US1494782A - Flanged printing plate - Google Patents

Description

F. C. GOLDENBAUM FLANGED PRINTING PLATE Filed Sept. 8 1920 INVEIiITOR mum's Patented May 20, 1924.

UNITED STATES PATENT OFF-ICE.

FREDERICK C. GOLDENBAUM, OF KEARNY, NEW JERSEY, ASSIGNOR TO INTERNA- TIONAL PRINTING PLATE COMPANY, INC., OF NEW YORK, N. Y., A CORPORATION or NEW YORK.

FLANGED PRINTING PLATE.

Application filed September 8, 1920. Serial No. 409,010.

To (all whom it may concern:

Be it known that I, FREDERICK G. GOL- DENBAUM, a citizen of the United States, residing at Kearny, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in Flanged Printing Plates, of which the following is a specification.

This invention relates to printing plates of the type that is provided with flanges by means of which the plates may be attached to suitable supporting blocks.

It has heretofore been the practice in employing printing plates of non-metallic sheet material, such as celluloid, to provide two opposite edges of the plate with flanges which were arranged either in parallel and offset relation to the main body of the plate or at substantially right angles thereto. The most common way to fasten the flanges to the wood supporting blocks has been by the use of tacks or nails which were driven through the flanges into the edges of the block to thereby secure the plate in place.

The flanging arrangement referred to is open to the objection that a substantial amount of time is required to fasten a plate to a block and that it is diflicult to remove the used plate and secure another plate in its place. In addition, the use of two flanges has not been wholly satisfactory in that the lateral sweep of the printing and the inking rolls tends to lift one of the free edges of the relatively flexible plate and thereby permit ink to accumulate under the edge of the plate and to otherwise interfere with a printing operation.

It is the obiect of my invention to provide a flanged printing plate which will be free from the objections referred to.

I have discovered that by providing a printing plate of the general type described with flanges having an inwardly converging relation to each other, and making use of a supporting block having grooves formed to receive the flanges in an interlooking or dove-tailed relation, an arrangement is secured by which a plate can be attached to or removed from a supporting block with a minimum expenditure of time and trouble.

In the drawings:

Fig. 1 is a view in perspective of a flanged printing plate embodying the invention.

Fig. 2 is an end view of the flanged plate shown in Fig. 1.

Fig. 3 is a view in perspective and partly broken away of a flanged plate mounted on a special supporting block.

Fig. 4 is a transverse sectional view of the mounted plate shown. in Fig. 3.

Referring to the drawing, there is shown in Fig. 1 a printing plate 1. formed of celluloid or other sheet material and provided along three edges with inwardly directe'l flanges 2. Preferably, the angle which each flange makes with the body of the plate ap proximates forty-five degrees, but it will be obvious that different degrees of augularity may be utilized so long as there is inward inclination from a right angled position. It will be clear also that the flanges may be provided with curves or corrugations or other formations designed to provide a locking connection with a suitable supporting block.

In Fig. 3 of the drawing there is shown a printing plate provided with inwardly inclined flanges such as have been referred to. the plate being mounted on a supporting block 3 provided near three of its edges with inwardly directed grooves 4 into which the flanges 2 on the plate 1 may be snapped to thereby hold the plate in immovable re-; lation on the block during the operation of printing. It will be seen that the furniture or blocks may be formed in different columnar widths and of any desired length, and that standard widths of blocks may be kept permanently on hand on which new plates may be substituted for old ones from day to day or as often as required.

I find that by providing flanges along three edges of the plate, instead of along only two opposite edges, as in the old prac tice, a construction is secured which is effective to prevent the lifting of an edge of the plate by the lateral sweep of the print ing members. This overcomes a serious defeet in plates of this general type known. n the prior art in which the action of the press lifted an edge of the plate intermediate the flanges and not only permitted the deposit of ink thereunder but which Was also a frequent cause of distortion and even 5 breakage of the plate.

W'hatI claim is:

A printing plate formed of flexible nonmetallic sheet material and having flanges formed at an acute angle to the body of the plate along three edges thereof, in combination with a supporting block for the plate having inwardly directed grooves formed to receive said flanges and have supporting engagement with both surfaces thereof.

FREDERICK C. GOLDENBAUM.

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