Fixing Unit Cooling Control for Image Quality and Wait Time
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Solution Overview
Problem
In image forming apparatuses, the non-passage region of the fixing unit can become overheated when printing narrow sheets, leading to potential image defects on wider sheets. To prevent this, a cooling operation is required, but it increases user wait time due to its lengthy duration.
Innovation Solution
An image forming apparatus with a control unit that initiates a cooling process for the fixing unit when an overheating condition is detected. The cooling process is completed according to either a first cooling condition, which is faster, or a second cooling condition, which is slower but ensures higher image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cooling operation is executed on the non-passage region before printing the next sheet, then image defects are prevented, but the user wait time increases
Solution Approach 1:
The patent applies dynamics by making the cooling operation adjustable based on detected conditions. The control unit determines whether to execute a full cooling operation or a reduced cooling operation based on factors such as the type of sheet being printed and the temperature state of the non-passage region. This dynamic adjustment allows the system to optimize between image quality and user wait time in real-time.
Solution Approach 2:
The patent changes the parameter of cooling operation duration and intensity based on detected conditions. When narrow sheets are printed continuously, the system may reduce or skip cooling operations since the non-passage region remains at safe temperatures. When wider sheets are detected, the system executes full cooling operations to prevent overheating. This parameter change resolves the contradiction by adapting the cooling strategy to actual operating conditions.
2Manufacturing precision
If the cooling operation is made more thorough to ensure image quality, then the cooling time increases, but the user convenience decreases
Solution Approach 1:
The patent implements feedback by continuously monitoring the temperature of the non-passage region and the type of sheet being printed. Based on this feedback, the control unit dynamically adjusts the cooling operation. If the temperature is already within safe ranges or if narrow sheets are being printed, the system skips or reduces cooling, improving user convenience. If wider sheets are detected or temperatures are high, the system executes thorough cooling to maintain image quality.
Solution Approach 2:
The system transitions from a static, fixed-duration cooling operation to a dynamic, condition-based cooling strategy. The cooling operation is activated or deactivated based on real-time detection of sheet width and temperature conditions, allowing the system to optimize between manufacturing precision and user convenience according to actual operating conditions.
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 solution reduces user wait time by allowing printing to resume sooner using the faster first cooling condition when a person is detected in the vicinity, while ensuring higher image quality when the second cooling condition is used, even if it extends the wait time.
Implementation Method 1
a cooling process for cooling of the fixing unit
Data Source
AI summary
An image forming apparatus has an image forming unit to form a toner image on a first sheet and a fixing unit configured to heat the first sheet to fix the image to the first sheet. A control unit begins a cooling process for cooling the fixing unit when an overheating condition is met, then permits the image forming unit to form a toner image on a second sheet after the cooling process ends according to a first cooling condition if a person is detected near the image forming apparatus or after the cooling process ends according to a second cooling condition if a person not detected near the image forming apparatus. The cooling process under the first cooling condition ends in less time than under the second cooling condition.