JPS6164472A - Electronic typewriter - Google Patents

Abstract

PURPOSE:To perform the initial position setting operation of a type wheel and a carriage, by constituting a wheel stop lever so as to be engaged at a position, where the carriage is forcibly stopped by a carriage stopper, in order to forcibly and mechanically stop the type wheel at the initial position. CONSTITUTION:In such a state that a carriage stopper 17 is not engaged with a wheel stop lever 15, the wheel stop lever 15 is not engaged with the stopper 18 provided to a type wheel 12 while this type wheel 12 is brought to such a state that a type can be freely selected by a wheel motor 13. In such a state that the carriage stopper 17 stops a carriage 8 mechanically and forcibly, the carriage stopper 17 is engaged with the wheel stop lever 15 which is, in turn, engaged with the stopper 18 provided to the type wheel 12 to mechanically and forcibly stop said type wheel 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for initial positioning of a type wheel of an electronic typewriter using a type wheel.

Conventional configurations and their problems In recent years, electronic typewriters using type wheels have become more popular for personal use year by year, and are becoming lighter, thinner, smaller, or portable, with lower power consumption, and lower costs.

Conventionally, as a means of setting the operation start position (i.e., initial position) of the carriage and type wheel, for example, a magnet or a light emitting diode was provided on the surface of the carriage IJ, and on the other hand, a light emitting diode was provided on the main body frame. A detection member such as a Hall IC or a phototransistor is provided to perform so-called optical and magnetic position detection to determine the initial position.

However, with such a conventional method, adjusting the mounting position during manufacturing requires very troublesome and uncertain work. Furthermore, the information detected by these electrical position detection sensors must be processed by the microcomputer one by one, which increases the burden on the microcomputer. In other words, there are problems in that the number of components is large and the power consumption is also large.

OBJECTS OF THE INVENTION The present invention is directed to an electronic typewriter in which printing is performed by moving a carriage equipped with a type wheel, so that the initial positioning of the type wheel and the carriage can be performed accurately and at low cost with a very simple structure. The purpose of this invention is to provide an electronic typewriter with a new design.

Composition of the Invention The electronic typewriter of the present invention includes a carriage stopper that mechanically forcibly stops the carriage at one end of movement position, and a carriage stopper that mechanically forcibly stops the carriage at one end position of the carriage, and a carriage that is forced to stop by the carriage stopper. The wheel stop lever is configured to be engaged in order to mechanically forcibly stop the type wheel at the initial position at the stopped position, thereby performing the initial positioning operation of the carriage and type wheel. This is what I did.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a mechanical configuration diagram of an electronic typewriter in one embodiment of the present invention. A keyboard 2 is arranged at the front of the main body 1, and a mechanism section is arranged at the rear of the main body 1. A platen 4 is rotatably supported on a frame 3, which is the base of the mechanism, and a printing paper 6 is fed by a platen motor 6. A carriage shaft 7 is fixedly supported on the frame 3 in parallel with the platen 4, and holds a carriage 8 slidably in the axial direction. Further, in order to move the carriage 8 to a desired printing position, a carriage motor 9 is fixed to the frame 3.
Similarly, a timing belt 11 is stretched between pulleys 10 fixed to the frame 3. The carriage IJ and the carriage 8 fixed to the timing belt 11 are moved by the carriage motor 9 to a desired printing position via the timing belt 11. Also, a type wheel 12 is mounted on the carriage 8 to move the type. The carriage 8 is rotatably supported for selection.
The desired type is selected by a wheel motor 13 fixed to the holder. Impact printing is then performed by a printing hammer 14 similarly fixed to the carriage 8.

FIG. 2 is a partially enlarged view of the mechanical structure of the carriage section seen from above, showing a state in which the carriage 8 has not yet reached the end of its travel. Further, FIG. 3 shows a state in which the carriage 8 has reached the end of its movement on the left side.

A wheel stop lever 15 is supported on the carriage 8 so as to be rotatable in the direction of the arrow 9, and one end is connected to the carriage 8.
The other end is biased counterclockwise by a spring 16 fixed to the wheel stop lever 15. On the other hand, a carriage stopper 17 is fixed to the frame 3.

In the state shown in FIG. 2, that is, in the state in which the carriage stopper 1a does not engage with the wheel stop lever 16, the wheel stop lever 15 is configured not to engage with the stopper 18 provided on the type wheel 12. The type wheel 12 is connected to the wheel motor 1.
3 allows you to freely select type.

However, in the state shown in FIG. 3, the carriage stopper 17 forcibly stops the carriage 8 mechanically.

At the same time, it engages with the wheel stop lever 15,
Furthermore, the wheel stop lever 16 is connected to the type wheel 12.
The type wheel 1 engages with a stopper 18 provided on the type wheel 1.
2 is forcibly stopped mechanically. Thus, according to this embodiment, when the gear IJ and gear 8 reach the end of leftward movement, the type wheel 12 is forcibly stopped mechanically and the initial positioning operation is completed. Then, in order to perform a normal printing operation, the carriage 8 is moved to the right by the carriage motor 9 by several characters.

Effects of the Invention As is clear from the above description, the electronic typewriter of the present invention has a carriage stopper that mechanically forcibly stops the carriage at one end of the movement, and a carriage stopper on the same side as the carriage stopper. A wheel stop lever is configured inside to mechanically stop the type wheel at the initial position at the position where the carriage is forcibly stopped by the carriage stopper, so it is very simple. With this configuration, an excellent effect can be obtained in that the initial positioning operation of the type wheel and carriage can be realized accurately and at low cost. As a result, it is possible to simplify the mechanical configuration and reduce the number of parts, resulting in excellent effects such as lowering the cost and improving reliability of the entire device.

Furthermore, by making a part of the wheel stop lever elastic, in other words, by making the resin part thinner and configuring it in a shape that gives it elasticity, the protrusion of the type wheel and the wheel stop lever engage with each other. When doing so, it is possible to prevent the butt phenomenon, achieve smooth engagement, and prevent excessive external force from being applied to the wheel stop lever.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an electronic typewriter according to an embodiment of the present invention; Fig. 2 is a top view of the carriage section; Fig. 3 is a top view of the carriage section in a positioning state. 1. ...Body, 2...Keyboard, 3.
...Frame, 4...Platen, 6...
...Platen motor, 6...Print paper, Finish...Carriage 7 axis, 8...Carriage, 9
... Carriage motor, 10 ... Pulley, 11 ... Timing belt, 12 - Old ...
Type wheel, 13...Wheel motor, 14
...Printing hammer, 16. Old wheel stop lever, 16. Spring, 17. Carriage stopper, 18. Stopper. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3

Claims (2)

[Claims] (1) A carriage stopper that mechanically forcibly stops a carriage equipped with a type wheel at one end of its movement; a wheel stop lever configured to be engaged to mechanically forcibly stop the type wheel at a specific rotational position, and configured to perform an initial positioning operation of the type wheel. An electronic typewriter. (2) The electronic typewriter according to claim 1, wherein a part of the wheel stop lever is an elastic body.