JPH0313532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for taring an electronic scale.

Prior Art Figures 3 and 4 show conventional electronic scales.
The load signal converted into an electric signal by the load cell 1 is digitally converted by the A/D converter 2, and the total weight value G is subtracted by the tare weight in the subtraction unit 3 and displayed as a net weight value on the display unit 4. Reference numeral 5 denotes a processing unit that provides a tare amount to the subtraction unit 3, and a tare memory 6, a numeric keypad register 7, a one-touch tare button 8, and a numeric keypad tare button 9 are connected to the outside.
FIG. 4 shows a routine related to the one-touch tare button 8 in the processing section 5, in which the processing section 5 checks [a-1] whether the one-touch tare button 8 is operated or not; When an operation is detected, the total weight value G of the A/D converter 2 and the reference weight “1e” [However, “1e” is a positive weight value larger than zero]
[a-2], and if "total weight value ≧ 1e" is detected in [a-2], the contents of the tare memory 6 are updated to the total weight value at that time [a-3] and the Break out of the routine shown in Figure 4. In addition, when "total weight value <1e" is detected in [a-2], the contents of the tare memory 6 are updated to the numerical value previously set in the numeric keypad register 7 using the numeric keypad 10.
-4] to exit the routine shown in FIG. In this way, the contents of the tare memory 6 are updated with [a-3] or [a-4], and the contents of the tare memory 6 are normally given as the tare amount from the processing section 5 to the subtraction section 3. .

In this way, depending on the size of the total weight, you can select and carry out "weighing tare" or "set value tare" using the numeric keypad, but in the following cases, when operating the one-touch tare button 8, "set value tare" is selected. Since "tare" cannot be performed, a numeric keypad tare button 9 is provided separately from the one-touch tare button 8.

The case where the above-mentioned numeric key setting tare subtraction cannot be carried out is when the load cell 1 is loaded with the raw material 12 in the container 11 as shown in FIG. 5, and the total weight value is "1e" or more. In other words, even if the weight of the container 11, which is a known weight, is set in the numeric keypad register 7 using the numeric keypad 10 and the one-touch tare button 8 is operated, in the routine of FIG.
→ [a-2] → [a-3] and [a-4] is not executed, so the contents of the tare memory 6 are
1 and the raw material 12, and the display unit 4 simply displays the net weight = "zero". Therefore, as mentioned above, the numeric keypad tare button 9 is provided, and when this button 9 is operated, the contents of the tare memory 6 are updated to the contents of the numeric keypad register 7 regardless of the size of the total weight. Section 5 is configured.

Problems to be Solved by the Invention In such a conventional tare erase method, there are cases where "set value tare subtraction" cannot be performed unless two buttons, the one-touch tare button 8 and the numeric keypad tare button 9 are used. It is something that occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tare erasing method that can selectively perform "weighing tare subtraction" and "set value tare subtraction" in any usage state using a single switch.

Means for Solving the Problems The tare erasing method of the present invention determines whether the net weight after tare erasing is greater than or equal to a reference value when the operation of the tare instruction switch is detected. If the net weight does not exceed the reference value, the stored tare amount is updated to the gross weight before erasing the tare and the tare subtraction is performed, and if the net weight does not exceed the reference value, the stored tare amount is updated to the numerically set weight. It is characterized by performing tare subtraction.

Function With this configuration, the memorized tare amount is updated according to the net weight value after tare deletion, rather than the gross weight value as in the conventional method, so that a single tare instruction switch is required. .

Embodiment Hereinafter, a method for erasing a tare weight in an electronic scale of the present invention will be explained based on a specific embodiment shown in FIGS. 1 and 2. Components having the same functions as those in FIG. 3 are given the same reference numerals and their explanations will be omitted.

FIG. 1 shows an electronic scale that implements the tare erasing method of the present invention, in which a gross weight value and a net weight value are input to a processing section 5, and only a one-touch tare button 8 is provided as an indicator switch. ing.

FIG. 2 shows a flowchart of the main parts of the processing section 5'. The processing unit 5' checks [b-1] whether the one-touch tare button 8 has been operated, and then selects [b-1].
1], when the operation is detected, the net weight value N output from the subtraction unit 3 is compared with the reference weight "1e" [b-2],
If "weight value≧1e" is detected in [b-2], the contents of the tare memory 6 are updated to the total weight value at that time [b-3], and the routine shown in FIG. 2 is exited. Also, if "weight value <1e" is detected in [b-2], the contents of the tare memory 6 are updated to the numerical value previously entered in the numeric keypad register 7 using the numeric keypad 10 [b-4] to exit the routine shown in Figure 2. In this way, the contents of the tare memory 6 are updated with [b-3] or [b-4], and the contents of the tare memory 6 are given as the tare amount from the processing section 5' to the subtraction section 3.

With this configuration, even if the container 11 containing the raw material 12 is loaded onto the load cell 1 and the total weight is 1e or more as shown in FIG. The net weight of only the raw material 12 can be displayed on the display section 4 by subtracting the weight of the container 11 set on the numeric keypad register 7 by operation.

In other words, if you operate the one-touch tare button 8 in the state shown in Fig. 5, the routine shown in Fig. 2 will result in
Through [b-1] → [b-2] → [b-3], the contents of the tare memory 6 are updated to the total weight of the container 11 and the raw material 12, and the net weight = “zero” on the display unit 4.
is displayed. When the one-touch tare button 8 is operated again, the tare has been erased in the first insertion and the net weight has become zero, so it is determined that "net weight value <1e" in [b-2]. 4] is executed. In [b-4], the contents of the tare memory 6 are updated to the known weight of the container 11 set in the numeric keypad register 7, and the known weight value of the container 11 is output to the subtractor 3 as the stored tare amount, so the display Section 4 displays the net weight of only the raw material 12.

Note that since the stored tare amount is zero at the start of tare subtraction, one operation of the one-touch tare subtraction button 8 completes the routine [b-1]→[b-2]→
[b-3] is [a-1] → [a-2] → in Figure 4
It is equivalent to [a-3].

Effects of the Invention As explained above, in the tare erasing method for an electronic scale of the present invention, when the operation of the tare instruction switch is detected, the stored tare amount is set according to the magnitude of the net weight after tare erasing. In order to execute tare by updating to the total weight or numerically set weight, "weighing tare" and "setting value tare" are executed in all weighing conditions even though a single tare instruction switch is used. '', and the number of tare instruction switches can be reduced by one compared to the conventional tare erasing method without impairing functionality.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of an electronic scale that implements the tare erasing method of the present invention, Fig. 2 is a flowchart of the main part of Fig. 1, and Figs. 3 and 4 are conventional electronic scales. A configuration diagram of the scale, a flowchart of its main parts, and FIG. 5 are explanatory diagrams of the usage state of the electronic scale. 1...Load cell, 2...A/D converter, 3...
...Subtraction section, 5'...Processing section, 6...Tare memory,
7...Numeric keypad register, 8...One touch tare button, G...Gross weight value, N...Net weight value.

Claims (1)

[Claims] 1 When the operation of the tare instruction switch is detected, it is determined whether the net weight after erasing the tare is greater than or equal to the reference value, and if the net weight is greater than the reference value, the stored tare amount is set to the total weight at that time before erasing the tare. A method for erasing a tare in an electronic scale, in which the net weight is updated to a numerically set weight and the tare is subtracted, and when the net weight does not exceed a reference value, the stored tare amount is updated to a numerically set weight and the tare is subtracted.