JP5280881B2 - Combination weighing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination weighing device capable of improving an operation rate by changing an allowable upper limit weight value corresponding to the state of weighing. <P>SOLUTION: This combination weighing device 1 includes a plurality of weighing hoppers 8 for storing articles 100, weighing means 11 for weighing the weight of the articles 100 stored in each weighing hopper 8, a selection part 41 for selecting combination of weighing hoppers 8 for acquiring a total weight value W over a target weight value M0 and below the allowable upper limit weight value M from among the plurality of weighing hoppers 8 based on each weighing result by a plurality of weighing means 11, and a setting part 43 for setting variably the allowable upper limit weight value M based on a mean value A of a plurality of total weight values W acquired by a plurality of times of latest weighing. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a combination weighing device.

  Generally, in a combination weighing device, a target weight value and an allowable upper limit value (allowable upper limit weight value) are set in advance. Then, among the plurality of weighing hoppers storing articles, a combination of weighing hoppers whose total weight value falls within the allowable range (that is, the target weight value and below the allowable upper limit value) is selected, and the selected weighing hopper Goods are discharged together. Here, the allowable upper limit value is uniquely set as a fixed value.

  Patent Document 1 listed below discloses a combination weighing device that changes the upper limit number of weighing hoppers that can participate in a combination according to a predetermined fraction rate or defective rate.

Japanese Patent No. 2925276

  When there are a large number of empty weighing hoppers due to a delay in the supply of articles to each weighing hopper, a situation may occur in which a combination of weighing hoppers that realize an appropriate total weight value is not realized. In particular, when an article with a relatively large weight (for example, chicken thigh) is to be weighed, there is a high possibility that the combination will not be established due to the presence of an empty weighing hopper. In this case, since it is necessary to wait for an article to be supplied to an empty weighing hopper, the operating rate of the apparatus decreases.

  The present invention has been made in view of such circumstances, and an object thereof is to obtain a combination weighing device capable of improving the operating rate by changing the allowable upper limit value according to the measurement situation. is there.

The combination weighing device according to the first aspect of the present invention includes a plurality of hoppers that store articles, a weighing unit that measures the weight of articles stored in each hopper, and a weighing result of the plurality of weighing units. Based on the selection means for selecting a hopper combination that obtains a total weight value that is greater than or equal to the target weight value and less than or equal to the allowable upper limit value among the plurality of hoppers, and a correspondence relationship between the plurality of average values and the plurality of allowable upper limit values The allowable upper limit value is made variable by specifying, from the data table, an allowable upper limit value corresponding to an average value of the plurality of the total weight values obtained by the latest multiple times of measurement based on the data table. and a setting means for setting, in said data table, according to the mean value are allowable upper limit of at least three stages is set, the setting means, when increasing the allowable upper limit value, the current settings It is characterized in that the change from the allowable upper limit is the allowable upper limit of one stage.

  According to the combination weighing device according to the first aspect, the setting means variably sets the allowable upper limit value based on the average value of the plurality of total weight values obtained by the latest plurality of measurements. Therefore, when the average value is close to the allowable upper limit value, the allowable range is widened by increasing the allowable upper limit value, so that the possibility of obtaining a total weight value within the allowable range in the subsequent weighing increases. As a result, the operating rate of the apparatus can be improved.

Moreover, according to the combination weighing device according to the first aspect, the setting unit changes the allowable upper limit value into a plurality of stages according to the average value. Therefore, the allowable upper limit value once increased can be further increased in accordance with the average value, thereby further expanding the allowable range. As a result, the operating rate of the apparatus can be improved.

In the combination weighing device according to the second aspect of the present invention, in particular, in the combination weighing device according to the first aspect, the setting means includes at least an allowable upper limit value of the first stage and an allowable upper limit value of the first stage. Higher allowable upper limit value of the second stage and higher allowable upper limit value of the third stage higher than the allowable upper limit value of the second stage can be set, and the setting means can set the allowable upper limit value of the third stage. In the case of lowering the allowable upper limit value of the first stage from the allowable upper limit value of the third stage to the allowable upper limit value of the second stage, the allowable upper limit value of the second stage is changed to the first upper limit value. The allowable upper limit value is changed.

