JPH02126979A - Method for detecting defective and device for rejecting defective - Google Patents

Abstract

PURPOSE:To reduce the misjudgement of the good product as the defective at the time of staring the work by setting controlling range to the fixed permissible max. width only during executing the detection to the specific number of the products since starting the work and after that, to prevent misjudgement of a detective as good product by setting the controlling range width to narrow based on the moving average value. CONSTITUTION:Weight of plural products are individually measured and detected whether the weight of each concerned product is in the prescribed controlling range or not, and the product, of which the weight is in outside of the controlling range, is relatively judged as the defective. Then, till measuring the weights of the first specific number of two or more products since starting the weight measuring work, the above controlling range is set to the permissible fixed max. width. After measuring the weights of the first specific number of the products, with average value of the weights of the second specific number of two or more products judged as non-defective by measuring the weights just before setting the controlling range, the new controlling range is set in order. In this result, the controlling range can be narrowed and the misjudgement of the defective as the good product can be prevented. Further, the misjudgement of the good product as the defective at the time of starting the work can be reduced.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention measures the weight and dimensions of an item to be inspected in the inspection process of a production line, etc., and measures the measured value outside a predetermined control area. The present invention relates to a method and apparatus for determining that an item is defective in certain cases. The present invention also relates to a device in which it is determined whether or not the number of stars of a packaged article matches a predetermined number.

(b) Conventional technology Parts and finished products (hereinafter collectively referred to as "articles") produced on the production line of a factory, etc. are generally packaged individually or as a collection of multiple pieces, and are assembled at an assembly factory. and supplied to the general market. Therefore, an inspection process is usually installed in the final process to distinguish between good and defective products and eliminate the defective products. In such an inspection process, the inspection target and quality differ depending on the type of article to be inspected, but in general, the suitability of the weight and dimensions of the article is inspected.

Weight inspection equipment that inspects the weight of items has traditionally used a fixed standard value that takes the standard weight of the item as a reference value and sets an acceptable range or control range for non-defective items based on the variation in the actual weight. method (abbreviated as fixed reference method).

) has been adopted.

However, the basic idea of this fixed standard method is to set a control range using statistical methods assuming an infinite population, so if it is applied as is, the range of acceptable products will be extremely wide. This may result in a large amount of defective products being mixed into the product. In order to avoid such problems, appropriate control areas are established, taking into account the extent to which good products are excluded and the risk of defective products being mixed in. The drawback is that the test function cannot be developed.

In particular, among the physical properties of raw materials supplied to the manufacturing process, when the physical properties that affect the weight and dimensions of the product are likely to fluctuate, the fixed standard method either widens the control range or frequently manually sets the standard value. This increases the possibility that defective products will be mixed into the product, or requires additional manpower, and if the timing of the control of the reference value is incorrect, a defective product may be rejected as a non-defective product. Mistakes are also likely to occur.

Therefore, as a method to solve the above-mentioned problems, [we measure the weight of the products to be produced and check whether the weight is within the control range in the inspection process, and distinguish between non-defective products and defective products]. When eliminating defective products, the above-mentioned control range is set using the average value calculated from the weights of 3 to 20 items that were recently measured and determined to be good. A method for detecting defective products in a production line, characterized by determining whether the product weight is good or bad based on a control area. ' has been proposed.

(c) Problems to be Solved by the Invention As mentioned above, in the conventional technology, the control area is defined as the average value (hereinafter abbreviated as moving average value) of the weights of a plurality of items that were determined to be good products immediately before. ), so even if the control area is narrowed, a certain degree of inspection accuracy is guaranteed.

However, it is known from experience that the condition and condition of a production line (equipment) fluctuates depending on various factors such as weather, temperature, humidity, and familiarity of mechanical parts, and in particular changes greatly between the start and end of the work day. It is being

The graph shown in FIG. 2 shows this fluctuation state.

