JP2012233740A - Combination weigher for mix weighing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable mix weighing for weighing plural mixed types of objects to be weighed and for accommodating to different mixture ratios without decrease in an operation rate.SOLUTION: Setting means sets plural target combination weights for at least one of plural types. The plural target combination weights are switched to perform combination calculation in operation. In the combination calculation, an object to be weighed of a type other than the type whose combination target weights are switched is used to such correction that a total combination weight obtained by summing up combination weights of the plural types of objects to be weighed becomes within a predetermined range.

Description

  The present invention relates to a combination weighing scale for performing so-called mix weighing, in which a plurality of objects to be weighed from different varieties are mixed and weighed so that the entire mixed volume becomes a predetermined amount.

  Conventionally, there is a combination weighing combination weigher that performs so-called mix weighing, in which a plurality of different types of objects to be weighed are mixed and weighed so that the total weight of the mixed products falls within a predetermined weight range (for example, see Patent Document 1). ).

  FIG. 7A is a schematic side view of such a conventional combination weighing scale. FIG. 7B is a schematic plan view of a weighing hopper and a collecting chute of the combination weighing scale.

  In the combination weighing combination weigher, for example, a single collective chute 21 is disposed below a plurality of weighing hoppers 20 arranged in a circle. For example, when two types of objects to be weighed are mixed and discharged, a plurality of weighing hoppers 20 are divided into groups G1 and G2 corresponding to each type, and each group of weighing hoppers 20 corresponds to each group. The kinds of objects to be weighed are supplied from the dispersion feeder 22 via the linear feeder 23 and the supply hopper 24. Then, the combination weighing of the objects to be weighed is performed for each group (for each type), and the total weight of all the types is combined and the combination weighing is performed, whereby the weighing hopper 20 to be discharged for each of all the types is measured. Find a combination. The objects to be weighed are discharged simultaneously from the weighing hopper 20 selected for this combination, and the discharged objects slide down the collecting chute 21 and are put into, for example, a packaging machine from the collecting chute outlet 21a. .

Japanese Patent Laid-Open No. 7-198466

  In general, an object to be weighed in which a plurality of varieties discharged from a combination weighing combination weigher are mixed is packaged by a packaging machine into a product. There are cases where it is desired to change the mixing ratio, which is the mixing ratio of the objects to be weighed for each product type.

  In such a case, in the conventional combination weighing combination weigher, it is necessary to temporarily stop the operation, change the setting to a program corresponding to the mixing ratio, and restart the operation, which causes a problem that the operation rate decreases. is there.

  In addition, for example, a product packaged by a packaging machine may be used as a small bag, and a predetermined number of the small bags may be packaged to form a large bag product. In such a case, there is a case where it is desired to produce a large bag product by mixing small bags having different mixing ratios.

  When producing small sachets with different mixing ratios using a single mixing and weighing combination weigher, the operation of the mixing and weighing combination weighers is stopped and mixed each time a sachet with a different mixing ratio is produced. The setting must be changed to a program corresponding to the ratio and the operation must be restarted, and the reduction of the operation rate becomes more remarkable.

  Accordingly, it is desirable to be able to produce sachets with different mixing ratios without stopping the operation of the combination weighing combination weigher.

  The present invention has been made in view of the above points, and in a mix measurement in which a plurality of kinds of objects to be weighed are mixed, mix measurement with different mixing ratios can be performed without reducing the operation rate. The purpose is to.

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

  (1) A combination weighing combination weigher according to the present invention is a combination weighing combination weigher that mixes and weighs a plurality of kinds of objects to be weighed, and is used for measuring at least one kind of objects to be weighed of the plurality of kinds. A setting means in which a plurality of target combination weights are set, and a combination calculation using a plurality of target combination weights set in the setting means as a target combination weight of the at least one product to be weighed during operation. A combination calculation means for performing a combination calculation by switching the plurality of target combination weights, and in the combination calculation, weighing of other types other than the at least one type is performed. Depending on the object, the total combination weight of the combination weights of the plurality of types of objects to be weighed is corrected to be within a predetermined weight range.

  According to the combination weighing combination weigher of the present invention, by setting a plurality of target combination weights in the setting means for at least one kind, during the operation, the plurality of target combination weights are switched to perform a combination calculation. In addition, a plurality of objects to be weighed with a mixing ratio corresponding to the target combination weight can be obtained in correspondence with each target combination weight. In addition, in the combination calculation, the total combination weight of the combination weights of a plurality of kinds of objects to be weighed by the objects to be weighed other than the kind whose target combination weight is to be switched is within a predetermined weight range. Since the correction is performed, the combined weights of the plurality of mix-weighed objects to be obtained are all within the predetermined weight range.

  Thus, the operation of the combination weighing combination weigher is temporarily stopped and the setting ratio is changed without changing the setting to a program having a different mixing ratio, that is, the operating ratio is not lowered, and the mixing ratio is different. A plurality of mix-weighed objects can be obtained.

  (2) In a preferred embodiment of the combination weighing combination weigher according to the present invention, a plurality of hoppers are provided for each type of the objects to be weighed, and temporarily hold and discharge the objects to be weighed. A combination means for discharging the objects to be weighed discharged from the hopper to a packaging machine, and a control means for controlling discharge of the plurality of hoppers based on the result of the combination calculation of the combination calculation means. The means selects a discharge combination that is a combination of hoppers to discharge the objects to be weighed by performing the combination calculation based on the weights of the objects to be weighed supplied to the plurality of hoppers. In the combination calculation performed by switching the target combination weight, the discharge combination having a mixing ratio corresponding to the target combination weight is selected, and the control unit selects the discharge group selected by the combination calculation unit. To discharge the objects to be weighed was the hopper.

