Abstract: Apparatus for the extrusion-based manufacture of at least one three-dimensional object, comprising at least one extrusion unit which is configured for melting an extrusion material and/or for applying a molten extrusion material to a substrate, comprising a device which is configured to detect parameter information relating to a process parameter of an extrusion-based manufacturing process which can be carried out or is carried out by means of the apparatus and/or to an object parameter of a three-dimensional object which is to be produced or is produced by means of the apparatus, and to generate position information and/or time information describing a detection position and/or a detection time of corresponding parameter information.

Abstract: An apparatus and a method for improving at least one physical property of an extruded plastic material comprise an extruder for extruding the plastic material as well as a laser unit with at least one laser for irradiating the extruded plastic material with laser light. Further, the apparatus has at least one laser light-reflecting reflector arranged at a distance to the extruded plastic material. The laser and the reflector are arranged and designed such that the laser light emitted by the laser is incident on the reflector through the extruded plastic material, the reflector reflects the incident laser light such that at least a part of the reflected laser light hits the extruded plastic material.

Abstract: What is described is a twin screw extruder having two extruder screws (10, 34), each extruder screw (10) having a cylindrical core (12) and at least one web (14) running helically over the periphery of the outer cylinder face of the core (12), the surface of the web (14) comprising a peripheral side (18) and two flanks (22, 24), and a channel (30) being formed between adjacent web windings. The flanks (22, 24) of the web (14) have a waved progression in the peripheral direction.

Abstract: In a continuous grinding machine for grinding the surface of flat workpieces (20) with at least one grinding station and a transport device (10) for moving the workpieces (20) relative to the grinding station, the grinding station having at least one grinding assembly (22) with a grinding belt (26) and a pressure device (34) for pressing the grinding belt (26) against the workpiece surface, and with a control device (38) for controlling the pressure device (34) depending on the workpiece contour, the transport device (10) is reversible with respect to its feed direction and the control device (38) has means (36) for detecting the workpiece contour depending on the feed direction.

Abstract: What is described is a twin screw extruder having two extruder screws (10, 34), each extruder screw (10) having a cylindrical core (12) and at least one web (14) running helically over the periphery of the outer cylinder face of the core (12), the surface of the web (14) comprising a peripheral side (18) and two flanks (22, 24), and a channel (30) being formed between adjacent web windings. The flanks (22, 24) of the web (14) have a waved progression in the peripheral direction.

Abstract: A grinding machine includes a machine frame with a work piece support surface on which a work piece may be transporter through the machine. A grinding bar arrangement including two grinding shoes positioned in parallel is arranged transversely with respect to a work piece feeding direction across the width of the work piece support surface. The two grinding shoes carry a grinding medium on their surfaces facing the work piece support surface and are suspended via an eccentric drive. The two grinding shoes perform rotary movements in a plane parallel to the work piece support surface achieving a high quality grinding result.

Abstract: In a continuous grinding machine for grinding the surface of flat workpieces (20) with at least one grinding station and a transport device (10) for moving the workpieces (20) relative to the grinding station, the grinding station having at least one grinding assembly (22) with a grinding belt (26) and a pressure device (34) for pressing the grinding belt (26) against the workpiece surface, and with a control device (38) for controlling the pressure device (34) depending on the workpiece contour, the transport device (10) is reversible with respect to its feed direction and the control device (38) has means (36) for detecting the workpiece contour depending on the feed direction.

Abstract: A grinding machine includes a machine frame with a work piece support surface on which a work piece may be transporter through the machine. A grinding bar arrangement including two grinding shoes positioned in parallel is arranged transversely with respect to a work piece feeding direction across the width of the work piece support surface. The two grinding shoes carry a grinding medium on their surfaces facing the work piece support surface and are suspended via an eccentric drive. The two grinding shoes perform rotary movements in a plane parallel to the work piece support surface achieving a high quality grinding result.

Abstract: In a machine for processing the edges and outer surfaces of flat workpieces, including a machine frame with a workpiece support surface 12 and at least one dressing head 14 with a work tool carrier, which work tool carrier is rotatably supported on the machine frame for rotation about a first axis perpendicular to the workpiece support surface 12 and is driven by a drive, and which work tool carrier carries at least two work tools 32 rotatably supported eccentrically to the first axis on the work tool carrier each for rotation about a second axis perpendicular to the workpiece support surface 12, and each of which tools is connected with a planet gear 44 which stands in meshing drive engagement with a sun gear 26 coaxial to the first axis so that each circulating work tool carrier defines an effective circle 46 of its work tools 32, with at least two dressing heads 14 being so arranged next to one another that the effective circles 46 of their work tools 32 overlap, with the movement of the work tool carriers

Abstract: An elongated bar shaped housing contains an optical sensing apparatus with at least one light source to create a sensing beam and a deflecting arrangement which moves the sensing beam back and forth between the longitudinal ends of the housing. One of the walls of the housing has an output window extending in the longitudinal direction of the housing for the sensing beam and an input window parallel to the output window for the sensing beam reflected from a workpiece or its support. In the housing behind the input window there is a strip shaped light receiving arrangement with a plurality of optical sensors, as well as an evaluation unit connected to the light receiving arrangement to which the output signals of the light receiving arrangement are sent.

Abstract: In a machine for processing the edges and outer surfaces of flat workpieces, including a machine frame with a workpiece support surface 12 and at least one dressing head 14 with a work tool carrier, which work tool carrier is rotatably supported on the machine frame for rotation about a first axis perpendicular to the workpiece support surface 12 and is driven by a drive, and which work tool carrier carries at least two work tools 32 rotatably supported eccentrically to the first axis on the work tool carrier each for rotation about a second axis perpendicular to the workpiece support surface 12, and each of which tools is connected with a planet gear 44 which stands in meshing drive engagement with a sun gear 26 coaxial to the first axis so that each circulating work tool carrier defines an effective circle 46 of its work tools 32, with at least two dressing heads 14 being so arranged next to one another that the effective circles 46 of their work tools 32 overlap, with the movement of the work tool carriers

Abstract: An elongated bar shaped housing contains an optical sensing apparatus with at least one light source to create a sensing beam and a deflecting arrangement which moves the sensing beam back and forth between the longitudinal ends of the housing. One of the walls of the housing has an output window extending in the longitudinal direction of the housing for the sensing beam and an input window parallel to the output window for the sensing beam reflected from a workpiece or its support. In the housing behind the input window there is a strip shaped light receiving arrangement with a plurality of optical sensors, as well as an evaluation unit connected to the light receiving arrangement to which the output signals of the light receiving arrangement are sent.

Abstract: An elongated bar shaped housing contains an optical sensing apparatus with at least one light source to create a sensing beam and a deflecting arrangement which moves the sensing beam back and forth between the longitudinal ends of the housing. One of the walls of the housing has an output window extending in the longitudinal direction of the housing for the sensing beam and an input window parallel to the output window for the sensing beam reflected from a workpiece or its support. In the housing behind the input window there is a strip shaped light receiving arrangement with a plurality of optical sensors, as well as an evaluation unit connected to the light receiving arrangement to which the output signals of the light receiving arrangement are sent.

Abstract: The invention concerns a belt grinding machine contact roll with a steel core and a sleeve surrounding the core. The sleeve includes an intermediate layer of elastically yieldable material, covering at least a portion of the steel core, and closed rings of a hard material surrounding the elastic intermediate layer, which rings are axially arranged next to one another along the core axis and are axially separated from one another by ring grooves.