Method of and apparatus for controlledly moving a movable element

Abstract

A method of and apparatus for controlledly moving a movable element in a machine tool having a drive unit drivingly coupled to the movable element, a motor drivingly coupled to the drive unit and a motor driver circuit for energizing the motor to drive the drive means, thereby moving the movable element, wherein a sequence of feed signals are furnished from a command source to energize the motor for the purpose of achieving a corresponding and desired sequence of movements of the movable element. The apparatus includes: a first sensing unit directly responsive to a displacement of the movable element resulting from the application of each of the sequential feed signals to the motor driver circuit for providing a first signal as a function of the displacement; a second sensing unit responsive to the feed signals for providing a sequence of second signals each as a function of each of the sequential feed signals; a memory unit for successively memorizing on a memory medium the first signals corresponding to the sequence of the second signals; a readout unit for the memory medium to successively reproduce the first signals therefrom corresponding to the sequence of the second signals; and a logic unit for processing the reproduced first signals and the feed signals to provide the sequence of revised feed signals and sequentially applying the revised feed signals to the motor driver circuit, thereby achieving the desired sequence of movements of the movable element.

Dependencies are inferred from the claim text.