JPS6032811B2 - weight measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weight measuring device, such as an electronic toll scale.

A weight sensor, a differential amplifier for amplifying the analog signal of the weight sensor, a frequency reactor for blocking vibrations, an analog-to-digital converter for digitally encoding the amplified analog signal, an arithmetic logic unit, a sequential control means and a data register. A small integrated circuit calculation means, a storage means for temporarily storing weight, unit price, price, other tare weight, N pieces of weight data, etc. Necessary for sequentially controlling the integrated circuit small calculation means A semi-permanent storage means for programming command words, etc., an electronic fare scale equipped with these means, a so-called data processing device consisting of a "microcomputer" or "microprocessor" and its surroundings, and an electric sensor as a weight sensor. Electronic price scales that use weight sensors with extremely small displacement, such as resistance wire load cells, cannot use mechanical dampers to absorb vibrations, so they sense extremely small vibrations.

Furthermore, the output displacement of the weight sensor is an extremely small signal of several French volts, and is very susceptible to noise. This causes the weight to fluctuate due to slight vibrations or noise, resulting in a problem that the weight display flickers. As used herein, "wobble" in weight refers to slight fluctuations caused by slight vibrations of the weighed article or scale, and fluctuations due to noise superimposed on the weight analog signal.

Generally, digital electronic price scales used for retail sales display 1 ta or 2 ta in one scale for a weight of 2k9 to 5k9.

With such precision, relatively small oscillations cause the displayed weight to wander between one or more divisions. This is particularly problematic when the item being weighed is displayed as having a weight between two values. For example 1
On a 2-tameter scale, if the reading is 101.0, the weight displayed is 1.
00 twilight and 102 twilight wandering, or flickering. Conventionally, there are methods for preventing display flickering as described above. Among them, one method is to sequentially store 4 or more N pieces of weight data including the newest weight data sampled as a digital quantity,
First of all, a planned quantity of M or more identical data D.
If there is, D, is regarded as the weight value of the article currently being weighed, D, is temporarily stored, and at the same time it is taken as the weight value of the article currently being weighed. If there is no data, tell us how many identical values there are for each weight data from the N stored weight data, and tell us the weight data D2 that has the largest number L (M) of identical values.
Thirdly, if the different weight data each have L same values, select the newest weight data 〇2 among them, and fourthly, select the weight data 〇2 selected by the second or third above. D selected before this time for data 〇2 (D2),
If the difference in the child data values is within the planned weight value k, D, is considered to be the weight value of the item currently being weighed, and the weight data value difference between 〇2 and D is k. A processing method has been proposed in which, when the difference is larger than that, 02 is regarded as the weight value of the item currently being weighed, and the vibrations of the weight data are digitally subjected to wave processing to prevent fluctuations in the weight value.

However, in this method, a plurality of data values are always processed in order to determine a weight value considered to be a purchase price from a signal containing vibration or noise, so there is inevitably a time delay before displaying the data. It is desirable to perform the wobbling prevention process completely, but it is undesirable to cause an unnecessarily long time delay. For this reason, in areas with little vibration, it is desirable to perform simple anti-wobble processing and quickly respond to indicate that there has been a change in weight.On the other hand, in areas with a lot of vibration, it is desirable to carry out sufficient anti-wobble processing to quickly respond. It shall be prohibited to display weight values that have been Therefore, the time delay between when a weight change occurs and when it is displayed becomes large to some extent. Conventionally, a general place of use has been set and an appropriate treatment method for preventing wobbling has been set for that place of use, but the treatment method is fixed and lacks flexibility depending on the environmental conditions of each place of use. . In view of these points, the present invention makes it possible to change the value of N or M in the above-mentioned wobbling prevention processing method, and to switch whether or not to execute the fourth process, thereby making it possible to improve the performance of each individual user. The object of the present invention is to provide a weight measuring device that makes it possible to easily select an optimal wobbling prevention treatment method depending on the environmental conditions of the location. Next, an embodiment of the present invention will be described with reference to the drawings regarding an electronic fare scale.

Figure 1 shows a system diagram of the circuit configuration, 1 is a weight sensor,
In this embodiment, a 4K9 weighing scale is used as the weight sensor 1, which converts the weight of the article to be weighed by a load cell or the like into an analog voltage signal, and a voltage displacement of several rV is obtained for a change of 2 hours. .

