Sewing Machine Fabric-Motion Control With Projected Stitch Guidance
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Solution Overview
Problem
Existing sewing machines with movement detectors lack user convenience during sewing operations.
Innovation Solution
A sewing machine equipped with a movement detector that adjusts stitch lengths based on fabric movement, featuring a controller that controls the needle bar's up-down speed and projects an image onto the bed surface to enhance user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a movement detector is attached to the presser bar to detect fabric movement and control stitch length, then stitching precision is improved, but user convenience deteriorates due to lack of visual feedback
Solution Approach 1:
The projector displays visual information (guidelines, icons, text) on the bed surface to provide real-time feedback to the user about sewing state, fabric movement detection status, and operational parameters, enhancing user convenience without affecting stitch precision
Solution Approach 2:
The projector acts as an intermediary between the movement detector控制系统 and the user, translating internal detection data and control states into visible visual cues on the bed surface, allowing users to understand and interact with the automated stitching process
2Productivity
If the needle bar reciprocates at high speed to maintain productivity, then production efficiency is improved, but stitch length consistency deteriorates when fabric movement varies
Solution Approach 1:
The needle bar reciprocating speed is dynamically adjusted based on real-time fabric movement detection. When fabric movement is detected, the needle bar speed is reduced to maintain stitch consistency; when no movement is detected, the needle bar operates at high speed to maintain productivity
Solution Approach 2:
The movement detector provides real-time feedback on fabric movement, which the controller uses to adjust needle bar reciprocating speed dynamically, ensuring stitch length consistency while maintaining high productivity through adaptive speed control
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 solution ensures consistent stitch lengths and improves user convenience by providing visual guidance during sewing operations.
Implementation Method 1
a light receiving element for detecting light to detect the movement of the fabric
Implementation Method 2
controlling the projector to project an image toward the bed surface
Data Source
AI summary
A sewing machine includes a bed including a bed surface, a needle bar, a presser bar, a projector, and a controller. A movement detector is attachable to the presser bar. The controller is configured to perform a sewing control of, in a state where the movement detector is attached to the presser bar, controlling an up-down reciprocating speed of the needle bar based on a signal output from the movement detector. The signal corresponds to a movement amount of a sewing workpiece located in a detection region. The controller is configured to perform a projection of, during performing the sewing control, controlling the projector to project an image toward the bed surface.