Transfer Starwheel With Compliant Inserts For Shaped Containers
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Solution Overview
Problem
Conventional transfer starwheels are ineffective in handling shaped containers due to difficulties in accurate positioning and minimizing vacuum leakage, requiring costly reconfiguration or replacement when can geometry changes, and fail to maintain stability across varying machine speeds.
Innovation Solution
A transfer starwheel assembly with compliant inserts formed from materials like rubber or polyurethane, which define the shape of the recesses to accommodate varying container shapes, combined with a mounting hub featuring multiple sets of vacuum openings for adjustable axial positioning, ensuring secure holding and efficient transfer of containers between processing turrets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional rigid starwheel recess is used to handle shaped containers, then the manufacturing cost increases due to costly reconfiguration or replacement when can geometry changes, but the handling effectiveness deteriorates due to difficulties in accurate positioning and minimizing vacuum leakage
Solution Approach 1:
The starwheel recess is segmented into a rigid base structure and removable compliant inserts. The inserts can be independently replaced or adjusted without replacing the entire starwheel, reducing manufacturing costs while maintaining handling effectiveness for different container shapes
Solution Approach 2:
The compliant inserts are made from elastomeric materials with specific durometer ranges (40-70 Shore A) that can be selected based on container geometry. This parameter adjustment allows the same starwheel to effectively handle various shaped containers by changing insert properties rather than replacing the entire component
2Measurement precision
If the starwheel recess is machined to match the can profile exactly, then the positioning accuracy improves, but the device complexity and cost increase significantly
Solution Approach 1:
Instead of machining the entire starwheel recess to match the can profile, only the compliant insert portion is shaped to conform to the container geometry. The rigid starwheel body maintains a standard simple geometry, reducing device complexity while the localized insert provides the necessary positioning accuracy
Solution Approach 2:
The compliant insert acts as an intermediary between the rigid starwheel and the shaped container. It provides the profile-matching function without requiring the starwheel itself to be complex, thereby achieving positioning accuracy while keeping device complexity low
3Stability of the object's composition
If a higher vacuum is applied to prevent can migration, then the axial stability improves, but the energy consumption and operating costs increase
Solution Approach 1:
The elastomeric inserts with specific durometer properties (40-70 Shore A) provide friction-based stabilization that reduces can migration. This allows the system to maintain axial stability at lower vacuum levels, reducing energy consumption compared to systems that rely solely on high vacuum
4Manufacturing precision
If the starwheel is reconfigured or replaced when can geometry changes, then the handling precision is maintained, but the productivity decreases due to frequent stoppages
Solution Approach 1:
The modular design with removable inserts allows quick changes between different container geometries by simply swapping inserts rather than reconfiguring or replacing the entire starwheel, maintaining handling precision while minimizing production stoppages
Solution Approach 2:
The system is designed to be dynamically adaptable to different container shapes through interchangeable inserts. This allows the starwheel to maintain optimal handling precision for various geometries without requiring frequent complete replacements, thereby sustaining productivity
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 solution provides improved axial stability and accurate positioning of shaped containers, reducing vacuum leakage and enabling efficient transfer across a range of machine speeds without the need for frequent starwheel replacement, thus enhancing operational flexibility and reducing costs.
Implementation Method 1
Vacuum is used to secure the can in the recess against gravity and/or centrifugal force as the starwheel rotates
Implementation Method 2
each recess includes a vacuum port and at least one insert formed from a compliant material... The article is held in the recess between the first position and the second position by the shape of the recess and the vacuum at the vacuum port
Data Source
Figure 1
Figure 2~3A
Figure 3B~4
AI summary
A transfer assembly (300) includes a transfer starwheel having recesses (310) to receive an article (2). Each recess (310) includes a vacuum port (324) and at least one insert (330) formed from a compliant material. The at least one insert at least partially defines a shape of the recess (310), which corresponds to an aspect of the article. The transfer assembly includes a mounting hub (400) including a plurality of circumferential sets of vacuum openings (456) extending axially along the mounting hub (400) and coupled to a vacuum source. A vacuum is delivered to the vacuum openings. The transfer starwheel (300) is mounted on a mounting hub (400) to align the vacuum ports (324) of the transfer starwheel with a selected set of vacuum openings (456) on the mounting hub. The mounting hub (400) rotates so that the transfer starwheel receives the article into one of the recesses (310) at a first position and rotates to a second position while holding the article (2) with the vacuum.