| 摘要 |
1,139,448. Turret lathes. NATIONAL ACME CO. 29 Sept., 1966 [4 Oct., 1965], No. 43533/66. Headings B3B and B3T. A machine tool such as a turret type lathe comprises a work-holding turret 15 mounted on a frame 12 with an annular table 33 which is indexable about a first (vertical) axis 13 and has a plurality of rotatable work-holder spindles 17 disposed in a plane at right angles to the first axis and a plurality of tool-holder units 46 are provided each having a base by which it is secured to the frame. Gear driven cam means is provided in each unit 46 to move each toolholder in a path in a plane perpendicular to the turret axis to effect machining of the workpiece. The tool-holder units may be radially oriented in a plane perpendicular to the turret axis and to the axis of a respective work-holder spindle. The tool-holder units may also be selectively positioned peripherally around the annular table 33, an inner peripheral area of the frame being provided with openings 34 to facilitate the passage of chips. More than one toolholder may be associated with one work spindle depending on the machining operation required. In the embodiment shown six work-holder spindles are shown and the turret is automatically indexed to each of six successive positions by a " Geneva " mechanism. At two successive positions of the turret means are respectively provided to remove a finished workpiece from a spindle and insert a further workpiece in the spindle work-holder. The fresh workpieces are supplied to the spindles via a hopper 41. The turret, work spindles and toolholders are driven from a main driving motor. |
