JP2014006068A - Inspection device and method for filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device and an inspection method for a filament 1, capable of inspecting a surface shape on the entire circumference of the filament 1 and detecting a very small shape changed part.SOLUTION: An inspection device includes a conveyance section 10 for conveying a filament 1 in an extending direction, a plurality of shape detection sections 20 for detecting the surface shape of the filament 1 from different directions in the outer peripheral direction of the filament 1, and a control unit 30 for specifying the generation of shape changed parts on the surface of the filament 1 on the basis of a detection signal from the shape detection section 20. When one shape changed part is detected at the plurality of shape detection sections 20 to generate a plurality of detection signals, the control unit 30 specifies the generation position of one shape changed part on the basis of the positions of the plurality of shape detection sections 20 in the extending direction of the filament 1 and the conveying speed of the filament 1.

Description

  The present invention relates to a linear body inspection apparatus and inspection method, and more particularly, to a linear body surface shape inspection apparatus and inspection method.

  Since a linear body such as various cables manufactured by extrusion molding may have irregularities locally on its surface, it is necessary to inspect the surface over the entire length of the linear body.

  Japanese Patent Laid-Open No. 58-207254 discloses parallel light, two photoelectric conversion elements arranged in parallel at a constant interval in the traveling direction of the linear body, and a differential amplifier, and the surface of the linear body. An apparatus for inspecting irregularities on the surface of a linear body that detects irregularities as a difference in electrical output is disclosed.

  In Japanese Patent No. 3249925, light emitted from one light source is converted into two slit lights, and each slit light is irradiated to two points located at a certain distance in the extending direction of the linear body. Disclosed is a linear body surface inspection apparatus that detects a variation in light quantity between two points caused by a defective part by measuring the light quantity of each slit light that is not shielded by the body, and detects the defective part. Has been.

  Further, in Japanese Patent Application Laid-Open No. 58-207254 and Japanese Patent No. 3249925, in order to inspect the entire circumference of the linear body, light is emitted from a plurality of different directions with respect to the linear body in each surface defect inspection apparatus. Irradiation is disclosed.

JP 58-207254 A Japanese Patent No. 3249925

  However, in the linear surface defect inspection apparatus described in Japanese Patent Application Laid-Open No. 58-207254 and Japanese Patent No. 3249925, in order to inspect the entire circumference of the linear body, the apparatus is arranged on the circumference of the linear body. In the case where a plurality of light emitting elements are arranged at the same position, it is difficult to detect a minute shape change part by detecting light from a light source not facing the light receiving part.

  The present invention has been made to solve the above-described problems. A main object of the present invention is to provide a linear body inspection apparatus and a linear body inspection method capable of performing surface shape inspection over the entire circumference of the linear body and capable of detecting minute shape change portions. It is in.

  The inspection apparatus for a linear body according to the present invention has a linear shape at a position different from each other in the extending direction with respect to the conveying section that conveys the linear body in the extending direction and the linear body that is conveyed by the conveying section. Multiple shape detection units that detect the surface shape of the linear body from different directions in the outer peripheral direction of the body, and control for identifying the occurrence of a shape change unit on the surface of the linear body based on detection signals from the shape detection unit And the control unit detects the position of the plurality of shape detection units in the extending direction of the linear body when a plurality of detection signals are generated by detecting one shape change unit in the plurality of shape detection units. And the generation position of the one shape change portion are specified based on the conveyance speed of the linear body.

  The said shape detection part can be arrange | positioned at equal intervals in an outer peripheral direction. The shape detection unit includes a light projecting unit that irradiates light to the linear body, and a detection unit that detects light applied to the linear body. You may detect the light irradiated to the location. The shape detection unit may include a polarization filter.

  The method for inspecting a linear body according to the present invention includes a step of calculating a conveyance speed of the linear body in the extending direction of the linear body, and a plurality of the linear bodies arranged at different positions in the extending direction. The surface of the linear body is detected on the basis of detection signals obtained in the step of detecting the surface shape of the linear body from different directions in the outer circumferential direction of the linear body and the step of detecting the surface shape, respectively. And a step of identifying the occurrence of the shape change portion in the step of identifying the occurrence of the shape change portion in the step of detecting the surface shape by detecting a plurality of shape change portions by a plurality of shape detection portions. When the detection signal is generated, the occurrence of the one shape change portion is specified based on the positions of the plurality of shape detection portions in the extending direction of the linear body and the conveyance speed of the linear body.

  According to the present invention, a surface shape inspection can be performed over the entire circumference of a linear body, and a minute shape change portion can be detected.

It is a block diagram of the linear body inspection apparatus which concerns on this Embodiment. It is a schematic diagram for demonstrating the shape detection part of the linear body inspection apparatus which concerns on this Embodiment. It is a schematic diagram when the shape detection part shown in FIG. 2 is seen from the extending direction of a linear body. It is a figure for demonstrating the structural example of the linear body inspection apparatus which concerns on this Embodiment. It is a flowchart for demonstrating the inspection method of the linear body which concerns on this Embodiment. It is a schematic diagram for demonstrating the shape detection part of the linear object inspection apparatus which concerns on this Embodiment 2. FIG. It is a schematic diagram for demonstrating the shape detection part of the linear body inspection apparatus which concerns on this Embodiment 3. FIG. It is a figure for demonstrating the shape detection part of the inspection apparatus of the linear body which concerns on a reference example.

