JPH031101Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention measures the weight of a predetermined number of items to be packed into packages such as bags and boxes (hereinafter referred to as packages), and then packs them into the packages. Regarding a weight sorting machine that sorts out whether or not the number of packed products is insufficient, in particular, it is possible to automatically correct a reference weight value that is a standard for number sorting every time a predetermined number of packaged products are weighed. Regarding a weight sorting machine that can.

[Conventional technology]

When selling a product packed with a predetermined number of items, it is necessary to check the number of items to ensure that the packaged product is packed with a predetermined number of items, and to ensure that the total weight is within the specified weight range. You must check the weight of what is inside.

For this reason, we measure the weight of the packaged product, compare this measured weight value with a predetermined standard weight value, and if the weight value of the packaged product is outside the allowable weight range of the standard weight value In this case, it is determined that a predetermined number of items are not packed, and the items are removed.

However, during the product manufacturing process, the weight per item may vary due to changes in various conditions such as measurement accuracy, variations, and changes in ambient temperature, but even in this case, it is possible to ensure that the specified number of items is must be packed.

Therefore, conventionally, a measuring means for measuring the weight of the packaged product, a setting means for presetting a reference weight value, an upper limit permissible weight value and a lower limit permissible weight value permissible with respect to the reference weight value, and a measuring means for measuring the weight of the packed product, and a determination means for determining whether the weight value of the packaged product measured by the means is within the permissible range. was making a judgment.

[Problem that the invention attempts to solve]

However, in conventional weight sorting machines that determine whether the weight of packaged products is within the allowable weight range, even if the number of items in one package is not the specified number, the total weight is within the allowable weight range. In some cases, the packaged product was judged to be a good product.

Therefore, the present invention provides a weight sorter with a function (hereinafter referred to as a tracking function) that automatically corrects the reference weight value in accordance with changes in measurement conditions. Therefore, it is an object of the present invention to provide a weight sorting machine that can always determine whether a plurality of articles are packed in the correct number as packed products even if the weight of each article changes, and can also check the total weight. The purpose is

[Means for solving problems]

FIG. 1 is an overall functional block diagram showing the configuration of the present invention.

In Fig. 1, 1 is a measuring means for measuring the weight of the packaged product, 2 is a reference weight value G, and an upper limit allowable weight value HG ₁ and a lower limit allowable weight value having constant widths α and β with respect to the reference weight value G. A setting means 3 for setting a weight value HG ₂ is configured to set the weight value of the packaged product weighed by the measuring means 1 to an upper limit allowable weight value HG ₁ and a lower limit allowable weight value set in the setting means.
HG ₂ , a determining means determines that the number of items in the packaged product is a regular number, and 4 is a sorting unit that determines that the packaged product is a good product based on the output of the determining device 3. Means 5 is an average for calculating an average weight value MG of a predetermined number of packaged products each time a predetermined number of packaged products determined to be within the allowable weight range by the signals of the measuring means 1 and the determining means 3 are weighed. The weight value calculation means 6 is a correction means for correcting the reference weight value G set in the setting means 2 to the average weight value MG calculated by the average weight value calculation means 5.

[Effect]

The weighing means 1 measures the weight of the packed product, and a signal corresponding to the weight is input to the determining means 3 and the average weight value calculating means 5.

In the setting means 2, a reference weight value G of the packaged product serving as a reference and an upper limit allowable weight value HG ₁ and a lower limit allowable weight value HG ₂ having constant widths α and β with respect to the reference weight value are set. A signal corresponding to each allowable weight value is input to the determining means 3.

The determining means 3 compares the weighing signal from the measuring means 1 and the signal from the setting means 2, and determines whether the weight of the packaged product weighed by the measuring means 1 is within the allowable range set in the setting means 2. A signal corresponding to the determination result is input to the sorting means 4.

The sorting means 4 sorts out whether the packaged product is a good product or a defective product based on the sorting signal from the judging means 3.

On the other hand, the average weight value calculating means 5 calculates the average weight value MG per one non-defective packaged product determined by the determining means 3 every time a predetermined number of non-defective packaged products are weighed, and the calculated signal is serves as an input signal to the correction means 6.

The correction means 6 corrects the reference weight value G set in the setting means 2 to the average weight value MG calculated by the average weight calculation means 5 based on the signal from the average weight calculation means 5, and performs tracking. conduct.

The reference weight value G set in the setting means 2 is corrected to the average weight value MG of the good pack-packed products every time a predetermined number of good-quality pack-packed products are weighed. It is determined whether the weight of the packaged product is within the same allowable weight range as the allowable weight range for the reference weight value with respect to the average weight value MG of a predetermined number of packaged products. . Based on this judgment result,
If the weight of an individual item always deviates from the permissible weight range centered on the average weight value MG of a predetermined number of packed products, the sorting means 4 sorts out the packed product as a defective product. .

〔Example〕

The present invention will be explained in detail below based on the drawings.

