JPH029288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for switching the measurement capacity of an electronic scale, and more specifically, a method for switching the display resolution of an electronic scale by changing the minimum display value while maintaining a constant maximum weight. The present invention relates to a switching method and a switching method for changing the maximum weight by changing the minimum display value under a constant display resolution.

Conventionally, an electronic scale has a constant display resolution, and it has been necessary to use different scales depending on the purpose of use.

In other words, depending on the item, the weighing accuracy that corresponds to the item is required, but when using a general scale with normal accuracy, if the user does not need much accuracy, the user can check the weighing accuracy that is displayed on the scale's display. In addition, weighing data or prices, etc., were rounded appropriately, and the scale had to be replaced when performing more accurate measurements, reducing the efficiency of weighing work and limiting the adaptability of the scale. .

In addition, conventional electronic scales have a fixed maximum weighing capacity and cannot be changed depending on the item to be weighed, so if the weight of the items to be handled varies over a wide range, heavy items exceeding the maximum weighing capacity cannot be weighed. Moreover, in the case of light items, sufficient measurement accuracy could not be obtained.

Therefore, the present invention expands the adaptability of the electronic scale by making it possible to change the display resolution and maximum weighing capacity of the electronic scale, and by selectively using the two. The aim is to improve the efficiency of

The present invention achieves the above object by converting the weighing signal from the weighing section into a digital signal, inputting it to the central processing unit as an internal count number, and performing a predetermined calculation in the central processing unit.
In an electronic scale that displays this calculation result as a weight value on the display, when the switching means commands to switch the minimum display value, the internal count input to the central processing unit is changed to the minimum display value that is commanded to switch. A first switching method for switching the display resolution while keeping the maximum weight constant by rounding the value with a rounding count number proportional to the value and calculating the minimum display value based on the rounded result, and a switching means. When a switch of the minimum display value is commanded by Round by the count number,
By calculating the minimum display value from this rounded result to obtain a weight value, a second switching method for switching the maximum weight while keeping the display resolution constant is provided, and these switching methods can be used as an alternative. It is characterized by being selected.

The switching means may be a slide switch, a toggle switch, or a key operation of a numeric setting key on an input device, and can selectively switch between the resolution on the display and the maximum weighing capacity as well as the minimum display value. It is a switch.

Changing the count number to be inversely proportional to the minimum display value mentioned above means that when the minimum display value is increased, the internal count number is reduced in inverse proportion to the increase rate, and when the minimum display value is decreased, , expansion in inverse proportion to the rate of decrease.

The means for changing the internal count number include changing the input voltage to the load cell of the weighing section of the scale, changing the amplification degree of the amplifier circuit, or digitally expanding or contracting the internal count number. The method used is also optional.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, in which a minimum display value switch for changing the resolution and a minimum display value switch for changing the maximum weight are made independent.

In the figure, 1 is the input device of the electronic scale, 2 is the amplifier, and 3
A/D converter 4 is a central processing unit, 5 is a display unit 6
7 is a minimum display quality changeover switch for changing the resolution, and 7 is a changeover switch for changing the maximum weight.

The input device 1 includes a weighing section 1a and an operation section 1b, and the weighing section 1a converts the weight of the product into a predetermined electrical signal and outputs it to the amplifier 2.

The operation unit 1b allows the central processing unit 4 to input various data such as unit price and tare weight by operating various keys such as a number setting key and a clear key.

The amplifier 2 amplifies the electrical signal from the weighing section 1a and inputs it to the A/D converter 3.

The A/D converter 3 converts the electrical signal into a digital signal and inputs it as an internal count number A to the central processing unit 4.

The central processing unit 4 stores the input data from the operation unit 1b, the calculation unit 4a that processes input data, the rounding count number corresponding to the minimum display value selected by the changeover switches 6 and 7, and its constant. It consists of a storage section 4b, a calculation section 4a, and a control section 4c that controls the operation of the storage section 4b.

A minimum display changeover switch 6 for changing the resolution is provided in the operation unit 1b, and is connected to the central processing unit 4, and the minimum display value is changed by key operation of the number setting key, and the minimum display value is changed. A rounding count number corresponding to the value is determined.

