Patent GB-538099-A (GB)
Title: Improvements in or relating to tension devices for yarn and like winding and like machines
IPC: B65H59/24
Filed: 1940-01-18
Abstract: 538,099. Winding yarns. UNIVERSAL WINDING CO. Jan. 18, 1940, Nos. 1141 and 1142. Convention dates, Jan. 19, 1939, and May 5, 1939. [Class 120 (ii)] A tension device for winding and like machines for yam and the like comprises opposed strandengaging members one being movable and adapted to be urged towards the other to apply tension to the yam &c. a pivoted member associated with the movable member and adapted to be coupled to a movable part of the machine and to be moved by such part about its pivot to vary the tension exerted on the yam, resilient means acting on the movable member to urge it against the yarn or the like, a link coupling the pivoted member to the resilient means to maintain the latter under stress and means for adjusting the connection between the link and the pivoted member towards and away from the pivoted axis of the latter so as to adjust the extent to which the tension applied to the yarn &c. is varied. The pivoted member may be connected to the swinging frame carrying the traversing thread guides which bears on the mass of yarn being wound and the tension is progressively relieved as winding proceeds in direct proportion to the increase in linear speed of the yarn, so that the ultimate tension applied to the yarn is substantially constant; means may be provided for gradually reducing the pressure of the thread guide during this operation. As shown the yarn in its passage from the supply to the traversing thread guide passes between a pair of tension discs 21, 22 rotatable on a spindle 23 and forced towards each other to bear against the thread by flexible resilient diaphragms 35 of rubber &c. one of which is fixed to the spindle 23 which is slidable in a screwed sleeve 25 bearing against the other diaphragm and adjustable on the frame 30 to vary the initial pressure between the tension discs; the diaphragms may be replaced by spider-like springs. The end of the spindle 23 is bifurcated and carries a pin 91 disposed in a slot 92 in an extension 90 connecting the spindle to a pivoted lever 80, the pin 91 being normally retained at one end of the slot by a spring 102 connected to the pin and a pin 100 on the extension 90 but being movable to the other end of the slot to allow the tension discs to be separated for inspection and cleaning. The lever 80 is pivoted on a stud 76 at the end of an arm 52 of a bifurcated tension lever 50 forming the pivoted member and pivoted on a stud 10 on the machine frame, the lever 50 intermediate the studs 10 and 76 and carrying a stud 59 having an eccentric collar 60 engaging the sides of an opening 85 in the lever 80 which has a narrow slot leading to the opening 85 and causing the opening to engage the collar resiliently. The stud 59 and consequently the lever 50 is connected by a link 65 to a stud 68 engaging one of a series of holes in a bracket 69 adjustably fixed to a bracket 5 on the swinging traverse frame 8 and as this frame rotates clockwise about the shaft 4 during winding the spindle 23 is moved to decrease the pressure between the tension discs ; by turning the collar 60 of the stud 59 in the opening 85 of the lever 80, the lever is swung about the stud 76 and varies the extent of the sliding movement imparted to the spindle 23 and thereby the extent to which the tension is relieved during the winding. The bracket 15 is adjustably mounted on the frame 8 and has a series of slots 14 one of which is engaged by the hooked end of a link 13, the other end of which engages a weighted lever 9 pivoted on the stud 10 and as winding proceeds the lever 9 is raised to reduce the effect of the weight 11 resisting the movement of the thread guide away from the winding spindle. In a modification the spindle 23 and extension 90 are replaced by a one-piece member or by a two-piece pivoted member and the sleeve 24 extends through the tension discs and resilient members ; the levers 50, 58 may be replaced by a single lever having two arms one of which is turned back and slotted to receive the connection to the link.