As is clear from this graph, the control area A at the start of the workday is located at a high place, whereas the control area B at the end of the workday is located at a low place.

Therefore, the data at the end of the previous day's workday is not useful at the start of the day's workday. In other words, if there is little overlap between control area A and control area B, if you start work based on control area B at the end of the previous day's workday, most of the items that should have been good will end up being determined to be defective. .

Note that if the width of the control area itself is widened in order to solve this difficulty, there is a risk that the risk that a defective product will be determined as a good product will increase.

The present invention has been made in view of the problems of the conventional technology, and it is possible to improve the control area by setting the control area to a fixed maximum width only during the period when a specific number of articles are inspected from the start of the work day. This is intended to prevent defective products from being judged as non-defective by reducing the number of non-defective products at the time of the test and by setting the width of the control range narrower based on the moving average value.

(d) Means for Solving the Problem The first main invention is to measure the weight of a plurality of articles individually, detect whether the weight of each article is within a predetermined control range, and measure the weight of each article individually. In the defective product detection method in which articles located outside the control area are determined to be relatively defective, from the start of the weight measurement operation until the weights of two or more first specific number of articles are measured, After setting the control area to a fixed maximum allowable width and measuring the weight of the first specific number of items, two or more second items whose weights were measured immediately before and determined to be non-defective are This method is characterized in that new control areas are sequentially set based on the average value of the weights of a specific number of articles.

The second main invention is a transfer means for continuously or intermittently transferring a plurality of articles, a weight measuring means for individually measuring the weight of the articles transferred by the transfer means, and a weight measuring means for individually measuring the weight of the articles transferred by the transfer means. It includes a detection means for detecting whether or not the article is within a predetermined control area, a determination means for determining that an article whose weight is outside the control area is defective, and an exclusion means for rejecting an article determined to be defective. A defective product detection/elimination device according to the present invention includes a counting means for counting a first specific number of two or more articles from the start of a weight measuring operation, and a counting means for counting a first specific number of articles from the start of a weight measurement operation, and a fixed counter to which each of the first specific number of articles is fixed. a detection means for detecting whether or not the article is in a control range; and an average value calculation means for calculating an average value of the weights of two or more second specific number of articles whose weights were measured immediately before and determined to be non-defective. , a moving pipe filling setting means for setting a new management area based on the average value.

The third main invention is to individually measure the dimensions of a plurality of articles to detect whether the dimensions of each article are within a predetermined control area, and to detect articles whose dimensions are outside the control area. In a defective product detection method that determines a product to be relatively defective, from the start of a dimension measurement operation until the dimensions of a first specific number of two or more products are measured, the control area is set to a fixed maximum allowable range. After measuring the dimensions of the first specified number of articles, the average value of the dimensions of two or more second specified number of articles whose dimensions were measured immediately before and determined to be non-defective. , is characterized by sequentially setting new management areas.

The fourth main invention is a transfer means for continuously or intermittently transferring a plurality of articles, a dimension measuring means for individually measuring the dimensions of the articles transferred by the transfer means, and a size measuring means for individually measuring the dimensions of the articles transferred by the transfer means; a detection means for detecting whether or not the article is within the control area; a determination means for determining an article whose dimensions are outside the control area as defective; and an exclusion means for rejecting the article determined to be defective. A defective product detection/elimination device according to the present invention includes a counting means for counting a first specific number of two or more articles from the start of a dimension measurement operation, and a constant management in which each of the first specific number of articles is fixed. a detection means for detecting whether or not it falls within the range; and an average value calculation means for calculating the average value of the dimensions of two or more second specific number of articles whose dimensions were measured immediately before and determined to be non-defective; The apparatus is characterized in that it includes a moving pipe filling setting means for setting a new management area based on the average value.

