JPH0511771B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field of the Present Invention> The present invention relates to a combination weighing device that combines objects to be weighed stored in a plurality of memory hoppers to a target weight and collectively discharges the combined objects.

<Prior Art> (Fig. 3) Combination weighing devices have been used in the past to efficiently group objects to be weighed that vary individually, such as sweets and fruits, into a target weight.

This type of combination weighing device is constructed as shown in FIG. 3, for example, because the greater the number of combinations of objects to be weighed, the more accurate the combination weight can be obtained, and the higher the processing efficiency of the combination discharge operation. A combination weighing device was created.

That is, the objects to be weighed accommodated in the plurality of weighing hoppers 1 _-1 to 1 _-o are weighed by the respective weighing instruments 2 _-1 to 2 _-o , and the control unit 3 calculates the objects to be weighed based on the weighing signals. After the weight value of the object to be weighed is stored, for example, the left memory hopper 4 _-1 , 4 _- of the two memory hoppers 4 _-1 to 4 _-2o provided for each weighing hopper 1 _-1 to 1 _{-o 3} ,...4 _-2o-1 is discharged and stored. Empty weighing hopper 1 _-1 ~1
The next object to be weighed is stored in _-o , and the weight value of the stored object is stored in the same way as above, and the memory hoppers 4 _-2 , 4 _-4 , ...4 _-2o on the right are discharged and stored. be done.

The control unit 3 combines the weight values of the objects to be weighed stored in the memory hoppers 4 _-1 to 4 _-o , selects the optimum combination for the target weight, and discharges the objects to be weighed from the memory hoppers selected in the combination.

The objects to be weighed discharged from the memory hopper are discharged all at once via the collection chute 5, and are packaged, for example. During this time, the next weighed object is stored in the empty memory hopper, and the same combination and ejection operation as described above is repeated.

<Problems to be Solved by the Present Invention> However, if the state of supply of the objects to be weighed to the weighing hopper changes significantly during the operation of the above-mentioned combination weighing device (for example, when the state of the objects to be weighed is changed near the end of production) (e.g., when the supply of goods is drastically reduced),
Even if objects to be weighed are stored in all memory hoppers, the optimum combination for the target weight cannot be selected and the weighing operation stops.

In such a situation, conventional methods have been used to restart the weighing operation, such as returning the object to be weighed in the memory hopper to the supply line or manually adjusting the amount of the object to be weighed supplied to the weighing hopper. This required extremely complicated work.

In order to solve this problem, a weighing device was proposed in Japanese Patent Application Laid-Open No. 56-1981, which, if the optimum combination cannot be obtained, additionally inserts articles into a predetermined hopper and reselects the combination.
No. 93016 and Japanese Patent Application Laid-Open No. 60-227130.

However, with these technologies, there is no limit to the amount of articles that are actually added, so the amount of additional articles in the hopper may exceed the target weight or capacity limit and become unusable for subsequent combinations. Put it away.

In addition, situations in which a combination cannot be selected are not limited to situations when goods are supplied to all hoppers.
This also occurs when some hoppers are empty, but in the above-mentioned Japanese Patent Application Laid-Open No. 60-227130, if a combination cannot be selected, additional items are added unconditionally.
There was waste in that items were not supplied to empty hoppers and additional supplies were made to already accommodated hoppers.

<Object of the present invention> The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a combination weighing device that prevents the occurrence of an unusable hopper due to additional charging and eliminates unnecessary additional charging. It is said that

<One Embodiment of the Present Invention> An embodiment of the present invention will be described below based on the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being a schematic diagram of a mechanism section of a combination weighing device, and FIG. 2 being a schematic diagram of a control section.

In FIG. 1, 11 is a feeder that sequentially supplies objects to be weighed to a circular feeder 12. As shown in FIG. N weighing hoppers 1 are provided below the periphery of the circular feeder 12.
4 _-1 to 14 _-o are arranged in a circle, and objects to be weighed are supplied via feeders 13 _-1 to 13 _-o , respectively.

