Pulse Sequence Generation for High-Resolution Print Synchronization
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Solution Overview
Problem
Existing printing technologies face challenges in achieving high-resolution print products due to inaccuracies in velocity measurement of printing mediums, often resulting from slippage, contamination, or unsteady surfaces, which lead to discrepancies between activation frequency and medium velocity, causing visible disturbances in print images.
Innovation Solution
A device and method that convert a sensor signal into a higher resolution pulse sequence using integrated circuits like FPGAs or CPLDs, allowing for precise control of printing units by generating an output signal with enhanced resolution and error correction mechanisms to adapt quickly to changes in medium velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional encoders (contact-based or optical) are used to determine velocity, then velocity measurement is achieved, but measurement precision deteriorates due to slippage, contamination, or insufficient resolution
Solution Approach 1:
The patent replaces mechanical contact-based encoders with a magnetic field-based measurement system. A magnetic field is generated in the direction of medium movement, and changes in this magnetic field are detected to determine velocity. This substitution eliminates mechanical contact issues such as slippage and wear, providing more reliable and precise velocity measurement without direct mechanical interaction with the medium.
2Productivity
If activation frequency is increased to match higher medium velocity, then print resolution is improved, but synchronization accuracy deteriorates due to velocity fluctuations
Solution Approach 1:
The patent implements a feedback mechanism where the determined velocity is continuously used to adjust the activation frequency of printing units. The system monitors velocity changes in real-time and dynamically adapts the activation frequency to maintain precise synchronization between the medium movement and printing activation, ensuring accurate print positioning even at varying speeds.
Solution Approach 2:
The system dynamically adjusts the activation frequency based on real-time velocity measurements. Rather than using a fixed frequency, the activation frequency is continuously adapted to match the actual medium velocity, allowing the system to maintain synchronization accuracy across varying operating conditions and velocity ranges.
3Speed
If reaction time is reduced to adapt quickly to velocity changes, then synchronization accuracy is improved, but system complexity increases
Solution Approach 1:
The patent replaces complex mechanical encoder systems with a magnetic field-based detection system that inherently provides faster response times. The magnetic field changes can be detected electronically without mechanical inertia or contact delays, enabling rapid velocity measurement and subsequent activation frequency adjustment with minimal system complexity.
Data Source
AI summary
A device for generating an output signal, formed as a pulse sequence, with a sensor and a controller. The sensor generates a sensor signal based on a measurand determined by the sensor. The controller determines a number of pulses of a timing signal that are generated chronologically between two pulse edges of the sensor signal, the timing signal being generated by a timing signal generator. The controller also generates an intermediate timing signal formed as a pulse sequence, where the period duration of the intermediate timing signal is equal to the period duration of the timing signal multiplied with a factor that is equal to the determined number of pulses of the timing signal, divided by a predetermined divisor. The controller generates the output signal based on the intermediate timing signal.