Patent GB-997928-A (GB)
Title: Article transfer mechanism
IPC: B65G47/24
Filed: 1963-12-17
Abstract: 997,928. Article transfer apparatus. MONSANTO CO. Dec. 17, 1963 [Dec. 17, 1962], No. 49700/63. Headings B8A and B8H. An article transfer mechanism comprises a transfer arm assembly 2 mounted for oscillation about an axis 3, an article carrying assembly 4 mounted for oscillation about an axis 5 which is parallel with the axis 3 drive means for oscillating the transfer arm assembly 2, means for maintaining the article carrying assembly 4 parallel to its horizontal article pick-up position for the arcuate travel " X " Fig. 2 (not shown), of the transfer arm assembly 2 and parallel to its vertical article delivery position for the arcuate travel " Z," Fig. 4 (not shown) of the assembly 2 and means for turning the article carrying assembly 4 from the horizontal pick-up to the vertical delivery position and back again during the intermediate arcuate travel of the transfer arm assembly 2 through the distance " Y," Fig. 3 (not shown), forward and back respectively. The transfer arm assembly 2 is mounted between housing sides 1 slidably mounted on a base 9 which in turn is slidably mounted on a vertically adjustable base 17. The assembly 2 comprises two arms 22, 26 rigidly coupled by bars 55 and 30 and rotatably mounted in bearings 23 in the housing sides 1. The arm 22 is rigidly mounted with a pinion 31, Fig. 5 (not shown) at one of the bearings 23, this pinion 31 being driven by a vertically reciprocating rack 32 to effect oscillation of the arm assembly 2. The rack 32 engages a toothed sector gear 35 which is oscillated about an axis 36 by an hydraulic ram 37 anchored to the housing 1. The end of the piston rod 40 of the ram 37 is adjustably clamped 42 in an arcuate slot 107 in a drive arm 43 which is adjustable about the axis 36 and is clamped to the sector gear. Tension springs 45 attached at one end to the housing are connected at their other ends to the arms 22, 26 to aid the initiation and to damp the termination of the oscillations of the arm assembly 2. An hydraulic snubber 50 is connected between the rack 32 and the housing to prevent excessive or erratic travel of the rack. The article carrying assembly 4 comprises a row of axially spaced article gripper assemblies 6 each of which is secured via a clamp 61 to a cylindrical shaft 56 which is coaxially and rotatably mounted on the bar 55 of the transfer arm assembly 2. A sprocket 83 secured to the shaft 56 engages a tensioned chain 86 which is driven by a sprocket 84 mounted on a shaft 85 coaxial with the axis of oscillation 3 of the arm assembly 2. The remote end of the shaft 85 has a gear wheel 88 secured thereto which engages a further gearwheel 89 mounted on a shaft 90. Radial arms 94 and 96 are secured to the shaft 90 at 90 degrees to each other and at the outer end of each is a roller cam follower 95, 97 which engages cam plates 92, 93 attached to the reciprocating rack member 32. The rollers 95, 97 engage the transverse cam surfaces 92a, 93a to effect the reorientation of the article gripping means during the intermediate arcuate travel of the transfer arm assembly and the rollers are held by means of threaded abutments 102, 103 in contact with the vertical profiles of the cam plates thus maintaining the article holding devices in either the horizontal or vertical positions, during the initial and terminal portions of the travel of the transfer arm assembly 2. Each gripper head, Fig. 9, comprises a fluid actuated ram 59 and a pivoted jaw assembly 60, both mounted on the frame 61. The piston 63 of the ram is pivoted 71 via a toggle block 64, at its outer end, to a pair of operating links 69, 72 which at their outer ends are pivoted 70, 70a to jaws 66, 67 of the gripper head. The jaws are pivotally mounted together and to the frame 61 at a point 68. In operation the piston of the ram is extended against a return spring to close removable portions 66a of the jaws 66, around the neck of the article 7. Pressurized fluid is supplied to the gripper heads by conduit 76 which is flexibly coupled to a supply source. U.S.A. Specification 2,623,648 is referred to.