  According to this embodiment, the combination calculation means, for each combination calculation performed by switching a plurality of target combination weights, the hopper of an object to be weighed in a mix ratio corresponding to the target combination weight, The control means can select a discharge combination that is a combination of hoppers to be discharged, and discharge the objects to be weighed in the hoppers of the discharge combination, and can put them into the packaging machine via the discharge means. In this case, an object to be weighed in the hopper of the discharge combination, that is, an object to be weighed that is mixed and weighed at a mixing ratio corresponding to the target combination weight within a predetermined weight range can be packaged into a product.

  (3) In another embodiment of the combination weighing combination weigher according to the present invention, the combination calculation means includes a plurality of the discharge combinations having different mixing ratios every time a combination calculation is performed by switching the plurality of target combination weights. The discharge means has a plurality of discharge paths corresponding to the plurality of discharge combinations, and the control means outputs the discharge selected by the combination calculation means. The objects to be weighed in the combination hopper are discharged to the discharge path corresponding to the discharge combination.

  According to this embodiment, each time a combination calculation is performed by switching a plurality of target combination weights, a discharge combination having a different mixing ratio is selected, and a corresponding discharge path is set for each selected discharge combination, that is, for each mixing ratio. Since the objects to be weighed can be fed to the packaging machine via the mixing machine, the weighed objects to be weighed can be discharged into the corresponding discharge route for each mixing ratio and then put into each packaging machine. Every time, the objects to be weighed can be packaged at different mixing ratios.

  (4) In still another embodiment of the combination weighing combination weigher of the present invention, the setting means includes a first target combination as a target combination weight of an object to be weighed of one of the plurality of varieties. A weight and a second target combination weight are set, and the combination calculation means converts the target combination weight of the one kind of object to be measured into the first target combination weight and the second target combination weight. A combination calculation is performed by alternately switching the first discharge combination obtained by combining the plurality of kinds of objects to be weighed at the first mixing ratio corresponding to the first target combination weight, and the second target combination weight. A second discharge combination obtained by combining the plurality of kinds of objects to be weighed is alternately selected at a corresponding second mixing ratio.

  According to this embodiment, the total combined weight is within a predetermined weight range, and an object to be weighed with a first mixing ratio and an object to be weighed with a second mixing ratio, Can be discharged alternately to the packaging machine, so that the packaging machine alternates between the product with the first mixture ratio packaged article and the product with the second mixture ratio packaged article. Can be produced.

  (5) The combination weighing combination weigher of the present invention is a combination weighing combination weigher that mixes and weighs a plurality of kinds of objects to be weighed, and is a combination weighing instrument for weighing at least one kind of the plurality of kinds of objects to be weighed. A setting means in which a plurality of target combination numbers are set, and a combination calculation is performed using a plurality of target combination numbers set in the setting means as a target combination number of the at least one product to be weighed during operation. A combination calculation means for performing the combination calculation by switching the plurality of target combination numbers. In the combination calculation, in the combination calculation, the to-be-measured of other kinds other than the at least one kind Depending on the item, the total number of combinations of the plurality of types of objects to be weighed is corrected so as to be within a predetermined number range.

  According to the combination weighing combination weigher of the present invention, by setting a plurality of target combination numbers in the setting means for at least one product type, during the operation, the plurality of target combination numbers are switched to perform a combination calculation. A plurality of objects to be weighed with a mixing ratio corresponding to the target combination number can be obtained in correspondence with each target combination number. In addition, in the combination calculation, the total number of combinations of the objects to be weighed from a plurality of varieties by the objects to be weighed other than the varieties whose target combination number is to be switched is within the predetermined number range. Since the correction is performed, the number of combinations of the plurality of mix-weighed objects to be obtained is within the predetermined number range.

  Thus, the operation of the combination weighing combination weigher is temporarily stopped and the setting ratio is changed without changing the setting to a program having a different mixing ratio, that is, the operating ratio is not decreased, and the mixing ratio is different. A plurality of mix-weighed objects can be obtained.

  In another embodiment of the present invention, a plurality of hoppers that are provided for each type of the objects to be weighed, temporarily hold and discharge the supplied objects to be weighed, and discharged from the plurality of hoppers. A discharge means for discharging the objects to be weighed to the packaging machine; and a control means for controlling discharge of the plurality of hoppers based on a combination calculation result of the combination calculation means. Based on the weight of the objects to be weighed supplied to the hopper, the combination calculation is performed to select a discharge combination that is a combination of hoppers to discharge the objects to be weighed, and the plurality of target combination numbers are switched. In the combination calculation to be performed, the discharge combination of the mixing ratio corresponding to the target combination number is selected, and the control means selects the weighing object of the hopper of the discharge combination selected by the combination calculation means. It may be allowed out.

  Further, in another embodiment of the present invention, the combination calculating means discharges any one of the plurality of discharge combinations having different mixing ratios each time a combination calculation is performed by switching the plurality of target combination numbers. A combination is selected, the discharge means has a plurality of discharge paths corresponding to the plurality of discharge combinations, and the control means is an object to be weighed in the hopper of the discharge combination selected by the combination calculation means. May be discharged to the discharge path corresponding to the discharge combination.

  Furthermore, in another embodiment of the present invention, the setting means includes a first target combination number and a second target combination number as a target combination number of an object to be weighed of one of the plurality of types. And the combination calculation means performs a combination calculation by alternately switching the target combination number of the one kind of objects to be weighed between the first target combination number and the second target combination number. A first discharge combination obtained by combining the plurality of kinds of objects to be weighed at a first mixing ratio corresponding to the first target combination number, and a second mixing ratio corresponding to the second target combination number. You may make it select alternately the 2nd discharge | emission combination which combined the said to-be-measured object of the said some kind.