According to the combination weighing device according to the second aspect, when the setting means lowers the allowable upper limit value in the third stage to the allowable upper limit value in the first stage, the setting upper limit value in the third stage is set in the second stage. After changing to the allowable upper limit value, the second stage allowable upper limit value is changed to the first stage allowable upper limit value. In this way, when lowering the allowable upper limit value, it is possible to avoid a situation in which the operating rate rapidly decreases due to the lowering of the allowable upper limit value by gradually lowering the value instead of rapidly decreasing it. It becomes possible.

The combination weighing device according to a third aspect of the present invention is the combination weighing device according to the first aspect, in particular, the setting means includes at least an allowable upper limit value of the first stage and an allowable upper limit value of the first stage. Higher allowable upper limit value of the second stage and higher allowable upper limit value of the third stage higher than the allowable upper limit value of the second stage can be set, and the setting means can set the allowable upper limit value of the third stage. When the value is lowered to the allowable upper limit value of the first stage, the allowable upper limit value of the third stage is changed to the allowable upper limit value of the first stage.

According to the combination weighing device according to the third aspect, when the setting unit lowers the allowable upper limit value of the third stage to the allowable upper limit value of the first stage, the setting means directly sets the allowable upper limit value of the third stage ( That is, it is changed to the allowable upper limit value of the first stage (without temporarily changing to the allowable upper limit value of the second stage). Thereby, since the total weight value close to the target weight value can be obtained at an early stage, it becomes possible to quickly restore the weighing accuracy that has been lowered due to the increase in the allowable upper limit value.

The combination weighing device according to a fourth aspect of the present invention is the combination weighing device according to the first aspect, in particular, the setting means includes at least a first-stage allowable upper limit value and a first-stage allowable upper limit value. Higher allowable upper limit value of the second stage, allowable upper limit value of the third stage higher than the allowable upper limit value of the second stage, and allowable upper limit value of the fourth stage higher than the allowable upper limit value of the third stage. When the setting means lowers the allowable upper limit value of the fourth step to the allowable upper limit value of the first step, the setting means sets the allowable upper limit value of the fourth step to the allowable value of the third step. After the change to the upper limit value, the allowable upper limit value of the third stage is changed to the allowable upper limit value of the first stage.

According to the combination weighing device according to the fourth aspect, when the setting means lowers the allowable upper limit value in the fourth stage to the allowable upper limit value in the first stage, the setting upper limit value in the fourth stage is set in the third stage. After changing to the allowable upper limit value, the third stage allowable upper limit value is changed to the first stage allowable upper limit value. In this way, instead of directly lowering the allowable upper limit value of the fourth stage to the allowable upper limit value of the first stage, the allowable upper limit value is lowered by temporarily setting the allowable upper limit value of the third stage. It is possible to avoid a situation in which the operating rate rapidly decreases due to this. Moreover, since the total weight value close to the target weight value can be obtained at an early stage by directly changing the allowable upper limit value of the third stage to the allowable upper limit value of the first stage, the allowable upper limit value is increased. It is possible to quickly recover the measurement accuracy that is reduced due to this.

  According to the present invention, it is possible to improve the operating rate of the combination weighing device by changing the allowable upper limit value according to the measurement situation.

It is a top view which shows a combination weighing device typically. It is a top view which shows a combination weighing device typically. It is a side view which shows typically the whole structure of a combination weighing device. It is a top view which shows the structure of one conveyance means. It is a front view which shows the structure of one conveyance means. It is a block diagram which shows a part of functional structure of a control part. It is a figure which shows an example of a data table. It is a figure which shows the some total weight value obtained in order. It is a figure which shows the relationship between an allowable overdose error and an allowable upper limit weight value. It is a figure which shows the example of a process in the case of reducing an allowable upper limit weight value.

  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.

  1 and 2 are top views schematically showing the combination weighing device 1 according to the embodiment of the present invention. 2, illustration of the distribution table 2 is omitted from FIG. FIG. 3 is a side view schematically showing the overall configuration of the combination weighing device 1.

