JPS58171981A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To obtain an electronic typewriter capable of preventing erroneous printing by providing a function to judge rightness of combinations of marks when a specific mark key is pushed without moving of a printing head and then a letter key is successively pushed. CONSTITUTION:For example, when a specific mark key, e.g., Umlaut mark, etc., without moving of printing head is pushed and then a letter key other than dead key, e.g., ''a'' key, etc., are soon pushed, the dead key mode is released and a reference is made to a specific letter data table where codes data corresponding to desired specific letters are arranged, and rightness of combinations of both marks is judged. In case where the combinations are possible, code data corresponding to specific letter ''a'' are obtained from the specific data table and written in a buffer memory, pattern data corresponding to the code data are sent out to a display control circuit and a printing control circuit, and letters corresponding to the pattern data are displayed and printed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention defines a combination of a special symbol and a character input by operating a special symbol key followed by a character key without moving the print head. , relates to an electronic typewriter capable of selectively printing special characters consisting of correct combinations. □ Prior Art Conventionally, in the above-mentioned electronic typewriters that can print special characters, special symbols such as ゛°' (umlaut) are placed above or below the printing position based on the operation of the special symbol key. After printing, the print head is returned to the above printing position, and based on the character keys that were subsequently operated,
For example, the alphabet "A" is printed at the same printing position.

Special characters consisting of a combination of special symbols and letters ° “8”
For example, if you enter a special symbol such as °°゛°゛ followed by a character such as °“B”, the special character “B”, etc. consisting of an illegal combination of special symbol and character will be printed. It had the drawback of being printed incorrectly without limit.

The same applies even if you enter another special symbol ""' (accentage) after the special symbol °゛°゛°'. had the inconvenience of being printed without limit.

OBJECTS OF THE INVENTION In view of the above-mentioned conventional drawbacks, the object of the present invention is to provide an electronic type that selects special characters consisting of a correct combination based on special symbols and characters input manually, and prevents erroneous printing of special characters. The goal is to provide writers.

1 is a perspective view showing the configuration of the invention, and in the figure, a keyboard 1 includes a number of character keys 2 corresponding to alphabets and a number of numeric keys 3 corresponding to respective numbers.
, a spacer 4 that controls the printing of characters, numbers, etc. independently, and a pack space key 5 that controls the carriage 32 to retreat along the printing line independently of the printing of characters, numbers, etc.
A line feed key 6, which controls the return of the mI writing carriage 32 to the left margin position, and controls the feeding of print paper mounted on a platen 30 (to be described later) in a direction perpendicular to the print line, a large number of character keys 2, and a sequence of numbers. Shift key 7 to select and control uppercase or lowercase letters corresponding to key 3, etc.
and a second shift key 8, which selects and controls special symbols such as °' (umlaut) and "-" (accent silicone flex), which are arranged in correspondence with the letter keys 2 and numeric keys 3, and the left and right keys of the print line. Left margin key 9, right margin key 1o, front 8, left margin key 9, right margin key l for setting the width, respectively.
A margin release key 11 is used to release the left and right margins set by O over one print line, and an arbitrary tab position within the print line is set using the left margin key 9 and right margin key lO. a tab set key 12 for activating the Tough Set key 12; a tab clear key 13 for canceling the tab position set by the Tough Set key 12;
1. A tab key 14 for controlling the movement of the carriage to the tab position set by the tab set key 12; and a paper feed key 15 for feeding the printing paper at predetermined pitches in a direction perpendicular to the printing line; A paper return key 16 for returning paper in a direction perpendicular to the print line, and a pressed il
A repeat key 17 that continuously controls each operation based on the character key 2, number key 3, space key 4, backspace key 5, line feed key 6, paper feed key 15, line and paper return key 16, and the character key 2. Letters, numbers, 64 input by operating the numeric key 3, calculation key 19, etc. to be described later
Arithmetic symbols, etc., and numerical data entered manually are processed according to the arithmetic formula specified by the arithmetic keys 19, and the results of the arithmetic operations are displayed respectively, and the displayed letters, numbers, arithmetic symbols, and arithmetic results are The first mode is for editing processing, the second mode is for printing letters, numbers, arithmetic symbols displayed outside of the above operations, as well as the arithmetic results, etc. on printing paper, and the second mode is for displaying manually entered characters and numeric symbols. At the same time,
A mode changeover switch 18 selects the third mode for printing on printing paper, and when the first mode, foil or second mode is selected by the mode changeover switch 18, the number input by the numeric key 3 is selected. arithmetic keys 19 for selecting each of the four arithmetic expressions for numerical data; an equal key 20 for executing 641 processing according to the arithmetic expressions selected by the arithmetic keys 19; character keys 2, numeric keys 3, arithmetic keys 19;
as well as letters and numbers entered using the equal key 20,
A liquid crystal display device 21 consisting of a predetermined number of digits that displays operation symbols, operation results, etc. in a 5×8 dot matrix, and all letters, numbers, operation symbols, operation results, etc. displayed on the display device 21 are erased. Clear key 22 and the first
or when the second mode is selected, the display device, 2
cursor keys 23 and 24 that move the cursor 21a displayed on the cursor 21a to a desired digit position and blink the characters, etc. at the moved digit position to enable correction;
A delete key 25 for deleting characters, etc. at the digit position corresponding to the cursor 21a moved by the iJ cursor keys 23 and 24, and a delete key 25 for deleting characters, etc. at the digit position corresponding to the cursor 21a moved by the cursor keys 23 and 24, and a deletion key 25 for deleting the character, etc. at the digit position corresponding to the cursor 21a moved by the cursor keys 23 and 24 (? An insert key 26 for shifting the character displayed in the i digit to the earth phase side and adding a character etc. to the digit position corresponding to the cursor 21a, and a line width/y width selection switch 27 for determining the printing line spacing are arranged. has been done.

