GB806853A - Multi-spindle drilling machines - Google Patents

Abstract

806,853. Drilling-machine details. SERCK RADIATORS Ltd. March 11, 1957 [March 14, 1956], No. 7945/56. Class 83 (3). In a multi-spindle drilling- machine having a work-table, a laterally-movable headstock on a guide supported by pillars, and a number of drillspindles mounted vertically on said headstocks, the drillspindles are selectively engageable with fluid-pressureoperated feed - mechanism. Bearings 12 carrying the drillspindles 13, are laterallyadjustable on guide-bars 14 mounted on the headstock 9, by pinions 15, meshing with rack-teeth on the bars. Upper and lower shafts 40, driven by a motor 41, respectively transmit rotation to alternate drill - spindles 13 through helical gears 42, 43. Each spindle 13 is held by a bearing 19 in a head 20, and can be displaced vertically by connecting the head by a latch 21 to a member 18 operated by fluid-pressure means 16, 17. A piston-rod 27 of a cylinder 25 mounted on each bearing 12, carries a tappet 28 engageable with contacts 29 which electrically control the pressure to the cylinder 25. In operation, each latch 21 is normally pressed by a spring 38 into a recess 23 of its bearing 12, but for drilling a predetermined pattern of holes in a row, selected latches are moved by their pistons 27, which engage yokes 30 on the latches, into engagement with recesses 22 in member 18, whereupon energization of cylinder 16 feeds the selected spindles to the work. During feed, the operative latches 21 are locked by spring-detents 31 engaging notches 33 therein. At the end of the return stroke of the piston 17 and spindles, detents 31 engage stops 34 to release the latches 21 for return to recesses 23 by springs 38, the yokes also returning pistons 27 to starting position. The valves for cylinders 16, 25 may be controlled by punched cards or tape, which may also control a motor 11 to traverse the headstock 9 laterally, through a screw 10, between successive drilling operations, to drill additional similarly or differently-spaced holes in a row, and may also control a motor for traversing the work-table for drilling additional rows of holes. The punched cards &c. may operate through electronic, photo-electric, &c. means.