Next, the differential amplifier 2 amplifies the voltage displacement corresponding to the two-day change to a voltage displacement of several mV (amplification degree of about 6M). Next, in order to remove relatively high frequency vibrations and noise, a low-pass filter 3 as a frequency reactor is inserted to block high frequency components.

Furthermore, the analog voltage signal that has passed through this low-pass filter 3 is converted into a dual slope integral type A having a counter 4.
-○ The converter 4 repeats sampling once every several tens of seconds to convert the analog voltage signal into a digital signal.
Here, the A-D converter 4 is adjusted to output a change of 4 counts for a weight change of 2 days. In other words,
When weighing 4k9, it is adjusted to count 8000 counts. Next, in order to prevent the fluctuation of the sampled data according to the present invention, 1
The data is transferred via the /0 port 5 to a data processing device 9 consisting of a central processing unit (CPU) 6, a random access memory (RAM) 7, and a read only memory (ROM) 8.

This data processing device 9 is known in the art as a "microcomputer" or "microprocessor" and is composed of an extremely large integrated circuit.
The data processing equipment 9 includes, for example, a COM-4 type compact calculator manufactured by NEC Corporation, Minato-ku, Tokyo. In this case, the CPU 6 is a PD7510 made by NEC ■, the RAM 7 is a PD41 fox made by NEC ■, the ROM 8 is a PD44 made by NEC ■, and the ROM 8 is a PD44 made by NEC ■.
/0 boat 5 is a PD75 fox manufactured by NEC ■. However, other integrated circuit minicomputers may be used within apparatus 10. 1/0 boat 5, CP that makes up Fukurodaka 10
U6, RAM 7, ROM 8, display and keyboard controller 11 are connected in parallel by an input/output data bus 12 and an address bus 13, and the data used by the data processing device 9 is the digital weight data from the AD converter 4 and It constitutes data received from the keyboard 14.

The insect OM 8 constitutes a sequential controller that stores fixed programs to control the operating sequence of the device 10. This program is obvious in the field of small computers, but it is used to calculate the net weight and price of each article after subjecting the weighing data to the fluctuation prevention processing referred to in the present invention. V is supplied to the CPU 6 to be supplied to the display 15 via the display and keyboard controller 11. Next, the RAM 7 constitutes a storage device for temporarily storing necessary data on the input/output data bus 12 within the device 10. That is, a plurality of N pieces of weight data are sequentially stored in order to perform a wobbling prevention process on the weighing data after the A-D conversion. In addition, weight data which is considered to be the true value subjected to fluctuation prevention processing, the unit price input from the keyboard 14, the tare weight calculated by the CPU 6, the price, etc. are also temporarily stored and the stored contents are supplied to the CPU 6. The display and keyboard controller 11 also stores display data sent from the CPU 6 via the input/output data bus 12 in a display register within the controller 11, and sequentially outputs the contents of the display register to dynamically a weight connected to the input/output data bus 12 and the control code for transmitting data that is displayed and simultaneously pressed by a key from the keyboard 14 to the CPU 6 via the input/output data bus 12;
It is an integrated circuit that controls unit price, price display, and keyboard 14.

Further, a signal input line 46 from a status switching mechanism 45 for preventing wobbling is connected to the 1/0 boat 5 in the device 10.
is connected.

The fluctuation prevention processing status switching mechanism 45 is a switching mechanism that can freely change the fluctuation prevention processing method described later to the optimal fluctuation prevention processing method according to the environmental conditions of the place where the scale is installed, and generates various status signals. It is.
Next, before devising a method for performing wobbling prevention processing on data input to the device 10 including the data processing device 9, a system diagram showing the sequence of operations of the device 10 will be explained with reference to FIG.

First, power the electronic fare scale (here ACIOOV50)
When the HZ) is turned on, "initial processing" 16 turns on all the indicator lights from 0 to 9 in sequence in 13 rows in synchronization with the sampling time of the A-D converter 4 in order to check for abnormal operation of the indicator lights.
Do the following.

