JP4011409B2 - Article management method and management apparatus - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to an article management method and management apparatus for managing an article that has passed through a first position on a transport path in the order of arrival when the article reaches a second position downstream of the first position.
[0002]
[Prior art]
Conventionally, there is a case where a plurality of articles are inspected at a plurality of positions on a conveyance path while a plurality of articles are continuously conveyed downstream one by one, and the conveyed articles are comprehensively evaluated from the plurality of inspection results. . As an example of this, when an article reaches the first position on the conveyance path, the upper surface of the article is imaged with a CCD camera to inspect the appearance for any scratches, and further downstream of the first position. When the article arrives at the second position, the appearance of both sides of the article is imaged with a CCD camera to inspect the appearance for scratches, and from these inspection results, the good, defective, and re-inspected for this article. There are cases where three types of evaluations of products are performed.
[0003]
[Problems to be solved by the invention]
Conventionally, an inspection result of an article that has passed the first position nth on the premise that the article that has passed the first position nth and the article that has passed the second position nth always match. From the inspection result of the article that has reached the nth position in the second position, the article that has passed the nth position through the second position is evaluated.
[0004]
However, there is no problem if the article reliably passes from the first position to the second position without changing the order, but the article that has passed the first position nth and the second position nth If the article passed through is different, there is a problem that accurate evaluation cannot be performed on the article.
Specifically, the inspection is not sufficient with only the top surface and the side surface of the article, and when the appearance inspection of the bottom surface of the article is additionally performed, it is necessary to reverse the front and back of the article. This is because an article may be lost.
[0005]
The present invention relates to an article that can identify and manage an article that has reached the second position even if the article that has passed through the first position on the conveyance path is lost before reaching the second position. An object is to provide a management method and a management apparatus.
[0006]
[Means for Solving the Problems]
  In order to achieve the above object, a method for managing articles according to the present invention includes:
An article management method for managing an article that has passed through a first position on a conveyance path nth (n is a natural number) in the order of arrival when the article reaches a second position downstream from the first position. A first step of obtaining a predicted value related to the arrival of the article at the second position for the article that has passed through the first position, and the article that has reached the second position at the nth position. A second step of acquiring an actual measurement value required for transporting the article from the first position to the second position when it is assumed that the article has passed through the first position nth. And the difference between the nth predicted value and the nth actually measured value isFirst toleranceWhen it is within the range, the article that has passed through the first position nth is identified as having passed the second position nthWhen the difference is outside the first allowable range, the measured value of the article that has reached the second position in the second position and the article that has passed through the first position n + jth (j is a natural number). When the difference from the predicted value is within the second allowable range, it is determined that the article that has passed through the first position nth has not reached the second position.And a third step. In particular, the predicted value and the actual measurement value are represented by a measurement value obtained by measuring a change amount that changes in accordance with the transport of the article.
[0007]
  According to this configuration, it is possible to specify whether or not the article that has passed through the second position nth is the article that has passed through the first position nth. For this reason, it is possible to accurately manage the articles to be conveyed. Here, the amount of change that changes in accordance with the transport feed includes a time change amount, a transport position change amount, a drive shaft rotation angle change amount, and the like.
Further, the third stepOfAccording to the configuration, even if the article that has passed through the first position is lost, the article that has reached the second position nth and the article that has passed through the first positionDistinguishCan be identified.
[0008]
  oneWayAn article management method for managing an article that has passed through a first position on a transmission path nth (n is a natural number) in the order of arrival when the article arrives at a second position downstream from the first position. A first step of obtaining a predicted value related to the arrival of the article at the second position for the article that has passed through the first position, and the article that has reached the second position at the nth position. A second step of acquiring an actual measurement value required for transporting the article from the first position to the second position when it is assumed that the article has passed through the first position nth. And when the difference between the n-th predicted value and the n-th actual measured value is within the first allowable range, the article that has passed through the first position n-th time passes the second position n-th And when the difference is outside the first tolerance range, The difference between the measured value of the article that has reached the position n + kth (k is a natural number) and the predicted value of the article that has passed the first position nth is within the second allowable range. A third step of specifying that the article that has passed through the first position nth has reached the second position n + kth;Specially includingCollectionIt is said. According to this configuration, even if there is a contaminant between articles that have passed through the first position, the article that has reached the second position nth and the article that has passed through the first positionDistinguishCan be identified.
[0009]
The transport path includes at least the first transport path and the second transport path, and an article transported on the first transport path passes through the first position, and the second transport path The article conveyed on the conveyance path is characterized by passing through the second position. For this reason, even if there is a high possibility that the article is lost between the first position and the second position, the article can be managed accurately.
[0010]
  On the other hand, the management device according to the present invention transfers an article that has passed through the first position on the conveyance path nth (n is a natural number) in the conveyance device that conveys a plurality of articles one by one. A management device that manages in order of arrival when a second position that is downstream of the first position arrives, and for the article that has passed through the first position for the nth time, the article reaches the second position. The first acquisition means for acquiring a predicted value for the article and the article that has reached the nth position of the second position, the article of the article when it is assumed that the article has passed the nth position of the first position A second acquisition means for acquiring an actual measurement value related to arrival at the second position, and a difference between the n-th predicted value and the n-th actual measurement value isFirst toleranceWhen it is within the range, it is determined that the article that has passed through the first position nth has reached the second position nth.When the difference is outside the first allowable range, the measured value of the article that has reached the second position in the second position and the article that has passed through the first position n + jth (j is a natural number). When the difference from the predicted value is within the second allowable range, it is determined that the article that has passed through the first position nth has not reached the second position.It is characterized by providing the specific means to do.
