A core box with interchangeable rails for holding a variety of sizes of cores.

A core box with interchangeable rails for holding a variety of sizes of cores.

A rewinding machine is described with a winding cradle defined by three rollers and including a fourth winding roller defining with the first winding roller a cradle in which the web material is pushed by a winding core to the beginning of each winding cycle, to cause severing of the web material without the need for controlled mechanical parts.