| 摘要 |
An assembly (10) for feeding a web from a roll includes a frame (F) mounting a pair of vertical guides (22) carrying vertically movable hoist assemblies (16). Each hoist assembly (16) is motor-driven by a chain (60) fixed at its opposite ends and disposed about a drive sprocket (68), and an idler sprocket (66) carried by the frame. Each chain (60) is also disposed about an idler sprocket (48) and idler posts (50) carried by the hoist assembly (16) whereby rotary movement of the drive sprocket (68) in opposite directions causes the hoist assembly (16) to be raised or lowered along the vertical guide (22) thereby raising or lowering the roll. A roll web tension and drive assembly (90) is movable toward and away from the roll and includes a roll drive (M3, 124, 126, 128, 138) movable therewith for engaging and driving the roll.
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