Document Alignment Roller Mechanism for Skew Reduction
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Solution Overview
Problem
Document processing systems face challenges in aligning documents of different lengths and widths, leading to skew, double feed errors, and processing errors due to the need for manual alignment, which is time-consuming and prone to errors.
Innovation Solution
The system employs alignment rollers that intermittently contact documents to move them to an alignment surface, followed by a feed roller that feeds the documents in the document feed direction, eliminating the need for manual alignment and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual alignment is performed to position documents correctly, then alignment precision is improved, but processing time increases and productivity decreases
Solution Approach 1:
The alignment surface is positioned at a location where documents naturally accumulate before feeding, allowing documents to self-align against the alignment surface during the natural document accumulation process. This preliminary alignment action eliminates the need for separate manual alignment operations while maintaining alignment precision.
Solution Approach 2:
The system uses the documents themselves and the alignment surface geometry to achieve alignment without external intervention. Documents naturally abut against the alignment surface due to the feeding mechanism's motion, causing self-alignment of multiple documents based on their leading edges.
2Productivity
If documents are fed without alignment, then processing speed increases, but alignment precision deteriorates causing skew and double feed errors
Solution Approach 1:
The alignment surface extends in the document feed direction (along the length of documents) rather than across the width, creating an alignment reference in the dimension parallel to feed motion. This allows documents to align along their leading edges without impeding the feed speed.
3Manufacturing precision
If alignment surfaces extend across the entire document width, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The alignment function is extracted from complex active alignment mechanisms and implemented through a simple geometric alignment surface. The alignment surface is merely a structured feature of the feed table, requiring no additional actuators, sensors, or control systems.
4Productivity
If multiple documents are processed simultaneously without alignment, then productivity increases, but error rate increases due to skew and double feed
Solution Approach 1:
Documents are pre-aligned against the alignment surface during the natural accumulation phase before simultaneous feeding begins. This preliminary alignment ensures that when multiple documents are fed together, their leading edges are properly positioned, preventing skew and double feed errors.
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 solution automates document alignment, reducing manual intervention, minimizing errors, increasing processing efficiency, and saving costs by avoiding reruns and rejected documents.
Implementation Method 1
an alignment roller supported to rotate about an axis and intermittently contact a document in the document staging area while rotating to move the document to abut the alignment surface
Implementation Method 2
a feed roller support to rotate in the document feed direction to feed the document in the document feed direction after the alignment roller has rotated to move the document to abut the alignment surface
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
The present disclosure involves systems and methods for performing automatic document alignment. One example system includes a document staging area including an alignment surface extending in a document feed direction; an alignment roller supported to rotate about an axis and intermittently contact a document in the document staging area while rotating to move the document to abut the alignment surface; and a feed roller support to rotate in the document feed direction to feed the document in the document feed direction after the alignment roller has rotated to move the document to abut the alignment surface.