Machine-outil

摘要

939,566. Drilling-machines; electro-erosion. A. BREGNARD. Oct. 24, 1961 [Oct. 24, 1960], No. 38113/61. Classes 83 (3) and 83 (4). A machine tool for drilling, by means of a rotating spindle or by means of a stationary spindle using electro-erosion, comprises a longitudinally movable slide 8, which rotatably supports a circular work-table 11, and a pattern or drawing table 33. A sprocket 18 and a member 19 are secured to the axle 10 of table 11, and a slide 21 is longitudinally-movable in member 19, and carries a template 23. Template 23 has pin 25-27, spaced to correspond with the holes 2511-2711, to be drilled in work W, and the pins are locked in their required position by a sliding sleeve 28. A sprocket 35 is secured to the axle 32 of table 33, and is rotated by sprocket 18 through a chain 36, and an indicating means 37 located above the pattern or drawing 34 is secured to the machine base 7. Means 37 comprises a rectangular frame having two fine wires forming a centre which coincides with centre O of table 33 when the axis of table 11 coincides with the axis of tool spindle 4. In operation, drawing 34 is placed on table 33 with marks 38, 39, aligned and workpiece W is placed on table 11 in the correct position relative to template 23 and drawing 34 by means (not shown), and clamped by clamps 13. Table 11 is rotated by a handle 17 until mark 251 on drawing 34 is located at 25111 below wire 37b. Slide 8 is then moved by handles 9 or by a motor a distance X until pin 25 on template 23 is aligned with sleeve 28 and tool 5, and sleeve 28 is moved to engage the pin by a handle 29. The hole is drilled, and the workpiece is aligned with tool 5 for each of the other holes to be drilled. Template 23 may have hundreds of pins for various workpieces and the pins may be replaced by holes which are located in their required positions by a peg 28. Table 11 may be rotated by a motor, movements of sleeve 28 may be effected by hydraulic or pneumatic means, and sprockets 18, 35, and chain 36 may be replaced by a gear train. In a modification indicating means 37 comprises an engraved glass plate, or this may be replaced by a device for projecting a luminous cross or light spot on the drawing.