USRE6760E - Improvement in printing-presses - Google Patents

Description

J. L. NRM.

l PRINTINGPRESS.

Reissuea Nov. ze, 1e75.

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wkkwemem UNITED STATES PATENT OEEICE.

JOSEPH L. FIRM, OF NEW YORK, N.V Y., ASSIGNOR OF ONE-HALF INTEREST TO CALYERT B. CTTRELL AND NATHAN BABGOCK.

IMPROVEMENT IN. PRINTINGPRESSES.

l Specification forming part of Letters Patent No. 146,441, dated January 13, 1874; reissue No. 6,160, dated November 23, 1875; application filed July 24,1875.

To all whom it may concern Be it known that I, JOSEPH L. FIRM, of New York city, in the State of New York, have invented-certain new and useful Improvements in Printing-Presses; and I do hereby declare that the following is a full and exact description thereof, reference being hadto the accompanying drawings and to the letters of reference marked thereon.

My invention relates to certain new and usefulimprovements in printing, and in presses designed for printing onpboth sides of the sheet which passes through the machine; and my invention consists in the use, in combination with the usual impression-cylinder and fiat form on atraveling bed, of a curved form and auxiliary impression-cylinder, the whole so arranged and operating together that the sheet fed into the machine will be first printed on one side, during its passage between the curved form and auxiliary 'impression-cylinder, and then'pass directly onto the main impression-cylinder in such a position as to travel with it in contact with theusual fiat form, and have its other side printed, slipsheets77 being properly introduced between the said impression-cylinder and first printed side of the sheet, to avoid any oli'set,77 all as will be hereinafterI more fully described;`

and my invention further consists in feeding the slip-sheets used on the impression-cylinder directly to the gripers, instead of passing them first between carrying-tapes, whereby all liability of creasing and crinkling the slipsheets is avoided, as will be hereinafter more particularly described; and my invention further consists in taking the slip-sheets away from the cylinder, by means of gripers, in lieu 'of leading them oli' by carrying-tapes, whereby less wear and tearof the slip-sheets occur, and the removal of the slip-sheets may be effected at different times, relatively to the rotations of the cylinder, as will be hereinafter described.

To enable those skilled in the art to make and use my invention, I will proceed to more fully explain its several features and the construction and mode of operation of a machine embracing the several features of my improvements.

In the accompanying drawings, I have shown, in vertical longitudinal section at Fig. 1, and in top view at Fig. 2, so much of a printing-press as is necessary to fully illustrate my invention.

A represents the usual form-bed, and B the impression-cylinderof a printing-press, said cylinder and bed having the usual rotary and reciprocatory motions, respectively, and the latter carrying the ordinary fiat form a. Some distance above the bed A, and adjacent to the impressioncylinder B, are arranged, as shown, close together, two cylinders, C and D, the first of which carries a curved form, c, while the latter is adapted to act in conjunction therewith as an impression-cylinder. E is the feed-board, from whichthe sheets of paper c to beprinted are fed into the impression and form cylinders D G, of which D is pro# vided with gripers d, such asare usually employed to take hold of the sheet fed to them, and carry it along with the cylinder. F is the slip-sheet feed-board, from which the sli p-sheets fare fed to the impression-cylinder B. This cylinder is provided with the usual gripers g, and the slip-sheets f are fed directly from the board F to these gripers, in lieu of first passing along between ca1rying-tapes.l

H H represent the tapes which serve to hold the slip-sheets onto the face of the cylinder B until they are taken olf by the gripers i of a griper-cylinder, I, over which, and a drum, J, pass auxiliary endless bands or tapes b, onto which the removed slip-sheets are passed, and from whence they are taken off on the iiy K. The tapes H are carried around out of the way, and over and under the drums l, 2, 3, 4, 5, J, I, 6, and 7, in the manner illustrated clearly in Fig. 1. M N are two drums, carrying the bands L), onto which the printed sheet is carried, and from whenceit is removed in the usual manner. by a fly, P.

