3. Printing Apparatus.—A side view of this machine is seen in Fig 9. and a section through its middle lengthwise in Fig. 10, where a is the table to hold the form of types, b the platen, c the inking rollers, and d, and d 1, the friskets. The machine is moved by a handle and fly-wheel, on the axis of which are the pulleys e, from which cords pass to f, and front f an endless chain extends to a pulley at the re verse end of the machine. This chain, attached to the frame of the inking rollers, draws them, by alternate revolutions of the pulleys e over the table and form of types a. These movements of the inking roller are produced by a pecu liarly formed endless screw (on the axle of the pulleys e) with a cross thread, into which a tooth works on the under side, and causes the screw to slide backwards and forwards laterally, locking alternately into one of the pulleys e. The ink is taken up from the ductor g, and is distributed on the peripheries of the rollers by the table h, which slides late rally.
The motion of the handle having passed the inking rollers over the types, the roller frame at the end of its course strikes a slider i, which brings quickly forward the frisket d with a sheet of paper under the platen, so as to receive the pinch of the press.
The table carrying the types, and balanced by the weight j, rises and falls by jointed pieces k, and is guided by cy lindrical sliders, working in sockets 1, 1. The fly-wheel, by striking a small lever, locks the cam in to the shaft of the fly-M heel, and causes the cam to go round with it. The
larger diameter of the cam pressing against the jointed pieces k, brings them almost into a vertical position, in consequence of which the table is raised with great force against the platen, and the impression given to the types. As the cam revolves, the jointed pieces k fall back, and the table descends. In order to take off the printed sheet, a pair of broad nippers o are attached to cords coiled round the wheels n, n, and driven by the pulley f when the roller frame c advances. As the roller frame c returns to ink the types, the nippers take hold of the edges of the paper and draw off the sheet, and by pressing against an inclined plane the chop:, of the nippers open, and deposit the sheet upon the heap at p.
The inking rollers having inked the types, and the frisket d having been thus withdrawn, the second sheet of paper is placed on the frisket d 1, and is printed as former ly, In this way the machine prints alternately sheets laid on at either end of the machine.
After the types have been used and the requisite num ber of impressions taken from them, instead of being dis tributed, they arc put into the melting pot and recast by the first apparatus.
We expect to be able to give some further details re specting this machinery in the description of the plates at the end of the volume. See Newton's Journal of the 4rts, vol. vi p. 225, 281, Sec.