Open-End Rotor Spinning Machine Thread Piecing Control
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Solution Overview
Problem
Open-end rotor spinning machines face challenges in producing high-quality piecings after malfunctions without the need for expensive service units, with existing devices lacking precise coordination of fiber feed and yarn withdrawal, leading to substandard piecings.
Innovation Solution
A cost-effective open-end rotor spinning machine design that allows for manual thread preparation and precise control of yarn return, using a stationary device for cutting yarn to length and a control device for synchronized feeding into the spinning rotor, with optional individual drives for adaptable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a service unit with mobile thread handling elements is used to handle thread breakages, then thread piecing can be performed, but the structural complexity and cost increase significantly
Solution Approach 1:
The invention extracts the essential thread handling functions from the complex mobile service unit and implements them as simple stationary devices at each workstation. The suction nozzle, thread guide, and fiber ring are positioned statically at the spinning station, eliminating the need for mobile service units while maintaining thread piecing capability.
Solution Approach 2:
The workstation is designed to handle thread breakages autonomously using simple integrated components. The stationary thread handling device works in conjunction with the spinning rotor itself to perform piecing operations without requiring external mobile service units, making each workstation self-sufficient.
2Ease of operation
If a piecing aid is used to shorten and prepare threads, then thread retrieval is enabled, but the coordination of fiber feed and yarn withdrawal becomes uncontrolled
Solution Approach 1:
The invention implements feedback control by synchronizing the thread take-off device with the spinning rotor speed. The control device monitors rotor speed and adjusts the fiber feed rate and yarn withdrawal rate accordingly, ensuring coordinated operation and high-quality piecing. This feedback mechanism guarantees that fiber feed into the rotor and yarn withdrawal from the rotor occur at precisely matched rates.
Solution Approach 2:
The system transitions from static, uncoordinated piecing operations to dynamic, synchronized control. The fiber feed rate and yarn withdrawal rate are dynamically adjusted based on real-time spinning rotor speed, enabling precise coordination and high-quality piecing that adapts to varying operational conditions.
3Adaptability or versatility
If individual drives are used for work station components, then adaptability and precise control improve, but device complexity increases
Solution Approach 1:
The invention divides the drive system into segmented individual drives for each workstation component (spinning rotor, thread take-off device, fiber feed mechanism). Each component has its own motor and control, enabling independent adjustment and precise coordination. This segmentation provides adaptability while keeping each drive unit simple and manageable.
Data Source
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AI summary
The invention relates to an open-end rotor spinning machine with work stations, each of which has a spinning device for producing a yarn, a yarn take-up device (18) and a winding device (33) for producing a cross-wound bobbin (22), wherein the spinning device has a spinning rotor (4) rotating at high speed in a spinning housing, a fiber ribbon dissolution roller (12) and a fiber ribbon feed cylinder (14) driven by a single motor and the yarn take-up device (18) can be actuated by a single drive (19).According to the invention, each work station (2) has a device (10) for cutting a thread (30) manually retrieved from the cross-wound bobbin (22) to a defined length, a storage device (37) for receiving a specific quantity of thread, and a drive device (7) for lifting the cross-wound bobbin (22) from the bobbin drive roller (23), the drive (19) of the thread take-up device (18) is reversibly operable, and a manually activatable control device (9) is provided which, during the spinning process, controls the drive (19) of the thread take-up device (18), the drive (15) of the fiber tape feed cylinder (14), and the drive device (7) for lifting the cross-wound bobbin (22) according to a predetermined spinning program.