Sheet Conveying Apparatus Metal Plate Creep Prevention
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Solution Overview
Problem
The existing sheet conveyer systems experience creep deformation over time due to reaction forces from urging coil springs, leading to a decrease in the nipping force between rollers and a reduction in the sheet-discharging ability.
Innovation Solution
A sheet conveying apparatus is designed with a metal plate member that extends orthogonally to the conveying direction, contacting the driver frame and supporting the urging member, which helps maintain the urging force within a preferable range and prevents creep deformation, thereby enhancing the discharging ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the urging coil spring is used to maintain the nipping force between rollers, then the sheet discharging ability is improved, but creep deformation occurs in the casing over time causing the nipping force to decrease
Solution Approach 1:
A plate member is introduced as an intermediary component between the urging coil spring and the casing. The plate member absorbs and distributes the reaction force from the urging coil spring, preventing direct transmission to the casing and thereby preventing creep deformation while maintaining the nipping force.
Solution Approach 2:
The plate member is pre-installed in position to provide a stable mounting surface for the urging coil spring. This preliminary structural preparation prevents future deformation by establishing a rigid force distribution path before the spring begins its continuous urging action.
2Device complexity
If the urging coil spring is placed directly in the spring holder, then the device complexity is reduced, but the compressed length of the spring increases beyond the preferable range over time
Solution Approach 1:
The plate member serves as an intermediary between the spring holder and the urging coil spring, providing a stable, rigid support surface that prevents excessive compression. This intermediary structure maintains the spring compressed length within the preferable range while adding minimal complexity to the overall device.
3Volume of moving object
If the casing is made thinner to reduce size, then the device compactness is improved, but the creep deformation occurs more easily under the reaction force
Solution Approach 1:
The plate member acts as a force-distributing intermediary that allows the use of thinner, more compact casing materials. By distributing the reaction force across the plate member's surface area, the local stress on the casing is reduced, preventing creep deformation even in thinner casings.
Solution Approach 2:
The introduction of the plate member changes the stress distribution parameters in the casing. Instead of concentrated point loads from the spring, the force is distributed over a larger area, allowing the casing to be made thinner while maintaining sufficient strength and resistance to creep.
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 maintains the nipping force between rollers over a longer period, ensuring consistent sheet discharging and improving the overall conveying efficiency.
Implementation Method 1
an urging member configured to urge the pinch roller against the driving roller
Implementation Method 2
The reaction force affecting the bottom face of the spring holder over a long period of time may cause creep deformation in the casing
Data Source
AI summary
A sheet conveying apparatus, including a conveyer to convey a sheet in a predetermined conveying direction along a predetermined conveyer path, and a discharger forming a part of the conveyer to discharge the sheet from the conveyer path, is provided. The discharger includes a driving roller, a pinch roller arranged to confront the driving roller across the conveyer path, and an urging member to urge the pinch roller against the driving roller. The conveyer includes a chute member. The chute member includes a guiding face defining a part of the conveyer path, a supporting face to support one end of the urging member, and a contact face located on a particular face of the chute member opposite from the supporting face. The sheet conveying apparatus includes a plate member made of metal arranged to extend in a direction intersecting with the conveying direction and to contact the contact face.