Rewinding Machine Tearing Mechanism for Core Deformation
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Solution Overview
Problem
Current rewinding machines face significant drawbacks, including the need to stop and reconfigure for different core diameters, causing downtime, and the generation of vibrations that can lead to malfunctions and core deformation during the tearing process, resulting in imperfect winding.
Innovation Solution
A rewinding machine design featuring a sliding surface for the continuous strip, a support surface for the core, and a contrast unit with a tearing tooth that rotates at a speed matching the contrast surface, allowing for precise tearing without deforming the core or master roller, and enabling easy adaptation to various core diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating tooth is used to tear the continuous strip by impacting the master roller, then the tearing function is achieved, but vibrations are generated that can cause malfunctions and deform the master roller
Solution Approach 1:
The harmful impact action is extracted from the master roller system and transferred to a dedicated tearing tooth that rotates independently on its own axis. The tearing tooth is driven by a motor and transmits force to the continuous strip through a tearing element, separating the tearing function from the master roller to eliminate vibrations affecting the roller and other machine components.
2Manufacturing precision
If the cradle is fixed for a specific core diameter, then the winding precision is maintained, but the machine must be stopped and reconfigured when changing core diameters
Solution Approach 1:
The cradle is transformed from a fixed structure to a dynamic, adjustable structure. The cradle can be moved vertically along the master roller axis and locked at different positions to accommodate various core diameters. This dynamic adjustment capability allows the machine to maintain precise winding for different core sizes without requiring complete reconfiguration or stopping the machine for extended periods.
3Reliability
If the core is pressed against the strip with high pressure to ensure tearing, then the tearing effectiveness is improved, but the core is deformed which results in incorrect winding
Solution Approach 1:
A tearing element is introduced as an intermediary between the tearing tooth and the core. The tearing element contacts the continuous strip and transmits the tearing force, preventing direct contact between the tearing tooth and the core. This intermediary mechanism ensures effective tearing of the strip while avoiding deformation of the core, maintaining both tearing effectiveness and core shape integrity.
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 prevents vibrations and deformations, ensures precise and constant tearing, and allows for seamless adaptation to different core diameters, achieving perfect winding without downtime or mechanical stress.
Implementation Method 1
a contrast unit defining a contrast surface having a different speed from the speed of the sliding surface and arranged between the support surface and the contrast surface; and a tearing tooth suitable to press the continuous strip against the contrast surface causing the tearing of said continuous strip
Data Source
AI summary
Provided is a rewinding machine including a winding zone wherein a continuous strip is wound around a core; a movement unit of the continuous strip defining a sliding surface for the continuous strip; a support unit defining a support surface for the core; the support surface is opposite and spaced from the sliding surface so as to define a sliding channel, configured to guide the core in the winding zone; a contrast unit defining a contrast surface; and a tearing tooth configured to press the continuous strip against the contrast surface causing the tearing of the continuous strip; said sliding surface being interposed between the support surface and the contrast surface.