Method to engage and insert sliver into free fibre spinning units and device which employs the method.

摘要

Method to engage and insert sliver into spinning units of machines employing the free fibre spinning system, the spinning units (20) being fed by spinning cans (13) which hold sliver (23) of fibres and which, when emptied, are advantageously, but not only, filled with sliver (23) distributed by a movable unit (11) able to run along the sides of the spinning machines and to carry out the filling of the cans (13) in correspondence with the spinning unit (20) requiring the filling, the engagement and insertion of sliver (23) in the spinning unit (20) being carried out automatically by means comprised in the movable unit (11) when the required quantity of sliver (23) has been deposited in the spinning cans (13) and when those cans (13) have been placed in their working position at the respective spinning units (20), the engagement and insertion of the sliver (23) in the spinning unit (20) consisting of the following working steps: - the positioning of a segment of sliver (23), located between a coiler (24) and a spinning can (13), on a vertical plane and horizontal plane, - the clamping of that segment of sliver (23), - the engagement and gripping of the segment of sliver (23) in a zone other than that of the clamping, - breakage of the sliver (23), - the positioning of the end of the sliver (23) thus gripped and broken in correspondence with the intake of a condenser (45) of the spinning unit (20), - introduction of the end of the sliver (23) in the intake of the condenser (45) and the substantially simultaneous introduction of air under pressure downstream of the intake of the condenser (45) , - the release of the end of the sliver (23) from the position at which it has been gripped, - aspiration and thrusting of the end of the sliver (23) into the spinning unit (20), - repositioning of all the working means during an inactive phase, and - restarting of the spinning process on the spinning unit (20) thus operated. Device to engage and insert sliver (23) into spinning units (20), which employs the above method and comprises the following mutually cooperating assemblies: - an assembly (22) to position a segment of sliver (23) on a vertical plane and a horizontal plane, which assembly is positioned in a space in a movable unit (11), - an assembly-holder support (25) able to move on a horizontal plane in the movable unit (11), - an element (40) to clamp the sliver (23), - a means (27) to manipulate the sliver (23), with grippers (28) to engage the sliver (23), - an assembly (31) to inject air under pressure into a condenser (45) of the spinning unit (20), this injection assembly (31) being equipped with an air ejector (32), - means to actuate the above devices, and - control and consent means (39-41-43-47) for the various steps of the cycle to engage and insert the sliver (23).