Adjustable Magnetic Cylinder for Register Deviation Correction
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Solution Overview
Problem
Existing devices for aligning magnetic or magnetizable particles in printing ink or varnish struggle with accuracy and flexibility, particularly in correcting format-related distance changes and systematic register deviations, which can lead to suboptimal optical effects in optically variable image elements, especially when dealing with deformations or changes in printing material width.
Innovation Solution
A device featuring a cylinder with a matrix-like arrangement of magnetic elements on its circumference, allowing independent axial adjustment of each group of magnetic elements, enabling precise alignment and correction of register deviations to ensure accurate optical effects across the printing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If magnetic elements are arranged in fixed support rings, then the device structure is simple, but the ability to correct format-related distance changes and register deviations is insufficient
Solution Approach 1:
The magnetic elements are divided into multiple independent groups, with each group mounted on separate axially adjustable support rings. This segmentation allows individual groups to be adjusted independently to correct local register deviations, while maintaining overall structural organization through the cylindrical arrangement.
Solution Approach 2:
The support rings are made axially adjustable, transforming the static fixed arrangement into a dynamic adjustable system. This enables the magnetic elements to be repositioned axially to compensate for format-related distance changes and systematic register deviations during operation.
2Measurement precision
If magnetic elements are made individually adjustable, then alignment precision improves, but the device complexity increases
Solution Approach 1:
The magnetic elements are organized into groups mounted on common support rings, allowing multiple magnetic elements to be adjusted simultaneously as a unit. This reduces the number of independent adjustment mechanisms compared to individual adjustment of each magnetic element, while still enabling precise correction of register deviations.
3Manufacturing precision
If the device corrects systematic errors from previous process steps, then optical effect quality improves, but the process time increases
Solution Approach 1:
The magnetic elements are pre-positioned on adjustable support rings during device setup, allowing alignment adjustments to be made before the actual printing process. This preliminary positioning enables correction of systematic errors without requiring time-consuming adjustments during production.
Solution Approach 2:
The axially adjustable support rings enable quick and easy repositioning of magnetic element groups during setup and calibration phases, allowing operators to rapidly correct systematic deviations before production begins, minimizing overall process time.
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 solution enhances the accuracy and flexibility of aligning magnetic particles, allowing for improved production of optically variable image elements by correcting format-related issues and ensuring high-quality representation, especially in cases of material deformation or width changes, thereby expanding the range of applications and simplifying the process of converting to narrower panels.
Implementation Method 1
a cylinder with a plurality of elements on the circumference which create a magnetic field
Implementation Method 2
aligning magnetic or magnetizable particles contained in the printing ink or varnish
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a device for aligning magnetic or magnetisable particles (P) which are contained in a coating agent (06), said device comprising: a cylinder (26) which, in the region of its outer circumference, has, in the form of a matrix, a number of n x m (in words n times m; where n and m are chosen from 0 and 1) elements (24) that provide magnetic fields, or magnetic elements (24) for short, which are arranged one behind the other in m columns extending in the circumferential direction of the cylinder (26) and side by side in n rows extending parallel to the axis, wherein, in several of the columns of magnetic elements (24) arranged one behind the other in the circumferential direction, at least one of the magnetic elements (24) is positioned and/or mounted on a single-part or multi-part cylinder body (29) of the cylinder (26) so as to be adjustable in the axial direction independently of at least one further magnetic element (24) in the same column, and wherein the magnetic elements (24) in these columns are each mounted as a group at or on a common support element (31) and can be varied with the support element (31) as a group jointly and independently of the magnetic elements (24) in an adjacent column with respect to their axial position in or on the cylinder (26). In addition to this device, the invention also relates to a machine for generating optically variable image elements.