US1482354A - Art of printing - Google Patents

Description

Jo 9 l C. F. DAUSMANN ART OF PRINTING Filed Jan. 17, 1922 2 Sheets-Sheet 1 CarZeJZhw/rzam Jan. 29, 1924- C. F. DAUSMANN ART OF PRINTING Filed Jan. 17. 1922 Z-Sheets-Sheet 2.

Patented .l. 29, 1924.

CHARLES I, DAUSMANN, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE PRISMA'I'ONE CO. INC., OF NEW ,YOR-K, N. Y., A CORPORATION OF NEW YORK.

ART or ynm'rme.

- Application filed January 17, 1922. Serial No. 529,812'

To allwhomitma concern."

Be it known t at I, CHARLES F. Dans- MANN, a citizen of the United States, and a resident of Brooklyn, in the county of Queens and State of New York, have invented a certain new and useful Improvement in the Art of Printing, of which the following is a specification.

My resent invention is identified with the art 0 printing and particularly comprehends the application to' a web printing press of means for maintaining accurate regf istration of the web with the'printing surmovement through the press.

. be employed for the purpose of destroyingv faces. I

In the operation of printing presses wherein a plurality of spaced printing couples are employed, the proper registration of the paper web with the successive printing cylinders is rendered difficult owing to the presence of a static. electrical charge which is accumulated by the web in its As is well known in the art, neutralizing devices mus't the influence of the static charge which would otherwise cause a lateral deviation of the paper web so that the web would not.

properly register with the printing surface. I have found that the use of such neutr lizers may be dispensed with and that t ev paper web may be caused to properly register with the successive printing couples by utilizing an electrostatic charge so that the web willbe subjected to, the attractive influence thereof and be thereby held against lateral deviation from its course of travel between the spaced printing couples.

It is another important feature of'my present invention to provide simple mechan-' such a multi-color press-that absolutely precise and perfect registration shall be obtained between the paper web and the printing surfaces as the paper moves successively from one couple to another so as to avoid improperly super-imposing one color upon another.

In one mechanical embodiment of the invention I provide. means for inducing an electrostatic chargeconsisting of an endless blanket having one stretch in opposition to the paper web and moving over a stationary plate or bed. The blanket is faced with rubber thereby providing a surface of high frictional resistance to which the paper web is caused to tightly cling by the attractive influence of the static charge which is uniformly distributed over the area of the paper web extending between spaced printing couples. This mechanical electrostatic charge inducing means I have disclosed in a general way in the present application. For a more detail understanding of the mounting and.arrangement of the endless blanket and the operating means therefor, reference may be had to a second pending application filed August 6th, 1919, Serial No. 315,603,

renewed February 7, 1921, Serial No. 443,226. In the present application I propose to describe and claim the method and means for registerlng a web with a printing surface by the utilization of static electricity in its generic application to the art of printing.

It will accordingly be understood that the general aim and purpose of this inventionis to provide means for maintaining accurate registration between the web and the printv ing surface, regardless of the specific type of printing press in connection with which the inventlon may be used.

.With the above and other objects in view" the invention consists in the improved method and means for controlling the movement of the web and effecting its registra tion with the printing surface, as will be hereinafter more fully described, illustrated in the accompanying drawings and subsequently incorporated in the subjoined claims.

In the drawings wherein I have illustrated one desirable and practical embodiment of the invention and in which simila'rreference' characters designate corresponding parts throughout the several views,

the supporting means for the endless blanket,

illustrating one manner of mounting the same.

In the operation of a multi-color printing press of the type disclosed in my prior application above referred to, there is provided a plurality of vertically spaced printing couples. For purposes of illustration I have shown in the present instance, four suchprinting sets or couples, each of which consists of a printing cylinder 5 and an impression cylinder 6, the latter being provided with the usual peripheral facing or sheath of rubber. The paper web moves downwardly between the printing cylinders and impression rollers of the successive couples, each of which prints upon one side of the paper web in one color. It is apparent that in order to avoid improperly imposing one color upon another, the paper web must not shift laterally or deviate to any extent whatever during. its vertical movement between the spaced printing couples, in an axial direction with relation to the printing cylinders. The paper web as it is drawn through the press moves over metal rollers or stationary 1 metal parts so that the resulting friction creates a static electrical charge. The cumulative effect of these small charges of static electricity produces a shifting lateral movement of the web. It [has heretofore been found necessary to take out this static elec-.

influence o the induced charge operates toprevent shifting of the web and thus insures an exact registration between the web and each of the printing surfaces or cylinders. To this end, as shown in Fig. 1 of the drawings, an endless blanket 7 is sultablymount- -ed and arranged in the spaces between the printing sets or couples. This blanket passes around suitably spaced supporting rollers so that one stretch of the blanket extends substantially over the entire distance between I the pass of the printing couple immediately above the blanket and the pass of the next lower printing couple.

' The body of each blanket 7 consists of a relatively heavy sheet of canvas 8 which is struction gives the-best results, it is not to be understood that the present invention is necessarily limited to such a specific form and construction of the blanket.

The blanket supporting rollers 10 are mounted in a suitable frame, which frame is adjustably mounted in the frame of the press in the manner disclosed in my application Serial No. 443,226 above referred to. It will be understood that the specific frame construction and the adjusting means therefor, constitutes no part of the present invention. It will suffice to state that the frame is provided with a metal plate 11 preferably slightly convexed and extending vertically between the spaced printing couples. Over the convex surface of this plate the canvas body 8 of the endless blanket moves. Any preferred means may be employed for operating the blanket and it is moved over the metal plate 11 at the same surface speed as the paper web moves. between the printing couples of the press.

