JP2008196978A - Weighing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an article supply device for supplying uniformly articles to each feed trough, and keeping the amount of articles on a distribution table within a fixed range, by controlling the opening of a gate to be variable. <P>SOLUTION: The article supply device 2 has the paired gates 3A, 3B for setting the openings thereof independently. Articles sliding along the gate 3A set at a gentle slope are struck with the opposed gate 3B set at a steep slope, to correct a sliding track of the articles, and the articles are thereby dropped toward the central part of the dispersion table 4. A combination weighing device is provided with measuring parts 9A, 9B for measuring weights of the articles on the distribution table 4, and a control part 11 for controlling respectively the openings of the gates 3A, 3B. The control part 11 controls the openings of the gates 3A, 3B to be variable, based on the weights of the articles on the distribution table 4 measured by the measuring parts 9A, 9B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a weighing device, and more particularly to an article supply device in a combination weighing device.

  A conventional combination weighing device including an article supply device for supplying articles to a dispersion table by opening and closing a gate is disclosed in, for example, Patent Document 1 below.

  FIG. 11 is a top view schematically showing a part of the structure of a conventional combination weighing device. A plurality (16 in this example) of feed troughs 601 to 616 are arranged along the outer periphery of the dispersion table 4 having the partition wall 5, and articles are placed on the dispersion table 4 above the dispersion table 4. An article supply device 102 for dropping into the container is disposed. The article supply apparatus 102 includes a pair of gates 103A and 103B that can be opened and closed independently.

  In addition, a cylindrical tube body in which articles are accumulated is disposed on a circular umbrella-shaped receiving plate, and by moving the cylinder up or down, the article from the lower end of the tube body to the receiving plate is placed. A dispersion supply apparatus that adjusts the supply amount is disclosed in Patent Document 2 below.

Japanese Utility Model Publication No.6-2118 JP 10-2112016 A

  FIG. 12 is a side view showing a state where the gate 103B shown in FIG. 10 is opened. When the gate 103B is opened, the articles accumulated in the article supply apparatus 102 slide on the slope of the closed gate 103A and then fall in a substantially parabolic shape. Therefore, as shown in FIG. 12, many articles 150 fall a little farther from the center of the dispersion table 4 when viewed from the gate 103A. Therefore, among the feed troughs 601 to 608 on the right half side shown in FIG. 10, the amount of articles supplied to the feed troughs 601 and 608 located at the end portion is smaller than the others, and the feed located at the center portion. The supply amount of the articles to the troughs 604 and 605 becomes larger than the others, and the supply amount of the articles to the feed troughs 601 to 608 varies. As a result, the combination weighing device as a whole has problems such as a decrease in measurement accuracy and a decrease in operating rate.

  The present invention has been made to solve such a problem, and can uniformly supply articles to each of a plurality of feed troughs, and variably controls the opening of the gate. Accordingly, an object of the present invention is to provide a weighing device including an article supply device that can keep the amount of articles on a dispersion table within a certain range.

  According to a first aspect of the present invention, there is provided a weighing apparatus comprising: a dispersion table in which a plurality of article input areas are defined by a partition member; a plurality of supply means disposed along an outer periphery of the dispersion table; Each of the weighing means, and a weighing device provided above the dispersion table and loading means for loading an article onto the dispersion table, wherein the loading means can set the opening degree independently. The article having a pair of first and second gates and having slid along the first gate set to a gentle slope is opposed to the second gate set to a steep slope. In this case, the article is dropped toward the center of the dispersion table by correcting the sliding track of the article, and the measuring device measures the weight of the article on the dispersion table. And a control means for controlling the opening of each of the first and second gates, the control means based on the weight of the article on the dispersion table measured by the measurement means, The opening degree of the second gate is variably controlled.

  The weighing device according to a second invention is the weighing device according to the first invention, in particular, the control means is based on a comparison result between the first threshold value and the weight of the article on the dispersion table. , Controlling whether to open the first and second gates, and comparing the second threshold value smaller than the first threshold value with the weight of the article on the dispersion table. If the weight of the article on the dispersion table is greater than or equal to the second threshold, the opening of the second gate is set to the first opening, and the article on the dispersion table is set. When the weight of the second gate is less than the second threshold, the opening of the second gate is set to a second opening larger than the first opening.

  The weighing device according to a third aspect of the invention is the weighing device according to the second aspect of the invention, particularly comprising storage means for storing control data that can be referred to by the control means. The threshold value and the second opening degree are described according to the type of the article.

