Following error limit system for graphic recorder

Details Following error limit system for graphic recorder Following error limit system for graphic recorder

1987-07-20

1988-12-27

Goldberg, E. A.

Recorders

Markers and/or driving means therefor

Stylus feature

364520, 346141, G01D 1516, G06F 15626

Patent

active

047944080

ABSTRACT:
A following error limit system is operative within a graphic recording system having a pen carriage moveable along a first path and a media moveable along a second path. A closed loop servo system is operative upon the pen carriage motor and is controlled by a position information processor. A following error processor is coupled to the servo system and compiles a periodically sampled table of absolute position, commanded position and following error for the servo system during the initialization process. The carriage is moved in a first direction at a constant velocity until it impacts a fixed limit stop which impeads further carriage motion. The following error processor determines the absolute or limit position of the pen carriage on the basis of the information derived from the servo system. The system functions without the use of external limit switches and limit detectors.

REFERENCES:
patent: 4573129 (1986-02-01), Tribolet

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