JP3706346B2 - Number scale and method of counting articles using the scale - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a number scale for counting the number of articles of the same type and an article number counting method using the scale.
[0002]
[Prior art]
As a method of counting the number of articles from the weight of an article, for example, the invention of Japanese Patent Laid-Open No. 56-70421 is known. In this invention, the average reference weight obtained by counting the weight W of the article placed on the balance. A method of obtaining an integer value N of the number of articles by obtaining a numerical value n including a decimal number corresponding to the number divided by m while repeatedly adding the article and rounding off the decimal number is proposed.
[0003]
In this case, every time an article is added, the average reference weight m is corrected so as to converge to a more accurate value by increasing the number n. This method is suitable for counting the number of articles with little variation, and can respond quickly, but has several problems in terms of counting accuracy and counting efficiency.
[0004]
In general, when considering the problem of counting accuracy in a counting scale, for example, to recognize a weight of 10 g consisting of 10 articles whose average weight M of the population is 1.00 g, almost accurately as 10 pieces. The average reference weight m for obtaining the number needs to be within, for example, 0.95 to 1.05 g. This indicates that the error from the average weight M allowed for the average reference weight m should be ± 5% or less in order to correctly count the 10 pieces.
[0005]
Further, when 100 pieces of the same article are obtained, more strictness is required to correctly recognize them as 100 pieces. In this case, the error allowed for the average reference weight is ± 0.5%, and if the range is exceeded, a counting error occurs.
[0006]
When these conditions are generalized and expressed on the basis of the number N of integer values, equation (1) is derived.
N <0.5 · (m / ε) (1)
[0007]
Here, ε is a deviation value from the average weight M which should be called a true average value of the average reference weight m. M / ε in equation (1) can be replaced with equation (2) if the error is σ.
N <0.5 / σ (2)
[0008]
For example, when the error of the average reference weight m with respect to the average weight M is 1%, the number N to be counted from the equation (2) is 0.5 / 0.01 = 50 or less. It will deviate from the number. Further, when counting 500 pieces at a time, the weight error of the article must be within 0.5 / 500 = 0.001. If such a condition is satisfied, when the weight W is obtained by dividing by the average reference weight m, the integer number N can be correctly counted by the operation of rounding off the quotient n.
[0009]
[Problems to be solved by the invention]
The quotient n obtained by dividing the weight W by the average reference weight m corresponds to the number, and is expressed as in equation (3).
n = N ± Nσ (3)
[0010]
Here, N is an integer part, and Nσ is a decimal part. The decimal part is the product of the number N and the error σ, and may be considered as a counting error. Since N and σ are unknowns, for example, if N is set to be close to 50, the allowable range of error is uniquely determined. Therefore, when the numerical value of the fractional part of n corresponding to the number is monitored, it does not become as large as possible. It can be assumed that the determination of the number is a measurement method with little counting error.
[0011]
Thus, in order to obtain the number N with high accuracy, it is advantageous to increase the accuracy of the average reference weight m, or not to increase the number of articles to be counted, that is, the number of articles placed on the scale. . However, in the above-mentioned invention of JP-A-56-70421, emphasis is placed on reducing the variation of the average reference weight in order to increase the counting accuracy, and the final number is displayed as an integer by an internal calculation function. There is no means to monitor variation during measurement, and there is no means to operate even if the operator wants to arbitrarily determine the number of errors while there is little error. It's not a good measurement method.
[0012]
The object of the present invention is to solve the above-mentioned problem, and the number counting operation is not based only on the automatic operation of the apparatus, but the operator monitors the number information of articles including decimal numbers and converts it to an integer as necessary, An object of the present invention is to provide a number scale capable of improving counting accuracy and counting efficiency by continuously adding articles and counting the number of times, and an article number counting method using the scale.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the number scale according to the present invention comprises a weighing unit for weighing the article placed on the upper plate, an integer area display unit for digitally displaying integers, and a decimal number in graphic form. A number display unit having a decimal area display unit that displays whether or not the decimal by the number is within an allowable range, and dividing the output of the weighing unit by the reference weight of the article to convert the number of articles including the decimal, An arithmetic unit that rounds off the obtained number to obtain an integer, displays the integer on the integer area display unit, and displays a decimal of a difference between the integer and the number on the decimal area display unit. It is characterized by.
