(19)
(11) EP 2 228 169 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
03.11.2010 Bulletin 2010/44

(43) Date of publication:
15.09.2010 Bulletin 2010/37

(21) Application number: 08740235.0

(22) Date of filing: 11.04.2008
(51) International Patent Classification (IPC): 
B23Q 1/72(2006.01)
(86) International application number:
PCT/JP2008/057137
(87) International publication number:
WO 2009/069325 (04.06.2009 Gazette 2009/23)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30) Priority: 29.11.2007 JP 2007309057

(71) Applicant: Mitsubishi Heavy Industries, Ltd.
Tokyo 108-8215 (JP)

(72) Inventors:
  • INOUE, Atsushi
    Hiroshima, Hiroshima-ken 733-8553 (JP)
  • FURUTATE, Satoshi
    Shiga-ken 520-3080 (JP)
  • HASEGAWA, Tomoharu
    Shiga-ken 520-3080 (JP)
  • DOMARU, Hiroyuki
    Shiga-ken 520-3080 (JP)

(74) Representative: Henkel, Feiler & Hänzel 
Patentanwälte Maximiliansplatz 21
80333 München
80333 München (DE)

   


(54) MACHINE TOOL


(57) In a machine tool, a column base (12) is supported on a bed (11) movably in a horizontal direction, and a column (13) is installed vertically on the column base (12). A saddle (14) is supported on a side of the column (13) movably in a vertical direction, and a ram stock (15) is supported on the saddle (14) movably in a horizontal direction. A main spindle (16) is rotatably supported by the ram stock (15). A weight (22) is supported in the column (13) movably in a direction parallel to the ram stock (15), so that the weight (22) can be moved horizontally by a servo motor (23). An NC device (25) moves the weight (22) by the servo motor (23) synchronously with a movement of the ram stock (15), to adjust balance of the column (13), thereby enabling to reduce the size of an apparatus and realize space saving- .