  The weighing device according to a fourth invention is an elapsed time from the time when the weight of the article on the dispersion table becomes less than the second threshold, particularly in the weighing device according to the second or third invention. The control means further comprises a timing means for measuring the second gate when the weight of the article on the dispersion table is less than the second threshold for a predetermined time or longer. Is set to the second opening, and the state where the weight of the article on the dispersion table is less than the second threshold is resolved within the predetermined time, the first The opening of the second gate is set to the first opening.

  According to the weighing device according to the first to fourth inventions, the control means variably controls the opening degree of the second gate based on the weight of the article on the dispersion table measured by the measurement means. Therefore, when the weight of the article on the dispersion table is relatively large, the opening degree of the second gate is set to be small, and conversely, when the weight of the article on the dispersion table is relatively small, the second gate is set. By setting the opening degree of the gate large, the amount of articles on the dispersion table can be kept uniform.

  In particular, according to the weighing device according to the second invention, in addition to the first threshold value for controlling the opening of the gate, a second threshold value for adjusting the opening of the opened gate is provided, Based on the comparison result between the second threshold value and the weight of the article on the dispersion table, it is controlled whether the opening degree of the second gate is set to the first opening degree or the second opening degree. Therefore, the opening degree of the second gate can be easily and reliably controlled by a simple control of comparing the second threshold value and the weight value.

  Particularly, according to the weighing device according to the third invention, the control data stored in the storage means describes the second threshold value and the second opening according to the type of the article. . Therefore, referring to the control data by the control means, it is possible to appropriately set the second opening according to the type of article currently being weighed.

  In particular, according to the weighing device according to the fourth aspect of the present invention, when the state in which the weight of the article on the dispersion table is less than the second threshold is resolved within a predetermined time, the control means The gate opening is set to the first opening, not the second opening. Therefore, even when the weight value of the article on the dispersion table fluctuates in the vicinity of the second threshold value, the second gate remains at the first opening, and the second gate is opened. It is possible to avoid a situation in which the degree is frequently changed to the first or second opening.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the element which attached | subjected the same code | symbol in different drawing shall show the same or corresponding element.

  FIG. 1 is a side view schematically showing an overall configuration of a combination weighing device according to an embodiment of the present invention. An article supply device 2 is disposed below the feeder 1, and a dispersion table 4 is disposed below the article supply device 2. A plurality of feed troughs 6 (reference numerals 605 and 613 in FIG. 1) are arranged along the outer periphery of the dispersion table 4, and weighing means 7 having a pool hopper, a weighing hopper, and the like below each feed trough 6. In FIG. 1, reference numerals 705 and 713) are provided. Collective chutes 8A and 8B are disposed below the weighing means 7. Here, the feed trough 6 functions as supply means for supplying articles to the weighing means 7. In addition, the article supply device 2 functions as an input unit for dropping an article into the distribution table 4.

  FIG. 2 is a top view showing an arrangement configuration of a plurality of feed troughs 6 (reference numerals 601 to 616 in FIG. 2) in the combination weighing device having a 16-head circular arrangement. As shown in FIG. 2, in the combination weighing device with a 16-head circular arrangement, 16 feed troughs 601 to 616 are arranged radially.

  FIG. 3 is a top view showing the dispersion table 4 superimposed on FIG. A partition wall 5 is formed at the center of the upper surface of the dispersion table 4. The partition wall 5 partitions the upper surface area of the distribution table 4 into an article input area 4A on the left side of the paper and an article input area 4B on the right side of the paper. The 16 feed troughs 601 to 616 are classified into eight feed troughs 601 to 608 corresponding to the article input area 4B and eight feed troughs 609 to 616 corresponding to the article input area 4A.

  FIG. 4 is a top view showing the article supply apparatus 2 superimposed on FIG. A cross-sectional view regarding a position along line II in FIG. 4 corresponds to FIG. 1 and 4, the article supply apparatus 2 has a gate 3A corresponding to the left half of the dispersion table 4 and a gate 3B corresponding to the right half. The pair of gates 3A and 3B can be opened and closed independently of each other. Articles are thrown into the article throwing area 4A by the gate 3A, and articles are thrown into the article throwing area 4B by the gate 3B.

