US1992811A - Manufacture of cast type bars - Google Patents

Description

Feb. 26, 1935. CEUPPENS 1,992,811

MANUFACTURE OF CAST TYPE BARS Filed Sept. 16, 1933 Patented Feb. 26, 1935 UNITED STATES PATENT orrlce- MANUFACTURE OF CAST TYPE BARS Modesto Ceuppens, Brussels, Belgium, assignor to Linotype and Machinery Limited, London, 7

England, a British company Application September 16, 1933, Serial No. 689,714 In Great Britain September 23, 1932 6 Claims.

of by the formative cavities in the matrices.

' The formative cavities of the matrices usually employed are in the form of rectangular recesses bearing the character in intaglio at the bottom of the recess.

The casting of slugs bearing characters of the larger body dimensions is frequently effected by using a mold of a smaller body dimension than the characters, the face of each slug being th n produced with a character bearing portion overhanging the body portion; alternatively, slugs with characters of the larger body dimensions are cast in recessed molds, by which the wellknown ribbed slugs are produced. In both these cases, the metal on injection into the mold does not pass directly into the formative cavities of the matrices, and being diverted by coming into contact with the side edges of the matrices fails to reachthe bottom of the formative cavities under an even pressure at all parts thereof, so that the character face of each slug is not of uniform strength throughout.

Moreover, in the case of slugs where the characters overhang the body to a considerable extent, the slugsuare' of .very weak construction, inasmuch as, at the point of connection thereto ofthe characters (particularly those characters which have no ascenders) the slugs are of little more than paper thickness. Slugs of that construction are very easily damaged or deformed under the pressure to which they are exposed when used for indenting fiongs for the subsequent production therefrom of stereotype printing plates, and the ribbed slugs are also liable to damage under similar conditions at the abovementioned weak parts of the character faces.

The object of the present invention is to overcome the difiiculties. To that end it involves the routing out of portions of the matrices which are employed for the casting of characterswithout ascenders, so that at the casting faces of the matrices, the formative cavities are widened at the part adjacent the upper edges of the characters.

The invention will now be described with reference to the accompanying drawing in which:-

Figure l is a perspective view of a matrix of standard construction adapted to cast a character which is overhung from the slug and which is devoid of the support afforded by the use of the present improvements; 1

Figure 2 is a perspective view of portion of a slug cast from a line of matrices such as that shown in Figure 1;

Figure 3 is a transverse vertical section on the plane indicated by the crooked'line 3-3 of Figure 2 i Figure 4 is a perspective view of a matrix according to the present invention;

Figures 5 and 6 are views respectively similar to Figures 2 and 3, of a slug with the improvements resulting from the casting from matrices such as shown in Figure 4, the plane on which Figure 6 istaken, being that indicated by the crooked dotted line 6-6 of Figure 5;

Figure 7 is a vertical section showing the positional relationship between the mold slot and the formative cavity of a matrix, for producing a slug of the section shown in Figure 3; and

Figure 8 is a view showing a similar relationship in connectionwith the production of improved slugs such as shown in Figure 6.

Like reference numerals are used to indicate like or corresponding parts throughout the different figures of the drawing.

The matrices 1 involved in this invention are those which, when presented to the casting mold 2, see Figures 7 and 8, present part of the formative cavity 3, in offset relationship to the mold slot 4 in order that the resultant cast slug 5 will have its character-bearing,portion 5 correspondingly offset from the body portion 5, as indicated in Figures 3 and 6. For such casting, the mold is usually of smaller body dimension than the characters, but for casting slugs with characters of the larger body dimensions there are generally used recessed molds which result in the production of ribbed slugs; these ribbed slugs are so well known that it is believed that the following description which deals particularly with the casting of slugs of the smaller body dimensions, will suffice for a clear understanding of the application of the invention to the production of these larger slugs.