(e) Effect In the first main invention, from the start of the weight measurement operation until the weight of two or more first specific number of articles is measured, that is, as shown in FIG. Until data is collected, the initial management area is set to the fixed maximum width C allowed,
After measuring the weight of the first specific number of articles, a new one is sequentially measured based on the moving average of the weights of the two or more second specific number of articles whose weight was measured immediately before and determined to be non-defective. Since management areas are set, the initial management area C includes the management area A at the start of the workday and the management area B at the end of the workday.

Therefore, at the start of business, articles that should originally be considered good are not determined to be defective.

Moreover, since the control area is set based on the moving average value after initial data is collected, there is no risk that a defective product will be determined as a non-defective product.

The functions of the other main inventions are not substantially different from those of the first main invention.

(F) Embodiment Figures 3 to 6 show a defective product detection and elimination device as a first embodiment of the present invention, in which Figure 3 is a schematic front view of the device, and Figure 4 shows the overall configuration. FIG. 5 is a schematic block diagram, FIG. 5 is a block diagram showing details of the memory, and FIG. 6 is a flow chart for explaining the operation.

In FIG. 3, reference numeral 1 denotes a main body of the apparatus, and a weight measuring section 2 is provided at the center lower part of the main body, and a weighing conveyor 3 is provided above the weight measuring section 2.

A load cell 4 as shown in FIG. 4 is connected to the weighing conveyor 3, and packaged boxed caramels 5 as articles to be inspected are placed one by one on the weighing conveyor 3 and transferred. Its weight is then measured.

A supply conveyor 6 for supplying uninspected boxed caramels 5 onto the weighing conveyor 3 is provided on the upstream side of the weighing conveyor 3 along the transport direction of the boxed caramels 5. On the downstream side, a sorting conveyor 7 is provided for sorting the boxed caramels 5 after inspection into good products and defective products (insufficient number or excessive number).

The sorting conveyor 7 is provided with a defective product discharging device 8 for discharging boxed caramels 5 that have been determined to be defective to the side.

A photosensor 9.10 for detecting the presence of the boxed caramel 5 is provided near the downstream side of each of the supply conveyor 6 and the weighing conveyor 3. Further, 11 is a metering control section, and lt is a level adjuster.

Next, the control circuit will be explained mainly with reference to FIGS. 4 and 5.

A DC amplifier 13 is connected to the load cell 4 , and an analog/digital converter (A/D converter) 15 is connected to the DC amplifier 13 via a filter 14 . The A/D converter 15 also has an input/output interface (I1
A microprocessor (MPU) 18 is connected via a 0 interface) 16 and a pass line 17.

Further, the I10 interface 16 is connected to a numeric keypad 19 for inputting and setting the number of items to be inspected, reference values, etc., as well as a defective product ejection device 8, a display device 20, a printer 23, etc.

Further, the pass line 17 includes a random access memory (RAM) 21 in which various types of data are temporarily stored.
22 read-only memories (ROMs) are connected to the controller to store control programs and fixed data.

Next, the operation of this apparatus will be explained mainly based on the flowchart of FIG.

First, operation is started in step S1, and in step S2, the weight of each boxed caramel 5 is measured by the weighing conveyor 3, and data is collected. At this time, it is determined whether each boxed caramel 5 is within the initial control area C in FIG. 1 (step S3), and the boxed caramel 5 is
is in the initial management area C, the data is stored in the data memory DMn (RAM21) (step 3).
4) The number of non-defective products is counted (step S5).

This process is then repeated until the number n of non-defective products reaches the first specific number n0 (specifically, 10) (step S7).

In addition, in the step S3, when it is determined that the boxed caramel 5 is outside the initial control area C, that is, when the weight of the boxed caramel 5 is greater than the initial upper limit value or smaller than the initial lower limit value. , the defective product discharge device 8
operates, and the defective boxed caramel 5 is removed to the outside (step S6). At this time, defective products are not counted.

