Tissue Dispenser with Sensor-Driven Stub Roll Drop-Down Mechanism
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Solution Overview
Problem
Tissue dispensers often leave stub rolls unused until maintenance, risking exhaustion and wasting remaining tissue, and require manual handling for roll replacement, which can be inconvenient and wasteful.
Innovation Solution
A dispensing system with a sensor and piston mechanism that automatically detects roll size, disengages from the stub roll when it reaches a threshold, allowing it to drop and making space for a fresh roll, while continuing to dispense from the stub roll to maximize its use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual roll replacement is used, then maintenance staff can replace rolls, but it requires removing old rolls before installing new ones and risks exhausting stub rolls between maintenance periods
Solution Approach 1:
The system performs preliminary action by automatically detecting when a roll is depleted and proactively moving the stub roll to the secondary position before maintenance staff arrive. This eliminates the need for manual intervention to check roll status and ensures continuous operation without waiting for maintenance schedules.
Solution Approach 2:
The dispenser performs self-service by automatically monitoring roll levels through sensors and executing the stub roll relocation process without human intervention. The system monitors itself, makes decisions, and executes actions autonomously, freeing maintenance staff from routine roll replacement tasks.
2Loss of substance
If stub rolls are left in the dispenser until maintenance, then space is maintained for fresh rolls, but the remaining tissue may be wasted due to exhaustion
Solution Approach 1:
The system takes preliminary action by detecting when a roll is depleted and automatically relocating the stub roll to the secondary position before it can be exhausted. This proactive approach ensures that remaining tissue on stub rolls is preserved and can be used later, eliminating waste from unexpected roll exhaustion.
Solution Approach 2:
The system uses feedback from sensors that continuously monitor roll size and depletion status. When the sensor detects a depleted roll, it triggers the actuator to move the stub roll, creating a closed-loop control system that responds to actual roll conditions and prevents tissue waste through timely intervention.
3Productivity
If automatic stub roll detection and movement is implemented, then stub rolls are fully utilized and space is made for fresh rolls, but the device complexity increases with sensors and actuators
Solution Approach 1:
The system achieves self-service automation where simple sensors detect roll depletion and trigger actuators to automatically relocate stub rolls. This autonomous operation eliminates manual roll management, significantly improving productivity and dispenser efficiency without requiring complex centralized control systems.
Solution Approach 2:
The invention replaces complex manual mechanical operations with simpler sensor-actuator systems. Instead of requiring manual inspection and handling, electronic sensors detect roll status and electric actuators perform the physical movement, substituting human labor with automated electromechanical components that are easier to control and maintain.
4Loss of time
If manual roll inspection is required, then maintenance staff can assess roll status, but it increases maintenance time and labor requirements
Solution Approach 1:
The dispenser performs self-monitoring using sensors that automatically detect roll depletion and track stub roll status. This eliminates the need for maintenance staff to manually inspect rolls, significantly reducing maintenance time and labor requirements while providing continuous monitoring without human intervention.
Solution Approach 2:
The system implements continuous feedback through sensors that monitor roll size and depletion in real-time. This automated monitoring provides ongoing status information without requiring manual inspection, allowing maintenance staff to focus on higher-value tasks and reducing overall maintenance time and labor costs.
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
Ensures the remaining tissue on stub rolls is fully utilized, simplifies the replacement process by automatically making space for new rolls, and provides visual status indicators for maintenance staff.
Implementation Method 1
The sensor can move as the roll decreases in size (e.g., the outside diameter decreases) and can apply a force to the roll
Implementation Method 2
Due to an operational connection of the sensor and piston, the movement of the sensor can cause the piston to move too
Implementation Method 3
This results in the roll (now a stub roll) automatically dropping, such as at least partly by force of gravity, from a main position to a secondary position
Data Source
AI summary
Various dispensing systems with drop-down features are disclosed. In certain embodiments, the dispensing system includes a roll support with a sensor and a piston. The sensor can move as the roll decreases in size (e.g., the outside diameter decreases) and can apply a force to the roll. The piston can move to become less engaged with the roll, such as becoming less received in a roll plug or the hollow core of the roll. When the roll has decreased to a threshold size, the piston substantially or fully disengages from the roll and/or the sensor applies a force to dislodge the roll from the roll support. This results in the roll automatically dropping off the roll support. The roll support is thus available to receive a fresh roll.