Patent ID: 7874510
Filing Date: 2011-01-25
Classification: B65B,B65H

Abstract:
1. An apparatus permitting a material to be unwound from a coil of the material while applying a proportional braking force to the coil as the diameter of the coil is reduced by unwinding the material from the coil of the material, the apparatus comprising: a carriage for receiving a coil of material such that the coil can be rotated about a longitudinal axis of the coil by pulling the material from the coil to unwind the material from the coil, said carriage including; a first carriage arm having opposed first and second ends; a second carriage arm having opposed first and second ends; first and second laterally spaced and parallel weight transfer rollers; first and second laterally spaced and parallel force application devices; said first force application device is attached to said first end of said first carriage arm, and said first weight transfer roller is attached to said second end of said first carriage arm; said second force application device is attached to said first end of said second carriage arm, and said second weight transfer roller is attached to said second end of said second carriage arm; wherein said first carriage arm is pivotally attached to a first support at a position closer towards said first weight transfer roller than said first force application device; wherein said second carriage arm is pivotally attached to a second support at a position closer towards said second weight transfer roller than said second force application device; wherein said first and said second weight transfer rollers support the coil of material at circumferentially spaced locations on the periphery of the coil and are caused to moved downwardly and outwardly in opposite directions along separate and respective arcuate paths by the weight of the coil of material when the coil of material is received by said carriage; wherein said first and said second force application devices are biased against and apply a braking force against the rotation of the coil of material about the longitudinal axis at circumferentially spaced locations on the periphery of the coil of material by the downwardly and outwardly movement of said first and said second weight transfer rollers respectively; wherein a first and a second spaced, parallel guide plates attached to said first carriage arm for rotation therewith and transverse to said first weight transfer roller and said first force application device, the coil of material being positionable between said first and said second guide plates when the coil of material is received by said carriage; wherein a third and a fourth spaced, parallel guide plates attached to said second carriage arm for rotation therewith and transverse to said second weight transfer roller and said second force application device, the coil of material being positionable between said third and said fourth guide plates when the coil of material is received by said carriage; and wherein the spacing between said first and said second guide plates and a spacing between said third and fourth guide plates are adjustable to accommodate the width of the coil of material.