection method for precricking holes as a hole inspection step.

  In the extruding process, the rubber extruding member is extruded. In the cutting step, the rubber extruded member is cut at a predetermined interval to form a band-shaped rubber member piece 50. In the joining step, the end of one rubber member piece 50 is joined to the end of another rubber member piece 50. A plurality of rubber member pieces 50 are joined together to form a longer belt-like rubber sheet 4.

  In the pre-packing step, as shown in FIG. 1, the rubber sheet 4 is intermittently conveyed by the first belt conveyor 12 and the second belt conveyor 14. The first belt conveyor 12 and the second belt conveyor 14 repeat conveyance and stop of the rubber sheet 4. With the rubber sheet 4 stopped, the cylinder 20 lowers the elevating plate 26 and the pressing plate 28. The rubber sheet 4 is sandwiched between the pressing plate 28 and the cradle 36. The pressing plate 28 stops at the descending end where the rubber sheet 4 is sandwiched.

  The elevating plate 26 further descends against the urging force of the spring 32 and approaches the holding plate 28. The elevating plate 26 is further lowered, and the cone 34 is passed through the guide hole 35 of the pressing plate 28. The elevating plate 26 further descends and the cone 34 penetrates the rubber sheet 4. The penetrating cone 34 is passed through the hole 38 of the cradle 36. The elevating plate 26 is lowered to a predetermined lower end. In this manner, the prepicking hole 37 is formed in the rubber sheet 4.

  The lift plate 26 that has reached the descending end is lifted by the cylinder 20. The cone 34 is extracted from the hole 38, the wicking hole 37, and the guide hole 35. The elevating plate 26 is further raised, and the holding plate 28 is raised together with the elevating plate 26. The sandwiching of the rubber sheet 4 by the pressing plate 28 and the cradle 36 is released. The elevating plate 26 rises to a predetermined rising end and stops.

  The rubber sheet 4 whose pinching has been released is conveyed forward by the first belt conveyor 12 and the second belt conveyor 14. When the rubber sheet 4 is advanced by a predetermined distance, the conveyance of the rubber sheet 4 is stopped. In the state where the conveyance of the rubber sheet 4 is stopped, the bricking hole 37 is formed as described above. By repeating this process, the prepicking hole 37 is formed in the entire longitudinal direction of the rubber sheet 4. The rubber sheet 4 is conveyed to the test | inspection apparatus 10 after a precicking process. It is conveyed to the inspection apparatus 10, and a hole inspection process is implemented.

  This hole inspection step includes an image data acquisition step, a deviation amount detection step, a hole detection step, a hole number counting step, a pass / fail determination step, and an output step, as in the above-described inspection method for precricking holes. The deviation d1, the deviation d2, the width of the rubber sheet 4, and the number of the printing holes 37 are determined to be acceptable. These pieces of information are output to the printer and stored in the information processing device 48. When the failure determination is made, the conveying device 6 stops the conveyance of the rubber sheet 4, and the alarm device notifies the operator of the failure determination with, for example, an alarm sound and an alarm light.

  In this hole inspection process, the camera 40 images the surface 4a of the rubber sheet 4 to obtain image data. The control device 44 detects the prepicking hole 37 from this image data. The control device 44 counts the number of precricking holes. This hole inspection process accurately and automatically counts the number of printing holes. This hole inspection process can be easily incorporated into a tire production line. This hole inspection process contributes to improving the quality of the rubber sheet 4. This hole inspection process contributes to the improvement of tire quality.

  In this hole inspection process, in the image data acquisition process, the illumination 42 illuminates the priking hole 37 from the back surface 4b of the rubber sheet 4 toward the front surface 4a. The camera 40 captures the light that has passed through the priking hole 37. As a result, the detection of the prepicking hole 37 is easily and accurately performed.

  In visible light, red light has a long wavelength and is difficult to scatter. Such light is likely to pass through the bricking hole. Such light is easy to shoot with the camera 40. From this viewpoint, the light color of the illumination 42 is preferably red. The wavelength of light of the illumination 42 is preferably 570 (nm) or more, more preferably 590 (nm) or more, and particularly preferably 620 (nm) or more. From the viewpoint of photographing with the camera 40 as visible light, the wavelength of this light is preferably 830 (nm) or less, more preferably 750 (nm) or less.

  The tread member constituting the tread, the sidewall member constituting the sidewall and the like are thick in the vertical direction. In such a thick rubber member, it is difficult to detect the precricking hole 37. It is difficult for light to pass through the pre-kking hole 37. When photographing such a thick rubber member, the illumination 42 is preferably used, and visible light having a long wavelength can be preferably used.

  In the deviation amount detection step of the hole inspection step, a deviation between the left and right contours and the contour reference line is detected. In this method, the left and right deviation amounts d1 and d2 are detected. In the method so far, the right and left width of the rubber sheet 4 is measured, and when the left and right width exceeds a predetermined value, it is determined that the deviation is large. In the conventional method, even if either the shift amount d1 or the shift amount d2 is large, a good determination can be made if the left-right width is equal to or smaller than a predetermined value. In this manufacturing method, the shift amount d1 and the shift amount d2 are directly detected. This displacement amount detection step can detect the displacement of the joint more accurately.