Next, "Is there a key input?" 17 is checked to see if there is a "key press" signal. If Yes, that is, the key is pressed, "key processing" 18 is performed. The "key processing" 18 referred to here means that if the unit price input key is used, the calendar number is stored in the unit price register, and if the tare key is used, the weight of the item currently being weighed is processed to prevent fluctuation, and then the weight is considered to be the true value. The data is stored in the tare weight register, and the erase key is to clear the tare weight register. On the other hand, if the key is not pressed, the process jumps to ``weight data input'' 19 and the weight data output from the AD converter 4 is read. Next, in the "wobble prevention process", the latest weight data from Futagawa is compared with a total of N weight data, including a plurality of weight data in order from this weight data, and the weight data that is considered to be the current true value is selected.

Next, auto-zero processing is performed to correct zero-point fluctuations due to temperature drift only when the weight is zero using "auto-zero and tare processing" 21, and wobbling prevention processing is performed to ensure that the content of the tare weight register is the true value of the item currently being weighed. Subtract from the calculated weight data.

Next, in "Price Calculation" 22, the net weight (the value obtained by subtracting the contents of the tare weight register from the weight data that has been processed to prevent fluctuation, which is considered to be the true value of the item being weighed this time), is divided by 2. Calculate the price by subtracting the unit price and the rounded value.

Then, ``Display net weight, unit price, and price using Display J23.'' After completing ``Display'' 23, ``Is there any key input?'' 1
Return to step 7 again and repeat the same operation.

The above is a flow diagram of a simple operational sequence of the apparatus 10.

The RAM 7 used in this embodiment is an integrated circuit storage element having a capacity of 4 bits x 256 words, and FIG. 3 shows a map of the RAM.

Day 24, M25, and L26 indicate addresses representing positions in the RAM 7, and the address is expressed in three hexadecimal digits, with day 24 meaning the most significant digit, L26 meaning the least significant digit, and M25 meaning the middle digit. For example, register 27 in the RAM map diagram
The location is specified by the address of 012 Flea. In this example, the latest weight data d, is 08 flea area,
It is stored in the registers 28 indicated by addresses 081, 082, 083, and 084.

Also, this weight data d, the previous weight data d
2 is stored in the register 29 indicated by 090, 091, 0 group, 093 0 pay address. Similarly, for the weight data from earlier, d4, d5, y, d7, and d8 are OA
O~QA4, Legs~Clothes 4, Plate~Wide 4, Blood~Blood 4, Legs~Blood 4
, each register 30, 31, 32, indicated by address O~Misaki 4,
33, 34, and 35. Further, in the register 36 indicated by female address 5, the weight data d of the contents of the register 28 is stored in the registers 29, 30, 31, 32, 33.
, 34, 35 weight data d2, d3, 4, d5
, d6, d7, if there are identical values in m, the number m is stored.

For example, if there are 3 of them in the data of Q, d tends to have the same value as d.
, m, is 4. In addition, the weight data d2 of the contents of the register 29 is stored in the register 37 indicated by field 095.
For the registers 30, 31, 32, 33, 34, 3
Weight data of contents of 5 d3, d4, d6, d7, d
If there is a value same as d2 in 8, its number is stored. Similarly, register 3 indicated by address OA5, clothes 5, wide 5, blood 5
8, 39, 40, 41 are the registers 30, 31, 3.
The weight data of the contents of 2 and 33 are also in registers 31, 32, 33, 34, 35, registers 32, 33, 34, 35, and registers 33, 34, 3 for d4, wide, and d6, respectively.
5. If the weight data in the registers 34 and 35 have the same value, store the number m3, blood, m5, and shame.
For example, d,,4,d3,d4,d5,d6,d7,d
If all 8 are the same value, registers 36, 37, 38,
Contents of 39, 40, 41 m,, m2, m3. m4, skin,
The skin values are 8, 7, 6, 5, 4, and 3. Also, 070
The register 42 indicated at address ~074 has m, ~mp (1≦
When the value of P≦6) is greater than or equal to a predetermined number M, the weight data dx (x=1 to P) is stored. That is, the dx becomes the weight data D of the contents of the register 42. In this case, the old data in the register 42 is discarded and the register 42 is updated with data dx. Also, 060~0
The register 43 indicated by address 64 stores data dy (y=1 to P) selected from the weight data d and dp when all the values of m and mp are less than or equal to the predetermined number M-1.

