| 摘要 |
903,507. Drilling; screw-cutting; machinetool details. GNUTTI, M., GNUTTI, O., GNUTTI, Q., GNUTTI, E., GNUTTI, E., and GNUTTI, V., [trading as OFFICINE DI OSPITALLETTO]. May 11, 1960 [Jan. 16, 1960], No. 16600/60. Class 83 (3). A machine tool for machining T-piece unions &c., comprises means T for conveying workpieces successively to boring and screw cutting tools which act on successive workpieces simultaneously. The machine has three drilling units A 1 -A 3 and three screw-cutting or threading units B 1 -B 3 . The tools may be rotated by belt gearing and the feed screws in the tapping or threading units may be exchangeable. The units may be mounted for angular adjustment. Four working stations and one unloading station SC, Fig. 5, may be provided on the turret T. The turret is indexed by a pneumatically-operated piston having two heads 13, Fig. 4, between which is an oil chamber acting as a dashpot. The piston carries rack-teeth 11 engaging a sector mounted with a one-way clutch on the turret-shaft 4 and its stroke is varied according to the stations on the turret. The workpieces are each clamped between a fixed jaw 21, Fig. 5, and a jaw 21<SP>1</SP> moved against a spring 22 by a fixed cam 28 acting through a rod 25 and a lever 23 as the turret is indexed. In a modified turret, the jaws 21<SP>1</SP>, Fig. 7, are operated by a piston 30 through levers 29, and, by providing a central fixed jaw 21, two workpieces may be held at each turret position. In the latter case, an attachment having twin spindles U<SP>1</SP>, Fig. 8, is provided at each machining position. |
