WO2014064735A1

WO2014064735A1 - Weight sorting machine, and weighing, packaging, and inspection system

Info

Publication number: WO2014064735A1
Application number: PCT/JP2012/006820
Authority: WO
Inventors: 川西　勝三; 洋一郎香川
Original assignee: 大和製衡株式会社
Priority date: 2012-10-24
Filing date: 2012-10-24
Publication date: 2014-05-01

Abstract

A weight sorting machine for using a packaging machine to package an object to be weighed which has been discharged from a combination scale, and weighing and sorting packaged products from the packaging machine, wherein the combination scale is caused to temporarily modify a target combination weight to a provisional target combination weight so that a packaged product sorted as a proper-weight product corresponds to an average system, i.e., so that the average weight of the packaged product sorted as a proper-weight product becomes a nominal weight or greater while packaged products having a weight that is less than a nominal weight are allowed to be included among packaged products sorted as a proper-weight product.

Description

Weight sorter and weighing and packaging inspection system

The present invention relates to a combination weigher that weighs and discharges an object to be weighed such as confectionery, a packaging machine that packages the object to be weighed discharged from the combination weigher, and an inspection and selection of the weight of the packaged product from the packaging machine The present invention relates to a weighing and packaging inspection system including a weight sorter, and a weight sorter used therefor.

Conventionally, an object to be weighed with a combination weigher is typically put into a packaging machine and packaged, for example.

Such a combination weigher has a plurality of weighing hoppers for weighing the objects to be supplied, and various combinations of the weight values of the objects to be weighed by the plurality of weighing hoppers are combined to give a total weight. Perform a combination calculation that selects a combination with an allowable weight range that is equal to or greater than the target combination weight, discharge the object to be weighed from the weighing hopper of the combination selected in the combination operation, and place the discharged object under the combination scale. It is put into the arranged packaging machine and packaged.

If the combination weight of the objects to be weighed discharged from the combination weigher is within the allowable weight range above the target combination weight and no packaging failure occurs in the packaging machine, weigh the packaged product from the packaging machine. There is no need to provide a weight sorter for sorting.

However, due to the zero point fluctuation of the weighing hopper of the combination weigher or the formation of adhesion of the object to be weighed easily, the combination weight of the object to be weighed selected in the combination calculation and the object actually discharged from the combination weigher The weight of the sample may be different. For this reason, a weight sorter is installed after the packaging machine, the weight of the packaged product from the packaging machine is measured, and the weight of the packaged product is, for example, an “appropriate amount product” within the allowable weight range, less than the allowable weight range. It is discriminated whether it is either “insufficient” or “overweight” exceeding the allowable weight range, and “insufficient” and “overweight” outside the allowable weight range are excluded by the sorting device. .

In the present specification, “weight of packaged product” means the weight of the contents of the packaged product. The weight of the contents of the packaged product is displayed on the label of the packaged product as a so-called nominal weight.

By the way, in European countries and regions, when producing a packaged product, if the average weight of the packaged product for the produced lot is greater than the nominal weight, the packaged product will fall below the nominal weight in some of the produced lots. The so-called average system, which may contain products, is adopted so that the price of the packaged product itself is appropriate, and ultimately the benefit of the consumer is achieved.

In this average system, when lots of packaged goods are produced, the average weight of the packaged goods in any lot (the total weight of a large number of packaged goods constituting the lot is expressed as the number of packaged goods. If the divided value) is equal to or greater than the nominal weight of the packaged product, it may be included if the packaged product in a predetermined weight range less than the nominal weight is equal to or less than a predetermined ratio.

In such an average system, at the start of production of a packaged product, a packaged product exceeding the nominal weight is produced so that the total average weight of the produced packaged product exceeds the nominal weight. In the range where the overall average weight does not become less than the nominal weight, a packaged product in a specified weight range that is lower than the nominal weight is produced so as to be a predetermined ratio or less. Accordingly, a packaged product having a nominal weight or more or less than the nominal weight is produced.

The applicant of the present application has already proposed a combination weigher that can cope with such an average system (see Patent Document 1).

JP-A-61-137020

In combination weighers that can support the above average system, at the start of production of a packaged product, the target combination weight is set as the nominal weight of the packaged product, and a combination of objects to be weighed that exceeds the nominal weight is selected and discharged to the packaging machine. Therefore, at the start of production of the package, the overall average weight of the package should be greater than the nominal weight. In addition, the target combination weight is set to a weight less than the nominal weight, and the combination of objects to be weighed that is less than the nominal weight is selected and packaged so that the packaged product in the predetermined weight range that is less than the nominal weight is less than the predetermined ratio. The combination calculation is performed with the target combination weight as the nominal weight or a weight less than the nominal weight according to the change in the average weight of the produced packaged product. That.

