JPS5829447B2 - price scale - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a price scale that measures the weight of a product, multiplies this weight by a preset unit price, and displays the sales amount of the product. It was developed for the purpose of improving the calculation method of fare scales to prevent incorrect amount calculations.

In conventional toll scales, the unit price of an item is set in advance, then the item is placed on the weighing pan, and each time the toll scale's weighing machine changes the minimum scale, it sends out a pulse corresponding to the set unit price. At the very least, charges were calculated and displayed by counting these pulse groups.

For example, if the unit price of an item is 500 yen per 100 grams,
Assuming that the weight of the item is 1,500 grams, and the unit price of the price scale is set at 500 yen/100 grams, and the item is placed on the weighing pan, the price scale will emit one pulse for every 1 gram change in the weighing pan. When this one pulse is applied to the unit price setting section, a group of 500 pulses are transmitted from the unit price setting section, and these pulse groups are counted by a counter.

Thus, when the weighing pan changes by 1500 grams, the number of pulse groups sent from the unit price setting section is 500 x 1500.
This means that 750,000 pulses were transmitted, and the decimal point is in the second last digit, so the toll scale shows 75.
The amount was to be displayed as 00 yen.

However, with the above price scale, the calculation of unit price x weight - amount is only performed once when weighing the item.
Since the amount of the item is displayed, if the calculation is erroneous due to noise or the like, the amount will be displayed incorrectly, which has the disadvantage of causing various problems in the transaction of the item.

The present invention is intended to correct the above-mentioned problem, and is aimed at
The weight-money calculation is repeated every certain cycle and the result is displayed, so that even if the calculation is incorrect due to noise etc., the correct calculation will be performed and displayed in the next cycle. be.

First, the embodiment will be explained based on the attached drawings. Reference numeral 1 indicates a light source constituting the fare scale, 2 indicates a pair of photoelectric elements provided opposite to this light source, and 3 indicates a movement between the photoelectric element and the light source 1. A freely installed code board that moves in proportion to the weight of the item placed on the fare scale.
A pulse is generated in a pair of photoelectric elements 2 by a group of slits provided in this code plate.

Reference numeral 4 denotes an amplifier and a discrimination circuit which are provided after the pair of photoelectric elements 2, and this amplifier/discrimination circuit converts the up pulse UP corresponding to an increase in weight and the down pulse DP corresponding to a weight decrease into antilogs of the latter stage. Output to control circuit 5.

Reference numeral 6 denotes a reversible counter provided after the antilog control circuit, and feeds back to the antilog control circuit 5 a weight zero signal WO indicating that the weight value of this reversible counter is zero.

When the weight value in the reversible counter 6 is zero, the anti-number control circuit 5 detects a positive weight when an up pulse UP comes in, and detects a negative weight when a down pulse DP comes in. At the same time, when the up pulse UP comes in when a positive weight is detected, the up pulse upO is output from the antilog control circuit 5, and the down pulse dpO is output from the antilog control circuit 5 when the town pulse dp comes in, and Up pulse up when negative weight is detected
When a person comes, a down pulse dp is generated from the antilog side NEu path 5.
O, when the down pulse dp comes in, the antilog control circuit 5
An up pulse upO is output from each of the up pulses upO.

The reversible counter 6 receives the up pulse u from the antilog control circuit 5.
It inputs pO and down pulse dpO, calculates a weight value using the plus weight and minus weight as antilogs, and outputs a weight value signal W to the weight register 7.

Note that G1 is a gate that opens and closes the weight register 7.

Reference numeral 8 denotes a display register, which has addresses D1 to D15 as shown in FIG. 3, and stores the weight value signal from the weight register 7 through the gate G2 in the addresses D1 to D5.

In the case of FIG. 3, the weight value of the article (not shown) is 9345 grams.

9 is a key switch for setting the unit price of the item; for example,
If the price is 1234 yen per kilogram, 1.2.3
．． Press the numbers on key switch 9 in the order of 4.

10 is an encoder, and this encoder is key switch 9
Converts the numerical signal from to a BCD signal.

11 is a subtraction circuit provided after the encoder 19;
Reference numeral 2 denotes a unit price reading circuit provided at the subsequent stage of this subtraction circuit, and this circuit has a 4-bit, 1-digit shift register (hereinafter referred to as S register) 13, and the contents of this S register are zero, as shown at address S in Fig. 2. and a zero determination circuit 14 that determines whether or not.

