US947264A - Apparatus for producing depressions in metal printing-plates. - Google Patents

Description

M; WAGHSMUNDT, A. KURZ & G. JAGOBI. APPARATUS FOR PRODUCING DEPRESSIONS IN METAL PRINTING PLATES.

APPLICATION FILED AUG. 4. 1909 Patented Jan. 25, 1910.

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M. WAUHSMUNDT, A. KURZ & G. JAGOBI. APPARATUS FOR rnonncma DEPBESSIONS m METAL PRINTING PLATES.

APPLICIATIOH FILED AUGJ. 1909. 947,264. Patented Jan. 25, 1910.

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max wncnsmonnr .AND AL'WIN KURZ, 0F BERLIN, AND CARL JAGOBI, OF SfiDENDE, NEAR BERLIN, GERMANY.

APRA BATUS FOR PRODUCING DEPRESSIONS IN METAL PRINTING-PLATES Specification of Letters Patent.

Patented J an. 25, 1910.

Application filed August 4, 1909. Serial No. 511,1201}.

i l l l i i It has been attempted to produce depressions in metal printing plates, by hammering, With the assistance of special apparatus, or by rolling, by means of cylinders, or by stamping entire Words in one operation. All

such prior apparatus, because of great drawbacks, have not led to any useful results. The hammering process has the tltflwlmflli that the depressions are not uniformly deep, and that the top surface is deformed by depressions etc. The same drawbacks occur in the rolling process, which has the further drawback that the stamps are easily do formed and that no accurate adjustment of the words can. be effected.

, When simultaneously stain ing several letters forming a word, it is di cult to obtain a uniform depth. Moreover, owing to the great pressure required both surfaces of the plate are very easily bulged or rendered uneven, which is of reat disadvantage in the printing process. VVe overcome these drawbacks, and also accurately adjust the depressions, and also of the stamp spindle. According to our invention, the depressions in the metal plates, such as copper, steel, iron, zinc, brass etc., are not. obtained, as hereto fore, by engraving or by stamping entire words in one operation, but separate constituent parts, such as letters, or signs (for example, music, or decorative matter) are stamped one after the other in the metal plates, in order, by thus singly making; such impressions. to form entire words, signs. or entire printing plates.

By so doing,we have found that all deformation of the surface of 1 the printing plate, such as b 'llges or unevennesses, are avoided, and that the depth of the various depressions, as Well as the place, at

which they are applied, can be accurately adjusted.

\Ve are aware that stamping apparatus already exist, which enable several single depressions to be made one after the other in a metal plate, but still such devices can only be used for copying, while, according to our present invention, the separate types can be combined according: to desire and used for producing quite different original plates.

Our machine, which enables names etc. to be indented in printing plates, is shown in Figure l in plan, in Fig. 2 in side elevation. and in Fig. 3 in front elevation, while Fig. 4 shows the pressing piece in plan, Fig. 5 in front elevation and Fig. (l in side oleva tion.

a is the base plate, which carries all the working parts of the ma chine and also serves a support for the copper plate to be indented. The slide carriage I), which is adapted to be moved, lengthwise of the base plate, by the toothed wheels I, engaging in the toothed racks ll. and is guided in grooves of said base plate. Said toothed wheels I are secured on the shaft I which is jonr nalcd in the bearings Z. At each end of the shaft there is a slot V, in which a pin on a crank Vi can engage, and by this means. the shaft can be operated from either of its ends. A second, and smaller, slide or carriage #1 moves in grooves of the carriage h, and at right angles to the movement ofthe latter. A standard {3, together with a spindle Vlll. and lly-lerer, f, are adapted to be n'lov'cd lengthwise of the slide or carriage (a and backward and forward, by a spindle 2'. This spindle i is journaled in bearings 2 and I. and is adapted to be turned by the hand wheel in through the agency of the toothed wheels X and j, the latter of which is journaled in the top part of the hearing 7. The aforesaid spindle Vlll in the standard (1 carries at its lower end (Figs. 5 and l), pressing piece or lining: IX, which is held to tliespindlc by a pin XI passing tin-(nigh a groove around the latter and through the pressing piece itself. In order to prevent the pressing piece IX from turning during the hereinafter-described stamping opera- I ings a are provided in the standard d. At

- pointer, t, fitted within the slot of the typetion, a. longitudinal guide is rovided in the standard (1, through which t ie pin 112 (Fig. 1) passes, and the lower half of the pin fits the guide hole XII (Figs. 4, 5 and 6) of the pressing piece IX.

