| 摘要 |
PCT No. PCT/EP86/00305 Sec. 371 Date Jan. 13, 1987 Sec. 102(e) Date Jan. 13, 1987 PCT Filed May 20, 1986 PCT Pub. No. WO86/06765 PCT Pub. Date Nov. 20, 1986.A yarn feeding device adapted for positively feeding elastic yarn comprises an electric motor, a speed sensor for the speed of the knitting machine and a control unit connected to the electric motor and to the speed sensor. An optimal dynamic behavior of the yarn feeding device is obtained by making use of a rotatable drive cylinder connected to the electric motor, of a rotatable guide shaft supporting the yarn supply spool, which shaft is slidably arranged such that the yarn supply spool is kept in permanent contact with the drive cylinder, wherein the control unit drives said rotatable drive cylinder with a variable speed depending on the actual speed of the knitting machine and on a yarn demand signal, wherein the range of yarn feeding speeds is limited by predetermined minimum and maximum values.
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