US952060A - Rotary printing-press for printing from intaglio half-tone printing-plates. - Google Patents

Description

H. A. W. WOOD.

ROTARY PRINTING PRESS FOR PRINTING PROM INTAGLIO HALF TONE PRINTING PLATES.

APPLIUATION FILED NOV. 15, 1901. RENEWED JULY 8, 1909.

5 06 Patented Mar. 15, 1910.

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HENRY A WISE WOOD, OF YORK, N. Y., ASSIGNOE TO CAMPBELL PRINTING ERESS & MANUFACTURING COMPANY, OF NEW YORK, N. Y., A 00 DEATION GE NEW YORK.

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Application filed November 15, 1901, Serial No. 82,436. Renewed July 8, 1909. Serial No. 506,616.

To all whom it concern:

Be it'known that I HENRY A. Wren Wooo, a citizen [of the Umted States, residing at New York, in the county of New York and State of New York, have invented a new and useful Rotary Printing-Press for Printing from Intaglio Half Tone Printing Plates, of which the following is a specification.

A new form of printing plate has recently come into use, WhlCh consists of a half-tone printing plate, cut or etched in intaglio. So far as 1 have been informed, all printing from a plate or plates of this character has paper. The plate is then brought into 0011-. tact with an lmpression cylinder which carpreviously been done with the plate in a flat condition. This method of printing is slow.

The object of my present invention is to provide a rotary printing press, adapted to print from a plate of the character referred to, at great speed.

To practice my invention, I curve the plate, and fasten it upon a cylindrical platecarrier, and treat it in the following way The plate is inked by rubbing the ink into the intaglio portions thereof by inking rollers, WhlCh are preferably covered with leather, and which are geared to run faster or slower than the plate, and in'the same or an opposite direction to slip thereon, so as to rub the ink into the plate. After the late is inked, a blade, like a fountain-bla e, is

pressed against the same to scrape off all the surplus ink, and leave only the ink in intaglio lines. After this is done, the plate is moved into contact with a polisher, which .removes the last traces of ink from the surface before it comesinto contact withthe ries the paper. B this 'way of printing great speed is obtailied, and a better printmg effect, because the printing surface'will a be curved, and-therefore, the pressure of impression will be much greater. In most instances, I co'ntem late using an additional scraper, set at di erent pressure, and made of a different material. The first scraper is generally-made hard and is adjusted to take off the main body of the ink, while the sec- 031d has, a gutta-percha or indurated fiber e e.

eferrin to the accompanying drawing forming p rt of this application, I have i shown enough of the principalparts of the which preferably skilled in the art to construct a machine em bodying my present idea.

In said drawings, Figure 1 is a sectional elevation of the principal parts of the mech anism, and Fig. 2 is a partial plan view showing the gearing.

Referring to the drawing and in detail, I designates an impression cylinder, which has the usual grippers 9. Sheets are fed to the same from the feed-board F carried around on the said cylinder, and delivered from the same by the fly D on to a suitable delivery board.

B represents the printing plate carrier,

is made of twice the diameter of the impression cylinder.

P designates the intaglio printin plate.

Specification of Letters Patent. Pafiugntedl Mam 1L5, 1193110). I

The printing plate carrier preferab y is cut away for about one-half of its surface, as at B, and has its other surface made long enough to carry and support the printingplate P.

By making the printing plate carrier B twice the size of the impression cylinder I, and by cutting away one-half of its surface, an efficient form of machine is provided. The impression cylinder will make two revolutions relatively to the printing plate carrier, one revolution to print the sheet, and the other revolution to deliver the sheet.

By the cut away arrangement of the printing plate carrier, the impression cylinder and printing plate carrier can be geared directly together, and cooperate properly without the application of any raising and lowering mechanisms to the impression cylinder.

The printing-plate P is bent 1n any suitable manner, and is applied to cylinder B and held thereon by straining devices lO-lO arranged in gaps or depressions formed 1n said printing-plate-carrier B. Each of these straining devices conslsts'of an arm, or a series of arms arranged on a shaft supported in said carrier, each of said arms having jaws to grasp the end of the plate, and suitable screws to adjust said arms to hold the.

printing-plate P tightly on the printing cylinder. j

- 11 designates the form inking rollers. Four are shown in the present instance as a v the arrangement just described is the pre desirable number. These inking rollers are preferably covered with leather. The four inking rollers are arranged in two sets of two each, as shown. (lo-acting with each 1s a distributing roller 12, and co-acting with each distributing roller is an ink carrying roller 13, which carrying rollers bear on an ink-drum 14.