. The foregoing description of the several parts, their offices, and arrangement, together with the following brief explanation, will suffice to give a clear idea of the mode of operation of a machine constructed upon my improved plan.

The sheet of paper e, being fed to the gripers dof the impression-cylinders D as the 1atone side is being thus performed a slip-sheet,

f, `is fed to one set of the grpers g of the main impression-cylinder B, and is carried round with said cylinder, and between its face and the tapes H, in such a manner and time that the advance edges of the sheet e and slipsheet f will arive about simultaneously at the point where the impression-cylinders D and B arel about tangential. Arrived here, and as the sheet e is leaving the form O, the other set of the gripers g take hold of the sheet e and carry it from the cylinder D to B with its printed surface in contact with the slip-sheet, to prevent any offset, there being, as seen, two sets of gripers on the main cylinder B, so that one set may hold and carry around the slip-sheet two or more times, irrespective of the action of the other set. The sheet e now passes 'along in contact with the flat form a, by which its lother side is printed in the usual way, and thence between the tapes H and the periphery of drum M downward onto ythe bands 0, from whence it is removed in usual manner, and printed on both sides by the fly P. As the printed sheet e passes over the drum M it parts company with the slipsheet f, which latter travels on with'the inipression-cylinder B until it is taken therefrom by the grip'ers i of the griper-cylindcr I, when it is carried along on top of the tapes b, and from them taken off by the Hy K.

It will be understood that by a suitable ,means for regulating the operation of the Vmechanism actuating the gripers the machine may be set to either have the gripers v1 remove the slip-sheet during its first passage round with the impression-cylinder B, orto have them only operate after the `slip-sheet shall have traveled round two or more times.

When it is remembered that the slip-sheet can just as well, with most kinds of work, be permitted to tra vel more than once, and that thereby the feeding of the slip-sheet is reduced to such slow work that it can be done by a slow hand, the advantage of thus permitting the slip-sheet to pass on round more than once', whch'it cannot ,do when itis carried olf by tapes, will bey appreciated.

The great advantage and importance of the removal of the slip-sheet (at any time) by a positive means or device, such as a griper, lies in the fact that by such positive means all possibility is avoided of a failure to take `in this condition, cannot occur.

Another advantage gained by the use of a griper-cylinder to take oft' the slip-sheets from the impression-cylinder is, that the sheets are not so much mutilated, and so soon rendered unfit for use, as when carried oft' and discharged by tapes passing over drums in the necessary manner. Y

It will be seen that by feeding the slip-sheets from the stack or table directly to the gripers of the impression-cylinder the sheet will be laid smooth and taut on the periphery ofthe cylinder,'because it is drawn under some tension, from the hands of the feeder bythe gripers, while in the feeding in of the sheets by tapes priorto the' take-hold of the gripers the sheet is liable tov get creased and crinkled'in the tapes, and will remain so to the great detriment ofthe work being donev over it; and to the early destruction of the slip-sheet itself.A

The most desirable results are accomplished by thus entering the slip-sheets directly into a positive take-hold'device, such as a pair of gripers, in lieu offee'dingor passing them into the machine by any such uncertain means as have heretofore been employed.

Having so fully explainedthe construction and operation o'f the several parts of my invention that those skilled in the art of building and using printing-presses can readily make and useV my invention, what I claim as new, and desire to securev by Letters Patent,

l. The combination, with an impressioncylinder and reciprocating form, of au auxiliary impression-cylinder andcurved form, the whole operating together to print both sides ofthe sheet during its passage through the machine, substantially as set fortl1.

2. The described method of placing the slip-sheets on the impression-cylinder-that'is to say, by feeding them directly into the gripers of the impression-cyli'nder'by hand.

3. The described method of removing the slip-sheets from the impression-cylinder after they shall have been vused any desirable nurnber of times, as herein'beforeset forth.

In testimony whereof I have hereunto set my hand and seal this `13th day of J uly, 1875.

JOSEPH L. FIRM. [L. s]

In presence of- J. N. MGINTIRE, J Ao'oB FELBEL.

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