Abstract: An adjustable radial flow diffuser for a radial flow compressor includes adjusting elements having diffuser blades. The adjusting elements are arranged in a diffuser annulus uniformly distributed along the diffuser circumference with an angular pitch .delta.. The adjusting elements further are swivellable about an adjusting axis V parallel to the longitudinal axis of the compressor for changing the narrow cross-section between the diffuser blades. The adjusting elements have either a substantially U-shaped or H-shaped cross-section with sector-shaped plates that are mounted on both sides of a blade root to form the legs. The diffuser blade forms the web of the substantially U or H shaped cross-section.

Abstract: An ink ribbon cartridge for use in an office machine includes a housing; a ribbon; a supply reel for storing unused ribbon wound thereon and a take-up reel for storing used ribbon wound thereon, a drive roller rotatably supported in the housing; and an arrangement for resiliently urging the drive roller and the ribbon wound on the take-up reel into a peripheral, torque-transmitting contact with one another. The drive roller is arranged for being drivingly engaged by an advancing mechanism of the office machine when the cartridge is in place, whereby the drive roller imparts a rotation to the take-up reel in a winding direction for pulling the ribbon off the supply reel, for moving the ribbon through a printing station of the office machine and for winding the ribbon on the take-reel. There is further provided a reverse winding arrangement for pulling ribbon off the take-up reel and for winding the ribbon on the supply reel.

Abstract: An apparatus for separating a mixture of heavy particulate material and light particulate material into separate fractions of heavy and light material is disclosed. The mixture is introduced to a first separating means, particularly an air jig, with a vibratory carrier for separating the mixture into a clean light fraction and a heavy fraction, which heavy fraction contains some light material. The heavy fraction is passed to a second separating means, this second separating means being a pneumatic table associated with the vibratory carrier for separating the said heavy fraction into a clean fraction of heavier particles and a mixture of lighter particles with some small heavier particles, which mixture is directed to a conveyor for recycling through the air jig. The apparatus provides for a very clean separation of heavy particulate material and light particulate material at a high throughput rate.

Abstract: A holding device for temporarily holding the free end of a typing or printing ribbon to permit it to be automatically wound around the core of a takeup reel in an automatic ribbon fastening system. The reel has one flange part provided with a threading slit whose width increases toward the outer edge of the flange part from an inwardly located ribbon-gripping portion. The holding device temporarily holds the free end stationary under slight tension so that the ribbon extends across the flange part. As the reel is rotated, the ribbon enters the threading slit and slides radially inwardly until it is gripped by the gripping portion. As the reel continues to rotate, the free end of the ribbon is pulled out of the holding device.