Sheet Discharge Device Stiffening Roller Guide
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Solution Overview
Problem
Conventional sheet discharge devices experience issues with folding or jamming of thick sheets due to thermal deformation, which causes the sheet to skew and curve, leading to poor stacking properties and edge damage.
Innovation Solution
A sheet discharge device with a conveying portion featuring a first and second roller, upstream conveying guides, a rotating stiffening roller with a larger diameter, and a guide portion where the interval between the guides narrows downstream, ensuring a consistent entry angle and preventing sheet folding or jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stiffening roller with a larger diameter than the driving roller is provided to stiffen the sheet and improve stacking properties, then the sheet can be discharged in a stiffened state, but the entry angle of the sheet to the stiffening roller becomes worse, causing folding or jamming of the sheet edge
Solution Approach 1:
The patent applies preliminary action by introducing a guide portion before the stiffening roller that gradually narrows the interval between conveying guides. This pre-positioning action adjusts the sheet's trajectory in advance, ensuring the sheet enters the stiffening roller at an appropriate angle and preventing folding or jamming before it reaches the problematic entry angle
Solution Approach 2:
The guide portion acts as an intermediary element between the conveying guides and the stiffening roller. It mediates the transition by gradually narrowing the interval, creating a smooth progression that guides the sheet into the stiffening roller without sudden angular changes that would cause folding or jamming
2Device complexity
If the interval between conveying guides is maintained uniformly, then the structure is simple, but the sheet entry angle to the stiffening roller deteriorates, causing folding or jamming
Solution Approach 1:
The patent applies local quality by making the interval between conveying guides non-uniform. Specifically, the guide portion has a narrower interval located at a position corresponding to the rotating portion in the sheet width direction, while other regions maintain larger intervals. This localized variation in geometry optimizes the sheet entry angle at the critical location without unnecessarily complicating the entire guide structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents sheet folding and jamming by maintaining a consistent entry angle for the sheet, reducing conveyance resistance and improving stacking properties.
Implementation Method 1
a conveying portion which includes a first roller contacting a first surface of a sheet and a second roller contacting a second surface of the sheet and which conveys the sheet in a conveying direction with the sheet interposed between the first roller and the second roller
Implementation Method 2
the sheet discharge device rounds or skews on the sheet discharge tray due to thermal deformation after fixing
Data Source
AI summary
A sheet discharge device includes: a conveying portion which conveys the sheet in a conveying direction with the sheet interposed between a first roller and a second roller; a first conveying guide; a second conveying guide; a rotating portion which is disposed on a shaft of the first roller and has an outer diameter larger than that of the first roller; and a guide portion which is provided in the first conveying guide and in which an interval between the guide portion and the opposite second conveying guide becomes narrower toward a downstream side in the conveying direction, the guide portion being located at a position corresponding to the rotating portion in a sheet width direction orthogonal to the conveying direction.