Process and device for forming a transfer tail
AssigneeHoechst Aktiengesellschaft
InventorsJosef Bach, Horst Kollwig, Wolfgang Meitzner, Horst Weintritt, Ralf Ueberdiek
Life of this patent
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Abstract
The present invention relates to a process and a device for forming a transfer tail on winding bobbins of high-speed winding frames by use of an auxiliary thread guide which is swivelled over a predetermined track at a predetermined speed and, subsequently, passes the yarn over to the reciprocating thread guide. It is possible to obtain a transfer tail of adjustable and reproducible length even at high winding speeds.
Claims12
A process for forming an adjustable and reproducible transfer tail of yarn wound on a winding bobbin on a high-speed winding frame having a reciprocating thread guide moving through a planar operating zone having forward and reverse traverse limits and an auxiliary rotatable thread guide having a substantial grooved recessed portion for releasably engaging the yarn, the auxiliary rotatable thread guide being initially engaged with the yarn outside of the forward traverse limit of the planar operating zone for holding it in position to form a waste ridge on the bobbin, the process comprising the steps of applying sufficient rotational force to the auxiliary thread guide to positively and automatically rotate it at a predetermined angular speed independent of fluctuations in yarn tension or in surface properties of the yarn whereby preselected turns of yarn are consistently wound as a transfer tail on the bobbin, and continuing rotation of the auxiliary thread guide to rotate the grooved recessed portion forward traverse limit end of the operating zone of the reciprocating thread guide, releasing the yarn from the recessed portion to transfer it at a predetermined coordinated speed to the reciprocating thread guide after the transfer tail is completed to permit the winding to then proceed without undue sliding between the yarn and thread guides to completion under control of the reciprocating thread guide whereby the stress and damage to the yarn is minimized.
A device for forming an adjustable and reproducible transfer tail of yarn wound on a winding bobbin on a high-speed winding frame having a planar reciprocating thread guide moving through a planar operating zone having forward and reverse traverse limits comprising an auxiliary thread guide having a substantial grooved recessed portion for releasably engaging the yarn, rotatable bearing means mounting the auxiliary thread guide to rotate the substantial grooved recessed portion from positions outside of to positions just within the forward traverse limit of the operating zone and then past it to release the yarn to the reciprocating thread guide, drive means capable of applying a force to the auxiliary thread guide which rotates it at a predetermined angular speed when engaging the yarn in the substantial grooved recessed portion which speed is independent of fluctuations in yarn tension or surface properties of the yarn, whereby preselected turns of yarn are consistently wound as a transfer tail on the bobbin and the yarn is released without slippage to the reciprocating thread guide, and coupling means connecting the drive means to the auxiliary thread guide whereby the substantial grooved recessed portion may be moved from positions in front of the forward traverse limit of the operating zone to positions just within the forward traverse limit of the operating zone and past it whereby the yarn is transferred from the auxiliary to the reciprocating thread guide without slippage and whereby stress and damage of the yarn is minimized.
Dependencies are inferred from the claim text.