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A device for continuously filtering material mixtures, particularly for separating contaminants out of plastic melts, includes a filter (3), which is rotatably arranged in a filter chamber (2) of a housing (1), at least one wiper (17) for lifting off contaminants retained by the filter (3), and a di

A device for continuously filtering material mixtures, particularly for separating contaminants out of plastic melts, includes a filter (3), which is rotatably arranged in a filter chamber (2) of a housing (1), at least one wiper (17) for lifting off contaminants retained by the filter (3), and a discharge device (18) for removing the contaminants lifted off the filter (2) by the wiper (17) from the housing (1). The discharge device (18) includes a discharge shaft (19), which is rotatably arranged at the housing (1) and which has at least one continuous opening (20) having at least one piston (22) which is movably guided therein.

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1. A device for the continuous filtering of material mixtures, for separating impurities from plastic melts, the device comprising: a housing with a filter space and a feed opening;a carrier shaft in the filter space;a filter connected to the carrier shaft and arranged rotatably in the filter space

1. A device for the continuous filtering of material mixtures, for separating impurities from plastic melts, the device comprising: a housing with a filter space and a feed opening;a carrier shaft in the filter space;a filter connected to the carrier shaft and arranged rotatably in the filter space of the housing, the carrier shaft being rotatably driven for rotating the filter in the filter space;a stripper supported relative to the housing in contact with the filter for lifting off the impurities retained by the filter; anda discharge means for removing the impurities lifted off by the stripper from the filter from the housing, wherein the discharge means comprises a piston having a piston first end and a piston second end and a discharge shaft, the discharge shaft being arranged rotatably at the housing, the discharge shaft having at least one continuous opening having an opening length with an opening length extent continuing through the discharge shaft from a shaft first outer surface portion to a shaft second outer surface portion, the piston having a length, from the piston first end to the piston second end, that is shorter than the opening length and the piston being guided displaceably in said opening between a position with the piston first end adjacent to the shaft first outer surface portion and an opposite position with the piston second end adjacent to the shaft second outer surface portion, whereby the discharge shaft is rotated such that the discharge shaft first outer surface portion faces accumulating impurities lifted off by the stripper and a first side receiving space is provided, within the opening from the piston first end to the shaft first outer surface portion, facing the accumulating impurities and upon the shaft being further rotated, the shaft second outer surface portion faces accumulating impurities lifted off by the stripper and the piston moves toward the shaft first outer surface portion to push impurities out of the first side receiving space and a second side receiving space is provided, within the opening from the second piston end to the shaft second outer surface portion, facing the accumulating impurities. 2. A device in accordance with claim 1, wherein the piston is guided displaceably in the opening at right angles to the axis of rotation of the discharge shaft. 3. A device in accordance with claim 1, wherein the piston is guided displaceably in the opening in the direction of the axis of rotation of the discharge shaft. 4. A device in accordance with claim 1, wherein: the piston comprises a pusher piston; andthe opening is a continuous slot, in which the pusher piston is arranged. 5. A device in accordance with claim 1, wherein: the piston comprises a plurality of pusher pistonsthe opening is a continuous slot, in which the plurality of pusher pistons are arranged. 6. A device in accordance with claim 1, wherein a plurality of slot-like openings separated from one another with a pusher-like piston each arranged therein are provided in the discharge shaft. 7. A device in accordance with claim 1, wherein a plurality of round openings separated from one another with a round piston each arranged therein are provided in the discharge shaft. 8. A device in accordance with claim 6, wherein the openings are oriented in the same direction or are angularly offset in the circumferential direction. 9. A device in accordance with claim 1, wherein the discharge shaft is arranged in a longitudinal hole of the housing, which said hole is open towards the filter space, such that a part of the discharge shaft extends through a recess of the housing, which said recess is open towards the filter space. 10. A device in accordance with claim 9, wherein the housing has a discharge opening provided for the discharge of the impurities removed by the discharge means on the side of the housing located opposite the recess. 