Note that 7a in the figure is a shift lock key that maintains the selection operation of uppercase letters, and when the shift lock key 7a is pressed, the light emitting diode 28 is made to emit light, indicating that uppercase letters and shift-side characters are selected. indicate.

It also has a self-repeat function that continuously executes the line feed, paper feed, or paper return operation when the line feed key 6, paper feed key 15, or paper return key 16 is continuously pressed.

Further, reference numeral 29 in the figure is a brightness setting dial that adjusts the brightness by varying the voltage applied to each liquid crystal at a display value ff121 and changing the arrangement state of the crystals.

The platen 30 is rotatably supported by a main body frame (not shown), and is equipped with thermal paper 31, which serves as printing paper and has a coloring layer fixed to it that can be colored by heat, and is equipped with a step motor for paper feeding. (not shown), the 1 liter thermal paper 31 is fed in a direction perpendicular to the printed line, and then returned.

The carriage 32 includes a guide rod 33 fixed to the main body frame in line with the printing line, and a swingable rod connected to a link mechanism (none of which are shown).

) is installed so that it can be moved back and forth.

The thermal head 34 is attached to the carriage 32-1-
During the printing operation, the heat-generating layers arranged in large numbers in the direction orthogonal to the print line are selectively heated, and letters, numbers, etc. are printed on the thermal paper 3.1. For example, it is printed in a 5×8 dot matrix format.

(+,, In the figure, 35 is a power switch attached to the main body case, and when the power switch 35 is turned on, the electronic hinoki writer is stored behind the platen 30.\\ Figure 3 shows the buffer memory and This is a low chart showing the display device. First, when the power switch 35 is turned on, the carriage 32
The display device 21 is returned to its home position, and the display device 21
After erasing and initializing (block 40)
, a control circuit 36 consisting of a microcomputer sets flags corresponding to the first to third modes set by the mode changeover switch 17, and also sets a read-only memory (hereinafter referred to as R) based on the set flag.
OM. ) Specify the program corresponding to each mode written in the program memory 37a in 37 (
Block 41).

The control circuit 36 then determines whether or not a key arranged on the keyboard 1 has been pressed. If the key has not been pressed manually, the control circuit 36 continues the mode search described above (block 42).

