Abstract: A rotational movement of a constant speed drive is translated into a linear reciprocating motion having two relatively long, constant slope sections within a cycle, such section occuring in between two sequential reversals, and representing a constant speed. The speed modification is obtained by a universal joint-cross link with oblique axes and a crank output having a linear phase.

Abstract: A typewriter has a Keyboard (12), including a Tab Set Key (22), a Tab Clear Key (24), and a Tab Actuating Key (26). Operation of the tab set key stores stop positions of the Carrier (18) with respect to the typewriter's Platen (14). Shallow depression of the tab actuating key causes the carrier to move forward (right) to the next tab stop position. A first deep depression of the tab actuating key establishes a Reverse Tab Mode causing the carrier to move backward (left) to the nearest preceding tab stop position and causing the platen to rotate (index) so as to position the Printing Element (16) one line down on the paper, thereby to facilitate typing the next line of single column material without effecting a carrier return and forward movement of the carrier to the beginning of the column.

Abstract: On electronic typewriters which have the ability to record into a small working memory the escapement of the characters which are keyed at the keyboard, it is many times advantageous to be able to reposition the carrier at the rightmost end of the typed material automatically. This is particularly advantageous when it has been necessary to back the carrier up along the printed line for purposes of erasing, correcting or inserting material into that line. Disclosed herein is an electronic typewriter which is controlled by the electronic logic such that the depression of a selected control key will result in the carrier moving from a position within the typed text on a particular line to the right most position the carrier has occupied within that line during earlier typing.