B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
197/53
B41J 23/34 (2006.01) B41J 1/20 (2006.01)
Patent
CA 1170600
PRINTING APPARATUS Abstract of the Disclosure 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 charac- teristics independent of carriage speed. The printing unit includes a thin, lightweight, cir- cular, 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 accom- plished using only a single, windable, energy- storing mainspring and a mechanical energy trans- mission assembly coupling the rack and gear as- sembly 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 with- drawn energy for the printing cycle is preferably (Docket No. 16989) used for increasing carriage speed, so that print- ing 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.
370625
Engineering Research Applications Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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