  In addition, in a transport device that transports a plurality of articles one by one in succession, an article that has passed through the first position on the transport path nth (n is a natural number) is downstream of the first position. A management device that manages in the order of arrival when the position 2 arrives, and for a product that has passed through the first position nth, a first value that obtains a predicted value related to the arrival of the product at the second position And the arrival of the article to the second position when it is assumed that the article has passed the first position for the nth position. Article that has passed through the first position nth when the difference between the nth predicted value and the nth actually measured value is within a first allowable range, and second acquisition means for acquiring the actually measured value Identifies that the second position has reached the nth position, and Is outside the first allowable range, the measured value of the article that has reached the second position n + kth (k is a natural number), and the predicted value of the article that has passed the first position nth And a specifying means for specifying that an article that has passed through the first position nth has reached the second position n + kth when the difference is within a second allowable range.
According to this configuration, it is possible to specify whether or not the article that has passed through the second position nth is the article that has passed through the first position nth. For this reason, it is possible to accurately manage the articles to be conveyed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a management apparatus according to the present invention will be described with reference to the drawings.
1. About configuration
1) Overall configuration
FIG. 1 is a perspective view showing an outline of a transport system in the present embodiment. In the present embodiment, for example, a case where an appearance inspection is performed at different positions while conveying a chip resistor called “1005” (hereinafter referred to as “electronic component”) will be described as an example.
[0012]
As shown in the figure, the transport system includes a transport device 100 having a first transport unit 110 and a second transport unit 120 for transporting the electronic component 10, and an external appearance of the electronic component 10 transported by the transport device 100. , A management device (not shown) for managing the electronic component 10 based on an analysis result of image data captured by the cameras 210 and 220, and a management device for the electronic component 10 being conveyed And a recovery device 400 that recovers from the above instruction.
[0013]
First, the conveying apparatus 100 will be described.
The transport device 100 includes a first transport unit 110 that transports an electronic component 10 supplied from a supply device (not shown), and an electronic component that is disposed on the downstream side of the first transport unit 110 and received from the first transport unit 110. And a second transport unit 120 that transports 10. The 1st and 2nd conveyance parts 110 and 120 are conveying the electronic component 10 using a belt conveyor mechanism, for example. The first transport unit 110 includes a pair of rollers, a driving roller 111 and a follower roller (not shown), and an endless belt 113 stretched between the pair of rollers.
[0014]
The driving roller 111 is rotationally driven by, for example, a motor (not shown), and rotates the endless belt 113 at a predetermined speed. Similar to the first conveyance unit 110, the second conveyance unit 120 includes a pair of rollers of a driving roller 121 and a follow-up roller 122, and an endless belt 123 stretched between the pair of rollers. The drive roller 121 is rotationally driven by, for example, a motor (not shown), and rotates the endless belt 123 at a predetermined speed.
[0015]
An encoder 124 is attached to one of the rollers 121 and 122 in the second transport unit 120, for example, the follower roller 122. The encoder 124 counts the amount of change in the rotation angle of the follower roller 122. Note that there is no slip between the endless belts 113 and 123 and the driving rollers 111 and 121, and the amount of movement of the endless belts 113 and 123 on the circular path corresponds to the count value detected by the encoder 124. Shall.
[0016]
On the downstream side of the first transport unit 110, a reversing guide 130 for inverting the electronic component 10 transported by the first transport unit 110 up and down (inverted so that the front and back are reversed) and passing it to the second transport unit 120. Is provided. FIG. 2 is a front view showing the periphery of the reversing guide 130. As shown in the figure, the reversing guide 130 is curved in an arc shape so that the electronic component 10 moves along the outer periphery of the driving roller 111 of the first transport unit 110, and is disposed outside the driving roller 111. .
[0017]
Next, returning to FIG. 1, the camera will be described.
The cameras 210 and 220 are for imaging the appearance of the electronic component 10, and for example, a CCD camera is used. The cameras 210 and 220 capture a first camera 210 that images the upper surface of the electronic component 10 being conveyed by the first conveying unit 110 and a second image that images the upper surface of the electronic component 10 that is conveyed by the second conveying unit 120. And a camera 220. In addition, the camera which images the both side surfaces of the electronic component 10 is on the upstream side of the position A, and illustration and description thereof are omitted.
[0018]
A first detection sensor 211 that detects the passage of the electronic component 10 is provided in the vicinity of the upstream of the first camera 210. When the first detection sensor 211 detects the electronic component 10, the first camera 210 is electronic from above. The upper surface of the component 10 is imaged.
Near the upstream of the second camera 220, a second detection sensor 221 for detecting the passage of the electronic component 10 is provided. When the second detection sensor 221 detects the electronic component 10, the second camera 220 is electronic from above. The upper surface of the component 10 is imaged. Note that signals captured by the first camera 210 and the second camera 220 are output to the management apparatus.
