Pivoting Fixing Unit Frame for Paper Jam Access and Separation
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Solution Overview
Problem
Existing fixing units in image forming apparatuses face challenges in efficiently separating recording materials from heating and pressing rotary members after toner images are fixed, particularly in cases of paper jams, where the separation mechanism can interfere with user access and increase the risk of damage.
Innovation Solution
A fixing unit design featuring a pivotable frame that supports separation members, allowing them to retract and change positions to facilitate easy access for paper jam clearance, while maintaining effective separation of recording materials from both rotary members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separation members are positioned close to the rotary members to ensure effective separation of recording material, then separation reliability is improved, but user access for paper jam clearance becomes difficult and risk of damage increases
Solution Approach 1:
The second frame is configured to pivot between a first position (closed state) and a second position (open state). When pivoted to the second position, the separation members retract from their operational positions away from the rotary members, creating clearance for user access during paper jam situations. This dynamic repositioning resolves the contradiction by making the separation members movable rather than fixed.
2Ease of operation
If separation members are retracted from rotary members to facilitate user access, then ease of operation is improved, but separation effectiveness may be compromised
Solution Approach 1:
The system dynamically adjusts the position of separation members based on operational state. During normal operation, the frame remains in the first position with separation members positioned for effective separation. During paper jam clearance, the frame pivots to the second position, retracting separation members to facilitate user access. This ensures both separation effectiveness and ease of operation at different times.
Solution Approach 2:
The separation members are pre-positioned in optimal locations for separation effectiveness when the frame is closed. Before user access is needed, the system has already configured the separation members at their most effective positions, so when paper jam clearance is required, the frame can simply pivot to retract them without compromising future separation performance.
3Productivity
If the fixing unit structure is made compact to improve space efficiency, then productivity is improved, but access for maintenance and paper jam clearance becomes more difficult
Solution Approach 1:
The pivotable second frame provides a dynamic access mechanism that maintains compact overall dimensions while enabling easy access when needed. The frame can pivot open to provide clearance for user access during paper jams or maintenance, then close back to maintain space-efficient configuration during normal operation. This resolves the contradiction by making the structure adapt its configuration based on operational requirements.
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
Enhances user-friendly paper jam clearance by reducing the risk of manual intervention with moving parts and ensuring seamless separation of recording materials, improving operational efficiency and safety.
Implementation Method 1
a nip portion configured to fix the toner image on the recording material by applying heat and pressure to the recording material
Implementation Method 2
a second frame holding the first separation member, the second separation member, and the conveyance unit, and configured to pivot with respect to the first frame
Data Source
AI summary
A fixing unit includes a first separation member, a second separation member, a conveyance unit, and a second frame. The second frame pivots between a first position and a second position. The first position is a position where the first separation member is at a first separation position, the second separation member is at a second separation position, and the conveyance unit is at a conveyance position. The second position is a position where the first separation member is at a first retracted position, the second separation member is at a second retracted position, and the conveyance unit is at a conveyance retracted position. A distance between the first separation member and the second separation member when the second frame is at the second position is shorter than a distance between the first separation member and the second separation member when the second frame is at the first position.