  Another inspection method for the prepicking hole 37 according to the present invention will be described. This inspection method is configured in the same manner as the above-described inspection method of the precricking hole 37 except that the hole detection process is different. The tire manufacturing method according to the present invention may include this inspection method instead of the above-described inspection method. Here, this hole detection step will be described. The description of the same configuration as the above-described inspection method is omitted. The same components as those in the above-described inspection method will be described using the same reference numerals.

  This hole detection step will be described with reference to FIG. A section P surrounded by a two-dot chain line in FIG. 7 represents a search range of the priking hole 37. In this hole detection step, the control device 44 preprocesses the image data. The control device 44 binarizes the preprocessed image data with a predetermined threshold. By this binarization, binarized image data is obtained from the image data. The control device 44 detects the reference pliing hole 37a from the binarized image data. The control device 44 sets a plurality of search ranges P on the basis of the reference priming hole 37a and the contour reference line d1. These search ranges P are set in accordance with the arrangement of the cones 34 of the priking device 8. The control device 4 detects the other priming holes 37 within each search range P.

  In this inspection method, the search for the pre-kick hole 37 is limited to the search range P. Thereby, the search area | region of the prepicking hole 37 is limited. This inspection method can shorten the detection time of the prepicking hole 37. In addition, by limiting the search range P, it is possible to prevent foreign matters, shadows, gloss unevenness, and the like from being misidentified as the prepicking hole 37. In this method, the detection accuracy of the prepicking hole 37 is improved.

  Here, the search range P is set on the basis of the reference priming hole 37a, but the setting of the search range P is not limited to this. The search range P may be set in the rubber sheet 4 based on the conveyance distance from the priking device 8. Based on the arrangement positions of the cones of the priking device 8, the search range P of all the wicking holes 37 may be set. In setting the search range P, the above-described contour reference line L2 and the width of the rubber sheet 4 may be used.

  The method described above can be widely applied to the manufacture of a rubber member in which a priking hole is formed.

DESCRIPTION OF SYMBOLS 2 ... Manufacturing equipment 4 ... Rubber sheet 6 ... Conveyance apparatus 8 ... Bricking apparatus 10 ... Inspection apparatus 12 ... 1st belt conveyor 14 ... 2nd belt conveyor 16 ...・ Roller conveyor 18 ... Base plate 20 ... Cylinder 22 ... Slide bar 24 ... Guide 26 ... Elevating plate 28 ... Presser plate 30 ... Slide pin 32 ... Spring 34 ..Cone 36. 50 ... Member pieces

Claims (8)

The camera and the control device are prepared,
A large number of precricking holes are formed on the surface of the rubber member, and an image data obtaining step of obtaining image data by photographing the surface of the rubber member with the camera;
A hole detecting step in which the control device detects the precricking hole from the image data;
A method for inspecting a precricking hole, wherein the control device includes a hole count counting step for counting the number of the prepicked holes.   2. The inspection method according to claim 1, wherein in the image data acquisition step, illumination illuminates the priking hole from the back surface to the surface of the rubber member.   The inspection method according to claim 2, wherein a wavelength of light of the illumination is 570 (nm) or more. The rubber member is formed by bonding the end of one member piece and the end of another member piece,
A displacement amount detecting step for detecting a displacement amount in the width direction of the bonding position of the rubber member from the image data,
The above deviation amount detecting step
A contour acquisition step in which the control device acquires a contour of the end in the width direction of the rubber member from the image data; a contour reference line extraction step in which the control device calculates a contour reference line from the contour;
A contour difference calculating step in which the control device calculates a difference in the width direction between the contour and the contour reference line;
The inspection method according to any one of claims 1 to 3, wherein, in the deviation amount detection step, a difference in the width direction between the contour and the contour reference line is calculated for one and the other in the width direction of the rubber member. . The hole detection step
Setting a plurality of hole search ranges in the image data;
The inspection method according to any one of claims 1 to 4, further comprising a step of detecting a wicking hole in the hole search range. In the step of setting the hole search range,
A reference priming hole is detected from the above image data,
The inspection method according to claim 5, wherein the hole search range of other prepricking holes is set based on the position of the reference priming hole. A camera for photographing the surface of the rubber member in which a large number of precricking holes are formed on the surface, and a control device;
Preciding hole provided with a function for the control device to acquire image data photographed by the camera, a function for detecting a precricking hole from the image data, and a function for counting the number of detected precricking holes. Inspection device. A pre-kicking step in which a large number of pre-kicking holes are formed on the surface of the rubber member; and an image data obtaining step of obtaining image data by photographing the surface of the rubber member with a camera;
A hole detecting step in which the control device detects the precricking hole from the image data;
Hole number counting step for counting the number of the precricking holes detected by the control device;
A preforming step in which the rubber member is laminated with another rubber member to obtain a raw cover;
And a vulcanization process in which the raw cover is vulcanized to obtain a tire.

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