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US 4,193,703 AGranted
Matrix printer with piezoelectrically driven printing needles
AssigneeInternational Business Machines Corporation
InventorWalter Sakmann
Life of this patent
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Abstract
A matrix printer with piezoelectrically driven printing needles is described in which an electrically controlled piezocrystal arrangement transfers upon its expansion, its change of length to a buckling spring. Coupled to the buckling compression column spring is a printing needle which, upon the deflection of the buckling spring, is driven in the printing direction.
Claims2
In a matrix printer having piezoelectrically driven printing elements, the improvements comprising:
- a buckling compression column spring;
- at least one piezoelectric crystal arrangement provided with electrical contacts for electrical control of the expansion of said crystal arrangement;
- means for coupling the expansion of said crystal arrangement to said spring along the line of the axis of said spring to create a buckling thereof;
- and
- a movable printing element supported adjacent to the central portion of said spring to be deflected therewith when said spring buckles;
- said buckling spring being arranged between two piezoelectric crystal arrangements acting at opposite ends thereof.
3 more elements
Dependencies are inferred from the claim text.