Self-Aligning Mandrel Assembly With Virtual Pivot Bearing
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Solution Overview
Problem
Mandrel assemblies in can decoration devices often misalign due to cantilevered construction, leading to inconsistent decoration quality and increased machine downtime, as traditional rigid designs are prone to deflection under pressure, requiring precise alignment and frequent maintenance or increased pressure to compensate for misalignment.
Innovation Solution
A mandrel assembly that 'floats' on the mandrel shaft via a bearing assembly creating a virtual pivot point, allowing the mandrel to pivot relative to the shaft, enabling alignment with the blanket axis even if initially misaligned, thus reducing the need for exacting specifications and allowing automatic alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mandrel assembly is constructed with rigid components to control position, then manufacturing precision is improved, but the mandrel assembly becomes prone to deflection under pressure and requires frequent alignment maintenance
Solution Approach 1:
The mandrel assembly is designed with a bearing assembly that allows the mandrel to pivot dynamically relative to the mandrel shaft. This dynamic capability enables the mandrel to automatically adjust and maintain alignment with the blanket axis during operation, eliminating the deflection problems of rigid constructions while maintaining manufacturing precision.
2Manufacturing precision
If increased pressure is applied to compensate for misalignment, then decoration quality is improved, but the service life of mandrel turret disk assemblies is reduced
Solution Approach 1:
The mandrel assembly performs self-alignment through the bearing assembly mechanism. The mandrel automatically pivots to align with the blanket axis under its own weight and operational forces, eliminating the need for external pressure adjustments or frequent maintenance interventions, thereby extending service life while maintaining decoration quality.
3Ease of operation
If the mandrel assembly is cantilevered to allow rotation, then ease of operation is improved, but misalignment occurs due to deflection under pressure
Solution Approach 1:
The bearing assembly acts as an intermediary element between the mandrel and the mandrel shaft. It provides a controlled pivot point that enables rotation while maintaining alignment accuracy, mediating between the rotational movement requirement and the alignment precision requirement.
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
This solution ensures consistent can decoration quality by allowing mandrel assemblies to automatically align with the blanket axis, reducing machine downtime and extending the service life of mandrel turret disk assemblies by eliminating the need for increased pressure and precise alignment.
Implementation Method 1
a bearing assembly structured to define a virtual pivot point to allow the mandrel to pivot relative to the mandrel shaft
Implementation Method 2
the mandrel assembly is structured to draw a vacuum at the distal end whereby a can is held in place
Data Source
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AI summary
A mandrel assembly (50) for a can body (1) can decoration machine is provided. The mandrel assembly (50) includes a bearing assembly (56) that creates a virtual pivot point (100) whereby the mandrel (54) may pivot relative to the supporting mandrel shaft (52). To allow the mandrel (54) to pivot relative to the mandrel shaft (52), the bearing assembly (56) is located at one location and is the only contact point between the mandrel (54) and the mandrel shaft (52).