JP2013234897A - Combination balance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide information useful for selecting the way of placing an object for measurement on a measuring plate when combination measurement with the designated number of plates is performed.SOLUTION: The number of measuring plates R and the number of combinations M used for combination measurement are set, so as to display and output information of selectable combinations as a selection table, the information of selectable combinations including, when the R measuring plates is separated into two groups A and B, the number of the measuring plates ka and kb for each group, the number of objects for measurement to be placed A' and B' for each group, and the selection number of the measuring plates m to be selected from each group so as to achieve the combination number M. An operator selects combinations by referring to the selection table.

Description

  The present invention relates to a combination weigher that measures the weight of an object to be weighed, and more particularly to a manual combination weigher in which an operator supplies and discharges an object to be weighed.

  2. Description of the Related Art Conventionally, there is a manual combination weigher that manually supplies and discharges an object to be weighed (see, for example, Patent Documents 1 and 2).

  Such a manual combination weigher has a plurality of weighing pans equipped with load detectors such as load cells. When an operator places a weighing object on each weighing pan, the weight of the weighing object on each weighing pan is loaded. The combination calculation is performed based on the weight value of each weighing pan after being measured by the detector. When the combined weight, which is the total weight of the objects to be weighed, becomes an optimum combination that falls within the allowable weight range, each weighing pan corresponding to the combination is turned on by turning on a combination lamp provided in the vicinity thereof. The person drops the object to be weighed from the weighing pan whose combination lamp is lit.

  In such a manual combination weigher, it is possible to perform combination weighing by designating the number of objects to be weighed. For example, five carrots having substantially the same weight are selected, and a pack of 5 bottles within an allowable weight range is selected. For example, combination weighing is performed by designating five carrots.

  In this case, when an operator puts one carrot on each weighing pan, a combination calculation is performed based on the weight value of each weighing pan, and a combined weight value that is a total weight value of a set of five weighing pans is obtained. The optimum combination within the allowable weight range is selected, and for each weighing pan corresponding to the optimum combination, the combination lamp provided near each weighing pan is turned on, so that the operator turns on the combination lamp. A carrot pack of 5 bottles with a combined weight within an allowable weight range can be produced by unloading the carrot from the weighing pan.

JP-A-3-251725 Japanese Patent Laid-Open No. 2-10227

  As described above, in the case of combination weighing in which the number is specified, it is more likely that the combination calculation is achieved because the number of combinations is the largest when one object is placed on each weighing pan.

  However, placing one object to be weighed on each weighing pan one by one and dropping the objects to be weighed one by one from each weighing pan of the optimal combination is achieved, for example, for a pack of 5 packs as described above In the case of weighing, it is necessary to put one carrot on each of the five weighing pans, and to drop one carrot from each of the five weighing pans of the optimum combination.

  Therefore, it is conceivable to improve the workability by reducing the number of loading / unloading of objects to / from the weighing pan, even if the probability of the combination calculation is satisfied, but with conventional combination weighers, The operator is provided with useful information such as how to place the object to be weighed and how it can be selected and how the workability such as the number of times the object to be weighed is loaded and unloaded. For this reason, there is a problem that an operator is forced to perform a combination weighing operation by adopting a limited method of placing objects to be weighed.

  The present invention has been made in view of the above points, and provides information useful for selecting how to place an object to be weighed on a weighing unit when performing combination weighing with a specified number. The purpose is to be able to provide.

  In order to achieve the above object, the present invention is configured as follows.

  (1) The combination weigher of the present invention is selected as an optimal combination by manually placing objects to be weighed on a plurality of weighing units, performing a combination calculation based on the weight values of the objects to be weighed in each weighing unit. A combination weigher in which an object to be weighed placed on a weighing unit is manually lowered; setting means for setting setting information substantially including the number of combinations of the objects to be weighed; Combination calculation means for performing the combination calculation based on the weight value of the weighing object and selecting the optimum combination having a combination weight value within an allowable weight range; and selection information output for outputting selection information based on the setting information And the selection information output means, when the plurality of weighing units are divided into a plurality of groups in which the number of the objects to be weighed placed on each weighing unit is different for each group. And the number of items described above, Selection information including a selectable combination with the selected number of weighing units for each group selected to be the number of combinations, and the combination calculation means is configured to output the selection unit of the weighing unit for each group. The combination calculation according to the number of selections is possible.

  The fact that the number of combinations of objects to be weighed is substantially included means that the number of combinations of objects to be weighed is directly included as setting information, or information that can calculate the number of combinations of objects to be weighed is setting information In this case, the number of combinations of objects to be weighed is indirectly included. Information that can calculate the number of combinations of objects to be weighed includes, for example, the combination target weight (or the lower limit of the allowable weight range) and the average weight of the objects to be weighed. By dividing the lower limit value by the average weight of the objects to be weighed, the number of objects to be weighed can be obtained.

  The number of groups may be set in the setting information, but the number of groups may be fixed to, for example, two.

  Although it is preferable that the number of measuring units for each group can be selected variously, the number of measuring units in each group may be fixed to the same number, for example.

  The number of weighing units selected for each group selected to be the number of combinations is the number of weighing units selected for each group, and for each group selected as the optimal combination when the combination calculation is established. The number of measuring parts. Therefore, when the combination calculation is established, the object to be weighed is dropped from the weighing unit, so that the number of weighing units for dropping the object to be weighed is obtained. If the number of weighing units is large, the number of loading / unloading of objects to be weighed increases, and if the number is small, the number of loading / unloading of objects to be weighed decreases. Thus, workability can be determined.

  It is preferable that the selection number of the weighing unit for each group can be variously selected for each group. For example, for a specific group, the selection number of the weighing unit may be fixed to, for example, In this case, for a specific group in which the number of selections of the weighing unit is fixed, the number of selections of the weighing unit may be excluded from the selection information.

  The selection information output means may be a display output, a print output, a voice output, or a transmission output of the selection information to another output device, or a combination of these outputs.

  Since the selection information includes a selectable combination of the number of objects to be weighed placed on each weighing unit for each of a plurality of groups and the selected number of weighing units for each selected group. It is preferable to display and display the above-mentioned set number and the selected number of measuring units for each group in association with each other.

