Image Forming Device Proof-Printing via Secondary Stacking Unit
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Solution Overview
Problem
In image forming devices, it is difficult for operators to visually check the quality of images printed on paper without interrupting the printing process, as the discharge destination is typically set to a primary stacking unit that prevents external visual inspection, making it impossible to check the image quality of subsequent jobs until the current job is completed.
Innovation Solution
The implementation of a system that allows proof-printing of at least one page of a subsequent printing job while another job is being processed, by temporarily halting the current printing job and discharging the proof-printed page to a secondary stacking unit for visual inspection, enabling quality checks without completing the preceding job.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharge destination is set to a primary stacking unit with the door closed, then printing efficiency is improved, but visual inspection of image quality becomes impossible
Solution Approach 1:
The patent divides the stacking function into two separate units: a primary stacking unit for high-capacity storage and a secondary stacking unit for visual inspection. This segmentation allows the system to maintain both high printing efficiency and visual inspection capability simultaneously by directing different print jobs to appropriate destinations.
Solution Approach 2:
The control unit acts as an intermediary that receives print jobs and intelligently determines the discharge destination. It mediates between the conflicting requirements of efficiency and inspection by analyzing job characteristics and routing accordingly, enabling both goals to be achieved without direct conflict.
2Productivity
If the door of the stacker is kept closed during printing, then printing continuity is improved, but quality checking of subsequent jobs must wait until current job completion
Solution Approach 1:
The system performs preliminary quality inspection by printing a test page from the upcoming job to the secondary stacking unit before the current job completes. This preliminary action allows quality checking to occur in advance, eliminating the waiting time that would otherwise be required after job completion.
Solution Approach 2:
The control unit manages the printing system to maintain continuous useful action by overlapping the test page printing of the next job with the completion phase of the current job. This ensures that quality inspection activities occur continuously without interrupting the main printing workflow.
3Device complexity
If proof-printing is performed by waiting for current job completion, then printing process simplicity is maintained, but quality check timing is delayed until after current job finishes
Solution Approach 1:
The control unit dynamically adjusts the printing process by temporarily pausing the current job when a test page from the next job needs to be printed. This dynamic management allows the system to maintain relative simplicity while achieving timely quality inspection, as the pause is brief and automatically managed rather than requiring complex manual intervention.
Data Source
AI summary
An image forming method for controlling a device to receive a printing job; and to execute an intervening of a proof-printing to print at least one certain page of the received printing job in order to check its quality while an another printing job is being processed if the proof-printing is specified to the received printing job and if another printing job is being processed.