Inkjet Activation Timing Offset for Web Velocity Compensation
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Solution Overview
Problem
Inkjet printing on moving web-shaped work pieces faces challenges during acceleration or deceleration phases due to spatial deviations and register errors, as the synchronization of ink drop firing with the web velocity leads to positioning and registration issues, making it difficult to maintain accurate color printing.
Innovation Solution
A method using an incremental sensor to generate control pulses based on the movement of the web-shaped work piece, which are then offset in time to ensure that the processing device activates at regular intervals, compensating for the delay in ink drop flight time and maintaining precise positioning across varying velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inkjet printing is performed during acceleration or deceleration phases, then productivity is improved by continuous printing, but manufacturing precision deteriorates due to spatial deviations and register errors
Solution Approach 1:
The control device calculates and applies a compensation value before the actual printing occurs. By determining the expected spatial deviation based on acceleration/deceleration parameters and pre-compensating the activation timing of processing devices, the system maintains positioning accuracy during speed changes without interrupting printing operations.
Solution Approach 2:
The system continuously monitors the actual web velocity via incremental sensors and compares it with expected velocity profiles. Based on this feedback, the control device dynamically adjusts the compensation values for processing device activation timing, ensuring accurate positioning even when velocity deviations occur during acceleration or deceleration phases.
2Manufacturing precision
If multiple processing devices are synchronized with web velocity, then manufacturing precision is maintained, but device complexity increases due to separate control systems for each processing device
Solution Approach 1:
The control device consolidates the synchronization control for multiple processing devices into a single unified system. Instead of independently controlling each processing device, the merged control device receives web velocity information and calculates appropriate activation timings for all devices based on a common compensation strategy, reducing overall system complexity while maintaining register accuracy.
Solution Approach 2:
The control device serves multiple functions: it monitors web velocity via incremental sensors, calculates compensation values for different processing devices, determines optimal activation timings, and coordinates synchronization across all processing devices. This multi-functional approach eliminates the need for separate control systems for each processing device.
3Loss of time
If the activation signal is sent immediately, then response time is reduced, but manufacturing precision deteriorates due to the fixed delay between activation and processing action
Solution Approach 1:
The system dynamically adjusts the activation timing of processing devices based on real-time web velocity conditions. Instead of using a fixed delay, the control device calculates variable activation timings that compensate for the processing action delay under different acceleration and deceleration conditions, maintaining positioning accuracy while responding efficiently to web movement.
Solution Approach 2:
The control device changes the timing parameter of activation signals based on web velocity and acceleration/deceleration conditions. By adjusting the activation timing parameter dynamically rather than using a constant delay, the system accounts for the fixed processing action delay while maintaining optimal response time under varying operational conditions.
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 approach allows for accurate and distortion-free multicolor printing during acceleration and deceleration phases, reducing waste and enabling continuous, correct printing by ensuring that processing devices activate at the correct locations on the web-shaped work piece, even at different velocities.
Implementation Method 1
the movement of the web-shaped work piece is sensed with an incremental sensor that generates work pulses
Data Source
AI summary
To activate a processing device which processes a surface of a moving work piece at regular intervals, wherein a predetermined time duration passes between an activation signal of the processing device and the processing on the surface, the movement of the work piece is sensed with a sensor that generates work pulses. A respective control pulse is generated if a predetermined number of work pulses has been generated. A number of the work pulses is repeatedly detected in a respective time interval that corresponds to the predetermined time duration. The activation signals are each generated at each control pulse of a series, and the activation signals are offset forward in time relative to the respective control pulse corresponding to the number of work pulses that have been detected in the respective time interval. The activation signals are output to the processing device.