Automatic Towel Dispenser Control for Waste-Limiting Re-Dispense
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Solution Overview
Problem
Automatic towel dispensers often dispense either insufficient or excessive amounts of towel, leading to user inconvenience and waste, as they typically provide a full length followed by a delay before allowing another dispense cycle.
Innovation Solution
A controller is used to manage the dispensing mechanism, providing a full length of towel upon initial request and a partial length in subsequent cycles if requested within a preset time, conserving towel and reducing waste by allowing users to trigger multiple dispense cycles as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full length of towel is dispensed in every dispense cycle, then the user's needs are always met, but excessive towel is wasted
Solution Approach 1:
The dispenser dynamically adjusts the towel length dispensed based on the timing of user requests. The system transitions from a static full-length dispense mode to a dynamic mode where the second dispense provides only a partial length if requested within the time window, optimizing both user satisfaction and towel conservation
Solution Approach 2:
The controller changes the dispensing parameter (towel length) based on the time interval between user requests. When the second request occurs within the preset time window, the system changes from dispensing full length to dispensing partial length, thereby reducing waste while meeting user needs
2Loss of substance
If a delay is imposed between dispense cycles, then immediate re-cycling is prevented, but users must wait longer for additional towel
Solution Approach 1:
Instead of providing a full length of towel in every cycle (excessive action), the system provides a partial length in the second cycle when requested within the time window. This partial action is sufficient to meet user needs while avoiding the waste associated with full-length dispensing in every cycle
Solution Approach 2:
The system allows users to obtain additional towel by simply triggering the dispenser again within the preset time window. The user self-regulates the total towel received by controlling how many times they activate the dispenser, eliminating the need for manual intervention or complex controls
3Ease of operation
If the dispenser allows immediate re-cycling, then users can obtain additional towel quickly, but excessive towel lengths are dispensed
Solution Approach 1:
The controller monitors the time interval between dispense cycle requests and uses this feedback to determine the appropriate towel length to dispense. When the second request comes within the preset time window, the feedback mechanism triggers a partial-length dispense, automatically adjusting the system behavior based on usage patterns
Data Source
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Figure 3A
AI summary
Towel dispensing methods and automatic towel dispensers (100) permitting conservation of the overall amount of towel (105) dispensed. The towel dispensing methods and towel dispensers limit the amount of towel dispensed in dispense cycles which occur shortly after an initial dispense cycle. The user is provided with sufficient towel to meet the user's needs while reducing overall towel usage and limiting towel waste.