Patent GB-119865-A (GB)
Title: Improvements in or relating to Machines for Cutting Gear-Wheels
Inventor: WINGQVIST ERIK HJALMAR
IPC: B23F5/20
Filed: 1918-09-23
Abstract: 119,865. Wingqvist, E. H. Oct. 1, 1917, [Convention date]. Gear-cutting; feed motions.-A gear-cutting machine, chiefly for bevel gears, has two rotating cutters 27 acting in a single tooth gap to generate the tooth flanks by a simultaneous revolution of engaging the wheel blank corresponds to a tooth of an imaginary generating wheel A, the frame of the blank 3 and the member 55 both pass through the apex of the pitch cone of the blank. The cutters 27 are driven by an electric motor M mounted on the frame 45, and they are axially adjustable to vary the width of the gap to be cut. In order to adjust the cutters so that the portion 45 is slidably mounted on a frame 48, which is pivotally mounted at 51 on a frame 52. This frame can be slid laterally on the pivoted member 55 to adjust the cutters 27 for cutting skew gears, and is carried by the member 55, pivoted on a frame 26, normally locked in working position on the bed 1 by an adjustable stop 65, engaged on one side by a portion 69 of the frame 26, and on the other by a spring-operated sliding belt 70, which is lifted, when it is desired to withdraw the frame 26, and therefore the cutters 27 from the work, by a hand-operated pinion 63 engaging a rack 64. The blank 3 is carried by a frame 20 mounted to slide in a direction parallel to the axis of the blank 3, on a member 22 pivotally mounted on pins 23. By these adjustments the blank 3 is brought into position for engagement with the imaginary crown wheel A. The blank 3 is rotated by worms 14, 15, and the frame 55 is rotated at a proportionate speed by worms 60, 61. Both pairs of worms are driven from the same coned belt-pulley, through reversing-gear and suitable change-speed gear. The reversing- gear is operated when the frame 55 has turned sufficiently far for the cutters 27 to be clear of the bank, by studs pressed into the path of a continuously-revolving cam by means actuated by a shaft 134 connected by links to levers operated by a pin 126 on a falling pivoted weight 127 raised to its highest position by stops 122 adjustably secured to a plate 124, actuated through gearing 120, 118 from the frame 55. The indexing of the blank is accomplished by driving the frame 55 through differential gear, the centre wheel of which is normally held fast by gearing to a locking disk. At each operation of the reversing-gear, or at every second operation thereof, while the cutters are out of engagement with the blank, a locking-pin is momentarily raised to release the locking-disk for one revolution, thus allowing the centre wheel of the differential gear to turn and delay the movement of the frame 55 while the blank 3 moves through the distance of one tooth. To cut spur gears, the frame 55 is held stationary, and the slide 52 is reciprocated transversely by gearing. When all the spaces have been cut a counting mechanism may disconnect the cone pulley. Specification 104,515 is referred to. Blacklash, preventing.-One of each of the pairs of worms 14, 15 and 60, 61 is adjustable axially. Chucks. - The blank 3 is held, by a slotted washer and draw spindle, on the cylindrical end of a sleeve the inner end of which is coned to engage a socket in the hollow spindle. Rotatably but not axially movable in the rear end of the hollow spindle is a nut provided with' a hand wheel and engaging the threaded end of the draw spindle.