Automatic Towel Dispenser Retraction Control for Perforated Rolls
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Solution Overview
Problem
Conventional towel dispensers are limited in their ability to efficiently dispense towels of varying lengths and do not effectively manage the unwinding and rewinding of perforated paper towels, leading to inefficiencies and potential jamming issues.
Innovation Solution
A towel dispenser system that includes a motor assembly for extending and retracting toweling, a sensor for detecting the leading edge of the toweling, and a guide system with toothed rollers to manage the perforated paper towels, allowing for adjustable dispensing lengths and preventing jamming by sensing and ceasing retraction when the leading edge is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional towel dispensers use fixed guide systems and motors to dispense towels, then towels can be dispensed automatically, but the dispensers cannot efficiently manage perforated paper towels and adjust dispensing lengths
Solution Approach 1:
The guide system employs movable guide rollers that can dynamically adjust their positions along the towel path. This allows the dispenser to accommodate varying towel lengths and configurations, particularly for perforated paper towels, without requiring a completely fixed rigid structure. The dynamic adjustment capability enables adaptability while maintaining manageable system complexity.
Solution Approach 2:
The guide system is divided into multiple independent guide rollers rather than a single fixed component. Each roller can be independently positioned and adjusted, allowing the system to handle different towel types and lengths. This segmentation provides flexibility and adaptability while keeping each individual component simple and manageable.
2Reliability
If the motor continuously winds the toweling roll, then the toweling remains neat, but jamming occurs with perforated paper towels
Solution Approach 1:
The sensor detects the leading edge of each perforated towel and provides feedback to the motor controller. When a leading edge is detected, the motor stops winding to prevent jamming. This feedback mechanism allows the system to automatically adapt to the presence of perforations without requiring manual intervention, maintaining reliability while simplifying operation.
Solution Approach 2:
The sensor-motor system automatically detects and responds to towel perforations without user intervention. The system self-regulates the winding process by stopping when it detects a leading edge, eliminating the need for users to manually manage the unwinding and rewinding of perforated paper towels.
3Reliability
If the sensor detects the leading edge during retraction, then jamming is prevented, but the retraction process becomes more complex
Solution Approach 1:
The sensor provides real-time feedback during the retraction process by detecting the leading edge of the towel. This feedback allows the motor to precisely control when to stop retracting, ensuring accurate positioning and preventing jamming. The feedback mechanism adds reliability while the integration remains manageable through straightforward sensor-motor communication.
Data Source
AI summary
Dispensing towels includes, using a motor assembly configured to cause a leading edge of the toweling to be extended from a housing of the dispenser and to cause the toweling to be subsequently retracted back into the housing, (a) the step of extending the toweling exterior of the housing for grasping by a user; and (b) subsequent thereto, the steps of (1) retracting the toweling into the housing using the motor assembly; (2) sensing a leading edge of the toweling, using a sensor, while retracting the toweling; and (3) ceasing retracting of the toweling into the housing using the motor assembly as a function of sensing the leading edge of the toweling using the sensor. The toweling is advanced by the motor assembly such that a line of perforations in the toweling, along which the user tears the toweling, is located downstream of the sensor.