JPS60210481A - electronic 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 [Technical Field of the Invention] The present invention relates to an electronic typewriter that can automatically correct 61 printed characters by manually rotating a platen knob to feed paper.

[Problem with the technical background of the invention] After the character data entered manually from the keyboard is stored in the memory formed in the internal storage section, it can be printed out in units of one middle stroke of a word or in units of documents. Some electronic typewriters use the line return key, correction key, position return (
There are some items that can be corrected (cancelled) by key operation of function keys such as , location-h) keys, etc.

On such electronic typewriters, when you want to correct characters that have already been printed several lines in front of you, press the line return key on the keyboard, and the display device displays the one-line sentence stored in the document memory. The text displayed in the screen moves forward one line at a time. At the same time, the number of documents in the document memory is 1.
In response to the movement of going back row by row, the paper feed motor is driven, and the platen connected to the paper feed motor rotates by an angle corresponding to one row. When the character to be corrected is displayed on the display device, the line return key is released, the carriage is set to the corresponding character position, and the correction key is pressed manually. Then, the characters in the document memory specified by the line return key and the carriage position are printed out on printing paper via a correction ribbon using, for example, a print wheel. The corresponding characters are then corrected (cancelled). When the character correction is completed, when the position return key is pressed manually, the rotational position of the platen, the carriage position, and the writing position in the document memory are returned to their original positions.

In the case of an electronic typewriter that is not equipped with a display device, the line return key and carriage can be operated while viewing the text printed on the printing paper set on the platen.

However, as described above, electronic quib writers that automatically correct printed characters by operating keys such as a line return key or a correction key on a keyboard have the following problems. That is, since the rotation speed of the platen that responds to the manual operation of the line return key is slow, for example
Attempting to correct a character that was printed out several lines ago increases the time required for the character to be corrected to reach the print wheel position. There was a problem that the bundling lowered the overall printing speed and also lowered the operability.

Additionally, general typists who are not very proficient in operating electronic typewriters have the inclination to manually turn the platen knob when correcting characters that were printed out more than 10 lines ago. Because there is, I can't help but think about it! ]There was a risk of turning the platen knob without using the row return key.

[Object of the Invention] The present invention has been made based on the above circumstances, and its purpose is to provide a detection means for detecting paper feed due to rotation of the platen knob.
Even if you manually turn the platen knob for correction, the correction key operation from the keyboard will
It is an object of the present invention to provide an electronic typewriter that can automatically correct characters, prevent erroneous operations, and improve the overall printing speed.

[Summary of the Invention] The electronic typewriter of the present invention is provided with a platen rotation detection means for detecting the direction of rotation of the platen and the amount of paper feed due to the rotation in synchronization with the rotation of the platen knob of the platen. Based on the paper feed amount detected by
The printed characters are corrected based on the character data of the detected line.

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

FIG. 1 is a front view showing an electronic typewriter according to an embodiment, and numeral 1 in the figure is a housing. A keyboard 2 is provided on the 5-front of this housing 1, and a platen 4 and a carriage 5 are mounted on the upper part of the housing 1 for transferring printing paper 3 to the printer 1, and characters are printed and output on the printing paper 3. A printing mechanism 6@ is housed.

Further, a display device 7 is attached to the center of the housing 1 for displaying one line of character data manually entered from the board 2.

The keyboard 2 includes alphabet keys 8. In addition to number key 〇, space key 10, line return key 11゜ line return key 12
．． Various function keys such as a correction key 139 and a position return key 14 are set to R1. Furthermore, platen knobs 15 that can be manually rotated are attached to both ends of the platen 4 supported by both side walls of the housing 1. carriage 5
The printing mechanism 6 mounted on the print wheel 16. has a print wheel 16. The printing ribbon 170 is composed of a white correction ribbon (not shown), a hammer solenoid 18 for hitting the printed characters on the printing wheel 16, and the like.

FIG. 2 is a block diagram showing the main parts of an electronic typewriter, and numeral 21 in the figure is a CPU (central processing unit) that executes various arithmetic operations. This CPLJ21 is connected to the data bus 22. Address bus 23 and control ll line 2
4, which stores fixed data such as the control program and the rotational position of the print wheel 16 corresponding to each character code.
OM25. It controls a RAM 27 that temporarily stores variable data such as a print command one-character code inputted from the keyboard 2 via the keyboard circuit 26. Also, a keyboard circuit 26, a paper feed motor control circuit 29 that controls a paper feed motor 28 for rotating the platen 4 on which the printing paper 3 is loaded. Print wheel 1 mounted on carriage 5
6 wheel motor drive circuit 30. Ribbon motor drive circuit 31 for the ribbon feed motor for the printing ribbon 17 and correction ribbon; Carriage motor drive circuit 34 for the carriage motor 33 that controls the movement of the carriage 5 attached to the rotating belt 32. A rotation detection circuit 35 for detecting the direction of rotation of the platen 4 and the paper feed peak of the printing paper 3 due to the rotation is connected to the CPtJ 21 via a data bus 22 and a control line 24.

