Thread supply device for textile machines
AssigneeAktiebolaget IRO
InventorKurt Arne Gunnar Jacobsson
Life of this patent
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Abstract
A thread supply device for a textile machine, which device includes a drum on which a thread is wound to form an intermediate thread storage, and from which the thread is withdrawn over one end of the drum for supply to the textile machine. A brake means is disposed adjacent the withdrawal end of the drum and acts on the unwinding thread for imposing a braking effect thereon. The braking means acts progressively on the unwinding thread as it moves peripherally relative to the drum for either increasing or decreasing the braking effect on the thread, depending upon the relative peripheral direction of movement of the thread.
Claims9
A thread supply device for textile machines, comprising a drum on which the thread issuing from a supply bobbin can be wound tangentially and withdrawn over the end either by rotation of the drum or, in the case of a stationary drum, by means of a disc-shaped or ring-shaped winding element rotating adjacent a free front drum rim while forming at least one thread winding such that the thread is withdrawn over a removal edge of the drum in the case of a rotating drum and over a sliding edge of the winding element in the case of a stationary drum, and that a thread control element is provided which is arranged stationary adjacent the removal edge in the case of a rotating drum and which serves as a lateral stop for the unwinding thread opposite the direction of movement of the removal edge, and which is located on the winding element adjacent the sliding edge in the case of a stationary drum and which limits the peripheral velocity of the thread unwinding about the sliding edge to the peripheral speed thereof, characterized in that, in order to use the thread supply device in small jacquard machines, a brake means acting progressively on the unwinding thread in the peripheral directon of the same is disposed in front of the thread control element in the sense of the thread rotation about the removal or sliding edge during thread removal such that the braking effect is amplified as the thread approaches the thread control element and is decreased as the thread moves away from the thread control element.
In a thread supply device for a textile machine, comprising a cylindrical drum structure on which a thread issuing from a supply bobbin can be wound tangentially and from which the thread can be withdrawn over one end, a winding structure for causing the thread to be wound on the drum structue, one of said structure being rotatable relative to the other of said structures about the longitudinal axis of said drum structure, and a stop structure disposed adjacent said one end of the drum structure and fixedly related to said winding structure for limiting the relative peripheral velocity between the drum structure and the withdrawn thread as the latter is removed from the drum structure and tends to move peripherally relative to said one end of said drum structure, the improvement wherein braking means is fixedly related relative to said stop structure and coacts with the withdrawn thread as it is unwound from said drum structure for applying a braking effect thereto, said braking means including a first brake portion extending peripherally of the drum structure adjacent said one end thereof for imposing a progressively increased braking effect on the withdrawn thread as the latter moves peripherally relative to the drum structure in a direction toward the stop structure, and said braking means including a second brake portion extending peripherally of said one end of said drum structure for progressively imposing a decreased braking effect on the withdrawn thread as it moves peripherally relative to the drum structure in a direction away from the stop structure.
Dependencies are inferred from the claim text.