JPS613766A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To permit high-speed printing to be performed without the use of high- performance motors by using a system having the first mode for usual printing action and the second mode for making printing with constant-speed feeding or stopping the printing. CONSTITUTION:A switch 22 is turned on/off by operation of a lever 21, and the first mode for usual printing and the second mode for high-speed printing are switched to each other by a controller. By the first mode, the carriage 15 is actuated and stopped each time one letter is printed, and by the second mode, printing is made while feeding the carriage 15 at a constant speed without stoppage or by stopping the carriage 15 according to the selecting time of types. Since the frequencies of actuation and stoppage of the carriage 15 are reduced in the case of the second mode, power required for the motor to drive the carriage can be reduced, and therefore, higher printing speeds can be set up by even the power of the same motor as in the first mode.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electronic typewriter.

Conventional configurations and their problems In recent years, electronic typewriters have not only functioned as typewriters, but also have built-in memory and function as word processors, and can be connected online to computers and communication devices to serve as terminals. It has become necessary to have functions such as a container, and to be faster.

In electronic typewriters, which print while moving a biased carriage in the printing line direction, the carriage is moved and stopped each time one character is printed. FIG. 1 is a diagram showing the operation. At the same time as the carriage starts moving, the type wheel also rotates and begins selecting type. The carriage is moved in order to maintain the positioning accuracy necessary for erasing printed characters.
The deceleration time is set longer than the acceleration time. When both the carriage and type wheel stop, the print hammer operates to print. After a predetermined period of time has elapsed since the printer began operating, the carriage and type wheel begin operating to print the next character.

However, if the carriage is stopped after each print and the deceleration time is set to be longer than the acceleration time, the motor that drives the carriage will require a large amount of power, making it difficult to use as a word processor or terminal device that requires high speed. If output is required, a very high-performance motor is required, resulting in a significant increase in cost. Further, when such high speed is required, even though erasing is hardly necessary, power is wasted to maintain positioning accuracy, resulting in inefficiency. Furthermore, when printing the same character continuously or when the type selection time is short,
The operating rate of the motor that drives the type wheel is so low that it cannot be used efficiently. Furthermore, designs that meet the printing speed required for word processors and terminal devices have problems such as excessive quality when printing while inputting from a keyboard.

OBJECTS OF THE INVENTION An object of the present invention is to provide an inexpensive electronic typewriter that enables high-speed printing without using a high-performance motor for driving the carriage.

Structure of the Invention The present invention provides a platen for holding printing paper, a carriage capable of moving on a guide along the platen, a carriage driving means for moving the carriage, and a carriage rotatably mounted on the carriage. a printing hammer for hitting the printing paper with selected characters for printing on the printing paper; a motor disposed on the carriage for rotationally driving the printing wheel; and a carriage driving means. the printing mark;
A first mode includes a control means for controlling the motor, and a first mode in which printing is performed by stopping the carriage for each printing, and a first mode in which printing is performed while the carriage is fed at a constant speed without stopping according to a character selection time. In addition, it is configured to have a second mode in which printing is performed while the printer is stopped.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a perspective view showing the main mechanical parts of an electronic typewriter according to an embodiment of the present invention. In Figure 2, 10
is a platen that holds printing paper. Guide rod 1
1.12 is the force F at each end parallel to the platen 10.
It is fixed to the side plates 13 and 14. Guide rod 11
．． A kisser ridge 16 is movably supported on 12. The carriage 16 is moved left and right via a wire 17 by rotation of a pulley 16 fixed to a carriage drive motor (not shown).

The carriage 16 is a type wheel 1 having a number of radially extending spokes each having a type at its tip.
B, a wheel motor 19 that rotates a type wheel 18 to select the type to be printed, and a printing marker 20 that strikes the type onto the printing paper. Guide rod 1
A lever 21 is fixed to one end of the lever 21.
A switch 22, which is turned on and off by a lever 21, is fixed on the side plate 13 near the side plate 13. By operating the Renoku 21, the switch 22 is turned on/off, and upon receiving this signal, a control section (not shown) selects a first mode for normal printing operation and a second mode for high-speed printing. Switch.

