US2369064A - Press for drawing blanks - Google Patents

Description

Feb. 6, 1945.

F. H. MALONEY PRESS FOR DRAWING BLANKS Filed March 10, 1942' 6 Sheets-Sheet l BY- @WQ AT TORNEYS Feb. 6, 1945. 1 F. H. MALONEY 2,369,054

I PYRESS FOP. DRAWING BLANKS Filed March 10, 1942 e Sheets-Sheet 2 INVENTOR.

Fran/r H. Ma/oney A'T TOR NE Y5 Feb. 6, 1945. F. H. MALONEY 2,369,064

PRESS FOR 'DRAWING BLANKS Fild March 10, 1942 6 Sheets-Sheet 3 INVENTOR. Frank H Ma/one y AT TORNEYS Feb. 6, 1945. F. H. MALONEY I 2,369,064

PRESS FOR DRAWING BLANKS Filed March 10, 1942 6 Sheets-Sheet 4 BY MQ Z44Z AT TORNE Y5 Feb. 6,' 1945. F. H. MALONEY PRESS FOR DRAWING BLANKS Filed March 10, 1942 6 Sheets-Sheet 5 INVENTOR. Fran/r hf Ma/one y MQ NR ATTORNEYS Feb. 6, 1945. MALQNEY PRESS FOR DRAWING BLANKS Filed March 10, 1942 6 Sheets-Sheet 6 INVENTOR. Fran/r H Mala/76y BY M9 M ATTQRNE Y5 Patented Feb. 6, 1945 PRESS FOR DRAWING BLANKS Frank H. Maloney, Elmhurst, Long Island, N. Y., assignor. to Brass Goods Manufacturing 00.,

Brooklyn, N. Y., a'corporation of New York Application March 10, 1942, Serial No. 434,040 7 15 Claims. (Cl.113-..-113) This invention relates to a drawing press for drawing thin metal blanks; which have been previously blankedout from thin sheet metal,

into cups which are intended later to be further drawn into the shape of bullet packets. In the past there has been difficulty in feeding such thin metal blanks from a magazine in which the blanks are stored in stack form to adrawing die.

Theblanks usually do not come from the blankin'g press perfectly flat, but the major portion of them are somewhat curved so that 'they are presented to the feeding mechanism at the mouth of the'stack in different planes, the' peripheral edge of a blank which is presented with its convex surface downwardly being somewhat higher than the peripheral edge of a perfectly flat blank.

This presentation of the blanks at the mouth. of the stack in different planes du'eto their curvature causes an irregular feedingof the blanks, and often causes the feeding mechanism at'the mouth of the stack to become jammed so that feeding of the blanks is interrupted.

vIt is a principal object of the present invention to overcome this difilculty by removing the lowermost blank from the stack and separating it from theremaining blanks therein by transporting it individually sidewise into a guide member 'which is in alignment with the drawing die, and then transporting the blank individually alon'g'such guide member'to the die, the guide member, be-

ing designed to constrain the blank during its" motion and deliver it, in proper position to the die.

It is an important feature of the invention that all the blanksirrespective of whether they are flat or slightly curved, are presented at such guide member with their peripheral edges at the same level or in the same plane, so that they may be pushed along a hollow guidew'ay provided in such guide member by means of athin' push finger which is reciprocated there-in andse'rves to deliverthem individually to the drawing die. This object is secured by removing the blanks individually from the bottom of the stack by means of a reciprocable slide member which is provided with a recess into which thebottom portio'ns of such blanks may extend which happen to be nonplanar;'and are presented at the bottom of the stack with their convex surfaces down. This recess is so designed that blanks presented at the bottom of the stack, which are flat or are dis- Where a multiple unit press is utilized having,

for exa'mple, three forming dies provided with ing' structure; 4 5

'bers. This single slide member is provided with three different recesses'of the type heretofore described for receiving the blanks and advancing them into the aforementioned guide members. Other objects of the invention-will become apparent as the description thereof proceeds.

