GB702522A - Improvements in means for controlling the degree of stretch of yarn in a yarn-sizingmachine - Google Patents

Abstract

702,522. Sizing yarns. HOLT, Ltd., T., and HOLT, F. Dec. 12, 1950 [Sept. 27, 1949], No. 24731/49. Class 120(3) [Also in Groups VIII and XXIV] A yarn sizing machine comprises a draw roller 18, quetch roller 12, size bath 13, squeeze rollers 14, 15, drying cylinders 16, a delivery roller 17 and a receiving roller 11, and means are included for driving the draw. and quetch rollers at different speeds to impart stretch to the yarn, said means comprising a differential gear 24 one side of which is driven from the receiving roller 11, a conical drum 27 driven from the delivery roller 17, a friction disc 26 bearing against the cone and slidable Upon a shaft 25 connected to the cage of the differential gear, and a P.I.V. (Registered Trade Mark) gear the control screw 35 of which is driven from the differential gear 24. The draw and quetch rollers are driven through the shafts 37 and 38 respectively of the P.I.V. gear, and the delivery and receiving rollers 17 and 11 are rotated by the passage of the yarn. In order to vary the degree of stretch, the disc 26 may be moved along the cone 27. so causing a rotation of a sprocket 32 of the differential gear which in turn drives the control screw 35 of the P.I.V. gear varying the ratio of the speeds of rollers 18 and 12. Since the rollers 11 and 17 are driven form the rollers 12 and 18 by the passage of the yarn, the speeds of the rollers-18 and 12 will alter the speeds of the drum 27 and the shaft 23 of the differential until the original ratio of the speed of the shaft 25 to that of shaft 23 is obtained and there is no further rotation of the control screw 35. The disc 26 is provided with a scale to afford visual indication of the degree of stretch. Measuring devices may be fitted to the rollers 11 and 17 to indicate the length of yarn passing each.