Rotatable Bearing Journal for Coreless Roll Support Spindles
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Solution Overview
Problem
Existing support rod systems for coreless paper rolls require multiple bearing journals and complex assembly/disassembly processes, especially when refilling, due to non-rotational symmetry and specific guide configurations in dispensers.
Innovation Solution
The support rod design features a first part with an axial bore and a rotating body with latching lugs and resilient tongues, allowing for simplified use in various dispenser configurations with either one or two bearing journals, and a tapered first part with a flange for secure insertion and rotation, accommodating different dispenser guides and coding surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple bearing journals are used in the support rod system, then the system can accommodate various dispenser configurations, but the device complexity and assembly/disassembly process become more complex
Solution Approach 1:
The support rod is designed with a universal structure that can function with different dispenser configurations. The rotatable bearing journal can be positioned at different locations (first end, second end, or both) to accommodate various dispenser types including those with coded guides, guide bars, grooves, or bearing projections, eliminating the need for multiple specialized bearing journals
Solution Approach 2:
The bearing journal is made rotatable relative to the support rod, allowing it to dynamically adapt to different dispenser configurations. This rotatability enables the same bearing journal design to work with various guide types without requiring complex fixed positioning mechanisms
2Adaptability or versatility
If bearing journals are made non-rotationally symmetrical for coded guides, then compatibility with specific dispenser coding is improved, but the ease of operation during refilling deteriorates
Solution Approach 1:
The bearing journal is designed to rotate relative to the support rod, allowing it to dynamically align with coded guides during insertion while maintaining ease of operation. The rotation capability enables the bearing journal to accommodate non-rotationally symmetrical coding surfaces without requiring precise orientation during refilling
Solution Approach 2:
The bearing journal can have non-rotationally symmetrical surfaces that correspond to coding surfaces on dispensers. These asymmetric surfaces engage with ribs or grooves on dispenser side walls to ensure proper orientation, while the rotatability maintains ease of operation
3Ease of manufacture
If the support rod uses a simple design with fewer components, then manufacturing cost is reduced, but the reliability of securing bearing journals deteriorates
Solution Approach 1:
The support rod is divided into distinct segments: a first part that can be inserted axially into the roll, and a rotatable bearing journal assembly. This segmentation allows each component to be optimized independently while maintaining overall simplicity and reliability of the connection
Data Source
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AI summary
A spindle for a material web wound to form a coreless roll (3) is provided at least at one end with a bearing journal (5) which protrudes from the roll (3), and the journal (5) is provided on a rotary body (12) which can form a snap connection in the bore (14) of the spindle (1) inside the roll (3).