Weighing devices 15 _-1 to 15 _-o are installed in the weighing hoppers 14 _-1 to 14 _-o , respectively. Measuring device 15
_-1 to 15 _-o weigh the objects to be weighed accommodated in the weighing hoppers _14-1 to 14 _-o and output the measured values.

The weighing hoppers _14-1 to 14- _o are provided with two independent discharge gates _16-1 to _16-2o , and below the weighing hoppers _14-1 to 14 _-o , two discharge gates are each provided. Memory hopper 17 _-1 ~1
7 _-2o is installed. Weighing hopper 14 _-1 ~1
4. The object to be weighed stored in _-o is discharged through the discharge gate 16 _-1.
~16 When one side of _{the -2o} is opened, the memory hopper on the corresponding side falls and is stored.

A collection chute 19 is installed below the memory hoppers 17 _-1 to 17 _-2o . The objects to be weighed stored in the memory hoppers 17 _-1 to 17 _-2o fall into the collection chute 19 when the respective discharge gates 18 _-1 to 18 _-2o are opened.

A packaging machine 21 is installed below the collection chute 19. At the bottom of the collection chute 19, a timing hopper 40 is provided which opens at regular intervals or in synchronization with the packaging machine 21.

On the other hand, in the control section, each measurement value from the measuring instruments 15 _-1 to 15 _-o is stored in each memory calculation circuit 22 _-1 to 15 -o.
₂₂ Sent to -o. Memory calculation circuit 22 _-1 ~ 22
_-o stores the weight value of the object to be weighed accommodated in each of the weighing hoppers 14 _-1 to 14 _-o in correspondence with the memory hopper that discharges and accommodates the object to be weighed, and stores this stored value and the next weight value. and the weight value of the object to be weighed accommodated in the weighing hopper, and when the addition result is less than a predetermined weight, the added weight is output to the additional input hopper selection circuit 43, respectively.

Here, the storage arithmetic circuits 22 _-1 to 22 _-o are constructed as shown in FIG. Note that the internal configuration of the memory arithmetic circuits 22 _-2 to 22 _-o is similar to that of the memory arithmetic circuit 22
Since it is exactly the same as _-1 , it will be explained by changing only the subscript of the code without showing it.

In the figure, 23 _-1 to 23 _-o are weighing hoppers 1
After being stored and weighed in _4-1 to 14 _-o , the memory hoppers _17-1 , 17-3, and _17-3 on one side (for example, the left side)
... _17-2o-1 stores the weight values of the objects to be weighed discharged and stored, _24-1 to 24 _-o are memory hoppers _17-1 , _17-3 , ... _17-1 on one side. ₂
It turns ON when the objects to be weighed stored in _o-1 are selected in combination and discharged, and the weight memory devices 23 _-1 to 23
This is a switch for resetting the memory contents of _-o to "0".

25 _-1 to 25 _-o are weight memory devices 23 _-1 to 23 _-o
The adder 26 -1 to 26 _-o is an arithmetic circuit that adds the stored value and the measured value from the measuring instruments _{15 -1} to _{15 -o} and outputs the addition result.
This is an addition value storage device that stores the addition output from _-o and outputs this stored value. 27 _-1 to 27 _-o are
The discharge gates 16 _-1 , 16 _-3 , ... 16 _-2o-1 on one side of the weighing hoppers 14 _-1 to 14 _-o open and the object to be weighed is transferred to the memory hoppers 17 _-1 , 17 _-3 , ... 17 _- Turns ON when discharged and stored in _2o-1 , and the added value memory 26
_-1 to 26 _-o are stored in the weight memory 23 _-1 to 23 _-o
This is a switch that allows you to memorize the information.

28 _-1 to 28 _-o are reference value setters 42, which will be described later.
The reference value from the addition value memory unit 26 _-1 to _{26 -o} is compared, and when the stored value is smaller than the reference value, the stored value is "L" level, and conversely, the stored value is lower than the reference value. This is a comparator that outputs an "H" level when .

