Machine tool having a workpiece table

{
  "publication_number": "US8746667B2",
  "country": "US",
  "kind": "B2",
  "title": "Machine tool having a workpiece table",
  "abstract": "A machine tool having a machine frame and a workpiece table. It is provided that the workpiece table (5), on one of its sides (14), is held on the machine frame (2) by a holding device (4), the holding device (4) having at least two holding elements (6, 7), which are spaced apart from one another on the said side (14) of the workpiece table (5) and which are disposed at differing height positions (9, 10), such that an upper and a lower holding element (6, 7) is realized, and at least one of the holding elements (6, 7) being equipped with at least one piezo actuator (24) for altering its length and, associated therewith, influencing the position of the workpiece table.",
  "claims": [
    "1. Machine tool comprising a machine frame and a workpiece table, the workpiece table (5) has one side (14) which is held on the machine frame (2) by a holding device (4), the holding device (4) has at least two holding elements (6, 7), which are spaced apart from one another on the one side (14) of the workpiece table (5) and are disposed at differing height positions (9, 10) to define an upper and a lower holding element (6, 7), and at least one of the holding elements (6, 7) is equipped with at least one piezo actuator (24) for altering a length of the at least one of the holding elements (6, 7) and influencing the position of the workpiece table relative to the machine frame.",
    "2. Machine tool comprising a machine frame and a workpiece table, the workpiece table (5) has one side (14) which is held on the machine frame (2) by a holding device (4), the holding device (4) has at least two holding elements (6, 7), which are spaced apart from one another on the one side (14) of the workpiece table (5) and are disposed at differing height positions (9, 10) to define an upper and a lower holding element (6, 7), and at least one of the holding elements (6, 7) is equipped with at least one piezo actuator (24) for altering a length of the at least one of the holding elements (6, 7) and influencing the position of the workpiece table relative to the machine frame, wherein the upper holding element (6) constitutes a fixed bearing and the lower holding element (7) is provided with the piezo actuator (24).",
    "3. Machine tool comprising a machine frame and a workpiece table, the workpiece table (5) has one side (14) which is held on the machine frame (2) by a holding device (4), the holding device (4) has at least two holding elements (6, 7), which are spaced apart from one another on the one side (14) of the workpiece table (5) and are disposed at differing height positions (9, 10) to define an upper and a lower holding element (6, 7), and at least one of the holding elements (6, 7) is equipped with at least one piezo actuator (24) for altering a length of the at least one of the holding elements (6, 7) and influencing the position of the workpiece table relative to the machine frame, wherein the holding elements (6, 7) each has a linear guide (18) extending horizontally and each have a holding member (15), the holding member (15) being guided so as to be movable along the linear guide (18).",
    "4. Machine tool according to claim 3, wherein the piezo actuator (24) is disposed between the linear guide (18) and the machine frame (2) and the holding member (15) is provided with the piezo actuator (24).",
    "5. Machine tool according to claim 3, wherein the linear guide (18) is disposed directly on the machine frame (2).",
    "6. Machine tool according to claim 4, wherein the holding member (15) has two carrier elements (32, 33), elastically biased towards one another, between which the piezo actuator (24) is disposed in a clamped manner.",
    "7. Machine tool according to claim 4, wherein the holding member (15) has a single-piece carrier part (17) composed of solid material, which has at least one recess (23) in which the piezo actuator (24) is located.",
    "8. Machine tool according to claim 7, wherein the carrier part (17) is composed of metal.",
    "9. Machine tool according to claim 6, wherein one of the carrier elements (33, 32) is fastened to the workpiece table (5).",
    "10. Machine tool according to claim 6, wherein one side (22) of the carrier part (17) is fastened to the workpiece table (5).",
    "11. Machine tool according to claim 9, wherein the other side of the carrier elements (32, 33) is fastened to the machine frame (2).",
    "12. Machine tool according to claim 10, wherein the other side (21) of the carrier part (17) is fastened to the machine frame (2).",
    "13. Machine tool according to claim 6, wherein the holding member (15) has a guide carriage (16), which can be moved along the linear guide (18), and to which a carrier element (32, 33) is fastened.",
    "14. Machine tool according to claim 6, wherein the holding member (15) has a guide carriage (16), which can be moved along the linear guide (18), and to which the other side (21) of the carrier part (17) is fastened.",
    "15. Machine tool according to claim 1, wherein the workpiece table (5) projects away from the machine frame (2) in the manner of a balcony.",
    "16. Machine tool according to claim 1, wherein the workpiece table (5) is a rigid table (11).",
    "17. Machine tool according to claim 1, wherein the workpiece table (5) is a swivelling table (28), which has a base (29), which is connected to the holding device (4) and on which a table arrangement (30) is mounted such that it can be swivelled.",
    "18. Machine tool according to claim 1, wherein the piezo actuator (24) is controlled in dependence on at least one sensor (27) of the machine tool (1).",
    "19. Machine tool according to claim 18, wherein the sensor (27) is a strain gauge.",
    "20. Machine tool according to claim 18, wherein a control unit and/or feedback control unit, which controls the piezo actuator (24) in dependence on information supplied by the sensor (27)."
  ],
  "cpc": [
    "B23Q 1/34",
    "B23Q 1/01",
    "B23Q 11/001",
    "B23Q 17/22"
  ],
  "assignees": [
    "BRATSCHI FRANK",
    "KONVICKA JAN",
    "KINDLER MARKUS",
    "MIKRON AGIE CHARMILLES AG"
  ],
  "filing_date": "2012-02-28",
  "publication_date": "2014-06-10",
  "grant_date": "2014-06-10",
  "priority_date": "2011-03-04",
  "application_number": "US-201213407287-A",
  "family_id": "44358308",
  "citations": [
    "DE102006049867A1",
    "JPS61146440A",
    "US2010032879A1",
    "US6059703A",
    "US6497539B2",
    "US6668692B1",
    "US7784121B2"
  ]
}