Then, the average value m of the weights of the boxed caramels 5 that were determined to be good in the process is determined (step S8),
The weighted average value m plus the movement management width (m+b) is the upper limit of the movement management area, and m-b is the lower limit of the movement management area (
In step S9), the absolute value of the movement management area is 2b. Note that the movement management width may be fixedly set by manual setting, or may be determined from variations in initial data.

Then, at step SIO, each boxed caramel 5
is weighed and data collected.

At this time, it is determined whether each boxed caramel 5 is within the movement management area (step 5ll), that is, m-b<xn
It is determined whether the relationship <m+b holds true or not, and if the boxed caramel 5 is within the movement management area, the data is stored in the data memory DMs (RAM21) (step 512), and the number of non-defective products is counted. (step 513).

S is the remainder of n+no.

Then, until the number n of non-defective products becomes the second specific number n0,
This process is repeated, and a moving average value of the data sampled by this process is determined (step 514).

Note that in this embodiment, the second specific number no is 10, which is the same as the first specific number no, but the second specific number may be smaller than the first specific number. .

Then, in step Sll, when it is determined that the boxed caramel 5 is outside the movement management area, that is, the weight of the boxed caramel 5 is greater than the upper limit for filling the tube or smaller than the lower limit for management. In some cases, the defective product discharge device 8 operates in the same manner as described above, and the defective boxed caramel 5 is discharged to the outside (step 515). In this case, defective products are not counted.

In this way, after the inspection of a predetermined number of boxed caramels 5 is completed, the operation is stopped (step S16.517).
.

Note that if the test is to be restarted, the process returns to step S1 (step 518).

Although not shown in FIG. 6, a normal range is set further outside the initial control range C as shown by the two-dot chain line in FIG. If the value is on the outside, it may be determined that the device itself is in an abnormal state, and the system may be configured to notify that the device is in an abnormal state and to stop the entire device.

In addition, in this embodiment, the weight of the boxed caramel 5 is measured to detect and eliminate defective products, but the present invention can also be applied to other hygienic products such as confectionery, sanitary napkins, sanitary tampons, and pocket tissues. It goes without saying that this method can also be applied to inspecting missing items such as supplies and even industrial parts such as bolts and nuts.

Next, a second example will be described.

In this second embodiment, instead of detecting defective products by measuring the weight of the product, a sealing failure of a sealed container (specifically, a canned container) is detected by measuring the amount of deformation of the sealed container. Since the data processing is the same as in the first embodiment, only the structure of the device will be described.

7, 8, 9 and 10 show a second embodiment of the device, FIGS. 7 and 8 are sectional views of main parts of different embodiments, and FIG. 9 is the overall configuration of the device. A front view showing the first
Figure O is a plan view showing the overall configuration of the device.

In these figures, the packing can 1.01 is placed on a positioning table 107 fixed near the periphery of a circular rotary index table 106, and above it,
A flat cylindrical suction chamber 108 having an opening on the lower surface is provided so as to be movable up and down by an air cylinder 109.

A capacitive distance detection sensor 110 is fixed to the center inside the suction chamber 108 . Further, an air suction pipe 111 connected to a vacuum pump (not shown) is inserted and fixed into the suction chamber 108 for sucking the air in the suction chamber 108 to reduce the pressure.

112 is a case.

Then, the suction chamber 108 hangs down from the state shown in FIG. 8 and is pressed against the top surface of the can 101, and in this state, when the air inside the suction chamber 108 is sucked and the pressure is reduced,
The pressure in the space defined by the suction chamber 108 and the upper surface of the can 101 decreases. This generates stress that lifts the top surface of the can 101 upward.

At this time, if there is no large depression or sealing failure in the opening 101, the pressure inside the can lot is low, so the top surface of the can 101 will not be lifted up that much.

However, when a sealing failure occurs in the can 101, the pressure inside the can 101 becomes high, and in some cases becomes equal to atmospheric pressure, so that the top surface of the can 101 rises by 2.

