Self-adjusting pinch rollers for stretch-wrapping film alignment
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Solution Overview
Problem
Existing stretch-wrapping machines often suffer from misalignment issues between pinch rollers and pre-stretch rollers, leading to gaps in film contact, which results in suboptimal pre-stretch and potential slipping, due to imprecise manufacturing or installation.
Innovation Solution
The implementation of self-adjusting pinch rollers with flexible-connection assemblies that allow them to pivot and align with pre-stretch rollers, ensuring consistent film contact across the entire width, using deformable elastomeric members to compensate for misalignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid pinch rollers are used in stretch-wrapping machines, then the structure is simple and manufacturing is easy, but misalignment between pinch rollers and pre-stretch rollers causes gaps in film contact, resulting in suboptimal pre-stretch and potential slipping
Solution Approach 1:
The pinch roller assembly is made dynamically adjustable through a positioning mechanism that allows the pinch roller to be repositioned relative to the pre-stretch roller. This enables the system to adapt to misalignment conditions by adjusting the roller position, ensuring consistent film contact across the entire film width while maintaining a relatively simple overall structure.
2Manufacturing precision
If imprecise manufacturing or installation occurs, then production costs are reduced and assembly is simplified, but misalignment between rollers occurs, leading to gaps in film contact and suboptimal pre-stretch performance
Solution Approach 1:
The roller positioning mechanism is designed to be self-adjusting, allowing the pinch roller to automatically align with the pre-stretch roller during operation or through simple manual adjustment. This self-service capability compensates for manufacturing tolerances and installation variations without requiring high-precision manufacturing or complex alignment procedures, thereby maintaining ease of manufacture while improving alignment precision.
3Ease of operation
If the pinch roller is fixed in position, then the mechanism is simple and maintenance is easy, but it cannot compensate for misalignment, resulting in inconsistent film contact across the film width
Solution Approach 1:
The positioning mechanism provides dynamic adjustability of the pinch roller position while maintaining operational simplicity. The mechanism allows for easy adjustment of the roller position to compensate for misalignment, ensuring consistent film contact across the entire film width without complicating the operation or maintenance procedures.
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 solution ensures the film is properly pre-stretched across its entire width, enhancing the wrapping process by maintaining consistent contact with pre-stretch rollers and preventing slipping, resulting in a more secure and evenly wrapped product.
Implementation Method 1
a first biasing element biasing the first pinch roller to an engaged position
Data Source
AI summary
Various embodiments of the present disclosure provide a stretch-wrapping machine with self-adjusting pinch rollers configured to reorient themselves to compensate for misalignment relative to their respective pre-stretch rollers. This ensures the pinch rollers press the entire width of the film against their respective pre-stretch rollers as the film is drawn through the rollers.