For a better understanding of the invention reference is made to the following description taken in connection with the accompanying drawings, in which: I I

Fig. l is a fragmentary side viewof a multiple unit drawing press embodying the invention;

Fig. 2 is a fragmentary front view of the 'drawing press shownin Fig; 1; I

' Fig. 3 is a s'ectionalviewof the press of Fig. 1 taken on the section line 3-3 thereof in the direction of the ar'rows;

Figs. 4 and 5 are fragmentary sectional front views on an enlarged scale showing a portion of the feed means for withdrawing the blanks from v a magazine and advancing them'toward the drawing die;

Fig. 6 is a fragmentary top plan view showing a'reciprocable slide member of Fig. 4;

Fig. 7 is avertical sectional view showing on Fig. 11 is a fragmentary vertical sectional view showingoneof the punches and drawing diesof the press of Fig. 1 and. a portion of the means for feeding the blanks;

Fig. 12 is a top plan view of one of the drawing dieunits'partially separated from its cooperat- Fig. 13 is a "fragmentary vertical sectional view 6 taken on the line l3-l3 of Fig. 1 showing the construction of the guideway for guiding the blanks asythey are advanced. rearwardly toward the drawing die;

Fig. 14'is a top plan view showing one of the drawing dies" and its supporting ring; and

Fig. 1518 a vertical sectional view showing the 1 construction of the mouth of a magazine and a portion of the means for removing the blanks individually therefrom. f

Referring first toFigs. 1,2 and 3, the drawj ing press shown comprises'three drawing press units III, II and I2 which are similar and are mounted on a. common. horizontal supporting plate 13 which is in turn supported onthe maln "inFig. '2, the;.'several arms'3il are spaced apart on the shaft 32, which issupportedlfor ,free

blanks;

frame F of the press. This frame is carried by the usual supporting base B. Supported on the plate It] by means of spaced apart blocks all is an elongated horizontal plate [5 provided with a groove [6 in which is reciprocable a slide meme ber I l common to the three press units.

The slide H, see Figs. 4 and 6, has secured thereto adjacent each of the magazines l9 by l scr ews 4 1 -:a pusher plate i8Whi01'lBXt8HdS above A deems-a scription of the press unit [0 will now be given, w

it being understood that the construction of the Tat he level of the top of slide TIL! andabutting against the right hand end of the plate 48 is a blank supv porting plate 49 which is secured to the slide I1 .bya screw 50. The plate is recessed, as shown 1 at 51in Figs: 4, 6 and 7, the wall of the recess units H and I2 is exactly. similar and corre-p .l

sponding parts of the different units are-accordv ingly designated by the same-reference 'numer' als on the drawings.

The slide I! receives the blanks I which are I I to be formed into bullet'cups, from the mouth of a vertical magazine l9 and advances them individually tothe'frjightin'Fig. 3 and deposits ,ther'n' fin' front of afthin push rod 2i]. This rod transports tnem'rarWarmy and' delivers them one by one under 'a, vertically reciprocable punch 21 which" presses th'emthroug'h a'drawing die 2 Z, Fig} ll, to 'be 'later described and which draws or 'form'sthem into cups of the desired shape. fTIhe' slide 11 'is reciprocated' by means or a 23 whose other end is connected to an arm '24. which is secured to a shaft 25. 'This shaft isn-supported'in'twobearings 26 formed in a pair of brackets'Iftwhich "have portions extending-along "the top o'ffplate I 3 and are se the top; as indicated at 53. reaches its extreme position to the left, the bottom blank of the stack'is deposited on the blank being :cylindricainearthe bottom as indicated =at 52:an'd inclined outwardly and upwardly near As the slide 11 ing down for some distance along thelperip'heral cured thereto by the screws '28. The shaft p is in turn oscillated byvme'ans of a second arm ZQ secured, thereto and a drive link .30, the upper lend ofthe llink f3ll being driven, by means of a powerldriven cam or equivalent (not shown).