  The combination calculation means can perform a combination calculation according to the number of selection of the weighing unit for each group. For example, if a plurality of weighing units are divided into two groups, the first and second groups, the number of selections of the weighing units in the first group is 1, and the number of selections of the weighing units in the second group is 2. The combination calculation means combines various weight values of any one weighing unit in the first group of weighing units and each weight value of any two weighing units in the second group of weighing units. It is possible to select an optimum combination whose combination weight value is within an allowable weight range.

  According to the combination weigher of the present invention, when a plurality of weighing units are divided into a plurality of groups with different numbers of objects to be weighed, the number of objects to be weighed on each weighing unit for each group Since various selectable combinations with the selected number of weighing units for each group are output, the user can change the number of objects to be weighed in each weighing unit for each group. As well as being able to grasp what kind of loading method can be selected, it is possible to grasp the number of loading / unloading of objects to be weighed from the number of weighing units selected for each group, so that workability is considered, It is possible to select an appropriate method for placing an object to be weighed.

  (2) In a preferred embodiment of the combination weigher of the present invention, the selection information output means selects the number of the weighing units for each group, the number of placements for each group, and the number of combinations. The selection information including a selectable combination with the selected number of the weighing units for each group is output.

  According to this embodiment, since the number of weighing units for each group is added to the selectable combinations of the above-mentioned set number for each group and the selected number of weighing units for each group, the number of combinations that can be selected by the user is As a result, the number of objects to be weighed can be selected.

  (3) In another embodiment of the combination weigher of the present invention, the setting information includes the number of weighing units used for weighing the object to be weighed among the plurality of weighing units, and the selection information output means Divides a plurality of measuring units to be used into the plurality of groups, and outputs the selection information for each of the divided groups.

  The weighing units used for weighing the objects to be weighed may be all the weighing units among the plurality of weighing units.

  According to this embodiment, since the user can set the number of measuring units to be used, for example, the number of measuring units to be used can be selected according to the number of persons performing the work.

  As another embodiment of the present invention, all of the weighing units provided in the combination weigher may be used, and the setting of the number of weighing units to be used may be unnecessary.

  (4) In still another embodiment of the combination weigher of the present invention, the selection information output means can be selected based on the number of weighing units for each group and the selected number of weighing units for each group. The number of weighing unit combinations is calculated, and the calculated number of weighing unit combinations is output as the selection information.

  The greater the number of combinations of weighing units that can be selected, the greater the number of combinations that can be realized, that is, the combination weight that belongs to the allowable weight range increases. For example, the optimum combination is closest to the lower limit weight in the allowable weight range. If this is done, the probability that a combination close to the lower limit weight is selected is increased.

  According to this embodiment, since the number of selectable weighing unit combinations is output as selection information, the user considers not only workability but also the feasibility of the combination calculation based on the number of combinations, A more appropriate way of placing an object to be weighed can be selected.

  (5) In another embodiment of the combination weigher of the present invention, the setting information includes weight data of the object to be weighed, and the selection information output means has the weight data of the object to be weighed that is normally distributed. The probability that the combination weight value that falls within the allowable weight range exists is calculated based on the above, and the calculated probability is output as the selection information.

  The weight data of the object to be weighed is preferably an average value and a standard deviation of the weight values of the plurality of objects to be weighed.

  The average value and the standard deviation of the weight values of the objects to be weighed may be calculated by actually weighing a plurality of samples of the objects to be weighed by the combination weigher. The average value and the standard deviation of the weight value of the weighing object may be set directly.

  According to this embodiment, the probability that there is a combination weight value that falls within the allowable weight range is calculated based on the weight data of the object to be weighed as a normal distribution, and is output as selection information. In consideration of the probability that the combination weight value that is inside exists, it is possible to select how to place the object to be weighed.

  (6) In the embodiment of (5), the selection information output means is based on the number of combinations of the weighing units that can be selected and the probability that the combination weight value within the allowable weight range exists. Then, a combination establishment index relating to the establishment of the optimal combination may be calculated, and the calculated combination establishment index may be output as the selection information.

  According to this embodiment, since the combination establishment index relating to the establishment of the optimal combination is calculated and output as selection information, the user can select how to place the objects to be weighed in consideration of the establishment of the optimum combination. it can.

  Thus, according to the present invention, when the plurality of weighing units are divided into a plurality of groups in which the number of objects to be weighed is different for each group, the objects to be weighed in each weighing unit for each group are loaded. Various selectable combinations of the set number and the selected number of weighing units for each group are output as selection information, so that the user can grasp how to place various selectable objects, Select the combination weight as close to the lower limit weight as possible, considering the workability such as the number of weighing parts to be loaded / unloaded from the number of weighing units for each group or depending on the size of the optimal combination. Therefore, it is possible to select an appropriate method for placing an object to be weighed.

FIG. 1 is a perspective view of a combination weigher according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the combination weigher of FIG. FIG. 3 shows the number of weighing pans ka and kb of each group A and B when the number of weighing pans R = 10 and the number of combinations M = 5, and the number of objects to be weighed on each weighing pan A ′ and B It is a figure which shows the combination of '. FIG. 4 is a flowchart showing a process for generating selection information. FIG. 5 is a diagram showing a display example of a selection table as selection information when the number of weighing pans R = 10 and the number of combinations M = 5 are set. FIG. 6 is a diagram showing a display example of a selection table as selection information when the number of weighing pans R = 8 and the number of combinations M = 5 are set. FIG. 7 is a diagram showing a display example of a selection table as selection information when the number of weighing pans R = 10 and the number of combinations M = 4 are set. FIG. 8 is a diagram showing a display example of a selection table as selection information when the number of weighing pans R = 10 and the number of combinations M = 3 are set. FIG. 9 is a diagram showing a combined weight distribution and an allowable weight range. FIG. 10 is a diagram showing a standard normal distribution table.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a combination weigher according to one embodiment of the present invention.

  A combination scale 1 according to this embodiment is a manual combination scale, and supports a plurality of weighing dishes 2 on which objects to be weighed such as the above-mentioned agricultural products such as carrots and marine products, and the weighing dishes 2 are supported. And a control unit 4 that performs various settings and displays.

  Each weighing pan 2 is connected to each load sensor (not shown) below the weighing pan 2, and each weighing pan 2 and each load sensor constitute a weighing unit for weighing an object to be weighed placed on each weighing pan 2. The In this embodiment, the weighing pan 2 is arranged with a total of 10 plates on the frame portion 3 in 5 plates. The combination scale 1 is a manual type, and an operator directly loads and unloads an object to be weighed on each weighing pan 2.

