Alphanumeric Labelling Device Stepper Motor Positioning
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Solution Overview
Problem
Existing securities printing technologies face challenges in reliably and securely setting alphanumeric characters, often requiring complex mechanical and electrical components that increase technical effort and risk of errors.
Innovation Solution
A device utilizing stepper motors and sensor systems for precise positioning of alphanumeric characters, combined with an electromechanically actuated locking mechanism to secure positions, ensures reliable and secure character placement with reduced complexity in rotating parts and electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual numbering wheels are driven by independent drive motors with complex sensor and locking systems, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The device is divided into multiple independently driven numbering wheels, each with its own drive motor. This segmentation allows each wheel to be positioned and controlled separately, achieving high positioning accuracy for specific characters while maintaining modular simplicity. Each wheel can be independently adjusted without affecting others, resolving the contradiction between precision and complexity.
Solution Approach 2:
The numbering wheels are pre-calibrated with alphanumeric characters positioned at specific angular intervals. This preliminary preparation allows the system to achieve accurate character positioning simply by rotating each wheel to the appropriate angle, eliminating the need for complex real-time positioning systems during operation.
2Reliability
If multiple sensors and electronic monitoring systems are added to monitor wheel positions, then reliability of character setting is improved, but technical effort and complexity increase
Solution Approach 1:
Optical sensors are positioned to detect reference marks on each numbering wheel, providing feedback on the actual position of each wheel. This feedback mechanism allows the control system to verify that each wheel is correctly positioned before printing, ensuring reliable character setting while using simple optical detection rather than complex monitoring systems.
Solution Approach 2:
The patent replaces complex mechanical positioning sensors with optical sensing systems. The optical sensors detect the position of numbering wheels by reading optical patterns or reference marks, substituting mechanical contact-based sensing with non-contact optical detection, thereby improving reliability while reducing mechanical complexity.
3Reliability
If a locking mechanism with spring force and coil actuation is used to secure wheel positions, then security of character placement is improved, but device complexity increases
Solution Approach 1:
The locking mechanism uses spring force to automatically engage locking elements with corresponding grooves on the numbering wheels when the wheels are in the correct position. This self-acting mechanism secures the wheels without requiring continuous external actuation, improving reliability while maintaining simplicity through passive mechanical engagement.
Solution Approach 2:
The locking mechanism operates periodically - the spring-loaded locking elements engage with the numbered wheels at discrete positioning points during rotation. This periodic engagement occurs only when wheels are correctly positioned, providing secure character placement at critical moments without requiring continuous complex control.
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 enables reliable and secure alphanumeric marking of securities with improved positioning accuracy and reduced technical effort, ensuring high-quality character placement and minimizing errors.
Implementation Method 1
drive means with a drive motor (12) designed as a stepper motor, by means of which the marking tool (02) can be rotated about the axis (11)
Implementation Method 2
an additional sensor device (23), in particular a Hall sensor, which interacts with at least one number (im,r) of marks (Mm,r)
Implementation Method 3
locking element (31), which can be moved by an electromechanically actuated drive means (32)
Data Source
Figure 1
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AI summary
The invention relates to a device for the alphanumeric labelling (01) of printed products, comprising a shaft (11) mounted in a frame (03), about which at least one wheel- or ring-shaped labelling tool (02) is rotatably mounted having multiple i.e. a number k formula (I) of alphanumeric characters (Zz) arranged after one another on the outer circumference thereof, as well as comprising a drive means having a drive motor (12) designed as a stepper motor (12), with which the labelling tool (02) can be rotated about the shaft (11), wherein the drive motor (12) is connected via signals to data-processing and/or storage means of a control unit (22), in which an assignment instruction (V) is provided between the working positions of the alphanumeric characters (Zz) or of fields (Ff) carrying the alphanumeric characters (Zz) and the number of steps (i; im) of the stepper motor (12), and wherein the drive motor (12) is/can be controlled to transfer an alphanumeric character (Zz) to be printed or the relevant field (Ff) into a working position by means of the control unit (22) using this provided assignment instruction (V) in relation to a number of steps (Δi; Δj) to be made.