JPS6260652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for automatically erasing set values in an electronic weighing machine.

Conventional technology With electronic price scales, each time the set value of tare weight or unit price changes, the user is forced to operate a reset switch, clear the previous set value, and then set a new set value, which is a cumbersome operation. was.

In order to avoid such troubles, the following set value automatic deletion method has been developed.

This conventional setting value automatic clearing method first clears the previous tare setting value when detecting the operation of the number key used to set the tare amount after detecting a single weight change in the weighing value. It is configured to store the number entered by operating the number key at that time as the new tare amount set value, thereby eliminating the need for operating a reset switch. In addition, in the following explanation, ``When the operation of the numeric key is detected, the previous setting value is cleared, and the numeric value entered by the numeric key operation at that time is stored as the new setting value.'' This function will be referred to as the "new entry/clear function" and will be explained.

Problems to be solved by the invention In the conventional setting value automatic deletion method as described above,
The following problems remain.

With the conventional set value automatic deletion method, a new entry can be made by simply detecting that the weight value has changed once.
Since the clear function is enabled, there is a problem in that if a salesperson's hand inadvertently touches a number key during a weighing cycle, the set value in use may be erased.

In addition, sales personnel can easily manipulate the new entry/clear function during a weighing cycle to change the correct tare weight T ₀ , which was set before the start of weighing, to T ₁ , which is smaller than T ₀ . It can be repaired. Since this unauthorized operation is performed during the weighing cycle when the object to be weighed is being loaded, the customer cannot confirm the re-set tare weight T ₁ from the weight display, leading to unauthorized weighing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a set value automatic deletion method that can improve operability and prevent unauthorized use of the new entry/clear function.

Means for Solving the Problems The set value automatic clearing method of the present invention detects that the weighed value has changed to a predetermined weight value or more and then decreased to a predetermined weight value or less. By setting the tare amount as a value or the highest digit of the unit price, at least one of the tare amount and unit price of the previous set value is automatically cleared, and the highest digit of the set tare amount or unit price is automatically cleared. It is characterized by storing data.

Effects According to this configuration, the new entry/clear function is not only effective when the weight value simply changes, but also when it is detected that the weight value has changed by more than a predetermined weight value and then decreased to less than the predetermined weight value. Valid only for a limited time.

Embodiment Hereinafter, the setting value automatic deletion method of the present invention will be explained based on a specific embodiment.

Figure 1 shows the amount calculation mechanism of an electronic fare scale equipped with an auto-clear function. 1 is the amount calculation section,
Weighing value data D _g of the heavy object to be weighed outputted by the weighing section 2
The price of the object to be weighed is calculated from the unit price data D _a output from the unit price register 3, and price data D _M is output. 4 is a numeric keypad as an input device for setting the unit price in the unit price register 3, and 5 is an encoder that converts the output signal of the numeric keypad 4 into a BCD code of 1-2-4-8, and outputs the output line l ₁ l ₂ l ₃ l ₄ Output to. 6 is an OR gate for detecting that the numeric keypad 4 has been operated from the output lines _l1 to _l4 , and 7 is a read signal E which delays the output signal of the OR gate 6 by a predetermined time _t1 and has a predetermined time width _t2 . ₈ is an article detection unit that determines from weighing data D _g whether an object to be weighed is loaded on the weighing section 2; In the weighing state, the output is inverted to logic level "H" as shown in FIG. 2a, and returns to logic level "L" when the object to be weighed is removed. Reference numeral 9 denotes a flip-flop whose output state is inverted every time the output of the article detection section 8 falls from logic level "H" to "L", and the output terminal Q changes as shown in FIG. 2b. Reference numeral 10 denotes an AND gate that outputs the logical product of the signal obtained by inverting the output of the article detection section 8 via the inverter 11 [FIG. 2c] and the output terminal Q of the flip-flop 9, and outputs the AND gate of the output terminal Q of the flip-flop 9, which is used to determine the weighing cycle _L1 and the weighing cycle _L2. waiting section between
L ₁₀ , the waiting interval L ₂₀ between the metering cycle L ₂ and the metering cycle L ₃ is detected (FIG. 2d). 12 is an AND gate that outputs the AND of the output of the AND gate 10 and the output of the OR gate 6;
For L ₁₀ , L ₂₀ , . . . , the logic level is inverted to "H" only during the period when the numeric keypad 4 is being operated, as shown in FIG. 3d. 13 is an RS flip-flop which is set by detecting the rising edge of the output of the AND gate 12, and is then set at the timing when the output of the article detection section 8 is inverted from the logic level "L" to "H" in the weighing cycle. It will be reset.
14 is a one-shot multivibrator, R-
The rising edge of the output terminal Q (Fig. 3e) of the S flip-flop 13 is detected and a pulse P with a time width _t3 is generated.
is connected to the clear signal input terminal 16 of the unit price register 3 via the OR gate 15. Reference numeral 17 denotes a manual push button switch for clearing the unit price register, and when operated, a clear signal input terminal 16 of the unit price register 3 is sent via the OR gate 15.
A signal instructing clearing of the logic level "H" is input to the logic level "H".

