JPH0229370A - Composite character erasable typewriter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a typewriter, and more particularly to a typewriter that can automatically erase a composite character in which two characters are printed at the same printing position using a dead key. be.

[Prior Art] Conventionally, in a typewriter using a lift-off correction method in which printed characters are erased using an erasing medium such as an adhesive tape, each printing position is A memory having bits 81 to B6 for storing one printed character in a byte corresponding to , and bit B8 for identifying whether or not the printed character is an underlined character is provided, and the erase key is operated. The configuration is such that the data of one printed character corresponding to a printing position is read out and the printed character is automatically erased.

[Problem to be solved by the invention] However, in such a configuration, for example, “
When erasing a composite character such as "λ'", which is composed of two characters, "A" and "°" (umlaut), where two characters are overprinted at the same printing position, press the erase key. In one operation, only either the character "" or "A" can be automatically erased, and characters that are not erased must be erased by operating the correction key again or by another means, and the characters cannot be erased. The work became complicated and required a lot of time.

The present invention has been made to solve the above problems, and its purpose is to print at the same printing position by operating the date key and character key by pressing the erase key once. To provide a typewriter which is capable of automatically erasing a composite character consisting of two characters written at once.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a keyboard provided with a large number of character keys and an erase key, and a keyboard that prints characters on a printing paper in response to the operation of the character keys. a printing mechanism for printing, a spacing means for causing the printing mechanism to carry out a spacing operation after printing, an erasing mechanism for erasing the characters printed on the printing paper by the printing mechanism in response to the operation of the erasing key; A typewriter comprising a storage means for storing printed characters as a character code in correspondence with a printing position, and a storage means having a flag for storing the presence or absence of an underline of the printed characters, comprising: a post-print spacing means; In the case of a composite character in which two characters are printed in combination at the same printing position by providing a dead key on the keyboard that does not involve a spacing operation with the dead key and a character key, the storage means stores the data of the composite character. A first storage area that stores a character code corresponding to a first printed character in correspondence with a printing position, and a second storage area that stores a character code corresponding to a second printed character of a composite character in correspondence with a printing position. In addition, when erasing composite characters printed at the same printing position on printing paper, the first and second memory areas of the memory means are sequentially read out by one operation of the erase key. The erasing mechanism is characterized by comprising a control means for erasing the corresponding composite character according to the character code.

[Operation When a character key on the keyboard is operated, the printing mechanism prints a character corresponding to the operated character key on the printing paper, and the spacing means performs a spacing operation of the printing mechanism. Then, a character code corresponding to the printed character is stored in the storage means in correspondence with the printing position. In the case of printed characters with an underline, the presence of the underline is stored as a flag.

In addition, when printing a composite character that combines two characters at the same printing position, that is, when printing another character overlapping a date character printed at one printing position, when the dead key and character key are operated, the printing mechanism 2 at the same printing position
At the same time, the character code corresponding to the first printed character is stored in the first storage area of the storage means, and the character code corresponding to the first printed character is
Character codes corresponding to the printed characters are stored in a second storage area of the storage means in association with the respective printing positions.

When the erase key is pressed once, the character code stored in the storage means is read out, and the erase mechanism automatically erases the printed characters on the printing paper according to the character code.

Furthermore, even when the printed characters to be erased are composite characters, the erasing mechanism can be operated to erase the characters on the printing paper according to the character codes sequentially read from the first and second storage areas of the storage means at the same printing position. Automatically delete composite characters.

[Example] Hereinafter, the present invention will be explained according to examples.

FIG. 1 is a block diagram showing a typewriter equipped with a lift-off-collectidine type erasing mechanism according to the present invention. “Dead of ゛ etc.”＋
-2b1 function keys 20 and an erase key 2d for executing an automatic erase operation to be described later are arranged, respectively;
Character key 2a, dead key 2b, function key 2
By operating C, the code signal CDS corresponding to that key is output.
Furthermore, by operating the erase key 2d, an erase command signal ES is output to the print control circuit 3 as a control means of the present invention.

The print control circuit 3 outputs a print signal PS corresponding to the operated character key 2a or dead key 2b to the print mechanism 4 in response to the code signal CDS, executes the respective print operation, and also stores the data in the memory 5. A character code CC corresponding to a printed character is output, and this character code CC is stored in a storage position arranged corresponding to each printing position.

In the memory 5, a number of storage positions corresponding to the printing positions per printing line are arranged. One of the storage positions has a normal print position as a normal print position and a half print position located between adjacent normal print positions. Further, each storage location includes a first storage part for storing a character code CC corresponding to the first printed character, and a second storage part for storing a character code CC corresponding to the second printed character. It has a storage part and a flag F for storing the presence or absence of an underline.

Further, the print control circuit 3 outputs an erase drive signal EDS to the erase mechanism 6 in response to an erase command signal ES generated by operating the erase key 2d, and erases adhesive chips etc. provided on the erase mechanism 6. The medium 6a is positioned between the printing paper and the printing mechanism 4, and the character code CC corresponding to the printed character is read from the storage portion at each storage position corresponding to the normal printing position or the half printing position, and the character code A printing signal PS corresponding to CC is output to the printing mechanism 4, and the same character as the printed character is erased via the erasing medium 6a.

Note that when the printing mechanism 4 finishes the printing operation by operating the character key 2a, the printing head (not shown) of the printing mechanism 4 performs a spacing operation to the next normal printing position in the printing line direction, and Accompanying the spacing operation, address signals indicating storage positions corresponding to printing positions in the memory 5 are sequentially switched.

