JP2011123056A - Apparatus and method for inspecting product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for inspecting products precisely inspecting the products in an extremely simple and inexpensive configuration and easily coping with various products having different shapes and specifications without depending on the color tones of the products to be inspected. <P>SOLUTION: When inspection units 12a-12d displace a detection block 102 in the direction of an arrow Z via an adaptor 104 in a state where reference units 16a-16d of the products are in contact with positioning bolts 38a-38d, the displacement is amplified by a link member 78 and is converted to displacement in the direction of an arrow X in the displacement block 68. The displaced displacement block 68 is photographed by a CCD camera 20 to get the production quality judged from the image. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a product inspection apparatus and inspection method for inspecting a product by comparing the shape of a product with the shape of a reference product.

  In recent years, with the advancement of technology and intensifying competition, it has been demanded to provide products with high added value in consideration for the environment, and to reduce the weight and cost of the products. In order to cope with these demands, integration and complication of products are progressing by reducing the number of parts, and product inspection apparatuses for inspecting such products are also complicated and expensive.

  For example, even if the parts used in an automobile are the same parts, the dimensions and shapes of the details may be different depending on the target vehicle type, the left and right of the attachment site, the export destination, and the like. In order to inspect the presence or absence of manufacturing defects in such products, product identification is performed by forming identification pins that represent the vehicle type, production line, specifications, etc., in the specified parts of the product and confirming the number and dimensions of the identification pins. There is a way to do it. Some identification pins have not only the purpose of identifying a product but also a function as an assembly guide pin for improving production efficiency. Conventionally, product inspection based on the state of the identification pin has been performed manually by an operator.

  However, along with the increasing variety and complexity of products, it is extremely difficult for even experienced workers to reliably inspect individual products using identification pins. Therefore, in particular, in products such as automobile parts that have a short product life cycle and frequently change product specifications, perform product inspection in a short time and accurately without bothering workers. In addition, a product inspection device that can easily cope with various products having different specifications is desired.

  For example, Patent Document 1 discloses an inspection apparatus that takes an image of a product to be conveyed with a camera, processes the image to obtain a product shape, and detects the presence or absence of a defect in comparison with the shape of a reference product. ing.

  Patent Document 2 discloses an inspection apparatus that extracts a defective product by irradiating a conveyed product with a laser beam at a specified inspection timing, detecting the laser beam, and performing a contour inspection of the product. ing.

  Patent Document 3 discloses an inspection device that inspects the appearance of a product by causing the contact to abut against a burr of the product and detecting the displacement of the contact with a displacement meter that is displaced integrally with the contact. Yes.

  Patent Document 4 measures the product dimensions by pressing a contact mounted on one end of the arm against the product and detecting the displacement of the other end of the arm that rotates about the support shaft with a linear sensor. An inspection apparatus is disclosed.

JP-A-8-29358 JP-A-11-337499 JP 2008-102072 A JP 2007-315998 A

  However, as in the prior art disclosed in Patent Documents 1 and 2, in the case of an inspection apparatus that takes an image of a product or scans a product with a laser beam, the color of the inspection portion of the product and the color of the background When the contrast is small or when the product is transparent, it is extremely difficult to extract the inspection site. In addition, the shape of the examination site is usually different for each product, and advanced image processing technology is required to reliably extract the examination site and make a pass / fail judgment.

  On the other hand, in the prior art disclosed in Patent Document 3, a contact is brought into contact with the product and the amount of displacement is directly detected. In order to detect the presence or absence of burrs on the product with high accuracy, Sensor is required, and the apparatus becomes expensive.

  In the prior art disclosed in Patent Document 4, a contact mounted on one end of the arm is pressed against the product, and the displacement of the other end of the arm rotated by this is detected by a linear sensor. However, this configuration is merely a configuration in which the displacement direction of the contact is converted and detected by the rotation of the arm, instead of the prior art of Patent Document 3 that directly detects the displacement of the contact. Moreover, as is clear from the description of FIG. 2 of Patent Document 4, the displacement of the contact at one end of the arm is reduced and transmitted to the other end. Therefore, the detection sensitivity is not increased by using an arm.