Reference numeral 15 denotes an adder circuit provided after the unit price reading circuit 12.

Reference numeral 16 denotes an arithmetic register provided after the adder circuit 15, which has addresses T1 to T15 as shown in FIG. It is stored via the adder circuit 15 and the like.

In the illustrated case, step stO indicates that the unit price setting value for the article (not shown) is 1234 yen per kilogram.

Reference numeral 17 denotes a circuit for arranging the significant digits of the amount of money, which is provided after the arithmetic register 16 via the game controller G3.

Thus, the signal representing the above unit price setting value is the gate Gi
It is stored in display register 80 addresses D12 to D15 via n.

In the case of Figure 3, the unit price of the goods is 12 per kilogram.
This shows that it is 34 yen.

18 is a unit price digit selection circuit, and this circuit selects the digit of the unit price reading circuit 12.

Reference numeral 19 denotes an addition/subtraction command circuit, which makes the determination of the zero determination circuit 14, that is, determines whether the contents in the S register 13 are zero or not. A command signal is input to the subtraction circuit 11 to output a command signal for subtracting 1 from the contents of the S register 13, and a command signal for opening the gate G8 and inputting the weight value signal in the weight register 7 into the addition circuit 15. It also outputs a command signal to open gate G7 and input the signal in calculation register 16 into addition circuit 15.

20 is a rounding digit selection circuit, 21 is a rounding detection circuit provided after this digit selection circuit, and 22 is a carry generation circuit provided after this detection circuit.
When the address T3 of the calculation register 16 is opened, the rounding detection circuit 21 checks whether the contents of the address T3 of the arithmetic register 16 is 5 or more or 4 or less.
If this is the case, a signal is output from the carry generation circuit 22 to the addition circuit 15, and 1 is added to address T4 of the calculation register 160.

23 is a shift counter. When the S register 13 becomes zero, the gate G9 is opened and the contents of the arithmetic register 16 are circulated through the subtraction circuit, the S register 13, the addition circuit 15, and the arithmetic register 16. register 130
When the contents of address S and the contents of addresses T1 to T15 of the calculation register are shifted one digit to the left as shown in Fig. 2, a count of 1 is counted, and when this count becomes 4 or more, a signal dg is activated to open gate G8. Output.

24 is a display circuit provided after the display register 8;
25 is a display device provided after this display circuit; 26
is a display digit drive circuit that drives this display device.

27 is a timing control generation circuit that synchronizes the entire toll scale.

In the present invention as described above, for example, the set unit price of the article is 1234 yen per kilogram, and the weight value of this article is 93.
45 grams, the unit price setting value 123% is stored in addresses TI2 to T15 of the calculation register 16 via the key switch 9, etc., and is also stored in the display register 80 address D12 via the GlG. - Stored in D15.

On the other hand, the weight value of the above item is 9345 grams at gate G2.
The data is stored in display register 80 addresses D1 to D5 through the display register 80.

Thus, if the content of the S register 13 is zero, as in step stO in FIG. The address contents are 1 on the left
At the same time as the digits are shifted, the shift counter 23 becomes count 1.

As a result, the content of the S register 13 becomes 1 as in step st1, so the addition/subtraction command circuit 19 is activated by the check of the zero discrimination circuit 14, gates G4 and G5 are opened, and the output of the S register 13 is transferred to the subtraction circuit. 11, and from the contents of this S register 13, 1 is subtracted as in step st2, and at the same time, gate G6 is opened and the weight value 9345 is inputted to calculation register 1 via addition circuit 15.
6 is stored within addresses T1 to T4.

Thus, since the contents of the S register 13 become zero as in step st3, it is checked by the zero discriminating circuit 4 in the same manner as described above, and the gate G9 is opened.
As in step st4, the contents of the calculation register 160 are shifted one digit to the left, and at the same time the shift count 23 is incremented to count 2.

As a result, the content of the S register 13 becomes 2 as in step st4, so the addition/subtraction command circuit 19 is activated by the check of the zero discrimination circuit 14, and the game) G4. G5 is opened and the output of the S register 13 is input to the subtraction circuit 11, and from the contents of this S register 13, as in step st5 (, 1 is subtracted, at the same time, the game) G5 is opened and a weight value of 9345 is added. Through the circuit 15, the arithmetic register 16
At the same time, the gate G7 is opened and the signal in the operation register 16, that is, the contents of the addresses T2 to T5 of step st4, is added to step st5, and the contents of the address of step 7'' st5 are stored. is calculation register 1
6.