Thus, in the combination weigher corresponding to the average system, the combination calculation is performed with the target combination weight as the nominal weight or the weight less than the nominal weight in a range where the total average weight of the package does not become less than the nominal weight. A combination of objects to be weighed exceeding the nominal weight or a combination of objects to be weighed less than the nominal weight is discharged.

Weighing and packaging inspection system by combination weigher corresponding to this average system, packaging machine for packaging the objects to be weighed from this combination weigher, and weight sorter for inspecting and sorting the weight of the packaged goods from the packaging machine When configured, there are the following problems.

In other words, when the combination weigher selects a combination of objects to be weighed within the allowable upper limit above the nominal weight by the combination calculation and discharges it to the packaging machine, the weighing hopper of the combination weigher Due to the zero point fluctuation or the like, the combined weight of the objects to be weighed discharged to the packaging machine may actually exceed the allowable upper limit value. A combination of objects to be weighed exceeding this allowable upper limit value is removed from the production line as an “overweight product” by the weight sorter after being packaged by the packaging machine.

However, with a combination weigher, weighed objects that have been excluded as “overweighted items” by the weight sorter are still weighed within the allowable upper limit above the nominal weight, and continue to be weighed for the average system. Therefore, there is a case where an object to be weighed less than the nominal weight is selected and discharged, and the object to be weighed less than the nominal weight is packaged by a packaging machine and sorted as a “suitable product” by a weight sorter.

In this case, when looking at the packaged product selected as a “suitable product” by the weight sorter, it is determined that the combination weighs in accordance with the average system and is an object to be weighed within the allowable upper limit above the nominal weight. Packaged items are not included, but packages of items to be weighed that are less than the nominal weight are included. The combination weigher is weighed so as to be compatible with the average system, including packages that are judged to be weighed items within the allowable upper limit above the nominal weight. The packaged product is not compatible with the average system, and the average weight may be less than the nominal weight.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a weighing and packaging inspection system capable of supporting an average system and a weight sorter used therefor.

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

(1) The combination weigher of the present invention is a weight sorter that wraps the objects to be weighed discharged from the combination weigher with a packaging machine, and weighs and sorts the packaged product from the packaging machine,
The packaged product selected as an appropriate amount product is allowed to contain a packaged product having a weight less than the nominal weight of the packaged product, and an average weight of the packaged product selected as the appropriate amount product is equal to or greater than the nominal weight. In this way, the combination weigher includes a target combination weight changing unit that temporarily changes the target combination weight to a temporary target combination weight.

According to the weight sorter of the present invention, the weight sorter allows an average weight of the packaged product while allowing the packaged product to be an appropriate amount product to include a packaged product having a weight less than the nominal weight of the packaged product. However, the combination weigher temporarily changes the target combination weight to a temporary target combination weight so that the weight exceeds the nominal weight. Even if a package with a weight of 1 mm is included, the average weight is equal to or greater than the nominal weight, and the average system can be supported.

Also, if the weighing object discharged from the combination weighing machine to the packaging machine is not actually within the allowable weight range due to the zero point fluctuation of the weighing hopper of the combination weighing machine, it corresponds to the weighing object. The packaged product is simply excluded as not being an appropriate amount product by the weight sorter, and does not affect the packaged product that is an appropriate amount product by the weight sorter.

(2) In a preferred embodiment of the present invention, the target combination weight is the nominal weight, and the target combination weight changing unit is configured to determine a weight of a packaged product to be selected as the proper amount product and the target combination weight of the combination weigher. Alternatively, the deviation from the temporary target combination weight is accumulated, and the target combination weight is temporarily changed to the temporary target combination weight less than the nominal weight for the combination weigher based on the accumulated deviation. Let

According to this embodiment, the combination of objects to be weighed that is less than the nominal weight when the weight of the package to be sorted as an appropriate quantity exceeds, for example, the nominal weight, which is the target combination weight, and the accumulated deviation increases. Therefore, the target combination weight can be temporarily changed to a provisional target combination weight less than the nominal weight, and conversely, the weight of the packaged product to be sorted as an appropriate amount is, for example, the target combination. If the accumulated deviation is less than the nominal weight, the combination of objects to be weighed that is less than the nominal weight cannot be selected, so the target combination weight remains the nominal weight, and the tentative target combination weight. You can avoid making changes to

(3) In a preferred embodiment of the present invention, a communication unit that communicates with the combination weigher is provided, and the target combination weight changing unit performs a combination calculation using the temporary target combination weight and the temporary target combination weight. The number of times data is transmitted to the combination scale via the communication unit.

According to this embodiment, the weight sorter transmits, to the combination weigher, the provisional target combination weight and the data of the number of times of combination calculation with the provisional target combination weight. The combination calculation in which the combination weight is changed to the temporary target combination weight can be performed over the designated number of calculations.

