Mandrel Cupping Assembly for Web Rewinding Vibration Control
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Solution Overview
Problem
Conventional web rewinding machines face issues with mandrel vibration and wobble during loading and unloading, leading to inefficient core attachment and potential damage to the chuck arm mechanism, requiring complex and numerous moving parts for operation.
Innovation Solution
A simplified mandrel cupping assembly with fewer moving parts, utilizing a turret system where the mandrel cup is rotated independently with its respective mandrel, and a dual-actuator system for engaging and disengaging cupping arms to support and release the mandrel ends, allowing for easier core loading and unloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional mandrel cupping assembly with multiple moving parts is used to support mandrels, then the mandrels can be supported during winding, but the complexity of the device increases and maintenance needs increase
Solution Approach 1:
The mandrel cupping assembly is divided into separate functional components: a mandrel cup that rotates independently with the mandrel, and a stationary actuator mechanism. This segmentation allows the cup to follow the mandrel's motion while the actuator remains fixed, reducing the complexity of moving parts while maintaining support reliability.
Solution Approach 2:
The patent extracts the mandrel support function from the traditional multi-component cupping assembly and implements it through a simplified mechanism where the mandrel cup rotates independently. This extraction eliminates the need for complex linkages and multiple actuators, reducing device complexity while preserving the essential support function.
2Stability of the object's composition
If the mandrel is supported throughout the entire rotation cycle, then vibration and wobble are minimized, but core loading and unloading operations become difficult
Solution Approach 1:
The mandrel cup is designed to be dynamically controllable, transitioning between an engaged position (providing support during winding) and a disengaged position (allowing core loading and unloading). The actuator mechanism enables smooth transitions between these states, providing stability when needed while facilitating operation when required.
Solution Approach 2:
The actuator mechanism is positioned and configured in advance to enable smooth engagement and disengagement of the mandrel cup. The stationary actuator is pre-positioned relative to the rotating mandrel cup, allowing for controlled interaction at appropriate moments in the rotation cycle without requiring complex real-time adjustments.
3Stability of the object's composition
If the mandrel cup is engaged at all times, then the mandrel is stable during winding, but the chuck arm mechanism suffers from excessive vibration and wobble during loading and unloading
Solution Approach 1:
The mandrel cup's engagement state is dynamically adjusted based on the operational phase. During winding, the cup is engaged to provide stability. During loading and unloading, the cup is disengaged to allow the mandrel to be freely manipulated, eliminating vibration and wobble issues. The actuator mechanism enables these dynamic transitions.
Solution Approach 2:
The patent extracts the mandrel support function from continuous engagement and implements it through controlled engagement only when needed. By separating the support function from the loading/unloading operations, the system eliminates the harmful vibrations and wobbles that occur when the mandrel is constrained throughout the entire cycle.
4Reliability
If a complex chuck arm mechanism is used to actuate the mandrel cup, then the mandrel can be supported reliably, but the number of moving parts increases and maintenance needs increase
Solution Approach 1:
The patent extracts the actuation function from a complex multi-component chuck arm mechanism and implements it through a simple stationary actuator. This actuator uses basic mechanical elements (linkages, cams, or direct drives) that are easier to manufacture, operate, and maintain, while still providing reliable control of the mandrel cup engagement.
Solution Approach 2:
The actuator mechanism is designed to be self-contained and stationary, eliminating the need for complex moving parts that require maintenance. The simple mechanical design allows for easier repair and reduced maintenance needs compared to traditional multi-component chuck arm mechanisms.
Data Source
AI summary
A process for winding a web substrate is disclosed. The process provides the steps of: (a) providing a turret assembly having a plurality of mandrels each having an unsupported end; (b) providing a mandrel cupping assembly for releasably engaging the unsupported ends of each mandrel; (c) driving the turret assembly about a closed mandrel path; (d) indexibly rotating a first mandrel to a first position; (e) disposing a core upon the mandrel; (f) connectively engaging a first cupping arm with the unsupported end of the mandrel with an actuator; (g) engaging a web substrate to the core; (h) disposing the web substrate about the core; (i) indexibly rotating the mandrel to a second position; (j) disengaging the cupping arm from the mandrel at the second position; and, (k) removing the core and the convolutely wound web material from the mandrel.