  FIG. 5 is a side view showing a situation in which an article is thrown into the article throwing area 4B. With the axis H2 as the center, the gate 3B rotates counterclockwise from the state shown in FIG. 1, and the inclination angle of the gate 3B is tighter than the inclination angle of the gate 3A. That is, the gate 3A becomes a gentle slope and the gate 3B becomes a steep slope. Then, as indicated by arrows V1 and V2 in FIG. 5, the article 50 accumulated in the article supply device 2 is slid along the gate 3A on the gentle slope side, and on the opposite steep slope side. It falls in a parabolic shape toward the gate 3B, and then the sliding track is corrected inward by hitting the gate 3B. And it is made to fall in a parabolic shape toward the center part of the dispersion | distribution table 4 with the momentum which slid along the gate 3B. As a result, as shown in FIG. 5, the articles 50 are stacked in a mountain shape at the center of the dispersion table 4.

  FIG. 6 is a side view showing a situation in which an article is thrown into the article throwing area 4A. With the axis H1 as the center, the gate 3A rotates clockwise from the state of FIG. 1 and maintains its posture, whereby the inclination angle of the gate 3A is tighter than the inclination angle of the gate 3B. That is, the gate 3A becomes a steep slope and the gate 3B becomes a gentle slope. Then, as indicated by arrows V3 and V4 in FIG. 6, the article 50 accumulated in the article supply apparatus 2 is slid along the gate 3B on the gentle slope side, and on the opposite steep slope side. It falls in a parabolic shape toward the gate 3A, and then the sliding track is corrected inward by hitting the gate 3A. And it is made to fall in the shape of a parabola toward the center part of the dispersion | distribution table 4 with the momentum which slid along the gate 3A. As a result, as shown in FIG. 6, the articles 51 are piled up at the center of the dispersion table 4.

  In the weighing device according to the present embodiment, the opening of the gate 3B (the opening area of the article insertion opening given as the product of the dimension W shown in FIG. 4 and the dimension L1 shown in FIG. 5) and the opening of the gate 3A. The degree (the opening area of the article insertion opening given as the product of the dimension W shown in FIG. 4 and the dimension L2 shown in FIG. 6) can be set independently of each other. Here, since the dimension W is a fixed value, in the present embodiment, the opening degree of the gate 3A is set by the dimension L3B shown in FIG. 5, and the opening degree of the gate 3B is set by the dimension L3A shown in FIG. Is set.

  FIG. 7 is a block diagram showing a configuration of a control device for controlling the opening degree of the gates 3A and 3B. As shown in FIG. 7, the control device measures the total weight of the articles placed on the article input area 4 </ b> A and the measuring unit 9 </ b> A that measures the total weight of the articles placed on the article input area 4 </ b> A. A measuring unit 9B for measuring, a storage unit 13 storing threshold values S1 to S3 and dimensions P1 and P2, a driving unit 12A for driving the gate 3A, a driving unit 12B for driving the gate 3B, and the entire apparatus And a control unit 11 that performs control.

  FIG. 8 is a flowchart showing the flow of processing in the control device shown in FIG. Hereinafter, a method for setting the opening degree of the gate 3B will be described with reference to FIGS.

  First, in step SP01, the measuring unit 9B measures the total weight of the articles placed on the article input area 4B. Data T related to the result of measurement by the measurement unit 9B is input to the control unit 11.

  Next, in step SP02, the control unit 11 compares the data T input from the measurement unit 9B with the threshold value S1 read from the storage unit 13. The threshold value S1 is a boundary weight value for determining whether or not to start the supply of articles from the article supply device 2 to the distribution table 4, and is an optimum value of the threshold value S1 for each type of article to be weighed. Is obtained in advance and stored in the storage unit 13 as one of the control data. By inputting the type of article currently being weighed, the threshold value S1 corresponding to the type is automatically read from the storage unit 13 to the control unit 11. As an example, a weight value that is 20% lower than the target total weight of articles on the article input area 4B is set as the threshold value S1.

  When the weight value represented by the data T is equal to or greater than the threshold value S1 (that is, when the determination result in step SP02 is “NO”), the process returns to step SP01, and the gates 3A and 3B are not opened. The measurement of the weight of the article by the measurement unit 9B is performed again.

  On the other hand, if the weight value represented by the data T is less than the threshold value S1 (that is, if the result of determination in step SP02 is “YES”), then in step SP03, the control unit 11 The data T input from 9B is compared with the threshold value S2 read from the storage unit 13. The threshold value S2 is a boundary weight value that determines whether the opening degree of the gate 3B is set to be small or large, and an optimum value of the threshold value S2 is obtained in advance for each type of article to be weighed. Are stored in the storage unit 13 as one of the control data. Similarly to the above, by inputting the type of the article currently being weighed, the threshold value S2 corresponding to the type is automatically read from the storage unit 13 to the control unit 11. As an example, a weight value that is 50% lower than the target total weight of the articles on the article input area 4B is set as the threshold value S2.

