Sheet Feeding Apparatus Tray Link Guide Mechanism
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Solution Overview
Problem
Existing sheet feeding apparatuses in image forming devices often malfunction due to the need for continuous force application to maintain the manual feeding tray at specific angles, leading to errors such as misfeeding or double feeding of sheets, and require frequent roller replacement due to friction and dust accumulation.
Innovation Solution
A sheet feeding apparatus with a movable casing, a link unit, and a spring mechanism that allows the sheet stacking unit to rotate between closed, first opening, and second opening positions, guided by specific rails and supporting portions to maintain proper alignment without continuous user force, preventing errors and maintaining accessibility for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the manual feeding tray is made changeable in angle to improve accessibility for maintenance, then maintainability is improved, but the tray may be held at incorrect angles causing sheet feeding errors
Solution Approach 1:
The tray link incorporates a slider that can dynamically move between multiple discrete angular positions (first, second, and third attitudes) along a guide rail, allowing the system to transition between maintenance and operational states while maintaining stability at each position
Solution Approach 2:
The guide rail structure provides mechanical feedback through discrete positioning stops that ensure the tray link settles into predetermined angular positions, preventing intermediate or incorrect angles that would cause sheet feeding errors
2Reliability
If continuous force is applied to the tray to maintain it at the correct angle, then sheet feeding accuracy is maintained, but the system becomes complex and requires constant user intervention
Solution Approach 1:
The spring mechanism automatically applies restoring force to return the tray link to its predetermined angular positions, eliminating the need for continuous user force application or complex active control systems
Solution Approach 2:
The continuous force application requirement is extracted and replaced by discrete positional stops with spring assistance, removing the need for constant user intervention while maintaining positioning accuracy
3Ease of repair
If the tray is opened to a large angle for maintenance, then accessibility to rollers is improved, but the tray may not return to the correct feeding position
Solution Approach 1:
The tray link can dynamically assume different angular positions including a third attitude for maintenance access, with the ability to transition back to the first attitude for normal sheet feeding operations
Solution Approach 2:
The guide rail provides mechanical feedback through discrete positioning stops that ensure the tray link returns to the correct predetermined angular position after maintenance, preventing positioning errors
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
Prevents sheet feeding errors and maintains high maintainability by ensuring the manual feeding tray returns to the correct position automatically after maintenance, reducing the risk of misfeeding and allowing easy access to components without tools.
Implementation Method 1
a spring configured to urge said link unit relative to said casing in a closing direction
Data Source
AI summary
A sheet feeding apparatus includes a casing; a sheet stacking unit rotatable between a closing position and first and second opening positions; a sheet feeding unit; a link unit provided with a slidable engaging portion; and a spring. The sheet stacking unit includes a first guide; and a second guide branching from the first guide. The first guide includes a first portion, a first supporting portion, and a second portion. The second guide includes a second supporting portion. The engaging portion is guided from the second guide to the first portion of the first guide by the sheet stacking unit being closed from the second opening position, and the engaging portion is guided from the first portion of the first guide to the second portion by way of the branch portion by the sheet stacking unit being opened from the closed state.