US1884708A

US1884708A - Apparatus for forming sheet metal caps

Info

Publication number: US1884708A
Application number: US484844A
Authority: US
Inventors: George R Jeneson
Original assignee: American Can Co
Current assignee: Primerica Inc
Priority date: 1930-09-27
Filing date: 1930-09-27
Publication date: 1932-10-25
Anticipated expiration: 1949-10-25

Description

Oct. 25, 1932. JENESON 1,884,708

APPARATUS FOR FORMING SHEET METAL CAPS Filed Sept. 27, 1950 3 Sheets-Sheet 1 INVENTOR Oct. 25, 1932. JENESON I 1,884,708

APPARATUS FOR FORMING SHEET METAL CAPS Filed Sept. 27, 1930 I5 Sheets-Sheet 2 g INVENTOR unease a. Jamison, or cmcmuar'r, c1110, assrenon "ro Alumni can A CORPORATION or NEW .rnasmr Patented Oct. 25, 1932 UNITED STATES PATENT OFFICE OI NEW YORK, 11. Y,

COHPANY,

APPABATUS FOR FORMING SHEET MET-AI.

Application and September e1, 1830. serial means.

The present. invention relates to an aparatus for forming sheet metal caps and as particular reference to a self-contained press mechanism wherein a series of operations are performed upon the can during its formation.

The principal object of the present invention'is the provision of a cap formin mechanism' having punch and die mem rs for drawing the cap into cup shape and curling or otherwise bending its edge by means of an independent curling die device, all of these operations being rformed during one cycle of movement of t e mechanism.

An important. object of the invention is the provision of a cap-forming mechanism which draws an incomplete cap or shell from flat stock while forming a peripheral edge or from started flange between shaping members.

An important object of the invention is the provision of alocking device for holding the cap, after, being part1ally drawn during certain further stages of its formation.

An important object of the invention is the provision of a cap forming mechanism adapted to sever a disc from a strip of sheet metal a-nd'to form and completely shape the cap in a novel and eflicient manner within one operating stroke of the forming mechanism.

Afurther important object of the inven tion is the provision of a cap forming mechalccking device for holding is being curled, this holding device being adjustable in its-time operation relative to the other operations of the mechanism. W

Numerous other objects ofthe invention will be apparent as it is better understood the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

Referring to the drawings:

Figure .1 's a transverse sectional view taken through a cap forming apparatus embodying the present invention, the view illustrating the relation of parts prior to operation on a strip of sheet material;

' Figs. 2, 3 and 4 are enlarged fragmentary views of a portion of the of cutting left-hand side of Fig. 1, these views illustratingdifi'erent positions ofthe forming mechanism during the different; stages of formation of the cap;

Fig. 5 is a fragmentary end elevation of the cap forming apparatus;

Fig. 6 is a sectional view of a disc of sheet material from which a cap is formed {and Figs. 7 and 8 are sectional views of the ca in different stages of formation.

n the present embodiment of the invention there is illustrated a cutting die for first severing a disc from a strip of sheet material. It will bezobvious that this step ma be eliminated and a ously formed so blank used in the first'instance.

The apparatus illustratm the invention is embodied in a standard orm of press and comprises a die plate 21 (Figs. 1 to 4 inclusive) which is mounted on a plate 21 sup orts an annular die cutedge 23 securely he cl in position by a clamping ring 24.

Mounted concentric with the cutedge 23 is a die center or anvil consistin of an anvil ring 25 and an inserted panefiflock 26, the former being embedded n the die plate 21.

a The outer wall of the anvil ring 25 is spaced nism of the character described having a f the partially .lormed cap during the time its edge rom the inner wall of the cutedge 23 and a draw ring 27 and a curling die 28 operate vertically within this space.

'. The draw ring 27 rests upon and is supported by an annular member 31 which, in

e upper ends of verticalturn, rests upon th ly extending rods 32 projecting from a disc Sresting on a drawing rubber 34 which is confined between the disc 33 and a lower disc 35, as illustrated in Fig. 1. The rods 32 extend through vertical bores 36 and 37 formed res actively in the die plate '21 and'in the bed 22 and these rods have vertical movement therein as will be hereinafter described.

' A bolt 41 1s threadedly engaged in the die v plate 21 and extends through an openin 42 formed in the bed 22. The lower end 0 the bolt extends through vertical bores 43" and 44 formed centrally of the discs 33 and prev1- disclosed for the purpose of (press bed or bolster plate 22 in the usual an preferred manner. The die this bolt 41. An initial compression of the.

drawing rubber 34 is adjustably made by a locknut 46 threadedly engaging the lower end of the bolt 41, a washer 47 being interposed between the disc 35 and the nut 46.

The cuted e 23 provides an annular chamber 48 interiorly thereof and this chamber unites with a depressed annular countersink 49 formed in the die plate. It is in these

chambers

48 and 49 that the draw ring 27 and the annular member 31 move during certain operations of the mechanism. The parts of the press just described constitute the die elements for the apparatus. I

The punch parts of the apparatus are carried in the usual manner as by a slide member which moves up and down above the die parts. This slide member forms no part of the novelty of the present invention and illustration and further description is, therefore, omitted. Such a slide, however, carries a punch member 55, having a usual form of stem 56. This punch member moves up and down above the die parts and carries an annular punch cutedge 57 which moves in alignment with the draw ring 27.

