Method of and apparatus for control of a force applied to or the

Details Method of and apparatus for control of a force applied to or the Method of and apparatus for control of a force applied to or the

1987-08-26

1988-07-19

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91429, F15B 1316

Patent

active

047577460

ABSTRACT:
A control for a press for controlling the flow of fluid to two hydraulic actuators which applies a desired working force to or which positions the press platen in a desired position including a sub-control for introducing first and second super-imposed oscillations on the fluid of the actuators of equal amplitude and opposite phase to reduce internal friction in the actuators without disturbing the desired applied force or position of the platen.

REFERENCES:
patent: 3242822 (1966-03-01), Barltrop
patent: 3402737 (1968-09-01), Goldstein
patent: 3709253 (1973-01-01), Spangenberg
patent: 4072353 (1978-02-01), Clark et al.
patent: 4527954 (1985-07-01), Murali et al.

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