Cam-Controlled Core Inserter for Surface Winder Reliability
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Solution Overview
Problem
Existing surface winder core insertion systems are prone to variability in speed and reliability due to contamination and fragility, leading to issues such as misalignment, premature release, and jamming, which affect the efficiency and consistency of the winding process.
Innovation Solution
A cam-controlled core inserter with a shaft and cam housings that utilize cam followers and movable fingers to precisely control the insertion of cores into the winding cradle, providing consistent engagement and disengagement, and reducing the impact of contamination and equipment fragility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pusher is used to force the core into position between the winding rollers, then the core insertion speed is improved, but the core may be dented in the winding zone and produce a faulty winding
Solution Approach 1:
The core insertion mechanism is divided into multiple fingers (typically 3-5 fingers) that are distributed around the core circumference. Each finger independently contacts and guides the core, distributing the insertion force across multiple contact points rather than concentrating it at a single pusher point, thereby preventing core denting while maintaining insertion speed.
Solution Approach 2:
The fingers are designed to be movable rather than fixed, allowing them to dynamically adjust their position and orientation during the insertion process. This dynamic adjustment enables the fingers to accommodate core variations and guide the core smoothly into the winding zone without applying excessive localized force that would cause denting.
2Manufacturing precision
If a set of cradles with different curvatures is used for each different diameter of the core, then the core insertion precision is improved, but the device complexity and production stops for adjusting work increase
Solution Approach 1:
The finger assembly is designed as a universal mechanism that can accommodate cores of different diameters without requiring multiple specialized cradles. The movable fingers can adjust their spacing and orientation to fit various core sizes, allowing a single device to perform multiple functions across different core specifications.
Solution Approach 2:
The fingers are designed with adjustable positioning mechanisms that allow dynamic reconfiguration of the finger assembly geometry. This enables the same physical device to adapt to different core diameters by adjusting finger spacing and angles, eliminating the need for multiple fixed-curvature cradles while maintaining insertion precision.
3Speed
If pneumatically activated fingers are used to grip and translate the core to the winding zone, then the core insertion speed is improved, but the reliability decreases due to contaminants and design fragility
Solution Approach 1:
The patent replaces the pneumatic activation system with a mechanical drive system. Instead of using compressed air to actuate the fingers, a mechanical motor and transmission system directly drives the finger assembly. This substitution eliminates the fragility and contamination susceptibility of pneumatic components while maintaining the ability to achieve controlled, high-speed core insertion.
4Productivity
If the core is inserted without precise control, then the production speed is maintained, but the variability in speed and consistency of insertion increases due to contamination and fragility
Solution Approach 1:
The finger assembly incorporates sensors and control mechanisms that provide feedback on core position, finger engagement force, and insertion progress. This feedback enables real-time adjustments to maintain consistent insertion performance despite variations in core properties or environmental conditions, ensuring both high speed and high reliability.
Solution Approach 2:
The movable fingers are designed to dynamically adapt their position and force application during insertion. This dynamic control allows the system to maintain consistent insertion performance across varying production conditions, preventing the speed variability and inconsistency that plague rigid, non-adaptive systems.
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 cam-controlled core inserter enhances the reliability and consistency of core insertion, reduces downtime, and improves the overall efficiency of the winding process by maintaining precise control over core placement and release, thereby minimizing jams and web breaks.
Implementation Method 1
A cam follower is cooperatively associated with each of the cams and has a finger shaft attached thereto that is disposed through a respective fixed finger plate cooperatively associated thereto and has a movable finger attached thereto. Each of the cam followers orbit about the longitudinal axis while juxtaposed proximate to and in contacting engagement with the respective cam cooperatively associated thereto.
Data Source
AI summary
A cam-controlled core inserter for a surface winder is disclosed. The cam-controlled core insertion device provides for a shaft having a plurality of cam housings disposed thereabout. A cam cooperatively associated with a respective cam housing is disposed within a first surface of each of the cam housings. A fixed finger plate cooperatively associated with a respective cam housing and having a fixed finger fixably attached thereto is juxtaposed proximate to each of the cam housings and fixably attached to the shaft. A cam follower having a finger shaft that has a movable finger attached thereto is cooperatively associated with each of the cams. The distal end of each of the movable fingers and the distal end of each of the fixed fingers are capable of forming a space therebetween for contacting engagement and containment of a core suitable for the convolute disposal of a web material thereabout.