US2678695A

US2678695A - Guide pin for guide plates of punching and/or perforating assembly

Info

Publication number: US2678695A
Application number: US185603A
Authority: US
Inventors: Paul H Taylor
Original assignee: WALES STRIPPIT CORP
Current assignee: WALES STRIPPIT CORP; WALES-STRIPPIT Corp
Priority date: 1950-09-19
Filing date: 1950-09-19
Publication date: 1954-05-18
Anticipated expiration: 1971-05-18

Description

M y 8, 1954 p. H. TAYLO 2,678,695

GUIDE PLATE GUIDE PIN FOR PUNCHING AND/OR PERFORATING A SE BLY Filed Sept. 19, 1950 4 Sheets-Sheet 1 Paul Taylor y 8, 1954 P. H. TAYLOR 2,678,695

GUIDE PIN FOR GUIDE PLATES OF PUNCHING AND/OR PERFORATING ASSEMBLY Filed Sept. 19, 1950 4 Sheets-Sheet 2 Paul H. Tayl r ATTORN EY May 18, 1954 P H TAYLOR 2,678,695

GUIDE PIN FOR GUiDE PLATES OF PUNCHING AND/OR PERFORATING ASSEMBLY 4 Sheets-Sheet 3 Filed Sept. 19, 1950 3mm PauZ H. Taylor ATTORNEY May 18, 1 4 P. H. TAYLOR 2,678,695

GUIDE PIN FOR GUIDE PLATES OF PUNCHING AND/OR PERFORATING ASSEMBLY Filed Sept. 19, 1950 4 Sheets-Sheet 4 awe/WM Paul HTaylor in M g 1 T uw mu N. QR T R i /0 V mu on I & MW Wm M R B m QM JV Q =7Z :74

ATTORN Ey ?atented May 18, 1954 GUIDE PIN FOR GUIDE PLATES OF PUNCH- ING AND/OR PERFORATING ASSElWBLY Paul H. Taylor, North Tonawanda, N. Y., assignor to Wales-Strippit Corporation, North Tonawanda, N. Y., a corporation of New York Application September 19, 1950, Serial No. 185,603

3 Claims.

This invention relates to apparatus of the kind employed in punching out and/or perforating blanks, or work-pieces, which may be in the form of plates, sheets, bars and the like, the invention being characterized by features which adapt it particularly, although not necessarily, to apparatus in the form of a self-contained, or unit, assembly which may be employed in connection with conventional presses.

The features which characterize the present invention are disclosed in my co-pending a plications Serial No. 185,601 and Serial No. 185,602 and may be employed to particular advantage in connection with the perforating apparatus and method disclosed and claimed in George F. Wales Patents Nos. 2,410,372 of October 29, 1946 and 2,419,862 of April 29, 1947, particularly the former.

Both of the patents referred to are concerned with perforating work-pieces by the use of transfer punches which, in the case of a multiplicity of holes, are driven into and lodged in the initial work-piece in the desired pattern. In subsequent repeat operations, the punches are driven out of one work-piece and driven into, and lodged in, another work-piece. Thus each work-piece in which the punches are lodged serves to hold the punches assembled in the desired relation until they are driven into and lodged in another workpiece, the punches being freed from the original work-piece in which they were lodged as this occurs.

Provision is made in each of the patents mentioned for aligning the punches with the cooperating die apertures when the work-piece in which the punches are lodged is placed in the desired relation with respect to a second work-piece to which the punches are to be transferred. In Patent 2,410,372, the means for aligning the punches and die apertures for the purpose contemplated comprises a guide plate. The latter is formed with guide apertures through which the punches may pass from one work-piece to the other and which are held in alignment with the die apertures by guide pins which connect the plate in which the die apertures are formed and the guide plate.

As noted, in each perforating operation, after the initial operation, the punches lodged in one work-piece are freed therefrom as they are driven through the guide apertures in the guide plate into a second work-piece to perforate the latter and become lodged therein. Prior to the succeeding operation, the work-piece from which the punches are freed and the guide plate are removed; a third work-piece is placed upon the die plate; the guide plate is placed in operative position upon the third work-piece; and the second work-piece in which the punches are lodged is arranged upon the guide plat with the punches carried thereby in alignment with the guide apertures in the guide plate. The operations described involve the separation of the guide plate from the die plate after each punching operation, the guide pins being necessarily withdrawn from the guide apertures which they occupy as this occurs. In order that the guide apertures in the guide plate will be held in accurate alignment with the die apertures in the die plate, it is essential that the guide pins have a snug fit in their guide apertures. As a result, the guide pins frequently stick in, or bind in, their guide apertures and in so doing mak it difficult to separate the guide plate from the die plate, increasing substantially the time and effort involved in effecting such separation.

