JPH0516736B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field of the Present Invention> The present invention is a method for collecting a plurality of articles such as confectionery, fruits, vegetables, etc., which have individual weight variations, into a substantially constant amount. This invention relates to a combination weighing device that is used when filling bags into bags.

<Prior Art> (Figs. 4 and 5) A combination weighing device is generally used to group together a plurality of objects to be weighed whose individual weights vary by a set weight or a predetermined number of objects.

In a combination weighing device, the optimal combination is selected for each weighing value of the objects to be weighed supplied from each feeder to multiple weighing hoppers, and the objects to be weighed in the selected weighing hoppers are discharged and combined into one. However, in order to efficiently select combinations, it is necessary to ensure that the amount of objects to be weighed by each feeder to each weighing hopper is always at a predetermined value (i.e., the value obtained by dividing the set weight or predetermined number of pieces by the target number of combined hoppers). ) must be very close to .

However, the feeding force of the feeder fluctuates greatly due to changes in temperature, humidity, and power supply voltage, and even if the feeding force is constant, the actual amount fed varies depending on the type of object to be weighed, etc. to differ greatly.

For this reason, a combination weighing device as shown in FIG. 4 has conventionally been used.

That is, in this combination weighing device, objects to be weighed corresponding to the value obtained by dividing the set weight by the target combination hopper number are fed to the plurality of weighing hoppers 2 ₁ to 2 _o , respectively, by the feeders 1 ₁ to 1 _o , Each weighing hopper 2 ₁
By the measuring instruments 3 ₁ to 3 _o provided every ~2 _o ,
The stored objects to be weighed are each weighed.

The outputs of the weighing instruments ₃₁ to _3o are input to the combination selection circuit 4, and the optimum combination is selected from among the combined weights calculated for all the different combinations, and the selected weight is loaded into the weighing hopper. The objects to be weighed are discharged and collected in a collection chute 5 or the like.

On the other hand, the weighing values from each of the weighing instruments 3 ₁ to 3 _o are determined when the object to be weighed is transferred from the feeder 1 ₁ to 1 _o to the weighing hopper 2 ₁ to 2 _o.
Each time the signal is supplied to the control circuits 6 1 to 6 o, the signal is output to the control circuits 6 ₁ to 6 _o .

Each of the control circuits 6 ₁ to 6 _o inputs a target predetermined weight, a measured value input for each feeding, and parameters for controlling the feeding force of the feeder (for example, values that determine the vibration amplitude and vibration time of the vibrator). Based on this, after a predetermined number of feedings, new feeding force parameters for the feeders 1 ₁ to 1 _o from the next feeding are calculated.

As a method of calculating this new feeding force parameter, for example, the ratio of the average feed weight Wa of the object to be weighed per time that has been fed a predetermined number of times to the target weight Wm,
The result obtained by multiplying the current feeding force parameter F _N , that is, (Wm/Wa) x Fn, is calculated as the new feeding force parameter F _N+1 , and this new feeding force parameter F _N+1 is So, feeder 1 ₁
~1 _o so that the supply amount approaches the target weight Wm,
The feeding forces of the feeders 1 ₁ to 1 _o from the next time onwards are individually controlled.

As a result, fluctuations in the supply amount due to temperature changes, etc. of the feeders ₁₁ to _1o are suppressed by the feeding power control of each control circuit ₆₁ to _6o , and each feeder is individually supplied extremely close to the target weight Wm. .

<Problems to be Solved by the Present Invention> However, in the feeder control as described above, abnormal conditions (hereinafter referred to as bridge conditions) such as the object to be weighed being temporarily caught in the feeder, etc. ) occurs, the average value Wa of the supply amount from the feeder temporarily becomes extremely small with respect to the target weight Wm, and the average value Wa of the supply amount
The feeding force parameter of the feeder from the next feeding calculated based on will become an extremely large value, and a large amount of objects to be weighed will be fed to the weighing hopper.

For this reason, the weighing hopper to which a large amount of objects to be weighed is supplied may not be able to be used for subsequent combination selection, resulting in poor combination accuracy and efficiency, or even if it is used for combination selection. There was a drawback that the amount supplied from the feeder varied greatly with respect to the target weight Wm.

