Overlock Sewing Machine Single Switch Mode Detection
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Solution Overview
Problem
Existing overlock sewing machines face difficulties in threading looper threads due to complex and costly mechanisms for switching between threading and sewing modes, requiring multiple components and dedicated spaces which hinder compact design and increase costs.
Innovation Solution
A simplified configuration using a single switch to detect mode switching and looper cover status, incorporating a swing lever, detection lever, cover detection shaft, and operation limiting portions to enable or disable motor driving based on looper cover position, allowing seamless transition between threading and sewing modes without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated looper cover open/closed detection switch is arranged as a separate component, then the sewing machine can detect looper cover status, but the machine size increases and cost increases due to requiring dedicated space and additional components
Solution Approach 1:
The patent combines the looper cover open/closed detection function with the existing threading-mode/sewing-mode switching knob by integrating a single detection switch that serves both purposes. The detection switch is positioned to detect the switching knob's position (indicating threading or sewing mode) and simultaneously detect looper cover status, thereby eliminating the need for a separate dedicated detection component.
Solution Approach 2:
The detection switch is designed with multi-functionality to perform both mode switching detection and looper cover status detection. By making the detection switch universal, the patent reduces the total number of components while maintaining reliable detection of both operational states.
2Volume of moving object
If the detection switch mechanism is arranged in a small space below the front cover with the switching mechanism, then the machine remains compact, but the mechanism becomes complicated and difficult to assemble
Solution Approach 1:
The patent merges the detection switch mechanism with the existing switching knob mechanism, allowing both detection functions to be integrated into a single compact assembly. This combination maintains the small space requirement while simplifying the overall mechanism by reducing the number of separate components that need to be assembled.
3Volume of moving object
If the motor clutch mechanism is arranged in the same space as the detection switch, then the machine remains compact, but the mechanism becomes even more complicated
Solution Approach 1:
The patent segments the functional areas within the limited space by positioning the detection switch and motor clutch mechanism at different locations below the front cover. The detection switch is arranged in the rear portion while the motor clutch mechanism is positioned in the front portion, allowing both mechanisms to coexist in the same general space without excessive complexity.
Solution Approach 2:
The patent utilizes spatial arrangement in multiple dimensions by positioning components at different locations (front/rear, upper/lower) within the compact space below the front cover. This dimensional arrangement allows the detection switch and motor clutch mechanism to be integrated without creating an overly complicated mechanism.
Data Source
AI summary
In an overlock sewing machine, a main shaft fixing operating shaft is provided with a differentiation ring that can be swung in a predetermined range such that, when the rotation of a main shaft is to be enabled, it is set to an enable state in a stationary state, and when the rotation of the main shaft is disabled, it is swung and shifted from the enable position. Furthermore, a looper cover open/closed detection configuration is configured by modifying a part of a typical known configuration. Such an arrangement provides an overlock sewing machine having a simple configuration that requires only a single micro switch to detect the switching between the threading mode and the sewing mode and to detect the open/closed state of the looper cover.