Vacuum Excavation Stamp for Shadow-Free Security Document Positioning
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Solution Overview
Problem
The exact positioning and alignment of security documents in inspection machines for checking security and/or quality features is time-consuming and often requires additional positioning aids, which can shadow the document and hinder accurate measurement.
Innovation Solution
A method using a longitudinal transfer device to position security documents on an excavation stamp with a base plate connected to a vacuum chamber, allowing for secure holding without additional aids, enabling precise alignment and inspection without shadows, utilizing negative pressure to fix the document and alignment elements for reproducible positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional positioning aids are used to position security documents, then positioning accuracy is improved, but measurement precision deteriorates due to shadowing
Solution Approach 1:
The patent removes positioning aids from the inspection area by using a vacuum holding system that secures documents to a movable platform. This extraction eliminates shadowing effects during measurement while maintaining positioning accuracy through the vacuum connection and platform mechanism.
2Stability of the object's composition
If traditional positioning methods are used, then positioning stability is improved, but processing speed deteriorates due to time-consuming alignment
Solution Approach 1:
The vacuum connection is established in advance to secure documents before inspection begins. The movable platform pre-positions documents in the correct location, and alignment elements are pre-configured. This preliminary action enables rapid document handling while maintaining stable positioning throughout the inspection process.
3Reliability
If multiple positioning aids are used, then positioning reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple positioning functions into a single integrated movable platform with vacuum connection. The platform simultaneously provides document holding, positioning, and alignment functions that would traditionally require separate devices. This merging maintains positioning reliability while reducing overall system complexity.
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 rapid, reproducible, and shadow-free positioning of security documents for inspection, allowing for precise measurement and efficient checking of security and/or quality features, with the ability to align and position documents accurately within +/-0.5 mm and +/-0.2° precision.
Implementation Method 1
the excavation stamp having a base plate with bores, which are connected to a vacuum chamber and the security document is held by applying a vacuum to the base plate of the excavation stamp
Implementation Method 2
By building up a negative pressure, in particular a vacuum, it is possible to receive and fix the security document to the base plate
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a method for positioning a security document (14) in a testing apparatus (12) and to a transport conveying device for carrying out the method, for testing at least one security and/or quality feature, in which method the security document (14) is transferred in a transport position by means of a longitudinal transfer device (15) of a transport conveying device (11) along a transport plane (23) into a starting position (42) for a traversing movement by a lifting device (36) of the transport conveying device (11), in which method the security document (14) is picked up from the starting position (42) by a lifting plunger (38) of the lifting device (36) and is transferred into an inspection position (41), which lies outside the transport plane (23), in which method, at least during the traversing movement of the lifting plunger (38), a retaining force is produced between the lifting plunger (38) and the security document (14).