Optical Ribbon Encoder for Sewing Machine Stitch Regulation
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Solution Overview
Problem
Existing sewing machine systems for quilting struggle with accuracy in monitoring cloth movement and regulating stitching speed, leading to inconsistent stitch lengths when navigating complex patterns or seam lines, due to susceptibility to lint and debris.
Innovation Solution
The implementation of an optical encoder system that uses flexible textile ribbons and sensors to detect movement between the sewing machine and fabric, providing accurate movement data to a stitch regulation motor controller, which adjusts the sewing machine speed to maintain uniform stitch lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional encoders are used to monitor cloth movement, then the system can detect movement, but the encoder is susceptible to lint and debris which reduces measurement accuracy
Solution Approach 1:
The patent replaces traditional mechanical encoders with an optical encoder system that uses light to detect movement. The optical encoder includes a light source, photodetector, and scale that work together to measure displacement optically rather than mechanically, eliminating the problem of lint and debris affecting mechanical components.
Solution Approach 2:
The patent introduces an optical intermediary system consisting of a light source, optical path, and photodetector that mediates between the moving component and the measurement system. This optical intermediary is not affected by lint and debris in the same way mechanical components are, providing accurate movement detection despite the presence of contaminants.
2Manufacturing precision
If the sewing machine speed is adjusted to match varying fabric movement speeds, then uniform stitch lengths are achieved, but the system complexity increases
Solution Approach 1:
The patent implements a feedback control system where the optical encoder continuously monitors fabric movement and provides this information to a controller that adjusts the sewing machine needle position accordingly. This closed-loop feedback ensures uniform stitch lengths by constantly comparing actual stitch length with target stitch length and making real-time corrections.
Solution Approach 2:
The patent integrates multiple functions into a single coordinated system: the optical encoder serves both as a movement sensor and a control input, the controller performs both monitoring and adjustment functions, and the overall system handles both slow fabric movement (requiring needle pauses) and fast movement (requiring increased needle speed) within a unified control framework.
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
The optical encoder system effectively resists dust and debris, ensuring accurate and consistent stitch lengths across varying patterns, enhancing quilting precision and reliability.
Implementation Method 1
an optical encoder system that uses flexible textile ribbons and sensors to detect movement between the sewing machine and fabric
Data Source
AI summary
A sewing machine system includes an optical encoder which senses relative movement between the sewing machine and fabric and varies the stitching speed of the sewing machine to create stitches according to a user selected stitch length.