US1650404A - Royaltype plate - Google Patents

Description

Nov. 22, 1927. A

J. J. WALSH ROYALTYPE PLATE Original Filed Nov. 7. .1924

.n 3 a. Q M m I,

Patented Nov. 22, 1927.

} UNITED STATES PATENT OFFICE.

JOHN J'. WALSH; OF MAPLE SHADE, NEW JERSEY, ASSIGNOR T ROYAL ELECTROTYP] COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYL- VAN 11A.

ROYALTYPE PLATE.

Original applications filed, November 7, 1924, Serial Divided and this application filed My invention relates to electrotypes which mag; be either positive or negative.

general practice lead molded electrotypes require for their production a copper original engraving which is almost universally of .063 thickness.

The main purpose of my invention is to provide hard-metal-backed "duplicate originals in the form of master electrotypes from which electrotypes may be made in quantity and to the best advantage.

A further purpose is to duplicate engravings and photo engravings, cuts of any kind and also type metal, separately or together in such form as to be equally as effective as original engravings and even harder than original en avings, well suiting them for the productlon of electrotypes.

A further purpose is to provide an elec- 29 tro c with a cohesively united backing of hard metal to bring it to normal thickness of plates to be reproduced.

A further purpose is to backan electrotype surface by hard material cohesively united to the 'electrotype and in rigid and uninterrupted engagement therewith andto utilize the hard plates so produced for the production of electrotypes, making the thickness of the plate equal to the thickness of the backed electrotypes so that, when it does not include the entlre printing surface, it may be used along with other cuts to complete the printing surface.

Further purposes will appear inthe specification and in the claims.

I have preferred to illustrate my invention by one main form onl selecting a form which is practical, e cient, reliable and eminently satisfactory, and which at the 49 same time well illustrate the principles of my invention.

Figure 1 is a front face view of an electrotyped (plate, which may be either printing plate or master electrotype.

Figure 2 is a section corresponding to line 22 of Figure 1 showing a master plate.

In the drawings similar numerals mdicate like parts.

Reproduction of electrotypes from other quired. The initial plate has usually can be backed with hard materiaL'co at. 748,413, and April 14, 1927, Serial 110. 183,788. July 9, 1927. Serial 1 w. 204,581.

electrotypes where lead moulding (for color Work, for example) is required has beenof making successive electrotypes which are.

exact duplicates. Electrotypes from electrotypes have therefore been limited to such as electrotyped type matter, and composite matter in which the distortion will not-be noticed and in which no registration is rebeen made by wax process or had contained a wax process plate.

I have discovered that an electrotype plate eslvely united to it and finished to uniform thickness without injury to the face of the plate,

milling it, Serial No. 183,738, filed April 14, 1927, of which applications the present application is a division.

These applications show suction clutch holding methods, and cutter and tool finishing methods for holding and surfacing the backs of the plates to secure uniformity of thickness and the exact thickness required. At the same time they protect the face of the electrotype.

Though the best results are obtained by lead molded electrotype work, as in the case of all electrotyping Where the lead sheet can be used, my invention is applicable to electrotypes which have been made by wax molding processes also and ofiers special advintages with these for some classes of wor Because of the prior inability to make sucplaces about the country has generally'le quired the reproduction of an original engraving or photo-engraving for each locality in which the electrotypes are to be used in order that electrotypes may be made from these, or the supply from one locality of all of the electrotypes intended to be used.

I provide master. electrotypes which are exact duplicates of the original engravings, of cuts of any character, or of type, or of a combination of these and which are capable of standing the same pressures and treatment as those to which original engravings may be subjected. The master electrotypes which I- produce are more rugged and will withstand more severe pressures andtreat ment than the cuts and type metal will stand.

In carrying outmy invention I make an impression in lead or in wax and hang this impression in the electrotyping bath to coat it, as in the case of an electrotype, making thewax surface conductive in the case of a wax mold as in all wax molded electrotyping work. However, 7 instead of stopping the electrolytic deposit at the usual thickness of approxlmately seven-thonsandths of an inch and backing up the copper shell thus made with electrotype. metal to, the printing thickness required, I deposit upon the electrotype a thickness of metal, preferably copper, such that there shall be room to take a finish out from the back and leave a final thickness equal to the standard thiclmess of an engraved plate, that is sixty-three thousandths of an inch. I find that seventy-three thousandths of an inch at the low spots is ample thickness to allow for this finish cut.

It must be remembered that I am dealing with printin surfaces which are peculiarly subject to mjuryby against them and that I must therefore take special care to prevent inju to the face in finishing the back, which in ury to the-face has been the controlling difiiculty inprior' efforts to produce such a plate.

In the plate seen in Figures 1 and 2 the printing surface is shown at 10 and the back of the plate is deposited to a thickness in excess of that shown at 11. The back of the late is then cut off to the level 11 to pro uce the finished thickness desired.

Where the master plate finished is that of an engraving or cut and is intended to take the place of the engraving or cut in a com-- plete plate made up in part of other electrotypes, it is very desirable that the master plate produced by my process shall have the same thickness as that of other engravings and this has led me to standardize the thickness of my finished plate as engraving thick- Y ness, notwithstanding that the greater part of my invention is independent. of this.

It will be sufliciently obvious that the type of metal used for the backing will determine the character of cutting tool most suitable for cutting the matel from the back to bring the plate to the required thickness.

reason of. pressure It will be evident that my backing method will apply to negatives as well as positives making finishe d backed negative or positive plates.

It will further be evident that my invention in the plate whether positive or negative is independent of the method by which the hard backing material is applied provided it be integrally united to the metal of the electrotype; and that the two metals need not be the same metal even where, as in the illustration given, the means of backing is by electroplating.

The master electrotypes described correspond absolutely with the engravings or other matter from which they have been produced and make it possible to combine with them cuts or other electrotypes and to reproduce with the same fidelity as from engravings.

It will be evident that I have made it possible to duplicate in lead molding for any number of printing electrotypes matter which must be wax molded initially or which will stand asingle lead mold impression only, with perfect registration securing good results. from typed matter and from composite plates; and that I can duplicate these as well as engraved originals in the form of master electrotypes. which duplicate originals can be distributed to electrotypers throughout the country for the production from each of as many electrotypes as may be desired with agreement of the reproductions from the different duplicateoriginals sufficiently not only for the reproductions from the same originals to register for color work but for the reproduction .from different originals to so register.

Where'I referin my claims to positive printing plates it is my intention to indicate plates which print from a raised surface as distinguished from plates of the intaglio class which print from a sunk d in which design the ink. is deposited an left for the printing operation after cleaning off tllietink from the non-printing surface of the p a It will be obvious that in view of my invention others skilled in the art will be able to secure all ora part of the advantage of mf-y invention without using the same form 0 the invention and it is therefore my intention to include herein all modifications and changes which come within-the reasonable spirit and scope of my invention.

Having thus described my invention what- --.electrotype adapted for lead process reproduction of positive printing plates and compositive printing plate having a copper backprising an electrotype face and a backing of ing cohesively united to it. 10

hard metal as distinguished from the normal 5. An electrotype shell provided with a I electrotype metal backing. (ohesively or integrally united backing of 5 3. As an article of manufacture, a copper hard metal to bring it to normal engraved positive printing plate having a stiff hard plate thickness. metal backing electrically deposited upon it. 4. As an article of manufacture, a copper JOHN J. WALSH.

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