A minimum display changeover switch 7 for changing the maximum weight is similarly provided in the operation unit 1b and connected to the central processing unit 4, and the minimum display value is changed by key operation of the numeric setting key, The internal count number A to be input to is expanded or reduced by changing the amplification degree of the amplifier 2.

The calculation result in the calculation unit 4a of the central processing unit 4 is
The information is input to the display section 5, and the weight or price of the product is displayed.

In general, the resolution on the display is the maximum scale/minimum display value...
It is also expressed by equation (1), and when expressed as the number of counts in the central processing unit 4, it becomes the maximum internal count number/rounded count number...Equation (2).To change the resolution by switching the minimum display value It is sufficient to keep the maximum weight constant, and to change the maximum weight by switching the minimum display value, it is sufficient to keep the resolution on the display constant.

If we explain the resolution switching method by switching the minimum display value using the flowchart in Figure 2, S ₁ ,
S ₂ and S ₃ are determination processing steps of the central processing unit 4, and the determination is performed by switching the minimum display value changeover switch 6.

Also, a ₁ , a ₂ , and a ₃ in steps S ₄ , S ₆ , and S ₈ are rounded counts corresponding to the minimum display values b ₁ , b ₂ , and b _{3 ,} respectively, and b ₁ /a ₁ =b ₂ It is set based on the relational expression /a ₂ =b ₃ /a ₃ .

Then, in the central processing unit 4, when the minimum display value is set to _b1 by switching the minimum display value changeover switch 6, the judgment processing step _S1 opens, and then, in step _S4 , the internal count number A to be input is set to the minimum display value. Change the rounded count number a ₁ corresponding to b ₁ to the rounded display count number a ₁ ′, and then step
In S ₅ , the display count number a ₁ ′ and the minimum display value
b ₁ is integrated, and the result is displayed on the display unit 5 as a weight.

Similarly, when the minimum display value is switched to _b2 , the judgment processing step _S2 opens, then in step _S6 the internal count number A is rounded by the rounding count number _a2 , and then in step _S7 the display count is The number a ₂ ' and the minimum display value b ₂ are integrated.
When the minimum display value is switched to _b3 , the judgment processing step _S3 opens, and in step _S8 , the internal count number A is rounded to the rounding count number _a3 , and further, in step _S9 , the display count number _a3 ' is rounded. and the minimum display value _b3 are integrated.

That is, for a scale with a maximum internal count input to the central processing unit 4 of 30,000 and a maximum weighing capacity of 3 kg, if the minimum display values are set to 1 g, 2 g, and 5 g, respectively, the above-mentioned
From equations (1) and (2), maximum weight = minimum display value x maximum internal count number / rounded count number. When set to 1g, the rounding count number is 10, and when the minimum display value is 2g, the rounding count number is set to 20. Similarly, when the minimum display value is 5g, the rounding count number is set to 60. The rounding count number may be increased in proportion to the increase in the display value, and even when the minimum display value is decreased, it may be reduced in proportion.

Next, the method of changing the maximum weight by changing the minimum display value will be explained using the flowchart in Figure ₃ .
S ₂ ' and S ₃ ' are steps for determination processing within the central processing unit 4, and the determination is performed by switching the minimum display value changeover switch 7.

Also, k in steps S ₄ ′, S ₆ ′, and S ₈ ′ is the minimum display value.
This is a rounded count number corresponding to d ₁ , d ₂ , and d ₃ , and is constant for any of the minimum display values d ₁ , d ₂ , and d ₃ . Then, in the central processing unit 4, the minimum display value changeover switch 7 is operated to open a determination processing step _S1 ' to set the minimum display value to _d1 , and then, in step _S4 ', the internal count number A is input.
is rounded by the rounding count number k and changed to the display count number c, and further, in step _S5 ', the display count number c and the minimum display value _d1 are multiplied, and the result is displayed as the weight on the display section 5. be done.

Similarly, when the minimum display value is switched to d ₂ , the judgment processing step S ₂ ′ is opened, a rounding operation is performed in step S ₆ ′, and the display count number c and the minimum display value are determined in step S ₇ ′. The value _d2 is accumulated.

