Printing apparatus

Details Printing apparatus Printing apparatus

1976-10-12

1977-10-04

Rader, Ralph T.

Textiles: fiber preparation

101 9316, 178 34, 235 619R, B41J 124

Patent

active

040519422

ABSTRACT:
A printing apparatus for an electronic calculator or the like comprises a first type wheel formed with mathematical operator symbols which is fixed to a spline shaft and a second type wheel formed with digits which is slidably mounted on the spline shaft for integral rotation. A stepping motor rotates the spline shaft for character selection. A carriage is connected to the second type wheel and is movable by a cable wound around drive and take-up spools to move the second type wheel along the spline shaft for serial feed. A single electrical solenoid actuates a printing hammer for printing and subsequently actuates a ratchet and pawl mechanism to serially feed the second type wheel by one character position in one reciprocation of the solenoid plunger. A linkage initially connects the plunger to a first printing hammer associated with the first type wheel to print the mathematical operator and subsequently to a second printing hammer associated with the second type wheel to serially print digits from least significant to most significant.

REFERENCES:
patent: 3286625 (1966-11-01), Petit
patent: 3374873 (1968-03-01), Takenaka
patent: 3442364 (1969-05-01), Ragen
patent: 3630335 (1971-12-01), Chamness
patent: 3850097 (1974-11-01), Sweeney
patent: 3957151 (1976-05-01), Kashio

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