29 _-1 ~ 29 _-o are weighing hoppers 14 _-1 ~ 14 _-o
The object to be weighed is not stored in the weighing machine 15 _-1 ~ 1
5 When the weighing value from _-o is “0”, “H” level,
The zero detectors 30 _-1 to 30 _-o that output the "L" level when the signal is not "0" are connected to the outputs of the comparators 28 _-1 to 28 _-o and the outputs of the zero detectors 29 _-1 to 29 _-o . This is an OR circuit that calculates the logical sum of , and drives the switches 31 _-1 to 31 _-o .

Switches 31 _-1 to 31 _-o are comparators 28 _-1 to 2
8 _-o constitutes the addition value selection circuit of this embodiment, and is turned ON when the output of the OR circuits 30 _-1 to 30 _-o is at "L" level, and the addition value storage units 26 _{-1 to 30} -o are turned ON. Among the stored values of 26 _-o , the stored values below the reference value are sent to the additional input hopper selection circuit 43, and when the outputs of the OR circuits 31 _-1 to 31 _-o are at "H" level, the sending of the stored values is prohibited. do.

Note that in the above configuration, the memory hopper 17 on the other side
_-2 , 17 _-4 , ...17 _-2o are configured in exactly the same way.

That is, 33 _-1 to 33 _-o are the discharge gates 1 of the memory hoppers 17 _-2 , 17 _-4 , . . . 17 _-2o on the other side.
When _8-2 , _18-4 , ... _18-2o is opened, the memory contents are reset to "0" by switches _34-1 to 34 _-o , which are turned ON, and each memory hopper 17
_-2 , 17 _-4 , ... 17 _-2o Weight storage device for storing the weight of the object to be weighed, 35 _-1 to 35 _-o
is an adder serving as an arithmetic circuit that adds the stored values of the weight value storage devices 33 _-1 to 33 _-o and the measured values from the scales 15 _-1 to 15 _-o .

36 _-1 to 36 _-o are addition value storage devices for storing the addition results from the adders 35 _-1 to 35 _-o , and 37 _-1 to 3
7 _-o is turned ON when the weighing object is discharged and stored from the weighing hoppers 14 _-1 to 14 _-o to the memory hoppers 17 _-2 , 17 _-4 , . . . 17 _-2o on the other side, and the adder 3 is turned on.
6 _-1 ~ 36 _-o stored values in weight memory 33 _-1 ~ 33
_- This is a switch to store in o.

38 _-1 to 38 _-o are the reference value and addition value storage 26
It is a comparator for comparing the stored values of _-1 to 26 _-o , and together with switches _41-1 to 41 _-o , which will be described later, constitutes an addition value selection circuit. 40 _-1 to 40 _-o are the comparison outputs of comparators 38 _-1 to 38 _-o and zero detectors 29 _-1 to 2
9 Take the logical sum with the output of _-o , and switch 41 _-1 ~
41 _- This is an OR circuit that controls -o. switch 41
_-1 to 41 _-o are turned on when the outputs of the OR circuits 40 _-1 to 40 _-o are at "H" level, and the addition value storage 36 _-
1 to 36 _-o additional input hopper selection circuit 4
Send to 3.

42 is a reference value setter in which a predetermined reference value (for example, a combined target weight value of the object to be weighed) is set, and this reference value is set in each memory calculation circuit 22 _-1 to 22
_-o are output to comparators 28 _-1 to 28 _-o and 38 _-1 to 38 _-o .

Reference numeral 43 indicates that when the additional input signal A is input, the switches 31 _-1 to 3 of the memory calculation circuits 22 _-1 to 22 _-o are activated.
1 _-o , _41-1 to 41 _-o , which corresponds to the smallest stored value among the stored values from the addition value storage units _26-1 to _26-o , _36-1 to 36 _-o . This is an additional loading hopper selection circuit that selects a memory hopper and outputs a selection signal for additionally loading an object to be weighed from a weighing hopper corresponding to the selected memory hopper. This additional input selection circuit 43 is constituted by, for example, a microcomputer or the like programmed with an operation for detecting the minimum value.

