JPS636815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for holding the display of an electronic weighing machine.

Among electronic weighing machines, price scales load the object to be weighed into the weighing section, display the price corresponding to the object to be weighed, then lower the object from the weighing section, and package the object to be weighed. In many cases, goods and money are delivered based on the price display. Therefore, even after the weighing is completed and the object to be weighed is removed from the weighing section, it is necessary to keep the display on the weighing machine on hold. Conventionally, the hold is controlled by providing a switch for instructing to hold the display and a switch for canceling the hold. However, operating the switch frequently is cumbersome and has poor operability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a display hold method that can automatically release the display hold.

An embodiment of the present invention will be described below based on the drawings. Fig. 1 shows a block diagram of a price scale, in which an amount calculation unit calculates the price of the object to be weighed from weight value data Dg corresponding to the weight value output from the weighing unit 2 and unit price data Da. Outputs price data _DM corresponding to . 3 is weight value data Dg, unit price data Da,
A display section that digitally displays price data _DM as weight, unit price, and amount, respectively.It has a control terminal CT, and by connecting the control terminal CT to logic level "H", the display of the time can be temporarily stored. The input data is fixed and displayed regardless of fluctuations in the input data. 4
stores the data sequentially keyed in using the numeric keypad 5 as an input device until the time when the clear terminal CL is connected to the logic level "H" and outputs the unit price data Da. Reference numeral 6 denotes a read signal generation unit that detects the timing of reading the unit price register 4 from the output signal of the numeric keypad 5, and 7 a self-resetting type push button switch [second] that connects the clear terminal CL of the unit price register 4 to logic level “H”. Figure d]. Reference numeral 8 denotes a self-return type hold start push button switch, which outputs a set signal S (FIG. 2a) when operated. 9 is a timer circuit which is set by a set signal S and outputs a time-up signal Tu (Fig. 2c) when it detects the elapse of a predetermined time t from the set time, and is connected to logic level "H". Therefore, it has a reset terminal R for temporarily resetting the time measurement contents, and the reset terminal R is connected to the clear terminal CL of the unit price register 4.
Reference numeral 10 denotes an RS flip-flop which is set by the set signal S and reset by the time-up signal Tu or the output of the pushbutton switch 7, and its output Q is connected to the control terminal CT of the display section 3.

When the pushbutton switch 8 is operated, the timer circuit 9 and the R-S flip-flop 10 are set, and the control terminal CT (FIG. 2b) of the display section 3 is immediately inverted to the logic level "H". Therefore, display section 3
holds and displays the display contents at that time.
This display is held by R-S flip-flop 1.
Since this continues until the time when 0 is reset, if the contents of the unit price register 4 are cleared by operating the push button switch 7 before the time-up signal Tu is output, this operation will cause the R- The S flip-flop 10 is reset and the hold on the display is immediately released to prepare for the next weighing. Further, if the push button switch is not operated, the hold is automatically released by the time-up signal Tu. In this way, the hold is released by the timer circuit output after a predetermined time t has elapsed, and when the contents of the unit price register 4 are updated, the hold contents of the display are deemed unnecessary and the time-up signal Tu is released. The timer circuit 9 resets the display hold immediately even before the output of
The provision of this does not impair work efficiency or operability.

In the above embodiment, when the contents of the unit price register 4 are updated, the display hold is immediately reset. The same effect can be obtained even if the hold is immediately reset at the appropriate timing.

As explained above, according to the display holding method of the present invention, the hold can be automatically released without operating a hold release switch or the like as in the conventional case, so that work efficiency and operability are improved. It is something.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a block diagram of a fare scale, FIGS. 2 a to d are waveform diagrams of main parts, and FIG. 3 is a flow sheet diagram. 2... Weighing section, 3... Display section, 4... Unit price register,
7...Push button switch, 8...Push button switch for starting hold, 9...Timer circuit, 10...R-S flip-flop, BL...Balance signal, Dg...Weight value data, CT...Control terminal.

Claims (1)

[Claims] 1. Memorize and display the display of the time when the switch that commands the start of holding the display of the weighing machine is operated, and change the setting of at least one of the set values of tare weight and unit price within a predetermined time from the said time. The electronic weighing machine is characterized in that when a setting change is made, the memory of the display is immediately reset, and if the setting is not changed within a predetermined time from the time, the memory of the display is automatically reset after a predetermined time has elapsed. How to hold the display in .