Further, in the conventional averaging control based on the number of times of supply, there is a problem that the power supply control cannot follow significant fluctuations in the supply amount. For this reason, it is conceivable to perform averaging control every time the supply is made.
However, the feeding force parameter of the feeder and the actual supply amount are often not in a proportional relationship, as shown in Figure 5 for an example. Even when I get old,
It does not necessarily mean that the number of times it takes to stabilize the supply amount will be shortened.

For example, when the target weight is 100g, the feed rate of the feeder driven with the initial parameter F ₀ of 1 is 80g.
g, the next parameter F ₁ is
100/80=1.25, and if the feeder is driven with this parameter _F1 , the actual feed amount will be 120g. Furthermore, the next parameter F ₂ is 100×2/(80
+120)=1.

Therefore, the next supply will be 80g again,
Furthermore, the next parameter F ₃ is 100×3/(80+
120+80)=1.07, and the amount fed to the feeder based on this parameter is approximately 90g.

In this way, even though the parameters have been updated three times, only a supply amount of up to 90g can be obtained against the target of 100g. Furthermore, since the characteristics of this feeder vary greatly depending on temperature and the like, it has been extremely difficult to converge the feed amount to the target weight.

The present invention solves the above-mentioned drawbacks and provides a high-speed and fast response to fluctuations in the feed rate even when abnormal conditions such as bridging occur or the relationship between the feeder force parameter and the feed rate is not proportional. The object of the present invention is to provide a combination weighing device that can stably control the feeding force of each feeder individually.

<One Embodiment of the Present Invention> (FIGS. 1 to 3) An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a schematic diagram of the mechanism section of the combination weighing device, and FIG. 2 is a schematic diagram of the control section.

In FIG. 1, 11 is a feeder that sequentially supplies objects to be weighed to a circular feeder 12. N intermediate hoppers 14 are provided below the periphery of the circular feeder 12.
₁ to 14 _o are arranged in a circle, each with feeder 1
The object to be weighed is supplied through 3 ₁ to 13 _o . Weighing hoppers 16 ₁ to 16 _o are set below the intermediate hoppers 14 ₁ to 14 _o , respectively. When the discharge gates 15 ₁ to 15 _o are opened, the objects to be weighed stored in the intermediate hoppers 14 1 to 14 _o are removed from the weighing hoppers ₁ to 15 o, respectively.
6 ₁ to 16 _o .

Weighing devices 17 ₁ to 17 _o are installed in the weighing hoppers 16 ₁ to 16 _o , respectively. Measuring instrument 17 ₁ ~
17 _o weighs the objects to be weighed accommodated in the weighing hoppers 16 ₁ to 16 _o , respectively, and outputs the weighed values.

A collection chute 19 is installed below the weighing hoppers 16 ₁ to 16 _o . Weighing hopper 16 ₁ ,
When the discharge gates 18 1 to 18 _o of the weighing hoppers 16 ₁ to 16 _o are opened, the objects to be weighed stored in the weighing hoppers _{16 o} fall into the collection chute 19 .

A packaging machine 21 is installed below the collection chute 19. At the bottom of the collection chute 19, a timing hopper 20 is provided which opens at regular intervals or in synchronization with the packaging machine 21.

The discharge gates 18 ₁ to 18 _o are the combined discharge device 2
The opening/closing is controlled by the discharge control device 27 of No. 4.

The measured values from the scales 17 ₁ to 17 _o are sent to the measured value storage circuit 25 of the combination discharge device 24, as shown in FIG. The weighing value storage circuit 25 stores the weighing values of the objects contained in the weighing hoppers 16 ₁ to 16 _o , respectively.

The combination selection circuit 26 includes a combination calculation section 26a that calculates all different combinations based on the weighing values of the contents of the weighing hoppers 16 ₁ to 16 _o stored in the weighing value storage circuit 25, and a combination calculating section 26a that calculates the set weight. The weight setting unit 26b stores the settings, compares the combined weight output of the combination calculation unit 26a, and the set weight output of the weight setting unit 26b, and selects, for example, the combination of weighing hoppers that has the smallest difference from the set weight as the optimal combination. and a combination determination unit 26c that selects the combination as shown in FIG.