  If the weight value represented by the data T is greater than or equal to the threshold value S2 (that is, if the result of determination in step SP03 is “NO”), then in step SP07, the control unit 11 opens the gate 3B. Decrease the degree. For example, the dimension L3B shown in FIG. 5 is set to the dimension P1 read from the storage unit 13. As the value of the dimension P1, an optimum value is obtained in advance for each type of article to be weighed, and is stored in the storage unit 13 as one of the control data. Similarly to the above, by inputting the type of the article currently being weighed, the dimension P1 corresponding to the type is automatically read from the storage unit 13 to the control unit 11. As an example, when the diameter of the article is 50 to 60 mm, a value of 80 mm is set as the dimension P1.

  The drive unit 12B drives the gate 3B so that the set dimension P1 is realized. The drive unit 12A drives the gate 3A by a predetermined amount so that the gate 3A has a gentle slope. Thereby, the input of the article from the article supply apparatus 2 to the article input area 4B is started.

  On the other hand, if the weight value represented by the data T is less than the threshold value S2 (that is, if the result of determination in step SP03 is “YES”), then in step SP04, the control unit 11 causes the gate 3B. Increase the opening of. For example, the dimension L3B illustrated in FIG. 5 is set to the dimension P2 read from the storage unit 13. The dimension P2 is larger than the dimension P1, and the value of the dimension P2 is determined in advance for each type of article to be weighed and stored in the storage unit 13 as one of the control data. Similarly to the above, by inputting the type of the article currently being weighed, the dimension P2 corresponding to the type is automatically read from the storage unit 13 to the control unit 11. As an example, when the diameter of the article is 50 to 60 mm, a value of 120 mm (1.5 times the dimension P1) is set as the dimension P2.

  The drive unit 12B drives the gate 3B so that the set dimension P2 is realized. The drive unit 12A drives the gate 3A by a predetermined amount so that the gate 3A has a gentle slope. Thereby, the input of the article from the article supply apparatus 2 to the article input area 4B is started.

  Subsequent to step SP04, in step SP05, the measuring unit 9B measures the total weight of the articles placed on the article input area 4B. Data T related to the result of measurement by the measurement unit 9B is input to the control unit 11.

  Next, in step SP06, the control unit 11 compares the data T input from the measurement unit 9B with the threshold value S2 read from the storage unit 13.

  When the weight value represented by the data T is less than the threshold value S2 (that is, when the determination result in step SP06 is “YES”), the process returns to step SP05, and the opening degree of the gate 3B is kept large. The supply of the article from the article supply device 2 to the article input area 4B is continued, and the measurement of the weight of the article by the measurement unit 9B is performed again.

  On the other hand, when the weight value represented by the data T is equal to or greater than the threshold value S2 (that is, when the result of determination in step SP06 is “NO”), in step SP07, the control unit 11 next determines the gate 3B. Set the opening of to small. For example, the dimension L3B shown in FIG. 5 is set to the dimension P1 read from the storage unit 13.

  Subsequent to step SP07, in step SP08, the measurement unit 9B measures the total weight of the articles placed on the article input area 4B. Data T related to the result of measurement by the measurement unit 9B is input to the control unit 11.

  Next, in step SP09, the control unit 11 compares the data T input from the measurement unit 9B with the threshold value S3 read from the storage unit 13. The threshold value S3 is a weight value at the boundary for determining whether or not to stop the supply of articles from the article supply device 2 to the distribution table 4, and the optimum value of the threshold value S3 for each type of article to be weighed. Is obtained in advance and stored in the storage unit 13 as one of the control data. Similarly to the above, by inputting the type of the article currently being weighed, the threshold value S3 corresponding to the type is automatically read from the storage unit 13 to the control unit 11. As an example, a weight value that is 20% higher than the target total weight of articles on the article input area 4B is set as the threshold value S3.

  When the weight value represented by the data T is less than the threshold value S3 (that is, when the determination result in step SP09 is “NO”), the process returns to step SP08, and the gates 3A and 3B are not closed. The supply of the article from the article supply device 2 to the article input area 4B is continued, and the measurement of the weight of the article by the measurement unit 9B is performed again.

  On the other hand, if the weight value represented by the data T is equal to or greater than the threshold value S3 (that is, if the result of determination in step SP09 is “YES”), then in step SP10, the control unit 11 controls the gate 3A. , 3B are output, and the drive units 12A, 12B receiving the control signals close the gates 3A, 3B.

