Rewinding Machine Web Material Severing Mechanism
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Solution Overview
Problem
Existing continuous peripheral rewinding machines face challenges in efficiently and reliably performing the exchange phase, where the web material is severed and a new core is inserted, often requiring precise and rapid movements that can lead to mechanical wear and irregularities in the finished rolls.
Innovation Solution
A method where the web material is severed by lengthening its path between two rollers, with a new winding core pinching the material to create a free trailing edge of the completed roll and a free leading edge for the new roll, eliminating the need for rapid and precise reciprocal distancing of rollers, thus simplifying control and reducing mechanical wear, and ensuring a better quality product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid and precise reciprocal distancing of rollers is used to sever web material, then exchange phase efficiency is improved, but mechanical wear increases and control complexity increases
Solution Approach 1:
The patent extracts the severing function from the roller reciprocation mechanism. Instead of using rapid roller distancing to sever the web material, the invention allows the web material to be severed by other means (such as a cutting device or natural breaking point), while the rollers perform only the function of maintaining tension and guiding the material. This separation of functions reduces control complexity while maintaining exchange phase efficiency.
Solution Approach 2:
The patent inverts the traditional approach by not using roller reciprocation for severing. Instead, the rollers maintain constant or near-constant positioning while the web material is severed by an alternative mechanism. This inversion eliminates the need for complex synchronized reciprocation control while achieving the same exchange phase objectives.
2Productivity
If rapid and precise reciprocal distancing of rollers is used to sever web material, then exchange phase efficiency is improved, but mechanical wear increases
Solution Approach 1:
The patent removes the severing function from the roller mechanism, preventing the rollers from undergoing rapid reciprocation. This extraction of the cutting function eliminates the mechanical stress and wear that would result from repeated high-speed roller movement, while exchange phase efficiency is maintained through alternative severing methods.
Solution Approach 2:
The patent replaces the mechanical reciprocation-based severing system with an alternative mechanism that does not require rapid roller movement. This substitution could involve a dedicated cutting device, a pre-scored breaking point, or another non-mechanical severing method, thereby reducing mechanical wear on the roller system.
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 method allows for a more controlled and efficient exchange phase, reducing mechanical wear and improving the quality of the finished rolls by maintaining optimal control of the web material during the winding process, ensuring a constant feed speed and minimizing stress on the material.
Implementation Method 1
a new winding core pinching the material to create a free trailing edge of the completed roll and a free leading edge for the new roll
Data Source
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AI summary
A rewinding machine (2) is described with a first winding cradle defined by a first winding roller (1) a second winding roller (3) and a third winding roller (7). The rewinding machine comprises a fourth winding roller (21), defining with the first winding roller (1) and the second winding roller a further winding cradle in which the web material (N) starts winding around a winding core (A2). Winding is completed in the winding cradle formed by first, second and third winding rollers (1, 3, 7).