Upon receiving the combination selection signal, the discharge control device 27 opens a designated one of the discharge gates 18 ₁ to 18 _o , and after a certain period of time, opens the discharge gate of the intermediate hopper to the weighing hopper that has already been discharged. Perform opening/closing control to open.

In addition, as shown in FIG. 2, each measurement value from each measuring device 17 ₁ to 17 _o is sent to an adder 30 ₁ to 30 _o of each feeding force parameter calculation circuit 29 ₁ to 29 _o , respectively, each time a measurement is performed. The weight accumulation memory 31 ₁ ~
_31o is added to the stored value (initial value "0"), and each addition result is newly stored in the weight accumulation memories _{311 to 31o via the switches 321 to 32o .}

Note that the adders 30 ₁ to 30 _o and the weight accumulation memory 3
1 ₁ to 31 _o and switches 32 ₁ to 32 _o constitute a supply amount integrating means of this measuring device.

On the other hand, the adders 33 ₁ to 33 _o add the stored values (initial value "0") of the feeding force parameter integration storage units 34 ₁ to 34 _o and the feeding force parameter at the current stage.
This addition result is sent via switches 35 ₁ to 35 _o ,
It is newly stored in the sending force parameter integration storage units 34 ₁ to 34 _o . Note that the adders 33 ₁ to 33 _o , the sending force parameter integration storage units 34 ₁ to 34 _o , and the switches 35 ₁ to 35 _o constitute a sending force parameter integrating means of this measuring device.

In addition, the switches 32 ₁ to 32 _o and the switches 35 ₁ to 35 _o are switches that are turned on in synchronization with the input of the weighing value, and the feeding force parameters are based on the vibration amplitude and vibration time of the vibrator of the feeder. The parameters are based on Therefore, each time a measurement is performed, the sending force parameters at that stage are accumulated in the sending force parameter accumulation storage units 34 ₁ to 34 _o .

Dividers 36 ₁ to 36 _o and multipliers 37 ₁ to 37 _o
constitutes a parameter candidate value calculation means, and the dividers 36 ₁ to 36 _o use the values stored in the weight integration memories 31 ₁ to 31 _o to the storage values in the feeding power parameter integration memories 34 ₁ to 34 _o . The value is divided. The multipliers 37 ₁ to 37 _o divide the set weight from the weight setting unit 26b of the combination discharge device 24 by the target combination hopper number using the divider 38, and calculate the result, that is,
Target weight W/M per hopper and divider 36 ₁ ~
36 _o are multiplied by the division results from o.
Therefore, the multiplication outputs of the multipliers 37 ₁ to 37 _o are:
The ratio of the integrated value ΣF of the feeding force parameter and the integrated value ΣW of the supply amount is multiplied by the target weight Wm, that is, (ΣF/ΣW)Wm (1). This formula is equivalent to (ΣF/K)(K/ΣW)Wm...(2), where K is the number of supplies up to the current stage, and this formula (2) is equivalent to the number of supplies up to K times. It is obtained by multiplying the ratio between the average value of the supply amount and the target weight by the average value of the feeding force parameters up to that point.

Therefore, when the average value of the feed amount is larger than the target weight, the calculation result will be smaller than the average value of the feed force parameter, and when the average value of the feed amount is smaller than the target weight, the calculation result will be the average value of the feed force parameter. greater than the value. That is, this calculation result indicates a new feeding force parameter candidate value (hereinafter referred to as a parameter candidate value) for bringing the next feeder supply amount closer to the target weight.

The multiplication outputs of the multipliers 37 ₁ to 37 _o are sent to the judgment circuit 4
Input from 0 ₁ to 40 _o .

In the determination circuits 40 ₁ to 40 _o , multipliers 37 ₁ to 3
It is determined whether the difference between the parameter candidate value from 7 _o and the stored value of the feeding force parameter storage device 60 ₁ to 60 _o is larger than the set value α of the tolerance setting device 61 ₁ to 61 _o . According to the determination result, a new sending force parameter is stored and updated in the sending force parameter storage devices 60 ₁ to 60 _o .