[0014]
In addition, the method of counting the number of articles using the number scale according to the present invention includes a weighing unit for weighing the article placed on the upper plate, an integer area display unit for digitally displaying an integer, and a decimal number as a graphic display. Dividing the output of the weighing unit by the reference weight of the article and converting it to the number of articles including decimals, a number display unit having a decimal area display unit that displays whether or not the decimal number by the figure is within an allowable range The obtained number is rounded off to obtain an integer, the integer is displayed on the integer area display unit, and a decimal part of the difference between the integer and the number is displayed on the decimal area display unit. In the method of counting the number of articles using a number scale, a first step of obtaining an average reference weight m by dividing an initial weight W0 obtained by weighing articles of a known minority number N0 by the known minority number N0, and the article Add more Dividing the weight difference ΔW between the weighed weight W and the previous weight by the previous average reference weight m to obtain the number n including the decimal of the article, and adding the number n to the previous integer number The second step of displaying n ′ on the number display part and the decimal area display part of the number display part confirm whether the decimal number is within the allowable range, and if it is outside, the decimal number is within the allowable range. The third step of adding or subtracting the number of the articles on the upper plate and the fourth step of obtaining a new average reference weight m by dividing the weight W by the whole integer number, the second step to The number of articles is counted by repeating the fourth step.
[0015]
Furthermore, the method for counting the number of articles using the number scale according to the present invention includes a weighing unit for weighing the article placed on the upper plate, an integer area display unit for digitally displaying integers, and a decimal number for graphic display. Dividing the output of the weighing unit by the reference weight of the article and converting it to the number of articles including decimals, a number display unit having a decimal area display unit that displays whether or not the decimal number by the figure is within an allowable range The obtained number is rounded off to obtain an integer, the integer is displayed on the integer area display unit, and a decimal part of the difference between the integer and the number is displayed on the decimal area display unit. In the method of counting the number of articles using a number scale, an integer number N0 is obtained from the number obtained by dividing an initial weight W0 obtained by weighing a small number of articles by a known average weight, and the weight W0 is calculated as the integer. Number N The first step of obtaining an average reference weight m by dividing by the above, and the weight difference ΔW between the weight W further weighed by adding the article and the previous weight is divided by the previous average reference weight m to obtains the number n including fractional, and a second step of displaying the number n 'obtained by adding the integer number of up to the number of the coefficients n and the previous to the number display unit, the fractional said by fractional area display unit of the number display unit Check if it is within the allowable range, and if it is outside, a third step of adding or subtracting the number of the articles on the upper plate so that the decimal is within the allowable range, and dividing the weight W by the whole integer number And a fourth step of obtaining a new average reference weight m, and the number of articles is counted by repeating the second to fourth steps.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the illustrated embodiment.
FIG. 1 is a perspective view of a scale for carrying out the method of the present invention. The appearance of the scale 1 includes a base 2, an exterior part 3, an upper plate part 4, a display part 5, and an operation part 6. The display part 5 includes, for example, a number display part 7, a weight display part 8, and a single weight display part 9. Place. The operation unit 6 includes a number integer button 10 and a numerical value input key 11 for inputting numerical values. Reference numerals 12 and 13 denote other function buttons, and a weighing mechanism unit and a circuit unit are built in the base 2.
[0017]
FIG. 2 is an enlarged view of the number display unit 7. The number display unit 7 is provided with an integer area 7a in the upper part and a variation area 7b in the lower part, and the decimal part of the number is changed from +0.5 region to -0.5. Displayed by scale bar between areas.
[0018]
For example, when the number 125.4 is obtained, the integer value 125 obtained by rounding 125.4 is displayed in the integer area 7a, and the plus side of the variation area 7b is represented by the scale bar corresponding to the numerical value corresponding to 0.4 decimals. Displayed at 0.4 position. The variation area 7b indicates the degree of variation by a decimal value, but a safety area 7c indicating, for example, ± 0.3 is provided as a range in which variation is allowed.
[0019]
If the operator presses the integer button 10 when the decimal is within the safe area 7c, the decimal is deleted. The decimal display by the scale bar may be a graphic display by a pie chart, pictograph, symbol, lamp or the like.
[0020]
FIG. 3 is a block circuit configuration diagram, in which the output of the weighing unit 21 connected to the upper plate unit 4 is connected to a calculation unit 23 made of, for example, a microprocessor via an AD conversion unit 22. The unit 7, the weight display unit 8, the unit weight display unit 9, the integer button 10, the numerical value input key 11, and the storage unit 24 are connected.
[0021]
Next, the method of the present invention will be described with reference to the operation flowchart of FIG. For ease of understanding, the weighing error of the weighing unit 21 is ignored. First, when an article P consisting of a known minority number N0, for example 10 pieces, is placed on the upper plate part 4 of the scale 1 in step S1, the output of the weighing part 21 corresponding to the weight W0 is passed through the AD conversion part 22. For example, 10.389 g as the weighing value of the article P is displayed on the weight display unit 8 and stored in the storage unit 24 at the same time.
[0022]
In step S 2, when the operator inputs a numerical value 10 corresponding to the known number N 0 to the calculation unit 23 via the numerical value input key 11, 10 is displayed in the integer area 7 a of the number display unit 7 and also stored in the storage unit 24. Remember. In this case, the known minority number N0 is a numerical value that is the basis of the measurement lot, and if an incorrect input is made, the subsequent counting accuracy is greatly hindered. Therefore, in practice, it is preferable to place four or five articles that can accurately recognize the number at a glance. Alternatively, if the number to be weighed first is determined in advance, the operation of the numerical value input key 11 can be made unnecessary.
