JPH01221621A - Electronic counting scale - Google Patents

Abstract

PURPOSE:To maintain the improving function for counting accuracy by single weight update by deciding the stability of load data by using a 1st discrimination level and a 2nd discrimination level which is stricter than it, and updating a single weight value only when the load data is less than the 2nd discrimination level. CONSTITUTION:The weight Wi of samples on a pan is determined (b) according to the data from a load detection part (a) and divided by the contents of a single weight memory (c) to calculate (d) the number Ni of the samples on the pan. A scale like this makes a stability discrimination (f) on the data from the load detection part (a) by using the 1st discrimination level J1 and also makes another stability discrimination (g) on the data from the load detection part (a) by using the 2nd discrimination level J2 which is stricter than the level J1. Then when the 1st stability discrimination means (f) discriminates that the data is stable, that is reported or the current quantity calculation value Ni is outputted; and update operation is carried by a single weight updating means (e) only when the 2nd stability discrimination means (g) discriminates that the data is stable.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention is an electronic system that calculates the number of samples on a plate by dividing the total weight of the sample on the plate by the weight per sample (unit weight). Regarding counting scales.

<Prior art> In some counting scales, after setting the initial value x0 of the unit weight of the sample using a numeric keypad, etc., each time a sample is loaded,
Sequential number n i for Wi (i=1.2 ・-)
! Some devices have been devised to improve counting accuracy by displaying =IW 1/

In order for such a device to function properly, sufficient measurement time must be taken for each sample loaded to ensure that the load data from the load detection unit is sufficiently stable, and accurate sample weights must be obtained. It is necessary to find w+. In this case, "accurate" means, for example, "at the time when fluctuations in load data are within the weight reading limit of this scale." Therefore, in conventional electronic counting scales of this type, once the load data has stabilized to the extent that the above-mentioned "accurate" sample weight Wi can be obtained, the user has been given an OK reading button to allow the user to move on to the next operation. It is configured to output the counting results to the outside for notification or automatic printing of the counting results.

<Problem to be solved by the invention> By the way, for users of electronic counting scales, what they want first when loading a sample is not an accurate unit weight value;
Accurate number display, that is, number display that is guaranteed not to change over time. In this case, in most cases, it may be determined that accurate number display has been obtained, for example, at "the point in time when the variation in load data falls within 172 of the unit weight value at that time." Therefore, although conventional electronic counting scales of this type can provide the accurate number display required by the user, the reading speed is low.
There was no notification of K, and the work could only be carried out in an inefficient manner.

The purpose of this invention is to make the above-mentioned device function correctly, and also to be able to more quickly notify the user that the "accurate number display" required by the user has been obtained, and to achieve high counting accuracy. The object of the present invention is to provide an electronic counting scale that can perform efficient counting work.

<Means for Solving the Problems> The configuration for achieving the above object will be explained with reference to the basic conceptual diagram shown in FIG. The weight determination means for determining the sample weight W above divides the determined sample type MWi by the content X1-1 of the unit weight memory C to determine the number of samples on the dish N!
The sample weight Wi is divided by the number calculating means d, which calculates the number N, and the sample unit weight X! Calculate unit weight memory C
In a scale equipped with a unit weight updating means e for updating the contents of discrimination level J, a stricter second discrimination level J2
A second stability determining means g is provided which determines whether the data from the load detecting section a is stable using the second stability determining means g. When the first stability determining means f determines that it is stable, it notifies you or outputs the calculated number N at that time to the outside, and the second stability determining means g determines that it is stable. The unit weight update means e is configured to execute the update only when the unit weight update means e.

<Effect> For example, as shown in Figure 4, when multiple samples are continuously introduced (loaded) between time A and B, the value of the load data increases correspondingly, and from time B onwards, the value of the load data increases accordingly. The scale asymptotes to a normal value based on the responsiveness of the scale. In order to obtain the above-mentioned "accurate" sample weight, it is necessary to wait until the fluctuation in the load data falls within a small range determined by the reading limit of the scale. On the other hand, "accurate number display" is obtained at time C when the variation in the load data falls within a relatively wide range determined by the unit weight of the sample to be counted.