Note that all of the determination circuits 40 ₁ to 40 _o have the same configuration, and one of the determination circuits 40 ₁ is the third one.
It is configured as shown in the figure.

This determination circuit ₄₀₁ includes a subtraction unit 4 that determines the difference between the parameter candidate value and the current feeding power parameter.
0a, a determination unit 40b that determines whether the difference is within the range of ±α, and a parameter update unit 40c that updates the sending power parameter according to the determination result.
The subtracting section 40a, the determining section 40b, and the parameter updating section 40c constitute a subtracting means, a determining means, and a parameter updating means of this weighing device.

In the figure, the parameter candidate value is calculated by the subtraction unit 4.
It is input to the subtracters 41 ₁ and 42 ₁ of 0a. The subtracter 40 ₁ subtracts the parameter candidate value from the value stored in the sending power parameter storage device 60 ₁ and outputs the subtraction result to the subtracter 43 ₁ of the determination unit 40b.

The subtracter 43 ₁ subtracts the set value α of the tolerance setter 61 ₁ from the output of the subtracter 41 ₁ , and outputs the subtraction result to the comparator 44 ₁ .

The comparator 44 ₁ converts the output value from the subtracter 43 ₁ into
When compared with zero, when the output value of the subtracter ₄₃₁ is greater than zero, it outputs an "H" level voltage, and when it is smaller than zero, it outputs an "L" level voltage.

Therefore, when the output of the comparator ₄₄₁ is at the "H" level, the parameter candidate value is smaller than the stored value in the sending power parameter storage device ₆₀₁ , and the difference therebetween exceeds the set value α. It shows.

On the other hand, the subtracter 42 ₁ calculates, from the parameter candidate value,
By subtracting the value stored in the sending force parameter memory ₆₀₁ ,
This is output to the subtracter ₄₅₁ .

The subtracter 45 ₁ subtracts the set value α of the tolerance setter 61 ₁ from the output of the subtracter 42 ₁ , and outputs the subtraction result to the comparator 46 ₁ .

The comparator 46 ₁ compares the output value from the subtracter 45 ₁ with zero, and outputs an "H" level voltage when the output value of the subtracter 45 ₁ is greater than zero, and outputs an "H" level voltage when it is smaller than zero. , outputs "L" level voltage.

Therefore, when the output of the comparator ₄₆₁ is at the "H" level, it is determined that the parameter candidate value is larger than the stored value in the sending power parameter memory ₆₀₁ , and that the difference exceeds the set value α. It shows.

Furthermore, when the outputs of both comparators 44 ₁ and 46 ₁ are at the “L” level, the absolute value of the difference between the parameter candidate value and the stored value of the sending power parameter memory device 60 ₁ to 60 _o exceeds the set value α. It shows that there is no.

The outputs from both the comparators 44 ₁ and 46 ₁ are input to one input terminal of the AND circuits 47 ₁ and 48 ₁ of the parameter updating unit 40c, and the level voltages are inverted by the inverters 50 ₁ and 51 ₁ , respectively. and is input to the AND circuit ₄₉₁ .

An “H” level determination pulse P for storing a new sending force parameter in the sending force parameter storage 60 ₁ is input to one input terminal of each AND circuit 47 ₁ to 49 ₁ .

Each AND circuit 47 ₁ to 49 ₁ turns on one of the switches 52 ₁ , 53 ₁ , and 54 ₁ in synchronization with this judgment pulse P, depending on the output level of both comparators 44 ₁ and 46 ₁ . let

One end side of each switch 52 ₁ to 54 ₁ is connected to a feeding force parameter memory 60 ₁ , and the other end side of each switch 52 ₁ is connected to the stored value of the feeding force parameter memory 60 ₁ and a tolerance setting device 61 . It is connected to the output of an adder 55 ₁ that adds the set value α of ₁ .

The other end of the switch 53 ₁ is connected to the output of a subtracter 56 ₁ that subtracts the set value α of the tolerance setter _{61 1 from} the value stored in the sending force parameter memory 60 1 .

