US1428795A - Printing device - Google Patents

Description

C. P. MEZGER.

PRINTING DEVICE.

` APPLICATION FILED- Nov. I1, 1921. 1,428,795.,

@Patented Sept. 12, 1922.

'2 SHEETS-SHEET I.

cH/I//EZGER C. P. MEZGER.

PRINTING DEVICE.

APPLxcATl'oN man Nov. 17. 192|.

1,428,795.' PatentedSept. 12, 1922.

2 SHEETS-SHEET 2- ,Z 5 I j C. PMZR,

/ A Zarref.

Patented Sept. 12, 1922.,

ansias CHARLES P. MEZGER, OF GLENBURNE, TIIARYLAND.

` PRINTING nnvron.

Application filed November 17, 1921.

To all whom t 'may concern 1 Be it known that I, CHARLES l?. Mnzonr., `a citizenof the United States, residing at Glenburnie, in the county of Anne Arundel and State of Maryland, have invented certain new and useful Improvements in Printing Devices, of which the following is a specification.

This invention relates to printing devices, and more specifically to an improved device for 'producing lithographie impressions on bank-checks and the like, by a process known as dry lithographing.

The main object of the invention is to provide an improved printing device for producing, with an offset printing press and safety ink, a more perfectly outlined or precisely defined impression than that which is produced by devices or methods known or used prior to my invention.

A further object is to provide a device of this character which reproduces, or trans .fers from the relief design to the paper or impression receiving object, an impression which is exactly the size and shape as that of said design and eliminates ink-stains beyond the said impression.

Other objects and advantages will be pointed out or implied in the following description, in connection with the accompanying drawings in which:

Fig. l is a perspective view illustrating my invention in connection with a. sheet of paper being printed thereby.

Fig. 2 is a front elevation of my improved printing device.

Referring'. to these drawings in detail, in which similar reference characters correspond with similar parts throughout the several views; the invention consists in the construction and arrangement of parts which will now be fully described as follows:

A platecylinder is indicated Lt l, and at 2 is indicated a plate having images or designs in relief 3 thereon. A. blanket-cylinder is indicated at 4, and a blanket 5 is secured thereon and includes raised portions 6. The blanket 5 is of the ordinary or any appropriate construction, except that it includes the raised portions 6 whose upper or outer faces are rubber or the equivalent, these raised portions having abrupt edges, that is, these edges are substantially perpendicular to the printing face and meet Serial No. 515,847.

the latter at an angle rather than being curved or convened.

rlhe pressure-cylinder 7 is disposed under the cylinders l and et, in such close proximity 'that a sheet of paper, (indicated at P), when passed between the cylinders t and 7, receives an impression from the raised portions 6. lt should be understood that the images or designs 3 are inked by any appropriate means, and that when they come in Contact with the raised portions 6, they transfer the impression from the images 3 to these raised portions 6 in the reversed position, and therefore, when the impressions are transferred from the portions G to the paper, they are received by t-he paper in the correct or original position. lt should also be understood that any appropriatc means (not shown) may be employed for gearing the cylinders to one another in such manner that they images 3 will always register correctly with the raised portions 6.

It is recognized that the foregoing description does not distinguish from what has been previously known or used, except that the impression-transferring rubber portions 6 are raised labove the surrounding surface of the blanket, being thicker than these surrounding portions, and having abrupt edges which form substantially sharp corners at their respective junctions with the faces of these impression-transferring faces or portions. However, 'this is avitally important distinction over what has been previously employed in the art of printing in relief or on the offset press. Another important distinction over the ordinary lithographie plate is that the images or designs 3 are somewhat above the general or intervening surface of the plate 2.

rlthose who are familiar with such printing will understand that dark places, on the stub and margin of a check, result from the spreading of the comparatively thin safety ink; that is, the surplus inkI from the printing surfaces being forced by the pressure of the printing cylinders onto the surface beyond that. which is intended to receive ink; this spreading of the ink being in consequence of the fact that the printing surface of the blanket is iiush or even with the surface which surrounds the part intended to receive the ink from the cylinder l.

in order to avoid this clouding or discoloring of the stub and margin of the checks or the like which are printed with safety ink, it has become customary to provide a screen or over all tint on the stub and margin of the check. However, this does not meet the demand for a check having a face printed with safety ink. The

y present demand is for a check having a face 'printed with safety ink, and having a perwith or exerting a pressure on either the cylinder l or the paper,-and therefore, the

`ink' will not spread beyond the edges of the respective raised portions which transfer the impression from the image to the paper.

It is not intended to limit this invention to the exact construction and arrangement of parts as shown and described, but changes may be made Within the scope of the inventive idea as implied and claimed.

Vhat I claim as my invention, is:

The combination With an oii'set printing press including a blanket-cylinder and a plate, the latter having thereon a design in relief, of a blanket 0n said blanket-cylinder, said blanket including a relatively thick impression-transferring portion which has' substantially sharp edges defining its outline, this outline being the same sizeand shape as that of the vsaid design, for the purpose of reproducing an impression vWhich is exactly the size and shape as that ofsaid design and eliminating inkstainsrbeyond the said impression.

ture.

CHARLES P. Mnzenn.

Images