JPS6039971B2 - Processing device for display data in weighing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing device for display data in a measuring device.

Conventionally, in weighing systems such as electronic fare scales, when an article is placed on a load tray, the weight of the article is converted into an analog voltage signal using a differential transformer, load cell, etc., and the voltage signal is then converted into an analog voltage signal. There is a known system in which the metering data is converted into digital metering data using a /D converter, charge data is calculated using this metering data and preset unit price data, and the charge data is displayed together with the metering data. .

By the way, in such a device, the weighing data obtained from the A/D converter flickers due to the vibration of the load tray due to the placement of the goods or the circuit noise of the A/D converter, which causes the displayed charge data and weighing There were problems such as data flickering, making it difficult to see, and creating a sense of distrust among customers.

For this reason, for example, it may be possible to lengthen the sampling period of the measurement data sampled from the A/D converter to reduce flickering in the displayed data. There is a problem in that it takes a long time for the data to be displayed, which reduces the ability to weigh items. This invention was made in consideration of the above points, and it is possible to reduce the flickering of the displayed data even if the weighing data flickers due to the vibration of the load pan or circuit noise. It is an object of the present invention to provide a processing device for display data in a weighing device without degrading dust.

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, the present invention will be described as applied to an electronic fare scale. Reference numeral 1 denotes a scale body which is provided with a load receiving tray, a load cell, etc., and extracts the weight of an article using a corresponding analog voltage signal.

The voltage signal obtained from this scale body 1 is converted into an A/○ converter 2.
The data is converted into digital measurement data, sampled, and supplied to the arithmetic circuit 3. This digital arithmetic circuit 3 includes first, second, and third registers 4, 5, and 6, and first and second comparators 7? 8. Gate circuit 9 and controller 10
``The first register 4 stores the current measurement data Mi, the second register 5 stores the previous measurement data Mi-, and the third register 6 stores the current measurement data Mi. is configured to store the measurement data Mi-2 from the previous time.Then, the measurement data Mi stored in the first register 4 is supplied to the display register 11 via the gate circuit 9. Also, the first comparator 7 compares the measurement data Mi, Mi-, respectively stored in the first and second registers 4 and 5,
The result is transmitted to the controller 0, and the second
The comparator 8 compares the weighing data Mi-, Mi-2 stored in the second and third registers 6, 6, respectively,
The results are communicated to the controller Q. The controller IQ includes the first and second comparators 7
The comparison data obtained from ,8 is Mi-2<Mi-,>M
i, Mi-2>Mi-. <Mi, Mi-2: Mi-・E Mi, Mi-2=Mi-, when the sheep Mi, the cable circuit 9 is closed, and Mi-2 half Mi-・=Mi,
When Mi-2<Mi-, <Mi, Mi-2>MH>Mi, the cable circuit 9 is opened and the contents of the display register 11 are cleared.
The metering data stored in the display register 11 is displayed on the metering display 12 and is also sent to the charge calculation circuit 13.
is being supplied to. This fee calculation circuit turtle 3
The charge data is calculated from the input metering data and preset unit price data. This charge data is displayed on the charge display turtle 4. Note that the above conditions Mi-2 - Mi-,>Mi, Mi-2
MH Mi, Mi-2: Mi-, Mi is set in accordance with fluctuations in the weighing data that are likely to occur due to vibration of the load pan or circuit noise. In the device according to the embodiment of the present invention having such a configuration, an article was placed on the scale body 1, and the weighing data sampled from the A/D converter changed according to the weight of the article as shown in a in FIG. 2. shall be.

First, when no article is placed on the scale body 1, the weighing data Mi stored in each register 49, 59, 6,
Mi-, , Mi-2 are all 0 and MFM;-,=Mi-
2 and gate circuit 9 from controller 0'
is closed. At this time, the weighing data stored in the display register 1 is "0", the weighing display 2 displays the weighing data "0", and the charge display 14 displays the charge data "0". Ru. In this state, the article on the scale body 1 is placed and the weighing data is "50" from the A/D converter 2.
is stored in the first register 4, each register 4, 5,
The relationship between the measurement data of No. 6 is Mi-2=Mi-, ≠Mi, and the closing operation of the gate circuit 9 caused by the controller o' does not change. However, the measurement data stored in the display register 11' remains unchanged and remains at "0". Next, the measurement data "100" from the A/D converter 2 is stored in the first register W, and the measurement data "50" that has been stored in the first register 4 is stored in the second register 5. Then, the relationship between the measurement data of each register 4, 5, and 6 is Mi.
[2<Mi-. Therefore, the controller 10 opens the gate circuit 9, and the measurement data "n00" stored in the first register 4 is stored in the display register via the gate circuit 9. Thus, the metering data "100" is displayed on the metering display 12, and the charge data calculated based on the metering data "100" is displayed on the charge display 14. Next, when the measurement data "100" is stored in the first register 4 from the A/D converter 2, the measurement data stored in the second and third registers 5 and 6 become "100" and "50" respectively. So, each register 4
, 5, and 6 is Mi-2≠MH=Mi, the gate circuit 9 is opened by the controller 10', and the metric data "100" stored in the first register 4 is transferred to the gate circuit. Display register 1 via 9
It is stored in 1. That is, the measurement data "100" is stored in the display register 11 following the previous one, and the displayed data does not change. Next, when the measurement data "101" is stored in the first register 4 from the A/D converter 2, the measurement data stored in the second and third registers 5 and 6 become "100" and "100", respectively. Therefore, the relationship between the weighing data of each register 4, 5, and 6 is M;-2=Mi-, Mi. Therefore, the gate circuit 9 is closed by the controller 0, and the contents of the display register 1 do not change. Each display 12,
The data displayed at 14 remains unchanged. In this way, the relationship between the measurement data of the controller 1 and each register 4, 5, and 6 is M-2<MH>Mi, M;-2>MH<Mi, Mi-
2=Mi-,=Mi, Mi-2=Mi-・±Mi, the gate circuit 9 is closed and the contents of the display register 1 are not changed, and Mi-2≠MH: Mi, Mi・2 <M
When H<Mi, Mi-2>Mi-,>Mi, the gate circuit 9 is opened and the weighing data Mi stored in the first register 4 is stored in the display register 1.
After that, the A/D converter 2 outputs the weighing data "99" and "100".
”, “101”, “100”, and “99” are sequentially stored in register 4 of 1, the measurement data stored in display register 1 is “100”, “loo”, “101”, and “10”.
1” and “99”. That is, while the metric data sampled from the A/D converter 2 changes as shown in a of FIG. 2, the metric data stored in the display register 1 changes as shown in b of FIG. I will do it. In other words, while the metric data sampled from the A/D converter 2 changes drastically, the metric data stored in the display register 1 does not change much and maintains a stable state. Therefore, the metering data displayed on the metering display 12 and the charge data displayed on the charge display 14 are stable and do not flicker much. Therefore, there is no possibility that the displayed data will flicker and become difficult to see due to the vibration of the load receiving tray or the occurrence of circuit noise, and there will be no risk of causing a sense of distrust to the customer. In addition, there is no need to make the sampling period of the weighing data from the A/D converter 2 particularly long, and the sampling can be carried out in the same manner as in the past, so there is no problem of deterioration of the article weighing processing capacity. Incidentally, the control process of the digital arithmetic circuit 3 described above is shown in a flowchart as shown in FIG. In the above embodiment, the digital arithmetic circuit uses three registers and two comparators, but the present invention is not limited to this.
For example, it can be constructed by using two registers and one comparator, and further by using a memory for temporarily storing the result of comparing the contents of both registers with the comparator.

As described in detail above, according to the present invention, the input metric data is sequentially sampled at a fixed period, and among the sampled data, at least the metric data M from the previous two times
i-2 and the previous metric data Mi-, and the relationship between the currently sampled metric data M; and each of the above-mentioned metric data Mi-2, Mi-, is M-2±M,-,
=Mi, Mi-2<M;-, <Mi, Mi-2>MH>
Since the display contents change based on the current weighing data Mi only in the case of Mi, it is possible to reduce flickering of the displayed data, and also to reduce the amount of dust that degrades the weighing processing capacity of articles. Accordingly, it is possible to provide a processing device for display data in a weighing device that does not have a

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Fig. 1 is a block diagram showing the circuit configuration, a in Fig. 2 is a graph showing measurement data sampled from the A/D converter, and b in Fig. 2 is a graph showing the measurement data sampled from the A/D converter. A graph showing the weighing data stored in the display register,
FIG. 3 is a flowchart showing the control process of the digital arithmetic circuit in FIG. i. 2...A/D converter, 3...Digital arithmetic circuit, 4, 5, 6...Register, 7, 8...Comparator,
9. ．． ．． ...Gate circuit, 10...Control, 11...Display register. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A means for sequentially sampling the inputted metrical data at a fixed cycle, and of the data sampled by this means, the current metrical data M_i, the previous metrical data M_i_-_1, and the previous metrical data M_i_-_1. first, second, and third registers each storing metric data M_i_-_2; and metric data M_i, stored in the first and second registers.
A first comparator that compares the contents of M_i_-_1 and the metric data M_i_ stored in the second and third registers.
-_1, M_i_-_2 The relationship between the second comparator and each of the metric data M_i, M_i_-_1, M_i_-_2 obtained by the first and second comparators is at least M_i_- _2<M_i_−_1>M_i,
M_i_-_2>M_i_-_1<M_i, M_i_-
A processing device for display data in a weighing device, comprising a controller that prohibits rewriting of display data when _2=M_i_−_1≠M_i. 2. Means for sequentially sampling input metric data at a constant cycle, first and second registers, a comparator,
It is equipped with a memory and a controller, and among the data sampled by the sampling means, the previous measurement data M_i_-_1 and the measurement data M_i_ of the time before the previous one are stored.
−_2 are stored in the first and second registers respectively and compared by the comparator, the comparison results are stored in the memory, and then the current measurement of the data sampled by the sampling means is performed. The data M_i and the previous weighing data M_i_-_1 are respectively stored in the first and second registers and compared by the comparator, and the comparison result and the content stored in the memory are compared by the controller. , each of the resulting metric data M_
i, M_i_-_1, M_i_-_2 is at least M_i_-_2<M_i_-_1>M_i, M_i_
−_2>M_i_-_1<M_i, M_i_-_2=M
A processing device for display data in a weighing device, characterized in that rewriting of display data is prohibited when _i_−_1≠M_i.