Rotatable Guide Unit for Image Forming Apparatus Jam Removal
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Solution Overview
Problem
Image forming apparatuses face issues with printing jam due to the alignment and insertion of printing media between rollers, which can lead to jamming and difficulty in removing jammed media.
Innovation Solution
A guide unit that rotates about a first rotation shaft to form or open a guide path, allowing for the alignment and insertion of printing media between rollers, and includes a nip forming member that can be separated to release the nip and facilitate easy removal of jammed media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed guide path is used for aligning and inserting printing media between rollers, then the alignment precision is improved, but the difficulty of removing jammed media increases
Solution Approach 1:
The guide unit is designed to be rotatable about a rotation shaft, transforming it from a fixed structure to a dynamic one. When printing media is jammed, the guide unit can be rotated to change the position of the nip (the contact point between rollers), thereby facilitating easy removal of the jammed media. This dynamic adjustment resolves the contradiction by maintaining precise alignment during normal operation while enabling easy jam removal when needed.
2Ease of operation
If a rotatable guide unit is used to facilitate removal of jammed media, then the ease of operation is improved, but the alignment precision may deteriorate
Solution Approach 1:
The guide unit rotates about a fixed rotation shaft, allowing dynamic adjustment of the nip position for jam removal while maintaining precise alignment during normal printing operations. The rotational movement is controlled and reversible, ensuring that alignment precision is restored after jam removal.
Solution Approach 2:
The guide unit is separated from the fixed structure and designed as an independent rotatable component. This segmentation allows the guide unit to perform its dual function: maintaining precise alignment when in the normal position and facilitating jam removal when rotated, thereby resolving the contradiction between precision and ease of operation.
3Ease of operation
If the nip forming member is made separable, then the ease of removing jammed media is improved, but the device complexity increases
Solution Approach 1:
The nip forming member is designed as a separable component that can be detached from the guide unit. This segmentation enables easy removal of jammed media by separating the nip forming member from the roller assembly, while the modular design minimizes the increase in device complexity through straightforward assembly and disconnection mechanisms.
Data Source
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AI summary
An image forming apparatus is provided. The image forming apparatus includes a paper-feed unit, a developing unit to form an image in a printing medium, an insertion unit including first and second rollers configured to insert the printing medium conveyed from the paper-feed unit into the developing unit, and a guide unit rotatably disposed about a rotation shaft of the first roller and configured to guide the printing medium moving from the paper-feed unit to the insertion unit and selectively press the first roller to the second roller.