JPS6146425Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an electronic digital display scale that converts the load applied to the weighing section into an electrical signal and displays various data such as weight and price on the data display section. The present invention relates to a display fixing device that fixes the display by holding the load data for a necessary time after removing the load of the section.

Conventionally, this type of display fixing device has been known to hold data such as weight and price on the data display section by pressing a button. Since the displayed contents are not cleared, it interferes with subsequent weighing, and the button operation has to be performed each time the weighing is performed, which is very troublesome and inefficient.

This idea was made to improve the above situation, and its purpose is that when the load is removed from the weighing section, various data such as the weight and price of this load can be retrieved without the need for any special operations. It automatically holds the load, and when a new load is placed, it automatically releases the hold operation and displays the new load as soon as the weighing is stable.This allows for efficient weighing. An object of the present invention is to provide a display fixing device for an electronic digital display scale.

This invention will be explained in detail below based on the illustrated embodiments. In the figure, reference numeral 1 denotes a weighing section such as a load cell, and an analog signal A corresponding to the load detected here is input to an AD converter 2 and converted into a converted load signal W in a digital quantity.
A reversible counter (not shown) is built into the AD converter 2, and a signal representing the contents of this reversible counter is the conversion load signal W. The conversion load signal W is input to the first input terminal of the AND gate 8, and the control signal C output from another AND gate 6 is input to the second input terminal of the AND gate 8. Further, a signal J, which will be described later, from the AD converter 2 is input to the first input terminal of the AND gate 6, and a stable signal S output from the weighing section 1 is input to the second input terminal of the AND gate 6. is entered.

The stability signal S becomes "1" at a binary logic level when the analog signal A outputted by the load applied to the weighing section 1 stops changing, that is, when the weighing section 1 is in an electrically stationary state. This is a signal that is output as a signal. The output of AND gate 8,
That is, a signal synchronized with the conversion load signal W is input to the shift register 12 via the OR gate 9 and temporarily stored in the shift register 12.
The output of this shift register 12 is the weight display section 15.
In addition to being sent to and displayed, it is also sent to the first input terminal of the calculation section 13. A unit price signal UP set by a unit price setter 14 consisting of a numeric keypad or the like is input to the second input terminal of the calculation unit 13. Therefore, in the calculation unit 13, a price calculation operation using the conversion load signal W and the unit price signal UP is executed,
A price signal P representing the calculated price is output and sent to the price display section 16, and the price is displayed. Note that the unit price signal UP is also sent to the unit price display section 17 and displayed.

Next, the configurations of the hold signal H generation circuit and the hold signal release circuit, which are the gist of this invention, will be explained. First, the above-mentioned signal J is generated when the content of the reversible counter in the AD converter 2 changes from, for example, greater than the content representing the weight of 10g to content less than the content representing the weight of 10g, that is, the content of the reversible counter is less than or equal to 10g. If it is, it will be output as a “1” signal, otherwise (if it is 10g or more)
This signal is output as a “0” signal.
is input to the first input terminal of the AND gate 6 via the inverter 5 as described above. and,
The control signal C output from the AND gate 6 is input to the first input terminal of the AND gate 11 via another path and the inverter 10, and the second input terminal of the AND gate 11 is input to the shift register. 12 output signals are inputted, and a signal obtained from the output (reset signal) R of a reset button provided in the unit price setting device 14 via an inverter 18 is further inputted to the third input terminal.

The output signal of the inverter 10 is a hold signal H, and when this hold signal H is a "1" signal, the AND gate 11 is opened and the output of the shift register 12 (that is, the load that was initially applied to the weighing section 1) is opened. ) for the conversion load signal W from the AND gate 11 to the OR gate 9 to the shift register 12.
~ It can be held by a hold circuit formed by an AND gate 11. Note that the signal K input to the third input terminal of the AND gate 8 changes after the load applied to the weighing section 1 is removed and the analog signal A output from the weighing section 1 starts to change in the negative direction. This is a signal that is output as a "0" signal from the determining section (not shown) until the stable signal S disappears (that is, the stable signal S is output and becomes a "1" signal). This signal K prevents the final weighing value of the load, which was stored in the shift register 12 before the load removal, from being cleared when the load is removed.

Next, the operation of the above embodiment will be explained. When a unit price is set using the unit price setter 14 before applying a load to the weighing section 1, a unit price signal UP is output and input to the calculation section 13 and the unit price display section 17. As a result, the set unit price is stored in the calculation section 13, and the set unit price is displayed on the unit price display section 17. Next, weighing section 1
When a load of, for example, 100 g is applied to the weighing section 1, an analog signal A corresponding to the load is outputted from the weighing section 1 and inputted to the AD converter 2. The contents of the reversible counter (not shown) in the AD converter 2 are the analog signal A.
The signal representing this content is output as a digital conversion load signal W and input to the AND gate 8.

Also, the signal K which is the third input of the AND gate 8
is a "1" signal, but the stability signal S is a "0" signal while the weight is not stable, so the control signal C from the AND gate 6, which is the second input of the AND gate 8, is "0" during this time. Since it is a signal, the conversion load signal W is not output from the AND gate 8.
When the load applied to the weighing section 1 becomes stable, the stable signal S is input as a "1" signal to the AND gate 6, and since the signal J during this time is "0", it is changed to a "1" signal by the inverter 5. Since it is inverted and input to AND gate 6, AND gate 6
A control signal C from the input gate 8 is input to the AND gate 8 as a "1" signal. Then, the conversion load signal W of 100 g loaded on the weighing section 1 is output from the AND gate 8, inputted to the shift register 12 via the OR gate 9, and stored. shift register 1
The conversion load signal W of 100g inputted to the weight display unit 15 is sent to the weight display unit 15 and displayed, and at the same time, the conversion load signal W of 100g inputted to the weight display unit 13
The price signal P is also sent to the arithmetic unit 13 and multiplied by the set unit price to calculate the price, and this price signal P is displayed on the price display unit 16.

