KR950006824B1 - Back tap control method in electronic typewriter - Google Patents

Abstract

The method is characterized by that; after setting a tap function by setting a tap site data in the electronic typewriter, a back-tap function is selected and the tap site data is read from the last number of a tap buffer storing the tap site data; where if the current carriage site data is smaller than the tap site data, the tap site data are consequentially read decreasing the address of the tap buffer to the first number, and if the current carriage site data is larger than the tap site data, the carriage is back-tapped to a decreased site by read tap site in the current carriage site.

Description

Back-step control method of electronic typewriter

1 is a block diagram of a control system of an electronic typewriter having a back-tap function according to the present invention.

2 is a flowchart illustrating a back-step control operation of an electronic typewriter according to the present invention.

* Explanation of symbols for main parts of the drawings

1 keyboard 2 central processing unit

3: load driving unit 4: program room

5: ram

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the back-tab function of an electronic typewriter. In particular, the present invention relates to a back-space or a return when moving to a tab before the current carriage position. Then, the step key is used to go to the desired tap position. The present invention relates to a back type control method of an electronic typewriter which enables the user to quickly go to a desired tap position using the back-tap function.

In general, in a conventional typewriter, when a tap is set and a tap key is input, there is a function of moving the carriage to a position after the current carriage position, that is, moving the carriage to the right, but moving the carriage to the left to the current carriage position. There was no back-tap function to find the previous tap position.

Therefore, in the conventional typewriter, the tap function moves the carriage to the right, so if the user passes the desired tap position, there is inconvenience of having to go back to the desired position with the tap function after back-space or return. As a result, it takes a lot of time to use the back-space and it was difficult to find the correct tap position.

SUMMARY OF THE INVENTION In view of the above problems, the present invention devised a back-step control method of an electronic typewriter that enables a user to quickly go to a desired previous tap position with a back-tap function when moving to a previous tap position from a current carriage position. This will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a control system of an electronic typewriter having a back-tap function according to the present invention, in which a central processing unit 2 receiving an input of a keyboard 1 is connected to a program of a program ROM 4. Accordingly, it is configured to control the carriage movement, the print wheel driving, the ribbon movement and the respective loads through the load driving unit 3 while using the memory function of the ram 5.

In the electronic typewriter control system configured as described above, the general function and the tap function are set by using the keyboard 1, and when the typing control is performed, the carriage is moved to the left according to the back-tap function. -The tap function adds a function of moving the carriage to the tap position before the current carriage position, that is, moving the carriage to the left.

2 is a control flow chart of an electronic typewriter according to the present invention. As shown in FIG. 2, when data is input through the keyboard 1, character typing is performed when the data is character data instead of function data. Type control is performed by performing an algorithm, and if the input data is a tap set function, the tap function is set according to the existing tap set function algorithm. If the input data is not a back-tap function, the current input data ( The algorithm performs the function according to the function of Data) and checks the step buffer that the current input data stores the back-tap set position. If the step position data is not set in the step buffer, an error bell is displayed. When the tap position data is set in the tap buffer, the tap function is set. Therefore, the end point of the tap buffer is stored in the tap buffer designation point and the tap set is After reading from the largest value of the position one by one, read the tap position data of the address indicated by the current tap buffer designation point, compare the current carriage position data with the read tap position data, and if the current carriage position data is large, the current carriage The carriage is backed to decrease by the tap position read from the position, and if the current carriage position data is smaller than the tap position data, the taper designated point is decreased by one until the designated point of the tap buffer becomes the start address of the tap buffer. Read the tap position data from the tap buffer address of the designated point, compare the current carriage position data with the tap position data and repeat the control process accordingly.When the designated point of the tap buffer reaches the tap buffer start address, an error bell sounds. Returns.

Therefore, the back-tap function reads the step position data from the end point of the step buffer in order according to the back-tap selection after the step set function for setting the tap position data in the step buffer, and then the current carriage position data reads the step position data. If it is large, the carriage is controlled by backing the carriage to a position reduced by the tap position.

As described above, according to the present invention, when a plurality of taps are set in an electronic typewriter, and a current tapping position passes a desired tap position when a user moves to a certain tap set position in the center, the present invention provides a back-tap. Since there is no function, it is time consuming and inconvenient because you have to go back by pressing the step key after the back-space or return, but according to the present invention, it is possible to easily and quickly go to the desired tap position.

Claims (1)

After setting the tap function by setting the tap position data on the electronic typewriter and selecting the back-tap function, the tap position data is read from the end position of the tap buffer that stores the tap position data, and the current carriage position data is read. If smaller, the tap position data is read in sequence until the start address is decreased while the address of the tap buffer is decreased, and if the current carriage position data is larger than the tap position data of the corresponding address currently read, the tap position read from the current carriage position A back-step control method for an electronic typewriter, characterized in that the carriage is back-tapped to a reduced position by a smaller amount.