Image Forming Apparatus Sheet Conveying Speed Synchronization
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Solution Overview
Problem
Conventional image forming apparatuses fail to properly interrupt double-sided circulation during printing of images with different resolutions, leading to sheet jams due to mismatched conveying speeds.
Innovation Solution
An image forming apparatus that decides the conveying speed based on the resolution of the images and compares the conveying speeds of subsequent and previous sheets to control the feeding timing, ensuring proper synchronization and preventing jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If double-sided circulation control is executed based on paper size and paper type only, then the control is simple, but sheet jams occur when conveying speeds change between printing sheets with different resolutions
Solution Approach 1:
The invention changes the control parameter from paper type to conveying speed. The control unit determines whether to interrupt double-sided circulation by comparing conveying speeds of previous and subsequent sheets, rather than relying on paper type classification. This parameter change directly addresses the root cause of sheet jams while maintaining control simplicity.
Solution Approach 2:
The invention introduces feedback control by comparing the conveying speed of the subsequent sheet with the conveying speed of the previous sheet. The control unit uses this feedback information to dynamically decide whether to interrupt double-sided circulation, ensuring reliable jam prevention without increasing system complexity.
2Manufacturing precision
If conveying speed is switched based on resolution, then printing quality is improved, but double-sided circulation cannot be properly interrupted leading to sheet collisions
Solution Approach 1:
The invention changes the control parameter from paper type to conveying speed. By directly comparing conveying speeds instead of inferring from paper type, the system can accurately detect speed changes caused by resolution switching and properly synchronize sheet feeding to prevent collisions.
Solution Approach 2:
The control unit uses feedback from conveying speed comparisons to dynamically adjust double-sided circulation control. When a speed change is detected between previous and subsequent sheets, the system interrupts circulation to prevent sheet collisions, maintaining reliable synchronization despite resolution changes.
3Productivity
If double-sided circulation is continuously executed, then productivity is improved, but sheet jams occur when conveying speeds change
Solution Approach 1:
The invention makes the double-sided circulation control dynamic by continuously monitoring conveying speeds and interrupting circulation only when necessary. This dynamic approach maintains high productivity during normal operation while preventing sheet jams when speed changes occur, achieving both goals simultaneously.
Solution Approach 2:
The control unit uses feedback from conveying speed comparisons to dynamically adjust circulation control. By monitoring speed changes in real-time and interrupting circulation only when speed mismatches are detected, the system maintains high productivity while preventing sheet jams.
Data Source
AI summary
The number of circulatable sheets and the conveying speed of a sheet are decided by referring to a storage unit which stores the number of circulatable sheets and the conveying speed of a sheet in correspondence with the type and size of a sheet, and the resolution of an image to be printed. It is determined whether the conveying speed of the feed surface of a sheet to be fed next to the printing unit and that of a feed surface to be refed next to the printing unit coincide with each other. It is determined whether the conveying speed of the feed surface of the sheet to be fed next to the printing unit and that of the feed surface or the refeed surface of a sheet immediately previously fed to the printing unit differ from each other.