Workpiece Pick-Up Apparatus Dynamic Gripping Position
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Solution Overview
Problem
Conventional workpiece pick-up apparatuses face challenges with increased labor, calculation time, and data amount due to the need for calculating multiple gripping position candidates and redefining priorities for different hand profiles, especially when the number of candidates is small, leading to potential interference and instability in gripping.
Innovation Solution
A workpiece pick-up apparatus that includes a hand, a robot, a sensor for three-dimensional measurement, and an information processing unit to dynamically determine the gripping position or posture based on hand profile data and workpiece measurement data, using an optimum gripping candidate creating section to extract grippable features and match them with hand profiles, reducing the need for pre-defined workpiece profiles and minimizing data and calculation requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of candidates for gripping position are calculated in advance, then the risk of hand interference or disturbance to other workpieces is reduced, but the labor, calculation time, and data amount are increased considerably
Solution Approach 1:
The patent applies dynamics by making the gripping position determination adaptive rather than static. The system dynamically adjusts the number of candidates to evaluate based on the actual spatial distribution of workpieces detected by the sensor. When workpieces are densely packed, more candidates are considered; when they are sparse, fewer candidates are needed. This dynamic adaptation resolves the contradiction by optimizing calculation time while maintaining gripping reliability through context-aware candidate selection.
Solution Approach 2:
The system changes the parameter of candidate quantity based on workpiece configuration. Instead of using a fixed large number of candidates in all situations, the patent modifies the number of candidates evaluated according to the detected workpiece arrangement. This parameter change allows the system to reduce calculation time in simple cases while maintaining reliability in complex cases, effectively resolving the technical contradiction.
2Measurement precision
If partial profile segmentation and priority assignment are performed for different hand profiles, then the gripping accuracy is improved, but the labor and calculation time are increased
Solution Approach 1:
The patent applies universality by creating a hand model with universal features that can be applied across different hand profiles. Instead of requiring separate segmentation and priority assignment for each hand, the system uses universal hand features (fingers, palm, wrist positions) that work for all hand types. This universal approach maintains gripping accuracy while dramatically reducing the complexity of data preparation, as the same universal model serves multiple hand configurations.
Solution Approach 2:
The system uses copying by creating a virtual hand model that replicates the essential geometric features of the actual hand. This virtual model is then used for all gripping calculations regardless of the specific hand profile. By copying the functional geometry rather than storing detailed profiles for each hand, the system achieves accurate gripping position determination without the labor-intensive process of separate segmentation and priority assignment for each hand type.
Data Source
AI summary
A workpiece pick-up apparatus including: a hand for gripping a workpiece; a robot for bringing the hand into a desired gripping position or posture; a sensor for performing three-dimensional measurement of the workpiece to obtain workpiece measurement data; a storage medium for accumulating at least hand profile data; an information processing unit for calculating the gripping position or posture based on data from the sensor and data from the storage medium; and a control unit for controlling the robot based on the gripping position or posture calculated by the information processing unit. The information processing unit includes an optimum gripping candidate creating section for directly deriving the gripping position or posture based on the workpiece measurement data and the hand profile data.


