JPH0115391B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a printing device, and more particularly to a printing device such as an electronic typewriter equipped with an automatic correction function, superscript, subscript, etc. functions. It is.

[Conventional technology]

Conventional electronic typewriters have a function that allows printing by selectively using a superscript located at the upper side and a subscript located at the lower side, such as a fraction display, for example.
For example, as shown in Figure 1 A, B, and C, when trying to print the fraction "1/2", this printing method uses superscript to print "1" and then prints a horizontal line. In this case, the information printed as "1" is deleted from the line buffer memory that stores the print information and replaced with horizontal line information. When attempting to erase a character group using a correction key, it is not possible to erase all the characters at once, and one character at a time must be erased by manual operation or other means, and this erasing work is extremely complicated. The drawback was that it was time consuming.

List the prior art of common printers. 1.
USP3630336 (applicant: IBM) describes technology for controlling the printing position of underlines, 2. USP3780846 (applicant:
IBM) stores one line of already printed characters in memory,
Technology that allows deletion and insertion; 3.
USP 4037705 (Applicant: Extel Corp) describes a technology that recognizes the descender character with a decoder, controls the paper feed, and then returns the paper to the original state after printing. 4.USP 4244657 (Applicant: Zaner-Bloser Inc)
5.USP3380568 (applicant ITT
6.USP 4286889 (Applicant
Triumph Werke Nurnberg AG) developed technology related to positioning accuracy when moving the carriage backspace to erase already printed characters, 7.
USP3888340 (Applicant Burroughs) describes a technology that allows the paper feed pitch to be changed manually by selecting the desired diameter on the gear stack, 8.
USP3976990 (Teletype) is a display technology that displays overscripts and subscripts as dots on a display by controlling a deflection coil.In this way, various printer-related technologies have been proposed. However, the drawback is that no technology has been found to solve the above-mentioned problems.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional method, and is configured so that all printed character groups including superscripts and subscripts can be erased at once by simply operating a correction key. The purpose is to provide a printing device.

[Means for solving problems]

In order to achieve the above object, the present invention includes a first character key representing a first character, a second character key representing a second character, and an erasure instruction key (KB) for instructing erasure. , an erasing means for erasing printed characters on paper, a paper feeding means (PRT) capable of reversibly transporting paper, and printing the first character and the second character at the same printing position in the horizontal direction. If you do,
Along with paper feed information indicating the amount of paper feed to be carried while printing the first and second characters, the first
a first storage means (LB) for storing first character information corresponding to the character and second character information corresponding to the second character; and the first character information stored in the first storage means. , a second storage means (C) for sequentially extracting and storing second character information, and a second storage means (C) for storing the first and second character information when erasing is performed in response to the operation of the erasure instruction key. to the second storage means, erase the first character, feed the paper in the opposite direction to that during printing based on the paper feed information, and then erase the second character. We adopted a configuration that includes a control means (CPU) that controls the paper feeding means.

It should be noted that the alphanumeric characters written in brackets attached to the above-mentioned erasure instruction key and each means correspond to the embodiment as an example.

[Operation] According to the above configuration, the first and second character information are retrieved from the first storage means to the second storage means in response to the operation of the erasure instruction key, and the first character is erased. After that, the paper is fed in the opposite direction to the printing direction based on the paper feeding information stored in the first storage means, and then the second character is erased to write the superscript, subscript, etc. Composite printed characters can be erased with a simple operation.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 2 is a block circuit diagram illustrating an embodiment of the present invention. In the figure, the reference numeral 1 indicates a keyboard, which includes numeric keys such as "0" to "9", "-", "-", "+", a superscript key SPK, a subscript key SBK, a correction key CK, and various character keys and control keys (not shown) are provided.

CPU is a central processing unit, and PRT is a printer, which is equipped with a print head H and a motor M that moves printing paper P up and down, and prints from left to right.
The CPU is provided with a register S for storing the amount of movement of the printing paper P up and down, a flag F for determining whether to print or erase, and a register C for storing character information. The one indicated by the symbol LB stores the information of characters printed by the line buffer, and the WKM is a working memory for replacing the character information of the line buffer.

Next, the operation of this embodiment configured as above will be explained.

First, when the superscript key SPK is pressed, the motor M rotates to lower the printing paper P by 1/2 line, and the CPU stores the amount of movement in the register S. Next, when you press the character key "1", the CPU
stores character information in register C, and stores character information in register C in line buffer memory LB as shown in Figure 2A.
and stores the contents of S. Then, the printer PRT prints "1", and immediately after printing, the motor M raises the print paper P by 1/2 line and returns it to its original position, the print head H moves to the next print position, and the registers C and S cleared. Next, align the print head H to the print position of "1" and press the character key "-".
The CPU stores the character information in register C, prints the printer "-", and the CPU uses the working memory WKM.
is used to replace the line buffer as shown in FIG. 2B and clear register C. Furthermore, the third
In FIG. B, "(" and ")" indicate that a plurality of pieces of printed character information exist on the same printing position, "(" indicates the beginning of the information, and ")" indicates the end thereof.