  At the center in the width direction of the frame portion 3, ten combination lamps 5 made of LEDs or the like are installed along the longitudinal direction so as to individually correspond to each weighing pan 2. When the combination lamp 5 is lit in green, the operator can recognize the weighing pan 2 selected as the optimum combination after the combination calculation is established, or can recognize an error or the like by blinking red. At the center of one end side in the longitudinal direction of the frame part 3, a reset button 6 is provided for recalculating the combination.

  The control unit 4 is located on the other end side in the longitudinal direction of the frame unit 3, and an operation setting display unit 7 including a touch panel is provided on the front surface thereof. The operation setting display unit 7 displays a screen for inputting combination conditions, setting information to be described later, a result of combination calculation, a screen for selection information to be described later, and the like. In this embodiment, the combination condition includes a lower limit value WL (g) and an upper limit value WU (g) of a combination weight that defines an allowable weight range described later.

  FIG. 2 is a block diagram of the combination weigher 1 of FIG. 1, and parts corresponding to those in FIG.

  As described above, each weighing unit 12 that measures the weight of an object to be weighed placed on each weighing pan 2 is configured by each weighing pan 2 and each load sensor 11 connected to each weighing pan 2. The

  The control unit 4 includes an arithmetic control unit 9 and a memory 10 and also includes the operation setting display unit 7 described above. The arithmetic control unit 9 and the memory 10 are configured by, for example, a microcomputer. The arithmetic control unit 9 of the control unit 4 performs the following arithmetic control. That is, the weight of the object to be weighed is calculated based on the load signal from the load sensor 11 of each weighing unit 12, and the calculated weight is stored in the memory 10. Further, based on the calculated weight of the object to be weighed, a combination operation is performed according to how to place the object to be weighed selected as described later and how to select the weighing pan 2, and the total weight of the object to be weighed is calculated. When one combination of the weighing units 12 in which the combination weight value is within the allowable weight range is searched and the combination calculation is established and the one combination is obtained, the combination is determined as the optimum combination. When there are a plurality of combinations that are within the allowable weight range, one combination of the weighing units 12 that is the same as or closest to the lower limit value of the allowable weight range is selected, and the combination is set as the optimal combination.

  Then, the combination lamp 5 corresponding to the weighing pan 2 of the weighing unit 12 selected as the optimum combination after the combination calculation is established lights up in green, and the total weight (combination weight value) of the objects to be weighed in the optimum combination is operated. It is displayed on the setting display unit 7.

  The operator drops the objects to be weighed in the weighing pan 2 of the optimum combination whose combination lamp 5 is lit in green, and packs them together in, for example, one bag. The total number of the packed objects to be weighed becomes the designated combination number, and the combined weight value which is the total weight of the objects to be weighed is within the allowable weight range.

  In addition, the calculation control unit 9 generates selection information including how to place an object to be weighed on the weighing pan 2 as described later, and displays and outputs the selection information on the operation setting display unit 7. The control unit 4 constitutes selection information output means.

  In this embodiment, the operator can select what manner of placing the objects to be weighed on the weighing pan 2 before operating the combination weigher 1 and starting the actual combination weighing operation. Also, in order to know the workability of how to put it, it is as follows.

  That is, in this embodiment, the operator operates the operation setting display unit 7, sets the selection mode, and sets the required setting information, whereby the selection information regarding how to place the object to be measured is displayed on the operation setting display. Displayed in part 7.

  In this embodiment, as setting information, the number R of weighing pans 2 used for combination weighing, the number M of combinations of objects to be weighed, the lower limit WL (g) that defines the allowable weight range of the combination weight, and the allowable weight range. Is set to an upper limit value WU (g).

  Further, in this embodiment, as setting information, the average weight wa (g) of the individual objects to be weighed and the weight of the objects to be weighed are normally distributed, and the standard deviation σ1 = s ( g) is set. The average weight wa and the standard deviation σ1 = s of the weighing object can be obtained in advance by actually weighing the weight of the sample of the weighing object.

  The number R of the weighing pans 2 used for the combination weighing is R ≧ 2, and the number M of the objects to be weighed is M ≧ 3. In the combination balance 1 of this embodiment, since the total number of the weighing pans 2 is 10 as described above, the operator sets a numerical value of 2 ≦ R ≦ 10 as the number R of the weighing pans 2 to be used. In addition, a numerical value of M ≧ 3 is set as the number M of combinations of the objects to be weighed. As the combination number M, for example, when five combination weighings of carrots are performed as described above, M = 5 is set as the combination number M.

  Note that the number R of the weighing pans 2 used for the combination weighing may be fixed to the total number (R = 10) of the weighing pans 2 provided in the combination weigher 1, and the setting of the number of plates R may be unnecessary.

  The number of combinations M may be set directly. For example, the number of combinations M is the lower limit WL (or combination target weight) that defines the allowable weight range of the combination weight by the average weight of the objects to be weighed. Since it can be calculated by dividing, the combination number M may be set indirectly by setting the lower limit WL (or combination target weight) and the average weight of the objects to be weighed. Should be set substantially.

  Based on the above setting information, the control unit 4 of the combination weigher 1 can select what manner of placing the object to be weighed on the weighing pan 2 and how the workability is determined by the operator. Selection information is generated and displayed on the operation setting display unit 7 so that it can be grasped.

  In this embodiment, selection information is generated under the following conditions.

  (1) The weighing pan 2 with the number R of pans used for the combination weighing is divided into two groups A and B in which the number of objects to be weighed is different, and the weighing pan 2 belonging to the A group always has one weighing. Select dish 2 only.

  The A group is prioritized over the B group, and only one weighing pan 2 is always selected from the A group. In this embodiment, only one of the weighing pans of group A is selected. However, as another embodiment, two plates, three plates, or the like may be selected.

(2) The number A ′ of the object to be weighed on the weighing pan 2 of the A group, and the number B ′ of the object to be weighed on the weighing pan 2 of the B group,
A '>B'
And

  The number of objects to be weighed in the A group having priority is set to be larger than the number of objects to be weighed in the B group.

