Abstract: Bobbins containing convoluted webs of sheet material, particularly wrapping material for smokers' products, are transferred from a stack—wherein the axes of the cores of bobbins are vertical—onto the horizontal stub of a receiver in a web processing machine by an apparatus wherein a first set of jaws serves to engage the core of a fresh bobbin from within preparatory to transfer to the receiver and simultaneous pivoting of the first set of jaws through 90°. When the supply of web on the core borne by the stub of the receiver is exhausted, the external surface of the thus exposed core is engaged by a second set of jaws which transport the core to a collecting station or the like. Sheet-like partitions which are disposed between neighboring layers of fresh bobbins in the stack are removed by suction cups which are mounted on a reciprocable pusher together with the jaws of the second set.

Abstract: Bobbins containing convoluted webs of sheet material, particularly wrapping material for smokers' products, are transferred from a stack—wherein the axes of the cores of bobbins are vertical—onto the horizontal stub of a receiver in a web processing machine by an apparatus wherein a first set of jaws serves to engage the core of a fresh bobbin from within preparatory to transfer to the receiver and simultaneous pivoting of the first set of jaws through 90°. When the supply of web on the core borne by the stub of the receiver is exhausted, the external surface of the thus exposed core is engaged by a second set of jaws which transport the core to a collecting station or the like. Sheet-like partitions which are disposed between neighboring layers of fresh bobbins in the stack are removed by suction cups which are mounted on a reciprocable pusher together with the jaws of the second set.

Abstract: A roller conveyor is designed to advance successive stacks of superimposed sheets of paper or the like against an abutment. The lowermost sheets of the stacks tend to slide relative to the sheets above them, and such tendency is counteracted by constructing the roller conveyor in such a way that its major section, which is spaced apart from the abutment, advances the stacks with a first force and the next-following section thereupon advances the stacks with a greater second force. The conveyor has driven shafts which extend transversely of the direction of advancement of the stacks and are surrounded, with play, by ring-shaped or hollow cylindrical rollers which contact the undersides of lowermost sheets of the stacks.