The means for reciprocating each push rod 211 comprises an arm :31 secured to a shaft 32,- the arm 3i atlits upper-end being provided'with an elongated slot 32 (Fig 'lg). adapted to receive a pin .33 projecting from: a depending lug 34 secured lt'orcthe 'fron'trend of push rod. l As shown c'illation 'in a pair of -bearing brackets 35 which are secured to the front face .of theplate l3 by 3rd and 4thblan'ks haveftheirconvex surfaces 4o the screws '36,.j'The shaft '32, is oscillated in timedrelation'w'ith theshaft' 25 by means ofan armlal secured t'ofthe end thereof and a drive llin'kf38 wjh'ose lower end is pivotally connected with arm-'37 and whose fupper endis reciprocated by means o'ffa p. .alentfinotJshowli), p 1

For a more detailed disclosure of the means whereby-the metal blanks [8 which have previouslyhbeien' blanked out in ..a blanking press, are removed individually from the mouth of the magazine l9 reference isjmade to Figs, 4 to 7.

and 15. vThe m agazir 1e,ll l.is shown as comprising a thin walled tube 39 whose lower end extends into a recess 40 provided ina ge'nerallyrectangular shaped plate .41 which J's-secured to 1 wer driven earner equiv- 5 figures is somewhat exaggerated for clearness. The diameter-of the blanks is slightly greater edge o'f'the second blank and thereby preventing tli'is blank from being advanced to the right along with the bottom blank of thestack.

It is found 'thatfthe' major portion of the blanks coming from certain blanking pressess arelno't perfectly flat but are som'ewha't curved. When such blaiiksare putinto a hopper and feed 'promiscuousljy to the .severalij magazines ID by anysu'i'table mean'sK'not shown); the 'bla'nks arrive at the bottom of a magazine disposed in different relative orders as shown in Figs. 4, 8,

9 and 10. "InFigf lf the two"bottom blanks and I the 5th andffith are shown disposed with their convex 'face's disposed j downwardly while the disposed upwardly. "In Fig. .8' the bottom f'blanks are both curved and have their convex surfaces disposed upwardly while in Fig. 9 'both the 'fb'lank's are curved, and the convex surface of the'bottom one is disposed upwardly and that of the, other'blankidownwardly. In"Fig. 1j0 the bottom f blank is curved with its convex surface-disposed downwardly, and "the other blank is .curved with its convex surface disposed, up-

Wardly. .The curvature of the blanks in these enter the 'recess jiil butgrests jongthe flat upper surface of 'the'plate 49. I, The result is that the peripheral; edge 58' "of each blank is disposed at the same "level" as it is deposited on "the plate the supportingplate l5 by one or, more screws 549 in position to here-moved. from the stack Z2v (Fig.,15'). Thefront of plate All is cut away: sloping first rearwardly. and downwardly to pro- 'vide the inclined face 43 and then downwardly tolprovide the vertical,face-44, 'a s shown in- Fig.

15. A companion-plate llijhas its .-rearsurface 'islhigh enough to clear/thebottom blank as it.

shaped tov fit against the faces. I33, and 44 and ip a s a e held-to ther o encompass h lower end of the stack of'blankSl-by a pair of screws 46. This construction permitsreadyaocess to the blanks 'atthe lower end ofthestack 7 irrespective of whether" the blank is perfectly 1 flat. or has its center portion curved upwardly or downwardly. It'wi'II also be observed from these figures thatthe upper Wall of 'theslot 5.6

leaves thevstack and'yet is low enough to engagethe peripheral) edge of the next higher "blank in the stack and thusjact as ajstopto regroove55. The vertical side wall59 'of thfe groove prevents the blank l8 from being carried too: far to the right due to its inertia as the slider" is stopped and starts to move in the opposite direction. The plates 4| and 45 are cut away on their under sides as shown in Figs. 3,4 and 13andrthe housing 54 is shaped to extend into suchcut-out as indicated at 60, thereby bringing the groove 55 into which the blank is advanced closer to the mouth of the magazine 9 and making the structure more compact. Referring to Figs. 1 and 2, the front portion of the'push rod 28 is supported on two elongated guide plates 6| along which it is slidable, these plates being secured to the bottom face of housing54. I