  Embodiments of the present invention will be described below. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  First, a linear body inspection apparatus (hereinafter also referred to as a linear body inspection apparatus or simply an inspection apparatus) according to the present embodiment will be described with reference to FIGS. With reference to FIG. 1, the inspection apparatus according to the present embodiment includes a transport unit 10 that transports a linear body in the extending direction of the linear body, and a different position in the extending direction of the linear body. A shape detection unit 20 including a plurality of shape detection units for detecting the surface shape of the linear body (hereinafter also referred to as detection unit 20), and controls these to identify the occurrence of a shape change part on the surface of the linear body The control part 30 and the conveyance speed measurement part 40 which measures the conveyance speed of a linear body are provided. Here, the shape changing portion existing on the surface of the linear body includes, for example, a defect having irregularities, a scratch, a foreign object, a portion where unevenness in the thickness of the coating formed on the surface of the linear body has occurred, and the like.

  The said conveyance part 10 can be set as the arbitrary structures which can convey a linear body in the extension direction of a linear body. At this time, it is preferable that the linear body is conveyed so that the relative position between the linear body and the plurality of shape detection units is constant during the inspection. For this reason, for example, a pair of cylindrical members (guide rollers) facing each other so as to sandwich the linear body are arranged on the upstream side and the downstream side in the direction in which the linear body 1 is conveyed as shown in FIG. The configuration may be the transport unit 10. A plurality of shape detection units (for example, n sets of shape detection units including n light projecting units 11 and n detection units 12 illustrated in FIG. 4) are connected to the conveyance unit 10 which is an upstream cylindrical member. It is preferable to arrange | position between the conveyance parts 10 which are cylindrical members on the downstream side.

  An arbitrary speed can be adopted as the conveying speed of the linear body 1. For example, when the inspection apparatus according to the present invention is incorporated in the manufacturing process of the linear body 1, in the manufacturing process of the linear body 1, It is preferable that the inspection process using the inspection method is selected within a range that does not become a rate-limiting process. For example, the conveyance speed of the linear body 1 may be 70 m / min.

  The detection unit 20 includes a plurality of shape detection units 20a, 20b, and 20c arranged at different positions in the extending direction (conveyance direction) of the linear body 1 with reference to FIG. Specifically, the shape detection units 20a, 20b, and 20c detect, for example, the light projecting units 11a to 11c that emit light for inspection toward the linear body 1 and the light irradiated to the linear body 1. It is a plurality of sets (for example, 3 sets) of sensors composed of detection units 12a to 12c. One set of sensors is configured such that, for example, the light projecting unit 11a and the detecting unit 12a are arranged to face each other so as to sandwich the linear body 1 therebetween. In addition, the shape detection unit is configured to detect the surface shape of the linear body from different directions in the outer circumferential direction of the linear body.

  As described above, the light projecting units 11a, 11b, and 11c and the detection units 12a, 12b, and 12c are arranged to face each other with the linear body interposed therebetween. For this reason, out of the light irradiated from the light projecting units 11a, 11b, and 11c, the light transmitted without being blocked by the linear body 1 can be detected by the opposing detection units 12a, 12b, and 12c. Therefore, the light projecting units 11a, 11b, 11c and the detecting unit 12a, so that the spot diameter of the light irradiated to the linear body from the light projecting units 11a, 11b, 11c is larger than the diameter of the linear body 1. 12b and 12c are configured.

  2 and 3, the detection unit 20 includes three sets of shape detection units 20 a, 20 b, and 20 c, each of which is a position in the extending direction of the linear body 1 and the direction of the opposing surface. (Or directions of line segments connecting the light projecting units and the detection units constituting the shape detection units 20a, 20b, and 20c) are different. Each shape detection part 20a, 20b, 20c is arrange | positioned in the extending direction of the linear body 1 with arbitrary space | intervals W1, W2. For this reason, even if light is irradiated to the linear body 1 from the light projection parts 11a, 11b, and 11c in the different directions in the outer periphery direction of the linear body 1, the light from each light projection part 11a, 11b, and 11c is separately received. In addition, the detection units 12a, 12b, and 12c can detect with high accuracy. For example, the detection unit 12a receives light from the light projecting unit 11a, but does not face the detection unit 12a and is light from the light projecting units 11b and 11c at different positions in the extending direction of the linear body 1. Does not receive light. That is, in each detection part 12a, 12b, 12c, the detection of the light (disturbance light) from the other two light projection parts which are not respectively opposed can be suppressed, and as a result, the influence of the disturbance light on the detection signal can be suppressed. Thereby, the shape test | inspection of the said linear body 1 can be implemented with high precision from the various angles of the outer periphery of the linear body 1 using a some shape detection part. That is, when the entire circumference of the linear body 1 is inspected by a plurality of shape detection units, it is possible to suppress a decrease in inspection accuracy.