  The present invention has been made in view of the above problems, and can inspect products with high accuracy with a very simple and inexpensive configuration without depending on the color tone of the product to be inspected. An object of the present invention is to provide a product inspection apparatus and inspection method that can easily cope with various products having different shapes and specifications.

  The product inspection apparatus according to the present invention includes a positioning unit that positions the product by contacting a reference portion of the product, and a first block that is displaced by being pressed by an inspection unit disposed in a predetermined part of the product. , One end connected to the first block, a transmission member for amplifying the displacement of the first block and transmitting it to the other end, and connected to the other end of the transmission member and displaced by the transmission member It is characterized by comprising a second block and detection means for detecting the position of the second block when the product is positioned by the positioning means.

  In the product inspection apparatus, the transmission member includes a link member having one end connected to the first block, the other end connected to the second block, and an intermediate portion rotatably supported by a shaft body. The displacement of the one end due to the rotation of the link member is amplified and transmitted to the other end.

  The product inspection apparatus includes: a determination unit that determines the position of the second block detected by the detection unit by comparing with a predetermined threshold; and a notification unit that notifies a determination result by the determination unit. To do.

  In the product inspection apparatus, the detection unit includes a camera that captures an image of the second block.

  The product inspection apparatus includes an appearance inspection unit that inspects the appearance of the product, and the camera photographs the appearance of the product arranged in the appearance inspection unit.

  The product inspection method according to the present invention includes a first step of displacing the first block by an inspection unit disposed in a predetermined part of the product, amplifying the displacement of the first block and transmitting the amplified displacement to the second block, A second step of displacing the second block; and a third step of taking an image of the second block and obtaining a position of the second block based on the image, and based on the position of the second block The product is inspected.

  In the product inspection apparatus and the inspection method of the present invention, the displacement of the first block by the inspection section of the product is amplified by the transmission member, and the second block is displaced and detected, so that the shape of the product can be realized with a very simple and inexpensive configuration. Can be inspected with high accuracy.

  In addition, in order to inspect indirectly based on the position of the second block, instead of directly confirming the state of the inspection unit of the product, for example, the second block is photographed with a camera, and the product When determining the state of the inspection unit, even if the product color is a black or other color tone with a very low contrast, an extremely good image can be obtained regardless of the color tone, and the state of the inspection unit can be easily and highly accurately Can be determined.

  Furthermore, various products having different shapes can be easily handled by appropriately replacing the first block according to the shape of the inspection section of the product or adjusting its position.

  Furthermore, an appearance inspection unit that arranges the product for inspecting the appearance is also provided, and the appearance of the product arranged in the appearance inspection unit is photographed with a camera, so that not only the shape of the product but also the product Inspection including appearance can be performed efficiently.

It is a partially broken block diagram of the product inspection apparatus of this embodiment. It is the perspective view which looked at the product test | inspected with the product inspection apparatus of this embodiment from the downward direction. It is a perspective view of the inspection jig which constitutes the product inspection device of this embodiment. It is a perspective view of the test | inspection unit which comprises the product test | inspection apparatus of this embodiment. It is side surface explanatory drawing of the inspection unit which comprises the product inspection apparatus of this embodiment. It is a control circuit block diagram of the product inspection apparatus of this embodiment. It is a flowchart of the product inspection method of this embodiment. It is explanatory drawing of the image image | photographed with the CCD camera which comprises the product inspection apparatus of this embodiment. It is a perspective view of the inspection jig which constitutes the product inspection device of other embodiments. FIG. 10 is an explanatory side view of the inspection jig shown in FIG. 9. It is a flowchart of the product inspection method using the inspection jig shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a partially broken configuration diagram of a product inspection apparatus 10 according to the present embodiment. The product inspection apparatus 10 is an apparatus that inspects the presence or absence of manufacturing defects of the product W to be inspected based on the product shape. In addition to the manufacturing defects, the product inspection apparatus 10 can also determine the type of the product W from the product shape.

