Sewing Machine Cloth Movement Detection via Presser Bar Window
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Solution Overview
Problem
Existing cloth movement detection systems for sewing machines struggle to accurately detect cloth movement, especially when using hand-fed cloths, leading to inconsistent seam pitches due to incorrect needle operation speed adjustments.
Innovation Solution
A cloth movement detection device with a light detection portion and a body portion detachably attached to the sewing machine's presser bar, featuring a window portion for transmitting light and an infrared light irradiation system, which allows for precise detection of cloth movement by reducing interference from visible light and external factors, ensuring accurate seam pitch formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light detection portion is arranged near the sewing machine needle to detect cloth movement, then the detection sensitivity is improved, but the detectable range becomes narrower causing failure to detect movement in some cloths and patterns
Solution Approach 1:
The patent introduces a transparent window portion on the presser bar that allows light to pass through to the cloth, creating a new optical path dimension. This enables the light detection portion to detect cloth movement through the window rather than requiring direct contact or proximity, thereby expanding the detectable range while maintaining detection sensitivity.
2Measurement precision
If the light detection portion is positioned close to the cloth for accurate detection, then the measurement precision is improved, but the structural complexity increases due to the need for precise positioning mechanisms
Solution Approach 1:
The patent integrates the light detection portion directly into the presser bar structure, merging the detection function with the existing pressing mechanism. The transparent window portion is formed as part of the presser bar, eliminating the need for separate positioning mechanisms and reducing overall device complexity while maintaining detection accuracy.
Solution Approach 2:
The presser bar itself serves dual functions: it presses the cloth during sewing and simultaneously houses the light detection portion with its transparent window. This self-service approach allows the existing structural component to provide detection capabilities without requiring additional complex positioning systems.
3Adaptability or versatility
If the pressing support portion is detachably attached to the body portion to allow replacement, then the adaptability is improved, but the device complexity increases due to the detachable attachment mechanisms
Solution Approach 1:
The patent divides the presser bar into separable components: a body portion containing the light detection portion and a detachable pressing support portion. This segmentation allows the pressing support to be replaced or adjusted according to different sewing requirements, improving adaptability while keeping the attachment mechanisms simple and modular.
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 system enables precise detection of cloth movement, allowing for consistent seam pitch formation by adjusting the needle operation speed based on real-time cloth movement data, improving sewing efficiency and accuracy.
Implementation Method 1
the light detection portion is, for example, an image sensor (imaging element) for detecting the light reflected on the cloth
Implementation Method 2
a window portion capable of transmitting the light is provided on a bottom surface of the body portion
Data Source
AI summary
Provided with a cloth movement detection device and a sewing machine capable of precisely detecting a movement of a cloth. A cloth movement detection device includes: a light detection portion configured to detect a light for detecting a movement of a cloth; a body portion configured to be detachably attached to a presser bar of a sewing machine, the light detection portion being installed in the body portion; and a pressing support portion configured to be detachably attached to the body portion, a cloth pressing portion capable of contacting with the cloth being formed on the pressing support portion, wherein a window portion capable of transmitting the light is provided on a bottom surface of the body portion, and the cloth pressing portion is located lower than the bottom surface of the body portion in a state that the pressing support portion is attached to the body portion.