| 摘要 |
1,088,232. Machine tool details. GIDDINGS & LEWIS MACHINE TOOL CO. Jan. 12, 1965 [Jan. 16, 1964], No. 1301/65. Headings B3B, B3K and B3T. A draw bolt comprises male and female members having co-operating formations 72 which can be inter-engaged by relative rotation of the members after one has been inserted within the other. A boring, milling and drilling machine has a saddle 26 with outboard guideways 32, a cross-slide 35, a tool storage drum 50, a tool-change shuttle in a structure 54, and a tool-change arm 52 for exchanging a tool in the spindle 45. A tool 57, Fig. 2, has a flange 61 to be gripped by the tool-change means, recesses 66 to receive driving dogs on the spindle, and a tapered shank 59 having an axial recess which has threaded lands to co-operate with the end of a draw-bar 70. A rotation of less than 45 degrees from the position illustrated in Fig. 10 is sufficient to lock the tool in the spindle. The draw-bar is rotated by springs moving a quick-pitch ball-nut, fixed against rotation, on a screw fixed to the draw-bar, the tool being released by fluid pressure means acting against the spring. The tool-change arm, having a pivoted gripping finger, delivers the tool in a certain angular position to the spindle which is itself located angularly by a fluid pressure operated plunger. The plunger 96, Fig. 6, is moved radially into a recess 94 in a spindle sleeve 92 when dogs 105 on the spindle engage positioning switches 106 while the pindle is being slowly rotated. The spindle 45 is advanced by fluid-pressure axially to pick up a tool and is then retracted to the operating position. |
