Door-Linked Engagement Mechanism for Fixing Unit Detachment
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Solution Overview
Problem
Existing image forming apparatuses require significant time and effort to detach the fixing device due to the integration of a gear train mechanism, which complicates maintenance operations.
Innovation Solution
An image forming apparatus with a pressure releasing mechanism that allows the fixing device to be detached by releasing the urging force at the fixing nip portion in conjunction with the opening of a door, utilizing an engagement mechanism that includes a first and second opening/closing member and a pressure releasing mechanism to facilitate easy detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gear train mechanism is integrated between the door arm member and the fixing device, then the pressing force of the fixing device is released in conjunction with door opening for jam recovery, but the fixing device cannot be detached without detaching gears, which takes much time and effort during maintenance
Solution Approach 1:
The patent divides the pressure release mechanism into separate components: a door arm member that moves with door opening and a pressure release mechanism with engagement portions. The engagement mechanism includes a first engagement portion on the door arm member and a first engaged portion on the pressure release mechanism, allowing independent operation of door opening and fixing device detachment without requiring gear train disassembly
Solution Approach 2:
The patent extracts the gear train mechanism from the pressure release system and replaces it with a direct engagement mechanism. The engagement portions are designed to engage and disengage independently of the fixing device attachment, allowing maintenance personnel to detach the fixing device quickly without dealing with complex gear assemblies
2Extent of automation
If the engagement mechanism components are positioned to engage during door opening, then pressure is released automatically, but the first engagement portion may interfere with fixing device detachment if not properly positioned
Solution Approach 1:
The patent positions the first engagement portion and first engaged portion in specific spatial relationships. The first engagement portion is positioned on a second opening side of the first engaged portion, and the first engagement portion is retreated from a path of the first engaged portion when the fixing unit is detached. This spatial arrangement in multiple dimensions enables automatic pressure release during door opening while preventing interference with fixing device detachment
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
Enables quick and efficient replacement of the fixing device without impairing the workability of the apparatus, simplifying maintenance processes.
Implementation Method 1
an urging member configured to apply urging force to bring the pressure member and the heating unit into pressure contact with each other
Implementation Method 2
a pressure releasing mechanism configured to reduce or release the urging force applied to the fixing nip portion, and an engagement mechanism engaging with the pressure releasing mechanism and the first opening/closing member
Data Source
AI summary
An image forming apparatus includes an apparatus main body having an engagement mechanism and a second opening and further includes a fixing unit having a pressure releasing mechanism. The engagement mechanism includes a first engagement portion. The pressure releasing mechanism includes a first engaged portion engaging with the first engagement portion. In a process in which a first opening/closing member is opened from a closed state, the first engagement portion positioned on a second opening side of the first engaged portion pushes the first engaged portion from the second opening side to reduce or release an urging force applied to a fixing nip portion. In a state where the first opening/closing member is closed, the first engagement portion and the first engaged portion are disengaged, and the first engagement portion is retreated from a path of the first engaged portion when a fixing unit is detached from the second opening.