A disk 37 for detecting rotational position is attached to the shaft 36 of the platen 4, and a phototube 38 connected to the rotation detection circuit 35 is installed so as to sandwich the disk 37.

As shown in FIG. 3(a), the disk 37 has a plurality of small through holes 39 cut in three rows A, B, and C along the circumferential direction. The engraving phase positions on the circumference are slightly different for each A, B, and C row. A phototube 3 consisting of three pairs of light emitting diodes 40, an onipifu 41 and a transistor 41 as shown in FIG.
8 are arranged as described above. Therefore, each time the disk 37 rotates and each through hole 39 crosses the phototube 38, a pulse is input to the rotation detection circuit 35. During key manual operation, the through holes 39 in the A row are stopped so as to face the phototube 38, and when the next through hole 39 in the A row comes to the phototube 38 position, the platen 4 is placed on the printing paper 3. 1
This means that the line has been rotated.

In the RAM 27, as shown in FIG. 4, alphabet keys 8. In addition to the document memory RA1 that stores character data entered manually through key operations such as the numeric keys 9, there is also a paper memory RA1 that indicates the rotation direction when the platen 4 is manually rotated using the platen knob 15, that is, the paper feeding direction. Feed direction flag (D.

FLAG) storage area RA2. Similarly, the number of paper feed lines (RFC) when the platen knob 15 is manually rotated.
A paper feed number counter RA3 is formed to measure the number of paper feeds.

As mentioned above, during the manual operation of inputting character data from the keyboard 2, the through holes 39 in the A row of the disk 37 are connected to the photocell 3.
It is facing 8. In this state, the CPU 21
When the typist manually rotates the platen knob 15 in order to correct (cancel) the printed characters a few lines earlier on the printing paper 3, the printed characters are corrected according to the flowchart in Figure 5. The configuration is configured to perform corrective processing for.

That is, when a pulse that detects the through holes 39 is input from the rotation detection circuit 35 connected to the phototube 38 at Pl, it is determined whether the pulse input at P2 enters the eight rows of through holes 39 or not. Find out. If the pulse is in the 8th column of through holes 39, it is determined that the platen 4 has been rotated in the positive direction, that is, in the direction in which the row is returned, and the next pulse is input at P3. The next pulse is input (confirm that the -C input pulse to P4 is from the through hole 39 in the 0th row,
Furthermore, it waits for the next pulse input. When the next pulse is input, it is checked in P5 whether or not the input pulse is due to the through holes 39 in the A row. If the pulse is generated by the through hole 39 in column A, it is determined that the platen 4 has been returned by one line, and the number of paper feed lines RFC in the paper feed number counter RA3 in the RAM 27 is increased by one. After that, it is checked in P6 whether the correction key 13 of the keyboard 2 has been pressed, and if it has not been pressed, it is determined that the line to which the character to be corrected belongs has not been reached yet, and the process returns to P1 and the next pulse input is performed. have Note that if the input pulse is not in the 0 column at P4,
It is determined that the paper has been returned to the through hole 39 in column A (10-), and the process directly proceeds to P6 without increasing the paper feed row number RFC of the paper feed number counter RA3. Further, at P5, it is determined that if it is not the A column, it is returned to the B column, and the process returns to P3 to have the next pulse input.

If there is key input from the correction key 13 at P6, the platen 4 reaches the line to which the character to be corrected belongs, and the carriage 5
It is determined that the character has reached the corresponding correction character position, and the polarity of the paper feed line number RFC of the paper feed number counter RA3 is checked in P7.

If RFC>O, it is determined that the platen 4 has been returned, and the paper feed flag (D
, FLAG) to 1. In this state, the number of paper feed lines RFC and the paper feed direction flag (D, FLAG
) The character data to be corrected in the text memory RAl is specified from the value. Then print wheel 16. The correction ribbon, hammer solenoid 18, etc. are driven to correct the corresponding character, and this correction processing routine is completed. The operation of returning the platen 4 to its original position after the correction is completed may be a manual rotation operation of the platen knob 15 or a manual operation of the keyboard 2 @return key 14. When the platen 4 returns to its original position, the paper feed line number RFC of the paper feed number counter RA3 is cleared to O.

