JPH0321483A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To certainly erase a region even when skew is generated in paper by measuring the degree of inclination of a character row to calculate the presently corrected printing positions of the respective characters of said character row and moving the characters to the corrected printing positions thereof to perform erasure hammering. CONSTITUTION:When a CPC key is pushed down to give instructions so as to perform the correction of a character position after a user indicates the erasure of a region and the corrected printing position of the start end character 72 of a character row 68b is detected, an MPU 60 stores the corrected printing position in the third memory 56. Succeedingly, when the corrected printing position of the terminal character 74 of the character row 68b is detected, the MPU 60 stores said corrected printing position in the fourth memory 58. Then, the MPU 60 calculates the inclination of the character row 68b and also calculates the corrected printing positions of the respective characters of the character row 68b by operational processing to store the calculated data in the second memory 54. Next, erasure hammering is performed by an erasure means and one character of the character row 68b is erased from the surface of paper.

Description

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

(Background Art) First, a method for erasing characters (letters, numbers, symbols) printed by a typewriter will be explained. For example, when erasing the characters rA,1 printed on paper,
Enter the erase instruction by pressing the function key on the keyboard that instructs the erase function.

The carrier is then moved laterally to face the eraser tape and the type letters rAJ of the type wheel. Next, the character key "A" on the keyboard is pressed to hit the character "A" printed on the paper, and the character "A" printed on the paper is struck with the typed hammer using the erasing tape. This is called erasure hammering. The paper-side side of the erasing tape is an adhesive surface, and the characters on the paper
The ink displaying "A" is peeled off by the adhesive surface of the erasing tape, and the character "A" is erased from the paper. The above-mentioned erasure hammering is for erasing one character "A", but when actually using a typewriter, it is often the case that a typing error is noticed after several characters have been printed. It is inefficient to erase a large number of characters one by one using the procedure described above. Therefore, some electronic tiewriters are provided with a function called area erasing to continuously and automatically erase a plurality of characters. In the case of an electronic typewriter, the printed characters and their printing positions are stored in the memory, and when the user specifies the area to be erased, the characters within the specified area are erased using the erase hammer described above. Ru. This erasure hammering is performed for each character while moving the carrier in the horizontal direction. For example, if the character string to be erased is several lines before the line currently facing the carrier, The platen must be rotated back so that the line is facing the carrier.

At this time, slippage may occur between the platen and the paper, and skew may occur in the paper. Therefore, the array of mullactors to be erased may be tilted with respect to the moving direction of the carrier. In this case, since erasure hammering can only be performed linearly, there is a problem in that it is not possible to reliably erase all the characters in the character string.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electronic tie writer that can reliably erase areas even when skew occurs in paper.

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

In other words, a character key for instructing the character to be printed on the paper surface pressed against the platen, an instruction for erasing the area,
The carrier is provided with a keyboard having function keys for instructing functions such as character position correction instructions, and a printing means such as type, hammer, etc., and when an area deletion instruction is input from the keyboard, the paper surface is an erasing means capable of continuously erasing a character string printed thereon; a carrier position detecting means for detecting the current position of the carrier in the left-right direction; and a carrier position detecting means detecting the amount of rotation of the platen so that the carrier faces platen rotation amount detecting means for detecting the current position in the vertical direction on the sheet of paper; and a first platen rotating amount detecting means for storing the character inputted and printed manually from the keyboard, and storing the printing position of the character on the sheet of paper. a second memory that stores each character constituting the character string for which area erasing is instructed and the printing position of the character; a third memory that stores the corrected printing position of the starting character when there is a position correction instruction; and a third memory that stores the corrected printing position of the starting character; and a third memory that stores the corrected printing position of the starting character; and a third memory that stores the corrected printing position of the starting character; a fourth memory for storing the corrected printing position of the character at the end of the character string for which area erasure has been instructed;
, the printing position of the starting character of the character string stored in the second memory and the corrected printing position of the starting character stored in the third memory are compared; The printing position of the terminal character of the character string stored in the second memory is compared with the corrected printing position of the terminal character stored in the fourth memory, and the printing position of the character string before correction is compared. a calculation means for determining the inclination with respect to the print position and calculating the corrected print position of each character stored in the second memory; and the calculation means calculates the corrected print position of each character stored in the second memory. When determining the printing position of each character in the second memory, the printing position of each character is replaced with the corrected printing position, and when executing area erasing, the erasing means is replaced with the corrected printing position stored in the second memory. It is characterized by comprising a control means for moving to a printing position and erasing.