  (3) Two or more objects to be weighed are placed on the weighing pan 2 of the A group. On the weighing pan 2 of the priority group A, more than one weighing object, which is the minimum number of weighing objects placed on the weighing pan 2 of the B group, is placed.

  The combination number M of the objects to be weighed set from the operation setting display section 7, the number A ′ of the objects to be weighed on the weighing pan 2 of the A group, and the loading of the objects to be weighed on the weighing pan 2 of the B group The following equation holds between the set number B ′.

A '+ B' · m = M
Here, m is an integer greater than 1. This m is the number of weighing pans 2 selected from the B group.

  Since the A group always selects only one weighing pan 2, the number of objects to be weighed selected from the A group is A ', and the number of weighing pans 2 selected from the B group is m. The number of objects to be weighed selected from the B group is B ′ · m, and the sum is the number M of objects to be weighed.

(4) Number of weighing pans in group A ≤ Number of weighing pans in group B Since group A has a larger number of objects to be weighed than group B, the number of weighing pans should be less than the number of weighing plates in group B. is there.

  (5) Furthermore, the number of plates ka of the weighing pan 2 of the A group is 1 ≦ ka ≦ R / 2.

  However, when (R / 2) is not an integer, it is set as an integer value rounded down to the nearest decimal point.

In addition, the number kb of the weighing pans 2 of the group B corresponds to the value of ka kb = R−Ka
Is set to the value of

(6) The number A ′ of objects to be weighed on the weighing pan 2 of the A group is
M-1 ≧ A ′ ≧ 2
It is set in the range.

  The number A ′ of the objects to be weighed on the weighing pan 2 of the A group is two or more as described above, and is one more than the combination selection number M of the objects to be weighed in consideration of the minimum number of the B group. A small number is the upper limit.

(7) Also, the number B ′ of the objects to be weighed on the weighing pan 2 of the B group is:
A′−1 ≧ B ′ ≧ 1
It is.

  Since the number B ′ of the objects to be weighed on the weighing pan of group B is smaller than the number of objects A ′ to be weighed on the weighing pan of group A as described above, A′−1 is set to the upper limit value. And

  Note that some of these conditions may be variably set by operating the operation setting display unit 7.

  Based on the above conditions and the setting information set by the operator operating the operation setting display unit 7, the control unit 4 generates selection information and displays it on the operation setting display unit 7 as a selection table.

  Hereinafter, a case where some specific numerical values are set as the number R of the weighing pans and the number M of the combinations will be described.

  FIG. 3 shows the number of weighing pans ka and kb of each group A and B when the number of weighing pans R = 10 and the number of combinations M = 5 are set. It is a figure which shows the combination of mounting number A 'and B'. In each column of C = 1 to C = 20 of the number of objects to be weighed in the groups A and B in FIG. 3, each of the 10 weighing dishes 2 is indicated by a circle, and the objects to be weighed in the weighing dish 2 are displayed. The number of placements is indicated by numerical values in the circles.

  In FIG. 3, the number C can select the number of weighing pans ka and kb of each group A and B, and the number of objects to be weighed A ′ and B ′ placed on each weighing pan 2 of each group A and B. This is a selection number that identifies a combination.

  As shown in FIG. 3, for example, there are four combinations of selection numbers C = 1 to 4 in which the number of weighing dishes ka and kb of each group A and B are equal (ka = kb = 5). In the selection number C = 1, the number A ′ = 2 of the objects to be weighed on the weighing pan 2 of the A group = 2 and the number B ′ = 1 of the objects to be weighed placed on the weighing pan 2 of the B group are selected. When the number C = 2, the number A ′ = 3 of the objects to be weighed on the weighing pan 2 of the A group is 3, and the number B ′ = 2 of the objects to be weighed on the weighing pan 2 of the B group is the selection number. When C = 3, the number A ′ = 3 of the objects to be weighed on the weighing pan 2 of the A group = 3, the number B ′ of the objects weighed on the weighing pan 2 of the B group = 1, and the selection number C = 4, the number of objects to be weighed A '= 4 on the weighing pan 2 of the A group = 4, and the number of objects weighed on the weighing pan 2 of the B group = 1.

  There are four combinations from group A weighing pan ka = 4 and group B weighing pan kb = 6 from selection number C = 5 to 8, and the weight of the object to be weighed on weighing pan 2 of group A is 4 The placement number A ′ and the placement number B ′ of the object to be weighed on the weighing pan 2 of the B group are the same as the selection numbers C = 1 to 4.

  Furthermore, there are four combinations of the group A weighing pan ka = 3 and the group B weighing pan kb = 7 from the selection number C = 9 to 12, and the objects to be weighed on the group A weighing pan 2 are The placement number A ′ and the placement number B ′ of the object to be weighed on the weighing pan 2 of the B group are the same as the selection numbers C = 1 to 4.

  Similarly, when the number of weighing pans R = 10 and the number of combinations M = 5, there are 20 ways to place the objects to be weighed as shown in the selection numbers C = 1 to 20, and one of them can be selected. it can.

  FIG. 4 is a flowchart showing a process for generating selection information such as how to place an object to be weighed when the number of weighing pans R = 10 and the number of combinations M = 5 are set.

  First, the operator sets the number of weighing pans R = 10 and the number of combinations M = 5 from the operation setting display unit 7, and the selection number C is initialized to 1 (step n1). Next, the group A weighing pan ka is calculated by the above-mentioned ka = R / 2 (step n2), and the group B weighing pan kb is calculated by the above-mentioned kb = R-ka ( Step n3).

  Next, the number A ′ of the objects to be weighed on the weighing pan 2 of the A group is set to 2 which is the minimum value (step n4), and the number of objects B ′ to be weighed on the weighing pan 2 of the B group is , A′−1 (step n5), and the above-mentioned A ′ + B ′ · m = M obtains m which is the number of weighing pans 2 selected from the B group (step n6).

  Next, the number of weighing pans A and B, ka, kb, the number of objects to be weighed A ′ and B ′ on the weighing pan 2 of the A and B groups, the selected number m of the weighing pan 2 of the B group, It is registered in the memory 10 in correspondence with the selection number C (step n7).

