JPH0641877B2 - Combination weighing device - Google Patents

Description

Description: <Industrial field of application of the present invention> The present invention relates to a combination weighing device that combines a set amount of objects to be weighed stored in a plurality of hoppers and discharges them together.

<Prior Art> (Fig. 4) Conventionally, a combination weighing device has been used in order to efficiently collect the objects to be weighed, such as sweets and fruits, which have variations, by a set amount.

In this type of combination weighing device, the more the number of combinations of the objects to be weighed, the more accurate the combination can be obtained, and the processing efficiency of the combination discharge operation can be increased. Therefore, the combination weighing device configured as shown in FIG. There is.

That is, the objects to be weighed stored in the plurality of weighing hoppers 1 _-1 to 1 _-n are weighed by the respective weighing devices 2 _-1 to 2 _-n , and the weight value of the objects to be weighed is controlled based on this weighing signal. Part 3
2 in each weighing hopper 1 _-1 to 1 _-n after being stored in
Memory hoppers 4 _-1 to 4 _-n , 5 _{-1 to} 5 _-n provided individually
Of, for example, it is discharged housed in the left side of the memory hoppers 4 _-1 to 4 _-n. The emptied weighing hoppers 1 _-1 to 1 _-n store the next objects to be weighed, the weight values of the objects to be weighed stored in the same manner as above are stored, and the right side memory hoppers 5 _-1 to Discharged to 5- _n .

The discharged emptied weighing hoppers 1 _-1 to 1 _-n further accommodate and weigh the next object to be weighed.

The control unit 3 controls the memory hoppers 4 _-1 to 4 _-n , 5 _{-1 to} 5 _-n.
Value of the objects to be weighed stored in each and each weighing hopper 1 _-1 to 1
Based on the measured value of the object to be weighed stored in _-n , a combination calculation is performed, the optimum combination for the set weight is selected, and the selected object to be weighed is discharged.

Since the weighing value of the object to be weighed stored in the weighing hopper is combined with the weight value of the object to be weighed stored in the corresponding memory hopper to participate in the combination calculation,
When the objects to be weighed in the weighing hopper are selected in combination, the objects to be weighed in at least one of the memory hoppers are also selected in combination and discharged together with the objects to be weighed in the weighing hopper.

The objects to be weighed discharged from the memory hopper and the objects to be weighed discharged from the weighing hopper via the memory hopper are collectively discharged via the collecting chute 6 and are packaged, for example. Even during this time, the discharged and empty memory hopper stores the next weighed object to be weighed, and the empty weighing hopper also stores the object to be weighed. The discharging operation is repeated.

<Problems to be Solved by the Present Invention> However, when the state of supply of the objects to be weighed to the weighing hopper largely changes during the operation of the combination weighing device as described above (for example, the objects to be weighed near the end of production). Even if the objects to be weighed are stored in all the memory hoppers and the weighing hoppers, the optimum combination for the set weight cannot be selected and the weighing operation stops.

In such a state, conventionally, the weighing operation in the memory hopper and the weighing hopper is returned to the supply line, or the feeding amount of the weighing object supplied to the weighing hopper is manually adjusted. Very complicated work was required to restart.

As a conventional technique for solving such a problem, for example, Japanese Patent Application Laid-Open No. 58-190725 discloses a combination of weighing data of a certain number or less of selected weighing machines out of all weighing machines and setting the set value to the maximum. A close combination is obtained, and when the total value of this combination is within the set allowable range, the articles are added to the weighing machine with the smallest weighing data among the selected fixed number of weighing machines, and the weighing to participate in the combination selection. Techniques for changing the value of data are shown.

However, with this technology, since the articles of unknown weight are added to the articles already stored in the weighing machine, even if the weighing data of the articles already stored in the weighing machine is smaller than the other weighing data. However, there is a problem in that the total weight of the articles after the additional charging becomes excessive, and there is a weighing machine that cannot participate in subsequent combinations.

In addition, when there is a large deviation in the state of supply of goods to each weighing machine, such as at the start and end of operation, and only some specific weighing machines are supplied with goods, empty weighing is performed. There was a problem that the empty loading of the machine was repeated in vain.