When the blank is in position in groove 55 it is engaged by the front end of push rod 20, see Fig. 11, which immediately advances it rearwardly and pushes it into a positioning ring 62 which causes the blank to be located andretained in proper position above the die 22. Die 22 in the illustrated embodiment of the invention has the shape shown in Fig.,11 and is adapted to draw the blank into the shape of the bullet cup 63 shown in dotted lines. It will be understood, however, that the invention is not limited to a press for drawing blanks into this particular shape as it is equally well adapted for a press for drawing blanks into many other shapes, according to the shape of the drawing die and blanks used.

The die 22 is seated in a recess formed in a die block 64, the upper surface of which is recessed to receive the blank positioning ring 62, this ring being secured to the die block by two pins .65. The generally cylindrical shaped die block 64 is seated in a counterbored recess 66- (Fig. 12) provided in the upper face of a supporting plate 6'! which is secured in position on the main supporting plate I3 by a pair of screws 68-59. The screw 69 passes into a threaded opening provided in a forwardly extendin'v portion 1| of plate 61, the extension 1| being of generally rectangular shape as shown in Fig. 12 and extending forwardly under the plate l5, as shown in Fig. 11. The plate I5 is also arcuately shaped at 12 to abut against the front portion of die block 64. Plate is also provided with a pair of aligned slots 13 adapted to slidably receive a pair of stripper slides 14 whose inner ends are shaped as shown in Fig. 11 and serve as stripper fingers to strip the cup 83 from the punch 2| after the latter has reached its lowest position and commences'moving upwardly on'its return stroke. The slides 14 are biased inwardly by means of the springs 16, each spring at its inner end bearing against a depending projection 11 formed on the slide. At its outer end each spring is seated in a notch I8 formed in a block 19, each such block being secured in position on the plate 67' by a pin 80 which enters a bore 8| provided in this plate. The motion of each slide 14 inwardly is limited by a downwardlmdepending lug .82 formed on the end of the slide and which strikes against the outer face of block 18. The die block 84 is clamped in position by means of a generally rectangular shaped clamping block 83 which is counterbored, as indicatedat 84, to receive the major of the peripheral wall of the die block. The clamping block 83 is secured to the plate 61 by means of a pair ofbolts 85 whose lower ends engage threaded holes 86 provided in plate 61 (only one being ,shown in Fig. 11);. These bolts also pass through a pair'of semicylindrical notches 81 provided in the edge of the his b c s e igs. 12 an la p n lock 83 isalso. bored to receive a-punch-guide bushing 88 through which the punch 2| passes. As shown in; Figs. 3 and 11, the rear end of housing 54 engages the-front face of clamping .block 83 and a, slot'89 is formed in the latter, which slot is in alignment with the slot 55 inhousing 54, the two slots-55-89 forming a straight. guideway which guides the blank all the time it, is being pushed rearwardly by the push rod 20 until shortly after itreaches the dotted.positionindicated at 90,, Fig; 11, and drops into the positioning ring 3 After'a cup-63 is formed,.it passesdownthrough a short-tube 9| set-in an opening. 92 formed plate 4 61,. through a second and larger opening 93 formedfinplate l3 and out through a large opening 94 of the shape shown in dotted lines in Fig. 3, in the main frame F.

