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Carriage Control for On The Fly Printing

IP.com Disclosure Number: IPCOM000075600D
Original Publication Date: 1971-Oct-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Meier, JH: AUTHOR

Abstract

Acceleration forces are kept to a minimum in this print-carriage drive design, by the elimination of solenoids and pawls normally used to position the carriage in correct printing registration.

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Carriage Control for On The Fly Printing

Acceleration forces are kept to a minimum in this print-carriage drive design, by the elimination of solenoids and pawls normally used to position the carriage in correct printing registration.

Carriage 1 is driven by an endless cable 2 anchored to drum 3 affixed to shaft 4. The shaft is rotatably mounted in bearings 5 fastened in forked arm 6, which is spring biased in a clockwise direction about its pivot point. A worm gear 7 is fastened to shaft 4. Worm wheel 8 is fastened to a continuously rotating shaft that drives the print mechanism, not shown. A nonrotating worm wheel 9 is mounted on pivoted bracket 10, which is spring biased in a counterclockwise direction against a stop. Solenoids 11 and 12 are selectively energized to engage or disengage the worm wheels from the worm gear.

With the machine at rest neither solenoid is energized. Return spring 13 urges the forked arm 6 against its stop so that worm gear 7 is disengaged from worm wheel 8. Worm wheel 9 is urged into engagement with the worm gear by spring 14. The carriage is moved at a uniform rate for printing, when solenoid 11 is energized to shift forked arm 6 so that worm gear 7 engages the continuously rotating worm wheel 8, as shown. Simultaneously, worm wheel 9 is disengaged from the worm gear.

The carriage is returned to its home position by a return spring, not shown, when solenoid 11 is de-energized allowing the worm gear to disengage the driving worm whee...