<Object of the Present Invention> The present invention has been made in view of the above circumstances, and does not cause a stop of the weighing operation due to an inability to obtain an optimum combination of objects to be weighed with respect to a set amount, and further, an overweight hopper. It is an object of the present invention to provide a combination weighing device that does not generate waste and does not wastefully add.

<One Embodiment of the Present Invention> (FIGS. 1 and 2) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of the present invention.
FIG. 1 is a schematic configuration diagram of a mechanical unit of the combination weighing device, and FIG. 2 is a schematic configuration diagram of a control unit.

In FIG. 1, reference numeral 11 is a feeder for sequentially feeding the objects to be weighed to the circular feeder 12. N intermediate hoppers 14 _{-1 to} 14 _-n are arranged in a circle below the peripheral edge of the circular feeder 12, and the objects to be weighed are supplied via the feeders 13 _{-1 to} 13 _-n , respectively.

Below the intermediate hopper 14 _-1 to 14 _-n, it is disposed respectively weighing hopper 16 _-1 ~ 16 _-n. Intermediate hopper 14
_{-1 to} 14 _-n , the objects to be weighed are fed to the intermediate hopper 14 _-1.
Opening a to 14 _-n discharge gate 15 _-1 to 15 _-n of, it is housed in the weighing hopper 16 _-1 ~ 16 _-n each corresponding.

Each of the weighing hoppers 16 _{-1 to} 16 _-n has a weighing device 17 _-1.
~ 17- _n is installed. The measuring instruments 17 _{-1 to} 17 _-n are
The objects to be weighed stored in the weighing hoppers 16 _{-1 to} 16 _-n are weighed and the measured value is output.

The weighing hopper 16 _-1 to 16 _-n, independent two by the discharge gate 18 _-1 ~ 18 _-n, and 19 _-1 ~ 19 _-n are provided, the weighing hoppers 16 _-1 to 16 _{- Below n} ,
Two memory hoppers 20 _{-1 to} 20 _-n , 21 each
_{-1 to} 21 _-n are installed. Weighing hopper 16 _{-1 to} 16
_The objects to be weighed stored in _-n are discharge gates 18 _-1 to 1
8 _-n, open one side of 19 _-1 ~ 19 _-n, is dropped accommodated into the corresponding one of the memory hopper.

A collecting chute 24 is installed below the memory hoppers 20 _{-1 to} 20 _-n and 21 _{-1 to} 21 _-n . The objects to be weighed stored in the memory hoppers 20 _{-1 to} 20 _-n and 21 _{-1 to} 21 _-n are respectively discharged gates 22 _{-1 to} 22 _-n , 23 _-1 to 2 respectively.
When 3- _n is opened, it falls on the collecting chute 24.

A packaging machine 26 is installed below the collecting chute 24. The bottom of the collecting chute 24 is provided with a timing hopper 25 that opens at regular time intervals or in synchronization with the packaging machine 26.

On the other hand, in the control unit, the weight value from the weighing device 17 _-1 to 17 _-n is sent to each storage operation circuit 27 _-1 ~ 27 _-n respectively. The memory operation circuits 27 _{-1 to} 27 _-n are configured as shown in FIG. 2, and the weight values of the objects to be weighed stored in the respective weighing hoppers 16 _{-1 to} 16 _-n are converted into the objects to be weighed. Is stored in association with the memory hopper for discharging and storing, and the stored value and the weight value of the object to be weighed stored in the weighing hopper are added. When the addition result is less than or equal to a predetermined weight, The added weight is output to each additional input hopper selection circuit 48.

In FIG. 2, 28 _{-1 to} 28 _-n are weighing hoppers 16 _-1.
To 16 after housed metered _-n, one side (e.g., left side) weight storage unit for storing the weight values of the objects to be weighed which have been discharged accommodated in the memory hopper 20 _-1 to 20 _-n of 29 _-1 to 29 _-n
Is turned on when the objects to be weighed stored in the memory hoppers 20 _{-1 to} 20 _-n on one side are combined and selected and discharged,
A switch for resetting the storage contents of the weight memory unit 28 _-1 ~ 28 _-n "0".

