For an impact serial printer, like a typewriter terminal, it is desirable to print fast and to print with a minimum of maintenance. For printing to take place, the carrier containing the print element must be in the correct position along the print line and the character selection must be made by the proper positioning of the print element. This paper discusses a cylindrical thin-walled print element containing an entire character array on its outside surface. The print element is rotated and translated independently by two prime movers (motors). The cylindrical print element geometry and the prime movers are optimized to minimize the time required for character selection. Surface area, stress, inertia, torque, and motor requirements are considered. Selection times and printing rates are computed for simulated printing conditions.
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