US1422136A - Matrix manufacture - Google Patents

Description

[W W; w H 4 J. L. ROUSSEAU. MATRIX MANUFACTURE. APPLICATION FILED AU'GH. 1921.

1 422 136 Patented July 11,1922.

H IIHI ATTORNEVJ' .Tso s'rrss JOSEPH L. ROUSSEAU, OF BROOKLYN, NEW YORK, ASSIGNOR TO MERGEIITHALER LINOTYPE COMPANY, A CORPORATION OF 1,a22,1ae.

Specification of Letters Patent.

NEW YORK.

; Patented July 11, 1922.

Application filed August 1, 1921. Serial No. 488,885.

T 0 all whom it may concern Be it known that I, Josnrrr L. Rousseau, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Matrices Manufacture, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to matrices, such as are used in commercial linotype machines for the casting of type bars or slugs. These matrices, as heretofore made, have their character impressions located in the bottom walls of so-called routing notches formed in the casting edges of the matrices, so that the ordinary slug, which is'cast from such matrices, has its type characters mounted on pedestals rising above the quad line of the slug, the pedestals of'course being cast in the routing notches. In printing from slugs of the above description, it frequently happens that theink accumulates on the pedestals and finds its way onto the printed sheet, thus producing what is known as smutting. This is particularly true of the larger or more open characters, which necessarily expose a considerable portion of the pedestal surface both inside and outside of the type characters. My present invention is intended to obviate the foregoing objections, and to that end, I propose to manufacture the matrices in such manner that the customary routing notches may be entirely eliminated. By thus doing away with the routing notches, the slugs may be cast without pedestals and the cause of.

smutting thereby removed. 7

The precise ,mannerin which the foregoing results are accomplished will be best understood from the detailed description .to follow. p 7 Referring to the drawings:

Figs. 1 to 4 show on an enlarged'scale a matrix in different stages of manufacture;

Fig. 5 is a matrix; 7

Fig. 6 is an enlarged side elevation of a portion of a slug bearing type characters, some of which are cast from ordinary matrices, and others of which are cast from perspective view of the finished natrices produced in accordance with my invention; and

Fig.-,7 is a face view of Fig. 6. The first step in my improvement consists in providing a suitable over-sized blank, such as that shown-in Fig. 1. As will be observed, this blank A is formed on its character edge with a pad or raised portion B which is intended to add enough excess metal to that edge of the blank to permit the subsequent operations hereinafter descrlbed. The pad B is shown as extending throughout the length of the blank edge, as preferred, but it might suflice to have it located merely in the vicinity of character lmpression. The blank is produced in the regular way, namely, by stamping it out of a bar or sheet of raw material (brass), and then,.if desired or necessary, trimming it down to the desired size.

The second ste consists in forming a very shallow notch C in the character edge of the blank, as by cutting or routing out a portion of the pad B, in the manner indicated in Fig. 2. In this figure, the final edge of the matrix is generally indicated'by the dotted line D-D, and it is pointed out that the notch C stops short of this final matrix edge The purpose of cutting out the notch C is to remove or take off the tough outer skin of the blank edge and to expose a softer bed of metal for the punching of the character impression. By wa of explanation, it may be stated. that the stamping out of the blank and the subsequent-trimming'operations have the effect of condensing or compacting the metal along its edges, thus rendering it difficult to drive the punch directly into the edge of the blank with satisfactoryresults. This difliculty is herein overcome, as above indicated, by taking off the tough outer skin of the blank edge, which is permitted by producing the blank inits' ori inal form with the pad of excess metal before mentioned.

The third'step consists in punching the character impression E in the bottom wall of the notch C, which operation as just explained may be successfully performed by reason of the comparatively soft condition of the metal exposed to the action of the punch. It will be noted that the character impression E is driven below the final edge of the matrix as indicated generally by the dotted line D-D, the depth of the strike being such that the face of the character impression will be located at the standard 7 matrix edge.

the milling operation.

distance from the final matrix edge which in this country is.043.

The fourth and last step of my improvement consists in dressing down the edge of the blank to produce the final m'atrixedge,

or more specifically, in millin down the ad B to the dotted line D n. This is cone with the aid of suitable gage devices,

which determine the exact amount of metal to be removed in arriving at the final matrix edge. The effect of such step is indibe no excess of metal at that point to be removed. However, the mode of procedure described is preferred, as any distortion of the metal during the punching operation is thereby remedied *the milling process.

It will berund'erstood that my improvement deals only with'one phase of manufac ltev and that various other operations must be performed on the blank, in addition to thoseabove described, to bring it to its final form as shownin Fig. 5. These operations are well known to those skilled in the art and therefore require no mention.

The effect of my improvement is illustrated in Figs. 6 and 7, which show a slug F bearing onitsmpper edge a line of type characters, those marked l'being produced from the newmatrices and-those marked 2 being produced. from the old matrices. As will be observed, the characters 1 are cast directly on the, edge of the slug body, whereas the characters'Q are'cast on pedestals 3 rising from said edge. In printing from the characters '2, therefore, smutting may occur, due to the presence of the pedestals 3, but no such objection may arise in the case of the charactersl, due to the absence of the offending pedestals. It is pointed out,

however, that the type characters in either case have their" printing faces arranged at the same level or at thesame distance from the quad line'o-f the sl1 1g,"so that matrices made in accordance with my improvement may be used freely with any of'the old matrices and also with the standard form of mold employed in the commercial linotype machines. 7 7

While I have set forth the several steps which I propose to follow, these steps might bevariously modified as -to sequence or otherwise without departing from the spirit of my invention. I' therefore desire it to be understood'that I do not limit myself to any specific mode of procedure except in so far as such limitations are specified in the claims. It should also be understood that, although 'herein'illustrated in connection with a matrix having a single character, the invention is equally applicable to matrices having two or more characters.

Having thus described f my invention, What I claim isias follows; i

1; In the art of'manu-facturing matrices,

providing an'oversizedblank, forming in the edge "of said blank a notch of a depth not to extend below the final edge of the matrix, punching the character impression in the bottoin' wall ofsaid notch andof a depth to extend below the finalmatrix edge, and

thereafter dressing-down the blank edge to produce the finalmatrix edge-J 2. In the art of manufacturing matrices, providing a blank with a pad of excess metal on its character edge, forminga notch in said pad, punching the character impression in the bottom wall of saidnotch, and thereafter dressing down the padof excess metal to eradicatefsaid notch and to producethe fi'nal matrix edge;

matrices,

bottom wall of'said notch and of a 'depth. to

extend below the finalmatrix edge, and thereafter milling down the blank edge to produce the final matrixedge.

"5.1111 he art or ufacturing matrices, providing a blank withia pad of iexcess metalonits character edge, punchingthe character impression through said pad of excess metal and ofadepthfto exten d below the final edge of the matrix, and thereafter dressing down the pad of excess metal to produce said final matrix edge. I

'In testimony whereof, I have aflixed my signatiirehereto. 5

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