Sheet Conveying Device Frame Deformation Counterweight
Solution Overview
Problem
The existing sheet conveying devices face issues with reduced nipping force in the axial center region of rollers, leading to slippage and conveying problems, as the frame used to absorb reaction forces can deform over time, reducing the ability to maintain the required nipping force.
Innovation Solution
A sheet conveying device is designed with a first and second roller, a third roller, a conveying member, a frame, a first pressing member, and a force-generating unit. The first pressing member applies a pressing force to the axial center of the first roller, generating a reaction force that is absorbed by the frame, while the force-generating unit applies an urging force to the frame away from the conveying member, offsetting the reaction force and maintaining the nipping force between the rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pressing member applies pressing force to the axial center region of a roller to increase nipping force, then the nipping force is improved, but the frame deforms due to the reaction force
Solution Approach 1:
The patent introduces a counter pressing member that applies a counter pressing force to the frame in opposition to the reaction force generated by the pressing member. This counter force compensates for the frame deformation, allowing the pressing member to maintain high nipping force without causing excessive frame distortion.
Solution Approach 2:
The patent applies pressing force locally at the axial center region of the roller where nipping force is needed, while simultaneously applying counter pressing force locally at the frame to counteract deformation. This localized application of forces allows the system to maintain both high nipping force and frame stability.
2Force
If the frame absorbs the reaction force from the pressing member, then the pressing force can be applied, but the frame deforms over time reducing nipping force
Solution Approach 1:
The counter pressing member continuously applies a counter pressing force to the frame to offset the reaction force from the pressing member. This prevents cumulative frame deformation over time, ensuring that the nipping force remains consistent and reliable during extended operation.
Solution Approach 2:
The system creates a feedback loop where the reaction force from pressing the roller is automatically counteracted by the counter pressing member acting on the frame. This continuous compensation mechanism ensures stable and consistent nipping force throughout the device's operational life.
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
This configuration effectively prevents deformation of the frame and maintains a consistent nipping force, ensuring stable sheet conveyance by offsetting the reaction force with the nipping force, thus preventing a decrease in the nipping force at the axial center region of the rollers.
Implementation Method 1
a force generated as a reaction to the pressing force (hereinafter referred to as 'the reaction force')
Implementation Method 2
a nipping force for nipping the sheet between the third roller and the conveying member
Implementation Method 3
one end of the spring is connected to the frame... the spring is resilient in a direction away from the conveying member
Data Source
AI summary
A sheet conveying device includes: first, second and third rollers, a conveying member, a frame, a first pressing member, and a force-generating unit. The first and second rollers rotate while nipping the sheet therebetween. The third roller and the conveying member nip the sheet therebetween. The frame is elongated parallel to an axis about which the third roller rotates and supports the third roller. The first pressing member applies a first pressing force to an axial center of the first roller to press the first roller toward the second roller and applies a reaction force of the first pressing force to the frame to press the frame in a direction toward the conveying member. The force-generating unit generates a nipping force for nipping the sheet between the third roller and the conveying member and applies an urging force to the frame in a direction away from the conveying member.