JPS62242568A - Typewriter ensuring easy manual correction - Google Patents

Abstract

PURPOSE:To ensure easy manual correction of a plurality of characters, by providing a controlling means which so functions that each time a character key is operated under the condition where a switching operating means is switched to a correction mode, a correcting mechanism is caused to correct a character corresponding to the operated character key, and then the mechanism is moved for a one-character space in a predetermined direction. CONSTITUTION:When a character with which an error is found is such a one that character data corresponding thereto has been deleted from a correction memory 122, a hammer 24 is opposed to the character to be corrected. A slide switch 56 is operated to the correction side. Then, a character key 40 corresponding to the character to be corrected is operated, whereby correction is effected. Thereafter, a correction ribbon is shifted down, and is taken up by a one- character amount. Then, execution of a program is restarted immediately where the operated character key 40 is a dead key. Where the operated character key 40 is not a dead key, the execution of the program is restarted after moving a carriage by one pitch to the right.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a typewriter in which it is easy to manually erase characters such as letters and symbols printed on printing paper.

BACKGROUND OF THE INVENTION Typewriters that are capable of erasing characters printed on paper are already known. This type of typewriter (
a) a keyboard with a large number of character keys and function keys; (b) a printing mechanism for printing characters on printing paper; (0) an erasing mechanism for erasing the printed characters; and (d) from the keyboard. and a control means for controlling the printing mechanism and the erasing mechanism based on the input data to cause them to perform printing and erasing, respectively. If the typewriter prints in type, the erasing mechanism moves the erasing ribbon instead of the printing ribbon to the active position, and causes the type of the printing mechanism to collide with the printing paper through the erasing ribbon. Erasing is usually done by attaching the ink on the paper to an erasing ribbon to remove it, or by attaching erasing ink to the printed characters.
In addition, if the typewriter uses a writing instrument such as a ballpoint pen, an erasing pen may be moved to the active position instead of the printing pen, and the characters printed on the printing paper may be traced by the erasing pen. is often considered to be erased by

Further, the form of this erasing is roughly divided into automatic erasing and manual erasing. With automatic erasure, the character data corresponding to the characters printed on the printing paper is stored in the data memory, and when automatic erasure is commanded, the character data is automatically read out from the data memory. Alternatively, one line of characters is automatically deleted. According to this, it is possible to easily erase a desired amount of characters, but the capacity of data memory is usually limited to a certain amount due to cost considerations, and therefore, characters exceeding that capacity can be erased easily. is printed, it is unavoidable that old character data is sequentially erased every time new character data is stored, and a character whose character data has been erased can no longer be automatically erased.

On the other hand, manual erasing is a form of erasing characters one by one by moving the erasing mechanism to the position corresponding to the character to be erased and operating the character key corresponding to that character. It can also be erased.

Problems to be Solved by the Invention However, in order to manually erase multiple characters on a conventional typewriter, it is necessary to switch the typewriter to a state in which the erasing mechanism operates instead of the printing mechanism by operating an erasing key or the like. After that, operate the desired character key to erase one character, then operate the space key or backspace key to move the erase mechanism by one character, and repeat the operation of the erase key and character key again. However, there was a problem in that it was troublesome and the efficiency of typing work was reduced.

Means for Solving the Problem In order to solve this problem, the present invention provides a typewriter equipped with the above-mentioned (al keyboard), (b) printing mechanism, (C) erasing mechanism, and (d) control means. A switching operation means is provided which is operated to switch between the printing mode and the erasure mode, and the control means is configured to cause the erasure mechanism to operate the control means each time a character key is operated while the switching operation means is switched to the erasure mode. After performing the erasing operation of the character corresponding to the selected character key, the erasing mechanism is moved in a predetermined direction by a distance corresponding to one character.

Functions and Effects In the typewriter configured as described above, when the switching operation means is switched to the erasing mode, the erasing mechanism moves by one character in a predetermined direction simply by sequentially operating any character keys. erase operation while
If the predetermined moving direction is the same as the printing direction,
After moving the erasing mechanism to the position of the first character of the character group to be erased, a predetermined group of characters can be erased simply by sequentially operating the character keys corresponding to each printed character. Furthermore, if the predetermined direction is opposite to the printing direction, the erasing mechanism may be moved to the position of the last character in the group of characters to be erased, and the character keys may be sequentially operated.

In either case, manual erasing of multiple characters becomes easier than before, and the efficiency of typing work is improved. However, in particular, when erasing, the direction of movement of the erasing mechanism is the same as the printing direction. In some cases, it is sufficient to operate the character keys in the same order as when printing, making the key operations easy and controlling the erasing mechanism similar to controlling the printing mechanism, which simplifies the configuration of the control means. The effect of cost reduction can also be obtained.

Embodiment FIG. 3 is a diagram showing the appearance of a typewriter that is an embodiment of the present invention. This typewriter is equipped with a keyboard 12 equipped with a large number of keys at the front of a case 1O, and a printing mechanism at the rear. 14 and an erasing mechanism 16.

