JPH0794175B2 - Print correction mechanism of impact printer - Google Patents

Description

The present invention relates to a print correction mechanism in an impact printer such as an electronic typewriter.

<Prior Art> An electronic typewriter will be described below as an example of an impact printer.

The electronic typewriter includes a cage unit and a frame unit that movably supports the cage unit along the platen.

An ink cassette in which a printing ink tape is wound and stored, and a correction adhesive tape are attached to the carriage unit.

Further, the carriage unit is provided with a swinging mechanism for swinging the printing ink tape to the pressing position during the printing operation and the correction adhesive tape to the pressing position during the correction operation. ing. Such a swing mechanism has a cam having a cam curve as shown in FIG. 9, a cam follower that swings by following the rotation of the cam, and a cam motor that rotates the cam. That is, the cam is rotated by an angle corresponding to the printing and correcting operations to swing both tapes to the pressing position. In the case of the printing operation, θ _{1 in} the counterclockwise direction from the home position (hereinafter, the home position means the position of the cam in a state in which neither the printing operation nor the correction operation is performed), in the case of the correction operation Is rotated by θ _{2 in the} clockwise direction.

<Problems to be Solved by the Invention> However, the print correction mechanism of the conventional impact printer described above has the following problems.

That is, in the print correction mechanism of the conventional impact printer, FIG. 10 shows the pressure applied three times (the center position of the type, and the positions slightly deviated to the left and right sides from the center position) in one correction operation.
Characters are removed at the timings of t ₁ , t ₂ , and t ₃ , but from the adhesive tape for correction, it means that the pressure is applied to almost the same position three times (Fig. 11 (a)). reference),
It is difficult to completely remove the characters on the recording paper.

Therefore, in order to solve such a problem, the correction adhesive tape is wound three times at 1/3 pitch of the mechanism described above by one correction, and the characters are completely removed by constantly pressing on a new surface. The mechanism is being implemented. However, in such a mechanism, since the correction adhesive tape 40 has to be wound three times, one correction operation requires at least three times as long as that described above. It should be noted that FIG. 11B shows the correction pressure-sensitive adhesive tape when the correction pressure-sensitive adhesive tape is wound three times at a 1/3 pitch in one correction operation and pressure is applied three times.

The present invention has been devised in view of the above circumstances, and provides a print correction mechanism for an impact printer that can remove characters more completely and the time required to remove characters is the same as that of a conventional printer. It is an object.

<Means for Solving the Problems> The print correction mechanism of the impact printer according to the present invention is selected in accordance with the character to be removed from the correction adhesive tape that has moved to the pressing position between the platen and the printing unit. A printing correction mechanism of an impact printer that performs a correction operation of pressing the printed characters to remove the characters, and a swing mechanism for winding an adhesive tape for winding a correction adhesive tape for one character in one correction operation. , A swinging mechanism for moving the correction adhesive tape to the pressing position during the correction operation and moving the correction adhesive tape in the pressing position in the width direction within the width dimension, The hammer solenoid of the printing unit is configured to press the correction adhesive tape a plurality of times during the movement in the width direction.

<Operation> When the correction key of the keyboard is operated, the character corresponding to the character to be removed moves to the pressing position in front of the hammer solenoid. At the same time, the swinging mechanism moves the correction adhesive tape to the pressing position. Then, the hammer solenoid presses the characters, and the characters on the recording paper are peeled off to the correction adhesive tape. Even during pressing with a hammer solenoid, the correction pressure-sensitive adhesive tape moves within its width. In this case, the printed characters are pressed multiple times by the hammer solenoid. Therefore, the correction pressure-sensitive adhesive tape is like pressing a character on a nearly new surface at all times.

<Example> Hereinafter, an example according to the present invention will be described with reference to the drawings.

FIG. 1 is a graph showing a cam curve of a cam used in a swing mechanism of a print correction mechanism of an impact printer according to an embodiment of the present invention, and FIG. 2 is a timing chart showing a timing of character correction by the cam. FIG. 3 is a schematic perspective view of the carriage unit, FIG. 4 is a rear view showing the relationship between the type wheel and the character selection motor, and FIG. 5 is a side view showing the relationship between the hammer solenoid and the platen. 6 is an explanatory view for explaining the movement of the carriage unit by the swing mechanism, FIG. 7 is an explanatory view for showing the rotation of the cam of the swing mechanism, and FIG. 8 is for correction by the print correction mechanism of this impact printer. It is explanatory drawing which shows the character peeled off by the adhesive tape.

