JPS5836395B2 - desk electronic calculator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a desktop electronic calculator, and more particularly to a desktop electronic calculator that is equipped with a manual switch for determining whether or not to execute a blank line feed on the recording medium, so that the printing format can be selected. be.

In Figure 1 A, 123X3=369 printing and 628
There is one blank line S between the printing of +223=851, and this blank line S serves to clearly distinguish one operation from the next.

At the mouth of Figure 1, 123X3=369 and 628+2
There is no blank space between 23=851.

Although this is inconvenient for differentiating calculations, it saves the paper necessary for printing, prevents the printing paper from becoming long and unwieldy when calculations continue, and at the same time eliminates blank line feed time, so it is useful for experienced operators. It can also follow fast key inputs.

The present invention makes it possible to select the printing format shown in FIG. 1.

FIG. 2 shows an example of the circuit of the present invention.

A is a key input section, B is a calculation section, C is a print control section, D is a print section, and E is a line feed control section.

First, the case of a single line feed (for example, the A key) will be explained with reference to the timing chart in FIG. 3A.

After one line of printing is completed, an END signal is issued from the print control section C to set the flip-flop F1.

F1 applies a recording medium feeding command PF to the printing unit D via the amplifier AP to perform a line feed.

A timing pulse (TP signal) is returned to the line feed control section E from the printing section D every time a line is changed.

This TP signal is waveform-shaped into 1 bit by flip-flop F4, inverter IN3, and AND gate G5, and is used as a set signal for flip-flop F3 and a reset signal for flip-flop F1.

Normally, the flip-flop F2 is reset, so the first TP signal passes through the AND gate G3 and resets the flip-flop F1, so the feed command PF disappears and the 1
Exit with a new line.

Next, to explain the case of a two-line feed using the timing chart shown in Figure 3, when a key operation that requires a two-line feed (for example, the ward key) is executed, the two-line feed signal f1 is output from the calculation unit B. , if the blank line feed prohibition switch S is not turned on, the output f2 of the inverter IN1 is 1, so the AND gate G1
opens and flip-flop F2 is set.

When printing is completed and the END signal is received, the flip-flop F
Set to 1 to start line feed.

The TP signal when one line is broken is the AND gate G as described above.
5 is opened, but since flip-flop F2 is set, AND gate G3 is not opened, and flip-flop F1 continues to feed the line without being reset.

In the TP signal when two lines are broken, the flip-flop F3
is set, the flip-flop F1 is reset through the AND gate G4, and the line feed ends.

As mentioned above, if the blank line break prohibition switch S is not turned on, that is, if it remains turned off, a two-line line feed is performed as shown in Figure 1A, but if this switch S is turned on, two lines are inserted. The line feed signal f1 is the output f of the inverter IN1.
2, the flip-flop F2 cannot be set and therefore the AND gate G is disabled at the first TP.
3 is opened, the flip-flop F1 is reset, and a line feed of one line is not performed, so a blank line feed is omitted and printing as shown in the opening of FIG. 1 is performed.

[Brief explanation of drawings]

FIG. 1 is an example of printing on a recording medium, FIG. 2 is a block diagram of the present invention, and FIG. 3 is a timing chart explaining its operation. A: Key input section, B: Calculation section, C
...Printing control section, D...Printing section, E.
...Line feed control section, S...Blank line feed prohibition switch.

Claims (1)

[Claims] 1. In desktop electronic calculators, etc. that provide a blank line break between one calculation and the next on a recording medium, a switch to manually select whether or not to allow a blank line feed on the recording medium and a recording medium feeding command to the printing unit. and a flip-flop that is set to output a blank line feed, if the switch selects blank line feed enabled, the flip flop is reset after a blank line feed on the recording medium, and if the switch selects blank line feed not allowed, recording is performed. A recording medium control system for a desktop electronic calculator, etc., characterized in that the flip-flop is reset every time a line breaks on the medium.