Patent GB-780770-A (GB)
Title: Improvements in and relating to the winding of yarn
IPC: B65H54/44
Filed: 1955-04-26
Abstract: 780,770. Winding yarns. UNIVERSAL WINDING CO. April 26, 1955 [May 4, 1954], No. 12050/55. Class 120(2) A winding machine for winding a strand of yarn at a substantially constant predetermined speed comprises the combination of a rotatable arbor for holding a winding yarn package, means for applying a rotating force to said arbor, a rotatable drum, means for rotating said drum at a speed such that its surface speed is substantially equal to the predetermined winding speed, means for supporting the arbor for movement towards and away from said drum whereby the periphery of a winding package carried by the arbor can contact the drum to permit the drum to modify the rotating force to cause the package and arbor to rotate at the predetermined winding speed and means for traversing the strand of yarn across the winding package. The means for rotating the arbor may be an electric. motor mounted within the arbor itself or an electric motor driving the arbor by valve means. The supporting means for the arbor may be mounted on an eccentric arrangement such that the package moves away from the winding drum in a straight line instead of the usual arc. In the arrangement shown a strand o yarn y is drawn from a source of supply (not shown) and passes via a godet wheel 31, a roller 34 at the end of a tension compensating arm 35, over a guide bar 36 to a traversing guide 21 and hence is wound on a package core 30 which is in contact with and is driven by a driving drum 14. The package core 30 is mounted on a winding arbor 29 carried at the end of an arm 25 for rotation thereon, the arm 25 being carried by a shaft 28 journalled in arms 23 and 24. The arm 25 is mounted for pivotal and longitudinal movement by an eccentric arrangement such that the arbor 29 can recede from the driving drum 14 and the yarn guide 21 in a straight line such that the distances from the axis of the arbor to the yarn guide and to the driving drum increased by equal amounts. To prevent slippage between the driving drum 14 and the winding package the invention provides means for supplying a rotating force to the arbor 29 that is slightly less than the rotating force required to rotate the arbor and the package at the desired speed. For this purpose as shown in Fig. 3, an inverted constant torque electric motor 53 may be carried by the spindle 54 which is fixed at one of its ends to the arm. 25. The motor stator 57 is secured to the spindle 54 and the rotor 59 is, supported about the stator 57 by means of a tube 60 inside of which it is fixedly secured and which forms the package core receiving element of arbor 29. In a second embodiment an electric motor is mounted outside of the arbor and drives the latter by the belt drive arrangement. The arm 25 is connected by a link 68 and a lever 67 to a rheostat 66 in the motor circuit, the arrangement being such that as the arm 25 moves away from the driving drum 14 the current supplied to the motor is decreased so that less torque is applied to the arbor 29 and the winding package so as to decrease the tension at which the strand of yarn y is wound on to the package. A tension compensator arm 35 is also provided and is connected to some speed control circuit such that an increase in tension in the winding yarn y will pivot the compensator arm downwardly so as to cause the speed control circuit to decrease the current supplied to the motor 53 such that the latter exerts less rotating force on the arbor 29 thereby to relieve the excess in tension. Specification 751,166 is referred to. 780,771. Thread tensioning devices.. NAAMLOOZE VENNOOTSCHAP ONDERZOEKINGSINSTITUUT RESEARCH. April 29, 1955 [June 11, 1954], No. 12535/55. Class 120(2) A thread tensioning device comprising two members each provided with a plurality of tensioning elements, the tensioning elements of one member extending between those of the other member is characterized in that means are provided which are so positioned and coupled that that members may move relatively in the direction of movement of the thread as well as in the direction which determines the meshing of the tensioning elements, so that by varying the pressure exerted on the tensioning elements by the thread moving zing-zag between them the area of contact of the thread with the elements is diminished. In the arrangement shown tensioning members 2 and 3 are each supported by four rods (front rods 4, 5, 6 and 7 only shown) pivoted to a housing (not shown). The members 2 and 3 are crossconnected by a rod 21 and the upper member is acted upon by a spring 22 connected to an. adjustable slide 25 such that by adjusting the position of slide 25 the force connected on the member 2 is changed. In operation the members 2 and 3 are drawn towards one another by the spring 22 and the tensioning surfaces mesh completely. When a thread 29 passes through the tenioning device the members 2 and 3 are moved away from one another such that due to the arrangement of the rods the thread tensioning surfaces always remain parallel to each other. In a second embodiment the tensioning elements are in the form of rods attached to strips which are pivoted to a housing in a manner similar to the above. The rods are caused to move apart by means of a weight so as to increase the tensioning effect on a thread passing around the rods in a sinusoidal path.