Movable Drive Roller Axial Stabilization for Duplex Feeding
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Solution Overview
Problem
Existing sheet feeding apparatuses experience fluctuations in roller movement due to differences in peripheral speed between rollers, leading to inefficiencies in sheet feeding, particularly in duplex printing modes where reverse rotation and re-feeding mechanisms are involved.
Innovation Solution
The apparatus incorporates a first drive roller with a movable roller portion and a second drive roller rotating at a higher peripheral speed, featuring a protrusion and recessed design with cam surfaces to stabilize the first roller's movement and ensure consistent sheet feeding, reducing fluctuations in both axial and rotational directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the first drive roller and second drive roller have different peripheral speeds, then the sheet feeding apparatus can handle duplex printing modes with reverse rotation, but fluctuations in roller movement occur in both rotation and axial directions
Solution Approach 1:
The roller portion is designed to be movable relative to the drive shaft in both axial and rotation directions, transforming the rigid structure into a dynamic one. This allows the roller portion to automatically adjust its position and orientation in response to speed differences between the first and second drive rollers, thereby maintaining stable sheet feeding during duplex printing operations without requiring complex control mechanisms
Solution Approach 2:
The drive roller is divided into two independent components: the drive shaft that receives the drive force and the roller portion that contacts the sheet. This segmentation allows each component to perform its specific function independently - the drive shaft provides rotational motion while the movable roller portion adjusts to speed variations, resolving the contradiction between adaptability and stability
2Stability of the object's composition
If the roller portions are made movable relative to the drive shaft, then fluctuations in roller movement are reduced, but the device complexity increases due to the protrusion and recessed portion mechanism
Solution Approach 1:
The protrusion on the drive shaft and the corresponding recessed portion on the roller portion create a self-regulating mechanism. As the roller portion experiences movement fluctuations, the protrusion-r recessed portion interaction automatically guides and stabilizes the roller portion's position without requiring external control systems, sensors, or actuators, thus achieving stability enhancement with minimal added complexity
Solution Approach 2:
The protrusion and recessed portion act as intermediary elements that mediate between the drive shaft and the roller portion. These simple geometric features transmit and regulate the interaction between the two components, enabling the complex movable behavior to be achieved through basic mechanical elements rather than sophisticated mechanisms
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
This configuration enhances the stability and efficiency of sheet feeding by minimizing fluctuations in the first roller's movement, ensuring consistent feeding speed and reducing the risk of improper sheet alignment, particularly in duplex printing modes.
Implementation Method 1
The peripheral wall of the recessed portion includes a cam surface at a forward portion of the peripheral wall in the rotation direction, the cam surface being configured to contact a side surface of the protrusion
Data Source
AI summary
A sheet feeding apparatus includes a first drive roller and a second drive roller disposed downstream of the first drive roller and configured to rotate at a peripheral speed greater than a peripheral speed of the first drive roller. The first drive roller includes a drive shaft and a roller portion. The roller portion is configured to contact the sheet and is movable relative to the drive shaft in an axial direction and a rotation direction of the drive shaft. One of the drive shaft and the roller portion of the first drive roller includes a protrusion protruding toward the other one of the drive shaft and the roller portion. The other one of the drive shaft and the roller portion of the first drive roller includes a recessed portion. The recessed portion includes a peripheral wall that defines an opening such that the protrusion is positioned in the opening.