Savio S.p.a

Sergio Montali

Luigi Colli

Giorgio Boller

Francesco Ferro

This invention relates to a device for regulating the winding speed in the formation of cross-wound conical bobbins where the yarn is withdrawn at constant speed from a rotor spinning unit by a lever system able to displace the friction drive band of the drive roller for the conical bobbin under formation, in order to vary the average resultant value of the varying winding speed during each double stroke of the yarn guide element. Said lever system is operated by a two-direction rotary drive source which is activated when a linear position element, associated rigidly with the yarn storage element, senses by known means that abnormal storage swings persist.

Device for regulating the yarn winding speed in the formation of conical

A yarn storage and return device for yarn being wound on a conical bobbin driven at a constant speed. The device comprises a lever system for storing and returning the yarn and for regulating and monitoring the amount of stored yarn. The yarn is drawn into the storage position by an arm of the lever system and is then released (i.e. returned) from this storage position. This returning operation releases the yarn from its storage position and replaces it (returns it), to its normal feed path. The device also comprises a yarn tension measurer, an electric comparator, and an electric control unit to measure and compare the yarn tension, and to process an electric controlling signal to activate a drive motor. The drive motor actuates a tensioning element which affects the storage operation of the device.

Device and method for intermittently storing and returning yarn during

A yarn storage and return device for yarn being wound on a conical bobbin driven at a constant speed. The device comprises a lever system for speed. The device comprises a lever system for storing and returning the yarn and for regulating and monitoring the amount of stored yarn. The yarn is drawn into the storage position by an arm of the lever system and is then released (i.e. returned) from this storage position. This returning operation releases the yarn from its storage position and replaces it (returns it) to its normal feed path. The device also comprises a transducer, and electric comparator, and an electric processor control unit to convert, compare and process an electrtic controlling signal to activate a drive source. The drive motor actuates a tensioning element which affects the storage operation of the device. The device further comprises a bidirectional drive unit to obtain a variation in the average yarn winding speed to restore the storage operation to a predetermined range of values.

A yarn storage and return device for yarn being wound on a conical bobbin driven at a constant speed. The device comprises a lever system for storing and returning the yarn and for regulating and monitoring the amount of stored yarn. The yarn is drawn into the storage position by an arm of the lever system and is then released (i.e. returned) from this storage position. This returning operation releases the yarn from its storage position and replaces it (returns it), to its normal feed path. The device also comprises a transducer, and electric comparator, and an electronic processor control unit to convert, compare, and process an electric controlling signal to activate a drive motor. The drive motor actuates a tensioning element which affects the storage operation of the device.

A device and method for winding conical bobbins with yarn withdrawn at constant speed from individual spinning units, and comprising: a deflecting roller, or similar element, which is connected to and moved backwards and forwards by a swinging plate element which by storing and returning the yarn compensates for the different speeds at which the yarn is collected on the conical surface of the bobbin under formation wherein yarn is drawn into the storage position and is then released from this storage position, (i.e. returned). This returning operation releases the yarn from its storage position and replaces it (returns it), to its normal feed path; two proximity sensors positioned to define the regular range of swing of the flat yarn storage and return element; an electronic control unit which receives an electrical signal or several electrical signals provided by the proximity sensors when the yarn storage and return swings stray outside the regular range in order to generate, when said signals occur, an electrical control signal which activates a bidirectional drive unit; a bidirectional drive unit which inclines the conical bobbin axis, so displacing the diameter of effective contact between the conical bobbin and the drive roller, in order to vary the yarn winding speed and so return the storage swing to within the range of values corresponding to regular storage.

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Roveredo in Piano, Italy

Sergio Montali