Patent GB-1097369-A (GB)
Title: Automatic processing apparatus
IPC: B24B9/16
Filed: 1965-12-07
Abstract: 1,097,369. Lapping diamonds. INTERNATIONAL STANDARD ELECTRIC CORPORATION. Dec. 7, 1965 [Dec. 24, 1964], No. 51806/65. Heading B3D. Automatic apparatus for processing articles (e.g. lapping facets on diamonds) includes (1) a support member having a plurality of holders arranged in a circle; (ii) first displacing means for displacing said support member so as to bring an article in one of said holders into operative engagement with processing means (e.g. a lapping disc) and for displacing said support member so as to move said article out of operative engagement with said processing means; and (iii) second displacing means for rotating said support member so as to bring a further one of said holders into alignment with said processing means, whereafter said first displacing means can bring an article in said further one of said holders into operative engagement with said processing means, so that a plurality of articles each in me of said holders can be successively processed by said processing means; each said rotation of said support member being accompanied by an individual rotation of each said holder, so that in successive rotations of said support member different portions of each said article can be subjected to processing operations, and the number m of said article holders and the number n of times an article in one of said holders has to be processed are prime with respect to each other, so that all said articles are processed after mn successive processing operations. Apparatus for lapping four flat faces on each of nine diamonds has a housing (1) formed by a substantially U-shaped bracket (2) to which a cover (3) is secured. A part (27) secured to the bracket (2) is pivoted about an axis formed by pin ends on screws (23, 24) fixed in parts (13, 14) of a plate (11). The plate (11) is supported by a cylindrical roller (10) on a block (6) secured to a base 5; pivotal adjustment of the plate (11) about the roller (10) is effected by screws (17, 18) near the ends of the plate (11). An electric motor (47) (LIFT MOTOR) is horizontally adjustable on a support plate (38) secured to the bracket (2). The motor (47) drives, through gearing (51, 53, 58, 59, 61, 62), a shaft (63) which makes 1/ 36 th of a rotation for each rotation of the motor shaft; the shaft (63) carries a cam (65) operating a micro-switch (66) carried by the housing (1). The motor (47) also drives, through gearing (51, 53, 55), a shaft (56) which makes one rotation for each rotation of the motor shaft; the shaft (56) carries cams (74, 75, 76, 77). The cams (75, 76, 77) operate micro-switches (88, 89, 90) carried by the housing (1). The cam (74) co-operates with a roller (98) mounted in the end of a pusher element (96) retracted by a spring (97). The pusher element (96) is slidably mounted in a hollow arm 102 secured to the bracket (2) and has a flat part 100 with an inclined lower surface 101. The flat part 100 is located between the parallel arms of a U-shaped part 115 integral with a rod 116; a roller 117 mounted in the part 115 is urged into contact with the inclined surface 101 by a spring 119 located in a housing 109 secured to the arm 102. A roller 213 is carried by the lower end of the rod 116. Below the roller 213 is a flat knob 120 with a threaded stem 121 screwed in a member 122 screwed on the upper end of a housing 123 secured to the base 5. The arm 102 is supported by a roller 125 carried by the upper end of a rod 126 urged upwardly by a spring 139 in a housing 129 secured to the base 5; the spring loading is adjustable by a knob 136. A support 140 is secured in the hollow end of the arm 102 by a piece 141 and a knob 142. Between the parallel arms of the U-shaped end of the support 140 a support 143 is fixed by an element 144 ; for adjusting the height of support 143 before fixing it, a screw 145 mounted in the arm 102 abuts against an extension 146 of support 143. A part 147 rotatably mounted in the support 143 has a downward extension 148 connected by a pivot pin 149 to a bracket 150 secured to a disc (155). The inclination of the disc (155) to the axis of the part 147 is adjusted by a knob 153. The disc (155) is integral with a plate 159 on which is fixed a speed reducer 160 driven by a SHIFT MOTOR 162. The speed reducer 160 drives a disc (171), the periphery of which has a recess and is engaged by a roller (184) on the armature (183) of a microswitch (181). Secured to a support plate (173) mounted in a cup member 157 secured to the disc (155). The disc (171) has a stud (172). A Geneva cross (187), having nine slots (242), is secured to a shaft 190. A gear-wheel (192) is secured in a central opening in the bottom plate (177) of the cup member 157. An arm (195) pivoted on the bottom plate (177) is loaded by a spring (197) to maintain a roller (198) on the arm in contact with the Geneva cross (187). A disc 200 is keyed to the shaft 190 of the Geneva cross (187). The disc 200 has nine circular openings (205) in each of which is mounted by ball bearings (208, 210) a carrier for a diamond holder, the carrier comprising a threaded cylindrical part (206) with an integral gear-wheel (207) and with longitudinal slots (223, 224) spaced by 45 degrees. A stop pin (212) is secured within the cylindrical part (206). In each cylindrical part (206) is fixed, by a clamping nut 211, a diamond holder comprising a slotted rod 218, the end of which receives a diamond, a piece 220 having a frusto-conical head and a hollow cylindrical rear part, and a cylindrical part 221 having a stud (222) for selective engagement with the slots (223, 224). The end of the slotted rod 218 abuts the stop pin (212). Operation.-At the beginning of a cycle, arm 102 is in its upper position, the inclined part 101 of pusher element (96) being in its extreme right-hand position and roller 213 in contact with knob 120. On depressing start knob (34), the lift motor (47) is energized. Part 101 of pusher element (96) is moved to the left and roller 213 is displaced upwardly. The whole apparatus pivots clockwise, the arm 102 abutting the roller 125 and the diamond in one holder 217 coming into contact with the lapping disc 227 which laps a first flat face thereon. Lift motor (47) is de-energized. When the rod 218 of the holder 217 contacts the lapping disc 227, a circuit is made which energizes the lift motor (47), whereby the apparatus is pivoted anticlockwise lifting the diamond from the lapping disc. The shift motor 162 is energized and the disc 200 is rotated through 40 degrees, the holders 217 being simultaneously indexed through 90 degrees. The shift motor 162 is deenergized. The arm 102 performs a second downward movement and a first flat face is lapped on the diamond mounted in a second holder which has been brought into the position previously occupied by the first holder. The cycle continues, a first flat face being lapped on all nine diamonds, then a second flat face on all nine, then a third flat face on all nine, and finally a fourth flat face on all nine. The cycle then stops, a lamp (35) is lit and the lift motor (47) is stopped with the arm 102 in its upper position. The stud (222) is then moved from slot (223) to slot (224) and four more flat faces lapped on all nine diamonds.