Image Forming Apparatus Fixing Unit Support for Jam Removal
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Solution Overview
Problem
The fixing unit in existing image forming apparatuses is prone to dropping when subjected to strong external forces, such as during sheet jam removal, due to its pivoting mechanism.
Innovation Solution
The image forming apparatus incorporates a moving unit with a support portion and a restricting portion to stabilize the fixing unit, allowing it to be moved between positions while preventing dropping, and includes a door mechanism that restricts movement when closed to ensure stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the fixing unit is made detachable and movable for maintenance purposes, then ease of repair is improved, but reliability deteriorates due to risk of dropping
Solution Approach 1:
The fixing unit's support mechanism transitions from a static fixed state to a dynamic controllable state. The moving unit enables the fixing unit to be moved between a first position (supported by support portion) and a second position (supported by second support portion), with the opening/closing member acting as a dynamic lock that restricts movement when closed and allows movement when open. This dynamic system maintains reliability during normal operation while enabling ease of repair when needed.
Solution Approach 2:
The opening/closing member serves as an intermediary mechanism between the user's action (opening/closing the door) and the fixing unit's movement state. When the opening/closing member is closed, it restricts the fixing unit's movement, preventing accidental dropping. When opened, it allows the fixing unit to be moved for maintenance. This intermediary control mechanism resolves the contradiction by providing conditional stability.
2Ease of operation
If the fixing unit is allowed to move freely for maintenance access, then ease of operation is improved, but stability worsens due to potential dropping
Solution Approach 1:
The opening/closing member provides preliminary anti-action by restricting the fixing unit's movement before any dropping can occur. When closed, it proactively prevents the fixing unit from moving to an unstable position. This preliminary restriction maintains stability during normal operation, while the system still allows controlled movement when the opening/closing member is deliberately opened for maintenance purposes.
Solution Approach 2:
The system dynamically adjusts the fixing unit's mobility based on the state of the opening/closing member. During normal operation (door closed), the fixing unit is stable and restricted. During maintenance (door open), the fixing unit becomes movable and accessible. This dynamic behavior resolves the contradiction between stability and ease of operation.
3Device complexity
If the pivoting mechanism is simplified for compact design, then device complexity is reduced, but reliability deteriorates due to dropping risk
Solution Approach 1:
The opening/closing member serves multiple functions: it provides user access to the apparatus interior, it restricts the fixing unit's movement when closed, and it allows movement when open. This multi-functionality reduces the need for separate locking mechanisms, maintaining compact design while improving reliability through the movement restriction feature.
Solution Approach 2:
The movement restriction function is merged with the existing opening/closing member rather than adding a separate locking mechanism. The opening/closing member's position (closed or open) directly controls whether the fixing unit can move, combining structural support, access control, and movement restriction into a single integrated system. This merging maintains simplicity while resolving the reliability issue.
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 enhances the usability and safety of the fixing unit by preventing accidental dropping and simplifying maintenance operations, such as jam removal and component replacement, while maintaining a compact design.
Implementation Method 1
configured to fix the toner image to the sheet by applying heat and pressure to the sheet
Data Source
AI summary
An image forming apparatus includes an apparatus body provided with an opening portion, an opening/closing member supported to be openable and closable with respect to the apparatus body between a closed position and an open position, a fixing unit, and a moving unit provided in the apparatus body and configured to move the fixing unit from a first position toward a second position. A movement of the fixing unit from the first position to the second position is restricted in a state in which the opening/closing member is positioned at the closed position and is allowed in a state in which the opening/closing member is positioned at the open position. The moving unit includes a support portion configured to support the fixing unit positioned at the second position, and a restricting portion configured to restrict dropping of the fixing unit supported by the support portion from the support portion.