US1997292A

US1997292A - Punch press

Info

Publication number: US1997292A
Authority: US
Inventors: Vitus A Boker
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-07-22
Filing date: 1933-07-22
Publication date: 1935-04-09
Anticipated expiration: 1952-04-09

Description

A ril 9, 1935. v. A. BOKER 1,997,292

PUNCH- PRESS Filed July 22, 1935 2 Sheets-Sheet 1 t a n Fiji-Iva April 1935. v. A. BOKER 1,997,292

PUNCH PRESS Filed July 22, 1935 2 Sheets-Sheet 2 m 1mm m r 41. 3o 4 29 43 45 Wfm v 40 the die plateremoved therefrom;

Patented Apr. 9, 1935 V i i I 7 UNITED STATES PATENT OFFICE g PUNCH'PRESS Vitus A. Boker, Minneapolis, Minn. Application July 22,1933, Serial No. 681,727

fiClaims. (01.164-110) My present invention relates to punch presses, movements in vertical guides I? of said frame; and provides certain highly important improve-, and the numeral l8,'the connecting rod that ments therein, to wit: an improved self-stripconnects the eccentric of the crank shaft 15 to ping die set; and an improved means for sup said ram IS. The bedplate I4 is provided with 5 porting die plates, all as will hereinafter more one or more suitable slug passages l9, which, in '5- fully appear. the particulararrangement illustrated in Fig; 2,

Generally stated, the invention consists of the is divided into two channels by a partition 20, novel devices, combinations of devices and arwhich latter feature, however, constitutes no rangement of parts hereinafter. described and part of the present invention. v

.defined in the claims. r v Rigidly seeuredon the bedplate M, by means of 10 The invention is here illustrated in connection machine screws 2| or the like, is a die plate supwith a' punch press of standard construction of porting shoe 22 that spans theopening ISand is the type wherein movement of the power-acprovided withaslugpassage oropening'23 that tuated ram is controlled by a foot treadle, but the will permit the dropping a of slugs through .the

invention, of course, may be applied to any suit-. openings |9.- The shoe 22 has a raised portion 15 able type of press. that. is formed with longitudinal dove tailed Referring to thedrawings, wherein like charchannel that receives and slidably holds one or acters indicate like parts throughout the several more supplemental die supports in the form of views: H v V I a rectangular. metallic blocks 24 having projecting Fig. 1 is. a perspective showing the press studs or knobs 25. These blocks 24 slide fric- 20 equipped in accordance with my invention; tionally in the channel of theshoe and when Fig. 2 is a fragmentary view on a larger scale properly positioned, are adapted to be rigidly than Fig. 1, showing partly in front elevation and held'where set by set screws 26 applied through partly in section the principal parts of the press, .the'proper threaded perforations 26 of the shoe,

to wit; the rain, the punch holder, punch pad, as best shown in Figs. ,7, 8 and 9. The important 25 stripper plate, die plate, shoe and'bed of the purposeof these supplemental diesupports will press; q appear in the description of the operation and Fig. 3 is a View corresponding tolFigy2, but use of the invention. a j with different positions of the parts and with the The die, which usually is in theform of a flat shoe, dieplate and bed omitted; tempered steel plate 21, is rigidly secured on the 30 Fig. 4 is a horizontal sectiontaken on the .line top of the shoe by meansof screws 28 or the like 44 of Fig.3; r f A andspans thechannel of the shoe. This die plate Fig. 5 is a perspective showing the punch is shown as provided with die

openings

29 and 30 holder and stripper plate removed from theram; with a stock guide3 l; and a stop pin 32, ,but, of 4 Fig. 6 is a fragmentary section taken on the course, saidplatemay take different. forms, as '35 line 66 of Fig. 5.; v required "for punching out work of different Fig. 7 isaperspective showing'the shoeof designs. f the press'with the die plate applied thereto; The vertically movable ramlB above noted, at

Fig. 8 is a perspective showing the shoe with its lower end, has an axial bore adapting it to Y receive the tubular shank 33 of a punch holder Fig. 9 is a section taken on the line !l9v of or head 34. To firmly clamp the shank. 33, said Fig. 8; j H i ram at its lower endis split and provided with Fig.- 10 is a transverse section illustrating a a clamping segment lfi clamped-thereto by nutmodified form of the shoe; equipped studs IB as best shown in Fig. 4.

