JPH0244008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic scale, particularly an auto-range type electronic scale. The degree of precision of a scale, or ``accuracy'', is generally expressed as the ratio between the sensitivity (minimum scale) and the weighing capacity. In electronic scales, even if the sensitivity (resolution) of the weight measurement system itself is very precise, the display is digital and step-by-step, so this minimum display unit is used as the sensitivity.

For example, for an electronic scale with an accuracy of 1/8000, if the maximum weighing capacity is 3 kg, the minimum display unit is 1 g, for a 6 kg scale, it is 2 g, and for a 15 kg electronic scale, the minimum display unit is 5 g. There must be. Therefore, each electronic scale processes the output in the minimum display unit corresponding to the maximum weighing amount, and displays the output on a display device or prints it out on a printer.

Therefore, the tare weight entered into the electronic scale using the numeric keypad must also be an integral multiple of the minimum display unit. For example, on a 6Kg electronic scale, 2g, 4g, 6
Entering a tare weight such as g is allowed, but 1g, 3g etc.
Inputting a tare weight of 5g or 5g violates the above conditions, and in this case, an alarm means is activated and the input value on the display device is cleared.

On the other hand, in order to weigh light objects without reducing accuracy using an electronic scale with a large maximum capacity, the range is divided into upper and lower parts, and the minimum display unit of the lower range is set higher than the minimum display unit of the upper range. Smaller auto-range electronic scales have recently come into use. For example, in auto-range electronic scales with a maximum weighing capacity of 6 kg, the minimum display unit is 1 g for up to 3 kg (lower range), and 3 Kg - 6 Kg (range). Then it will automatically change to 2g. In this auto-range type electronic scale, processing of the tare weight input by the numeric keypad is a problem.

This invention determines the size of the tare weight input using the numeric keypad, further determines whether the value is an integral multiple of the minimum display unit specified by the size, and The purpose of the present invention is to obtain an auto-range type electronic scale that performs predetermined signal processing and outputs the signal when the number is doubled, but does not perform the above-mentioned predetermined signal processing when the number is not multiplied by an integral number. The configuration and operation will be explained in detail below.

FIG. 1 shows a functional block diagram of software or hardware of the present invention. In FIG. 1, the tare weight can be entered using the numeric keys 11 arranged on the input device 1. Furthermore, if the wind setting key 12 is pressed after pressing the specified numeric keys 11, the numeric keys 11 will be used to input the tare weight. The value entered is then entered as the tare weight.

Next, the weight determining means 2 determines which range the input tare weight falls into, and furthermore, the unit determining means 8a determines whether the tare weight is an integral multiple of the minimum display unit in that range. Determine.

When the tare weight is an integral multiple of the minimum display unit in that range, the output means 4a performs predetermined signal processing and outputs it, and when it is not an integral multiple, the inhibiting means 3b is output. Therefore, input of the tare weight to the output means 4a is prohibited, and an alarm is issued by the alarm means 4b.

Fig. 2 is a flowchart of one embodiment of the present invention using software, and Fig. 3 is a block diagram in which the software in Fig. 2 is replaced with equivalent hardware. ,
For weights up to 3Kg (lower range), the minimum display unit is 1g.
From 3Kg to 6Kg (upper range), the minimum display unit is 2g, and its operation will be explained according to FIGS. 2 and 3. First, when you enter the tare weight using the numeric keypad 11 (F11), the pressed tare weight is displayed on the number display 24 of the display device (F12), and then by pressing the wind setting key 12, the tare weight is input. (F13)

The input tare weight is determined by the weight determining means 2 which receives a comparison command output by pressing the wind setting key 12.
is activated and it is determined whether it belongs to the lower range below the range switching point weight (3Kg) or the upper range above it (F2a), and the answer is lower range (affirmative answer)
When obtained, the minimum display unit of that range is 1g, so all numeric keypad inputs have the minimum display unit, that is, it is an integral multiple of 1g, so prohibition means 3b (AND circuit), the tare weight is input to the output means 4a, and the output means executes processing for providing it to the calculation of the electronic scale, which will be described later. Light.

If an upper range answer (negative answer) is obtained, the minimum display unit for this range is 2g, so the unit determination means 3a determines whether the entered tare weight is an integral multiple of 2g. Discern. When the unit determination means 3a gives a positive answer, that is, when the entered tare weight (for example, 3012g) is an integral multiple of 2g, this tare weight is passed through the prohibition means 3b and input to the output means 4a, and the tare weight is input to the output means 4a through the prohibition means 3b. The tare weight setting lamp on the setting display section 52 is turned on.

When the unit determination means 3a gives a negative answer, that is, when the entered tare weight (for example, 3011 g) is not an integral multiple of 2 g, the inhibiting means 8b (AND circuit) is closed and the tare weight entered using the numeric keypad 11 is returned. Inputting the weight to the output means 4a is prohibited, and
The alarm means 4b is activated to issue an alarm (for example, sounding a buzzer) (F4b).
In this case, the operator can clear the display on the number display 51, enter an appropriate tare weight (for example, 3012 g) using the numeric keypad 11, and press the wind setting key 12.

