International Business Machines Corporation

Blair Robertson Martin

Johann Hans Meier

Jerry Wesley Raider

A print wheel is rotatably mounted on a carrier driven by a stepper motor to traverse the print line of a document. The wheel contains two or more arrays of characters with preferred characters most commonly used in each array and a number of lesser-used characters divided between the arrays. The print wheel normally makes one revolution for each two or more print positions and if a compare is made in each array the stepper motor advances the carrier at constant speed. Should a compare not be found or the character desired be too close to a previous character for the print hammer to settle out, the stepper motor is stopped for that position until a compare is made in some following array.

High speed wheel printer and method of operation

A rotatable print disk is mounted on a carrier which traverses along the print line. The disk is moved from each character position to the next by the shortest distance and it is stopped at the time of printing. The carrier is moved from one print position to the next at a speed which is selected depending on the time required for the disk to rotate to the next character. Printing takes place with the carrier moving at one of a number of speeds. Hammer firing is timed dependent on printing speed.

Controls for a movable disk printer

A serial matrix printer has a print head mounted to move along a print line. The print head has means to change the relative vertical positions of some of the print wires with respect to the others. A first embodiment uses a pair of wire guides arranged so that one is translatable with respect to the other, thereby altering the relationship of the wires in the one guide with respect to the other, and a second embodiment employs a rotatable guide which positions the wires at angles such that the desired spatial relation between the wires is obtained.

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Owego, NY, United States of America

Blair Robertson Martin