Patent ID: 6634839
Filing Date: 2003-10-21
Classification: B23Q,Y10T

Abstract:
A machine tool of the type comprising:at least one spindle mounting slide extending mainly longitudinally along a defined axis and able to move in a direction parallel to said axis, the spindle mounting slide presenting a lower end on which a spindle is mounted and an upper end opposite to said lower end; a fixed slideway extending in said direction and comprising a lower portion having fixed sliding means which are integral with the slideway itself, engaging with runners which are integral with the spindle mounting slide; at least one linear electric motor, a primary member of which is connected to the slide and a secondary member of which is connected to the slideway; the lower portion extending longitudinally in said direction for a distance shorter than the longitudinal extension of the secondary member; the spindle mounting slide being movable, relative to the fixed slideway, at least between a first retracted end position, in which the upper end of the spindle mounting slide, having at least one portion of the primary member, projects from the fixed sliding means, faces the secondary member and it is not supported by said fixed sliding means, and a second extended end position, in which the upper end of the spindle mounting slide, having said at least one portion of the primary member, is supported by the fixed sliding means; wherein the slide further comprises sliding contact means that oppose the slideway at least when said upper end projects from the fixed sliding means facing the secondary member and the magnetic force is attracting the primary member and the secondary member of the linear electric motor to each other.