Movable Reference Guide for Sheet Positioning
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Solution Overview
Problem
Conventional sheet re-conveying apparatuses face challenges in maintaining high precision for sheet positioning in the width direction, particularly when handling sheets of different sizes, due to issues like positional deviation and increased conveying force leading to sheet deflection and reference surface scratching.
Innovation Solution
A sheet conveying apparatus with a moving mechanism using a cam and driving source to adjust the reference guide in the width direction, allowing precise alignment of sheets of varying sizes by altering the oblique feeding roller pair's position, thereby reducing the need for excessive conveying force and minimizing reference surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conveying force is increased to prevent sheet positional deviation, then the sheet positioning precision is improved, but the sheet may deflect or the reference surface may be scratched
Solution Approach 1:
The reference guide is made movable in the sheet width direction rather than fixed, allowing it to dynamically adjust its position to match different sheet sizes. This dynamic adjustment eliminates the need to increase conveying force, as the reference guide automatically aligns with each sheet's edge, preventing both sheet deflection and reference surface scratching while maintaining positioning precision.
Solution Approach 2:
The position parameter of the reference guide is changed according to sheet size. By adjusting the reference guide's position in the width direction to match different sheet dimensions, the system maintains optimal positioning precision without requiring excessive conveying force, thereby avoiding harmful effects on the sheet and reference surface.
2Device complexity
If a fixed reference guide is used for lateral registration correction, then the positioning mechanism is simple, but it cannot accommodate sheets of different sizes accurately
Solution Approach 1:
The reference guide is designed to be movable in the sheet width direction, transforming it from a static to a dynamic component. This allows the reference guide to adapt to different sheet sizes by adjusting its position, significantly improving versatility while adding only minimal complexity through a simple driving mechanism.
Solution Approach 2:
The movable reference guide serves multiple functions: it provides lateral registration correction for sheets of various sizes, accommodates different sheet dimensions, and maintains positioning accuracy across all sheet types. This single movable component replaces what would otherwise require multiple fixed reference guides for different sheet sizes.
3Measurement precision
If the reference guide position is adjusted for each sheet size, then the positioning precision for different sheet sizes is improved, but the device complexity increases
Solution Approach 1:
The reference guide is made dynamically adjustable in the sheet width direction through a simple driving mechanism. This dynamic design enables precise positioning for different sheet sizes without requiring complex multi-component adjustment systems, as the entire reference guide moves as a single unit to match sheet dimensions.
Solution Approach 2:
The driving mechanism for the reference guide is integrated with the existing sheet conveying system, combining the positioning function with the conveying mechanism. This merging approach achieves precise positioning for different sheet sizes while minimizing additional device complexity by sharing existing mechanical components.
Data Source
AI summary
An oblique feeding roller and a reference guide are provided on a re-conveying path for conveying a sheet in which an image has been formed on one side by an image forming unit to the image forming unit again. The sheet is obliquely fed by the oblique feeding roller. A side edge of the sheet abuts to a reference surface provided for the reference guide along a sheet conveying direction, thereby correcting the oblique motion and a positional deviation of the sheet. The reference guide is moved to a position according to a length in a width direction of the sheet which is conveyed by a movement of a cam.