Shop scales with digital display

PATENT DESCRIPTION

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Additional Phtent to the patent .........—

Reported: 23.10.75 - (P. 184209)

Int.CI¹. G01G 19/413 G01G 23/37

OFFICE

PATENTOWT

Platen: 24.10.74 for claim 1 (2.6)

22.09.75 for claims 2.3 (5,10,11)

Finland

The notification was announced: 28.08.76

CZECH ELŃIA

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Opel patent published: 30.04.1979

The inventor

Patent holder: T: mi Vaaka-Nyholm, Helsinki (Finland)

Weight, especially store scale

The subject of the invention is a scale, especially a shop scale, indicating weight (KG), unit price (PLN / KG) and value of weighed goods (PLN).

Previously known store scales of this type have the disadvantage that it is extremely troublesome to simultaneously observe on them all three of the abovementioned sizes. Especially buyers who do not know such scales well have great difficulty checking the final price according to the weight. Thus, it follows that the previously known store scales of this type are not convenient for the buyer, because he has practically no way to check the final price himself and he must believe the price given by the seller or is forced to carry out difficult calculations in which he multiplies weight or number by unit price, which he may know. ·

The object of the present invention is to eliminate the abovementioned disadvantage and to create a weight that would make it easy for the buyer to read all these three quantities.

The essence of the present invention is that the balance, with indication of weight, unit price and final price, including an electric measuring transducer connected to a weighing pan, weight input system, time dosing device, analog-to-digital converter, weight comparison comparator, manual price keyboard unit, calculator and indicator device, has in its system a selector, which is connected to the truck data entry system and manual unit price keyboard, where the truck data entry system and manual unit price keyboard have a common input to the calculator, and the weight change comparison unit is connected to the selector while the indicator device has a fixed number of single digits of the indicator device , the amount is limited in such a way that the unit price and the total price have the same single digits of the indicator device. '

The subject of the invention is illustrated in the exemplary embodiment of the drawing, in which the figure shows the weight according to the invention in perspective view from the rear, Fig. 1b - the same weight also in perspective view but in front view, Fig. 2 - block diagram of the first embodiment of the balance according to the invention, and Figure 3 is a block diagram of a second embodiment of the balance according to the invention. &lt;

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In the block diagram shown in Fig. 2, the "weighing room 1" is functionally linked to an electric measuring transducer having, for example, a bridge resistance circuit, where the weight changes cause a change in resistance in one or more branches of the circuit. The analog signal from the measuring transducer is transformed in the analog-to-digital converter 2 into a digital form and then it is forwarded to the automatic data input system 3. · This automatic delivery system 3 comprises the following phases: (1) tweaking of previously entered data, (2) introduces the first significant digit, which, for example, for weights with a range of less than 10 kg, is the digit denoting kilograms, (3) introduces the decimal point between kilograms and games, (4) introduces the second digit , third and fourth indicating grams and (5) determining the type of action performed by the calculator 7 to prepare the latter for multiplication.

The automatically entered truck data goes through the selector 6 to the calculator 7 for multiplication. Calculator 7 is a ready-made device used as a component of the balance, having only one field in which it can show successively the multiplier, multiplier and product, which in this case are weight (KG), unit price (PLN / KG) and final price (PLN) . '

The calculator 7 only transmits one of these quantities at a time to the display device 10 via the control element 8, depending on which function is assigned to the calculator 7. Since the basic task of the whole device is weighing, the display device 10 normally shows the weight. The indicator device 10 always shows the weight when the weight changes or when another function has not been assigned to the calculator 7 via the keyboard 8, regardless of whether the weight is variable or constant. The comparator team of 4 Clementian changes keeps track of these changes. The time dosing device 11 assigns the same basic time interval for the analog-to-digital converter (measurement period), weight change comparison (comparison period) and conditionally, through the selector 5, an automatic data entry system (input period).

If the weight changes, then two different values ​​are obtained in the next two truck input periods! weight then, the comparator 4 of weight changes keeps the selector 5 in a state of transferring the weight signal to the calculator 7 At the same time locking the keyboard 6. If, however, in the two successive input periods the weight is measured the same, then the comparator 4 overrides the selector 5 to the state in which it releases on keypad lock 6. Now you can press the appropriate keys to enter the unit price, which will be a multiplier in the calculator 7. Pressing the first key with the number automatically determines the place of the decimal point in the calculator 7 so that two digits remain on the right side of the decimal point. ¹

The place of the decimal point is governed by the logic system 9 of the unit price in such a way that it first blocks the selector 5 in a state where the weight data cannot be transferred to the calculator and the weight value entered before pressing the digit key remains in the calculator as a multiplier. Secondly, the logic system of unit price 9, controlled by the place of the decimal point, governs the indication of the unit price (PLN / KG) by the indicator. Thus, pressing the first key with a number will replace the "KG" symbol by the "PLN / KG" symbol by adding the "PLN" symbol to the previous one. The unit price digits are shown on indicator 10 on a principle known from the operation of ordinary pocket calculators, moving from right to left as the next number keys on the keyboard 6 are pressed. After making sure of the indications on the indicator 10 that the unit price has been given correctly, the final price is obtained by pressing the key 6.1. ¹

