Sheet Transport Register Loop Skew Correction
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Solution Overview
Problem
Existing sheet transport apparatuses face challenges in accurately correcting sheet skew, particularly in the upstream vicinity of the reading section, leading to potential sheet jams and inaccuracies during reading processing, especially with thin materials, due to the positioning of the second register space and increased friction from swinging switching members.
Innovation Solution
The apparatus features a first and second register space positioned on the upstream and downstream sides of the junction between the transport paths, respectively, with a reading front roller pair and guide members forming register loops to correct skew immediately before the reading section, using high-friction and low-friction rollers to stabilize and guide sheets without excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second register space is positioned away on the upstream side of the register roller, then the sheet can be transported through the reverse mechanism, but skew of the sheet newly arises during transport to the reading section
Solution Approach 1:
The patent divides the register space into two distinct segments: a first register space in the first transport path and a second register space in the second transport path. Each register space is positioned at the junction point, allowing independent skew correction for sheets traveling through different paths. This segmentation enables precise skew control for each transport route without interference.
Solution Approach 2:
The patent positions both register spaces at the junction point before the sheet enters the reading section. By correcting skew at this preliminary stage in both transport paths, the system ensures that sheets are properly aligned before reaching the reading section, preventing new skew from arising during final transport.
2Adaptability or versatility
If switching members are arranged to be swingable in portions where transport paths join, then sheet transport flexibility is improved, but friction increases and interferes with sheet transport
Solution Approach 1:
The patent extracts the switching function from mechanical swingable members and relocates it to the register spaces themselves. The register spaces are designed to accept sheets from either transport path without requiring moving switching members, thereby eliminating the friction problem while maintaining path switching capability.
Solution Approach 2:
The patent performs the path selection and sheet guidance action in advance at the register spaces, where sheets are redirected into the appropriate transport path before reaching the reading section. This preliminary guidance eliminates the need for friction-generating switching members during active transport.
3Manufacturing precision
If clearance is formed between guide surfaces for skew correction, then skew correction capability is improved, but adjustment complexity increases
Solution Approach 1:
The patent merges the skew correction function with the register spaces at the junction point. By combining path registration and skew correction into a single integrated structure, the system eliminates the need for separate adjustable clearances between guide surfaces, thereby reducing adjustment complexity while maintaining skew correction capability.
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 accurate and smooth reading processing for both frontside and backside sheet reading by effectively correcting skew and reducing the risk of sheet jams, while allowing for flexible adjustment to accommodate sheets of different thicknesses.
Implementation Method 1
a reading front roller pair, disposed in the upstream vicinity of a reading section that reads a sheet, coming into contact with a front end of the sheet to form a register loop in the sheet
Implementation Method 2
a first transport path extending while being curved toward the reading front roller pair, and a second transport path extending while being curved toward the reading front roller pair
Data Source
AI summary
A sheet transport apparatus that transports a sheet to a reading section for reading the sheet, has a reading front roller pair contacting with a front end of the sheet to form a register loop in the sheet; a first transport path extending curvingly toward the reading front roller pair; a second transport path extending curvingly toward the reading front roller pair after joining the first transport path; a first register space in which a register loop is formed in a sheet guided along the first transport path; and a second register space in which a register loop is formed in a sheet guided along the second transport path. The first register space is provided on the upstream side of a junction position in which the first transport path joins the second transport path, and the second register space is provided on the downstream side of the junction position.