Patent ID: 6415200
Filing Date: 2002-07-02
Classification: G05B

Abstract:
A feedback compensating apparatus for a working system including a working machine for performing a working operation on at least one working portion of each of a plurality of workpieces, to process said each working portion as desired, such that working operations on said plurality of the workpieces take place successively one after another, and machine control means for determining a working condition of said working machine on the basis of an extraneous signal, and for controlling said working machine according to the determined working condition, the apparatus comprising;a measuring device for measuring actual dimensions of the working portions of the workpieces processed or under processing by said working machine; said measuring device including a post-process measuring device for measuring the actual dimensions of the working portions of the workpieces previously processed by said working machine, said post-process measuring device being positioned relative to said working machine such that there exists at least one pre-measured workpiece previously processed by said machine and which has not been measured by said post-process measuring device; data obtaining means for obtaining dimensional data on the basis of outputs of said Post-Process measuring device said dimensional data including a dimensional error of the working portions of the workpieces, and a derivative of said dimensional error of the workpieces, said derivative representing a gradient of a straight line approximating successive measured values represented by the outputs of said post-process measuring device, said successive measured values including a currently measured value currently obtained by said post-process measuring device and at least one measured value which precedes said currently measured value; and compensating means for determining a compensating signal as said extraneous signal on the basis of said dimensional data, and for applying said compensating signal to said machine control means, to adjust said working condition of said working machine.