  Each of the shape detection units 20a, 20b, and 20c is a linear body that is perpendicular to the optical axis of the light emitted from each of the light projecting units 11a to 11c and is located on a vertical plane including the center of the linear body 1 The sensitivity is good for the shape of the surface of 1. And when the uneven | corrugated defect as a shape change part exists in the area | region of the surface of the linear body 1 which is not located on the said vertical plane, this uneven | corrugated defect increases / decreases the light quantity which permeate | transmits the said vertical plane substantially perpendicularly. Only when there is an appropriate size, the detection units 12a, 12b, and 12c can detect an increase or decrease in the amount of received light, and as a result, it is possible to identify the occurrence of the concavo-convex defect. That is, when the number of the shape detection units 20a, 20b, and 20c is small, or when the shape detection units 20a, 20b, and 20c are arranged in a certain direction as viewed from the linear body 1, the inspection device is Although the inspection of the portion located in the specific direction in the outer periphery of the linear body 1 can be performed with high accuracy, the same inspection accuracy cannot be maintained over the entire periphery of the linear body 1, and the specific direction The inspection accuracy is limited for areas other than the portion located at.

  Therefore, in order to carry out inspection with high inspection accuracy over the entire circumference of the linear body 1, three or more shape detectors 20a, 20b, 20c are arranged in different directions as viewed from the linear body 1. Is preferred. Furthermore, it is preferable that the shape detection units 20 a, 20 b, and 20 c are arranged at equal intervals in the outer peripheral direction of the linear body 1. For example, when the inspection apparatus includes three shape detection units 20a, 20b, and 20c, the direction of the line segment that connects the light projecting unit and the detection unit that form each shape detection unit 20a, 20b, and 20c is linear. The body 1 can be arranged so as to cross each other at an angle of 60 ° in the outer circumferential direction (that is, at equal intervals in the outer circumferential direction). As a result, the shape of the linear body 1 can be inspected with high accuracy over the entire circumference of the linear body 1 without unevenness.

  2 and 3, the detection unit 20 includes three sets of shape detection units 20a, 20b, and 20c. However, as shown in FIG. 4, an arbitrary natural number n (n ≧ 3) sets of projections are provided. You may have the shape detection part which consists of the optical part 11 and the detection part 12. FIG. Also at this time, each shape detection part can be arrange | positioned so that it may become equal intervals in the outer peripheral direction of the linear body 1. FIG. For example, the n shape detection units may be arranged so as to be shifted in the outer circumferential direction by an angle θ = 180 ° / n when viewed from the linear body 1. At this time, the n shape detection units are arranged at an arbitrary interval along the extending direction of the linear body 1. Here, as shown in FIG. 2, the angle θ is one light projecting unit (or detection unit) viewed from the linear body 1 and another light projecting unit (or detection unit) adjacent to the one light projecting unit (or detection unit). The angle between the light part (or detection part). When n sets of shape detection units are arranged at equal intervals in the outer circumferential direction so that the angle θ = 180 ° / n, the larger n is, the more the entire linear body 1 is suppressed while suppressing the influence of disturbance light. A highly accurate inspection can be carried out evenly over the circumference.

  Furthermore, the plurality of shape detection units can be arranged at equal intervals (W1 = W2 with reference to FIG. 2) at an arbitrary interval in the extending direction of the linear body 1. By arranging a plurality of shape detection units at equal intervals in the extending direction of the linear body 1, the calculation of the delay time for each shape detection unit 20 can be facilitated as will be described later.

  The plurality of shape detection units may not be arranged at equal intervals in the extending direction of the linear body 1, and may be individually arranged at arbitrary intervals W1, W2 (W1 ≠ W2). Even if the plurality of shape detection units are arranged at arbitrary intervals in the extending direction of the linear body 1, the linear body can be calculated by calculating the delay time for each of the shape detection units 20 as described later. It is possible to accurately identify the position of the shape change portion.

  In addition, since the position in the extending direction of the linear body 1 with respect to a plurality of shape detection units, the position and direction in the outer peripheral direction, etc. directly affect the inspection accuracy, the positioning accuracy according to the desired detection accuracy is obtained. There is a need. For example, the position of the shape detection unit in the extending direction of the linear body 1 affects the delay time, and the position of the linear body 1 in the outer peripheral direction is influenced by disturbance light or the inspection position in the outer peripheral direction of the linear body 1. Affects.