The principal object of the present invention, therefore, is to overcome the above objection. This object contemplates a guide plate having guide pins associated therewith in such a manher that the punch and die elements will be accurately guided with respect to one another, the guide pins being so designed that they may be freely withdrawn from the guide apertures in which they are accommodated when it is desired to separate the guide plate from the particular element to which it may be connected by said pins.

A further object is a novel design and arrangement of the guide pins for the purpose described, whereby to provide for simplicity and economy in construction and facilitate manipulation of the guide plate in the manner required.

The invention is illustrated in the accompanying drawings, wherein;

Figure 1 is a perspective view of a blanking and perforating assembly which includes a guide plate having guide pins embodying the features of the invention, the assembly being shown in connection with stock material from which perforated work-pieces are to be produced and in operative relation with respect to the bed and ram of a press by which actuation of the parts of the assembly is to be effected;

Figure 2 is an enlarged section taken along line 2-2 of Figure l;

Figure 3 is an exploded view ShOWiIlg in perspective the parts of the blanking and perforating assembly;

Figure 4 is a sectional view similar to Figure 2,

but with the perforating punches omitted, and illustrates an embodiment of the invention wherein provision is made for preventing locking together of the parts of the apparatus when not held apart by a workpiece; and

Figure 5 is another embodiment of the invention wherein the parts of the apparatus are also specially designed to prevent locking together of the parts in the absence of a work-piece.

The features of the invention are illustrated in connection with a blanking and perforating assembly of the kind disclosed in my co-pending application Serial No. 185,601. The said assembly is indicated at l5 in Figure l and, as illustrated, is in the form of a multi-part unit, being shown supported upon a table it carried by the bed I? of a conventional press under the rain l8 of the press. One end of a strip of stock material I!) from which perforated work-pieces are to be punched is shown introduced between the parts of the blanking and perforating assembly.

As illustrated, the blanking and perforating assembly comprises a blanking die 20, a combined perforating die and blanking punch 2i and a guide plate 22, these parts being shown in perspective in exploded relation in Figure 3. In this connection, it will be noted that all of the parts shown are generally triangular in shape as the perforated work-pieces to be produced are of such shape. Obviously, square, round or otherwiseshaped work-pieces may be produced, it being understood that, although the shearing edges of the blankin die and blanking punch will conform to such shape, the overall, or outside shape of such blanking elements is not dictated by the shapes of the shearin edges.

The blanking die is formed, or provided, around its inner walls and at the bottom thereof with a shearing edge 2 which is preferably of a greater height than the thickness of the stock material 19, and hence of a greater height than the thickness of the work-piece to be punched from said material. The shearing edge 24 is of a shape which will produce work-pieces of the desired shape and is extended inwardly, as illustrated, to provide a clearance 25 above the shearing edge.

The combined perforating die and blanking punch 2! corresponds in outline to that of the shearing edge 24 of the blanking die. the side and top walls of the member 2| cooperating with the shearing edge 24 to punch work-pieces from the stock material. The member 2i is also formed with die apertures 28 with which perforating punches 2! (Figure 2) cooperate in perforating the work-piece in the manner described.

The guide plate 22 (Figure 3) has a marginal edge which is adapted to cooperate with the shearing edge 24 of the blanking die 23 so as to guide the latter in proper relation with respect to the perforating die and blanking punch 2| as the blanking members are operated to punch out the work-pieces. The guide plate 22 is also formed with perforations 28 which are adapted to guide the punches 27 in proper relation with respect to the die apertures 28 when the punches are operated to perforate the work-pieces.

In order to maintain the guide plate 22 in proper relation with respect to the perforating die and blankin punch 2|, the guide plate carries guide pins 29 and 39, these pins being adapted to enter guide apertures 3| and 32, respectively, in the perforating die and blanking punch 2|. When the guide pins 29 and 30 occupy the

guide apertures

31 and 32, the guide plate will be held against lateral displacement and maintained in such a position that the blanking die 28, when actuated, will be guided in the proper relation with respect to the shearing edges of the blanking punch 2| while the punches 2? will be guided in the proper relation with respect to the die apertures 26. In addition, the strip of stock material l9 will be accurately guided between the blanking die and blankin punch by the

guide pins

29 and 30.

