Fuser Speed Control for Print Defect Minimization
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Solution Overview
Problem
In electrophotographic printers, speed mismatches between the fuser member and the substrate transport assembly can cause image registration errors and print defects due to disturbance forces, and the pursuit of smaller machines limits the size of substrate bubbles, making it challenging to prevent defects without compromising print quality.
Innovation Solution
The fuser assembly's linear speed is controlled to be a fractional amount of the substrate transport assembly's linear speed, with specific fractional ranges for normal, multilayer, and long substrates to maintain optimal bubble size and prevent contact with printer structures, using drive motors and control structures to manage these speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fuser assembly is under driven to create a substrate bubble, then image registration accuracy is improved, but the bubble size increases which may cause print defects
Solution Approach 1:
The patent applies dynamics by making the fuser assembly speed variable rather than fixed. The control system dynamically adjusts the fuser assembly linear speed as a fractional amount of the substrate transport linear speed based on detected substrate characteristics (length, type). This allows the bubble size to be optimized for each substrate, maintaining image registration accuracy while preventing print defects.
2Volume of moving object
If the machine size is reduced, then device compactness is improved, but the maximum allowable bubble size decreases making it harder to prevent print defects
Solution Approach 1:
The patent applies parameter changes by adjusting the fuser assembly linear speed parameter as a fractional amount of the substrate transport linear speed. By changing this speed parameter dynamically based on substrate characteristics, the system optimizes bubble size to fit within the constrained space of compact machines while maintaining print quality and preventing defects.
3Productivity
If the fuser assembly speed is increased to match substrate transport speed, then productivity is improved, but disturbance forces increase causing image registration errors
Solution Approach 1:
The patent applies parameter changes by setting the fuser assembly linear speed as a fractional amount (less than 100%) of the substrate transport linear speed. This parameter adjustment creates a controlled speed differential that generates necessary substrate bubbles for accurate image registration while maintaining high printing speed and productivity.
Data Source
AI summary
A method is provided for operating an electrophotographic printer comprising providing an electrophotographic printer comprising a substrate transport assembly including a substrate transport member and a fuser assembly including a fuser member. The substrate transport assembly is operated such that the substrate transport member is driven at a substrate transport linear speed. The fuser assembly is operated such that an outer surface of the fuser member moves at a fuser assembly linear speed. The fuser assembly linear speed is a first fractional amount of the substrate transport linear speed for at least normal size substrates such that a bubble in a normal size substrate between the paper transport assembly and the fuser assembly is created, and the fuser assembly linear speed is a second fractional amount of the substrate transport linear speed for envelopes. The second fractional amount may be greater than the first fractional amount.