  As shown in FIG. 2, the product W includes a plurality of inspection units 12 a to 12 d in a predetermined portion in order to specify the type, production line, specification, or the like of the product W or to inspect a manufacturing defect of the product W. By detecting the product shape such as the number of inspection parts 12a to 12c made of identification pins, presence / absence, length, depth of the inspection part 12d made of recesses, etc., it is possible to determine the type of product W and to detect manufacturing defects. Inspection can be performed. Further, the product W includes two engagement holes 14a and 14b for engaging the product W with an inspection jig to be described later, and four reference portions 16a to 16d for positioning the product W on the inspection jig. Have. The lengths of the inspection parts 12a to 12c made of identification pins are set with reference to the positions of the reference parts 16a to 16d, and the depth of the inspection part 12d made of recesses is set with reference to the positions of the reference parts 16a to 16d. Is done.

  The product inspection apparatus 10 includes a support base 22 that houses a CCD camera 20 (detection means) having an illumination light source 18, and an inspection jig 24 that is placed on the support base 22. The inspection jig 24 is a jig for inspecting the product shape of the positioned product W, and can be attached to and detached from the support base 22 with bolts 26a to 26d. Therefore, it is possible to cope with the inspection of the product W having different specifications by exchanging the inspection jig 24. An opening 28 for photographing the inspection jig 24 from the lower surface using the CCD camera 20 is formed on the upper surface of the support table 22 on which the inspection jig 24 is placed.

  Next, the configuration of the inspection jig 24 will be described with reference to the perspective view of FIG. The inspection jig 24 includes a lower plate 30 fixed by bolts 26a to 26d to the opening 28 (FIG. 1) of the support base 22, and three stretchable columns that are urged upward by an elastic member (not shown). And an upper plate 34 supported by the lower plate 30 via 32a to 32c.

  The lower plate 30 extends upward through the opening 36 of the upper plate 34, and the reference portions 16 a to 16 d (FIG. 2) of the product W are in contact with the upper end portion, so that the lower plate 30 is in contact with the lower plate 30. Four positioning bolts 38a to 38d (positioning means) for positioning the product W are arranged. The number and height of the positioning bolts 38a to 38d can be adjusted according to the number and position of the reference portions 16a to 16d of the product W. The lower plate 30 is provided with a plurality of inspection units 40a to 40d for inspecting the length, presence / absence, and depth of the inspection portions 12a to 12d of the product W. The inspection units 40a to 40d are arranged according to the positions of the inspection units 12a to 12d of the product W. Furthermore, the lower plate 30 includes a trigger sensor 42 that detects that the upper plate 34 has approached a predetermined position with respect to the lower plate 30 and generates a trigger signal for starting an inspection, and an inspection jig 24. Replacement handles 44a and 44b for replacement are provided.

  The upper plate 34 is provided with two guide pins 46a and 46b that engage with the engagement holes 14a and 14b of the product W, and a product detection sensor 48 that detects that the product W is mounted on the upper plate 34. Established.

  The inspection units 40a to 40d are configured as shown in FIGS. That is, the inspection units 40a to 40d have a block 52 that is fixed to the lower plate 30 by two bolts 50a and 50b. The bolts 50a and 50b are engaged with a long hole 54 formed in the block 52, whereby the position of the block 52 in the direction of arrow Y can be adjusted. Legs 58a and 58b of a gate-shaped support member 56 are fixed to the block 52 by bolts 60a and 60b. The bolts 60a and 60b engage with the long holes 62a and 62b formed in the leg portions 58a and 58b, whereby the position of the support member 56 in the arrow X direction can be adjusted.

  Long holes 64 a and 64 b extending in parallel with the surface of the lower plate 30 are formed in the leg portions 58 a and 58 b of the support member 56. Two shaft bodies 66a and 66b that are separated from each other by a predetermined distance in the extending direction engage with the long holes 64a and 64b.

