公开(公告)号：US4045660A

公开(公告)日：1977-08-30

申请号：US681573

申请日：1976-04-29

申请人： William Robert Weisgerber ,  Ralph Charles Taylor

发明人： William Robert Weisgerber ,  Ralph Charles Taylor

IPC分类号： G05B9/02 ,  G05B19/414 ,  G05B19/18 ,  G06F15/46

CPC分类号： G05B19/414 ,  G05B2219/36395 ,  G05B2219/41422 ,  G05B2219/50084 ,  G05B2219/50085 ,  G05B2219/50103 ,  G05B2219/50249

摘要： A method and apparatus are disclosed for automatically realigning a machine element to a predetermined position after an interruption of power to a drive mechanism coupled to the machine element. After the termination of power, the apparatus measures a displacement of the machine element during a predetermined period of time; and this displacement is stored in a nonvolatile memory. When power is restored to the drive mechanism, the apparatus is operative to automatically move the machine element back through a distance equal to the stored displacement. Consequently, the machine element realigns to the position it had before the power interruption.