Patent GB-1287777-A (GB)
Title: Improvements in or relating to powder compacting apparatus
IPC: B30B11/02
Filed: 1969-10-24
Abstract: 1287777 Powder compacting press WOLVERINE-PENTRONIX Inc 24 Oct 1969 [31 Oct 1968] 52111/69 Heading B5A [Also in Division C1] A press for moulding powdered metal, ferrite, or glass articles e.g. pharmaceutical pills, ball point pen balls, or porous bearings or bushes, in a die, or preferably simultaneously in a plurality of circularly arranged dies 60, Fig. 9, e.g. eight, by compaction between an anvil and an upwardly displaceable compression and ejection punch 100, includes a cylindrical hopper 164 which is arcuately reciprocable about its axis sequentially to position above each die adjacent portions of its annular base 180, providing die filling orifices 188, communicating the hopper 164 to each die 60, anvil portions 190, Fig. 11, and radially extending passages 192, Fig. 13, through which articles ejected by the punch 100 are delivered e.g. to a common container, or each to individual containers. In the Fig. 13 embodiment, the articles are delivered from the passages 192, into aligned tubes around the periphery of the base 180, by compressed air supplied to the inner end of the passages 192 from a tube 186 extending centrally of the hopper 164. Alternatively, Fig. 14 (not shown), the articles may be discharged through orifices in the die table 28, via an annular housing surrounding the base 180. Alternatively, Figs. 15 and 16 (not shown), the articles may be delivered mechanically on to the surrounding die table 28 by suitable curvature of the vertical wall of the discharge passage against which the articles abut upon the return movement of the hopper base 180. During the compression stroke of the punches 100, the hopper 164 is clamped against the die table 28 by an arm 170, Figs. 3 and 9, in which it locates at a spherical aligning bearing 168, which is fixed at its other end to a shaft 172 which is rotated to effect the clamping, by displacement of an arm therefrom by an edge cam 46 on a camshaft 36. The hopper 164 is arcuately reciprocated either by roller and slot, or toothed, engagement with a pivotable member e.g. 212 in Fig. 13, which is oscillated via a roller and slot connection, on one side thereof, to one end of an actuating lever which is freely engaged at its other end by a lever actuated by an edge cam 40, Fig. 7, on the press camshaft 36, and against which it is urged by a roller and slot connection of the member 212 on the other side thereof to a spring biased lever. The dies 60 e.g. of carbide, are housed in a plate 54, Fig. 9, of a removable capsule 32 which also houses stationary core rods 82, and the punches 100 which are slidable therearound. The core rods 82 are located for alignment with the punches 100 and die 60 through radially extending slots 80 of a sleeve 64, which is positionally adjustable in the housing 32 by a set screw 68 and also contains rods 78 which abut enlarged lower ends 84 of the rods 82 and are positionally adjustable by set screws 76 to adjust the axial position of the ends of the core rods 82 level with the die table surface. The punches 100 are carried by an actuating rod 88, which is slidable through the sleeve 64, in which they are located at enlarged lower ends 98, by snap rings 95, within an annular actuating rod groove 94 located between radially extending slots 92 permitting alignment of the punches 100 and cores 82. The punch actuating rod 88, Fig. 3, is connected for displacement to a rod 112 actuated by a lever 128, with one yoked end 126 whereof it engages at a sleeve 116 which is screw threadedly adjustable along the rod 112 to adjust the "eject" position of the punch 100, the "fill" position whereof is determined by a press frame abutment 114 engaged by an abutment 122 screw threadedly adjustable along the rod 112. The other end of the lever 128 is bifurcated at 132, 134, Fig. 7, to carry a cam follower shaft 136 which is urged by springs 138, 140 to bring the abutment 122 against the abutment 114 in the fill position, and to bring cylindrical and conical followers 146, 142 against edge cams 42, 44, respectively performing the ejection and compression strokes of the punches 100. The cam 44 is slidably adjustable along the shaft 36 to adjust the compression stroke of the punches 100, via the engagement thereof between the yoke 148 of a member which is screw threadedly adjustable along a shaft upon rotation thereof via gear connection to a hand wheel.