(4) In another embodiment of the present invention, the target combination weight changing unit is less than a first allowable value lower than the nominal weight in the packaged product selected as the appropriate amount product, and the first The packaged product having a weight that is less than a second allowable value and less than a predetermined rate, and the packaged product having a weight less than the second allowable value is less than a predetermined ratio. The target combination weight is temporarily changed to the temporary target combination weight so as not to be included.

The first and second permissible values and the predetermined ratio are preferably values and ratios stipulated by the average system employed in European countries and regions.

According to this embodiment, the packaged product that has been made into an appropriate amount by the weight sorter can satisfy the values and ratios defined in the average system.

(5) The weighing and packaging inspection system of the present invention comprises a combination weigher that selects and discharges a combination of objects to be weighed that is equal to or greater than a target combination weight, and a package that combines the objects to be weighed discharged from the combination weigher. A weighing and packaging inspection system comprising: a packaging machine that discharges a packaged product; and a weight sorter that measures and sorts the packaged product discharged from the packaging machine,
The weight sorter allows an average weight of the packaged product to be sorted as the proper quantity product while allowing the packaged product to be sorted as the proper quantity product to include a packaged product having a weight less than the nominal weight of the packaged product. A target combination weight changing unit that temporarily changes the target combination weight to a temporary target combination weight for the combination weigher so as to be equal to or more than the nominal weight.

According to the weighing and packaging inspection system of the present invention, the weight sorter allows an average amount of the packaged products while allowing a packaged product to be an appropriate amount product to include a packaged product having a weight less than the nominal weight of the packaged product. Since the target combination weight is temporarily changed to a temporary target combination weight so that the weight becomes equal to or greater than the nominal weight, the packaged product that has been made an appropriate amount by the weight sorter is the nominal weight. Even if a package with a weight less than that is included, the average weight is equal to or greater than the nominal weight, and can be used in an average system.

According to the present invention, the weight sorter allows the packaged product to be an appropriate amount product to include a packaged product having a weight less than the nominal weight of the packaged product, and the average weight of the packaged product is The combination weigher temporarily changes the target combination weight to the temporary target combination weight so that it exceeds the nominal weight. Even if products are included, the average weight exceeds the nominal weight, and can be used in the average system.

In addition, if the combination of objects to be weighed discharged from the combination weigher to the packaging machine is not actually within the allowable weight range due to the zero point fluctuation of the weighing hopper of the combination weigher, the object to be weighed The package corresponding to the combination is merely excluded as not being an appropriate amount by the weight sorter, and does not have any influence on the package that is an appropriate amount by the weight sorter.

FIG. 1 is a schematic diagram of a weighing and packaging inspection system according to an embodiment of the present invention. FIG. 2 is a block diagram of the weighing and packaging inspection system of FIG. FIG. 3 is a diagram showing an example of a weight distribution for explaining the outline of the average system. 4A is a flowchart for explaining the operation of the weight sorter of the weighing and packaging inspection system of FIG. FIG. 4B is a flowchart subsequent to FIG. 4A. FIG. 5 is a flowchart for explaining the operation of the combination weigher of the weighing and packaging inspection system of FIG.

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

FIG. 1 is a schematic diagram showing a configuration of a weighing and packaging inspection system according to an embodiment of the present invention.

The weighing and packaging inspection system of this embodiment includes a combination weigher 1 that weighs and discharges an object to be weighed, a packaging machine 2 that packages an object to be weighed discharged from the combination weigher 1, and a packaging machine 2 that is packaged. And a weight sorter 3 for weighing and sorting a packaged product (not shown).

In the combination weigher 1, a center base (body) 9 is supported at the center of the apparatus by, for example, four frames (not shown). A conical dispersion feeder 10 is provided above the center base 9 to disperse the objects to be weighed supplied from an external supply device (not shown) radially by vibration. Around the dispersion feeder 10, linear feeders 5 are provided for feeding an object to be weighed conveyed from the dispersion feeder 10 to each supply hopper 4 by vibration. Below the linear feeder 5, a plurality of supply hoppers 4 and weighing hoppers 6 are provided corresponding to each other, and are arranged around the center base body 9 along the circumference.

The dispersion feeder 10, the linear feeder 5, the supply hopper 4 and the weighing hopper 6 are attached to the center base 9, and the drive units thereof, that is, the vibration devices of the dispersion feeder 10 and the linear feeder 5, or the supply are provided in the center base 9. The gate opening / closing devices of the hopper 4 and the weighing hopper 6 are accommodated. Each weighing hopper 6 is attached with a load sensor 7 such as a load cell for measuring the weight of an object to be weighed in the weighing hopper 6, and the load sensor 7 is also housed in the center base 9 together with the drive unit. A collecting chute 8 having a substantially inverted truncated cone shape is disposed below the plurality of weighing hoppers 6.