[0019]
For the first and second detection sensors 211 and 221, for example, transmissive photoelectric sensors are used. As shown in FIG. 1, this transmissive photoelectric sensor includes a projector that projects laser and infrared light, and a light receiver that receives the projected laser and infrared light, and a gap between the projector and the light receiver. The electronic component 10 is detected by passing the electronic component 10 and blocking the light received by the light receiver.
[0020]
Although the details will be described later, the management device specifies the order in which the electronic component 10 that has passed the B position has passed through the A position in the order of arrival, and specifies the first and second cameras 210. , 220 is inspected to determine whether or not the outer surface of the electronic component 10 is flawed based on the image data captured, and the electronic component 10 is comprehensively evaluated from these inspection results.
[0021]
The inspection result at each position is, for example, “OK” when there is no scratch on the outer surface, and “NG” when there is a scratch. The inspection based on the imaging result of the first camera 210 is called a first inspection, and the result is called a first inspection result. An inspection based on the imaging result of the second camera 220 is referred to as a second inspection, and the result is referred to as a second inspection result.
Further, comprehensive evaluation of the electronic component 10 means that the electronic component 10 is classified as “good”, “defective”, “re-inspected” from a plurality of inspection results of the first inspection result and the second inspection result. It is to evaluate either. That is, “good” is a case where both the first inspection result and the second inspection result are “OK”, and “defective product” is a case where both the first inspection result and the second inspection result are “NG”. “Re-inspection product” is a case where one of the first inspection result and the second inspection result is “OK” and the other is “NG”. The first inspection result, the second inspection result, and the evaluation result are stored in a management table described later.
[0022]
The collection device 400 is for collecting the electronic component 10 based on the evaluation result of the management device. For example, a suction type device that sucks and collects the electronic component 10 is used. The collection device 400 includes three collection nozzles.
These nozzles include a non-defective nozzle 410 for collecting the electronic component 10 evaluated as “good”, a defective nozzle 430 for collecting the electronic component 10 evaluated as “defective”, and “re-inspection”. There are reinspection product nozzles 420 for collecting the electronic components 10 evaluated as “goods”. From the upstream side, non-defective product nozzles 410, reinspection product nozzles 420, and defective product nozzles 430 are arranged in this order. Yes. This is to prevent the electronic component 10 evaluated as a defective product from being mixed into the electronic component 10 evaluated as a non-defective product or a re-inspected product. The collection of the electronic component 10 is performed according to an instruction from the management device. This instruction is given to each nozzle 410, 420, 430 corresponding to the evaluation result.
[0023]
2) About management devices
FIG. 3 is a functional block diagram illustrating the configuration of the management apparatus.
As shown in the figure, the management apparatus 300 includes a first control unit 310, a first image processing unit 311, a second control unit 320, a second image processing unit 321, a storage unit 330, and a determination unit 340.
[0024]
The first control unit 310 is for controlling various processes related to the first inspection, and is connected to the first detection sensor 211, the first camera 210, the encoder 124, and the storage unit 330. When a detection signal is input from the first detection sensor 211, the first control unit 310 instructs the first camera 210 to capture an image and acquires the current count value from the encoder 124.
[0025]
When the first control unit 310 acquires the count value from the encoder 124, the first control unit 310 predicts the count value measured by the encoder 124 when the electronic component 10 that has passed the A position will reach the B position, and the predicted value will be described later. Register in the management table.
This predicted value is calculated as follows, for example.
Predicted value = count value of encoder 124 when passing position A + reference increase value
Here, the reference increase value is a count amount that the encoder 124 measures (counts) while the electronic component 10 reaches the B position from the A position without any trouble. That is, when the electronic component 10 is transported from the A position to the B position without any trouble during transport, the count value of the encoder 124 acquired when the A position is reached from the count value of the encoder 124 acquired when the B position is reached. Subtracted value. The reference increase value uses an average value measured in advance by a test or the like, or uses a value measured after the operation state of the transfer apparatus 100 is stabilized.
[0026]
The first image processing unit 311 processes a signal captured by the first camera 210. The processing method performed here is a known method for converting an input analog signal into a digital signal and binarizing the data, for example, to detect scratches. The first image processing unit 311 inspects for the presence or absence of scratches by the above processing, and stores the first inspection result in the management table of the storage unit 330.
[0027]
The second control unit 320 is for controlling various processes related to the second inspection, and is connected to the second detection sensor 221, the second camera 220, the encoder 124, and the storage unit 330. Similar to the first control unit 310, when the detection signal is input from the second detection sensor 221, the second control unit 320 instructs the second camera 220 to capture an image and acquires the current count value from the encoder 124. Then, this count value is registered in the management table as an actual measurement value when the electronic component 10 reaches the B position.
[0028]
Similar to the first image processing unit 311, the second image processing unit 321 processes signals picked up by the second camera 220, inspects for the presence of scratches on the outer surface of the electronic component 10, and performs first image processing. Similarly to the unit 311, the result is stored in the management table of the storage unit 330.
The storage unit 330 stores data when the first image processing unit 311 and the second image processing unit 321 convert analog signals sent from the cameras 210 and 220 into digital signals or perform image processing. And a management table. Here, the management table will be described.
