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AssigneeBobst SA
InventorEdouard Borel
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A feed device for advancing a web into a processing station which acts on the web while the web is in a standstill position. The feeding device includes a first drive roller around which a second swivel roller oscillates between an upstream and downstream position to create a loop to take up the web during a dwell in the movement of the web through the processing station. The swivel roller is driven at the same speed as the drive roller by an arrangement of drive pinion and a counterweight is also rotated at the same rate by a gear arrangement. The counterweight is mounted on a lever which will oscillate in an opposite direction to the movement of the swivel roller so that the moment of inertias are balanced during operation of the device and the torque on the drive for the rollers is balanced.
In a feeding device for advancing a web into an input of a station which, during a standstill of the web, processes the web, said device including a first drive roller around which a second swivel roller being moved upstream and downstream positions, said swivel roller being mounted by two side levers to pivot on an axle of the drive roller, and having a driving pinion meshing with a drive gear on the axle of the drive roller, and means for moving the swivel roller upstream to form a loop in the web when the web is at a standstill in the station, the improvements comprising a counterweight having a pinion meshing with a toothed gear on the axle of the drive roller, said counterweight being mounted for rotation on a center of rotation on a pivot arm, said pivot arm mounted for pivoting around the axle of the drive roller, and means for oscillating said pivot arm with the counterweight on the axle of the drive roller in a direction opposite to the movement of the swivel roller.
Dependencies are inferred from the claim text.