  Thereafter, the process returns to step SP01, and the above processing is repeatedly executed.

  In the above description, in order to control the opening degree of the gate 3B, the dimension L3B of the gate 3B is variably controlled in two stages of the dimension P1 and the dimension P2, but variable control in three or more stages may be performed. .

  As an additional function, for example, the inclination angle of the gate 3A on the gentle slope side can be adjusted according to the viscosity of the article. By setting the inclination angle of the gate 3A tightly in the case of an article having a high viscosity, and setting it gently in the case of an article having a low viscosity, the input amount of the article from the article supply device 2 to the article input area 4B is obtained. It can be made uniform regardless of the viscosity of the article. For example, the optimum amount of rotation related to the gate 3A on the gentle slope side is obtained for each type of articles having different viscosities and registered in the storage unit 13 in advance, and the type of article currently being measured is input. The rotation amount corresponding to the type can be automatically read from the storage unit 13 to the control unit 11, and the gate 3A on the gentle slope side can be set to the rotation amount.

  Further, in the above description, the setting of the opening degree of the gate 3B when the article is input into the article input area 4B has been described. However, the setting of the opening degree of the gate 3A when the article is input into the article input area 4A is also basic. Since it is the same as above, description is abbreviate | omitted.

  Thus, according to the article supply device 2 included in the combination weighing device according to the present embodiment, for example, as shown in FIG. 5, the article 50 that has slid along the gate 3A on the gentle slope side faces each other. The sliding track is corrected by hitting the gate 3B on the steep slope side and dropped toward the center of the dispersion table 4. Accordingly, the article 50 can be uniformly supplied to each of the plurality of feed troughs 6 arranged along the outer periphery of the dispersion table 4, and the article 50 can be supplied to each of the plurality of weighing means 7. Uniform supply is possible. As a result, as a whole combination weighing device, it is possible to improve the measurement accuracy and the operation rate.

  Moreover, as shown in FIGS. 5 to 8, the control unit 11 variably controls the opening degrees of the gates 3 </ b> A and 3 </ b> B based on the weight of the article on the dispersion table 4 measured by the measurement units 9 </ b> A and 9 </ b> B. . Accordingly, when the weight of the article on the dispersion table 4 is relatively large, the opening degree of the gates 3A and 3B is set to be small, and conversely, when the weight of the article on the dispersion table 4 is relatively small, the gate The opening degree of 3A and 3B can be set large. As a result, the amount of articles on the dispersion table 4 can be kept uniform.

Modified example.
FIG. 9 is a block diagram showing a modification of the control device shown in FIG. In addition to the configuration shown in FIG. 7, a timer unit 14 that measures the passage of time is provided.

  FIG. 10 is a flowchart showing the flow of processing in the control device shown in FIG. Hereinafter, a method for setting the opening of the gate 3A will be described with reference to FIGS.

  The operations in steps SP01 to SP03 are the same as those in FIG. Further, the operation in the case where the determination result in step SP03 is “NO” is the same as FIG.

  In step SP03, when the weight value represented by the data T is less than the threshold value S2 (that is, when the result of determination in step SP03 is “YES”), in step SP11, the timer unit 14 The elapsed time from when the weight value represented by the data T becomes less than the threshold value S2 is measured. The result of measurement by the timer unit 14 is input to the control unit 11 as data M.

  Next, in step SP12, the control unit 11 compares the data M input from the time measuring unit 14 with the threshold value N read from the storage unit 13. The threshold value N is a boundary time value that determines whether the opening degree of the gate 3B is set to be small or large, and an optimum value of the threshold value N is obtained in advance for each type of article to be weighed. Are stored in the storage unit 13 as one of the control data. Similarly to the above, by inputting the type of the article currently being weighed, the threshold value N corresponding to the type is automatically read from the storage unit 13 to the control unit 11. As an example, a time of “5 seconds” is set as the threshold value N.

  If the time value represented by the data M is less than the threshold value N (that is, if the result of determination in step SP12 is “NO”), then in step SP07, the control unit 11 opens the gate 3B. Decrease the degree. Such a situation is a situation in which the state in which the weight of the article on the article input area 4B is less than the threshold value S2 is eliminated within a predetermined time given by the threshold value N. In this case, the control unit 11 sets the opening degree of the gate 3B small.

