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Piezoceramic Ballistic Wire Matrix Print Head

IP.com Disclosure Number: IPCOM000046120D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Giordano, FP: AUTHOR

Abstract

Conventional wire matrix print heads are solenoid-driven and are speed- limited because of their power dissipation. The packaging of the head is also a problem because of the need to dissipate the heat in the coils, which prevents compact design. Typical power requirements for solenoid-driven wire matrix heads is 9 watts per wire at 900 Hz.

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Piezoceramic Ballistic Wire Matrix Print Head

Conventional wire matrix print heads are solenoid-driven and are speed- limited because of their power dissipation. The packaging of the head is also a problem because of the need to dissipate the heat in the coils, which prevents compact design. Typical power requirements for solenoid-driven wire matrix heads is 9 watts per wire at 900 Hz.

The present invention is to use a piezoceramic bender element to convert electrical energy to mechanical energy to drive a wire matrix print head. The two-element piezoceramic bender would be cantilever- mounted and wired for parallel operation (Fig. 1). In this configuration, with bender elements 1.5 to 2 inches long, deflections on the order of .020 inch are attainble with an applied voltage of 200 volts and a power requirement of only 150 milliwatts per wire.

Once the bender has been excited and achieved the required velocity, it will collide with the print wire and ballistically propel it into the ribbon and paper. Since the mass of the piezoceramic bender is much greater than the mass of the print wire, the theory for conservation of kinetic energy and momentum predicts that the collision will be almost perfectly elastic. Using this prediction, the final velocity of the piezeoceramic bender need only be one half the final velocity of the print wire necessary to print. After the print wire has driven the ribbon into the paper and printed, a spring assembly will return it to its...