JPH06100490B2 - Automatic taring device for electronic scales - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic taring device for an electronic scale that weighs a product together with its tare and determines the tare weight based on the measured value to calculate the net weight of the product. .

(Prior Art) In order to calculate the net weight of a product by subtracting the tare weight from the total weight of the tared product, it is necessary to set the tare weight in the electronic scale in advance. For example, Japanese Patent Publication Sho 59
In the electronic scale described in -47248, only a specific tare weight corresponding to the product to be weighed is set in the electronic scale before weighing the product.

This setting method is as follows: (1) When the tare of the product to be weighed is different from the tare of the product weighed previously, a new tare is weighed and the weight is preset and stored in the electronic scale. (2) When the tare of the product to be weighed is different from the tare of the product weighed previously, the weight of the new tare is set by the numeric keypad and the weight is set and stored in the electronic scale. There is a method.

In all of these conventional electronic scales, the size of the product to be weighed is different, and therefore, whenever the weight of the tare changes, it is necessary to operate the electronic scale and reset the tare weight each time.

(Problems to be Solved by the Invention) In the setting method of (2), if the ten key "6" is mistakenly pressed even if the tare weight is 8 g, the setting will be 6 g. . In this way, if the operator makes a mistake in operation, accurate weighing cannot be performed, and an incorrect net weight is displayed. Especially when there are many customers and when there are many products with different tare weights, this kind of operation error is likely to occur. Thus, in the conventional technology, every time the tare changes,
Since it is necessary to set the tare weight on the electronic scale, there is a problem in that the net weight may not be accurately measured and displayed.

Therefore, an object of the present invention is to solve the problems of the prior art, and to automatically adjust the tare weight of the electronic scale without having to reset the tare weight to the electronic scale each time the tare weight changes. It is intended to provide a device.

(Means for Solving Problems) The present invention includes a weight detection unit for measuring the product weight of a tare weight, and a tare weight registration unit for registering a plurality of tare weights corresponding to the product weight. An automatic tare of an electronic scale, comprising tare subtracting means for reading the tare weight corresponding to the product weight in the weight detection unit from the tare weight registration unit and subtracting the tare weight from the product weight to calculate the net product weight. The pulling device solves the problems of the prior art as described above.

(Operation) In the present invention, the weights of a plurality of tares corresponding to the total weight of the tared product are registered in the correspondence table in advance, and the tare weight corresponding to the measured total weight is automatically read out. By subtracting the tare weight from the total weight, it is possible to save labor and simplify the weighing work.

(Example) Hereinafter, the Example of this invention is described in detail according to drawing.

FIG. 1 is a block diagram of the electronic scale of the present invention. The weight detection unit 10 measures and detects the total weight of the product in the tare when the product is placed together with the tare on a weighing pan (not shown). The total weight detected by the weight detection unit 10 is input to the A / D converter 12, converted into a digital value, and output to the input port 22 of the arithmetic control unit 20. The key input section 14 includes a numeric keypad section 16 and a function key section.
18 is provided, and the key data from the key input unit 14 is output to the input port 22.

The arithmetic control unit 20 basically includes a CPU 24, a RAM 26, a ROM 28, an input port 22, and an output port 30. RAM26
Is backed up by battery 27, so
The contents of RAM26 are not erased when the power switch of the device is off. A program for controlling the CPU 24 is written in the ROM 28, and the CPU 24 reads external data required from the input port 22 according to this program, or exchanges data with the RAM 26 to perform arithmetic processing. ,
The processed data is output to the output port 30. Display
32 includes a price indicator 34, a weight indicator 36, a unit price indicator 38, a tare weight indicator 40, a tare weight indicator 42, etc., and an output port.
The processed data from 30 is supplied and driven.

Incidentally, the tare weight cancellation lamp 42 is for notifying the operator whether or not the electronic scale is set to the automatic tare weight cancellation mode, and is switched from the conventional setting method by the ten-key operation,
The mode may be selected and the automatic tare weight cancellation device may be driven.

2 and 4 show a flow when operating the automatic tare weight cancellation device of the electronic scale of the present invention according to the program written in the ROM 28.

The flowchart of FIG. 2 shows the flow when registering the tare weight, whereby the tare weight is registered in the correspondence table of FIG. In the correspondence table shown here, the range of the total weight of the tared product is indicated by the boundary value, and the boundary value 150 means the weight range of 0 to 150 g,
The tare weight at this time is 8 g, and the boundary value 250 is the weight range 1
It means 51 to 250 g, and the tare weight at this time is set to 10 g. In addition, this kind of correspondence table is RO
It may be registered and stored in the M28 in advance, and if the user only needs to select the ROM 28, this type of program in the RAM 26 is unnecessary. If the product weight is close to the boundary value, if the tare weight can be selected in two ways, the operator may select the tare weight that does not correspond to the requested weight and weigh it. It is preferable because it can be dealt with even when placed.

When the power switch is turned on while pressing the numeric key “5”, the CPU 24 stores the predetermined program in the RO.
The address of M28 is fetched and the flow of FIG. 2 is executed.