Below the combination weigher 1, the wrapping machine 2 is disposed. The wrapping machine 2 wraps the objects to be weighed discharged from the collecting chute 8 in the same manner as in the past, for example, wraps the packaged goods. Is discharged.

The weight sorter 3 at the subsequent stage of the packaging machine 2 has a weighing conveyor 13 for weighing the packaged goods conveyed from the packaging machine 2 by the conveying

conveyors

11 and 12, and the weight of the packaged goods weighed by the weighing conveyor 13. Is not within the allowable weight range, and is conveyed to a sorting device (not shown) via the conveyor 14 and the packaged product that is not within the allowable weight range is “insufficient” or “overweight” ”Is excluded from the production line, and the packaged product within the allowable weight range is sent to the subsequent stage as an“ appropriate amount product ”.

FIG. 2 is a block diagram of the weighing and packaging inspection system of this embodiment.

The combination weigher 1 includes a weighing unit 1a including the weighing hopper 6 and the load sensor 7 described above, an operation setting display unit 1b for performing various settings and displays such as a nominal weight and an allowable upper limit value as a target combination weight, and a combination An arithmetic control unit 1c that performs arithmetic operations and controls each unit, an interface unit 1d, and a communication unit 1e are provided.

The arithmetic control unit 1c is mainly composed of a microcomputer, and includes a CPU and a memory for storing various data and control programs necessary for the control operation of the CPU. The calculation control unit 1c performs a combination calculation based on the contents set by the operation setting display unit 1b and the weight of the weighing object weighed by the weighing unit 1a, and the combination of the weighing objects selected by the combination calculation. Is discharged to the packaging machine 2. Moreover, in this embodiment, the combination calculation which changed the target combination weight temporarily based on communication with the weight sorter 3 as described later is performed.

The interface unit 1d is an interface for exchanging a discharge command signal and a discharge completion signal between the calculation control unit 1c and the packaging control unit 2c on the packaging machine 2 side, and the communication unit 1e is a weight sorter 3 Communication is performed with the communication unit 3d.

The packaging machine 2 includes a packaging unit 2a, an operation setting display unit 2b, a packaging control unit 2c, and an interface unit 2d.

The packaging unit 2a is for packaging an object to be weighed and for discharging the packaged product to the weight sorter 3. The operation setting display unit 2b performs various operations and settings for the packaging operation and performs necessary display.

In addition, the packaging control unit 2c sends a package product discharge command signal and a package product discharge completion signal to the combination scale 1 via the interface unit 2d according to the contents set by the operation setting display unit 2b. Transmission / reception is performed to control the discharge or the like of the packaged product with respect to the packaging unit 2a.

The weight sorter 3 includes a weighing / sorting unit 3a, an operation setting display unit 3b, a control unit 3c, and a communication unit 3d.

The weighing / sorting unit 3a measures the packaged product from the packaging machine 2 and sorts the packaged product in response to the sorting command from the control unit 3c. The operation setting display unit 3b performs the weight sorting operation. In addition to performing various operations and settings for the above, a necessary display is performed.

The control unit 3c is mainly composed of a microcomputer, and includes a CPU and a memory for storing various data and control programs necessary for the control operation of the CPU, and performs control necessary for weight selection of the object to be weighed. At the same time, it has a function as a target combination weight changing unit 3e that communicates with the combination weigher 1 and temporarily changes the target combination weight. Note that the communication unit 3d communicates with the communication unit 1e of the combination weigher 1.

Here, prior to the description of the operation of this embodiment, the outline of the average system will be further described based on FIG.

In the average system, there are first to third rules.

The first rule is that the average weight Wa of the packaged product is equal to or greater than the nominal weight NW of the packaged product. The second rule is that the percentage of packages with the weight of the first zone Z1 that is less than the first tolerance T1 below the nominal weight and greater than or equal to the second tolerance T2 below the first tolerance T1. Is a predetermined ratio, for example, less than 2.5%. The third rule is that the weight of any package is not in the second zone Z2, which is less than the second tolerance T2.

The first and second tolerance values T1, T2 are:
T1 = Nominal weight (NW)-Allowable negative error (TNE: Tolerable Negative Error)
T2 = nominal weight (NW)-2 x allowable negative error (TNE)
It is.

For example, if the nominal weight of the packaged product is 100 g and the allowable negative error (T.N.E.) is 1 g, the first allowable value T1 is 99 g, and the second allowable value T2 is 98 g.

In this embodiment, in order to obtain a weighing and packaging inspection system compatible with the average system, the following is performed.

That is, the combination weigher 1 does not perform weighing corresponding to the average system, but basically performs the same combination calculation as the conventional one, that is, an object to be weighed within the allowable weight range that is equal to or more than the target combined weight and within the allowable upper limit value. The combination calculation for selecting the combination is performed, and the target combination weight is temporarily changed from the weight sorter 3 to the temporary target combination weight, and the number of times of the combination calculation based on the temporary target combination weight is designated. Is transmitted, the combination calculation in which the target combination weight is changed to the temporary target combination weight is performed a designated number of times. In this case, the allowable upper limit value is kept as it is only by changing the target combination weight to the temporary target combination weight.

In this combination weigher 1, when the combination calculation is performed with the nominal weight of the packaged product as the target combination weight, and data for changing to the temporary target combination weight is transmitted from the weight sorter 3, the target combination weight is obtained. The combination calculation is performed by temporarily changing the nominal weight to the temporary target combination weight.

The weight sorter 3 allows the average weight of the packaged product selected as the proper quantity product to be included in the packaged product selected as the proper quantity product while allowing the packaged product having a weight less than the nominal weight to be included. 3 and the weight of the first zone Z1 shown in FIG. 3 in the package selected as an appropriate amount is not more than a predetermined ratio, and the weight of the second zone Z2. The target combination weight is temporarily changed to a temporary target combination weight so that the combination weigher 1 is not included.

That is, in this embodiment, the weight sorter 3 temporarily sets the target combination weight for the combination weigher 1 so as to correspond to the average system based on the weight of the packaged product to be an appropriate amount. This is changed to a temporary target combination weight.

This temporary target combination weight is less than the nominal weight, and is the first tolerance value T1 (= NW−TNE) or the second tolerance value T2 (= NW−2 · TNE) shown in FIG. is there.

The weight sorter 3 accumulates the deviation between the weight of the packaged product that is an appropriate amount product and the target combination weight or the provisional target combination weight of the combination weigher, and the combination weigher 1 with respect to the combination weigher 1 according to the accumulated deviation. Then, data for temporarily changing the target combination weight to the temporary target combination weight is transmitted.

As shown in FIG. 1, a combination operation is performed by a combination weigher 1 to discharge a combination of objects to be weighed, and then packaged by a packaging machine 1 and transferred to a weighing conveyor 13 of a weight sorter 3 as a packaged product. There is a time lag before weighing, and a plurality of packages are transferred during that time. For this reason, the weight sorter 3 transmits data for temporarily changing the target combination weight to the temporary target combination weight to the combination weigher 1 and then packaging corresponding to the time lag. The number of products is counted by a first transfer counter, which will be described later, so that it can be determined whether or not the product is a packaged product corresponding to the object to be weighed selected by the combination calculation after changing to the temporary target combination weight. .

In addition, the number of combination calculations based on the provisional target combination weight is not limited to one as described later, but may be a plurality of times, and in the case of a plurality of times, a plurality of packaged products corresponding to the plurality of times. Is weighed by the weight sorter 3, and is counted by a second transfer counter, which will be described later, so that it can be determined whether or not these are a plurality of packaged products.

Next, the operation of the weight sorter 3 of this embodiment will be described based on the flowcharts of FIGS. 4A and 4B.

First, when the operation of the weighing and packaging inspection system starts, in step n1 of FIG. 4A, the memory of the accumulated deviation value is cleared, and in step n2, the first zone that stores the number of packages present in the first zone Z1. The number of Z1 memory is cleared and initialized. Note that the nominal weight NW of the packaged product, the weight of the packaging material, which is the weight of the packaging material, and the allowable negative error (TNE) that defines the first and second allowable values T1 and T2 are displayed in advance in the operation setting display. It is set from the unit 3b and stored in the memory in the control unit 3c.

In step n3, the packaged product is detected by an article detection sensor (not shown) made up of a photoelectric sensor or the like. This article detection sensor detects a packaged product that has been discharged from the packaging machine 2 and has reached a position at which the weight of the packaged product can be measured by the weighing conveyor 13 of the weight sorter 3.

In step n4, the weight of the package detected by the article detection sensor is measured by the weighing conveyor 13. In the combination weigher 1, simultaneously with the start of the operation, the combination calculation is performed with the nominal weight of the packaged product as the target combination weight, and the combination of the objects to be weighed selected in this combination calculation is packaged by the packaging machine 2, and the weight It is conveyed to the sorter 3 as a packaged product, and the weight sorter 3 measures the packaged product. Accordingly, at the start of operation, the combination weigher 1 selects a combination of objects to be weighed that is greater than the nominal weight and discharges it to the packaging machine 2, and the packaged product that is packaged by the packaging machine 2 and that is more than the nominal weight is the weight sorter 3. Will be transferred to.

In step n5, it is determined whether or not a temporary target combination weight change data transmission flag (hereinafter referred to as “change data transmission flag”) is ON (set).

Here, the change data transmission flag is a flag indicating that the combination weigher 1 has transmitted to the combination weigher 1 data for temporarily changing the target combination weight to the temporary target combination weight.