  Furthermore, it is preferable that the light projecting units 11a, 11b, 11c, and 11 have lenses for condensing light. Thereby, also when a light emitting diode (LED) etc. are used for a light source, the spot diameter of the light irradiated to the linear body 1 surface can be narrowed down, and a luminous intensity can be raised. By increasing the luminous intensity, it is possible to detect the change in the amount of received light due to the surface irregularity defect of the linear body 1 with higher accuracy. At this time, the interval between the adjacent shape detection units arranged at different positions in the extending direction of the linear body 1 is such that the configuration of the optical system in the shape detection unit is such that the respective shape detection units do not become disturbance factors. The interval may be set arbitrarily. For example, it is good also as 1.5 times or more of the diameter of the lens provided in the light projection parts 11a, 11b, 11c, and 11. Thereby, it can suppress more effectively that one becomes a disturbance factor of the other between adjacent shape detection parts. The specifications of the lens are determined so that the spot diameter of the light from the light projecting portions 11 a, 11 b, 11 c, 11 is larger than the diameter of the linear body 1. Moreover, you may install a lens in the detection part 12a, 12b, 12c, 12 side.

  As a light source of the light projecting units 11a, 11b, 11c, and 11, for example, a laser may be used in addition to the above-described LED. As the detection units 12a, 12b, 12c, and 12, for example, photoelectric conversion elements may be used. When there are a plurality of the light projecting units 11a, 11b, 11c, and 11 and the detection units 12a, 12b, 12c, and 12, the same members may be used. Thereby, apparatus cost can be reduced.

  Moreover, the distance from the linear body 1 of the light projection part and detection part which are arrange | positioned at equal intervals in the outer peripheral direction of the linear body 1 can be made equal. In other words, when viewed from the extending direction of the linear body 1 as shown in FIG. 3, all the light projecting units 11a, 11b, 11c and the detection units 12a, 12b are concentrically centered on the linear body 1. 12c can be arranged. At this time, as described above, the plurality of light projecting units 11a, 11b, and 11c and the detection units 12a, 12b, and 12c are configured by the same member, so that the entire circumference of the linear body 1 is equivalent. Inspection can be performed under conditions.

  In addition to the light projecting units 11a, 11b, and 11c and the detection units 12a, 12b, and 12c arranged at equal intervals in the outer peripheral direction of the linear body 1, other projections that are made of different members and are not arranged at equal intervals. You may arrange | position a light part and a detection part. At this time, the other light projecting unit and the detection unit may be any relative relative to the light projecting units 11a, 11b, and 11c and the detection units 12a, 12b, and 12c that are arranged at equal intervals, as long as no disturbance light is generated. You may arrange in a position. For example, with respect to the light projecting parts 11a, 11b, 11c arranged at equal intervals made of LEDs, a light projecting part made of laser from a certain direction is arbitrarily arranged, and in addition to the surface inspection over the entire circumference of the linear body 1, It is also possible to perform a high-precision inspection for a specific outer circumferential direction.

  With reference to FIGS. 1 and 4, the control unit 30 can process output signals from the transport unit 10, the shape detection unit 20, the transport speed calculation unit 40, and the like and output them as inspection results. The control unit 30 includes the linear body 1 output from the position of the linear body 1 in the extending direction of the plurality of shape detection units, which are a set of the light projecting unit 11 and the detection unit 12, and the conveyance speed measurement unit 40. The generation position of the shape changing portion on the surface of the linear body 1 can be specified based on the data relating to the transport speed of the first and second detection signals output from the detection unit 20.

  Specifically, when each shape detection unit included in the detection unit 20 detects one location of the linear body 1 and outputs a detection signal, each detection signal is an extension of the linear body 1. It waits for a time difference (delay time) determined in the calculation unit 33 depending on the position in the direction and the conveyance speed of the linear body 1 and is input to the memory unit 31 of the control unit 30. In this case, the timing at which the shape detection unit located on the most downstream side (last stage) in the extending direction of the linear body 1 detects one location of the linear body 1 and outputs a detection signal to the memory unit 31; The delay times for the respective shape detection units are set so that the detection signals from the other shape detection units are synchronized with the timing at which the signals are input to the memory unit 31. As a result, detection signals obtained from the respective shape detection units for the same portion of the linear body 1 are simultaneously input to the memory unit 31. When a plurality of detection signals are input to the memory unit 31 at the same timing, it is determined that the plurality of detection signals input at the same timing indicate the same shape changing portion on the surface of the linear body 1. The Therefore, when a plurality of detection signals are input at the same timing as described above, it is assumed that one shape change portion (defective portion) is detected corresponding to the one timing, and the count unit 32 is counted from the memory unit 31. Defect detection information is output. The count unit 32 that has received the defect detection information stores the occurrence of one shape change unit. In the memory unit 31, the position of the shape changing unit corresponding to the detection signal on the linear body 1 according to the timing when the detection signal is input (for example, the linear shape in the longitudinal direction of the linear body 1. The distance from the tip of the body 1 is calculated and transmitted to the count unit 32 as the defect detection information. Note that the position of the shape changing portion on the linear body 1 is, for example, the time when the tip of the linear body 1 to be inspected passes the detection unit 20 (passes the shape detection unit located at the last stage of the detection unit 20). The time from when the detection signal is input to the memory unit 31 and the history of the conveyance speed of the linear body 1.

