Variable Pressing Force Transfer Roll for Image Smear and Peeling
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Solution Overview
Problem
The existing image forming apparatuses face challenges in maintaining optimal pressing forces during the transfer of toner images from a photoreceptor to a recording medium, leading to issues such as smear generation and peeling failures due to variations in adhesiveness and peeling angles, which affect image quality and reliability.
Innovation Solution
A transfer device with a transport belt and a transfer roll that adjusts its pressing force using an eccentric cam mechanism, applying a stronger first pressing force after a predetermined distance to prevent peeling failures and a weaker second pressing force initially to minimize smear generation, controlled by a controller to optimize the transfer process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strong pressing force is applied during the transfer process, then peeling failure is prevented, but smear generation increases
Solution Approach 1:
The pressing force of the transfer roll is made variable rather than constant. The controller dynamically adjusts the pressing force based on the position of the recording medium in the transfer gap, applying a first pressing force during the initial transfer phase and a second pressing force during the peeling phase, thereby resolving the contradiction between preventing peeling failure and avoiding smear generation
Solution Approach 2:
The transfer process is divided into multiple phases with different pressing force requirements. The controller identifies the transfer gap position and applies different pressing forces to different segments of the transfer process: a first pressing force when the recording medium is in the transfer gap and a second pressing force after it has moved a predetermined distance, optimizing both peeling prevention and smear avoidance
2Object-generated harmful factors
If a weak pressing force is applied during the transfer process, then smear generation is minimized, but peeling failure occurs
Solution Approach 1:
The pressing force is dynamically adjusted based on the transfer process phase. The controller applies a weaker second pressing force after the recording medium has moved a predetermined distance to minimize smear generation, while having applied a stronger first pressing force earlier to prevent peeling failure, thus resolving the contradiction dynamically
Solution Approach 2:
The controller applies a first pressing force before the recording medium reaches the optimal peeling position to ensure strong adhesion and prevent peeling failure. This preliminary strong pressing action is followed by a transition to a weaker second pressing force, ensuring both peeling prevention and smear minimization are achieved at appropriate times
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 solution effectively reduces peeling failure occurrence rates and smear generation, ensuring consistent image quality by dynamically adjusting the pressing force based on the paper's position and characteristics, thereby enhancing the overall performance of the image forming apparatus.
Implementation Method 1
an adjusting unit that adjusts a pressing force of the transfer roll against the recording medium; and a controller that controls the adjusting unit so that a first pressing force is stronger than a second pressing force
Data Source
AI summary
A transfer device includes a transport belt that contacts with a photoreceptor, and transports a recording medium; a transfer roll that transfers the toner image formed on a surface of the photoreceptor to the recording medium while pressing the recording medium to the photoreceptor through the transport belt; an adjusting unit that adjusts a pressing force of the transfer roll against the recording medium; and a controller that controls the adjusting unit so that a first pressing force is stronger than a second pressing force. The first pressing force is the pressing force after the recording medium starts to pass through a transfer position of the transfer roll and is moved by a predetermined distance. The second pressing force is the pressing force when the recording medium starts to pass through the transfer position.