Dispenser for sections of a roll-up material web
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Solution Overview
Problem
Existing dispensers for materials like toilet paper and household paper struggle to prevent the use of rolls with mismatched bearing journals, leading to malfunctions and improper insertion, as they lack effective mechanisms to distinguish and handle incorrectly or non-coded pins.
Innovation Solution
Incorporating a safety device with a guideway interruption and an ejection mechanism, such as a leaf spring or spring element, between the insertion and dispensing positions to catch and deflect or eject incorrectly coded bearing pins, ensuring only correctly coded pins reach the dispensing position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guideway with a raised rib and groove coding is used at the insertion position, then correctly coded bearing pins can be properly inserted and guided, but incorrectly or non-coded bearing pins can still be inserted if the bearing journals are shortened or lack grooves, leading to potential malfunctions
Solution Approach 1:
The patent applies preliminary action by placing a safety device with coding recognition capability at the insertion position, before the bearing pin enters the main guideway. This safety device pre-verifies the coding of the bearing pin and prevents incorrectly coded pins from proceeding further, thus ensuring reliability while maintaining ease of operation for correctly coded pins.
Solution Approach 2:
The patent introduces an intermediary safety device with a raised rib and groove coding mechanism that acts as a mediator between the user and the main guideway. This intermediary verifies the coding of bearing pins before they enter the main system, preventing malfunctions while allowing correct pins to pass through smoothly.
2Reliability
If a safety device is added to the guideway to catch incorrectly coded bearing pins, then rolls with mismatched bearing journals are prevented from being used, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the guideway into two functional segments: a safety device segment with raised rib and groove coding for verification, and a main guideway segment for material transport. This segmentation allows the safety function to be added without completely redesigning the entire guideway system, thus limiting the increase in device complexity.
Solution Approach 2:
The patent applies local quality by adding the safety device with specific raised rib and groove coding features only at the insertion position where verification is needed, rather than modifying the entire guideway structure. This localized approach ensures reliability improvement while minimizing the increase in overall device complexity.
3Reliability
If an ejection device such as a leaf spring is used to deflect incorrectly coded bearing pins, then mismatched rolls are actively sorted out, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies self-service by designing the ejection device as a leaf spring that automatically activates when an incorrectly coded bearing pin is detected. The leaf spring uses its own elastic properties to deflect the incorrect pin without requiring external power sources, complex control systems, or additional actuators, thus improving sorting capability while maintaining ease of manufacture.
Solution Approach 2:
The patent uses a simple leaf spring as the ejection device, which is a cheap and simple mechanical element compared to electronic or complex mechanical sorting systems. The leaf spring can be easily manufactured and replaced if needed, providing active sorting capability without significantly increasing manufacturing cost or complexity.
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
Effectively prevents the use of rolls with mismatched bearing journals by catching and sorting them, ensuring proper functionality and preventing malfunctions by ensuring only correctly coded pins reach the dispensing position.
Implementation Method 1
A leaf spring is preferably provided as the ejection device, which is clamped in the side wall of the dispenser on the side opposite the interruption. A bearing pin with the correct coding deflects the leaf spring and reaches the dispensing position.
Implementation Method 2
A bearing pin that is incorrectly coded or not coded, on the other hand, is pressed into the depression or bulge by the leaf spring crossing the guideway at an angle through the interruption in the guideway.
Data Source
Figure 1~3
Figure 4~6
Figure 5
AI summary
The invention relates to a dispenser for sections of a material web (12) which is wound to a roll (8), wherein a guide track (5) is provided, which leads to a dispensing position (10) and which is appropriately coded at at least one location to an end side-coded bearing journal (15) that protrudes from the roll (8). A catching device for incorrectly or non-coded bearing journals (17) is formed at the coded location of the guide track (5).