Machine Tool Motion Measurement Using Non-Collinear Image Capture
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Solution Overview
Problem
Existing techniques are unable to measure the relative motion between a tool attacher and a work attacher in machine tools.
Innovation Solution
A measuring apparatus with an image capturer capable of capturing images at multiple positions not on the same line, an image capturing controller that captures specific points on XY, XZ, and YZ planes without changing the relative position of the tool or work attacher, and a calculator that calculates planar relative motion based on these captures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single image capturing element is used to capture images for measuring relative motion, then the device complexity is reduced, but the measurement precision deteriorates because it cannot accurately measure planar relative motion between tool attacher and work attacher
Solution Approach 1:
The image capturer is divided into multiple image capturing elements (at least three) positioned at different locations. Each element captures images from its specific position, and the calculator integrates these multiple perspectives to compute accurate planar relative motion measurements between the tool attacher and work attacher.
Solution Approach 2:
The patent transitions from single-point or single-line measurement to three-dimensional spatial measurement by positioning image capturing elements at multiple positions that do not lie on the same line. This multi-dimensional arrangement enables accurate measurement of planar relative motion that cannot be achieved with collinear sensors.
2Adaptability or versatility
If image capturing elements are positioned on the same line, then the device complexity is reduced, but the measurement capability deteriorates because it cannot measure planar relative motion
Solution Approach 1:
The image capturing elements are deliberately positioned asymmetrically in three-dimensional space, specifically at positions that do not lie on the same line. This asymmetric, non-collinear arrangement provides the geometric diversity necessary to measure planar relative motion, contrasting with symmetric or collinear arrangements that lack measurement versatility.
3Measurement precision
If multiple image capturing elements are used to measure planar relative motion, then the measurement precision is improved, but the loss of information increases due to the complexity of coordinating captures from multiple positions
Solution Approach 1:
The calculator receives image data from multiple capturing elements and iteratively computes the relative motion parameters. By using feedback from multiple perspectives and comparing captured images against reference data, the system resolves coordinate system correspondences and eliminates information loss through comprehensive data integration.
Data Source
AI summary
A measuring apparatus for measuring a planar relative motion between a tool attacher and a work attacher of a machine tool includes at least one image capturing element capable of performing image capturing at a first position, a second position, and a third position, which are not located on the same line. The image capturing elements at the first position, the second position, and the third position are caused to capture a first point, a second point, and a third point, respectively, arranged on at least one plane of an XY-plane, an XZ-plane, and a YZ-plane. The image capturing element at the second position and the image capturing element at the third position are caused to capture the first point, the image capturing element at the first position and the image capturing element at the third position are caused to capture the second point, and the image capturing element at the first position and the image capturing element at the second position are caused to capture the third point. Based on the image capturing result, a value indicating the planar relative motion between the tool attacher and the work attacher is calculated.