JPH0587766B2 - - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial Application Field] The present invention is applicable to confectionery, fruits,
It is used when packing items such as vegetables, which vary in individual weight, into bags so that the weight is approximately constant.
It relates to a combination weighing device.

[0002]

2. Description of the Related Art Even if an attempt is made to group together a plurality of objects to be weighed whose individual weights vary by a set weight, an error occurs between the set weight and the set weight. This error becomes more significant as the average weight of each object to be weighed increases.

[0003] As a solution to this problem, a combination weighing device as shown in FIG. 4 has conventionally been used.

[0004] That is, in this combination weighing device, a plurality of objects to be weighed corresponding to approximately a fraction of the set weight are sequentially supplied to a plurality of weighing hoppers 1 ₁ to 1 _o ,
Each weighing hopper 1 ₁ ~ ₁ Measuring device installed at each o 2 ₁
~2 _o Weigh the plurality of objects to be weighed, respectively. Then, based on the outputs of the weighing devices 2 ₁ to 2 _o , the combined weight of the object to be weighed based on a predetermined number of combinations of weighing hoppers is calculated for all different combinations. Among these combinations, the combination with the smallest difference from the set weight is determined, and the objects to be weighed in the weighing hopper of this combination are dropped and discharged and collected together.

[0005] Regarding the combination discharge operation of the conventional combination weighing device having such a configuration, a case will be described below in which there are, for example, 10 sets of weighing hoppers and weighing instruments, and a combination is set using four weighing hoppers.

[0006] As shown in FIG. 5a, first A1 to A
A plurality of objects to be weighed are stored in each of the ten weighing hoppers and weighed. Next, the weight is calculated using ₁₀ C ₄ =210 combinations of 4 weighing hoppers out of the 10, and the combination closest to the set weight is determined. As a result, for example, A1, A3, A6, A
10 are selected, the contents of these weighing hoppers are discharged and collected, as shown in Figure 5b.

[0007] However, in order to refill the weighing hopper with the object to be weighed after discharging and weighing it, a considerable amount of time is required for supply and stabilization of the weighing hopper. Therefore, it is extremely inefficient to wait for the weighing hopper to be refilled and weighed after discharging before performing the next combination. Therefore, the remaining six metering hopper output combinations are determined during refilling of A1, A3, A6, and A10, as shown in FIG. 5c. For example, if A2, A5, A7, and A8 are selected, Figure 5
As shown in d, the contents of these weighing hoppers are discharged and collected. During this time, A1, A3, A6,
Since A10 is filled, next, as shown in Fig. 5e, the combination is determined using six weighing hoppers excluding A2, A5, A7, and A8, and as shown in Fig. 5f, the selected four The contents are discharged and collected from the weighing hopper. Thereafter, the same operation is repeated.

[0008] However, since there are only ₆ C ₄ = 15 combinations of taking 4 out of 6,
It is difficult to obtain a combination with a small difference from the set weight, and accuracy deteriorates significantly. Therefore, in order to obtain high efficiency and high precision, it was necessary to increase the number of measuring instruments, feeders, etc. (generally at least 14 sets or more in the past).

[0009] However, since measuring instruments and the like are expensive, if the number is increased, there is a drawback that the entire device becomes extremely expensive. In addition, since the measuring instruments always require adjustment, an increase in the number of measuring instruments results in complicated maintenance, which also has the disadvantage of deteriorating the reliability of measurement.

[0010] The present invention aims to correct the above-mentioned drawbacks and provide a combination weighing device that enables highly efficient and highly accurate combination weighing without increasing the number of weighing instruments.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the combination weighing device of the present invention includes a plurality of weighing instruments, and objects to be weighed are accommodated separately in association with each of the weighing instruments. A plurality of storage sections are provided integrally connected and the total weight of the objects to be weighed is measured by one corresponding weighing device; a discharge gate for dropping the discharge; and a first discharge gate for storing the total weight output from the weighing device.
and the total weight of the object to be weighed placed in the one storage section, based on the total weight stored in the first storage means before the object to be weighed is put into the one storage section and the total weight after the object to be weighed is put into the storage section. a calculation means for calculating a weight value of the object; and a second memory for storing the weight value of the object to be weighed in each storage section calculated by the calculation means in association with each storage section based on the operation of the discharge gate. means, a combination of calculating a combination weight from measured values corresponding to the plurality of storage parts stored in the second storage means, selecting a combination, and operating the discharge gate of the selected corresponding storage part; and an emission control means.

