Pick Motor Duty Cycle Control for Thermal Management
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Solution Overview
Problem
Printing device throughput is reduced due to motors operating at high duty cycles, leading to thermal protection activation and subsequent speed reduction, resulting in performance degradation.
Innovation Solution
Implementing a delay in the thermal protection process and operating motors, such as the pick and separation motor, at higher speeds with longer stop durations to reduce duty cycles, thereby increasing the time before reaching an operating temperature threshold and enhancing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If motors operate at high duty cycles to maintain printing speed, then printing throughput is improved, but motor temperature increases leading to thermal protection activation and speed reduction
Solution Approach 1:
The patent applies periodic action by implementing a duty cycle reduction mechanism that alternates between high-speed operation and reduced-speed operation. The motor controller reduces the duty cycle of the pick and separation motor from a first value (higher throughput) to a second value (lower throughput) when temperature thresholds are approached, creating a periodic on-off pattern that prevents thermal accumulation while maintaining acceptable printing throughput
2Productivity
If motor speed is increased to improve throughput, then printing performance is improved, but duty cycle increases leading to earlier thermal protection activation
Solution Approach 1:
The patent applies dynamics by making the motor duty cycle adjustable and adaptive rather than fixed. The system dynamically changes the duty cycle values based on operating conditions, allowing the pick and separation motor to operate at higher speeds when cooling is sufficient and reduce speed when thermal accumulation occurs, optimizing both throughput and thermal management throughout the printing process
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 increases the number of sheets printed at full rated speed, reduces motor heat dissipation, and extends the time before thermal protection activation, improving printing device performance and throughput.
Implementation Method 1
a pick and separation motor for transferring a physical medium from an input tray towards a print zone
Implementation Method 2
operating the pick and separation motor at a pick and separation motor speed that reduces a rate of increase of an operating temperature of the pick and separation motor
Data Source
AI summary
In some examples, printing device performance management may include determining a physical media feed motor speed of operation for a physical media feed motor for a printing device including the physical media feed motor for transferring a physical medium within a print zone of the printing device, and a further motor for transferring the physical medium towards the print zone. For each physical medium that is to be transferred towards the print zone, the further motor may be actuated to transfer the physical medium at a further motor speed that is greater than the physical media feed motor speed to reduce a further motor duty cycle.