Automatic Towel Dispensing With Perforation Learning Control
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Solution Overview
Problem
Conventional towel dispensers are limited in their ability to efficiently dispense towels of varying lengths and types, particularly with perforated towels, as they often require pre-programmed lengths and do not adapt well to different towel sizes or user preferences.
Innovation Solution
A towel dispenser system that includes a motor assembly and sensor to extend and retract toweling, with a learning sequence to determine the optimal dispensing length based on the towel's perforation spacing, allowing for adjustable dispensing of single or multiple towels at a time, and featuring a guide system with toothed rollers for precise control and user-friendly operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional towel dispensers use pre-programmed fixed lengths for dispensing, then the dispensing process is simple and reliable, but the dispenser cannot adapt to different towel sizes or user preferences
Solution Approach 1:
The dispenser transitions from a static fixed-length dispensing system to a dynamic system that can adjust dispensing length. The motor assembly can operate in different modes (single towel, multiple towels, continuous) and the dispensing length is dynamically determined by either pre-set options or user input, allowing adaptation to different towel sizes and user preferences without requiring complex real-time sensing systems
Solution Approach 2:
The system allows changing the dispensing parameter (length/number of towels) through different operational modes. The controller can be programmed with different dispensing lengths corresponding to single towel, multiple towels, or continuous dispensing, enabling the same hardware to adapt to various requirements by simply changing the operational parameter rather than the physical structure
2Manufacturing precision
If the dispenser uses a learning sequence to determine optimal dispensing length based on perforation spacing, then dispensing accuracy is improved, but the operation time and complexity increase
Solution Approach 1:
The learning sequence is executed during the initial setup or first use of the dispenser, determining the optimal dispensing length based on the actual toweling's perforation spacing before normal operation begins. This preliminary characterization of the material properties allows the controller to store and use this information for all subsequent dispensing operations, achieving high accuracy without requiring the learning process to repeat during each dispensing event
Solution Approach 2:
The system replaces mechanical measurement methods with optical or electronic sensing to detect perforation spacing. The sensor system can quickly detect the distance between perforations and calculate the optimal dispensing length, which is much faster and more precise than mechanical measurement methods, thereby reducing the time penalty associated with the learning sequence
3Ease of operation
If the dispenser extends and retracts toweling using a motor assembly with sensor detection, then dispensing control is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The motor assembly serves multiple functions: it extends the toweling during dispensing, retracts the toweling to maintain proper positioning, and works with the sensor system to detect when dispensing should occur. This multi-functionality reduces the need for separate mechanisms for each operation, thereby limiting the increase in overall device complexity despite the added automation capabilities
Solution Approach 2:
The sensor system automatically detects the presence of a user or the need for dispensing and triggers the motor assembly to operate accordingly. The system can detect when the toweling needs to be extended or retracted based on sensor feedback, enabling automatic operation without requiring complex user interfaces or manual controls, thus improving ease of operation while keeping the control system relatively simple
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.