Dynamic Roller Pressure Adjustment for Paper Crook
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Solution Overview
Problem
Existing medium transport devices face challenges in accurately adjusting the positional alignment of media in the width direction, particularly when the medium is nipped at a fixed pressure, leading to issues like paper crook and creasing, especially with large-size or thick papers.
Innovation Solution
A medium transport device comprising a first transporter, a second transporter on the upstream side, a positional adjuster for moving both transporters in the width direction while nipping the medium, and a contact pressure adjuster that adjusts the contact pressure based on resistance during width direction movement to ensure precise alignment and minimize creasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the medium is nipped at a fixed pressure for positional adjustment in the width direction, then the positioning function is provided, but accurate positional adjustment cannot be achieved and paper crook or creasing occurs
Solution Approach 1:
The patent applies dynamics by making the contact pressure of transport rollers adjustable rather than fixed. The contact pressure adjusters dynamically modify the pressure applied to the medium based on its thickness, allowing the system to adapt to different paper types and prevent both positioning inaccuracies and paper damage
Solution Approach 2:
The patent changes the pressure parameter of the transport rollers from a fixed value to a variable value that can be adjusted according to medium thickness. This parameter change enables accurate positional adjustment for different paper types while preventing paper crook and creasing by optimizing the contact pressure
2Adaptability or versatility
If the transport pressure is increased to handle thick paper, then the transport capability is improved, but the roller life is reduced and creasing occurs during rocking motion
Solution Approach 1:
The patent applies local quality by differentiating the contact pressure for different rollers based on their position and function. The upstream transport rollers have adjustable contact pressure that can be optimized for thick paper transport, while the registration rollers maintain appropriate pressure for positioning, preventing both transport failures and excessive wear on any single roller
Solution Approach 2:
The patent makes the transport system dynamic by allowing contact pressure adjustment on transport rollers. This enables the system to increase pressure when handling thick paper to maintain transport capability, while reducing pressure during positioning operations to extend roller life and prevent creasing
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 enables accurate positional adjustment and reduced creasing by dynamically adjusting contact pressures, effectively handling various paper types and sizes, including large-size and thick papers, thereby improving the reliability and quality of medium transport.
Implementation Method 1
a first adjuster configured to adjust a position of the medium in a width direction by moving the first transporter and the second transporter in the width direction of the medium with the medium nipped by the first transporter and the second transporter
Implementation Method 2
a second adjuster configured to adjust a contact pressure of the first transporter for the medium and a contact pressure of the second transporter for the medium based on resistance caused when the medium is moved in the width direction
Data Source
AI summary
A medium transport device includes a first transporter configured to transport a medium by nipping the medium along with rotation, a second transporter configured to transport the medium and disposed on an upstream side of the first transporter in a transport direction of the medium, a first adjuster configured to adjust a position of the medium in a width direction by moving the first transporter and the second transporter in the width direction of the medium with the medium nipped by the first transporter and the second transporter, and a second adjuster configured to adjust a contact pressure of the first transporter for the medium and a contact pressure of the second transporter for the medium based on resistance caused when the medium is moved in the width direction.