- From an inspection of the structure described itwill be clear that a worn die may be readily removed 'forrepair or replacement by a new one byloosening'the bolts and removing the clamping block 83 whereupon the die block 64 may be readily'lifted out and taken to a bench where the. die 22 may be removed therefrom in an obvious manner.. After repair or replacement of the die it is only necessary to place the'die block and clamping block 83 in position on the press and again lock the parts in operating position by-tightening the bolts 85.

Referring to Figs. 1 and 2, the three punches 2| are all secured to a single operating head or rain 95 which operates in vertical guidew'ays' 96 provided in the main frame F. The operating headis driven in the usual mannerby any suitable'power driven operating means (not shown). In the operation of the press the bottom blank is. removed-from each of the magazines I9 as the slide I1 is advanced toward the right by the driving connections heretofore described. The

motion of the blanks toward the right continues until theslide reaches its extreme end position when the three blanks are disposed in the guideways 55, one blank in each. At this time the push rods 20-are moved rearwardly bythe arms 3| and operating connections previously described, these rods pushing thethree blanks off the slide H and advancing them along the guideways 55 and through the slots 89 in the clamping blocksfl83 (Fig. 11) until each blank falls into its positioning ring 62 and is disposed in proper position above its drawing die 22.- The operating head 95 then descends causing the punches 2| toengage the blanks and force them simultaneously through the drawing dies 22 which form the blanks into the shape of the desired cups. The stripping fingers 15 grip the upper edges of the cups as the punches commence to rise and strip'the cups from the plungers which are returned to their. upper positions. The formed cups pass down through the openings 92, 93 and 94 into a suitable receptacle or are conveyed away to another drawing press by any suitable automatic conveying means (not shown). .I have described what I believe to be the best embodiments of my invention. I do not wish however, to be confined to the embodiments shown, but what I desire to secure by Letters Patent is set forth in the appended claims.

I claim: .1. In a drawing press, means for automatically feeding thin substantially flat metal blanks individually to the field of operation of a drawing die from-a stack of the blanks, comprising a feed member reciprocable in a substantially straight path and: arranged to. engage; the bottom blank of the stack and move it. edgewise along-said. pathrto an advanced; position: in alignment with thedi'e and a second teed. member reciprocable in a sub stantially straight path at: an angle to said first 7 mentioned path and arranged tov engage an: edge oi the blank: while in said; advanced position and advance it to the die. v

2.1m. a drawing press as claimed claim I in which. the.- pathsin. which. the said feed members are reciprocable are disposed at substantially right angles to eachother. I

3.. In. a drawing press,, means for automatically feeding thin; substantially flat metal; blanksim on. said firstfeed member, remove the: blank from said-first feed member and advance. the blank edgewiseto-thedie.

4;; In a drawing pressas. claimed: in claim 3' in which a housing isprovided, said housing. having' a slot in which the second feed member is reciprocable andwhichalsoserves a guidewayforguiding the; blank as it is: advanced to thedie.

5. In a drawing press:,-. meansfor automatically feeding thin metal blanks individually to? the 4 held of operation of a drawing die froma stack blanks while said advancedposi'tions and adfvance the blanks to the dies and means for re- ;ciprocatingsaid push rods simultaneously.

a. A. drawing press: as claimed in claim 8 in said single feed member is provided with a. plurality of plates and each. plate provided with a recess adapted to receive the downwardly V bent portion of a blank; therecesses in said 'plates being disposed simultaneously under the bottom blanks of the stacks.

m. In a drawing press, means for automatisally feeding thin substantially flat metal blanks individually and successively from a stack of blanks to the'field'otopera-tion of a drawing die comprising a guide member for said blanks deafining a guidechannel leading to the field of operation of the die, a, feed member reciprocable ina substantiaily straight path and arranged to receivethe bottom blank of the stack and move it edgewise along said path to said guide channel, and-a second feed member reciprocable in saidguide channel at an angleto said first-mentioned path and adapted to engage an edge of the blank in said channel and push said latter blank along the door o'f'said channel to the field of operation of the die.

