Patent GB-1118065-A (GB)
Title: Improvements in boring and facing heads
IPC: B23B29/034
Filed: 1966-09-13
Abstract: 1,118,065. Boring and facing head. J. A. SCHOLL. 13 Sept., 1966 [15 July, 1966], No. 36961/66. Heading B3C. A boring and facing head 10, Figs. 1 and 2, comprises a rotatable body 12, a tool carriage 18 slidable in a slot 16 in the body by means of a worm drive 34, 31, a pair of adjustable stop plates 28, 30 which engage a peg 32 to limit the radial movement of the carriage 18, and a clutch mechanism. Worm 34 is integral with a wormwheel 36 which is driven by an internal ring gear 44, Fig. 3, through gears 42, 38, gear 44 having teeth 48 which mesh with lower gears 49 of two gear assemblies 50a, 50b. The shafts 51 of the gear assemblies are journalled in a rotatable ring 52 which has a torque rod 58 secured thereon which co-operates with any one of a number of stationary studs 70, Fig. 2, to prevent the ring from rotating when body 12, and its shaft 14, rotate. Gears 53, Fig. 3, mesh with the teeth 60, Fig. 5, on a ring 62 which can rotate inside 'of ring 52, and :has grooves 73 which co-operate with a pin 72. The latter is carried on a lever 75 which is pivoted by a shaft 76 whose radial position is controlled by a device (100), Fig. 11 (not shown). The device comprises spring-urged angled pins (104), (106) which engage notches 122, 124 in shaft 76. In operation, starting from the position of Fig. 3, shaft 14 and body 12 are rotated by a shaft 64 and ring 52 is held stationary by a stud and rod 70, 58, Fig. 2. Ring 62 is locked to body 12 by pin 72, Fig. 5, and a recess 73, and rotates therewith. Ring 62 rotates gears 53, which rotate gears 49, causing gears 44, 42, 38, wormwheel 36, and worm 34 to rotate and thus advance tool carriage 18 by rack 31. The carriage is advanced until stop plate 30, Fig. 1, abuts peg 32, whereupon rotation of the gear train stops, ring 62 continues to rotate, and pin 72 is forced out of the recess 73. Lever 75, Fig. 3, pivots, and tends to move shaft 76 outwardly so that the end (106) of device (100) slides along the angled face of notch 124 but does not move out of the notch. Pin 72 encounters the next recess 73, shaft 76 reciprocates slightly, and shaft 14 and body 12 continue to rotate while carriage 18 is held stationary. The direction of rotation of shaft 64 is now reversed automatically by computer control, ring 52 turns, until rod 58 abuts the next stud 70, and the same driving action takes place, but in the reverse direction. To convert the head to manual control, control device (100) is reversed so that angled pin (104) engages notch 124 in shaft 76. Carriage 18 is moved in :the same manner as before until plate 30 abuts peg 32; whereupon pin 72 is forced out of recess 73 and lever 75 pushes shaft 76 radially outwardly until pin (104) engages in notch 122, thus-preventing carriage 18 from being driven. To effect retraction of the carriage under manual control without change of direction, a reverse button (150) on a shaft (151), Fig. 6 (not shown), is provided, which when depressed engages a pin (170) in an upper notch (175) in the shaft which couples ring 52 to gear 44 and effects a by-pass of the gear assemblies 50a, 50b. Gears 42 are rotated in the opposite direction by moving around stationary gear 44, and worm-wheel 36 and worm 34 rotate in the opposite direction, so that carriage 18 is retracted until stop plate 28 abuts peg 32. Gear train 31, 34, 36, 38, 42, 44 locks, the end of shaft 151 is forced out of the tapered recess 166 in gear 44, angled pin (170) engages in lower notch 177 of shaft 151, and gear 44 is unlocked from ring 52.