Dispensing system, refill for a dispenser, and support bar for a dispenser roll
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Solution Overview
Problem
Existing dispensing systems for material webs, such as domestic roll paper and sanitary roll paper, face issues with the stability and strength of bearing journals, which can lead to damage during incorrect insertion attempts, and require complex rotation mechanisms for proper alignment.
Innovation Solution
A dispensing system with a support bar having bearing journals with non-rotation surfaces, where one journal has a groove that aligns with a projecting ridge guide in the dispenser, allowing for simplified and stable insertion and rotation, ensuring the material web is drawn off with controlled torque, reducing the risk of damage and material wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bearing journals are made with rotation surfaces for alignment, then ease of operation is improved, but device complexity increases due to rotation mechanisms
Solution Approach 1:
The bearing journal is designed with an asymmetric groove pattern that does not form a complete rotation surface. The groove is positioned at a specific angular location and extends only partially around the journal circumference, creating an asymmetric feature that aligns with a corresponding asymmetric guide ridge in the dispenser. This asymmetry enables automatic alignment during insertion without requiring complex rotation mechanisms, as the groove-ridge interface naturally orients the journal correctly when inserted.
2Ease of manufacture
If bearing journals use cost-effective materials, then manufacturing cost is reduced, but strength and stability deteriorate leading to damage during incorrect insertion
Solution Approach 1:
The bearing journal incorporates a groove that creates a controlled weakness or stress relief feature. This groove acts as a predetermined stress concentration point that can absorb or redirect forces during incorrect insertion attempts. The groove design allows the journal to deform or deflect in a controlled manner rather than fracturing, providing beforehand cushioning against damage from misuse while maintaining overall structural integrity.
3Manufacturing precision
If bearing journals have mating surfaces for alignment, then manufacturing precision is improved, but ease of manufacture deteriorates due to tighter tolerances
Solution Approach 1:
Instead of providing complete rotation surfaces around the entire bearing journal, the groove is localized to a specific angular sector. This localized groove provides sufficient alignment information for correct orientation without requiring high-precision mating surfaces over the full 360 degrees. The groove depth and angular position are controlled to provide adequate alignment, while the rest of the journal surface can be manufactured with standard tolerances, significantly easing manufacturing requirements.
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
The system enhances stability and ease of use by allowing correct alignment without complex rotation, achieving a breakaway torque of ≤0.2 Nm and follow-on torque of ≤0.05 Nm, facilitating the use of coreless and cut-to-length material webs while minimizing material wastage and ensuring smooth dispensing.
Implementation Method 1
at least one of the two bearing journals is provided with at least one mating surface which is not configured as a rotation surface... a surface which is not configured as a rotation surface here is understood to be a surface of which the generatrix varies in distance to the axis of the bearing journal
Implementation Method 2
the support bar rotates together with the roll when the material web is drawn off... achieving a breakaway torque of ≤0.2 Nm and follow-on torque of ≤0.05 Nm
Data Source
AI summary
A dispensing system has a dispenser for sections of a material web wound onto a roll. A support bar is provided, on each end, a bearing journal protruding out from the roll. At least one of the two bearing journals has a mating surface which is not designed as a rotational surface. The dispenser has a guide for each bearing journal that extends to a dispensing position. A counter surface for the mating surface is provided at the beginning of the guide for each bearing journal that has the mating surface. The insertion of the roller into the dispenser is only possible if the mating surface coincides with the counter surface, which extends to in the dispensing position. The roller is rotatably arranged about the central area of the supporting rod, which does not rotate in the dispensing position.