Paper Roll Dispenser with Pendulum Spindle for Run-Out Prevention
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Solution Overview
Problem
Existing devices fail to effectively control the rotation of paper towels, toilet paper, and continuous web paper rolls of varying sizes and types, leading to run-outs and inefficient separation, especially when the paper amount depletes, and require additional cutting operations for distribution.
Innovation Solution
A device comprising a u-shaped base, an axle, and a spindle that works in unison to immobilize the paper roll, using a pendulum mechanism to block rotation and ensure separation by varying the pulling force based on the paper roll's size and amount, with adjustable components for different types of paper, including perforation for continuous web paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a fixed distance spindle from back wall is used, then small rolls can be controlled, but large rolls cannot rotate in provided space
Solution Approach 1:
The device employs a dynamic slide mechanism that allows the spindle to move horizontally along a guided path. As the roll size changes or during operation, the spindle can adjust its position along the slide, maintaining optimal contact with the roll while accommodating various diameters. This dynamic adjustment resolves the contradiction between fixed spacing and variable roll sizes.
Solution Approach 2:
The mounting structure is segmented into a base with slides that can accommodate the spindle at different positions. The slide mechanism divides the fixed mounting into adjustable segments, allowing the spindle to be positioned at varying distances from the back wall depending on the roll size being used.
2Reliability
If no rotation locking mechanism is used, then the structure remains simple, but run-outs occur when paper amount depletes
Solution Approach 1:
The device uses the weight of the paper roll itself to engage the rotation locking mechanism. As the roll depletes, the changing center of gravity automatically triggers the locking action, preventing run-outs without requiring external power sources or complex control systems. The system serves itself using the inherent properties of the paper roll.
Solution Approach 2:
A counterbalanced lever attachment bar is employed that uses the weight distribution of the paper roll to control the locking mechanism. When the roll is full, the weight distribution keeps the locking mechanism disengaged, allowing free rotation. When the roll depletes, the shifting weight automatically engages the lock, preventing run-outs.
3Ease of operation
If electro-mechanical mechanisms are incorporated, then dispensing control is improved, but space, energy, and financial resources are consumed
Solution Approach 1:
The patent replaces electro-mechanical dispensing control with a purely mechanical system. The slide mechanism, lever attachment bar, and rotation locking work together through mechanical advantage and weight distribution to provide effective dispensing control without requiring electricity, motors, or electronic sensors.
Solution Approach 2:
The mechanical system uses the inherent weight and position of the paper roll to automatically control dispensing. No external energy source is needed as the system self-regulates based on the physical state of the paper roll, eliminating energy consumption while maintaining operational control.
4Reliability
If flanges and hooks are used to place paper roll close to wall, then run-offs are ameliorated, but rotation restriction is insufficient for all roll sizes
Solution Approach 1:
The slide mechanism provides dynamic adjustment capability that allows the spindle to move to different positions along the slide path. This enables the same device to effectively restrict rotation and prevent run-offs for various roll sizes, from small to large, by adjusting the spindle's horizontal position to maintain optimal geometry.
Solution Approach 2:
The combination of slide mechanism and lever attachment bar creates a universal mounting system that can accommodate and effectively control different types and sizes of paper rolls. The same structural elements serve multiple functions: mounting, positioning, rotation restriction, and run-off prevention across varying roll dimensions.
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 device effectively prevents run-outs and ensures seamless separation of paper from rolls of any size, type, and amount, including perforating the outside layer of continuous web paper, providing a cost-effective and space-efficient solution for individual consumers.
Implementation Method 1
The center of gravity of the spindle with the paper roll, continuously placed below and against the back wall protrusion edge of the base, ensures an effective blockade from the full-size to the depleted amount of paper on the roll.
Implementation Method 2
A device comprising a u-shaped base, an axle, and a spindle working in unison to immobilize the paper roll, using a pendulum mechanism to block rotation
Data Source
AI summary
The device comprising a base (1) and a paper roll assembly comprising an axle (2), a spindle (3), and a roll of paper (4) controls the rotation of a paper roll of different types from full-size to the last sheet on a paper roll. The spindle (3) of rigid tubing with an inner diameter larger than axle diameter fits in the paper core and between side guides (22) of the axle (2) and moves gravitationally alongside slides below the edge of a base protrusion (12). The center of gravity for the spindle with paper roll works as a pendulum with axle as rotation point, sets the slant angle for slides, amplifies pull force, and works with large rolls where swing extends the lengths of slides. Serrated edge (13b) makes perforations in the outside layer of a continuous web of a paper roll.