Drive mechanism including floating pressure ring for ink ribbon cassette
AssigneeFranz Buttner AG
InventorMarkus Burgin
Life of this patent
Estimating the term…
Abstract
An improved drive mechanism for an ink ribbon cassette for advancing an ink ribbon particularly well suited for use in a typewriter is provided. The drive mechanism includes a drive roller rotatably supported in the casing with a free floating pressure ring supported by a roller. The pressure ring is supported against the roller and against the drive roller so that there is an increase in pressure with an increase in the tension of the ribbon.
Claims13
In an ink ribbon cassette having a top, a bottom, a side wall connecting the top and bottom and an ink ribbon supply means, an improved ink ribbon drive mechanism comprising:
- a rotatably supported driver;
- a freely rotating roller mounted within the cassette adjacent to the driver;
- and
- a pressure ring having an internal diameter larger than the external diameter of the roller mounted about the roller with a portion of the inner surface of the ring contacting the roller and a portion of the outside surface of the ring contacting the driver, the pressure ring, the rotating roller and the driver positioned in the housing so that a ribbon fed from the ribbon supply means contacts a portion of each of the pressure ring and driver for advancing the ribbon past the ring and driver with the pressure on the ribbon increasing in response to an increase in tension on the ribbon.
An ink ribbon cassette having a top, a bottom, a side wall connecting the top and bottom in an ink ribbon supply means, an improved ink ribbon winding mechanism comprising:
- a rotatably supported driver;
- a bearing stud mounted within the cassette adjacent to the driver;
- a freely rotating roller mounted for rotation on the bearing stud and formed with a central cylindrical portion and region of reduced diameter at both ends thereof with conically tapered regions between the cylindrical portion and the regions of reduced diameter;
- a pressure ring having an internal diameter larger than the external diameter of the roller mounted about the roller and a portion of the outside surface of the ring contacting the driver, the pressure ring, the rotating roller and the driver positioned in the housing so that a ribbon fed from the ribbon supply means contacts a portion of each of the pressure ring and driver for advancing the ribbon past the ring and driver with the pressure on the ribbon increasing in response to an increase in tension on the ribbon;
- and
- a winding core mounted for rotation within the cassette, the driver formed with a central driver cylindrical region about which an ink ribbon from the supply means is wound and formed with flanges at both ends of the central drive cylindrical region for guiding the ink ribbon about the central drive cylindrical region, the driver being operatively coupled to the winding core for rotating the winding core.
Dependencies are inferred from the claim text.