Roll Sheet Support Apparatus with Retractable Engaging Member
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Solution Overview
Problem
Existing roll sheet supporting apparatuses for printing machines face challenges in securely attaching to core tubes without flange fixing auxiliary members, leading to potential damage and complexity in configuration, and difficulty in inserting the supporting apparatus due to size mismatches and impact issues during attachment.
Innovation Solution
A roll sheet supporting apparatus with a pair of rotation shafts and an engaging member that moves between a projecting and retracting position, allowing easy and secure attachment to the core tube without the need for a flange fixing auxiliary member, by protruding to engage with the core tube only when necessary, thus simplifying the mounting process and reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange fixing auxiliary member is provided on the core tube to enable detachable support of the supporting apparatus, then the reliability of attachment is improved, but the device complexity increases
Solution Approach 1:
The flange fixing auxiliary member is extracted from the core tube structure and integrated into the supporting apparatus itself. The engaging member is provided on the rotation shaft of the supporting apparatus, allowing it to engage with the core tube without requiring additional components on the core tube. This simplifies the core tube to a basic hollow cylinder while maintaining reliable attachment.
Solution Approach 2:
The supporting apparatus performs its own fixing function through the engaging member provided on its rotation shaft. The engaging member can project to engage with the core tube or retract to disengage, allowing the supporting apparatus to self-adjust and self-fix without requiring external fixing components on the core tube.
2Ease of operation
If the leading edge portion of the supporting apparatus presses the inner circumferential surface of the core tube for fixation, then the ease of operation is improved, but the reliability of attachment deteriorates due to potential damage and size mismatch
Solution Approach 1:
The engaging member is designed to be movable between a projecting position and a retracting position. During insertion, the engaging member retracts to avoid interference with the core tube inner diameter. After insertion, the engaging member projects to engage with the core tube for reliable fixation. This dynamic adjustment resolves the conflict between ease of insertion and reliable attachment.
Solution Approach 2:
The engaging member is preliminarily positioned in the retracted state before insertion to avoid size mismatch issues. After the supporting apparatus is inserted into the core tube, the engaging member is then moved to the projecting state to establish reliable engagement. This sequential action prevents damage during insertion while ensuring secure attachment afterward.
3Reliability
If the outer diameter of the leading edge portion is enlarged for pressing fixation, then the reliability of attachment is improved, but the ease of operation deteriorates due to difficulty in insertion
Solution Approach 1:
The engaging member's outer diameter is effectively variable through its movement between retracted and projecting positions. In the retracted position, the outer diameter is reduced to match the core tube inner diameter for easy insertion. In the projecting position, the engaging member extends to provide reliable engagement. This dynamic size adjustment resolves the contradiction between insertion ease and attachment reliability.
Data Source
AI summary
A roll sheet supporting apparatus includes a pair of rotation shafts which are respectively fitted into end portions of the hollow portion of the core tube and configured to support the roll sheet rotatably and capable of being drawn out, an engaging member movable between a projecting position and a retracting position, wherein the engaging member projects from an outer circumferential surface of the each rotation shaft abutting on the core tube to engage with the core tube at the projecting position and retracts inward from the outer circumferential surface of the each rotation shaft at the retracting position, and an engaging member moving unit configured to move the engaging member between the projecting position and the retracting position.