  According to the present invention, the total combination weight or the number of combinations is within a predetermined range without temporarily stopping the operation of the combination weighing combination weigher and changing the setting to a program having a different mixing ratio, that is, without reducing the operating rate. It is possible to obtain a plurality of mix-weighed objects having different mixing ratios.

FIG. 1 is a diagram schematically illustrating a combination weighing combination weigher according to an embodiment of the present invention. FIG. 1A is a schematic diagram of a partial cross section of the mixing weighing combination weigher as viewed from the side. Fig. (B) is a schematic view of the two collecting chutes and the weighing hopper of the combination weighing combination weigher as viewed from above, and Fig. (C) is a schematic view of the dispersion feeder of the mixing weighing combination weigher as viewed from above. FIG. FIG. 2 is a diagram schematically showing the shape of the weighing hopper 5 of FIG. FIG. 3 is a flowchart for explaining the operation of the combination weighing combination weigher of FIG. FIG. 4 is a flowchart showing details of the combination calculation of FIG. FIG. 5 is a flowchart showing the discharge control by the discharge command signal. FIG. 6 is a diagram schematically showing a combination weighing combination weigher according to another embodiment of the present invention, and FIG. 6A is a schematic schematic view of a partial cross section of the mixing weighing combination weigher as viewed from the side. FIG. 4B is a schematic diagram of the collecting chute and the weighing hopper of the combination weighing combination weigher seen from above, and FIG. 4C is a schematic diagram of the dispersion feeder of the mixing metering combination weigher seen from above. It is. FIG. 7 is a diagram schematically showing a conventional combination weighing combination weigher. FIG. 7A is a schematic diagram of a partial cross section of the mixing weighing combination weigher seen from the side, and FIG. These are the schematic diagrams which looked at the gathering chute and the weighing hopper of the combination weigher for mixing and weighing from above.

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

(Embodiment 1)
FIG. 1 (a) is a schematic schematic view of a partial cross section of a combination weighing combination weigher according to an embodiment of the present invention as viewed from the side, and FIG. 1 (b) shows two sets of the combination weighing scale. FIG. 1C is a schematic diagram of the chute and the weighing hopper as viewed from above, and FIG. 1C is a schematic diagram of the dispersion feeder of the combination weigher as viewed from above.

  As shown in FIG. 1 (a), the combination weighing combination weigher of this embodiment (hereinafter, also simply referred to as “combination weigher”) is provided on the outside of a center substrate (body) 1 disposed in the center of the apparatus. There is provided a conical dispersion feeder 2 that disperses the object to be weighed supplied from the supply device (not shown) radially by vibration. Around the dispersion feeder 2, a plurality of linear feeders 4 are provided for feeding the objects to be weighed sent from the dispersion feeder 2 to each supply hopper 3 by vibration. Below each linear feeder 4, a supply hopper 3 and a weighing hopper 5 are provided correspondingly, and the plurality of supply hoppers 3 and the weighing hoppers 5 are arranged in a circle around the center base 1. The dispersion feeder 2, the linear feeder 4, the supply hopper 3 and the weighing hopper 5 are attached to the center base 1. Each weighing hopper 5 is attached with a weight sensor 6 such as a load cell that measures the weight of the object to be weighed in the weighing hopper 5, and the measured value by each weight sensor 6 is arranged in the center base 1. It is output to the control device 10.

  A substantially inverted conical inner chute 7 is disposed below the weighing hoppers 5 arranged in a circle, and an outer chute 8 having a concentric upper opening is disposed around the inner chute 7. Has been. Each chute 7 and 8 has a lower discharge port 7a and 8a, respectively. Each weighing hopper 5 has a configuration in which a gate is provided so as to selectively discharge an object to be measured to the inner chute 7 and the outer chute 8 below the weighing hopper 5. FIG. 2 is a diagram schematically showing the shape of each weighing hopper 5 close to the actual one. As shown in FIG. 2, each weighing hopper 5 has a gate for discharging an object to be measured to the inner chute 7. 5a and a gate 5b for discharging the object to be weighed to the outer chute 8 are provided.

  Below this combination weigher, for example, two packaging machines corresponding to the lower discharge ports 7a, 8a of the chutes 7, 8 are arranged, and through the two chutes 7, 8 constituting the discharge means. The discharged objects to be weighed are input to the respective packaging machines through different discharge paths, and are packed by the packaging machines.

  In this embodiment, as an example, when the two first and second varieties A and B to-be-measured are mixed and weighed and discharged to two packaging machines, a product of a small bag is produced by two packaging machines It applies to and explains. The items to be weighed for each variety to be mixed are not particularly limited, but are suitable for, for example, mix measurement of peanuts and rice cakes or candy of different varieties.

  Here, the weighing object of the first type A is supplied to the weighing hopper 5 of the first group G1 shown in FIG. 1 (b), and the weighing hopper 5 of the second group G2 is fed to the second hopper 5 of the second group G2. It is comprised so that the to-be-measured object of the kind B may be supplied. That is, as shown in FIG. 1 (c), a partition plate 9 is provided on the dispersion feeder 2 so as to prevent objects of different varieties A and B from being mixed, and the area on the dispersion feeder 2 is The partition plate 9 is divided into two first and second regions 2a and 2b. An object to be weighed of the first product type A is supplied to the first area 2a from an external supply device, and an object to be weighed of the second product type B is supplied to the second area 2b. The objects to be weighed of the first type A supplied to the first region 2a of the dispersion feeder 2 are supplied to the weighing hopper 5 of the first group G1 via the linear feeder 4 and the supply hopper 3. Similarly, the weighing object of the second type B supplied to the second region 2b of the dispersion feeder 2 is supplied to the weighing hopper 5 of the second group G2 via the linear feeder 4 and the supply hopper 3. .

