Patent GB-1283097-A (GB)
Title: Improvements relating to apparatus for transferring workpieces
IPC: B23F23/06
Filed: 1969-10-01
Abstract: 1283097 Workpiece transferring GLEASON WORKS 1 Oct 1969 [1 Oct 1968] 48239/69 Headings B3B and B3K Apparatus for transferring a workpiece, e.g. a bevel gear blank, from one station to another, e.g. between a conveyer and two spindles 10, 12 of a dual bevel gear cutting machine, comprises a loader and transfer means 16 having three arms radially disposed in a horizontal plane about a vertical turret 18, each of said arms being equally spaced 120 degrees apart and including work holders near their ends, means for lifting and lowering said loader and transfer means 16 and means for rotating said loader and transfer means 16 back and forth about a central vertical axis of said turret so that each arm oscillates between two stations, each of the work holders on each arm being a different distinctive type associated with its respective arm, the lifting and lowering and rotating of the loader and transfer means 16 and the work holders being sequentially operated to advance a workpiece through a series of stations which include at least one cutting operation. In a bevel gear cutting lay-out the stations may include two roughing machines; one roughing and one finishing machine; or two finishing machines, one for each side of a tooth. The stations will also include a workpiece conveyer take-off and return station and, where only a single cutting operation is provided, a dummy station. The sequential control is governed by cam apparatus 300. The vertical turret 18 of the loader and transfer means comprises a fixed casing 40 housing concentric shafts 44, 46 for raising and lowering, and rotating the arms 20. The raising and lowering is actuated by pressure fluid supplied via port 50 into an annular chamber 51 to raise the piston shaft 46, or supplied via a port 60 into annular chamber 58 to lower same. The movement of shaft 46 is hydraulically damped at the extremity of each stroke. A centre tube 48 supplies pressure fluid to actuate the work holders on each arm. The arms are rotated by shaft 44 which is oscillated, by a fluid pressure operated rack 92 and pinion 90, the rack being hydraulically damped at its end positions. The basic work holder H-1 comprises an annular centring cup 150 and a pair of jaws 152. A centre 172 initially engages a recess 176 to centre a workpiece. The jaws 152 are fluid pressure operated by a piston 194 to grip a workpiece and are spring biased to an open position. Further springs 166 allow the work holder to move axially relative to an arm when the turret is lowered to pick up workpieces. The work holder may be made rotational by means of a channel and anti-friction bearings 169. In a modified work holder (H-2) (Fig. 12, not shown), the centring cup 150 includes spring biased pins that extend into rough cut spiral teeth so that axial movement of the work holder rotationally orientates the workpiece to a required position. In a further work holder (H-3) (Fig. 14, not shown) for accurately orientating a workpiece for final gear finishing, the work holder is rotatable by a pressure fluid device against a spring bias, and adjustable stops are provided.