JPH01178450A - Recording system for thick line - Google Patents

Abstract

PURPOSE:To record a thick line by means of a low-cost and simple structure, by a system wherein a carriage is moved in a first direction to record marks and characters by a carriage driving system and the carriage is moved in a second direction to record the same marks and characters on the recorded positions of the first marks and characters by the carriage driving system. CONSTITUTION:When printing is made at a prescribed printing position, some slippage occurs in a stop position of a carriage 3 between the case when the carriage 3 is moved in the direction of an arrow A' and stopped for printing and the case when the carriage 3 is moved in the direction of an arrow A and stopped for printing. Accordingly, the carriage 3 is moved in the direction of A' and stopped at the prescribed position, and a hammer 4 is driven to strike the rear of a daisy wheel 5 for printing. When the carriage is returned, thereafter, the carriage 3 is stopped at the position of a character specified to be thick and the same character is struck again thereat for printing. Thereby a thick character can be printed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is capable of printing the same character, etc. multiple times,
This relates to a thick line recording method for recording thick characters and thick lines.

[Prior Art] Conventionally, when printing bold characters in a typewriter or the like that prints by scanning the print head mounted on a carriage in the width direction of the paper, after printing - degree characters, the carriage is moved very small. This is done by moving a distance (approximately 1/240 inch) and printing the same character again.

FIG. 2 is a diagram showing the structure of a printing section of a conventional typewriter. Here, numeral 1 is a platen that winds and holds the recording paper 2. The platen 2 is rotated by a paper feeding means (not shown), and the recording paper 2 is line-fed in the scanning direction of the carriage 3 (a direction perpendicular to the A-A' force direction). and an ink ribbon cassette 6, etc. The carriage 3 moves in the direction of arrow A-A' along the shaft 7, and as the carriage 3 moves, the hammer 4 hits the back of the daisy wheel 5. Printing is performed via the ink ribbon 6a.

The carriage 3 is moved by a stepping motor 8, and a motor pinion 8a that meshes with a gear 9 is provided on the rotating shaft of the motor 8 in order to achieve a resolution of 17,240 inches. A pulley 9a for winding a belt 10 fixed to the carriage 3 is provided at the tip of the gear 9.

With the above configuration, one step feed of the stepping motor 8 is a left and right feed of the carriage 3 (a feed in the A-A' direction).
This corresponds to 1/240 inch. When printing bold characters, first perform normal printing,
Thereafter, the motor 8 is moved by one step in the direction of arrow A' to move the carriage 3 approximately 17,240 inches, and the same character is printed again, thereby making it possible to print an uppercase character.

Figure 3 is a diagram showing an example of printing the characters "rH" in bold letters printed in this way, where the solid line part is the first printing part,
The broken line portion indicates the second printing portion.

[Problems to be Solved by the Invention] However, in the conventional example described above, it is necessary to increase the reduction ratio of the gear in order to achieve a resolution of 17240 inches, which increases the cost of the WAwJ system. Since there is a limit to the maximum driving rotation speed of the motor, there is a problem in that the moving speed of the carriage becomes slow.

The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide a thick line recording method that can realize printing of thick characters without increasing the movement resolution of the carriage.

[Means for Solving the Problems] In order to achieve the above object, the thick line recording method of the present invention has the following configuration. That is, in the thick line printing method, in which a carriage equipped with a recording head is scanned and the same symbol or character is overprinted on the recording paper to record a thick line, the carriage is moved in a first direction and stopped at a predetermined position. a carriage drive system that generates a difference in stopping position when the carriage is moved in a second direction opposite to the first direction and stopped at the predetermined position; means for recording a symbol/character by moving the carriage in the first direction by a system; and means for moving the carriage in the second direction by the carriage drive system to the same recording position as the symbol/character. means for recording symbols and characters.

[Operation] In the above configuration, when the carriage is moved in a first direction and stopped at a predetermined position, and when the carriage is moved in a second direction opposite to the first direction and stopped at a predetermined position. The apparatus has a carriage driven by a carriage drive system that generates a difference in its stop position depending on the time, and the carriage is moved in a first direction by this carriage drive system to record symbols and characters. Thereafter, the carriage is moved in the second direction by the carriage drive system, and the same symbol/character is recorded at the original recording position of the symbol/character.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Description of the printing section (Fig. 1)] Fig. 1 is a diagram showing the structure of the printing section of the typewriter of the embodiment. Parts common to the external view of the conventional example shown in Fig. 2 are indicated by the same symbols, and they are The explanation of is omitted.

In the figure, 8 is a stepping motor for driving the carriage 3 similar to the motor 8 in FIG. 2, which drives a belt 10 fixed to the carriage 3 to move the carriage 3 in the AA' force direction. The rotation of the motor 8 is not decelerated,
A gear 11 is attached to the rotating shaft of the motor 8, and a pulley 12 for winding the belt 10 is attached to the tip of the gear 11. Therefore, the movement resolution of the carriage 3 is not large, for example, about 1/60 inch.

In Fig. 1, when printing at a predetermined printing position, there are two cases: one is to move the carriage 3 in the direction of arrow A' and stop, and the other is to move the carriage 3 in the direction of arrow A' and stop. Then, there will be a slight deviation in the stopping position. This deviation is caused by mechanical hysteresis such as meshing play (backlash) between the belt 10 and pulley 12, elongation of the belt 10, or deviation of the rotor of the motor 8 due to the moving load of the carriage 3, etc.
The deviation is 240 inches (approximately 0.1 nm).

