Patent GB-190307288-A (GB)
Title: Improvements in and relating to Metal-working Lathes
Inventor: GRIDLEY GEORGE OTIS
Filed: 1903-03-28
Granted: 1903-06-11
Abstract: 7288. Gridley, G. O. March 28. Lathes.-An automatic lathe is provided with a polygonal turret 33 carried by a hollow spindle 32 below the main spindle 150, and having guideways on each of its faces for slides 39 carrying longitudinally adjustable tool-holders. The slides have pins 44 passing into the turret so that the uppermost slide may be moved longitudinally by an arm 53 with an open groove to engage the pin 44, the arm being secured upon an actuating- bar 48 passing through the turret spindle. One end of the actuating-bar is connected to a slide 49 moving in a guideway 52 on the framing 30 and carrying a bowl 71 engaging cams 60 on a drum 59 on a shaft 58. The slope of the cams is such as to give various rates of feed to the different tools and a quick withdrawal to all. The cams have feet engaging in slots 61 in the drum to prevent twisting, and the cams are adjustable along the grooves by screws 67. The shaft 58 is driven by gearing 57 from a rear shaft 55 driven by worm gearing 74 from a transverse shaft 76, which may bo turned by a band-wheel 77 or driven at fast and slow speeds by an independent belt and pulleys 80, 81, the pulley 80 being keyed to the shaft and the pulley 81 driving the shaft through an epicyclic train 83. The belt-shifter is operated by cams 91 on a disc 92 on the shaft 55. The turret is intermittently rotated by a shaft 103 driven by worm gearing from a transverse shaft 98 driven by a separate belt and pulley 97. The shaft is capable of longitudinal movement without disturbing its connection with the shaft 98, and is normally returned to its extreme left position (as viewed from the front of the lathe) by a spring. At desired intervals, determined by cams 121 on a disc 122, the shaft is moved to the right causing a cam 148 on it to be brought opposite a slide 145 connected to a locking-bolt 141, and also a pin 125 on a disc 126 to be brought in line with a disc 124 secured on the turret spindle 32 and having radial grooves corresponding in number to the slides on the turret. By these means the locking-bolt is withheld while the turret is rotated one step by the engagement of the pin 125 with one of the radial grooves, the locking-pin being returned by a spring 144 to lock the turret. The movement of the shaft to the right is produced by the engagement of a vertically-movable spring pin with a cam-groove on the shaft, the groove also acting to reset the pin when the shaft 103 has made one revolution, the shaft then returning to the left and the pin being held by a spring latch tripped by the cams 121. The locking-pin 141 engages notches 129 in a wheel 128 secured to the turret spindle and having set-screws by which the turret may be drawn against the face 36 of the bearing in the framing 30. The main spindle 150 is driven in either direction by oppositely-moving belts on fast and loose pulleys, the belt-shifter being controlled by cams on a disc 160. The chuck 161 has ordinary opening and closing mechanism 162 operated by a slide 171. A friction feed for the stock bar 167 is obtained by a bushing 165 operated by a slide 172, the two slides 171, 172 being operated by cams on a drum 180 rotating in unison with the shaft 55. Grooves are provided on the turret between the flat faces to receive various accessories, such as a bridgepiece or guide for a boring-bit or drill, templets for taper turning, &c. Various features of the invention may be applied to hand-controlled as well as to automatic lathes.