That is, the dy becomes the weight data 〇2 of the contents of the register 43, and 〇2 is always rewritten with new weight data dy unless the value of m, ~mp is greater than or equal to M. Also, 0
The register 44 indicated by 65,075 silkworms is a flag for displaying the true value, and when 〇2 was determined to be the true value, the contents F of the register 44 became 1, and conversely, D, was determined to be the true value. The content F of the time register 44 becomes 0.

Next, the status switching mechanism 45 for preventing wobbling
The processing method when the value of the number N (4 min N mi 8) of data to be sequentially stored in the registers 28 to 35 can be changed to three values N, , N2, and N3 is explained according to the flowchart in Fig. 4. I will explain.

In order to store the latest data in the register 28 in "Sequentially shift the previous weight data" 47, the previous weight data d stored in the registers 28, 29, 30, 31, 32, 33, and 34 ,,d2,also,d4
, also, wide, d7, sequentially in registers 29, 30, 31, 3
2, 33, 34, and 35, and the previous weight data L is discarded.

Next, by "reading current data" 48, the current mosquito obtained from the A-D converter 4 also receives new data d, female 0.
~Stored in the register 28 indicated by female address 4. Next, is the r status N? ” 49 If Yes, “Tell me how many data have the same value as each data value for N data.” 50 First, registers 36, 37, 38, 3.
The contents of registers 9, 40, and 41 are all set to 1, and the contents of register 28, that is, the latest data d, are compared sequentially with the previous data, d3, ...dN, ~dN. , is the same as d, the same value is added to the contents of the register 36 as many times as there are the same values, m
The value of , is determined. Next, data d3, q, . . . dN.
are sequentially compared, and if there is a value of ~dN, which is the same as d2, the same value is added to the contents of the register 37 by the number of times there are the same values, and the value of m2 is determined. Thereafter, values up to mN are determined in the same manner. Also, if No in the above 49, proceed to "Is the status N2?" 51, and if Yes here, "Count how many data have the same value as each data value for N2 data" 52, m, The value up to mN2 is determined, and if No, m
, ~ mN3 can be determined.

and m, ~mN, or m, ~mN2, or m. ~
Once the value of mN3 is determined, select N pieces (N=N, or N
2 or N3), the value of m is the largest and the newest data dy in parentheses is selected as 〇2, and "D'
Is the number of values the same as 2 greater than or equal to M? "55 m corresponding to dy
If the value of is greater than or equal to M, dy is treated as dx and stored in the register 42 with "D'2 is regarded as D. and stored" 56.
Let this be the true value. Also, if the value of m corresponding to dy is not less than M, "Is (value of 〇2) - (value of D,) >k?"
In step 57, compare the previous true value D, and the value of data 〇2 selected this time, and if the difference is less than k, set D, as the summer value, and if the difference is greater than k, consider 〇2 as the true value. do. Next, the value of M (5≦M≦8), which is the standard for determining D and
,,The processing method when it is possible to perform in two ways is shown in the fifth section.
The explanation will be given according to the flow shown in the figure. “Shift previous weight data sequentially” 58, “Read current data” 59
, "Tell me how many data have the same value as each data value for N data" 60, "Select the newest data 02 with the most same values" 61, and then when the r status is M, mosquito? If Yes in 62, go to ``Is the number of same values as 〇2 more than M?'' 63, and if No in 62, go to ``Is the number of same values as D'2 more than M2? Go to J64, 63 Or, if Yes in 64, go to 65 where ``regard 〇2 as D and store it'' and set D as the true value.

Also, if No in 63 or 64, “(value of D′2)
-(value of D,)>k? '' 66, the values of D'2 and 0 are compared, and if the difference is less than or equal to k, D is taken as the true value, and if the difference is greater than k, 02 is taken as the true value. Next, a processing method in which it is possible to switch whether or not to execute a processing method of comparing the values of D and 〇2 and determining the true billion based on the difference by the status switching mechanism 45 for preventing wobbling. will be explained along the flow shown in FIG.