In the first mode, as shown in FIG. 1, the carriage 15 starts and stops each time one character is printed, similar to a conventional electronic typewriter. In the second mode, depending on the type selection time, printing is performed while the carriage 16 is not stopped and is fed at a constant speed, or printing is performed while the carriage 15 is stopped.

FIG. 3 is an explanatory diagram illustrating the operation in the second mode. When the type selection time is short, the carriage 16 is sent at a constant speed, and the carriage 16 passes a predetermined position in front of the printing position. At the same time, the operation of the printing hammer 20 is started.

The carriage 16 passes through the printing position as the printing hammer 20 strikes the type against the platen 10.

After a predetermined time t has elapsed from the start of the operation of the printing hammer 20, the type wheel 18 starts rotating to select the type to be printed next. When the selected pitch is larger than a predetermined amount and character selection takes a long time, the carriage 15 stops and waits at the printing position, and after the character selection is completed, the printing printer 20'f is operated.

In the second mode, less power is required for the motor driving the carriage because the carriage 16 is started and stopped less frequently. Therefore, even with the same motor power as in the first mode, the printing speed can be set quickly.

A typical electronic typewriter maintains a distance between the platen 10 and the type. This is so that the printed characters can be confirmed. In the first mode, where input is made from the keyboard, it is necessary to be able to confirm the printed characters, but when outputting as a word processor sensor or terminal device, the printed characters can be confirmed. There is no need to check the characters printed inside, so the second
In this mode, the distance between the platen 10 and the type may be small. When the distance between the platen 10 and the type is reduced, the moving distance of the printing hammer 20 is shortened, so the operation time of the printing hammer 20 is shortened, which is effective in improving the printing speed.

FIG. 4 (IL), (t)) is a side view for explaining the mechanism for moving the carriage 15 back and forth with respect to the platen 10, in which eccentric portions 1.11L are provided at both ends of the guide rod 11. A lever 21 is attached to one side of the eccentric portion 11a. Since the guide rod 11 is supported by the side plates 11 and 12 at the eccentric portion 11a, the guide rod 11
By rotating the carriage 15, the carriage 15 can be moved back and forth. When the distance between the type and the platen 10 changes, the way the spokes of the type wheel 1B bend changes.
Since the angle at which the type hits the platen 10 changes, it is necessary to move the single carriage 16 in the vertical direction as well. By appropriately setting the eccentricity of the eccentric portions 11a at both ends of the guide rod 11 and the rotation angle of the guide rod 110, the carriage 16 can be moved up and down at the same time as the carriage 15 is moved back and forth with respect to the platen 10. Thus, the positional relationship between the type and the platen 10 can be maintained.

FIGS. 6(a) and 6(b) are side views for explaining the operation of the printing hammer 20. FIG. The printing hammer 2o is urged by a spring 23 in a direction opposite to the platen 1o, and one end is in contact with the tip of a lever 24. The lever 24 is rotatably supported by a pin 25,
Armature 26 is fixed. The lever 24 is biased counterclockwise in the figure by a spring 27.

When the solenoid 28 is energized, the armature 26 is attracted and the lever 24 rotates clockwise. Then the print
The hammer 20 is moved in the direction of the platen 1o. Lever 2
4 is stopped from rotating by the stopper 29, but the print hammer 20 continues to move and prints the type onto the platen 10.
[Figure 5(b)]. The printing hammer 20 and lever 24 are returned to the position shown in FIG. 6 (IL) by springs 23 and 27, respectively.

When the print hammer 20 moves away from the lever 24, it receives no energy from the solenoid 28.

Therefore, even if the carriage 15 is brought closer to the platen 10 by the distance by which the printing mark 2o moves away from 0/<-24, there is no change in printing energy, so the printing density does not change. Moreover, since the moving distance of the printing printer 20 is shortened, the operation time of the printing printer 20 is shortened.

