Hinged Mould-and-Deckle Frame for Hand Paper-Making
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Solution Overview
Problem
The existing Japanese-style hinged mould-and-deckle frames for hand paper-making are limited in size options and lack features that could enhance productivity, leading to inefficiencies in positioning the screen, maintaining its tautness, and casting off excess pulp-water, resulting in increased time and physical effort.
Innovation Solution
The improved hinged mould-and-deckle frame features grooves in the rails for easy screen positioning, a guide bar system for secure screen handling, finger-hole openings for tautness adjustment, slat struts for support, beveled edges for efficient pulp-water removal, and catch latches for secure closure, all designed to reduce unnecessary movements and effort during the paper-forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional Japanese-style hinged mould-and-deckle frames are used, then the tool maintains simplicity and traditional construction, but the screen positioning is difficult and time-consuming
Solution Approach 1:
Guide bars are introduced as intermediary elements that mediate between the screen and the frame rails. These guide bars engage with grooves in the rails to automatically position and align the screen during insertion, eliminating the need for manual alignment and positioning adjustments by the operator.
Solution Approach 2:
The screen positioning system is designed to be self-aligning through the interaction of guide bars with grooved rails. When the screen is inserted into the frame, the guide bars automatically engage with the grooves to position the screen correctly without requiring additional manual intervention or adjustment steps.
2Ease of operation
If traditional hinged frames without support structures are used, then the construction remains simple, but the screen cannot maintain tautness during operation
Solution Approach 1:
The frame structure is segmented by introducing adjustable struts that divide the internal space into supported zones. These struts can be independently positioned and adjusted to provide localized support to the screen at multiple points, maintaining tautness without requiring a completely different frame design.
Solution Approach 2:
The struts are designed to be adjustable and repositionable, allowing the operator to dynamically adapt the support structure to different screen sizes and tension requirements. This dynamic adjustability enables the frame to accommodate various operational needs while maintaining a relatively simple overall structure.
3Ease of operation
If traditional frames without efficient drainage features are used, then the construction remains simple, but excessive pulp-water removal requires increased physical effort
Solution Approach 1:
The deckle frame is given different local qualities through beveled edges at specific locations where water drainage occurs. These beveled surfaces are strategically positioned to facilitate water flow and drainage, creating localized zones of improved fluid dynamics without altering the entire frame structure.
4Reliability
If traditional frames without secure closure mechanisms are used, then the construction remains simple, but the frame sections cannot be securely held together during operation
Solution Approach 1:
The closure mechanism is extracted from the main frame body and implemented as separate, removable latches. These latches can be engaged and disengaged independently from the frame structure, providing secure closure when needed while maintaining the simplicity of the basic frame design. The latches take out the securing function without permanently complicating the frame construction.
Data Source
AI summary
A hinged double-frame mould-and-deckle tool for making paper by hand (a keta in Japanese), comprising two equal-size frame sections, mould below and deckle above, which hold between them a flexible bamboo screen (called a su) on which a fiber web is formed, provided with seating grooves, mortised guide bar, finger openings at either end of the front channel, catch latches positioned for optimal seating of the screen and locking of the frame, removable struts, and beveled deckle. For purposes of this application and its claims, a screen or su is not part of the present invention.