Process and device to determine the diameter of a bobbin at a spinning station of a spinning machine
AssigneeRieter Ingolstadt Spinnereimaschinenbau AG
InventorHoeber Gerhard
Life of this patent
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Abstract
The invention relates to a process to determine the diameter of a bobbin at a spinning station of a spinning machine processing fiber slivers as well as to a device to carry out this process. The object is to avoid listed disadvantages and to find the applicable diameter of a bobbin in a simple manner and without directly touching said bobbin.
Claims21
A process for acting upon and determining the diameter of a bobbin of wound yarn formed at a spinning station of a spinning machine, comprising the steps of:
- feeding a fiber sliver of known thickness at a given speed to a spinning element at the spinning station for being spun into yarn, drawing off the spun yarn at a given draw-off speed, and winding the yarn onto a bobbin at a winding speed synchronized with the draw-off speed;
- empirically determining a yarn length corresponding to a given bobbin diameter for predetermined conditions of yarn thickness and winding tension of the spinning station;
- determining actual sliver thickness, sliver feeding speed, and yarn draw-off speed and calculating yarn thickness from the product of sliver thickness and the ratio of sliver feeding speed and yarn draw-off speed;
- determining winding speed and calculating winding tension from the ratio of winding speed and yarn draw-off speed;
- comparing the calculated winding tension and yarn thickness with the predetermined yarn thickness and winding tension used to empirically determine the yarn length corresponding to a given bobbin diameter and computing a correction factor based upon any differences therebetween, and with the correction factor computing actual yarn length and corresponding actual bobbin diameter
- conveying the actual bobbin diameter to a travelling service unit;
- and
- after receipt of the actual bobbin diameter, performing one of bobbin replacement and yarn piecing at the spinning station with the travelling service unit.
A device for acting upon and determining the diameter of a bobbin at a spinning station of a spinning machine, the spinning station having a spinning element, a controlled sliver feeding device, a controlled yarn draw-off device, and a controlled winding device, said device comprising:
- rotational speed detection devices operably configured to measure the rotational speed of the sliver feeding device, the yarn draw-off device, and the winding device;
- a control system operably configured with said speed detection devices, said control system configured to compute correction factors relating to yarn thickness and winding tension by determining actual yarn thickness and winding tension from the rotational speed of the sliver feeding device, yarn draw-off device, winding device and known sliver thickness, and comparing actual yarn thickness and winding tension to empirically determined yarn thickness and winding tension derived from a known yarn length and known bobbin diameter, said control system applying said correction factors to determine actual yarn length and actual bobbin diameter;
- and
- a service unit in operable communication with said control system, said control system conveying actual bobbin diameter to said service unit, said service unit being configured to perform one of bobbin replacement and yarn piecing at said spinning station upon receipt of a signal from said control system indicating actual bobbin diameter.
Dependencies are inferred from the claim text.