The printing mechanism 14 includes a platen 20. The type wheel 22 includes a type wheel 22, a hammer 24, a print ribbon vibrator 26, etc., and after one of the types carried at the tips of a number of radial arms of the type wheel 22 is stopped at the position of the hammer 24 by rotation of the type wheel 22. , the hammer 24 operates,
A predetermined character is printed on a printing paper 30 supported by a platen 20 via a printing ribbon 28 raised to a printing height by a printing ribbon bi-break 26. Type wheel 22. The hammer 24, printing ribbon bi-break 26, etc. are supported by a carriage (not shown), and the printing position in the left and right direction of the printing paper 30 can be changed by moving the carriage along the platen 20. Further, the rotation of the platen 20 causes the printing paper 30 to be sent in the vertical direction, thereby changing the printing position in the vertical direction.

The erasing mechanism 16 includes an erasing ribbon vibrator that raises an erasing ribbon (not shown) to the printing height in place of the print ribbon 28. This erasing ribbon vibrator is a component of the printing mechanism 14, which is the platen 20. Type wheel 22. Together with the hammer 24 and the like, it constitutes an erasing mechanism.

The keyboard 12 includes character keys 40 for inputting alphabets, numbers, and various symbols, and a space key 42 . Backspace key 43, line feed key 44.
Paper feed key 46.4B.

Word erase key 50. Stop key 52. Function keys such as a repeat key 54 are provided, and a slide switch 56 for switching the keyboard 12 between a print mode and an erase mode is also provided.

The control device of this typewriter is shown in FIG. 4, and the main body of the control device is the CPU 64. This is a microcombiator 72 consisting of a RAM 66, a ROM 68, and a bus 70, to which the keyboard 12 is connected as an input device.

The microcomputer 72 further includes a type wheel control circuit 80 . Hammer control circuit 82. Carriage control circuit 8
49 Paper feed control circuit 86. Print ribbon feed control circuit 88
．． Type wheel drive motor 1GG via print ribbon lift control circuit 90 and erase ribbon lift control circuit 92, respectively.

Hammer drive solenoid 102. Carriage drive motor 1
04. Platen drive motor 106. Print ribbon feeding motor 108. A print ribbon lift solenoid 110 and an erase ribbon lift solenoid 112 are connected. The type wheel drive motor 100 drives the type wheel 22.
is rotated to position a predetermined type at the position of the hammer 24, that is, the operating position, and the hammer drive solenoid 102 is used to operate the hammer 24.

The carriage drive motor 104 moves the carriage in both forward and reverse directions via a gear train, a timing pulley, etc. (not shown), and the platen drive motor 106 moves the carriage in both forward and reverse directions through a gear train, a timing pulley, etc.
It rotates in both forward and reverse directions. The print ribbon feed motor 108 is a drive source for a print ribbon feed mechanism that feeds the print ribbon 28 by an amount corresponding to the number of printed characters, and the print ribbon lift solenoid 110 is a drive source for the print ribbon bi-break 26. .

Also, the erase ribbon lift solenoid 112 is a drive source for an erase ribbon vibrator that raises the erase ribbon to the printing height.
It also serves as That is, each time the erasing ribbon is raised to the printing height position, the erasing ribbon feeding mechanism is operated in conjunction with the vertical movement of the erasing ribbon and the printing plater.
The erase ribbon is fed one character at a time.

The RAM 66 is provided with a key buffer 120 that stores key data input from the keyboard 12. The key data input from the keyboard 12 is stored after the data already stored in the keypad sofa 120, and is sequentially supplied to the CPU 64 from the first data in response to a request from the CPU 64. The RAM 66 is further provided with a collection memory 122 that stores the data of printed 1 (H2N characters).
The OM6B is provided with a program memory 130 that stores control programs for controlling the entire typewriter, including the programs shown in the flowcharts of FIGS. 1 and 2.

The operation of this typewriter will be explained below with reference to the flowcharts of FIGS. 1 and 2.

At the same time as the power is turned on, initial settings of step Sl (hereinafter simply referred to as Sl; the same applies to other steps) are performed. Thereafter, the key manual processing shown in FIG. 2 is repeatedly performed at predetermined minute intervals using interval interrupts. At this time, if any key on the keyboard 12 is not operated, 5
The judgment result of tot becomes NO and the key manual processing ends without producing any effect, but if it has been operated, the judgment result of 3101 becomes YES and 3
102 is executed, and key data corresponding to the key being operated is stored in the key buffer 120.

On the other hand, in the main routine, S2 is executed following S1, and key data is read out from the key buffer 120 in the order of being stored first. Then, in S3, it is determined whether the read key data is character data or not, and if the determination result is No, other processing is performed in S4, but if YES
If so, selection of printed characters is performed in S5. The type wheel 22 is rotated to position the type corresponding to the character data read from the key buffer 120 into the active position.

Next, at 86, it is determined whether the slide switch 56 is operated to the side that sets the keyboard 12 to the erase mode (hereinafter simply referred to as the erase side). If the determination result is NO, the hammer 24 is operated in S7 and a predetermined character is printed on the printing paper 30, and then, in S8, character data corresponding to the printed character is stored in the collection memory 122. . Subsequently, in S9, it is determined whether the character data corresponds to a dead key,
If the result of the determination is YES, the program execution returns directly to S2, but if the result of the determination is NOl, that is, it does not correspond to a dead key, the carriage is moved one pitch to the right in 510, and then the program continues. The execution returns to 82.

