Calcomp Inc.

Sandor L Lengyel

August D Coby

A method and associated apparatus for frictionally compensating a vector plotter having an X-drive motor for driving plotting apparatus in +X and -X directions and a Y-drive motor for driving plotting apparatus in +Y and -Y directions and logic for applying positive and negative electrical drive currents to the respective motors to affect plotting. Plotter accuracy and associated plot quality are improved by the method which comprises the steps of, providing a memory for holding +X, -X, +Y, and -Y friction compensation factors; prior to the time of plotting with the vector plotter, calibrating the plotter by (1) causing the motors to move the plotting apparatus in +X, -X, +Y, and -Y directions, (2) measuring the friction during the +X, -X, +Y, and -Y directional movement, and (3) calculating and storing the +X, -X, +Y, and -Y friction compensation factors in the memory. At the time of plotting with the vector plotter, the method comprises adjusting the current applied to the drive motors by the plotter logic as a function of the proper friction compensation factor in the memory for the motor moved and the direction of motor movement.

Growing community of inventors

Orange, CA, United States of America

Sandor L Lengyel