Abstract: An automatic test device (10) for testing automatic screwdrivers (12) in a robotic station (10) for tightening elements (18) of an object (17) handled in the station comprises a frame (20) suitable for being inserted in a station in place of an object handled in the station; a plurality of screwdriver test heads (21) arranged on the frame (20); a control unit (24) connected to the test head (21) in order to control operation of the test heads (21) and detect tightening parameters of screwdrivers applied to the test heads (21) by the robotic station. A plant with at least one robotic station (10), a transport line (15) and an automatic test device (10) is also described. Finally, a method for testing automatic screwdrivers in robotic stations is described.

Abstract: An electronic torque wrench (10) comprises a body with an axial extension along a longitudinal axis (11), a front end provided with a coupling (14) intended to engage the wrench on a joint to be tightened by manual rotation around a rotation axis (15) which is transverse to the longitudinal axis (11), and a handle (13) along the body for operating the wrench. A sensor (16) is intended to detect a torque applied with the wrench to the coupling (14) and comprises two flex sensor elements (16a and 16b) which are arranged spaced apart along the longitudinal axis (11).

Abstract: An electronic torque wrench (10) comprises a body with an axial extension along a longitudinal axis; a front end provided with a coupling (14) intended to engage the wrench on a joint to be tightened by manual rotation around a rotation axis (15) which is transverse to the longitudinal axis (11); a handle (13) along the body for operating the wrench; and a sensor (16) for detecting a torque applied with the wrench to the coupling (14) and comprising two flex sensor elements (16a and 16b) which are arranged spaced apart along the longitudinal axis (11). An electronic control circuit (17) is connected to the sensor (16) for receiving signals from it and applying a method which comprises the steps of calculating, depending on the flexing values detected by the two sensor elements (16a and 16b), whether the flexing value detected by the sensor element closest to the front end is less than the flexing value detected by the sensor element farthest from the end front; and, if so, emitting an error signal.

Abstract: Within a test bench for screwdrivers, comprising a braking unit (11) with a brake (14) equipped with a fitting (12) for a screwdriver to be tested and transducers (15) for the measurement of angle and torque, a method for controlling the brake (14) can include a step wherein a starting Cstart torque value other than zero is set and the torque/angle curve (17) is followed starting from such Cstart value, during a screwdriver test. The method can also comprise a step wherein movement along the torque/angle curve (17) is controlled in a bidirectional manner, in the sense that the brake is controlled according to a curve whose torque values are based on the angle during both decremental progression of the angle and incremental progression of the angle.

Abstract: Within a test bench for screwdrivers, comprising a braking unit (11) with a brake (14) equipped with a fitting (12) for a screwdriver to be tested and transducers (15) for the measurement of angle and torque, a method for controlling the brake (14) comprises a step wherein movement along a torque/angle curve (17) is controlled in a bidirectional manner, in the sense that the brake is controlled according to a curve whose torque values are based on the angle during both decremental progression of the angle and incremental progression of the angle. The method can also comprise a step consisting of setting a starting Cstart torque value other than zero and following the torque/angle curve (17) from the said Cstart value during a screwdriver test.

Abstract: Within a test bench for screwdrivers, comprising a braking unit (11) with a brake (14) equipped with a fitting (12) for a screwdriver to be tested and transducers (15) for the measurement of angle and torque, a method for controlling the brake (14) comprises a step wherein movement along a torque/angle curve (17) is controlled in a bidirectional manner, in the sense that the brake is controlled according to a curve whose torque values are based on the angle during both decremental progression of the angle and incremental progression of the angle. The method can also comprise a step consisting of setting a starting Cstart torque value other than zero and following the torque/angle curve (17) from the said Cstart value during a screwdriver test.

Abstract: Within a test bench for screwdrivers, comprising a braking unit (11) with a brake (14) equipped with a fitting (12) for a screwdriver to be tested and transducers (15) for the measurement of angle and torque, a method for controlling the brake (14) can include a step wherein a starting Cstart torque value other than zero is set and the torque/angle curve (17) is followed starting from such Cstart value, during a screwdriver test. The method can also comprise a step wherein movement along the torque/angle curve (17) is controlled in a bidirectional manner, in the sense that the brake is controlled according to a curve whose torque values are based on the angle during both decremental progression of the angle and incremental progression of the angle.