Typewriting machines – Having power-driven operator for plural functions
Patent
1982-05-13
1983-06-07
Coven, Edward M.
Typewriting machines
Having power-driven operator for plural functions
400376, 4001612, 400146, 101 99, 101111, B41J 2334, B41J 2336
Patent
active
043868630
ABSTRACT:
An improved, low cost, high speed, impact printing apparatus usable as a typewriter or as a machine printer is disclosed which includes a carriage translatable along a page through a rack and gear assembly and having an electronically controlled printing unit oriented to reveal the line of write and give constant printing characteristics independent of carriage speed. The printing unit includes a thin, lightweight, circular, bidirectionally shiftable, distensible synthetic resin band having printing characters thereon, along with a single, spring-powered impression hammer for selectively engaging and distending the band toward the page in order to print a selected character. Printing and letter-spacing are concurrently initiated and accomplished using only a single, windable, energy-storing mainspring and a mechanical energy transmission assembly coupling the rack and gear assembly and printer in parallel. The transmission assembly includes gearing for withdrawing a limited, predetermined amount of motive energy from the mainspring for each printing cycle, and for distributing such energy to achieve band spin and character selection, hammer cocking, and letterspacing translation of the carriage; after the variable amount of energy required for actual printing is determined (by the required band spin to achieve character selection) remaining withdrawn energy for the printing cycle is preferably used for increasing carriage speed, so that printing can occur at a variable but statistically very high speed (on the order of fifty characters per second or greater). During tab spacing, the character band and drive rotate and act as an airfoil governor to prevent attainment of undue, potentially destructive carriage translation speeds. Initiation and control of letterspacing, printing and tab spacing functions are achieved through appropriate logic circuitry coupling the keyboard or other input to a pair of solenoids, with mechanical linkages between the solenoid pair and transmission assembly.
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Coven Edward M.
Engineering Research Applications
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