  As shown in FIGS. 1 and 2, the combination weighing device 1 includes a dispersion table 2 and a plurality of heads H arranged in a circle around the dispersion table 2. In the present embodiment, an example in which the combination weighing device 1 includes twelve heads H1 to H12 will be described. However, the number of the heads H is not limited to this, and may be any plural number.

  As shown in FIG. 3, each head H includes a transport unit 3, a pool hopper 7, and a weighing hopper 8. The inner end portion of the conveying means 3 is located below the outer peripheral edge of the dispersion table 2. The pool hopper 7 is located below the outer end portion of the transport means 3. The weighing hopper 8 is located below the pool hopper 7. A weighing unit 11 such as a load cell is connected to the weighing hopper 8, and the weight of the article 100 stored in the weighing hopper 8 is measured by the weighing unit 11. Similarly, a weighing means 10 such as a load cell is connected to the pool hopper 7, and the weight of the article 100 stored in the pool hopper 7 is weighed by the weighing means 10. Arranged above the dispersion table 2 is an arbitrary loading device 15 (for example, a belt conveyor) for dropping and loading the article 100 onto the dispersion table 2.

  4 and 5 are a top view and a front view, respectively, showing the structure of one transport means 3. In FIG. 5, the conveying means 3 is viewed from the outer end side of the trough 4 toward the inner end side. The remaining transport means 3 not shown in FIGS. 4 and 5 has the same structure as that in FIGS. As shown in FIGS. 4 and 5, the conveying means 3 includes a trough 4 and a plurality of (two in the example of FIGS. 4 and 5) spiral members 5A and 5B. The spiral members 5A and 5B are arranged in a positional relationship that divides the 360 degree dispersion period into two equal parts (including almost equal parts, and so on). That is, as shown in FIG. 5, the spiral members 5A and 5B have the circumference R virtually defined at the outer end portion of the trough 4 (that is, as the rotation locus of the outer ends 25A and 25B of the spiral members 5A and 5B). Is arranged in a positional relationship that bisects the outer ends 25A and 25B of the spiral members 5A and 5B. 1 to 3, the spiral member 5A is indicated by a solid line and the spiral member 5B is indicated by a broken line in order to clarify the distinction between the spiral member 5A and the spiral member 5B. In the example shown in FIG. 5, the two spiral members 5 </ b> A and 5 </ b> B are arranged corresponding to one trough 4, but the present invention is not limited to this example, and one or three for each trough 4. One or more spiral members may be arranged.

  The spiral members 5 </ b> A and 5 </ b> B are rotatably disposed on the bottom surface of the trough 4. The inner ends of the spiral members 5A and 5B are fixed to the rotary shaft 6. When the rotary shaft 6 is rotationally driven by a motor (not shown), the spiral members 5A and 5B are rotationally driven in a direction of pushing the article 100 in the trough 4 from the inner end portion of the trough 4 toward the outer end portion. As described above, the spiral members 5A and 5B are arranged in a positional relationship that bisects the 360 degree dispersion period. Therefore, referring to FIG. 5, the outer end 25 </ b> B is positioned at the lowest point of the trough 4 by rotating the rotary shaft 6 180 degrees from the state where the outer end 25 </ b> A is positioned at the lowest point of the trough 4. It becomes.

  The trough 4 has a shape in which substantially the upper half of the cylinder is cut off. Accordingly, the trough 4 has a bottom surface defined as the inner surface of the cylinder and an open top surface. Further, the outer peripheral edge of the dispersion table 2 is positioned almost directly above the conveying means 3 so that the article 100 discharged from the outer peripheral edge of the dispersing table 2 is received by the conveying means 3 with almost no drop. Passed.

  Further, as shown in FIG. 3, the trough 4 is inclined and arranged in a forward leaning posture so that the outer end portion is positioned below the inner end portion. As a result, the bottom surface of the trough 4 is defined as a downward slope from the inner end portion toward the outer end portion. The spiral members 5A and 5B preferably have a circular cross-sectional shape. Thereby, compared with the spiral member which has a rectangular cross-sectional shape, while being able to improve cleaning property, the damage of the articles | goods 100 can be avoided or suppressed.

