Patent ID: 7104483
Filing Date: 2006-09-12
Classification: B65H

Abstract:
1. Method for stabilizing and regulating the tension of a thread ( 16 ) being unwound from a bobbin ( 18 ), which comprises adding an unwinding tension (t d ) to a resistant tension (Δt) on said thread, said resistant tension being automatically varied in relation to the intensity of said unwinding tension (t d ) so that the tension (t 2 ) of the thread ( 16 ) at the exit from the tensioning device ( 10 ) is substantially constant as the thread is wrapped at a wrapping angle (α) which is varied wherein said resistant tension (Δt) is generated and controlled by an arm element ( 12 ), oscillating around a rotational axis (X), suitable to make said thread ( 16 ) to wind, for a variable range of the wrapping angle (α), on a cylindrical body ( 21 ), coaxial to said rotational axis (X) said arm element ( 12 ) being subjected to the action of said unwinding tension (t d ) of said thread ( 16 ), increased by said resistant tension (Δt), and to the action of a contrasting force (P) which opposes an unwinding tension (t d ), increased by said resistant tension (Δt).