JPH0453780A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To obtain an electronic typewriter which keeps secret if characters remain in an erased tape by erasing characters in a designated area continuously in printing order or reverse order through an erasure means, if a special instruction for erasure is entered. CONSTITUTION:If a character A is erroneously printed on a sheet surface for example, an erasure key on a keyboard is pressed to move a type A of a type wheel and an erasure tape 34 so that the type A is placed at an opposite position to the erroneous character A on the sheet surface 14, and then the character A is struck using a type hammer 28. In turn, an ink is scraped off the adhesive surface on the sheet surface 14 side of the erasure tape 34 and characters can be erased from the sheet surface 14. An erasure means consists of the erasure tape 34, the type hammer 28 and other parts, and is mounted on a carrier 16. Further, the erasure means moves in a printing line direction with the carrier 16. The keyboard 10 instructs a function such as a continuous character erasure sequence in an area erasure process in printing order as a character erasure order and a different order from the reverse order.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to electronic typewriters.

(Prior Art) Conventionally, electronic typewriters are provided with erasing means for erasing characters (groups) erroneously printed on paper.

When the erasing means is activated when an erroneous print is made on the paper, an erasing tape is inserted between the erroneously printed character on the paper and the type corresponding to the character, and then a hammer strikes the type. The paper side of the erasing tape is an adhesive surface, and the ink of the printed characters is peeled off to the adhesive surface, and the printed characters are erased. 1 for erasing method
In addition to the method of erasing character ends one by one, there is also a method called area erasing.
There is a method of successively erasing all printed characters within a pre-specified range.

(Problems to be Solved by the Invention) However, the above-mentioned conventional electronic typewriter has the following problems.

When erasing is performed, the ink removed from the paper remains on the erasing tape as mirrored letters with the left and right sides reversed. In particular, when area erasing is performed, erased characters remain on the erasing tape as sentences or phrases, making the erased contents legible, which poses a problem in terms of confidentiality. If a high degree of secrecy is required, the erasing tape must also be disposed of, which is both troublesome and uneconomical.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electronic typewriter that can maintain confidentiality even if characters remain on the erasing tape.

(Means for solving problems) In order to solve the above problems, the present invention includes the following configuration.

In other words, area designation specifies a specific area among a group of characters printed on paper, and special erasure instructions are used to erase characters within the specified area in an order different from the printing order and vice versa. A keyboard with function keys that can be input, an erasing means for erasing characters printed on paper using an erasing tape, a carrier equipped with the erasing means and movable along the printing line, and an area specification. storage means for storing characters in the specified area and the printing position of each character; control means for sequentially erasing in an order different from the order of.

(effect) The effect will be explained.

Since the erasing order is different from the printing order and vice versa, it is possible to read the ink stripped off to the erasing tape and make it incomprehensible.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the configuration will be explained with reference to FIG. 1 (a perspective view of an electronic typewriter according to an embodiment) and FIG. 2 (a block diagram thereof).

Reference numeral 10 denotes a keyboard, which includes character keys for instructing letters, numbers, and symbols (hereinafter referred to as characters) to be printed on the paper surface 14 of the paper 12, selection of uppercase and lowercase letters of the alphabet, instructions for erasing printed characters, and printing. Designation of area erasing range in which characters in a specific range are continuously erased from a group of characters that have been erased; It is composed of function keys for instructing functions such as special erasing instructions that are performed continuously.

The carrier 16 is adapted to be shifted in the left-right direction by a carrier motor 20 driven via a carrier driver circuit 18. For example, the carrier 16 rotates for one character (for example, one
/10 inch) is designed to shift left and right. The carrier 16 shifts to the right when the carrier motor 20 rotates in one direction, and shifts to the left when the carrier motor 20 rotates in the other direction. Carrier 16 is commonly known as Daisy.
A type wheel 22, called a wheel, is provided, and the type wheel 22 is attached to a wheel motor 26 driven through a wheel driver circuit 24, and the rotational position of the wheel motor 26 selects the type. The selected characters are struck onto the paper surface 14 by the type hammer 28 via the ink ribbon 27 and printed on the paper surface 14. That type of hammer 28 is actuated by a hammer solenoid 32 driven by a hammer driver circuit 30.

Reference numeral 34 denotes an erasing tape. For example, when the letter "A" is mistakenly printed on the paper surface 14, the erase key on the keyboard 10 is pressed and the printed character "A" on the type wheel 22 is erased so as to face the incorrect letter "A" on the paper surface 14. Move AJ and erase tape 34,
Hit the type "A" with the type hammer 28 ((erase hammering)).

Then, the ink is peeled off from the adhesive surface of the erasing tape 34 on the paper surface 14 side, and the characters on the paper surface 14 can be erased. At that time, the type on the type wheel 22 and the paper surface 1
Moving the erasing tape 34 up between 4 and 4 is effected by actuation of a tape lift solenoid 38 which is driven by a tape lift driver circuit 36. Further, when erasing is completed -1, the erasing tape 34 is wound up by one character. The winding is performed by a tape winding mechanism 42 driven by a tape winding driver circuit 40.

Note that the erasing tape 34, the type hammer 28, etc. constitute an erasing means, and the erasing means is mounted on the carrier 16.
It is movable together with the carrier 16 in the printing line direction.

The paper 12 is pressed against the outer peripheral surface of a platen 44 by a roller (not shown) or the like, and by rotating this platen 44, it is possible to change the print line.

