Document Feeding Device Separation Swinging Member
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Solution Overview
Problem
Document feeding devices often experience paper jams and curling issues when feeding thin documents, as the leading edge of the document can warp or curl due to the pressure from separation rollers, leading to feeding failures.
Innovation Solution
A document feeding device is designed with a separation swinging member and a movable limitation member that can displace in the thickness direction of the document batch, creating a space between the separation member and the document to prevent curling and jamming, while maintaining effective conveying for both thin and thick documents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separation roller is used to separate documents one by one, then document separation is achieved, but the leading edge of thin documents curls or causes paper jams
Solution Approach 1:
The separation member is made displaceable in the thickness direction of the document batch through a separation swinging member, allowing it to dynamically adjust its position. This creates a variable space between the separation member and documents, enabling thin documents to pass through without curling while maintaining separation effectiveness for thicker documents.
Solution Approach 2:
The separation function is divided into multiple components: the separation member for contact separation, the separation swinging member for displacement control, and the movable limitation member for space regulation. This segmentation allows each component to address specific aspects of the separation problem independently.
2Reliability
If a closing unit is added upstream of the nip region to suppress medium jam, then jam prevention is improved, but the conveyed document may not be fed due to load received at the closing unit
Solution Approach 1:
Instead of a fixed closing unit, the separation member is made dynamically displaceable. The separation swinging member allows the separation member to move in the thickness direction, creating adaptive space that prevents jamming without imposing excessive load on thin documents, thus maintaining feeding efficiency.
Solution Approach 2:
The separation swinging member acts as an intermediary mechanism between the fixed structure and the documents. It mediates the interaction by providing controlled displacement, allowing the separation member to adjust its position based on document thickness without directly transmitting excessive load to the documents.
3Reliability
If the separation member maintains constant pressure contact with the feeding unit, then separation effectiveness is improved, but thin documents experience excessive load causing curling
Solution Approach 1:
The separation member transitions from constant pressure contact to dynamic pressure contact. The separation swinging member enables the separation member to displace in the thickness direction, automatically reducing pressure on thin documents while maintaining effective contact for thicker documents.
Solution Approach 2:
The pressure parameter applied by the separation member is made variable rather than constant. Through the separation swinging member, the system changes the pressure parameter dynamically based on document thickness, reducing pressure for thin documents to prevent curling while maintaining separation effectiveness.
Data Source
AI summary
A document feeding device includes a feeding unit feeding documents from a batch of documents on a placing tray, a separation member in pressure contact with the feeding unit and separating documents one by one, a separation swinging member supporting the separation member and displaceable in a thickness direction of the batch of documents, and a movable member supported as to be displaceable with respect to the separation swing member in the thickness direction of the batch of documents, and entering a space formed between the separation member and a document.