US169795A - Improvement in rotary perfecting-presses - Google Patents

Description

J'. L. FIRM.

ROTARY PERFECTING-PRESS.

Patented- No?. 9,` 1875.

JOsEPH L. FIRM, OF New YORK, N. Y.

, ASSIGNOBOF ONE-HALF HIS RIGHT TO GALVERT B. COTTRELL AND NATHAN BABGGK, OF WESTERLY, R. l.

IMPROVEMENT lN ROTARY PERFECTlNG-PRESSES.

Specification forming part of Letters Patent No. 169,795, dated November 9, 1875; application led August 12, 1875.

CAsn A.

To all whom it may concern:

Be itknown that I, JOSEPH L. FIRM, of the city, county, and State of New York, have invented certain new and useful Improvements in Rotary Perfecting-Presses 5 and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing which forms part of this specification.

This invention more particularly relates to the class of printing-presses known as perfecting-presses, in which the paper is fed from a continuous web or roll and is printed on both sides at one operation.

The invention consists in a cert-ain combination and arrangement of two pairs of cylinders or rollers, each composed of one form-cylder and one impression-cylinder, and an interposed series of cylinders or rollers composed of one form-cylinder and two impression-cylinders, in all making seven cylinders or rollers, arranged to print on both sides of separate continuous webs or rolls of paper, whereby not only power and space are economized and the amount of surface-travel of the cylinders is reduced, but also endless blankets for the impression-cylimlers operating also to act as conveyers of the paper from one series of cylinders to another are dispensed with, and the soiling of the webs of paper by ink transferred to the blankets is avoided.

Figure l represents a side elevation of a perfecting-press, in part, having my invention applied; and Fig. 2 a vertical section of the same in a plane parallel with Fig. l. Fig. 3 is adiagram, in illustration, of a modiiied arrangement of the form and impression cylinders. Fig. is alongitudinal View of one of the formcylinders and one of the impression-cylinders, with the bands on their surfaces which keep them-in contact.

The inking and other working devices of the press not necessary to illustrate the operation of my system of form and impression cylinders are omitted in the drawing, as also the devices for cutting the printed webs into suitable lengths.\`

A and A, in Figs. l land 2, are the paperrolls, from which the two rolls or continuous webs of paper a a are fed, as indicated in Fig. 2 of the drawing. 13,131, and B2 are the formcylinders of the press, and C, Gl, C2, and G3 are the impression-cylinders thereof. The web of paper a passes from the roll A over the impression-cylinder C and under the formcylin der B, to effect the printing on its one side or surface, and from thence passes over the formcylinder Bl and under the iml'iression-cylinder G1, to print the other Aside or surface of such sheet. The other web of paper, cf, passes from the roll A under the impression-cylinder CZ and over the form-cylinder B, to print its one side or surface, and from thence under the form-cylinder B2 and over the impression-'cylinder G3, to print its opposite side or surface. By these combinations of devices two important results are obtained, namely: first, the one form-cylinder 13,01' sin gle form thereon, and the two impression-cylinders U C2, serve to print the one side of two independent webs, a, a', as

the same are passed or drawn from their re,

spective rolls A A', which thing of itself is not claimed as new; and, secondly, the two independent webs a c are printed on both sides by meansof only three form-cylinders and four impression-cylinders, thus enabling the press to accomplish as much work in a given time as two ordinary perfecting-presses, and whereby weight, rst cost, working power, and space are economized, and the amount of surfacetravel of the cylinders is reduced 011eeighth as compared with two presses employing four form-cylinders and four impressioncylinders, and endless blankets for the impression-cylinders, also acting as conveyers of the paper from one series of cylinders to another, as in other arrangements for printing on both sides of independent webs, and which blankets, taking the ink from the one web and soiling or smearing the other web, are dispensed with. In such a double perfectingpress, also, there is the further advantage, when the same is employed for newspaperwork, of requiring only one stereotype form on the cylinder B for theilast side,77 instead .of duplicate forms thereof on separate cylinders, thus saving time, labor, and expense.

Fig. 3 of the drawing shows substantially the same combination of form and impression cylinders as in Figs. 1 and 2, similar letters indicating like parts; but in Fig. 3 said cylinders are arranged so that they may directly gear with one another instead of employing intermediate gearing, as shown in Fig. 1. The action, however, is the same both as regards the one form-cylinder B and two impressioncylinders C G2 printing on the one side of two independent webs, and three form-cylinders and four impression-cylinders doing the same work as four form-cylinders and a correspond ing number of impression-cylinders. Applied to the surfaces of both the form and impression cylinders are bands s, of leather, rubber, wood, or other comparatively yielding material, arranged around said cylinders land in contact with each other, whereby continuous contact is preserved between the form and impressioncylinders throughout theirjentire revolution, thus doing away with dragging77 or slurring, and counteracting the effect of backlash in the gearing by which said cylinders are connected or driven.

I claimlThe combination and arrangement of two pairs of cylinders or rollers, the one pair of which is composed of one form-cylinder, B1, and an impression-cylinder, C1, while the other pair is composed of one form-cylinder, B2, and an impression-cylinder, G3, and an interposedl series vof cylinders consisting of two impression-cylinders, C G2, and one intermediate formcylinder, B, for operation on two independent webs fed in opposite directions from the press, substantially as shown and described.

JOSEPH L. FIRM.

Witnesses BENJAMIN W. HOFFMAN, VERNON H. HARRIS.

Images