In step n5, when the change data transmission flag is not ON, that is, when data for temporarily changing the target combination weight to the temporary target combination weight is not transmitted to the combination weigher 1. The process proceeds to step n12 in FIG. 4B.

In step n12 of FIG. 4B, it is determined whether or not the measured value of the package measured in step n4 is an appropriate amount, that is, whether the measured value is within the allowable weight range.

Here, the allowable weight range will be described. The weight sorter 3 does not transmit data to the combination weigher 1 so that the target combination weight is changed to the temporary target combination weight. In the combination weigher 1, the nominal weight is set as the target combination weight. When the combination calculation is performed and the measured value of the packaged product corresponds to the object to be weighed selected by the combination calculation, the allowable weight range is the weight range up to the allowable upper limit value with the nominal weight as the lower limit value.

The weight sorter 3 transmits data to the combination weigher 1 so as to change the target combination weight to the provisional target combination weight. In the combination weigher 1, the combination calculation is performed with the provisional target combination weight. When the measured value of the packaged product corresponds to the object to be weighed selected by the combination calculation, the allowable weight range is a weight range up to the allowable upper limit value with the temporary target combination weight as the lower limit value.

In this embodiment, since the allowable upper limit value is not changed as described above, the nominal weight that is the target combination weight is changed to the first allowable value T1 or the second allowable value T2 that is the temporary target combination weight. In this case, the width of the allowable weight range is widened, and the combination is easily established by the combination calculation. As another embodiment of the present invention, the allowable upper limit value may be changed in accordance with the change of the target combination weight to make the width of the allowable weight range constant.

The combination calculation is performed with the provisional target combination weight, and whether or not the measurement value of the package corresponding to the object to be weighed selected by the combination calculation is the count value of the first and second transfer counters. Can be determined as described below.

In step n12, if it is determined that the measured value of the packaged product is an appropriate amount, the process proceeds to step n13. If it is determined that the packaged product is not an appropriate amount, the process proceeds to step n30.

In step n13, the deviation (= measured value of the packaged product−target combination weight (or provisional target combination weight) −wrapping material weight) is calculated, and the process proceeds to step n14.

As described above, the weight of the packaged product means the weight of the contents, and the weight of the packaging material, which is the weight of the packaging material, is subtracted from the measured value of the packaged product.

In addition, since the target combination weight is temporarily changed to the temporary target combination weight, the combination calculation is performed with the temporary target combination weight, and the package item corresponding to the weighing object selected by the combination calculation is measured. When the value is a value, the temporary target combination weight is subtracted from the measured value of the packaged item instead of the target combination weight which is the nominal weight. In step n14, the deviation calculated in step n13 is added to the accumulated deviation value, the accumulated deviation value is updated, and the process proceeds to step n15.

In step n15, it is determined whether or not the change data transmission flag is ON. When the change data transmission flag is not ON, that is, for the combination weigher 1, the target combination weight is set to a temporary target combination weight. When the data for changing temporarily is not transmitted, it transfers to step n16.

In step n16, it is determined whether or not the accumulated deviation value is at least twice the allowable minus error (TNE) that defines the second allowable value T2, and the accumulated error is twice the allowable minus error (TNE). If this is the case, the average weight of the packaged product will exceed the nominal weight even if a combination of objects to be weighed in the first zone Z1 is selected. Therefore, the number of packages in the first zone Z1 is determined by the average system. It is determined whether or not the number is less than a predetermined number corresponding to an allowable predetermined ratio (step n17).

When the number of the first zones Z1 is less than the predetermined number allowed, the combination of objects to be weighed as the first zone Z1 can be selected, so the number of the first zones Z1 is counted up, that is, incremented. (Step n18) For the combination weigher 1, the target combination weight is changed to the second allowable value T2 obtained by subtracting twice the allowable minus error (TNE) from the nominal weight, which is a temporary target combination weight. Then, data specifying the number of times of the combination calculation is transmitted (step n19), and the change data transmission flag is turned ON (step n20). Furthermore, after transmitting the temporary target combination weight and the number of times of the combination calculation to the combination scale 1, the combination calculation is performed with the temporary target combination weight, and the combination of the selected objects to be weighed is the packaging machine. The count number is set in the first transfer counter that counts the number of packaged articles corresponding to the time lag until the weight sorter 3 is packaged in step 2 and returns to step n3 (step n21).

In step n17, when the number of first zones Z1 is not less than the predetermined number, that is, when the number is equal to or larger than the predetermined number, the cumulative deviation value is not less than twice the allowable minus error (TNE). Since the combination of objects to be weighed in the first zone Z1 cannot be selected, the process proceeds to step n22.

