Dynamic LPF Stage Adjustment for Inkjet Conveyance Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional printing medium conveyance control methods in inkjet printing apparatuses face challenges in achieving accurate positioning both at high-speed conveyance and during stop control, as existing methods either suffer from data correctness issues due to high-frequency variations or fail to filter out noise components effectively.
Innovation Solution
A printing apparatus and method that dynamically adjust the number of stages of a Low-Pass Filter (LPF) based on conveyance velocity, using a combination of count and difference thresholds to determine the appropriate number of stages for accurate position data processing, ensuring accurate conveyance control at various speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the population parameter of data to be moving-averaged in the LPF is increased to filter out noise components, then noise filtering improves, but data correctness lowers when conveying at high speed due to large variations in the moving-averaged data
Solution Approach 1:
The patent dynamically changes the population parameter of the LPF based on the conveyance speed of the printing medium. When conveyance speed is high, the population parameter is reduced to maintain data correctness. When conveyance speed is low, the population parameter is increased to improve noise filtering capability. This dynamic adjustment resolves the contradiction between noise filtering and data correctness across different operating conditions.
Solution Approach 2:
The patent changes the parameter (population parameter) of the LPF according to the conveyance speed condition. By adjusting this parameter based on real-time speed feedback, the system optimizes the balance between filtering noise and maintaining data correctness for the current operational state.
2Measurement precision
If the population parameter of data to be moving-averaged is decreased to maintain data correctness at high speed, then data correctness improves, but noise components can hardly be filtered out
Solution Approach 1:
The system dynamically adjusts the LPF population parameter based on conveyance speed. At high speeds, the parameter is decreased to maintain data correctness. At low speeds, the parameter is increased to provide effective noise filtering. This dynamic behavior ensures both data correctness and noise filtering are optimized for the current operating condition.
Solution Approach 2:
The population parameter of the LPF is changed according to the conveyance speed condition. This parameter adjustment allows the system to prioritize data correctness at high speeds while prioritizing noise filtering at low speeds, resolving the contradiction between these two requirements.
3Ease of operation
If conventional conveyance control methods are used, then simple control is achieved, but accurate positioning at conveyance stop cannot be met
Solution Approach 1:
The patent uses feedback from the encoder to detect the actual conveyance speed and position of the printing medium. This feedback information is used to dynamically adjust the LPF population parameter and to control the conveyance motor for accurate positioning. The feedback mechanism enables the system to achieve both accurate stop positioning and adapt to varying operational conditions.
Solution Approach 2:
The patent replaces simple mechanical conveyance control with a sophisticated control system that uses encoder feedback, digital signal processing, and dynamic parameter adjustment. This substitution of mechanical simplicity with electronic/intelligent control enables accurate positioning while maintaining ease of operation through automated control algorithms.
Data Source
AI summary
An apparatus is provided. The apparatus comprises: an acquiring unit configured to acquire data generated at a predetermined period in accordance with driving of a conveyance unit configured to convey a printing medium; a first specify unit configured to specify an average value of the data based on a plurality of data acquired by the acquiring unit; a second specify unit configured to specify a conveyance velocity of the printing medium based on the average value of the data specified by the specify unit; a deciding unit configured to decide a number of data, used by the second specify unit, for specifying the average value of the data in accordance with the conveyance velocity specified by the second specify unit; and a control unit configured to control the conveyance unit using the average value of the data specified by the second specify unit as position data of the printing medium.