US2348630A - Apparatus for making stamps - Google Patents

Description

y 9, 1944; H. s. JONSSON 2,348,630

APPARATUS FOR MAKING STAMPS File'd' June 7, 1941 2 Sheets-Sheet 1 fiffgge 5 J71 550/2,

y 9, 1944- H. s. JONSSON APPARATUS FOR MAKING STAMPS 2 Sheets-Sheet 2 Filed June 7, 1941 fizz/672.1%" 152 5576 5 K767256022,

Wdkeaa Patented May 9, 1944 UNITED STAT E S PAT ENT GF Fl-CE iii rimircs ron MAKING (STAMPS -ilel'ge' S. tlonssomv illal a'rk, Ill. Alppliation' June '1, 1941,"seria1 No.397143 scam. (c1.101-4) My invention relates to the fineth'od of making stamps or dies, "as well as apparatusffor making stampssuch as printin stamps, punches/type wheels and the like.

The invention inexpensively manufactured and economically operated. t i H: i

The invention has particularlyasan object the production of an apparatus which wilrdi'r'ect a light weight projectile provided wima die or matrix at veryhigh'velocityagainst a bl'ank It is the purpose of the'app'aratusto discharge and direct the matrix carrying projectile against' the die blank in such a manner as to form' a" clear, sharp impression on theblankfwithout in'any way injuriously distorting theblank otherthan distorting to'foim'the impression thereon.

The invention has as anobje'ct the production of an apparatus in'which the'matr'ix carried by the projectile strikes the blank but once rather than with a plurality of successive blows, and differs from any other apparatus that is knowntome in that item'ploys a'very lightprojectile rather than a heavy "weight; thetraLvel of the projectile being somewhat similar to the travel of' a lightweight'bullet discharged fro'rnfa rifle.

Many other objects and'advantages of the construction herein shown and "described will be obvious to those skilled in the art from the disclosure hereingiven. I V

To' thisendmy invention consistsfin thehovel construction, arrangement and combination "of Fig. 4 is afvertical section substantially tag.

v 3 but revolvedninetyd'grees' with respect there- Q I P.) H

'Fig. '5 isa perspective gview of'the' progectlle or matrix carrier shown'in Fig.3;

Fig.16 is a perspective view of a portion of a iemen p m dbvith pemti has among itsobjects an irhprovedeconomical method or process of making such devices, as well as an improved "apparatus "which is simple, eflicie'nt durable, which maybe Y Fig. 8 is a perspective view of a modified form of projectile.

"Referring to the drawings, first to Figs. 5 and 6,I-represnts a stamp or die as formedfi'being thecharacter formed at one end thereof. This impression of the desired characteris formed-by meansof a matrix or die- 3 bearing the character to be reproduced.

7 Referring now'to Figs. 1 and 2, II repiesentsja frame whichis provided with a base portion I2 adapted to be supported b-y-the legs I3. The frame is provided with a head I I at the end which carries a'blankholder for the blanks! as'will be hereinafter described.

Arranged in-the frameis what ma be termed a barrel I5, the-lower en'd ofwhich is secured in a centering plate I6 secured tothe base 'pIateI'Z by studs I! or in an equivalent manner. As shown, the plate I'2gis-providedwith anbpening 'I9 ther'ethr'o'ugh and-the member I6 wi-th'a depending portion I8"extendirig through the opening I9. The upper end of the barrel I5exter'ids through asleeve 2| which is carriedb the part flZII-on the'frame,the samebeing centered and -lield fir'mly in place by means of set screws '22 or the'irequivalent.

hrrangedwithin the-barrel is the projectile 24. Where the projectile is cylindrical in shape I prefer to provide a-key' 25 and groove the interior of the barrel as indicated at 26 so that theprojectile'can'not rotate within the barrel during its travel, but is always presented to the'blank in the same position.