After printing "-" in this way, once again align the print head H with the position where "1" was printed and press the subscript key SPK, the motor M
raises the 1/2 line printing paper P, and the CPU stores the amount of movement in the register S.

Next, when the character key "2" is pressed, the CPU stores character information in register C, and stores the contents of registers C and S in the line buffer as shown in FIG. 3C. And the printer PRT is the character "2"
is printed, and the motor M lowers the printing paper P by 1/2 line and moves to the next printing position. At this time, the CPU clears registers C and S. Next, a method for erasing the fraction formed by the superscript and subscript printed in this manner will be explained.

First, when the print head H is placed on the character group to be erased and the correction key CK is pressed, the CPU searches the line buffer LB for information on the print character group on the print head. For example, in the example shown in Figure 3C, the CPU first moves from the line buffer to the register C.
The character information "2" is stored in the register S, and the value of SC2 is stored in the register S, and the flag F is set. Then the printer
The motor M of the PRT rotates by the value stored in the register S to move the print paper P to the position of the print character "2", align the print head H, and then
PRT erases the printed character "2", motor M rotates in reverse by the value in register S, and registers C and S are cleared.

Next, character information "-" is stored in register C,
The printer PRT erases the character "-", then stores the character information "1" and the value of SC1 in registers S and C, and by the same operation as above, the printer PRT erases the character "2" and stores the value of SC1 in the register. C and S are cleared.

In this way, the line battle LB's "("~
When the erasure of the printed character information up to ")" is completed, the CPU clears the flag F and deletes all the fractional printed information in the line buffer LB. Therefore, the fractional print information, which is a composite character consisting of a superscript and a subscript, is completely erased, and is also completely erased from the line buffer.

According to the above configuration, not only superscripts or subscripts but also composite printed characters such as underlined characters made of underline characters and normal characters can be erased.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a first character key representing a first character, a second character key representing a second character, an erasure instruction key for instructing erasure, and a an erasing means for erasing the printed characters; a paper feeding means capable of reversibly conveying the paper; and when printing the first character and the second character at the same printing position in the horizontal direction, , along with paper feed information indicating the amount of paper feed to be carried while printing the second character, the first
a first storage means for storing character information of and second character information corresponding to the second character; and sequentially extracting and storing the first and second character information stored in the first storage means. and a second storage means for retrieving the first and second character information from the first storage means to the second storage means when erasing is performed in response to the operation of the erasure instruction key;
After erasing the second character, the paper is fed in a direction opposite to that during printing based on the paper feed information, and a control means is provided for controlling the paper feeding means to erase the second character. We are hiring. Therefore, a series of erasing operations for erasing composite printed characters such as superscripts and subscripts can be performed automatically and easily without relying on manual operations, making the erasing operation extremely simple and quick. There are excellent effects that can be done.

[Brief explanation of drawings]

1A to 1C are explanatory diagrams showing the handling of print information in the line buffer memory according to the conventional method, FIG. 2 is a block diagram of a control circuit showing an embodiment of the present invention, and FIGS. 3A to C are FIG. 3 is an explanatory diagram showing how print information in a line buffer is handled according to the present invention. CPU...Central processing unit, KB...Keyboard,
LB...Line buffer memory, PRT...Printer,
WKM…Working memory.

Claims (1)

[Claims] 1. A first character key representing a first character, a second character key representing a second character, an erasure instruction key for instructing erasure, and an erasure for erasing printed characters on paper. means; a paper feeding means capable of reversibly conveying paper; and when printing the first character and the second character at the same printing position in the horizontal direction, the first character and the second character
First character information corresponding to the first character and second character information corresponding to the second character are stored, along with paper feed information indicating the amount of paper to be conveyed while printing the character. a first storage means for sequentially extracting and storing the first and second character information stored in the first storage means; and a second storage means for sequentially extracting and storing the first and second character information stored in the first storage means; In this case, the first and second character information are retrieved from the first storage means to the second storage means, the first character is erased, and then the information is reversed from the time of printing based on the paper feed information. 1. A printing device comprising: a control means for controlling the erasing means and the paper feeding means so as to feed the paper in the direction and then erase the second character. 2. The printing device according to claim 1, wherein at least one of the first to second characters is a superscript or a subscript. 3. The printing device according to claim 1, wherein the second storage means stores one of the character information. 4. The printing device according to claim 1, wherein the first and second characters are fractions.