Forward rotation, which is rotation of the platen 44 in the feeding direction of the paper 12, or reverse rotation, which is rotation in the feeding direction of the paper 12, is instructed by pressing the line feed instruction key on the keyboard 10. The platen 44 is a platen driver circuit 4
It rotates in accordance with the rotation of the platen motor 48 driven by the platen motor 6, thereby enabling a changeover operation.

When the platen motor 48 rotates, for example, 1/3, the platen 44 rotates by one line.

The electronic typewriter according to the present invention is controlled by a microcomputer, and the system will be explained.

50 is a certain RAM which is a storage means and includes a first memory 52 and a second memory 54.

The first memory 52 stores characters manually input from the keyboard 10 and printed on the paper surface 14, and also stores the printing position of the printed characters on the paper surface 14. The printing position is constantly detected by a microprocessor (MPU) 60, which is a motor rotation detection means, a control means, and the like. The printing position in the left-right direction with respect to the paper surface 14 can be determined by the MPU 60 measuring the rotation direction and amount of rotation of the carrier motor 20, and can be determined by the distance from the home position, for example.

On the other hand, the printing line in the vertical direction with respect to the paper surface 14 can be determined by the MPU 60 measuring the rotational direction and amount of rotation of the platen motor 48, and can be determined by the distance from the printing start line, for example.

When an instruction to erase an area is input to the second memory 54, the data of the characters in the area and each printing position of each character on the paper surface 14 are read out from the first memory 52 and stored therein.

The MPU 60 serves as a control means and controls the operation of the electronic typewriter according to a control program 82 stored in a ROM 80.

Note that 84 is a display.

Next, a first example of the special erasing operation of the electronic typewriter configured as described above will be explained with reference to the flowchart of FIG.

An instruction to erase an area is input from the keyboard 10, and data of characters and printing positions in the area are stored in the second memory 54, and preparations for erasing the area are completed.

Here, when a special erase instruction is input from the keyboard 10, the MPU 60 searches the second memory 54 to check whether there is a character (ignoring spaces).
Step 100). If there is no character, there is no need to erase it, and the erasing operation ends.

If the character exists in step 100, MPU6
0 uses its own random number generation function to generate one random number. A number code is assigned in advance to a printable character, and one random character is determined by comparing the generated random number and the number code (step 102).

The MPU 60 checks whether a character equal to the random character exists in the second memory 54 (
Step 104). If a character equal to the random character does not exist, the process returns to step 102 and continues until an equal character is generated as a random character.

In step 104, if a character equal to the random character exists in the second memory 54, that character is made to face the character on the paper surface 14. Then, the erasing means is activated to erase the printed character, and the contents of the first and second memories 52, 54 are also updated (step 106).

Subsequently, the process returns to step 100, and the same operation is repeated to erase all characters within the designated area, and the process ends.

Next, a second example of operation will be explained with reference to the flowchart of FIG.

When there is a specific erasure instruction, the MPU 60 erases the second memory 5.
Whether there is a character (ignoring spaces) within 4.t
1 is approved (step 150). If there are no characters, the process ends in the same way as the first operation.

If the character exists in step 150, the MPU60
erases the last (hereinafter referred to as the lowest) character in the specified area through the erasing means (step 152).

It is checked again whether there is a character in the second memory 54 (step 153), and if there is not, the process ends.

If it exists, the contents of the first and second memories 52, 54 are updated so that the character one level higher than the previously erased lowest character becomes the lowest character (step 154).

Next, the first character (hereinafter referred to as the top character) in the specified area is erased using the erasing means (step 156).
.

It is checked again whether there is a character in the second memory 54 (step 15B), and if there is not, the process ends.

If the character exists, the contents of the first and second memories 52 and 54 are updated so that the character one level lower than the previously erased highest character becomes the highest character (step 160). Then, the process returns to step 152, and the lowest and highest characters are alternately deleted until all characters in the area are deleted.

In either of the above two operation examples, the order of the characters remaining on the erasing tape 34 is neither the printing order nor the reverse order, so even if they can be read, the characters will be a string of meaningless characters, making it difficult to protect the secret. can.

Although various aspects of the preferred embodiments of the present invention have been discussed above,
It goes without saying that the present invention is not limited to the embodiments described above, and that many modifications can be made without departing from the spirit of the invention.

(Effects of the Invention) When using the electronic typewriter according to the present invention, even if area erasing is performed, the characters are not erased in the printing order or vice versa, so ink remaining on the erasing tape remains. The secret will not be leaked when someone reads your text. Further, since there is no need to dispose of the erasing tape in order to protect the secret, time and effort can be saved, and there is also the need to dispose of the erasing tape in the middle of use.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of an electronic typewriter according to the present invention, FIG. 2 is a block diagram thereof, and FIGS. 3 and 4 are flowcharts showing an example of its operation. 10 ・ 16 ・ ・ 28 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 22 ° type hammer Toso...Paper surface, -Type wheel,...Erase Chilenoid 0...Mic

Claims (1)

[Claims] 1. Area specification for specifying a specific area among a group of characters printed on paper, and erasing characters within the specified area in an order different from the printing order and the reverse order. Equipped with a keyboard with function keys that can input special erasing instructions, an erasing means for erasing characters printed on paper using erasing tape, and a device that can move along the printed line. a carrier for storing characters in the specified area and a printing position for each character; and a storage means for storing the characters in the specified area and the printing position of each character; An electronic typewriter characterized by comprising: control means for successively erasing in an order different from the printing order and the reverse order. 2. The electronic typewriter according to claim 1, wherein the erasing order of the special erasing is random. 3. The electronic typewriter according to claim 1, wherein the erasure order of the special erasure is a predetermined order.