Rotary Drum Cap Singulation Mechanism
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Solution Overview
Problem
Existing automated pharmaceutical dispensing systems, such as those described in U.S. Pat. No. 6,971,541, face issues with dispensing multiple caps at once due to edge features on child-resistant caps that can tangle or interlock, leading to inconsistent cap singulation and potential dual cap dispensing.
Innovation Solution
A cap dispensing device featuring a drum assembly with radially extending wings and a separation structure, allowing for consistent singulation of caps by ensuring only one cap passes through the exit aperture while preventing interlocked caps from being dispensed simultaneously, utilizing a rotary drive unit to rotate the drum and a mounting structure with an exit aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple hopper with drum rotation is used for cap dispensing, then the device complexity is low, but multiple caps may be dispensed at once due to interlocking edge features
Solution Approach 1:
The drum is segmented into multiple compartments that each hold a single cap. This segmentation prevents caps from interlocking and ensures that only one cap can be dispensed at a time from each compartment, resolving the reliability issue while maintaining relatively simple device complexity.
Solution Approach 2:
A cap gate mechanism acts as an intermediary between the drum compartments and the dispensing aperture. The gate controls cap release, allowing only one cap to pass through at a time, thereby preventing multiple caps from being dispensed simultaneously while maintaining system reliability.
2Ease of operation
If caps are allowed to tumble freely in the hopper, then the ease of operation is high, but caps may become interlocked and fail to singulate properly
Solution Approach 1:
Caps are pre-oriented in the drum compartments during the loading process before dispensing begins. This preliminary orientation ensures that caps are positioned correctly with their open ends facing the dispensing direction, preventing interlocking and ensuring consistent singulation while maintaining ease of operation.
Solution Approach 2:
The drum compartments provide a controlled local environment for each cap, restricting their movement and orientation to specific positions. This local control ensures that each cap maintains the correct orientation without requiring complex global control mechanisms, balancing ease of operation with manufacturing precision.
3Manufacturing precision
If a grooved hopper design is used to guide caps, then the manufacturing precision for cap orientation is improved, but the device complexity increases
Solution Approach 1:
Instead of using complex grooved structures in the hopper, the system segments caps into separate drum compartments. This segmentation achieves precise cap orientation control without requiring complex hopper grooves, thereby improving manufacturing precision while avoiding increased device complexity.
Solution Approach 2:
The orientation control function is extracted from the hopper structure and transferred to the drum compartment design. By taking out the orientation control requirement from the hopper, the system achieves precise cap orientation with a simpler hopper structure, resolving the contradiction between manufacturing precision and device complexity.
Data Source
AI summary
A device for singulating open-ended objects includes: a housing configured to retain a plurality of open-ended objects, the housing having an open lower end; an outer ring positioned below the housing; a drum positioned within the outer ring to form a drum assembly, the drum including a hub having a substantially circular wall and a plurality of wings that extend radially outwardly from the wall to contact the outer ring, the hub, wings and outer ring forming a plurality of gaps; a mounting structure with an exit aperture fixed relative to the housing; and a rotary drive unit mounted to the drum that rotates the drum about an axis of rotation. The presence of the wings can enable the device to singulated caps more consistently.