Mechanical Roving Stop Device for Core Yarn Spinning
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Solution Overview
Problem
Existing roving stop devices for core yarn spinning machines, particularly those used in producing 'Duo Core' yarn, face challenges with electrical sensors that require specialized maintenance, are costly, and are incompatible with the narrow spindle gauge of 'Duo Core' yarn production, while mechanical devices are not suited for dual filament production.
Innovation Solution
A mechanical roving stop device that employs a mechanism with independent activating means for each continuous filament, using filament guide rollers and levers to stop the roving supply upon breakage, eliminating the need for electrical sensors and allowing adaptation for single or dual filament production by activating or inactivating levers accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical sensors are used to detect filament breakage, then breakage detection reliability is improved, but maintenance complexity and cost increase
Solution Approach 1:
The patent replaces electrical sensors with a purely mechanical detection system. The mechanical lever follows the contour of the filament bundle, and when breakage occurs, the lever rotates due to gravitational force, directly triggering the stop mechanism. This eliminates electrical components and their associated maintenance requirements while maintaining reliable breakage detection.
Solution Approach 2:
The mechanical lever system automatically detects breakage through its own gravitational response without requiring external power sources or complex electronic circuits. The system uses the weight of the lever itself and the gravitational field to detect filament integrity, making it self-sufficient and maintenance-free.
2Difficulty of detecting and measuring
If electrical sensors are used to monitor multiple filaments, then detection capability is improved, but cleaning frequency increases
Solution Approach 1:
The patent replaces electrical sensors with a mechanical lever that physically contacts the filament bundle. This mechanical approach eliminates the accumulation of dust and contaminants that plague electrical sensors, as the lever's detection mechanism is not sensitive to dirt accumulation in the same way electrical components are.
3Device complexity
If mechanical roving stop devices are used, then maintenance cost is reduced, but compatibility with Duo Core yarn production is lost
Solution Approach 1:
The patent designs a universal mechanical stop device with multiple independent levers (first lever for first filament, second lever for second filament) that can detect breakage in either or both filaments. The system can be configured for single filament or dual filament production, making it adaptable to both traditional core yarn and Duo Core yarn manufacturing while maintaining mechanical simplicity and low maintenance costs.
Solution Approach 2:
The patent divides the detection system into separate, independent levers for each filament position. This segmentation allows each lever to independently monitor its assigned filament while the overall system maintains mechanical simplicity. The modular design enables flexibility in configuring the system for different production requirements.
4Area of stationary object
If electrical sensors are installed in narrow spindle gauge configurations, then monitoring coverage is improved, but handling and maintenance difficulty increases
Solution Approach 1:
The patent replaces delicate electrical sensors with robust mechanical levers that can withstand the narrow spacing conditions of Duo Core yarn production. The mechanical components are inherently more durable and easier to access for maintenance in tight spaces compared to fragile electrical sensing elements.
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 mechanical roving stop device effectively stops the roving supply without electrical sensors, reducing maintenance costs and enabling compatibility with 'Duo Core' yarn production by using mechanical means to manage both filaments, ensuring efficient yarn production with reduced operational complexity.
Implementation Method 1
a first filament guide roller (7a) acting as a guide for the first continuous filament (4a) at the extremity of the first activating lever (6a)
Implementation Method 2
a spring (13) arranged to be compressed by manually displacing the supporting slide (11) until the trigger (9) becomes locked in the aforementioned notch (12)
Implementation Method 3
the stop element (2) presents a body (2a) with a curved surface configured in order to surround a portion of the curved surface of the lower roving supply roller (3)
Implementation Method 4
The activation of the stop element takes place when the tension of either one of said first or second continuous filaments on the first or second roller ceases.
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
Roving stop device for a core yarn ring-spinning machine, comprising a stop element arranged to be able to act, in an active position, on a pair of roving supply rollers to stop the supply of roving when breakage of a continuous filament occurs, and a mechanism to activate the stop element when said breakage occurs, and it is characterized in that said mechanism comprises; first activating means for displacing the stop element towards the active position upon breakage of a first continuous filament intended to be fed to a core yarn, and second activating means for displacing the stop element towards the active position upon breakage of a second continuous filament intended to be fed to said same core yarn.