30 _-1 to 30 _-n, the weight storage unit 28 _-1 ~ 28 _-n stored values and the measuring instrument 17 _-1 to 17 metric value from _-n an adder for outputting to the addition result adding, 31 _{-1 to} 31 _-n is the adder 30
_The addition value storage unit stores the addition output from _-1 to 30 _-n and outputs the stored value.

In the case of 32 _{-1 to} 32 _-n , the discharge gates 18 _-1 to 18 _-n on one side of the weighing hoppers 16 _{-1 to} 16 _-n are opened and the objects to be weighed are stored in the memory hoppers 20 _{-1 to} 20 _-n. When turned on,
The stored values of the added value storage units 31 _{-1 to} 31 _-n are stored in the weight storage unit 28.
_{-1 to} 28- _n are switches to be stored.

33 _{-1 to} 33 _-n compare the reference value from the reference value setting unit 47, which will be described later, with the storage values of the additional value storage units 31 _{-1 to} 31 _-n , and the storage value is greater than the reference value. When it is small, it is the “L” level, and conversely when the stored value is larger than the reference value,
This is a comparator that outputs "H" level.

34 _{-1 to} 34 _-n are "H" when the objects to be weighed are not stored in the weighing hoppers 16 _{-1 to} 16 _-n and the measured values from the weighing instruments 17 _{-1 to} 17 _-n are "0". Level, a zero detector that outputs "L" level when other than "0", 35 _{-1 to} 35 _-n ,
Outputs of the comparators 33 _{-1 to} 33 _-n and zero detectors 34 _{-1 to} 34 _-n
It is an OR circuit that takes the logical sum of the output and drives the switches 36 _{-1 to} 36 _-n .

The switches 36 _{-1 to} 36 _-n are turned on when the outputs of the OR circuits 35 _{-1 to} 35 _-n are at "L" level, and the added value storage unit 31
The stored value of _-1 to 31 _-n is delivered to the additional feeding hopper selection circuit 48, when the output of the OR circuit 36 _-1 ~ 36 _-n is at the "H" level, to prohibit the transmission of stored values.

The above arrangement, the memory hopper 21 _-1 to 21 on the other side
_{The same} applies to _-n .

That is, 38 _{-1 to} 38 _-n are the memory hoppers 21 _-1 on the other side.
Through 21 O _{when -n} discharge gate 23 _-1 ~ 23 _-n of is opened
The stored contents are reset to “0” by the switches 39 _{-1 to} 39 _{-n for} N, and the respective memory hoppers 21 _{-1 to} 21
_-n for storing the weight value of the object to be weighed, 40 _-1 to 40 _-n are the storage values of the weight storage units 38 _{-1 to} 38 _-n and the weighing instruments 17 _{-1 to} 17 _-It is an adder that adds the measured values from _n .

41 _{-1 to} 41 _-n are addition value storages that store the addition results from the adders 40 _-1 to 40 _-n , and 42 _{-1 to} 42 _-n are the weighing hoppers 16 _{-1 to} 16 _-n. Side memory hopper 21 _-1 ~
21 _-n is turned on when the object to be weighed is discharged and stored, and the stored values of the added value storages 41 _{-1 to} 41 _-n are stored in the weight storage 38 _-1.
This is a switch for storing in ~ 38 _-n .

43 _-1 to 43 _-n are reference value and added value storages 41 _{-1 to} 41
Comparing the stored value of _-n , 45 _{-1 to} 45 _-n are comparison outputs of the comparators 43 _-1 to 43 _-n and zero detectors 34 _{-1 to} 34.
_This is an OR circuit for controlling the switches 46 _{-1 to} 46 _-n by taking the logical sum with the output of _-n .

The switches 46 _{-1 to} 46 _-n are turned on when the outputs of the OR circuits 45 _{-1 to} 45 _-n are at the "H" level, and the added value storage unit 41
The stored values of _{-1 to} 41 _-n are sent to the additional input hopper selection circuit 48.