Furthermore, the other end of the switch 54 ₁ is connected to the multiplier 3
7 Connected to _{the 1} multiplication output.

Therefore, the judgment pulse P is
₁ to 49 ₁ , if the output of the comparator 44 ₁ is "H" level, the switch 53 ₁ is turned on and the subtraction result of the subtractor 57 ₁ is stored as a new sending power parameter. Also, if the output of the comparator ₄₆₁ is at "H" level, the switch ₅₂₁ is turned on and the addition result _of the adder ₅₆₁ is stored as a new sending power parameter in the sending power parameter memory. 60 ₁ will be stored.

Further, if the outputs of both comparators 44 ₁ and 46 ₁ are both at "L" level, the switch 54 ₁ is turned on,
The parameter candidate values are stored as they are in the sending power parameter storage device ₆₀₁ . Note that the other determination circuits 40 ₂ to 40 _o are configured exactly the same as this determination circuit 40 ₁ .

The values stored in the sending power parameter memories 60 ₁ to 60 _o are stored in the adders 33 ₁ to 33 _o and the timer circuit 63 ₁
~63 Output to _o . Timer circuit 63 ₁ ~ 63 _o
outputs a drive signal having a vibration amplitude and vibration time according to the values stored in the sending force parameter memory devices 60 ₁ to 60 _o . The drive signals from the timer circuits 63 ₁ to 63 _o are output to each feeder drive circuit 64 ₁ to 64 _o , respectively.

The feeder drive circuits 64 ₁ to 64 _o amplify the drive signals from the timer circuits 63 ₁ to 63 _o and drive the feeders 13 ₁ to 13 _o , respectively.

<Operation of Embodiment> Next, the operation of the combination weighing device according to the above embodiment will be described.

The object to be weighed passes through the feeder 11 and the circular feeder, and is supplied to intermediate hoppers 14 ₁ to 14 _o by feeders 13 ₁ to 13 _o , respectively.
₁ to 14 _o are placed in each weighing hopper 16 ₁ to 16 _o and weighed by a weighing device 17, respectively. The weighing value storage circuit 25 receives the weight signals from the scales 17 ₁ to 17 _o and stores the weighing value of the stored items in each weighing hopper.

The combination selection circuit 26 calculates all the different combinations based on each stored weighing value, selects the combination of weighing hoppers that has the smallest difference from the set weight W, and sends the combination selection signal to discharge control. It is sent to the device 27.

The discharge control device 27 opens the discharge gate of the weighing hopper designated by the combination selection signal and causes the discharge to the collection chute 19. The discharged objects to be weighed are gathered together in a collection chute 19, and when the timing hopper 20 is opened, they fall into a packaging machine 21 and are packed in bags.

Next, combinations are similarly selected using the remaining weighing hoppers, and combination discharge is performed. During this time,
The discharged weighing hopper receives the object to be weighed via a feeder and an intermediate hopper. A weight signal is output from the scale for the newly accommodated weighing hopper. In this way, while discharging and filling the weighing hopper continuously, combined discharging is performed one after another.

Each measurement value from each of the measuring devices 17 ₁ to 17 _o is sent to the sending force parameter calculation circuits 29 ₁ to 29 _o for each measurement while this combined measurement operation continues.

Here, for example, the sending force parameter memory 60 ₁
Assuming that the initial value F ₀ of the feeding force parameter is stored in advance, the weighing value W ₀ initially input to the adder 30 ₁ is determined by the feeding force parameter F ₀ .
This is the measured value of the object to be weighed that is fed by driving the feeder ₁₃₁ .

This weighed value W ₀ is added to the value stored in the weight accumulation memory 31 ₁ (in this case, the initial value “0”) by the adder 30 ₁ , and this addition result W ₀ +0 is added to the weight accumulation memory 31 1. 31 ₁ , it is newly memorized.

On the other hand, in synchronization with the adder 30 ₁ , the adder 33 ₁ uses the sending force parameter F ₀ of the sending force parameter storage 60 ₁ and the stored value (in this case, the initial value) of the sending force parameter integration storage 34 ₁ . “0”) is added,
This addition result F ₀ +0 is newly stored in the sending force parameter integration memory 34 ₁ .