Reference numeral 44 denotes a discharge supply control device which opens the selected discharge gate of the weighing hopper corresponding to the selection signal from the additional input hopper selection circuit 43 and additionally inputs the object to be weighed into the memory hopper. This discharge supply control device 44 opens the discharge gate of the memory hopper corresponding to the combination selection signal from the combination selection circuit 45 described later, opens the discharge gate of the weighing hopper corresponding to the empty memory hopper, and further , the feeder corresponding to the empty weighing hopper is driven to control the discharge and supply operation of the object to be weighed.

On the other hand, the stored values of each weight storage circuit 23 _-1 to _{23 -o} , 33 _-1 to 33 _-o of each storage circuit 22 _-1 to 22 -o are sent to a combination selection circuit 45 , a detection circuit 46 and a comparison circuit 47 It is being sent out.

The combination selection circuit 45 selects each weight storage device 23 _-1 to 23 _-o , 3 every time the combination request signal B is input.
Based on the stored values of 3 _-1 to 33 _-o , perform all different combination calculations, select the combination whose combined weight is closest to the target weight of the object to be weighed within the predetermined weight range, and apply this combination. A selection signal for the corresponding memory hopper is sent to the discharge/supply control device 44, and when a combined weight for the target weight cannot be obtained, a combination impossible signal is sent to the AND circuits 48, 49.

The detection circuit 46 constitutes the first detection circuit of this embodiment together with the AND circuit 48, and each time the combination request signal B is input, each weight value storage device 23 _-1 to 23 _-o , 33 _-1 ~ ₃₃ When all the stored values are not "0" after receiving the stored values from -o (that is, all memory hoppers 17 _-1 ~ 1
7) When the object to be weighed is stored in _-2o ) When either the “H” level or the memorized value is “0”,
The “L” level is output to the AND circuit 48.

Therefore, the output of the AND circuit 48 becomes "H" only when objects to be weighed are stored in all memory hoppers 17 _-1 to _{17 -2o} and a combination corresponding to the target weight of the objects to be weighed cannot be obtained. level.

The comparison circuit 47 constitutes a second detection circuit together with an AND circuit 49, an inverter 50, a counter 52, a comparator 53, and a limit value setter 54, and each time the combination request signal B is input, It detects whether the object to be weighed is stored in the memory hopper, and stores the previously stored memory hopper group.
If the currently detected memory hopper group matches, it outputs an "H" level, and if they do not match, it outputs an "L" level to the AND circuit 49 and the inverter 50.

Therefore, the output of the AND circuit 49 indicates that the memory hopper group that accommodated the object to be weighed when the previous combination was selected matches the memory hopper group that accommodated the object to be weighed when the current combination was selected. The "H" level is reached only when a combination corresponding to the target weight of the object to be measured cannot be obtained.

The output of the AND circuit 48 is output to the OR circuit 51, and the output of the AND circuit 49 is output to the counter 5.
It is output to 2. Counter 52 counts and outputs the output from AND circuit 49, and is reset by the output of inverter 50.

The output of the counter 52 is input to a comparator 53, and the comparator 53 sets a predetermined limit value (for example,
The set value from the limit value setter 54 set to "3") is compared with the output value of the counter 52, and when the output of the counter 52 exceeds the set value, an "H" level is output to the OR circuit 51. do.

The "H" level output of the OR circuit 51 is used as the additional input signal A to the additional input hopper selection circuit 43.
Activate.

<Operation of the above embodiment> Next, the operation of the above embodiment will be explained.

Assuming that all weighing hoppers 14 _-1 to 14 _-o and memory hoppers 17 _-1 to 17 _-2o do not contain objects to be weighed in advance, the discharge and supply control device 44 controls each feeder 13 _-1 to 13 _-o is driven, and the object to be weighed is fed from the feeder 11 via the circular feeder 12 to each weighing hopper 14 _-1 to 14
_-o respectively.

The objects to be weighed stored in the weighing hoppers 14 _-1 to 14 _-o are weighed by the weighing instruments 15 _-1 to 15 _-o ,
The weighing values corresponding to the accommodated objects to be weighed are sent to storage/arithmetic circuits 22 _-1 to 22 _-o , respectively.

