Sheet Feed Roller Dynamics for Detachable Tray Conveyance
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Solution Overview
Problem
Existing image forming apparatuses face challenges in efficiently conveying sheets from detachable sheet feed trays without interrupting the printing process when one tray is detached or partially pulled out, leading to potential jamming and inconvenience.
Innovation Solution
A contact-and-separation mechanism is employed in the conveying roller pair, allowing the driven roller to separate from the driving roller when the tray is detached and reengage upon rotation, enabling seamless sheet conveyance from multiple trays even when one is partially or fully removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sheet feed tray is detachably attached to the image forming apparatus, then the ease of operation is improved, but the reliability of sheet conveyance deteriorates when the tray is detached
Solution Approach 1:
The driven roller is designed to dynamically change its state between contact and separation from the driving roller based on the tray attachment status. When the tray is detached, the driven roller separates to prevent sheet conveyance issues, and when the tray is attached, it contacts the driving roller for normal operation. This dynamic adaptation resolves the contradiction between ease of tray detachment and reliability of sheet conveyance.
2Productivity
If the conveying roller pair maintains continuous contact, then the productivity is improved, but the ease of operation deteriorates when tray detachment is required
Solution Approach 1:
The contact-and-separation mechanism enables the driven roller to dynamically adjust its position. During normal operation, the roller maintains contact with the driving roller for continuous sheet conveyance and high productivity. When tray detachment is needed, the roller automatically separates, allowing easy tray removal without interrupting the printing process for other trays.
3Ease of operation
If the driven roller remains separated from the driving roller, then the ease of operation is improved for tray removal, but the productivity deteriorates due to interrupted sheet conveyance
Solution Approach 1:
The contact-and-separation mechanism segments the operation into distinct states: contact mode for productivity and separation mode for ease of operation. The mechanism allows the driven roller to be in contact with the driving roller during normal printing to maintain productivity, and automatically separates when a tray is removed to facilitate easy operation, then automatically returns to contact mode to resume productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures uninterrupted sheet conveyance and ease of jam removal by allowing sheets to be fed from multiple trays without interrupting the printing process, enhancing user convenience and operational efficiency.
Implementation Method 1
The driven roller contacts the driving roller and is rotated by the driving roller in conjunction with rotation of the driving roller
Data Source
AI summary
A sheet feeding device includes a sheet feed tray, a conveying roller pair, and a contact-and-separation mechanism. The sheet feed tray is detachably attached to a body of an image forming apparatus. The conveying roller pair is disposed in the body of the image forming apparatus, conveys a sheet fed from the sheet feed tray attached to the body of the image forming apparatus, and includes a driving roller and a driven roller. The driving roller is rotated by a drive mechanism. The driven roller is rotated by the driving roller. The contact-and-separation mechanism separates the driven roller from the driving roller in conjunction with detachment of the sheet feed tray from the body of the image forming apparatus and brings the driven roller into contact with the driving roller by the drive mechanism when the sheet feed tray is detached from the body of the image forming apparatus.