Document Feeding Device Guide Moving Mechanism for Jam Removal
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Solution Overview
Problem
Conventional document feeding devices struggle to reliably remove jammed documents from the conveying path near the platen without damaging them, as the narrow space and fixed guide members can trap the leading end of the document, making complete removal difficult and potentially causing tears.
Innovation Solution
A document feeding device with a guide moving mechanism that pivots the upstream guide member and slidably moves the downstream guide member away from the opposite guide member, increasing the space near the platen, allowing for easy removal of jammed documents without damage by canceling the nipping between rollers and retracting the guide members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the guide members are fixed to minimize document travel inaccuracy, then document alignment precision is improved, but the leading end portion of a jammed document may be caught in the gap, preventing complete removal
Solution Approach 1:
The guide member is changed from a fixed structure to a movable one. When a document jam is detected, the guide member moves to follow the curvature of the conveying path, creating space for complete document removal. During normal operation, the guide member maintains its position to ensure accurate document alignment, thus resolving the contradiction between precision and removal ease.
2Ease of operation
If the guide cover is opened to cancel roller nipping, then document removal is facilitated, but the leading end portion may remain caught near the platen, requiring forced removal that can tear the document
Solution Approach 1:
Before attempting to remove a jammed document, the guide member is moved in advance to follow the conveying path curvature. This preliminary action creates sufficient space for the entire document to be withdrawn smoothly, preventing the leading end from remaining caught and eliminating the need for forced removal that could tear the document.
3Adaptability or versatility
If the conveying path is bent to discharge documents to a lower tray, then document delivery functionality is improved, but the narrow space near the platen limits the effectiveness of roller nipping cancellation
Solution Approach 1:
Instead of attempting to resolve the space constraint within the horizontal plane, the solution moves the guide member along the curvature of the conveying path, utilizing the third dimension (depth/space along the path curvature). This creates sufficient clearance for document removal while preserving the bent conveying path configuration needed for delivering documents to the lower tray.
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
Enables the safe and efficient removal of jammed documents from the conveying path without damage, ensuring accurate document alignment for reading and maintaining the integrity of the documents during the removal process.
Implementation Method 1
the upstream guide member is configured to pivotally move in a direction in which the document conveying path is opened
Implementation Method 2
a downstream guide member, located between the upstream guide member and the reading platen reading the document, is provided to form a conveying surface that is continuous with a top surface of the reading platen
Implementation Method 3
A guide cover is provided on the document conveying path and comprises a plurality of rollers that nips and feeds out the document
Data Source
AI summary
A document feeding device includes an upstream guide member that forms an upstream side of a document conveying path along which a document is guided from a sheet feeding tray to a platen, and a downstream guide member located between the upstream guide member and the platen. The document feeding device has a guide moving mechanism that slidably moves the downstream guide member away from an opposite guide member located opposite the downstream guide member upon a pivoting operation of the upstream guide member. Consequently, even if the document conveyed toward the platen is, for example, inappropriately conveyed to cause jamming, the document can be easily removed without being damaged.