[0012]

[Operation] Therefore, in this combination weighing device, objects to be weighed are separately received in a plurality of storage sections for one measuring device, and the first measurement by the measuring device is performed before putting the objects to be weighed into one storage section. Calculates the weight value of the object to be weighed in the storage section from the total weight stored in the storage means and the total weight after putting the object to be weighed, and stores the weight value in association with each storage section in the second storage means. The combinations are memorized, and the combinations are selected and the discharge gates of these containers are directly operated to discharge and collect them.

[0013]

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

[0014] FIGS. 1 and 2 show an embodiment of the present invention.

[0015] In FIG. 2, 11 is a feeder that sequentially supplies objects to be weighed to a circular feeder 12. N intermediate hoppers 14 ₁ to 14 _o are arranged in a circle below the periphery of the circular feeder 12, and a plurality of objects to be weighed are sequentially supplied via the respective feeders 13 ₁ to 13 _o .

[0016] Below the intermediate hoppers 14 ₁ - 14 _o , there are two storage parts 16 ₁ , 16 ₂ - 16 _{2 o,} respectively.
A weighing hopper consisting of _-1 , 16 _2o is arranged. The objects to be weighed stored in the intermediate hoppers 14 ₁ to 14 _o are discharged through the discharge gates 15 ₁ , 15 ₂ to 15 _{2 o-1} , 1
When opening 5 _2o , the housing parts 16 ₁ , 16 ₂ ~ 1
6 _2o-1 and 16 _2o were dropped and contained.

[0017] Two storage parts 16 ₁ , 16 ₂ to 16 _2o-1 , each provided as a receiving place for objects to be weighed.
16 _2o each has one measuring instrument 17 ₁ to 17 _o
is set, and the weight of the contents in either of the two storage sections is detected by one measuring device.

[0018] FIG. 1 shows an example of the configuration of a weighing hopper consisting of two storage parts. That is, the pair of accommodating portions 16 _a and 16 _a+1 have an integral structure, and a load is applied to the measuring instrument 17 a as a whole.

[0019] Therefore, the pair of storage parts _16a , 1
6 Store the object to be weighed in only one of _a+1 and weigh it to detect the weight, then store the object in the other storage section and calculate the total weight of the objects stored in both storage sections. By detecting and subtracting the weight of one container, the weight of the object in the other container can also be detected.

[0020] In FIG. 1, _18a , 18a+
1 _a is a discharge gate provided in each of the accommodating portions 16 _a and 16 _a+1 , respectively.

[0021] Discharge gates 15 ₁ to 15 _2o , 18 ₁ to 1
8 _2o is the discharge gate control device 23 of the control device 22
Opening/closing is controlled by

[0022] The objects to be weighed that are discharged from the respective object receivers 16 ₁ to 16 _2o are collected by falling onto a conveyor (not shown), for example, or are received by a box or a net and collected together. be done.

[0023] The weighing signals from the scales 17 ₁ to 17 _o are sent to the first storage circuit 24 of the combined discharge control device 22. Based on the total weight stored by the first storage circuit 24 when only one of the pair of storage sections is in the storage state of the object to be weighed, and the total weight when the other storage section is also in the storage state, the arithmetic circuit 27 calculates the weight of the other storage section. Calculate the weight of the object to be weighed. The second storage circuit 28 stores the weight of the object to be weighed in association with each of the pair of storage sections. The discharge gate control device 23 sends to the second memory circuit 28 a signal indicating which of the two discharge gates 15 provided for each intermediate hopper 14 has been opened. For this reason, the second
The storage circuit 28 stores the respective weights of the objects to be weighed accommodated in the accommodation units 16 _{1 to} 16 _2o .
6 Store _{each 2o} in association with each other.

