Optical Print Head Retraction Mechanism for Drum Protection
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Solution Overview
Problem
Existing image forming apparatuses face challenges in safely retracting the optical print head to prevent damage to the photosensitive drum and lenses during maintenance, as the small clearance between the lenses and the drum surface increases the risk of contact and damage when replacing consumable items like the photosensitive drum.
Innovation Solution
A movement mechanism that reciprocally moves the optical print head between an exposing position and a retracted position, combined with a cable management system that flexes the cable to prevent it from contacting the apparatus's edges during movement, ensuring safe retraction and maintenance access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical print head is positioned close to the photosensitive drum for exposing, then the imaging precision is improved, but the risk of damage to lenses and drum surface increases during maintenance
Solution Approach 1:
The optical print head is designed to move dynamically between a fixed exposing position and a retracted position. During normal operation, the print head remains at the exposing position with precise alignment to the photosensitive drum. During maintenance, the print head automatically retracts to a safe position, eliminating the need for manual intervention and preventing damage to both lenses and drum surface.
Solution Approach 2:
The system performs preliminary action by automatically retracting the optical print head before maintenance operations begin. The control unit detects maintenance mode and proactively moves the print head to the retracted position, preventing potential damage before it can occur during drum replacement or cleaning operations.
2Ease of operation
If the cable is allowed to flex freely during print head movement, then the ease of operation is improved, but the cable may contact apparatus edges causing damage
Solution Approach 1:
A cable guide member acts as an intermediary between the flexible cable and the apparatus structure. This guide member provides a designated pathway for the cable to follow during print head movement, allowing the cable to flex freely without contacting dangerous edges. The guide member protects the cable from damage while maintaining the flexibility needed for smooth operation.
3Ease of repair
If the print head is manually retracted during maintenance, then the ease of repair is improved, but the complexity of the movement mechanism increases
Solution Approach 1:
The optical print head system performs self-service by automatically retracting itself during maintenance operations. The control unit monitors system state and autonomously moves the print head to the retracted position when maintenance is detected, eliminating the need for manual retraction operations and reducing overall system complexity.
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 effectively prevents damage to the optical print head and photosensitive drum during maintenance by ensuring safe retraction and reduces the risk of cable contact with the apparatus's edges, facilitating efficient maintenance operations.
Implementation Method 1
an optical print head having multiple light emitting elements for exposing a photosensitive drum. Some optical print heads use light-emitting diodes (LEDs)... as examples of light emitting elements
Implementation Method 2
The optical print head also has multiple lenses for condensing light emitted from the multiple light emitting elements on the photosensitive drum
Data Source
AI summary
An image forming apparatus includes a photosensitive drum to rotate as to an apparatus main body, a print head having a connector and a light emitting element, a movement mechanism to move the print head between an exposing position and a retracted position, a support part rotatable and to support the movement mechanism, a cable, and an abutting portion. The cable supplies drive signals for driving the light emitting element to the print head. The cable extends toward an opposite side of the connector and is bent toward one direction or another direction of the support part. The abutting portion is provided to the support part, and abuts the cable bent portion in a direction from the retracted position toward the exposing position to cause the cable to flex between a connected portion to the connector and the bent portion, when the print head is at the retracted position.