  The control device 10 is constituted by, for example, a microcomputer, and controls the operation of the entire combination weigher by controlling the respective parts such as the feeders 2 and 4 and the hoppers 3 and 5. Further, the control device 10 has a function as a combination calculation means, and performs a combination calculation described later on the basis of the measured value from each weight sensor 6, thereby to each chute 7, 8 as the discharge means. Then, a discharge combination that is a combination of the weighing hoppers 5 to discharge the objects to be weighed is determined.

  The operation setting display unit 11 for performing various operation settings for the control device 10 is configured by using, for example, a touch panel and the like. In addition, the operation speed and the combination weighing value are displayed on the screen.

  In this embodiment, as described above, the two first and second varieties A and B of the objects to be weighed are mixed and weighed. It is to be weighed. That is, in this embodiment, the mix measurement is performed so that the first mixing ratio and the second mixing ratio are alternately set.

  Then, the object to be weighed with the first mixing ratio is discharged to the inner chute 7 constituting one discharge path, for example, and the object to be weighed with the second mixing ratio is the other object to be weighed. It discharges to the outer chute 8 constituting the discharge path, and is put into two packaging machines corresponding to each chute 7, 8, and by each packaging machine, a first mixing ratio sachet and a second mixing ratio sachet Are produced respectively.

  Thereafter, two types of sachets with different mixing ratios are packed together by a predetermined number so that the number of each type of sachet is the same, for example, to be a large bag product.

  Thus, in the combination weigher for mixing and weighing, in order to alternately load the objects to be weighed mixed at the first mixing ratio and the objects to be weighed mixed at the second mixing ratio into each packaging machine, In the operation setting display unit 11 as setting means, the following setting is performed before the operation is started.

  That is, in the operation setting display unit 11, for the first product type A, the target combination weight is set to the first target combination weight corresponding to the first mixing ratio and the second target combination corresponding to the second mixing ratio. Two are set with weight. For example, the first target combination weight Ta and the second target combination weight (Ta−α) are set as the target combination weight of the first type A. Here, α is preferably set to an integral multiple of the weight of the first kind A to-be-measured object, for example, a weight of 1 or a weight close thereto. As a result, the second target combination weight (Ta−α) corresponds to a weight, for example, that the number of the first type A is one less than the first target combination weight Ta. In the operation setting display unit 11, an allowable range for the target combination weight of the first product type A is set, and further, a target for the total of the combination weights of the objects to be weighed of the first and second product types A and B is added. The combination weight Tt and its allowable range are set.

  During operation, the control device 10 alternately switches the target combination weight of the first product type A between the first target combination weight Ta and the second target combination weight (Ta-α) and performs a combination calculation. First and second discharge combinations that are combinations of the weighing hoppers 5 to discharge the objects to be weighed are obtained. At this time, the difference in weight caused by the switching of the target combination weight is corrected by changing the target combination weight of the second product type B, and the combination weights of the objects to be weighed of the first and second product types A and B are corrected. The total combination weight is set to a predetermined weight range that is an allowable range of the target combination weight Tt for the whole.

  An example of a combination calculation for alternately switching the target combination weight of the first product type A will be described below.

  In this combination calculation, for example, first, the first discharge combination corresponding to the first mixing ratio in which the target combination weight of the first product type A is the first target combination weight Ta is selected.

  In the combination calculation for selecting the first discharge combination, the weights of the weighing objects of the weighing hoppers 5 of the first group G1 to which the weighing objects of the first type A are supplied are variously combined, and the combined weight The absolute value of the difference between the first target combination weight Ta and the first target combination weight Ta is the smallest, and the combination of the weighing hoppers 5 for the first type A within the allowable range of the target combination weight of the first type A is selected.

  Next, a weight obtained by subtracting the combination weight of the selected first type A objects to be weighed from the target combination weight Tt of the total of the combination weights of the objects to be weighed by both kinds A and B is obtained as a second value. The target combination weight of product type B The weights of the weighing objects of the weighing hopper 5 of the second group G2 to which the weighing objects of the second kind B are supplied are variously combined, and the combined weight and the target combination weight of the second kind B are combined. The combination of the weighing hoppers 5 is selected for the second type B that has the smallest absolute value of the difference between the two and the predetermined weight range that is the allowable range for the whole.

  Thus, the combination of the weighing hoppers 5 selected for each of the varieties A and B is the first discharge combination. The object to be weighed in the weighing hopper 5 of the first discharge combination is discharged to, for example, the inner chute 7 corresponding to the first discharge combination. As a result, the objects to be weighed in the first discharge combination in which the objects to be weighed in the first and second varieties A and B are mixed at the first mixing ratio are packed by one packaging machine corresponding to the inner chute 7. And a first mixing ratio sachet is produced.

  In the combination calculation after selecting the first discharge combination, the second discharge combination corresponding to the second mixing ratio in which the target combination weight of the first variety is the second target combination weight (Ta-α). Select.

  In the combination calculation for selecting the second discharge combination, the weights of the weighing objects of the weighing hoppers 5 of the first group G1 to which the weighing objects of the first type A are supplied are variously combined, and the combined weight And the second target combination weight (Ta-α), the absolute value of the difference is the smallest, and the combination of the weighing hopper 5 for the first type A that is within the allowable range of the target combination weight of the first type A select.

