Transfer Bar Actuation for Precise Sheet Dispenser Stub-Roll Detection
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Solution Overview
Problem
Existing sheet product dispensers face challenges in accurately detecting when a stub roll is depleted, leading to waste and increased costs, and they often require manual refilling, with issues related to noise, battery conservation, and inconsistent dispensing.
Innovation Solution
A sheet product dispenser with an electromechanical actuator and sensor system that moves a transfer bar to switch from a stub roll to a secondary roll based on detection of remaining sheet product, using a cam mechanism and optical sensors to ensure precise switching and minimize waste, while also detecting user presence and conserving battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mechanical lever is used to detect stub roll diameter, then the system can detect when the stub roll is depleted, but the detection is imprecise causing the secondary roll to dispense before complete depletion, resulting in wasted sheet product
Solution Approach 1:
The patent replaces the mechanical lever detection system with an optical sensor system. The optical sensor emits light and detects its reflection from the stub roll surface, enabling precise measurement of the stub roll diameter without mechanical contact. This substitution eliminates the imprecision of mechanical lever detection and allows accurate determination of when the stub roll is truly depleted, preventing premature secondary roll dispensing and reducing sheet product waste.
2Reliability
If a sensor in the dispensing chute is used to detect sheet product presence, then the system can ensure sheet product availability, but it limits usage to perforated sheet product and causes a time gap in dispensing
Solution Approach 1:
The patent replaces the mechanical sensor in the dispensing chute with an optical sensor positioned adjacent to the roller assembly. This optical sensor detects the presence or absence of sheet product by sensing light reflection or obstruction near the roller assembly, rather than requiring physical contact with the sheet product. This allows the system to work with both perforated and non-perforated sheet product, eliminating the limitation to only perforated types while maintaining reliable detection and eliminating dispensing gaps.
3Extent of automation
If a transfer motor with linkages is used to move the transfer bar, then the system can automatically transfer sheet product from the secondary roll, but it generates noise and increases device complexity
Solution Approach 1:
The patent replaces the transfer motor with linkages system with an electromechanical actuator that directly moves the transfer bar. The electromechanical actuator converts electrical signals directly into linear motion of the transfer bar without requiring complex mechanical linkages to translate rotational motion. This simplifies the mechanical structure, reduces the number of moving parts, and decreases noise generation while maintaining full automatic transfer capability from the secondary roll.
4Reliability
If the sensor continuously monitors sheet product presence, then the system can ensure consistent dispensing, but it increases battery power consumption
Solution Approach 1:
The patent implements periodic monitoring of sheet product presence using the optical sensor. Instead of continuous monitoring, the sensor checks for the presence or absence of sheet product at specific intervals or trigger events (such as when the dispenser is activated or when the stub roll is expected to be depleted). This periodic action maintains reliable dispensing detection while significantly reducing battery power consumption compared to continuous monitoring, extending the operational life of battery-powered dispensers.
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 system effectively minimizes waste by accurately detecting stub roll depletion, reduces noise through vibration isolation, and extends maintenance intervals by automating the switch to the secondary roll, ensuring consistent dispensing and efficient battery use.
Implementation Method 1
A sensor is arranged in operable communication with the roller assembly, the sensor being electrically coupled to the electromechanical actuator
Implementation Method 2
An electromechanical actuator is arranged having a movable portion coupled to the transfer bar, wherein the movable portion is arranged to move the transfer bar
Implementation Method 3
Sheet product is generally dispensed using a roller system where the sheet product is passed between two rollers and the resulting friction pulls the sheet product from the dispensing roll
Data Source
AI summary
A sheet product dispenser includes a transfer bar, a roller assembly, a motor, a sensor, and a controller. The transfer bar is movable between first and second positions. The roller assembly, disposed proximate the transfer bar second position, has a drive roller and a pinch roller that define a nip. The motor is in operable communication with the transfer bar to move the transfer bar between the first and second positions. The sensor is in operable communication with the dispenser cover. The controller is in operable communication with the sensor and the motor, and is responsive to executable instructions to facilitate actuation of the motor in response to a signal from the sensor to cause the transfer bar to move between the first position and second positions. The transfer bar includes at least one finger that drives an end of a roll of sheet product towards the nip upon actuation of the transfer bar from the first position to the second position.