G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 9/10 (2006.01) G06K 15/22 (2006.01)
Patent
CA 2063975
ABSTRACT OF THE DISCLOSURE A graphics plotter for drawing a series of connected vec- tor lines forming a plot. The plotter has a motor control for controlling motors which drive a pen to move relative to a medium at a variable velocity in a plane defined by a major axis and a minor axis perpendicular to the major axis. The motor control determines a minimal nonzero terminal velocity of the pen along the major axis at a point at which a maximum change in direction occurs. The motor control has a program for determining a mini- mal nonzero optimal velocity at the point of maximum change in direction. The minimal nonzero optimal velocity is the junction of a ramped-down optimal velocity preceding the point of maximum change in direction and a ramped-up optimal velocity succeeding the point of maximum change in direction. The motor control also includes a double integrating filter implemented in the sampled domain for limiting the acceleration of the pen along the major axis at the point of maximum change in direction to a discrete value such that the difference between the actual pen trajectory and a desired pen trajectory is an amount less than or equal to a predetermined acceptable error.
Freeman Marvin
Poole Dan R.
Freeman Marvin
Marks & Clerk
Poole Dan R.
Summagraphics Corporation
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