Turret Positioning via Multi-Step Rotation for Winder Spindle Alignment
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Solution Overview
Problem
Conventional automatic turret type winders face issues with precise positioning of spindles during bobbin changeover due to mechanical wear and tear, particulate accumulation, leading to uneven winding tension and surface grooves, as the turret rotation is not uniform and can result in gaps or excessive pressure between the spindle and pressure roller.
Innovation Solution
The method involves rotating the turret in at least two discrete rotational movements at controlled speeds to ensure accurate positioning of the spindle, with a first movement positioning the bobbin close to the winding line and a second movement at a slower speed to precisely align the spindle with the pressure roller, using motor current or strain gauge sensors to stop and lock the turret at the optimal position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the turret is rotated using a clutch and pulley in synchronicity, then the automatic bobbin changeover is achieved, but the turret rotation becomes non-uniform due to mechanical wear and tear and particulate accumulation
Solution Approach 1:
The patent replaces the mechanical clutch-pulley synchronization system with an electronic control system using encoders and programmable logic controllers. The encoder mounted on the turret shaft provides precise positional feedback to the PLC, which then controls the motor drive to achieve uniform turret rotation, eliminating the reliability issues of mechanical wear and particulate accumulation in mechanical systems.
Solution Approach 2:
The patent implements a feedback control system where an encoder mounted on the turret shaft continuously monitors the turret's rotational position and provides feedback to the PLC. The PLC uses this feedback information to adjust the motor drive signals, ensuring the turret rotates at the correct speed and position, thereby maintaining uniform rotation despite mechanical variations.
2Ease of operation
If the turret rotation speed and positioning are controlled by pre-set time and speed parameters, then the positioning process is simplified, but the spindle positioning precision deteriorates due to non-uniform turret movement
Solution Approach 1:
The patent replaces simple time-speed parameter control with an electronic feedback control system. The encoder provides real-time positional feedback to the PLC, which dynamically adjusts the motor drive to achieve precise spindle positioning. This electronic system maintains operational simplicity while dramatically improving positioning precision by compensating for non-uniform turret movement.
Solution Approach 2:
The encoder feedback system continuously monitors the turret's actual rotational position and provides this information to the PLC. The PLC compares the actual position with the target position and adjusts the motor drive accordingly, ensuring the spindle is positioned precisely at the winding position even when turret rotation is non-uniform due to mechanical variations.
3Productivity
If the pressure roller exerts pressure on the spindle, then the winding process is maintained, but gaps or excessive pressure occur leading to uneven winding tension and surface grooves
Solution Approach 1:
The encoder feedback system ensures the turret is positioned precisely at the winding position, which maintains a consistent and correct gap between the pressure roller and the spindle. This precise positioning feedback prevents both gaps that would cause loose winding and excessive pressure that would cause surface grooves, ensuring uniform winding tension while maintaining continuous production.
Data Source
AI summary
The invention relates to an automatic turret type yarn winding device. The automatic bobbin changeover process involves winding of yarn on a bobbin, followed by rotation of the turret to bring an empty bobbin into the winding position. Pressure rollers are provided to ensure consistent and accurate winding. The accurate relative positioning of the bobbins and pressure rollers is important. Wear and tear and particulate dust may cause malfunctioning of winder systems which may affect accuracy of turret rotations and relative positioning of the bobbins and pressure rollers, especially when the turret rotation during bobbin changeover stage is done in a single rotation. The invention provides a device and a method to position spindle precisely in turret type automatic winder, especially to identify correct stationing position of turret spindle after reverse movement post doffing. It involves, during the bobbin changeover process, the step of rotating the turret in at least two discrete rotational movements carried out at controlled speeds, whereby the empty bobbin assumes its accurate winding position.