[0024] The combination selection circuit 25 selects the items to be weighed by combining a predetermined number of storage units based on the weight signal of the items stored in each of the storage units 16 ₁ to 16 _2o stored in the second storage circuit 28. A combination calculation section 25a that calculates the combination weight for all different combinations, a weight setting section 25b that stores the setting weight, and a combination weight output of the combination calculation section 25a and the weight setting section 2.
The determination unit 25c compares the set weight output of the unit 5b with the set weight output, determines the combination of housing portions that has the smallest difference from the set weight, and outputs a combination selection signal.

[0025] Upon receiving the combination sorting signal, the discharge gate control device 23 opens a designated gate among the discharge gates 18 ₁ to 18 _2o of the storage units 16 ₁ to 16 _2o , and discharges the object to be weighed. After that, the gate is closed and the discharge gate of the intermediate hopper to the storage section where the discharged material has already been discharged is opened.

[0026] When the supply control device 26 receives a signal from the discharge gate control device 23 indicating whether the discharge gates of the intermediate hoppers 14 ₁ to 14 _o have been opened, the supply control device 26 supplies the feeder 11, the circular feeder 12, and the feeders 13 ₁ to 13 _o.
intermediate hoppers 14 ₁ to 14 _o that have been discharged by driving
Supply the object to be weighed to either of the

[0027] Next, the operation of the combination weighing device according to the above embodiment will be explained.

[0028] A plurality of objects to be weighed are stored in the intermediate hoppers 14 ₁ - 14 _o via the feeder 11, the circular feeder 12, and the feeders 13 ₁ - 13 _o , and first, one of the discharge gates 15 ₁ , 15 ₃ , ......, 15 _2o-1 is opened and the contents are placed in one of the storage sections 16 ₁ , 16 ₃ , ...
..., 16 Drop it into _2o-1 and weigh it. The intermediate hoppers 14 ₁ to 14 _o accommodate the objects to be weighed again, and then the other discharge gates 15 ₂ , 15 ₄ , . . .
..., 15 Open _{the 2o} and place the stored items in the other storage section 16.
₂ , 16 ₄ , ..., 16 _2o and weigh it.

[0029] In this way, all the storage units 16
A plurality of objects to be weighed are accommodated in each of ₁ to 16 _2o ,
Based on the weight signals from the scales 17 ₁ to 17 _o , the weights of the items stored in each of the storage sections 16 ₁ to 16 _{2 o} are stored in the second memory by the first storage circuit and the arithmetic circuit 27 as described above. stored in circuit 28.

[0030] Combination calculation unit 2 of combination selection circuit 25
In step 5a, the combined weight of a predetermined number of combinations of accommodating parts is calculated for all different combinations based on the stored weight signals.

[0031] In the determining section 25c, the weight setting section 25b
A combination of accommodating parts that has the smallest difference from the set weight set in is determined, and a combination selection signal is sent to the discharge gate control device 23. The discharge gate control device 23 opens the discharge gate of the accommodating section designated by the combination sorting signal and causes the container to fall and discharge. The objects to be weighed, for example, are collected by falling onto a conveyor (not shown), or are collected in a box or a net.

[0032] When the storage section becomes empty, the contents in the intermediate hopper are discharged to the storage section, but during this time, combinations are similarly sorted by the remaining storage sections and are dropped and discharged.

[0033] In this way, the objects to be weighed are sequentially stored in the storage section that has already been discharged, and a combination is discharged, and for example, the objects are dropped onto a conveyor and collected, or
Or they are collected together in boxes or nets.

[0034] For example, if there are 10 measuring instruments, the number of accommodating parts is 20, A1 to A20, as shown in FIG. It is assumed that four storage parts are used in combination.

[0035] As shown in FIG. 3a, first A1~
As described above, each of the storage sections of A20 stores a plurality of objects to be weighed, and the combination weight is calculated using 20 C ₄ = 4845 combinations of ₂₀ C 4 = 4845 combinations, and the most set weight is calculated. Determine combinations that are close in weight. As a result, for example, A5, A8, A12, A
13 is selected, the contents of these storage sections are discharged, as shown in FIG. 3b.