  Referring to FIGS. 1 and 3, the dispersion table 2 has a hollow eccentric cone shape in which the position of the apex is eccentric from the center of the bottom of the opening. A top cover 30 is attached to the position of the apex of the eccentric cone. The dispersion table 2 is rotatable about the center of the opening bottom of the eccentric cone as a rotation axis. In addition, the shape of the dispersion | distribution table 2 is not restricted to said example, For example, a cone-shaped dispersion | distribution table may be sufficient.

  FIG. 6 is a block diagram illustrating a part of the functional configuration of the control unit 20. As illustrated in FIG. 6, the control unit 20 includes a selection unit 41, storage units 42 and 44, and a setting unit 43.

  Hereinafter, the operation of the combination weighing device 1 according to the present embodiment will be described. In the following example, it is assumed that the target weight value M0 (that is, the allowable lower limit weight value) of the article 100 is set to 2000 g, and the initial value of the allowable overdose error G (allowable overdose error G1) is set to +10 g. Since the allowable upper limit weight value M is obtained as a value obtained by adding the allowable overdose error G1 to the target weight value M0, in the case of the initial setting, the allowable range as a positive amount product is equal to or greater than the target weight value M0 (2000 g). It becomes below upper limit weight value M1 (2010 g).

  The article 100 to be weighed (for example, food such as raw meat) is dropped from the loading device 15 into the center of the upper surface of the dispersion table 2. The article 100 put on the dispersion table 2 slides down the slope of the dispersion table 2, is discharged from the outer peripheral edge of the dispersion table 2, and is supplied to the inner end portion of the transport means 3. By positioning the position (stop position) of the dispersion table 2 before putting the article 100 from the feeding device 15, the article 100 can be supplied from the dispersion table 2 toward the transport means 3 of the desired head H.

  In each conveying means 3, the spiral members 5A and 5B are hollow because the core is not disposed in the internal space of the spiral members 5A and 5B. Accordingly, the article 100 supplied from the dispersion table 2 to the inner end portion of the conveying means 3 falls on the bottom surface of the trough 4 through the gap between the spiral members 5A and 5B, and is then rotated by the spiral members 5A and 5B that are rotationally driven. The bottom slope of the trough 4 is conveyed from the inner end portion toward the outer end portion by sliding down the down slope while being pushed from behind. The article 100 that does not fall from the gap between the spiral members 5A and 5B is conveyed on the spiral members 5A and 5B.

  Since articles such as raw meat are soft and absorb vibrations, it is difficult to convey them by means of a conveying means (so-called vibration feeder) that conveys articles by vibration. On the other hand, in the conveying means 3 according to the present embodiment, the article 100 can be efficiently conveyed by the interaction between the pressing from behind by the spiral members 5A and 5B and the sliding of the descending slope. In addition, in a state where the rotational driving of the spiral members 5A and 5B is stopped, the spiral members 5A and 5B function as a stopper for stopping the unintended sliding of the article 100. Accordingly, the spiral members 5A and 5B are rotationally driven in the head H in which the article 100 is not stored in the pool hopper 7, and the spiral members 5A and 5B are rotationally driven in the head H in which the article 100 is stored in the pool hopper 7. By not, the article 100 can be supplied aiming at the pool hopper 7 that needs to supply the article 100. The control unit 20 can determine whether or not the article 100 is stored in each pool hopper 7 based on the weighing signal input from the weighing means 10 of each head H.

  The article 100 discharged from the transport means 3 is supplied to the pool hopper 7 and temporarily stored in the pool hopper 7. Based on the weighing signal input from the weighing means 11 of each head H, the control unit 20 identifies the weighing hopper 8 in which the article 100 is not stored. Then, for the head H in which the articles 100 are not stored in the weighing hopper 8, the articles 100 stored in the pool hopper 7 are discharged from the pool hopper 7 by opening the gate 7 </ b> G by a drive signal.

  The article 100 discharged from the pool hopper 7 is supplied to the weighing hopper 8, temporarily stored in the weighing hopper 8, and weighted by the weighing means 11. With reference to FIG. 6, the weighing signal S <b> 1 output from each weighing unit 11 is input to the selection unit 41. In addition, the target weight value M0 (2000 g) and the allowable overdose error G1 (+10 g) are previously taught in the selection unit 41 as a signal S0. The selection unit 41 can obtain the allowable upper limit weight value M1 (2010 g) by adding the allowable overdose error G1 to the target weight value M0.

