Abstract: A mask is described comprising a mask body for covering the nose and mouth of a wearer, and a cushion for sealing against the wearer's face. The cushion depends inwardly from the periphery of the mask body. The mask body and the cushion are formed of an elastomeric material, and the mask body is shaped such that, when the mask is worn by the wearer, the mask body flexes about a median plane.

Abstract: There is disclosed a sheet media processing machine comprising a media inlet to receive sheet media along a feed direction from a first side of the machine and a media outlet to discharge sheet media along a discharge direction towards the first side of the machine. There is a feed mechanism to convey sheet media from the media inlet to the media outlet, and a re-feed prevention element disposed upstream of the media inlet with respect to the feed direction to inhibit recirculation of discharged sheet media along an external recirculation path between the media outlet and the media inlet. The re-feed prevention element is exposed to contact with sheet media and comprises an elastomer. There is also disclosed a feed guide comprising a re-feed prevention element, and a method in which such a feed guide is installed on a sheet media processing machine.

Abstract: There is disclosed a sheet media processing machine comprising a media inlet to receive sheet media along a feed direction from a first side of the machine and a media outlet to discharge sheet media along a discharge direction towards the first side of the machine. There is a feed mechanism to convey sheet media from the media inlet to the media outlet, and a re-feed prevention element disposed upstream of the media inlet with respect to the feed direction to inhibit recirculation of discharged sheet media along an external recirculation path between the media outlet and the media inlet. The re-feed prevention element is exposed to contact with sheet media and comprises an elastomer. There is also disclosed a feed guide comprising a re-feed prevention element, and a method in which such a feed guide is installed on a sheet media processing machine.

Abstract: A media-sheet stacking system for stacking media sheets on a device output tray comprises a kicker to advance a media sheet along the output tray by pushing a trailing edge of the media sheet as it exits the device, and a movable element arranged to face the output tray across a space that receives media sheets exiting the device. A drive mechanism is provided to drive the movable element in the direction of advance of the media sheet along the output tray.

Abstract: A build material cleaning structure (150) for use in an additive manufacturing system. The build material cleaning structure comprises: a tubular portion defining a channel to pneumatically transport a build material; a rotatable head portion located at least in part within the tubular portion and comprising a cleaning element (152) extending away from an open end of the tubular portion; and a rotor assembly located within the tubular portion and mechanically coupled to the rotatable head portion to generate a torque to drive the rotatable head portion in a rotary motion in response to an airflow in the channel; wherein the rotatable head portion is rotatable in a plane that is substantively orthogonal to the airflow in the channel.

Abstract: A build material nozzle structure (202) comprises: an interface surface (208) to interface with a build material container outlet structure (100); and a retaining structure (210) to releasably hold the build material container outlet structure in an engagement position with the interface surface of the build material nozzle structure; wherein the retaining structure comprises one or more retaining elements (210-1, 210-2, 210-3) disposed in the build material nozzle structure to exert an attractive magnetic biasing force on the build material outlet structure to releasably hold the build material container outlet structure in the engagement position with the interface surface of the build material nozzle structure.

Abstract: Example implementations relate to a guard positionable in a 3D printing system to limit a passing of oversized particles of material to downstream of the guard. As an example, a guard comprises a portion aligned with an axis, the axis being parallel to a direction of travel of particles. The guard also comprises a guard member to direct particles away from the axis.

Abstract: A media-sheet stacking system for stacking media sheets on a device output tray comprises a kicker to advance a media sheet along the output tray by pushing a trailing edge of the media sheet as it exits the device, and a movable element arranged to face the output tray across a space that receives media sheets exiting the device. A drive mechanism is provided to drive the movable element in the direction of advance of the media sheet along the output tray.

Abstract: A media-sheet stacking system (10) for stacking media sheets on a device output tray (OT) comprises a kicker (25) to advance a media sheet along the output tray by pushing a trailing edge of the media sheet as it exits the device, and a movable element (32a) arranged to face the output tray across a space that receives media sheets exiting the device. A drive mechanism (33) is provided to drive the movable element in the direction of advance of the media sheet along the output tray.

Abstract: A media-sheet stacking system (10) for stacking media sheets on a device output tray (OT) comprises a kicker (25) to advance a media sheet along the output tray by pushing a trailing edge of the media sheet as it exits the device, and a movable element (32a) arranged to face the output tray across a space that receives media sheets exiting the device. A drive mechanism (33) is provided to drive the movable element in the direction of advance of the media sheet along the output tray.