47, a predetermined reference value (for example, a combination setting weight values of the objects to be weighed) is a reference value setter which is set, the reference value, the comparator 33 of the storage operation circuit 27 _-1 ~ 27 _{-n -1 to} 3
It is output to 3 _-n , 43 _-1 to 43 _-n .

When the additional input signal A is input, the switch 48 of each memory operation circuit 27 _{-1 to} 27 _-n 36 _{-1 to} 36 _-n , 46 _-1 to 48-.
46 _-n input addition value storage units 31 _{-1 to} 3
Of the stored values from 1 _-n , 41 _{-1 to} 41 _-n , the memory hopper corresponding to the smallest stored value is selected, and the object to be weighed is additionally loaded from the weighing hopper corresponding to the selected memory hopper. It is an additional throw-in hopper selection circuit that outputs a selection signal for making it. The additional input hopper selection circuit 48 is composed of, for example, a microcomputer programmed with an operation for detecting the minimum value.

Reference numeral 49 is a discharge and supply control device for opening the discharge gate of the weighing hopper corresponding to the selection signal from the additional charging hopper selection circuit 48 and additionally charging the object to be weighed into the memory hopper. The discharge supply control device 49 opens the discharge gate of the memory hopper corresponding to the combination selection signal from the combination selection circuit 50, which will be described later, and the discharge gate of the weighing hopper corresponding to the empty memory hopper, as well as the additional charging operation. Further, the discharge gate of the intermediate hopper corresponding to the empty weighing hopper is opened, and the feeder corresponding to the intermediate hopper is driven to control the discharge and supply operation of the object to be weighed.

On the other hand, each weight storage unit 2 of each storage operation circuit 27 _{-1 to} 27 _-n
Stored values of 8 _{-1 to} 28 _-n , 38 _{-1 to} 38 _-n and measuring instrument 17
The measured values from _{-1 to} 17 _-n are sent to the combination selection circuit 50, the detection circuit 51, and the comparison circuit 52.

Each time the combination request signal B is input, the combination selection circuit 50 stores the stored values of the weight storage devices 28 _{-1 to} 28 _-n , 38 _{-1 to} 38 _-n and the weighing devices 17 _{-1 to} 17 _-n . Based on the measured value,
The individual weight of each object to be weighed for each memory hopper and the combined weight obtained by adding the weight of the objects to be weighed stored in the memory hopper to the weighed object in the weighing hopper corresponding to the memory hopper are used. All the combination calculations that have been performed, this combination weight is selected within the predetermined weight range that is closest to the set weight of the object to be weighed, and a selection signal corresponding to this combination is sent to the discharge supply control device 49, When the combination weight with respect to the set weight cannot be obtained, the combination impossible signal is output to the AND circuits 53 and 54.

The detection circuit 51 is the first detection means of this embodiment,
Each time the combination request signal B is input, each weight storage unit 28 _-1
~ 28 _-n , 38 _-1 ~ 38 _-n stored values and scale 1
Receiving weighing from 7 _-1 to 17 _-n, all this stored value and the weight value is not "0" (i.e., all of the weighing hoppers 16 _-1 ~ 16 _-n and memory hoppers 20 _-1 to Two
When the objects to be weighed are stored in 0 _-n , 21 _{-1 to} 21 _-n ) "H" level, and when any of the stored value and the measured value is "0", the "L" level is set to AND. Output to the circuit 53.

Therefore, the outputs of the AND circuits 53 are all the weighing hoppers 16 _{-1 to} 16 _-n and the memory hoppers 20 _{-1 to} 20 _-n , 21.
"H" only when the objects to be weighed are stored in _{-1 to} 21 _-n and the combination for the set weight of the objects to be weighed is not obtained.
It becomes a level.

The comparison circuit 52 includes an AND circuit 54, an inverter 55, a counter 57, a comparator 58, and a limit value setter 5 which will be described later.
9 together with the second detection means of this embodiment, each time the combination request signal B is input, which memory hopper the object to be weighed is detected and stored. If the previously stored memory hopper group and the currently detected memory hopper group match, an “H” level is output, and if they do not match, an “L” level is output to the AND circuit 54 and the inverter 55.