FIG. 2 is a block diagram of one embodiment of the present invention. First, the weight value MK of the packaged product weighed by the measuring means 1 is inputted to the first determining means 31, and the weight value MK of the packaged product weighed by the measuring means 1 is inputted to the first determining means 31, and the weight value MK of the packaged product weighed by the measuring means 1 is inputted to the first determining means 31. It is determined whether the weight value is within the range HG ₁ to _{HG 2} . As a result of this judgment, if the weight MK of the packaged product is within the range of permissible weight values HG ₁ to _{HG 2} , a signal indicating that this packaged product is a good product is output to the sorting means 4. If the weight of the product is outside the range of allowable weight values HG ₁ to HG ₂ , a signal indicating that the packaged product is a defective product is output to the sorting means 4. Therefore, the sorting means 4 sorts the articles into good and defective articles, and takes measures such as issuing an alarm if the weight is outside the permissible weight range.

On the other hand, the signal from the weighing means 1 is input to the average weight value calculating means 5.

This averaging means weight calculation 5 is comprised of a number detecting means 52 of packed products determined to be non-defective by the determining means 31, a counter 53, a reset circuit 54, an adding means 55, and a dividing means 56. A number detecting means 52 for detecting the number of non-defective packed products uses a product number signal detected by a proximity switch or the like installed near the weighing machine (not shown) of the weighing means 1 and the first determination. The logical sum with the signal judgment signal by the means 31 is output. This output is counted at count 52, and when a predetermined number of good products, for example 15, are counted,
The signal is output to the dividing means 56 and used to calculate the average value. In other words, the signal from the measuring means 1 is
The weight is input to an adding means 55, which adds up all the weighing results of the packaged products determined to be good, and outputs a signal corresponding to the added total weight of the packaged products to the dividing means 56. .

The dividing means 56 receives a signal from the adding means 55 corresponding to the total weight of the packaged products determined to be good and a signal indicating the end of counting from the counter 53, and divides the total weight/number of packs. conduct,
The average weight value MG of a predetermined number of packaged products determined as non-defective products is calculated, and a signal corresponding to the average weight value is output to the second determination means 32.

Note that when the counter 53 counts a predetermined number of packaged products and outputs a signal indicating the end of counting to the dividing means 56, the reset circuit 54 resets the counter 53 and the adding means 55 to 0, and from this point on, the counter 53 stops. Counting is started anew, and the addition means 55 is to start adding up the weight of the good packed products anew.

The second determining means 32 compares the signal corresponding to the reference value G set by the reference weight value setting means 21 in the setting means 2 and the signal corresponding to the average weight value MG from the dividing means 56, and if If different, correction method 6
The set value of the reference weight setting means 21 is corrected to the average weight value MG determined by the average weight value calculating means 5 via the.

In this case, the third determining means determines whether the signal corresponding to the average weight value MG is between the upper limit tracking important value AG ₁ and the lower limit tracking weight value AG ₂ set in the setting means 2. 33, and if the average weight value MG is outside the setting range of the tracking weight, a reference value is set so as to be a permissible value equal to the upper limit tracking weight value or the lower limit tracking weight value. Alternatively, measures such as outputting the above signal and issuing an alarm may be taken.

With this modification, the upper limit allowable weight value HG ₁ with a certain allowable range (α and β) with respect to the reference weight value G
and the lower permissible weight value HG ₂ are also revised again.

Hereinafter, based on FIG. 3, a case will be described in which the main parts of this embodiment are implemented using a microprocessor.

In FIG. 3, 1 is a measuring means that detects the weight of one packaged product and outputs a signal corresponding to the detected weight. Further, numeral 52 is a number detecting means which outputs a signal of, for example, one pulse every time a packaged product is detected.

Further, 8 is a microprocessor that performs calculations, and outputs an input/output circuit 9, a central processing unit 10 (CPU), a read-only memory 11 (ROM), a write-read only memory 12 (RAM), and a clock pulse that serves as a reference for calculations. It consists of a clock oscillator (OSC) 13, etc.

Further, reference numeral 4 denotes a sorting means for sorting the packed products into good and defective products according to instructions from the microprocessor 8.

The microprocessor 8 stores the reference weight value G and the allowable widths α and β for the reference weight value G in the RAM 9.
The upper limit permissible weight value HG ₁ and the lower limit permissible weight value HG ₂ having the upper limit permissible weight value HG 1 and the lower limit permissible weight value HG 2, the upper limit tracking weight AG ₁ and the lower limit tracking weight AG ₂ preset for tracking, and the packaged product for determining the average weight value. The CPU 10 calculates the average weight value of the good packed products based on the signals from the measuring means 1 and the number detecting means 7, and calculates the reference weight value G stored in the RAM 9. is corrected to this calculated average weight value MG.
Determine whether the calculated average weight value MG is within the upper and lower limit tracking weight value range stored in RAM9, and if it is outside the range, correct it using the upper limit tracking weight AG ₁ or lower limit tracking weight AG ₂ as the reference value. do. In addition, the CPU 10 stores the weight of the packaged product weighed by the weighing means 1 in the RAM.
The signal S based on the determined result is, for example, a signal of S=1 if the packaged product is a good product, and a signal of S=1 if the packaged product is a defective product. A signal of 0 is output to the selection means 4 via I/09.