(effect) The effect will be explained.

The starting character of the character string to be erased by the calculation means, the corrected printing position which is the current position of the ending character, and the printing of the starting end character and ending character before correction stored in the second memory. By determining the positional shift, the slope of the character row is measured,
The current printing position of each character in the character string, that is, the corrected printing position, is determined, and the character is moved to the corrected printing position and erase hammering is performed, so the character string to be erased due to paper skew is Even if the image is tilted, it can be erased reliably.

(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).

10 is a keyboard, which has character keys for instructing letters, numbers, and symbols (hereinafter referred to as characters) including spaces to be printed on the gimen 14 of the gi 12, as well as selection of uppercase and lowercase letters of the alphabet, and area erasure (AC). , an area erasure start point (ST) instruction, an area erasure end point (SP) instruction, and a character position correction (CPC) instruction.

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 is configured to shift one character to the left or right every time the carrier motor 20 rotates 1/8. The carrier l6 is provided with a type wheel 22 commonly called a daisy wheel, and the type wheel 22 is attached to a wheel motor 26 driven via a wheel driver circuit 24.
The type of type is selected depending on the rotational position of the wheel motor 26. The selected type is struck onto the paper surface 14 by a type hammer 28 via an ink ribbon (not shown) and printed on the paper surface 14. The type hammer 28 is a hammer solenoid 3 driven by a hammer driver circuit 30.
It is activated by 2. These type wheel 22, type hammer 28, etc. act as a printing means.

34 is an erasing tape; for example, when the letter "A" is mistakenly printed on the Gime 14, the erase key on the keyboard 10 is pressed and the type wheel 22 is moved so that it is opposite to the erroneous letter "A" on the Gime 14. Move the printed letter "A" and the erasing table 34,
Hit the type "A" with the tie hammer 28 (erasing hammering). Then, the ink is peeled off from the adhesive surface of the erasing table 34 on the side of the Gime l4, making it possible to erase the characters on the Gime l4. At this time, the erasing tape 34 is moved upward between the type characters on the type wheel 22 and the Giomasu I4 by operating a tape lift solenoid driven by a tape lift driver circuit 36. Further, once erasing is completed, the erasing tape 34 is wound up by one character. The winding is done by the tape winding driver circuit 40.
This is done by a tape winding mechanism 42 driven by.

The erasing operation is performed by the above-mentioned erasing table 34, tie hammer 28, etc., which constitute erasing means.

The above-mentioned printing means and erasing means are mounted on the carrier 16, and move together with the shift of the carrier 16 in the left and right direction.

The guide 12 is pressed against the outer peripheral surface of the platen 44 by a roller (not shown) or the like, and by rotating the platen 44, it is possible to change the printing line. The platen 44 rotates with the rotation of a platen motor 48 driven by a platen driver circuit 46, thereby enabling a changeover operation. For example, the platen motor 48
When the platen 44 rotates three times, the platen 44 rotates by one line.

The electronic tie writer according to the present invention has an area erasing function controlled by a microcomputer, and the system will be explained below.

50 is a RAM, which includes a first memory 52, a second memory 54, a third memory 56, and a fourth memory 58.

