GB464733A - Improvements in automatic lathes and like machines - Google Patents

Abstract

464,733. Lathes. FAIRWEATHER, H. G. C. (National Acme Co.) July 30, 1936, No. 21125. [Class 83 (iii)] Chucks.-An automatic multi-spindle or single-spindle bar-stock lathe has a main tool slide and an auxiliary tool slide which is movable relatively to the main slide and carries chucking or pick-up means rotated synchronously with the work spindle, the main slide serving during its advance movement to close the pick-up means onto the work to support and rotate it during the operation first of a parting tool and then of a finishing tool. As applied to a multispindle work turret lathe, the driving shaft 4, Fig. 5, of the work spindles 3 passes through the usual main tool-slide 5 carrying the endworking tools. The slide 5 carries an auxiliary slide 6 movable longitudinally thereon and provided with a pick-tp work holder consisting of a housing 7 fitted with a rotary spindle 8 and a collet 8<1>, Fig. 4. The spindle 8 is rotated at the same speed and in the same direction as the work spindles by a shaft 9 driven from the central shaft 4. The auxiliary slide is operated by cams 12 mounted on the usual cam-shaft and connected through a link 13, arm 14, and rod 15, to the housing 7. The spindle 8 is moved forward at the cutting- off station to grip the end of a piece W which is being cut off by a tool 31, and is then partially returned, Fig. 11, with the severed piece to permit a finishing tool 35 to be brought into alignment therewith, whereupon the spindle 8 is again moved forward for the finishing operation and then finally moved back and the completed work-piece ejected. The slide 5 has a trip 17 coacting with the end 18 of a swinging finger 19 operating the sliding chuck yoke 21. After the pick-up spindle has been moved up to the work-piece, the subsequent advance of the main tool slide 5 actuates the chuck yoke to grip the work. A fixed bracket 32 carries a swinging arm 33 fitted with the holder 34 of the finishing tool 35 which may perform a boring, drilling, facing, chamfering, reaming or other operation. The arm 33 is connected by an arm 37 to a lug 36 on the cross slide 30 so that as the cross slide is moved forward for the parting operation the tool 35 is retracted, and vice versa. When the finishing tool is in position, the pick-up spindle is moved to carry the work up to the tool and the pick-up then fully withdrawn. During this movement the yoke 21 engages a stop rod 24 to open the chuck, whereupon the workpiece is ejected by a spring plunger 40 located within the collet. The fully withdrawn position of the pick-up to cause ejection of the work is shown in dotted lines, Fig. 11.