JPH0114432Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an electronic typewriter.

Conventionally, a large number of character elements are arranged around the print wheel, and a print wheel is provided with a stepped portion that allows the printed characters to be viewed directly. In an electronic typewriter that responds to a predetermined printing operation, the printing wheel is moved after each print as a control method that allows the printed characters to be seen directly by rotating the printing wheel to a stepped part in order to check the printed characters. A control method that rotates the wheel to a stepped part, and a control method that executes printing operations sequentially without moving the print wheel to a stepped part during normal printing, and when a print signal from the keyboard does not arrive even after a certain period of time has passed after printing. There is a control method in which the printing wheel is rotated and moved to a stepped portion. Of the two control methods described above, the former control method is very advantageous for beginner typists who have slow key operations and need to check the printed characters after almost every printout, and the latter control method is more advantageous than the former. The printing speed is faster than the control method, and it is advantageous for advanced typists who hardly need to check printed characters.

Therefore, the present invention allows a typist to switch between the two types of control methods mentioned above for checking printed characters by operating a selection switch, and provides an electronic typewriter suitable for all typists from beginners to advanced levels. It is something.

The present invention will be described in detail below with reference to the drawings.
FIG. 1 shows a schematic configuration of an electronic typewriter according to the present invention. In the figure, 1 is a platen on which printing paper is mounted, and 2 is a carriage, which is moved parallel to the platen 1 by a drive motor 3. Reference numeral 4 denotes a printing wheel mounted on the carriage 2, around which a large number of character elements 7 are arranged, and the printing wheel 4 has a notch 4a in which there are no character elements so that the printed characters can be seen directly. 5 is a driving motor for rotationally driving this printing wheel 4, and 6 is a character element 7 on the printing wheel 4 that has reached the printing position.
This is a printing hammer that strikes the platen 1 through an ink ribbon (not shown) and printing paper.

Fig. 2 is a block diagram of an electronic typewriter having such a configuration, and numeral 11 shows a large number of keys and a coded electric signal (hereinafter referred to as a code signal) corresponding to the operated key. With a keyboard consisting of a buffer register for storage, 1
2 is a printing control circuit that controls a predetermined printing operation in response to a code signal from the keyboard 11;
Key signal input from the keyboard 11 is valid only when an input ready signal is output from the print control circuit 12 to the keyboard 11. That is, if a key is operated while the input ready signal is not output, the code signal corresponding to that key is sequentially stored in the buffer register, and when the input ready signal is output from the print control circuit 12, the key is operated. Code signals are sequentially output from the buffer registers. Further, once the buffer register is full, key operations are ignored until a code signal is output from the buffer register to the print control circuit 12. 16 is a selection switch, which has two fixed contacts A, connected to the print wheel control circuit 15, respectively;
The movable contact piece is grounded. Then, when the fixed contact A side of the selection switch 16 is grounded, the print wheel control circuit 15 issues a command to rotate the print wheel 4 after every printing to the position of the notch 4a forming the step, and the fixed contact B side is grounded. When a certain amount of time has elapsed since the printing operation, a rotational movement command is output. More specifically, when a code signal from the keyboard 11 is input, the print control circuit 12 outputs a signal corresponding to the code signal to the print wheel drive circuit 13 and the print hammer drive circuit 14 to execute a predetermined printing operation. Immediately thereafter, a print end signal is output to the print wheel control circuit 15. If the selection switch 16 selects the fixed contact A, the print wheel control circuit 15 receives a print end signal and outputs a signal to the print wheel drive circuit 13 to rotate the print wheel 4 to a position where the printed characters can be seen directly. do. The input ready signal is not output from the print control circuit 12 during the printing operation and while the print wheel 4 is rotationally driven to a position where the printed characters can be directly viewed, and the input ready signal is output after the rotation of the print wheel 4 is completed. Furthermore, when the selection switch 16 selects the fixed contact B side, the print wheel 4 is not rotated to the position where the printed characters can be seen directly after each printing as described above, and the input ready signal is output immediately after printing is completed. , the print control circuit 12 is in a state where it is possible to input a code signal from the keyboard 11. However, if a code signal is not input even after a certain period of time has passed after the end of printing, the print wheel control circuit 15 rotates the print wheel 4 to a position where the printed characters can be seen directly. After the completion, the input ready signal is output again and print control circuit 1
2 is in a state where it is possible to input a code signal.

As described above, in the printing confirmation operation in which the printing wheel is rotated to the step part so that the printed characters can be seen directly, the present invention provides a control method that is performed after each printing, and a control method that is normally performed sequentially and after a certain period of time has passed after printing. By making it possible for typists to switch between two types of control methods using a selection switch, one is a control method that performs a print character confirmation operation when no code signal is input from the keyboard, and the other is a control method that performs a print character confirmation operation when no code signal is input from the keyboard. This is an electronic typewriter that allows you to select the control method.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of an electronic typewriter, and Figure 2 is its block diagram. In the figure, 4 is a printing wheel, 4a is a notch at a specific position, 6 is a printing hammer, 11 is a keyboard, and 12 is a printing control circuit, 1
3 is a print wheel drive circuit, 14 is a print hammer drive circuit, and 16 is a selection switch.

Claims (1)

[Claims for Utility Model Registration] A keyboard that has a large number of keys and outputs coded electrical signals based on the operation of each key, and a large number of character elements arranged around the keyboard, and the printed characters can be viewed directly. a printing wheel provided with a stepped portion for enabling the printing, a printing hammer for striking the character element on the printing wheel, and a printing wheel and the printing hammer in response to an electric signal from the keyboard; An electronic typewriter comprising: a drive circuit for driving and executing a predetermined printing operation; and a control circuit for moving the printing wheel to the stepped portion to make printed characters directly visible, the control circuit comprising: A first control state in which the printing wheel is moved to the stepped portion after every printing regardless of the key operation speed; A second control state in which the printing wheel is moved to the stepped portion when the electric signal from the keyboard does not arrive even after a certain period of time has elapsed; An electronic typewriter characterized by being provided with a manually operable selection switch.