US1231142A - Packing for printing-presses. - Google Patents

Description

F. E. ELLIS.

PACKING FOR PRINTING PRESSES.

APPLICATION FILED MAR. 22. l9l7- Patented June 26, 1917.

In van tor. .l'Tfl/zlc IL'. 561A? FBANK 'E. ELLIS, 0F REVERE, MASSACHUSETTS.

PACKING FOR PRINTING-PRESSES. 4

Specification of Letters Patent.

Patented June 26, 1917.

Application filed March 22, 1917. Serial No. 156,584.

To all whom it may concern:

Be it known that I, FRANK E. ELLIS, a citizen of the United States, residing at Revere, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Packing for Printing- Presses, of which the following is a specification.

The present invention relates to means for packing the impression beds of printing presses and is particularly designed for news paper and other presses of the type in which the impression member is a rotary cylinder.

It is and long has been the usual practice to make such cylinders of metal, ordinarily cast metal, and to provide such cylinders ,rwith coverings, known as blankets, which are somewhat yielding so as to permit the paper, which is pressed against the same when receiving the printing impression, to yield and accommodate itself to the irregularities in the printing plates, while being also firm enough to hold the 'paper up against the types of the printing plates and prevent the paper from being broken or deeply indented thereby. The blankets heretofore generally employed are the so-called' rubber blanket and felt blanket, the rubber blanket being placed directly against the cylinder and the felt blanket being laid over the rubber blanket. These blankets give the necessary qualities of resilience and firmness required in the impression member of a rota press, the rubber blanket being elastic an d resilient, while the felt blanket has the required balance between firmness and softness which is required of that part of the packing which comes directly into contact with the paper. 7

My present invention is concerned with an improvement in the packing means for such cylinders which combines all of the advantages of the packing previously used, with other improvements and advantages which I will point out in the following specification.

In the drawings forming a part of this specification,--

Figure 1 is a cross sectional vieii of an impression cylinder having my improved packing applied thereto. Fig. 2 is a fragmentary sectional view on an enlarged scale of the packing.

back To such surface,

The same reference characters indicate the same parts in all of the figures.

In the drawings,a represents a rubber blanket so-called and 6 represents felt blanket so-called. Such rubber-blankets are composed of several layers of frictioned textile fabric, ordinarily cotton laid together and vulcanized, with a layer or film of rubber composition having appreciable thickness on one face thereof. The opposite face of such packing usually has little or no exposed rubber, or atmost only so much as is carried by the surface of ordlnary frictioned fabric. In Fig. 2 the textile fabric layers of the blankets are indicated diagrammatically by the undulating lines a and the dots (Z. So much of the rubber blanket as is above thereof. Another part of the blanket consists'of a face layer or ply e which is preferably of Woven fabric, ordinarily cotton, and carries a surface coating or film f. Such coating or film is preferably nitro cellulose which is combined with an emollient such as a non-drying oil, preferably castor oil, in order to keep the layer pliable and prevent it from becoming hard and brittle. Said face layer is united or doubled to the back of the body a by a film g of adhesive material, preferably a flexible oil-proof and water-proof cement. In this description the of the rubber blanket is that face which does not carry a film of rubber but is of textile fabric with little or no exposed rubber. the fabric face ply e may be united or doubled sufficiently firmly for the purposes of a printers blanket by means of any cement ofthe sort indicated.

The so-called felt blanket consists of a body, which is the part designated by the letter 6, and is composed of one or more plies woven from woolen yarns by well known methods of weaving so as to form a compact body, the fibers of which are drawn out on one surface to form a long nap which is matted down into smooth surface similar to that of felt. In the printing art, this particular fabric is called felt in spite of the fact that it is actually a woven fabric.

On the felted face of the body I) is secured or doubled by means of an adhesive layer or film [1,,3. face layer 7: having an exterior coatlng Z. The face layer is, its coating 1 and the described constitutes the body or base V blanket.

outside of the rubber adhesive It may be and preferably are identical in construction and material with the face ply e, coating f and adhesive film 9' already described.