When a key is pressed manually, the control circuit 36 stores the code data manually input from the keyboard 1 corresponding to each key in a memory with the same number of digits as the display device 21 (such as a random access memory having an L position). The RO is sequentially written into the buffer memory 36a, and pattern data such as letters and numbers are written based on the written coat data.
The pattern data corresponding to the pressed key is accessed from the pattern memory 37b in the M37 and output to the display control circuit 38.

The pattern data corresponding to the pressed key is also retrieved from the pattern memory 37b based on the code data that has been pressed.
When this mode is selected, the print control circuit 39 accesses pattern data from the pattern memory 37b based on the code data written in the buffer memory 36a.
I'm going to appear on J.

The display control circuit 38 converts the input pattern data into
The pattern data written in the buffer memory 38a is sequentially written into the buffer memory 38a, which has a storage device with the same number of digits as the number of digits in the display, while shifting the digit positions. Display value M21 corresponding to
digit position, and based on the pattern data, characters,
Displays numbers, etc. in a 5x8 dot matrix format on a liquid crystal display.

The print control circuit 39 moves the carriage 32 to the print line based on the pattern data manually inputted from the control circuit 36, and selectively causes the heating layer of the thermal head to generate heat to print letters, numbers, etc. on the print paper 31. is printed in a 5×8 dot matrix format (block 43).

Note that the control circuit 3 in the block MC indicated by the broken line in FIG.
6 and ROM 37 are constructed by a one-chip microcomputer.

Next, the operation of each mode will be explained according to FIG. 5 and FIG. 15.

First, when the first cy-mode is selected by the mode changeover switch 18, a flag corresponding to the first mode is set, and the program memory 3 is set based on the flag.
At step 7a, the first address where the program corresponding to the first mode is stored is accessed, and the first mode processing, which will be described later, is executed sequentially according to the program.

When a key is entered manually, the code data corresponding to the key is character key 2, number key 3, space key 4, and calculation key 1.
9, etc., or whether it is function data corresponding to the backspace key 5, line feed key 6, tab key 14, equal key 2o, etc., and - if the function data is other than the above, input is possible. Determine whether the state is the same.

When the manual input is possible, the pattern data accessed in f11 is written in the buffer memory 38a based on the code data written in the buffer memory 36a, and the character key pressed based on the input pattern data is written in the buffer memory 38a. 2, Number key 3, Space key 4, Arithmetic key 19
The corresponding characters, symbols, etc. are displayed on a liquid crystal display in a 5x8 dot matrix format.

After the above display, the data counter is counted up, the number of input data is counted, and it is determined whether the number of input data exceeds the number of digits in the buffer memory 36a, and the number of input data is the number of digits. , the code data shifted out from the buffer memory 36a is stored as print data in the register 36b, and then it is determined whether the code data stored in the register 36b is numerical data.

If the above code data is several pieces of data, after writing the numerical data to the first or second calculation register (not shown), move to the start and input the numerical data sequentially according to the flowchart shown in Fig. 5. Displays characters entered manually based on code data.

In determining the chord data described above, if it is the function data corresponding to the corker tone key 23,
As shown in FIG. 6, at the displayed value M 21 J-, the cursor 21a is made to blink and the mode is switched to the correction IF mode.
Move the cursor 21a one digit till the left (open the upper f positions)
Move to.

Then, the code data corresponding to the key pressed next to the cursor key 23 is written to the digit position of the buffer memory 36a specified by the cursor 21a, and the pattern accessed from the pattern memory 37b based on the code data is written. Data is written to the digit position of the buffer memory 38a.

After the above operation, it is determined whether the cursor 21a is located at the 0th digit of the display device 21, and if the cursor 21a is located at the 0th digit, the correction mode is canceled and the digit f specified by the cursor 21a is The display of characters etc. displayed in the vertical position is changed based on the corrected and inputted pattern data.

When determining the digit position of the L cursor 21a, if the cursor is placed f times other than the 0 digit, the 4 characters etc. displayed at the cursor designated digit position are corrected and the display is changed based on the manually entered pattern data. , the characters etc. displayed on the display device 21 are corrected in sequence.

