Decoupled Print Stream Data Transmission for Mailpiece Inserter Synchronization
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Solution Overview
Problem
Conventional mailpiece inserter systems face challenges in printing errors and throughput compatibility, leading to inefficiencies and long processing times due to improper synchronization of data processing paths, which hinder the integration of printing devices with mailpiece inserters and result in delays and reprocessing of entire print jobs.
Innovation Solution
A method that decouples the write and read paths for print stream data transmission, allowing for on-demand printing by activating one path while inactivating the other, and uses a page-based language monitor to throttle the printer output, ensuring compatibility with integrated printers and reducing simultaneous access conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional print control logic with spoolers and print drivers is used to process complex print jobs, then the print job can be processed and printed, but the processing time becomes excessively long (several hours for processing plus 15 hours for printing 50,000 sheets)
Solution Approach 1:
The patent pre-processes print jobs into page-based data structures before printing, creating an optimized representation that can be quickly rendered. The print job is converted into a sequence of page images that can be directly sent to the printer without extensive processing during the print phase, significantly reducing the 15-hour print time mentioned in the background.
Solution Approach 2:
The patent divides the print job into individual page segments that can be processed and printed independently. This segmentation allows the system to process pages in smaller batches rather than handling the entire 50,000-sheet job as one monolithic task, improving both processing efficiency and enabling better resource management.
2Productivity
If a printer is physically integrated with a mailpiece inserter to enable on-demand printing, then throughput compatibility can be improved, but synchronization errors occur when the write path (application software to spool file) and read path (spool file to print processor) access the spool file simultaneously
Solution Approach 1:
The patent implements periodic flushing of the spool file at defined intervals rather than allowing continuous simultaneous access. The write path and read path are coordinated through periodic synchronization points where data is transferred from the spool file to the print processor in controlled batches, eliminating the race conditions that cause synchronization errors.
Solution Approach 2:
The patent introduces a spool file management layer that acts as an intermediary between the write path (application software) and read path (print processor). This intermediary coordinates access to the spool file, managing the transfer of page-based data structures and ensuring that read and write operations do not conflict, thus preventing synchronization errors.
3Ease of operation
If the spool file is accessed simultaneously by the write path (application software/spooler) and read path (print processor), then data transmission can occur, but processing errors occur due to synchronous access to the same data location
Solution Approach 1:
The patent pre-allocates and pre-structures the spool file with defined data locations and formats before writing begins. Page-based data structures are prepared in advance with proper formatting and positioning information, ensuring that when the print processor reads the data, it accesses properly formatted information without encountering synchronization conflicts or data corruption.
Data Source
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AI summary
A method and system for processing data indicative of pages of mailpiece content material, and for printing pages "on demand" for use in a mailpiece inserter. The method comprises the steps of: (i) transmitting data from the application software (60A) to a print processor (44) along read (TPR) and write (TPW) paths and (ii) activating one of the write (TPW) and read (TPR) such that when one path is activated the other path is inactivated. The data is then rendered into a print control language (PCL) compatible with a printer (12) integrated with the mailpiece inserter and printed for use therein. The method and system mitigates printing errors by eliminating synchronous access to the same data location within the spool file (72), i.e., by the application software/spooler (60A/70) along the write path (TPW) and the print processor along the read path (TPR).