Dual-Roll Towel Dispenser Motor Sensing for Continuous Supply
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Solution Overview
Problem
Hand towel dispensers face challenges in providing a consistent supply of paper towels due to their compact nature, making it difficult for maintenance personnel to predict when replacements are needed, leading to potential empty scenarios and waste from partially used rolls.
Innovation Solution
A dispenser design that accommodates two full paper towel rolls with separate dispensing mechanisms, allowing for easy loading and management, and includes web guide structures to prevent jamming, along with motor operation sensing for efficient dispensing and automatic switching between rolls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single paper towel roll is used in a compact dispenser, then the dispenser size is reduced, but the supply duration is limited and requires frequent manual replacement
Solution Approach 1:
The dispenser is divided into two separate dispensing mechanisms, each with its own motor and roll holder. This segmentation allows the system to hold two full rolls simultaneously, extending the supply duration without requiring a single oversized compartment, thus resolving the contradiction between supply duration and dispenser size.
Solution Approach 2:
The second roll holder is positioned within the housing in a space-efficient manner, allowing one dispensing mechanism to be nested or arranged compactly alongside the other. This nesting approach maximizes the use of internal volume, enabling two rolls to fit in a compact dispenser configuration.
2Loss of substance
If manual monitoring of paper towel levels is used, then the system is simple, but waste occurs from partially used rolls being discarded and uncertainty about replacement timing
Solution Approach 1:
Each motor is equipped with operation sensing capability that provides feedback to the controller about the dispensing status. The controller monitors motor operations to detect when a roll is depleted and automatically switches to the next roll, eliminating waste from partially used rolls and removing the need for manual level monitoring.
Solution Approach 2:
The system performs self-monitoring and self-switching between rolls without human intervention. The controller automatically detects when a roll is exhausted through motor operation sensing and autonomously transitions to the next roll, making the system self-sufficient and eliminating manual monitoring requirements.
3Reliability
If a transfer mechanism is used to switch between rolls, then the system can provide continuous supply, but the device complexity and potential for jamming increase
Solution Approach 1:
Instead of a single complex transfer mechanism, the system uses two independent dispensing mechanisms, each with its own motor and control. This segmentation eliminates the need for web transfer between rolls, reducing mechanical complexity and potential jamming points while maintaining continuous supply capability through electronic switching.
Solution Approach 2:
The mechanical web transfer mechanism is replaced with an electronic control system that monitors motor operations and switches between rolls electronically. The controller detects roll depletion through motor sensing and activates the appropriate motor, substituting complex mechanical transfer with simpler electronic control logic.
4Ease of operation
If the bottom roll holder is fixed in position, then the structure is simple, but accessibility for loading and web management is difficult
Solution Approach 1:
The bottom roll holder is designed to move between a storage position and a loading position. This dynamic positioning allows the roll holder to be accessible for loading when needed and compact during normal operation, improving ease of operation without requiring a permanently open or complex adjustable structure.
Solution Approach 2:
The roll holder is pre-positioned in a loading configuration when the cover is opened, preparing the path for web insertion before the loading act is completed. This preliminary positioning simplifies the loading process by having the mechanism ready in advance, reducing the complexity of real-time adjustments during loading.
Data Source
AI summary
Some example sheet product dispensers that accommodate one or more sheet product rolls are provided herein. An example sheet product dispenser includes a dispensing mechanism with a drive roller and nip roller. A motor is configured to rotate the drive roller to cause a portion of the sheet product to dispense from the sheet product dispenser. A controller is configured to determine a sheet length for dispensing and cause the motor to operate to cause sheet product to be dispensed from the sheet product dispenser. The controller is further configured to monitor an amount of rotation of the motor as the motor operates and cause, in an instance in which the amount of rotation of the motor corresponds to the determined sheet length, the motor to cease operation so as to cause the determined sheet length of sheet product to be dispensed from the sheet product dispenser.