The first memory 52 stores characters input from the keyboard 10 and printed on the paper surface 14, and also stores the printing position of the printed characters on the surface 14. The printing position is determined by a microprocessor (MPU) that is a character position detection means, a platen rotation amount detection means, etc.
60 is always detected. The printing position in the left and right direction with respect to the paper surface 14 can be determined by the MPU 60 measuring the amount of rotation of the carrier motor 20 and, for example, from the distance from the home position. On the other hand, the printing position in the vertical direction with respect to the surface 14 can be determined by the MPU 60 measuring the amount of rotation of the platen motor 48 and, for example, from the distance from the printing start line.

The second memory 54 stores each character of the character string whose area is to be erased and the print position of each character. When the AC key 62 of the keyboard 10 is pressed, the MP
The U 60 determines area deletion, and uses the character input after the ST key 64 as the first character of the character string to be the start character for area deletion, and the character input after the SP key 66 as the last character of the character string. It is determined that the character is the end character for erasing the area, and the character string between the start character and the end character and the print position of each character in the character string are read from the first memory 52 and stored in the second memory 54.

The third memory 56 stores the corrected printing position of the starting character of the character string to be erased.

For example, if the character string to be erased is a few characters earlier, it is necessary to rotate the platen 44 to return the paper 12, but when the platen 44 is rotated, the paper 12 is skewed, as shown in FIG. As shown in FIG. 3, the character row 68b after the skew has occurred may be tilted more than the character row 68a which serves as a reference during printing. When such an inclination occurs, even if erasing hammering is performed along the character row 68a serving as a reference, erasing cannot be ensured.

The user then presses the CPC key 70 and inputs to the MPU 60 that the character position is to be corrected. First, the user rotates the carrier motor 20 and the platen motor 48 in microsteps to make the carrier 16 face the starting character 72 of the character row 68b. Then, press the erase key to perform erase hammering, and erase the starting character 72.
If there is any remaining data, the carrier motor 20 and platen motor 48 are further rotated in microsteps to slightly move and adjust the position of the carrier 16, thereby ensuring that the starting character 72 is erased. Find the location.

Once the position is determined, press the ST key 64. As a result, the MPU 60 detects carrier 1, which is constantly detected as described above.
The corrected printing position of the start character 72 based on the position 6 is stored in the third memory 56.

The corrected printing position of the terminal character 74 of the character string 68b is stored in the fourth memory 58. The procedure for finding the corrected printing position of the end character 74 is the same as the procedure for finding the corrected printing position of the starting character 72, so the explanation will be omitted. The MPU 60 is a carrier position detecting means, a platen rotation amount detecting means, and also serves as a calculation means and a control means. When a character position correction instruction is input and the corrected print position data is stored in the third memory 56 and fourth memo +758, the MPU 60 retrieves the reference character before correction from the second memory 54. The position of the starting character 76 in the column 68a is read and stored in the third memory 56.
Starting character 7 of character string 68b after skewing
The deviation from the position of 2, X, and yI are calculated. Also,
Similarly, the MPU 60 reads the position of the end character 78 of the reference character string 68a before correction from the second memory 54, and calculates the deviation from the position of the end character 74 of the character string 68b after skew in the fourth memory 58, Xt, V
Find z by calculation. As a result, the inclination of the character row 68b with respect to the character row 68a, which is the reference, is determined. Once this slope is determined, the MPU 60 uses the character string 68b.
Correct the printing position of each character comprising the character. Since the spacing between the characters in the character row 68b can be known from the print position information of each character in the second memory 54, the corrected position of each character can be determined by calculation processing from the previously determined inclination. Next, the MPU 60 replaces the print position of each character in the second memory 54 with the corrected print position obtained by calculation. Furthermore, the MPU 60, as a control means, controls the operation of the electronic typewriter according to the control program 82 installed in the ROM 80. This will be explained with further reference to the flowchart in the figure.

