Patent GB-1349327-A (GB)
Title: Machine for processing oppositely facing surfaces of a curved bowl portion of a workpiece
IPC: B24B19/00
Filed: 1972-03-03
Abstract: 1349327 Polishing CLAIR MFG CO Inc 3 March 1972 [14 Oct 1971] 10151/72 Heading B3D A machine for performing a processing operation on oppositely facing surfaces of a curved bowl portion 15 of a workpiece 16, such as a spoon or fork, between tip end 15a and heel end portions of the bowl comprises a pair of parallel bowl portion surface processing rolls 12, 14, a holder 114 for supporting the workpiece adjacent an end thereof remote from the bowl portion, and means for supporting the holder for free pivotal movement about an axis parallel to the axes of the rolls and for moving the holder axis back and forth along a curvilinear path to cause the curved bowl portion to pass in and out between the rolls, and tipping means driven by the drive means for pivoting the work-holder about the axis to force the tip end portion into engagement with one of the rolls each time the work-holder is moved to pass the tip end portion out from between the rolls. The roll 12 is of smaller diameter than roll 14 and each roll is carried at its ends by respective arms 18, 20 connected to shafts 22, 24 which are supported in pedestals 26, 28 and geared together for movement towards and away from one another by movement of a lever 34 connected to a fluid cylinder 36. Each roll is connected by a belt drive to a respective electric motor 38, 40. A carriage 50 is reciprocatable by a fluid cylinder parallel to the axes of the rolls and has a pair of standards 54, 56 formed with slots 58, 60 for guiding slide bars 62, 64 fixed to work-holder operating assemblies 66, 68. The bars, with the assemblies, are reciprocatable transversely to the rolls by gears on a shaft 20 rotatable by a hand wheel 72. Each assembly 66, 68 has upper and lower meshing gears 78, 80, 82, 84, the lower gears being coupled by a shaft 86, and the upper gear 78 is connected to an oscillating fluid motor 88 controlled by pins 92 actuating a reversing valve 94. Stub shafts 100, 102 extend from the upper gears and are connected to brackets 104, 106 formed with grooves 110 for receiving pins 112 of the holder 114 for gripping the handles 115 of the workpieces 116, the holder being freely pivotable about the axis of the pins and the axis being movable along the curvilinear path I, . . . VII so that the bowl portions pass in and out between the rolls. The holder has upper and lower clamps 124, 126 carried by pneumatically operated hinge devices 121, 123. Handles 128 are provided for manipulating the pins 112 of the holder into the grooves 110. In order to force the tip end portions 15a of the workpiece into engagement with the lower roll as the workpieces are withdrawn from between the rolls, one, or as shown two, tipping arms 130 are secured to shaft 86 and engage rollers 138 secured to the lower clamp bar 126 of the workholder 114. As the brackets 104, 106 are pivoted away from the rolls 12, 14 to withdraw the workpieces, the arms are swung upwardly to engage the rollers 138 and pivot the work-holder about the axis of the pins 112 so that the tip end portions 15a of the workpieces are pressed against the roll 14. In other embodiments, the arms 130 are resilient or in two parts resiliently interconnected.