The operation flow of tare weight registration in FIG. 2 will be described in detail below. Corresponding table addressing register R in RAM26
Is set to the start address value m ₀ of the correspondence table (step 1). The boundary value of the weight range is entered using the numeric keypad of the key input unit 14 (step 2). The registration key of the key input unit 14 is turned on (step 3). When the registration key is pressed, the CPU 24 registers the boundary value entered by the numeric keypad in the boundary value column of the correspondence table designated by the address m in the register R (step 4). Enter the tare weight from the numeric keypad (step 5). When the registration of the tare weight is completed, the completion key of the key input unit 14 is turned on, and when the registration is continued, the registration key is turned on (step 6). CPU2 receives the ON signal of registration key or completion key
4 registers the tare weight data from the numeric keypad in the tare weight column of the registration table designated by the address m of the register R (step 7).

It is determined whether the function key pressed in step 6 is a completion key or a registration key (step 8). Next, the address value stored in the address specification register R is set to m +
The value is updated to 1 (step 9), and the process returns to step 2 again. Such a flow is repeated until the completion key is pressed, and the correspondence table is created.

The flowchart shown in FIG. 4 shows the weighing operation procedure. That is, when the CPU 24, for example, turns on only the power switch, fetches a predetermined address of the ROM 28 and executes a predetermined program stored therein, and the total weight of the tared product is stored in the RAM 26 or the ROM 28. Sequentially comparing with the boundary value of the correspondence table of, the tare weight of the corresponding range is read from the correspondence table, the net weight is calculated,
Displayed on the display unit 32.

The details will be described below with reference to FIG. Set the unit price of the product to be weighed and display it on the unit price display 38 (Step 2
0). Place the tared product on the weighing pan (Step 2
1). The total weight measured is displayed on the weight display 36 (step 22). It is determined whether or not the measured value is stable (step 23). If the measured value is not stable, step 22
And steps 22 to 23 are repeated until the measured value is stable.

Note that this step 23 is a step necessary for subtracting the tare weight after the measured value stabilizes, but the measured value is A /
When the tare weight is read out and the net weight is calculated each time it is input from the D converter 12, this step 23 is unnecessary.

Steps 24 to 30 are routines for automatically reading the tare weight from the correspondence table. First, it is determined whether or not the measured value is smaller than 150 g (step 24).
When the weight is 150g or less, the corresponding tare weight is found from the corresponding table.
Read 8g (step 25). If it is over 151g, then
It is determined whether the weight is in the range of 151 g to 250 g (step 26). When the measured value is 250 g or less, the corresponding tare weight 10 g is read from the correspondence table (step 27). When the measured value is 251g or more, it is judged whether it is in the next weight range. Thus, when the measured value is 1051 g or more, the process proceeds to step 28, and the measured value is 1051 to 1550.
It is judged whether or not it is within the range of g (step 28). When the measured value is 1550 g or less, the corresponding tare weight 26 g is read from the correspondence table (step 29). When the measured value is 1551 g or more, the corresponding tare weight 30 g is read from the correspondence table (step 30).

Thus, after the reading of step 25, 27, ... 29 or 30, the read tare weight is displayed on the tare weight display 40,
The tare weight subtraction lamp 42 is turned on (step 31). The tare weight is subtracted from the measured value to calculate the net weight.
To display it (step 32). The price is calculated from the net weight and the unit price and displayed on the price display 34 (step 3
3).

Steps 34 to 36 are steps for an operator of the electronic scale, for example, a clerk at a butcher shop, to perform a weighing operation on a product placed on a weighing pan, such as meat, and sell it to a customer. That is, it is judged whether the net weight of meat matches the quantity ordered by the customer (step 34), and if they are different, the net weights are adjusted to match (step 36), and the net weight is readjusted. Steps 22 to 33 for calculating are repeated, and when the net weights of the meat are the same, the meat is grated together with the tare from the weighing pan, packaged and handed to the customer (step 35).

(Effects of the Invention) As described above, according to the present invention, even if the tare weight changes each time, the corresponding tare weight is automatically read and the net weight of the product is calculated, so that the operation is simplified. Thus, it is possible to provide labor saving, and at the same time, it is possible to provide an automatic tare weight cancellation device for an electronic scale, which can surely prevent a product from being sold with an incorrect weighing due to an operation error.

[Brief description of drawings]

FIG. 1 is a block diagram of an electronic scale showing an embodiment of the present invention, FIG. 2 is a flow chart showing a program for registering a tare weight, and FIG. 3 is created in a RAM or ROM. FIG. 4 is a diagram showing an example of the correspondence table, and FIG. 4 is a flowchart showing a program for calculating the net weight. 10 …… Weight detection section, 12 …… A / D converter, 14 …… Key input section, 20 …… Computation control section, 32 …… Display section.

Claims (2)

[Claims] 1. A weight detection unit for weighing the product weight of a tare dust, a tare weight registration unit for registering a plurality of tare weights corresponding to the product weight, and a product weight for the weight detection unit. An automatic tare subtracting device for an electronic scale, comprising: a tare subtracting means for reading the tare weight corresponding to the item from the tare weight registration unit and subtracting the tare weight from the product weight to calculate the net product weight. 2. A tare weight registering unit for registering a plurality of tare weights in association with the tare weight product weight in the tare weight registration section, and rewriting the registered contents. An automatic taring device for an electronic scale according to claim (1).