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Print Wheel Control Mechanism

IP.com Disclosure Number: IPCOM000077849D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Hahn, AE: AUTHOR

Abstract

The position to which a print wheel or the like is rotated and stopped is controlled by a line of photocells selectively and successively energized through a series of holes drilled through the wheel and arranged in a spiral path.

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Print Wheel Control Mechanism

The position to which a print wheel or the like is rotated and stopped is controlled by a line of photocells selectively and successively energized through a series of holes drilled through the wheel and arranged in a spiral path.

Characters 0-9 are uniformly spaced about the periphery of a print or embossing wheel 10. Motor 11, through clutch/brake 12, drives and stops wheel 10 to carry a selected character to a print position, where it will be printed or embossed on a credit card 13 or the like by suitable operation of actuator 14.

Wheel 10 has a series of holes 15-24 arranged in a spiral path, so as to register successively with corresponding photocells 15'-24' arranged in a straight line behind a radius of the wheel. This allows light from source 25 to strike each photocell in turn, at the instant the particular corresponding character 0-9 approaches print position. As each photocell 15'-24' is impulsed in turn, the signal is conveyed via a respective lead 15a-24a to one input of a respective one photoamplifiers 26. The other input to each photoamplifier is from a respective select line 0'-9' that is selectively energized from a suitable source, not shown, when the particular character 0-9 is to be embossed or printed, thereby to cause brake 12 to stop wheel 10 with the selected character imprint position. After printing, the selected line 0'-9' is de-energized, disabling the brake and causing the motor to rotate the wheel until...