At&t Teletype Corporation

Other

At&t Information Systems Inc.

Robert M Wentzel

Norman A Jacobs

Casimer Gotfryd

David B Durkee

James P Koller

Stephen L Kay

Hartland P Klotz

A key switch utilizing a buckling compression spring to move a switch actuator mechanism includes a cylindrical core of resilient material located within an opening formed by the coils of the compression spring to attenuate the acoustical energy generated by the buckling and unbuckling action of the spring.

Quiet key switch

In an ink jet printer utilizing piezo ceramic actuators to generate ink droplets, the velocity of the ink droplets is controlled by adjusting the piezoelectric effect of the actuators.

Method for velocity adjustment of ink jet nozzles in a nozzle array

The illustrated ink jet (19) includes a chamber (22) containing a quantity of ink (54) discharged through a nozzle orifice (28) in the form of droplets (84). The ink is discharged in response to movement of an actuator positioned over a chamber (22) opening. The actuator (50) includes a piezoceramic plate (60), the surfaces of which are covered by electrodes (62, 64). Soldered to the electrode (62) is a bending plate (56) which is secured by adhesive (58) to a flexible sheet of insulating material (52). Control signals are fed through conductors (72, 59) to the electrodes (62, 64).

Print head actuator for an ink jet printer

Growing community of inventors

Mundelein, IL, United States of America

Robert M Wentzel