Sheet Roll Dispenser Stub-Roll Retention for Clean Roll Changes
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Solution Overview
Problem
Existing dispensers for rolls of web-shaped material face issues such as spent spindle means or core halves dropping out, causing litter and additional maintenance work, and separate containers obstructing access to the web, especially in dispensers with horizontal axis rolls.
Innovation Solution
A dispenser design with a sensor-activated stub roll position, guide slots, and retaining means that support spindle means during roll changes, allowing simultaneous release and catch of spent spindle means when the cover is opened, preventing litter and ensuring smooth roll replacement without obstructing access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spent spindle means or core halves are allowed to drop out of the dispenser onto the floor, then the dispenser structure remains simple, but this causes litter problems and additional maintenance work
Solution Approach 1:
The invention extracts the problematic spent spindle means and core halves from the dispensing path by providing a dedicated stub roll position that receives and retains these spent elements. The retaining means selectively hold the spent spindle means or core halves in the stub roll position, preventing them from dropping onto the floor and causing litter problems while maintaining a relatively simple dispenser structure.
2Object-generated harmful factors
If a separate container or space for storing spent spindle means or cores is provided inside the lower end of the dispenser, then spent roll elements are contained, but this obstructs the user's access to the web
Solution Approach 1:
The invention resolves the spatial conflict by organizing components in vertical layers: the stub roll position with retaining means is positioned above the web access opening at the lower end. This vertical arrangement allows spent spindle means to be contained in the stub roll position while keeping the web access opening clear and accessible at the bottom of the dispenser.
3Object-generated harmful factors
If a stub roll position is provided to receive exhausted rolls, then spent spindle means are retained, but the dispenser structure becomes more complex
Solution Approach 1:
The invention merges the stub roll position and retaining means functionality into the existing dispenser structure. The retaining means are integrated with the housing and work cooperatively with the guide slots to provide retention of spent spindle means without requiring a completely separate containment system, thus achieving retention functionality with minimal additional structural 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
Prevents spindle means from dropping out, reduces maintenance effort, and allows seamless roll replacement without obstructing web access, ensuring continuous dispensing and easy cleaning.
Implementation Method 1
a sensor means (23) for monitoring the diameter of the roll and for releasing it from the dispensing position (16)
Implementation Method 2
The spindle means (S1) may cooperate with a pair of guide slots (14, 15) connecting the dispensing position (16) and the stub roll position (25) to direct the downwards movement of the first roll
Implementation Method 3
Retaining means (26, 27, 28) are arranged on both sides of the stub roll position (25) to support the spindle means (S1) when said first roll is held in the stub roll position (25), the spindle means being inserted into each end of a roll, wherein the retaining means arranged for simultaneous, or substantially simultaneous release of the spindle means when the dispenser is opened
Data Source
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AI summary
The invention relates to a dispenser for rolls of flexible sheet material, each of said rolls having spindle means extending axially outwardly beyond the ends thereof, wherein a first roll is located in a dispensing position. Alternatively, a second roll may be located in a reserve position. The dispenser further comprises a stub roll position arranged to receive a first roll exhausted to a predetermined extent. Retaining means are arranged on both sides of the stub roll position to support the spindle means inserted into each end of a roll, wherein the retaining means arranged for simultaneous release of the spindle means when the dispenser is opened.