[0023]
Subsequently, in step S3, the calculation unit 23 divides the weight W0 = 10.3389 g by the number N0 = 10, and displays 1.039 g which is a quotient on the unit weight display unit 9 as an average reference weight m0 and a storage unit 24. To remember.
[0024]
In step S4, when the article P is further added to the upper dish part 4, for example, 31.952 g is obtained as the weight W1, and the weight W1 = 31.952 is displayed on the weight display part 8 and stored in the storage part 24.
[0025]
In step S5, the weight difference ΔW = (W1−W0) is calculated by the calculation unit 23 from the previous weight W0 stored as the weight W1, and the weight difference ΔW = 21.563 g is obtained. ΔW is divided by 1.039 g which is the average reference weight m0 previously obtained and stored by the calculation unit 23 to obtain the number n = 20.75.
[0026]
The number N0 = 10 already stored is added to the number n = 20.75 obtained in step S6 to display the number n1 = 30.75 on the number display section 7. The number display unit 7 displays the number 31 which is the integer value closest to the integer area 7a, and displays −0.25 of one decimal place with a scale bar in the variation area 7b.
[0027]
In step S7, when it is confirmed by the safety area 7c of the variation area 7b that the fractional part of the number n1 does not exceed the range, when the operator presses the integer button 10, the display of the variation area 7b is erased. The number n1 of 30.75 is determined as an integer value N1 = 31 and stored in the storage unit 24.
[0028]
In this operation, if the decimal part of the number n1 is out of the safety area 7c, the counting error is likely to intervene when the integer button 10 is pressed as it is. Therefore, in this case, it is also preferable to alert the operator by issuing an alarm sound or to prevent the integer button 10 from operating. When there is an alarm, the operator removes the article P from the upper plate part 4 a little and re-weighs it, and after confirming that the decimal part enters the safety area 7c, the operator converts the number into an integer with the integerizing button 10. Is preferred.
[0029]
In step S8, if the obtained integer value N1 does not reach the target number, the process proceeds to step S9, where the calculation unit 23 divides the weight W1 = 31.952g by the total number 31 and sets the average reference weight m1 as 1. 031 g is obtained and displayed on the unit weight display unit 9 and stored in the storage unit 24. Then, the process returns to step S4.
[0030]
In steps S4 to S6, the article P is further added and the weight W2, for example, W2 = 65.830 g is weighed and displayed on the weight display unit 8. Calculate the weight difference ΔW = (W2−W1) = 65.830−31.952 = 33.878 g from the previous weight W1 = 31.952 g stored in the calculation unit 23, and obtain the average reference previously obtained The number n2 = 63.86 obtained by adding the number N1 = 31 already stored to the obtained numerical value 32.86 is displayed on the number display section 7 by dividing by the weight m1 = 1.031 g. In the number display section 7, 64 is displayed in the integer area 7a, and -0.14 is displayed in the variation guide.
[0031]
In step S7, after confirming that the decimal part of the number n2 is within the safety area 7c of the variation area 7b, when the operator presses the integer button 10, N2 = 64 is determined and stored in the storage unit 24. Remember.
[0032]
If the number N2 obtained in step S8 does not reach the target number, the calculation unit 23 further divides the weight W2 = 65.830 g by the number N = 64 in step S9, and newly sets the average reference weight m2 to 1. .029g is obtained and displayed on the unit weight display unit 9 and stored, and the process returns to step S4.
[0033]
As the number of weighings increases, the number of measured items increases and the accuracy of the average reference weight further improves. Therefore, the number of articles P placed on the upper dish portion 4 can be increased as the number of weighings increases.
[0034]
In step S8, if the total number N displayed on the number display unit 7 has reached the desired number, the operation may be terminated. A slight difference from the target number may be reduced by adding or adding the number of articles P to the upper dish portion 4.
[0035]
In addition, when approximate information on the average weight M of the article is obtained from past experience or statistics, the average weight M is input from the numerical value input key 11, and there is a variation error that the average weight M has first. If a small number of articles P that do not intervene in the number are weighed, the number and the average reference weight m based on the number can be obtained without inputting the number. Thereafter, the counting operation similar to that after step S4 in the flowchart shown in FIG. 4 can be performed. In this case, the average weight M stored in the storage unit 24 can be used without inputting the average weight M from the numerical value input key 11.
