GB426359A - Improvements in or relating to automatic machines for cutting off predetermined lengths from metal stock-bars - Google Patents

Abstract

426,359. Lathes. MERCER, C., Park Cottage, Park Road, Radlett, Hertfordshire. Nov. 8, 1933, No. 31098. [Class 83 (iii)] In a machine for cutting off predetermined lengths from stock bars such as for making nut or bolt blanks from hexagonal bars, 9, with or without performing a forming operation on each length of bar, a number of hollow rotary work spindles 1-6 through which the bars are intermittently fed are arranged around a continuously rotating head 7 carrying a corresponding number of tools 10 which are reciprocated to and from the work-spindles by a stationary cam groove 11 which acts on rollers 12 to impart one cyclic reciprocation to each tool-slide 13 for each revolution of the head. The severing operation is in the case of each spindle completed at the lowest point A of the spindle travel so that the severed blank may drop into a receptacle 17 or into a shoot. While a spindle passes from A to C the corresponding tool is quickly withdrawn so that the bar may be fed at the point C and the tool returned to start the cut on the next length at B. The spindles are driven from a motor 18 through a belt 20, shaft 22, gears 24, 27 and large gear 28, integral with an internal gear 30, Fig. 4, engaging pinions 31 on the spindles. The gear 27 is also connected through pinion 62, clutch 57, gearing 60, bevel gearing 64, and worm gearing, (not shown), to the head 7 which is thus driven slowly to impart the orbital movement to the spindles. A stationary shaft 37 secured to a front bracket 38 carries cams 39, 40, controlling the chuck-opening and workfeed respectively. The cam 39 actuates a follower 41 to slide a member 43 coacting with pivoted fingers 44 to operate the sleeve 47 of the collet chuck 48. When the chuck is open the cam 40 slides a member 53 on the feed tube 54 which feeds the bar by the desired step. The head 7 may be manually rotated by a hand crank applied to the shaft 56, the clutch 57 being disengaged. In a modification, the cam 11 may be manually rotated for setting-up purposes.