  Thereby, when one shape change part of the linear body 1 is detected by the several shape detection part arrange | positioned in the different position in the extension direction of the linear body 1, ie, 1 of the linear body 1 Even when a plurality of detection signals are input to the memory unit 31 for one shape change unit, the control unit 30 detects a plurality of detection signals caused by the same shape detection unit in the memory unit 31. By synchronizing the timing at which the signal is input, it is possible to suppress the occurrence of a problem that the shape change portion is erroneously counted. In addition, since it is possible to configure so that the shape changing portions existing at the same position in the extending direction of the linear body 1 are not double counted, the presence or absence of the shape changing portion in the extending direction of the linear body can be accurately determined. Can be inspected. Thereby, quality control etc. in the manufacturing process of a linear body can be made easy.

  In addition, as long as the detection signals from the plurality of shape detection units that have detected the shape change portion generated in one place of the linear body 1 can be synchronized (that is, the plurality of detection signals are input to the memory unit 31 in synchronization). In this case, the timing at which the plurality of detection signals are input to the memory unit 31 in synchronization may be arbitrarily changed. That is, a delay time is also set for the detection signal from the last shape detection unit in the detection unit 20, and after a predetermined time has elapsed since the last shape detection unit detected the shape change unit, A plurality of detection signals resulting from the shape changing unit may be input to the memory unit 31.

  As described above, the surface inspection result is preferably output as the inspection result over the entire circumference of the linear body 1, but may be output for each shape detection unit. In this case as well, the position of the shape change portion can be specified with respect to the outer peripheral portion that can be detected by the shape detection unit in the linear body 1, but the shape change portion does not exist over the entire circumference of the linear body 1 (non-defective portion). In order to confirm the position and length, it is necessary to confirm all the detection results of the plurality of shape detection units.

  As described above, the linear object inspection apparatus according to the present embodiment arranges the shape detection units in different directions in the outer peripheral direction of the linear object 1 and detects the surface shape of the linear object 1. Surface inspection over the entire circumference of the body 1 is possible. Further, at this time, since the plurality of shape detection units are respectively arranged at different positions in the extending direction of the linear body 1, one shape detection unit reduces the inspection accuracy as a disturbance to other shape detection units. Therefore, it is possible to detect a minute shape change portion. That is, the linear body inspection according to the present embodiment enables a surface inspection over the entire circumference of the linear body 1 and can detect a minute shape change portion.

  In addition, about the linear body conveyance speed, the conveyance speed measurement part 40 may be provided like the example of FIG. 1, and the measurement data regarding a conveyance speed may be transmitted to the control part 30 from the conveyance speed measurement part 40, or a conveyance part When the conveyance speed of the linear body 1 can be directly calculated at 10, the conveyance speed data may be directly transmitted from the conveyance unit 10 to the control unit 30.

  Further, as described above, in the control unit 30, each of the shape detection units is determined based on the position of the plurality of shape detection units 20 in the extending direction of the linear body 1 and the conveyance speed of the linear body 1. You may calculate the delay time with respect to the detection signal which a shape detection part outputs. The control unit 30 processes the detection signal from each shape detection unit 20 based on the delay time calculated for each shape detection unit 20, for example, one shape existing on the surface of the linear body 1 Even when a plurality of shape detection units respectively transmit detection signals to the change unit, defect detection information corresponding to the one shape change unit can be output to the count unit 32. Thereby, the part which the shape change part generate | occur | produced can be detected reliably. Further, for example, the total distance of the non-defective parts of the linear body 1 in which the shape change portion is not detected can be easily calculated based on the information on the generation site of the shape change portion.

  Next, a method for inspecting a linear body according to the present embodiment will be described with reference to FIGS. As shown in FIG. 5, the method for inspecting a linear body according to the present embodiment is different from the step (S10) of calculating the conveyance speed in the extending direction of the linear body 1 in the outer peripheral direction of the linear body. A step of detecting the surface shape of the linear body from the direction (S20), and a step of identifying the occurrence of the shape change portion on the surface of the linear body (S30).

  First, the process (S10) which calculates the conveyance speed to the extending direction of a linear body is demonstrated. In the step (S10), the transport speed of the linear body 1 transported in the extending direction of the linear body 1 (see FIG. 4) by the transport unit 10 is calculated. Specifically, the conveyance speed measurement unit 40 (see FIG. 1) measures the conveyance speed of the linear body 1 and outputs measurement data obtained by the measurement to the control unit 30 (see FIG. 1). The control unit 30 calculates the conveyance speed (linear speed) of the linear body 1 based on the input measurement data. The transport speed may be directly detected by the transport unit 10. After calculating the conveyance speed, it is preferable to maintain a constant conveyance speed until the inspection is completed.