[0029]
FIG. 4 is a diagram showing the contents of the management table. As shown in the figure, the management table T1 includes “work ID”, “predicted value”, “actual value”, “difference”, “work recognition”, “inspection result 1”, “inspection result 2”, and “evaluation”. A total of 8 columns of “Result” are provided.
“Work ID” is an identification number of the electronic component 10 transported by the first transport unit 110, and the maximum value N of the work ID is set to be larger than the maximum number of electronic components 10 arranged on the transport device 100. ing. As the work ID, a natural number is used. When the work ID exceeds the maximum value N, the work ID starts from 1 again.
[0030]
The “predicted value” is stored from the first control unit 310, for example “205”, and the “measured value” is stored from the second control unit 320, for example “202”. Further, “inspection result 1” stores the first inspection result from the first image processing unit 311 and “inspection result 2” stores the second inspection result from the second image processing unit 321. The “difference”, “work recognition”, and “evaluation result” fields are stored from the determination unit 340.
[0031]
Next, the determination unit 340 will be described. The determination unit 340 calculates a difference between the n-th actual measurement value and the predicted value in the management table T1, and if the difference is within a predetermined range, the electronic component 10 that has passed the A-th position and the B-position If the electronic component 10 that has passed through n is the same article, “OK” is entered in the “work recognition” column of the management table T1, and if the difference is out of range, the electronic component 10 Judgment is made as to whether or not the item is missing, and “missing item” is stored in the “work recognition” column in the case of missing item, and “NG” is stored in the “work recognition” column in other cases.
[0032]
The determination as to whether or not the electronic component 10 is out of stock will be described later. The difference between the measured value “n” in the “work ID” column of the management table T1 and the predicted value “n + j” is within a predetermined range. In the case of the above, it is determined that the electronic component 10 that has passed the nth position A is missing. The above j is a natural number, and it is assumed that j electronic components 10 that have passed through the A position are continuously missing.
[0033]
The determination unit 340 comprehensively evaluates the electronic component 10 from the inspection result 1 and the inspection result 2 in the management table T1. As described above, there are three types of evaluation contents: “non-defective product”, “defective product”, and “re-inspection product”. The determination unit 340 instructs the nozzles 410, 420, and 430 of the collection device 400 to collect the electronic component 10 based on the evaluation result. If the electronic component 10 is missing, “-” is stored in the “evaluation result” column in the management table T1.
[0034]
3) Processing contents of the management device
a. First control unit
FIG. 5 is a flowchart showing the processing contents of the first control unit 310. As shown in the figure, the first control unit 310 first sets the variable n indicating the work ID to “1”, and if there is a detection signal that detects the passage of the electronic component 10 from the first detection sensor 211, The camera 210 is instructed to take an image, and the current count value is acquired from the encoder 124 (steps S110, S120; YES, S130, S140).
[0035]
Next, a reference increase value is added to the acquired count value to calculate a predicted value at which the electronic component 10 detected by the first detection sensor 211 reaches the B position, and then the predicted value is used as a work in the management table T1. It is stored in the “predicted value” field whose ID is n (steps S150 and S160).
Then, 1 is added to the variable n (step S170). If the variable n after addition is smaller than the maximum value N, the process proceeds to step S120 (step S180; YES), and the variable n after addition is equal to the maximum value N. In that case, the process proceeds to step S110 (step S180; NO).
[0036]
b. Second control unit
FIG. 6 is a flowchart showing the processing contents of the second control unit 320. As shown in the figure, the second control unit 320 first sets the variable n indicating the work ID to “1”, and if there is a detection signal that detects the passage of the electronic component 10 from the second detection sensor 221, The camera 220 is instructed to take an image, and the current count value is acquired from the encoder 124 (steps S210, S220; YES, S230, S240).
[0037]
Next, the acquired count value is stored as an actual measurement value in the “actual measurement value” field whose work ID is n in the management table T1 (step S250). Then, 1 is added to the variable n. If the variable n after the addition is smaller than the maximum value N, the process proceeds to step S220 (step S270; YES), and if the variable n after the addition is equal to the maximum value N, the step is performed. The process moves to S210 (step S270; NO).
[0038]
c. Judgment part
FIG. 7 is a flowchart showing the processing contents of the determination unit 340. As shown in the figure, the determination unit 340 first sets the variable n indicating the work ID to “1” and determines whether or not the actual measurement value corresponding to the work ID of n + L (natural number) is stored in the management table T1. Determination is made (steps S310 and S320). Here, it is determined whether or not an actual measurement value with a work ID of n + L is stored. When determining whether an electronic component 10 with a work ID of n described later is missing, the determination accuracy is increased. This is because the actual value corresponding to the work ID n + L is used (details will be described in step S420).
[0039]
If the actual value corresponding to the work ID n + L is not stored in the management table T1, the process waits until the actual value corresponding to the work ID n + L is stored (step S320; NO).
On the other hand, when an actual measurement value corresponding to the work ID n + L is stored, the difference between the predicted value of the work ID n and the actual measurement value is calculated, and the work ID in the management table T1 is “difference” of n. It stores in the column (step S320; YES, S330).
[0040]
Next, it is determined whether or not the calculated difference is within an allowable range (step S340). This allowable range is determined based on the unevenness of the conveyance speed, the distance between the A position and the B position, the accuracy of the encoder 124, and the like. Actually, the preliminary operation is performed and a statistical value is adopted and determined. In the present embodiment, the permissible range is greater than −10 and less than 10.