  Next, a weight obtained by subtracting the combination weight of the selected first type A objects to be weighed from the target combination weight Tt of the total of the combination weights of the objects to be weighed by both kinds A and B is obtained as a second value. The target combination weight of product type B Then, the weights of the weighing objects of the weighing hoppers 5 of the second group G2 to which the weighing objects of the second kind B are supplied are variously combined, and the combined weight and the target combination weight of the second kind B are The combination of the weighing hoppers 5 of the second product type B having the smallest absolute value of the difference and the predetermined weight range that is the allowable range for the whole is selected.

  The combination of the weighing hoppers 5 selected for each of the types A and B in this way becomes the second discharge combination. The object to be weighed in the weighing hopper 5 of the second discharge combination is discharged to the outer chute 8 corresponding to the second discharge combination. As a result, the weighing object of the second discharge combination in which the weighing objects of the first and second varieties A and B are mixed at the second mixing ratio is packed by the other packaging machine corresponding to the outer chute 8. A second mixing ratio sachet is produced.

  In this way, the first combination of objects to be weighed in which the objects to be weighed in the first and second varieties A and B are mixed at the first mixing ratio (the objects weighed and mixed at the first mixing ratio). Weighing object) and a second discharge combination weighing object in which the weighing objects of the first and second varieties A and B are mixed at the second mixing ratio (the weighing object which is mixed and weighed at the second mixing ratio). ) Are alternately discharged to the inner chute 7 and the outer chute 8, and each packaging machine alternately produces a first mixing ratio sachet and a second mixing ratio sachet. It will be.

  The above method of combination calculation shows an example, and the combination calculation for obtaining each discharge combination is not limited to the above, but other known combinations when a plurality of kinds of objects to be weighed are mixed and weighed An arithmetic method can be used.

  FIG. 3 is a flowchart for explaining the overall operation of the combination weighing combination weigher of this embodiment.

  First, the control device 10 controls the driving stop of the supply device that supplies the articles A and B of the products A and B to the dispersion feeder 2, and supplies the products A and B of the products A and B to the dispersion feeder 2. Supply device control for controlling the amount is performed (step s1).

  Next, dispersion feeder control is performed to control the drive of the dispersion feeder 2 to disperse the object to be measured to the surroundings and supply the object to the linear feeder 4 (step s2).

  Next, the linear feeder 4 is controlled by controlling the drive of the linear feeder 4 to vibrate the linear feeder 4 corresponding to the empty supply hopper 3 and supplying an object to be measured to the empty supply hopper 3 (step s3). .

  Next, the process proceeds to the supply hopper control in step s4. In this supply hopper control, the input gate of the supply hopper 3 corresponding to the empty weighing hopper 5 is opened, the object to be weighed is input to the empty measurement hopper 5, and the process proceeds to step s5.

  In step s 5, when an object to be weighed is inserted into the weighing hopper 5, the corresponding weight sensor 6 measures the weight of the object to be weighed into the weighing hopper 5 and takes the measured value into the control device 10. Perform weighing control.

  Next, the combination calculation is performed as described above on the basis of the weight of the objects to be weighed of the varieties A and B put in the weighing hoppers 5 of the groups G1 and G2, and the first discharge combination or the second discharge combination is performed. A discharge combination is selected (step s6).

  Thereafter, control is performed so as to select a discharge path corresponding to the mixing ratio in accordance with the input of a discharge command signal from each packaging machine (step s7), and the gate of the weighing hopper 5 is controlled to control the first discharge combination or Weighing hopper control is performed to discharge the objects to be weighed in the second discharge combination to the inner chute 7 or the outer chute 8 (step s8), and the process returns to step s1. Thereafter, by repeating the same weighing cycle as described above, the objects to be weighed in the first discharge combination or the second discharge combination are discharged to the corresponding packaging machines, respectively, and the first mixing ratio is set by each packaging machine. Sachets and sachets of the second mixing ratio are produced alternately.

  When the combination calculation is not established in step s6 and the first discharge combination or the second discharge combination cannot be obtained, for example, the object to be weighed from the predetermined weighing hopper 5 is packaged as in the conventional case. Force out of the machine.

  FIG. 4 is a flowchart showing details of the combination calculation processing in step s6 of FIG.

  First, it is determined whether or not the first combination instruction flag corresponding to the first mixing ratio in which the target combination weight of the first product type A is the first target combination weight Ta is turned on (step s601). When ON, the combination calculation is performed with the target combination weight of the first product A as the first target combination weight Ta (step s602). In this combination calculation, as described above, the weights of the objects to be weighed in the weighing hoppers 5 of the first group G1 to which the objects to be weighed of the first type A are supplied are variously combined, and the combined weight and the first weight are combined. The combination of the weighing hoppers 5 for the first type A that has the smallest absolute value of the difference from the target combination weight Ta and that is within the allowable range of the target combination weight of the first type A is selected.

  Next, the target combination weight of the second product type B is determined from the target combination weight Tt of the total of the combination weights of the objects to be weighed of both products A and B, and the target product weight of the first product type A selected in step s602. The weight is obtained by subtracting the combination weight of the weighing object, and the combination calculation is performed for the second product type B (step s603). In this combination calculation, as described above, the weights of the weighing objects of the weighing hoppers 5 of the second group G2 to which the weighing objects of the second type B are supplied are variously combined, and the combined weight and the second weight are combined. The combination of the weighing hoppers 5 is selected for the second type B having the smallest absolute value of the difference from the target combination weight of the type B and the predetermined weight range that is the allowable range for the whole.

  The weighing hopper 5 of the first group G1 to which the weighing object of the first kind A selected in step s602 is supplied, and the weighing object of the second kind B selected in step s603 are supplied. The combination of the weighing hoppers 5 combined with the weighing hoppers 5 of the second group G2 is the first discharge combination corresponding to the first mixing ratio.

