Fixing Unit Separation Member Retraction for Jam Clearance
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Solution Overview
Problem
Existing fixing devices in image forming apparatuses face challenges in accurately positioning the separation member relative to rotary members, leading to difficulties in separating the recording material from the nip portion and potential jamming issues due to the protrusion of the separation member.
Innovation Solution
A fixing device with a movable separation member supported by a mechanism that allows it to transition between a separation position and a retraction position, synchronized with the movement of the second rotary member, ensuring precise gap maintenance and facilitating easy jam clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the separation member is positioned close to the rotary member to ensure accurate separation, then separation precision is improved, but the risk of jamming increases due to potential contact between components
Solution Approach 1:
The separation member is made movable between a separation position (close to the rotary member for accurate separation) and a retraction position (farther away to prevent jamming). This dynamic positioning allows the system to switch between high precision mode and safe mode, resolving the contradiction between positioning precision and jamming resistance
Solution Approach 2:
The separation member is positioned in advance at the appropriate location before the recording material arrives. When jamming is detected or anticipated, the separation member is retracted proactively to prevent contact between the rotary member and separation member, thereby preventing jamming before it occurs
2Stability of the object's composition
If the separation member is fixed in position to maintain consistent gap, then positioning stability is improved, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The separation member transitions from a fixed position to a dynamic positionable structure that can adapt between separation position and retraction position based on operational requirements, maintaining stability during normal operation while enabling adaptability when needed
3Productivity
If the separation member protrudes to improve separation efficiency, then separation performance is improved, but the complexity of jam clearance increases
Solution Approach 1:
The separation member can dynamically retract to create clearance space when jamming occurs, making it easier to access and clear jams. After clearance, the separation member returns to its protruding position to maintain high separation efficiency, thus resolving the contradiction between separation performance and jam clearance ease
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 ensures efficient separation of recording materials from the nip portion while allowing for easy jam clearance by maintaining a consistent gap and enabling smooth conveyance, thereby enhancing operational reliability and usability.
Implementation Method 1
a fixing device that heats a toner image borne on a recording material and fix the toner image to the recording material
Data Source
AI summary
A separation member is configured to move from a first position to a second position by a first movement mechanism in conjunction with an operation in which a second rotary member moves from a contact position to a separated position by a second movement mechanism. The first position is a position where the recording material having passed through the nip portion is separable from the first rotary member by the separation member. The second position is a position where a distal end of the separation member is farther from the first rotary member than in the first position. The contact position is a position where the second rotary member comes into contact with the first rotary member. The separated position is a position where the second rotary member is separated from the first rotary member.