| 摘要 |
1,192,855. Tool changing; drilling and boring machines. ING. C. OLIVETTI & C. S.p.A. 16 Sept., 1968 [16 Sept., 1967], No. 43981/68. Headings B3B and B3C. In an automatic tool-changing machine tool a tool storage drum 13 rotates about a vertical axis to bring tools 177 into a tool-change position vertically above the tool spindle 14 and the horizontal pivot axis of a rotatable arm 16. The arm 16 comprises diametrically opposite clamping devices for simultaneously gripping the tools in the drum 13 and spindle 14, the arm being moved horizontally from a support 19 to extract the tools from the drum and spindle, rotated 180 degrees, and then retracted, to exchange the tools. The spindle 14 is slidable vertically on the machine column 12 from a working position to a tool-change position. The tool-change operation is controlled electrohydraulically to a programme recorded on perforated tape. Each tool is mounted in a holder that includes identifying collars (113) (Fig. 2, not shown) that operate a set of microswitches so that a desired tool can be stopped in the tool-change position. The spindle 14 is vertically slidable along two guides (125) (126) (Fig. 6, not shown) and the spindle head 18 includes adjustable eccentrically mounted rollers (136) bearing on the guide (125). The drum 13 is indexed by an hydraulic motor (25) (Fig. 5, not shown) through gears (26), (27), (28) and (29), the drum carrying a ratchet wheel engaged by a pawl (31). At a selected stop position of the drum, the drive is reversed to hold the ratchet wheel against the pawl. A further pawl and a micro-switch indicate when the drum is moving or stationary. |