11. A device in accordance with claim 10, wherein: the discharge opening is arranged at an angle offset in relation to a central axis of the recess, which is open towards the filter space; andthe continuous opening opens during the rotation of the discharge shaft towards the discharge opening only when the opening is already fully open at the recess, which is open towards the filter space. 12. A device in accordance with claim 1, wherein the piston has a smaller width when viewed in the direction of displacement than the diameter of the discharge shaft. 13. A device in accordance with claim 1, wherein the carrier shaft contains a drive pin mounted rotatably in a bore of the housing and the device further comprises: a mounting part arranged in the filter space for mounting the filter;a bearing cap; anda bearing journal mounted in a bore of the bearing cap. 14. A device in accordance with claim 13, wherein the carrier shaft contains a plurality of collection slots for receiving filtered material. 15. A device in accordance with claim 14, wherein the collection slots lead to a collection channel, via which the filtered material is removed through a radial opening. 16. A device in accordance with claim 1, wherein the filter is designed in the form of a tube attached to the carrier shaft. 17. A device in accordance with claim 1, wherein the speed of the carrier shaft with the filter arranged thereon and the speed of the discharge shaft can be controlled separately. 18. A plastic melts continuous filtering device comprising: a housing with a filter space and feed opening;a carrier shaft in the filter space, the carrier shaft having a drive pin;a filter arranged rotatably on the carrier shaft in the filter space of the housing;a stripper supported relative to the housing in contact with the filter for lifting off impurities retained by the filter; anda discharge arrangement for removing impurities lifted off by the stripper from the filter from the housing, the discharge arrangement comprising a piston having a piston first end and a piston second end and a discharge shaft, the discharge shaft being arranged rotatably relative to the housing and being driven in rotation, and the discharge shaft having an opening continuing through the discharge shaft from a shaft first outer surface portion to a shaft second outer surface portion, the opening having an opening extent from the shaft first outer surface portion to the shaft second outer surface portion, the piston having a length that is shorter than the opening extent and the piston being guided displaceably within the opening, along at least a portion of the opening extent, toward the shaft first outer surface portion to a position with the piston first end adjacent to the shaft first outer surface portion and away from the shaft first outer surface portion and being guided displaceably within the opening, along at least a portion of the opening extent, toward the shaft second outer surface portion to a position with the piston second end adjacent to the shaft second outer surface portion and away from the shaft second outer surface portion, whereby the shaft is rotated such that the shaft first outer surface portion faces accumulating impurities lifted off by the stripper and a first side receiving space is provided within the opening from a piston first end to the shaft first outer surface portion facing the accumulating impurities and upon the shaft being further rotated, the shaft second outer surface portion faces accumulating impurities lifted off by the stripper and the piston moves toward the shaft first outer surface portion to push impurities out of the first side receiving space and a second side receiving space is provided within the opening from a second piston end to the shaft second outer surface portion facing the accumulating impurities. 19. A device in accordance with claim 18, further comprising: a bearing cap; anda bearing journal connected to the carrier shaft and mounted in a bore of the bearing cap, wherein:the drive pin is mounted rotatably in a bore of the housing and the bearing journal is mounted in a bore of the bearing cap;the carrier shaft comprises a plurality of collection slots for receiving filtered material; andthe collection slots lead to a collection channel, via which the filtered material is removed through a radial opening, wherein:the piston comprises a pusher piston; andthe opening comprises a continuous slot, in which the pusher piston is arranged. 20. A device in accordance with claim 1, wherein the discharge shaft arranged rotatably at the housing is driven in rotation by a drive and the carrier shaft is driven in rotation by a different drive whereby the rotation of the discharge shaft and the rotation of the carrier shaft are driven and regulated by different drives. 21. A device in accordance with claim 1, wherein a material mixture is pressed via the feed opening of the housing into the filter space under pressure and is pressed radially outwardly by the internal pressure in the filter space and impurities located in an area of the stripper are pressed into the first side receiving space or the second side receiving space, which first side receiving space or the second side receiving space is adjacent to the stripper.