JPS627583A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To minimize storage capacity of a memory part and reduce cost, by a method wherein correcting lines are successively printed at minute intervals on a character to be corrected by a linear correcting type through a correction ribbon. CONSTITUTION:At the tip one spoke of a print wheel 13 is provided the linear correcting type 16 which has a height not smaller than the height of the other types 12 and a width of DELTAL. When correcting a character, the correcting type 16 is struck against a printing paper through the orrection ribbon 15, whereby a part of the character image corresponding to the width of a vertical line is erased, since the color of the ribbon 15 is the same as that of the printing paper. Next, the carriage 11 is moved forward by the width DELTAL of the correcting type 16, and the vertical line is again parinted on the paper by the type 16 through the ribbon 15. This operation is repeated, and when the count N on a minute displacemen counter R2 reaches a prescriabed value NM, correction (erasure) of the previously printed character is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in an electronic typewriter that corrects printed characters using a correction ribbon having the same color as the printing paper.

[Prior Art] In an electronic typewriter using a printing wheel having type characters formed at the tip of each spoke, printing is normally performed using the following procedure. That is, by sequentially inputting character keys indicating characters to be printed from the keyboard, the spoke address of the printing wheel where the printed character corresponding to this character is formed is searched for using the character code corresponding to the character key. When the spoke address of the corresponding character is retrieved, the printing wheel is rotated to make the corresponding character face the printing paper set on the platen. At the same time, the carriage is moved to the printing position on the printing paper. Then, the corresponding type is struck with a printing hammer onto the printing paper set on the platen via the printing ribbon. The corresponding characters are then printed out on the printing paper.

When a mistake is found in a printed character and the character is to be corrected (erased), the carriage is moved back to above the corrected character. Then, a type identical to the corrected character is selected on the print wheel, and this type is struck onto the corrected character on the printed sheet through a correction ribbon of the same color as the printed sheet. As a result, the previously printed characters are corrected (erased).

[Problems to be Solved by the Invention] However, the electronic typewriter in which printed characters are corrected using the same typeface as the corrected character as described above has the following problems. In other words, in order to automatically correct characters that have already been printed out, for example, by operating a correction key, it is necessary to search for the same typed characters at the time of correction, so at least the character code that is currently being printed out and the character code that is expected to be corrected must be searched for. data (character code, print strength, carriage position, etc.) must be memorized. However, the capacity of the storage section for storing such data has a certain limit due to constraints such as manufacturing costs. Therefore, it is difficult to go back and correct characters that have already been printed out.

Also, when making corrections, in order to overprint the same characters in the same position, if you remove the printing paper from the -H platen, it is almost impossible to set it again in the same place accurately, so if you remove the printing paper, you can make corrections. It was impossible to do so.

The present invention has been made based on these circumstances, and its purpose is to continuously print linear correction type on correction characters at minute intervals via a correction ribbon, even if the number of correction characters is small. To provide an electronic typewriter which can be retroactively corrected without limit even in its storage capacity, and can also be easily corrected even when printing paper is once removed.

[Means for Solving the Problems] The electronic typewriter of the present invention is provided with a correction key for inputting a correction command for characters that have already been printed out, and is provided with a correction key at the tip of a spoke of the printing wheel to input a correction command for each printed character. Forming linear type correction type having a height greater than the character height,
Then, in response to the key input operation of the correction key, while moving the printer over the character to be corrected, the linear shape of the correction type is passed from one end of the correction character through a correction ribbon of the same color as the printing paper. Printing is performed continuously at minute intervals up to the other end.

[Function] With an electronic typewriter configured in this way, when the correction key is pressed, the carriage moves over the character to be corrected, and at the same time, the linear shape of the correction type is changed to the correction character by the correction type. Continuous printing is performed at minute intervals from one end to the other. As a result, the corrected characters are corrected (8
1) will be done.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view showing an electronic typewriter according to an embodiment. In the figure, reference numeral 1 denotes a housing, a keyboard 2 is provided on the front surface of the housing 1, and a platen 4 for setting printing paper 3 is provided at the upper part of the housing 1. Furthermore, a display section 5 is provided on the front surface of the housing 1 to display a cursor indicating the carriage position, a tab set position, left and right margin positions, etc., and is adjacent to the keyboard 2 to display characters entered using the keys from the keyboard 2. CRT display section 6
is installed. The CRT display section 6 is formed of a small and thin CRT tube, and the angle of the display screen can be freely adjusted to make it easier for the typist to view.

The keyboard 2 includes a space key 8, in addition to character keys 7 such as alphabet keys and numeric keys. Various function keys such as a carriage return key, tab set key, and correction key 9 are arranged.

FIG. 2 shows the inside of the casing 1, in which a carriage 11 is movably attached to a shaft 10 arranged parallel to the platen 4 and whose movement is controlled in the axial direction of the platen 4 by a carriage motor (not shown). .

The carriage 11 includes a print wheel 13 with type 12 formed at the tip of each spoke. A print wheel motor 14 rotates the print wheel 13, and a correction ribbon 151 (not shown) of the same color as the print paper 3 set on the platen 4.