Further, when the cursor key 24 is pressed, the cursor 21a
After blinking and switching to the correction mode, it is determined whether the cursor 21a on the display device 21 is located at the 0th digit, and if the cursor 21a is located at the 0th digit, the correction mode is canceled.

In the above judgment, if the cursor 21a moves to a digit other than 0, the cursor 21a is shifted down by f positions, and the characters etc. displayed on the display device 21 are displayed based on the code data corrected and input according to the operation described above. Change.

Similar to the above operation, when in correction mode, delete key °-2
When 5 is pressed, the code data and pattern data at the digit position in the buffer memories 36a and 3ga specified by the cursor 21a are erased, and are written in the upper digits from the cursor 21a position in the buffer memories 36a and 38B. After shifting the code data and pattern data to the lower phase open, it is determined whether the cursor 21a is set to the 0 digit in the buffer memory 38a according to the operation that reached #I, and the cursor 21a is moved to the 0 digit. If it is located, the correction mode is canceled, and if it is located at a digit other than 0, the cursor 21a is shifted to the lower digit side and the process moves to the start.

- When in the correction mode as in the operation described in F, insert key 2
When 6 is pressed, the code data and pattern data written in the l two-phase till are shifted by one digit to the upper digit side from the cursor 21a position in the buffer memories 36a and 38a, and the cursor 218 is shifted to the earth phase. Shift to the side and write the code data and pattern data corresponding to the space in the phase (t"l M) in the buffer memories 36a, 38, and a specified by the cursor 21a, and count up the data counter according to the operation described above. After that, the code data corresponding to the space,
and pattern data according to the correction mode using the insert key 26
Subsequently, the code data and pattern data corresponding to the pressed key are rewritten, and processing for inserting characters, etc. is executed.

If the manually entered code data is function data corresponding to the equal key 20, the numerical data written in the first calculation register and the several pieces of data input next and written in the second calculation register are combined. is calculated according to the calculation formula specified by the calculation key 19, and then the content of the first calculation register is rewritten to the first calculation result.

Then, the contents of the second calculation register are rewritten according to the input numerical data, and the first calculation result written in the first calculation register and the number f mountain written in the second calculation register are rewritten. After the data is subjected to f4μ according to the calculation formula specified by the calculation key 19, the contents of the first calculation register are rewritten to the above second calculation result and calculations are performed sequentially.

Then, when the equal key 20 is pressed at the edge of the II (II data), all the code data written in the buffer memory 36a is shifted out, the same calculation as above is performed based on the code data, and then the After writing the calculation result to the third calculation register, the equal sign and the calculation result written to the third calculation register were written to the buffer memory 38a, and the equal sign and the calculation result were displayed on the display device 21. After that, move on to the start.

[: In the arithmetic processing, for example, °“No, 20ABC
8150000x60PC5” (1) As in the formula,
After the above-mentioned several pieces of data ``20'' are written at a glance in the first calculation register, when several pieces of data ``'5oooo°'' are input following character data and space data, the control circuit 36 outputs several pieces of data ``°''. Recognizing that 20″° is numerical data unrelated to the calculation formula, rewrite several contents of the first calculation register to the data ladder '50000°' and write yi formula 5000.
Execute 'fAW processing based on 0x60.

In the first mode, when the backspace key 5, line feed key 6, or tab key 14 is pressed manually, alarm processing is executed as shown in FIGS. 8 and 9.

Next, when the second mode is selected by the mode changeover switch 18, a flag corresponding to the second mode is set, and a program for E for the second mode is stored in the block diagram 37a based on the flag. The first address is accessed, and second mode processing, which will be described later, is executed sequentially according to the program.

When the key is input manually, the code data and pattern data input using the key are written to the buffer memories 36a and 38a according to the flowchart shown in FIG.
After sequentially displaying characters and the like corresponding to the pattern data on the display device 21, it is determined whether the data counter corresponds to the write margin or not, and if the two match, alarm processing is executed.

