Conveyor Flight Spacing Control via Low-Torque Actuation
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Solution Overview
Problem
Existing systems for controlling the spacing of objects on a conveyor belt are either complex and slow or prone to damaging objects due to the use of sensor-controlled or non-sensor-controlled stops.
Innovation Solution
The use of pop-up flights on a vertically oriented conveyor belt that transition from a retracted to an extended state to control object spacing, with low-torque actuation to minimize the risk of damage by only opening when an object is not present, ensuring objects are spaced correctly without collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sensor-controlled stops are used to control object spacing, then spacing precision is improved, but system complexity increases and conveyor speed is limited
Solution Approach 1:
The patent extracts the sensing and control functions from the stop mechanism itself. The stop is made passive with no sensors or actuators, while a separate optical sensing system upstream detects objects and controls the timing of stop deployment. This separation eliminates complex sensor-controlled stops while maintaining spacing precision through centralized control.
Solution Approach 2:
The patent replaces mechanical sensor-controlled stops with a hybrid system using optical sensing (non-mechanical) and passive mechanical stops. The optical sensors detect object positions and send signals to control the timing of stop deployment, substituting complex mechanical sensing and actuation with simpler optical detection and timed mechanical response.
2Device complexity
If passive stops are used to control object spacing, then system complexity is reduced, but object damage risk increases
Solution Approach 1:
The patent applies preliminary action by having optical sensors detect objects upstream before they reach the stop zone. The system calculates arrival times and pre-coordinates stop deployment timing, ensuring stops are ready but not yet deployed when objects approach, thereby preventing premature contact and damage.
Solution Approach 2:
The patent implements feedback through optical sensors that continuously monitor object positions and feed this information to the control system. The control system uses this feedback to dynamically adjust stop deployment timing, creating a closed-loop system that responds to actual object positions rather than operating on fixed schedules alone.
3Manufacturing precision
If stops are forced open against present objects, then spacing control is maintained, but object collision and damage occur
Solution Approach 1:
The patent applies dynamics by making the stop deployment timing dynamic rather than fixed. The control system continuously adjusts when stops deploy based on real-time object position data from optical sensors, ensuring stops are deployed at optimal moments when no objects are in the danger zone, thereby maintaining spacing control without collision.
Solution Approach 2:
The patent introduces an intermediary control system that mediates between object detection and stop deployment. This intermediary receives optical sensor data, calculates safe deployment timing, and controls stop actuation, serving as a buffer that prevents direct conflict between objects and stops while maintaining spacing discipline.
Data Source
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AI summary
In one embodiment, apparatus for controlling spacing of objects conveyed by an object conveyor include flights (30.) that can be actuated from a retracted state to an extended state in which the flights extend transversely across the object conveyor (12), the flights limiting travel of the object (0) to control their relative spacing, wherein the flights actuate with relatively little force such that a retracted flight will not extend once it contacts a directly adjacent object that occupies space into which the retracted flight would normally extend.