  Next, the selection number C is incremented (step n8), the number A ′ of the objects to be weighed placed on the weighing pan 2 of the A group is increased by 1 (step n9), and the number A ′ placed is the combination number M. It is determined whether or not the above has been reached (step n10). If the number of combinations is not equal to or greater than M, the number B ′ of the objects to be weighed on the weighing pan 2 of group B is calculated by A′−1 (step n11). ), It is determined whether or not the number B ′ of the objects to be weighed on the weighing pan 2 of the B group has become 2 (step n12).

  In step n12, when the number B ′ of the objects to be weighed on the weighing pan 2 of the B group is not 2, the selected number m of the weighing pan 2 of the B group is calculated by A ′ + B ′ · m = M. Obtain (Step n13), determine whether m is 1 or more (Step n14), and if not 1 or more, go to Step n16 to place the number of objects to be weighed B 'on the weighing pan 2 of the B group B' 1 is subtracted from, and the process returns to step n13.

  In step n14, when m is 1 or more, the number A 'and B group weighing pans ka, kb, the number of objects to be weighed on the weighing pans of groups A and B corresponding to the selection number C' , B ′, and B group, the selected number m of the weighing pan 2 is registered in the memory 10 (step n15).

  In step n12, when the number B ′ of the objects to be weighed on the weighing pan 2 of the B group is 2, the selection number m of the weighing pan 2 of the B group is obtained by A ′ + B ′ · m = M. (Step n17), it is determined whether m is 1 or more (Step n18). If m is 1 or more, the number of weighing pans ka, kb, A, The number A ′, B ′ of the objects to be weighed on the weighing pan of the B group and the selected number m of the weighing pan 2 of the B group are registered in the memory 10 (step n19), the selection number C is incremented, and the step Move to n21. In step n18, when the selected number m of the weighing pans 2 in group B is not 1 or more, the process proceeds to step n21.

  In step n21, 1 is subtracted from the number B ′ of the objects to be weighed on the weighing pan 2 of the B group, and the selected number m of the weighing pan 2 of the B group is obtained by A ′ + B ′ · m = M. (Step n22), the process proceeds to Step n15.

  In step n10, when the number A ′ of the objects to be weighed on the weighing pan 2 of group A is equal to or greater than the number M of combinations, 1 is subtracted from the number of weighing pans ka of group A (step n23). Is determined to be positive (step n24). If it is positive, the process returns to step n3, and if not positive, the process is completed, and the number of selected combinations for each selection number C described later is calculated. (Step n25).

  Through the above processing, the number of weighing pans ka, kb, and the weighing pans 2 of groups A and B when the number of weighing pans R = 10 and the number of combinations M = 5 are set. Selection information including m, which is the number of weighing pans to be selected from the placement number A ′, B ′, B group, is generated.

  FIG. 5 shows an example in which this selection information is displayed on the operation setting display unit 7 as a selection table.

  In FIG. 5, the numbers A ′ and B of the objects to be weighed placed on the weighing pans 2 of the groups A and B for the selection numbers C = 1 to 20 and the weighing pans 2 of the groups A and B, respectively. In addition to m, which is the number of weighing pans selected from the B group, the number of times of handling, the number of selected combinations Vc, which will be described later, and a combination establishment probability index Qc are also displayed.

  Up to the number A ′, B ′ of the objects to be weighed on the weighing pans 2 of the groups A and B with the selection numbers C = 1 to 20 and the weighing pans 2 of the groups A and B as described above. This is the same as the contents of FIG. In FIG. 5, m, which is the number of weighing pans selected from the B group, and a value obtained by adding m to the number of weighing pans 1 selected from the A group are displayed as the number of times of handling. The number of times of handling means the number of times of handling by hand in order to unload the objects to be weighed from the weighing pans 2 of the A and B groups.

  According to the selection table of FIG. 5, when the number of weighing pans R = 10 and the number of combinations M = 5 are set, how to place the objects to be weighed on the weighing pan 2 that can be selected, that is, the number of weighing pans ka of each group , Kb, the number of objects to be weighed A ′, B ′ on the weighing pan 2 of each group, and a selectable combination of m, which is the number of weighing pans selected from the B group, are selected numbers C = 1 to It can be seen that there are 20 ways up to 20.

  Among the selection numbers C = 1 to 20, for example, when the selection number C = 1, the number of weighing pans ka and kb in each of the groups A and B is 5 and the weighing target 2 on the weighing pan 2 of the A group is to be weighed. The number of objects to be weighed A ′ = 2, and the number of objects to be weighed on the weighing pan 2 of the B group B ′ = 1. In this case, in order to set the number of combinations M = 5, only one of the five weighing pans in the A group is selected as described above, and the weighing pan 2 in the B group is selected from the five pans. It can be seen that m = 3, ie 3 dishes are selected. Therefore, when the combination calculation is established, the object to be weighed is dropped from one dish of the A group and the object to be weighed is dropped from three dishes of the B group, so that the number of handling is four.

  Further, for example, in the selection number C = 5, the number of weighing pans in the A group is ka = 4, the number of weighing pans in the B group is kb = 6, and the number A ′ of the objects to be weighed on the weighing pan 2 of the A group is A ′. = 2 and the number B ′ of the objects to be weighed placed on the weighing pan 2 of the B group = 1.

  In order to set the number of combinations M = 5, only one of the four weighing pans of the A group is selected as described above, and the weighing pan 2 of the B group is three of the six pans ( It can be seen that m = 3) is selected. Therefore, when the combination calculation is established, the object to be weighed is dropped from one dish of the A group and the object to be weighed is dropped from three dishes of the B group, so that the number of handling is four.

  Further, for example, in the selection number C = 10, the number of weighing pans in the A group ka = 3, the number of weighing pans in the B group kb = 7, and the number A ′ of the objects to be weighed on the weighing pan 2 of the A group = 3, the number B ′ = 2 of the objects to be weighed on the weighing pan 2 of the B group = 2. In order to set the number of combinations M = 5, only one of the 3 weighing pans 2 in the A group is selected as described above, and the weighing pan 2 of the B group is 1 in 7 It can be seen that m = 1) is selected. Therefore, when the combination calculation is established, the object to be weighed is dropped from one dish of the A group and the object to be weighed is dropped from one dish of the B group.

