Sheet Dispenser Tear Bar Sensing for Accurate Sheet Separation
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Solution Overview
Problem
Existing sheet product dispensers lack effective detection of when the dispensed sheet product has been separated from the dispenser, leading to potential waste and inconsistent dispensing.
Innovation Solution
A sheet product dispenser with a tear bar and a sensor system that includes a movable member, biasing member, and a controller, where the controller is activated and deactivated based on signals from a proximity sensor and a tear sensor to manage the dispensing process and prevent unnecessary waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor system with movable member and biasing member is added to detect sheet separation, then waste is minimized and dispensing consistency is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical sensing systems with an optical sensor that detects the position of a tear bar. The sensor system uses a movable member with biasing member that can be actuated by the tear bar, converting mechanical movement into an optical detection signal. This substitution maintains high reliability while reducing overall mechanical complexity compared to traditional mechanical switches or complex linkages.
Solution Approach 2:
The movable member acts as an intermediary between the tear bar and the sensor. When the tear bar moves during sheet separation, it actuates the movable member, which in turn triggers the sensor to detect the separation event. This intermediary mechanism provides reliable detection while isolating the sensor from direct mechanical stress and complexity.
2Device complexity
If timing-based control is used to manage dispensing, then device complexity is kept simple, but waste increases and dispensing consistency deteriorates
Solution Approach 1:
The patent implements a feedback control system where the sensor continuously monitors the position of the tear bar and provides real-time information to the controller. When sheet separation is detected, the controller receives feedback and adjusts or stops dispensing accordingly. This feedback mechanism eliminates waste by preventing over-dispensing while maintaining simple overall device architecture through intelligent control algorithms.
3Loss of substance
If no separation detection is provided, then device complexity remains low, but waste increases and productivity decreases due to inconsistent dispensing
Solution Approach 1:
The sensor system is designed to automatically detect sheet separation and trigger appropriate control actions without requiring manual intervention or complex external monitoring systems. The tear bar's own movement during separation serves to actuate the detection mechanism, creating a self-service system that reduces waste while maintaining acceptable device complexity.
Data Source
AI summary
A sheet product dispenser is provided. The sheet product dispenser includes a roll of sheet product, a dispensing arrangement, and a method of sensing the separation of a dispensed sheet product. A sensor is provided for detecting the movement of a movable member, such as a tear bar or paper guide. The sensor generates a signal in response to the movement of the movable member. A controller de-energizes a roller in said dispensing arrangement in response to said signal.