Each ribbon feed motor ribbon feeds each ribbon.

Each ribbon shift mechanism that moves each ribbon up and down, a printing hammer that strikes each type 12 of a printing wheel 13 onto printing paper 3 set on a platen 4, etc. are mounted.

At the tip of one of the spokes of the printing wheel 13, as shown in FIG. Type 1
6 is formed. Note that in the embodiment, the value of ΔL is set to 0.2-1.

FIG. 4 is a block diagram showing a schematic configuration of an electronic typewriter. The CPU 17 is a CPU (Central Processing Unit) that executes information calculation processing on various key signals input from the keyboard 2. A ROM 19 that stores fixed data such as spoke addresses of the print wheel 13 on which the type 12 corresponding to the input character code is formed. A RAM 20 that temporarily stores various variable data such as the carriage position and various counters, and a keyboard input circuit 21 that receives key signals from the keyboard 2. A CR7 display circuit 22 that sends display data to the CR7 display section 6. Hammer solenoid drive circuit 24 for the hammer solenoid 23 that drives the printing hammer. Motor drive control circuit 25 for driving and controlling various motors. Print ribbon shift mechanism 26 that moves the print ribbon up and down. Correction ribbon 1
The correction ribbon shift mechanism 27 and the like that move the ribbon 5 up and down are controlled.

The motor drive control circuit 25 includes a paper feed motor 28 connected to the platen 4 for feeding the printing paper 3.
A carriage motor 29 for controlling the movement of the carriage 11.
the printing wheel motor 14; a printing ribbon feed motor 30 for feeding the printing ribbon; A correction ribbon feed motor 31 for feeding the correction ribbon 15 is connected thereto.

As shown in FIG. 5, the RAM 20 includes a work area R1 in which storage areas such as left and right margin positions of the carriage 11, tab set positions, etc. are formed, as well as a work area R1 in which characters that have already been printed are corrected (erased). A minute movement counter R2 counts the number N of printing of the correction type 16 when printing, and the number of characters from the left margin position indicating the position of the carriage 11 (
A carriage position counter R3 for counting the character pitch number (CN) is formed.

When the power of this electronic typewriter is turned on, the CP (J17) is configured to execute printout processing according to the flowchart of FIG.

That is, when the flowchart is started, various initial processing is executed, and then the keyboard input circuit 2 is input from the keyboard 2 at Pl.
It has a key signal input via 1. When a key signal is input, the type of the input key signal is checked. If the key signal input at P2 is for a character key 7 such as an alphabetic key or a numeric key, the print wheel 1 corresponding to the character code of the corresponding character key 7 is stored in the ROM 19.
Read the spoke address of 3. Then, the print wheel 13 is rotated by the print wheel motor 14 via the motor drive control circuit 25 so that the printed characters 12 corresponding to the corresponding character code face the print paper 3 set on the platen 4. As the printing wheel 13 is rotated, a printing ribbon shift mechanism 26 using an electromagnet or the like is driven to raise the printing ribbon until it is positioned between the type 12 and the printing paper 3. And hammer solenoid drive circuit 2
4, the hammer solenoid 23 is energized. Then, the printing hammer is driven and the corresponding type 12 is struck onto the printing paper 3 via the printing ribbon.

As a result, the corresponding characters are printed out on the printing paper 3. When the printing of the corresponding character is completed, the motor drive control circuit 2
5 to drive the print ribbon feed motor 30 to feed the print ribbon. Simultaneously printing ribbon shift mechanism 2
6 to lower the ribbon position of the printing ribbon. Next, the carriage motor 20 is driven via the motor drive control circuit 25 to move the carriage 11 forward by one pitch (character width cross character interval), and the count of the carriage counter R3 in the RAM 20 is 1! [Increase CN by 1. When the series of printing processes for the character keys 7 inputted from the keyboard 2 are completed, the process returns to Pl and the next key signal input is performed.

If the key signal input at P3 is for the correction key 9, the print wheel motor 14 is driven and the print wheel 13 is activated.
The correction type 16 shown in FIG. At the same time, the carriage motor 29 is driven to move the carriage 11 backward by (1 pitch + 1/2 character width). As a result, the linear portion of the correction type 16 will be opposed to the left end position of the character to be corrected on the printing paper 3. Next, RAM
The count value N of the minute movement counter R2 of 20 is set to the initial value 0.
Set to . Then, the correction ribbon shift mechanism 27 is driven to raise the correction ribbon 15 until it is positioned between the correction type 16 and the printing paper 3.

When the correction ribbon 15 rises to the normal position, the hammer solenoid 23 is energized and the printing hammer prints the correction type 16.
is tapped onto the printing paper 3 via the correction ribbon 15.

Then, a vertical line for correction is printed out at the left end of the corrected character on the printing paper 3. Note that the color of the correction ribbon 15 is the same as that of the printing paper 3.
As a result, the right end of the corrected character is erased by the thickness of the vertical line.