Thereafter, as in steps st7 to 5t24, the contents of the S register 13 are checked by the zero discrimination circuit 14, and
Activate the addition/subtraction command circuit 19 and repeat the above process until the contents of the S register 13 become zero.
The contents of address 60 are stored as they change.

After repeating the above, when the contents of the S register 13 become zero and the contents of addresses TI2 to T15 become zero,
Unit price (1234) x weight (9345) - amount (1153)
1730) has been performed.

On the other hand, in the case of the above specific example, step st1.

st4. At st9, 5ti5, the contents of calculation register 160 are shifted one digit to the left, and at the same time,
Since the shift counter 23 is to count and the total count is 4, the signal dg is output and the gate G8 is opened, and the rounding detection circuit 21 calculates the contents of the calculation register 160 address T3. It is checked whether is 5 or more or 4 or less, and if it is 5 or more, a signal is output from the carry generation circuit 2.2 to the adder circuit 15, and l is added to address T4 as in step 5t25, and as in step 5t26. The calculation contents, in which rounding is taken into account, are stored in the calculation register 16.

Thus, the gate G3 is opened, and the contents of the arithmetic register 16 are transferred through the amount valid digit arrangement circuit 17, and the contents of the addresses T5 to TIO, which are the valid amount digits, are transferred to the addresses D6 to D6 of the display register 8.
It is moved and stored in D11.

On the other hand, since the contents of the calculation register 160 addresses TI2 to T15, that is, the contents of the unit price setting value, are zero, the gate G5 is opened and the contents of the addresses D12 to D15, which are the unit price setting value of the display register 8, are added to the adder circuit. 15, and stored in the calculation register 160 addresses TI2 to T15.

Note that the above calculation control is controlled by timing signals from the timing control generation circuit 27.

Further, the rounding digit selection circuit 20 is connected to the carry generation circuit 2.
The signal from 2 is sent to the calculation register 1 via the adder circuit 15.
In the above specific example, since the unit price is set for 1 kg, address T4 is selected.
However, when setting the unit price per 100 grams, the rounding digit is selected so as to add 1 to address T3.

Further, the unit price digit selection circuit 18 is for selecting the number of unit price digits, and in the case of the above specific example, the unit price setting digits are set at addresses TI2 to T1.
5 and 4 digits, but when the unit price setting digit is 3 digits, the number of unit price digits is selected so that the unit price setting value is stored in addresses T12 to T14.

In the present invention as described above, the unit price reading circuit 12 is provided after the subtraction circuit 11, the addition circuit 15 is provided after the unit price reading circuit, and the arithmetic register 16 is provided after the addition circuit. The output of the calculation register is fed back to the subtraction circuit 11 and the addition circuit 15, and the unit price setting value of the item in the calculation register 16 is inputted from the upper digit to the unit price reading circuit 12, and the numerical value of each digit of this unit price setting value is inputted. The weight value of the item is added to the calculation register 16 through the adding circuit a corresponding number of times, and the content of the calculation register 16 is shifted in accordance with the digit change of the unit price setting value to calculate the price of the item. Since this is a toll scale that is characterized by the fact that the calculation of unit price x weight - amount for an item can be repeated every certain cycle, even if the calculation is incorrect due to noise etc., the calculation for the next cycle will be repeated. This has great practical effects, such as being able to perform correct calculations.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an S register 13 and an operation register 16 of the same embodiment.
FIG. 3 is a chart showing the contents of the display register 80 in the same embodiment in step order. 11...-- Subtraction circuit, 12...- Unit price reading circuit, 15...- Addition circuit, 16-...
- Arithmetic register.

Claims (1)

[Claims] 1 A unit price reading circuit is provided to read the set unit price of the item via a subtraction circuit, an arithmetic register is provided after this unit price reading circuit via an adder circuit, and the output of this arithmetic register is sent to the subtracter circuit and the adder circuit. The unit price setting value of the item in the calculation register is input into the unit price reading circuit from the upper digit, and the weight value of the item is read through the adding circuit a number of times corresponding to each digit of the unit price setting value. The price is added to the calculation register, and the amount of the item is calculated by shifting the contents of the calculation register according to the digit change of the unit price setting value, and the calculation of unit price x weight - amount is repeated every certain period. Scales.