Therefore, normally the carriage 3 is moved in the A' direction to stop the carriage 3 at a predetermined position, and the hammer 4 is driven to hit the back of the daisy wheel 5 to perform printing (capital character designation). When the carriage returns, the carriage 3 is stopped at the character position designated for the uppercase character (the predetermined position) and the same character is struck and printed again, thereby making it possible to print the uppercase character as shown in Fig. 3. can.

[Description of the structure of the typewriter (FIG. 4)] FIG. 4 is a block diagram showing the schematic structure of the typewriter of the embodiment.

In the figure, 41 is a CPLI such as a microprocessor that controls the entire apparatus, and controls printing by inputting character codes and the like from a keyboard 42 according to a control program stored in a ROM 43. , 42 is a keyboard for inputting various commands, character codes, etc., and allows normal printing character input, bold character printing, etc. 44 is used as a work area for the CPU 41,
For example, it includes a line buffer for storing one line of print data. The RAM 44 also stores the character code for which uppercase printing is specified, the printing position of the character, etc., and the CPU 41 prints bold letters based on this information. This is a driver that outputs various control signals such as drive signals and print character designation signals. 46 is a power source that supplies power to the entire device.

The printer unit 47 has a printing unit equipped with a carriage drive system 48 such as the carriage 3 and carriage motor 8 shown in FIG. Performs printing of characters, etc.

[Description of Printing Operation (FIGS. 5 and 6)] FIG. 5 is a flowchart for explaining the printing operation (line/bar/line mode) of the embodiment, and this program is stored in the ROM 43.゛In step S1, it is checked whether a character code is input from the keyboard 42. When a character code is input, the process advances to step S2, and it is checked whether the character is designated as a bold character. If there is no bold character designation, the process advances to step S3, and the character code is stored in the line buffer of the RAM 44. On the other hand, if a bold character is specified, the process advances to step S4, where a code indicating an uppercase character is added to the character code and stored in the line buffer.

In step S5, it is checked whether a print start instruction for one line is input. This is determined when the carriage return key is input from the keyboard 42 or when the line buffer becomes full.

In step S6, one line is printed in the A' direction, and in step S, it is checked whether characters to be printed in uppercase exist in that line. If bold characters exist, step S8
Then, the carriage 3 is moved in the input direction to print uppercase letters. If there are no characters to be printed in bold, only the carriage return is performed in step S9. In this way, one line of line feed is performed in step S10. Then, the process returns to step S1, and the process moves to inputting the next character to be printed.

FIG. 6 is a flowchart of a printing process (character/bar/character printing) in which printing is performed every time one character is input, and this program is stored in the ROM 43.

As in the case of FIG. 5, it is checked in step S20 whether a character key is input from the keyboard 42, and if a character key is input, it is determined in step 521 whether there is an instruction to print bold characters, and step 522 is performed. At step 523, the corresponding code is stored in the line buffer.

In step S24, the characters input in step S20 are printed, and in step S25, when printing for one line is completed or the carriage return key is input, the process advances to step 326.

In step S126, it is determined whether a bold character exists in the line printed in step S24. If a bold character exists, the process advances to step S27, and the carriage 3 is inserted only for characters designated as bold. direction and print again to print bold characters. If there is no bold character, the process proceeds to step 328, where only a carriage return is performed to move the carriage 3 in the A direction, and in step S29, the recording paper 2 is line fed for one line, and the process returns to step S20, where the next print character input process is performed. Proceed to.

In this embodiment, the case of printing bold characters has been described, but the present invention is not limited to this, and it goes without saying that the present invention can also be applied to, for example, printing symbols with thick lines or making ruled lines thick.

Furthermore, although the present embodiment has been described in the case of printing by type, the present invention is not limited thereto, and can of course be applied to printing by wire dots, thermal heads, etc., for example.

As described above, according to this embodiment, the carriage drive system does not require a deceleration mechanism or the like for increasing the resolution of carriage movement, so the structure of the carriage drive IIJ system is simple and low cost.

Furthermore, since there is no mechanism for decelerating the rotation of the carriage motor, there is an effect that the moving speed of the carriage becomes faster.

[Effects of the Invention] As explained above, according to the present invention, there is no need for a special mechanism for increasing the movement accuracy of the carriage, and therefore, there is an effect that thick lines can be recorded at low cost and with a simple structure. be.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the structure of the printing section of the typewriter of the embodiment, Fig. 2 is a diagram showing the structure of the printing section of the conventional typewriter, and Fig. 3 is an example of printing the letters rHJ in capital letters. FIG. 4 is a diagram showing a schematic configuration of the typewriter of the embodiment, and FIGS. 5 and 6 are flowcharts showing the printing process in the typewriter of the embodiment. In the figure, 1... platen, 2... recording paper, 3... carriage, 4... printing hammer, 5... daisy wheel, 6... ink ribbon cassette, 7... shaft , 8... Carriage motor, 9.11... Gear, 10... Belt, 9a, 12"-pulley, 41・C
PU, 42...Keyboard, 43...ROM, 44
...-RAM. 45...driver, 46...power supply, 47...printer section, 48...carriage drive system. Figure 3

Claims (1)

[Claims] In a thick line recording method in which a carriage equipped with a recording head is scanned and the same symbol or character is overprinted on a recording paper to record a thick line, the carriage is moved in a first direction to a predetermined position. a carriage drive system that generates a difference in stop position when the carriage is stopped at the predetermined position and when the carriage is moved in a second direction opposite to the first direction and stopped at the predetermined position; , means for moving the carriage in the first direction by the carriage drive system to record symbols/characters; and means for moving the carriage in the second direction by the carriage drive system to record the symbols/characters. A thick line recording method characterized by comprising means for recording the same symbol or character at a recording position.