Printing apparatus

Details Printing apparatus Printing apparatus

B - Operations, Transporting

41

J

197/54, 101/93

B41J 1/54 (2006.01) B41J 1/50 (2006.01) B41J 9/12 (2006.01) B41J 19/20 (2006.01)

Patent

CA 1048953

Abstract of the Disclosure 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. - 1 -

263163

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