Paper Roll Bushing With Frangible End Wall for Dispenser Compatibility
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Solution Overview
Problem
Existing paper roll dispensers face issues with incompatible paper rolls causing damage and increased maintenance costs due to the lack of effective quality control mechanisms to ensure only specifically tailored rolls are used.
Innovation Solution
A paper roll with a hollow core and a press-fitted bushing having a frangible end wall with a central pin-receiving hole, designed to fit only in a compatible dispenser, ensuring proper alignment and preventing the use of incompatible rolls by breaking if attempted to be reused.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dispenser is designed to accept various paper rolls, then the adaptability and versatility of the dispenser is improved, but the reliability and quality control deteriorate due to incompatible rolls causing damage and increased maintenance costs
Solution Approach 1:
The patent introduces a coupling device as an intermediary component that mediates between the paper roll core and the dispenser. This coupling device includes a bushing with specific geometric features (cylindrical body, flange, and pin-receiving hole) that must match corresponding features in the dispenser, creating a controlled interface that ensures compatibility while maintaining versatility
Solution Approach 2:
The coupling device employs asymmetric geometric features including a one-way pin mechanism that allows insertion in only one orientation. The pin can be inserted through the pin-receiving hole to prevent rotation, but cannot be removed without destroying the coupling device, creating an asymmetric engagement that ensures proper alignment and prevents incompatible rolls from being installed
2Stability of the object's composition
If a coupling device with a pin mechanism is used to prevent rotation, then the stability of the paper roll is improved, but the ease of operation deteriorates because the pin cannot be removed without destroying the coupling device
Solution Approach 1:
The coupling device is designed as a disposable component that is destroyed during the replacement process. The one-way pin mechanism allows easy insertion and stable operation, but requires destruction of the coupling device (by bending the pin or breaking the bushing) for removal. This trade-off prioritizes operational simplicity and stability during use, accepting that the coupling device must be replaced along with the paper roll
Solution Approach 2:
The coupling device is pre-installed on the paper roll core before the paper is wound around it. This preliminary action ensures that the stability and alignment features are already in place before the paper roll is put into service, eliminating the need for complex installation mechanisms during operation
Data Source
AI summary
The invention provides a paper roll, a bushing for a paper roll and a combination of a paper roll with a dispenser. The paper roll comprises a hollow paper roll core with two opposite extremities. The bushing has a cylindrical body press-fitted into at least one of the extremities of the paper roll core and the bushing further comprises a circular end wall frangibly fixed to a first end of the body and closing the extremity of the paper roll core. The end wall is provided with a central pin-receiving hole. The end wall is designed to breaks off when removing the paper roll from the dispenser. Thus, the bushing cannot be reused. Therefore, this invention participates in the enhancement of a quality control system.