Image Forming Apparatus Fixing Unit Retention for Jam Removal
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Solution Overview
Problem
The fixing unit in existing image forming apparatuses is prone to dropping from its arm members when subjected to strong external forces, such as during sheet jam removal, posing a risk of damage and usability issues.
Innovation Solution
The image forming apparatus is designed with a moving unit that supports the fixing unit, allowing it to be moved to a second position, and includes restricting members and locking mechanisms to prevent dropping, enhancing usability and safety during maintenance and jam removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fixing unit is made detachable and movable for maintenance access, then ease of operation is improved, but reliability deteriorates due to risk of dropping when strong external force is applied
Solution Approach 1:
The fixing unit is segmented from the main apparatus body, allowing it to be detachably mounted on the arm members. This segmentation enables independent removal of the fixing unit for maintenance while keeping the rest of the apparatus intact, resolving the contradiction between maintenance accessibility and operational reliability.
Solution Approach 2:
The locking mechanism is designed to automatically engage and secure the fixing unit to the arm members before any operation occurs. This preliminary locking action prevents the fixing unit from dropping during sheet jam removal or other operations requiring strong external force, while still allowing easy detachment when needed for maintenance.
2Ease of operation
If the fixing unit is made detachable for easy maintenance, then ease of operation is improved, but device complexity increases due to additional mounting and locking mechanisms
Solution Approach 1:
The locking and mounting functions are extracted as separate, dedicated components (locking members and restricting members) rather than being integrated into the main arm structure. This extraction simplifies the overall design by making each component's function clear and easy to implement, reducing unnecessary complexity while enabling easy detachment.
Solution Approach 2:
Instead of designing a complex release mechanism that requires multiple steps to detach the fixing unit, the invention uses a simple locking mechanism that automatically engages during attachment. The detaching operation is simplified to merely overcoming the locking force, inverting the complexity from the release side to the attachment side, which is inherently simpler.
3Ease of operation
If the fixing unit is positioned closer to the opening portion for accessibility, then ease of operation is improved, but stability worsens due to increased risk of dropping
Solution Approach 1:
The arm members serve as intermediaries between the fixing unit and the apparatus body. These arms provide a stable mounting structure that positions the fixing unit close to the opening portion for easy accessibility while maintaining position stability through the locking members that prevent dropping during operations.
Solution Approach 2:
The restricting members and locking members are designed to apply preliminary counteracting forces that prevent the fixing unit from dropping before any external force is applied. This preliminary anti-action stabilizes the fixing unit in its accessible position, allowing it to be positioned close to the opening without compromising stability.
Data Source
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AI summary
An image forming apparatus (1) includes an apparatus body (1A) provided with an opening portion (9), an opening/closing member (20) supported to be openable and closable between a closed position and an open position, a fixing unit (80), and a moving unit (140) provided in the apparatus body (1A) and configured to move the fixing unit (80) from a first position toward a second position. A movement of the fixing unit (80) from the first position to the second position is restricted in a state in which the opening/closing member (20) is positioned at the closed position. The moving unit (140) includes a support portion (90) configured to support the fixing unit (80) positioned at the second position, and a restricting portion (112L, 112R) configured to restrict dropping of the fixing unit (80) supported by the support portion (90) from the support portion (90).