Image Forming System Speed Synchronization Control
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Solution Overview
Problem
The existing image forming systems face instability in recording material feeding due to fluctuations in the outer diameter of the pressing roller, leading to paper jams and image defects, especially when the downstream discharging device's feeding speed is not synchronized with the upstream image forming apparatus's feeding speed.
Innovation Solution
An image forming system is designed with an image forming apparatus and a discharging device, where the driving speed of the downstream discharging roller is controlled based on the driving speed of the upstream pressing roller, using a controller to maintain a stable feeding speed and prevent excessive flection or pulling of the recording material, thereby stabilizing the feeding state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the pressing roller is heated to maintain fixing temperature, then the fixing function is improved, but the outer diameter fluctuates causing feeding speed instability
Solution Approach 1:
The system uses loop sensors to detect the actual feeding speed and outer diameter fluctuations of the pressing roller, then feeds this information back to the control unit which adjusts the driving speed in real-time to maintain stable feeding despite thermal expansion
Solution Approach 2:
The control unit dynamically changes the driving speed parameter of the pressing roller based on detected outer diameter fluctuations, adjusting the speed to compensate for thermal expansion and maintain constant feeding speed
2Stability of the object's composition
If loop control is implemented for the pressing roller, then the feeding state is stabilized, but the complexity of the control system increases
Solution Approach 1:
The control unit serves multiple functions: it controls the pressing roller's driving speed, manages the discharging roller's driving speed, and coordinates information transfer between control units, reducing the need for separate dedicated control systems
3Ease of operation
If the discharging device operates independently with its own driving source, then the discharging function is improved, but the feeding speed synchronization with the image forming apparatus deteriorates
Solution Approach 1:
The second control unit receives driving speed information from the first control unit and uses this feedback to adjust the discharging roller's speed, ensuring synchronization with the image forming apparatus while maintaining independent control capability
Solution Approach 2:
The system merges the control information flow between the image forming apparatus and discharging device, where driving speed information is transferred between control units to coordinate operation while preserving functional independence
4Speed
If the driving speed of the discharging roller is increased to match the pressing roller, then the feeding speed synchronization is improved, but the recording material may be pulled or excessively flexed
Solution Approach 1:
The system dynamically adjusts the discharging roller's driving speed based on real-time detection of recording material state and loop amount, rather than using a fixed high speed, allowing flexible adaptation to prevent pulling and excessive flection
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 stabilizes the feeding state of the recording material between the image forming apparatus and the discharging device, reducing paper jams and image defects by synchronizing the feeding speeds and maintaining a consistent loop amount, without the need for additional sensors or increased apparatus size.
Implementation Method 1
the pressing roller thermally expands by heating from the fixing film and fluctuates in outer diameter
Implementation Method 2
a degree of flection (bending) of the recording material between the transfer portion and the fixing device is detected using a loop sensor
Data Source
AI summary
An image forming system includes an image forming apparatus and a discharging device. The image forming apparatus includes a first rotatable member, a second rotatable member positioned downstream of the first rotatable member, a first driving portion for driving the first and second rotatable members, and a first controller for controlling the first driving portion. The discharging device includes a third rotatable member, a second driving portion for driving the third rotatable member, and a second controller for controlling the second driving portion. The first controller controls a driving speed of the second rotatable member depending on a driving speed of the first rotatable member and feeds the driving speed of the first rotatable member to the second controller. The second controller controls a driving speed of the third rotatable member depending on the driving speed fed from the first controller.