Tangential Impeller Vane Design for Banknote Handling
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Solution Overview
Problem
Existing impellers in automatic banknote deposit and withdrawal machines suffer from material fatigue due to high mechanical stresses caused by strong curvature, leading to reduced rigidity and inability to maintain sufficient force on banknotes, resulting in improper functioning.
Innovation Solution
The impeller design features a support area that contacts the base body when exerting force on banknotes, distributing stress uniformly and reducing curvature, with a backward connection angle between the wing and base body, allowing for a larger radius of curvature and reduced mechanical stress, thereby preventing material fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the impeller blades are radially connected to the base body to maintain rigidity, then the structural strength is improved, but the mechanical stress and material fatigue increase due to strong curvature
Solution Approach 1:
Instead of connecting the blade radially to the base body, the invention inverts the connection geometry by connecting the blade tangentially to the base body. This inversion changes the curvature radius from small (radial connection) to large (tangential connection), thereby reducing mechanical stress and material fatigue while maintaining structural strength through the tangential support area contact.
2Force
If the impeller blades are made rigid to exert sufficient force on banknotes, then the force application is improved, but the mechanical stress and curvature radius decrease
Solution Approach 1:
The invention applies local quality by creating a specific support area on the blade that contacts the base body tangentially. This localized contact point provides the necessary structural support to maintain rigidity for force application, while the tangential connection geometry at this local area ensures large radius of curvature and reduced mechanical stress throughout the blade structure.
3Device complexity
If the blade curvature is increased to fit compact design, then the device compactness is improved, but the mechanical stress and stress peaks increase
Solution Approach 1:
The invention inverts the conventional radial connection approach by using a tangential connection of the blade to the base body. This inversion allows the blade to maintain the necessary curvature for compact device design while the tangential geometry ensures a large radius of curvature that distributes mechanical stress uniformly, preventing stress peaks and material fatigue.
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 design ensures a consistent and sufficient force is applied to banknotes while minimizing mechanical stress and fatigue, maintaining the impeller's functionality and extending its lifespan.
Implementation Method 1
the wing can be folded with only a slight curvature, ie. H. a curvature with a large radius of curvature, is elastically deformed
Implementation Method 2
the force exerted by the wing on the note of value is transferred from the wing to the base body over a large area
Implementation Method 3
An impeller is known from the documents JP 2007-091437 A and JP 62-150451 U, in which each vane comprises a pressure area and a support area
Data Source
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AI summary
The invention relates to a device for inputting securities into a container. The device comprises a supply unit for supplying the securities and a stacking unit for stacking the supplied securities. The device further comprises an impeller (10c) for handling the securities. The impeller (10c) comprises a rotatably mounted base body (12c) and at least one vane (14c, 16c) which is rigidly connected to the base body (12c) at one end of a connecting region (20c, 22c). A support region (38, 40) of the vane (14c, 16c) is in contact with the outer surface of the base body (12c) when the vane (14c, 16c) exerts a force upon a security.