For example, the discrimination level J of the first stability discrimination means f.

to the level corresponding to time point C, and the determination level J! of the second stability determining means g! The desired objective can be achieved by setting the level at the appropriate level.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

The load detection section 1 includes a load sensor that engages with the plate 1a and an A-ray converter that digitizes the output signal of the load sensor. This load data from the load detection section 1 is input into the control section 2 at predetermined minute intervals.

The control unit 2 is mainly composed of a microcomputer, and includes a CPU 21, a ROM 22 in which a program to be described later is written, a RAM 23 in which an area for storing collected load data and an area as a unit weight memory are set, and external equipment. Input/output interface 2 for connection of
It is equipped with 4th class.

The control unit 2 includes a digital display 3 for displaying the counting results of the number of samples, etc., and the display value is "accurate number display".
A first lamp 4 is lit to notify that reading is OK, a second lamp 5 is to notify that an "accurate sample weight" has been obtained, and an initial value of the sample unit weight. A keyboard 6 for setting values is connected.

FIG. 3 is a flowchart showing the contents of the program written in the ROM 22, and the operation will be explained below with reference to this figure.

First, prior to measurement, the initial value X of the unit weight of the sample to be counted is entered using the keyboard 6 (STl). This value is stored in the unit weight memory in RAM23.

On the other hand, the load data from the load detection unit 1 is collected every moment and stored in the RAM 23 (Sr2), but the RA
In order to always store the latest predetermined number of data in M23, every time the latest data is collected, the old data is shifted and the oldest data is discarded (Sr3).

Each time this latest data is collected, the weight W of the sample on the dish 1a is determined using the data in the RAM 23, for example, by a known method such as averaging (Sr1). Next, by dividing this sample type iW by the content X of the unit weight memory and performing rounding processing, the number N of samples on the dish 1a is calculated,
It is displayed on the digital display 3 (Sr1).

Also, each time load data is collected, check whether the amount of change in the data per time, for example, the amount of change ΔW in the load data in the data collection period Δt, that is, 1ΔW/Δt1, is within the first stability determination level J. It is determined whether or not (Sr1). This first stability determination level J is determined by the content X of the unit weight memory at that time, and is set to, for example, 172 of the value X. This Sr.
Based on the determination result in step 1, it is determined whether the first lamp 4 should be turned on or off. That is, the first lamp 4 is turned on only when Sr1 determines that it is stable (S77.5T8).
.

Also, if Sr1 determines that the data is stable,
Next, it is determined whether 1ΔW/Δt1 is within the second stability determination level J2 (Sr1). This second
The stability determination level J2 is set based on the reading limit of this scale, and is set to the reading limit of 172, for example.

Then, it is determined whether to turn on or off the second lamp 5 based on the determination result in Sr1. In other words, the second lamp 5 is turned on only when Sr1 is determined to be stable (STIO, 5TII). Furthermore, when it is determined that the sample is stable based on Sr1, the sample weight W at that time is divided by the number of samples N, a new unit weight X is calculated, and the contents of the unit weight memory are updated (ST12).

Figure 4 is a graph showing the changes in the actual load on the pan in the counting scale and the changes in the load data value, with the horizontal axis as a common time axis. The operation of the above-mentioned embodiment will be described.

Assume that at time A, the sample is started to be placed on the dish 1a, and at time B, the sample is stopped. The output of the load sensor of the load detection unit 1 changes accordingly between A and B, and therefore the load data obtained by digitizing the output at every Δt changes as plotted in the figure. After time B Although there is no change in the live load on the pan 1a, the value of the load data will asymptotically approach a steady value based on the response characteristics of this scale.The amount of change in this load data per time 1ΔW/Δt1
After the point C when the weight is less than 1/2 of the sample unit weight X, the number calculation result N does not change until it reaches a steady state, considering the calculation method, and can be regarded as the final value. Therefore, even if the first lamp 4 is immediately turned on at this point to notify that the reading is OK, no problem will occur.

On the other hand, the sample weight W gradually changes until the load data approaches a steady value and 1ΔW/Δt1 falls to about 172 or less, which is the reading limit of this scale. Therefore, in order to update unit weight X for the purpose of improving counting accuracy,
Until this point, you need to wait for the data to stabilize.

By lighting the second lamp 5 at this point,
The user of this counting scale can perform efficient counting work by turning on and off the first lamp 4.