  Next, the first combination instruction flag is turned off (step s604), the second combination instruction flag corresponding to the second mixing ratio is turned on, and the process ends (step s605).

  In step s601, when the first combination instruction flag is not turned on, it is determined whether or not the second combination instruction flag is turned on (step s606). The combination calculation is performed with the target combination weight as the second target combination weight (Ta-α) (step s607). In this combination calculation, as described above, the weights of the weighing objects of the weighing hoppers 5 of the first group G1 to which the weighing objects of the first type A are supplied are variously combined, and the combined weight and the second weight are combined. The absolute value of the difference from the target combination weight (Ta−α) is the smallest, and the combination of the weighing hoppers 5 for the first type A that is within the allowable range of the target combination weight of the first type A is selected.

  Next, the target combination weight of the second product type B is determined from the target combination weight Tt of the total of the combination weights of the objects to be weighed of both products A and B, and the target product weight of the first product type A selected in step s607. The weight is obtained by subtracting the combination weight of the weighing object, and the combination calculation is performed for the second product type B (step s608). In this combination calculation, as described above, the weights of the weighing objects of the weighing hoppers 5 of the second group G2 to which the weighing objects of the second type B are supplied are variously combined, and the combined weight and the second weight are combined. The combination of the weighing hoppers 5 is selected for the second type B having the smallest absolute value of the difference from the target combination weight of the type B and the predetermined weight range that is the allowable range for the whole.

  The weighing hopper 5 of the first group G1 to which the weighing object of the first type A selected in step s607 is supplied and the weighing object of the second type B selected in step s608 are supplied. The combination of the weighing hoppers 5 combined with the weighing hoppers 5 of the second group G2 is the second discharge combination corresponding to the second mixing ratio.

  Next, the second combination instruction flag is turned off (step s609), the first combination instruction flag corresponding to the first mixture ratio is turned on, and the process ends (step s610).

  As described above, in accordance with the first and second combination instructions, the first discharge combination object corresponding to the first mixing ratio or the second discharge combination corresponding to the second mixing ratio Select the objects to be weighed alternately.

  The object to be weighed selected in this way is discharged as shown in the flowchart of FIG.

  That is, it is determined whether or not a discharge command signal is input from the packaging machine corresponding to the inner chute 7 as the first discharge path (step s701). When the discharge command signal is input, the first mixing ratio is determined. The object to be weighed in the weighing hopper 5 of the first discharge combination corresponding to is discharged to the inner chute 7 and put into the corresponding packaging machine, and the process ends (step s702). In the packaging machine, an object to be weighed with a first mixing ratio is packaged to produce a small bag.

  In step s701, when no discharge command signal is input from the packaging machine corresponding to the first discharge path, it is determined whether or not a discharge command signal is input from the packaging machine corresponding to the outer chute 8 as the second discharge path. Judgment is made (step s703), and when a discharge command signal is inputted, the second discharge combination of the discharge combination corresponding to the second mixing ratio is discharged to the outer chute 8 and put into the corresponding packaging machine. (Step s704). In the packaging machine, the objects to be weighed in the second mixing ratio are packaged to produce sachets.

  As described above, it is not necessary to temporarily stop the operation of the combination weighing combination weigher and change the setting of the program, that is, without reducing the operation rate, the object to be weighed and mixed at the first mixing ratio The objects to be weighed and mixed at the second mixing ratio can be alternately put into each packaging machine to produce sachets with each mixing ratio alternately.

  As a result, when a large number of sachets with different mixing ratios are to be produced by collecting a predetermined number of sachets with different mixing ratios, it is possible to produce sachets with different mixing ratios produced alternately by each packaging machine. For example, after producing the required number of sachets of the first mixing ratio in advance, and then changing the setting of the program that temporarily stopped operation to produce the required number of sachets of the second mixing ratio, each mixing ratio Compared to the production of large bags by gathering small bags, it is possible to produce large bags efficiently.

(Embodiment 2)
In the above-described embodiment, the present invention is applied to the mix measurement of the objects to be weighed of the two types A and B, but the present invention can be similarly applied to the mix measurement of the objects to be weighed of three or more types.

  FIG. 6A is a schematic schematic view of a partial cross section of a combination weighing combination weigher according to another embodiment of the present invention viewed from the side, and FIG. 6B is a collective chute of the combination weighing scale. FIG. 6C is a schematic diagram of the dispersion feeder of the combination weigher seen from above, and the parts corresponding to FIG. 1 described above are the same. The description is abbreviate | omitted and attached | subjected.

  The combination weighing combination weigher of this embodiment is a mixture weighing of the three first to third varieties A, B, and C to be weighed. As shown in FIG. The arranged weighing hoppers 5 are grouped into first to third groups G1 to G3 for each of the types A, B, and C.

  As shown in FIG. 6C, the partition plate 12 has a region on the dispersion feeder 2 so that the objects to be weighed are supplied to the weighing hoppers 5 of the groups G1 to G3 for each type. Thus, the first to third regions 2a to 2c are partitioned, and the articles to be weighed of the varieties A to C are supplied to the first to third regions 2a to 2c, respectively.

  The objects to be weighed of the first type A supplied to the first region 2a of the dispersion feeder 2 are supplied to the weighing hopper 5 of the first group G1 via the linear feeder 4 and the supply hopper 3, and the dispersion feeder 2 The second type B object to be weighed supplied to the second area 2b of the second group G2 is supplied to the weighing hopper 5 of the second group G2 via the linear feeder 4 and the supply hopper 3, and the third feeder 3 of the dispersion feeder 2 is supplied. The object to be weighed of the third type C supplied to the area 2c is supplied to the weighing hopper 5 of the third group G3 via the linear feeder 4 and the supply hopper 3.