Therefore, first, before the air in the suction chamber 108 is sucked, the can 1 is opened from the lower end of the distance detection sensor 110.
Measure the distance to the top surface of the can 101 and memorize the value, and then measure the distance from the bottom end of the distance detection sensor 110 to the top surface of the can 101 again after the air in the suction chamber 108 has been sufficiently sucked and depressurized. If you measure the value and take the difference between that value and the stored value, the difference will be the l
becomes.

If the value 2 of this difference is greater than or equal to a predetermined value, it is reported that the can 101 has a seal failure. That is, if a sealing failure occurs in the can 101, the pressure inside the can 101 increases as described above, and the value 2 of the difference increases accordingly, so that the value 1 exceeds a predetermined value. This means that a sealing failure has occurred in the can 101.

Furthermore, even if a large depression is formed in the can IO1, the internal volume of the can 101 decreases and the internal pressure increases in inverse proportion to this, which can cause the above-mentioned seal failure to occur. Similarly, the top surface of the can 101 will be raised by 2. Therefore, in this case as well, it will be detected in the same way as described above.

Although it is difficult to determine whether the can 101 has a poor seal or a large depression, it is not necessary to strictly distinguish between the two, since the product is defective in either case.

In this embodiment, the difference between the distance from the distance detection sensor 11O to the top surface of the can 101 when the pressure is reduced and the distance from the distance detection sensor 110 to the top surface of the can 101 when the pressure is not reduced is calculated, and the difference is determined by a predetermined value. If the difference is different from a predetermined value, it is reported that the can 101 has a seal failure or is deformed, so the top surface of the can 101 is uneven like a pull-top can. can be detected satisfactorily even if it is formed.

Next, the overall configuration of the apparatus will be outlined according to FIGS. 9 and 10.

Reference numeral 113 denotes a main body of the apparatus, and a drive section, a vacuum pump, etc. are housed inside the main body 113 of the apparatus. The device main body 11
The above-mentioned rotary index table 106 is mounted on the top surface of the 3. The rotary index table 10 is also placed on the L side of the rotary index table 106.
A cylinder holding table 114 having the same diameter as the cylinder 6 and rotating synchronously is provided.

The cylinder holding table 114 includes a positioning table 107 fixed to the rotary index table 106.
The air cylinders 109 are fixedly installed at positions corresponding to the piston rods 1 of these air cylinders 109.
The suction chamber 1O8 is fixedly installed at the tip of 15.

Rotary tables 116 and 117, called star wheels, are rotatably attached to the feeding and discharging portions of the can 101 of the rotary index table 106, respectively. 11
B and 119 are rotation axes of the rotary tables 116 and 117, respectively. A recess 116a into which one can can be inserted is provided at the peripheral edge of the rotary table 116 and 117, respectively;
117a is removed.

Further, a linear conveyor 102 extends from the supply section to the discharge section of the can 101, and on the J::fL side thereof,
The can 101 conveyed by the conveyor 102 is placed in each recess 116a of the rotary table 116, 117.
A pitch adjusting screw conveyor 120 is provided to match the pitch of pitch 117a.

121 is a control box.

The pitch of the cans 101 conveyed by the linear conveyor 102 is adjusted by the screw conveyor 120 and then supplied to the rotary table 116.

Then, the rotary table 116 rotates the rotary index table 106 by about 180 degrees [101]
is transferred onto the positioning table 107.

The can 101 is a rotary index table 1.
During the rotation of about 32 degrees along the rotational movement of 06, the presence or absence of a sealing failure is detected as described above.

The detected can 101 is supplied to the second rotary table 117, and finally placed on the downstream side of the linear conveyor 102, and further conveyed in the downstream direction. At this time, cans 101 that are determined to be defective due to poor sealing, etc. are moved to the linear conveyor 101 by air cylinders 122 for discharging defective products.
It is discharged to the outside (side) of 02.