[0036] Next, as shown in FIG. 3c, A5,
A combination of taking 4 out of the remaining 16 compartments during refilling of A8, A12, and A13, ₁₆ C ₄ =
The combination is determined by calculating the combination weight for 1820 combinations. For example, A2, A9, A11, A
18 is selected, the contents of these storage sections are discharged and collected as shown in d of FIG. During this time, A5, A8, A12, and A13 are filled, so next, as shown in FIG.
Combinations are determined among the 16 accommodating sections excluding 9, A11, and A18, and the stored items are discharged from the selected 4 accommodating sections, as shown in FIG. 3F. Thereafter, similar combined discharge is performed while repeating discharge and filling.

[0037] For example, like A1 and A2,
When a pair of containers provided in the same meter are combined, A1 and A2 must be refilled at different times. In this case, for example, even if A1 is refilled, as long as A2 is not refilled, combinations are determined based on 15 accommodating parts instead of 16 accommodating parts.

[0038] In this way, in the combination weighing device of the above embodiment, as is clear from the comparison between FIG. 3 and FIG. Number (2 at the starting point)
Since combinations can be selected from double the number of objects, the number of combinations also increases significantly. Therefore, it is possible to obtain a larger number of combinations even if the number of scales is smaller than that of the conventional device. Therefore, a combination weight with an extremely small difference from the set weight can always be obtained, and the combination accuracy is significantly improved.

[0039] In addition, in the above embodiment, the case where two accommodating parts are provided for one measuring instrument is illustrated, but
It is also possible to use three or more, and if the number is three or more, the number of combinations will further increase. Therefore, a large number of combinations can be obtained even with a smaller number of measuring instruments.

【0040】

[0041] Further, the intermediate hopper may be omitted and the material may be directly supplied from the feeder, or any other method of supply may be used.

【0042】

[Effects of the Invention] Since the combination weighing device of the present invention is configured as described above, it has the following effects.

[0043] (1) Even if the number of measuring instruments is reduced, a large number of combinations can be obtained, so the price of the device is reduced and the accuracy is improved.

[0044] (2) Since the number of measuring instruments can be reduced, maintenance becomes easier and reliability of measurement is improved.

(3) There is no collection chute below the object to be weighed, so you can freely receive it on a conveyor, in a box, a net, or by hand, depending on the type of object to be weighed. You can choose a collection form.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a housing section according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing the entire embodiment of the present invention.

FIG. 3 is an explanatory diagram of the operation of an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a conventional combination weighing device.

FIG. 5 is an explanatory diagram of the operation of a conventional combination weighing device.

[Explanation of symbols]

11... Feeder 12... Circular feeder 13 ₁ to 13 _o ... Feeder 14 ₁ to 14 _o ... Intermediate hopper 15 ₁ to 15 _o ... Discharge gate 16 ₁ to 16 _2o ... Storage section 17 ₁ to 17 _o ...Measuring instrument 18 ₁ to 18 _2o ... Discharge gate 22 ... Combination discharge control device 23 ... Discharge gate control device 24 ... First memory circuit 25 ... Combination selection circuit 26 ... Supply control device 27 ... Arithmetic circuit 28...second storage circuit.

Claims (1)

[Claims] 1. A plurality of weighing instruments, and one weighing instrument that is integrally connected to accommodate the objects to be weighed in association with each of the weighing instruments, and whose total weight corresponds to the total weight of the objects to be weighed. a plurality of storage units to be weighed by the weighing device; a discharge gate provided for each of the storage units to allow the objects to be weighed in the storage units to fall and be discharged; and a storage unit for storing the total weight output from the weighing device. 1
and the total weight of the object to be weighed placed in the one storage section, based on the total weight stored in the first storage means before the object to be weighed is put into the one storage section and the total weight after the object to be weighed is put into the storage section. a calculation means for calculating a weight value of the object; and a second memory for storing the weight value of the object to be weighed in each storage section calculated by the calculation means in association with each storage section based on the operation of the discharge gate. means, a combination of calculating a combination weight from measured values corresponding to the plurality of storage parts stored in the second storage means, selecting a combination, and operating the discharge gate of the selected corresponding storage part; A combination metering device comprising emission control means.