  A rectangular parallelepiped displacement block 68 (second block) is disposed between the leg portions 58 a and 58 b of the support member 56, and the shaft bodies 66 a and 66 b are fixed to the displacement block 68. The displacement block 68 can be displaced in the extending direction (arrow X direction) of the long holes 64a and 64b via the shaft bodies 66a and 66b. The displacement block 68 faces the opening 70 formed in the lower plate 30 in order to take an image thereof with the CCD camera 20 disposed inside the support base 22. In this case, the displacement block 68 is selected with a color or gloss that can easily recognize the edge portion 72 of the displacement block 68 from the image taken by the CCD camera 20. In addition, a mask 74 (FIG. 5) that restricts the imaging range of the displacement block 68 is attached to the opening 70.

  A T-shaped link member 78 (transmission member) can be rotated on the support member 56 in the directions of arrows θ1 and θ2 via a support shaft 76 attached to a portion of the support member 56 on the upper plate 34 side. It is pivotally supported. Long holes 80a and 80b extending in a linear direction passing through the support shaft 76 are formed at the lower end (the other end) of the link member 78 on the lower plate 30 side. The long holes 80a and 80b are displaced with respect to the long holes 80a and 80b. The shaft body 66 a fixed to the block 68 is engaged through the long holes 64 a and 64 b of the support member 56.

  In addition, a connection block 82 is fixed to the portion of the support member 56 on the upper plate 34 side adjacent to the link member 78 by two bolts 84a and 84b. The bolts 84a and 84b are engaged with a long hole 86 formed in the connection block 82, whereby the position of the connection block 82 in the arrow X direction can be adjusted. The position adjustment of the connection block 82 is performed by the adjustment screw 88. That is, as shown in FIG. 5, the adjustment screw 88 abuts on a bracket 90 whose head is fixed to the connection block 82, and is screwed to a bracket 92 fixed to the support member 56. By rotating the adjusting screw 88 in one direction, the connecting block 82 is pressed by the adjusting screw 88 and displaced to the link member 78 side, and by rotating the adjusting screw 88 in the other direction, the connecting block 82 is moved together with the bracket 90. Displace in the opposite direction.

  The connecting block 82 has a scale 94 for confirming the position of the connecting block 82, and an indicator plate 96 is formed on the support member 56 side corresponding to the scale 94. Based on the indication position of the indication plate 96 with respect to the scale 94, the adjustment position of the connecting block 82 can be confirmed.

  A spring 98 is disposed between the connection block 82 and the link member 78. The link member 78 is urged to rotate in the direction of the arrow θ <b> 1 about the support shaft 76 by the elastic force of the spring 98. Further, the lower end portion of the pressing pin 100 penetrating the connecting block 82 is brought into contact with the upper end portion (one end portion) of the link member 78 on the upper plate 34 side. The pressing pin 100 rotates the link member 78 in the direction of the arrow θ <b> 2 by pressing the link member 78 against the elastic force of the spring 98.

  An upper end portion of the pressing pin 100 is fixed to a detection block 102 (first block) having a substantially L shape. The detection block 102 detects the inspection units 12 a to 12 d via the adapter 104. 4 and 5, the inspection units 12a to 12c made of the identification pin are shown. Similarly, the inspection unit 12d made of the recess can be detected by inserting the adapter 104 into the inspection unit 12d. it can. When the detection block 102 is displaced in the arrow Z direction via the adapter 104 by the inspection units 12a to 12d, the pressing pin 100 presses the link member 78. The adapter 104 is set in a shape corresponding to the length and depth of the inspection units 12a to 12d. Depending on the shape of the inspection units 12a to 12d, the detection block 102 may be directly pressed by the inspection units 12a to 12d without using the adapter 104.

