Yarn feeding device with constant adjustable tension, particularly for feeding yarns to weaving and knitting machines and devices
AssigneeRoj & Vella S.p.A.
InventorSergio Vella
Life of this patent
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Abstract
A yarn feeding device for feeding yarns to weaving and knitting machines and devices with a constant, adjustable tension, in which a yarn reserve is wound onto a stationary cage by means of a rotating framework. The device also comprises means for braking the yarn, and means for regulating the action of said brake means and for modifying the amount of said reserve. In this device, the yarn is drawn with a constant tension, and is sent to the weaving or knitting machine or device as if it were drawn from a stationary reserve.
Claims7
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.
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.
Dependencies are inferred from the claim text.