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Piezoelectric Object Feeding

IP.com Disclosure Number: IPCOM000097843D
Original Publication Date: 1961-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Horchos, LA: AUTHOR

Abstract

The object feeder has an expanding crystal track which provides a waveform conveyor for advancing parts. The feeder comprises a series of closely stacked ceramic piezoelectric plates which are shaped generally rectangularly with a depressed top outline forming the shape of a feeding track 22.

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Piezoelectric Object Feeding

The object feeder has an expanding crystal track which provides a waveform conveyor for advancing parts. The feeder comprises a series of closely stacked ceramic piezoelectric plates which are shaped generally rectangularly with a depressed top outline forming the shape of a feeding track 22.

The plates 11... 18 are coated with a conductive material 20 on both sides. Material 20 does not extend to the edges of the ceramic plates. An insulation 21, such as nylon, is coated as a flush border around the edges of the plates. This nylon border is provided to insure uniform thickness for stacking. The composition of the piezoelectric plates is of an electrostrictive ceramic, such as barium titanate. This is subject to expansion in various directions, depending upon the crystal orientation of the material, when a voltage is applied across the plate. This expansion takes place very rapidly and is useful for high speed object feeding.

The track (upper drawing) is assembled with pairs of related plates arranged side by side. Electrical connections are made to each junction between each pair. All even interval junctions connect to ground. All other junctions connect to individual upper terminals V1, V2, etc. This allows individual voltages to be impressed across each pair of plates. Voltage V1 is impressed across plates 11 and 12; voltage V2 is impressed across plates 13 and 14, etc. With such different voltage across each unit pair of plates, e...