“Sequentially shift the previous weight data” 67, “Read the current data” 68, “Shift each data for N pieces of data”
Tell me how many pieces of data have the same value as the data value.'' 69, ``
Select the data 〇2 that has the most identical values and is the newest.''7
0 and then ``Is there a comparison of D?'' 71, Yes.
If it is s, then go to ``Is the number of the same values as 〇2 greater than or equal to M?'' 72, and if Yes here, ``regard 〇2 as D and store it.''
Go to 73 and set D as the true value.

Also, if No in 72 above, “(value of 0′2)−(D
, value)>k'' 74, compare the values of 〇2 and D, and if the difference is less than or equal to k, then 〇 is taken as the true value, and if the difference is greater than k, then 〇2 is taken as the true value. On the other hand, if the question ``Is there a comparison of D?'' 71 is No, the processing methods 72 and 74 are not executed, and 02 is immediately set as the true value. Next, the fluctuation prevention processing status switching mechanism 45 changes the value of the number P (1SP min N) of target data values P, , P2, P3 to teach data of the same value to N pieces of data. A processing method when switching is possible in three ways will be explained along the flowchart of FIG. 7.

``Shift the previous weight data sequentially'' 75, ``Read the current data'' 76, then proceed to ``Is the status P?'' 77, and if Yes here, ``Shift the data of N value''. 78, P. tells us how many pieces of data have the same value as each data value. Number of identical data m, ,...,mM for N data for each data d,,...,dp,
is determined, and if No in 77, “Status is P” is determined.
2? ” 79, and if Yes here, “Tell how many data items have the same value as each data value for N data items only for P2 items.” At 80, the number of identical data m, ,...,mp2 is determined, and if No in 79 above, go to 81 "Tell how many pieces of data have the same value as each data value among N pieces of data only for P3 pieces". Regarding P3 data m・
'..., mp3 can be decided.

and m,,...,mp, or m,,...,mp2
Or m,,...,mp3 is determined, ``Select data 〇2 that has the most identical values and is the newest'' 82.
The data 02 with the largest value and the newest in parentheses is selected, and the true value is determined through the comparison processing flow of steps 83, 84, and 85.

Next, as shown in FIG. 1, two status switches A, B 86, 87 are provided at the ground terminal of the 1/0 boat 5, and the determination of "Is there a comparison of D" 71 in FIG. 6 is determined. The input of the status signal from the switching mechanism 45 for the wobbling prevention processing can be switched between ON and OFF at two points in the wobbling prevention processing flow. 8
As shown in the figure.

Here, the status switching mechanism 45 for preventing wobbling
Therefore, N=8, P=3, M=5, and k=5 are set. After ``key processing'' 88, ``shift previous data sequentially'' 89, and ``lower current data'' 90, d at ``tell the number of same value data for 3 new data among 8 data'' 91. ,,d2, et al., m,,m2, shame is determined, and the next question is "Are there 5 or more data with the same value?"
At 92, if there are 5 or more of m, shame, m3, "data with 5 or more identical values will be stored in register 42" at 93, data where the value of m is 5 or more is stored in register 4 in RAM 7.
2 and use this as the purchase price, but if there are no more than 5 of m,, m2, and ground, "Are there 4 pieces of data with the same value?" 9
4, and here if there is ``m,, m2, 4 inside the pond, ``Is the status SWA ON?'' At 95, it is determined whether there is a status signal input to execute the comparison process, and the status SWA 86 is ON. If so, select “Do not execute” and select “
4If there are two or more pieces of data with the same value, store the new one in the register 42.'' At 96, store the new data whose m value is 4 in the register 42, and make this the true value. However, if the status SWA 86 is OFF, it is "executed" and "if there are two or more pieces of data with the same value, store the newer one in the register 43" 97, and the data whose m value is 4 and the newer one is The data is stored in the register 43 in the RAM 7.