Therefore, the output of the AND circuit 54 is the same as that of the memory hopper group that contains the objects to be weighed at the time of the previous combination selection and the memory hopper group that contains the objects to be weighed at the time of the current combination selection. The level becomes "H" only when a combination for the set weight of the weighing object cannot be obtained.

The output of the AND circuit 53 is output to the OR circuit 56, and the output of one AND circuit 54 is output to the counter 57. The counter 57 counts and outputs the output from the AND circuit 54, and is reset by the output of the inverter 55.

The output of the counter 57 is input to the comparator 58. In the comparator 58, the output from the limit value setter 59 in which a predetermined limit value (for example, “3”) is set and the output value of the counter 57 are set. When the output of the counter 57 is equal to or more than the limit value, the "H" level is output to the OR circuit 56.

The "H" level output of the OR circuit 56 activates the additional input hopper selection circuit 48 as the additional input signal A.

<Operation of the Above Embodiment> Next, the operation of the above embodiment will be described.

In advance, all the intermediate hoppers 14 _{-1 to} 14 _-n weighing hoppers 1
6 _{-1 to} 16 _-n and memory hoppers 20 _{-1 to} 20 _-n , 21 _-1
If the objects to be weighed are not stored in ~ 21 _-n ,
Each of the feeders 13 _{−1 to} 13 is controlled by the discharge supply control device 49.
_-n is driven, the objects to be weighed supplied from the feeder 11 via the circular feeder 12 are supplied to the intermediate hoppers 14 _{-1 to} 14 _-n , and the respective discharge gates 15 _-1 to 15 _-n are opened. , Each of the weighing hoppers 16 _{-1 to} 16 _-n is accommodated.

The objects to be weighed which have been accommodated in the weighing hopper 16 _-1 ~ 16 _-n are meter 17 _-1 is metered by to 17 _-n, metric corresponding to the objects to be weighed which have been accommodated, each memory operation circuit 27 _{- 1}
~ 27 _-n .

Adders 30 _-1 to 30 _-n of the storage operation circuits 27 _{-1 to} 27 _-n ,
Each weight value input to 40 _-1 to 40 _-n is stored in the weight memory 2
8 _{-1 to} 28 _-n and 38 _{-1 to} 38 _-n are added to the stored values (in this case, "0") to add value storage units 31 _{-1 to} 3
1 _-n , 41 _{-1 to} 41 _-n are stored.

At this time, since the objects to be weighed are stored in all the weighing hoppers 16 _{-1 to} 16 _-n , the zero detectors 34 _-1 to
34 _-n output is at "L" level, comparators 33 _{-1 to} 33 _-n ,
The output of 43 _-1 to 43 _-n becomes "L" level, and the switches 36 _{-1 to} 36 _-n and 46 _{-1 to} 46 _-n are turned on, but the additional input is made until the additional input signal A is input. The hopper selection circuit 48 does not operate.

The objects to be weighed which have been accommodated in the weighing hopper 16 _-1 ~ 16 _-n is the exhaust supply controller 49, one side (e.g., left side) discharge gate 18 _-1 ~ 18 _-n is opened, the respective left memory It is accommodated in the hoppers 20 _{-1 to} 20 _-n .

With this accommodating operation, each memory operation circuit 27 _{-1 to} 27 _-n
Since the switches 32 _{-1 to} 32 _{-n of} are turned on, the stored values stored in the added value storage units 31 _{-1 to} 31 _-n are the weight values of the objects stored in the left-side memory hopper, respectively. It is stored in the storage device 28 _-1 ~ 28 _-n.

The weighing hopper 16 _-1 ~ 16 _-n emptied from the intermediate hopper 14 _-1 to 14 _-n are accommodated next objects to be weighed, the weighing value from the weighing devices 17 _-1 to 17 _-n Is an adder 30 _{-1 to} 3
It is output to 0 _-n , 40 _-1 to 40 _-n .