  FIG. 6 is a control circuit block diagram of the product inspection apparatus 10. The product inspection apparatus 10 includes a control unit 106 that performs overall operation control. The control unit 106 includes an illumination light source 18, a trigger sensor 42, a product detection sensor 48, a threshold setting unit 108 that sets a threshold that is an allowable range of the position of the displacement block 68, an image controller 110 (determination unit), and inspection units 12 a to 12. An OK / NG lamp 112 (notification means) for displaying the determination result of 12d and a warning buzzer 114 (notification means) for notifying the determination result of NG with a buzzer sound are connected. A threshold memory 116 that stores the threshold set by the threshold setting unit 108 is connected to the image controller 110. The image controller 110 controls the CCD camera 20 to take an image of the displacement block 68, processes the acquired image to determine the position of the displacement block 68, and compares it with the threshold value stored in the threshold value memory 116. The quality of the inspection units 12a to 12d is determined.

  The product inspection apparatus 10 of this embodiment for inspecting the product shape is basically configured as described above. Next, the operation will be described with reference to the flowchart shown in FIG.

  First, the operator installs the inspection jig 24 corresponding to the product W to be inspected on the support base 22, and positions of the inspection units 12a to 12d formed on the product W and the inspection units 12a to 12 made of identification pins. The inspection units 40a to 40d are adjusted according to the length of 12c and the depth of the inspection portion 12d made of a recess (step S1). For example, in FIG. 4, the block 52 is displaced in the arrow Y direction with the bolts 50a and 50b loosened, and the legs 58a and 58b of the support member 56 are moved in the arrow X direction with the bolts 60a and 60b loosened. By displacing, the positions of the inspection units 40a to 40d with respect to the directions of the arrows X and Y can be adjusted. Further, by selecting the adapter 104 to be mounted on the detection block 102, it is possible to make adjustments according to the length or depth of the inspection units 12a to 12d.

  Next, the operator uses the threshold setting unit 108 to determine the allowable range of the position of the displacement block 68 when the inspection units 12a to 12d that specify the product shape of the product W are correctly formed. It is set as a threshold value for every 12d (step S2). Each set threshold value is stored in the threshold memory 116 via the image controller 110. It is not always necessary to set the threshold every time the inspection jig 24 is installed. When a plurality of thresholds corresponding to the product W are stored in the threshold memory 116 in advance and the inspection jig 24 is installed, A threshold value corresponding to the product W to be inspected may be read from the threshold value memory 116.

  After the above setup work is completed, the operator engages the engagement holes 14 a and 14 b of the product W with the guide pins 46 a and 46 b disposed on the upper plate 34 of the inspection jig 24. At this time, the product detection sensor 48 disposed on the upper plate 34 detects the product W (step S3).

  When the product W is pressed together with the upper plate 34 toward the lower plate 30 and the upper plate 34 is displaced by a predetermined amount, the positioning bolts 38a to 38d disposed on the lower plate 30 are brought into contact with the reference portions 16a to 16d of the product W. Touch. At this time, the trigger sensor 42 disposed on the lower plate 30 detects the upper plate 34, and a positioning completion signal indicating that the positioning of the product W with respect to each of the inspection units 40a to 40d is completed as a trigger signal. (Step S4).

  On the other hand, when the product W is displaced to the lower plate 30 side via the upper plate 34, the inspection units 12a to 12d formed on the product W displace the detection block 102 in the arrow Z direction via the adapter 104 ( 4 and 5). When the detection block 102 is displaced in the arrow Z direction, the pressing pin 100 fixed to the detection block 102 is also displaced in the arrow Z direction, and the link member 78 that abuts on the end portion is rotated in the arrow θ2 direction.

  When the link member 78 rotates about the support shaft 76 in the direction of the arrow θ2, the displacement block 68 is displaced in the direction of the arrow X through the shaft body 66a that engages with the long holes 80a and 80b formed at the ends. . In this case, as shown in FIG. 5, the displacement amount of the detection block 102 in the arrow Z direction is the distance Z1 from the support shaft 76 of the link member 78 to the center of the shaft body 66a and the action of the pressing pin 100 from the support shaft 76. Amplification is performed using the ratio Z1 / X1 with the distance X1 to the point as a magnification. This magnification can be finely adjusted by displacing the connecting block 82 in the arrow X direction using an adjusting screw 88 attached to the connecting block 82. Further, the adjustment position can be confirmed as the position of the instruction plate 96 with respect to the scale 94.