Memory operation circuit 22 _-1 to _{22 -o} adder 25 _-1 to
Each weighing value input to 25 _-o , 35 _-1 ~ 35 _-o is the weight memory value 24 _-1 ~ 24 _-o , 34 _-1 ~ 34 _-o
is added to the stored value (“0” in the case of “0”) and stored in each of the added value storage units 26 _-1 to 26 _-o and 36 _-1 to 36 _-o . At this time, since objects to be weighed are accommodated in all the weighing hoppers 15 _-1 to _{15 -o} , the zero detectors 29 _-1 to 29 _-o outputs are at "L" level and the comparator 28 _-1 ~ 28 _-o , 38 _-1 ~ 38 _-o output becomes "L" level, and switch 31 _-1 ~ 3
1 _-o , _41-1 to 41 _-o are turned on, but the additional input hopper selection circuit 43 does not operate until the additional input signal A is input.

The objects to be weighed stored in the weighing hoppers 14 _-1 to 14 _-o are transferred to one side (for example, the left side) of the discharge gates 16 _-1 , 16 _-3 . . . by the discharge supply control device 44 .
16 _-2o-1 is opened and stored in the left memory hoppers 17 _-1 , 17 _-3 , . . . 17 _-2o-1 , respectively. Along with this storage operation, the switches 27 _-1 to 27 _-o of each storage arithmetic circuit are turned on, so the stored values stored in the addition value storage units 76 _-1 to 76 _-o are stored in the left memory hopper 17 _-1 , 17 _-3 , . . . 17 _-2o-1 are respectively stored in the weight storage devices 23 _-1 to 23 _-o as the weight values of the objects to be weighed.

The object to be weighed is stored in memory hoppers 17 _-1 , 17 _-3 , ...
17 Empty weighing hopper 1 stored in _-2o-1
4-1 to 14 _-o , by the feeders _13-1 to 13 _-o driven by the discharge supply control device 44,
The next object to be weighed is stored, and each weighing device 15 _-1 to 1
5 The weighing value from _-o is sent to adder 25 _-1 to 25 _-o , 35
_-1 to 35 Output to _-o .

In the adders 25 _-1 to 25 _-o on one side, the left memory hoppers _{17 -1} , _{17 -3 , .} The weight value and measurement value of the object are added and stored in the added value storage devices 26 _-1 to 26 _-o , respectively.

Furthermore, in the adders 35 _-1 to 35 _-o on the other side, the stored values of the weight memory units 33 _-1 to 33 _-o (in this case "0")
and the measured value are added, and each added value memory 3
6 _-1 to 36 _-o .

The objects to be weighed stored in the weighing hoppers 14 _-1 to 14 _-o are then controlled by the discharge supply control device 44 as follows:
The other side (right side) discharge gate 16 _-2 , 16 _-4 ...
16 _-2o is opened and the right memory hopper 17 _-2 ,1
7 _-4 , ...17 _-2o respectively.

At this time, since the switches 37 _-1 to _{37 -o} of each memory calculation circuit 22 _-1 to 22 -o are turned on, the memory values stored in the addition value storage devices 36 _-1 to 36 _-o are transferred to the right memory hopper 17 _-2 , 17 _-4 , ...17 As the weight value of the object to be weighed stored in _-2o , the weight memory 3
3 _-1 to 33 _-o , respectively.

Each weight memory device 23 _-1 ~ 23 _-o , 33 _-1 ~ 33 _-o
The weight value of the object to be weighed stored in is sent to the combination selection circuit 45, and when the combination request signal B is input, the combination selection circuit 45 selects the weight value of the object to be weighed that is closest to the target weight value of the object within a predetermined range. A combination of combined weights is selected.

As a result, a combination selection signal corresponding to the selected memory hopper is sent to the discharge supply control device 44.

The discharge supply control device 44 receives this combination selection signal and opens the discharge gate of the selected memory hopper.