A type holder 6 in the slide 0 is kept in a perpendicular or parallel position in regard to the base plate a by four screws 0, in order to assure that the type to be indented always 1 act perpendicularly on the copper plate. For the purpose of printing the names in proper position on the copper plate there is a pointer it inside the type holder 6. The screw g provided with the screw head VII passes through the screw threaded guide It, opens out into the slot of the type holder 6 and presses against the lining 8. By the screw g the types inserted into the holder e g are, pressed side by side, in such relation, i however,'that they can be pressed down one at a time.

Before beginning the stamping operation, the carriage b is secured by the screws III and the carriage c by the screws in in order to prevent these carriages from being displaced. The spring 9 (Figs. 1 and 3) is provided in order to keep the carriage c, at right Y angles while sliding on the carriage b. For the purpose of rendering the results of the stamping operation visible, inclined openthe top of the latter is secured the circular scale 1, which, together with a pointer '11 (the latter depending from the fly lever, f), enables the depth of the letters to be regulated. On the scale 2' is also provided a loose pointer .20, which to avoid mistakes is'adjusted to the numeral in question. The clamps IV (Figs. 1 and 2) overhang and serve to secure the copper plate.

The operation of the described machine is as follows: Supposing it is desired to stamp a name at a certain point on a. copper plate, the latter is placed on the base plate a and fastened by the clam 5 1V. Thereafter the type holder 6 is ad]usted to the point at which the stamping is to be efiected the holder, (2, being above the desired point at which the stamping is to be commenced, whereupon the type coming into question for the particular name are composed and put into said slot, and held in place by the screw The standard (I is then moved so that the pressing piece 1X brought exactly over the middle of said type composing said name, whereafter the spindle-is screwed down and one of the type is thus pressed to the desired depth into the plate. When this has been done, the spindlb is screwed up again and adjusted to act on the middle of another of the type, which operation is repeated until the whole row has been printed one by one. As

soon as the name is finished the bur is ground oil", and the plate is then ready for printing.

In order to be able to accurately adjust the point, at which the indentation has to be made in the plate, the carriage b can be moved along a scale XIII rovided on the base plate IQ, a pointer xn being provided to facilitate the adjustment. Further the carriage a can be moved with the assistance of a second pointer XV along a second scale XVI provided on the carriage I). These' scales XIII and XVI are disposed at an angle to each other, so that an accurate adjustment of the type can be efi'ected both longitudinally and transversely.

Instead of longitudinally and transversely adjusting the stamping device b the above described means, the process can e reversed, that is 1p say, the stamping device may be made stationary and the metal printing plate can be adapted to be adjusted underneath the stamps. The pressure may also be exerted in the opposite direction, so that, instead of the type being moved toward the plates, the plate may be moved toward the type, it being in both cases of no moment, whether the pressure between the type and the plate is etfected by mechanical pneumatic hydraulic or electric meansr What we claim is:

1. In an apparatus for reducing depressions in metal printing p ates, a base plate serving as a support for a metal plate, a carriage slidable on said base-plate, a second carriage slidably carried by that first named and movable thereon at anangle to the path of travel of said first-named carriage, a typeholder on. the second-mentioned carriage, a standard supported by said second-named carriage and slidable thereon, a spindle ca'r-' ried by the standard, and a pressing piece on the spindle and adapted to press against type, when in said holder, against a metal plate when supported by the base plate.

2. In an apparatus for producing depressions in metal printing-plates, a carriage provided with a type-holder, a standard carried by and slidable on said carriage, a spindle carried by the standard and adapted to press against type, when in said holder against a metal plate.

ln an apparatus for producing depressions in metal printing-plates, a standard, a plate carried thereby and bearing a scale, a loose pointer movable relatively to said scale,

a spindle in the standard, a fiy-lever for m0v-- ing said spindle in said standard, and a second pointer carried by the spindle and movable relatively to the scale and independently of the first-mentioned ointer.

4. In an ap aratus or roducing depressions in meta printing-p ates, a base-plate bearing a scale, a carriage movable and also bearing a scale, a pointer carried by uur hands: in the presence of two subscribing l the carriage for indicating markings on the wiinvssvs. first-named scale, a second carriage movable i MAX VVACH SMUNDT. at an angle to the path of that first named, GAVIN KURZ. 5 and n pointer carried by said second car CARL JACOPJ.

riage for infhmting markings on the second- \\"ituesses: named scale. FRANZ SPHWENTERLEY.

In witness whereof we have hereunLo set HENRY HASPER.

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