After the user specifies area erasure as described above, the user presses the CPC key 70 to instruct to correct the character position (step 100), and when the corrected printing position of the starting character 72 of the character string 68b is detected. , M.P.
U60 stores the corrected print position in third memory 56 (step 102). Next, character string 6
When the corrected printing position of the end character 74 of 8b is detected, the MPU 60 transfers the corrected printing position to the fourth
(step 104).

Then, the MPU 60 calculates the inclination of the character string 68b (step 106), calculates the corrected printing position of each character in the character string 68b, and stores it in the second memory 5.
4 (step 108).

Next, the erasing means performs erasing hammering to erase the character of the character string 68b from the paper surface I4. In this case, the erasing direction does not matter, but the terminal character 7
It is preferable to erase from the direction of 4 toward the starting character 72. After deleting one character from the top of paper 14, MPU6
0 erases the erased character from the second memory 54 (
Stethop 110).

If it is determined that there are still characters to be erased in the second memory 54 (step 112), the carrier I6 is shifted by one character (step 114), and the process returns to step 110 to erase the next character. After all the characters in the character string 68b have been erased, the second
When there is no more data in the memory 54, the MPU 60 determines that erasing the area is complete (step 112), clears the second memory 54, third memory 56, and fourth memory 58, and returns to normal mode (step 116). ).

Although not shown, the start and end characters for erasing the area are input to the second memory 54 using the carrier 1.
6 to a position facing the starting or ending character, and having the MPU 60 recognize the position.
The character corresponding to the position of the carrier 16 in the first memory 52 may be read out and stored in the third memory 56 and the fourth memory 5th.

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

(Effects of the Invention) When the electronic quiwriter of the present invention is used, it is not necessary to adjust the position of the carrier for erasing each character even if paper skew occurs when erasing an area and the character row is tilted. This enables automatic and reliable continuous erasing, which improves work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electronic typewriter according to the present invention, FIG. 2 is a block diagram thereof, and FIG. 3 is an explanatory diagram showing a state in which character rows are tilted due to paper skew.
FIG. 4 is a flowchart showing a part of the procedure for erasing an area. 10...Keyboard, 14...Paper, 16...
- Carrier, 22... Type wheel, 28... Type hammer, 34... Erasing tape, 44... Platen, 52... First memory, 54... Second
memory, 56... third memory, 58... fourth memory
memory, 60... microprocessor, 68a, 68b... character string.

Claims (1)

[Scope of Claims] 1. A keyboard having a character key for instructing a character to be printed on a sheet of paper pressed against a platen, and a function key for instructing functions such as an instruction to erase an area and an instruction to correct a character position; an erasing means provided on a carrier equipped with a printing means such as type, a hammer, etc., and capable of continuously erasing character strings printed on the paper surface when an area erasing instruction is input from the keyboard; carrier position detection means for detecting the current position of the carrier in the horizontal direction; and platen rotation amount detection means for detecting the rotation amount of the platen to detect the current position in the vertical direction on the paper surface that the carrier faces. a first memory that stores the characters input and printed from the keyboard and stores the printing position of the characters on the paper surface; a second memory for storing the printing position of a character; and a second memory for matching the carrier with the starting character of the character string to be erased, and storing the corrected printing position of the starting character when there is a character position correction instruction. a third memory for matching the carrier with the terminal character of the character string to be erased, and printing after correction of the terminal character of the character string for which area erasure is instructed when a character position correction instruction is given; a fourth memory for storing positions; a print position of a character at the start end of the character string stored in the second memory and a corrected print position of the character at the start end stored in the third memory; and comparing the print position of the last character of the character string stored in the second memory with the corrected print position of the last character stored in the fourth memory. a calculation means for determining the inclination of the character string with respect to the print position before correction, and calculating the corrected print position of each character stored in the second memory; When the corrected printing position is determined, the printing position of each character in the second memory is replaced with the corrected printing position, and when the area erasing is executed, the erasing means is stored in the second memory. 1. An electronic typewriter, comprising: control means for moving the print position to the corrected print position and erasing the print position.