Next, based on the block diagram shown in FIG. 11, some explanation will be given regarding the operation of detecting sealing failure and the like. In this figure, 1
23 is an MPU, and a ROM 125 and a RAM 126 are connected to the MPU 123 via a pass line 127, respectively. Further, the pass line 127 includes an I
10 distance detection sensor 1 via interface 124
Controlled devices such as 10 and cylinder 122 are connected to each other.

The ROM 125 stores a predetermined value corresponding to the difference value 2 of the non-defective product 101, and the RAM 126 stores a predetermined value corresponding to the difference value 2 of the non-defective product 101. Data on the distance to the top surface of the can 101 and data on the distance from the distance detection sensor 110 to the top surface of the can 101 when the pressure is not reduced are respectively stored temporally. Then, the MPU 123 calculates the difference between both data and stores the difference in the ROM.
125, and if the difference is larger than the predetermined value, this means that the can 101 has a sealing failure, etc., as described above, so the can 101 is excluded. A signal for discharging defective products is supplied to the air cylinder 122 for discharging defective products.

Note that the processing of the test result data is performed in the first step as described above.
In the same manner as in the embodiment, items located outside the initial management area and movement management area are excluded as defective products.

(G) Effects of the Invention In the present invention, since the control area is sequentially set using the moving reference value, it is possible to narrow the control area, and it is possible to prevent a defective product from being judged as a good product. Therefore, there is no possibility that defective products will be mixed into the product.

In addition, since the control area is set to a fixed maximum allowable width only from the start of work until a specific number of items are inspected, the number of defective judgments of non-defective products at the start of work is reduced even if the condition of the equipment changes. It is also possible to improve inspection efficiency.

Furthermore, if the normal range is set to a width wider than the maximum width of the control range and the weight or dimensions of the item are determined to be outside of the normal range, the device will notify you that it is in an abnormal state. If the apparatus is configured to stop the apparatus at the same time, it becomes possible to recognize conditions other than whether the article is good or defective, such as failure of the apparatus.

Furthermore, if the inspection results are fed back to the manufacturing equipment (for example, a filling machine), more accurate control becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a graph showing changes in the weight of the article in the first embodiment of the present invention, FIG. 2 is a graph showing changes in the weight of the article in the conventional example, and FIG. 3 is the graph showing the change in the weight of the article in the first embodiment of the present invention. A schematic front view of the device, FIG. 4 is a schematic block diagram thereof, and FIG. 5 is a schematic front view of the device.
6 is a flowchart, FIG. 7 is a cross-sectional view of a main part of a device according to a second embodiment of the present invention, and FIG. 8 is a cross-sectional view of a main part in a mode different from that in FIG. 7. Figure, No. 9
The figure is a front view of the overall configuration, Figure 10 is its plan view, and Figure 11 is a front view of the overall configuration.
The figure is a block diagram. DESCRIPTION OF SYMBOLS 1... Apparatus main body, 2...-Weight measuring section, 3... Weighing conveyor, 4... Load cell, 5... Boxed caramel (article), 6... Supply conveyor, 7... Sorting conveyor, 8... Defective product discharge device, 9.10... Photo sensor, 11... Metering control section, 12... Level adjuster, 13-... DC amplifier, 14... Filter,
15... A/D converter, 16... I10 interface, 17... Pass line, 18... MPU, 19
...Numeric keypad 20...Display device, 21...RA
M, 22...ROM, 23...Printer, 101.
・Can, 106... Rotary table, 107... Positioning table, 10th... Suction chamber, 109... Air cylinder, 110... Distance detection sensor, 111... Air suction pipe, 112 ...Case, 113...Device body, 114...Cylinder holding table, 115...
Piston rod, 116.117... rotary table,
118.119...Rotating shaft, 120...Screw conveyor, 121...Control box, 122...Air cylinder, 123...-MPU, 124-...I10
Interface, 125...ROM, 126...RAM. Patent applicant Futatsuka Densoku Co., Ltd. (1 other person) Figure #11

Claims (1)

