Fixing Unit Transport Timing Control for Temperature Drops
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Solution Overview
Problem
Existing image forming devices face challenges in maintaining a suitable fixing temperature for the recording sheet when the printing command is issued while the temperature is dropping from the fixing temperature to the stand-by temperature, leading to improper timing for transporting the sheet to the fixing unit.
Innovation Solution
An image forming device with a control unit that adjusts the transport timing based on the current temperature of the fixing unit, setting longer stand-by times when the temperature is dropping, ensuring the sheet is transported at the appropriate time to achieve the fixing temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport unit transports the recording sheet immediately after receiving a printing command, then productivity is improved, but the fixing temperature suitability deteriorates when temperature is dropping
Solution Approach 1:
The control unit determines the current temperature state of the fixing unit before transporting the recording sheet. When the temperature is dropping from fixing temperature to stand-by temperature, the control unit preliminarily adjusts the transport timing by setting a longer standby time, ensuring the sheet arrives at the fixing unit when the temperature is appropriate for fixing.
Solution Approach 2:
The standby time before transporting the recording sheet is made dynamic rather than fixed. The control unit adjusts the standby time based on the current temperature state: a first (shorter) standby time is used when temperature is suitable, and a second (longer) standby time is used when temperature is dropping, allowing the system to adapt transport timing to temperature conditions.
2Reliability
If the standby time is extended to ensure fixing temperature, then fixing temperature suitability is improved, but loss of time increases
Solution Approach 1:
The standby time is dynamically adjusted based on the temperature state of the fixing unit. When the temperature is dropping from fixing temperature to stand-by temperature, a longer standby time is used. When the temperature is already suitable (at fixing temperature or rising), a shorter standby time is used. This dynamic adjustment ensures fixing temperature suitability while minimizing unnecessary time loss.
Solution Approach 2:
The control unit changes the standby time parameter based on the temperature state. By monitoring whether the temperature is dropping or suitable, the system switches between different standby time values (first standby time vs. second standby time), optimizing the balance between fixing temperature suitability and time efficiency.
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 allows for the successful execution of the fixing process at a suitable fixing temperature even when the printing command is received during temperature drops, ensuring the recording sheet is fixed correctly.
Implementation Method 1
a fixing unit configured to thermally fix a developer on a recording sheet
Implementation Method 2
a control unit configured to control temperature to maintain the fixing unit at one of a fixing temperature and a stand-by temperature lower than the fixing temperature
Data Source
AI summary
An image forming device comprising a fixing unit for thermally fixing a developer on a recording sheet, a control unit that controls the temperature to maintain the fixing unit at one of a fixing temperature and a stand-by temperature lower than the fixing temperature, and a transport unit that transports the recording sheet to the fixing unit, wherein, when the temperature of the fixing unit has dropped from the fixing temperature to the stand-by temperature, and a printing command is received, the control unit controls the transport unit so as to set a stand-by time to wait before starting to transport the recording sheet after the printing command is received as a second time interval, which is longer than a first time interval of time required for the temperature of the fixing unit to reach the fixing temperature based on information relating to the current temperature of the fixing unit.