A device for removing powdery particles of a machine for filling a bag and corresponding machine and method

A method for removing powdery particles of a machine for filling a bag with a product comprising at least powdery particles, wherein the method comprises the steps of:

• [a] providing a supply duct extending along a longitudinal direction between an inlet end and an outlet end and defining an inner volume, said supply duct being configured for receiving a filling mouth of said bag at said outlet end in a fitted manner,
• [b] said supply duct further comprising between said first and second ends at least
• [bi] a first bellows section and
• [bii] an elastically deformable second section,
• further providing:
• [c] closing means, arranged to deform said second section,
• [d] at least one first linear actuator arranged to deform said first bellows section in length along said longitudinal direction and to functionally cooperate with said closing means, and
• [e] suction means arranged in fluid communication with said inner volume of said supply duct,
• the method further comprising the steps of
• [f] placing said filling mouth of said bag at said outlet end in a fitted manner,
• [g] moving said closing means into an open position,
• [h] filling up the bag with said product,
• [i] moving said closing means at least into a first closing position, in which said closing means compress said second section to reduce the inner cross section of said second section,
• [j] compensating with said first linear actuator at least a variation in length in the longitudinal direction of said second section, when said closing means move between said open and said first closing positions,
• [k] operating said suction means for removing said powdery particles contained in said inner volume at least when said closing means are in said first closing position.