Pinch Roller Guide Member Sheet Curl Correction
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Solution Overview
Problem
Conventional sheet discharging devices with sheet-curl correcting functions often experience issues with the trailing end of sheets leaping and colliding with components, causing noise and disrupting sheet conveyance, especially with sheets having strong linearity or tensility like thick sheets or cardboard.
Innovation Solution
A sheet discharging device incorporating a housing, a drive roller, a first pinch roller, a second pinch roller, a holder, an urging member, and a guide member, where the first pinch roller moves between contact and separated positions to manage sheet curling, and the guide member is positioned to guide the sheet smoothly, reducing the likelihood of collisions and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the two lower rollers are held fixed in position to correct sheet curling, then sheet curl correction is effective, but the trailing end portion of the sheet may leap and collide with the holder or components causing noise and disturbing sheet conveyance
Solution Approach 1:
The holder is made movable relative to the fixed holder in conventional structures. The holder can move in the sheet conveying direction to adjust the position of lower rollers, allowing dynamic adaptation to different sheet types and curling conditions while preventing trailing end collision with the holder or components
Solution Approach 2:
The position parameters of the lower rollers are made adjustable through the movable holder mechanism. This allows optimization of roller positioning for different sheet characteristics (thickness, tensility, linearity) to balance curl correction effectiveness with prevention of trailing end leap and collision
2Manufacturing precision
If the lower rollers are positioned close to the upper roller to correct sheet curling, then curl correction is improved, but the trailing end portion of the sheet is more likely to collide with the holder or nearby components
Solution Approach 1:
The holder's movable design allows dynamic adjustment of lower roller positioning. The holder can move to optimize the gap between rollers and upper roller for precise curl correction, while simultaneously positioning components to prevent trailing end collision, thus resolving the spatial conflict between correction precision and collision prevention
3Device complexity
If a fixed holder structure is used for simplicity, then device complexity is reduced, but the device cannot adapt to different sheet types with varying linearity and tensility
Solution Approach 1:
The holder is designed with movable capability while maintaining relatively simple construction. This dynamic design enables adaptation to different sheet types (thin sheets, thick sheets, pasteboard) with varying linearity and tensility by adjusting holder position, thus achieving versatility without excessive complexity
Solution Approach 2:
The movable holder structure serves multiple functions: it adjusts lower roller positioning for optimal curl correction, prevents trailing end collision with holder or components, and adapts to different sheet characteristics. This multi-functionality achieves versatility while keeping the overall device relatively simple
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 reduces the leaping of sheet trailing ends, minimizing noise and ensuring stable sheet conveyance by adjusting the position of the first pinch roller and utilizing the guide member to guide the sheet, thus improving the sheet discharging process.
Implementation Method 1
an urging member configured to urge the first pinch roller toward the drive roller
Implementation Method 2
The first pinch roller is disposed to face the drive roller and is configured to contact the drive roller for rotation. The second pinch roller is disposed downstream relative to the first pinch roller in the discharging direction. The second pinch roller is configured to face the drive roller and contact the drive roller for rotation.
Data Source
AI summary
A sheet discharging device includes a housing, a drive roller, a first pinch roller, a second pinch roller, a holder, a guide member, and an urging member urging the first pinch roller toward the drive roller. The second pinch roller is positioned downstream of the first pinch roller in a discharging direction. The holder has a connecting portion supporting the first and second pinch rollers. The first pinch roller is movable between a contact position in contact with the drive roller and a separated position separated from the drive roller. Between the first and second pinch rollers in the discharging direction, the guide member is farther away from the drive roller than the connecting portion is when the first pinch roller is at the contact position, and is closer to the drive roller than the connecting portion is when the first pinch roller is at the separated position.