Patent GB-935801-A (GB)
Title: Improved work transfer mechanism
IPC: B23F23/04
Filed: 1962-03-06
Abstract: 935,801. Gear-cutting. GLEASON WORKS. March 6, 1962 [March 9, 1961], No. 8673/62. Class 83 (3). A work transfer mechanism comprises a carrier 24 movable axially on a support 19 and rotatable by a link 64 engaging any one of a number of pivot-pins 66 arranged in a circle about the carrier-axis 18, and a guide 73 preventing rotation of the carrier in its rearward position, the carrier being rotated only on each forward stroke of the link. Bevelgear blanks on the holder 17 of a conveyer chain 15 moved in steps hydraulically are gripped at position G1 by jaws 37 on the carrier, advanced off the holders 17, turned about the axis 18 into alignment with the hydraulically-operated chuck 13 of a gear-cutting machine, moved axially into the chuck and relaxed by the jaws. A preceding pair of jaws 37 on the carrier simultaneously grips a finished gear in the chuck, advances it clear of the chuck and transfers it to the position G4, before moving it rearwardly and releasing it into a shoot. The carrier 24 is slidable on a fixed shank 22, Fig. 4, by hydraulic pressure supplied to a space 28 for forward movement of the carrier, or to a space 27 for rearward movement. A passage 32 in each of the three sides of the carrier receives pistons 33 connected to the jaws 37, which are spaced from the carrier by buffer spring-washers 44. Supply of the hydraulic fluid to the spaces 27, 28, the spaces 42 between the pistons 33 for releasing the grip, and to the spaces 43 behind the pistons is through a non-rotatable distributer ring 45 held on the carrier by a ring 67 carrying the pins 66. A rod 73 engages a locating hole 74 in the carrier as this is moved rearwardly in each of its angular positions, the carrier locating on the rod while the pin 66 is still engaged in the hole 65 in the link 64. The link 64 is pivoted on the end of an hydraulically-operated plunger 61 and tends, due to its weight, to turn clockwise about the pivot 63, bringing a pin 71 on the link against a cam 72 to align the hole 65 with the next pin 66 in the carrier on return movements of the plunger 61. Forward movements of the plunger end with a surface 68 on the link 64 in engagement with one of the pins 66. At the completion of each gearcutting operation, an automatic-stop switch operates a solenoid valve to release the chuck 13 and close the jaws on the finished gear and a gear-blank on the conveyer chain. After a short interval, another solenoid valve operates to advance the carrier, engaging a pin 66 in the hole 65 when a lateral peg, Fig. 1 (not shown), on the distributer 45 closes a switch. This actuates a solenoid-valve for indexing the carrier. At the end of this stroke, an abutment on a rod (Fig. 1) connected to a crosshead 59 on the plunger 61 closes a switch on the cylinder 54 to reverse the valve controlling the hydraulic connections to the cylinder-spaces 27, 28. This retracts the carrier, inserting the blank in the chuck and causing the lateral pin on the distributer to close a further switch which effects opening of the jaws 37 and closing of the chuck. This restarts the machine and the conveyer 15. The lateral pin engaging a slot in a bracket (not shown), prevents rotation of the distributer.