US633898A - Mechanism for preventing offset in printing machines. - Google Patents

Description

Na. 633,898. Patented Sept. 26, I899.

0'. E. PATTBERG.

IECHANISN FOR PREVENTING OFFSET IN PRINTING MACHINES.

(Application filed Inn. 29, 1897.)

(No Indal.)

v f 3 E l\ we Q N v Witnesses. Inventon v c. Elgffttberg. -JZB KMA v WY W Atto rn 63 5 I UNITED. STATES PATENT @Trriosr CHARLES E. PAT'l-BERG,OF YORK, N, Y.

MECHANISM FOR PREVENTING OFFSET IN PRlNTlNG-MACHlNES.

SPECIFICATION forming part of Letters Patent No. 633,898, dated September 26, 1899. Application filed January 29,1s97. Serial No. 621,147. on model) To all whom it may concern:

Be it known that'I, CHARLES E. PATTBERG, a citizen ofthe United States, residing at New York, in the county of New York and State of New York, have invented a new and useful Improvementin Attachments for Web-Printing Machines, of which the following is a specification. I

The aim of this invention is to provide any of the forms of web-printing machines with an attachment or means whereby ofiset will be prevented and whereby the perfected web will be prevented from blurring as the same is drawn or led over the various rollers and mechanisms beyond the printing mechanism.

In my Patent No. 613,045,.dated October 25, 1898, I have shown and claimed a device wherein an ink drying medium, such as finely-powered talc or French chalk, may be deposited on the first printed side of the Web in a web-printing machine before the web is led to the second impression-cylinder or printing mechanism, so as to prevent ofi'set from the said second impression-cylinder.

In the present application I further carry out this invention by providing means whereby this offset-preven ting mediumwill be applied to the second printed surface of the web and also preferably again to the first printed side of the web, so that the Web passing over the subsequent rollers'and folding mechanism will not have either side blurred.

I have found that by using a mixture of the character referred to not only will all the ink be kept on the web, but a highly-lustrous efiect will be given thereto.

The ordinary ofiset-preventingdevice acts somewhat on the principle of a piece of blotting-paper, absorbing the surplus ink, thus rendering the letters orimpression cloudy,

which of course is undesirable.

My invention works upon the opposite principle-that is, of keeping all the ink possible upon the work and setting or drying the ink by the drying medium which is applied thereto.

I will furtherdescribe my invention as applied to an ordinary form of rotary webprinting machine.

In the accompanying drawing I have shownin section how my invention may be applied thereto.

Referring to said drawing and in detail,-

A designates .the first printing-cylinder, B

the first impression-cylinder, O the second impression-cylinder, and D the second print-. ing-cylinder, of a web-printing press. The cylinders A and B print on one side of the web and form the parts I term the first printing mechanism, and the cylinders O and D print on the other side of the Web and form the parts I term the second printing mechanism.

Ooacting with the impression-cylinder A is a suitable inking device E, and coacting with the printing-cylinder D is a suitable inking device E.

The web to is drawn from a web-roll WV, being pulled therefrom by means of a drawing-in device,which consists ofa contin uouslyrotating drum 10 and a set of tapes 13, which run around tape-pulleys 11, 12, and 14. From the drawing-in device the web passes between the cylinders A and B, then to the cylinder 0, between the latter and the cylinder D, then around guiding-rollers 15 and 16, and between the rollers 17 and 18 to any suitable folding device, which is designated as F.

H represents a suitable hopper, in which are mounted a number of rollers, as 20 and 21, the last roller of which bears on the first impression-cylinder B. Powdered talc or chalk is placed in this hopper and is carried by the action of the rollers up to and deposited upon the first printed side of the web while the same lies upon the first impressioncylinder B.

22 represents a suitable casing in which is mounted a rotary brush 23, the purpose of which is to remove the surplus talc or chalk from the Web before the same passes to. the second impressiomcylinder (J.

28 designates another hopper, in which is mounted a roller 29 and in which the roller 15 is housed, and the roller 15 also serves to deposit talc immediately upon the side of the .web which is last printed.

in suitable casings 31 and 33, so as to remove the surplus talc from the web as the same issues from between the rollers 15 and 27. Suitable knives or blades, as 19, maybe arranged in the said hoppers to cooperate with the rol1- ers 20, 26, and 29, and these blades maybe provided with adjusting-screws 190, so that the amount of talc carried in can be regulated. The various rollers may be covered with any suitable medium which will convey talc such, for example, as felt or soft rubber. By this construction it will be seen that the ink deposited upon the web by the plates on the cylinder A will have an immediate applica tion of talc from the roller 21, so that set-off on the second impression-cylinder C will be substantially prevented. Also it will be seen that the second printed side of the web after the same emerges from between the cylinders O and D will immediately have talc or chalk deposited thereon before the same touches any roller or guide, so that the second printed side of the Web will be immediately dried and prevented from being blurred or defaced in any manner as the web is drawn around the subsequent rollers and passed through the folding device.

I do not always use the hopper 24: and its rollers, but the same is desirable in many instances to insure the first printed side being perfectly dry before the Web passes to the subsequent rollers and folding device. By this construction the printed product will be of a very high character.

The various rollers and parts herein shown are supposed to be driven by any of the usual forms of gearing which will be applied by the ordinary printing-press mechanic and need not be herein shown or detailed to give a clear understanding of my invention. The details and particular arrangements may also be varied as desired to suit the particular machine to which my invention is applied.

I-Iaying thus fully described my invention, what I claim and desire to secure by Letters Patent, is

1. The combination with the first printingcyliuder and the first impression-cylinder and the second printing and impression cylinders of a tank and rollers arranged beneath the first impression-cylinder to apply an ink-dry ing substance to the Web as it passes under the first impression-cylinder, a second set of rollers beneath the second impression-cylin der through which the Web passes to the folding mechanism to be supplied with an inkdrying material after it receives the second impression, and adjustable blades acting on the lowermost of each set of rollers to regulate the amount of material carried thereby to the uppermost rollers all substantially as shown and described.

2. In a printing-machine, the combination of two impression-cylinders one upon each side of the web to be printed and means located on the same side of the Web or sheet as the second impression-cylinderfor applying an offset-preventing medium to the first printed surface of the sheet or Web before the same reaches the second impression-cylinder and means located on the other side of the web or sheet for applying an offset-preventing, medium to the second printed surface of the said sheet, substantially as and for the purpose specified.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CHAS. E. PATTBERG.

Witnesses:

A. A. W. W001), i W. W. Games.

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