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THE NEW 125k PUBLIC LIBRARY

ASTOR, LENOX ART TILDEN FOUNDATIONS

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THE

London

JOURNAL OF ARTS AND SCIENCES.

No. XX.

Recent Patents.

To AUGUSTUS APPLEGATH, of Duke Street, Lett's Town, Lambeth, Surrey, for certain Improvements in Printing Machines.

UNDER this patent there are two improvements; the first of which consists in supplying the printing ink to the form of types, stereotype plates, or blocks, by two sets of inking rollers, acting partly on one side of the pressing cylinder, and partly on the other; by which means, as the form passes to and fro, it receives its supply of ink without being carried out to a considerable distance, as is the case in other printing machines, where the form is inked entirely on one side of the pressing cylinder, and where it must be made to travel with considerable speed in order to pass entirely under the inking rollers. By this improvement, the form traverses a shorter distance than usual, and, hence, the VOL. IV.

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number of impressions, produced in any given time, may be increased in the same ratio as the traversing distance of the form is diminished, by which a saving of time will be effected in the operation of printing.

The second improvement consists in the adapting and combining two paper-feeders with a printing cylinder, which revolves and prints in one direction only. This contrivance will be seen by reference to the diagram Plate IV. fig. 1. A, is the pressing cylinder which gives the impression; B, is the form of types passing to and fro under it; a, and b, are two light cylinders or drums, which are only half the diameter of the pressing cylinder; b, is connected, by means of toothed wheels and pinions, to the pressing cylinder; and a has also a toothed wheel upon its axle, which connects it with b. On the spindle of b, is a pinion, c, one-fourth the diameter of the drum, b. The toothed wheel, d, is loose upon its axis, and is driven by the pinion c, by which means it makes one revolution while the printing cylinder makes two: e, is a small stud or pin on the edge of the wheel, d, which is intended to strike alternately upon the arms, fand g, of two brass pulleys, h, h, so as to turn them partly round. These pulleys, h, h, are connected by bands to the web rollers i, i, to which the endless feeding tapes, k, k, are fastened; t, t, being check straps to limit the action of i, i.

By means of the stud or pin, e, the pulleys, h, h, are alternately moved, and the sheets of paper, p, p, laid upon the feeding tapes from the heaps, s, s, are thus brought forward towards the drums, a, or b, and enter at %, so as to be conveyed by the tapes down to the pressing cylinder, A, round the periphery of which they move, and become printed by passing over, B, the form of types below, and, thence proceeding on the tape over the roller, g, are discharged at r. When the

Applegath's, for Improvements in Printing Machines. 59

stud or pin, e, leaves the arm, f, or g, its pulley, h, and web roller, i, are carried back to their former position by the gravity of the weight, w.,, are two small web rollers, over which the feeding tapes, k, k, pass. At %, %, are placed several small thin bars of steel fixed to the web-boards between the intervals of the feeding tapes, and which extend to the drums. These bars are intended to support the sheets of paper in their progress between the feeders and the drums. m, is an angular guide bar of metal or wood, placed so as to guide the paper down between the drums when the upper or short sets of endless tapes, n, n, leave it. The small rollers, o, o, which guide the tapes, n, n, upward, are grooved in the intervals between the tapes to allow room for thin metal hoops to be bent round the rollers, o, and guidebar, m, to prevent the sheets of paper from catching against the edges of the bar.

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"By this second invention, the printing cylinder can be supplied with more sheets of paper in any given time, than when one feeder only is used; and thus advantage may be taken of the increased rate of printing, which is obtained by means of my first improvement."

To avoid confusion the whole of the printing machine is not shown in the figure, but only such parts as are necessary to elucidate this invention; and it is not meant to claim under this patent any of the various parts of those machines already known or in use; "but I do hereby claim as my invention the inking the form of types, plates, or blocks, partly on one side and partly on the other side of the pressing or printing cylinder; and the combination of two paper feeders with a printing cylinder which prints in one direction only."

Inrolled, May, 1822.

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