  Further, for example, in the selection number C = 14, the number of weighing pans in the A group ka = 2, the number of weighing pans in the B group kb = 8, and the number A ′ of the objects to be weighed on the weighing pan 2 of the A group = 3, the number B ′ = 2 of the objects to be weighed on the weighing pan 2 of the B group = 2. In order to set the number of combinations M = 5, only one of the two weighing pans of the A group is selected as described above, and one of the eight weighing pans of the B group is one ( It can be seen that m = 1) is selected. Therefore, when the combination calculation is established, the object to be weighed is dropped from one dish of the A group and the object to be weighed is dropped from one dish of the B group.

  In this way, according to the selection table displayed on the operation setting display unit 7, the operator can determine how the two weighing trays 2 are divided into two groups A when the number of weighing pans R = 10 and the number of combinations M = 5. , B, and how many the objects to be weighed are placed on each weighing pan 2 of each of the divided groups A and B, and when the combination calculation is established, from what number of weighing pans the objects to be weighed You can see if you need to take it down.

  Since the number of weighing pans 2 selected from the A group is only one plate as described above, and the number of weighing pans 2 selected from the B group is m, the value of this m is used. The number of times of handling is m + 1. Thus, since the magnitude of the number of handlings can be known from the value of m, the display of the number of handlings may be omitted. In this embodiment, since the number of weighing pans 2 selected from the A group is fixed to only one plate, it is not displayed, but the number of weighing pans 2 selected from the A group is also displayed. May be.

  The number of weighing pans R and the number of combinations M are not limited to R = 10 and M = 5 described above, and can be set by operating the operation setting display unit 7 as described above. For example, the number of weighing pans R = 8 When the number of combinations M = 5 is selected, the selection table shown in FIG. 6 can be created and displayed by processing R = 8 and M = 5 in FIG. 4 described above. In this case, it is possible to select 16 ways to place the objects to be weighed with selection numbers C = 1 to 16.

  Similarly, for example, when the number of weighing pans R = 10 and the number of combinations M = 4 are selected, the selection table shown in FIG. 7 can be created. In this case, the selection numbers C = 1 to 10 It is possible to select how to place the 10 objects to be weighed. For example, when the number of weighing pans R = 10 and the number of combinations M = 3 are selected, the selection table shown in FIG. 8 can be created. In this case, the selection numbers C = 1 to 5 are selected. It is possible to select how to place five objects to be weighed.

  Referring to FIG. 5 again, in each loading method of selectable objects to be selected with each selection number C = 1 to 20, the numbers ka and kb of the weighing pans 2 in each group of A and B and from each group Since the selection number of the weighing pan 2 to be selected is known, it is possible to easily calculate how many selection combinations there are, that is, the selection combination number of the combination weight value.

That is, the selected combination number Vc of the combination weight values in each selection number C = 1 to 20 is selected by combining one dish from the A group weighing dish ka and m dishes from the B group weighing dish kb. Therefore, the number Vc of combinations of selected combination weights is
Vc = _ka C ₁・_kb C _m
It becomes.

For example, when the selection number C = 1, the A group selects one of the five weighing pans 2, so there are ₅ C ₁ combinations, and the B group includes the five weighing pans 2. Therefore, there are ₅ C ₃ combinations, so the total number of selected combinations Vc is
Vc = ₅ C ₁ * ₅ C ₃ = 50
It becomes.

  The greater the selected combination number Vc, the higher the probability that the combination selected weight will fall within the allowable weight range. Therefore, the value of the selected combination number Vc is information relating to the establishment of the combination calculation.

  Therefore, in this embodiment, as shown in FIG. 5, the value of the selected combination number Vc is calculated and displayed together with the selection table.

  Therefore, the operator considers the feasibility of the combination calculation based on the value of the number of selected combinations Vc included in the selection table displayed on the operation setting display unit 7, and the weighing object with any selection number C Can be selected.

  Furthermore, in this embodiment, the probability that the combination weight value exists in the allowable weight range of the combination weight defined by the above-described lower limit value WL (g) and upper limit value WU (g) is obtained. Yes.

  As another embodiment of the present invention, assuming that the weight values of the individual objects to be weighed are normally distributed, a predetermined number of random numbers are generated according to the conditions of the normal distribution, and a combination operation according to each selection number C is performed. There is also a method of obtaining the probability of the combination operation by simulation, but a large number of random numbers are required to obtain the reliability of the result, and when all the various selection numbers C are executed, and the allowable weight of the combination weight In the case where the range is changed in various ways, for example, a relatively long time of about several minutes is required.

  On the other hand, in this embodiment, the probability that the combined weight value exists in the allowable weight range is easily obtained in a short time by theoretical calculation.

  First, the weight of each object to be weighed has a normal distribution. The weight distribution of the object to be weighed normally is specified by, for example, the average weight value wa (g) of the object to be weighed and the standard deviation σ1 = s (g) of the weight variation of the object to be weighed.

  In this embodiment, the average weight value wa and the standard deviation σ1 = s of the individual objects to be weighed are set by operating the operation setting display unit 7 as setting information as described above. In another embodiment, the average weight value wa and the standard deviation σ1 of individual objects to be weighed are not set in advance, and are obtained from the weight values of objects to be weighed actually during the operation of combination weighing. May be. In this case, an index Qc relating to the combination establishment described later may be obtained after the operation of the combination weighing is started and the average weight value wa and the standard deviation σ1 of the individual weighing objects are obtained.

A combination weight value obtained by combining the objects to be weighed in normal distribution by a predetermined combination number M is also normally distributed. When M objects to be weighed having the standard deviation value σ1 are collected, the standard deviation σ of the weight variation of the M objects to be weighed is
σ = M ^1/2 · σ1 (1)
It becomes.

Therefore, the standard deviation value S of the combined weight of M objects to be weighed is
S = M ^1/2 · s (g).

In addition, since the average weight value of one object to be weighed is wa, the average value Wa of the M combination weights is
Wa = M · wa (g) (2)
It is.

  Here, for example, as shown in FIG. 9, the lower limit weight value WL (g) and the upper limit weight value WU (g) that define the allowable weight range of the combined weight are respectively centered on the average weight value Wa (g). If it is set, the combination indicated by the hatched and horizontal lines between the lower limit weight value WL and the upper limit weight value WU is within the allowable weight range defined by the lower limit weight value WL and the upper limit weight value Wu. This represents the probability that a candidate exists, that is, the probability P of the optimal combination.