15 designates a ductor roll which is mounted in suitable arms 16, and actuated by any of the usual mechanisms to take ink from the fountain N, and lay the same on the ink-drum 14.

The printing late carrier B carries a gear 17 of a pitch ra ius equal to the pitch ra 111s of the working surface of the printing plate P, which gear meshes with a gear 18 carried by the impression cylinder I. The gear 18 is of a pitch diameter equal to the diameter of the impression cylinder. By this arrangement the peripheral speed of the printing plate will equal the peripheral speed of the impression cylinder, and the impression cylinder I will make two revolutions for each revolution of the printing cylinder. The impression cylinder I will not contact with the printing plate carrier B, except through the printing plate, on account of the cut away portion B of said cylinder. A gear 19 is arranged on said printing plate carrier B just inside the gear 17. This gear is made considerably smaller than the gear 17. Arranged on the form inking rollers 11 are gears 20 which mesh with said gear 19. The gears 20 are considerably larger in diameter than the diameter of said form inking rollers 11, whereby said form inking rollers will have a peripheral speed considerably slower than the peripheral speed of the printing plate, so as to have a wiping action thereon to force the ink into the depressions of the printing plate. This wiping action may be obtained in other ways, as by driving the inking rollers in opposition to the movement of the plate, or 1n any way toobtain a peripheral slip between the plate and the form inking rollers. But

ferred one, as it gives about the proper degree of slip necessary for nice half-tone work. Moreover, I regard this arrangement as far superior to constructions in which the inking rollers are turned at greater speed than the printing plate, because if such a construction should be adopted the tail of the plate or any high place in the plate which is followed by a de ression will receive a surplus amount of in which will be due to the more rapid surface travel of the inking rollers, and this surplus of ink which may be piled up, so to speak, on the tail of the plate or upon the high points of the plate Wlll be wasted as it will be taken off by the scrapers with no chance of being rubbed or worked into the intaglio lines. Arranged on i said inking rollers 11 are gears 21 of a pitch diameter equal to the diameter of said inking rollers, which are geared by gears 22-232 1 on the distributers 12, carriers 18, and ink drum 1 1, respectively, to drive the cluster of inking rolls at the same peripheral speed.

S designates a suitable scraper. The same is preferably made of a steel blade secured to a cross-bar. Bearing on this blade are a number of adjusting screws 25 by which said scraper can be adjusted to bear with any desired degree of pressure on the printing plate. 26 designates a pot or receptacle, arranged in position to catch the ink scraped off of the printing plate by said scraper S.

I generally employ a second scraper having adjusting screws 27 and a pot 28. This second scraper is generally made out of indurated fiber or hard rubber; the first scraper being used to take or? the main body of the ink, and the second to go over the surface again with a more delicate pressure.

29 designates a roll arranged in such position that a blanket preferably made of cheese-cloth or similar material will bear on the plate. This blanket is given a slow movement, and is wound back and forth by suitable rollers 31 and 32, or any suitable mechanism. This blanket will act as a polisher, and will polish the plate, and will remove every trace of ink therefrom, except from the intaglio lines or depressions.

The operation is apparent from the foregoing description.

As the printing plate carrier revolves, the ink will be-forced into the depressions of the plate by the slip of the inking rollers thereon, the surplus ink will be scraped oif, the plate polished, and the sheet printed by contact of the plate with a sheet carried by the impression cylinder.

Great speed can be obtained with this apparatus, and very fine printing effects, due to the nicety of the inking, and a heavy impression obtainable from a curved late.

Many other forms of apparatus may edevised by a skilled mechanlc without departing from the scope of my invention, as ex- 115 pressed in the claims. Havin thus fully described my invention, what I c aim and desire to secure by Letters Patent is 1. In a device for printing from an in- 120 taglio printing plate, the combination of an impression cylinder, a cylindrical platecarrier cooperating therewith, devices for inkingthe plate, and two scrapers for removing the surplus ink, one scra er being 125 made of hard material, and the ot er being made of soft material.

2. In a device for rintin -from an intaglio printing plate, t e com ination of an impression cylinder, a cylindrical plate- 130 carrier cooperating therewith, an inking my hand, in the presence of tWo subscribing apparatus for inking bthe platigltzivo scrzapeis, witnesses. one havin a hard earin a e an t 1e other a soft bearing blade tor reinbving the WISE surplus ink, and a polisher for polishing the Witnesses: plate before impression. I SEYMOUR CONOVER,

In testimony whereof I have hereunto set JAs. H. CRAFT.

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