Sheet Feeding Unit Rail Geometry to Prevent Roller Drop-Off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses face challenges in smoothly pulling out and refilling sheet storing units due to limited design, which restricts easy access and maintenance, leading to difficulties in replacing components like photoconductor drums and belts.
Innovation Solution
The design incorporates a rotating member with an inclined counter surface that guides and supports the sheet storing unit when pulled out, using rails with specific geometries to prevent excessive movement and facilitate easy refilling, and includes projecting portions to regulate the movement and prevent dropping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sheet storing unit is designed to be pullable out for easy access and maintenance, then ease of operation is improved, but the risk of the rotating member dropping off increases
Solution Approach 1:
The patent applies preliminary anti-action by designing the counter surface with an inclination that prevents the rotating member from dropping off before it actually can. The inclined surface creates a geometric constraint that opposes the potential harmful motion (dropping off) in advance, allowing the sheet storing unit to be pulled out for maintenance while ensuring the rotating member remains securely positioned.
2Ease of operation
If the rotating member is designed to rotate freely for smooth operation, then ease of operation is improved, but control over the rotating member's position deteriorates
Solution Approach 1:
The patent applies local quality by creating different surface characteristics in different locations. The counter surface has a specific inclination angle in the direction opposite to pulling out, while having different characteristics in other directions. This localized geometric feature allows free rotation in the desired direction while providing positional control and preventing unintended movement.
Data Source
AI summary
An image forming apparatus includes a recording-medium storing unit including a rotating member, the recording-medium storing unit being capable of being pulled out from an apparatus body; a support surface having an edge portion, the support surface supporting the rotating member when the recording-medium storing unit is pulled out from the apparatus body; and an image forming unit that forms an image on a recording medium fed from the recording-medium storing unit. The rotating member has a counter surface that faces the edge portion when the rotating member moves beyond the edge portion and drops off the support surface in a certain direction. In the state in which the counter surface faces the edge portion, the counter surface is inclined such that a point on the counter surface approaches the edge-portion side as the point moves in a direction opposite to the certain direction.