Printer Pickup Roller Reverse Rotation for Cassette Removal
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Solution Overview
Problem
Ink jet printers face the issue of medium remaining inside the apparatus main body during cassette removal due to friction resistance between the pickup roller and the medium, leading to incomplete ejection.
Innovation Solution
A printing apparatus design featuring a first roller that reversibly rotates due to frictional force, a displacing mechanism for the third roller, and a pressing mechanism that moves the hopper to a standby position, ensuring the medium is properly ejected by reversing the pickup roller's direction and reducing frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pickup roller presses the medium against friction resistance during cassette removal, then the medium can be securely held during printing, but the medium may remain inside the apparatus main body when the cassette is pulled out
Solution Approach 1:
The pickup roller is designed to rotate in reverse direction during cassette removal. Normally the roller rotates forward to pick up and transport medium, but during cassette removal it rotates backward to reduce friction with the medium, allowing the medium to be easily pulled out with the cassette without remaining inside the apparatus main body
Solution Approach 2:
The pickup roller's rotation direction is dynamically changed based on operational mode. The roller can rotate forward during normal printing operations to securely hold and transport medium, and rotate backward during cassette removal to facilitate easy medium ejection. This dynamic adjustment resolves the contradiction between secure medium holding and easy cassette removal
2Productivity
If the hopper presses the medium against the first roller, then the medium is properly fed during printing, but the medium may remain inside the apparatus main body during cassette removal
Solution Approach 1:
The hopper's pressing force is dynamically adjusted based on operational mode. During normal printing, the hopper presses the medium against the first roller to ensure proper feeding and high productivity. During cassette removal, the pressing force is reduced or released, allowing the medium to be easily pulled out with the cassette without remaining inside the apparatus main body
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
Effectively reduces the likelihood of medium remaining inside the apparatus main body during cassette removal by reversing the pickup roller's rotation and adjusting the hopper's position, facilitating complete ejection and simplifying the transmitting mechanism's structure.
Implementation Method 1
the first roller is rotatable in a reverse rotating direction opposite to a rotating direction of the driven rotation due to the frictional force with the pulled out medium
Data Source
AI summary
A printing apparatus is provided which is capable of reducing a concern that a medium may remain inside an apparatus main body at the time of pulling out a medium accommodating member.