JPH0758219B2 - Electronic counting scale - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention calculates the number of samples on a plate by dividing the total sample weight on the plate by the weight (single weight) per sample. Regarding counting scales.

<Prior art> In the counting scale, after setting the initial value x _{0 of the unit} weight of the sample with a numeric keypad etc., the sample weight W _i
The number n _i ≈W _i / x _i-1 is sequentially displayed for (i = 1,2 ...), and the unit weight value is updated by newly obtaining the unit weight x _i = W _i / n _i. However, there are some devised to improve the counting accuracy.

In order for such a device to function properly, it is necessary to take a sufficient measurement time for each loading of the sample, sufficiently stabilize the load data from the load detection unit, and obtain an accurate sample weight W _i . In this case, "accurate" means, for example, "at the time when the variation of the load data is within the weight reading limit of this scale". Therefore, with this kind of electronic counting scale, conventionally, when the load data is stable enough to obtain the above-mentioned “correct” sample weight W _{i, the} reading is allowed to allow the user to shift to the next operation. Is output or the count result is output to the outside in order to automatically print the count result.

<Problems to be Solved by the Invention> By the way, for users of electronic counting scales, the first thing they want when loading a sample is not an accurate unit weight,
It is an accurate count display, that is, a count display guaranteed not to change over time. In this case, for example, even if it is determined that the accurate number display is obtained at "the time point when the variation of the load data is within 1/2 of the unit weight value", there is no problem in most cases. Therefore, in the conventional electronic counting scale of this kind, although the accurate display of the number required by the user was obtained, the reading OK was not notified and only inefficient work could be performed. .

The object of the present invention is to make the above-mentioned device function properly and to notify more quickly that the "correct number display" required by the user has been obtained. The object is to provide an electronic counting scale capable of performing efficient counting work.

<Means for Solving the Problems> A configuration for achieving the above object will be described with reference to the basic conceptual diagram shown in FIG. 1. The present invention is based on the data from the load detector a. Weight determining means b for determining the upper sample weight W _i, and number calculating means for dividing the determined sample weight W _i by the content x _i-1 of the weight memory c to calculate the number N _i of samples on the dish and d, by dividing the sample weight W _i in the calculation the number N _i to calculate the sample unit weight x _i, in balance with the unit weight updating means e for updating the contents of the unit weight memory c, the first determination First stability determination means f for performing stability determination of the data from the load detection unit a using the level J ₁ , and the first determination level J ₁
A second stability determination means g is provided for performing the stability determination of the data from the load detection unit a using the stricter second determination level J ₂ . When the first stability determining means f determines that the stability is stable, the fact is notified or the number calculation value N _i at that time is output to the outside, and the second stability determining means g is output.
Only when it is determined that the unit is stable, the unit weight updating unit e executes the updating.

<Operation> For example, as shown in FIG. 4, when a plurality of samples are continuously loaded (loaded) between time points A and B, the value of load data increases correspondingly, and after time point B Asymptotically approaches the normal value based on the responsiveness of this scale. In order to obtain the above-mentioned "accurate" sample weight, it is necessary to wait until time D when the variation of the load data falls within the minute width determined by the reading limit of this scale. On the other hand, the "correct number display" is obtained at the time point C when the variation of 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 ₁ of the first stability discrimination means f is set to the level corresponding to the time point C, and the discrimination level of the second stability discrimination means g is set.
By setting J ₂ to a level corresponding to time point D, the intended purpose can be achieved.

<Example> An example of the present invention will be described below with reference to the drawings.

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

The load detection unit 1 includes a load sensor that engages with the dish 1a, an AD converter that digitizes an output signal of the load sensor, and the like. The load data from the load detection unit 1 is taken into the control unit 2 every predetermined minute time.

The control unit 2 is mainly composed of a microcomputer, and has a CPU 21 and a ROM in which a program described later is written.
22, a RAM 23 in which an area for storing the collected load data and an area as a unit weight memory are set, an input / output interface 24 for connecting to an external device, and the like.

The control unit 2 has a digital display 3 for displaying the counting result of the number of samples, and the display value thereof is "correct number display".
The first lamp 4 for notifying that the reading is OK by lighting, the second lamp 5 for notifying that the "correct sample weight" has been obtained, and the initial sample weight A keyboard 6 for setting a value is connected.

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

First, prior to the measurement, the initial value x of the unit weight of the sample to be counted is set by the keyboard 6 (ST1). This value is R
It is stored in the unit weight memory in AM23.

On the other hand, the load data from the load detection unit 1 is collected every moment and sequentially stored in the RAM 23 (ST2), but the latest data is collected so that the RAM 23 always stores a predetermined number of the latest data. The old data is shifted and the oldest data is discarded (ST3).

Every time this latest data is collected, the sample weight W on the dish 1a is obtained using the data in the RAM 23 by a known method such as averaging (ST4). Next, this sample weight W is divided by the content x of the unit weight memory and rounded to calculate the number N of samples on the dish 1a, which is displayed on the digital display 3 (ST5).

Further, every time the load data is sampled, the amount of change of the data per time, for example, the amount of change ΔW of the load data in the data sampling cycle Δt, that is, | ΔW / Δt | falls within the first stability determination level J ₁ . Is determined (ST
6). The first stability determination level J ₁ is determined by the content x of the unit weight memory at that time.
It is set to the size of 1/2. On / off of the first lamp 4 is determined based on the determination result in ST6. That is, the first lamp 4 is turned on only when it is determined to be stable in ST6 (ST7, ST8).