At this time, among the switches 24 _-1 to 24 _-o , 34 _-1 to 34 _-o of each memory operation circuit 22 _-1 to 22 _-o ,
The switch corresponding to the memory hopper from which the object to be weighed has been discharged after the combination is selected is turned on, and the stored value of the weight memory device corresponding to this switch is reset to "0".

As a result, the objects to be weighed whose combinations have been selected and discharged are collected in the timing hopper 20 via the collection chute 19, and the timing hopper 20 is opened in synchronization with the packaging machine 21.
Packaged by.

During this ejection operation, objects to be weighed are stored in the empty weighing hopper from the feeder, and objects to be weighed are stored in the memory hopper that is now empty after combination selection. Similarly to the above, the weight value is stored in the weight storage device corresponding to the accommodated memory hopper, and the next combination selection operation is performed.

Similarly, each time the combination request signal B is input, the combination discharge operation of the objects to be weighed is repeated.

For example, if the amount of objects to be weighed supplied from the feeders _13-1 to 13 _-o fluctuates extremely and becomes small, the combination selection circuit 45 selects the target weight of the objects to be weighed within a predetermined range. When the closest combination weight cannot be obtained, the combination selection circuit 44 sends an "H" level combination impossible signal to the AND circuit 4.
It is output on 8,49.

At this time, all memory hoppers 17 _-1 to 17
_-o contains the object to be weighed, the detection circuit 46
The output becomes "H" level, the output of the AND circuit 48 becomes "H" level, and the additional input signal A is input from the OR circuit 51 to the additional input hopper selection circuit 43.

At this time, each memory calculation circuit 22 _-1 to 22 _-o stores the weight value of the weighing hopper in which the object to be weighed is stored, and the weight value of the object to be weighed stored in the left and right memory hoppers corresponding to the weighing hopper. The added values are compared with the reference value of the reference value setter 42, and only the added value smaller than the reference value is selected and input to the additional input hopper selection circuit 43.

Therefore, in the additional input hopper selection circuit 43, when the additional input signal is input, the minimum additional value among the additional values smaller than the reference value is detected,
The memory hopper corresponding to this minimum addition value is selected, and this selection signal is sent to the discharge supply control device 44.

Here, for example, when the added value of the added value storage 26 _-1 is selected as the minimum added value, the discharge supply control device 44 that receives the selection signal from the additional input hopper selection circuit 43 responds to the selection signal. In order to additionally charge the object to be weighed into the memory hopper _17-1 , the discharge gate _{16-1 of} the weighing hopper _14-1 corresponding to the selected memory hopper 17-1 is opened.

At this time, the switch _27-1 is turned on, and the added value storage _26-1 having the minimum added value is stored as the weight value of the object to be weighed stored in the additionally loaded memory hopper _17-1 . Stored in the value 23 _-1 .

As a result, a combination selection operation by the combination selection circuit 45 is started, and when a combination is obtained by this combination selection operation, the objects to be weighed are discharged from the plurality of memory hoppers whose combinations have been selected in the same manner as described above, and are transferred to the collection chute 19. and timing hopper 2
0 to the packaging machine 21.

Further, if the combination selection circuit 45 cannot obtain a combination, the additional loading signal is sent to the additional loading hopper selection circuit 43 again, and the object to be weighed is additionally loaded into the selected memory hopper in the same manner as described above.
A combination selection operation is performed.

In addition, as it is near the end of production, the circular feeder 1
If the objects to be weighed from 2 are not evenly supplied to each feeder 13 _-1 to 13 _-o , but are supplied unevenly,
The object to be weighed will be stored only in a specific memory hopper group.

In such a state, if the optimal combination of objects to be weighed cannot be obtained by the combination selection operation three times in a row within the limit value, an additional input signal A is sent from the comparator 53 via the OR circuit 51 to the additional input hopper selection circuit 43. After the above-mentioned additional input is performed, the combination selection operation is performed again.

In the manner described above, additional input is performed and the combined discharge operation continues until the combined weight closest to the target weight within a predetermined range is obtained.

