Patent GB-500928-A (GB)
Title: Gear shaping machine with swiveled spindle carriage support
IPC: B23F5/16
Filed: 1938-05-25
Abstract: 500,928. Gear-cutting. MILLER, E. W., and FELLOWS GEAR SHAPER CO. May 25, 1938, No. 15660. [Class 83 (iii)] In a machine for shaping gears and similar notched articles by means of a reciprocating gear-shaped or like cutter which is rotated in unison with the work the cutterspindle 34 is mounted in a saddle 25 which is moved lengthwise along a swivelling arm 24 which is movable angularly to carry the cutter into and out of operative relation with the work holder 22. The arm 24 is of hollow construction and is secured to a hollow pivot 27 moving angularly on a column 23. The arm 24 has guides 30, 31 for the cutter saddle and the cutter 35 may thus be adjusted according to the size of the blank mounted on the table on either side of the table axis and may also be swung aside completely for mounting the work. In the operative position, the end of the arm 24 is secured in a notch in a standard 26 by means of a screw operated from a hand wheel 46 and engaging a threaded sleeve in the arm. Accurate location of the arm is secured by means of hardened abutment plates 37, 42, Fig. 2. A motor 48 mounted on the opposite side of the arm 'from the cutter saddle drives through belt gearing 49-51 a shaft 52 connected by change wheels 54 and other gears 57, 58, to a crank-shaft 53 carrying an adjustable crank disc 59, Fig. 11, connected through a rod 61 and extension spindle 65 to a rack 62 which oscillates a rock-shaft 64. This shaft carries long gear teeth 70 which in all positions of saddle adjustment engage with rack'teeth on a sleeve 72, Fig. 6, to reciprocate the cutter spindle in a guide bushing 73. The sleeve 72 is connected to the spindle through thrust 'bearings 74, 75. By adjustment of the rack 62 the limits of the cutter stroke may be altered without changing the stroke length. The generating rotations of the cutter and work are derived from a worm 76 on the shaft 53. This is connected through gear 77, Fig. 15, change wheels 80, spur and crown gears 82, 83 and 85, 86 shaft 87, reversing gearing 88, 89, shaft 90, and splined worm 91 to a worm wheel 92 imparting rotation to the cutter spindle. A branch train from the shaft 87 is connected through change wheels 96'.. 99 shafts 103, 106 and reversing gearing 108 to a worm 110 imparting corrcsponding rotation to the table. The shaft 103 is located in the pivot axis of the machine so that the connection between the cutter and work rotations is not broken by pivotal movement of the arm 24. The relative directions of work and cutter rotation may be altered by the reversing mechanism according to whether internal or external gears are to be cut. The cutter is progressively fed to depth during operation by means of a depth feed cam 115, Fig. 7, which actuates a rod 117 pneumatically urged towards the cam and operating a pinion 126. The feed cam is driven from a branch train including change wheels 131, 132, Fig. 15, from the shaft 103. The speed of the feed cam is such that at least one complete revolution of the work occurs after full depth is attained and before the cam reaches its return portion. The depth feed bar also serves for adjustment of the saddle, and for this purpose is engaged by a nut mounted in the saddle and rotated by a manual control shaft. The cutter is relieved from the work on its return strokes. For this purpose the usual guides 148, 149, which are straight or helical according to the type of gear being cut, are connected to the worm 92 through ball-and-socket members 150-152 and pins 153, and the spindle has clearance in the sleeve 72 so that it may swing about a centre A. The lower part of the spindle is centred during cutting by a sleeve 156 having a conical portion, the sleeve being withdrawn by a cam 158 and lever 159 to permit a spring 160 to push the spindle aside to produce the relief. The driving train for the cam 158 is actuated from the crankshaft 53 through the gearing shown in Fig. 15 and including a long shaft 169 parallel to the arm 24. Specification 600,927 is referred to.