US2479521A - Platen for printing machines and the like - Google Patents

Description

1949. M. (3. STEWART 2,479,521

PLATEN FOR PRINTING MACHINES AND THE LIKE Filed Sept. 25, 1944 gsmm 27 28 j k 39 fia a 0 Jul/21 INVENTOR.

1 %mao Patented A... is, 1949 2,479,521

UNITED STATES PATENT OFFICE PLATEN FOB PRINTING MACHINES AND THE LIKE Merritt G. Stewart, Chicago, lll., assignor to Victor Adding Machine 00., Chlcagmlll a corporation of Illinois I Application September 25, 1944, Serial No. 555,714

1 Claim. (Cl. 101-28) 2 Myinvention relates broadly to platens used in mg drawing, and while I shall proceed to deprinting machines, such as checkwriters, and scribe the same in detail it will be understood more specifically relates to platens used in conthat the invention, in its broader aspect, is not I nection with printing machines having type with limited to the structural details shown further scarifyin ty faces, 5 than is required by the terms of the appended Heretofore, it has been customary in printing claim. 7 machines, such as checkwrit'ers, to employ type Still further objects and advantages, in addifaces having projections relatively spaced to regtion to those already poin ed Ou will be @9- ister with complementary grooves or depressions parent as the descrip n pr eeds in connecin a metal platen, for marking checks, bonds or tion with the accomp y drawing in which! other commercial papers with an inked impresg- 1 18 a Perspective w 0! e form 0 a e slon of th value thereof,- or th in l la, so as and hair retainer which may be employed in the to scarlfy or disrupt the fibers of the paper over manufacture of my impr plate!!- the area to which the ink is applied, whereupon Fig. 2 is a face view of the assembled platen the paper will become impregnated with the ink 5' which forms the subjec ma f the P n and thus indelibly marked with the desired ininvention.

scription. Fig. 3 is an end elevation of Fig. 2.

While this type of platen is satisfactory in many Fig. 4 is a vertical cross-section of the platen respects it has several disadvantages. For extaken on a plane corresponding to the line 4-4 ample, such a platen is costly to manufacture, and of Fig. 2. unlws accurate alignment is maintained between Fig. 5 is a fragmentary side elevational view ilthe platen and the scarifying type faces of the lustrating the preferred method of finishing the type, damage to the platen and/or type will occur. platen type-striking surface.

Another form of platen which has been exten- Fig. 6 is a face view similar to Fig. 2 but showsively used in the past for checkwriting machines 5 ing a. modified platen frame where two spaced employing type with scarifying type faces are apart parallel type-striking surfaces are desired. platens having rubber, or a like resilient surface, Fig, 7 i an end elevation of Fig which is pierced by the type face projections. 1; 3 1 a highly magnified fragm ntar View While platens of this type are ch ap o menuclearly illustrating the manner in which the scari- 'ae 'e a the metal p they e a relafying type faces pierce the inking ribbon and tive y short l due to t c t inuous paper and spread the tightly packed hairs of the piercing of its surface by the scarifying type faces platen surface, and,

has a tendency to cause such surface to become Figs. 9 and 10 are front and side views respecworn and pitted. end t e qua y of the Printing tively of a. portion of one form of scarifying type becomes greatly impaired. which may be used in connection with my im- It is the broad purpose of my invention to obproved platen.

viate the foregoin objections found in pre ent In the embodiment of my invention as shown in day platens, for printing machines, by provid- Fig. 2, my improved platen is designated, in its ing a platen which is simple in construction, effientirety, by the reference character A and comcient in operation, economical to manufacture, prises a body portion B rigidly supported withsubstantially indestructible, and one which will in a. frame 0.

greatly improvethe quality of printing. 1 One convenient form in which the frame may The invention had its conception in connection be made is shown in Fig. 1 as comprising two with a checkwriting machine employing type havelongated U-shaped metal parts II and i2, each ing scarifying type faces; but, as will be evident of which have their free ends reduced in width from the present disclosure, it is not limitedtothis to form ears I 3. Part Ii has an end plate ll particular kind of printing machine. 1 rigidly secured thereto, as by spot welding shown More limitedly, it is an object of my invention at l5, and this plate is provided with slots I to provide a platen for printing machines, the dimensioned to receive the ears l3 of part l2. type striking portion of which, is composed of One branch of part II has a wall I! formed intightly packed hairs which may be readily fabritegrally therewith, and bent at a right angle cated into a compact and sturdy sturcture posthereto, which wall serves as a seat or support sessing the features hereinbefore pointed out. for the body 13 in a manner presently described.

