Rotobaler with a density sensor

A round baler comprising:

• a frame
• a baling chamber, associated with the frame and configured for at least partly forming a bale from crops,
• wherein the baling chamber comprises a first shell and a second shell and is movable between a bale forming configuration, in which the first and the second shell are positioned end to end to define a fixed internal space into which the crops are fed, and a releasing configuration, in which the first and the second shell are spaced apart to allow releasing the bale from the baling chamber,
• wherein the first shell and/or the second shell, give way with respect to the frame under the thrust force exerted by the bale being formed when the baling chamber is in the bale forming configuration;
• a first and a second plurality of rollers associated with the first and the second shell, respectively, to move the crops into the baling chamber to form the bale;
• a releasing actuator, configured to switch the baling chamber between the bale forming configuration and the releasing configuration;
• a control unit, configured to instruct the releasing actuator to switch the baling chamber;
• a detecting unit, configured to detect a thrust signal, representing a pressure of the bale in the baling chamber and to send the thrust signal to the control unit, wherein the control unit is configured to instruct the releasing actuator to switch the baling chamber to the releasing configuration based on the thrust signal, wherein the detecting unit comprises:
• a rigid contact element including a contact end which, when the baling chamber is in the baling configuration, is configured to remain in contact with the first shell or the second shell and rotatably connected to the frame to rotate in response to a movement of the first shell or of the second shell;
• a sensor, configured to detect the thrust signal, which represents an angular position of the contact element.