B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
242/9
B65H 23/00 (2006.01) B65H 19/18 (2006.01)
Patent
CA 1105432
ABSTRACT The present invention relates to a device to dampen and compensate automatically the pulling force which is exerted on a strip undergoing a high acceleration during its entrainment. The problem which exists here is that when a strip is unwound from a stopped reel, the pulling force exerted on the strip subjects the material to excessive tensile stresses, which may exceed the limit value of resistance of the material, thereby causing tears or breaks. The device of this invention dampens and compensates the com- bined effect of the pulling and resisting forces, so as to reduce the ten- sions which are produced. The device comprises idler rollers sliding on a guide which deflect the strip, and a dampening device which is applied to the deflecting action of the roller, and which is adjustable so as to exert on the strip a constant counter-push, which is always lower than that which would cause a tear in the strip. The deflecting device moves progressively backwards, in relation to the push exerted on it by the accelerated strip. The device is applied to a portion of the strip between the starting point of the entrained strip and the point at which there is exerted the pulling action. This progressive dampening action has the effect of compensating and taking up the strong push which occurs when the strip is highly accelerated and subject to a rapid and violent pulling action.
321812
Fetherstonhaugh & Co.
Giusti Giampiero
LandOfFree
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