  On the other hand, when the time value represented by the data M is greater than or equal to the threshold value N (that is, when the result of determination in step SP12 is “YES”), in step SP04, the control unit 11 next determines the gate 3B. Increase the opening of. Such a situation is a situation in which the state in which the weight of the article on the article input area 4B is less than the threshold value S2 has continued for a predetermined time or more given by the threshold value N. In this case, the control unit 11 Sets a large opening of the gate 3B.

  The operations after step SP04 are the same as those in FIG.

  According to the combination weighing device according to this modification, the control unit 11 opens the gate 3B when the weight of the article on the distribution table 4 is less than the threshold value S2 within a predetermined time. The degree is set to dimension P1, not dimension P2. Therefore, even when the weight value of the article on the dispersion table 4 fluctuates in the vicinity of the threshold value S2, the gates 3A and 3B keep the opening of the dimension P1, and the opening of the gates 3A and 3B. Can be avoided from being frequently changed to the dimension P1 or the dimension P2.

  Moreover, when the opening degree of the gates 3A and 3B is set to the dimension P1, the effect of collecting articles at the center of the dispersion table 4 is higher than when the opening is set to the dimension P2. For this reason, even if the weight value of the article on the dispersion table 4 fluctuates finely near the threshold value S2, the article is placed in the center of the dispersion table 4 by keeping the opening degree of the gates 3A and 3B at the dimension P1. Can be collected.

1 is a side view schematically showing the overall configuration of a combination weighing device according to an embodiment of the present invention. It is a top view which shows the arrangement configuration of a plurality of feed troughs. FIG. 3 is a top view showing the dispersion table superimposed on FIG. 2. FIG. 4 is a top view of the article supply device shown in FIG. It is a side view which shows the condition which throws goods into the right half of a dispersion | distribution table. It is a side view which shows the condition which throws goods into the left half of a dispersion | distribution table. It is a block diagram which shows the structure of the control apparatus for controlling the opening degree of a gate. It is a flowchart which shows the flow of a process in the control apparatus shown in FIG. It is a block diagram which shows the modification of the control apparatus shown in FIG. It is a flowchart which shows the flow of a process in the control apparatus shown in FIG. It is a top view which shows typically a part of structure of the conventional combination weighing | measuring device. FIG. 12 is a side view showing a state where the gate shown in FIG. 11 is opened.

Explanation of symbols

2 Article supply device 3A, 3B Gate 4 Dispersion table 4A, 4B Article input area 6 (601-616) Feed trough 7 Weighing means 9A, 9B Measuring section 11 Control section 12A, 12B Drive section 13 Storage section 14 Timing section 50, 51 Article

Claims (4)

A dispersion table in which a plurality of article input areas are defined by a partition member; a plurality of supply means disposed along an outer periphery of the dispersion table; and weighing means disposed respectively below the supply means; In a weighing device provided above the dispersion table and provided with a loading means for loading articles onto the dispersion table,
The charging means has a pair of first and second gates whose opening degree can be set independently,
The article that has been slid along the first gate set to a gentle slope hits the second gate that is set to a steep slope, and the sliding path of the article is corrected, whereby the article is corrected. Is dropped toward the center of the dispersion table,
The weighing device is
Measuring means for measuring the weight of the article on the dispersion table;
Control means for controlling the opening of each of the first and second gates,
The control unit is a weighing device that variably controls the opening degree of the second gate based on the weight of the article on the dispersion table measured by the measurement unit. The control means includes
Controlling whether to open the first and second gates based on a comparison result between the first threshold and the weight of the article on the dispersion table;
Based on the comparison result between the second threshold value that is smaller than the first threshold value and the weight of the article on the dispersion table, the weight of the article on the dispersion table is the second weight. If it is greater than or equal to the threshold, the opening of the second gate is set to the first opening, and if the weight of the article on the dispersion table is less than the second threshold, the second The measuring device according to claim 1, wherein the opening of the gate is set to a second opening larger than the first opening. A storage unit storing control data that can be referred to by the control unit;
The weighing device according to claim 2, wherein the control data includes the second threshold value and the second opening degree according to a type of the article. Further comprising time measuring means for measuring an elapsed time from the time when the weight of the article on the dispersion table becomes less than the second threshold,
The control means includes
When the state where the weight of the article on the dispersion table is less than the second threshold continues for a predetermined time or more, the opening of the second gate is set to the second opening,
When the state in which the weight of the article on the dispersion table is less than the second threshold is resolved within the predetermined time, the opening of the second gate is set to the first opening. The weighing device according to claim 2, wherein the weighing device is set.

Images