In the adders 30 _-1 to 30 _-n on one side, the weight memory 28 _-1
To 28 metric values and weight values of the objects to be weighed stored in _-n is added and stored in the respective sum value storage 31 _-1 to 31 _-n.

In addition, in the adders 40 _-1 to 40 _-n on the other side, the stored values (in this case, "0") of the weight storages 38 _{-1 to} 38 _-n and the measured value are added, and the added value storage 41 is respectively added. _{-1 to} 41 _-n are stored.

The objects to be weighed accommodated in the weighing hoppers 16 _{-1 to} 16 _-n are opened by the discharge supply control device 49 on the other side (right side) of the discharge gates 19 _{-1 to} 19 _-n and the right side memory hopper 21 _-1.
~ 21 _-n respectively.

At this time, the switch 4 of each memory operation circuit 27 _{-1 to} 27 _-n
Since 2 _{−1 to} 42 _−n are turned on, the added value storage units 41 ₋₁ to 4
The stored values stored in 1 _-n are stored in the right memory hopper 21 _-1 ~
The weight values of the objects stored in 21 _-n are stored in the weight storage units 38 _{-1 to} 38 _-n , respectively.

Also during this time, the objects to be weighed supplied from the feeders 13 _{-1 to} 13 _-n to the respective intermediate hoppers 14 _{-1 to} 14 _-n are stored in the empty weighing hoppers 16 _{-1 to} 16 _-n. Then, the respective measured values are added to the adders 30 _-1 to 30 _-n and 40 _-1 to 40, respectively.
_-n and the combination selection circuit 50.

The stored values of the weight storage devices 28 _{-1 to} 28 _-n and 38 _{-1 to} 38 _-n are sent to the combination selection circuit 50 together with the measured values from the weighing devices 17 _{-1 to} 17 _-n , and a combination request signal is sent. When B is input, a combination of combination weights closest to the set weight of the object to be weighed within a predetermined range is selected.

If, for example, the objects to be weighed stored in the weighing hopper 16 _-1 and the objects to be weighed stored in the memory hopper 20 _-1 are selected as a combination in this combination selection, the combinations corresponding to these hoppers are selected. Selection signal is emission supply control device 4
9 is sent.

Upon receipt of this combination selection signal, the discharge supply control device 49 opens the discharge gates 18 _-1 , 22 _-1 of the selected hopper.

As a result, as shown in FIG. 3, the objects to be weighed in the weighing hopper 16 _-1 selected for the combination are collected together with the objects to be weighed in the memory hopper 20 _-1 selected in the combination.
It is dropped to 9, and it is put together in the timing hopper 25 together with the other objects to be weighed which are selected in combination, and is packed by the packing machine 26.

At this time, the switch 29 _-1 of the memory operation circuit 27 _-1 is turned on.
Then, the stored value of the weight storage unit 28 _-1 is reset to "0".

Even during this discharging operation, the weighed hopper that has become empty receives the objects to be weighed from the intermediate hopper, and the empty memory hopper stores the objects to be weighed, and the weight of the stored objects to be weighed. The value is stored in the weight storage device corresponding to the accommodated memory hopper in the same manner as described above, and the next combination selecting 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.

Here, for example, when the supply amount of the objects to be weighed supplied from the feeders 13 _{-1 to} 13 _-n is extremely changed and becomes small,
When the combination selection circuit 50 cannot obtain the combination weight that is closest to the set weight of the object to be weighed within the predetermined range, the combination selection circuit 49 outputs an "H" level uncombinable signal to the AND circuits 53 and 54. .

At this time, when all the weighing hoppers 16 _{-1 to} 16 _-n and the memory hoppers 20 _{-1 to} 20 _-n , 21 _{-1 to} 21 _-n contain the objects to be weighed, the output of the detection circuit 51 becomes "H". Then, the output of the AND circuit 53 becomes "H" level and the OR circuit 56 inputs the additional input signal A to the additional input hopper selection circuit.