My invention, embodied in a platen for print- Part I! also has an end plate ll secured thereing machines, is illustrated in the accompanyso to, preferably by spot welding shown at It, and

slots 20 in said plate and end wall are dimensioned to receive the ears I! of part lil when the frame C is assembled.

Referring now to body B, I propose the use of tightly packed hairs, designated 2|, which are clearly shown in Figs. 5 and 8. The hairs 2| are preferably of a length greater than the width of parts II and i2, as shown at the left hand side of Fig. 5, and while being held in packed relation, are inserted within the parts II and I2 of frame C and against the seat l1. While the hairs are being held in this manner, parts II and I2 are moved towards each other until the ears l3 of part l2 pass into' the slots I6 in plate II, and the ears I! of part II pass into the slots 20 of part l2 and plate l8, at which time the ears are bent over as shown in Figs. 2 and 8. Thus the frame C tightly embraces the body B of hairs 2| with.one end of each individual hair 2| resting upon the seat I! and its other end protruding above the upper edges 22 of parts H and I2 as best shown in Fig. 5.'

The next step involved in the formation of the platen shown in Fig. 2 is to trim the exposed ends of hairs 2| closely to the upper edges 22 of. frame C in any suitable manner, as for example by a cutting element such as the knife 23. I have found that after this trimming operation of the hairs 2 a good type-striking surface is obtained, but if a harder surface is desired, the ends of hairs 2| may be ground substantially flush with said upper edges 22 of frame C by an abrasive wheel shown at 24.

With the foregoing in mind attention is now directed to the highly magnified view shown in Fig. 8, and to Figs. 9 and 10 which illustrate a fragmentary portion of conventional type 25 ing from the more fundamental principles of the having scarifying type faces 26. These type faces usually include pyramidal or needle-like projections 27, which during a printing operation, pierce the inking ribbon, shown at 28, and

the check or paper 29 being printed upon, and backed up by the body portion B of the platen A.

It will be clear from Fig. 8, that when the pointed projections 21 pass through the ribbons 28 and paper 29 to engage the platen surface, the exposed ends of hairs 2| will be slightly parted, as shown, and when such projections are removed, from the platen body B, the hairs .21 will snap back to their normal position. It follows therefore, that as the projections 21 of type 25 pierce the platen, its surface will not be exceedingly worn or pitted due to the yielding action of hairs 2|, in the manner just described.

The modified platen shown in Fig. 6 is formed in substantially the same manner as that described in connection with Fig. 2, and therefore a detailed description is deemed unnecessary. Suffice it to say that in this form the platen has a double surface designated D and E for purposes well known to those skilled in the art of checkwriting and like printing machines.

While I have shown and described a particular embodiment of my invention it will be apparent to those skilled in the art that numerous modifications and variations may be made in the form and construction thereof, without departinvention. I therefore desire, by the following claim, to include within the scope of my invention all such similar and modified forms of the apparatus disclosed, by which substantially the results of the invention may be obtained by substantially the same or equivalent means.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

In combination in a printing machine, type having scarifylng faces, and a platen for backing up printing-receiving material and providing a suitable type-striking surface for the scarifying faces of typ comprising a plurality of hairs disposed in parallel relationship with the ends thereof in a plane to form said type-striking surface, and a frame surrounding saidhairs and holding them in tightly packed condition, an edge of said frame being disposed substantially in the plane of said type-striking surface to insure the surface forming ends of said hairs being maintained in the desired tightly packed condition by preventing spreading of said hairs beyond the confines of said frame.

MERRITT G. STEWART.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 30,353 Ruegg Oct. 9, 1860 137,721 Reese Apr. 8, 1873 157,104 Pickering Nov. 24, 1874 226,962 Berger Apr. 27, 1880 v385,217 Thompson June 26, 1888 407,608 Partridge July 23, 1889 441,057 Coggeshall Nov. 18, 1890 522,567 Winkel July 3, 1894 536,295 Raby Mar. 26, 1895 634,138 Harper Oct. 3, 1899 845,495 Whitehead Feb. 26, 1907 1,174,642 Welter Mar. 7, 1916 1,363,897 Morgans Dec. 28, 1920 1,412,653 Boyett Apr. 11, 1922 1,527,853 Ferdon Feb. 24, 1925 1,815,076 Severy July 21, 1931 1,987,987 Bohmbach Jan. 15, 1935 2,284,528 Malmquist May 26, 1942 Maeser Aug. 3, 1943

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