COORDINATE APPARATUS Russian patent published in 2001 - IPC

FIELD: coordinate devices including program control linear electric motors, possibly precision machine tools and high-accuracy copying systems. SUBSTANCE: portal is mounted with possibility of motion along guides. Head with working tool is mounted on portal with possibility of motion along portal. Drive unit is in the form of linear electric motors whose stators are mounted on guides and on carrying beam of portal. Carrying beam of portal has at least three supporting bars. Supporting bars and stator of portal linear electric motor are mutually joined by means of crosss members with possibility of their independent thermal expansion in lengthwise direction. Supporting bars are prestressed by axial compression effort provided by means of tightening members. EFFECT: high accuracy of tool motion along predetermined path, enhanced reliability and increased useful life period of coordinate apparatus. 3 cl, 3 dwg