  When the product detection signal from the product detection sensor 48 and the trigger signal indicating completion of positioning from the trigger sensor 42 are input, the control unit 106 drives the illumination light source 18 to move the displacement block 68 from the lower plate 30 side. While illuminating, the CCD camera 20 is driven via the image controller 110. The image controller 110 controls the CCD camera 20 to photograph a portion including the edge portion 72 of the displacement block 68 (step S5). In this case, by setting the displacement block 68 to a color or gloss that can be easily recognized by the edge portion 72, an image having a high contrast that does not depend on the color of the product W can be obtained.

  The image controller 110 processes the image of the displacement block 68 photographed by the CCD camera 20, and is mounted at a predetermined position of the opening 70 of the lower plate 30 (see FIG. 5), for example, as shown in FIG. The distance X2 between the end portion 75 of the mask 74 and the edge portion 72 of the displacement block 68 is calculated as the position of the displacement block 68. Then, the distance X2 is compared with the threshold value of each of the inspection units 12a to 12d stored in the threshold memory 116, and whether or not the distance X2 is within an allowable range, that is, whether or not the inspection units 12a to 12d are present, The quality of the length and depth is determined (OK / NG), and the determination result is supplied to the control unit 106 (step S6).

  Instead of comparing the permissible position of the edge portion 72 of the displacement block 68 set as the threshold value with the position of the edge portion 72 obtained by image processing, the displacement block facing the opening 70 is determined. The area of 68 images (the range indicated by hatching in FIG. 8) may be calculated and the pass / fail judgment may be made by comparing the area with the threshold value of the allowable area. In this case, the area of the range indicated by hatching can be calculated based on the number of pixels (number of pixels) of the image of the displacement block 68.

  As a result of the determination, when all the inspection units 12a to 12d formed in the product W have a desired product shape, the control unit 106 turns on the green OK / NG lamp 112, for example. The product W is informed that it has a normal product shape (step S7).

  On the other hand, if at least one of the inspection units 12a to 12d formed on the product W has a defective product shape, the control unit 106 turns on the red OK / NG lamp 112 and sounds the warning buzzer 114, for example. To inform the operator that the product W is defective. When the OK / NG lamp 112 and the warning buzzer 114 notify that the product W is defective, the worker discards the product W. As a result, only the non-defective product W can be reliably shipped.

  By repeating the above processing (step S8), the product shape of a large number of products W having a complicated configuration, for example, the number, presence / absence, length of the inspection units 12a to 12c, the depth of the inspection unit 12d including the recesses, etc. It is possible to quickly and reliably perform the quality determination inspection of the product shape.

  FIG. 9 is a perspective view of an inspection jig 120 constituting a product inspection apparatus according to another embodiment. FIG. 10 is an explanatory side view of the inspection jig 120. The inspection jig 120 includes a shape inspection unit 122 that performs shape inspection of the product W and an appearance inspection unit 124 that performs external inspection such as scratches and dirt on the surface of the product W. In this case, since the configuration of the shape inspection unit 122 is the same as that of the inspection jig 24 shown in FIG. 3, the same reference numerals as those of the components of the inspection jig 24 are given, and detailed description thereof is omitted.

  The shape inspection unit 122 and the appearance inspection unit 124 constituting the inspection jig 120 are arranged on a common plate 126. The inspection jig 120 is placed and fixed on the support base 22 by bolts 26a to 26d instead of the inspection jig 24 shown in FIG. Inside the support base 22, a CCD for inspecting the product shape of the product W positioned in the shape inspection unit 122 and inspecting the appearance of the product W positioned in the appearance inspection unit 124 such as scratches and dirt. A camera 20 is arranged.

  The appearance inspection unit 124 has a rectangular opening 128 formed in the plate 126 in order to photograph the appearance of the product W by the CCD camera 20. It is detected that two guide pins 130a and 130b engaged with the engagement holes 14a and 14b of the product W and the product W are attached to the appearance inspection unit 124 at predetermined positions on the peripheral edge of the opening 128. The product detection sensor 132 is disposed.