Arranged at the lower end of the barrel and carried-by the portion I8 of the plate I8 is a valve 'casing or housing 2? which is provided withthe extension portion 28 threadedly engaging; in the part I8. Within the bore of the housing 21 is arranged a valve 29 provided with pasand ""55 sageways 3| which may be brought into registry .with. the ' ports 32 and 33 in the housing 2'1. Port 33 communicates with the interior of the barrel I5, while port 32 communicates with the storage tank or receptacle 35, constituting an air reservoir for containing compressed air which 7 may be supplied through a pipe 36 or the equivalent There is also provided a suction pipe 3"! communicating with the interior of the housing through which air from the interior of the barrel may be drawn out when the projectile has "traveled outwardly "from the valve housing and carried the matrix or die to the blank to be formed and-the air pressure from the air reservoir 35 "'h st'e s'hut arr. r

The Valve" ZQ iS BZ quick ab ting valve; that 1st!) say, it opens quickly to admit a shot of air under high pressure to the barrel and thereafter quickly shuts to relieve the pressure on the projectile. While an suitable valve mechanism may be employed for the purpose, I have illustrated valve 29 provided with a stem 39 which projects through the housing cover plate 30 at one end of the housing and is secured to a valve operating arm 40. As shown, a bracket 38 is carried by the base [2, this bracket being recessed to receive the arm 40 secured to the shaft 39 by a pin 4| or the equivalent. The free end of the arm 40 is connected to a bracket 45 by means of a spring 44. The bracket 38 is provided with stops 42 and 43 for the arm, the arrangement being such that when the arm is in the position shown in Fig. 1 the valve is closed. The arm 45 is mounted on the shaft 46 and connectedthrough a link 41 to a foot pedal lever 50 at 49. A spring 53 arranged between a collar 54 on the rod 45 and the base I2, tends to normally maintain the rod and arm 45 as shown in Fig. 'When the foot pedal lever 50 is depressed, arm l5 moves downwardly past the end of 39, and as soon as it passes the dead center, the spring 44 tends to snap the valve into its open position, discharging the air under pressure to the barrel l5 whereupon the projectile is shot outwardly at high velocity. As soon as the projectile is shot, the foot pedal 50 may be released and the rod 46 is thereby released automatically through the action of spring 53 causing the return of the pedal, and rod 46 is then permitted to move upwardly, carrying with it the arm 45. The valve arm 40 is thereupon again moved past the dead center and the valve snaps shut the passage to the tank or reservoir 35, so that the interior of the barrel is open to suction pipe 31, or atmosphere. It is preferred to snap the valve shut substantially about the time the projectile passes the port hereinafter referred to. Due to suction and gravity, the projectile in the mean-time has dropped down to the position shown in Figs. 3 and 4.

Carried by the head l4 of the frame is a shaft 55 which carries a blank holder 56 which is preferably rotatable with the shaft. The blank holder 56 is provided with the extended portions 51 in which the blanks I may be positioned. The turret or chuck 55 carrying the blanks may be turned manually, as shown, or in any other suitable manner. In order to align the blank with the projectile, I have shown a plate 58 secured to the shaft 55, the same being provided with an opening 59 for each blank holder. The rod 46 is connected at 65 to an arm 62 pivotally secured on the frame at 63. The end is bifurcated and receives a pin 64 on a small rod 60 carried. by the bracket 5|. When the foot pedal lever 50 is depressed the rod 65 is raised, engaging the member 58 in one of the holes 59, looking the chuck or turret against movement while the lever is depressed and the-stamp being formed.

I have shown at the outer end of the barrel l 5 a cap 61 and gasket 68, the cap being provided with an opening 69 of a size to permit the matrix 3 to pass therethrough when the valve is opened and the projectile thrown outwardly to bring the matrix into engagement with the blank.- I have also shown in Fig. 3 a port 15 arranged inthe barrel to provide a vent for releasing the air at that point when the projectile is thrown outwardly in the barrel, so that the air pressure is substantially off of the projectile at the time of momentum of the projectile, rather than air pressure at the moment of impact.

