JPS633249B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of displaying weight values in an electronic weighing machine, and proposes a display method that can display weight values that are easy to read even when weighing moving objects. be.

In other words, the display method of the present invention displays the latest weight value as the weight value until the weight value reaches a stable point after loading the weight, and once the weight value reaches the stable point. It is characterized by holding the weighed value at the time when a stable point is reached until the weighed value falls below a predetermined weight value, and displays the held weighed value as a weight value. A display method of the invention will be explained based on one embodiment.

FIG. 1 shows a block diagram of a digital baby scale, where 1 is a load converter such as a load cell, and 2 is an amplifier that amplifies the analog signal A output from the load converter 1. 3 is a clock oscillator that outputs a clock signal CL repeatedly at a constant period T, and 4 is an analog-to-digital converter, which converts the output signal of the amplifier 2 into a digital value signal D every time the clock signal CL is input.
Convert to 5 is a stable point detector which compares the latest digital value signal Dn and the previous digital value signal Dn- ₁ , and if the two match, the output is inverted to logic level "H" for a predetermined period of time. 6a is a comparator that compares the digital value d output from the setting device 6b with the digital value signal D, and the digital value signal D is the digital value d.
If the value is below, the output will be at logic level “H” for a predetermined period of time.
to be reversed. 7 is an R-S flip-flop whose set input S is the output level of the stable point detector 5, and whose reset input R is the output level of the comparator 6a. Reference numeral 8 denotes a latch circuit consisting of a shift register, which holds and outputs the digital value signal D of the analog-to-digital converter 4 every time the latch signal B is input until the latch signal B is input next.
Here, the latch signal B is configured to use the output signal of an AND gate 9 whose input signals are the output Q of the R-S flip-flop 7 and the clock signal CL. 10 is a display device that digitally displays the data output from the latch circuit 8 as a weight value.

Load the heavy object to be measured on the load converter 1, and
_When the input signal of the digital converter 4 changes as shown in FIG. A clock signal CL as a latch signal is generated, and the display device 10 displays the output signal of the latch circuit 8 (FIG. 2b) which outputs the latest weight value data as a weight value. When the output of the stable point detector 5 is inverted to logic level "H" [time _t1 ], the R-S flip-flop 7 is set and the AND gate 9 is turned off, and the latch circuit 8 is turned off regardless of the digital value signal D. The weight value data at time _t1 is held until the R-S flip-flop 7 is reset. Also, a comparator 6 compares the digital value signal Da corresponding to a predetermined weight value (G ₁ ) near the zero point with the latest digital value signal Dn.
At time _t2 when Dn≦Da, the output level of a is inverted to logic level "H", the R-S flip-flop 7 is reset, and the output signal of the latch circuit 8 again outputs the latest weighing value data. It becomes like this.

That is, until time t ₁ , it can be confirmed from the display contents of the display device 10 that the weight value is changing in an increasing direction, and from time t ₁ to time t ₂ , even if the digital value signal D changes. The display content of the display device 10 is such that the digital value Db at the stable point is fixed and displayed as a weight value, and when time t ₂ is reached, the fixation is released to prepare for the next weighing. Therefore, even if the weight is moving on the weighing plate, such as a baby, the time from time t ₁ to time t ₂ can be used to obtain a weighed value with a certain level of accuracy when placing the heavy object on the weighing plate. It has good operability and can be easily continued at any time from when it is placed on the tray (not shown) until it is taken down.

In the above embodiment, the stable point detector 5 detects the latest digital value signal Dn and the previous digital value signal Dn.
− ₁ , it is determined that a stable point has been reached, but the condition for determining the stable point is that the latest digital value signal Dn and the previous digital value signal
It may be possible to determine that a stable point has been reached only after detecting that Dn− ₁ matches multiple times in a row, and the condition for determining the stable point is based on the degree of movement of the object to be weighed or It is selected as appropriate depending on the degree of movement.

Furthermore, in the above embodiment, the comparator that detects when the weighed value has reached a predetermined weight value or less is an analog comparator.
Although digital processing was performed at the subsequent stage of the digital converter 4, as shown in FIG. 3 as another example,
The threshold level of the comparator 6a' is set by the setter 6b' which outputs an analog signal A corresponding to a predetermined weight value, and it is determined from the output signal level of the amplifier 2 that the weight value has reached the predetermined weight value or less. It is possible to detect it. In addition, in FIGS. 1 and 3, the means for detecting the stable point and the means for releasing the fixation of the latch circuit 8 are processed by digital circuits or analog circuits, but one is configured with a digital circuit and the other is an analog circuit. It can also be constructed from In the above embodiment, the predetermined weight value G ₁ is a weight value near the zero point, but it may be a zero point.

As explained above, according to the weighed value display method according to the present invention, once the weighed value reaches a stable point, the weighed value at that stable point is maintained for a period of time until the latest weighed value reaches a predetermined weight value or less. , because it is displayed fixedly,
Even for objects that move on the tray, such as a baby, the weight value can be displayed with a certain degree of accuracy until the weighing is complete, and operability is significantly improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the weighing value display method according to the present invention, and FIG. 1 is a configuration diagram of a baby scale, and FIG.
Figures a and b are waveform diagrams of the load transducer output signal and the latch circuit output signal, and Figure 3 is a configuration diagram of another embodiment. 1... Load converter, 4... Analog/digital converter, 5... Stability point detector, 6a... Comparator,
7...R-S flip-flop, 8...Latch circuit, 10...Display device.

Claims (1)

[Claims] 1 Load the weight to be weighed and display the latest weighing value as the weight value until the weighing value reaches a stable point.
Once the weighed value reaches a stable point, the weighed value at the time the stable point is reached is held until the latest weighed value falls below the predetermined weight value, and the held weighed value is displayed as the weight value. A method for displaying weight values in an electronic weighing machine, characterized by the following.