  Therefore, for each of the lower limit weight value WL and the upper limit weight value WU, a deviation of the combined weight value from the average value Wa is obtained.

w1 = Wa-WL (g)
w2 = WU-Wa (g)
Next, by dividing by the standard deviation value S = σ of the combination weight,
k1 = w1 / S, k2 = w2 / S,
Therefore, the above deviation is normalized and w1 = k1 · σ
w2 = k2 · σ (3)
It becomes.

  Each of the normalized deviations w1 and w2 is collated with the standard normal distribution table shown in FIG. 10 stored in the memory 10, so that the combined weight value is calculated from the lower limit weight value WL (= Wa−k1 · σ). Probability P1 that there is a combination weight value that falls within the range up to the average value Wa, and a probability that there is a combination weight value that falls within the range from the average value Wa of the combination weight values to the upper limit weight value WU (= Wa + k2 · σ) Find P2.

  For example, the normalized deviation k1 from the lower limit weight value WL to the combined weight value average value Wa is k1 = 0.02, and the normalized deviation k2 from the combined weight value average value Wa to the upper limit weight value WU is k2 = If it is 0.1, by substituting each of these values into the variable Z in the standard normal distribution table of FIG. 10, the existence probability P1 for the range from the lower limit weight value WL to the average value Wa of the combined weight values Then, P1 = 0.008 is obtained, and the value P2 = 0.0398 can be obtained as the existence probability P2 for the range from the average value Wa of the combined weight values to the upper limit weight value WU.

  In addition, what is necessary is just to calculate by linear interpolation in a standard normal distribution table, when calculating k1 and k2 to three decimal places or less.

  Then, by adding these existence probabilities P1 and P2 to each other, the probability P that the combination weight value exists in the allowable weight range from the lower limit weight value WL to the upper limit weight value WU is obtained.

P = P1 + P2
Accordingly, when P1 = 0.008 and P2 = 0.0398, the probability P that the combination weight value exists is P = 0.0478.

  This is because the probability that an arbitrary set of combination weight values obtained by collecting five individual objects to be weighed having a standard deviation σ1 and an average weight value wa falls within the allowable weight range is P = 0. It means 0478.

Therefore, the index Qc related to the probability of combination product in each selection number C in the selection table is:
According to the selected combination number Vc by the weighing pan 2 of the A and B groups and the probability P that the combination product enters the allowable weight range,
Qc = P * Vc
It is expressed.

  The value of the index Qc related to the combination establishment is also an index related to the establishment of the combination calculation. The larger the value of the index Qc, the higher the possibility that the combination calculation is established and the optimum combination close to the lower limit value is selected. In FIG. 5, this index Qc is also displayed in the selection table in correspondence with the selection number C.

  In this embodiment, for example, the selection table shown in FIG. 5 is displayed on the operation setting display section 7, so that the operator can divide the weighing pan 2 into two groups A and B, The number of objects to be weighed on each weighing pan 2 of each of the groups A and B can be set to what number, and when the combination calculation is established, it is necessary to drop the objects to be weighed from how many pans In addition, it is possible to ascertain the degree of combination calculation between the selection numbers C with different degrees of establishment through mutual comparison.

  Therefore, the worker can easily select how to place the objects to be weighed in consideration of workability according to the type of objects to be weighed, the feasibility of combination calculation, and the like. The selection is performed by operating the operation setting display unit 7 and designating the selection number C.

  In FIG. 5, the selected combination number Vc and the index Qc related to the combination establishment probability are displayed. However, as another embodiment of the present invention, at least one of the selected combination number Vc and the index Qc related to the combination establishment probability is displayed. It may be omitted. When the index Qc relating to the combination establishment probability is omitted or the number of combinations is directly set, the average weight wa of the individual objects to be weighed, the standard deviation σ1 = s of the weight variation of the objects to be weighed, and the allowable weight of the combination It is not necessary to set the lower limit WL that defines the weight range and the upper limit WU that defines the allowable weight range. Further, when the lower limit value WL and the upper limit value WU are not set, for example, a combination target weight value and an upper limit value are set in the operation of combination weighing.

  Next, the setting for each group A and B of the weighing pan 2 after designating the selection number C and the identification of the weighing pan 2 belonging to each group A and B will be described.

  After specifying the selection number C, the operator operates the operation setting display unit 7 to divide, for example, 10 weighing pans 2 into two groups A and B so as to correspond to the specified selection number C. To set. This setting is performed, for example, by designating a pre-registered pan number of each weighing pan 2 and any group of A and B.

  As a result, the control unit 4 of the combination weigher 1 performs combination weighing according to how to place the object to be weighed with the selected selection number C, and how each weighing pan 2 is divided into groups A and B, respectively. Can be recognized.

  Thus, since the operator can arbitrarily set the classification of the weighing pans 2 of the groups A and B according to the selection number C, the number of workers at that time, the type and properties of the objects to be handled, etc. are taken into consideration. Then, it is possible to select which weighing pan 2 belongs to either the A group or the B group. For example, it is possible to classify the weighing pans 2 belonging to the group A having a large number of placements so as to be positioned in front of the operator, thereby facilitating handling work of the objects to be weighed.

  The control unit 4 turns the combination lamp 5 red when the setting of the groups A and B of the weighing pan 2 by the operator does not match the grouping of the selected selection number C. Flashes to notify of setting error.

  An operator who has set the weighing pan 2 to be divided into two groups A and B further measures one group of the weighing pans 2 of the groups A and B, for example, weighing different colors. Replace with a pan or weighing pan of a different size. Thereby, the operator can identify the weighing pans 2 of the groups A and B by color and size.

  When the operator does not set the division for each group of the weighing pans 2, the control unit 4 determines the number of weighing pans ka and kb in each of the groups A and B corresponding to the selected selection number C. As such, it may be automatically classified according to a predetermined rule. In this case, the weighing pan 2 belonging to the A group lights the corresponding combination lamp 5 in green, and the weighing pan 2 belonging to the B group lights the corresponding combination lamp 5 in red to allow the operator to recognize it. It is preferable to do so. As a result, the operator can identify the weighing pan 2 of one group by exchanging it with a weighing pan having a different color or size, as described above.

  Next, a combination calculation when the combination weighing operation operation is started in accordance with how to place the objects selected by the selection number C will be described.