When it is determined in ST6 that the data is stable, it is then determined whether or not | ΔW / Δt | is within the second stability determination level J ₂ (ST9). The second stability determination level J ₂ is set based on the reading limit of the balance, and is set to, for example, half the reading limit. Then, the lighting of the second lamp 5 is determined based on the determination result in ST9. That is, the second lamp 5 is turned on only when it is determined to be stable in ST9 (ST10, ST11). Further, if it is determined to be stable in ST9, the sample weight W at that time is divided by the sample number N to newly calculate the unit weight x, and the content of the unit weight memory is updated (ST12).

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

It is assumed that loading of the sample onto the dish 1a is started at the time point A and stopped at the time point B. Accordingly, the output of the load sensor of the load detection unit 1 changes greatly between A and B, and therefore the load data obtained by digitizing the output for each Δt changes as plotted in the figure. After time B, the load on the dish 1a does not change, but the value of the load data gradually approaches the steady value based on the response characteristics of the scale.
After the time point C when the amount of change in load data | ΔW / Δt |
From the calculation method, it does not change until it reaches a steady state and can be regarded as the final value. Therefore, at this time, even if the first lamp 4 is immediately turned on to notify the reading OK, no trouble occurs.

On the other hand, the sample weight W gradually changes until the load data becomes closer to the steady value and | ΔW / Δt | falls to about 1/2 or less of the reading limit of this scale until time D. Therefore, in order to update the unit weight x for the purpose of improving the counting accuracy, it is necessary to wait until the time point D until the data becomes stable. By turning on the second lamp 5 at this time point D, the user of this counting scale turns on and off the first lamp 4,
It is possible to perform efficient counting work.

That is, when it is necessary to update the unit weight, additional loading or removal of the sample is performed after waiting for the second lamp 5 to be turned on. Further, when the unit weight update is not necessary, for example, counting work of the sample is performed. Ends at this time, and when counting another sample from the next time onward, the display value is immediately read by the lighting of the first lamp 4 without waiting for the lighting of the second lamp 5, and the next operation is performed. can do.

Note that the information regarding the variation of the load data compared with the first and second stability determination levels J ₁ and J ₂ is Δ as described above.
Of course, other than the one based on t and ΔW, it is of course possible to use an appropriate one such as the difference between the maximum value and the minimum value of the latest predetermined number of load data.

Further, in the above embodiment, the first and second ramps 4 and 5 are provided corresponding to the first and _second stability determination levels J ₁ and J ₂ , and the fluctuation of the load data is within each level. Although the corresponding lamp is turned on at that time, the second lamp 5 may be turned on when the unit weight value is updated. That is, when the condition for updating the unit weight value is not only the condition for stabilizing the load data but also includes, for example, that the sample weight W is in the vicinity of an integral multiple of the current unit weight value in the unit weight memory, By turning on the second lamp 5 only when the conditions are satisfied and the unit weight value is actually updated, the user can know whether or not the unit weight value has been updated.

As further only one lamp is provided, the load data is turned off if not fall within the J _1, falls within J _1, and flashes if not fall within the J _2, lights if they fit into the J ₂ You may comprise, and in this case, cost can be reduced.

Furthermore, only the second lamp 5 corresponding to the second stability determination level J ₂ is provided, and when the variation of the load data is within the first stability determination level J ₁ , the counting result is transferred to the outside. A printer or the like may be used for automatic printing, which enables more efficient counting work.

Further, when the unit weight value is updated only under fairly limited conditions and is executed only infrequently, for example, after initializing the unit weight value, the first 2-3 counting operations are performed. This corresponds to a counting scale in which the unit weight value can be updated only at this time. In this case, a lamp L ₁ that indicates “unit weight value can be updated” and a lamp L ₂ that indicates “stable” can be provided. preferable. Then, the lamp L ₁ is lit in the state where the unit weight value can be updated, and when the lamp L ₁ is lit, the stability determination result using the _second stability determination level J ₂ is automatically performed. off point the lamp L ₂ based on, also, when the lamp L ₁ is off, the lamp L ₂ is turned off point based on the automatically first stability determination level J ₁ the stability determination results using . By doing this, it will be known in advance whether or not the unit weight value can be updated, and the fact that the update has actually been performed will be known by the lighting of the lamps L ₁ and L _{2 on} the other side, and when the update is impossible. Unnecessarily careful counting operations are eliminated in.

<Effects of the Invention> As described above, according to the present invention, stable determination of load data is performed using the first determination level and the second determination level that is stricter than the first determination level, and the load data is determined. When it falls within the first discrimination level, it is notified that the number display is accurate, or the number calculation value is output to the outside, and the load data falls within the second discrimination level. Only when it is configured to update the unit weight value, it is possible to maintain the function of improving the counting accuracy by the unit weight update, and, more quickly, notify that the displayed value is accurate, etc. Accurate and efficient counting work can be performed.

[Brief description of drawings]

FIG. 1 is a basic conceptual diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 3 is a flow chart showing the contents of a program written in the ROM 22, and FIG. FIG. 1 …… Load detection unit 1a …… Plate 2 …… Control unit 21 …… CPU 22 …… ROM 23 …… RAM 3 …… Digital display 4 …… First lamp 5 …… Second lamp

Claims (1)

[Claims] 1. A weight determining means for determining the weight of a sample on a plate based on data from a load detection unit, and the determined weight is divided by the contents of a unit weight memory to calculate the number of samples on the plate. In a scale equipped with a number calculating means and a unit weight updating means for updating the contents of the unit weight memory by dividing the sample weight determined by the weight determining means by the calculated number to calculate the sample unit weight , A first determination level and a second determination level which are stricter than the first determination level which are set in advance, respectively are used to determine whether or not the data from the load detection unit is stable. When the first stability determining means determines that the stability is stable, it notifies that effect or outputs the sample number calculated value by the number calculating means at that time to the outside, and Second Only when the stability determination means has determined that stable, characterized in that it is configured to perform an update by the unit weight updating means, scale electronic counting.