Method for making tapered yarn windings

Details Method for making tapered yarn windings Method for making tapered yarn windings

B - Operations, Transporting

65

H

B65H 55/04 (2006.01) B65H 54/32 (2006.01)

Patent

CA 2377262

The invention concerns a method for making a tapered yarn bobbin obtained by depositing superposed layers (L3) of a yarn on a cylindrical support (20) with a longitudinal axis (X), and comprising a base cone (12) with generatrix (L2), and a winding cone (13) with genratrix (L3) and a main body (11) with generatrix (L1) inclined relative to the axis (X) and linking the two generatrices (L2, L3) of the two cones (12, 13). The method is characterised in that it comprises two lags for displacing a yarn guide, one first lag enabling to form part of the base cone (12), the last yarn layer deposited along said first lag up to the end of the winding cone, and a second lag enabling to terminate said started base cone (12) and to form simultaneously the main body (11) and the winding cone (13), the first yarn layer deposited along the second lag being parallel to the last layer deposited along the first lag.

Procédé de fabrication d'une bobine tronconique obtenue par dépôt de couches superposées d'un fil sur un support (20) cylindrique d'axe longitudinal (X), et comprenant un cône de base (12) de génératrice (L2), un cône de dévidage (13) de génératrice (L3) et un corps principal (11) de génératrice (L1) inclinée par rapport à l'axe (X) et reliant les deux génératrices (L2, L3) des deux cônes (12, 13). Le procédé est caractérisé en ce qu'il comprend deux règles de déplacement du guide-fil, une première règle qui permet de former une partie du cône de base (12), la dernière couche de fil déposée selon cette première règle allant jusqu'à l'extrémité du cône de dévidage, et une seconde règle qui permet de terminer ledit cône de base (12) commencé et de former en concomitance le corps principal (11) et le cône de dévidage (13), la première couche de fil déposée selon la seconde règle étant parallèle à la dernière couche déposée selon la première règle.

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