Guide Roll Step Structure to Suppress Sheet Tab Raising
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Solution Overview
Problem
Existing sheet transportation devices face issues with tabs being raised during transportation, particularly when handling sheets with protruding tabs, complicating the device structure with additional mechanisms like blow mechanisms.
Innovation Solution
The device employs guide rolls with a cylindrical roll main body and a short-diameter portion connected via a stepped portion, positioning the roll main body closer to the center than the tab end, and incorporating a meandering correction device to maintain sheet alignment, thereby suppressing tab raising without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blow mechanism is added to suppress tab raise, then tab stability is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary structure (the protruding portion on the guide roll) that mediates between the sheet and the tab. This protruding portion acts as a mechanical mediator that applies localized support force to the tab region, preventing tab raise without requiring complex blow mechanisms or additional active control systems.
Solution Approach 2:
The guide roll's protruding portion is designed to automatically provide support to the tabs during the winding process. The structure self-adjusts to the tab position and provides the necessary mechanical support without requiring external control systems, sensors, or additional energy input, thereby simplifying the overall device structure.
2Productivity
If the sheet is wound tightly along the guide roll, then transportation efficiency is improved, but tab deformation increases
Solution Approach 1:
The guide roll features a localized protruding portion that provides differential support: the main body of the sheet is wound tightly along the roll for efficient transportation, while the protruding portion specifically supports the tab region to prevent deformation. This local quality modification allows simultaneous achievement of tight winding and tab protection.
Solution Approach 2:
The guide roll is segmented into two functional zones: the main cylindrical body for general sheet winding and the protruding portion for specific tab support. This segmentation allows each zone to perform its specialized function independently, maintaining transportation efficiency while protecting tab integrity.
Data Source
AI summary
A sheet transportation device includes a guide roll along which a sheet is to be wound. The sheet includes a plurality of tabs provided intermittently in a longitudinal direction along at least one end in a width direction. The guide roll includes a cylindrical roll main body and a short-diameter portion connected with the roll main body so as to be outer, in the width direction of the sheet, to the roll main body. The roll main body is located closer to a center, in the width direction, of the sheet than a transportation path for the end. A portion of the sheet that is closer to the center than the end is wound along the roll main body. The short-diameter portion is connected with the roll main body via a stepped portion, and has an outer diameter shorter than an outer diameter of the roll main body.