Patent GB-654353-A (GB)
Title: Improvements in and relating to self-contained tool-feeding units for lathes and like machine tools
Inventor: BICKEL CLIFFORD ALCETT
IPC: B23Q37/00
Filed: 1946-07-02
Abstract: 654,353. Lathes. MONARCH MACHINE TOOL CO. July 2, 1946, No. 19830. [Class 83(iii)] A self-contained tool-feeding unit for lathes and like machine tools comprises a bed carrying electric motor means, first and second slides movable in different directions relative to said bed, and first and second drives between said motor means and said slides, and including electrically-controlled means for effecting driving connection between said motor means and said slides through either of said drives, said elecelectrically - controlled means being adapted to be energized by operation of switch means and cam means carried on said bed and said first slide, and lost-motion means responsive to initiation of movement of said first slide in either direction for first causing relative movement between said slides. General.-The self-contained unit adapted as a tool-rest, Fig. 1, comprises a base 10 to be clamped by bolts 10a to the bed of a lathe or like machine tool, a casing 18 carrying the driving motor and feed mechanism for the slide 23 moving on the guideways 21. A top slide 103, to which the tool rest is attached, is capable of limited transverse movement on guides 23a, 23b to relieve the tool at the end of a cutting stroke. The whole of the upper portion of the unit may be adjusted angularly about the base 10. Feed mechanism.-Power is obtained for feeding the unit from a three-phase reversible electric motor 36 housed within the casing 18. This drives through toothed gearing 37, 38a, 38b, 48, 51, Fig. 2, a pair of shafts 39, 52, these carry armature driving cores 44a, 54a, respectively, secured thereon, forming parts of electro-magnetic clutches 44, 54. The armatures 44b, 54b, respectively, of these clutches may be selectively driven when the armatures 44c, 54c are energized, or, they may be braked when electromagnetic brake members 47, 57 are energized. The armatures are splined to shafts 45, 55, respectively. Shaft 45 drives through worm gears 58, 59, pick-off change gears 62, 63, worm gears 65, 66, and pinions 69, 70, 83, to the casing of a differential gear 78. Shaft 55 drives the bevels 77, 87, 88, &c., of the differential and the coaxial pinion 86, the latter drives through toothed gears 76 (broken for simplicity of illustration) and 90, a lead-screw 91. A pinion 93 is driven by the shaft 91 through a lost-motion device, Fig. 2A, to drive a pinion 35 secured to a second lead-screw 29. The first lead screw operates a nut 96, Fig. 3, and an auxiliary slide 97, 100. Wedge teeth are provided along the adjacent edges of member 100 and parts 101, 102, Fig. 8, secured to the transversely movable top slide 103. The member 100 may be arranged to engage either part 101, 102, according to the direction in which tool-relief is required. When pinion 90 and lead screw 91 rotate the slide 100 is moved a small distance relative to main slide 23 to disengage the wedge teeth and give slight transverse movement to the slide 103, drive to the lead screw 29 then commences and this moves the slide 23, both screws rotating synchronously until a reversal of the drive takes place and the upper slide is given similar transverse movement in the opposite direction to relieve the tool. With electromagnetic clutch 54 operating and shaft 45, and hence the housing of the differential braked, a high-speed drive is imparted to the lead-screws. When, however, clutch 44 is operated and shaft 55 braked a slow-speed drive to the lead-screws results. Switch mechanism is provided for giving a cycle of operations which includes high-speed idle movement of slide 23 up to the work, slow-feed working movement and a high-speed reverse obtained by reversal of the motor 36 and the high-speed gearing. Control.-Automatic control for the high and slow speed movements and the reversal &c. is obtained from adjustable stop members 149a, Fig. 3 (three are provided in the same plane). The stops are carried by members 149 which move in guides in the slide 23 to prevent rotation and are set by means of screws 141 rotated by squared portions extending beyond the end of the slide. Circular graduations are provided on collars secured to these screws to facilitate setting, but, in addition, a transparent cover 158 is provided whereby linear setting scales adjacent the stop-members 149 may be observed. When the slide moves the stopmembers contact a row of switch operating members 130, Fig. 3, arranged within the unit. Specification 649,084 is referred to.