  The selection unit 41 is a total weight that matches or is closest to the target weight value M0 within an allowable range of the target weight value M0 or more and the allowable upper limit weight value M1 or less among all the weighing hoppers 8 storing the article 100. A combination of the weighing hoppers 8 realizing the value W is obtained by calculation. Then, for the selected weighing hopper 8 as an object, the gate 100 is opened by the drive signal S <b> 2 to discharge the article 100 stored in the selected weighing hopper 8 from the weighing hopper 8. Further, the selection unit 41 stores the total weight value W of these articles 100 in the storage unit 42 as a signal S3.

  The articles 100 discharged from the weighing hopper 8 are collected by the collecting chute 12 and discharged from the combination weighing device 1 toward downstream equipment (not shown). A booster hopper may be arranged between each weighing hopper 8 and the collecting chute 12.

  By repeating the above operation, the storage unit 42 accumulates the total weight value W obtained in each measurement.

  Referring to FIG. 6, setting unit 43 reads a plurality of total weight values W obtained by the latest weighing (in the following example, 10 times) from storage unit 42 as signal S <b> 4. An average value A of the total weight value W is calculated. In addition, the data table 50 stored in advance in the storage unit 44 is input to the setting unit 43 as a signal S5.

  FIG. 7 is a diagram illustrating an example of the data table 50. In the data table 50, a correspondence relationship between the average value A and the allowable overdose error G is defined. In the example shown in FIG. 7, an allowable overdose error G1 of +10 g is defined corresponding to an average value A of 2000 g or more and less than 2005 g, and an allowable overdue of +15 g corresponding to an average value A of 2005 g or more and less than 2010 g. An error G2 is defined, an allowable overdose error G3 of +20 g is defined corresponding to an average value A of 2010 g or more and less than 2015 g, and an allowable overdose of +30 g corresponding to an average value A of 2015 g or more and less than 2020 g An error G4 is defined, and an allowable overdose error G5 of +50 g is defined corresponding to the average value A of 2020 g or more and 2050 g or less.

  With reference to FIG. 6, the setting unit 43 variably sets the allowable overdose error G according to the average value A of the ten most recent total weight values W calculated above by referring to the data table 50. To do.

  FIG. 8 is a diagram showing 14 total weight values W1 to W14 obtained in this order. The setting unit 43 calculates an average value A1 of the total weight values W1 to W10. If the average value A1 is 2000 g or more and less than 2005 g, the current allowable overdose error G1 is maintained. On the other hand, if the average value A1 is greater than or equal to 2005 g and less than 2010 g, the current allowable overdose error G1 is changed to the allowable overdose error G2. The setting information of the allowable overdose error G by the setting unit 43 is input to the selection unit 41 as a signal S6. In the current measurement (that is, the next measurement after the measurement that has obtained the total weight value W10), the selection unit 41 performs an operation for obtaining a combination using the allowable excess error G given by the signal S6.

  When the signal S6 indicates the allowable overload error G1, the selection unit 41 obtains the allowable upper limit weight value M1 (2010 g) by adding the allowable overload error G1 to the target weight value M0. Then, among all the weighing hoppers 8 that store the articles 100, the total weight value W11 that matches or is closest to the target weight value M0 within the allowable range of the target weight value M0 or more and the allowable upper limit weight value M1 or less. A combination of the weighing hoppers 8 to be realized is obtained by calculation.

  On the other hand, when the signal S6 indicates the allowable overdose error G2, the selection unit 41 obtains the allowable upper limit weight value M2 (2015g) by adding the allowable overdose error G2 to the target weight value M0. And among all the weighing hoppers 8 storing the article 100, the total weight value W11 that matches or is closest to the target weight value M0 within the allowable range of the target weight value M0 or more and the allowable upper limit weight value M2 or less. A combination of the weighing hoppers 8 to be realized is obtained by calculation.

  In the next measurement after the measurement of obtaining the total weight value W11, the setting unit 43 sets the allowable overdose error G based on the average value A2 of the total weight values W2 to W11, and the selection unit 41 sets the An operation for obtaining a combination is performed using the set allowable overdose error G. The same applies to the subsequent weighing.

