JPS6131883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to obtain easy-to-read printing results by operating keys according to formulas.

Previously, numbers and marks were printed on the same line by pressing the command key after entering numbers. However, if 3-2=1 is calculated by operating the keys according to the formula, if 3- is printed on the same line, it will look like minus 3, making it difficult to distinguish it from the conventional adder system. It is also different from the writing style that is normally learned in compulsory education.

The present invention has been made in view of the above points, and will be explained below with reference to the drawings.

FIG. 1 shows an example of the print format when the 3-2= key is operated. In A, minus symbols are printed in all digits to make it easier to read, and in B, an = mark is printed and the calculation result is printed on the same line.

FIG. 2 is a block diagram of the present invention.

In the figure, INP is an input unit consisting of a decoder that detects the press of a number key, decimal point key, etc. and converts it into a binary code, a flip-flop block, etc., M is an input number storage register, I1, I2, I3, I
4, I5 are arithmetic key signal generators that detect presses of the +, -, ×, ÷, and = keys and generate constant pulses, F
1, F2, F3, F4, and F5 are the first delay circuit group that delays each input signal for a time sufficient for the M content to be printed, and F6, F7, F8, F9, and F10 are longer than the time required for the printer to perform a line feed. , a second delay circuit group that delays each input signal, OR1 is I1 to I5
An OR gate that outputs a 1 signal if any of the outputs has an output, _G1 is an AND gate that guides the M content to the number printing circuit when the CR1 output is 1, and OR2 is an AND gate that outputs a 1 signal if any of the F1 to F5 outputs is 1. This is an OR gate for giving a line feed command to the printer when .

Further, the CPU, which is not shown in the figure, receives the I5 output and leads the calculation result to the numeric printing circuit.

As is clear from Figures 2, 3, and 4A, by inputting the calculation key □- following the input of the number 3 to M, I
By the operation of 2, OR1, and G1, the number 3 in M is printed, and then a line feed is performed by F2, OR2, and after one line feed, a negative operation mark print signal F7 is given to the printer drive circuit, and one symbol is printed at the left end. Print.

Thereafter, the number 2 is input to M, and when the □= key is pressed, the number 2 is printed on the same line as the - symbol, and the = symbol and result 1 are printed on the next line.

As explained above, this system can be easily realized by adding a circuit as shown in FIG. 2 to the conventional display arithmetic circuit and print drive circuit. Figure 4B
is a conventional printing method, and it is clear that the method of the present invention is easier to see. Also, printing as shown in Figure 1A can be done by detecting the I5 output with the CPU, typing minus signs in all digits, then starting a new line and printing the result.
Also, printing the operator mark on the left side can be done by changing the position of the mark type on the type drum.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a printing example of the present invention, Fig. 2 is a block diagram thereof, Fig. 3 is a timing diagram thereof, and Fig. 4 is a diagram showing a printing example of the present invention.
Figure A is a diagram showing the printing order of the present invention, and Figure B is a diagram showing the conventional printing order. M...Register, G1...And gate, OR
1, OR2...OR gate, F1-F10...delay circuit.

Claims (1)

[Claims] 1 A print-type desktop calculator that detects the input of one of the four arithmetic keys following the number key input, prints the input number on the right side of the paper, then breaks a line and prints one of the four arithmetic marks on the left side. printing method.