ef-the blanksat least some of theblanksim: the

stack being curved. and disposedlwithi'their: con;- vex suriaces downward: said: feeding meansjcomprising a feed memben, means-forreciprocating said. ieedmember in a substantially straight; path towards and away ,from the stack; the upper surface of saidieed member being provided with a recess forreceiving" and advancing a. blank edgewise, away from the stack. transversely there oi assaidieed member isreciprocated, the'convex surface of the bottomblank. being.- adapted toextend into said recess;.. and means on said feed, member for engaging atleast a; portion of theyperipheral, edge of the bottom-blank 6. .In a drawing press as claimedin claim 5; a;

combination in. which the marginal; of said recess near its upper portion: is is adapted to engage the surface'of the bottom blank. near its. periphery.

Z. In a drawing press asclaimedin claimad, av

means for automatically feeding the. blanks in dividuallyto the. dies from -.a"- plurality of stacks of the blanks, said feeding means/comprising: a single feed member reciprocable in a: substantially. straight path and arrangedtdengagte the bottom; blanks of the stacks: and 'mo ve: them edgewise to predeternzlined.v advanced which areinqalignment. therespectiva dies,

11. In; a drawing pressgmea-ns for automati cally feeding thin substantially fiat metal blanks individually and successively from a stack of blanks to the field of operation of a drawing die comprising a feed member reciprocable in a substantially straight path; and presenting a. shoulder adapted to engage the rear edge of the bottom bian-k of the stack and carry it edgewise forwardly to an advanced positionwhile the side edges 01 said latter blank remain free from shoulder restrictions. preventing sideways movement of saidlatter blank; and a second feed member reciprocable towards and away fromthe field of operation of the die transversely of said path, and adapted to-engage a side edge of the blank resting on said first feed member in said advanced position, push said latter blank side'- ways' off said first member and advance it: to said field of operation;

1 2:. Ina drawing press, means for automatiaily feeding in recurrent cycles a plurality of substantially fiat th-in metal blanksmmultaneous lytothe fields of operation of acorresponding number of" drawing dies from the: bottom of corresponding number. of stacks, comprising a single re'ciprocable feed member having" a plllrality of blank receiving means spaced therealbng' for stripping the bottom blanks of the stacks simultaneously, and moving them'edgewise unison to advanced positions said feed member, and a: plurality" of reciprocabl'e secondary feeding members operable in unison to engage said blanks while in saidiadvanced positions and move them simultaneously towards saidfield'sof "operations; I

- 13; I'n= a drawing press; the. combination comprising-means for supporting? substantially flat a Humi ty. 101 rods; adapted .to' engage the thin metal blanks ina, plurality of substantially parallel spaced stacks aligned a vertical plane;

plurality' of drawing dies, a'single' f ee'd member reciprocable across the bottoms of all ofsaid stacksupport'ing' means and having means for stripping the bottom blanks of said stackspositions and advancing them simultaneously to the fields of operation of said dies.

14. In a drawing press, means for automatically feeding thin metal slightly curved blanks individually and successively from a stack con taining said blanks to a drawing die, comprising a feed member movable across the bottom of the stack and having means for stripping the bottom blank from said stack and advancing it edgewise away from said stack transversely thereof as said feed member is moved, said feed member having a recess on its upper side adapted to seat the stripped blank, the marginal wall of said recess near its upper portion being inclined to receive the downwardly facing convex surface of a stripped blank, said recess being of such size with respect to the blanks, whereby the upper portion of the edge of the stripped blank will project upwardly above said recess, even if the stripped blank has its convex surface facing downwardly.

15,; In a drawing press as set forth in claim 14, in which said feed member moves the stripped blank in an advanced position, and a second feed member is provided movable to engage the up per projecting edge'of the blank in said advanced position and move the blank to the field of operation of the die.

FRANK H. MALONEY.

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