Yarn Drum Inter-Storage with Independent Arm Motor
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Solution Overview
Problem
Existing textile machines face challenges in achieving consistent yarn tension during cross winding on bobbins, requiring complex and costly mechanisms for torque transfer between rotating drums and arms, limiting dynamic response and independence of arm movement.
Innovation Solution
A textile machine with a pivotably mounted drum and independently rotatable arm driven by a separate motor, allowing for independent control of speed and torque, eliminating the need for a movable guide plate and enabling the arm to rotate independently in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical rotary storage is used to transfer yarn from draw-off rollers to winding roller, then yarn intermediate storage is achieved, but the device becomes costly and constructionally complicated
Solution Approach 1:
The patent replaces the complex mechanical rotary storage system with a substantially two-dimensional drum surface that works in conjunction with a linearly moving arm. The drum rotates to advance yarn along its surface while the arm moves linearly to distribute yarn across the bobbin width, eliminating the need for complex mechanical torque transfer mechanisms between rotating drum and arm components.
2Speed
If torque is transferred from rotating drum to arm, then arm rotation is achieved, but dynamic response and independence of arm movement are limited
Solution Approach 1:
The patent divides the yarn distribution function into two independent segments: the drum handles yarn advancement through rotation, while the arm handles yarn distribution across the bobbin through linear movement. This segmentation allows each component to operate independently with optimized performance characteristics, improving dynamic response and movement independence.
Solution Approach 2:
The patent introduces dynamic independence by allowing the arm to move linearly independently of drum rotation. The arm's linear movement is not constrained by torque transfer from drum rotation, enabling flexible adjustment of yarn distribution speed and position regardless of drum rotation state, thereby improving adaptability and versatility.
3Ease of operation
If a movable guide plate is used to lead yarn, then yarn path control is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the yarn path control function from a separate movable guide plate mechanism and integrates it into the arm structure itself. The arm, which moves linearly to distribute yarn, inherently provides yarn path control through its movement, eliminating the need for additional movable guide plate components.
4Shape
If cross winding is performed with yarn distribution from extreme position to another, then bobbin formation is achieved, but yarn tension becomes unequal
Solution Approach 1:
The patent employs feedback control through sensors that monitor yarn tension and position during the winding process. The control system adjusts the arm's linear movement and drum rotation speed in real-time to compensate for tension variations, ensuring uniform yarn tension across the cross-wound bobbin while maintaining the desired bobbin shape.
Data Source
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AI summary
The invention relates to a drum inter-storage of yarn for a textile machine, which comprises a driven rotary drum (10) with a compensatory rotary arm (103), in which the driven rotary drum (10) is coupled with a first drive formed by an electric motor, and a compensatory rotary arm (103) is coupled with a second drive formed by an electric motor, whereby both the motors are connected to a control device. The invention also relates to a method of controlling a drum inter-storage (1) of yarn (0) at an operating unit of a textile machine, in which the operating unit comprises a spinning unit (3) for production of staple yarn (0) and a winding device (8) for winding the produced yarn (0) on a cross bobbin (4), whereby between the spinning unit (3) and the winding device (8) is arranged a draw-off mechanism (5) of yarn (0) from the spinning unit (3) and between the draw-off mechanism (5) of yarn (0) and the winding device (8) is arranged a drum inter-storage (1) of yarn (0) with a driven rotary drum (10) and with a compensatory rotary arm (103). Rotation of the compensatory rotary arm (103) with its own motor (1030) is controlled according to rotation of the drive of the drum (10) in such a manner that during continuous spinning a constant torgue is developed on the yarn (0) for creating required tension in the yarn (0) for winding the yarn (0) on the cross bobbin (4) and upon transition from continuous spinning to intermediate state speed and torgue of the compensatory rotary arm (103) is controlled independently of speed of rotation of the drum (10).