GB1192888A - Machine Tool - Google Patents

Abstract

1,192,888. Lathes. KEARNEY & TRECKER CORP. 14 May, 1968 [22 May, 1967], No. 22954/68. Headings B3B and B3T. A machine tool such as a lathe comprises a bed 30 which supports a horizontally movable headstock 31 carrying a rotatable work holding spindle 41, a support unit 56 secured to one end of the bed which carries a housing 147 on which is mounted an indexable tool holding magazine 145 and a rotatable tool changer 146, a cross slide 62 mounted on an inclined slideway 61, 59 which is secured on the bed and carries an indexable tool holding assembly 63. A workpiece transfer device 306 is mounted on the bed adjacent the headstock and includes an S- shaped member the arms 308 and 309 of which are adapted to grip by way of fluid-actuated plungers 312, 313 and remove a finished workpiece from the work spindle and by rotation of the member about an axis parallel to the spindle, position a fresh workpiece in the work spindle. A workpiece handling device 305 is located adjacent the transfer device 306 wherein a new workpiece (NW) is secured in a chuck 311 orientated with its axis vertical on a frame which is pivotable through 90 degrees by fluidactuated means 371, 372 to position the chuck and workpiece NW with their axes parallel to the work spindle so as to be engageable with an arm of the transfer device whereby upon rotation of the transfer device a finished workpiece is removed from the work spindle and a fresh workpiece is located therewith. The headstock with the workpiece is traversed along the bed by a feed screw 34 to bring the workpiece into machining engagement with the cutting tool 65 which is prepositioned in order to perform a turning or boring operation. The rotation of the headstock spindle 41 is effected through gears and reversing clutches from a main motor, means in the form of a pin and notch mechanism being provided to effect stopping of the spindle in a predetermined angular position. The chuck with workpiece is securable to the spindle by way of a fluidactuated draw-bar and lever clamp mechanism 293 and 279 in which axially projecting teeth 273 on a ring member 274 on the chuck are held into engagement with corresponding teeth 272 in a ring member 271 in the spindle 41 by the levers 279 when the draw bar is actuated. A similar clamping arrangement is provided on the handling device 305 for holding the fresh workpiece prior to transferring it to the spindle. In operation the tool magazine 145 is indexed to bring a required cutting tool 65B into position for removal by the tool changer 146, the arms of the tool changer, Fig. 4 (not shown), simultaneously engaging the tool 65B in the magazine and the tool 65A in the holding assembly 63, and axial displacement of the changer removes the tools from their respective locations. The changer is then rotated through 180 degrees to interchange the positions of the respective tools 65A and 65B and then a return axial movement effected to locate the tools in the magazine and holder assembly. The toolholder assembly 63 is indexable to a desired position depending on whether a turning or boring operation is to be performed, the assembly being in the form of a swivelling and elevating tool post which is fluid actuated. With the cutting tool in its required operating position the tool slide 62 is actuated to locate the tool in relation to the workpiece and the headstock traversed towards the cutting tool to effect machining of the workpiece. When the machining operation is completed the headstock with the workpiece is withdrawn to a predetermined position whereat the finished workpiece is exchanged for a fresh workpiece by the transfer and handling devices already referred to. The whole sequence of operations may be effected automatically by way of coded tape or each operation in the machining cycle may be initiated manually by push button. Circuits showing the hydraulic and electrical operation of the machine are described with reference to Figs. 13 and 14 (not shown).