Cutting device for cutting a strip of unvulcanized rubber

A cutting device for cutting strips of unvulcanized rubber to proper lengths for building a pneumatic tire in particular a radial tire, said device comprising a conveyor on each side of a cutting apparatus working crosswise with respect to said conveyors for cutting a strip of unvulcanized rubber, characterized in that said apparatus for cutting said strip comprises means to vibrate a knife longitudinally to and fro with ultrasonic frequency;

• means to move the knife vibrating longitudinally to and fro along a track crosswise with respect to said strip;
• clamping means for clamping said strip against said conveyors at both sides of the desired cut and stretching the strip between the clamps during cutting, said strip being put back in condition for conveying by the conveyors by releasing the clamps after the strip has been cut to proper length;
• and an intermediate conveyor between said conveyors, said intermediate conveyor being pivotable in order to make room for a cutting beam, said cutting beam being movable upwardly for a retired position into a raised position wherein it pushes a strip of unvulcanized rubber upwardly out of its normal position while cutting the strip, and the cutting beam after the cutting operation being movable downwardly to the retired position to make room for said intermediate conveyor.