In step n22, in order to know how many times a combination of objects to be weighed that is equal to or greater than the first allowable value T1 obtained by subtracting the allowable negative error (TNE) from the nominal weight, the cumulative deviation value can be selected. Is divided by the allowable minus error (TNE), and the integer part n of the quotient is set as the number of combination calculations designated for the combination weigher 1, and the process proceeds to step n23.

In step n23, the target combination weight of the combination weigher 1 is changed to the first allowable value T1 obtained by subtracting the allowable negative error (TNE) from the nominal weight, which is a temporary target combination weight, and the combination calculation is performed. Data specifying the number of times n is transmitted, and the change data transmission flag is turned ON (step n24).

Further, after the provisional target combination weight and the number of times of the combination calculation are transmitted to the combination weigher 1, the combination calculation is performed with the provisional target combination weight, and the combination of the objects to be weighed is selected by the packaging machine 2. Sets the count number to the first transfer counter that counts the number of packaged products corresponding to the time lag until it reaches the weight sorter 3 after being packaged, and corresponds to the number of combination calculations n based on the provisional target combination weight The count number to be set is set in the second transfer counter, and the process returns to step n3 (step n25).

In step n16, when the accumulated deviation value is not twice or more of the allowable minus error (TNE), the process proceeds to step n26, and it is determined whether or not the accumulated deviation value is not less than the allowable minus error (TNE). If it is not equal to or greater than the allowable minus error, the combination of the objects to be weighed less than the nominal weight cannot be selected.

In step n26, when the accumulated deviation value is greater than or equal to the allowable minus error (TNE), if the accumulated deviation value is equal to or greater than the first allowable value T1, a combination of objects to be weighed less than the nominal weight can be selected. Then, the target combination weight is changed to the first allowable value T1 obtained by subtracting the allowable minus error (TNE) from the nominal weight, which is a tentative target combination weight, and data specifying the number of times of the combination calculation is transmitted. (Step n27), the change data transmission flag is turned ON (Step n28). Furthermore, after transmitting the temporary target combination weight and the number of times of the combination calculation to the combination scale 1, the combination calculation is performed with the temporary target combination weight, and the combination of the selected objects to be weighed is the packaging machine. In step n29, the count number is set in the first transfer counter that counts the number of packaged products corresponding to the time lag until the weight sorter 3 is packed after being packed in step 2 (step n29).

Referring to FIG. 4A again, when the change data transmission flag is ON in step n5, the data for temporarily changing the target combination weight to the temporary target combination weight for the combination weigher 1 already. Is transmitted, the first transfer counter is decremented, that is, decremented (step n6), and it is determined whether or not the first transfer counter has become “0” (step n7). The fact that the first transfer counter has reached “0” means that the weighed packaged product is a packaged product corresponding to the object to be weighed selected by the combination calculation with the changed temporary target combination weight. . When the first transfer counter is not “0”, the process proceeds to step n12 in FIG. 4B.

In Step n7, when the first transfer counter is “0”, it is determined whether or not the second transfer counter that counts the number of combination calculations based on the temporary target combination weight is “0” (Step n8). As shown in steps n21 and 29 of FIG. 4B described above, when the number of combination calculations is one, the count number is not set in the second transfer counter and remains “0”, which is shown in step 25. Thus, when the number of combination operations is n, the corresponding count number is set.

In step n8, when the number of combination calculations based on the tentative target combination weight is one and the second transfer counter is “0”, it is determined that the combination calculation based on the tentative target combination weight has ended, and the change data transmission flag Is turned OFF and the process proceeds to step n12 in FIG. 4B (step n9).

In step n8, when the second transfer counter is not “0”, the second transfer counter is subtracted (step n10), and it is determined whether or not the second transfer counter has become “0” (step n11). When the second transfer counter is not “0”, the process proceeds to step n12 in FIG. 4B. When the second transfer counter reaches “0”, the change data transmission flag is turned off and the process proceeds to step n12 in FIG. 4B (step n9), assuming that the n combination calculations based on the temporary target combination weight have been completed.

As described above, the weight sorter 3 changes the target combination weight from the nominal weight to the first allowable value T1 or the second target combination weight from the nominal weight according to the change in the accumulated deviation value. Is temporarily changed to the allowable value T2.

On the other hand, in the combination weigher 1, based on the data transmitted from the weight sorter 3 as described above, combination calculation and the like are performed as shown in the flowchart of FIG.

First, in step n30 of FIG. 5, the combination weigher 1 executes the combination weigher control program and proceeds to step n31.

In step n31, it is determined whether a target combination weight temporary change flag (hereinafter referred to as “temporary change flag”) is ON. The fact that the temporarily changing flag is ON indicates that the target combination weight is temporarily changed to the temporary target combination weight in the combination weigher 1 based on the data from the weight sorter 3. ing.

