Patent ID: 8056434
Filing Date: 2011-11-15
Classification: G01B,Y10T

Abstract:
1. An advancing means for a multi-coordinate measurement table of a coordinate measuring device, said measurement table comprising at least one coordinate axis, said advancing means comprising: a drive unit arranged for each of said at least one coordinate axis, each of said drive unit comprising a friction rod and a motor, said motor comprising a motor shaft, wherein said motor shaft contacts a first side of said friction rod; a closed frame comprising a first frame section and a second frame section, wherein a pivot arm is pivotable about a stationary axis of said first frame section and said second frame section is connected to said first frame section by a connection; at least one press roller arranged in said first frame section and in contact with a second side of said friction rod, wherein said first side is opposite said second side; two support rollers arranged on said pivot arm and in contact with said motor shaft; at least one pressing means arranged to bias said at least one press roller, said friction rod, said two support rollers and said motor shaft against each other with a pressing force, wherein said motor shaft frictionally engages said friction rod and converts rotational movement of said motor shaft into a linear movement of said friction rod; and, an adjusting means comprising said pivot arm and associated with said pressing means, wherein said pivot arm is coupled to said adjusting means, said two support rollers are arranged on said pivot arm, said pivot arm is pivotable about said stationary axis, said adjusting means comprises a linear motor and a force measuring sensor arranged between said linear motor and said pivot arm and said adjusting means is arranged to variably adapt said pressing force depending on an acceleration of said friction rod.