Image Forming Device Positioning Mechanism for LED Head Alignment
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Solution Overview
Problem
Conventional image forming devices face positioning accuracy issues due to errors between the device body, process cartridge, and LED head, leading to shifts in the printing position.
Innovation Solution
An image forming device with a fixed exposing unit and a process cartridge that includes positioning projections and guide grooves to ensure precise alignment of the LED head and photosensitive drum, reducing the need for complex positioning mechanisms and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the LED head is positioned with respect to the process cartridge using conventional methods, then the device structure is simpler, but the positioning accuracy of the LED head with respect to the device body deteriorates
Solution Approach 1:
The patent introduces a positioning mechanism that serves as an intermediary between the process cartridge and the LED head. This positioning mechanism includes positioning protrusions and positioning grooves that mediate the relative positioning, ensuring high positioning accuracy while maintaining structural simplicity. The intermediary positioning structure transfers and refines the positional relationship between components.
2Measurement precision
If complex positioning mechanisms are used to improve positioning accuracy, then the positioning accuracy increases, but the device complexity increases
Solution Approach 1:
The positioning function is segmented into multiple independent elements: positioning protrusions on the process cartridge, corresponding positioning grooves on the LED head, and guide rails for the arm mechanism. This segmentation allows each element to perform a specific positioning function, achieving high overall positioning accuracy while keeping each individual component simple and the overall structure modular.
3Ease of operation
If the LED head position is determined relative to the process cartridge, then the attachment is easier, but printing position shifts occur due to accumulated positioning errors
Solution Approach 1:
The patent implements a feedback mechanism where the positioning protrusions and grooves provide real-time positional feedback during the attachment process. As the process cartridge is attached, the positioning elements automatically adjust and confirm the correct position, preventing accumulated positioning errors from affecting the final printing position. This feedback ensures both ease of attachment and high printing position accuracy.
Data Source
AI summary
An image forming includes a main body, an exposing unit, a process cartridge, and a positioning unit. The exposing unit is fixed to the main body and includes an exposing member. The process cartridge is attachable to an attaching portion provided on at least one of the main body and the exposing unit, and includes a photosensitive drum. The positioning unit positions the process cartridge with respect to the exposing unit so that the photosensitive drum faces the exposing member in a first direction when the process cartridge is attached to the attaching portion, allowing the photosensitive drum to be exposed by the exposing member.