  Next, for each of the plurality of shape detection units arranged at different positions in the extending direction with respect to the linear body 1, a detection signal delay time is calculated based on the conveyance speed and the position information of the shape detection unit. The process will be described. The delay time includes a plurality of shape detection units for one place (for example, a generation part of a flaw or a foreign matter adhesion) where the shape change part is generated in the extending direction of the linear body 1 in the subsequent step (S30). When a detection signal is output, a plurality of shape change portions are not generated, but one shape change portion is generated and used to process the detection signal. Therefore, the delay time affects the inspection accuracy and the position specifying accuracy. For this reason, the positions of the plurality of shape detection units in the extending direction of the linear body used for calculating the delay time and the conveyance speed calculated as described above have an accuracy according to the desired inspection accuracy and the like. Is preferred. By obtaining these data with high accuracy, the shape change portion can be accurately detected.

  The delay time may be calculated when the detection signal obtained in the step (S20) is processed in the subsequent step (S30). However, by calculating in advance, the delay time (S30). ) Can be improved.

  The delay time can be calculated from the position information of each shape detection unit in the extending direction of the linear body, and the position information and the conveyance speed detected in the step (S10). The calculated delay time is the largest in the shape detection unit on the uppermost stream side (uppermost stage) in the extending direction (conveyance direction) of the linear body, and becomes smaller as it goes downstream. At this time, the position information of the plurality of shape detection units in the extending direction of the linear body may be based on the position of the last shape detection unit. In this case, the delay time of the last shape detection unit is Can be zero. Thereby, the process in the step (S30) can be performed at the timing when one shape changing unit is detected in the last shape detecting unit (that is, the process can be performed with the minimum delay time in the subsequent step (S30)). Therefore, the influence of the delay time on the inspection time can be minimized. Note that the delay time of the last-stage shape detection unit may be an arbitrary value. In this case, the delay time for each shape detection unit obtained by adding the delay time (the arbitrary value) of the last shape detection unit to the delay time for each shape detection unit calculated as described above. It can be.

  Next, the process (S20) which detects the surface shape of a linear body is demonstrated. In this step (S <b> 20), light is irradiated on the surface of the linear body 1 from the light projecting unit 11 (see FIG. 4) included in the plurality of shape detection units constituting the detection unit 20, and the linear body 1 is shielded from the light. This is a step of outputting a detection signal to the control unit 30 according to the amount of received light detected without being transmitted and detected by the detection unit 12 (see FIG. 4). In addition, although it is preferable to employ | adopt a structure as shown in FIG.2 and FIG.3 as a structure for a shape detection part to detect the surface shape of the linear body 1, another structure may be employ | adopted. As shown in FIG. 4, in the time when a specific position (one place) of the linear body 1 is conveyed to a plurality of shape detection units arranged at different positions in the extending direction of the linear body 1. There is a predetermined time difference determined by the position of each shape detection unit in the extending direction of the linear body 1 and the conveyance speed of the linear body 1. The time difference is equivalent to the time difference at which a detection signal for detecting one location of the linear body (for example, a location where a defect as a shape change portion is formed) is output from each shape detection portion. As such a time difference, for example, when a detection signal is output from one of the plurality of shape detection units and when a detection signal is output from the shape detection unit located at the last stage of the plurality of shape detection units. If this time is defined as the time between the two, the time difference generated in this step (S20) is equal to or corresponding to the delay time calculated in the previous step (S11).

  Next, the step (S30) of specifying the occurrence of the shape change portion on the surface of the linear body will be described. In this step (S30), the detection signal output from the shape detection unit in the previous step (S20) is processed in the control unit based on the delay time described above, integrated as an inspection result, and output.

  In the previous step (S20), the detection signal for detecting one location of the linear object is output from the respective shape detection units by the time difference determined by the position of the shape detection unit in the linear body extending direction. Output in different states. At this time, when one shape change portion is generated on the surface of the linear body 1 and a plurality of shape detection portions detect the one shape change portion, the one shape change portion causes the Detection signals are output from a plurality of shape detection units that detect one shape change unit. That is, a plurality of detection signals corresponding to one shape changing portion are output. For this reason, in order to accurately output the position information of the shape changing portion in the extending direction of the linear body 1, a plurality of detection signals output from the plurality of shape detecting portions are detected for each shape detecting portion. It is necessary to integrate each position in the extending direction of the linear body 1 in consideration of a time difference in signal output.

  Therefore, in the present step (S30), the above inspection result can be output with high accuracy by correcting the time difference using the delay time calculated in the previous step. Specifically, as already described with reference to the control unit 30 in FIG. 4, the memory unit is configured to delay the detection signal output from each shape detection unit by a delay time determined for each shape detection unit. If it is input to 31 (see FIG. 4), a plurality of detection signals resulting from the shape change portion at the same location in the extending direction of the linear body 1 are input to the memory unit 31 at the same timing. As a result, regardless of the portion of the outer periphery of the linear body 1 where the shape change portion is generated, the occurrence location of the shape change portion can be accurately detected.

  For example, two procedures are conceivable as a procedure for calculating the delay time used in the processing. For example, the delay time is calculated in advance in, for example, the above-described step (S10), and in this step (S30), the detection signal obtained in the previous step (S20) is processed using the delay time. It is a procedure to do. Another one is that the delay time is not calculated in advance before this step (S30), but in this step (S30), the delay time is calculated from the transport speed calculated in step (S10). This is a procedure for processing the detection signal based on the delay time. The same inspection result can be output by any procedure, but the one with the higher processing speed may be selected in consideration of the configuration of the control unit.

