JPS6236099Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a scale that calculates the weight of an object by multiplying a weighing signal proportional to the weight of the object by a proportionality constant of the weighing signal for the weight of the object. The present invention relates to a device for verifying this multiplication.

Conventional scales, such as fee scales, are equipped with a weighing signal register that stores a weighing signal proportional to the weight of an object to be weighed, and a proportionality constant register that stores a proportional constant of the weighing signal to the weight of the object to be weighed. The weight of the object to be weighed was calculated by multiplying the values stored in both registers using a multiplier. However, in this multiplier, errors in multiplication may occur due to external noise or defects in the semiconductors constituting the multiplier. If this error is not discovered, the incorrect weight value will be believed to be correct and used in commercial transactions, etc.
It was extremely inconvenient. Utility Model Publication No. 48-108530 states that in order to notify when the power is restored that the stored value of the register of the rate scale has been destroyed due to a temporary power outage, A system has been disclosed in which a means for detecting the occurrence of a malfunction is provided, and the detecting means activates a notification output means, but this method cannot detect a calculation error caused by a failure of the multiplier.

The object of this invention is to provide a device for checking whether multiplication in a multiplier is correct.

Hereinafter, this invention will be explained based on an example in which this invention is implemented in a fee scale shown in the figure. In the figure, the part surrounded by the dashed line is the verification device, and the other parts are the fee scales.

For convenience of explanation, the configuration of the fee scale will be explained first. 1 is a unit price register, and by operating push button 2, the price (unit price) per unit weight of the object to be weighed is displayed.
is memorized. Reference numeral 3 denotes a weighing signal register in which a weighing signal proportional to the weight of the object to be weighed, which is measured by a calculation mechanism (not shown) and converted into a digital quantity by the analog-to-digital converter 4, is stored. A proportional constant register 5 stores a proportional constant of the weighing signal to the weight of the object to be weighed. A multiplier 6 multiplies the value stored in the weighing signal register 3 by the value stored in the proportional constant register 5, and the multiplication result (weight of the object to be weighed) is stored in the weight register 7. A multiplier 8 multiplies the value stored in the weight register 7 and the value stored in the unit price register 1 to calculate the price. 9, when the calculated price has a value less than the minimum currency unit, rounds it up or down, rounds the price to the minimum currency unit, and stores the value less than this minimum currency unit. 10 is a price register that stores the rounded price. Unit price register 1, weight register 7, price register 10
Each stored value is supplied to the decoder driver 11 in a time-sharing manner and displayed on the display device 12.

Next, the verification device will be explained. The stored values of the price register 10 and the weight register 7 calculated and stored as described above are stored in the decoder driver 1.
At the same time, they are stored in the verification price register 15 and the verification weight register 16, respectively. The stored value stored in the verification price register 15 is corrected by the device 17 to a value less than or equal to the minimum currency unit rounded by the device 9. This corrected value is supplied to the divider 18 and divided by the value stored in the weight register 16 for verification, and the division result is stored in the unit price register 19 for verification. The value stored in the unit price register 19 for verification is compared with the value stored in the unit price register 1 by a comparator 20. If the compared values are not equal, comparator 20 provides a signal to OR circuit 21 .

The value stored in the weight register 16 for verification is also supplied to the divider 22 and divided by the value stored in the proportional constant register 5, and the result of this division is stored in the weighing signal register 23 for verification. This stored value is compared with the stored value of the weighing signal register 3 by the comparator 24. When the compared values are not equal, the comparator 24 supplies a signal to the OR circuit 21.

25 is an analog-to-digital conversion error detector;
A signal is supplied to the OR circuit 21 when a conversion error occurs when converting a measurement signal from an analog quantity to a digital quantity.

When the OR circuit 21 receives a signal from either the comparators 20, 24 or the conversion error detector 25, it issues an output signal and erases the digital display on the scale or indicates that the transaction has been canceled. It is.

A calculation device check weight register 27 is connected to the check weight register 16 via a switch 26 . The inspection weight register 27 stores a predetermined weight value, and the stored value is stored in the verification weight register 16 only while the switch 26 is closed. At this time, weight register 7
It is assumed that a value different from the value stored in the inspection weight register 27 is recorded in . In this state, if signals are generated from the comparators 20 and 24, the divider 18 and
It can be seen that 22 is operating normally.

Also, as shown by the dotted line in the figure, the check price register 29 is connected to the check price register 15 via the switch 28, the switch 26 is opened, the switch 28 is closed, and the check price register 15 is connected to the check price register 15. If a value different from the value stored in the price register 10 is stored, only the divider 18 can be checked.

In the verification device configured in this way, the weight value is divided by a proportionality constant, and the divided value is compared to see if it is equal to the weighing signal. Therefore, if the weight calculation is incorrect due to a malfunction in the multiplier 6, this can be discovered, preventing erroneous commercial transactions, etc., and improving reliability.

In the embodiments described above, this verification device was implemented in a toll scale, but it may be implemented in other scales that calculate weight by multiplying a proportionality constant and a weighing signal. In addition, although the configuration is such that the value stored in the weight register 16 for verification is divided by the value stored in the proportional constant register 5, instead of this configuration, the value stored in the weight register 16 for verification is divided by the value stored in the weighing signal register 3. divide,
The configuration may be such that the value is compared with the value stored in the proportionality constant register 5.

[Brief explanation of the drawing]

The figure is a diagram showing the configuration of a fare scale that implements the arithmetic calculation device according to this invention. 3...Weighing signal register, 5...Proportionality constant register, 6...Multiplier, 7...Weight register, 16
...Weight register for verification, 22 ...Divider, 24
...Comparator.

Claims (1)

[Scope of utility model registration request] A weighing signal register that stores a weighing signal proportional to the weight of the object to be weighed; a proportionality constant register that stores a proportionality constant of the weighing signal to the weight of the object to be weighed; and a value stored in the weighing signal register and the proportionality constant. In a scale that includes a multiplier that multiplies the value stored in the register, and a weight register that stores the multiplication result; a weight register for verification that stores the value stored in the weight register; and a weight register that stores the stored value in the weight register; and a divider that divides one of the stored value of and the proportional constant register, and compares the result of this division with the stored value of the weighing signal register and the other of the proportional constant register, and compares the values of both values. A weighing device for calculating the weight of a scale, consisting of a comparator that emits a signal when the values are different.