[0041]
1) The case where the electronic component 10 is conveyed from the A position to the B position as planned will be described. That is, when the above difference is within the allowable range, the electronic component 10 that has passed the nth position through the A position has successfully reached the B position, and the work ID of the work table in the management table T1 is “work recognition”. “OK” is stored in the column, and an evaluation process for evaluating the electronic component 10 is performed (steps S340; YES, S470, and S480).
[0042]
FIG. 8 is a flowchart showing the processing contents of the evaluation processing.
In the evaluation process, as shown in the figure, first, it is determined whether or not the inspection result 1 with the work ID n is “OK” (step S481).
When the inspection result 1 is “OK”, it is determined whether or not the inspection result 2 with the work ID “n” is “OK”. Then, “non-defective product” is stored in the “evaluation result” field whose work ID is n in the management table T1 (step S481; YES, S482; YES, S483), and the process proceeds to step S490 in FIG.
[0043]
Conversely, in step S482, if the inspection result 2 is not “OK”, that is, “NG” (for example, when the work ID is 5 in the management table T1), the “evaluation result” where the work ID in the management table T1 is n. "Re-inspection product" is stored in the "" column (step S482; NO, S485), and the process proceeds to step S490 in FIG.
On the other hand, in step S481, if the inspection result 1 is not “OK”, that is, “NG”, it is determined whether or not the inspection result 2 with the work ID n is “OK”, and if it is “OK”. Then, “re-inspection product” is stored in the column of “evaluation result” whose work ID is n in the management table T1 (step S481; NO, S484; YES, S485), and the process proceeds to step S490 in FIG.
[0044]
Conversely, in step S484, if the inspection result 2 is not “OK”, that is, “NG” (for example, if the work ID is 2 in the management table T1), the “evaluation result” where the work ID in the management table T1 is n. "Defective product" is stored in the "" column (step S484; NO, S486), and the process proceeds to step S490 in FIG.
Returning to FIG. 7, in step S490, the collection device 400 is instructed to collect the electronic component 10 based on the evaluation result, and 1 is added to the variable n of the work ID (step S500). Then, it is determined whether or not the variable n after the addition is smaller than the maximum value N. If it is smaller, the process proceeds to step S320 (step S400; YES). If they are equal, the process proceeds to step S310 (step S400; NO).
[0045]
2) A case where the electronic component 10 that has passed the A position has not reached the B position as planned will be described. Here, it is assumed that the electronic component 10 that has passed through the A position to the fourth position (work ID is 4) is missing, and will be described below with reference to FIG. This figure is a diagram showing the contents of the management table T1 when processing of the determination unit 340 at the time of shortage is performed.
In step S340 in FIG. 7, if the difference calculated in the previous step (difference of work ID 4 is “−101”) is out of the allowable range, variable j used to determine the shortage of electronic component 10. It is determined whether (natural number) is 1 and the difference between the actually measured value with the work ID n and the predicted value with the work ID n + j is within an allowable range (steps S340; NO, S350, S360).
[0046]
If the difference is not within the allowable range, it is determined whether or not the variable j after addition obtained by adding 1 to the variable j is smaller than the maximum value J. If smaller, the process proceeds to step S360 (step S360; NO, S370, S380; YES). Here, the difference between the actually measured value of n and the predicted value of n + j is used when, for example, j electronic components 10 passing through the A position from the nth to the n + jth are missing due to some reason. This is because of consideration. Note that the maximum value J is a numerical value set in advance, and is set after grasping how long the shortage continues by a preliminary test or the like.
[0047]
If the variable j is equal to the maximum value J in step S380, “NG” is entered in the “work recognition” column with the work ID n in the management table T1, and “re-inspection product” is entered in the “evaluation result” column. Each is stored and it progresses to step S490 (step S380; NO, S390).
On the other hand, if the difference (in this case, 2) between the measured value of the work ID n and the predicted value of n + j (j is 1 in FIG. 9) is within the allowable range in step S360, The variable l (natural number) that increases the determination accuracy is set to 1, and the difference between the actually measured value of the work ID n + 1 (here, 5) and the predicted value of the work ID n + 1 + j (here 6) (here) Whether or not −11 is within the second allowable range (here, greater than −20 and less than 20) is determined (step S360; YES, S410, S420).
[0048]
Here, the second permissible range that is wider than the permissible range up to now is set because if there is a shortage during transport, the subsequent electronic component 10 may still be affected by transport delay, etc. Because there is. However, if it has been confirmed by a preliminary test or the like that a missing part occurs during transportation without affecting the subsequent electronic component 10, it is not necessary to set the second allowable range. Use it.
[0049]
If the difference is within the second allowable range in step S420, if the variable l is smaller than the maximum value L, 1 is added to the variable l and the process proceeds to step S420 (step S420; YES, S430; YES, S460). This is because there is a possibility that the predicted value with the work ID n + j coincides with the actually measured value with the work ID n, and whether the difference between the actually measured value and the predicted value for the L pieces thereafter is within the second allowable range. Examine the accidental nature.
