Auto Document Feeder Tray Positioning for Mixed Size Alignment
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Solution Overview
Problem
Users face difficulties in correctly setting documents of different sizes on an Auto Document Feeder (ADF) tray within a predetermined time, and there is a risk of documents becoming skewed during the process.
Innovation Solution
An image forming apparatus with a document tray that can move between two positions, where the tray is initially positioned closer to a document feed roller upon detection of a document and then returns to its home position when a mixed stacking mode is set, allowing for the correct alignment and placement of documents of varying sizes without shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the document tray moves to the document feed roller position after a predetermined time, then the waiting time for users is reduced, but users cannot correctly set documents of different sizes on the tray within the predetermined time and documents may shift and become skewed
Solution Approach 1:
The document tray is designed to dynamically change its position between two states: a first position for document setting and a second position for document feeding. The control section automatically switches between these positions based on detection of document presence and the mixed stacking mode setting, allowing the system to adapt its behavior to different operational requirements without manual intervention
Solution Approach 2:
The system performs automatic document tray positioning based on sensor detection and mode settings. When a document is detected and mixed stacking mode is active, the control section automatically returns the tray to the first position, eliminating the need for user intervention and ensuring proper alignment without requiring users to manually adjust the tray position or document placement timing
2Manufacturing precision
If the document tray remains at the first position for document setting, then users can correctly align documents of different sizes, but the waiting time for users increases
Solution Approach 1:
The document tray dynamically transitions between the first position (for alignment) and the second position (for feeding) based on real-time detection and mode settings. This dynamic positioning allows the system to optimize for either alignment precision or speed depending on the operational context, resolving the contradiction between maintaining position for accuracy and moving position for efficiency
Solution Approach 2:
The detection section continuously monitors document presence on the tray, and the control section uses this feedback to automatically determine when to move the tray between positions. This closed-loop control ensures the tray is in the optimal position at the right time, providing both adequate time for alignment and rapid response for document feeding without user intervention
3Productivity
If the tray automatically moves to the second position after detection, then productivity is improved, but documents of different sizes cannot be correctly placed without user intervention
Solution Approach 1:
The system automatically manages tray positioning based on detection and mode settings. When mixed stacking mode is detected, the control section autonomously returns the tray to the first position after moving to the second position, eliminating the need for user intervention and making the system as easy to use as simply placing documents on the tray while maintaining high productivity
Solution Approach 2:
The tray's automatic dynamic positioning between first and second positions, controlled by the control section based on detection and mode settings, allows the system to maintain high productivity through automated feeding while ensuring documents of different sizes are correctly placed by automatically returning to the alignment position when needed
Data Source
AI summary
An image forming apparatus comprises a tray, a conveyor, a detector and a movement mechanism. The tray accommodates at least one document. The conveyor conveys the document placed on the tray. The detector detects that the document is placed on the tray. The movement mechanism moves the tray from a first position to a second position closer to the conveyor than the first position based on the detection that the document is placed on the tray, and after moving the tray from the first position to the second position, moves the tray to the first position based on a setting of a mixed stacking mode in which mixing of the documents with different sizes on the tray is permitted.