GB707505A - Improvements in machine tools with a rotary spindle such as milling and boring machines and the like - Google Patents

Abstract

707,505. Boring, facing, turning and milling machines. SOC. NOUVELLE DE CONSTRUCTION DE MACHINES OUTILS ET D'OUTILLAGE PROCEDES C. W. B. May 23, 1952 [May 26, 1951], No. 13127/52. Class 83 (3) A machine tool comprises a turret 2 which is provided with recesses to receive interchangeable tool units and which is rotatably mounted on a body 1 adapted for mounting on a rotary spindle of the machine, the recesses comprising a first series 46 located in the axis of the machine spindle for a series of given angular positions and a second series 47 which are, at all times, transverse to the axis. The turret-head is made of light alloy with mild steel locating rings 26, 28, Fig. 4. and is mounted by T-bolts 5 and a spigot 16 on the headstock 4 of a boring, turning, surfacing, milling, tapping and drilling machine. The machine has a table 10 rotated by a motor 11 and the headstock is axially and vertically adjustable on a movable column 20. As an example, a milling unit 49 is mounted in one of the axial recesses 46, four of which alternate with four transverse recesses. The unit is located by a key 57, Fig. 6, by a steel ring 55, and at its rear end, by the alloy body 2. It is' secured by screws 54 and, when mounted, a handle 95 is moved axially to engage a tongue 97 with a yoke- 'actuating member 99. The yoke 94 moves a shaft 84 to engage splines 85, 87 with splines 90, 88 on a driving sleeve 79 carrying a bevel :gear 82 The sleeve 84 is always in splined engagement with the tool head 48. As shown, a similar unit is mounted in an adjoining recess 47. All the units are driven from the main spindle 17 through gears 203, 194, and one of two gears 118 or 155. A hand knob 182 determines the position of a clutch 136 to drive either the transverse or the axial units. The turret is controlled by a lever 403 which is carried on a multiple cam 399. A projection 405 on the cam operates a switch 407 to energize a magnetic coil 33 in the ring 28 and clamp the turret in position. Projections 408, 409 rock a shaft 345 to release a turret locking-bolt 379 against the force of a spring 396 and, through a lost-motion connection 353, to operate a motor-control switch 367 and engage a plate-clutch 263 through a yoke 316. The motor 299 mounted on the turret-head rotates the turret through worm-gearing, the clutch 263 and the ring gear 38. When the turret is released for rotation, a weaker current flows in the opposite direction through the coil 33 to destroy the residual magnetism. The lever 403 is held in position III if continuous rotation of the turret is desired. If the lever is released the spring 396 moves the bolt 379 to lock the turret and returns the lever to position II. Tool-holders.-A turning-tool in the holder 426, Fig. 12, has threaded holes 429 to secure the tool and is secured in a recess by the flange 427. Covers 431 close recesses not in use. Three crane-handling hooks such as 432 are fitted. Specification 687,280 is referred to.