Strawberry Capping via Concave Rollers and Vision
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Solution Overview
Problem
The strawberry processing industry faces challenges with labor-intensive and unsafe manual capping of strawberries, as existing mechanical solutions are either too aggressive or fail to integrate all necessary tasks effectively, leading to fruit damage and inefficiency.
Innovation Solution
An automated capping system utilizing a conveyor belt with concave slotted rollers to orient strawberries without mechanical grasping, combined with computer vision for precise cutting, allowing strawberries to be aligned and capped without device-to-device transfers, ensuring minimal waste and efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual capping is used, then labor flexibility is maintained, but labor intensity and safety risks increase significantly
Solution Approach 1:
The strawberry's own shape and the roller's geometry work together to automatically orient the fruit. The concave roller contours match the strawberry shape, causing the strawberry to self-align during rotation without requiring external manipulation or complex positioning mechanisms.
Solution Approach 2:
The patent replaces manual mechanical grasping and positioning with a passive mechanical system using concave rollers that use friction and geometry to orient strawberries. The cutting action is automated through a blade mechanism triggered by the oriented position, eliminating the need for human hands and judgment.
2Manufacturing precision
If mechanical grasping is used to orient strawberries, then orientation control improves, but fruit damage increases
Solution Approach 1:
The strawberry's own shape and the roller's geometry work together to automatically orient the fruit. The concave roller contours match the strawberry shape, causing the strawberry to self-align during rotation without requiring external manipulation or complex positioning mechanisms.
Solution Approach 2:
The concave roller acts as an intermediary between the strawberry and the cutting blade. It provides a gentle interface that orients the strawberry through friction and geometry rather than direct grasping, then positions it precisely for cutting without applying damaging forces.
3Device complexity
If device-to-device transfers are implemented, then process integration improves, but orientation loss occurs
Solution Approach 1:
The patent combines multiple functions (orientation, positioning, and cutting) into a single integrated station. The concave roller both orients the strawberry and holds it in position during the cutting operation, eliminating the need to transfer the fruit between different devices and maintaining orientation throughout the process.
Solution Approach 2:
The concave roller serves multiple functions: it orients the strawberry through its geometry, maintains orientation during transit, positions the fruit for cutting, and supports the fruit during the cutting operation. This multi-functionality eliminates the need for separate devices for each task.
4Productivity
If aggressive cutting mechanisms are used, then cutting speed increases, but fruit waste increases
Solution Approach 1:
The system uses vision feedback to locate the calyx position and determine the optimal cutting plane. This information feeds back to position the cutting blade precisely, ensuring that only the necessary portion (the calyx) is removed while maximizing fruit recovery and minimizing waste.
Solution Approach 2:
The cutting action is localized precisely to the calyx region based on vision system identification. The blade is positioned to cut only where needed, rather than using aggressive blanket cutting methods that would remove excessive fruit material. The local quality of the cut matches the local requirement of removing only the calyx.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables high-speed, efficient, and sanitary strawberry capping, reducing labor costs and fruit loss, while maintaining the integrity of the fruit, and can be adapted for other produce forms.
Implementation Method 1
The fruit nestles between adjacent rollers which rotate in a first portion of the conveyor to cause the strawberries to align their long axis with that of the rotating roller
Implementation Method 2
An imaging system is utilized to determine which way the strawberry faces and its position on the roller in relation to the underlying slots
Data Source
Figure 1A
Figure 1B
Figure 2~3
AI summary
An automated apparatus for removing the tops (calyx) of strawberries as they move along a conveyor belt having a plurality of concave-shaped slotted rollers which operate to orient the calyx of each strawberry for being cut. Images are captured and processed for locating the calyx of each strawberry and determining an optimal cutting plane. In response to the image processing a control system actuates a blade in a cutting apparatus to pass through the produce item and into one of the slots in a roller, or rollers, to separate the calyx from the body of the strawberry.