US2387027A - Interchangeable punch and die - Google Patents

Description

Oct. 16, 1945. A. c. JACKSON INTERCHANGEABLE PUNCH AND DIE Filed Aug. 15, 1944 3 Sheets-Sheet l Oct. 16, 1945. A. c. JACKSON INTERGHANGEABLE PUNCH AND DIE Filed Aug. 15, 1944 3 Sheets-Sheet 2 Oct. 16, 1945. A, c, JACKSON 2,387,027

INTERCHANGEABLE PUNCH AND DIE Filed Aug. 15, 1944 3 Sheet-Sheet 3 atente @et. i, was

INTERGE a Arthur C. Jackson, Swarthmore, Pa, assignor to L. V. Whistler, Kenmore, N. Y.

Application August 15, 1944, Serial No. 549,613

3 Claims.

This invention relates to sheet perforating presses; and more particularly to punch and die sets employed therein.

The object of the present invention is to provide mountings or adapters for the individual punches and dies respectively, which will be reversible, one for the other, in die and punch holders secured to the bed and the ram respectively of the press.

In most instances the perforating die is carried by the bed of the press and the perforating punch, which cooperates with the die, is carried by the movable head or ram of the press. The sheet to be perforated is between the die and the punch and rests on the upper face of the die, to be perforated by the punch when the ram descends.

The slugs successively remove from the sheets by the punch, are forced downwardly through a channel formed in the die, and are discharged from the press through a corresponding channel formed in the bed of the press. Suitable stops and guides are provided on the bed of the press for positioning the sheet in correct perforating position with respect to the die.

In some instances, it is desirable to reverse the above order, 1. e. to place the die in the vertical reciprocable ram and to hold the punch in a stationary position on the bed of the press, particularly in cases where a number of perforations P are to be made in the sheet in a given pattern, with each perforation in a definite relationship to each of the other perforations made in the sheet. In order to efiect correct positioning of the perforations, under these circumstances, the pattern for the perforations, particularly when a number of identical sheets are to beperforated, is layed out on a template which is superimposed on each sheet for marking the spots where the perforations are to be made in the sheet.

The template is provided with a number of small holes arranged in the relative positions where the perforations are to be made in the underlying sheet. These small holes act as indicators or guides for drilling corresponding pilot holes in the underlying sheet. The punches under such circumstances are provided with small axially projecting tits which, when the sheet to be perforated is placed in position on the upstanding ends of the punches, project into the pilot holes in the drilled sheet and hold the sheet against shifting in its own plane while the die descends into contact therewith.

The purpose of this invention is to mount the dies and the punches in such a manner that PUNCH AND his either of the two above-noted methods of locating the perforations in the sheet to be punched may be used. 1. e. the mountings, including the punch and die adapters, holders, etc., are so constructed and arranged as to afford readyreversibility of the respective punch and the die. adapters, and the sub-assemblages carried thereby, bodily in the punch and die holders rigidly secured to the bed and ram respectively of the press.

In the accompanying drawings:

Fig. 1 is a vertical sectional view of sufiiclent of a perforating press to illustrate the principles of the present invention as applied thereto, and wherein the punch is mounted on the bed and the die on the ram of the press;

Fig. 2 is a view similar to Fig. 1 showing the punch and die reversed in the press;

Fig. 3 is a view similar to Fig. 2 but showing a modification of the invention; and

Fig. 4 is a detail of the invention.

As shown in the drawings, the bed of a conventional perforating press is illustrated at I, and the vertically reciprocable ram of the press is illustrated at 2. As usual, the ram 2 is slidably mounted in guides 3, 3 secured to or forming part of the main frame of the press, not shown.

Mounted on the bed I is an adapter holder d,

and secured to the ram 2 is an adapter holder 5. The holders 4 and 5 are provided with identically shaped and dimensioned cavities 6a and 617 respectively. These cavities preferably include circular internal circumferential walls and flat bases, although the interior over-all configuration may be of any shape desired.