Next, as shown in Figures 2 to 4, place +3 at the printing position.
The operation of this embodiment will be explained by taking as an example a case where printed characters sequentially printed on a screen are automatically erased.

First, to explain the printing operation, when the character key 2a, dead key 2b, backspace key BS, half backspace key HBS, and half forward space key HFS are operated in the order shown in FIG. PS is output to the printing mechanism 4, and characters -, +3, ¥, 13. up, λ
are sequentially printed, and as shown in FIG. Store code CC.

When automatically erasing printed characters, after positioning the print head at the half print position (K+3)h by operating the backspace key BS, half backspace key HBS, etc., press the erase key 2d once. The print control circuit 3 outputs the erase drive signal EDS to the erase mechanism 6 in response to the erase command signal ES, and moves the erase medium 6a to the half print position (
K+3)h, and the first at the storage position MK+3 corresponding to the half printing position (K+3)h.
, character codes CC corresponding to the print characters "-" and 'A' are sequentially read from the second storage portions h1 and h2, and print signals PS corresponding to the character codes are outputted to the printing mechanism 4, respectively. The printing mechanism 4 sequentially erases the printed characters "-" and "A" through the erasing medium 6a, and the erasing medium 6a peels off the carbon of the printed characters attached to the printing paper, and the half printing position ( K+3)h
Automatically delete the composite character “λ” in .

Furthermore, when automatically erasing the printed characters "HP" printed at the normal printing position (K+2)n and the half printing position (K+2)h at printing position +2,
By one operation of the erase key 2d, the print control circuit 3 first erases the memory position MK corresponding to the half print position (K+2)h.
After reading the character code CC corresponding to the printed character "P" from the first storage part h1 of +2 and erasing the printed character "P" by backspacing the print head, the normal printing position (K+2 ) The character code CC corresponding to the print character "H" is read from the first memory part n1 of the memory location MK+2 corresponding to n, and the print head is operated in a half-pax basting operation to erase the print character "H" and print. The printed character "HP" at position +2 is automatically erased.

Also, when erasing the composite character "\" d, move the print head to the print position and +1, respectively.
When the erase key 2d is pressed once, the first one at the memory storage position corresponding to the normal printing position is deleted in the same way as above.
, character codes CC corresponding to the composite characters are sequentially read from the second storage portions n1 and n2, and print signals PS corresponding to the character codes CC are outputted to the printing mechanism 4, respectively. As a result, the printing mechanism 4 sequentially erases the printed characters corresponding to each printed character via the erasing medium 6a, and the carbon of the printed characters attached to the printing paper is peeled off by the erasing medium 6a.
The composite characters "V" and "d" are automatically deleted.

Further, in the above embodiment, an example in which each storage location has two storage portions has been described, but it goes without saying that the effect will be greater if each storage location has three or more storage portions.

Effects of the Invention As explained above, the present invention stores characters printed on printing paper by a printing mechanism as a character code, and also has a memory having a flag for storing whether or not the printed characters are underlined. In a typewriter equipped with a typewriter, when the storage means is a composite character that prints a combination of two characters at the same printing position by operating a dead key and a character key, a character corresponding to the first printed character of the composite character. It has a first storage area that stores a code in correspondence with a printing position, and a second storage area that stores a character code corresponding to a second printing character of a composite character in correspondence with a printing position. When erasing a composite character printed on a sheet of paper, the character code is sequentially read out from the first storage area and the second storage area of the storage means in response to one operation of the erase key. Composite characters formed from two characters can be automatically erased according to the code, greatly improving erasing efficiency. In addition, all printed characters at any printing position can be automatically and reliably and easily erased by a single operation of the erase key, so all you need to do is perform key operations according to the printing condition, which is an advantage that does not cause any discomfort to the operator. This is the realization of a typewriter.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a typewriter according to the present invention, Fig. 2 is a block diagram of a typewriter according to the present invention;
FIG. 3 is an explanatory diagram showing the sequence of key operations, FIG. 3 is an explanatory diagram of codes showing printed characters corresponding to printing positions, and FIG. 4 is an explanatory diagram showing the storage state of storage positions arranged in the memory. In the figure, 1 is a keyboard, 2a is a character key, 2b is a dead key, 2d is an erase key, 3 is a print control circuit, 4 is a print mechanism, 5 is a memory, 6 is an erase mechanism, 6a is an erase medium, CC
is the character code.

Claims (1)

[Scope of Claims] 1. A keyboard provided with a large number of character keys and an erase key, a printing mechanism that prints characters on printing paper in response to the operation of the character keys, and a keyboard that prints characters on printing paper in response to the operation of the character keys; a spacing means for performing a spacing operation; an erasing mechanism for erasing characters printed on printing paper by the printing mechanism in response to an operation of the erasing key; In a typewriter equipped with a storage means having a flag for storing a code as well as a flag for storing the presence or absence of an underline of a printed character, after printing, a dead key without a spacing operation by the spacing means is stored. Provided on the keyboard, in the case of a composite character in which two characters are printed in combination at the same printing position by operation of the dead key and a character key, the storage means corresponds to the first printed character of the composite character. It has a first storage area that stores a character code in correspondence with a printing position, and a second storage area that stores a character code corresponding to a second printed character of the composite character in correspondence with a printing position. , when erasing composite characters printed at the same printing position on the printing paper, one operation of the erasing key will erase the composite characters according to the character codes sequentially read from the first and second storage areas of the storage means. A typewriter capable of erasing composite characters, characterized in that the erasing mechanism includes a control means for erasing the corresponding composite characters.