Control structure of grinding machine

Abstract

A grinding machine includes a sensor for detecting the variation of the current of a motor thereof to determine the timing that a grinding assembly thereof touches a workpiece. An automated control system computes the grinding path of the grinding assembly according to the timing. Thus, all of the workpieces are cut the same even though the workpieces are held at different positions on the chuck.

1 . A grinding machine comprising: 
 a machine base;    a chuck provided on said machine base for holding a workpiece;    a grinding assembly controllably movably mounted on said machine base for corresponding to said chuck;    a motor mounted on said machine base and electrically connected with said grinding assembly via a control wire for driving said grinding assembly to move on said machine base;    an automated control system mounted on said machine base and electrically connected with said motor via a control wire for setting a path of said grinding assembly; and    a sensor mounted on said control wire between said motor and said automated control system for monitoring a current of said motor;    wherein said sensor detects a variation of said current of said motor when said grinding assembly touches said workpiece, said sensor generates a signal and transmits it to said automated control system, and then said automated control system computes a grinding path of said grinding assembly.    
   
   
       2 . The grinding machine as defined in  claim 1 , wherein said sensor is an amperemeter.