On the other hand, if the pulse inputted from the rotation detection circuit 35 at P2 does not come from the through holes 39 in the B row, it means that the pulses come from the through holes 39 in the 0 row, and the platen 4 is in the negative direction.
Then, it is determined that the row has been rotated in the direction in which it advances, and the next pulse is input at P8. -UB to P9 and Plo
When a pulse is detected in the through hole 39 of the column A, it is determined that the platen 4 has been rotated by one line in the line feeding direction, and the paper feed line number RFC of the paper feed number counter RA3 is set to 1.
decrease only. Thereafter, in P6, it is checked whether or not the correction key 13 is operated manually.

If the paper feed line number RFC of the paper feed number counter RA3 is a negative value at P7, it is determined that the platen 4 has been line fed, and the paper feed direction flag (D) of the area RA2 is determined.

FLAG) is set to 0.

Further, in the electronic typewriter of the embodiment, similarly to the conventional electronic typewriter described above, when correcting characters that have been printed out several lines before, the keyboard 2 is corrected without manually turning the platen knob 15. It is also possible to automatically correct characters that have already been printed out by rotating the platen 4 using the line return key 11.

For an electronic typewriter configured in this way, 1
When correcting characters that were printed out several lines ago,
Tybis! - manually turn the platen knob 15 to move the line to which the correction character belongs to the printing line of the printing mechanism 6,
Even when displayed on the display device 7, the RA
The corresponding line of character data in the text memory RAI of M27 is detected accurately. As a result, the corresponding character can be automatically corrected simply by pressing the correction key 13.

In this way, manual operation of the platen knob 15 and correction key 13
Manual operation of keys, or line return key 11 or correction key 13
By any of the key operation methods, it is possible to automatically correct characters that have already been printed out several lines ago. Therefore, when correcting text 13- characters in a nearby line, the platen 4 is returned by operating the line return key 11, and when correcting characters on the previous line by ten or more lines, the platen 4 is moved back using the platen knob 15. By manually returning the characters, the time required for character correction can be shortened and the overall printing speed of the electronic typewriter can be improved.

In addition, typists have traditionally used the platen knob 1.
Even if 5 is rotated, there is no possibility of an erroneous operation. Therefore, the electronic typewriter becomes easy to use even for typists.

Note that the present invention is not limited to the embodiments described above. In the embodiment, the platen rotation detection means is a disk 3 in which a plurality of through holes 39 are carved in the shaft 36 of the platen 40.
7 and a phototube 38 for detecting the through hole 39,
An electromagnetic pickup may be attached to a gear or the like that connects the paper feed motor 28 and the shaft 36 of the platen 4.

Furthermore, to simplify the explanation, the arrangement pitch of each through hole 39 carved in the circle 1837 is set so that the platen 4 rotates by one row when moving from column A to the next column A. Although it is set, it may be set so that the half-stroke valve rotates.

[Effects of the Invention] As explained above, according to the present invention, even if the platen is manually rotated in synchronization with the rotation of the platen knob of the platen in order to apply the rotation direction and rotation pressure, the rotation detecting means detects the information in the document memory. The line to which the corrected character belongs can be specified, and the corresponding character can be automatically corrected by operating the correction key, similar to conventional electronic typewriters. Therefore, when correcting characters from more than 10 lines in advance, by manually returning the platen, the character correction work time can be shortened and the overall printing speed can be improved. Furthermore, the probability of erroneous operation occurring can be suppressed, and operability can be improved.

[Brief explanation of drawings]

The figures show an electronic typewriter according to an embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a block diagram, Fig. 3(a) is a perspective view showing a disk, and Fig. 3(a) is a perspective view showing a disk. FIG. 4B is a circuit diagram of the phototube, FIG. 2... Keyboard, 3... Print paper, 4... Platen, 5... Carriage, 6... Printing mechanism, 7...
・Display device, 8...alphabetic characters 1-111...1
1 return 4--113...correction key, 14...1 position return 4-115...platen knob, 16...print wheel, 21...CPU, 27...RAM, 2B.
・Paper feed motor, 33...4 Niaritsuji motor, 3
5... Rotation detection circuit, 36... Axis, 37... Disc, 38... Phototube, 39... Through hole, RAl...
Text memory, RA2...area, RA3...paper feed number counter. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] The character data entered manually from the keyboard is temporarily stored in the document memory formed in the storage unit, and is printed out on the printing paper set on the platen. At the same time, the characters that have already been printed out on multiple lines can also be retrieved using the line return key on the keyboard. and an electronic typewriter capable of automatic correction using the document memory by key operation of a correction key, the platen rotation detection detecting the direction of rotation of the platen and the amount of paper feed due to the rotation in synchronization with the rotation of the platen knob of the platen. a line detecting means for detecting a line to which character data to be corrected in the document memory belongs based on the paper feed amount detected by the platen rotation detecting means; An electronic typewriter 8 characterized in that it is equipped with a correction means for correcting printed characters based on the character data in the line detected by the detection means.