US427682A - George a - Google Patents

Description

(No Model.)

G. A. GOODSON, A. S. GAPEHART 8: G. L. TRAVIS. ART OF FORMING MATRICES FOR STER-EOTYPB PLATES.

No. 427,682. Patented May 13, 1890.

UNITED STATES PATENT OFFICE.

GEORGE A. GOODSON, ALEXANDER S. CAPEHART, AND CHARLES L. TRAVIS OF MINNEAPOLIS, MINNESOTA, ASSIGNORS TO THE MINNEAPOLIS ELEC- TROMATRIX COMPANY, OF SAME PLACE.

ART OF FORMING MATRICES FOR STEREOTYPE-PLATES.

SPECIFICATION forming part of Letters Patent No. 427,682, dated May 18, 1890;

Application filed March 29, 1889- Serial No. 305,256. (No model.)

To all whom it may cancerm cardboard, paper, or papier-machin a com- Be it known that we, GEORGE A. GOOD paratively thin sheet. Instead of supporting SON, a citizen of Canada, and ALEXANDER S. this matrix-sheet directly on a solid unyield- CAPEHART and CHARLES L. TRAVIS, citizens ing anvil or support when making the im- 5 of theUnited States, residing at Minneapolis, pression, we place the same loosely upon a in the county of Hennepin and State of Minbacking-sheet of yielding material, preferanesota, have invented certain new and useful bly of little or no elasticity, and then place Improvements in the Art of Forming Mathis backing-sheet with the matrix-sheet upon triees or Molds for Stereotype-Plates; and it on arigid anvil or support The two sheets 10 we do hereby declare the following to be a are commonly held together by suitable full, clear, and exact description of the inguides or clamping devices at the edges, but vention, such as will enable others skilled in they are otherwise left free and unconnected, the art to which it appertains to make and so that ihesurfaces in contact can move one use the same. upon the other, and-the dies are preferably Our invention relates to the art of forming given such an extent of movement as to force molds or matrices for stereotype-plates to be the material of the matrix-sheet outward to used in printing, and more particularly to some extent into the yielding backing-sheet, that branch of the art in which the said maso that each impression will be represented trices or molds are made by impressing the on the reverse side by an elevation or em- 20 characters successively into the matrix mabossing.

terial. In molds or matrices made in the manner In order that the mold or matrix may be and of the material above described it is adapted to produce a satisfactory printingfound that the successive impressions are of plate, the characters must be sunk to a uniabsolutely the same depth and that they re- 2 5 form depth and must remain of their original tain their depth and form after the dies are form and depth until the cast is taken. It withdrawn. The matrix material being in a is found that when successive impressions thin sheet when placed in a suitable casting are made in materials having no elasticity frame or bOX,l)l19 weight of metal. used to whatever each succeeding impression crowds form the stereotype-plate will press the same 30 or forces the material back upon the previevenly against the supporting-surface upon ously-formed impression, distorting the botwhich it is placed, so that the resulting casttom and side walls of such previously-formed ing Will have the configuration desired and impression, so that perfect results cannot be the face of the type will be even and possess obtained. It is also found that under the all the requirements for the highest class of 3 5 conditions under which 1naterialssuch as printing.

Wood or card-board-possessing a certain In the accompanying drawings, Figure lie amount of elasticity have been heretofore a perspective View of the matrix-sheet, the employed, and under the modes of procedure backingsheet, the die, and the anvil. Fig. 2 heretofore followed in using the same, notis a partial elevation of the die with the ma- 40 withstanding the impressions all may have triX and backing sheets in section. Fig. 3 is been made of an equal depth, a plate cast a section through. the matrix-sheet. 9o therefrom will be found to have the faces of In the figures, A designates the die, B the the characters not in the same plane. The matrixsheet, C the backing-sheet, and I) the t printin -surface will, therefore, be uneven stationary anvil. During the formation of 45 and satisfactory results cannot be obtained the matrix as already stated, the sheet B lies therefrom. To obviate these difficulties when upon the backin sheet C, which in turn is 5 using this latter class of material is the obupon the rigid anvil D, as shown in Fig. 1. ject of our present invention, and in carrying With these parts in this position the die is the same into practice we prefer to employ forced or driven into the face of the matrixsheet opposite the anvil, so as to form a character matrix or indentation. It will be seen that the material of the matrix-sheet is forced downward or outward 011 the back opposite the character as shown at a, a corresponding impression being made in the face of the supporting or backing sheet, as shown at c. A portion of a completed matrix-sheet is shown in Fig. 3 with a matrix in one face and an elevation corresponding thereto on the opposite face.

It is to be distinctly understood that any form of machine for forming matrices or impressions may be employed and that any suitable material may be employed for the ma trix-sheets, care being taken that they shall be of such character as to receive and retain the impression of the dies and that the back ing-sheet shall be of a yielding character.

What we claim, and desire to secure by Letters Patent, is-

1. The method of forming stereotype molds or matrices, consisting in supporting a matrix-sheet of card-board or similar material on a second independent sheet of yielding material and embedding the dies successively into the face of the first-named sheet, substantially as described.

2. The method of forming stereotype molds or matrices, consisting in supporting two independent sheets of card-board or like material upon a fixed anvil or support and embedding the dies successively into the face of the upper sheet, substantially as described.

3. The method hereindcscribed of forming at. In the art of formingmatrices for stereotype-plates, the process of forming card-board or analogous matrix-plates, which consists in supporting the matrix card or sheet on a yielding bed and forcing the dies successively into the card or sheet so as to form embossed portions on the reverse side of the card or sheet, substantially as described.

5. In the art of forming matrices for stereotype-plates, the process of forming card-board. matrix-plates, which consists in supporting matrix cards or sheets on a rigid bed with a sheet of similar character interposed between them and forcing the dies successively into the card or sheet to an extent sufficient to produce embossed or erected portions on the reverse side of the matrix card orsheet.

In testimony whereof we affix our signatures in presence of witnesses.

GEORGE A. GOODSON. ALEXANDER S. CAPEHART. CHARLES L. TRAVIS.

Witnesses:

ROBT. F. GAYLORD, W. H. CHAPMAN, PARKER M. PAGE, FRANK HARTLEY.

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