  Next, a product inspection method using the inspection jig 120 will be described based on the flowchart shown in FIG.

  The operator installs the inspection jig 120 corresponding to the product W to be inspected on the support base 22, positions the product W on the shape inspection unit 122, and performs the shape inspection of the product W (step S11). The shape inspection method for the product W is the same as the inspection method using the inspection jig 24 shown in FIG.

  When the shape inspection of the product W is completed (step S12, YES), the control unit 106 (see FIG. 6) switches the inspection mode of the product W from the shape inspection mode to the appearance inspection mode (step S13). Therefore, the worker uses the threshold setting unit 108 to set a threshold for appearance inspection (step S14). The set threshold value is stored in the threshold value memory 116. The threshold value need not always be set every time the inspection mode is switched. A plurality of threshold values are stored in the threshold memory 116 in advance, and the threshold value corresponding to the product W corresponding to the inspection mode is read from the threshold memory 116. You may do it.

  Here, the threshold value for appearance inspection refers to an ideal image obtained by photographing the surface of the product W in an ideal state free from scratches and dirt with the CCD camera 20 and the product W to be inspected. This is a threshold value for comparing the inspection image obtained by photographing and determining whether or not the surface of the product W to be inspected is in an acceptable state. This threshold value is, for example, one threshold value for comparing the overall density of the ideal image and the overall density of the inspection image, or for dividing the ideal image and the inspection image into a plurality of areas and comparing the density of each area. Can be set as a plurality of threshold values.

  After the inspection mode is switched to the appearance inspection mode, the operator removes the product W whose shape inspection has been completed from the shape inspection unit 122, and engages the guide pins 130a and 130b constituting the appearance inspection unit 124 with the engagement holes of the product W. 14a and 14b are engaged. At this time, the product detection sensor 132 disposed on the peripheral edge of the opening 128 detects the product W (step S15).

  When receiving the product detection signal from the product detection sensor 132, the control unit 106 drives the CCD camera 20 via the image controller 110. The image controller 110 controls the CCD camera 20 and photographs the surface of the product W through the opening 128 (step S16).

  The image controller 110 processes the image of the surface of the product W photographed by the CCD camera 20, and compares, for example, the overall density of the image with the threshold value set in step S14 and stored in the threshold value memory 110. Then, a quality determination (OK / NG determination) is made as to whether or not the surface has inappropriate scratches or dirt, and the determination result is supplied to the control unit 106 (step S17).

  The control unit 106 notifies the operator of the determination result using, for example, the OK / NG lamp 112 (step S18). By repeating the above processing (step S19), it is possible to efficiently inspect the appearance of many products W. Needless to say, the appearance inspection of the product W by the appearance inspection unit 124 may be performed prior to the shape inspection of the product W by the shape inspection unit 122.

  In this way, by using the inspection jig 120, the shape inspection of the product W by the shape inspection unit 122, such as the number, presence / absence, length of the inspection units 12a to 12c, the depth of the inspection unit 12d formed of the recesses, and the like. Following the inspection of the product shape, the appearance inspection of the product W by the appearance inspection unit 124, for example, the surface of the product W is scratched, dirty, improperly deformed, missing parts, or recognition of characters recorded on the surface The visual inspection such as can be efficiently performed. As a result, as compared with an inspection jig in which the shape inspection unit 122 and the appearance inspection unit 124 are configured independently, the work process can be reduced and the cost required for the work can be reduced.

  The present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention.

  For example, the threshold value for determining the quality of the product shape of the product W is a displacement obtained when a reference product having a correct shape is set on the inspection jig 24 of the product inspection apparatus 10 and the reference product is positioned. The predetermined allowable range based on the image of the block 68 can be automatically set. Similarly, a threshold value for determining the quality of the appearance of the product W can be automatically set based on the reference product.

