US928256A - Die. - Google Patents

Description

W. H. GRISSOM.

DIE.

APPLICATION FILED NOV. 29, 1907.

Patented July 20, 1909.

WILLIAM neRIssoM, oF NEW YORK, N. Y.

DIE.

specification of Leamratent.

Patented July 20, 1909.

Application filed November 29, 1907. Serial No. 404,254.

To all when?. 'it may concern: i

Be it known that I, WILLIAM I-I. GRIssoM, a citizen ol' the United States, residing in the borough ol Manhattan, city, county, and State ol' New York, have invented certain newand useful lm n'ovements in Dies, of' which the following 1s a specification.

My invention has l'orits object an improved die adapted particularly to cutting mica-washers and the like. In the drawings which show one ol' the forms which my improved die may take, Figure 1 is a mid-vertical section partlylin elevation through devices within my invention; Fig. 2 is the same as Fig.V 1, except I that the section is taken through a vertical planeet right-angles'to that in Fig. l; and hg. 3 is a plan view as' seen from the line 3 3 in Fig. 1 looking inthe direction of the arrow with the up er right-hand portion of' the parts in Fig. 1 roken away.

Describing now my improvements with particular reference to the .devices of the drawings and reserving it to the claims to pointlout the novel features, the devices shown comprise broadly speaking two sets of parts, the upper set adaptedl to be mov- -able with the head of' the machine and the lower stationar on the bed-plate. The head and bedate or related parts of' the machine have been omitted as constituting no part of' the resent invention.

. In the first p ace describing what has been referred to, in view ol' the drawings, as the upper set of parts, these com )rise a hollow stem 1 adapted to be clampe or otherwise secured in any preferred manner to the head of the machine. Ordinarily saidstem will be so secured with its axisjvertical. In the form of' stem shown it is flanged outwardly at the bottom and said flange has a downwardly projecting internally screw-threaded rim 2. Screw-threaded into this rim is a cylindrical member 3 hereinafter referred to as the upper-die, the periphery 4 ol' its bottom opening being a cutting edge. It will be noted that the upper-die shown has a seat 5 in its interior upon which rests or coacts the flange of' a member 6, hereinafter spoken of as the rejector protecting-plate or -meml ber, which member below its flange has a portion of" less diameter adapted to be re ceived within the bottom opening through the upper-die. The .rejector protecting- Vplate is provided with a vertical hole through which the punch 7 next to be described can tion, the erlphery ol' whose 'free end has a cutting e( ge which may be about flush with the bottom o1' the upper-die. The upper portion ol' the punch is adapted to be received into the hollow axis ol' the stein 1 and has an enlargement or shoulder 8 adapted to fit a corresponding recess in the stein. and thereby l'orm a stop preventing the punch from being l'orced upwardly l'roiu below out of' the stem'. The punch. is adapted to be fiXedly secured to the siem by a setscrew 9 projecting through the wall ol' the stein and contacting-with the periphery ol' the enlarged-or shouldcr-portion ol'the punch. Surrounding the punch 7 within the upper die 3 and located between the stein 1 and the rejectorplate 6 is a thick-walled rubber- `tube 10, hereinafter spoken ol' as the re-` jector.

Describing now the lower set of parts, namely, those'which ordinarily will be located stationarily on the bed-plate ol' the niachine, these comprise a die-base 11 which may take the rectangular plate-forni shown. This die-base may be secured in any well known manner to the bed-plate ol' thc inaehine preferably so as to be adjustable in two directions' under the upper set of parts already described. The dic-base has a central vertical opening larger at the top than at tho bottom to provide a seat l2 upon which the flange of the lower-die member 14 can rest.v

This lower-die 14 has its body portion located within the vertical opening through the diebase and is secured in fixed position therein by bringing up on the set-screws 15 which project through the die-base from opposite ends thereof. The lower-die 14 is provided with a central vertical opening' 1,6 through it which preferably widens at its bottom as shown and'has at its top a cutting periphery adapted to shear with the punch 7, the latter telescoping within it. Mounted to be capable of reciprocating motion to and lroln the die-base is a stripper-plato 17 having an opening through which to receive the upper or cutting portion of the lower-die and counected with the die-base by lour bolts 1S in the'device shown.` The ends o1' these bolts screw through from below into the strippen plate, whereas their Shanks near their heads have sliding fitting with vertical openings through the die-hase, said openings being too smallto permit the heads of the bolts to pass. Surrounding these bolts between the diebase and the stripper-plate are spiral springs 19. The result of the construction is that the stripper-plate can be pressed downwardly toward the die-base and so move below the top of the lower die but when released will normally seek its former elevated position. To give uniformit and certainty to the elevation of the stripper-plate so that it will surely return to its original position instead of to some position short thereof, I provide a rubber ring 20 interposed between the diebase and the stripper-plate.