In this state, the control signal C output from the AND gate 6 passes through another path to the inverter 10.
In other words, the hold signal H, which is the output signal of the inverter 10, becomes a “0” signal.
signal, and therefore the hold circuit is not activated.

Next, if, for example, a 95g load is removed from a load weighing 100g so that the weight of the remaining load becomes 10g or less, the analog signal A output from the weighing section 1 will start to change in the negative direction, but the load Since the stable signal S changes to a "0" signal at the same time as the load is removed, the control signal C from the AND gate 6 becomes a "0" signal, and the stable signal S changes after the load removal operation.
The signal K is a “0” signal until it changes to a “1” signal, and the conversion load signal W from the AND gate 8
is not output, and the control signal C, which is a "0" signal, is inverted by the inverter 10 and becomes "1".
Since the hold signal H of the signal is output and the output of the inverter 18 is also a "1" signal, the AND gate 11 - OR gate 9 - shift register 12 -
A hold circuit is formed from the AND gate 11. Also, after a while after removing the load, the weight of the remaining load stabilizes and the stability signal S changes to "1" signal, but by the time it stabilizes, the weight of the remaining load is less than 10g, so the signal J changes to "1". 1” signal,
Since the output of the inverter 5 becomes "0" and therefore the control signal C is a "0" signal, the hold signal H is output as a "1" signal in the same way as above, and the hold signal H is a "1" signal. The signal is output and a hold circuit is formed. Therefore, a hold circuit is formed at the same time as the load is removed, and the shift register 12
The final weighing value (100g) stored in
The weight is displayed on the screen, and the price is displayed on the price display section 16.

Then, when the hold is no longer necessary, when the reset button is operated, the reset signal R is output as a "1" signal, so that the inverter 1
Since the output signal of 8 becomes "0" and the AND gate 11 is closed, the hold circuit is no longer formed and the contents of the shift register 12 are cleared. In this way, when a part of the load is removed after weighing the load and the weight of the remaining load becomes less than a predetermined weight (10g), the hold circuit is activated to automatically hold the weight and price, and the reset button is pressed. Press to release the hold. Note that even if the entire load of 100 g is removed and the remaining load weight becomes 0 g, it is of course possible to hold it in the same manner as above.

Also, if the remaining load weight of the removed load is not less than the predetermined weight (10g), for example, if a 50g load is removed in the above example, the stability signal S will be held as a "0" signal immediately after removal. , the signal J remains as a "0" signal and is not output, so the hold is released when the stable signal S becomes stable and becomes a "1" signal, and the remaining load weight of 50g is displayed instead of the initial load weight. It is displayed in section 15.

In the above embodiment, a special reset button is provided on the unit price setting device, but a numeric keypad or the like may also be used. Further, although the amount of load remaining after the load is removed is set to 10 g or less, this amount is also arbitrary.

Further, the circuit for generating the stability signal S may be of an analog type or a digital type, and in short, any circuit that can detect stability of measurement may be used. In addition, in the above embodiment, the case where both the weight and price are fixed as the data of the load loaded on the weighing section was described, but it is also possible to hold either the weight or the price, or the electronic Of course, there is no problem even if the display of various data such as the weight, number, unit price, weight, etc. of the digital counting scale is fixed.

As described in detail above, this device automatically outputs a hold signal to hold the display contents of the data display section when the load on the weighing section returns to a predetermined value or less, so that the actual length can be reduced. In addition to being able to automatically hold and place the displayed content,
Since no special operation is required for holding, it can be operated easily and quickly, and since the hold can be released by pressing a specified key, the next weighing can be carried out quickly, making it extremely efficient. It is possible to perform accurate measurements.

[Brief explanation of the drawing]

The drawing is a block diagram showing one embodiment of this invention. 1... Weighing section (stability detection section), 2... AD converter (intra-set value detection section), 9... OR gate (hold circuit), 11... AND gate (hold circuit),
12...Shift register (hold circuit), 13
... Calculation section, 14... Unit price setting device (hold release operation section), 15... Weight display section, 16... Price display section, 17... Unit price display section.

Claims (1)

[Scope of utility model registration request] In an electronic digital display scale that measures the weight of an object to be weighed and digitally displays data such as the weight and price of the object to be weighed, a stability detection unit that detects stability of the weighing value and outputs a weighing stability signal; a set value detection section that detects that the weighing value is below a predetermined set value and outputs a detection signal; and when the weighing stability signal is output, the weighing value data is taken in and the weighing stability signal is output. When not, the captured weighing value data is retained, and during the period when the within-set-value detection section is outputting a detection signal, the weighing value data that has already been fetched is retained regardless of the presence or absence of the weighing stability signal. An electronic digital device comprising a hold circuit, a display device that displays based on measured value data in the hold circuit, and a hold release operation section that releases the holding operation of the hold circuit by key operation. Display fixing device for display scales.