JPH0110575Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a display stabilization circuit in an electronic digital display scale that outputs a gravity signal corresponding to the weight of the object when it is placed on the scale. .

This type of electronic digital display scale converts the amount of mechanical displacement corresponding to the weight of the object to be weighed into an electrical signal using an A-D converter, counts this signal using a reversible counter, and displays the counted value. The weight is sent directly to the department and the weight is displayed digitally. In this case, there is a drawback that the count value on the display section is not stable until the mechanical vibration of the weighing pan completely stops. Also,
There is an inconvenience that the weight cannot be read until the vibration stops.

This idea was made based on the above-mentioned circumstances, and it records the signals inputted from the A-D converter to the reversible counter periodically with a short time difference in three or more registers, and at least When the two numbers match, this is taken out as a display stability signal and given to the weight display section, etc., so that the weight can be displayed relatively quickly and the display stability circuit makes it easier to read the weight. This is what we are trying to provide.

This invention will be explained in detail below based on the illustrated embodiments. In the figure, reference numeral 1 denotes a weight detection section, and this weight detection section 1 includes an A-D converter 2 consisting of a slit chart, a light emitting element, a light receiving element, etc.
It consists of a reversible counter 3 that counts output pulses from this A-D converter 2 and the like. The reversible counter 3 provides the respective count values to three or more registers 4a, 4b, . . . which operate sequentially with a predetermined short time difference. These registers 4a, 4b... are cleared one after another at a fixed cycle, and each time they are cleared,
The count value is accepted from the reversible counter 3. These registers 4a, 4b... are compared for their respective count values in the next comparison circuit 5, and when at least two of the count values of the registers 4a, 4b... match at the time, this is displayed as a stable signal. The weight is given to the weight display section 6 as follows. If necessary, this signal is also given to the price display section 8 via the price conversion circuit 7 at the same time.

When passing through the price conversion circuit 7, the signal is integrated with the unit price signal given from the unit price setter 9 to the unit price register 10, and the price display section 8 displays a price value based on the set unit price. Note that the reference numeral 11 in the figure is a unit price display section.

In such a configuration, when an object to be weighed is placed on the weighing pan, an unstable numerical signal in a predetermined numerical range is input to the reversible counter 3 via the A-D converter 2 while the weighing pan is vibrating. . These numerical signals are sequentially applied to registers 4a, 4b, . . . and recorded therein.
When the swing width of the weighing plate falls within a certain range, the same numerical value will be recorded in the registers 4a, 4b, . . . while the registers 4a, 4b, . . . are shifted once. When at least two registers record the same numerical value, the comparator circuit 5 outputs a display stability signal as described above, causing the weight display section 6 to display the desired weight numerical value. As mentioned above, the same signal is also given to the price display section 8 via the price conversion circuit 7.

Thus, according to this invention, there are three or more registers for recording weight signals with a predetermined time difference, and a display stability signal is generated when the values of at least two or more of these registers match. Because of this structure, a read signal with virtually no display error can be stably provided before the vibration of the weighing pan completely stops, which shortens the time it takes to read the weight and also prevents the movement of numerical values on the display. The effect is that it is easier to read because there is less flickering and no flicker. In addition, according to this invention, by increasing the number of registers that detect coincidence, it is possible to reduce the error between the displayed stable signal and the true weighing value (the weighing value when the weighing pan is completely stationary). The effect that can be obtained is obtained.

Furthermore, according to this invention, by changing the number of registers that detect coincidence, it is possible to arbitrarily change the error rate between the display stable signal and the true weighing value.
Therefore, at the design stage, it becomes possible to select the optimum error rate depending on whether the scale is a high-grade scale or a middle-grade scale. Further, according to this invention, there is an advantage that a filter effect can be exerted against noise. In other words, if, for example, seven registers are provided and a stable display signal is obtained by matching the contents of five registers, even if one register is affected by noise and the data changes, the other five registers will be affected. A correct display stability signal can be obtained by matching the contents of the registers.

[Brief explanation of the drawing]

The drawing is a block circuit diagram showing one embodiment of this invention. 1... Weight detection section, 2... A-D converter, 3...
... Reversible counter, 4a - ... Register, 5 ... Comparison circuit, 6 ... Weight display section, 7 ... Price conversion circuit, 8 ... Price display section, 9 ... Unit price setter, 10
...Unit price register, 11...Unit price display section.

Claims (1)

[Scope of utility model registration request] In an electronic digital display scale that outputs a weight signal corresponding to the weight of an object to be weighed when an object is placed on the scale, three or more display scales are used to record the weight signal with a predetermined time difference. A display stabilization circuit for an electronic digital display scale, comprising a register and a comparison circuit that outputs the numerical value as a display stabilization signal when at least two or more numerical values in these registers match.