Abstract: The invention relates to a method for controlling a current fed to an electric motor during an operation to mount a tire on a rim of a wheel including the tire and the rim, or to demount the tire from the rim. The wheel is rotated by an electric motor about an axis, and the motor current fed to the electric motor is controlled dependent on the rotational speed and torque required for the mounting and/or demounting operation. The motor current is automatically changed to cause the electric motor to apply a high torque peak to rotate the wheel, when the motor current is measured to be greater than a preset limit at a low rotational speed during a preset time. Furthermore, the invention relates to an apparatus for mounting a tire on a rim or demounting the tire from the rim.

Abstract: The invention relates to a method for mounting a tyre on a rim or demounting a tyre from a rim, wherein the wheel (tyre/rim assembly) is rotated by an electric motor (12) about an axis (A), wherein the motor current fed to the electric motor (12) is controlled dependent on the rotational speed and torque required for the mounting and/or demounting operation, and wherein the motor current is automatically changed to apply a high torque peak, when the measured motor current is greater than a preset limit at a low rotational speed during a preset time.

Abstract: In a process for reading fractions of an interval between contiguous photo-sensitive elements in a linear optical sensor, of a type used in a goniometer, an angle measured is an angle formed with a reference axis of the goniometer, perpendicular to the linear optical sensor, by a light beam which is trained on the optical sensor by an optical device. The process comprises: a reading of a current image constituted by an order totality of intensities of incident radiations read on contiguous photosensitive elements; processing of data taken from the current image by means of a process which converges towards a result defining, with respect to an origin determined by an intersection of the reference axis with an axis of the sensor, a distance d of a point of incidence on the sensor of an ideal optical axis of the light beam.

Abstract: The process of the invention can be used for measuring angles characteristic of wheels of a motor vehicle, in which a light signal is produced by a light beam having a predetermined direction with respect to which an angle to be measured is measured, the angle being formed between the direction of the light beam and a reference axis of the goniometer which reference axis is perpendicular to the linear optical sensor. The linear optical sensor is constituted by a plurality of contiguous and aligned photo-sensitive elements, by means of which elements an image of the light signal can be read. The image is constituted by an ordered totality of intensities of incident radiations recorded on the photo-sensitive elements. Measurement of the angle is a direct function of a distance of the image from an origin for measurement of distances in longitudinal direction, which is defined by an intersection of the reference axis with a longitudinal axis of the sensor.

Abstract: In a process for reading fractions of an interval between contiguous photo-sensitive elements in a linear optical sensor, of a type used in a goniometer, an angle measured is an angle formed with a reference axis of the goniometer, perpendicular to the linear optical sensor, by a light beam which is trained on the optical sensor by an optical device. The process comprises: a reading of a current image constituted by an ordered totality of intensities of incident radiations read on contiguous photosensitive elements; processing of data taken from the current image by means of a process which converges towards a result defining, with respect to an original determined by an intersection of the reference axis with an axis of the sensor, a distance d f a point of incidence on the sensor of an ideal optical axis of the light beam.

Abstract: In a process for reading fractions of an interval between contiguous photo-sensitive elements in a linear optical sensor, of a type used in a goniometer, an angle measured is an angle formed with a reference axis of the goniometer, perpendicular to the linear optical sensor, by a light beam which is trained on the optical sensor by an optical device. The process comprises: a reading of a current image constituted by an ordered totality of intensities of incident radiations read on contiguous photosensitive elements; processing of data taken from the current image by means of a process which converges towards a result defining, with respect to an original determined by an intersection of the reference axis with an axis of the sensor, a distance d f a point of incidence on the sensor of an ideal optical axis of the light beam.

Abstract: The process of the invention can be used for measuring angles characteristic of wheels of a motor vehicle, in which a light signal is produced by a light beam having a predetermined direction with respect to which an angle to be measured is measured, the angle being formed between the direction of the light beam and a reference axis of the goniometer which reference axis is perpendicular to the linear optical sensor. The linear optical sensor is constituted by a plurality of contiguous and aligned photo-sensitive elements, by means of which elements an image of the light signal can be read. The image is constituted by an ordered totality of intensities of incident radiations recorded on the photo-sensitive elements. Measurement of the angle is a direct function of a distance of the image from an origin for measurement of distances in longitudinal direction, which is defined by an intersection of the reference axis with a longitudinal axis of the sensor.