The Cottrell Slop-cyeinder Press contains many patented improvements which are distinct ive features. The frame is cast smooth inside and out, without flanges. The bed has four bearings under the impression and runs upon hardened steel rollers. A solid girt is bolted to the bed-plate crosswise of the press, and extends up to and supports the tracks, thus making nearly a solid mass of iron directly under the cylinder in line with the impression. The cams for operating the cylinder have been considerably enlarged, thereby imparting an easier motion to the cylinder when stopping and starting. This change admits of the press being run at a much higher rate of speed. The feed guides have been removed from the feed board, where so many disturbances are liable to affect the register, and have been placed in the cylinder itself and revolve with it. The angle of the feed board has been so changed that the sheet is in nearly a horizontal position when fed to the guides, thus preventing any " buckle " in the sheet when the grippers close on it. This press is also arranged with the trip at will " feature, enabling the feeder to throw off the impression if a sheet is not fed properly to the guides, also enabling him to roll the form any number of times to each impression. By means of a reverse motion, the feeder is able to " back up " the press with out leaving his position on the platform. The patent ink-roller frames admit of the vibrators and distributors being easily raised clear of the form rollers, leaving them free for removal. The whole system of rollers can be handled at one side of the press, econo mizing both time and wear.
Potter's Newspaper Press (Fig. 7).—This quarto and folio press takes paper from a roll, prints from stereotype plates, and cuts, pastes, and folds, as may he desired, at the rate of from 10,000 to 12,000 eight-page newspapers an hour, or double that number of four page papers an hour. The printing machine, folder and delivery mechanism are all contained in a single frame. The web, printed on both sides, leaves the second im pression cylinder and passes directly into the cutting and folding cylinders ; or it may pass over a turning bar and be turned laterally into the folding and cutting cylin ders, and thence to the vi brating folder, whence the folded papers are delivered into the packing box, from which they may be readily taken by the pressman. When an eight-page paper is to be printed, the web is split in the center and each half of the web is turned round separate turning bars, so that the two webs are brought one under the other, and in this shape the super imposed webs are led to the cutting and folding cylin ders as before. From the nature of the machine, and by a slight change in the ar rangement of the mechan ism, any variety of product can be produced. Thus, the papers may be folded once or twice; and being folded twice longitudinally, may be fold ed crosswise; and by dupli cating the cylinders for dividing the web, folio sheets can be delivered from the press as readily as can quartos.
A Web Perfecting Press, built by Messrs. Cottrell & Sons, for the Youth's Com panion newspaper, employs a novel shifting tympan. The press prints from a web of paper that is led between the first type cylinder and the impression cylinder, and thence in contact and be tween a second type cylinder and a second impression cyl inder, which latter is twice the circumference of the first. The second impression cylin der carries two sets of tympans. These tympans consist of a web of fabric held by rolls in the cylinder, which are shifted automatically over the surface of the cylinder the length of a sheet every 50 or 100 impressions. thus presenting an entirely fresh offset surface. The time at which the automatic shifting of the tympan occurs may be regulated to suit the matter being printed, and the extent to which offset occurs in practical use. From the second impression cylinder the web, printed on both sides, is led to a traveling gripper band, which in turn leads the web between a pair of cutting cylinders to sever it into sheets, and the grippers of the band take the sheet from the cutting cylinders and at the proper time release it so that it may be deposited with the pile on the piling table.
The Iloe Single Web Perfecting Press has two form cylinders, each carrying four pages of a newspaper, print ing two complete copies of a four page paper at each revolution—speed, 24,000 per hour—or the eight plates many be so arranged on the two cylinders as to print one eight page paper at each revolution—s peed, 12,000. Papers are delivered. fol d e d, and counted auto matically.
The floe Three page-wide Press has two form cylinders, each carrying three plates lengthwise of each cylinder and two around it. The following prod ne tions result: From a two-page-wide web, printing from only four plates on each cylinder, 24,000 four-page or 12,000 eight-page papers per hour. From a three-page-wide web, printing the whole width of the ma chine, 24.000 six page or 12,000 twelve-page papers per hour; eight and twelve-page papers resulting from the gathering, by means of the floe collecting cylinder, of 2 four page and 2 six-page papers respectively, containing different matter. On this ma chine the six-page papers are made by slittingthe web, after being printed on both sides, and turning the result ant one - page - wide web by means of "turning bars" placed at the proper angle, and so di recting it under the two-page wide web, just before it enters the folder, that the single sheet is folded inside of the two-page-wide one and seem A down the center margin of the latter by a line of paste. This three-ply web is cut transversely, folded, and delivered exactly as a four-page paper would be.