Journal (221, Nos. 7-12)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ...sufficient quantity of the clay for one set of fifty plugs to fall into the feed box P, in which it is distributed uniformly by the revolving arms Q. The bottom of the feed box is closed by two plates, perforated with fifty holes each, between which is a sliding plate B, also containing fifty holes, and worked by a cam on the main cam shaft. The holes in the bottom plate correspond exactly with the moulds in the moulding table, while those in the top plate are all set back a certain distance so as not to bo opposite the holes in the bottom plate; and the sliding plate R is made of such a thickness as to measure off in each hole the exact quantity of clay required for each mould. The clay falls first out of the feed box into the measuring plate, and the plate being then moved forwards by the cam shuts off the communication with the upper holes, and allows the charge to drop through the lower holes into the moulds beneath, as shown in Fig. 24. The charged moulds are then brought round under the pressing slide A and subjected to the pressure; after which the next stroke of the machine and rotation of the cam shaft lifts up the block G supporting the steel pistons in the bottom of the moulds, Fig. 24, and pushes out the newly moulded plugs to a level with the surface of the moulding table E; this is done by means of the vertical plunger T, worked by the levers S S, Fig. 21, which are actuated by a face cam on the outer end of the cam shaft D. The swivelling arm U, Fig. 23, actuated by another cam W, then sweeps the pings off the table E; and the same lever that works the swivelling arm withdraws at the same time the locking bolt V, which is provided for stopping the table dead after each turn and for holding it perfectly steady-during the time that the clay is ...