First, before describing the print correction mechanism of the impact printer, the schematic configuration and operation of the electronic typewriter will be described.

The electronic typewriter includes a carriage unit 10 and a frame unit (not shown) that movably supports the carriage unit 10 along the platen 50.

First, the carriage unit 10 will be described with reference to FIG.

The carriage unit 10 includes a carriage base 11 that is movably attached to the frame unit, a printing unit 12 that is attached to the carriage base 11, and a print that is wound around an ink cassette 31 (only a part of which is shown). Tape take-up motor 13 for taking up an ink tape (not shown), an adhesive tape take-up swing mechanism 16 for taking up a correction adhesive tape 40, an ink cassette 31, and an adhesive tape take-up swing mechanism. A swinging mechanism that swings 16 main parts as shown in FIG. 6 according to the printing operation and the correcting operation.
Have 15 and.

The printing ink tape (not shown) taken out from the ink cassette 31 and the correction adhesive tape shown in FIG.
40 is parallel to platen 50. Moreover, this printing ink tape is arranged directly above the correction adhesive tape 40. Therefore, when the swinging mechanism 15 is operated, the printing ink tape and the correction adhesive tape 40 are alternately moved to the pressing position between the platen 50 and the printing unit 12.

The carriage base 11 is formed by bending a metal plate into a predetermined shape. A moving shaft 21 provided inside the frame unit penetrates through the carriage base 11, and the carriage base 11 is movable along the moving shaft 21. There is. Since the moving shaft 21 is installed parallel to the platen 50, the carriage base 11 moves parallel to the platen 50. The carriage base 11 is provided with a support stand 17 that can be rocked by a rocking mechanism 15 to be described later, and the support base 17 has an ink cassette 31 (here, an ink cassette) in which a printing ink tape is wound. 31 is only partially shown in FIG. 3) is detachably attached. The printing ink tape is moved to a pressing position by rocking by a rocking mechanism 15, which will be described later, according to a printing operation character.

The printing unit 12 includes a circular character wheel 121 having a plurality of characters 121a and a character selection motor 12 for rotationally moving a character 121a selected by a keyboard (not shown) to a pressure position.
3 and a hammer solenoid 122 that presses the type 121a at the pressing position, and is attached to the carriage base 11.

The ink tape take-up motor 13 is a roller (not shown) in the ink cassette 31 for printing ink tape taken out from the ink cassette 31 according to the printing operation of the printing unit 12.
It is to be wound up. That is, each time one character is printed, the printing ink tape is wound up by one character,
In preparation for the next printing operation. The swing mechanism 16 for winding the adhesive tape is configured to wind the correction adhesive tape 40 taken out from the reel (not shown) on the reel 41. More specifically, the adhesive tape winding swing mechanism 16 includes an adhesive tape winding drive lever 161, an adhesive tape reverse rotation prevention lever 162, an adhesive tape winding drive lever operation fulcrum shaft 163, and an adhesive tape winding drive gear 164. The adhesive tape take-up drive lever 161, the adhesive tape reverse rotation prevention lever 162, and the adhesive tape take-up drive gear 164 are provided on the holding base 17, and the adhesive tape take-up drive lever operation fulcrum shaft 163 is provided on the carriage base 11, respectively. It is provided. The swinging mechanism 16 for winding the pressure-sensitive adhesive tape is moved by the swinging mechanism 15 described later to move the correction pressure-sensitive adhesive tape 40 to a pressing position during a correction operation, and further returns the pressure-sensitive adhesive tape 40 by one reciprocating operation (= 1 correction operation). By rotating the adhesive tape take-up drive gear 164 by one tooth of the tape take-up drive gear 164 in the direction of the arrow shown in FIG. 6, the correction adhesive tape 40 is taken up by one character.

Further, the swing mechanism 15 includes a cam 151, a cam motor (not shown) for rotating the cam 151, and a groove portion 151 of the cam 151.
and a cam follower 152 having a pin 152a fitted to a. When a key on the keyboard is operated, the cam motor operates, the cam 151 rotates, the tip of the cam follower 152 moves vertically as shown in FIG. 6, and the printing ink tape moves upward together with the correction adhesive tape 40. Move in the direction. When the printing operation is performed, the printing ink tape moves to the pressure position between the platen 50 and the printing unit 12, and when the correction operation is performed, the correction adhesive tape 40 moves between the platen 50 and the printing unit 12. Move to the pressing position between.

The cam 151 has a cam curve as shown in FIG.

