Unwinding arrangement
AssigneeAktiebolaget Profor
InventorH.ang.kan Lesse
Life of this patent
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Abstract
Unwinding arrangements for material webs which are consumed continuously by such as packing machines which machines are provided frequently with an arrangement which brakes the roll so that it does not continue to rotate when the unwinding ceases. To make possible well adapted braking, the unwinding arrangement in accordance with the invention, is provided with a maneuvering arm adapted to be acted upon by the material, which, in the event of changes in the web tension, presses with a varying force a rotatable braking appliance against a brake drum combined with the material roll.
Claims11
Unwinding apparatus for a material web comprising a roll stand, a maneuvering arm having an end acted upon by said material web, means mounting the arm on the roll stand for movement in response to tension in the material as it unwinds from the roll stand, brake means including a braking surface and a brake drum, and roller means for applying the braking surface to retard the brake drum in response to a reduction in tension in the material web as it unwinds, said maneuvering arm being supported on said roll stand at a point of support, said point of support located on a side of said brake drum that faces away from said end of the maneuvering arm acted upon by said material web.
Unwinding apparatus for a material web comprising a base, a rotary shaft on the base for mounting a spool containing a material web, a maneuvering arm mounted on said base for swinging movement about a first axis, pulleys on said arm and on said base for guiding a web as it unwinds from the spool, said pulleys being arranged to swing said arm in a first direction as tension in the web increases, said arm being mounted to swing in a direction opposite to said first direction in response to gravity as tension in the web decreases, said arm including a braking surface adjacent said rotary shaft, a brake drum on said shaft, said arm also having a roller between said braking surface and said brake drum, said braking surface being positioned on said arm to move away from said drum upon movement of said arm in said first direction and toward said drum upon movement in the opposite direction, said roller being arranged to engage the braking surface and the drum to retard the rotation of the drum when the tension in the web decreases.
Dependencies are inferred from the claim text.