On the other hand, if the two do not match, after counting up the data counter, the buffer memory 36 is
The pattern data accessed from the pattern memory 37b based on the code data shifted out from a is output to the print control circuit 39 to selectively generate heat in the heat generating layer in the thermal head 34, thereby printing letters, numbers, etc. on the thermal paper 31. Print operation symbols, etc.

In the second mode, when the correction mode is entered and the delete key 25 is pressed manually, data is written to the digit position in the buffer memories 36a and 38a specified by the cursor 21a, as in the first mode described above. After erasing the coded data and pattern data, the buffer memories 36a and 38 are erased according to the flowchart shown in FIG.
The code data and pattern data written to the left of the cursor 21a in a are shifted to the lower digits, and along with this shift, the total II (IIJ) of the data counter is counted down and calculation processing of the data counter is executed. , move to start.

Furthermore, when the insert key 26 is pressed manually in the correction mode, the code data and pattern data written to the left of the cursor 21a in the buffer memories 36a and 38a, as well as the cursor 21a, are As the upper digit is shifted to 1 by one digit, the data counter counts up a total of 12 cents, executes the counting process of the data counter, and moves to the start.

Incidentally, when in the correction mode, the contents of the buffer memories 36a and 38a are rewritten based on the code data and pattern data manually entered after pressing the cursor keys 23 and 24, similar to the operation in the first mode described above. Ru.

In addition, in the second mode, when the equal key 2o is pressed manually after entering the calculation formula, the input Ia value data is input according to the calculation formula specified by the calculation key 19, as in the first mode described above. After the arithmetic processing, the flowchart shown in FIG. 7 is executed and the arithmetic processing is executed.
The number of data written in the data counter shark and the parlor memory 36a are added, the calculation process of the data counter is executed, and the process moves to the start.

When the backspace key 5 is pressed in the second mode, it is determined whether the carriage 3-2 has moved to the left margin position based on the total H(tl) of the data counter as shown in FIG. If the carriage 32 is located beyond the left margin, the carriage 32 is moved backward by one digit along the print line, the data counter is counted down, and the calculation process of the data counter is executed and then started. Move to.

In the second mode, use the newline key 6 or the tab key 1
4 is pressed, it is determined whether the pressed key is the line feed key 6 or the tab key 14, as shown in FIG.

When the line feed 7 key 6 is pressed in the above-mentioned hand foot, the court data written in the buffer memories 36a and 38a,
and all pattern data are shifted out and displayed on display device 2.
After erasing all the characters etc. displayed on the left margin key 9 and outputting the pattern data corresponding to the shifted out code data to the print control circuit 39 to print the characters etc., the carriage 32 is moved to the left margin key 9. and return to the left margin position set by platen 3.
The thermal paper 31 is fed by the line pitch set by the line pitch selection switch 27, the data counter is set to the left margin, calculation processing is executed, and the process moves to the start.

Also, if the tab key 14 is pressed ・Buffer memory 3
The code data and pattern data written in 6a and 38a are shifted in accordance with the tab position, the characters etc. displayed on the display device 21 are changed, and the pattern corresponding to the shifted out code data is changed. After outputting the data to the print control circuit 39 and printing characters, etc., the carriage 3 moves to the tab position set by the tab set key 12.
2, set the data counter to the tab position, execute the calculation process, and move to the start.

Next, when the third mode is selected by the mode changeover switch 18, a flag corresponding to the third mode is set, and based on the flag, 1) the program memory 37a selects a program corresponding to the third mode. The first address where is stored is accessed, and the third mode processing, which will be described later, is executed according to the sequential line program.

When the key is pressed manually, the control 2 circuit 36 counts up the data counter in the same way as the operation in the second mode described above, and then the buffer memory 36 is loaded based on the code data written in the buffer memory 36. The pattern data accessed from the pattern memory 37b is sent to the display control circuit 38 and the print control circuit 3.
9 to display characters, etc. on the display device 21L based on the pattern data, and also to display characters etc. on the thermal paper 31 (
Print two characters, etc.