[0050]
Conversely, when the variable l is equal to the maximum value L in step S430, it is a case where j pieces of work IDs from n to n + j−1 are missing, and the “work recognition” of the work ID n. “Missing product” is stored in the column, “−” is stored in the “Evaluation result” column, the measured value after the work ID is n and the inspection result 2, and the actual value and the inspection result after the work ID is n + 1. (Step S430; NO, S440, S450).
[0051]
In step S420, if the difference is outside the second allowable range (NO), this is a phenomenon that is unlikely to occur in actual operation, but step S390 is performed so that the electronic component 10 having the work ID n is not included in the non-defective product. Proceed to
When the management device is configured as described above, even when the electronic component 10 that has passed through the A position n-th is missing before reaching the B position, the subsequent electronic component 10 can be identified. Even when the electronic component 10 is comprehensively evaluated using the inspection results of the A position and the B position, the electronic component 10 can be accurately evaluated.
[0052]
(Modification)
As described above, the present invention has been described based on the embodiments. However, the content of the present invention is not limited to the specific examples shown in the above embodiments, and for example, the following modifications are implemented. be able to.
(1) About transported body
In each of the above embodiments, the case where an electronic component is used as an article and the appearance inspection is performed has been described as an example. However, other articles, for example, pharmaceuticals such as tablets and capsules, small size used in precision machines, etc. Precision machine parts such as shafts may be used. Such a case is also effective in comprehensive evaluation using the results of inspection at different positions on the conveyance path.
[0053]
(2) About the first position and the second position
In the above embodiment, as shown in FIG. 1, the article is delivered between the first position and the second position, that is, between the first transport unit and the second transport unit. The first transport unit and the second transport unit may be the same transport unit. In this case, the delivery of the article is not performed between the first position and the second position.
[0054]
On the other hand, in the embodiment, the management method of the articles passing through the first position and the second position has been described. However, for example, the third position and the fourth position other than the first and second positions. Alternatively, the same article management may be performed.
Furthermore, in the embodiment, the camera for inspecting the appearance of the electronic component is installed at the A position and the B position. However, other inspections may be performed, and other processes that are not inspections may be performed. . As another example of the process, for example, a sticker indicating the article number may be attached to the front and back of the article. Of course, in this case as well, an article that has passed through the first position nth must be specified when passing through the second position.
[0055]
(3) Count value
In the above embodiment, the count value of the encoder attached to the roller for rotating the endless belt of the belt conveyor mechanism is used as the measurement value for measuring the amount of change that changes according to the feed of the conveyance. The same can be implemented using An example of such a value is time. In this case, the time passing through the first position and the time passing through the second position are acquired from the time counter, and the article is conveyed from the first position to the second position as the reference increase value. The elapsed time may be used.
[0056]
(4) Predicted values and measured values
In the above embodiment, the predicted value and the actually measured value are predicted or actually measured based on the arrival time at the second position. That is, the predicted value calculates the predicted value of arrival at the second position by adding the reference increase value to the count value of the encoder when passing through the first position for the article that has reached the second position, The actually measured value is the count value of the encoder when the second position is reached.
[0057]
However, the predicted value and the actually measured value may be predicted and actually measured based on other criteria. For example, the amount of change during conveyance from the first position to the second position may be used.
More specifically, the predicted value may be obtained in advance by a preliminary test or calculation for a change amount by which the article is conveyed from the first position to the second position. When obtaining from the preliminary test, a plurality of values obtained by subtracting the count value when the first position is reached from the count value reaching the second position may be measured, and the average value may be used as the predicted value.
[0058]
In addition, the actual measurement value is calculated based on the count value when the second position reaches the first position, assuming that the article that has passed the nth position through the first position has also passed the nth position as it is. A value obtained by subtracting the count value at the time of arrival may be used.
Although it seems that the embodiment and the modification using the amount of change during the conveyance from the first position to the second position are different from each other at first glance, , Doing the same process. Hereinafter, it will be described that these are the same processing.
[0059]
First, the relationship between the encoder count value when passing through the first position (this count value is K1) and the encoder count value when reaching the second position (this count value is K2) is as follows:
K2 = K1 + L (1)
It is. L is a count value of the encoder required for the conveyance of the article from the first position to the second position.
[0060]
In the embodiment, L obtained in advance by a preliminary test or the like is added to K1 as a predicted value, and K2 is set as an actually measured value. However, (1)
L = K2-K1
If it deform | transforms like this, it will become the same as the process demonstrated as a modification of embodiment above.
[0061]
That is, in the embodiment and the modification thereof, for an article that has passed through the first position, the predicted value related to the arrival of the article at the second position is acquired, and the nth position is reached at the second position. The measured value required for transporting the article from the first position to the second position when it is assumed that the article has passed the first position n-th is acquired. .
[0062]
(5) Conveying device
In the above embodiment, the belt conveyor type is used as the conveying device for conveying the article, but other types may be used. As such an example, a disk-shaped first rotating body that rotates by adsorbing an article to the outer peripheral surface, and a disk-shaped second rotating body that receives the article from the first rotating body and rotates by adsorbing the outer surface. And when the article is delivered from the first rotating body to the second rotating body, the article adsorbed on the outer peripheral surface of the first rotating body is opposite to the surface on which the article is adsorbed. There is a transport device or the like in which the front and back of the transported body are reversed by suction.