  FIG. 9 is a diagram illustrating a relationship between the allowable overdose errors G1 to G5 and the allowable upper limit weight values M1 to M5. As shown in FIG. 9, when the allowable overdose error G1 (+10 g) is set, the allowable upper limit weight value M1 is 2010 g, and when the allowable overdose error G2 (+15 g) is set, the allowable upper limit weight value is set. M2 is 2015 g. When the allowable overdose error G3 (+20 g) is set, the allowable upper limit weight value M3 is 2020 g. When the allowable overdue error G4 (+30 g) is set, the allowable upper limit weight value M4 is When the allowable overdose error G5 (+50 g) is set, the allowable upper limit weight value M5 is 2050 g.

  When the number of empty weighing hoppers 8 increases due to the delay in supplying the articles 100 to the respective weighing hoppers 8, the total number of combination candidates decreases, so that a total weight value W close to the target weight value M0 is obtained. Is less likely to be That is, even within the permissible range of the permissible upper limit weight value M or less, there is a high possibility that the total weight value W closer to the permissible upper limit weight value M is obtained than the target weight value M0. When the number of empty weighing hoppers 8 tends to increase as described above, the allowable upper limit weight value M is gradually changed from M1 to M2 to M3 to M4 to M5. As a result, it is possible to avoid a situation in which combination failure occurs frequently, so that the operating rate of the combination weighing device 1 can be improved. The same applies not only when the number of empty weighing hoppers 8 tends to increase, but also when the average weight of the single article 100 tends to increase.

  On the other hand, when the number of empty weighing hoppers 8 decreases as the supply of the articles 100 to the respective weighing hoppers 8 progresses, the number of combination candidates increases, so that the target weight value is higher than the allowable upper limit weight value M. The possibility of obtaining a total weight value W close to M0 is increased. Thus, when the number of empty weighing hoppers 8 tends to decrease, the allowable upper limit weight value M is changed to a value lower than the current set value. Thereby, since the situation where the product with a big error from the target weight value M0 generate | occur | produces can be suppressed, measurement precision can be improved. The same applies not only when the number of empty weighing hoppers 8 tends to decrease, but also when the average weight of the single article 100 tends to decrease.

  FIG. 10 is a diagram illustrating an example of processing when the allowable upper limit weight value M is decreased. Here, it is assumed that the currently set allowable upper limit weight value M5 can be lowered to the allowable upper limit weight value M1. Such a situation may occur when the rod of the article 100 is changed and the average weight of the single body is extremely reduced.

  In the pattern P1, first, the allowable upper limit weight value M5 is lowered to the lower limit allowable upper limit weight value M4, and the measurement is performed a predetermined number of times (for example, five times) in this state. If the situation that can be lowered to the upper limit is continued, the allowable upper limit weight value M4 is lowered to the lower limit allowable upper limit weight value M3. Next, if a predetermined number of times (for example, five times) of weighing is performed in a state where the allowable upper limit weight value M3 is set, and the state where the measurement can be reduced to the allowable upper limit weight value M1 at the time of completion of execution, The allowable upper limit weight value M3 is lowered to an allowable upper limit weight value M2 that is one step lower. Next, if a predetermined number of times (for example, five times) of measurement is performed in a state where the allowable upper limit weight value M2 is set, and the situation where the measurement can be reduced to the allowable upper limit weight value M1 at the time of completion of execution, The allowable upper limit weight value M2 is lowered to the allowable upper limit weight value M1 by one step. Thus, when lowering the allowable upper limit weight value M, when the allowable upper limit weight value M is decreased, the operating rate is rapidly decreased by decreasing the allowable upper limit weight value M gradually, not rapidly. It becomes possible to avoid the situation.

  In the pattern P2, the allowable upper limit weight value M5 is directly reduced to the allowable upper limit weight value M1. That is, the allowable upper limit weight value M5 is changed to the allowable upper limit weight value M1 without going through temporary setting to the allowable upper limit weight values M4, M3, and M2. Thereby, since the total weight value W close to the target weight value M0 can be obtained at an early stage, it becomes possible to quickly recover the weighing accuracy that has decreased due to the increase in the allowable upper limit weight value M. .

