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Title: Yarn feeding device with constant adjustable tension, particularly for feeding yarns to weaving and knitting machines and devices
Claims: I claim: 1. A yarn feeding device for drawing yarn from a supply and feeding it with constant adjustable tension to a weaving or knitting machine or the like, comprising a frame, a fixed hollow body consisting of a cage supported by a hollow shaft mounted cantilevered on said frame and having an inner funnel-shaped guide member, the yarn coming from said supply being wound into turns around the cage to form thereon a yarn reserve, a rotating framework mounted on said hollow shaft on the outside of said fixed cage, means to rotate said framework, oscillating means on said fixed cage and oscillated by said rotating framework to advance the yarn turns forming said reserve on the cage means to adjust and keep uniform the amount of said reserve, brake means bearing yieldably against the cage to tension the yarn leaving the device, means to adjust the pressure with which the brake means bears against the cage, the yarn unwinding from said reserve passing between the brake means and the cage, and subsequently through the funnel-shaped member, before coming out of the device in the same direction of its inlet into the device itself, said brake means comprising at least one braking element, elastically pressed in an axial direction against a free outer edge of said cage by said rotating framework, said braking element comprising a ring and a set of elastic spokes converging into a central hub of the ring, and an adjustable screw on the rotating framework acting against said hub to press the braking ring against the cage, said screw being coaxial with the hollow shaft and freely rotatable in said hub. 2. A yarn feeding device as in claim 1, in which said means for adjusting and keeping uniform the yarn reserve consists of a feeler mounted on said cage and controlling the running of an electric motor that rotates said framework. 3. A yarn feeding device as in claim 1, in which said means for causing the advancement of the reserve yarn turns along the cage comprises an oscillating plate transverse to the axis of the cage and projections on the rotating framework to oscillate said plate. 4. A yarn feeding device for drawing yarn from a supply and feeding it with constant adjustable tension to a weaving or knitting machine or the like, comprising a casing, and in the casing: a fixed hollow body comprising a cage, comprised by a bottom plate, a set of side columns, and a funnel-shaped top member having a wide upper edge and extending downwardly into the cage itself; and a hollow shaft, supporting said cage, mounted cantilevered on said casing; a framework surrounding said cage and mounted rotatably on said shaft, comprising a bottom element with a hub, two lateral uprights, and an upper closure element; an oscillating plate mounted on the cage, close to the bottom plate thereof, surrounding said shaft and traversed by said columns, and projections on the bottom element of said rotating framework operating on said plate to cause the oscillation thereof; a ring-shaped braking element bearing yieldably against the upper edge of the funnel-shaped member of the cage and urged thereagainst by the upper closure element of said framework; an electric motor, connected by means of a flexible transmission, to a pulley of said hub of the rotating framework; an inlet brake mounted on the casing; and a feeler, frictionally connected to said cage, between the columns and the funnel-shaped member, to control the operation of said motor; the yarn to be fed passing into said casing through said inlet brake and being caused by said rotary framework to wind around said cage into several turns, said turns being caused to advance by said oscillating plate, up to when the advancing front of the turns engages said feeler, to pass subsequently under said ring-shaped brake element, running along the inside of the cage funnel-shaped member along a generatrix thereof, and then entering said hollow shaft, and finally emerging from the casing. 5. A yarn feeding device as in claim 4, in which the bottom plate of the cage bears against a shoulder of the hollow shaft, and the funnel-shaped member is fixed with its bottom to the end of the same shaft, so as to lock the side columns against said bottom plate, and seats for said columns on the funnel-shaped member and on the bottom plate of the cage. 6. A yarn feeding device as in claim 4, in which one of the lateral uprights of the rotating framework has two yarn-guiding eyelets thereon. 7. A yarn feeding device as in claim 4, in which said ring-shaped brake means comprise a braking ring and a set of elastic spokes converging into a central hub of the ring, and an adjustable screw on the rotary framework acting against said hub, to press the braking ring against said upper edge of the funnel-shaped member of the cage, said screw being coaxial to the hollow shaft and freely rotatable in said hub. Other info: Inventors: Vella, Sergio (Biella, IT) Application Number: 441864 Filing Date: 1974-02-12 Publication_date: 1976-02-24 Assignee: Roj & Vella S.p.A. (Biella, IT) Primary Class(es): 242/364.7 66/132R, 139/452, 242/365.4, 242/366.2 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Gilreath, Stanley N. Assistant Examiner: Attorney: Young & Thompson |
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