Next, the stored value F ₀ of the sending force parameter accumulation memory 34 ₁ is determined by the divider 36 ₁ from the weight accumulation memory 31 ₁
This division result F ₀ / _{W 0 and} the target weight W/M are multiplied by the multiplier 37 ₁ , and this multiplication result F ₁ is sent to the determination circuit 40 ₁ as a parameter candidate value. is input.

In the determination circuit 40 ₁ , the parameter candidate value F ₁ and
The magnitude relationship with the current feeding force parameter F ₀ and
A determination is made as to whether the absolute value of the difference exceeds the set value α.

That is, if the parameter candidate value F ₁ is larger than the current feeding force parameter F ₀ and the difference is larger than the set value α, it is because a temporary abnormality has occurred in the feeder 13 ₁ etc. It is determined that the supply amount is small, and the value F ₀ +α obtained by adding only the set value α to the current feeding force parameter F ₀ is stored as a new feeding force parameter via the switch ₅₂₁ . The information is stored in the device ₆₀₁ .

Further, if the parameter candidate value F ₁ is smaller than the current feeding force parameter F ₀ and the difference is larger than the set value α, the feeder 13 ₁
It is determined that the amount of other feed is large due to a temporary abnormality, etc., and the value F ₀ − _α obtained by subtracting only the set value α from the current feeding force parameter is stored in the sending force parameter memory 60 ₁ via the switch 53 ₁ .

Furthermore, if the absolute value of the difference between the current feeding force parameter F ₀ and the parameter candidate value F ₁ is smaller than the set value α, the parameter candidate value F ₁ is set as the new feeding force parameter via the switch 54 ₁ . and stored in the sending force parameter memory ₆₀₁ .

The new sending power parameter stored in the sending power parameter storage device 60 ₁ in this way is sent to the timer circuit 63 ₁ , and at the next time of supply, the feeder 13 1 changes the feeder 13 ₁ according to this new sending power parameter. It is driven by the drive circuit 64 ₁ . At this time, the weight value W ₁ of the object to be weighed supplied from the feeder 13 ₁ is input to the adder 30 ₁ , and at the same time, the feeding force parameter of the feeding force parameter memory 60 ₁ is input to the adder 33 ₁ . , the same calculations and determinations as above are performed.

Exactly the same control is performed for the other feeders, and the supply amount of each feeder 13 ₁ to 13 _o is controlled as follows.
This is done every time a new weighing value is input.

Note _that when this feeding force control is performed for the feeder having the characteristics shown in FIG _.
will be 80g, and the next parameter F ₁ will be F ₁ = 100/80 = 1.25, and the supply amount W ₁ based on this parameter F ₁ will be:
It will be 120g. This is the same as the case of averaging using the conventional number of supplies described above, but the next parameter F ₂ is F ₂ = 100 × (1 + 1.25) / (80 + 120) = 1.125, and the next Supply amount W ₂
is approximately 95g, and the following parameter F ₃
is F ₃ = 100 × (2.25 + 1.125) / (20 + 95) = 1.14, and the next supply amount W ₃ with this parameter
is approximately equal to the target weight of 100g.

In this way, even if the feed amount is not proportional to the parameter, the feeder feed amount can be converged to the target weight by updating the parameters three times.

In addition, if the set value α is set to about 0.3, for example, it is possible to prevent the next feeding force parameter from changing by more than 0.3 from the current feeding force parameter, and the feeding force can be adjusted gradually in response to abnormal fluctuations in the supply amount. can be controlled.

<Effects of the Present Invention> As is clear from the above explanation, the combination metering device of the present invention has the ability to increase the feed force parameter calculated by the ratio of the feed force parameter integration result to the actual supply amount integration result. When the candidate value is within a predetermined range established based on the current feeding power parameter, the candidate value is set as a new feeding power parameter,
If it exceeds that range, use the upper limit or lower limit of that range as the new sending force parameter.
It is configured to control the feeding force of the feeder next time.