When the minimum display value is switched to _d3 , the judgment processing step _S3 ' is opened, a rounding operation is performed at step _S8 ', and the display count number c and the minimum display value _d3 are determined at step _S9 '. It is accumulated.

That is, the maximum internal count number input to the central processing unit 4 is 30000, and the minimum display value is 1g, 2g, and 5, respectively.
When set to g, the rounding count is constant regardless of the size of the minimum display value.For example, by setting it to 10, the resolution becomes constant according to equation (1) above, and when the minimum display value is set to 1g, the maximum Weighs 3kg,
If 2g is selected, the weight will be 6kg, and if 5g is selected, the weight will be 15kg.

In switching the minimum display value, the internal count A input to the central processing unit 4 is set to be 2g even before inputting to the central processing unit 4, compared to when the minimum display value is 1g. If input is reduced to (1/2) and switched to 5g, (1/2)
5), the central processing unit 4
The amplification degree of the amplifier 2 is changed by a control signal from the control section 4c.

For the minimum display values b ₁ , b ₂ , b ₃ , d ₁ , d ₂ , d _3, numerical values expressed as (1×10 ⁿ ), (2×10 ⁿ ), and (5×10 ⁿ ) were used. is not limited to this (integer x
Any numerical value can be used as long as it is 10 ⁿ ).

Furthermore, in the above embodiment, the changeover switch 6
and 7 are dedicated minimum display values 1g, 2g, 5, respectively.
Although it is equipped with the number of switches corresponding to g..., it is also possible to combine both switches into one each. In that case, the switch to be switched when changing the resolution or when changing the maximum weighing amount is Provided separately.

In addition, as in the above embodiment, when the number of switches corresponding to the minimum display value 1g, 2g, 5g, etc. for changing the resolution and changing the maximum weight is provided, the minimum At the same time as the display value is switched, other switches are turned off, and the minimum display value is selectively switched.

Since the present invention is constructed as described above, the first switching method is such that the maximum weight is constant and the display resolution is switched in response to switching the minimum display value, and the second switching method is that the display resolution is constant and the maximum weight is switched. The switching method can be selected as an alternative.

Therefore, by selecting the first switching method, it is possible to select the resolution (weighing accuracy) according to the nature of the item, and by selecting the second switching method, it is possible to select the resolution (weighing accuracy) that corresponds to the nature of the item. Even for a wide range of items, including heavy items, it is possible to select the maximum weighing weight according to the weight of the item.

Therefore, the range of items that can be weighed with a single scale is greatly expanded, costs are reduced compared to the conventional case of using multiple scales, and no extra space is required, making weighing work extremely easy. It becomes possible to carry out the process efficiently.

Thus, the intended purpose can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic scale according to the present invention;
FIG. 2 is a flowchart showing the resolution changing operation in the central processing unit, and FIG. 3 is a flowchart showing the maximum weighing amount changing operation in the central processing unit. In the figure, A: internal count number, a ₁ , a ₂ , a ₃ ,
k...Round count number, _a'1 , _a2 ', _a3 ', c...Display count number, _b1 , _b2 , _b3 , _d1 , _d2 , _d3 ...Minimum display value, 4 ... Central processing unit, 6, 7 ... Minimum display value changeover switch.

Claims (1)

[Claims] 1 After exchanging the weighing signal from the weighing section to a digital signal and inputting it to the central processing unit as an internal count number, and performing a predetermined calculation in this central processing unit,
In an electronic scale that displays this calculation result as a weight value on the display, when the switching means commands to switch the minimum display value, the internal count input to the central processing unit is changed to the minimum display value that is commanded to switch. A first switching method for switching the display resolution while keeping the maximum weight constant by rounding the value with a rounding count number proportional to the value and calculating the minimum display value based on the rounded result, and a switching means. When a switch of the minimum display value is commanded by Round by the count number,
By calculating the minimum display value from this rounded result to obtain a weight value, a second switching method for switching the maximum weight while keeping the resolution of the display constant is provided, and these switching methods can be used as an alternative. A method for switching measurement ability, characterized by selecting: