GB247908A - Multiple drilling mechanism - Google Patents

Abstract

247,908. Toledo Automatic Brush Machine Co., (Assignees of Jobst, C.). Feb. 19, 1925, [Convention date]. Drilling-machines; drilling brush stocks. -In a multiple. spindle drilling. machine, particularly designed for drilling the stocks of toothbrushes, the spindles are rotated by eccentrically moving plates engaging cranked portions thereon, and the stccks are mounted in a turret which is fed to the drills for operating on a different blank at each stroke, the turret being indexed during both the rearward and forward strokes. Driving machine-spindle; spindles.-The drills 21 are rotatably mounted in plates 14 spaced apart by collars 17 and have cranked portions engaged by a plate 11 which is given an eccentric movement by means of pins eccentrically disposed on the ends of shafts 7 rotated by gears 8 and bevel gears 3 from the main shaft 2. The lower ends of the drills rest on a plate 12 also partaking of the eccentric movement and supported by a ball bearing 13 which receives the working thrust. Turrets: feed-motions.-The brush-stocks are held in recesses 25 in a turret 34 rotatably carried on a cross-head 24 vertically reciprocated for feeding the stocks to the drills, by means of rods 23 and a cross-head 25, having rollers 33, 33<a> engaging two cams 32<a>, 32<b> on a shaft 32 driven by reduction gearing 29 from the shaft 2. Springs 26 assist in the upward movement of the turret. The depth of feed is determined by adjusting the cross-head 24 by means of graduated nuts 25. The turret-spindle carries an indexplate 36, Fig. 3, and a ratchet-wheel 37, the former being engaged by a spring plunger 42 which is withdrawn periodically by a cam 41 on a pawl 38. The two pawls 38, 39 are pivoted to the stationary frame of the machine and rotate the turret during both upward and downward movements while the work is clear of the drills. The rotation is commenced during the upward stroke by the pawl 38 and continued, if necessary, during the downward stroke by the pawl 39, the latter being yieldingly mounted at 40 to allow the crosshead to complete the feeding-stroke after the plunger 42 has engaged the index-plate. Cuttings, catching and removing; jigs. - The drills project through and are guided by a perforated plate 18, Figs. 1 and 2, which is depressed by the work against the action of springs 20. When the work is withdrawn the plate clears the drills of cuttings, which are removed by the nozzle 27 of an air blower.