  Next, the step (S40) for determining whether or not the inspection is completed will be described. As shown in FIG. 5, in step (S <b> 40), it is determined whether or not the inspection for the presence or absence of the shape change portion of the linear body 1 has been completed. Any method can be used as the determination method. For example, the length from the tip of the linear body 1 that has passed through the shape detection unit located at the last stage of the detection unit 20 is calculated from the conveyance speed of the linear body 1 and the inspection time, and the length is calculated as a line. The end of the inspection may be determined by comparing with a reference value determined in advance based on the total length of the body 1. Alternatively, when the operator manually inputs the end of the inspection, the presence or absence of the input may be determined. Then, when it is determined that the inspection is not completed (NO) in the step (S40), the above steps (S10) to (S40) are repeated. On the other hand, if it is determined in the step (S40) that the inspection is completed (YES), a predetermined process for ending the inspection, for example, the conveyance of the linear body 1 is stopped and the operation of the shape detection unit is stopped. Is implemented. In this way, the inspection of the linear body 1 is completed.

  When a linear body inspection apparatus that can inspect the entire circumference of the linear body 1 by using such a linear body inspection method detects a shape change portion about the entire circumference of the linear body 1 And when the said shape change part is detected by the some shape detection part 20, That is, when a some detection signal is input into the control part 30 with respect to one shape change part, it is the same The plurality of detection signals can be processed as detection signals for the shape change portion. For this reason, the inspection method for a linear object according to the present embodiment can output an inspection result that can accurately specify the position of the shape changing portion of the linear object.

  As described above, the linear body inspection method according to the present embodiment includes a plurality of shape detection units based on the positions of the linear bodies in the extending direction of the plurality of shape detection units and the conveyance speed of the linear bodies. By synchronizing a plurality of detection signals output with a time difference from each other, it is possible to output a surface inspection result over the entire circumference of the linear body, and at the same time, along the extending direction of the linear body 1 Since a plurality of shape detection units are arranged at a predetermined interval, it is possible to detect a minute shape change unit. Furthermore, position information in the extending direction of the linear body of the shape changing portion can be output accurately.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. The linear body inspection device and the linear body inspection method according to the present embodiment basically have the same configuration as the linear body inspection device and the linear body inspection method according to the first embodiment. Referring to FIG. 6, polarizing filters 13a, 13b, 13c, 14a, 14b, and 14c are respectively installed in the light projecting units 11a, 11b, and 11c and the detecting units 12a, 12b, and 12c that form the shape detecting unit. It is different in point.

  At this time, for example, the polarizing filters 13a and 14a included in each of the pair of the light projecting unit 11a and the detecting unit 12a facing each other with the linear body 1 interposed therebetween are arranged so that the polarization planes are in the same direction. On the other hand, the polarization filters 13a and 14a have different polarization planes from the polarization filters 13b and 14b included in another set of the light projecting unit 11b and the detection unit 12b adjacent in the extending direction of the linear body 1. Is preferably arranged. Thereby, the disturbance light from the adjacent shape detection part (for example, the light from the light projection part 11b detected in the detection part 12a) can be suppressed effectively, and the inspection accuracy of the linear body surface shape can be improved. .

  When the light projecting unit or the detecting unit has a lens, the polarizing filter can be disposed on the linear body 1 side as viewed from the lens. Thereby, the linear body 1 can be irradiated with light having a uniform polarization plane, and only the light irradiated from the facing light projecting unit can be received by the detection unit.

  The linear object inspection apparatus according to the present embodiment includes a plurality of shape detection units arranged at different positions in the extending direction of the linear object, and the plurality of shape detection units each having a polarization filter. Since the influence of disturbance light in the plurality of shape detection units is suppressed by one configuration, the influence of disturbance light in the shape detection unit can be more reliably suppressed.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. The linear body inspection device and the linear body inspection method according to the present embodiment basically have the same configuration as the linear body inspection device and the linear body inspection method according to the first embodiment. Referring to FIG. 7, the light projecting units 11a, 11b, and 11c constituting the shape detecting unit irradiate light of different wavelengths, and the detecting units 12a, 12b, and 12c facing each other are from the light projecting units that are not facing each other. This is different in that it has wavelength filters 15a, 15b, and 15c that cut light.

  Thereby, the disturbance light from the adjacent shape detection part (for example, the light from the light projection part 11b detected in the detection part 12a) can be suppressed effectively, and the inspection accuracy of the linear body surface shape can be improved. .

  The linear object inspection apparatus according to the present embodiment is arranged with a plurality of shape detection units at different positions in the extending direction of the linear object, and the plurality of light projecting units irradiate light of different wavelengths, respectively. Since the detection unit opposite to each other has different wavelength filters, the influence of disturbance light in the plurality of shape detection units is suppressed by the two configurations, so that the influence of disturbance light in the shape detection unit can be more reliably suppressed.

