Image Forming Roller Displacement Mechanism for Stable Sheet Conveyance
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Solution Overview
Problem
Existing image forming apparatuses struggle to reliably remove bending tendencies from various types of recording sheets due to inconsistent facial pressure between rollers, leading to potential damage or unstable conveyance.
Innovation Solution
The apparatus incorporates a roller displacing mechanism with a cam plate and guide units to maintain constant facial pressure between the conveying roller and follower rollers, ensuring stable conveyance by adjusting the distance between the rollers and guiding the recording sheet to prevent collisions and maintain consistent curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the support plate is moved in parallel with the conveying direction to switch contact cases of follower rollers, then various kinds of recording sheets can be dealt with, but the distance between the rotation center of the other follower roller and the rotation center of the conveying roller varies, causing the contacting facial pressure to change and the recording sheet cannot be stably conveyed
Solution Approach 1:
The patent applies the dynamics principle by making the support plate movable in the conveying direction, allowing it to dynamically adjust its position. This enables the system to adapt to different recording sheet types while maintaining stable conveyance through controlled movement of the support plate and follower rollers.
Solution Approach 2:
The patent changes the parameter of the support plate position along the conveying direction to optimize the distance between roller rotation centers. By adjusting this parameter, the system maintains consistent contacting facial pressure while handling various recording sheet types, resolving the contradiction between versatility and stable conveyance.
2Adaptability or versatility
If the follower roller on the upstream side is switchably moved to be brought into and out of contact with the recording sheet, then various kinds of recording sheets can be dealt with, but the recording sheet cannot be stably conveyed due to varying distance between follower roller and conveying roller
Solution Approach 1:
The patent makes the support plate and follower rollers dynamically movable, allowing them to adjust their positions according to the recording sheet type. This dynamic adjustment maintains the optimal distance between roller rotation centers, ensuring stable conveyance while handling various sheet types.
Solution Approach 2:
The patent changes the positional parameter of the support plate and follower rollers to maintain consistent geometry between roller rotation centers. This parameter adjustment ensures that the distance remains optimal for stable conveyance while adapting to different recording sheet characteristics.
3Object-affected harmful factors
If the contacting facial pressure becomes excessively high, a roller scar may be formed to damage the recording sheets, but if the contacting facial pressure becomes excessively low, the recording sheet cannot be sufficiently clamped so that it cannot be stably conveyed
Solution Approach 1:
The patent changes the geometric parameter of the distance between roller rotation centers to optimize contacting facial pressure. By adjusting this parameter, the system achieves the optimal pressure level that provides sufficient clamping for stable conveyance while preventing excessive pressure that would cause roller scars and sheet damage.
Data Source
AI summary
An image forming apparatus includes an image forming unit which forms an image on a recording sheet, a casing which houses the image forming unit and holds the image forming units, a conveying roller which applies a conveying force to the recording sheet by contacting with the recording sheet, a first roller which is fixed to a position confronting the conveying roller, the first roller pushing the recording sheet toward the conveying roller and being rotatable, a second roller which is arranged at a position confront the conveying roller and downstream side of the first roller in a conveying direction, the second roller being displaceable, and a roller displacing mechanism which displaces the second roller in such a manner as to change a distance between the second roller and the conveying roller.