Fig. 11 is atransverse section illustrating a Above the clamp l 6, the ram is formed with dia- 45 shoe with modified form of die plate support; metrically, offset vertically extended slots 35 and 2 through which is extended "a knock-out bar 36 Fig. '12 is apersp'ective showing thedie plate that is capable of limited vertical movements in of Fig. 11' removed from the shoe. said slot, but is held'against endwise displace- The preferred structure illustrated in Figs. 1 "ment by suitable devices such as splitkeys or 50 to 9, inclusive, will first be described. Of the cutters 31, see particularly Figs, 2 and 3. The principal parts of the press illustrated, the punchholder 34 is formed with atransverse 1on5 numeral 13 indicates the framework; the nugitudinal slot 38 through which is extended a meral 14, the bedplate; l5, thepower-driven stripper bar 39 that is capable of limited ver- 1' ,5i crank shaft; l6, the ram mounted for vertical tical movements insaid slot. The

numeral

43 and 44 may be anchored inthe punch pad in various different ways, but preferably they are so anchored by casting matrix metal or the like,

(which does not perceptibly expand or contract under varying temperatureh, indicated; at, 45,,

around the same with heads or upper ends of said punches seated directly against said punch pad. Of course, the particular arrangement: of; the

punches in the punch pad and of the die pas-- sages in the die plate Will vary according to the designof the article to be punched.

The stripper plate 46, which is immediately belowthe punch pad, has punch passages that correspond to and freely pass the

punches

43 and 44. Loosely surrounding andv vertically movable on the punch holder or head 34, is a stripper frame 4"! through which the ends of the stripper bar 39 projects so that said bar andstripper frame will partakeof common vertical movenients. This stripper frame 41' is normally locked to the stripper plate 46 by suitablemeans such as spring-pressed latches 48 shown as pivoted'to the projecting end of stripper bar 39 and provided at their depending ends with hooked lugs that engage and interlock with seats on the end of the stripper plate, formed by brackets 43secured; to said; stripper plate at the ends thereof,

that project beyond the stripper frame,- see particularly Figs. 2, 3 and '5.

p When the ram andparts carried thereby are raised, as shownin Fig. 3, the projectingends of the knock-out bar 36 will engage thelower ends of stops afforded bylstop screws 51}, mounted for vertical adjustments in lugs 5 l onthe Ver- ,tical guides 11". Fromthe foregoing, it is evident that the punch pad with its punches m-ay be readily removed from the punchhol'derand other punch pads with punches properlyarranged for co-operation witha substituted die plate. may be applied to said punch holder. To effect such substitutions requires that thestripper plate be removed; and this obviously may be very quickly accomplished'by releasing the spring latches 48. In making the above substitutions and-at certain other times, it is desirable to hold the-stripper frame 41 in a raised position, and sometimes this may be desirable even when'the" stripper plate is; left in operative position; and this may be accomplished by inserting a lock pin 52'" in

coincident holes

53 and 54 formed respectively,

in the punch holder and stripper frame, see particularly Figs. 5.and 6.

. The sheet of metal from which the articles are to be. punched, and which is herein designated as the stock or stock sheet, is indicated by the character y.

' Operation in setting the punching apparatus for use, the

auxiliary diesupporting blocks 2 lwill be adjust- "ed so that their studs or projections will be engaged with the under side of the die'pl ateiat various weak points, such as points between die openings or punch passages. A good adjustment Rigidly seated in oozzez of said auxiliary die-supports is illustrated in Fig. 2.

