Patent GB-464183-A (GB)
Title: Improved machine for producing gears
IPC: B23F1/04
Filed: 1936-08-05
Abstract: 464,183. Gear - cutting. GLEASON WORKS. Aug. 5, 1936, No. 21596. Convention date, Sept. 9, 1935. [Class 83 (iii)] In a machine for cutting bevel or hypoid gears by two reciprocating tools cutting opposite sides of the teeth, the reciprocating tool slides are mounted on supports which at the ends of the strokes are movable simultaneously in opposite directions at right-angles to the slide movements to move the tools to and from cutting position. The machine comprises a tool cradle 11 having full circular guide surfaces 12, 13 and held against axial movement by retaining plates 24. The cradle carries tool-holding rocker members 18, 18<1> having arcuate surfaces engaging the internal cradle surface at 19, 20. These members carry similar rams 25, 25<1> reciprocating parallel to the cradle axis and provided at the front end with dovetail guides 27 carrying tool slides 28, 28<1>. Slide 28 carries a longitudinallyadjustable plate 30 on which is mounted a tool-holder 36 adjusted longitudinally and laterally by screws 31, 37 and secured by bolts 33. The tool T is secured to the tool holder by screws 38, wedges being provided to adjust the tool for pressure angle. The lower tool-slide carrying tool T<1> is similar to that above described and the slides are reciprocated from a motor 140 connected through bevel gearing 142, and spur gearing 46 to a crank shaft 47 mounted in bearings in the cradle. An eccentric reduced portion 57, forming the crank is connected by a link 58 to a shaft carrying an arm keyed on a shaft 65 formed with an enlarged head 70. This head is slotted and carries radially-adjustable blocks provided with pins 73, 73<1> on which are pivoted blocks 83, 83<1> engaging slots in the tool slides so that the oscillation of the shaft 65 reciprocates the tools, one cutting while the other is being returned in its relieved position. The movements of the rams 25 are controlled from a cam 75 engaging anti-friction rollers 77, 771 on the respective rams. The cam has a rise and return separated by two dwells so that a ram is first actuated to move the tool to cutting position and maintain it there during the cutting stroke after which the tool is withdrawn and kept in the relieved position during the return stroke. The rams are mounted on anti-friction roller bearings and are held against the relieving-cam by springs. The depth feed of the tools into the blank is effected by a cam 100 rotatable on ball bearings on the shaft 47 but held against axial movement thereon. A roller 105 engaging the cam is mounted on a stud 106 secured to the housing 53 through an eccentric device which may be adjusted to move the feed cam 100, the shaft 47, and the rams axially to determine the depth of feed. The cam 100 produces successive feeds to full depth, a dwell while the tooth sides are generated, then a withdrawal and a dwell while the blank is indexed. Positive stops, comprising blocks 90, 90<1> secured to the rams limit the forward movement into the work, by engaging studs 18, 18<1>. The cam 100 is driven from a shaft 187 through bevel gearing 188, shaft 125, worm gearing 127, and spur gear 128. The oscillation of the cradle is derived from a cam 216 also driven from shaft 187, and actuating lever mechanism, Fig. 2, connected to an arm 136 extending from the cradle. The members 18, 18<1> are angularly adjusted to the taper of the gear tooth by segments 150, 150<1> engaged by pinions carried on stub shafts 152, 1521.