Movable Driven Roller Skew Correction in Transport Apparatus
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Solution Overview
Problem
Existing recording apparatuses face challenges in effectively correcting skew of media, such as paper sheets or films, during transport, which affects the accuracy and quality of printing, especially when dealing with rolled or cut sheets.
Innovation Solution
A transport apparatus with a movable driven roller that adjusts its position relative to the transport roller, combined with an urging member to enhance movement stability, allows for effective skew correction by altering the sliding resistance and contact area during forward and reverse transport processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driven roller is not able to be positively separated from the paper feed roller, then the printing paper is nipped by the paper feed roller and the driven roller relatively strongly while being fed, but sliding is not easily caused between the printing paper, the paper feed roller, and the driven roller, making effective skew correction difficult
Solution Approach 1:
The driven roller is made movable in the transport direction relative to the paper feed roller, allowing the nip force to be dynamically adjusted. During skew correction, the driven roller can be positioned to reduce nip force and increase sliding; during normal feeding, it returns to its original position to provide strong nipping. This dynamic adjustment resolves the contradiction between needing strong nipping for reliable transport and needing reduced nipping for effective skew correction.
2Reliability
If the driven roller is movable in the transport direction relative to the transport roller, then sliding between the medium and transport roller can be adjusted to improve skew correction, but the device complexity increases
Solution Approach 1:
The driven roller is made movable in the transport direction relative to the paper feed roller, allowing the nip force to be dynamically adjusted. During skew correction, the driven roller can be positioned to reduce nip force and increase sliding; during normal feeding, it returns to its original position to provide strong nipping. This dynamic adjustment resolves the contradiction between needing strong nipping for reliable transport and needing reduced nipping for effective skew correction.
3Measurement precision
If the axial center of the driven roller is located downstream of the axial center of the transport roller during forward transport, then the contact area between the medium and transport roller is increased improving transport accuracy, but the sliding resistance is increased reducing skew correction effectiveness
Solution Approach 1:
The relative position of the driven roller axial center to the paper feed roller axial center is changed between forward and reverse transport. During forward transport, the driven roller is positioned downstream to increase contact area and reduce sliding. During reverse transport, it is repositioned to create optimal sliding conditions for skew correction. This dynamic repositioning resolves the contradiction between transport accuracy and skew correction effectiveness.
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 precise skew correction, improving the accuracy of medium transport and print quality by reducing the occurrence of failures in skew correction and enhancing the sliding resistance between the medium and transport rollers.
Implementation Method 1
sliding is not easily caused between the printing paper, the paper feed roller, and the driven roller
Data Source
AI summary
A transport apparatus includes a feed unit as an example of a supply unit which supplies a medium in a transport direction, and a transport unit which transports the medium supplied from the feed unit. The transport unit includes a transport roller (a driving roller) which sends the medium, and a driven roller which nips the medium between the transport roller and the driven roller. The driven roller is movable in the transport direction relative to the transport roller.