  In the pattern P3, first, the allowable upper limit weight value M5 is lowered to the lower limit allowable upper limit weight value M4, and a predetermined number of times (for example, five times) are measured in this state. If the situation where it can be lowered to the upper limit weight value M4 continues, the allowable upper limit weight value M4 is directly lowered to the allowable upper limit weight value M1. Thus, when the difference in weight between the allowable upper limit weight value M and the target weight value M0 is relatively large, the allowable upper limit weight value is decreased by lowering the allowable upper limit weight value M5 to the lower limit allowable upper limit weight value M4. It is possible to avoid a situation in which the operating rate rapidly decreases due to the decrease in M. Further, when the difference in weight between the allowable upper limit weight value M and the target weight value M0 is relatively small, the measurement accuracy can be recovered early by directly reducing the allowable upper limit weight value M4 to the allowable upper limit weight value M1. It becomes possible.

  As described above, according to the combination weighing device 1 according to the present embodiment, the setting unit 43 performs the allowable overdose error G based on the average value A of the plurality of total weight values W obtained by the latest plurality of weighings. Is set to be variable. Thus, the allowable upper limit weight value M is variably set based on the average value A. When the average value A is close to the allowable upper limit weight value M, increasing the allowable upper limit weight value M widens the allowable range, so that the possibility of obtaining the total weight value W within the allowable range in subsequent weighing increases. . As a result, since the possibility that the combination is not established is reduced, the operating rate of the combination weighing device 1 can be improved.

DESCRIPTION OF SYMBOLS 1 Combination measuring device 8 Weighing hopper 11 Weighing means 20 Control part 41 Selection part 43 Setting part 50 Data table 100 Article

Claims (4)

A plurality of hoppers for storing articles;
Weighing means for weighing the articles stored in each of the hoppers;
Selection means for selecting a hopper combination that obtains a total weight value that is greater than or equal to a target weight value and less than or equal to an allowable upper limit value among the plurality of hoppers based on the weighing results of the plurality of weighing means;
Based on a data table in which a correspondence relationship between a plurality of average values and a plurality of allowable upper limit values is defined , an allowable upper limit value corresponding to an average value of a plurality of the total weight values obtained by the most recent multiple measurements is determined. Setting means for variably setting the allowable upper limit value by specifying from the data table ,
In the data table, at least three allowable upper limit values are set according to the average value,
When the setting means increases the allowable upper limit value, the setting means changes the currently set allowable upper limit value to an upper limit value that is one step higher .   The setting means includes at least an allowable upper limit value of the first stage, an allowable upper limit value of the second stage higher than the allowable upper limit value of the first stage, and a third stage higher than the allowable upper limit value of the second stage. And an allowable upper limit value can be set.
  When the setting means lowers the allowable upper limit value of the third stage to the allowable upper limit value of the first stage, after changing the allowable upper limit value of the third stage to the allowable upper limit value of the second stage, The combination weighing device according to claim 1, wherein the allowable upper limit value of the second stage is changed to the allowable upper limit value of the first stage.   The setting means includes at least an allowable upper limit value of the first stage, an allowable upper limit value of the second stage higher than the allowable upper limit value of the first stage, and a third stage higher than the allowable upper limit value of the second stage. And an allowable upper limit value can be set.
  The setting means changes the allowable upper limit value of the third stage to the allowable upper limit value of the first stage when the allowable upper limit value of the third stage is lowered to the allowable upper limit value of the first stage. Item 2. The combination weighing device according to Item 1.   The setting means includes at least an allowable upper limit value of the first stage, an allowable upper limit value of the second stage higher than the allowable upper limit value of the first stage, and a third stage higher than the allowable upper limit value of the second stage. And an allowable upper limit value of the fourth stage higher than the allowable upper limit value of the third stage can be set,
  When the setting means lowers the allowable upper limit value of the fourth stage to the allowable upper limit value of the first stage, after changing the allowable upper limit value of the fourth stage to the allowable upper limit value of the third stage, The combination weighing device according to claim 1, wherein the allowable upper limit value of the third stage is changed to the allowable upper limit value of the first stage.

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