Workpiece Position Imaging Along a Preset Boundary Path
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Solution Overview
Problem
Existing laser machining devices require lengthy communication times and processing delays to determine the position of a workpiece, leading to inefficiencies in the machining process due to the need for repeated sensor detection, controller determination, and driver movement.
Innovation Solution
A workpiece position determination device that uses an imager moving along a prescribed trajectory to capture image information and determine the workpiece position based on stored image and coordinates data, eliminating the need for feedback control and reducing communication delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is used with feedback control to detect boundary positions, then measurement precision is improved, but the time required for position determination increases due to repeated detection and communication cycles
Solution Approach 1:
The patent applies preliminary action by pre-planning the sensor's movement trajectory to pass through multiple boundary portions in advance, and pre-storing the detection results. This eliminates the need for repeated real-time communication and feedback control cycles, significantly reducing the time required for position determination while maintaining measurement precision through comprehensive boundary detection along the predetermined path
2Measurement precision
If feedback control is implemented with repeated sensor detection and controller communication, then position determination accuracy is improved, but device complexity increases due to multiple communication cycles
Solution Approach 1:
The patent extracts the complex feedback control and repeated communication cycles from the position determination process. By using a predetermined trajectory and storing detection results directly, the system removes the need for continuous feedback loops between sensor, controller, and driver, simplifying the control system architecture while preserving position determination accuracy through comprehensive boundary sampling
Data Source
AI summary
A workpiece position determination device includes an imager, a driver to move the imager relative to a workpiece in a planar direction parallel to a planar surface of the imager, a controller to control the driver so that the imager moves along a prescribed trajectory that passes through locations in a boundary portion in the planar surface in a plan view, a storage to store image information captured by the imager while the imager moves along the prescribed trajectory, and coordinate information of the imager at a time of capturing each image information, a position determiner to determine the position of the workpiece in the planar direction corresponding to the boundary portion based on the image information and the coordinate information stored in the storage, and an offset determiner to determine an offset of the workpiece from a reference position based on a determination result from the position determiner.