Lined Curtain Hem Formation Using Differential Sheet Cutting

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Solution Overview

Problem

Manual methods for manufacturing lined curtains result in time-consuming, laborious, and inefficient hem formation with insufficient quality due to inaccurate cutting of the lining, leading to inconsistent hem quality.

Innovation Solution

Mechanically cutting the first and second flexible sheets to different lengths, allowing precise control of the hem width, with the sheets suspended and movable, and tilting them to form the hem, ensuring consistent folding and adhesion for a strengthening strip.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If manual cutting methods are used to form hems, then flexibility in operation is maintained, but manufacturing precision and productivity deteriorate due to inaccurate cutting and time-consuming operations

Engineering Contradiction:

Improvehem width consistencyVSAvoidmanufacturing efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The process is segmented into distinct mechanical operations: first cutting the lining to a predetermined length, then cutting the curtain to a different length, and finally folding to form the hem. This segmentation allows each operation to be optimized independently, ensuring precise hem width control while maintaining efficient production flow.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Manual cutting operations are replaced with mechanical cutting means that can accurately cut both the curtain and lining to predetermined lengths. This substitution eliminates the imprecision of manual cutting while maintaining high productivity through automated or semi-automated mechanical processes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If manual cutting is performed to form hems, then operational flexibility is preserved, but manufacturing precision deteriorates due to insufficient cutting accuracy

Engineering Contradiction:

Improvecutting accuracyVSAvoidtime for hem formation

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The lining is cut to a predetermined length before the curtain is cut and before the folding operation. This preliminary cutting action ensures that when the curtain is subsequently folded over the lining, the hem width is precisely controlled by the predetermined length difference, eliminating the time and imprecision associated with manual measurement and cutting during the folding process.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the lining is cut manually before folding, then adaptability is maintained, but manufacturing precision and productivity worsen due to laborious operations and inconsistent quality

Engineering Contradiction:

Improvehem formation efficiencyVSAvoidhem quality consistency

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

Both the cutting of the lining and the cutting of the curtain are performed using mechanical cutting means rather than manual cutting tools. This mechanical substitution ensures consistent, accurate cuts that directly determine uniform hem widths across all productions, while the streamlined sequence of operations maintains high productivity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8556788B2Method for manufacturing an assembly of a first flexible sheet and a second flexible sheet by mechanical means

Publication Date: 2013.10.15 SECURO

AI summary

A method for manufacturing an assembly of a first flexible sheet and a second flexible sheet by mechanical means, wherein a longitudinal edge of the first flexible sheet is folded over for forming a hem therein, characterized in that said first flexible sheet and said second flexible sheet are mechanically cut to mutually different lengths, with the width of the hem being determined by the difference in length between the first flexible sheet and the second flexible sheet.