Incidentally, the output means 4a includes a converter 40 that converts the tare weight input using the numeric keypad 11 into a count value.
Addition unit 41 that adds the count value of the tare weight and the count value of the true zero point (count value when nothing is weighed) and the addition result value of the addition unit 41, or weighing with a weighing device (Sez shown in the figure) It is equipped with a temporary zero point register 42 that stores the count value of the tare weight, and when the object to be weighed is placed on the weighing device, the weighing device outputs a count value proportional to the weighed weight, and this count value and The net weight is calculated based on the storage contents of the temporary zero point register 42. Further, the output means 4a operates as follows.

That is, based on an affirmative answer from either the weight discrimination means 2 or the unit discrimination means 8a, the input value by pressing the key on the numeric keypad 11 is converted into a count value in the conversion section 40 (F40), and the addition section 41 converts the input value into a count value. The count value of the temporary zero point is calculated by adding the count value of the current zero point (F41), and is stored in the temporary zero point register 42 (F42a).

The tare weight subtraction key 13 has the function of storing the count value of the tare weight calculated by the weighing device in the temporary zero point register 42, and the function of canceling the tare weight subtraction, which will be described later.

Further, at the same time as or before the processing by the output means 4a, the tare weight reduction lamp of the tare weight reduction display section 52 is turned on (F52a), The light is turned off by a tare cancellation signal generated by pressing the tare key 13 when nothing is being weighed.

The tare weight input as described above is processed in the same way as the tare weight input by directly placing the tare on the weighing device, as shown in the flowchart of FIG. In other words, the true zero point count value is subtracted from the count value stored in the temporary zero point register to obtain the count value corresponding to the tare weight (F60), and the result is converted into a digital number obtained by the signal conversion means. (F80) and displays it on the tare weight display section (shown in the figure) (F53).

The signal converting means is means for processing the count value corresponding to the tare weight inputted from the weighing device or from the numeric keypad so as to obtain the minimum display unit suitable for each range.

It should be noted that although a means capable of obtaining more accurate results without using complex processing such as rounding is used as the signal conversion means, the details will be omitted.

For example, on an autorange electronic scale with a maximum weighing capacity of 30Kg, the minimum display unit is 5g for weights up to 15Kg (lower range), and for weights from 15Kg to 30Kg (upper range).
If it is 10g, press numeric key 1 as shown in Figure 5.
a first unit determination means 3a' for determining whether or not the tare weight set at 1 is an integral multiple of 5 when the tare weight is 15Kg or less (lower range); Second unit determination means 3 for determining whether it is an integer multiple of 10 when up to (upper range)
a'', and when the first or second unit discriminating means gives an affirmative answer, the tare weight set above is inputted to the output means 4a via the inhibiting means (AND circuit) 3b, and a negative answer is given. and prohibited means (AND circuit)
3b is closed and the tare weight entered above is outputted to the means 4.
Prohibiting input to a and alarm means 4
Activate b. Furthermore, if a range with three or more stages is provided, an appropriate unit discriminating means may be provided.

Incidentally, when the unit discriminating means 3a, 3a', 3a'' provides a negative circuit, the display value of the numeric display 51 may be flashed or the display value may be cleared.

As explained above, the present invention includes a weight determining means to determine to which range the tare weight inputted from the numeric keypad belongs, and a unit determining means to determine whether the tare weight is the minimum display of the range. It is determined whether the input is an integer multiple of the unit, and if the input is an integer multiple of the minimum display unit of the range, the output means processes it for use in the calculation of the electronic scale, and then If not, inputting the tare weight to the output means is prohibited, and the alarm means is configured to issue a warning. This prevents tare weight from being set in an inappropriate unit in an auto-range electronic scale. In addition to reliably preventing the setting of an inappropriate tare weight, the operator can be warned to change the setting.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram on software or hardware showing the basic concept of this invention, Fig. 2 is a flowchart showing one embodiment of implementing this invention using software, and Fig. 3 is a functional block diagram of software or hardware. A block diagram in which the software shown in the figure is replaced with equivalent hardware, Figure 4 is a flowchart up to displaying the tare weight of the set tare weight, and Figure 5 is a block diagram of the main part of another embodiment. be. 11...Numeric keypad, 2...Weight determination means, 3a, 3
a', 3a''...Unit discrimination means, 3b...Prohibition means, 4a
...Output means, 4b...Alarm means.

Claims (1)

[Claims] 1. An input device for inputting a tare weight, a weight determining means for determining which range of the scale the tare weight inputted by the input device falls into, and a range in which the tare weight was determined by the weight determining means. unit discriminating means for discriminating whether or not the display unit is an integral multiple of the minimum display unit; alarm means for issuing an alarm when the unit discriminating means determines that the display unit is not an integral multiple of the minimum display unit; means for clearing the tare weight input by the input means when an alarm is issued by the alarm means; and means for clearing the tare weight input by the input means when the unit determination means determines that it is an integral multiple of the minimum display unit; An auto-ranging electronic scale comprising an output means for converting and storing a count value in a converting section and calculating a net weight from the count value and a weighing count value of an object to be weighed by a scale device.