Movable Pick Roller Guiding Member for Variable Media Thickness
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Solution Overview
Problem
Image read devices face errors when feeding thin and thick originals from a stacker, as existing technologies struggle to accurately convey and differentiate between the two types of media.
Innovation Solution
A medium conveyance device with a guiding member and a pick roller system that adjusts its position based on the thickness of the original, using a joint unit to transmit rotation force and a fixation mechanism to ensure proper feeding, allowing for the differentiation and appropriate handling of thin and thick originals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single feed mechanism is used for both thin and thick originals, then the device structure is simple, but feeding errors occur when handling different thickness originals
Solution Approach 1:
The guiding member is designed to be movable rather than fixed, allowing it to dynamically adjust its position according to the thickness of the original being fed. This dynamic adjustment enables the same feed mechanism to reliably handle both thin and thick originals by optimizing the guiding position for each case, resolving the contradiction between structural simplicity and feeding accuracy.
2Device complexity
If the pick roller position is fixed, then the mechanism is simple, but it cannot accurately feed both thin and thick originals
Solution Approach 1:
The pick roller's position is made adjustable through the movable guiding member system. As the guiding member moves to different positions based on original thickness, the pick roller can accurately engage with originals of varying thicknesses, achieving precise feeding position accuracy without requiring multiple fixed mechanisms.
3Reliability
If conveyance paths are switched for thin and thick originals, then feeding accuracy improves, but the device complexity increases
Solution Approach 1:
The patent extracts the path switching function from a complex multi-path system and integrates it into the movable guiding member. The guiding member's position alone determines whether thin or thick originals are fed, eliminating the need for separate path switching mechanisms while maintaining feeding accuracy for different original types.
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 device effectively feeds both thin and thick originals by adjusting the pick roller's position, reducing errors and ensuring consistent conveyance rates, thereby improving the reading process for image read devices.
Implementation Method 1
a pick roller that is rotatably supported on the guiding member and that rotates to feed a medium that is placed on a tray to a feed roller
Implementation Method 2
a joint unit that transmits a rotation force from a drive shaft to the pick roller
Data Source
AI summary
A medium conveyance device includes a guiding member that is movably supported on a frame, a pick roller that is rotatably supported on the guiding member and that rotates to feed a medium that is placed on a tray to a feed roller, and a joint unit that transmits a rotation force from a drive shaft to the pick roller.