(Reference example)
Next, reference examples of the present invention will be described. With reference to FIG. 8, a linear object inspection apparatus according to a reference example of the present invention includes a light projection unit 11a, 11b, 11c and a detection unit 12a, 12b, 12c that constitute a plurality of shape detection units. , 13b, 13c, 14a, 14b, and 14c, the plurality of shape detection units are arranged at the same position in the extending direction of the linear body 1 and at different positions in the outer peripheral direction of the linear body 1, respectively. ing. Note that a configuration in which a plurality of shape detection units that are arranged in one direction in the extending direction of the linear body 1 in this way and in which the optical axes of the light used for inspection are arranged in different directions is arranged as an extension of the linear body 1. One or more may be arranged at different positions in the direction.

  At this time, as shown in FIG. 8, the light projecting units and the detection units included in all the shape detection units have polarization filters, and the direction of the polarization plane of the polarization filter is different for each shape detection unit. The polarizing filter is arranged. As a result, even if a plurality of shape detection units are arranged at the same position in the extending direction of the linear body 1 (at different positions in the outer circumferential direction), each shape detection unit can receive disturbance light from other shape detection units. Not affected. As a result, it is possible to improve the inspection accuracy of the shape changing portion by the shape detecting portion.

  The linear body inspection method using the linear body inspection apparatus shown in FIG. 8 basically has the same configuration as the inspection method in the first embodiment, but in the extending direction of the linear body 1. When adopting a configuration in which a plurality of shape detection units are not arranged at different positions, it is different in that there is no need to calculate a delay time for each shape detection unit. Therefore, the linear body inspection method according to the present embodiment can simplify the process as compared with the inspection method according to the first embodiment. Therefore, it is possible to shorten the processing time in the control unit in the step (S30), and as a result, the inspection speed can be shortened by increasing the conveyance speed of the linear body 1.

  Furthermore, as another reference example, a plurality of light projecting units that irradiate light of different wavelengths, and a plurality of detection units that have wavelength filters that cut light other than the wavelength irradiated by the opposing light projecting units, You may arrange | position in the same position of the extending direction of the shape body 1 (at the different position of an outer peripheral direction). Also at this time, each shape detection unit is not affected by disturbance light from other shape detection units, and the accuracy of inspection of the shape change unit by the shape detection unit can be improved.

  As described above, the embodiment of the present invention has been described. However, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The linear body inspection apparatus and the linear body inspection method according to the present invention include a linear body inspection apparatus and a linear body inspection method that need to perform surface inspection over the entire circumference of the linear body with high accuracy. It is applied particularly advantageously.

  DESCRIPTION OF SYMBOLS 1 Linear body, 10 conveyance part, 11, 11a, 11b, 11c Light projection part, 12, 12a, 12b, 12c Detection part, 13a, 13b, 13c, 14a, 14b, 14c Polarization filter, 15a, 15b, 15c Wavelength Filter, 20, 20a, 20b, 20c Shape detection unit, 30 control unit, 31 memory unit, 32 count unit, 33 calculation unit, 40 transport speed measurement unit.

Claims (5)

A transport unit for transporting the linear body in the extending direction;
A plurality of surface shapes of the linear body are detected from different directions in the outer circumferential direction of the linear body at different positions in the extending direction with respect to the linear body transported by the transport unit. A shape detector;
A control unit that identifies the occurrence of a shape change portion on the surface of the linear body based on a detection signal from the shape detection unit;
The plurality of shape detection units in the extending direction of the linear body when the plurality of detection signals are generated by detecting one shape change unit in the plurality of shape detection units. An inspection apparatus for a linear body that identifies the occurrence of the one shape change portion based on the position of the linear body and the conveyance speed of the linear body.   The linear body inspection device according to claim 1, wherein the shape detection units are arranged at equal intervals in the outer circumferential direction. The shape detection unit includes a light projecting unit that irradiates light to the linear body, and a detection unit that detects the light irradiated to the linear body,
The said detection part is an inspection apparatus of the linear body of Claim 1 or Claim 2 which detects the said light irradiated to one place of the said linear body from the said light projection part.   The said shape detection part is a linear body inspection apparatus of any one of Claims 1-3 which has a polarizing filter. Calculating the conveyance speed of the linear body in the extending direction of the linear body;
The surface shape of the linear body is detected from different directions in the outer circumferential direction of the linear body using a plurality of shape detection units arranged at different positions in the extending direction with respect to the linear body. And a process of
Based on the detection signal obtained in the step of detecting the surface shape, comprising the step of identifying the occurrence of a shape change portion on the surface of the linear body,
In the step of identifying the occurrence of the shape change portion, in the step of detecting the surface shape, when a plurality of the detection signals are generated by detecting one shape change portion by a plurality of the shape detection portions, A method for inspecting a linear body, wherein the generation of the one shape change section is specified based on the positions of the plurality of shape detection sections in the extending direction of the linear body and the conveyance speed of the linear body.

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