Image Forming Apparatus Speed Difference Control
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Solution Overview
Problem
Image forming apparatuses face challenges in maintaining an optimal speed difference between the transport and fixing units, leading to issues such as image quality defects due to environmental conditions and changes in the state of components, which affect the loop amount of the recording medium.
Innovation Solution
Incorporating a detector to monitor the load of the driving unit and a controller to adjust the speed difference between the transport and fixing units based on detected load variations, ensuring a predetermined speed difference is maintained by adjusting the second transport speed relative to the first transport speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the speed difference between transport unit and fixing unit is increased to reduce loop amount, then productivity improves, but image quality deteriorates due to inconsistent speed difference under environmental variations
Solution Approach 1:
The control unit continuously monitors the load of the driving unit and detects peak values corresponding to recording medium entry into the fixing unit. Based on this feedback, the system dynamically adjusts the speed difference between transport and fixing units to maintain optimal values despite environmental variations, thereby resolving the contradiction between productivity and image quality
Solution Approach 2:
The system transitions from fixed speed difference to dynamic speed difference adjustment. The control unit modifies the speed difference in real-time based on detected load characteristics and environmental conditions, allowing the system to adapt to changing circumstances while maintaining both high productivity and image quality
2Manufacturing precision
If the speed difference is adjusted to maintain optimal loop amount, then image quality improves, but device complexity increases due to additional detection and control mechanisms
Solution Approach 1:
The control unit utilizes load detection from the existing driving unit without requiring separate measurement systems. The system self-regulates by detecting peak load values during recording medium entry and automatically adjusting speed difference, eliminating the need for additional complex control infrastructure
Solution Approach 2:
The control unit serves multiple functions: it controls the driving unit, detects load characteristics, identifies peak values, and adjusts speed difference. This multi-functionality reduces overall system complexity by consolidating control capabilities into a single unit rather than requiring separate specialized components
3Manufacturing precision
If the loop amount is reduced to improve image quality, then manufacturing precision improves, but the speed difference control becomes more difficult under environmental variations
Solution Approach 1:
The system uses load feedback to automatically determine optimal speed difference values, eliminating the need for manual adjustment or complex control algorithms. The control unit simply responds to detected peak load values by adjusting speed difference accordingly, making the system easy to operate despite environmental variations
Solution Approach 2:
The system replaces complex mechanical speed control mechanisms with electronic/digital control based on load detection. The control unit electronically adjusts the speed difference based on detected load characteristics, simplifying the control system compared to traditional mechanical adjustment mechanisms
Data Source
AI summary
An image forming apparatus includes: a transport unit configured to pinch and transport a recording medium at a first transport speed, a fixing unit configured to fix an image formed on the recording medium while pinching and transporting the recording medium, which is transported by the transport unit, at a second transport speed, a driving unit configured to drive the fixing unit, a detector configured to detect a load of the driving unit, and a controller configured to perform a control to adjust a speed difference between the first transport speed and the second transport speed with respect to a subsequently transported recording medium when the load becomes larger than a reference value after a peak value of the load when the recording medium enters the fixing unit is detected by the detector.