Therefore, even if the relationship between the feeding force parameter of the feeder and its supply amount is not proportional, the feeding amount of the feeder can be quickly brought close to the target weight. Since the next feed force parameter is updated within the specified range, the feed force is gently controlled in the event of large fluctuations in the supply amount, and even if there is an abnormal supply such as a bridge, the next supply amount will be adjusted. This prevents the supply of objects to be measured in an amount that is not selected for the combination due to an abnormal increase in the number of objects.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing the mechanism of a combination weighing device according to an embodiment of the present invention, FIG. 2 is a schematic block diagram of the control section, and FIG. 3 is a block diagram showing the main parts of FIG. 2. It is a diagram. FIG. 4 is a schematic configuration diagram showing a conventional combination metering device, and FIG. 5 is a diagram showing the relationship between the sending force parameter and the supply amount of the conventional combination metering device. 13 ₁ ~ 13 _o ... feeder, 16 ₁ ~ 16 _o ......
Weighing hopper, 17 ₁ ~ 17 _o ...Measuring device, 24...
Combination discharge device, 25...Measurement value storage circuit, 26
...Combination selection circuit, 27...Emission control device, 2
9 ₁ ~ 29 _o ... Feeding force parameter calculation circuit, 30 ₁
~30 _o ... Adder, 31 ₁ - 31 _o ... Weight accumulation storage, 33 ₁ - 33 _o ... Adder, 34 ₁ - 34 _o
...Transmission force parameter integration memory, 36 ₁ to 36 _o ...
...Divider, 37 ₁ ~ 37 _o ... Multiplier, 40 ₁ ~ 4
0 _o ... Judgment circuit, 44 ₁ , 46 ₁ ... Comparator, 5
6 ₁ ... Adder, 57 ₁ ... Subtractor, 60 ₁ ~ 60 _o
...Transmission force parameter memory, 61 ₁ ...Tolerance setter, 63 ₁ ~ 63 _o ... Timer circuit, 64 ₁ ~ 6
4 _o ...Feeder drive circuit.

Claims (1)

[Scope of Claims] 1. A plurality of weighing hoppers 16 ₁ to 16 _o , a plurality of weighing instruments 17 ₁ to 17 _o that respectively weigh objects to be weighed supplied to the plurality of weighing hoppers, and the plurality of weighing instruments. a combination discharge device 24 that selects the optimal combination of objects to be weighed based on each weighing value and discharges the selected objects to be weighed; A plurality of feeders 13 ₁ that feed objects to be weighed to empty weighing hoppers among the plurality of weighing hoppers using feeding force.
_-13o , a plurality of supply amount integrating means ₃₀₁ to _30o , each receiving measurement signals from the plurality of measuring instruments and integrating the measurement results each time the corresponding measuring instrument performs measurement. 31 ₁ to 31 _o , 32 ₁ to 32 _o are provided corresponding to the plurality of supply amount integrating means, and each time the corresponding supply integrating means integrates the weighing results, the feeder at the feeding stage is A plurality of sending force parameter integration means 33 ₁ to 33 _o , 34 ₁ to 34 _o , 35 ₁ to 3
5 _o , and the ratio between the integration results of the plurality of supply amount integration means and the integration result of the feeding power parameter integration means,
A plurality of parameter candidate value calculation means 36 ₁ to 36 that calculate candidate values of feeding power parameters for each feeder.
_o , 37 ₁ to 37 _o , and a plurality of subtraction means 40a for subtracting the current stage parameter of the corresponding feeder from each candidate value calculated by the plurality of parameter candidate value calculation means.
and a plurality of determination means 40b each determining whether or not the subtraction results of the plurality of subtraction means are within a range between a preset upper limit value and a lower limit value; When the candidate value is within the range of the lower limit value, the candidate value is set as the new sending power parameter, and when the result of the subtraction is larger than the upper limit value, the value obtained by adding the upper limit value to the current parameter of the corresponding feeder is set as the new sending power parameter. A combination comprising a plurality of parameter updating means 40c that updates a value obtained by subtracting the lower limit value from the current feeding force parameter of the corresponding feeder as a new parameter when the subtraction result is smaller than the lower limit value. Weighing device.