Preferably, the lower end of the guide pin 29 is spherical, the major diameter of the sphere being located just below the upper surface of the perforating die and blanking punch when the parts are assembled in operative relation. The major diameter of the spherical end of the guide pin 29 is of substantially the same diameter as the guide aperture 3! while the shank of the guide pin is of substantially less diameter. The guide pin 30, on the other hand, is of substantially the same diameter as its guide aperture 32. However, its lower end is beveled, as indicated at 33, so that at the side of the aperture 32 away from the aperture 31 the full diameter of the pin 39 terminates just below the upper face of the perforating die and blanking punch 2!, as best shown in Figure 2. When they occupy their guide apertures, the guide pins are operative to hold and guide the cooperating punch and die elements accurately with respect to one another. The guide pin construction described has the advantage that in disassembling the parts, the guide plate may be rocked by lifting the end which carries the guide pin 30. When this is done, the spherical end of the guide pin 29 will pivot in the guide aperture 31 while the guide pin 30 readily moves out of the guide aperture 32. The beveled face 33 of the guide pin 30 enables the guide plate to be rocked in the manner described and compensates for the increased increment of length between the pins as the guide plate is rocked.

In accordance with the invention, the end of the stock material 19 is arranged upon the perforating die and blanking punch 21, as shown in Figure 2. The guide plate 22 is then placed upon the stock material so that the

guide pins

29 and 30 enter the guide apertures 3| and 32 in the perforating die and blanking punch 2|, it being understood that the width of the stock material 49 is less than the distance between the guide pins and that the path of movement of the stock material, as it is fed, is normal to a line between the guide pins. The blanking die 20 is then oriented and fitted over the guide plate so that it will also be supported upon the stock material; and the heads of the perforating punches 21 are inserted in the guide apertures 28 in the guide plate so that they rest upon the stock material.

With the parts assembled in the manner described and with the assembly positioned in a press, as illustrated, the ram of the press is actuated to lodge the blanking die on the marginal edge of the work-piece. At the same time, the blanking die is punching out the work-piece, the perforating punches are driven into, and lodged in the workpiece, thereby forming a perforation, or any desired pattern of perforations. Upon completion of the operation illustrated in Figure 2, the blanking die and perforating punches are lodged on and in the work-piece and these parts may be handled as a unit,

The ram of the press is then elevated. Thereupon the work-piece and the blanking die 20 are removed and the stock material is advanced to position a new section over the perforating die and blanking punch 2|. The guide Plate 22 is then again placed on top of the stock material with its guide pins 29 and 3!} entering the guide apertures 3i and 32 in the perforating and blanking die. The work-piece which has been punched out of the stock material in the manner described and which at this stage carries the blanking die and perforating punches is then placed upon the guide plate so that the shearing edge 24 of the blanking die overlies the upper marginal edge portions of the guide plate 22 and so that the heads of the perforating punches 21 enter the guide apertures 28 in the said plate.

When the parts have been arranged as described, the ram of the press is operated as before.

The blanking die is thereby freed from the original work-piece and punches out and becomes lodged on a second work-piece. At the same time, the heads of the perforating punches 2'! are driven out of the original work-piece and are driven into, and lodged in, the second work-piece. As the blanking die and perforating punches are moved to the positions described, the original work-piece moves into the clearance while only the reduced shank portions of the perforating punches 21 oocupy the perforations formed in the original workpiece by the heads of the perforating punches. The original work-piece and the guide plate 22 may, therefore, be readily removed so that the sequence of operation described may be repeated.

In the embodiments of the invention illustrated in Figures 1} and 5, provision is made for preventing the guide pins 29 and 33 from entering the guide apertures 3i and 32 in the perforating die and blanking punch 25 to such an extent as to cause locking together of the guide plate 22 and the element 2! when a work-piece is not present to hold these parts separated, as for example when the assemblies are stored or otherwise not in use.

