Imaging system having external drum and method for producing drum

{
  "publication_number": "US6250221B1",
  "country": "US",
  "kind": "B1",
  "title": "Imaging system having external drum and method for producing drum",
  "abstract": "The present invention provides an extruded external drum for an imaging system. The external drum is extruded from a light-weight and strong material such as an aluminum alloy. The external drum includes a thin outer wall, a hollow cylindrical hub, and a plurality of thin radial spokes extending between the cylindrical hub and the outer wall. The present invention provides a stiff external drum having low rotational inertia.",
  "claims": [
    "1. An apparatus comprising: an extruded external drum for an imaging system, the external drum including an outer wall, a hub, and a plurality of radial spokes extending between the hub and the outer wall, the outer wall further including a first section for receiving a clamp for securing a supply of recording media about the external drum, and a second, opposing section, having increased mass, for rotationally balancing the clamp.",
    "2. The apparatus according to claim 1, wherein the external drum is formed from an aluminum alloy.",
    "3. The apparatus according to claim 1, wherein the first section for receiving a clamp comprises a groove in the outer wall.",
    "4. The apparatus according to claim 3, wherein the groove is disposed above one of the radial spokes.",
    "5. The apparatus according to claim 1, wherein the second, opposing section comprises an increased, extruded thickness of the outer wall.",
    "6. The apparatus according to claim 5, wherein the second, opposing section is disposed above one of the radial spokes.",
    "7. An external drum for an imaging system, comprising: an outer wall; a hub; and a plurality of radial spokes extending between the hub and the outer wall, the outer wall including a section for receiving a clamp for securing a supply of recording media about the external drum, and an opposing section, having increased mass, for rotationally balancing the clamp.",
    "8. The external drum according to claim 7, wherein the external drum is extruded from an aluminum alloy.",
    "9. The external drum according to claim 7, wherein the section for receiving a clamp comprises a groove in the outer wall.",
    "10. The external drum according to claim 9, wherein the groove is disposed above one of the radial spokes.",
    "11. The external drum according to claim 7, wherein the opposing section comprises an increased thickness of the outer wall.",
    "12. The external drum according to claim 11, wherein the opposing section is disposed above one of the radial spokes.",
    "13. An imaging system comprising: an external drum for supporting a supply of recording media, the external drum including an outer wall, a hub, and a plurality of radial spokes extending between the hub and the outer wall, the outer wall further including a section for receiving a clamp for securing the recording media about the external drum, and an opposing section, having increased mass, for rotationally balancing the clamp; and a system for recording image data onto the recording media.",
    "14. The imaging system according to claim 13, wherein the external drum is extruded from an aluminum alloy.",
    "15. The imaging system according to claim 13, wherein the section for receiving a clamp comprises a groove in the outer wall.",
    "16. The imaging system according to claim 15, wherein the groove is disposed above one of the radial spokes.",
    "17. The imaging system according to claim 13, wherein the opposing section comprises an increased thickness of the outer wall.",
    "18. The imaging system according to claim 17, wherein the opposing section is disposed above one of the radial spokes.",
    "19. A method for producing an external drum for an imaging system, comprising the steps of: providing a supply of a material; extruding the material through a die to form the external drum, the external drum including an outer wall, a hub, and a plurality of radial spokes extending between the hub and the outer wall; forming a groove for a clamping mechanism in the outer wall; and increasing a mass of the outer wall opposite the groove to rotationally balance the external drum.",
    "20. The method according to claim 19, wherein the material comprises an aluminum alloy.",
    "21. The method according to claim 19, wherein step of increasing the mass includes the step of increasing an extruded thickness of the outer wall."
  ],
  "cpc": [
    "H04N 1/0692",
    "B21C 23/142",
    "H04N 1/06",
    "H04N 1/08",
    "H04N 1/0839",
    "H04N 2201/0446",
    "Y10T 29/49544",
    "Y10T 29/49565"
  ],
  "assignees": [
    "AGFA CORP"
  ],
  "filing_date": "1999-09-14",
  "publication_date": "2001-06-26",
  "grant_date": "2001-06-26",
  "priority_date": "1999-09-14",
  "application_number": "US-39558699-A",
  "family_id": "23563659",
  "citations": [
    "US2378478A",
    "US4453848A",
    "US4778290A",
    "US4856428A",
    "US6154626A"
  ]
}