Adjustable-angle nip roll with offset pivot lever
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Solution Overview
Problem
Existing angle-adjustable pressure or nip rollers in film production systems face difficulties in threading material webs due to limited directional adjustment and contact point flexibility, leading to issues like air bubble trapping, force distribution inefficiencies, and micro-scratches.
Innovation Solution
The angle-adjustable pressure or nip roller is designed with an offset adjustment axis and a stop-limited, two-armed lever mechanism, allowing for flexible positioning and force application relative to the process roller, enabling easier web threading and optimized contact points to prevent air bubbles and micro-scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pressure roller is rotatably mounted to be adjustable around the process roller with the pivot mechanism mounted on the axle mount of the process roller, then the pressure roller can be moved in the direction of the web surface that is already in contact, but the material web threading becomes extremely difficult both manually and mechanically
Solution Approach 1:
Instead of mounting the pivot mechanism on the process roller axle mount (conventional approach), the invention inverts the mounting location to a separate bracket positioned away from the process roller. This allows the pressure roller to be adjusted from a different spatial location, enabling web threading without the constraints of the conventional mounting approach.
Solution Approach 2:
The invention introduces angular adjustment capability in addition to the existing linear movement capability. The pressure roller can now be adjusted not only in the direction of the web surface (one dimension) but also in angular positions (another dimension), providing two-dimensional adjustment freedom that facilitates easier web threading.
2Device complexity
If the pressure roller is adjusted with limited directional movement, then the structure remains simple, but air bubbles can be trapped between the film and the process roller
Solution Approach 1:
The invention transforms the static or limited-adjustment pressure roller into a dynamically adjustable component. The pressure roller can now be adjusted in multiple directions (linear and angular) to optimize contact with the web surface, ensuring complete contact that prevents air bubble trapping while maintaining structural simplicity.
3Device complexity
If the pressure roller has fixed contact points on the process roller, then the structure is simple, but force distribution becomes inefficient and causes micro-scratches
Solution Approach 1:
The invention allows preliminary adjustment of the pressure roller's angular position and contact point before the web threading process begins. This preliminary positioning ensures optimal force distribution from the start, preventing micro-scratches and improving web surface quality without requiring complex real-time adjustment mechanisms.
Data Source
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AI summary
An improved adjustable-angle pressing or nip roll is distinguished, inter alia, by the following features: the angle adjusting device (WE) comprises a double-armed lever (7.1, 7.2), - the moving device (VF) is constructed in such a way that, via this, a pivot axis (8) of the double-armed lever (7.1) can be adjusted relative to the process roll (2), and the angle adjusting device (WE) comprises, for the double-armed lever (7.1, 7.2), a stop (9.1, 9.2) which acts at least on one side, in such a way that, in the case of further force loading by the force actuating unit (10), a pressing force (FR) can be generated which acts on the pivot axis (8) of the double-armed lever (7.1, 7.2) and via which the pressing or nip roll (3, 4) can be pressure-loaded onto the roll shell (21) of the process roll (2) with the material web (F) being guided through between the two rolls (3, 4; 2).