<Other embodiments of the present invention> In the above embodiments, the weight value of the object to be weighed stored in the weighing hopper and the added value of the weight value of the object to be weighed stored in the memory hopper are compared, The object to be weighed is added to the memory hopper corresponding to the minimum added value, but this is not limited to the minimum added value; for example, it may be the maximum added value or an intermediate added value. , objects to be weighed may be added to a plurality of memory hoppers at the same time.

Further, in the above embodiment, the reference value of the reference value setting device 42 is set as the target weight value of the object to be weighed, but this may be set to a value lower than the target weight value, or the measurement limit of the measuring instrument It can also be a value.

Furthermore, the present invention is not limited to the circuit configuration of the above-described embodiment, and various modifications and applications are possible without departing from the gist of the present invention.

<Effects of the Present Invention> As explained above, the combination weighing device of the present invention, when the optimum combination for the target weight of the object to be weighed cannot be obtained, combines the weight value of the object to be weighed stored in the weighing hopper with the weight of the object to be weighed. The object to be weighed is additionally put into at least one of the memory hoppers for the added value of the weight of the object to be weighed already stored in the memory hopper corresponding to the weighing hopper, which is less than a predetermined reference value. This eliminates the occurrence of memory hoppers that become unusable due to additional input.

In addition to when objects to be weighed are stored in all memory hoppers, this method can also be used only when the objects to be weighed are only in a specific memory hopper and the combination cannot be selected a predetermined number of times in succession due to unbalanced supply conditions, etc. Since additional input is made, there is no need to waste additional input.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a mechanism section of an embodiment of the present invention, Fig. 2 is a block diagram showing a control section of an embodiment, and Fig. 3 is a schematic diagram showing a conventional combination weighing device. be. 14 _-1 ~14 _-o ...Weighing hopper, 15 _-1 ~15
_-o ...Measuring instrument, 17 _-1 ~ 17 _-2o ... Memory hopper, 22 _-1 ~ 22 _-o ... Memory calculation circuit, 23 _-1 ~
23 _-o ... Weight memory, 25 _-1 ~ 25 _-o ... Adder, 26 _-1 ~ 26 _-o ... Addition value storage, 28 _-1 ~
28 _-o ... Comparator, 33 _-1 ~ 33 _-o ... Weight memory, 35 _-1 ~ 35 _-o ... Adder, 36 _-1 ~ 36 _-o
...addition value storage, 38 _-1 to 38 _-o ...comparator,
42... Reference value setter, 43... Additional input hopper selection circuit, 44... Supply/discharge control device, 45...
Combination selection circuit, 46...Detection circuit, 47...Comparison circuit, 52...Counter, 53...Comparator, 5
4...Limit value setter.

Claims (1)

[Scope of Claims] 1. A plurality of weighing hoppers that accommodate objects to be weighed; a plurality of weighing devices that respectively detect weight values of the objects to be weighed accommodated in the plurality of weighing hoppers; and one weighing device for each of the weighing hoppers. a plurality of memory hoppers each accommodating an object to be weighed which is selectively discharged from a corresponding weighing hopper; a plurality of weight storage devices each storing the weight value of the object to be weighed stored in the plurality of memory hoppers; a weighing value from a weighing device of the weighing hopper in which the object to be weighed is stored; an arithmetic circuit that adds the weight values of objects to be weighed already stored in corresponding memory hoppers; and an added value selection circuit that selects an added value that is less than or equal to a predetermined reference value from among the added values from the arithmetic circuit. , a combination selection circuit that performs a combination calculation based on the weight values from the plurality of weight storage devices and selects the optimal combination for the target weight of the object to be weighed; and the object to be weighed is accommodated in all of the plurality of memory hoppers. a first detection means for detecting that the optimum combination could not be selected by the combination selection circuit in the state; a second detection means for detecting that the selection circuit has failed to select the optimal combination a predetermined number of times in succession; and upon receiving a detection signal from the first detection means or the second detection means; An additional loading hopper selection circuit that selects a memory hopper corresponding to an additional value that satisfies a predetermined condition from among the additional values from the additional value selection circuit, and causes the selected memory hopper to additionally input an object to be weighed from a corresponding weighing hopper. A combination weighing device characterized by comprising: