JPH034850B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tare subtraction device for an electronic fare scale, and the purpose thereof is to provide one tare command key and to input numerical data from the unit price setting numerical keys to the fare calculation unit or from the scale unit. To improve the operability of a toll scale by expanding the usable environment of a tare subtracting device configured to write weight data obtained from a tare into a tare memory.

Conventionally, when there is only one tare command key, when the tare command key is operated when the weight data obtained from the scale section is not zero, the data input circuit of the tare memory stores the current weight data in the tare memory. When the tare command key is operated when the weight data is zero, the contents of the numeral memory (hereinafter referred to as numeral data) are written with the numeric keys for unit price setting in the charge calculation section. ] is the input data of the tare memory. With this configuration, although the weight data or the set number data can be written to the tare memory with one tare subtraction command key,
The following problems occur: That is, under adverse conditions in which the weighing values of the scale section are difficult to balance, the set number data may not be written into the tare memory, resulting in a decrease in operability.

The present invention provides a gate circuit which uses the weight data as input data to a tare memory when the digit data is zero, and uses this digit data as input data to the tare memory when the digit data is not zero. By giving priority to the set number data of the set number data and weight data, the set number data can be manipulated in a single operation even under adverse conditions where the weight values are difficult to balance. This has the effect of improving operability by allowing reliable writing.

An embodiment of the present invention will be described below based on the drawings.

1 is a weighing section, which includes a load cell 3 that outputs an analog signal corresponding to the load G of the object to be weighed placed on the tray 2, an amplifier 4, and A that converts the output of the load cell 3 via the amplifier 4 into digital. -D converter 5, and weight data _W0 corresponding to the load G is generated at the output of the A-D converter 5. 6 is a tare subtraction device, which includes a tare memory 7 that stores the tare amount and the contents of this tare memory 7 W _T
The main part is a subtracter 8 which uses the weight data W ₀ as a subtraction number and the weight data W 0 as a subtraction number, and the output of the subtractor 8 generates net weight data (W ₀ −W _T ) after tare correction. 9 is the number key for unit price setting, 10 is the number key 9
This is a numeric memory that stores the numeric values from , and each time a key is pressed, the numeric values that have already been keyed in are shifted to the upper digits and stored in sequence. Reference numeral 11 denotes a charge calculation unit, which stores the numeral data written in the numeral memory 10.
The above net weight data (W ₀ − W _T ) with M _IN as the unit price
Calculate the product price for the weight given by . 12 is a weight display unit that digitally displays net weight data (W ₀ −W _T ) as a weight value; 13 is the above-mentioned number data;
A unit price display section 14 digitally displays M _IN , and a charge display section 14 digitally displays the calculation result of the charge calculation section 11. Further, 15 is a clear key for instructing clearing of the set number data M _IN , and 16 is a tare command key, which outputs a tare command to update the tare memory 7 every time it is operated. In addition,
The data input circuit of the tare memory 7 is configured as follows. Reference numeral 17 denotes a determiner for determining whether or not the number data M _IN is zero; 18 a gate circuit; when the determiner 17 determines that M _IN =0, the weight data W ₀ is converted into the input data of the tare memory 7; If the determiner 17 identifies M _IN ≠ 0, the numeric data
It is configured to use M _IN as input data to the tare memory 7.

According to this configuration, the contents of the tare memory 7 W _T
If it is necessary to rewrite the current weight data W ₀ , the update can be carried out by clearing the set number data M _IN and then operating the tare subtraction command key 16. Then, by the combination of the determiner 17 and the gate circuit 18, the set number data M _IN and the weight data are determined.
Of W ₀ , the numeric data M _IN is stored in tare memory 7.
Since the weight data _W0 is configured to be treated preferentially as input data, even under adverse conditions where it is difficult to balance the weight data W0, you can simply enter the value in the number memory 10 and operate the tare command key 16. , the contents of the tare memory 7 can be rewritten to the set number data M _IN without fail.

As explained above, according to the present invention, between the weight data obtained from the scale section and the contents of the set number memory, the contents of the set number memory are handled preferentially, and the tare weight is stored by operating one tare command key. The contents of can be rewritten to the weight data or the contents of the numeral memory, so if you clear the numeral memory and output the tare subtraction command, the contents of the tare memory will be rewritten to weight data, and the key will be input to the numeral memory. By outputting a tare command, the contents of the tare memory can be reliably updated to the contents of the number memory even under adverse conditions where the weight data obtained from the scale is zero and balance is difficult, making it easier to operate the charge scale than before. This greatly improves performance.

[Brief explanation of drawings]

The drawing is a configuration diagram of an embodiment of a toll scale equipped with a tare subtraction device of the present invention. 1... Scale part, 6... Tare subtraction device, 7...
Tare memory, 8...Subtractor, 9...Numeric keys for unit price setting, 10...Number memory, 11...Charge calculation unit, 16...Tare subtraction command key, 17...Judgment device, 18...Gate Circuit, W ₀ ……Weight data,
M _IN ... Contents of numeric memory.

Claims (1)

[Claims] 1. A tare memory whose contents are updated to the input data each time a tare subtraction command is detected, a numeral memory that stores the value input from the unit price setting numerical keys to the charge calculation section, and the contents of this numeral memory. a gate that supplies the weight data obtained from the scale unit as input data to the tare memory when is zero, and supplies the contents of the register memory as input data to the tare memory when the contents of the register memory are not zero; A tare subtraction device in an electronic fare scale equipped with a circuit.