Thread Cutting Device for Ribbon Rolls
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Solution Overview
Problem
Existing cutting devices for rolls of ribbon-like material, such as paper rolls, require continuous sharpening, produce sparks and slag, have large dimensions, and result in high maintenance and commercialization costs, potentially damaging the cut pieces and compromising hygiene in sanitary applications.
Innovation Solution
A cutting device utilizing thread-like cutting elements that are mobile and operatively commutable, eliminating the need for continuous sharpening, and featuring a pulley system for efficient movement and cutting, thereby avoiding spark and slag production and reducing device size and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If circular cutting blades with teeth are used to cut rolls, then cutting effectiveness is improved, but continuous sharpening is required producing sparks and slag
Solution Approach 1:
The patent replaces traditional mechanical circular cutting blades with a band cutting system that uses a moving band with cutting edges. This substitution eliminates the need for continuous sharpening operations that produce sparks and slag, while maintaining effective cutting performance through the band's linear motion and cutting edge geometry.
Solution Approach 2:
The invention changes the cutting mechanism from rotational circular blades to a linear moving band system. By altering the motion parameter from rotational to linear, the system eliminates contact with sharpening devices that generate harmful sparks and slag, while the band's continuous movement maintains cutting effectiveness.
2Productivity
If circular cutting blades are used, then cutting action is enhanced, but device dimensions and bulk increase
Solution Approach 1:
The patent substitutes large-diameter circular cutting blades with a narrow moving band system. This replacement dramatically reduces the volume and bulk of the cutting mechanism while preserving cutting action through the band's linear motion and concentrated cutting edges, allowing for more compact device design.
3Strength
If thick cutting blades are used, then cutting strength is improved, but damage to roll structure increases
Solution Approach 1:
The invention employs a thin, flexible band as the cutting element instead of thick rigid blades. This thin band applies cutting force with minimal intrusion into the roll structure, preventing damage while maintaining sufficient cutting strength through the band's tensile properties and cutting edge sharpness.
Solution Approach 2:
The patent replaces thick rigid cutting blades with a flexible moving band system. This substitution allows the cutting element to conform to the roll surface and apply force more evenly, maintaining cutting strength while minimizing structural damage to the being-cut material.
4Reliability
If continuous sharpening devices are associated with cutting blades, then cutting performance is maintained, but device complexity increases
Solution Approach 1:
The invention replaces the complex system of circular blades requiring continuous sharpening with a moving band system that does not require sharpening. This substitution eliminates the associated sharpening devices and their complexity while maintaining reliable cutting performance through the band's continuous replacement or regeneration capability.
Solution Approach 2:
The patent adopts a disposable or regenerable band cutting element instead of expensive, long-lived circular blades requiring maintenance. The band can be easily replaced or regenerated without complex sharpening operations, reducing device complexity while ensuring consistent cutting performance throughout operation.
Data Source
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AI summary
The present invention concerns a cutting device for rolls of ribbon-like material. The device 1 comprises cutting means (2) active on at least one roll (3) in order to divide this latter in two or more pieces (5). The cutting means (2) are commutable between a non operative condition, in which they do not act on the roll (3), and an operative condition, in which they transversally cut the roll (3). The cutting means (2) comprise a thread-like cutting element (6) which develops transversally to the roll (3). The cutting thread (2) is mobile along its longitudinal development so as to cut the roll (3). The cutting means comprise at least one handling member (7), preferably two pulleys (7a, 7b) operatively associated to the thread-like cutting element (6) to move this latter along its longitudinal development.