The coating Z is smooth, whereby it is fit to come in contact with the paper and support it against the pressure of the printing plates. It is non-porous and impervious, wherefore it does not absorb ink and will not permit the oil contained in the printers ink topenetrate into the body of the felt It further repellent to printers ink; that is ink not adhere readily herent thereto than it is to paper. Wherefore ink deposited on a sheet of paperupon one impression, and being brought immediately thereafter into contact with the blanket of a second impression cylinder when receiving an impression on its other side will not deposit ink on the face of the blanket. Thus offsetting, that is transferal of ink from one paper or sheet by means of the blanket to a subsequent sheet passing through the press, is prevented. 1

The packing above described is. secured to the cylinder in any desired way, the usual manner being preferred and that being the means herein illustrated. First the rubber blanket is applied to the cylinder with the face m opposite to the coated fabric ply against the surface of the cylinder. One edge of this blanket is bent into a groove extending longitudinally in the face of the cylinder and is put over pointed pins a which are set into one of the walls of said groove and project therefrom. The other end of the blanket is carried around the cylinder and across the opposite edge of this roove, terminating just inside of such edge. then similarly applied blanket, with its face layer or ply out, being engaged at one edge with the pins n and its opposite edge being connected to a flap or band 0 fastened to a roll 9, which is mounted rotatably in'the groove with its axis parallel to the axis of the cylinder. This roll is turned so as to draw the blankets tight and is secured in the ordinary way. As my invention does not involve any new method of securing a blanket upon a cylinder, but involves only The felt blanket is the old and commonly used means for this purpose, I have not deemed it necessary to illustrate such means in complete detail.

- It will be appreciated that the packingherein described, as it embodies a rubber blanket on and a felt blanket I) having the characteristics of the so-called rubber and felt'blankets' heretofore used, possesses .all of the useful features'of the blankets heretofore used. It also possesses new and valuable advantages by reason of the face. layers e and k with their coatings and with the films of adhesive which unite them to the rubber and has the quality of being I does to it and is much less ad-' ket. In the case of the rubber blanket, such action consists in dissolving and destroying the rubber, making it soft and spongy and causing it to lose its resilience. In the case of the felt blanket, it soaks through and spoils the same, making it soggy and dea and thus shortening its ultimate period of usefulness. The oil-proof adhesive which attaches these face plies to the blanket bodies also has the effect of excluding oil in case the impervious surface coating should be cracked or broken 0E. The felt blanket body is thus protected by-two layers of oil-proof material, and the rubber blanket body by four layers of such material.

, Either blanket, by reason of its smooth nonofisetting surface, 18 adapted to be placed on the outside and to be run in contact with the paper on the impression cylinder of the second impression. In case the face ply of either blanket becomes injured by the cracking or breakage of its surface coating or otherwise so as to be no longer useful, such layer may be readily stripped from the body or base layer and another similar layer laid over it and secured to the cylinder in the manner described. Since .the face layer 6 is united to the fabric face of the rubber blanket by an adhesive, that is, otherwise than by vulcanization, it may be readily removed and another facelayer substituted; a result which is not possible in case of a layer which is united to a rubber vulcanization.

What I claim and desire to secure by Letters Patent is:

1. The combination with the impression member of a printing press, of a rubber blanket having a face layer doubled thereto secured to the cylinder next to the surface thereof, and a felt blanket secured to the cylinder so said rubber blanket, said felt blanket having a face layer vdoubled thereto and provided on its outer side with a non-ofisetting coating.

2'. A packing for the impression member of a printing press, comprising a rubber blanket and a felt blanket, each kets having a face layer of fabric secured to the body portion of said blankets by an adhesive which is oil-proof and water-proof, and said face layers each having an outer coating of material which is repellent to ink and is non-absorbentand smooth. 3. Apacking for of a printing press, comprising arubber blanket body including textile fabric disp'osed on .onesurface thereof and a face article of as-to overlie the face layer of of said blanthe impression member layer of fabric doubled with oil-proof adsaid blankets being arranged outside of the hesive to the fabric side of Said ru ber blanother blanket with its ink-repellent coating ket body and having an outer coating of outward.

nitro cellulose, and a felt blanket body hav- 5. A printers blanket, comprising a rub- 5 ing a face layer doubled thereto, said face her and fabric body having a fabric sheet layer being provided-With an outer coating disposed on one face thereo and being vulof nitro cellulose. canized, a fabric face layer vunited by an 4. A packing for the impression cylinder adhesive to the fabric side of said rubber of a printing press, comprising a rubber blanket, and a coating of nitro cellulose on 10 blanket body and a felt blanket body, each the outer side of said face layer and hav of said blanket bodies having a face layer ing 'a smooth impervious surface which is united thereto by an adhesive, and each of repellent to printers ink.

said face layers having a coating of ma- In testimony whereof I have afixed my terial Which is impervious to oil and is re-' signature.

is pellent to printers ink and smooth, one of I FRANK E. ELLIS.

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