In the third mode, when the cursor keys 23, 24, delete key 25, insert key 26, line (equal call key 20) are pressed manually, editing processing is performed as shown in FIGS. 6 and 7.
Also, arithmetic processing is prohibited and alarm processing is executed.

When the backspace key is pressed in the third mode, the data counter is calculated in the same way as in the second mode, and then written to the buffer memories 36a and 38a, as shown in FIG. The code data and pattern data are shifted by one digit to the lower digit side, the display device 21 is changed, and the process moves to the start.

In the third mode, use the newline key 6 or the tab key 1
When key 4 is pressed manually, the pattern data written in the buffer memories 36a and 38a is erased, and the display device 21 is erased, similar to the operation in the second mode shown in FIG.
After changing the display, a new move or a tab action is executed, data counter calculation processing is executed, and the process moves to the start.

The calculation process of the data counter described above is based on the number of code data corresponding to the write margin, as shown in FIG.
Based on the number of code data counted by the data counter, it is determined whether or not there is an overflow, and in this determination, if the number of data counters overflows from the write margin, based on the code data that overflows from the write margin. Characters, etc. are displayed blinking on the display device 21 to notify that the blinking characters, etc. are in an overflow state.

On the other hand, if the input code data does not overflow from the write margin in the above determination, the overflow operation is canceled.

Next, various operations associated with switching the mode changeover switch 18 will be explained according to FIG. 11.

When the mode selector switch 18 is switched from the third mode to the second mode, the control circuit 36 sets a flag corresponding to the second mode, and then switches the buffer memories 36a and 38.
All the code data and pattern data written in a are erased, the characters etc. displayed on the display device 21 are changed, and the process moves to the start.

When the mode selector switch 18 is switched from the second mode to the fJSl mote, the control circuit 36 sets a flag corresponding to the first mode, and then the number of code data written in the buffer memory 36a overflows the write margin. If there is an overflow, the pattern memory 37
After accessing the pattern data from b and executing a printing operation based on the pattern data, the data counter is set to the write margin, the overflow code data is written to the buffer memory 36a, and 1. After canceling the blinking display of the characters, etc., displayed on the display device 21 based on the code data, the process moves to the start.

On the other hand, if the number of code data does not overflow from the write margin in the above judgment, after printing the characters etc. corresponding to the code data written in the buffer memory 36a, all the code data written in the buffer memory 36a are printed. Delete it and go to start.

When the mode changeover switch 18 is switched from the first mode to the second mode, the control circuit 36 sets a flag corresponding to the second mode, and then detects that the code data written in the buffer memory 36a overflows from the write margin. If there is an overflow, the overflowing characters are displayed blinking from the light margin, and then it is determined whether the line feed key 6 has been pressed.

When the line feed key 6 is pressed manually in this determination, after displaying characters that do not overflow from the right margin, such as characters that have flown over the bar, on the display device 21, the number of coat data written in the buffer memory 36a and the left margin are displayed. At the same time, the data counter is inputted to complete the calculation process of the data counter, and the process moves to the start.

If there is no overflow in the above-mentioned 91 setting, the printing operation is executed based on the code data written in the buffer memory 36a, and then all the large and small characters etc. are erased on the display device 21, and the process moves to the start.

Also, in the judgment in -1-, if a key other than the line feed key 6 is pressed manually, after executing the alarm process, it is determined whether or not the exit 0 line key 6 has been pressed, and the process is performed according to the operation described in 011. .

When the mode changeover switch 18 is switched from the first mode to the third mode, the M control circuit 36 sets a flag corresponding to the third mode, and then outputs the code written in the buffer memory 36a. It is determined whether or not the data overflows from the write margin, and if it is overflowed, the overflowed characters, etc. are displayed blinking, and then it is determined whether or not the line feed key 6 is pressed manually.

When the line feed key 6 is pressed manually, characters that do not overflow are printed and the line feed operation is executed.

The overflowed code data is written to the buffer memory 36a, a printing operation is executed based on the code data, the number of code data written to the buffer memory 36a is added to the left margin position, and the data is input to the data counter. to perform the data counter calculation process,
Move to start.

