Robot Arm Visual Positioning for Medication Cassette Handling
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Solution Overview
Problem
Automated medication dispensing apparatuses face challenges in accurately gripping and positioning medication cassettes due to structural limitations, leading to potential damage and reduced efficiency in medication dispensing, especially in large-scale systems where cassettes may fall during movement.
Innovation Solution
A robot arm control system that uses a camera to detect markers on medication cassettes, calculates positional differences, and adjusts the robot arm's operation control values to accurately grip and move cassettes to their correct positions, incorporating a mutual coupling structure for precise handling and preventing cassette damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hundreds of medication cassettes are mounted in a rack of a medication cassette storage unit, then the accommodation space is optimized, but the rack or medication cassette is pushed to one side under load causing position deviation
Solution Approach 1:
The patent replaces the mechanical positioning system with an optical detection system. A camera captures images of markers on medication cassettes, and image processing algorithms calculate actual positions. This substitution eliminates mechanical position deviations caused by rack loading, as the system adapts to actual positions through visual feedback rather than relying on fixed mechanical home positions.
Solution Approach 2:
The patent implements a feedback mechanism where the camera continuously monitors the position of medication cassettes via markers. The control unit processes these images to determine actual positions and adjusts robot arm operations accordingly. This closed-loop feedback system compensates for position deviations caused by rack loading, ensuring accurate medication dispensing despite mechanical position shifts.
2Ease of operation
If the robot arm moves to the home position of the medication cassette, then the positioning is simplified, but the medication cassette cannot be properly gripped or there is a risk of damage
Solution Approach 1:
The patent replaces mechanical home position-based gripping with an optical guidance system. The camera detects the actual position and orientation of the medication cassette marker, and the control unit calculates the precise approach path for the robot arm. This allows the robot arm to safely approach and grip the cassette at its actual position rather than a fixed home position, eliminating gripping failures and damage risks.
Solution Approach 2:
The patent performs preliminary position detection and calculation before the robot arm approaches the medication cassette. The camera captures the marker position in advance, the control unit calculates the actual position and approach trajectory, and only then does the robot arm execute the gripping action. This preliminary action ensures the robot arm is perfectly positioned before contact, preventing gripping failures and cassette damage.
3Productivity
If a large-scale medication packaging device is developed, then the medication dispensing capacity is increased, but the medication cassette cannot be fixed in an accurate position during movement
Solution Approach 1:
The patent replaces mechanical position fixation during movement with an optical tracking system. The camera continuously monitors the marker on the medication cassette throughout the robot arm's movement and transfer operations. The control unit processes these images to track the cassette's actual position in real-time, enabling accurate positioning even in large-scale systems where mechanical fixation is difficult to maintain.
Solution Approach 2:
The patent implements continuous feedback during the medication cassette movement and transfer process. The camera tracks the marker position throughout the robot arm's operations, and the control unit adjusts the movement trajectory based on detected position deviations. This real-time feedback ensures the medication cassette remains accurately positioned during transfer between storage unit and dispensing unit, preventing falling and ensuring precise dispensing in large-scale systems.
Data Source
AI summary
Disclosed herein is a robot arm control system of an automated medication dispensing apparatus, which includes a robot arm; a storage configured to store a mounting position of each of a plurality of medication cassettes, an operation control value of the robot arm for moving to the mounting position, and a reference position at which the marker is attached to each medication cassette in a medication cassette storage unit where a plurality of racks in which the plurality of medication cassettes with markers attached thereto are mounted are arranged; a camera configured to capture the marker attached to the medication cassette; and a control unit configured to control the robot arm to move to a mounting position of any one among the medication cassettes to unload the medication cassette.