Transfer Belt Speed Profile Control for Ink Misalignment
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Solution Overview
Problem
Existing printing machines face challenges in maintaining constant belt travel speed due to thickness variations in the transfer belt, leading to ink misalignment issues when forming color images, which increases memory usage and arithmetic processing load, causing operational delays and inaccuracies.
Innovation Solution
A printing machine with a transfer belt and ink heads that measures travel speeds at specific points, extracts speed ratio data, and uses this data to control image formation timings, reducing positional deviations and eliminating ink misalignment by recording speed variations as profiles, thereby reducing memory usage and processing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotational speed of the drive roller is kept constant by controlling the motor and gear, then the belt travel speed should be constant, but the belt thickness variance causes the travel speed to vary
Solution Approach 1:
The patent applies feedback by measuring the actual belt travel speed using a sensor and comparing it with the target speed, then adjusting the drive roller rotational speed based on the detected variance to maintain consistent belt travel speed despite thickness variations
Solution Approach 2:
The patent changes the operational parameter (rotational speed of drive roller) dynamically based on detected belt thickness variance, adjusting the speed in real-time to compensate for the thickness variations and maintain constant belt travel speed
2Manufacturing precision
If the belt travel speed varies due to thickness variance, then ink misalignment occurs, but increasing measurement and correction processing increases memory usage and arithmetic processing load
Solution Approach 1:
The patent performs preliminary measurement of belt thickness variance and stores the variance data in memory before image formation, allowing the system to pre-calculate correction values and adjust print timing in advance, reducing real-time processing load
Solution Approach 2:
The patent creates a variance profile (copy of the thickness variation pattern) and uses this profile to determine correction values for multiple images, avoiding the need to perform complex calculations for each individual image and reducing overall processing load
Data Source
AI summary
Disclosed is a printing machine comprising: encoders (311 and 312) configured to detect respective angular velocities of a drive roller and a driven roller as a travel speed of core members inside a transfer belt (160); a DSP (321) configured to extract from a temporal variation in a ratio of the measured speed at each roller speed ratio data (profile data) having a frequency corresponding to the speed ratio of a core portion; profile data memory (332) configured to store the profile data; and a head controller (334) configured to control the timing at which each image is formed by a head unit (110) on the basis of the profile data so that positional deviation among multiple images on the transfer belt (160) may be reduced. The head unit (110) forms multiple images on a record medium under the control of the head controller (334). Thus, an ink misalignment at the time of printing can be prevented with high accuracy by recording a change in the core members inside the belt as a profile, using this profile, and reducing memory usage and arithmetic processing load.