When the temporarily changing flag is not ON, it is determined whether or not there is communication from the weight sorter 3 (step n32). When there is no communication, the process proceeds to step n34, and the combination calculation is performed using the nominal weight as the target combination weight. In other words, the combination calculation is performed without changing the target combination weight.

In step n32, when there is communication from the weight sorter 3, it is determined whether or not the provisional target combination weight and the number of combination calculations have been received (step n33). If not received, the process proceeds to step n34. When the combination calculation is performed and received, the process proceeds to step n35.

In step n35, since the temporary target combination weight and the number of times of the combination calculation are received from the weight sorter 3, the temporarily changing flag is turned ON, the number of combination calculations is set in the counter (step n36), and the target combination weight is set. Then, the received temporary target combination weight is changed (step n37), the combination calculation is performed with the changed temporary target combination weight (step n38), the counter of the combination calculation number is subtracted (step n39), It is determined whether or not the counter has become “0” (step n40), and when it is not “0”, the process returns to step n30. When the combination calculation counter reaches “0”, the combination calculation based on the temporary target combination weight is completed, so that the temporarily changing flag is turned OFF and the process returns to step n30 (step n41).

In step n31, when the temporarily changing flag is ON, the process proceeds to step n38, and a combination calculation based on the temporary target combination weight is performed.

As described above, according to the present embodiment, the weight sorter 3 allows the packaging product to be an appropriate amount product to be packaged while allowing a packaging product having a weight less than the nominal weight of the packaging product to be included. Since the target combination weight is temporarily changed to the provisional target combination weight so that the average weight of the product is equal to or greater than the nominal weight, the packaged product that has been made an appropriate amount by the weight sorter is Even if a package having a weight less than the nominal weight is included, the average weight is equal to or greater than the nominal weight, and the average system can be supported.

Thereby, for example, the combination of the objects to be weighed discharged from the combination weigher 1 as an appropriate quantity product due to, for example, the zero point fluctuation of the weighing hopper of the combination weigher 1 is not actually an appropriate quantity product. The average weight of a packaged product that has been made an appropriate amount by the weight sorter 3 is not less than the nominal weight.

Further, in the present embodiment, the combination weigher 1 only changes the nominal weight, which is the target combination weight, to the first allowable value T1 or the second allowable value T2, which is the temporary target combination weight, Since the allowable upper limit value is not changed, the allowable weight range that can be selected by the combination calculation is widened when the temporary target combination weight is changed, whereby the combination is easily established.

1 Combination Weigher 2 Packaging Machine 3 Weight Sorter 3e Target Combination Weight Change Section

Claims

A weight sorter for packaging an object to be weighed discharged from a combination weigher with a packaging machine, and weighing and sorting the packaged goods from the packaging machine,
The packaged product selected as an appropriate amount product is allowed to contain a packaged product having a weight less than the nominal weight of the packaged product, and an average weight of the packaged product selected as the appropriate amount product is equal to or greater than the nominal weight. The target combination weight changing unit that temporarily changes the target combination weight to a temporary target combination weight for the combination weigher,
A weight sorter characterized by that.
The target combination weight is the nominal weight;
The target combination weight changing unit accumulates a deviation between a weight of a packaged product to be selected as the appropriate quantity product and the target combination weight or the temporary target combination weight of the combination scale, and based on the accumulated deviation, the combination Causing the scale to temporarily change the target combination weight to the temporary target combination weight less than the nominal weight;
The weight sorter according to claim 1.
A communication unit communicating with the combination weigher;
The target combination weight changing unit transmits the temporary target combination weight and the data of the number of times of performing the combination calculation with the temporary target combination weight to the combination weigher via the communication unit.
The weight sorter according to claim 1 or 2.
The target combination weight changing unit is less than a first allowable value lower than the nominal weight and equal to or higher than a second allowable value lower than the first allowable value in the packaged product selected as the appropriate amount product. The target combination weight is set so that a ratio of the packaged product with a weight of less than a predetermined ratio is included and the packaged product with a weight of less than the second allowable value is not included. Temporarily change to the temporary target combination weight,
The weight sorter according to any one of claims 1 to 3.
A combination weigher that selects and discharges a combination of objects to be weighed that exceeds the target combination weight;
A packaging machine for packaging the combination of the objects to be weighed discharged from the combination weigher and discharging a packaged product;
A weighing and packaging inspection system comprising a weight sorter for weighing and sorting packages discharged from the packaging machine,
The weight sorter allows an average weight of the packaged product to be sorted as the proper quantity product while allowing the packaged product to be sorted as the proper quantity product to include a packaged product having a weight less than the nominal weight of the packaged product. A target combination weight changing unit that temporarily changes the target combination weight to a temporary target combination weight with respect to the combination weigher so as to be equal to or more than the nominal weight.
Weighing and packaging inspection system.