公开(公告)号：US3609319A

公开(公告)日：1971-09-28

申请号：US3609319D

申请日：1968-12-03

申请人： ELECTRONIC ASSOCIATES

发明人： CLIFFORD WILLIAM JR ,  DEMKO JOHN G ,  KINDLE WILLIAM K

IPC分类号： G06K15/22

CPC分类号： G06K15/22

摘要： Plotting of digital data is accomplished by optimizing plotting speed in terms of a curve-fitting technique. Segments of a curve whose x and y end points are specified, are defined in terms of a set of parametric equations represented by third order polynomials with distance as the independent variable. The curvature of these segments is then developed. Optimum plotting speed is then determined considering the requisite degree of curvature and the physical limitations of the plotter such as arm and pen mass and motor torque. This optimum plotting speed determines the rate of generation of the parametric equations in x and y and drives the system through a hybrid servosystem for the independent variable distance. Thus, the plotter is driven to the desired data points with a geometry independent of velocity.