If there is no overflow in the above judgment, Ir
+1 After executing the printing operation based on the code data stored in the buffer memory 36'a in the same way as the operation described above,
All the characters etc. displayed on the display device 21 are erased and the process moves to the start.

In addition, if a key other than the line feed key 6 is manually pressed while pressing the hammer, after executing the alarm process in the same manner as the operation described above, it is determined whether or not the line feed key 6 has been pressed again.
Process according to the operations described above.

When the mode switch 18 is switched from the third mode to the first mode, the control circuit 36 sets a flag corresponding to the first mote, and then erases all code data written in the buffer memory 36a. , display device 2
1 Delete the characters displayed above and move to the start.

When the drying switch 18 is switched from the third mode to the second mode, the control circuit 36 sets the flag corresponding to the second mode, and then stores the data in the buffer memory 36a in the same manner as described above. All written code data is erased, and the characters etc. displayed on the display 1f121J: are erased, and the process moves to the start.

Next, in the first to third modes, with the second shift key 8 pressed down, special symbols such as """ (umrah, udo), ""' (accentage), etc. that do not involve movement of the carriage 32 are displayed. When the dead key is pressed, the control circuit 36 operates as shown in Figure W412 and Figure 13.
Determine whether dead key mode is set.

If the dead key mode is not set, the code data corresponding to the pressed dead key is written to the buffer memory 36a, and after setting to the dead key mode that does not involve movement of the carriage 32, the code data is written to the buffer memory 36a. A special symbol °゛-'' is displayed on the display device 21F based on the pattern data corresponding to the loaded coat data.
is displayed and move to the start.

Then, if the dead key corresponding to 1, for example, the special symbol ``゛゛''' is pressed, the buffer memory 36 is first pressed.
The code data corresponding to the special symbol °"°' written in a is rewritten to the code data corresponding to the dead key pressed later, and the code data is displayed on the display AAiI 21 based on the pattern data corresponding to the code data. The special symbol °゛ ° will be displayed longer than the special symbol ゛°″゛ and move to the start.

Refer to the special character data table in which the code data corresponding to the character is arranged, and select the special symbol "°" that was input earlier.
It is determined whether a combination of °°°° and the character "A" input later is possible.

If the combination is possible in the above judgment, the code data corresponding to the special character "°A" is accessed from the special character data table, the code data is written to the buffer memory 36a, and the code data corresponding to the code data is written. The pattern data to be displayed is output to the display control circuit 38 or the print control circuit 39, and characters such as I and C are displayed or printed on the pattern data.

If the key of the special symbol ゛°' is pressed manually, for example, the character "B" other than the put key is pressed, the special symbol ゛°° and the character ° are displayed on the special character data table.
Special character “g” consisting of combination with “B”
After determining that only the combination of the special symbol ゛°°'' and the character "B" is possible because the code data to The corresponding code data is the character ゛°B°
At the same time, the special symbol ``° is a character'' displayed on the display device 21 based on the pattern data corresponding to 1.i; is rewritten to the coat data.
” is displayed for a long time and then moves to the start.

Similarly, for example, the special symbol ゛°′ par ~ ゛° and the letter “N°
' is inputted successively, the special symbol °°~°' that was panned later is given priority in the same way as the above operation, and the special symbol "°~°' is entered with reference to the special character data table.

After determining the combination of the character "M" and the character "N", print or display the special character "M" based on the code data corresponding to the special character "M" accessed from the special character data table in the same way as the above operation. .

In other words, when special symbols are input manually using the key, the last input special symbol is given priority, and the combination of the special symbol and the next input character is determined according to the special character data table. or a special character arranged in the special character data table, display or print the special character; conversely, if the combination does not match the special characters arranged in the special character data table, ignore the special character. At the same time, characters are displayed or printed to prevent erroneous input of special characters.

Next, the automatic power-off function when the line feed key 6, paper feed key 15, or paper return key 16, which is operated in a self-repeat manner, is pressed will be described with reference to FIGS. 14 and 15.