The frictional contact of the canvas body 8 of the blanket with the plate 11 induces an electrostatic charge of the opposite polarity from the charge carried by the paper web immediately above the blanket. The induced electrostatic charge acting through the rubber surface 9 of the blanket, by its attractive influence for the charge on the opposed surface of the paper web tends to draw the paper web down tightly on the rubber surface of the blanket. The induced electrostatic charge is uniformly distributed throughout the area of the blanket which is opposed to the'web and since said blanket is of a width as great as or exceeding the widthof the web, every part of the paper web is held with the same tenacity against the rubber face of the blanket. In addition to the tractive holding influence of the electrostatic charge, the rubber facing of the blanket offers a very high frictional resistance to any tendency of the web to shift laterally during its movement between the spaced printing couples. Such uniformly distributed frictional resistance results in a uniformly tight contact between the rubber surface and the web throughout the area of the latter. Of course, the closer and better contact which is obtained between the web and the rubber surface. the more effective will be the attractive influence of the electrostatic charge to hold the paper web 5 tion and themanner of its operation will be far as the present invention is concerned, it is not essential that an endless blanket be f blanket does not exert a longitudinal pull upon the web which would tend to tear the same. In this manner it will be appreciated the cylinder is obtained so that the different colors printed by the respective sets or couples will be exactly and precisely placed upon the web and the colors will not. be improperly superimposed on each other.

From the foregoing description considered inconnection with the accompanying drawings, the nature of my present inven{ thoroughly understood. I have shown in the accompanying drawings four of the printing sets or'couples th'ough itwill be manifest that any desired number of said printing couples'might be employed. In so employed as other means for producing the electrostatic charge might be devised which would operate as well to hold the paper web against lateral deviation from its line of movement' from the press. Accordingly,

ber art as a sandy rubber for my blankets.

I claim:

1..In the art of printing, maintaining registration of a web witha printin surface by subjecting the web to the in uence of static electricity, and confining the. effective action of such static electrical influenee" to lines at right angles to the line of feeding movement of the 'web whereby the web is held against lateral deviation from the line 1 of feed.

. held against lateral deviation from the line -2. In the art of printing,"maintaining registration of a web with a printing surface by subjecting the'web at one side thereof toithe influence -of' an induced electrostatic charge, and confining the effectiveaction of such'static electrical influence to lines at right angles to the line of feeding movement of the web whereby the web is of feed.

3. In the art of printing, maintaining registration of a web with a printing'surface by subjectingthe surface area of the' web at one side thereof to the influence ,of

. a uniformly distributed-electrostatic charge,

and confining the effective action of such static electrical influence to lines at right angles to the line of ,feedin movement of the web whereby the web is held against lateral deviation from the'line of feed.

4. In the art of' printing, producing an induced electrostatic charge between spaced printing couples of the press atone side of the web and'slibstantially throughout the area of the web extending between the spaced printing couples and subjecting the web to the attractive influence of the electrostatic charge to maintain registration of the web with the printing surface, and confining the effective action of such static electrical influence to lines at right angles to the line of feeding movement of the web whereby the web is held against lateral deviation from the line of feed.

5. In the art of printing, opposing a urface of high frictional resistance to one side of the paper web and moving said surface at the same speedas the web, and creating aninduced electrostatic charge on said surface, theattractive influence of the electrostatic charge holding the paper web in close contact with the friction surface.

6. In the art of printing, moving a surface of high frictional resistance" opposed to one sideof a paper web at the same speed as the speed of movement of the web through a press and subjecting the web to the influenc'e of an induced electrostatic charge to cause the web to closely cling to the friction surface.

7 In the operation. of a multi-color printing press, subjecting the web between spaced printing couples of the press to the influ- .ence of induced electroetatic' charges to thereby hold the web against lateral deviation in its movement from one printing couple to another. N

8. Means for registering a web with a printing surface, comprising a fixedpart at one side of the web, a canvas sheetmovable upon said fixed part at the same-speed as the movement of the web and frictionally coacting with said fixed part'to create an induced electrostatic charge, said canvas sheet being of greater width than the web, and a surface of high frictional resistance on said canvas sheet opposed to the web through which the-electrostatic charge exerts ;an attractive influence upon the web to draw said web into close contact with said-frictional surface for movement as a unit therewith. i

9. Means for registering a web with a printing surface comprising an endless blanket having a canvas body, said blanket being movable at the same. speed as the movement of the web, a relatively fixed part with which aid-canvas body frictionally coacts to create an induced electrostatic charge, and a rubber surface on said convas body in opposed relation to the web through which the electrostatic charge exerts an attractive influence on the web to hold the latter in close contact with the rubber surface of the blanket for movement as a unit therewith.

10. In the art of printing, opposing a contacting, surface to one side of the paper web as it is fed to the printing cylinder, and effecting registration of the web with the printing surface by subjecting the web to 10 the influence of an induced electrostatic charge exerting its forces in lines at substantially right angles to the line of feeding movement of the web to thereby prevent lateral deviation of the web relative to the said contacting surface.

In testimony that I claim the foregoing as my invention, and I have signed my name hereunder.

CHARLES F. DAUSMANN.

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