JPS6260653B2 - - Google Patents

Description

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

Conventionally, for example, with electronic price scales, each time the tare weight or unit price changes, the previous set value is erased by operating a reset switch, etc.
They were forced to perform the cumbersome operation of setting new settings.

Therefore, the present invention provides an automatic erasing method for automatically erasing at least one of the previously set tare amount and unit price.

The automatic erasing method according to the present invention will be explained below based on one embodiment. FIG. 1 shows a configuration diagram of an electronic price scale equipped with an auto-clearing device, in which 1 is an amount calculation section, and the weighing value data D _g of the heavy object outputted from the weighing section 2 and the unit price register 3 are The price of the object to be measured is calculated from the unit price data D _a to be output, 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; 5 is a weighing unit 2;
The article detection unit determines from the weight value data D _g that the object to be weighed is loaded on the weighing section 2, and the output is at logic level "H" when the weighing section 2 is loaded with the object to be weighed. It outputs a signal and returns to logic level "L" when the object to be measured is removed. 6 is the article detection unit 5
R-S is set at the timing t _d when the output falls from the logic level "H" to "L", and is reset at the timing t _u when the output of the article detection section 5 rises from the logic level "L" to "H". Flip-flops 7 and 8 are circuits for detecting the timings t _d and t _u from the output of the article detection section 5, respectively. 9 is a counter that counts the number of input clock pulse signals, and when it overflows, the logic level changes from "H" to "L". Outputs a time-up signal E _t that inverts to
The contents of the counter are the R-S flip-flop 6.
It is reset at the timing t _u ' when the signal at the output terminal of the output terminal rises from the logic level "L" to "H". Reference numeral 10 denotes a reset signal generating circuit which detects the timing t _u ' from the signal at the output terminal of the RS flip-flop 6 and outputs a reset signal E _R of a predetermined width. 11 is the overflow signal of counter 9 and R
- AND gate 13 for controlling the output of the clock signal generator 12 output signal on and off using the signal at the output terminal Q of the S flip-flop 6 as a control signal;
14, 15 and 16 are a clear signal generating unit which detects the time-up signal E _t and outputs a clear signal E _c to the unit price register 3, and 14, 15 and 16 are respectively responsible for the weight value data D _g , unit price data D _a and price data _DM . This is a display section that digitally displays weight, unit price, and price.

Next, the operation will be explained based on the main part waveform diagrams and flow sheet diagrams shown in FIGS. 2a-g and 3.

First, when an object to be weighed is loaded onto the weighing section 2 at time _T1 , the output signal of the object detection section 5 [FIG. 2b] is inverted to logic level "H", and the R-S flip-flop 6 outputs the circuit 8 output [ 2d, the output terminal is inverted from the logic level "L" to "H", and the contents of the counter 9 are reset. Further, since the output terminal Q is inverted to the logic level "L", the AND gate 11 is turned off and the clock signal CK is not inputted to the counter 9. When the object to be weighed is removed from the weighing section 2 at time T ₂ and the weighing cycle L ₁ is completed, the article detection section 5
The output signal falls from the logic level "H" to "L", the R-S flip-flop 6 is set by the output of the circuit 7 (FIG. 2c), and Q instead of the output terminal goes to the logic level "H". Invert. Output terminal Q
is inverted to logic level "H", the AND gate 11 is turned on, and the counter 9 receives the clock signal CK of the clock generation circuit 12 [second].
(a) in FIG. 2 is input, and the contents of the counter 9 (f in FIG. 2) count the clock signals and increase as time elapses. Next, at time T ₃ before the counter 9 reaches the count value C _MAX at which it overflows, the object to be weighed is loaded onto the weighing section 2 again and weighing is restarted.
The set RS flip-flop 6 is reset, and the count value C _T3 of the counter 9 is also reset once. Therefore, the time-up signal (E _t [Fig. 2 e]) that falls from the logic level "H" to "L" is not output to the clear signal generator 10.
The contents of the previous unit price register 3 can be used again in the next metering cycle _L2 . However, once the weighing cycle has been completed, if weighing is not restarted within the time required for the contents of the counter 9 to reach the count value _CMAX , a time-up signal _Et is output to the clear signal generator 13, and the unit price The contents of register 3 are automatically cleared. In other words, during the period from when the counter 9 starts counting until it outputs the time-up signal, the weighing section 2
As soon as the object to be weighed is removed from the counter 9, the contents of the counter 9 are reset in preparation for the completion of the next weighing cycle. When the time-up signal E _t is output, the AND gate 11 is turned off to maintain the overflow state of the counter, and the contents of the unit price register 3 are cleared by the signal E _c [Fig. 2g]. ] is prohibited from occurring repeatedly. Therefore, even if you use the numeric keypad 4 to set the next unit price after the contents of the unit price register 3 are once auto-cleared and before the next weighing cycle starts, the contents of the unit price register 3 will be automatically cleared until the next weighing cycle starts. At least it will not be cleared until the contents of the counter 9 reach the count value _CMAX again.

Although the above embodiment has been explained using an example of auto-clearing the unit price, it is also possible to auto-clear the tare amount of the tare subtraction device, and the signal E _c of the clear signal generator 13 is a combination of the unit price and the tare amount. At least one of them shall be used as a clear signal.

As explained above, according to the automatic erasing method of the present invention, when it is detected that the weighed value has decreased below the predetermined weight value and the weighed value has not increased above the predetermined weight value within a predetermined time, the previous set value is In order to automatically clear at least one of the tare weight and unit price,
It is possible to continue using the set value once set for a long period of time, and there is no need to operate a reset switch etc. when changing the setting, which significantly improves operability. .

[Brief explanation of the drawing]

The drawings show an embodiment according to the present invention; Fig. 1 is a block diagram of an electronic fare scale equipped with an auto-clear function, Fig. 2 a to g are waveform diagrams of main parts, and Fig. 3 is a flow sheet diagram thereof. be. 3...Unit price register, 4...Numeric keypad, 5...
Article detection unit, 6...R-S flip-flop, 9
... Counter, 11 ... And gate, 13 ...
Clear signal generator, E _t ... time-up signal,
CK...Clock signal, _Ec ...Clear signal.

Claims (1)

[Claims] 1 When it is detected that the weighed value has decreased below the predetermined weight value and the weighed value has not increased above the predetermined weight value within a predetermined time, at least one of the tare weight and unit price of the previous set value is automatically changed. A method for automatically clearing set values in an electronic weighing machine, which is characterized by clearing the set values.