Pre-loaded actuator using piezoelectric element

Details Pre-loaded actuator using piezoelectric element Pre-loaded actuator using piezoelectric element

1991-07-30

1993-04-27

Jones, David

Metal deforming

With means to drive tool

72430, 72446, 310328, B21J 720

Patent

active

052051471

ABSTRACT:
Pre-loaded piezoelectric actuators provide improved work piece displacement, frequency of repetition, accuracy and repeatability. Actuators may use a coil spring providing a compressive force adequate to substantially fully compress a laminated piezoelectric element on a non-destructive basis. Upon activation, a pre-loaded actuator delivers a full workpiece drive stroke because piezoelectric element axial compression has previously occurred. Pre-loading methods and pre-loading to damp out element oscillation are also disclosed.

REFERENCES:
patent: 4438364 (1984-03-01), Morison
patent: 4471256 (1984-09-01), Igashira et al.
patent: 4781477 (1988-11-01), Nagasawa
patent: 4909440 (1990-03-01), Mitsuyasu et al.
patent: 4967586 (1990-11-01), Hecht
patent: 5004945 (1991-04-01), Tomita et al.

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