  Also in this embodiment, for the first product type A, the first target combination weight Ta and the second target combination weight (Ta-α) are set as the target combination weight. In addition, an allowable range for the target combination weight of the first type A is set. For the second product type B, a target combination weight and its allowable range are set. Further, a target combination weight Tt for the total of the combination weights of the objects to be weighed of the three varieties A to C and an allowable range thereof are set.

  Also in this embodiment, the first combination of the first mix A in which the target combination weight of the first variety A is the first target combination weight Ta and the target combination weight of the first variety A is the first combination weight Ta. A second discharge combination having a second mixing ratio that is a target combination weight (Ta-α) of 2 is alternately selected.

  In the combination operation for selecting the first discharge combination, the weights of the weighing objects of the weighing hoppers 5 of the first group G1 to which the weighing objects of the first type A are supplied are variously combined, The combination of the weighing hoppers 5 for the first type A that has the smallest absolute value of the difference from the first target combination weight Ta and that is within the allowable range of the target combination weight of the first type A is selected.

  Next, the target combination weight of the second type B is corrected so as to compensate for the difference between the first target combination weight Ta and the combination weight of the selected first type, and the second type B object to be weighed The weights of the objects to be weighed in the weighing hopper 5 of the second group G2 to be supplied are variously combined, and the absolute value of the difference between the combined weight and the corrected target combination weight of the second type B is the smallest. Then, the combination of the weighing hoppers 5 for the second type B that is within the allowable range of the target combination weight of the second type B is selected.

  Next, from the target combination weight Tt for the total of the combination weights of the three kinds A to C of the objects to be weighed, the combination weight of the selected objects of the first kind A and the selected second The weight obtained by subtracting the combined weight of the objects to be weighed for the type B is set as the target combined weight for the third type C. The weights of the objects to be weighed in the weighing hopper 5 of the third group G3 to which the objects to be weighed in the third kind B are supplied are variously combined, and the combined weight and the target combination weight of the third kind C are The combination of the weighing hoppers 5 is selected for the third product type C having the smallest absolute value of the difference and the predetermined weight range that is the allowable range for the whole.

  Thus, the combination of the weighing hoppers 5 selected for each of the varieties A to C is the first discharge combination. The objects to be weighed in the weighing hopper 5 of the first discharge combination are discharged to the single collecting chute 13. As a result, the first discharge combination objects to be weighed, in which the first to third varieties A to C objects to be weighed are mixed at the first mixing ratio, are supplied to the packaging machine via the discharge port 13 a of the collecting chute 13. And is packed by a packaging machine to produce a sachet having a first mixing ratio.

  In the combination calculation after selecting the first discharge combination, the second discharge combination having the second mixing ratio in which the target combination weight of the first variety A is the second target combination weight (T-α) is obtained. select.

  In the combination calculation for selecting the second discharge combination, the weights of the objects to be weighed in the weighing hoppers 5 of the first group G1 to which the objects to be weighed in the first kind A are supplied are variously combined, Select the combination of the weighing hopper 5 for the first type A that has the smallest absolute value of the difference from the second target combination weight (Ta-α) and is within the allowable range of the target combination weight of the first type A To do.

  Next, the target combination weight of the second type B is corrected so as to compensate for the difference between the second target combination weight (Ta-α) and the combination weight of the selected first type A, and the second type The weight of the weighing object of the weighing hopper 5 of the second group G2 to which the weighing object of B is supplied is variously combined, and the difference between the combined weight and the corrected target combination weight of the second product type B The combination of the weighing hoppers 5 for the second type B that has the smallest absolute value and is within the allowable range of the target combination weight of the second type B is selected.

  Next, from the target combination weight Tt for the total of the combination weights of the three kinds A to C of the objects to be weighed, the combination weight of the selected objects of the first kind A and the selected second The weight obtained by subtracting the combined weight of the objects to be weighed for the type B is set as the target combined weight for the third type C. The weights of the objects to be weighed in the weighing hopper 5 of the third group G3 to which the objects to be weighed in the third kind B are supplied are variously combined, and the combined weight and the target combination weight of the third kind C are The combination of the weighing hoppers 5 is selected for the third product type C having the smallest absolute value of the difference and the predetermined weight range that is the allowable range for the whole.

  The combination of the weighing hoppers 5 selected for each of the varieties A to C in this way becomes the second discharge combination. The objects to be weighed in the weighing hopper 5 of the second discharge combination are discharged to the single collecting chute 13. As a result, the weighing object of the second discharge combination in which the weighing objects of the first to third varieties A to C are mixed at the second mixing ratio is supplied to the packaging machine via the discharge port 13a of the collecting chute 13. And is packed by a packaging machine to produce a second mixed ratio sachet.

(Other embodiments)
(1) In each of the above-described embodiments, a plurality of target combination weights are set and switched for one type A. However, as another embodiment of the present invention, three or more types of objects to be weighed are used. In combination weighing to be combined, a plurality of target combination weights may be set and switched for two or more types. For example, in the mixed weighing in which the objects to be weighed of three types A, B, and C are combined, the first and second target combination weights are set for the types A and B, respectively, and the first target combination weight is set for the type A. Is selected as the second target combination weight for the product type A, and the discharge combination is set as the first target combination weight for the product type B. Next, the mixing combination is sequentially selected, such as selecting the discharge combination that becomes the second target combination weight for the product B, and selecting the discharge combination having the mixing ratio that becomes the first target combination weight for the product A again. You may make it select the discharge | emission combination from which a ratio differs.