At this time, the weight of the storage operation circuit 27 in _-1 ~ 27 _-n, and weighing of the weighing hoppers which objects to be weighed are accommodated, the objects to be weighed which have been accommodated in the right and left of the memory hopper corresponding to that weighing hopper The added value and the added value are compared with the reference value of the reference value setting unit 47, and only the added value smaller than the reference value is input to the additional charging hopper selection circuit 48.

Therefore, when the additional feeding hopper selection circuit 48 receives the additional feeding signal A, the smallest addition value is detected from the input addition values, and the memory hopper corresponding to this minimum addition value is selected and selected. A signal is sent to the discharge supply control device 49.

Here, for example, when the added value of the added value storage unit 31 _-1 is selected as the minimum added value, the additional feeding hopper selection circuit 48
By the discharge supply control device 49 receiving the selection signal from
Discharge gate 18 _-1 weighing hoppers _216-1 corresponding to the memory hopper 20 _-1, which is the selected is opened, the weighing hoppers 16
_The objects to be weighed in _-1 are additionally loaded into the memory hopper 20 _-1 .

At this time, the switch 32 _-1 is turned on, and the stored value of the added value storage unit 31 _-1 having the minimum added value is the weight value of the object to be weighed stored in the additionally supplied memory hopper 20 _-1 . Is stored in the weight storage device 28 _-1 .

The emptied weighing hopper 16 _-1 stores a new object to be weighed from the intermediate hopper 14 _-1 , and the measured value is sent to the combination selection circuit 50 together with the stored value of the weight memory 28 _-1. .

As a result, the combination selecting operation by the combination selecting circuit 50 is started, and when the combination by the combination selecting operation is obtained, the objects to be weighed are discharged from the weighing hopper and the memory hopper which are selected in the same manner as described above, and the collecting chute 2
4 and the timing hopper 25, and is discharged to the packaging machine 26.

If the combination by the combination selection circuit 50 is not obtained, the additional input signal A is sent again to the additional input hopper selection circuit 48, and similarly, the objects to be weighed are additionally input to the selected memory hopper, The weighing value of the object to be weighed newly stored in the empty weighing hopper is selected by the combination selection circuit 50.
And the combination selection operation is performed.

Further, when the objects to be weighed from the circular feeder 12 are not evenly supplied to the respective feeders 13 _{-1 to} 13 _-n , as when the production is about to end, if they are unevenly supplied, only to a specific memory hopper group. The objects to be weighed will be accommodated.

In such a state, when the optimum combination of the objects to be weighed by the combination selection operation cannot be obtained three times at the limit value in succession, the additional input signal A from the comparator 58 via the OR circuit 56 is input to the additional input hopper selection circuit 48. , And the additional selection as described above is made to any of these specific memory hoppers, and then the combination selecting operation is performed again.

As described above, additional charging is performed and the combination discharging operation is continued until the combination weight close to the set weight within the predetermined range is obtained.

<Other embodiments of the present invention> In the above embodiment, based on the weight value of the object to be weighed,
Although the selection of the combination and the selection of the additional feeding hopper were performed, the selection may be performed based on not only the weight value but also the number value obtained from the weight value or the weight value and the number value. .

Further, in the above example, the added value of the weight value of the object to be weighed stored in the weighing hopper and the weight value of the object to be weighed stored in the memory hopper are compared, and the memory hopper corresponding to the minimum added value is compared. I was adding an object to be weighed to the
The addition value is not limited to the minimum addition value, and may be, for example, the maximum addition value or an intermediate addition value, and the objects to be weighed may be additionally loaded into a plurality of memory hoppers at the same time.

Further, in the above-mentioned embodiment, the reference value of the reference value setting device 47 is the set weight value of the object to be weighed, but this may be set to a value equal to or less than the set weight, or the measurement limit value of the measuring device. And so on.

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

<Effects of the Present Invention> As described above, the combination weighing device of the present invention, when the optimum combination for the set amount cannot be obtained by selecting the combination of the objects to be weighed stored in the weighing hopper and the memory hopper, A memory that satisfies a predetermined condition even if the added value of the weight of the object to be weighed stored in the hopper and the weight of the weighed object to be weighed in the weighing hopper corresponding to this memory hopper falls below a predetermined reference value. To the hopper, add the weighed object that has already been weighed from the weighing hopper, store the new object to be weighed in the weighing hopper, weigh it, and then select the combination to obtain the optimum combination for the set amount. I have to.

