LED Head Positioning Mechanism for Image Forming Apparatus
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Solution Overview
Problem
Conventional image forming apparatuses fail to accurately position the LED head with respect to the photosensitive drum in both the light axis and rotational directions due to the lack of contact between the fitting projection and the positioning hole.
Innovation Solution
An image forming apparatus is designed with a positioning member that contacts the exposing member, allowing it to be pressed by a pressing member for accurate positioning in the rotational direction, and a spacing member maintains distance for accurate alignment in the light axis direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fitting projection and positioning hole structure is used to position the LED head, then the LED head can be positioned in the rotational direction of the photosensitive drum, but accurate positioning in the light axis direction cannot be achieved
Solution Approach 1:
The positioning function is divided into two independent segments: the positioning member handles rotational direction positioning through contact with the exposing member, while the spacing member handles light axis direction positioning through maintaining a fixed distance. This segmentation allows each component to specialize in one positioning dimension, achieving accurate two-dimensional positioning without requiring a complex integrated positioning structure.
2Reliability
If the fitting projection is pressed into the positioning hole, then the LED head is constrained in position, but the exposing member cannot make contact with both the photoreceptor and positioning member simultaneously
Solution Approach 1:
The spacing member acts as an intermediary element between the exposing member and the photoreceptor. It maintains a predetermined distance and enables the exposing member to simultaneously contact both the positioning member (for rotational positioning) and the photoreceptor (for light axis positioning). This intermediary structure ensures reliable dual-directional positioning while simplifying the assembly process.
Data Source
AI summary
An image forming apparatus includes a photoreceptor which is rotatable with respect to a body frame, an exposing member which is movable relative to the body frame, a spacing member which is provided between the exposing member and the photoreceptor to maintain a distance between the photoreceptor and the exposing member, a positioning member which makes a contact with the exposing member to position the exposing member in a direction of rotation of the photoreceptor, and a pressing member which is provided to the body frame to press the exposing member toward the photoreceptor and the positioning member. Accordingly, it is possible to position the exposing member accurately with respect to the photoreceptor, in any of the light-axis direction and the rotational direction of the photoreceptor.