  (2) In each of the above-described embodiments, the first and second target combination weights are alternately switched to perform the combination calculation. However, it is not always necessary to switch alternately to perform the combination calculation. The first target combination weight combination calculation is repeated a set number of times, then the second target combination weight combination calculation is repeated a set number of times, and the first target combination weight combination calculation is repeated a set number of times again. For example, the combination calculation of the same target combination weight may be repeated a predetermined number of times. This set number of times may be, for example, the number of sachets produced at a certain mixing ratio.

  (3) In each of the above-described embodiments, two target combination weights for one product type are set. Of course, three or more target combination weights may be set. The above target combination weights may be switched in order to perform the combination calculation, or the target combination weights may be switched in the set order to perform the combination calculation.

  (4) In each of the above-described embodiments, the combination weight has been described. However, the present invention is not limited to the combination weight and can be similarly applied to the number of combinations.

  For example, when the two first and second varieties A and B to be weighed are mixed and weighed, for the first varieties A, the first combination corresponding to the first mixing ratio is set as the target combination number. Two sets of the target combination number and the second target combination number corresponding to the second mixing ratio are set. In addition, an allowable number range for the target combination number of the first product type A is set, and a unit weight of an object to be weighed of the first product type A is set. Furthermore, the target combination number and the allowable number range for the total of the combination numbers of the objects to be weighed in both the first and second varieties A and B are set, and the object of the second kind to be weighed is set. Set the unit weight.

  The first kind A supplied to the weighing hopper 5 by dividing the weight of the object to be weighed in the weighing hopper 5 to which the object to be weighed in the first kind A is supplied by the unit weight of the first kind A. The number of is calculated. Similarly, the second weight supplied to the weighing hopper 5 by dividing the weight of the weighing object of the weighing hopper 5 to which the weighing object of the second breed B is supplied by the single weight of the second breed B. The number of varieties B is calculated.

  During operation, the combination calculation is performed by alternately switching the target combination number of the first product type A between the first target combination number and the second target combination number. At this time, the difference in the number caused by the switching of the target combination number is corrected by changing the target combination number of the second product type B, and the combination number of the objects to be weighed of both the first and second product types A and B is corrected. The total number of combinations may be within the allowable number range of the target number of combinations for the whole.

  In the combination weighing of the number, the target combination weight and the like may be set together, and the combination condition for the combination weight and the like may be used in addition to the combination condition for the number.

  The present invention is useful for mixing and weighing a plurality of different varieties of objects to be weighed, and is particularly useful when producing a large bag product in a small bag.

2 Dispersing feeder 3 Supply hopper 5 Weighing hopper 6 Weight sensor 7 Inner chute 8 Outer chute 10 Controller 11 Operation setting display section

Claims (5)

A combination weighing scale for mixing and weighing a plurality of kinds of objects to be weighed,
Setting means for setting a plurality of target combination weights of the objects to be weighed of at least one of the plurality of varieties,
A combination calculation means for performing a combination calculation using a plurality of target combination weights set in the setting means as a target combination weight of the at least one product to be weighed during operation;
The combination calculation means performs a combination calculation by switching the plurality of target combination weights, and in the combination calculation, the combination of the plurality of varieties is measured by an object to be weighed other than the at least one varieties. Correction is made so that the total combination weight of the combination weights of the objects to be weighed is within a predetermined weight range.
A combination weighing scale for mixing and weighing. A plurality of hoppers provided for each kind of the objects to be weighed, and temporarily holding and discharging the objects to be weighed,
Discharging means for discharging the objects to be weighed discharged from the plurality of hoppers to a packaging machine;
Control means for controlling discharge of the plurality of hoppers based on the result of the combination calculation of the combination calculation means;
The combination calculation means selects a discharge combination that is a combination of hoppers to discharge the objects to be weighed by performing the combination calculation based on the weights of the objects to be weighed supplied to the plurality of hoppers. In the combination calculation performed by switching the plurality of target combination weights, the discharge combination having a mixing ratio corresponding to the target combination weight is selected,
The control means discharges an object to be weighed in the hopper of the discharge combination selected by the combination calculation means.
The combination weighing scale according to claim 1. The combination calculation means selects one of the plurality of discharge combinations having different mixing ratios every time a combination calculation is performed by switching the plurality of target combination weights.
The discharge means has a plurality of discharge paths corresponding to the plurality of discharge combinations,
The control means causes the hopper to be weighed in the discharge combination selected by the combination calculation means to be discharged to the discharge path corresponding to the discharge combination.
The combination weighing scale according to claim 2. In the setting means, a first target combination weight and a second target combination weight are set as a target combination weight of an object to be weighed of one of the plurality of types.
The combination calculation means performs a combination calculation by alternately switching a target combination weight of the one kind of object to be weighed between the first target combination weight and the second target combination weight, A first discharge combination obtained by combining the plurality of kinds of objects to be weighed at a first mixing ratio corresponding to the target combination weight, and a plurality of kinds of the plurality of kinds at a second mixing ratio corresponding to the second target combination weight. Alternately selecting a second discharge combination combining the objects to be weighed;
The combination weighing scale according to claim 2 or 3. A combination weighing scale for mixing and weighing a plurality of kinds of objects to be weighed,
Setting means for setting a plurality of target combination numbers of the objects to be weighed of at least one of the plurality of varieties,
A combination calculation means for performing a combination calculation using a plurality of target combination numbers set in the setting means as a target combination number of the at least one product to be weighed during operation;
The combination calculation means performs a combination calculation by switching the plurality of target combination numbers, and in the combination calculation, the combination of the plurality of varieties is measured by an object to be weighed other than the at least one varieties. Correct so that the total number of combinations of the objects to be weighed is within the specified number range.
A combination weighing scale for mixing and weighing.

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