Patent GB-1072761-A (GB)
Title: Continuous yarn winding method and apparatus
IPC: D01D7/00
Filed: 1965-01-29
Abstract: 1,072,761. Continuously winding yarns. TOYO RAYON KABUSHIKI KAISHA. Jan. 29, 1965 [Jan. 29, 1964; April 10, 1964; April 14, 1964], No. 4112/65. Heading D1J. The invention is concerned with a continuous yarn winding method and apparatus and is characterized in that when one package is full and the yarn has to be transferred to the next empty bobbin to be wound, a guide carrying member is set in motion that hooks the yarn at a point between its supply source and a fixed guide disposed upstream of a traverse guide and carries the resulting loop to one end of the empty bobbin where the yarn is seized and severed and wound onto the empty bobbin. The yarn leading to the supply is then automatically taken up by the yarn traversing means of the empty bobbin. The guide carrying member may be an endless chain or belt. The apparatus may include means for displacing the yarn paths back and forth when and as necessary in such a manner that the guide carrying member cannot hook the yarn other than at said point between the fixed guide upstream of a traverse guide and the yarn supply source; and the yarn paths created by the loop formed by said travelling guide will be so positioned that only the one leading to the yarn supply is snagged by yarn catching means associated with the empty bobbin. In Fig. 4 the yarn from supply 5 passes a fixed guide 4 and is wound onto a bobbin 2. When the package Y on bobbin 2 is complete an endless belt carrying a guide 11 is set in motion. The guide 11 hooks the yarn yl at station I between the supply 5 and the fixed guide 4 and draws a loop y2 of the yarn over the guide 4 and then down as at y3 to a yarn catcher (not shown) on one end of the next bobbin 3 to be wound. The yarn catcher snags and severs the yarn and causes it to be wound onto the bobbin 3. The plane of the belt is such that the guide 11 cannot snag the yarn at any position other than at the station I. In the case of thick yarn there may be a knife (37), Fig. 5 (not shown), that is hooked shaped and is provided with a cutting edge at its tip. When the looped yarn y3 is at station III, Fig. 4, a solenoid (38) rotates the knife (37) to cause it to engage and move the yarn into an incised portion (35) of the bobbin so that the yarn is snagged, further rotation of the knife then causing the yarn to be cut. Figs. 6 to 8 (not shown) illustrate how the invention is applicable to bobbins that are co-axial, there being yarn push-out guides (9, 9') and fixed guides (4, 4') that are automatically controlled by limit switches to cause them to recede from or extend into the path of the yarn in a predetermined manner according to whether a loop of the yarn is to be caused to travel towards bobbin (2) or bobbin (3) for yarn transfer thereto. Figs. 9 to 11 (not shown) illustrate a further embodiment in which additional fixed guides (10, 10') are used that control the paths of the looped yam more strictly to ensure that the yarn is not caught and severed by string- ing up openings (60, 60') of grooved yarn traversing drums (7, 7'). The additional fixed guides (10, 10') assist in the formation of transfer tails. Figs. 12 and 13 illustrate a further embodiment in which a retractable yarn push out guide 9 and retractable fixed guides (4, 51) are so controlled that guide (11) misses the yarn when travelling along an upper run but engages the yarn when passing on a lower run over the guides (4, 51), the guides then drawing a loop of yarn over the guides (4, 51) as shown in Fig. 14B (not shown). The guides (4, 51) then retract with the yarn still thereon, and when the guide (11) reaches the setting shown in Fig. 12, the yarn from the delivery source is snagged by and transferred to the fresh windup bobbin 3.