Intake system for an open-end type rotor spinning machine, a ring type spinning machine, an air-jet type spinning machine or a cone-winding machine, comprising - at least one suction fan to create, by means of a negative pressure, an air intake flow containing spinning and/or winding waste, such as dust, lint and the like, - at least one filtration device for collecting said waste, fluidically connected to said suction fan, through at least one intake duct, and fluidically connectable to at least one waste feed duct of at least one spinning and or/cone-winding unit, in correspondence of a feed mouth, - the filtration device being suitable to perform the continuous separation of the waste from the air intake flow, and being provided with at least one outlet mouth for the disposal of said waste, - wherein, in correspondence of said outlet mouth, the intake system comprises sealed conveying means suitable to receive the waste from said outlet mouth and to expel it through a discharge, maintaining fluid seal with the outlet mouth, so as to maintain the filtration device for the collection of said waste always under negative pressure, wherein the filtration device comprises a cyclone device that receives in a tangential direction (T-T) a flow of air containing waste and that separates the waste from the flow of air by means of centrifugal action and acting on the waste, wherein said cyclone device comprises a first and a second hopper (104,108) that determine a first and a second separation cyclone of the waste and which are superimposed in series, wherein the first hopper is fluidically connected with the suction fan and the waste feed duct, the second hopper receives the waste separated by the first cyclone and is provided with said outlet mouth connected to the sealed conveying means. - at least one suction fan to create, by means of a negative pressure, an air intake flow containing spinning and/or winding waste, such as dust, lint and the like, - at least one filtration device for collecting said waste, fluidically connected to said suction fan, through at least one intake duct, and fluidically connectable to at least one waste feed duct of at least one spinning and or/cone-winding unit, in correspondence of a feed mouth, - the filtration device being suitable to perform the continuous separation of the waste from the air intake flow, and being provided with at least one outlet mouth for the disposal of said waste, - wherein, in correspondence of said outlet mouth, the intake system comprises sealed conveying means suitable to receive the waste from said outlet mouth and to expel it through a discharge, maintaining fluid seal with the outlet mouth, so as to maintain the filtration device for the collection of said waste always under negative pressure, wherein the filtration device comprises a cyclone device that receives in a tangential direction (T-T) a flow of air containing waste and that separates the waste from the flow of air by means of centrifugal action and acting on the waste, wherein said cyclone device comprises a first and a second hopper (104,108) that determine a first and a second separation cyclone of the waste and which are superimposed in series, wherein the first hopper is fluidically connected with the suction fan and the waste feed duct, the second hopper receives the waste separated by the first cyclone and is provided with said outlet mouth connected to the sealed conveying means. wherein the filtration device comprises a cyclone device that receives in a tangential direction (T-T) a flow of air containing waste and that separates the waste from the flow of air by means of centrifugal action and acting on the waste, wherein said cyclone device comprises a first and a second hopper (104,108) that determine a first and a second separation cyclone of the waste and which are superimposed in series, wherein the first hopper is fluidically connected with the suction fan and the waste feed duct, the second hopper receives the waste separated by the first cyclone and is provided with said outlet mouth connected to the sealed conveying means.