Separation Roller Drive Switching for Variable-Thickness Media Feeding
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Solution Overview
Problem
Existing medium transport devices face challenges in reducing device size while effectively handling media of varying thicknesses, particularly in image reading devices where separation rollers require separate drive sources for rotation and pressing force adjustment.
Innovation Solution
A medium transport device utilizing a single drive source to power both the separation roller and the pressing force change portion, incorporating a one-way clutch to switch between driving force transmission states and a pressing force change mechanism, allowing for adaptable separation and manual feeding modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate drive sources are provided for the separation roller and the pressing force change mechanism, then the device can effectively handle media of varying thicknesses, but the device size increases
Solution Approach 1:
The patent combines the drive source for the separation roller and the drive source for the pressing force change mechanism into a single integrated drive source. This merging reduces the number of separate components, thereby decreasing device size while still enabling both separation roller rotation and pressing force adjustment functions to operate effectively for handling media of varying thicknesses.
Solution Approach 2:
The single drive source is designed to perform multiple functions: it drives the separation roller to rotate in both first and second rotation directions, and it also drives the pressing force change mechanism to adjust the pressing force of the pressing member. This multi-functionality allows one component to replace what would traditionally require two separate drive sources, reducing overall device volume.
2Volume of moving object
If a single drive source is used for both the separation roller and pressing force change portion, then device size is reduced, but the complexity of drive force transmission increases
Solution Approach 1:
The patent employs a one-way clutch in the drive force transmission path that can dynamically switch between engaged and disengaged states. When the one-way clutch is engaged, it transmits drive force from the single drive source to the separation roller. When disengaged, it allows the pressing force change mechanism to operate independently. This dynamic switching capability simplifies the overall transmission system compared to requiring two permanently engaged drive sources, while still managing the complexity of dual-function operation.
3Adaptability or versatility
If the separation roller rotates in both first and second rotation directions, then media separation and manual feeding are both enabled, but the drive mechanism becomes more complex
Solution Approach 1:
The patent merges the drive mechanism for bidirectional separation roller rotation with the pressing force change mechanism into a single integrated system driven by one drive source. The one-way clutch enables this merged system to switch between driving the separation roller in the first rotation direction (for automatic media separation), the second rotation direction (for manual feeding), or neither (when pressing force adjustment is needed), thereby achieving multiple functions without requiring separate drive mechanisms for each mode.
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 enables compact device design capable of handling diverse media thicknesses with precise separation control, reducing paper jams, and enhancing user-friendliness through automatic and manual feeding options.
Implementation Method 1
a one-way clutch that switches between a driving force transmission state in which the driving force is transmitted to the separation roller and a driving force non-transmission state in which the driving force is not transmitted to the separation roller
Implementation Method 2
a separation roller that nips the medium with the feeding roller to separate the medium
Data Source
AI summary
A medium transport device includes: a feeding roller that feeds a medium mounted on a medium mounting section; a separation roller that nips the medium with the feeding roller to separate the medium and is configured to rotate in a first rotation direction in which the medium is transported downstream and a second rotation direction that is opposite to the first rotation direction; a pressing member that presses the separation roller against the feeding roller; a pressing force change portion that changes a pressing force of the pressing member; and a single drive source that generates a driving force for the separation roller and a driving force for the pressing force change portion.