Mounted in the cavities 6a and 6b are the punch and die adapters 1a and lb respectively, each of which has the same identically shaped and dimensioned exterior configuration as the common internal configuration of the cavities 6a and 6b into which the adapters are adapted to fit snugly.

Each of the adapters la and lb is provided with a recess 8 at one or more points around its circumference, which are formed in the side wall of the adapter to receive a flat end of a securing screw 9 which is threaded into a corresponding hole drilled in the holder 4 or 5, as the case may be, whereby, by tightening the screw 9, the adapters will be held rigidly against axial and circumferential movement in the adapter holders 4 and 5 carried by the bed I and ram 2 respectively.

As shown in Fig. 1 the punch adapter In, which in this instance is mounted in the holder 4 carried by the bed i, is axially bored at l0, concentric to the peripheral circular wall ii of the adapter, to receive a diametrically enlarged base portion l2 of a punch i3. The base portion i2 01' the punch I3 is provided with a recess il in its side wall to receive one end of a locking screw it which is threaded into the adapter la at an angle with respect to the coinciding axes of the punch base l2 and adapter Ia, whereby the punch I3 is maintained in fixed relation to the adapter in.

The die adapter lb, which in this instance, is mounted in the holder 5 carried by the ram 2, is axially bored at l6, concentric to the peripheral circular wall I lb of the adapter lb, for the reception of the die block ii. The die block I! is provided with a recess ill in its side wall, which is adapted to receive one end a locking screw i8 threaded into the adapter lb atan angle to the coinciding axes of the die block i1, and adapter lb, whereby the die block ll is held in the adapter lb against axial or rotary movement with respect thereto.

The die block ll is axially bored at 20 for reception of and cooperation with a flat active end surface 2i of the punch [3, for forming perforations :1: in a sheet y initially placed between the punch and the die for that purpose. The slugs xi which are removed from the sheets 1; by the punch l3 in producing the perforations a: are forced upwardly into the bore 20 of the die block l! by the downward movement of the ram 2.

As the ram 2 reverses its direction of movement, the slugs ml are ejected from the bore 20 of the die block H, by an ejecting pin 22 which is slidably mounted in coaxially aligned bores 23 and 24 formed in the adapter lb and adapter holder 5 respectively. The upper end of the ejector pin 22 is engaged by an ejector bar 25 which is loosely mounted in a transverse slot 26 formed in the ram 2. The opposite ends of the bar 25 project beyond the opposite sides 21, 21 of the ram 2, to be engaged by adjustable abutments 28, 28 on the fixed ram guides 3, 3, said abutments in the present instance being in the form of screws mounted in fixed lugs 29, 29 carried by the guides 3, 3 or any other adjacently disposed fixed portion of the press.

The ejector pin 22 is shouldered, at 30, to bear against the base surface 3| of the adapter lb, to prevent said ejector pin from falling out of the ram- 2 after it has ejected a slug mi from the bore 20 of the die block l'l' as the ram rises.

The sheet 31 is stripped from the end of the punch l3 by a stripper plate 32 which is resiliently mounted on springs 33 carried by a base or plate ring 34 which is secured to the base i2 of the punch l3, said springs encircling rods 35, each of which has one of its ends secured in the stripper plate 32 and its opposite end slidably mounted in the ring 34 in the usual manner. A screw 36, having one end projecting into an annular groove 31 formed in the base l2 of the punch i3, retains the stripper assemblage in place with respect to the punch at all times.

When the punch I3 is used on the bed of the machine, as illustrated in Fig. 1, the end surface 2i of the punch l3, as previously noted, is provided with a pilot point or tit 33 which is adapted to project into a pilot hole yi formed in the sheet 11, for positioning the sheet 1/ with respect to the punch for forming the perforations a: in said sheet, as clearly shown in Fig. 4.