[0063]
(6) About identification of article
In the above embodiment, the case where the nth article passing through the first position is lost has been described. Even if the mixed article is referred to as “mixed article”), the article that has passed through the first position nth can be identified when it reaches the second position. In this case, when the difference between the nth predicted value and the nth actually measured value is outside the predetermined range, the measured value of the n + kth (k is a natural number) article and the predicted value of the nth article are When the difference is within the predetermined range, it may be specified that the article that has passed through the first position nth has passed the second position n + kth.
[0064]
More specifically, the following four steps can be changed in FIG.
a. In step S360, in the case of a shortage, the difference between the actually measured value with the work ID n and the predicted value with the work ID n + j is calculated. It changes so that the difference with the predicted value of work ID n may be calculated.
b. In step S420, in the case of a shortage, the difference between the actual measurement value of the work ID n + 1 and the predicted value of the work ID n + 1 / j is calculated, but in the case of mixing, the actual value of the work ID n + 1 / j and It changes so that the difference with the predicted value of work ID n + 1 may be calculated.
[0065]
c. In step S440, in the case of a missing item, “Missing product” is stored in the workpiece recognition with the work ID “n”, but in the case of mixing, “Mixed product” is stored in the workpiece recognition with the work ID “n”. Change to
d. In step S450, in the case of a shortage, the measured value of the work ID n and later and the inspection result 2 are shifted to the work ID n + 1, but in the case of mixing, the predicted value and the inspection result 1 of the work ID n and later. Is changed so that the work ID is shifted to n + 1.
[0066]
By configuring as described above, the first position can be obtained even when foreign matter is mixed in front of the nth article before the article that has passed through the first position reaches the second position. Can be identified.
[0067]
【The invention's effect】
  As described above, in the article management method according to the present invention, an article that has passed through the first position on the conveyance path n-th (n is a natural number) is the second position downstream of the first position. An article management method for managing articles in order of arrival at the time of arrival, and obtaining a predicted value related to arrival of the article to the second position for the article that has passed through the first position nth And for the article that has reached the second position at the second position, from the first position of the article to the second position when it is assumed that the article has passed the first position through the first position. The second step of acquiring the actual measurement value required for the conveyance of the first and the difference between the nth predicted value and the nth actual measurement value isFirst toleranceWhen it is within the range, the article that has passed through the first position nth is identified as having passed the second position nthWhen the difference is outside the first allowable range, the measured value of the article that has reached the second position in the second position and the article that has passed through the first position n + jth (j is a natural number). When the difference from the predicted value is within the second allowable range, it is determined that the article that has passed through the first position nth has not reached the second position.And a third step.Also, an article management method for managing articles that have passed through the first position on the transport path nth (n is a natural number) in the order of arrival when the second position downstream of the first position is reached. A first step of obtaining a predicted value regarding the arrival of the article at the second position for the article that has passed through the first position, and the nth arrival at the second position; Second to obtain an actual measurement value required for transporting the article from the first position to the second position when it is assumed that the article has passed through the first position nth. And when the difference between the n-th predicted value and the n-th actual measured value is within a first allowable range, an article that has passed through the first position n times the second position. nth pass is identified and the difference is outside the first tolerance range When the difference between the measured value of the article that has reached the (n + k) th (k is a natural number) in the second position and the predicted value of the article that has passed through the first position is within the second allowable range. And a third step of identifying that the article that has passed through the first position nth has reached the second position n + kth.
For this reason, it can be specified whether the article that has passed through the first position nth is the article that has passed through the second position nth. For this reason, it is possible to accurately manage the articles to be conveyed.
[0068]
  In addition, the management device according to the present invention is configured to transfer an article that has passed through the first position on the conveyance path nth (n is a natural number) in the conveyance device that conveys a plurality of articles one by one. A management device that manages in order of arrival when a second position that is downstream of the first position arrives, and for the article that has passed through the first position for the nth time, the article reaches the second position. The first acquisition means for acquiring a predicted value for the article and the article that has reached the nth position of the second position, the article of the article when it is assumed that the article has passed the nth position of the first position A second acquisition means for acquiring an actual measurement value related to arrival at the second position, and a difference between the n-th predicted value and the n-th actual measurement value isFirst toleranceWhen it is within the range, it is determined that the article that has passed through the first position nth has reached the second position nth.When the difference is outside the first allowable range, the measured value of the article that has reached the second position in the second position and the article that has passed through the first position n + jth (j is a natural number). When the difference from the predicted value is within the second allowable range, it is determined that the article that has passed through the first position nth has not reached the second position.And a specific means for performing.
  In addition, in a transport device that transports a plurality of articles one by one in succession, an article that has passed through the first position on the transport path nth (n is a natural number) is downstream of the first position. A management device that manages in the order of arrival when the position 2 arrives, and for a product that has passed through the first position nth, a first value that obtains a predicted value related to the arrival of the product at the second position And the arrival of the article to the second position when it is assumed that the article has passed the first position for the nth position. Article that has passed through the first position nth when the difference between the nth predicted value and the nth actually measured value is within a first allowable range, and second acquisition means for acquiring the actually measured value Identifies that the second position has reached the nth position, and Is outside the first allowable range, the measured value of the article that has reached the second position n + kth (k is a natural number), and the predicted value of the article that has passed the first position nth And a specifying means for specifying that the article that has passed through the first position nth has reached the second position n + kth when the difference is within the second allowable range.
