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| Number | Title | Issue Date |
| 4215943 | Motor driven single element printer A printer has a horizontally movable carrier which supports a print head including a print element on which are disposed type characters in a two dimensional array with the element controllably movable by motors in two degrees of freedom to selectively po... | 08/05/1980 |
| 4215302 | Control system for stepping motors, a method of operating stepping motors, and a method for selecting current patterns for stepping motors An open loop control device and method are provided for stepping motors. By energizing a motor so that the rotor motion is the result of a revolving field which is of piecewise constant speed and uniform field strength, the rotor can be brought to a stop ... | 07/29/1980 |
| 4176977 | Proportional carrier control and moving mechanism for electric typewriter A drive arrangement for a single element typewriter in which the element is mounted on a moving carrier, for facilitating proportional spacing incremental movements of the carrier. The carrier is bidirectionally driven by a servo motor which rotates bidir... | 12/04/1979 |
| 4088217 | Typewriter attachment The device of the present invention is intended to be attached to a ball-element type typewriter to permit rapid switching among a plurality of ball elements. While the invention has utility in any instance where the need arises for switching rapidly and ... | 05/09/1978 |
| 4067430 | Typewriter carriage movement mechanism There is disclosed a typewriter carriage control mechanism which is used with a single element print head which is constructed and arranged for transverse movement across the typewriter in which a ratchet wheel is connected to the regular spring for movin... | 01/10/1978 |
| 3980169 | Impact control for single element printer A single element type carrier having type characters with different printing areas is impacted against a recording medium with different impact intensities substantially corresponding to the different printing areas to effect uniform printing. The type ca... | 09/14/1976 |
| 3941228 | Electromagnetically operated printer A printer, suitable for operation by an electric computer, includes a traveling carriage. The carriage carries a type-head that is vertically and rotatably shiftable to properly orient a type element for printing. Movement of the carriage, as well as vert... | 03/02/1976 |