When the ram is raised, the stripper plate, stripper frame, stripper bar, knock-out pin and knock-out bar will, under the action of gravity, tend to assume lowered positions in which the lower surface of the stripper plate will be slightly below the lowerends of the punches. Under the punching action, the stripper plate will come into contact with the stock strip or sheet, slightly in. advance of the punches, and will be gravityheld against the sheet while the punches are positively forced through the sheet. Under upward movement of the ram, the stock sheet will be frictionally held on the punches and carried upward therewith until the knock-out bar 36 comes into engagement with the stop screw 50, and thereupon, under the slightly continued up- 7 ward movement of the ram, punch holder, punch In Fig. l0,there is illustrated a scheme for fpositivelypreventing lateral spring or spreading of wide shoes. In this structure, the wide shoe is indicated by-55, transversely through the sides of which is extended one ormore nut-equipped bolts 58; In this arrangement, the auxiliary die-supporting block 5'! .is provided with a plurality of die-engaging studs or projections 58.

Fig. 11 illustrates a modified form of auxiliary die support wherein the die-supporting blocks 59 are providedwith hubs seated in the sides of the shoe Stand held in position by machine screw 6!. The form of auxiliary die support illustrated in Fig. 111 is especially designed to support inwardly projected lug-like portions of a die plate, such as best shown in Fig. 12 and also in Fig. 11. This die plate'62, it will benoted, is formed with inwardly projecting lug-like portions 63 that are adapted to be supported by underlying locks 59.

From the foregoing, it will be understood that thefdev ices above described are capable of various modifications within the scopeof the invention herein disclosed and claimed. The practicability and efliciency of the devices herein disclosed and claimed, as well as the cheapness of manufacture','h'ave been demonstrated in actualpractice. A further advantage in making thedies under this system may be'found to be a great saving of space in storing.

-WhatIclaimisi.

. .1. .In a punchpress, the combination with the I reciprocatory ram thereof and a punch-equipped holder carried by said ram, of a stripper frame having limited sliding movements on, said punch holder, a stripper plate detachably attached to said stripper frame and having openings through which the punches work, and means operative under receding movement of said ram to intercept- 'receding movement of said stripper frame and thereby cause said stripper-plate to strip the punched stock from the punches.

' 2. The structuredefined in claim 1 in further combination with latches for quickly attaching said stripper-plate to and; quickly" disconnecting the same from said stripper frame.

3. In a punch press, the combination with the reciprocating ram thereof and a punch-equipped holder carried by said ram, of a stripper frame having limited sliding movements on saidpunch -ho1der,j'a stripper bar extended through 'said punch holder and stripper frame and connected for movements with said frame, a stripper plate having openings through which said punches work, means on the outer ends of said stripper bar for connecting said stripper plate to said stripper frame, stop means relatively fixed on the punch frame, and knock-out elements intermediate-said stripper bar and stop means operative under receding movement of said ram to cause said stripper plate to strip the stock strip from the punches. r

4. In a punch press, the combination with the reciprocating ram thereof and a punch-equipped holder carried by said ram, of a stripper frame having limited sliding movements on said punch holder, a stripper bar extended through said punch holder and stripper frame and connected for movements with said frame, a stripper plate having openings through which said punches work, means on the outer endsof said stripper bar for connecting said stripper plate to said ram to cause said'stripper plate to strip the, stock sheet from the punches.

5. The structure. defined in claim 3 in which the means on'the outer ends of the stripper bar for connectingsaid stripper plate to the stripper frame are yieldingly heldlatchesr 6. In a punch press, the combination with the reciprocating ram thereof and a punch-equipped holder carried by said ram, of a stripper'frame having limited sliding movements on said punch holder, a stripper bar extended through said punchholder and stripper frame and connected for movements with said frame, a stripper plate -having. openings through which said punches work, means on the outer ends of said stripper bar for connecting said stripper plate to said stripper frame, a knock-out bar extended diametrically through and projected from said ram, a knock-out pin interposed between said knockout bar and stripper bar; and laterally spaced stop devices on the frame of said press adjacent saidram and against which the-projecting ends of said "knockout-bar are engageable under extreme receding movements of said ram to'cause said stripperplate to strip the stock sheet from the punches. Y c vrrus A. BOKER.