The operation of the described devices will now be understood. In Fig. 1, the devices are shown positioned as they will be when the upper set of parts is elevated. A piece of mica 21 having been inserted, the downward stroke of the die-head cuts the` washer com lete and in doing so positions the parts as s iown in Fig. 2, the mica washer being shown in section at 22. j

It will be noted from Fig. 2 that the reector protecting-plate 6 has 'been forced ack above its normal position, which is about-flush with the cutting edges of the upper-die and punch, and that its place has been taken up by the washer 22 which has just been cut and the top of the lower-die. The rejector protecting-plate in thus being forced to recede has strongly compressed the rubber re ector 10. Similarl the stripperplate 17 lias been forced be ow its normal position which is with itstop about flush with the cutting-ed es ofthe lower die and in so doing has strongIy compressed the rubber and springs located between it and the diebase. The washer having been thus formed complete by the Adownward stroke of the die-head, its upward stroke permits the release of all of the parts into the position shown in Fig. 1 under the restorative action of the rejector devices above and below. The result is that the washer is pressed downward and the stock upward into the original plane which they occupied when fed into the machine at Fig.` 1. In most cases the washer is placed back into the very hole in the stock out of which it was cut. The center blank out of the washer falls through the opening in the lower-die.

I have found that to make the rejector invariably reject all washers irrespectlve of the thickness of the stock, it must have considerable initial compression which is another way of saying that the piece of'rubber comprising the rejector must have a length considerably longer than the vertical clearance in the die. This means that if a die were to be used without the plate 6 but using a length of rubber within the die sufficient to reject thick mica, it would necessarily project so far below the cutting edge of the-die that it would make the device ractically inoperative and would be forced) between the cutting edges and soon destroyed. Therefore it is seen that the protecting-plate 6 has in addition to its function of protecting the lower-end of the rubber rejector from cutting, the even more important function of permitting the rejector to be put under an initial com iression sufficient to make it reject all thicknesses of washers, and which initial compression is such that it is impracticable or at least prohibitive to obtain it by merely permitting the rubber to project without using any late 6. Therefore 'the vital importance of t e plate 6 in connection with the rubber rejector will be better appreciated.

The devices have been s ecially designed' to make same readily adjustable to cut washers of various inside and outside diameters by a simple change of cutting tools. Thus, to vary the size of the hole in the washer it is only necessary to unscrcw the upper-die 3, loosen the set-screws 9 and remove the inner punch 7 and then to replace it by a punch of larger or smaller cutting diameter, of which there may be a set for use in connection with each machine. Of course as the upper punch 7 is changed it will be necessary to correspondingly change the lower-die 12 which is effected in an equally simple manner by removing the strlpperpla'te 17, loosening u on the set-screws 15 and removing and re acing the lower-die 14. Similarly the upper-die 3 can be replaced by others in obvious manner. The same feature of interchangeability in the devices shown will of course be found equally advantageous when replacing worn tools with new ones of the same size.

The rubber 20 and not the springs 18 1s depended upon for the rejector action of the .str1 per-plate 17, the purpose of the springs 1.8 eing rather to prevent one corner of the plate from lagging behind the others in its motion to and from the die base. In other words, the springs 18 make the stripperplate move morelevenly and with less friction than it would in their absence.

Having thus described my invention, what I claim is:

1. In a mica-punching device, the combination of a hollow stem; a punch adapted to be supported in the hollow of the stem and having a shoulder received against a seat therein and adapted to be secured fixedly in such position by a set-screw through the wall of the stem; a die comprising a hollow member screw-connecting with the stem to receive the punch through its interior with the .cutting edge of the latter separated by an annular space from the cutting edge of thedie;

a plate supported loosely in said annular space; a rubber tube about the punch within the die and bearing on said plate; and means adapted to shear with said punch and die.

2. In a mica-punching device, the combination of a die-base having a vertical opening ing an opening through which projects the Y cutting edge of the die; resilient rubber located between the die-base and the stripper'n plate; and means adapted to shear with said die. y

3. In a mica-punching device, the combination of a hollow stem; a punch adapted to be supported in the hollow of the stem and having a shoulder received against a seat therein; means adapted to secure the punch in position in the hollow stem a die comprising a hollow member screwconnecting with the stem to receive the punch through its interior with the cutting edge of the latter separated by an annular space from the cutting edge of the die; a plate supported loosely in said annular space; a rubber tube about the punch within the die and bearing on said plate; and means adapted to shear with said punch and die.

4. In a mica-punching device, the combination of a die-base, having a vertical opening through it with an upward-facing scat; a die adapted to be received Within said opening and having a flange resting on said seat;

means adapted to securethe die within the opening in the die-base g a stripper-plate connecting with the die-base to be capable of motion to and from it and having an opening through which pro'ects the cutting edge of the die; resilient. ru ber located between the die-base and the stripper-plate; and means adapted to shear with said die.

5. In a mica-punching device, the combination of a die, a co-acting punch and a rejector comprising resilient rubber located to be put under compression Aby the punching loperation, and plate-protected from being sheared, the rejector operating on the stock through its platesprotection.

In Witness whereof, I have signed my name to the foregoing specification in the presence of two subscribing Witnesses.

WILLIAM H. GRISSOM.

Witnesses:

E. W. Sonnen, Jr., T. W. SPRINGMEYER.

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