Fuser Sheet Detection Flag Retraction to Prevent Lever Damage
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Solution Overview
Problem
The detecting lever in image forming apparatuses can get in the way during maintenance or material removal when the pressing and fixing rotatable members are separated, risking damage to the lever.
Innovation Solution
A detecting flag is positioned to move relative to the recording material's surface, moving to a retracted position when the fixing device is demounted and to a detecting position when mounted, using a moving mechanism to prevent interference during maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detecting lever is positioned to protrude from the conveyance guide member surface for detection purposes, then the detection function is improved, but the lever may get in the way during maintenance or material removal and risk damage
Solution Approach 1:
The detecting lever is designed to dynamically change its position between a protruding detection position and a retracted safe position. The lever protrudes from the conveyance guide member surface when needed for detection, and retracts when the fixing device is separated to avoid interference during maintenance or material removal, thus resolving the contradiction between maintaining detection functionality and preventing damage risk
Solution Approach 2:
The system performs preliminary action by automatically positioning the detecting lever in the retracted position before maintenance or material removal operations begin. This preliminary retraction prevents the lever from being in the way during these operations, eliminating the damage risk before it can occur
Data Source
AI summary
An image forming apparatus includes an image forming portion, a fixing device detachably mounted on a main assembly of the image forming apparatus and a moving mechanism. The fixing device includes a detecting flag contacting a back surface of the recording material. The detecting flag is positioned in a first position within a conveyance path when the recording material does not exist on the detecting flag and moves in a direction toward the back surface from a front surface relative to the first position when the recording material exists on the detecting flag. The moving mechanism causes the detecting flag to move so as to position the detecting flag in the first position when the fixing device is mounted on the main assembly and in a retracted position when the fixing device is demounted from the main assembly.