US1747773A - Type-matrix-forming punch - Google Patents

Description

Feb. 18, 1930. I HEDLY 1,747,773

TYPE MATRIX 2 0mm runcn Filed Aug. 13, 1927 2 Sheets-Sheet 1 IHIIIHHIHIHHIHIIHJi I fimwzz ar.

Feb. 18, 1930. A. H. HEDLY 1,747,773

TYPE MATRIX FORMING PUNCH Filed Aug. 15. 1927 2 Sheets-Sheet 2 a I l x. \V i A1 J2 17 252519 WZZW,

Patented Feb. 18, 1930 STATES FATE oFFIcE ARTHUR HEDLY, OF CHICAGO, ILLINOIS, ASSIGNOR TO LUDLOW TYPOGRAPH COM- PANY, OF CHICAGO, ILLINOIS,

A CORPORATION 015 ILLINOIS TYPEMATRIXFORMING PUNCH Application filed August 13, 1927. Serial No. 212,800.

My invention relates to the manufacture of type matrices involving the formation of the matrices by forcing into a matrix block, as for example of brass, a punch provided with a punch-surface conforming to the form of type face to be cast in the matrix.

The type to be'cast often present relatively narrow printing surfaces sometimes of ha1rline width, requiring that the punch, for forming the matrices, in which such type are to be cast, present thin punch portions rising from the body of the punch and of slightly converging form in cross section.

As punches for such purpose have been provided hitherto the side surfaces of these relatively thin punch portions are plane, uninterrupted, surfaces ;-and in the use of such punches, particularly where the matrixblanks are 'confined'against deformation at their side and bottom surfaces during the forming operation, it has been found that the metal of the matrices at the bottoms of the cavities formed by these relatively thin punch-portions is often-times so stressed as to produce complete fracture of the matrices along conver ing lines resulting in the separation therefrom of wedge-shaped bodies at said portions and rendering the matrices unfit for use.

My object is to overcome this difliculty which is accomplished in accordance with my invention by providing these relatively thin punch-portions with stepped or shouldered, side surfaces where they penetrate the matrix blanks in the forming operation, resulting in so distributing the stresses on the matrix blanks that the metal remains unfractured,

and smooth, enduring cavity-bottom surfaces result.

Referring to the accompanying drawings: Figure 1 is an enlarged face view of a punch-member which may be employed in utilizing my invention. Figure 2 is a sectional view of the punch-member, the section being taken at line 2 on Fig. 1 and viewed in the direction of the arrow. Fig. 3 is a broken sectional view of the matrix formed from the punch. Figure 4 is a broken plan view of matrix-blank holding mechanism which may be used for holding the blank during the punching operation; and Figure 5, a section taken at the irregular line 55 on Figure 4 and viewed in the direction of the arrows.

I have chosen to illustrate my invention, by way of example, in connection with a punch for producing a matrix in which a capital letter WV is to be cast, the letter being formed of relatively wide-line portions and relatively narrow, hair-line, portions. The punch to form the matrix-cavity in which type presenting a printing-face conforming to such a letter is to be formed, is represented at 5 and is formed with a matrixblanlcpenertating portion the terminal face of which conforms in outline to the outline ofthe letter to be cast in thematrix formed by the punch. Thus the terminal face of the punch presents the relatively wide portions and the relative thin portions 6 and 7 corresponding respectively with the wide and thin lines of the letter referred to.

, The metal ribs represented at 8 and rising from the body of the punch and presenting. the; relatively wide terminal faces 6 are of wedge-shape in cross-section with their side surfaces plane, uninterrupted, surfaces as is common practice in punches of this general character. The ribs represented at 9 and rising from the body of the punch and presenting the relatively narrow terminal faces 7 are of general wedge-shape in cross-section. but

their side surfaces, instead of being plane, uninterrupted, surfaces as in the case of the ribs, arestepped between the terminal faces thereof and the body of the punch to present laterally-extending shoulders, or steps, 10 which, following the initial operation of forcing the punch into thematrix-blank, the latter being confined against lateral deformation at its side and bottom surfaces in any desirableway, engage the matrix-blank and in con tinuingthe forming operation act against, and deform, the metal of the blank, within the confines of its sideand bottom surfaces, with the result that the metal in which the type-forming mold-cavity is formed remains unfractured and a perfectly-formed, enduring matrix is produced.

