Smart Pick Control Algorithm for Image Forming Devices
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Solution Overview
Problem
Image forming devices face challenges in accurately moving media sheets along a short media path to synchronize with toner images, leading to potential print defects due to limited correction capabilities and timing inaccuracies.
Innovation Solution
A control method and device using a pick mechanism with a motor and encoder system that adjusts the rotational speed based on sensor signals to precisely move media sheets from an input area into a media path, ensuring timely and accurate alignment with toner images at the second transfer area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the media path is shortened to reduce device size, then the overall device size is reduced, but the timing accuracy of media sheet movement deteriorates
Solution Approach 1:
The system dynamically adjusts the pick mechanism speed based on real-time sensor feedback. The media sheet position is continuously monitored, and the pick mechanism speed is modulated to compensate for timing deviations, enabling accurate positioning despite the short media path length.
Solution Approach 2:
A sensor system provides feedback on the media sheet position and movement timing. This feedback is used by the control system to adjust the pick mechanism speed, creating a closed-loop control system that maintains timing accuracy even with a shortened media path.
2Productivity
If the pick mechanism speed is increased to improve productivity, then the output rate is improved, but the synchronization accuracy with toner image placement deteriorates
Solution Approach 1:
The pick mechanism operates at variable speeds rather than a fixed high speed. The system can accelerate to maintain high throughput while decelerating when precise synchronization is required, optimizing both productivity and accuracy dynamically throughout the operation cycle.
Solution Approach 2:
Real-time sensor feedback on media sheet position enables the control system to adjust pick mechanism speed dynamically. When the media sheet is properly positioned, the system can maintain higher speeds for productivity; when timing deviations occur, the system slows down to restore synchronization, ensuring both high output rate and accurate toner placement.
Data Source
AI summary
A method and device disclosed herein controls the movement of media sheets within an image forming device using a pick mechanism that contacts and moves a media sheet from an input area into a media path. One embodiment controls the rotational speed of the pick mechanism based on a filtered combination of a pick mechanism signal and an encoder signal. An encoder roller positioned to contact the media sheets in the input area senses the movement of the media sheet to generate the encoder signal.