1. Field of the Art
The present invention relates to an electronic typewriter having a carriage which is automatically returned upon entering of predetermined carriage-return data such as space data or hyphen data through the corresponding key on a keyboard, if the carriage-return data is entered to be executed within a predetermined automatic-carriage-return zone which consists of a desired number of columns just before or up to the right-hand margin of a line of printing.
2. Related Art Statement
In making documents by means of an electronic typewriter, it is a common practice that a pair of successive space data are entered following period data at the end of a sentence in order to distinguish a space between sentences from a space between words of a sentence.
If the above typing method is used on an electronic typewriter having a function of executing an automatic carriage return, more specifically, if two sets of space data are entered in succession following period data as data to be executed within an automatic-carriage-return zone, the first space data causes the automatic carriage return operation. As a result, the second space data of the two is, against operator's will, executed to insert a space into the first column of a new line on a printing sheet of paper, whereby the beginnings of individual printed lines on the sheet of paper become uneven or indented unexpectedly.
To solve above problem, the existing electronic typewriters are designed not to execute the second space data if two sets of space data are entered in succession for execution within the automatic-carriage-return zone.
The above solution, however, has another problem which will occur when a certain number of space data are entered through a space key in order to insert the corresponding number of spaces at the beginning of a new line to open a paragraph. In other words, since space data is not executed when it is entered in the automatic-carriage-return mode, the number of space data which are executed at the beginning of a new line does not always correspond to the number of depressions of the space key. In order to open a new paragraph, therefore, it is required in the existing electronic typewriters that a desired number of space data be entered only after completion of the automatic carriage return operation. As a result, the existing electronic typewriters have a disadvantage of low typing speed.