As shown in Fig. 2, the adapters la, and lb may be removed from the cavities or recesses la and 6b of the holders I and 5 respectively, together with the die block l1, and the punch II with its stripper assemblage 32-36, which are bodily carried on or supported by the adapters in and lb respectively, and the positions of the adapters etc. reversed, and for end, with the adapter la fitted into the recess 6b of the holder 5 and the adapter lb fitted into the recess 8a of the holder 1 4. The ejector pin 22 and the ejector bar 2|, under the above circumstances, are removed from the press. The bore 23 in the adapter lb is positioned over aligned slug channels 40 and ll formed in the bed i and holder 4 respectively. The tip 38 is removed from the punch i3 or an identical punch may be substituted therefor.

The successive vertical reciprocation of the ram 2, under the circumstances noted, causes the punch 13 to remove the slugs :ci from the sheet and force them downwardly through the bore 20 of the die block l1 and bore 23 of the adapter "lb to fall freely from the press through the slug channels ll and 40.

As shown in Fig. 3 the adapter holders 4a and a may be bored at 45 to one diameter, to receive and snugly embrace identically dimensioned flanges 4B, 46 formed on the die adapter 1c and punch adapter 1d respectively. The holders in and 5a. are counterbored, to a smaller diameter, and internally threaded, as indicated at 41, 41, to receive correspondingly externally threaded body portions 48, 48 of the adapters 1c and Id, for securing said adapters in said holders. Annular recesses 49 and 50 may be provided in said holders to give corner clearances for the adapters when screwed into the threaded recesses in the holders, whereby the base surfaces ii of the adapters will bear flatly and solidly against base surfaces 52 of the adapter receiving recesses 40 formed in the holders 4a and 5a respectively.

I claim:

1. -A punch and die set for use in a press having a pair of primary elements mounted for relative axial reciprocation for effecting a pressing operation between respectively opposed faces thereof, said set comprising a pair of holders adapted to be rigidly secured to said elements to extend beyond said faces respectively, a punch unit comprising a punch, an adapter for the punch, and means for securing the punch in its adapter, a die unit comprising a die, an adapter for the die, and means for securing the die in its adapter, said adapters being of identical shape and size cross-sectionally and said holders having adapter-receiving recesses of identical crosssectional shape and size with tolerance to receive said adapters selectively, said recesses being adapted to be axially aligned prior to securing said holders rigidly to said elements, said units completely assembled being adapted to be reversed in said holders without disturbing the rigid security of said holders in said elements by exchanging said adapters in said recesses.

2. A punch and die set for use in a press having a pair of primary elements mounted for relative axial reciprocation for effecting a pressing operation between respectively opposed faces thereof, said set comprising a pair of holders adapted to be rigidly secured to said elements to extend beyond said faces respectively, a punch unit comprising a punch, an adapter for the punch, and means for securing the punch in its adapter, a die unit comprising a die, an adapter for the die, and means for securing the die in its adapter, said adapters being of identical shape and size cross-sectionally and said holders having adapter-receiving recesses of identical crosssectional shape and size with tolerance to receive said adapters selectively, said recesses being adapted to be axially aligned prior to securing said holders rigidly to said elements, said units completely assembled being adapted to be reversed in said holders without disturbing the rigid security of said holders in said elements by exchanging said adapters in said recesses, and means for securing said adapters in said holder recesses.

3. A punch and die set for use in a press having a pair of primary elements mounted for relative axial reciprocation for efiecting a pressing operation between respectively opposed faces thereof, said set comprising a pair of holders adapted to be rigidly'secured to said elements to extend beyond said faces respectively, a punch unit comprising a punch, an adapter for the punch, and means for securing the punch in its adapter, a die unit comprising a die. an adapter for the die, and means for securing the die in its adapter, said adapters being of identical shape and size cross-sectionally and said holders having adapter-receiving recesses of identical crosssectional shape and size with tolerance to receive said adapters selectively, said recesses being adapted to be axially aligned prior to securing said holders rigidly to said elements, said units completely assembled being adapted to be reversed in said holders without disturbing the rigid security of said holders in said elements by exchanging said adapters in said recesses, said adapters and recesses respectively comprising external and internal walls including plain circular portions of predetermined diameter and screw threaded portions of relatively smaller diameter adapted to cooperate for accurately centering and rigidly securing said adapters interchangeably in said holders.

C. JACKSON.

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