Bearing Journal Geometry for Jam-Free Roll Alignment

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Solution Overview

Problem

Existing bearing journals for material webs, such as household and sanitary paper rolls, often jam in dispensers due to inadequate clearance, leading to incorrect insertion and stability issues, especially when force is applied.

Innovation Solution

A bearing journal with a rotating surface, a non-rotating fitting surface, and an axial guide surface, featuring a circumferential groove or tooth-like projections, which engages with angled guide surfaces in the dispenser to prevent jamming and ensure correct alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If sufficient clearance is provided between bearing journals and guides, then jamming is avoided and rolls can move easily, but clearance becomes so great that rolls can be inverted or wrong rolls inserted

Engineering Contradiction:

Improveease of movement of rolls in guidesVSAvoidcorrect arrangement of rolls

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The bearing journal is designed with an asymmetric profile featuring a first section with a first diameter and a second section with a second diameter that is smaller than the first diameter. The guide correspondsingly has a first section and a second section with different diameters. This asymmetric design allows the bearing journal to be inserted only in the correct orientation, preventing inversion or incorrect insertion, while still providing sufficient clearance for easy movement.

Inventive Principle:

Principle #4Asymmetry

2Ease of manufacture

If bearing journals are made with inexpensive materials for low-value material webs, then cost is reduced, but stability and strength are insufficient to withstand forceful incorrect insertion attempts

Engineering Contradiction:

Improvecost of bearing journalsVSAvoidstrength to withstand incorrect insertion

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The asymmetric design of the bearing journal and guide creates a preliminary preventive mechanism that stops incorrect insertion before force is applied. The geometric constraint ensures that even inexpensive materials are sufficient, as the design prevents forceful incorrect insertion attempts from succeeding in the first place.

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If control elements and recesses are added to prevent incorrect insertion, then reliability of correct allocation is improved, but device complexity increases

Engineering Contradiction:

Improvecorrect allocation of bearing journals and guidesVSAvoidcomplexity of bearing journal structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The asymmetric profile of the bearing journal serves multiple functions simultaneously: it provides the bearing surface for rotation, creates the geometric constraint for correct orientation, and eliminates the need for separate control elements and recesses. This multi-functional design achieves reliable correct allocation while keeping the structure simple.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS7828240B2Bearing journal for supporting a material web

Publication Date: 2010.11.09 HAGLEITNER HANS GEORG

AI summary

A bearing journal projects from an end of a material web wound into a roll. The bearing journal has a bearing surface formed as a rotating surface, a fitting surface not formed as a rotating surface, and an axial guide surface. A dispensing system includes a dispenser that is adapted to receive the roll of web material and to cooperate with the bearing journal.