Nested Print Job Recovery Using Secured Restart Points

Solution Overview

Problem

Existing printing systems face significant losses of printing media, ink, and time when a nested printing job is interrupted due to errors, requiring the entire job to be restarted from the beginning.

Innovation Solution

A method and system for identifying and utilizing recovery points within a nested printing job to resume printing from a secure point after an error, using automated detection and selection of recovery points, such as white bands and finishing marks, to minimize waste and speed up recovery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the entire nested printing job is restarted from the beginning after an error, then the printing system can ensure complete and accurate output, but significant amounts of printing media, ink, and time are wasted

Engineering Contradiction:

Improveprinting output completenessVSAvoidprinting media waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The nested printing job is segmented into multiple individual printing jobs that can be independently identified and recovered. Each job within the nested structure is treated as a separable unit, allowing the system to recover only the affected segment rather than the entire job. This segmentation enables selective recovery of printing jobs based on error location, preventing waste of media and resources associated with restarting the complete nested job.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the entire nested printing job is restarted from the beginning after an error, then printing accuracy is maintained, but printing time is significantly increased

Engineering Contradiction:

Improveprinting output completenessVSAvoidprinting downtime

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary identification and marking of individual printing jobs within the nested structure before errors occur. Recovery points are pre-established at the boundaries of these segmented jobs. When an error is detected, the system can immediately jump to the appropriate pre-identified recovery point without needing to reprocess completed jobs, thereby minimizing downtime while ensuring printing accuracy is maintained for the recovered portion.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the entire nested printing job is restarted from the beginning after an error, then complete output quality is ensured, but ink consumption is significantly increased

Engineering Contradiction:

Improveprinting output completenessVSAvoidink consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The nested printing job is segmented into multiple individual printing jobs that can be independently identified and recovered. Each job within the nested structure is treated as a separable unit, allowing the system to recover only the affected segment rather than the entire job. This segmentation enables selective recovery of printing jobs based on error location, preventing waste of media and resources associated with restarting the complete nested job.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP3680768B1Recovery of a partially damaged nested job

Publication Date: 2025.11.19 CANON PRODN PRINTING HLDG BV

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AI summary

The present invention is related to a method of recovering a nested printing job and a respective printing system. The method comprises the steps: - determining possible recovery points (RP1, RP2, RP3, RP4, RP5, RP6) for the nested printing job; - identifying secured recovery points (RP1, RP2, RP3, RP4, RP5, RP6) within the possible recovery points (RP1, RP2, RP3, RP4, RP5, RP6); - selecting one secured recovery point (RP1, RP2, RP3, RP4, RP5, RP6) when the nested printing job stops due to an error; and - resuming the nested printing job at the selected recovery point(RP1, RP2, RP3, RP4, RP5, RP6).