  Further, as a transmission member constituting the shape inspection section 122 of the inspection jig 24 and the inspection jig 120, any mechanism other than the link member 78 can be used as long as it can amplify the displacement of the first block and transmit it to the second block. May be used.

  In addition, in the appearance inspection of the product W, an image obtained by photographing the surface of the product W may be displayed on a display, and the operator may visually confirm the image to make a pass / fail determination.

  In the inspection jig 120 shown in FIG. 10, the image of the displacement block 68 for inspecting the shape of the product W and the image of the product W for inspecting the appearance of the product W with the CCD camera 20 fixed. Can be taken at the same time. On the other hand, the CCD camera 20 is configured to be movable between the imaging position of the shape inspection unit 122 and the imaging position of the appearance inspection unit 124, and the image of the displacement block 68 and the product at each imaging position. You may comprise so that it may test | inspect by image | photographing the image of the surface of W, respectively.

  In addition, by configuring the appearance inspection unit 124 of the inspection jig 120 so that the positions of the guide pins 130a and 130b can be adjusted, a product inspection apparatus corresponding to various products W having different shapes can be obtained.

  Further, in the product inspection apparatus 10 shown in FIG. 1, after the shape inspection of the product W is performed using the inspection jig 24 capable of inspecting only the product shape, the inspection jig 24 is subjected to the appearance inspection unit 124 shown in FIG. It is possible to replace the inspection jig having only the above and perform an appearance inspection.

DESCRIPTION OF SYMBOLS 10 ... Product inspection apparatus 12a-12d ... Inspection part 14a, 14b ... Engagement hole 16a-16d ... Reference | standard part 18 ... Illumination light source 20 ... CCD camera 22 ... Support stand 24, 120 ... Inspection jig 30 ... Lower plate 34 ... Upper part Plate 38a-38d ... Positioning bolt 40a-40d ... Inspection unit 42 ... Trigger sensor 46a, 46b, 130a, 130b ... Guide pin 48, 132 ... Product detection sensor 56 ... Support member 68 ... Displacement block 78 ... Link member 82 ... Connection block 98 ... Spring 100 ... Pressing pin 102 ... Detection block 106 ... Control unit 108 ... Threshold setting unit 110 ... Image controller 112 ... OK / NG lamp 114 ... Warning buzzer 116 ... Threshold memory 122 ... Shape inspection unit 124 ... Appearance inspection unit 126 ... Plate W ... Product

Claims (6)

Positioning means for positioning the product by contacting the reference portion of the product;
A first block that is pressed and displaced by an inspection section disposed in a predetermined part of the product;
A transmission member having one end connected to the first block, amplifying the displacement of the first block and transmitting the amplified displacement to the other end;
A second block connected to the other end of the transmission member and displaced by the transmission member;
Detecting means for detecting the position of the second block when the product is positioned by the positioning means;
A product inspection apparatus comprising: The product inspection apparatus according to claim 1,
The transmission member includes a link member having one end connected to the first block, the other end connected to the second block, and an intermediate portion rotatably supported by a shaft. A product inspection apparatus characterized by amplifying the displacement of the one end due to the rotation of the rotation and transmitting it to the other end. The product inspection apparatus according to claim 1 or 2,
Determination means for comparing the position of the second block detected by the detection means with a predetermined threshold;
Notification means for notifying the determination result by the determination means;
A product inspection apparatus comprising: In the product inspection apparatus according to any one of claims 1 to 3,
The product inspection apparatus according to claim 1, wherein the detection unit includes a camera that captures an image of the second block. The product inspection apparatus according to claim 4,
An appearance inspection unit for inspecting the appearance of the product,
The product inspection apparatus, wherein the camera photographs an appearance of the product arranged in the appearance inspection unit. A first step of displacing the first block by an inspection unit disposed at a predetermined part of the product;
A second step of amplifying and transmitting the displacement of the first block to the second block and displacing the second block;
A third step of taking an image of the second block and determining a position of the second block based on the image;
And inspecting the product based on the position of the second block.

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