By referring to Figure 1 it will be noted that the routing of the formative cavity 3 is of substantially rectangular form with the character 3 in intaglio at the bottom of the routed recess, the character here selected for illustration being one which has no ascender. When a composed line containing such a matrix is presented to the casting mold for producing an overhung slug such as shown in Figure 2, the formative cavity 3 of that matrix is almost completely cut off from connection with the mold slot 4 as shown in Figure 7, so that the flow of metal into that cavity is seriously impeded by having to come into contact first with the edge of the matrixbelow' the cavity and thence be diverted into said cavity. This results in failure of the metal to reach the bottom of all the formative cavities under an even pressure, so that the character-bearing face of the slug is not of uniform strength throughout.

But, as next explained the chief objection incidental to the use of the matrices just previously dealt with, lies in the weakness presented by the extreme tenuity of the neck 5'" where: the overhang 5 unites with the body 5. Slugs so formed, are very easily damaged or deformed under the pressure to which they are exposed when used for'indenting fiongs required for the subsequent production of stereotype printing plates. Characters which have ascenders are not, however, fraught with the same danger for the reason that those ascenders extend across the tops of the slug bodies and therefore present a stout body of metal sufficient to prevent damage under the aforesaid pressure.

The main object of the present invention is so to shape the matrices of non-ascender characters, as to ensure that the parts of the over-hung slugs bearing those characters shall be united to the slug bodies by a suflicient bulk of metal to prevent them from being deformed under any pressure to which they may be ordinarily subjected in the course of stereotype production. Tothat end the wall of the recess 3 of each of the pertinent matrices (it is the wall corresponding to the ascender side of ascender matrices) is splayed outwards as shown at 6, so that a resultant slug will have its non-ascender characters united to the slug body 5 by a fairly substantial fillet of metal as at 5 Figures 5 and 6' sufficient to attain the desired rigidity.

It is to be understood that the routing at 6, may be of any desired form so as to produce fillets of the wedge shape indicated in the drawing, or of curved or other form.

Having described my invention, I declare that what I claim and desire to secure by Letters Patent is:

1. In or for a typographical composing and line casting machine adapted to produce slugs with type characters overhanging the slug bodies, a matrix for casting a character having no ascender, characterized by the recess which is provided with the character-forming surface being widened at the side adjacent to the top of the character to the same extent as the recesses in a matrix for casting a character having an ascender so as to produce a metal fillet which extends more or less across the top of the slug and unites together the overhanging and body portions of the slug.

2. A slug bearing typographical characters overhanging the slug body, characterized by those parts of the slug which bear characters having no ascenders, being reinforced by metal fillets which extend more or less across the top of the slug body to a point substantially coterminous with the ends of characters having ascenders and unite together those parts of the slug and said slug body.

3. In a typographical composing and line casting machine adapted to produce slugs with type characters overhanging the slug bodies, a matrix font including matrices formed on their casting edges with routing notches containing in their bottoms characters with and without ascenders, the routing notches of matrices having characters without ascenders being extended to have one side substantially coincident with the constant line of the mold to produce a slug having a uniform overhang and reinforcing fillets for said characters without ascenders.

i. A matrix font as set forth in claim 3, wherein the extended portions of the routing notches of matrices having characters without ascenders slope from the bottoms of the notches toward the casting edges of the matrices to produce a correspondingly sloped fillet.

5. In a typographical composing and line casting machine adapted to produce slugs with type characters overhanging the slug bodies, a matrix font comprising matrices formed on their casting edges with routing notches containing characters in their bottoms, some of the matrices bearing upper case characters and some lower case characters, and the routing notches of all of the matrices being of uniform vertical extent to produce a uniform overhang and reinforcing fillets for lower case characters without ascenders.

6. A slug bearing typographical characters overhanging the slug body, characterized by the uniform overhang of the characters and by those overhanging parts of the slug which bear characters having no ascenders being reinforced by tapering metal fillets which extend across the slug body to a point substantially coterminous with the ends of characters having ascenders and unite together said parts and the slug body.

MODESTE CEUPPENS.

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