JPH0249448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weighing method for filling a container with articles whose individual weights are not constant, such as pieces of meat and pieces of vegetables.

Conventionally, methods for automatically filling containers with articles of varying weight as described above have used a table feeder or a rotary feeder.
This method only allows filling, and the filling weight cannot be controlled. Therefore,
In order to improve the accuracy of the filled weight, the filled container must be weighed and the weight must be corrected manually based on the weighing results, resulting in low work efficiency.

The object of the present invention is to provide a weighing method that can fill containers with articles with high accuracy of filling weight and high work efficiency. The container is transferred to the fine filling position, and a combination calculation is performed with the rough filling measurement signal always included in the measurement signal from the fine filling measuring tank installed near the fine filling position, and the container is transferred from the fine filling measuring device corresponding to the calculation result. The container is filled with goods.

The present invention will be explained below based on one embodiment shown in the drawings. In Figure 1, 2 is an inlet conveyor;
The container 4 thus sent is conveyed to the lower part of the rough filling hopper 8 by the next stage conveyor 6. Here, the container 4 is roughly filled with articles from the rough filling hopper 8 . Of course, the individual weights of these articles are not constant. The roughly filled containers 4 are conveyed by the weighing conveyor 10 to below the collecting hopper 12, where the roughly filled articles are weighed. Moreover, fine filling measuring tanks 13 to 16 are provided above the collecting hopper 12. These precision filling weighing tanks 13 to 16 weigh articles whose individual weights are not constant.

As shown in FIG. 2, the rough filling weighing signal of the weighing conveyor 10 is directly supplied to the adder 18, and the weighing signals of the fine filling weighing tanks 13 to 16 are fed to the normally open switch 1.
9 to 22 to the adder 18. These normally open switches 19 to 22 are connected to the combination generator 2
The opening/closing is controlled by 4. That is, the combination generator 24 is constituted by a four-stage binary counter, and the normally open switch 19 is closed during the period when the output of the first stage of the combination generator 24 is at the signal level. 20 to 22 are closed during the period when the outputs of the second, third, and fourth stages of the combination generator 24 are each at H level. Therefore, by incrementing each stage of the combination generator 24 in turn, it is possible to combine (2 4 -1) precision filling measurement signals, and the output of the adder 18 has ( ^{2 4} -1) each precision filling measurement signal. A combination of one fine fill metering signal plus each coarse fill metering signal is generated.

The output of the adder 18 is sequentially supplied to a determination circuit 26, where it is compared with the upper limit weight set in the upper limit weight setter 27 and the lower limit weight set in the lower limit weight setter 28. When the weight reaches a value between the upper limit weight and the lower limit weight, the determination circuit 26 stores each stage of the combination generator 24 corresponding to each stage of the combination generator 24 at that time. Store the stage output. At the same time, the upper limit weight of the upper limit weight setter 27 and the output of the adder 18 at that time are updated. When the output of the adder 18 reaches a value between the new upper limit weight and the new lower limit weight, the stored value of the combination storage 29 is updated to the output of each stage of the combination generator 24 at that time, and at the same time the upper limit weight is The set value of the weight setter 27 is updated to the output of the adder 18 at that time. Repeat this from now on.
Therefore, when all the combinations are completed, among the stages of the combination storage 29, the stage corresponding to the precision filling measuring tank that constitutes the combination that is equal to or closest to the lower limit weight becomes H level. Precise filling measuring tank 1
Among the items 3 to 16, the items corresponding to the H level of the combination storage 29 are filled into the container 4 via the collection hopper 12.

The container 4 that has been filled with the fine filling measuring tank is transported to the next process by the transport conveyor 30 shown in FIG. Note that the supply hopper 31 is used for filling the container 4 among the fine filling measuring tanks 13 to 16.
34, new articles are placed in the tank located above the filled precision filling weighing tank in preparation for the next combination weighing.

According to this weighing method, the container 4 is roughly filled, the rough filling weight is detected, the weighing signals of the fine filling weighing tank are variously combined, and the rough filling weighing signal is added to each combined weighing signal. A combination that is equal to or closest to the lower limit weight is selected, and the container 4 is precisely filled from the precision filling measuring tank related to that combination, and the filling weight to the container 4 is controlled with high precision. Therefore, manual weight correction is not necessary, and work efficiency is increased. Moreover, according to this measuring method, the measuring accuracy can be greatly improved. That is,
Conventionally, in many measuring methods in which fine filling is performed after rough filling, filling is performed by dropping articles from above the container. This is to simplify the filling equipment. Precise filling is carried out by weighing the articles being filled, and stopping the precision filling when the measured value becomes equal to a comparison value that is set small in advance by taking into account the difference in head from the target value. There are many things to do. When fine filling is stopped, the article that was falling between the fine filling machine and the container (the weight of this article is called the head difference) has finished falling into the container.
This becomes the target value. However, this difference in head changes from time to time depending on various factors such as the state in which the article is stored in the precision filling device, and sometimes filling is stopped when the weight during precision filling becomes equal to the comparison value. If the filling is stopped, even if filling is stopped when the weight of the target value has been successfully supplied to the container, and the weight is relatively equal at another time, the product may not be able to be supplied according to the target value. Unless the head difference is corrected frequently, highly accurate measurements cannot be made.

However, in this weighing method, although the supply of articles during fine filling is still carried out by dropping the articles, the determination of the fine filling weight is carried out using a so-called combination scale. Therefore, when dropping an article with a precise filling weight toward a container, the weight of the article to be dropped has already been determined, and there is no need to accurately fill the container in anticipation of the difference in drop, which can improve measurement accuracy. . Further, there is no need to correct the head difference.

In the above embodiment, the containers 4 are transferred to each conveyor 2,
6, 10, and 30, it is possible to use other conveyance devices. Furthermore, although the roughly filled containers 4 are weighed at the lower part of the collecting hopper 12, the conveyor 6 at the lower part of the rough filling hopper 8 may be used as a weighing conveyor, and the weighing may be carried out at the lower part of the filling hopper 8. 10 may be a normal conveyor, a weighing conveyor may be provided between the normal conveyor and the conveyor 6, and the weighing may be performed using this weighing conveyor. Further, although the number of precision filling measuring tanks is four, the number can be increased or decreased as appropriate. Further, for the combination measurement, a combination equal to or closest to the lower limit value is selected, but a combination equal to or closest to the upper limit value may be selected.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a device used in the measuring method according to the present invention, and FIG. 2 is a block diagram of the same device. 2, 6, 30...conveyor, 4...container, 8...
...Rough filling hopper, 10...Measuring conveyor, 13 to 16...Fine filling measuring tank, 18...Adder, 24
... Combination generator, 26 ... Judgment circuit, 29 ...
Combinatorial memory.

Claims (1)

[Claims] 1 The process of roughly filling containers with articles, the process of transporting the containers to the fine filling position, the process of measuring the rough filling weight at the rough filling position, the fine filling position, or a position between them, Various combinations of weighing signals from a plurality of fine filling weighing tanks provided above near the filling position result in a value equal to or close to a predetermined value, which is obtained by adding the coarse filling weight signal to each combined weighing signal. A weighing method comprising the steps of selecting a combination from the above combinations, and dropping an article into the container from the fine filling weighing tank corresponding to the selected combination.