Image Forming Apparatus Sheet Cassette Switching Logic
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Solution Overview
Problem
Image forming apparatuses with automatic switching functions face challenges in maintaining post-processing precision when switching from new sheets to reused sheets, as reused sheets with toner layers and post-processing marks can cause alignment issues and shifted holes during stapling or folding, resulting in suboptimal document quality.
Innovation Solution
The apparatus is configured with separate sheet storages for new and image-decolored sheets, where the controller manages sheet feeding sources to prevent automatic switching during jobs involving post-processing, ensuring new sheets are used until exhausted, and stopping the image forming process when new sheets run out, while allowing switching for jobs without post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the automatic switching function is used to switch from new sheets to reused sheets during a job, then sheet supply continuity is improved, but post-processing precision deteriorates
Solution Approach 1:
The system dynamically adjusts the sheet feeding source based on the job type. For jobs requiring post-processing, the system maintains a fixed state using only new sheets from the first cassette. For jobs without post-processing, the system enables dynamic switching to reused sheets when the first cassette is exhausted. This dynamic control resolves the contradiction by adapting the sheet source selection to the specific processing requirements.
Solution Approach 2:
The system applies different quality standards to different sheet sources based on the job requirements. New sheets from the first cassette are designated for high-precision post-processing jobs, while reused sheets from the second cassette are designated for jobs without post-processing. This local quality differentiation ensures that sheet quality matches the processing requirements, resolving the precision issue while maintaining productivity.
2Adaptability or versatility
If reused sheets are used for jobs with post-processing, then resource utilization is improved, but document quality deteriorates
Solution Approach 1:
The system segments the sheet storage into two distinct cassettes: the first cassette for new sheets and the second cassette for reused sheets. This segmentation allows the system to selectively supply sheets from the appropriate cassette based on job requirements. For document production jobs requiring high quality, only new sheets from the first cassette are used, while reused sheets are reserved for non-critical jobs, thus maintaining document quality while improving overall resource utilization.
Data Source
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AI summary
An image forming apparatus includes a first sheet storage, a second sheet storage, an image forming unit, a sheet conveyer configured to convey sheets from the first and second sheet storages to the image forming unit, and a controller. The controller is configured to set new sheets as a type of sheets stored in the first sheet storage and image-decolored sheets as a type of sheets stored in the second sheet storage, switch a sheet feeding source from the first sheet storage to the second sheet storage when the first sheet storage runs out of sheets during execution of a first image forming job that includes no sheet post-processing, and stop image forming by the image forming unit when the first sheet storage runs out of sheets during execution of a second image forming job that includes sheet post-processing.