In addition, if there is no 4 among m,, m2, shame in the above 94, "Are there 3 pieces of data with the same value? Go to J 98, and if there is 3 among m,, m2, m3, " If there are two or more pieces of data with the same three values, the newer one is transferred to register 4.
"99, the newer data whose m value is 3 is stored in the register 43, but m,,m
If there is no 3 out of 2, m3, go to ``Are there 2 pieces of data with the same value?'' 100, and if there is 2 out of m,, m2, m3, ``There are 2 pieces of data with the same value?'' If the value of m is 2, store the newer data in the register 43. If there is no 2 among ml, scream, and shame, then store the new one in the register 43. Select the current data and store it in the register 43.'' At 102, the newest data d is selected and stored in the register 43. In this way, when ○2 is stored in the register 43 at any of g7, 99, 101, and 102, a status signal is input to execute the comparison process at 103, "Is status SWB ON?" If the status switch B87 is ON, it is set as "not executed" and the process immediately goes to "Select 〇2" 104, where the data 〇2 in the register 43 is set as the true value, but the status switch B87 is OFF.
If it is F, it is "execution" and "data D of register 42.
Compare the value of the data 〇2 in the register 42 selected this time in step 105 with the value of the data D stored in the register 43 before this time.
Is the difference in comparison less than 5 counts? ``If the difference between the values of D'2 and D is ±5 or less in 106, select rD.'' 107
Go to the register 42 and set the data D, in the register 42 as the true value, and if the difference between the values of 〇2 and D, is larger than 〇2
Go to 104 and set data 〇2 as the true value.

As described above, the data selected as the true value is regarded as the weight count data of the article currently weighed in the "auto zero, tracking, tare processing" 108, and the weight data to be auto zeroed and tared from now on. used for. In addition, in this embodiment, the case where N=8, P=3, and M=5 are set has been described, but the setting is not limited to this. The values of N, P, and M can be switched and changed, respectively. According to the present invention, 4 or more N pieces of weight data including the newest weight data sampled as a digital quantity are sequentially stored, and first of all, if there is a scheduled quantity of M or more pieces of the same data ○, In this case, this D is regarded as the weight value of the article currently being weighed, and D is temporarily stored and simultaneously set as the weight value of the article currently being weighed.Secondly,
If there is no identical data for the planned quantity M or more, count the number of identical values outside of each weight data from the N stored weight data, and calculate the number L (kM) with the largest number of identical values.
Thirdly, if different weight data each have L same values, select the newest weight data D2 among them, and fourthly, according to the second or third Compare the selected data 〇2 (D2) with D, which was selected before this time, and if the difference in the weight data value is within the planned weight value k, D, is the article currently being weighed. If the difference between the weight data values of D'2 and D is greater than k, D'2 is regarded as the weight value of the item currently being weighed and the weight data is digitally calculated. In the device that uses furnace wave processing to prevent evening vibrations and prevents fluctuations in weight values, we have made it possible to change the value of N or M, so if there is little vibration or noise at the place of use, for example, the phenomenon of data fluctuations can be avoided. Therefore, by changing to the fluctuation prevention processing that reduces the value of N or M, the fluctuation prevention processing becomes easier, the response speed for displaying the true value data becomes faster, and the display delay can be reduced. You can easily select and change the optimal anti-wobble treatment method depending on the individual environmental conditions such as vibration or noise in the place, especially when using a scale with a long sampling period or a sampling period that is so long that the human eye senses a delay. In cases where there is a short but large number of samples required for the wobbling prevention process and there is a time delay that is perceived as slow by human vision, the display delay due to the wobbling prevention process can be easily adjusted as appropriate by changing the response speed. Therefore, the performance as a scale can be changed significantly, and it is extremely flexible.

In addition, by making it possible to switch between not executing and executing the fourth comparison process, the difference in the wander prevention process time, that is, the response speed, between the two is extremely large, and the difference in the magnitude of the change in data value is also very large. Since the response speed can be switched and changed regardless of the situation, it becomes easy to select the most suitable wobbling prevention process.

In addition, in a system in which the number of identical data is counted from the N data only for the newest P data values among the N data sampled, and the fluctuation prevention processing is performed, the value of P can be changed. By doing so, it is possible to easily change the comparison time and selection time between data values, which changes the length of time the display remains stable, and also allows the response speed and display delay to be easily changed. It is possible to perform wobbling prevention processing adapted to the conditions.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a circuit configuration showing an example of applying the present invention to an electronic fare scale, Fig. 2 is a simple flowchart showing the data processing process of the above, and Fig. 3 shows the contents of the RAM of the above. A RAM map diagram, Fig. 4 is a flow diagram showing an example of a method for preventing wobbling when the value of N can be changed, and Fig. 5 shows an example of a method for preventing wobbling when the number of M can be changed. 6 is a flowchart showing an example of a method for preventing wobbling when the comparison processing flow can be switched between execution and non-execution. FIG. 7 is a flowchart showing an example of a method for preventing wobbling when the value of P can be changed. FIG. 8 is a flow diagram showing an example of a method for preventing wobbling when status switches A and B are provided. 45...Status switching mechanism for wobbling prevention processing as a switching mechanism for changing the switching of N, changing the switching of M, switching whether or not to execute the comparison process flow, and changing the switching of P. ○ Figure 4 Figure 2 Figure 5 Figure 6 Figure Wa Figure 8