The cam curve for the rocking mechanism 15 to rock as described above is shown in FIG. 1, and the rocking amount by the cam 151 and the timing of hammering the hammer solenoid 122 are shown in FIG. 2, respectively.

During the printing operation, the cam 151 rotates θ ₁ ° counterclockwise from the home position to move the printing ink tape or the like to the pressure position. Then, the hammer solenoid 122 presses the type 121a selected at the position to print. This is the same as the conventional one. That is, the cam curve related to the printing operation is set to be the same as the conventional one.

However, the cam curve related to the correction operation is set differently from the conventional one. That is, at the correction position, the pressure is applied three times at the timings of t ₁ , t ₂ , and t ₃ . Therefore, the pressing force by one correction operation is performed in the width direction of the correction adhesive tape 40 as shown in FIG.

During the correction operation, the cam 151 rotates from the home position in the clockwise direction by θ ₃ to θ ₄ ° (where θ ₃ <θ ₂ <θ ₄ ) and the correction adhesive tape 40 is moved to the pressing position. To move. At the same time, the swinging mechanism 16 for winding the adhesive tape winds up the correction adhesive tape 40 for one character. Even when the correction adhesive tape 40 reaches the pressing position by the swing mechanism 15, the moving speed is reduced but the movement is not completed. The subsequent movement after the movement speed decreases is performed within the width dimension of the correction pressure-sensitive adhesive tape 40. That is, after the correction adhesive tape 40 reaches the pressure position, the swing mechanism for the adhesive tape winding motor is used.
Even if 16 does not wind up the correction adhesive tape 40, in other words, even if the cam 151 does not reciprocate further, the correction adhesive tape 40 moves in the width direction within the width dimension, so it is always corrected. It is as if the new surface of the adhesive tape 40 was in the pressing position.

<Effects of the Invention> In the print correction mechanism of the impact printer according to the present invention, the hammer solenoid of the print unit prints the characters a plurality of times during the widthwise movement of the correction adhesive tape at the pressing position by the swinging mechanism. It is configured to press. Therefore,
Since a plurality of times the pressure is applied in the correction operation is the same as when the pressure is always applied by a new correction adhesive tape, it is possible to perform more complete character removal than the conventional one.

[Brief description of drawings]

FIG. 1 is a graph showing a cam curve of a cam used in a swing mechanism of a print correction mechanism of an impact printer according to an embodiment of the present invention, and FIG. 2 is a timing chart showing a timing of character correction by the cam. FIG. 3 is a schematic perspective view of the carriage unit, FIG. 4 is a rear view showing the relationship between the type wheel and the character selection motor, and FIG. 5 is a side view showing the relationship between the hammer solenoid and the platen. 6 is an explanatory view for explaining the movement of the carriage unit by the swing mechanism, FIG. 7 is an explanatory view for showing the rotation of the cam of the swing mechanism, and FIG. 8 is for correction by the print correction mechanism of this impact printer. FIG. 9 is an explanatory view showing characters peeled off from the adhesive tape, FIG. 9 is a graph showing a cam curve of a cam used in a print correcting mechanism of a conventional impact printer, and FIG. 10 is a timing chart for correcting characters by this cam. Timing chart showing a grayed, 11
The figure is an explanatory view showing characters peeled off from the correction adhesive tape by the print correction mechanism of this impact printer. 10 …… Killage unit, 11 …… Carriage base,
12 …… Printing unit, 121 …… Type wheel, 121a ……
Type, 122 …… Hammer solenoid, 123 …… Selection motor,
13 …… Ink tape winding motor, 15 …… Swing mechanism, 151
…… Cam, 16 …… Rolling mechanism for winding adhesive tape, 52 …… Cam follower, 20 …… Frame unit, 40 …… Correction adhesive tape, 50 …… Platen, P …… Recording paper.

Claims (1)

[Claims] Claim: What is claimed is: 1. An impact for performing a correction operation of removing the character by pressing the correction adhesive tape moved to a pressing position between the platen and the printing unit with a type selected corresponding to the character to be removed. In the print correction mechanism of the printer,
An oscillating mechanism for winding an adhesive tape for winding up a correction adhesive tape for one character in one correction operation, and moving the correction adhesive tape to the pressing position during the correction operation, and at the pressing position The correction adhesive tape is provided with a swinging mechanism for moving the correction adhesive tape in the width direction within a limit of the width dimension, and a character is struck by the hammer solenoid of the printing unit a plurality of times during the movement in the width direction. A printing correction mechanism for impact printers characterized by pressing.