As illustrated in Figure 4, the lower portions of guide apertures 3! and 32 are threaded to receive screws 59 and iii, respectively. The upper ends of the screws conform in shape to the lower of the guide elements 2s and .59, the upper end of the screw 5i being inclined at the same is as the lower end of the guide element 38 while the upper end of the screw 53 is formed with a shallow socket conforming in curvature to the spherical end of the guide element 29. The

5i, and 55 are, as shown, adjusted so that in the absence of a work-piece between the guide plate 22 and the perforating die and blanking punch 25, the guide plate will be supported in spaced relation with respect to the element 21,

th reby preventing the

guide elements

29 and 33 from entering the guide apertures 35 and 32 to such an extent as to cause the parts to become locked together in so doing render diificult separation of such parts incident to their subsequent use.

in Figure 5 the same objective is attained by the use or" rubber plugs 52 and 53 which are used in place of the screws 50 and Si illustrated in Figure 4. The plugs 52 and 53 have upper ends ich conform in shape to the lower ends of the de elements 29 and 36; and they are adjusted in. he

openings

32 and 32 so that in the absence a work-piece between the guide plate 22 and the perforating die and blanking punch 2!, the guide elements 29 and 36 will be prevented from entering the guide apertures 3i and 32 to such an extent as to cause locking together of the connected parts. The plugs 52 and 53 have the advantage that, being resilient in nature, they will yield when work-pieces slightly thinner than those for which the parts were originally adjusted are blanked out of the stock material.

It is to be understood that, although the guide pins have been illustrated in connection with apparatus for simultaneously blanking and perforating work-pieces, this is intended by way of example only as the features of the invention may also be employed to advantage with apparatus utilized solely for blanking or for perforating and with various forms of punching apparatus other than the specific embodiments illustrated.

I claim as my invention:

1. Guide means for use with a punch element and a cooperating die element that are adapted to be disposed between the ram and the bed of a press and that are adapted to have the sheet stock material which is to be punched disposed between them, one of said elements being removable to permit placing the stock material between said elements, said guide means comprising a plate for guiding one of said elements in operative relation with respect to the other, said plate having a guide surface cooperating with one of said elements, and a pair of spaced-apart guide pins carried by said plate, said pins being aligned transversely of said plate and being disposed, respectively, adjacent opposite sides of said plate, and being spaced apart a greater distance than the width of the stock material, one of said elements being formed with a pair of spaced, transversely-aligned, cylindrical guide apertures adjacent opposite sides thereof for accommodating said guide pins, and means for rockably mounting one of said guide pins in one of said apertures to permit withdrawal of said guide pins from said apertures and removal of the removable element.

2. Guide means for use with a punch element and a cooperating die element that are adapted to be disposed between the ram and the bed of a press and that are adapted to have the shaft stock material which is to b punched disposed between them, one of said elements being removable to permit placing the stock material between said elements, said guide means comprising a plate for guiding one of said elements in operative relation with respect to the other, said plate having a guide surface cooperating with one of said elements, and two spaced-apart guide pins carried by said plate, said pins being aligned transversely of said plate and being disposed, respectively, adjacent opposite sides of said plate and being spaced apart a greater distance than the width of the stock material, one of said elements being formed. with a pair of spaced, transversely-aligned cylindrical guide apertures adjacent opposite sides thereof for accommodating said pins, one of said guide pins having a spherical end to engage in one of said guide apertures and a reduced shank portion connected to said guide plate, and the other of said pins having substantially the same diameter as the other guide aperture and having a beveled end face which engages in the other of said guide apertures, said beveled face facing away from said spherical end, whereby to enable said guide plate to be rocked to facilitate withdrawal of said guide pins from said guide apertures.

3. Guide means for use with a female blanking die and a cooperating male blanking punch that are adapted to be disposed between the ram and the bed of a press and that are adapted to have the sheet stock material which is to be blanked 7: dispgsedibetweemthemsaidiblanking diehavingn a shearingz edge. at; one endiandadie-cavity,hav: ing an:axialimextending-;margina1.-wa11 adjoin:- ing said shearing-v-Bdge, and'said blanking punch having twoi-rspaced, transversely-aligned guide apertures therei-niadiaoent its.opposite sides; respectively, said;guide.meansqcomprising a guide plate having asperipheralw guidessurface cooperating with. said marginal wall, ,and two spaced, transversely alignedguide pins secured to said p1ate,-- saidpins :being ;spaced=further apart than the .widthmf said stockamaterial and being ;disp0sed;- respectively adjacent.v opposite sides of said plate to be accommodated in said guide 8 apentures anduneans; fonrrockably mountingmnen of. said guide. pinsiimone of-saidiapertures $043.22- cilitate -.w-ithdrawa1:of-,both .iof isaid =guide ;pins:: from said :apertures:

References. Cited th'e fil'd of. this .patent i UNLTED STAEIESZ-PAIENTS:

Number Name--= Date 2,379,271" Bechtel-' June-26;"1945' FOREIGN PATENTS.

Number Country 1 Date 302,851;v Gneat filtitaimamwu Dem-27:; 19282?