[0036]
In counting the number of articles using the number scale according to the present invention, the number display unit including a decimal number indicates the number and variation of articles to the operator. Therefore, if an allowable range of variation is set in advance, articles can be placed continuously as long as the range is not exceeded, and if the numerical value n is sufficiently secured, the number can be determined by converting it into an integer. . In addition, since it can prevent beforehand that a decimal exceeds 0.5, the recalculation of an average reference | standard weight etc. becomes unnecessary.
[0037]
In the case of articles with large variations, it is effective not to increase the number of counts at once as described above. Therefore, if the operator monitors the magnitude of variation according to the article at that time and determines the number to be an integer by the integer button 10 as occasion demands, it is possible to cope with counting of the number of articles with particularly large variation.
[0038]
【The invention's effect】
As described above, the number scale according to the present invention and the article number counting method using the scale obtain the number including the decimal by dividing the weight value of the obtained article by the average reference weight, and the operator's judgment The number of articles can be accurately measured by repeating the addition of articles while converting the number into an integer.
[Brief description of the drawings]
FIG. 1 is a perspective view of a scale.
FIG. 2 is a front view of a number display unit.
FIG. 3 is a block circuit configuration diagram.
FIG. 4 is an operation flowchart.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Scale 2 Base 3 Exterior part 4 Upper plate part 5 Display part 6 Operation part 7 Number display part 7a Integer area 7b Variation area 7c Safety area 8 Weight display part 9 Single display part 10 Integer button 11 Numeric input key 21 Weighing Unit 22 AD conversion unit 23 Calculation unit 24 Storage unit

Claims (6)

A weighing unit for weighing the weight of the article placed on the upper plate, an integer area display unit for digitally displaying the integer, and a decimal area display for displaying whether the decimal by the graphic is within an allowable range The number display unit having a part, and the output of the weighing unit is divided by the reference weight of the article to convert it to the number of articles including a decimal number, and the obtained number is rounded to obtain an integer. A number scale comprising: an arithmetic unit that displays on the integer area display unit and displays a decimal of a difference between the integer and the number on the decimal area display unit . The number scale according to claim 1, wherein an allowable range of the decimal is −0.3 to +0.3 . A weighing unit for weighing the weight of the article placed on the upper plate, an integer area display unit for digitally displaying the integer, and a decimal area display for displaying whether the decimal by the graphic is within an allowable range The number display unit having a part, and the output of the weighing unit is divided by the reference weight of the article to convert it to the number of articles including a decimal number, and the obtained number is rounded to obtain an integer. In a method of counting the number of articles using a number scale provided with an arithmetic unit that displays on an integer area display unit and displays a decimal of the difference between the integer and the number on the decimal area display unit ,
A first step of obtaining an average reference weight m by dividing an initial weight W0 obtained by weighing an article having a known minority number N0 by the known minority number N0;
Further, the weight difference ΔW between the weight W weighed by further adding the article and the previous weight is divided by the previous average reference weight m to obtain the number n including the decimal of the article, and the number n and the previous weight A second step of displaying the number n ′ obtained by adding the integer number on the number display section;
The decimal area display part of the number display part confirms whether the decimal is within the allowable range, and if it is not, the number of the articles on the upper plate is adjusted so that the decimal is within the allowable range. Process,
A fourth step of dividing the weight W by a whole integer number to obtain a new average reference weight m,
An article number counting method using a number scale, wherein the number of articles is counted by repeating the second to fourth steps. 4. The article number counting method using a number scale according to claim 3 , wherein the known minority number N0 is input by an input numerical value input key or is a predetermined numerical value. A weighing unit for weighing the weight of the article placed on the upper plate, an integer area display unit for digitally displaying the integer, and a decimal area display for displaying whether the decimal by the graphic is within an allowable range The number display unit having a part, and the output of the weighing unit is divided by the reference weight of the article to convert it to the number of articles including a decimal number, and the obtained number is rounded to obtain an integer. In a method of counting the number of articles using a number scale provided with an arithmetic unit that displays on an integer area display unit and displays a decimal of the difference between the integer and the number on the decimal area display unit ,
First, an integer number N0 is obtained from a number obtained by dividing an initial weight W0 obtained by weighing a small number of articles by a known average weight, and an average reference weight m is obtained by dividing the weight W0 by the integer number N0. Process,
Further, the weight difference ΔW between the weight W weighed by further adding the article and the previous weight is divided by the previous average reference weight m to obtain the number n including the decimal of the article, and the number n and the previous weight A second step of displaying the number n ′ obtained by adding the integer number on the number display section;
The decimal area display part of the number display part confirms whether the decimal is within the allowable range, and if it is not, the number of the articles on the upper plate is adjusted so that the decimal is within the allowable range. Process,
A fourth step of dividing the weight W by a whole integer number to obtain a new average reference weight m,
An article number counting method using a number scale, wherein the number of articles is counted by repeating the second to fourth steps. 6. The article number counting method using a number scale according to claim 5 , wherein the known average weight is input by an input numerical value input key or is a predetermined value.

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