Swingable Roller Shaft for Uniform Pressing Force
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Solution Overview
Problem
In printing apparatuses, when multiple driven rollers are supported by a single roller shaft, uneven pressing forces can lead to roller transfer scratches and nip marks on the medium due to inconsistent loading, as some rollers apply more pressure than others.
Innovation Solution
A printing apparatus design featuring a shaft support member with a swingable roller shaft between the first and second driven rollers, where the rollers have through holes with a smaller inner diameter at the center and a cylindrical surface for support, ensuring uniform pressing force by allowing the shaft to swing and stabilize, thus distributing pressure evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple driven rollers are supported by one roller shaft with a taper hole, then the rollers can be held parallel to the driving roller, but the pressing force becomes non-uniform causing roller transfer scratches and nip marks
Solution Approach 1:
The roller shaft is designed to be swingable rather than fixed, allowing it to dynamically adjust its position in response to pressing forces. This dynamic capability enables the shaft to self-adjust and maintain uniform pressing force distribution across all driven rollers, resolving the contradiction between stable alignment and uniform force application.
2Stability of the object's composition
If a taper hole is used in the driven roller, then the roller shaft can be held parallel, but excessive pressing force is applied when not all rollers interpose the medium
Solution Approach 1:
The swingable shaft design allows the system to dynamically respond to the actual interposition state of the medium. When not all rollers interpose the medium, the shaft swings to reduce pressing force on non-contact rollers, preventing harmful effects while maintaining parallel alignment through the swing motion.
Solution Approach 2:
The system uses the pressing force itself to trigger the shaft's swing motion, which then automatically regulates the pressing force distribution. This self-service mechanism eliminates the need for external control systems to prevent roller transfer scratches and nip marks.
3Manufacturing precision
If all driven rollers interpose the medium, then uniform pressing force can be achieved, but the structure becomes complex requiring precise control
Solution Approach 1:
The swingable shaft structure enables the system to self-regulate pressing force distribution without requiring complex external control mechanisms. The physical swing motion automatically adjusts the pressing force based on the interposition state, achieving uniform force application through passive mechanical response rather than active control.
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 ensures a uniform pressing force across all driven rollers, reducing the likelihood of scratches and nip marks by allowing the rollers to swing and stabilize, maintaining consistent pressure distribution during medium transport.
Implementation Method 1
the roller shaft is supported so as to be swingable with the shaft support portion as a support point
Data Source
AI summary
A printing apparatus includes a printing portion for printing on a medium, a driving roller for transporting the medium, a first and a second driven roller which are respectively supported with a gap in one roller shaft in a shaft line direction of the roller shaft and rotate around the roller shaft while pressing the transported medium on the driving roller, and a shaft support member that has a shaft support portion which supports the roller shaft between the first driven roller and the second driven roller. The first and the second driven roller have a through hole into which the roller shaft is inserted and an inner diameter in a roller center portion is smaller than an inner diameter of a roller end portion in the shaft line direction. The roller shaft is supported so as to be swingable with the shaft support portion as a support point.