The method of forming the blanks and the operation of the apparatus as illustrated may be briefly described as follows: Assuming that the proper matrix has been applied to the projectile or matrix carrier 24 which is arranged in the barrel l5, and there is air pressure in the reservoir 35 with the valve 29 closed and a blank I arranged in the blank carrier 51, as shown in Fig. 1: 'The pedal lever is depressed. As rods 4'! and 46 are moved downwardly, the arm 45 moves downwardly (see Fig. 1) and this carries the end of the spring 44 secured thereto downwardly. At the same time the locking rod moves upwardly to engage in the opening or hole 59 in the plate 58. When the arm 45 has been moved downwardly suflicient to cause the spring 44 to'pass the valve stem 39, as it passes the dead center the arm 40 is immediately snapped down under the pull of the spring 44, turning the valve 29 and admitting air to the barrel l5 under high pressure. The pressure on the projectile 24 causes the same to travel outwardly the barrel at a high velocity, carrying with it the matrix 3 and striking the blank I. As soon as the projectile passes the port 15 the air pressure'below the projectile is relieved, but the momentum of the projectile causes it to strike the blank with the matrix, forming the character or design on the end of the blank. The striking of the blank by the matrix at high velocity with the light projectile does not deform the blank in the manner the dropping of a heavy weight on the blank would distort the body of the blank, nor in the same manner that repeated blows would distort the body of the blank. To the contrary, the body of the blank generally is not particularly distorted, but the imprint of the matrix is sharply defined on the blank and appears clean-cut. The pressure on the pedal being released, obviously, by means of the spring 53, the valve isclosed, and in the construction illustrated the interior of the barrel is then open to suction through port 33 and the valve ports 3i which communicate with the suction line 31 or to the atmosphere, so that the projectile drops back to the position shown in Fig. 3. Without impact, the blow being brought about by the 7 the suction, however, gravity would tend to draw it back, as the weight of the projectile, although light, would be sufficient to cause it to return to the. closed end of the barrel.

After the blank has been formed into a stamp I, as shown in Fig. 6, the stamp may be removed from the holder 57 and suitably heat-treated to harden the same. I have found that by employing this light weight projectile and impelling it at high velocity, there is no tendency to fold over the material in the blank Or to so affect the structure of the blank material as to weaken the same.

In Fig. 81 have illustrated a modifiedform of projectile. In the form shown in Fig. 5 the projectile or matrix or matrix carrier is made cylindrical to fit in a cylindrically bored barrel. 0bviously, the barrel may be square or of an irregular cross section so that the projectile will not tend to rotate or turn in the barrel. Fig. 8 shows a square projectile 1| provided with the matrix 10 formed as a part of the projectile. Various other modifications may be made in the projectile or carrier, the matrix or the barrel.

Having thus described my invention, itis obvious that various immaterial modifications may be made in the same without departing from the spirit of my invention; hence I do not wish to be understood as limiting myself to the exact form, construction, arrangement and combination of parts herein shown and described, or uses mentioned.

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

1. In an apparatus for forming steel stamps or the like, a frame, a tubular barrel arranged thereon, said barrel open at one end and closed at the other, said barrel provided with a fluid inlet adjacent the closed end, means for supplying a fluid under high pressure through the said port, a valve for controlling the admission of fluid to the port, actuating means for controlling the valve, a projectile arranged in the barrel between said port and the open end thereof, said projectile provided With a design at the outer end thereof, a stamp blank holder mounted on said frame adjacent the outer end of the barrel for rigidly holding a face of the stamp blank in proximity to the open end of the barrel in the path of the projectile, and means cooperating with said Valve actuating means for locking the said holder in operative position.

2. In a stamp forming machine of the kind described, a frame provided with a tubular barrel open at one end and a relief vent spaced back from the end and provided with an inlet port at the other end, means for supplying a fluid under pressure through said port, a valve for controlling the admission of fluid through the port to the interior of the barrel, valve actuating mechanism including resilient means for controlling the valve and to snap the same open and shut as desired, a projectile arranged Within the barrel between the ends thereof and movable from the closed end of the barrel toward the opposite end thereof, said projectile provided on its outer end with a suitable design corresponding to a negative of a design to be formed on a stamp blank, and a stamp blank holder arranged in proximity to the outer open end of the barrel for rigidly holding the stamp blank in the path of the projectile and presenting a face upon which the design is to be formed.

HELGE S. JONSSON.

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