Document Positioning via Pneumatic Suction and Normal Force
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Solution Overview
Problem
Existing document personalization systems face challenges in accurately positioning security documents, leading to skewed feeding, buckling, and increased risk of rejects and damage, while also requiring complex manual operation.
Innovation Solution
A device with movable positioning means that uses a combination of normal and displacement forces to guide documents into a personalization position, minimizing friction and rotational movements, and featuring a gripper design with resilient contact elements to accommodate varying document sizes and orientations, simplifying the feeding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If friction wheels and/or friction belts are used to transport documents, then documents can be moved from feed position to personalization position, but documents become positioned crookedly and buckle during transport
Solution Approach 1:
The patent replaces the friction-based mechanical transport system with a suction-based system. A suction device creates a vacuum field that holds and transports the document through a suction channel, eliminating the skewing and buckling caused by friction wheels and belts. The suction force distributes evenly across the document surface, maintaining flatness and precise positioning throughout transport.
Solution Approach 2:
The invention employs pneumatic principles by using a suction device that generates negative pressure (vacuum) to grip and transport the document. The suction channel directs the airflow to create a controlled vacuum field on the document surface, enabling precise and damage-free transport without mechanical contact that causes skewing.
2Manufacturing precision
If workpiece carriers or cassettes are used to prevent skewed feeding, then document positioning accuracy improves, but additional manual work is required to insert documents
Solution Approach 1:
The suction device automatically detects and grasps the document placed on the feed surface, eliminating the need for manual insertion into carriers. The system self-adjusts to the document's position and orientation, using the suction field to automatically secure and transport the document without requiring operator intervention to load it into additional holding devices.
3Productivity
If friction-based transport is used, then documents can be moved, but document damage increases due to buckling and skewing
Solution Approach 1:
The patent replaces direct mechanical contact transport with pneumatic suction transport. The suction device holds the document through air pressure differential without physical gripping surfaces that cause buckling. This eliminates the mechanical stress and deformation that lead to document damage while maintaining efficient transport 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
The solution enhances positioning accuracy, reduces document damage, and simplifies the operability of the personalization system by ensuring precise alignment and secure handling of documents, thereby minimizing rejects and operational complexity.
Implementation Method 1
a suction device which can be moved in a longitudinal positioning direction and which can be moved from a release state into an operating state and from the operating state into the release state, in such a way that in an operating state negative pressure can be generated on a draw-in surface of the device
Implementation Method 2
The contact elements are designed to be resilient, allowing them to accommodate varying document sizes and orientations while maintaining secure contact
Data Source
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AI summary
The invention relates to a method and a device for positioning a document, in which the device (1) comprises at least one moveable positioning means and a feed surface (5). Said at least one positioning means can be moved, in a first step of the positioning, such that a force which is normal to the feed surface (5) and a displacement force which is parallel to said feed surface (5) can be exerted, by the positioning means, onto a document placed on the feed surface (5) such that said document placed on the feed surface can be displaced along a first predetermined displacement path in a longitudinal positioning direction (3). Said at least one positioning means can to moved in a further step of the positioning such that a displacement force which is parallel to the feed surface (5) can be exerted, by the positioning means, onto the document placed on the feed surface (5) such that said document placed on the feed surface (5) can be displaced along a further predetermined displacement path in a further predetermined positioning direction.