Printer Media Path Flushing for Blind Spot Jam Prevention
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Solution Overview
Problem
Printing systems face challenges in detecting and flushing media from blind locations within the media path, particularly during system initialization, urgent stops, or mechanical resets, where sensors may not detect media presence, leading to potential jamming issues.
Innovation Solution
A coordinated flushing method is implemented, where the printer processor calculates the maximum distance media can travel without being detected by sensors (D1max) and initiates simultaneous activation of feed mechanisms to move media through the path, monitoring sensor signals to ensure complete flushing, and optionally adjusts speed based on device capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensors are spaced farther apart to reduce system complexity, then device complexity is reduced, but blind locations exist along the media path where media presence cannot be detected
Solution Approach 1:
The system performs a preliminary flush operation before normal printing begins. When media is detected in the path (e.g., after boot-up or urgent stop), the controller activates the feed mechanisms to advance media past the sensor blind spots before resuming normal operation, ensuring no media remains in undetected locations
2Use of energy by moving object
If drive mechanisms are turned off to save energy during idle periods, then energy consumption is reduced, but media may remain in blind locations causing jamming on restart
Solution Approach 1:
Before resuming printing operations after idle periods or urgent stops, the system performs a preliminary flush operation. The controller detects if media is present in the path and activates feed mechanisms to advance media past sensor blind spots, ensuring the path is cleared before normal operation begins
Solution Approach 2:
The controller continuously monitors sensor signals to detect media presence in the path. When media is detected (indicating a potential jam condition), the controller activates feed mechanisms to flush the media past blind spots, then confirms clearance through sensor feedback before resuming normal printing operations
3Productivity
If feed mechanisms run constantly to advance media, then media processing speed is maximized, but energy consumption increases during idle periods when no printing is occurring
Solution Approach 1:
The feed mechanisms operate periodically rather than continuously. They remain inactive during idle periods to save energy, then activate temporarily during preliminary flush operations before printing begins, and resume normal operation only when media is confirmed to be advancing properly through the system
Data Source
AI summary
A printing device for use with a peripheral media-handling device defining a peripheral media path with a first sensor therealong including a print engine coupled with the peripheral media-handling device to accommodate conveyance of media therebetween, the print engine defining an engine media path between an inlet and an outlet thereof, and including a second sensor therealong, and a processor configured to calculate a greatest distance collectively along the media paths that media can travel without reaching one of the sensors, the processor being further configured to command substantially simultaneous flushing of the peripheral media-handling device and the print engine to advance media the calculated greatest distance.