Sheet Conveyer Guide Mechanism for Wrinkle Prevention
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Solution Overview
Problem
Existing sheet conveyers face challenges in downsizing while preventing idle rotation of the pickup roller and wrinkling of sheets, due to issues with pressure distribution and space constraints, especially when handling varying sheet thicknesses and quantities.
Innovation Solution
A sheet conveyer design featuring a swingable holder with a guide and urging member that adjusts the gap between the pickup roller and sheet support, allowing for increased pressure on sheets and reduced idle rotation, while maintaining a compact size by minimizing the neighboring area's volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the holder is allowed to swing away from the sheet support section to accommodate varying sheet quantities and thicknesses, then the sheet conveyer can handle different sheet configurations, but a large space is required in the area opposite from the sheet support section, increasing the overall size of the sheet conveyer
Solution Approach 1:
The holder is designed to be swingable about an axis extending in parallel with the pickup roller's rotation axis, allowing dynamic adjustment of the gap between the pickup roller and sheet support section. This dynamic positioning enables the holder to adapt to varying sheet quantities and thicknesses while maintaining a compact overall structure, as the holder swings within a controlled range rather than requiring large reserved space.
2Reliability
If the weight of the pickup roller is increased to apply sufficient pressure to straighten curled sheets, then curled sheets can be properly fed, but the pressure may become excessive for smaller quantities of sheets, causing the sheets to be wrinkled
Solution Approach 1:
The pickup roller's pressure on the sheets is made dynamic through the swingable holder mechanism. As sheets are fed, the holder swings to adjust the gap, automatically modulating the pressure applied by the pickup roller. This dynamic pressure adjustment ensures sufficient force to straighten curled sheets while preventing excessive pressure that would cause wrinkling, adapting to the actual sheet quantity and thickness in real-time.
Solution Approach 2:
The system changes the physical parameter of pressure dynamically by varying the gap between the pickup roller and sheet support section. This parameter change is achieved through the swingable holder's movement, which adjusts the pickup roller's position relative to the sheets based on sheet quantity and thickness, thereby optimizing pressure application to prevent both insufficient straightening and excessive wrinkling.
3Adaptability or versatility
If the holder swings to move away from the sheet support section to accommodate thicker or larger quantities of sheets, then the pickup roller can contact the uppermost position of the sheets, but the pressure applied to the sheets by the pickup roller is reduced
Solution Approach 1:
The swingable holder creates a dynamic balance between gap adjustment and pressure maintenance. As the holder swings to accommodate thicker or larger quantities of sheets (increasing the gap), the mechanism is designed to maintain sufficient pickup roller pressure through the coordinated movement and urging member action, ensuring both adaptability to varying sheet configurations and consistent feeding force.
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 idle rotation and wrinkling of sheets, ensures proper feeding of curled sheets, and allows for a more compact design by optimizing the movement and pressure distribution of the pickup roller, thus enhancing the functionality and size efficiency of the sheet conveyer.
Implementation Method 1
an urging member arranged between the holder and the guide, the urging member being configured to apply urging force that acts on the guide to move toward the first position with respect to the holder
Implementation Method 2
the guide including a guide surface arranged on an upstream side of the holder in the conveying direction, the guide being configured guide a leading end of the sheet set on the sheet support to the gap between the pickup roller and the sheet support along the guide surface
Data Source
AI summary
A sheet conveyer including a sheet support, a pickup roller, a separator roller, a holder, a guide, an urging member, and a contact section is provided. The holder is swingable and supports the pickup roller rotatably. The guide is attached to the holder and movable to swing relatively to the holder along with a swing movement of the holder. Urging force from the urging member acts on the guide to move toward a first position with respect to the holder. The contact section contacts a contacting part in the guide to restrict, the contacting part from being moved along with the swing movement of the holder. The guide is movable relatively to the holder from a position closer to the first position toward a position closer to a second position against the urging force from the urging member and allows the holder to further move toward the uppermost position.