For this reason, it can be specified whether the article that has passed through the first position nth is the article that has passed through the second position nth. For this reason, it is possible to accurately manage the articles to be conveyed.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a transport system according to an embodiment of the present invention.
FIG. 2 is a front view showing the periphery of a reversing guide in the embodiment of the present invention.
FIG. 3 is a functional block diagram showing a configuration of a management device according to the embodiment of the present invention.
FIG. 4 is a diagram showing the contents of a management table in the embodiment of the present invention.
FIG. 5 is a flowchart showing processing contents of a first control unit in the embodiment of the present invention.
FIG. 6 is a flowchart showing processing contents of a second control unit in the embodiment of the present invention.
FIG. 7 is a flowchart showing the processing contents of a determination unit in the embodiment of the present invention.
FIG. 8 is a flowchart showing processing contents of evaluation processing in the embodiment of the present invention.
FIG. 9 is a diagram showing the contents of a management table when the determination unit according to the embodiment of the present invention processes when there is a shortage.
[Explanation of symbols]
10 Electronic components
100 Conveying device
110 1st conveyance part
120 Second transport section
130 Guide part
210 First camera
220 Second camera
300 Management device
310 1st control part
311 First image processing unit
320 Second control unit
321 Second image processing unit
330 storage unit
340 judgment part
400 collection device

Claims (6)

An article management method for managing an article that has passed through a first position on a conveyance path nth (n is a natural number) in the order of arrival when the article reaches a second position downstream from the first position. ,
A first step of obtaining a predicted value related to the arrival of the article at the second position for the article that has passed through the first position nth;
Conveyance of the article from the first position to the second position when it is assumed that the article has passed the first position nth for the article that has reached the second position. A second step of acquiring actual measurement values required for
When the difference between the nth predicted value and the nth actually measured value is within the first allowable range, the article that has passed the first position nth passes the second position nth. When the difference is outside the first allowable range, the measured value of the article that has reached the second position at the second position and the first position at the (n + j) th (j is a natural number) A third step of identifying that the nth article passing through the first position has not reached the second position when the difference from the predicted value of the article passed through is within a second allowable range ; An article management method comprising: An article management method for managing an article that has passed through a first position on a conveyance path nth (n is a natural number) in the order of arrival when the article reaches a second position downstream from the first position. ,
A first step of obtaining a predicted value related to the arrival of the article at the second position for the article that has passed through the first position nth;
Conveyance of the article from the first position to the second position when it is assumed that the article has passed the first position nth for the article that has reached the second position. A second step of acquiring actual measurement values required for
When the difference between the nth predicted value and the nth actually measured value is within the first allowable range, the article that has passed the first position nth passes the second position nth. When the difference is outside the first allowable range, the measured value of the article that has reached the (n + k) th position (k is a natural number) and the first position is the nth position. A third step of specifying that an article that has passed through the first position nth has reached the second position n + k when the difference from the predicted value of the article that has passed is within a second allowable range. When
An article management method comprising: The predicted value and the measured value, the management method of an article according to claim 1 or 2, characterized in that the area is represented by the measured values obtained by measuring the amount of change that varies according to the feed for conveying the article. The transport path includes at least the first transport path and the second transport path, and an article transported on the first transport path passes through the first position, and is on the second transport path. The article management method according to any one of claims 1 to 3 , wherein the article conveyed is passed through the second position. In a transport device that transports a plurality of articles one by one in succession, a second article located downstream from the first position is an article that has passed through the first position on the conveyance path nth (n is a natural number). It is a management device that manages in order of arrival when a position arrives,
First acquisition means for acquiring a predicted value related to the arrival of the article at the second position for the article that has passed through the first position nth;
With respect to the article that has reached the second position in the second position, an actual measurement value related to the arrival of the article at the second position when the article has passed the first position through the first position is acquired. A second acquisition means;
When the difference between the n-th predicted value and the n-th measured value is within the first allowable range, the article that has passed the first position n-th reaches the second position n-th. When the difference is outside the first allowable range, the measured value of the article that has reached the second position at the second position and the first position at the (n + j) th (j is a natural number) And a specifying unit that specifies that the nth article that has passed through the first position has not reached the second position when a difference from a predicted value of the article that has passed is within a second allowable range. Management device characterized by. In a transport device that transports a plurality of articles one by one successively, a second article that is downstream of the first position is an article that has passed through the first position on the transport path nth (n is a natural number). It is a management device that manages in order of arrival when a position arrives,
First acquisition means for acquiring a predicted value related to the arrival of the article at the second position for the article that has passed through the first position nth;
For the article that has reached the second position in the second position, obtain an actual measurement value regarding the arrival of the article at the second position when it is assumed that the article has passed the first position through the first position. A second acquisition means;
When the difference between the nth predicted value and the nth actually measured value is within the first allowable range, the article that has passed through the first position nth reaches the second position nth. When the difference is outside the first allowable range, the measured value of the article that has reached the (n + k) th (k is a natural number) the second position and the first position nth A specifying means for specifying that an article that has passed through the first position has reached the second position n + k when the difference from the predicted value of the article that has passed is within a second allowable range;
A management apparatus comprising:

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