  In the arithmetic control unit 9 of the control unit 4, the weight value weighed by each weighing pan 2 is assigned a code representing either the group A or B to which it belongs.

  The operator places the number of objects to be weighed according to the selection number C on the weighing pans 2 of the groups A and B according to the selected selection number C.

  For example, when the selection mode C = 1 is selected, the operator places two objects to be weighed on the five weighing pans 2 in the A group, and on the five weighing pans 2 in the B group. Place the objects to be weighed one by one.

  The control unit 4 selects any one of the weight values output from the five weighing pans 2 belonging to the A group and three of the five weighing pans belonging to the B group. Select, create weight values for all combinations by them, select the optimal combination weight among the combination weights that fall within the allowable weight range, for example, the combination weight value that is equal to or closest to the lower limit weight value, The combination lamp 5 is lit in green with respect to the weighing pan 2 constituting the selected weight value. In this case, in the actual combination selection operation, the number of selected dishes from the B group is not necessarily limited to three. Since the probability of establishment is low, there is no need to consider the creation of a selection table for determining the quality of workability in the previous stage of work. For example, the combination weight when the number of dishes selected from Group B is 2 is the lowest weight. When the values are close to each other, the combination may be determined as the optimum combination, and the combination lamp 5 may be lit in green for the weighing pan 2 constituting the selected weight value. That is, in order to create a selection table for determining the quality of workability, the number M of combinations of objects to be weighed is determined, and based on this, the number of selected dishes from the B group is defined. In some cases, it is not necessary to limit the number of combinations. In such a case, it is not necessary to put the number of combinations into the condition for establishing the combination operation. Therefore, the number of selected dishes from the group B is not necessarily limited to three. Also good.

  The operator can unload the objects to be weighed from the weighing pan 2 of the combination lamp that is lit in green to create a pack of five objects to be weighed. The combination lamp 5 of the weighing pan 2 on which the object to be weighed has been lowered is turned off, and the operator continues the operation by placing a predetermined number of objects to be weighed on the weighing pan 2 where the object to be weighed has been lowered.

  In accordance with the selection number C selected in this way, the operator loads and unloads the object to be weighed on the weighing pan 2, while the control unit 4 performs a combination operation according to the selection number C.

  Even during the operation of this combination weighing, the average weight value wa and standard deviation σ1 of all the objects weighed by the weighing pan 2 are obtained, and if the objects to be weighed reach a predetermined number or more, or When the operator designates, the average weight value Wa and standard deviation S (g) of the combination number M are automatically calculated based on the newly determined average weight value wa and standard deviation σ1 of the weighing object. And the index Qc related to the establishment of the above-described combination may be updated and displayed on the operation setting display unit 7.

  Alternatively, more directly, the M combination weights established during the operation are aggregated, the average weight value Wa and the standard deviation value σ = S (g) are obtained, and the index Qc relating to the establishment of the combination is updated. May be.

  Further, the average value Wa and the standard deviation value σ = S (g) of the combination weight obtained by the combination weighing operation operation are stored in the memory 10 as the operation result values and used at the start of the next operation to use the selection table. It may be created and the index Qc regarding the formation of the combination may be calculated.

  Thus, even during the operation of combination weighing, the index Qc related to the establishment of the optimal combination can be updated in the background. Therefore, the operator calls the updated index Qc to the operation setting display unit 7, The operating conditions for operation can be reviewed according to the current weight distribution.

(Other embodiments)
In the above-described embodiment, the color and size of the weighing pan are changed so that the weighing pan of each group can be identified. However, a group identification lamp or the like is installed near the weighing pan so that the weighing pan can be identified. Also good.

  In the embodiment described above, the number of groups is two, but three or more groups may be used.

  In the selection table described above, how to place the objects to be weighed with the same number of weighing pans in each group may be displayed together.

  In the above-described embodiment, the selection information is displayed as a table. However, the selection information is not limited to the table, and may be displayed using, for example, a diagram schematically showing a weighing pan.

  The present invention is useful as a manual combination scale.

DESCRIPTION OF SYMBOLS 1 Combination scale 2 Weighing pan 4 Control unit 5 Combination lamp 7 Operation setting display part 9 Arithmetic control part 10 Memory 11 Load sensor 12 Weighing part

Claims (6)

The objects to be weighed are placed on the weighing units selected as the optimum combination by manually placing the objects to be weighed on multiple weighing units, performing combination calculation based on the weight value of the weighing objects of each weighing unit Is a combination scale that is manually unloaded,
Setting means for setting setting information substantially including the number of combinations of the objects to be weighed;
A combination calculation means for performing the combination calculation based on a weight value of the object to be weighed in each weighing unit and selecting the optimum combination having a combination weight value within an allowable weight range;
Selection information output means for outputting selection information based on the setting information,
When the selection information output means divides the plurality of weighing units into a plurality of groups in which the number of objects to be weighed placed on each weighing unit is different for each group, And selection information including a selectable combination of the selected number of weighing units for each group selected to be the number of combinations,
The combination calculation means is capable of performing the combination calculation according to the selected number of weighing units for each group.
A combination weigher characterized by that. The selection information output means includes the number of the weighing units for each group, the above-mentioned number of units for each group, and the selected number of the weighing units for each group selected to be the number of combinations. Outputting the selection information including selectable combinations;
The combination weigher according to claim 1. The setting information includes the number of weighing units used for weighing the object to be weighed among the plurality of weighing units,
The selection information output means divides a plurality of measuring units to be used into the plurality of groups and outputs the selection information for each divided group.
The combination weigher according to claim 1 or 2. The selection information output means calculates the number of selectable combinations of measuring units based on the number of measuring units for each group and the selected number of measuring units for each group, and the combination of calculated measuring units Output as the selection information,
The combination weigher according to any one of claims 1 to 3. The setting information includes weight data of the object to be weighed, and the selection information output means is the combination weight value that falls within the allowable weight range based on the weight data of the object to be weighed that is normally distributed. Calculating the probability of existence, and outputting the calculated probability as the selection information.
The combination weigher according to claim 1. The selection information output means is a combination establishment index relating to the establishment of the optimal combination based on the number of combinations of the weighing units that can be selected and the probability that the combination weight value is within the allowable weight range. And outputs the calculated combination establishment index as the selection information.
The combination weigher according to claim 5.

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