[Claims] 1. Measure the weight of a plurality of articles individually to detect whether the weight of each article is within a predetermined control area, and determine whether the weight of each article is outside the control area. In a defective product detection method that determines a product to be relatively defective, from the start of a weight measurement operation until the weight of a first specific number of two or more products is measured, the control area is set to a fixed maximum allowable range. Significantly set, the first
After measuring the weight of the specified number of items, a new control area is sequentially set based on the average value of the weights of two or more specified number of items whose weight was measured immediately before and determined to be non-defective. A defective product detection method characterized by: 2. When the weight of the article is further outside a normal range set to a width wider than the maximum allowable width, it is determined that the article is in a state other than defective. Good product detection method. 3. The defective product detection method according to claim 1 or 2, wherein the second specific number is 3 or more and 20 or less. 4. The first specific number is the same as the second specific number or
The defective product detection method according to any one of claims 1 to 3, wherein the number is greater than the specific number. 5. A transport means for continuously or intermittently transporting multiple items, a weight measuring means for individually measuring the weight of the items transferred by the transport means, and whether the weight of each item is within a predetermined control range. A defective product detection/elimination system comprising a detection means for detecting whether or not the product is defective, a determination means for determining an article whose weight is outside the control area as defective, and an exclusion means for rejecting an article determined to be defective. In the apparatus, a counting means for counting a first specific number of two or more articles from the start of a weight measurement operation, and whether or not each of the first specific number of articles is in a fixed certain control area. 2, whose weight was measured immediately before and was determined to be non-defective.
and a movement management area setting means for setting a new management area based on the average value. Features a defective product detection and elimination device. 6. Abnormality detection that notifies the device that it is in an abnormal state and stops the device when the weight of the item is further outside the normal range, which is set to a width wider than the maximum allowable width. 6. The defective product detection and exclusion device according to claim 5, further comprising means. 7. The defective product detection and elimination device according to claim 6, wherein the weight of each product is measured on a weighing conveyor to which a load cell is connected. 8. The defective product detection and removal device according to claim 7, further comprising a supply conveyor for supplying the articles onto the weighing conveyor, provided upstream of the weighing conveyor along the transfer direction of the articles. 9. A sorting conveyor is provided on the downstream side of the weighing conveyor along the article transport direction to receive the weighed articles from the weighing conveyor, and the sorting conveyor is provided with defective product removal means for eliminating defective products. The defective product detection and exclusion device according to claim 7 or claim 8. 10. Measure the dimensions of a plurality of articles individually, detect whether the dimensions of each article are within a predetermined control range, and determine whether or not the dimensions of each article are outside the control range as relatively defective. In the defective product detection method, 2
Until the dimensions of a first specific number of articles greater than or equal to
After setting the control area to a fixed maximum allowable width and measuring the dimensions of the first specific number of items, measure the dimensions of the two or more second items whose dimensions were measured immediately before and determined to be non-defective. A defective product detection method characterized by sequentially setting new control areas based on the average value of dimensions of a specific number of products. 11. A transfer means that continuously or intermittently transfers multiple articles, a dimension measuring means that individually measures the dimensions of the articles transferred by the transfer means, and whether the dimensions of each article are within a predetermined control range. A defective product detection/elimination system comprising a detection means for detecting whether or not the product is defective, a determination means for determining an article whose dimensions are outside the control area as defective, and an exclusion means for rejecting an article determined to be defective. In the apparatus, a counting means for counting two or more first specific number of articles from the start of the dimension measurement operation, and whether each of the first specific number of articles is in a fixed certain control area or not. A detection means for detecting the 2.
and a movement management area setting means for setting a new management area based on the average value. Features a defective product detection and elimination device. 12. The method for detecting defective products according to claim 10 or claim 11, wherein the product is a sealed container, and defects are detected by measuring the deformation dimension that deforms when the sealed container is pressurized or depressurized from the outside. The defective product detection and elimination device described.