Medium Ejection Rollers With Reverse-Driven Rigidity Lever
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Solution Overview
Problem
Existing paper ejection devices face challenges in suppressing the size of the sheet ejection mechanism while ensuring adequate rigidity to prevent medium bending during ejection.
Innovation Solution
A medium ejection device with a pair of ejection rollers, a lever, and a motor that adjusts the lever's position to enhance medium rigidity by deformation, using the motor's rotation direction to transmit power to the rollers and lever, and incorporating a lever position adjustment unit with a cam and one-way gear for stable ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a dedicated driving source is used to add rigidity to paper, then the rigidity of the medium is improved, but the size of the ejection mechanism increases
Solution Approach 1:
The motor is designed to perform multiple functions: it drives the ejection rollers for medium ejection and simultaneously drives the lever position adjustment unit through reverse rotation. This multi-functionality eliminates the need for a separate dedicated driving source for the lever, thereby maintaining medium rigidity while suppressing the overall size of the ejection mechanism.
Solution Approach 2:
The patent merges the driving functions by using a single motor to control both the ejection rollers and the lever position adjustment. The motor's rotation direction is controlled to transmit power to different components: forward rotation drives the ejection rollers, while reverse rotation drives the lever position adjustment unit, consolidating multiple functions into one integrated system.
2Strength
If the lever advance position is adjusted, then the medium rigidity is improved, but the device complexity increases
Solution Approach 1:
The lever position adjustment unit is integrated into the existing motor-driven system. The same motor that drives the ejection rollers also drives the lever position adjustment through reverse rotation, eliminating the need for separate adjustment mechanisms and reducing overall device complexity while maintaining the ability to adjust lever advance position for optimal medium rigidity.
Solution Approach 2:
The lever position adjustment unit employs a cam mechanism with a one-way gear that allows the lever advance position to be dynamically adjusted based on medium thickness. The cam profile is designed to provide appropriate advance positions for different media types, enabling the system to adapt to varying medium requirements without adding complex control systems.
3Manufacturing precision
If the motor rotates in the second rotation direction to adjust lever position, then the lever advance position is optimized, but the ejection direction rotation is affected
Solution Approach 1:
The motor operates in periodic cycles, alternating between forward rotation to drive the ejection rollers for medium ejection and reverse rotation to adjust the lever position. This periodic action allows the system to maintain precise lever advance position adjustment while ensuring continuous and stable medium ejection, as the motor returns to forward rotation after each adjustment cycle.
Solution Approach 2:
The lever position adjustment is performed in advance before the ejection process begins. The motor rotates in the second direction to position the lever at the optimal advance position, and then switches to first rotation direction to drive the ejection rollers. This preliminary positioning ensures that the lever is correctly positioned before ejection starts, maintaining both precision and ejection stability.
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
The solution ensures stable ejection by increasing medium rigidity, reducing bending, and maintaining a compact device size without the need for additional power sources, allowing for ejection of media with varying thicknesses and types.
Implementation Method 1
turning of the motor in a first rotation direction rotates the pair of ejection rollers in a direction in which the medium is ejected
Implementation Method 2
turning of the motor in a second rotation direction that differs from the first rotation direction transmits power to the lever position adjustment unit and moves the first lever and the second lever to the advance position
Implementation Method 3
the lever moving in a movement direction from one of the first roller and the second roller to another of the first roller and the second roller to push the medium nipped between the pair of ejection rollers
Data Source
AI summary
A medium ejection device includes a lever that is movably disposed at the position of a pair of ejection rollers including a first roller and a second roller that nip and eject a medium and moves from one of the rollers to another of the rollers to push the medium, a lever position adjustment unit that moves the lever in a movement direction to adjust an advance position, and a motor that transmits power to the pair of ejection rollers. When turning forward, the motor rotates the pair of ejection rollers in the direction in which the medium is ejected. When turning backward, the motor transmits power to the lever position adjustment unit and moves the lever.