That is, if it is necessary to update the unit weight, wait for the second lamp 5 to light up and then load or remove the sample, and if it is not necessary to update the unit weight, for example, count the sample. This is the end; next time, when counting another sample, etc., read the displayed value immediately by turning on the first lamp 4 without waiting for the second lamp 5 to turn on, and move on to the next operation. can do.

Note that the first and second stability determination levels J1 and J2
In addition to the information based on Δt and ΔW as described above, appropriate information such as the difference between the maximum value and the minimum value of the latest predetermined number of load data can be used as the information regarding the fluctuation of the load data to be compared. Of course you can get it.

Furthermore, in the above embodiment, the first and second lamps 4 and 5 are provided corresponding to the first and second stability determination levels J and J2, and the fluctuations in the load data are within the respective levels. Although the corresponding lamps are turned on at this point, the second lamp 5 may be turned on when the unit weight value is updated. In other words, the conditions for updating the unit weight value are
In addition to the condition of stability of load data, for example, sample weight W
is near an integer multiple of the current unit weight value in the unit weight memory, the second lamp 5 is updated only when these conditions are satisfied and the unit weight value is actually updated. By lighting up, the user can know whether there is an update or not.

In addition, only one lamp is installed, and the load data is J.

The light may be turned off if it is not within J1, blink if it is not within J2, and turn on if it is within J2. In this case, costs can be reduced.

Furthermore, only the second lamp 5 corresponding to the second stability determination level Jt is provided, and when the fluctuation of the load data is settled within the first stability determination level J, the counting results are transferred to an external device and printed on the printer. It is also possible to configure the system to automatically print the information using a method such as the above, thereby making it possible to perform counting operations more efficiently.

Also, if the unit weight value is updated only under very limited conditions and only rarely, for example, during the first two or three counting operations after initializing the unit weight value. This corresponds to a counting scale in which the unit weight value can be updated only when the unit weight value is updatable. is preferred. Then, the lamp L is turned on in a state where the above-mentioned unit weight value can be updated.

When the lamp Lt is lit, the lamp Lt is automatically turned on and off based on the stability determination result using the second stability determination level J2 described above.

When the lamp Lx is off, the lamp Lx is automatically turned on and off based on the stability determination result using the first stability determination level J. By doing this, it is known in advance whether or not the unit weight value can be updated, and the lamps Ll, L! This can be determined by the lighting of the other side, and unnecessary careful counting work is eliminated when updating is impossible.

<Effects of the Invention> As explained above, according to the present invention, the stability of load data is determined using the first discrimination level and the second discrimination level, which is stricter than the first discrimination level, and the load data When the number of pieces falls within the first discrimination level, it is notified that the number display is accurate, or the calculated number of pieces is output to the outside, and the load data falls within the second discrimination level. Since the unit weight value is configured to be updated only occasionally, it is possible to maintain the function of improving counting accuracy by updating the unit weight, and to more quickly notify that the displayed value is accurate. Able to perform accurate and efficient counting work.

[Brief explanation of the drawing]

Figure 1 is a basic conceptual diagram showing the configuration of the present invention, Figure 2 is a block diagram showing the configuration of an embodiment of the present invention, and Figure 3 is the ROM.
22 is a flowchart showing the contents of the program written in FIG. 22, and FIG. 4 is an explanatory diagram of its operation. 1...Load detection section 1a...Dish 2...Control section 21... CPU 22... ROM 23... RAM 3... Digital display 4... First lamp 5... ...Second lamp patent applicant Shimadzu Corporation Representative Patent attorney Nishi 1) New Figure 2 Figure 4 f

Claims (1)

[Claims] weight determining means for determining the weight of the sample on the dish based on data from the load detection section; number calculating means for calculating the number of samples on the dish by dividing the determined weight by the content of the unit weight memory; In a scale equipped with unit weight updating means for calculating the sample unit weight by dividing the sample weight determined by the weight determining means by the calculated number and updating the contents of the unit weight memory, First and second stability determining means for determining whether or not the data from the load detection section is stable using a first determining level and a second determining level that is stricter than the first determining level, respectively. and when the first stability determining means determines that the sample is stable, it notifies to that effect or outputs the calculated value of the number of samples by the number calculating means at that time to the outside, and also performs the second stability determining means. An electronic counting scale characterized in that the unit weight updating means executes an update only when the means determines that the unit weight is stable.