By repeating the above steps, after a predetermined amount of characters are printed on the printing paper 30, if it is discovered that there is an error in a part of the characters, the erroneous character is erased by automatic erasure or manual erasure. 1 just printed
If an error is found in the characters for a word, the word erase key 50 is operated, and automatic erasure is performed in S4 accordingly. Collection memory 122
The character data is sequentially read out, and based on the data, the erasing mechanism 16 is automatically operated to erase one word of characters.

On the other hand, if the character data corresponding to the character in which an error has been found has already been deleted from the collection memo I7122, the carriage is moved by operating the backspace key 43 or the space key 42, and the paper feed By rotating the platen 20 by operating the keys 46 and 48, the hammer 24 is brought into a state facing the character to be erased. Further, the slide switch 56 is operated to the erasing side. Then, the character key 40 corresponding to the character to be erased is operated, and the key data is temporarily stored in the key buffer 120 in response to the operation, and further read out in S2, and the determination result in S3 is YES.
Then, in S5, the printed character corresponding to the character key 40 is positioned at the active position. S performed after that
Since the determination result in step 6 is YES, the collection ribbon is raised to the operating position at SIT, and the hammer 24 is operated at S1.2 to perform erasing. In this embodiment, this erasing is performed by striking three times. That is, the carriage is stopped three times at three positions: the normal position and a position slightly off on either side of the normal position, and each time the carriage is stopped, the hammer 24 is activated, so that the printed characters corresponding to the characters to be erased are The eraser is shifted by a distance and collides with the printing paper 30 three times via the eraser ribbon, thereby achieving complete erasure.

After that, in S13, the collection ribbon is lowered and wound up by ■characters, and S9 is executed.
If the operated character key 40 is a dead key, the carriage is moved one pitch to the right in step S10, and then program execution returns to step 82.

Therefore, if the character key 40 corresponding to the character to be erased is subsequently operated, the same operation as above is repeated and that character is erased. below,
Similarly, by operating only the character key 40, a plurality of characters will be sequentially erased.

As is clear from the above description, in this embodiment, the slide switch 56 constitutes a switching operation means for switching between the printing mode and the erasing mode, and stores the program shown in the flowchart of FIG. The program memory 130, the CPU 64 that executes it, and each control circuit including the type wheel control circuit 80 constitute a control means.

Further, the control program in the above embodiment may be partially changed as shown in FIG. 5, and the direction of movement of the carriage after manual erasure may be configured to be opposite to the direction of movement during normal printing. .

In other words, this second embodiment is similar to the first example for 31-313.
The program is similar to the program shown in the figure, and after S13 ends, it is determined in 514 whether or not the character key 40 operated in S3 corresponds to a dead key, and if the result of the determination is YES, the Progera J1 is The execution returns to step 82, but if the result of the determination is NO1, that is, it does not correspond to a dead key, the carriage is moved one pitch to the left in step S15, and then returns to step S2.

Therefore, the carrierage is on the upper side (
The character key 40 to be operated next can be immediately determined by moving the hammer 24 to a position opposite to the character to be erased next.

When manually erasing characters continuously, in the first embodiment, erasing may be started after moving the carriage to the position of the first character of the character key to be continuously erased; In this example, erasing may be started after the carriage has been moved to the position of the last character in the group of characters to be continuously erased.

The embodiment described in detail above is literally an example, and the switching operation means is configured such that the key to be pressed and the stored contents correspond to the print mode and the erase mode each time the key is operated. It shall consist of a mode register that changes alternately to the corresponding one, and a display means for displaying the switched mode, or each mechanical part, electrical control part, control program, etc. of the typewriter shall be provided with the knowledge of a person skilled in the art. Based on the above, the present invention can be implemented in various forms with various modifications and improvements.

[Brief explanation of drawings]

FIGS. 1 and 2 are flowcharts showing only portions deeply related to the present invention out of a control program stored in a program memory of a typewriter which is an embodiment of the present invention. FIG. 3 is a perspective view showing the appearance of the typewriter, FIG. 4 is a block diagram showing its electrical control section, and FIG. 5 is a flowchart of a program according to another embodiment of the present invention. be. 12: Keyboard 14: Printing mechanism 16: Erasing mechanism 56: Slide switch

Claims (1)

[Scope of Claims] A keyboard equipped with a large number of character keys and function keys, a printing mechanism for printing characters on printing paper, an erasing mechanism for erasing the printed characters, based on input data from the keyboard. In the typewriter, the typewriter is provided with a control means for controlling the printing mechanism and the erasing mechanism to perform printing and erasing, respectively, wherein the keyboard is provided with a switching operation means operated to switch between the printing mode and the erasing mode; , after causing the control means to cause the erasure model to perform an operation of erasing the character corresponding to the operated character key each time the character key is operated while the switching operation means is switched to the erasure mode; A typewriter that can be easily manually erased, characterized in that the erasing mechanism is moved by a distance of one character in a predetermined direction.