Next, the operation will be explained based on the main waveform diagram of FIG. 3 and the flowchart of FIG. 4.

Regardless of the weighing cycle or standby period, when the numeric keypad 4 is operated, data D corresponding to the operated key is displayed only during the operation period as shown in FIG. 3a.
_A is output. Also, after a predetermined time _t1 delay from the timing when the key is operated, the read signal generation circuit 7
commands the unit price register 3 to read the input data from the numeric keypad 4. First weighing cycle L ₁
When this is completed, the output of the article detection section 8 returns to the logic level "L", and the output of the AND gate 10 is inverted to the logic level "H" as shown in FIG. 3c.
Therefore, when you key in the top digit of the next unit price on numeric keypad 4, AND gate 12 is entered at timing T _10.
The output [FIG. 3d] is inverted to logic level "H" only during the period when the numeric keypad 4 is being operated. R-S
The flip-flop 13 is activated at timing _T10 of the numeric keypad 4 which is first operated after entering the standby zone _L10 .
It is set by the rise of the output signal of the AND gate 12, and holds that the setting of the next highest digit has been completed until the next weighing cycle _L2 is started. 3e shows the output terminal Q of the R-S flip-flop 13, and the one-shot multivibrator 14 outputs a signal with a time width _t3 from timing _T10 [FIG. 3f] as a clear signal P to the unit price register 3. . Here, the time width _t3 is set shorter than the delay time _t1 of the read signal generator 7, and the unit price register 3 is first set by the clear signal P by setting the most significant digit of the next unit price at timing _T10 . Then, the previous unit price is cleared, and then the data of the most significant digit set by the read signal E _n is stored. Furthermore, since the R-S flip-flop 13 remembers that the highest digit has been set, the clear signal P is not automatically output even if the key-in of the lower digit is performed following the setting of the highest digit. On the other hand, during the weighing cycle, the AND gate 10 output is at logic level "L"
Therefore, even if the numeric keypad 4 is operated, the output of the AND gate 12 maintains the logic level "L" and the R
-S flip-flop 13 is never set. In this manner, when the weighing cycle is completed and the key-in of the highest digit of the next unit price is performed, the previous unit price is automatically cleared and the data of the keyed-in highest digit is stored.

In the above embodiment, auto-clearing of the unit price was explained as an example, but it is also possible to auto-clear the tare amount of the tare subtraction device, and the clear signal P can be used to clear the unit price and tare amount. , at least one of them is automatically cleared.

Effects of the Invention As described above, according to the present invention, when it is detected that the weight value changes to a predetermined weight value or more and then decreases to a predetermined weight value or less, the tare weight or By setting the most significant digit of the unit price, at least one of the previously set tare amount and unit price is automatically cleared, and the data of the most significant digit of the set tare amount or unit price is stored. After each measurement is completed, the new entry
The clear function allows setting values to be changed to new values without operating the reset key, improving operability.

Furthermore, since the new entry/clear function cannot be used until after the metering cycle is completed, unauthorized metering can be prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram of the amount calculation mechanism of an electronic fare scale equipped with an auto-clear function, FIGS. 2 a to d, and FIGS. 3 a to 3.
f is a waveform diagram of a main part, and FIG. 4 is a flowchart thereof. 3...Unit price register, 4...Numeric keypad, 7...
Read signal generation unit, 8...article detection unit, 9...flip-flop, 10, 11...and gate,
13...R-S flip-flop, 14...One-shot multivibrator, 16...Clear signal input terminal, P...Clear signal, _En ...Read signal.

Claims (1)

[Claims] 1 When it is detected that the weighed value has changed to a predetermined weight value or more and then decreased to a predetermined weight value or less, the tare weight value as the next set value or the setting of the highest digit of the unit price changes to the previous value. Tare amount of set value,
A method for automatically clearing a set value in an electronic weighing machine, characterized in that at least one of the unit prices is automatically cleared and data of the set tare weight or the highest digit of the unit price is stored.