Next, in P5, it is checked whether the count value N of the minute movement counter R2 has reached the specified value NM. The specified value NM is set to the quotient of the maximum width of the type 12 formed at the tip of each spoke of the print wheel 13 divided by the width ΔL of the vertical line of the correction type 16. If the count value N has not reached the specified value NM, the carriage 11 is moved forward by the width ΔL of the correction type 16. After incrementing the count value N of the minute movement counter R2 in the RAM 20 by 1, the process returns to P4 and again prints a vertical line on the printing paper 3 using the correction type 16 via the correction ribbon 15.

When the count value N of the minute movement counter R2 reaches the specified value NM in P5, it is determined that the correction (erasing) process for the printed characters has been completed, and the correction ribbon shift mechanism 27 is driven to move the correction ribbon 15. Lower it. Also, the carriage 11 is
/2 character width, and the count value CN of the carriage position counter R3 in the RAM 20 is subtracted by 1.

Then, it returns to Pl and has the next key signal input.

Note that if the key signal input at P3 is a function key other than the character key 7 or correction key 9, such as a carriage return key or tab set key, normal key input processing corresponding to that key is executed. .

With an electronic typewriter configured in this way, if you want to correct (delete) [0] after printing [A] [)] as shown in Fig. 7, you can press the correction key 9. ,
The center position of the carriage 11 once returns to the left end position of the character [D]. Then, while the carriage 11 moves to the right, NM vertical lines are continuously printed using the correction type 16 at minute intervals of ΔL. Therefore, the [0] character is finally corrected (erased) as shown in FIG.

With an electronic typewriter configured in this way, when the correction key 9 is pressed, only the correction type 16 is selected regardless of the type of character to be corrected, and the correction type 16 is used to print out the data. The character is corrected (IJ left). If you want to go back and correct the characters that have already been printed out by a certain number of characters, move the cursor on the carriage 11 to the character position to the right of the character to be corrected, then press the correction key 9, and the corresponding character will be corrected ( erased). In this way, it is possible to go back and correct characters that have already been printed out without limit.

Therefore, there is no need to store data (character code, print strength, carriage position, etc.) from the character code currently being printed out to the character code expected to be corrected. As a result, the storage capacity of the storage section can be minimized, and the manufacturing cost of the entire electronic typewriter can be reduced.

In addition, in such a correction method, since the entire area of the corrected character is erased with the correction type 16, the alignment accuracy of the correction type 16 with respect to the printed correction character is higher than that in the conventional correction method. No precision is required. Therefore, even if the printing paper 3 is once removed from the platen 4, it can be easily corrected by setting it on the platen 4 again.

It should be noted that the present invention is not limited to the above-described embodiment. In the embodiment, a dedicated correction type 16 is formed on the printing wheel 13, but for example, it is possible to correct a type such as [I] or [1]. It may also be used as a commercial typeface.

[Effects of the Invention] As explained above, according to the present invention, the correction type letters in the form of a thorn are continuously printed on the correction letters at minute intervals via the correction ribbon. Therefore, even if the storage capacity is small, it can be returned and corrected without limit, and the overall manufacturing cost can be reduced. Furthermore, corrections can be made easily even on the printed paper once removed.

[Brief explanation of drawings]

The drawings show an electronic typewriter according to an embodiment of the present invention. Fig. 1 is an external view showing the whole, Fig. 2 is a notched front entrance showing the main parts, and Fig. 3 is for correction purposes. Figure 4 is a block diagram showing the schematic configuration, Figure 5 is a diagram showing the main memory of the storage section, Figure 6 is a flowchart showing the operation, and Figures 7 and 8 are printout diagrams. It is. 1... Housing, 2... Keyboard, 3... Print paper, 4... Platen, 5... Display section, 6... CRT
Display section, 7...Character key, 8...Space key, 9
. . . Correction key, 11 . ...cpu, is...Hasline, 19-R
OMl20-RAM, 23...hammer solenoid,
25... Motor drive control circuit, 26... Print ribbon shift mechanism, 27... Correction ribbon shift mechanism, 28.
... Paper feed motor, 29 ... Carriage motor, 30
Print ribbon feed motor, 31... Correction ribbon feed motor, R2... Minute movement counter, R3... Carriage position counter. Applicant's agent Patent attorney Takehiko Suzue Figure 7

Claims (1)

[Claims] Characters corresponding to the character code entered from the keyboard are printed on the printing paper using printed letters formed at the ends of each spoke of a printing wheel mounted on a carriage that is controlled to move along a platen on which the printing paper is set. In an electronic typewriter for printing out, a correction key for inputting correction commands for characters that have already been printed out, a correction ribbon of the same color as the printing paper, and a correction ribbon formed at the tip of the spoke of the printing wheel, and a correction key for inputting a correction command for the printed characters, a correction ribbon formed at the tip of the spoke of the printing wheel, and a correction key for inputting a correction command for the printed characters; Line-shaped correction type having a height equal to or greater than the character height of the characters to be corrected;
In response to a key input operation of the correction key, while moving the carriage over the character to be corrected, the linear shape formed by the correction type is moved from one end of the correction character to the other end via the correction ribbon. An electronic typewriter characterized by being equipped with a character correction means that continuously prints out characters at minute intervals.