An automatic sampling system for taking samples from a rubber strip after it has been shaped and while it is moving in a predetermined direction, the system comprising: an anvil comprising a cylinder of a predetermined diameter and with a circumferential surface that engages the rubber strip during its movement, the anvil being fixed so that it is rotatable about an axis of rotation; and a punch with a cylindrical housing of a predetermined length extending between a sampling end and an opposite installation end (106a"), the punch comprising: a die-cutter provided at the sampling end for perforating the rubber strip and for obtaining samples of the rubber strip during its movement, the punch having an annular blade of a predetermined diameter; a fastening and support member provided at the installation end to carry out installation of the punch with respect to a drive shaft to which the punch is rotatably attached, the punch rotating in the same direction as the movement of the rubber strip; an ejector disposed within the housing that moves along a common longitudinal axis among the ejector, the housing and the die-cutter, the ejector comprising a structure with a predetermined length that extends between a release end and an opposite attachment end (114a"), and the attachment end comprising a fastener; and a rod cylinder constituting a piston with a rod and a chamber in which the piston slides, the rod cylinder comprising a fastening device for connecting the piston and the ejector so that the movement of the piston in the chamber upon supply of a pressurized fluid effects corresponding movement of the ejector between a standby position and a release position, characterized in that the release end comprising a domed surface that facilitates release of the sample. an anvil comprising a cylinder of a predetermined diameter and with a circumferential surface that engages the rubber strip during its movement, the anvil being fixed so that it is rotatable about an axis of rotation; and a punch with a cylindrical housing of a predetermined length extending between a sampling end and an opposite installation end (106a"), the punch comprising: a die-cutter provided at the sampling end for perforating the rubber strip and for obtaining samples of the rubber strip during its movement, the punch having an annular blade of a predetermined diameter; a fastening and support member provided at the installation end to carry out installation of the punch with respect to a drive shaft to which the punch is rotatably attached, the punch rotating in the same direction as the movement of the rubber strip; an ejector disposed within the housing that moves along a common longitudinal axis among the ejector, the housing and the die-cutter, the ejector comprising a structure with a predetermined length that extends between a release end and an opposite attachment end (114a"), and the attachment end comprising a fastener; and a rod cylinder constituting a piston with a rod and a chamber in which the piston slides, the rod cylinder comprising a fastening device for connecting the piston and the ejector so that the movement of the piston in the chamber upon supply of a pressurized fluid effects corresponding movement of the ejector between a standby position and a release position, characterized in that the release end comprising a domed surface that facilitates release of the sample. a die-cutter provided at the sampling end for perforating the rubber strip and for obtaining samples of the rubber strip during its movement, the punch having an annular blade of a predetermined diameter; a fastening and support member provided at the installation end to carry out installation of the punch with respect to a drive shaft to which the punch is rotatably attached, the punch rotating in the same direction as the movement of the rubber strip; an ejector disposed within the housing that moves along a common longitudinal axis among the ejector, the housing and the die-cutter, the ejector comprising a structure with a predetermined length that extends between a release end and an opposite attachment end (114a"), and the attachment end comprising a fastener; and a rod cylinder constituting a piston with a rod and a chamber in which the piston slides, the rod cylinder comprising a fastening device for connecting the piston and the ejector so that the movement of the piston in the chamber upon supply of a pressurized fluid effects corresponding movement of the ejector between a standby position and a release position, characterized in that the release end comprising a domed surface that facilitates release of the sample.