Sheet Conveyance Roller Guide Arch Bending
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Solution Overview
Problem
Existing sheet conveyance apparatuses face issues with wrinkles, floating, and uneven conveyance precision due to back tension caused by film pressing, which is affected by film wear and environmental changes, leading to reduced accuracy in high-precision applications.
Innovation Solution
A sheet conveyance apparatus with a conveyance roller pair having rollers with uniform diameters and an upstream guide unit that regulates sheet edges, bending the sheet into an arch shape to prevent wrinkles and floating, while maintaining high precision without the need for film pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film pressing mechanism is used to prevent sheet wrinkles and floating, then sheet conveyance stability is improved, but back tension causes the actual conveyance distance to be shorter than the ideal conveyance distance, reducing conveyance precision
Solution Approach 1:
The invention extracts and eliminates the film pressing mechanism from the conveyance system. Instead of using a film to press the sheet, the patent employs a roller pair that directly conveys the sheet through friction, removing the source of back tension and its associated precision errors while maintaining sheet stability through the roller's gripping action
Solution Approach 2:
The invention replaces the mechanical film pressing system with a roller-based friction conveyance system. The film pressing mechanism is substituted by rollers that convey the sheet through controlled friction, eliminating the back tension problem while achieving sheet conveyance through a different mechanical principle
2Reliability
If a film pressing mechanism is used to maintain sheet flatness, then wrinkle prevention is improved, but film wear and environmental changes cause uneven back tension, increasing unevenness in conveyance distance
Solution Approach 1:
The invention removes the film component entirely from the conveyance system, eliminating the wear and environmental sensitivity issues associated with film materials. The roller pair directly contacts and conveys the sheet without requiring a flexible film intermediary, ensuring consistent conveyance characteristics over time
Solution Approach 2:
The invention replaces the durable but environmentally sensitive film with a simpler, more stable roller mechanism that is less susceptible to environmental variations. The roller system provides more consistent mechanical properties compared to film that degrades with wear and humidity changes
3Productivity
If a film pressing mechanism is used to convey sheets, then sheet conveyance is achieved, but increased load on the fixed face of the film causes peeling or bending of the film
Solution Approach 1:
The invention extracts and eliminates the film component from the conveyance system, replacing it with a roller pair that directly conveys sheets through friction. This removes the film from the load-bearing path, eliminating peeling and bending issues while maintaining conveyance capability
Solution Approach 2:
The invention substitutes the film-based pressing mechanism with a roller-based friction conveyance system. The load that previously stressed the film's fixed face is now distributed through the roller contact, eliminating the structural integrity problems of the film while achieving the same conveyance function
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 suppresses sheet wrinkles and floating, ensuring high conveyance precision and stability, unaffected by changes in film durability or environmental conditions.
Implementation Method 1
the guide unit that is provided on an upstream side of the conveyance roller pair and that is configured to regulate a position of an edge of the sheet, wherein the conveyance roller pair conveys the sheet in a state in which the sheet is bended by the guide unit
Implementation Method 2
a conveyance roller pair that has a roller with a uniform diameter in a sheet width direction and that is configured to pinch and convey a sheet
Data Source
AI summary
A sheet conveyance apparatus includes a conveyance roller pair that has a roller with a uniform diameter in a sheet width direction and that is configured to pinch and convey a sheet, and a guide unit that is provided on an upstream side of the conveyance roller pair and that is configured to regulate a position of an edge of the sheet, wherein the conveyance roller pair conveys the sheet in a state in which the sheet is bended by the guide unit so that on a roller side with a uniform diameter in a sheet width direction, the sheet convexly bends.