Claims (1)

[Scope of Claims] 1. Four or more N pieces of weight data including the newest weight data sampled as digital quantities are sequentially stored, and first, a predetermined quantity of M or more pieces of the same data D is stored.
If __1 is found, this D_1 is regarded as the weight value of the article currently being weighed, D_1 is temporarily stored and at the same time is set as the weight value of the article currently being weighed, and secondly, the same data of the scheduled quantity M or more are stored. If there is no weight data, count the number of identical values for each weight data from among the N stored weight data, select the weight data D_2 with the largest number of identical values L (<M), and thirdly, calculate the difference. If the weight data that have been selected each have L pieces of the same value, the newest weight data D'_2 is selected among them, and fourthly, the data D'_2 ( D_2) is compared with D_1 selected before this time, and if the difference in weight data value is within the planned weight value k, D_1 is regarded as the weight value of the article currently being weighed, and D_2 is and D_
When the difference between the weight data values of 1 is greater than k, D'_2 is regarded as the weight value of the item currently being weighed, and vibrations in the weight data are digitally filtered to prevent fluctuations in the weight value. 1. A weight measuring device comprising a switching mechanism capable of changing the value of N or M. 2. Store 4 or more N pieces of weight data sequentially, including the newest weight data sampled as a digital quantity, and first store the same data D of a planned quantity of M or more pieces.
If __1 is found, this D_1 is regarded as the weight value of the article currently being weighed, D_1 is temporarily stored and at the same time is set as the weight value of the article currently being weighed, and secondly, the same data of the scheduled quantity M or more are stored. If there is no weight data, count the number of identical values for each weight data from among the N stored weight data, select the weight data D_2 with the largest number of identical values L (<M), and thirdly, calculate the difference. If the weight data that have been selected each have L pieces of the same value, the newest weight data D'_2 is selected among them, and fourthly, the data D'_2 ( D_2) is compared with D_1 selected before this time, and if the difference in weight data value is within the planned weight value k, D_1 is regarded as the weight value of the article currently being weighed, and D_2 is and D_
When the difference between the weight data values of 1 is greater than k, D'_2 is regarded as the weight value of the item currently being weighed, and vibrations in the weight data are digitally filtered to prevent fluctuations in the weight value. data D' selected by the second or third without executing the fourth comparison process.
A weight measuring device comprising a switching mechanism capable of switching between a case where _2 (D_2) is regarded as a weight value and a case where a fourth comparison process is executed. 3. Store 4 or more N weight data sequentially including the newest weight data sampled as a digital quantity, and first store P pieces (1≦P) of the N weight data sequentially starting from the newest weight data. ≦N), count how many identical data exist in N data, and calculate the planned quantity M or more identical data D out of P weight data values.
If _1 is found, this D_1 is regarded as the weight value of the article currently being weighed, D_1 is temporarily stored and at the same time is set as the weight value of the article currently being weighed. If there is no identical data for quantity M or more, calculate the number L (with the highest number of identical values from P weight data)
<M), and thirdly, if different weight data among the P weight data values each have L same values, select the newest weight data D'_2 among them. , and fourthly, the data D_2 (D_2) selected by the second or third method is compared with the data D_1 selected before this time, and the difference in the weight data values is determined as the planned weight value k. If the difference is within the range, D_1 is regarded as the weight value of the item currently being weighed, and if the difference between the weight data values of D'_2 and D_1 is greater than k, D_1 is considered as the weight value of the item currently being weighed.
is regarded as the weight value of the article currently being weighed, and digitally filters vibrations in the weight data to prevent fluctuations in the weight value, and is characterized by being equipped with a switching mechanism that can change the value of P. Weight measuring device.