For this reason, the weight of the articles in the memory hopper after the additional charging does not become excessive, and it is not necessary to generate the memory hopper that cannot participate in the combination.

In addition to the case where the objects to be weighed are stored in all the memory hoppers, the optimum combination is continuous when the objects to be weighed are stored only in some of the specific memory hoppers due to uneven supply conditions. Then, when it is not possible to select a predetermined number of times, additional charging is performed, so that unnecessary additional charging can be avoided.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention, and FIG.
FIG. 3 is a block diagram showing a control unit of one embodiment, FIG. 3 is a schematic diagram showing the operation of one embodiment, and FIG. 4 is a schematic diagram showing a conventional combination weighing device. 16 _-1 ~16 _-n ...... weighing hoppers, 17 _-1 ~17 _-n ...... _{meter, 20 -1 ~20 -n, 21 -1} ~21 -n ...... memory hoppers, 27 _-1 to 27 _{- n} ... memory operation circuit, 28 _{-1 to} 28 _-n
...... Weight memory, 30 _-1 to 30 _-n ...... Adder, 31 _-1 to
31 _-n ... addition value memory, 33 _{-1 to} 33 _-n ... comparator,
38 _{-1 to} 38 _-n ...... weight storage device, 40 _-1 to 40 _-n ...... adder, 41 _{-1 to} 41 _-n ...... addition value storage device, 43 _-1 to 43
_-n …… Comparator, 47 …… Reference value setting device, 48 …… Additional input hopper selection circuit, 49 …… Supply and discharge control device, 50 ・ ・ ・
... Combination selection circuit, 51 ... Detection circuit, 52 ... Comparison circuit, 57 ... Counter, 58 ... Comparator, 59 ... Limit value setting device.

Claims (1)

[Claims] 1. A plurality of weighing hoppers for storing objects to be weighed, a plurality of weighing devices for respectively detecting the weight of the objects to be weighed stored in the plurality of weighing hoppers, and one for each of the plurality of weighing hoppers. Alternatively, a plurality of memory hoppers are provided, each of which is provided with a plurality of objects to be weighed, which are selectively discharged from the corresponding weighing hopper, and each of the plurality of memory hoppers is provided corresponding to each of the plurality of memory hoppers.
A plurality of weight storages for respectively storing the weight values of the objects to be weighed stored in the plurality of memory hoppers based on the weighing values of the weighing device; and a weighing device of the weighing hopper in which the objects to be weighed are stored. Calculation means for respectively adding the weight value from the weight hopper and the weight value of the object to be weighed already stored in the memory hopper corresponding to the weighing hopper, and a predetermined reference value among the addition values calculated by the calculation means. An additional value selecting means for selecting an additional value less than or equal to a value, and weight values stored in the plurality of weight storage devices and weight values from the plurality of weighing devices, and already stored in the plurality of memory hoppers. The individual weight of each weighing object and the combined weight of the weighing object stored in the memory hopper and the weighing object in the weighing hopper corresponding to the memory hopper A combination selecting means for selecting the closest optimum combination and discharging the objects to be weighed selected in the combination from the memory hopper and the weighing hopper, and the weighed objects which have been weighed in all of the plurality of weighing hoppers and the plurality of memory hoppers. First detection means for detecting that the optimum combination cannot be selected by the combination selection means in a state where the objects to be weighed are accommodated, and some specific memory hoppers among the plurality of memory hoppers have been weighed Second detection means for detecting that the optimum combination cannot be continuously selected by the combination selection means for a predetermined number of times while the objects to be weighed are contained; and the first detection means or the second detection means. When receiving the detection signal from the detection means, the memory hopper corresponding to the addition value satisfying a predetermined condition is selected from the addition values from the addition value selection means. The memory hoppers which are the selected, corresponding combination weighing device provided with an additional feeding hopper selecting means for adding-on a weighed objects to be weighed from the weighing hoppers.