FIG. 6 shows an electronic typewriter according to another embodiment of the present invention.
FIG. 2 is a side view showing a part of the mechanism of FIG. Rotation of the gear 29 is restricted by a stopper 33. When the printing mode is switched, a signal is transmitted from the control section (not shown) to the stepping motor 31, which rotates the guide rod 11 and moves the carriage 15 to the platen 1.
Move it in the direction of 0. The stop position of the guide rod 11 is determined by a stopper 33.

As described above, according to the present invention, an electronic typewriter that is equipped with an internal memory and has functions as a word processor, and functions as a terminal when connected online to a computer or a communication device, can be used as an electronic typewriter. - When used by inputting from the keyboard, the carriage positioning accuracy can be ensured to erase printed characters, and when used as a word processor or terminal, high-speed printing is possible without using a high-performance motor. be able to.

Although a disc-shaped type wheel is used in the present invention, the same effect can be achieved even if a cup-shaped type wheel is used. Further, although the carriage provided with the printing mechanism moves along the platen, this is also the case when the printing mechanism is fixed to the main body and the platen moves every time printing is performed.

Effects of the Invention As is clear from the above explanation, the present invention enables high-speed printing by devising the control of the carriage and printing hammer without using a high-performance motor to drive the carriage. We can provide electronic typewriters. Further, as in the present invention, by moving the type closer to the platen, higher speeds can be achieved.

[Brief explanation of drawings]

Fig. 1 is an operation explanatory diagram for explaining the operation of a conventional electronic typewriter, Fig. 2 is a perspective view showing the main mechanical parts of an electronic typewriter according to an embodiment of the present invention, and Fig. 3 is an illustration of the same embodiment. An operation explanatory diagram explaining the operation in the example, FIG. 4(a),
(b) is a side view of the main part of the same embodiment, FIG. 6(a),
(b) is a side view of the mechanism for driving the printing hammer in the same embodiment, and FIG. 6 is a side view of the main parts of the mechanism in another embodiment of the present invention. 10...Platen, 11...Guide rod, 112L...Eccentric shaft, 15...Carriage, 18...Type wheel, 20... Printing hammer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4 1θ Figure 5 Figure 6

Claims (7)

[Claims] (1) A platen that holds printing paper, a carriage that can move on a guide along the platen, a carriage drive means for moving the carriage, and a type wheel rotatably mounted on the carriage. ,
a printing hammer that hits the printing paper with selected characters for printing on the printing paper; a motor that is disposed on the carriage and rotates the printing wheel;
A first mode includes a control means for controlling the carriage driving means, the printing hammer, and the motor, and a first mode in which printing is performed by stopping the carriage for each printing, and a first mode in which printing is performed by stopping the carriage for each printing, and a first mode in which printing is performed without stopping the carriage in accordance with a character selection time. It has a second mode in which printing is performed while feeding at a constant speed or printing while stopped, and printing is performed by selectively switching between the first mode and the second mode. electronic typewriter. (2) The main body has a memory or a connection function with an external device, and when inputting from the keyboard, it prints in the first mode, and the information in the memory and the information on the external device by the connection function. The electronic typewriter according to claim 1, wherein the electronic typewriter prints in the second mode when outputting. (3) The electronic typewriter according to claim (1), further comprising a mechanism for moving the type wheel closer to the platen when printing in the second mode. (4) The electronic typewriter according to claim 3, wherein the carriage is brought closer to the platen by movement of a guide that supports the carriage. (5) A patent characterized in that at least one of the guides has a cylindrical shape and has eccentric parts at both ends, and the carriage is brought closer to the platen by rotation of the guide about the eccentric part. An electronic typewriter according to claim (4). (6) A lever is fixed to one of the eccentric parts of the guide, and detection means is provided for detecting the position of the carriage in conjunction with the movement of the lever.
Electronic typewriter as described in section. (7) The electronic typewriter according to claim (5), further comprising a carriage moving means for rotating the guide in response to a signal from the control section.