Patent ID: 6644900
Filing Date: 2003-11-11
Classification: B23Q,Y10T

Abstract:
A spindle device of a machine tool comprising:a spindle (2); a tool holder (25) mechanically detachably fixed on a tip of said spindle (2) by clamping means (KR) having a center, a pull stud (31) being connected to said tool holder; a longitudinal guiding bar member (16) located in the center of said clamping means (KR); a slipping prevention ring member (21) mounted on said longitudinal guiding bar member (16); an extension passage member (20) inserted slidably through said slipping prevention ring member (21), the extension passage member defining a cylinder having an extension passage (101) and a projecting tip; and a flange formed on an end of said extension passage member (20) distal to said tool-holder to prevent, by engaging with the slipping prevention ring member (21), said extension passage member from slipping, the longitudinal guiding bar member having in a central hole, in order from an end distal to said tool holder to an opposite end, a gas-liquid passage (17), a lubricating coolant atomizing means (18) comprising an atomizing nozzle (23) and a compressed air supplying valve (24), a compression spring (19) and the extension passage member (20), wherein said compressed air supplying valve (24) is pressed toward said atomizing nozzle (23) by said compression spring (19), and said extension passage member (20) is pressed toward the pull-stud (31) so that its tip always projects from a tip of said slipping prevention ring member (21); and said extension passage is in fluid communication with an in-holder spray lubricating coolant passage (102) formed in a center of said tool holder (25).