Hereinafter, the contents of calculations in the microprocessor 5 will be explained based on the flowchart shown in FIG.

First, initial conditions K=1 and M=0 are set at _P1 .

Next, in P ₁ , the weight of the packaged product
M ₁ ...M ₂ are measured one after another by the measuring means 1.

Next, in step P3, it is determined whether the weight MK of the packaged product weighed by the weighing means 1 is within the allowable weight range having a predetermined allowable width (α and β) with respect to the reference weight value G. be done. As a result of this judgment, if the weight value MK of the weighed packaged product is within the allowable range (G-β<MK<G+α), P ₄
In the process, the CPU 10 outputs a signal of S=1 indicating that this product is a good product to the sorting means 4.
As a result of this judgment, if the weight MK of the article is not within the allowable weight range, proceed to step _P14 , where CPU 1
0 is outputted to the selection means 4 as a signal of S=0 indicating that the article is defective.

If the weighed packaged product MK is determined to be good in P ₃ , it will proceed to P ₅ , and the third
The number of packaged products determined to be good by the determining means 33 is detected by the number detecting means 52, and
It is compared with the quantity N of non-defective items stored in 12, and N=
If it is not K, the weight value MK of the packaged product is added by the adding means 55 as shown at _P5 , and the number of pieces in the counter 53 is increased by one at _P7 . These values are stored in RAM12.

The operations _P2 to _P7 are repeated until N=K, and when N=K, the process proceeds to _P8 .

At _P8 , the division means 56 calculates the division of the total weight value M of the N packaged products by the quantity N, and the average weight value MG=M of the preset quantity of good quality packaged products is calculated. /N is calculated.

Next, in P ₉ and P ₁₀ , it is determined whether the average weight value MG is within the range of the upper limit tracking value AG ₁ and lower limit tracking weight AG ₂ set in the setting means 2, and if it is within the range, P ₁₃ , and if it is outside the range, it moves to steps P ₁₁ and P ₁₂ .

In P ₁₃ , the reference weight value G stored in RAM 12
is corrected to the above average weight value M/N, and tracking is completed.

If the average weight value MG is the upper tracking value
If it exceeds AG ₁ , modify the reference weight value G to the upper limit tracking weight AG ₁ in P ₁₁ , and if it is less than the lower limit tracking weight AG ₂ , modify the reference weight value G in P ₁₂ .
Correct the lower limit tracking weight AG to ₂ and tracking is completed.

FIG. 5 is a characteristic diagram showing how the reference weight value G changes each time it is tracked.

As shown in FIG. 5, each time a predetermined number of non-defective stuffed products are weighed, the reference weight value G is revised to the average weight value of the predetermined number of non-defective stuffed products.

Along with this, a certain width (α
and β) are also changing. However, the upper tracking weight AG ₁ and the lower tracking weight AG ₂ are always constant and the reference weight G
are the upper and lower tracking value ranges (AG ₁ to
AG ₂ ) does not go outside.

Note that when the weight of the article is within the allowable weight range indicated by diagonal lines, the article is determined to be non-defective.

[Effect of idea]

As described above, in the weight sorting machine according to the present invention, the average weight value of the packaged products selected as good products by the judging means and the sorting means is calculated, and the average weight value is set in the setting means by the correcting means. The standard weight value is corrected to the calculated average weight value, so even if the weight of a single item to be packed changes during the manufacturing process due to changes in conditions such as temperature, it will reliably maintain the specified weight. This has the effect of making it possible to sort out whether a certain number of articles are packaged into a product or not.

Further, since the reference weight value is automatically corrected, there is an advantage that there is no need for the troublesome work of manually setting the reference value again.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the entire invention, Figure 2
The figure is an overall block diagram showing one embodiment, Figure 3 is a functional block diagram using a microprocessor, Figure 4 is a flowchart, and Figure 5 is a characteristic diagram showing changes in reference weight value. It is. 1... Measuring means, 2... Setting means, 3... Judgment means, 4... Sorting means, 5... Average weight value calculation means, 6... Correction means.

Claims (1)

[Scope of utility model registration request] A measuring means for measuring the weight of a product packed with a plurality of articles; a reference weight value that serves as a basis for weight sorting of the packed products; an upper limit allowable weight value and a lower limit allowable weight value from the reference weight value; a setting means for setting each of the packaged products; when the weight value of the packaged product weighed by the measuring means is within the allowable weight range between the upper limit allowable weight value and the lower limit allowable weight value; In a weight sorting machine comprising: a determining means for determining that the number of articles in a packed product is a regular number; and a sorting means for determining that the packed product is a good product based on the output of the determining means: an average weight value calculation means for calculating an average weight value of the predetermined number of packaged products each time a predetermined number of packaged products determined to be within an allowable weight range by the determination means; A weight sorting machine comprising: a correction means for correcting the reference weight value to the average weight value when the reference weight value differs from the reference weight value.