Paper Dispenser Jam Self-Correction Using Retraction and Refeeding
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Solution Overview
Problem
Conventional electronic paper product dispensers often misfeed or jam, leading to the dispenser being taken out-of-service until a service attendant can resolve the issue, which can take hours or days and is costly.
Innovation Solution
The dispenser includes a jam sensor that detects a jam condition and initiates a series of steps to retract and reposition the web material between the nip and tear bar, followed by further attempts to dispense, allowing self-correction without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional hands-free dispensers are used, then automatic dispensing is achieved, but misfeeds and jams occur frequently
Solution Approach 1:
The dispenser automatically detects jams via sensors and executes retraction and refeeding sequences without human intervention. The system self-corrects misfeeds by reversing the dispensing mechanism and repositioning the paper web, eliminating the need for manual service calls for minor jams.
Solution Approach 2:
Multiple sensors monitor the paper web position, tension, and flow throughout the dispensing mechanism. This feedback system detects anomalies in real-time and triggers corrective actions by the control system to prevent or resolve jams before they disrupt service.
2Ease of repair
If service attendants are called to resolve jams, then the dispenser is repaired, but downtime increases and costs increase
Solution Approach 1:
The dispenser performs self-diagnosis and self-repair for common jam conditions through automated retraction and refeeding sequences, eliminating the need for service attendants to handle routine jams and reducing downtime to minutes instead of hours.
Solution Approach 2:
The system performs preliminary detection and correction actions immediately when a jam is detected, preventing the condition from worsening and avoiding the need for manual intervention. The automated response occurs within seconds of detection, minimizing service disruption.
3Reliability
If the web material is retracted and repositioned during a jam, then self-correction is achieved, but the dispense cycle is extended
Solution Approach 1:
The system uses periodic sensing and controlled retraction/advancement cycles to gradually resolve jams. Instead of continuous operation, the mechanism alternates between dispensing and corrective repositioning actions, systematically working through the jammed material.
Solution Approach 2:
When a jam is detected, the system reverses the normal dispensing direction by retracting the web material back through the mechanism. This inversion allows the material to be repositioned and realigned, then dispensed again in the correct direction to clear the jam.
Data Source
AI summary
A dispenser and methods for dispensing web material, the dispenser comprising a dispensing mechanism comprising a pressure roller and a drive roller defining a nip therebetween, wherein the dispensing mechanism is configured to dispense the web material from the roll of web material in response to a user request, and wherein during the dispense a leading edge of the web material being dispensed first passes through the nip and then passes the tear bar and then out of the housing such that the leading edge is external to the housing; a jam sensor configured to detect a jam condition during or after the dispense of the web material; and wherein, in response to a jam condition, the dispensing mechanism is configured to (i) retract the web material to place the leading edge between the nip and the tear bar and (ii) then advance the leading edge past the tear bar.