In Figs. 4 and 5 I have shown means which may be utilized for holding the matrix-blank while being punched and which serve to hold the bank against free lateral and downward flow of the metal thereof during the penetration of the punch. The means shown are of the construction disclosed in my United States Letters Patent No. 1,237,643, dated August 21, 1917, so that a brief description only thereof will sufiice.

The mechanism shown comprises a bed 11 superposed by a block 12 rigidly secured thereto as by screws, this block having one corner thereof recessed as represented at 13, the walls of this recess and represented at 14; and 15 extending at a right angle to each other and being lined with bars 16 and 17, the block 12, lined as stated, constituting one jaw of a chuck in which the matrix-blank is to be held. The other jaw of this chuck, represented at 18 and formed with an apex portion 19,

is guidingly confined at its outer end in parallel guides 20, so disposed that the jaw is movable from the closed position shown in Fig. 4 into open position, and vice versa.

The extreme apex portion 19 of the jaw 18 contains .a recess 21, the side wall 22 of which is parallel wtih the inner face of the plate 16, the recess 21 containing a block 22 held in place by a screw device 23, the outer face 24 of the block 22 being parallel with the inner face of the plate 17. There is'thus provided between the plates 16 and 17, the wall 22 and face 24 of the block 22, a recess 25 in which the matrix-blank, represented at 26, is located.

The bottom of the blank 26 rests upon a rigid foundation which, in the case of the particular machine shown is a hardened steel plate 27 carried on the upper face of a matrix ejector 28 slidably mounted in the bed 11 of the machine, this ejector, in the operation of punching the matrix blank extending into the position shown in Fig. 5.

In the operation of the mechanism shown the jaw 18 is withdrawn from the position shown in Fig; 4 to permit of the introduction of the blank 26 into the recess 25 and the jaw 18 thereupon forced inwardly to the position shown in Fig. 4 by any suitable mechanism, as for example by the pneumatic mechanism shown in said Letters Patent, to firmly clamp the blank 26, the side walls of the recess 25 and the portion of the machine upon which the blank rests serving to prevent free lateral and downward, flow of the metal of the matrix-blank in the operation of forcing the punch 5 into it to form the mold cavity.

What I claim as new and desire to secure by Letters Patent is:

1. The art of forming matrices which consists in forcing into the blank from which the matrix is to be formed and of such metal that fracture thereof occurs in the matrixforming operation, at the bottoms of the relatively narrow matrix-cavities thereof, a punch having a relatively thin characterforming portion on its face the side surfaces of which are of stepped form providing laterally-extending shoulder-portions.

2. The art of forming matrices which consists in forcing into the blank from which the matrix is to be formed and of such metal that fracture thereof occurs, in the matrix-forming operation, at the bottoms of the relatively narrow matrix-cavities thereof, a punch having a relatively thin character-forming portion on its face the side surfaces of which are of stepped form providing laterally-extending shoulder-portions and presenting die portions for forming all of the matrixcavities, thereby simultaneously forming all of said cavities.

3. The art of forming matrices which consists in forcing into the blank from which the matrix is to be formed and while confining the blank against free downward and lateral flow of the metal thereof, a punch having a relatively thin character-forming portion on its face the side surfaces of which are of stepped form providing laterally-extending shoulder-portions.

4. The art of forming matrices which consists in forcing into the blank from which the matrix is to be formed and while confining the blank against free downward and lateral flow of the metal thereof, a punch having a relatively thin,character-forming portion on its face the side surfaces of which are of stepped form providing laterally-extending shoulder-portions and presenting die portions for forming all of the ma rix-cavities, there by simultaneously forming all of said matrixcavities.

ARTHUR H. HEDLY.

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