Figure 14 shows the states STO and STI that change depending on the pressed/released state of the key searched for by scanning.When the state is in the STO state, the key is in the open state, and when in the state STI, the key is in the open state. Identifies that a key is in a pressed state.

For example, when the line feed key 6 is pressed, which involves a self-repeat operation, the pressed/released state of the line feed key 6 is fixed at t'11, and if the state is STO, the carriage 33 is returned to the left margin stirrup position. At the same time, the paper feed movement is made 1, and after a predetermined line feed process is executed, a transition is made from the state STO to STI, and the timer counter overflows.

If the line feed key 6 is continuously pressed in the above state, the timer counter is counted up and the number of times the key is scanned is sequentially counted.

When the number of scans reaches a predetermined number M by the timer counter, after resetting the timer counter, the line feed process described above is executed, and the auto power off counter is incremented, so that the auto power off counter reaches a predetermined value. Determine whether the value N has not been reached.

In the above judgment, if the count value of the auto power-off counter has not reached the predetermined value N, the process moves to the start, and the timer counter repeats the above-mentioned changeover operation every time the number of scans reaches the predetermined number (IBM). do.

Then, when the count number of the auto power-off counter reaches a predetermined value N, the control circuit 36 controls the buffer memory 36
1! to the display device 21 while holding the code data and pattern data written in a.38a. The control circuit 36 is cut off through the diode.
When the hold terminal is depressed to LOW, the hold terminal is changed to HIGH and the hold state of the control circuit 36 is released.

In addition, if a key other than a key with a self-repeat operation is pressed, the state is determined, and if the state is STO, the predetermined printing/display operation corresponding to the pressed key is executed, and then the state is changed. Move from STO to STI to z8 and move to start.

In other words, if a self-repeat key, such as the line feed key 6, is pressed consecutively and the operation corresponding to the key reaches a predetermined synonym, the auto power off function will prohibit the operation and turn off the power of the electrically driven device. It is possible to reduce power consumption.

In this embodiment, when manually inputting a special character with a special symbol such as °"° (umlaut), the combination of the special symbol and character is determined, and only the special characters with the correct combination are input manually. This prevents the input of special characters by mistake.

Furthermore, when special symbols are pressed manually, the last manually pressed special symbol is prioritized and the combination of the special symbol and character is determined, which improves the operability as well as the above-mentioned effects.

As described in the detailed description of the invention, the present invention determines the combination of the special symbol corresponding to the operated special symbol key and the character corresponding to the subsequently operated character key based on the special character data table, and determines the combination of the above combination. It is equipped with a control circuit that prints special characters based on data successively generated from the special character data table data in response to This is an electronic typewriter that can prevent printing errors.

Figures 5 to 12 are flowcharts for explaining the functions of the electronic typewriter in each mode, Section 13 is an explanatory diagram showing examples of combinations of special symbols and characters, and Figure 14 is a diagram showing state transitions. Fig. 15 is a flowchart showing the auto power off function, in which 1 is the keyboard, 2 is the letter key, 3 is the number key,
9 is a calculation key as a calculation processing key, 2o is a display device,
23 and 24 are cursor keys as editing processing keys, 25
is also a delete key, 26 is an insert key, 30 is a platen constituting the printing device, 32 is a carriage, 3
4 is a thermal head, and 36 is a control circuit.

'li a4 applicant Brother Industries, Ltd. agent
Patent Attorney IB Ken −

Claims (1)

[Claims] 1. A platen on which printing paper is mounted, a keyboard in which a large number of keys such as a large number of character keys and special symbol keys are arranged, and a character-1 symbol etc. corresponding to the operated key is printed. The electronic typewriter is equipped with a print head that is capable of printing special characters by moving the print head along a print line of printing paper based on a character key operated after the special symbol key. Then, the combination of the special symbol corresponding to the operated special symbol key and the character corresponding to the subsequently operated character key is determined based on the special character data table, and the special character data table data is created corresponding to the above combination. An electronic typewriter comprising a control circuit for printing special characters based on data read from the sm.