Transfer Belt Braking Unit for Image Deviation Control
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Solution Overview
Problem
The existing transfer systems in image forming apparatuses suffer from image deviation due to fluctuations in the frictional force between the transfer cylinder and the transfer belt, leading to variations in the tensile force and revolution speed of the transfer belt.
Innovation Solution
A transfer system is designed with a braking unit, including a braking roll and an applying unit, positioned downstream of the winding roll and upstream of the driving roll, which applies a braking force to the transfer belt to stabilize its rotation and tensile force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a braking unit is added to stabilize transfer belt tension, then image deviation is suppressed, but device complexity increases
Solution Approach 1:
A braking roll is introduced as an intermediary component between the transfer belt and the driving mechanism. This braking roll applies a controlled braking force to the transfer belt, acting as a mediator to stabilize tension fluctuations without requiring direct modification of the driving roll or transfer cylinder. The braking unit includes a braking roll that contacts the transfer belt and an applying unit that controls the braking force, creating a dedicated tension stabilization mechanism.
Solution Approach 2:
The braking unit dynamically adjusts the braking force parameter applied to the transfer belt based on detected tension fluctuations. By changing the braking force parameter in response to varying frictional forces during image transfer, the system maintains stable transfer belt tension and prevents image deviation while adapting to different operating conditions.
2Speed
If braking force is applied to stabilize transfer belt tension, then revolution speed fluctuation is reduced, but additional energy consumption occurs
Solution Approach 1:
The braking unit applies only the minimum necessary braking force to counteract tension fluctuations and maintain stable transfer belt speed. Rather than applying continuous strong braking, the system uses partial braking action that is sufficient to stabilize tension without excessive energy dissipation, activating the braking force only when tension deviation is detected.
Solution Approach 2:
The braking unit operates with feedback control based on detection of transfer belt tension or speed fluctuations. The applying unit adjusts the braking force according to detected conditions, reducing or eliminating braking when tension is stable, thereby minimizing energy consumption while maintaining speed stability when needed.
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
The introduction of the braking unit effectively suppresses image deviation by stabilizing the transfer belt's revolution speed and tensile force, thereby improving the quality of transferred images.
Implementation Method 1
a braking unit that comes into contact with an inner surface of the transfer belt revolving so that a braking force is applied to the transfer belt
Data Source
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AI summary
A transfer system includes: a transfer belt that has an endless shape and onto which images held by a plurality of image holding bodies are sequentially transferred; a winding roll around which the transfer belt is wound and that rotates by being driven by the transfer belt revolving; a driving roll around which the transfer belt is wound, that is disposed downstream of the winding roll in a revolution direction of the transfer belt and upstream of a portion of the transfer belt onto which the image is transferred, and that applies a drive force to the transfer belt to cause the transfer belt to revolve; a transfer cylinder that is disposed on a side opposite to the winding roll with the transfer belt interposed therebetween and that transfers, to a recording medium transported, the image on the transfer belt while being rotationally driven; and a braking unit that is disposed downstream of the winding roll in the revolution direction of the transfer belt and upstream of the driving roll and that comes into contact with an inner surface of the transfer belt revolving so that a braking force is applied to the transfer belt.