US 2019/0195626 A1 · MACHINE GEOMETRY MONITORING

Abstract

A machine state monitoring system for recurrently determining a change in static or dynamic properties of a geometry of a machine with positional encoders to derive a coordinate information of at least a first machine portion with respect to a second machine portion, which are movable with respect to one another. The monitoring system includes one calibration-monitoring-unit with an optical, at least two-dimensional measuring location sensing unit which is fixed to the first machine portion and configured to optically sense an at least two dimensional location information of an artifact which is provided at the second machine portion, and temporarily moved into a sensing range for determining the change in the static or dynamic properties of the geometry of the machine by a comparison of multiple of such sensings, the compensation parameters are then updated and is used to derive the coordinate information from the encoders.

Claims15

Dependent claims

A machine state monitoring system for recurrently determining a change in static or dynamic properties of a geometry of a machine, which machine is a surface or form scanning machine, measurement machine or machine tool, and comprises:

positional encoders to derive a coordinate information of at least a first machine portion with respect to a second machine portion, and which machine portions are movable with respect to one another by a motorized drive unit along a desired trajectory
at least one calibration-monitoring-unit with an optical,
at least a two-dimensional measuring location sensing unit which is fixed to the first machine portion and configured to optically sense an at least two dimensional location information of at least one artifact which is provided at the second machine portion, which artifact is temporarily moved into a sensing range of the calibration-monitoring-unit for determining the change in the static or dynamic properties, by a comparison of multiple of such sensings,
wherein the monitoring system is configured to monitor the change in the static and/or dynamic properties of the geometry of the machine and to update compensation parameters of a model or map of the geometry of the machine which is used to derive the coordinate information from the encoders.

1 more element

A method for monitoring changes in static or dynamic properties of a machine geometry of a machine which includes a first machine portion and a second machine portion which are positionable with respect to one another by a motorized drive unit, and positional encoders for deriving a coordinate information of the first machine portion with respect to the second machine portion, wherein the first machine portion includes a calibration monitoring unit fixed to it and wherein the second machine portion is comprising an artifact, the method comprising:

positioning the artifact at a defined monitoring position at the calibration monitoring unit;
optically sensing a location information of the artifact in at least two dimensions;
deriving the changes in the static and/or dynamic properties of the machine geometry by a comparing of the location information with at least one preceding location information of at least one of the recurrent positionings of the artifact;
and
updating compensation parameters of a model or map of the geometry of the machine which is used to derive the coordinate information from the encoders according to the derived static or dynamic properties of the machine geometry.

2 more elements

Dependencies are inferred from the claim text.

Machine geometry monitoring

Life of this patent

Machine geometry monitoring

Life of this patent

Abstract

Claims15