As already described, the calculator 7 has already received the multiplication order in the last phase of automatic data entry, and therefore, after entering the multiplier using the keyboard 6, the calculator 7 now only needs the impulse corresponding to the type of action to show on the indicator 10 the multiplication result that has already been carried out in it, i.e. product being the final price. In addition to providing the impulse corresponding to the type of operation for the calculator 7, pressing the button 6.1 also controls the logical unit 9 of the unit price, causing the unit to delete the symbol "kg and thus leaving only the symbol" PLN. In addition, pressing the 6.1 key sets logic unit 9 to lock the selector for a specified duration of the delay (e.g. 3 seconds) so that the truck data cannot be transferred via the calculator 7 during this time. After this delay, the selector lock 6 is released and new truck data can be transferred to the calculator and thus to the indicator 10 so that the device works again only as a weight. Even after this delay, the final price remains on the indicator as long as the weight does not change, i.e. as long as the item is on the weighing pan. However, even a small change in weight, scarred from the sensitivity selected for a given weight, is only a few

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ι '• I grams causes the weight comparison unit 4 to overdrive the selector 5 to the state where the keyboard is locked and the truck data is transferred to calculator 7 and hence to indicator 10. Calculator 7 by changing the place of the decimal point (three digits on the right comma) controls the logical unit 9 of the unit price, which causes the symbol "KG to appear on indicator 10.

To exclude the possibility of performing false calculations in the event of entering incorrect data, a 6.2 key is provided on the keyboard 6, which when pressed causes the selector 5 to return to the state it was in before entering the data manually using this keyboard, which allows the transfer of weight data to the calculator 7 and further to indicator 10, so that the balance is immediately ready to manually enter the unit price again, In fact, the 6.2 key can be used in any situation to cause the balance to return to the weight indication state, which is the state of the basic balance function and the initial state for the other functions performed by it. Next, the embodiment shown in Fig. 3 will be described, where the same reference numbers are used to designate identical identical blocks in the diagram. The most important difference compared to the example shown in Fig. 2 lies in the operation of the selector 5.¹

So that the person using the scale can enter the unit price manually without having to wait for the weight data to settle down, the selector 5 does not block the keyboard 6 here, while the unit price can be manually entered into the original memory of the calculator 7 at any time. Pressing the first key on the keyboard 6 erases the current state of the calculator 7 using the erasing unit 12 and overdrive the selector 6 stand up, at which the flow of truck data from the automatic data entry system 3 to the calculator 7 is blocked and results in entering into the original memory of the calculator 7 the first digit of the unit price which at the same time is transferred to the indicator 10 and the unit price logic circuit in the same way as it was supposed to place in the example shown in figure 2. In this state, the logic circuit of the unit price controls the erasing unit, so that the next pressing of the key with the digit on the keyboard 6 no longer causes the erasing of the calculator 7, but this digit gets into its original memory by attaching the already entered digit. In this way, the unit price can be entered into the calculator 7 and at the same time is transmitted to the indicator 10 digit by digit by moving from right to left.

The final price is obtained by pressing the button 6.1, which redirects the selector 6 to a state in which the truck data from the automatic data entry system 3 can go to the secondary memory of the calculator 7 together with the order to show the result of multiplication, provided that the weight change comparator 4 finds a constant weight during at least two consecutive entry periods. ·

In this case, the first stage of automatic input of weight data is either a multiplication order or an order to delete the secondary memory of the calculator 7. The first occurs when the secondary memory of the calculator has previously been deleted by manually entering the unit price and in other cases the first stage will be the delete order. The last stage is the order to show the result, but this only happens if the 6.1 key is pressed and the weight remains constant (does not change). If both of these conditions are not met, the calculator 7 is not ordered to show the result.

The periods of introducing new digital weight data are repeated alternately with erasing the calculator's secondary memory until the weight is constant. In other words, when the unit price has been entered manually and the 6.1 «key has been pressed, the display of the final price on the indicator 10 will take place as soon as the mass comparator 4 finds that the weight remains constant for at least two consecutive input periods. It is usually the case that the weight has time to establish itself during the period of manual introduction of the unit aeon so that in practice there is no delay in the operation of the balance.

Although in the example shown in Fig. 3, manual input of the unit price prevents the truck data from being accessed by the indicator 10, pressing the key 6.1 allows the truck data to be transferred to the calculator 7 and then to the indicator 10. So that the weight of the goods can be seen on the indicator after entering the unit price, if necessary, such a design solution was used so that all the time when the 6.1 key is pressed on the indicator the weight will be visible and only by releasing the 6.1 key allows the order 7 to be shown to the calculator the result.

Because the weight will not be shown in this case without a special call, either by waiting before entering the unit price or by holding the 6.1 button pressed long enough and in some countries regulations require that the weight be visible all the time, a separate indicator 10a may be provided only to show the weight, to which the truck data is fed directly from the analog-to-digital converter 2 and on which the weight is constantly visible. In this case, the selector 5 can be arranged so that the weight indications do not appear at all on the indicator 10.

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The 6.2 key controls the delete unit 12 so that at any time the calculator's memory can be deleted and the selector 5 moved so that the truck data reaches the calculator 7 and then to the indicator 10. The 6.2 key is also needed when a separate indicator 10a is used for weight only to enable the deletion of incorrectly entered data into the calculator 7 and re-entering the unit price without having to perform erroneous calculations.

As can be seen from the above, the balances according to the invention are automated as far as possible. It is only necessary to enter the unit price manually and after checking on the indicator 10 that the unit price has been entered correctly, pressing the key 6.1. 'to receive the final price. The functions fulfilled by each block have been described above and a person with appropriate qualifications in this field is able to perform * these individual functions in many different ways, using well-known electronic solutions. For example, the assembly with the most complex operation, i.e. calculator 7 is available as a finished component. The indicator 10 can advantageously be made using the well-known liquid crystal technique. In addition, one can indicate as an advantage the way of indicating individual quantities, which requires only one indicator control circuit 8, while in previous solutions three such circuits were needed, one for each of the indicated quantities. ·.