| 摘要 |
1,030,407. Making closures for can ends. CONTOP Inc. Nov. 23, 1962 [Nov. 24, 1961], No. 44418/62. Heading B3A. [Also in Divisions B2, B4, B5, B6 and B8] Can end blanks are supplied in pairs on guide members 391, 417, 418, forming part of a reciprocable shuttle, to pairs of dies, the first pair 532, 533 embossing instructions on each blank and the second pair, which are compound dies, Fig. 34 (not shown), having parts arranged to cut interrupted lines and a tear tab, and to form embossed ribs on the blanks. The die plate 525 of the first pair is vertically reciprocable on posts 361 by means of gearing 492, 495, and a shaft 497 with an eccentric end 500. The compound dies, to which the shuttle next delivers the pairs of blanks, have each a male die 566 and a vertically reciprocable female die 604. The male die 566, Fig. 35 (not shown), has a cutting edge 570 interrupted at 571, cutting edges 572, depressions 574, and a U-shaped cutting edge 575 within which a pressure pad 580 is urged upwards by a spring 594. A member 596 has a dished upper surface for forming a rib on the tab of the finished closure. The pad 580 strips the can end blanks from the male die. The blanks may be formed of steel, aluminium or plastics material. Punching and forming fragible sheet.-Vertically reciprocable dies 1283, 1284, Fig. 73, cooperating with die rings 1405, 1406 cut out discs from aluminium foil or thin gauge plastics sheet drawn through the die mechanism by means of reciprocable grippers 1042, Fig. 65 (not shown). An upper die plate 1280 is cam-operated through a lever 1313 to rise and fall in timed relation with an intermittently rotated turret mechanism comprising a pair of castings 1580, 1581 each carrying a radially reciprocable chuck 1600, Fig. 88 (not shown). Bores 1410, 1411 in each die are connected to a source of fluid pressure, thereby enabling the cut-out discs to be forced from the dies into the waiting chucks. Stripper rings 1300, 1302 force the residual sheet from the dies. Each chuck, after further rotation to a position B, Fig. 85 (not shown), acts as a female die against which a male die 1750, Fig. 104 (not shown), operates in order to form the disc with a central depression and a peripheral flange. The face of the chuck is perforated as at 1621 and is connected to a source of vacuum by means of a fitting 1555, the vacuum thereby holding the cut-out disc in position and stripping it from the die 1750. As the chuck rotates further towards a 6 o'clock position, the vacuum is cut off and fluid pressure is applied to the chuck interior to release the formed disc. |