An annular holding ring or member 61 is located on the inside of the member 57 and has sliding vertical movement therein. This ring is counter-bored at 62 to provide sliding clearance for a combined knockout and forming pad 63 carried on the lower end of a knockout rod 64 extending upwardly through the punch member and through its stem 56, as illustrated in Fig. 1.

The stem 56 is counter-bored at 65 and a spring 66 extends therein, encircling the upper end of the rod 64, the spring'being confined between the stem and locknuts 67 which threadedly engage the upper end of the rod 64. A lower face 68 of the pad 63 is formed according to the panel configuration desired in the finisheddrawn cap and this surface cooperates with a similarly formed face 69 of the panel block 26.

The member 57 is slotted on opposite sides at 71 and a plate 72 (Figs. 1, 3 and 5) extends diametrically across the member and projects outwardly on both sides thereof. This plate 72 carries the holding ring 61 to which it is secured and controls its position during certainsteps in the cap forming operation, as will be hereinafter'described. A lower surface 75 of the ring 61 is profiled or shaped to fit the upper edge of the shell being drawn and this e ge corresponds with agigisilarly formed upper edge 76 of the an- The punch member 55 and parts carried thereby are first lowered for the cutting and cap forming operations and in this lowering action the member 57 comes down on to the strip designated by the numeral 78 (and aesavos clamps it against the draw rin 27, forcin it and the strip downwardly. T e

pad63aso engages the strip as the outer cuttlng wall of The

members

57 and 27, in their clamping action on the disc, produce a slip grip which holds the oumr edge of the disc durin the drawing operation that immediatel fol ows. This slip grip is produced in part y the resisting actlon of the drawing rubber 34 which at all times resists the downward movement of the member 27 under the depressing action of the moving

parts

55 and 57. This drawing rubber resistance is transmitted through the annular member 31, its ins 32 and disc 33.

The curling die 28 ig. 2) is provided with a tapered shoulder 80 which is engaged by a similar shoulder 81 formed on the interior of the draw ring 27 and lowering movement of the latter forces the curlin die downwardly therewith. The curling ie 28 rests upon the upper ends of vertically extending ins 82 (Fig. 1) which extend through

t e chambers

48 and 49 through a vertical bore 83 formed in the die plate 21 and through a similar bore 84 formed in the bed 22.

The rods 82 at their lower ends are carried in a collar 85 which is slotted at 86 to provide clearance for the rods 32,'the collar moving up and down with the curling die. The collar 85 has sliding movement on the bolt41 and extends downwardly in a hub section 87 in which is cut a peripheral groove 88. A roller 89 loosely mounted on a pin 91 carried by one arm of a lever 92 operates within the groove 88.

The lever 92 rocks on a shaft 93 carried in a bracket 94 projecting downwardly from the bed 22. The opposite end of the lever 92 carries a pin 95 on which is rotatably mounted a roller 96 operating in a cam groove 97 formed in the face of a cam 98 which is carried by a shaft 99. Rotation of the shaft 99 is in 'sy'nchronism with the raising and lowering of the punch member 55 and the cam 98 carried by the shaft thus controls rocking of the lever 92 and through the described connections raises and lowers the curling die 28. It will be understood that this cam 98 cooperates'with the movement of the draw ring 27 when the latter is being depressed and when the shouiders 80 and 81 are locked together.

By the time the punch member 55 and the parts carried thereby, have reached the end of their downward travel, the disc 79 has been drawn on into a shell 101, (Figs. 2 and 7). In producing this shape, cooperation of the

members

26 and 63 have formed the central panel a, the holding member 61 and the edge 76- of the anvil 25 have coo rated to form the upper curved ridge 6 o the shell An edge (i of the shell is formed on the member 57 and V the punch member 55,

The two

members

57 and 27 provide the 5 proper slip grip throughout this drawing action and prevent formation of wrinkles. not drawn off but is left projecting at a slight angle to wall 0 and is shaped between a convex edge 102 a cooperating concave groove 103 formed on the upper edge of the curling die 28.

During the last part of the forward or downward stroke of the punch member 55, certain devices operate to lock the plate 72 in its lowermost position. These devices comprise a pair of blocks 105 (Fig. 1) inserted in slots 106 cut in opposite faces of each block being held in its slot by a screw 107. Each block pro jects outwardly beyond the outer wall of the punch member and carries a screw-108 threadedly secured therein, the screw having tion illustrated in Fig. 2 wh a squared head 109 adapted for engagement with i of adjustment.

Near the end of the downward movement of the member 55, the lower end of the screw 108 engages a projection 111 of a latch memher 112 which is pivoted on a in spaced lugs 114 formed in a stationary frame 115. This. frame 115 is preferably a part of the press frame. The latch 112 is thereupon rotated on its pivot into the posierein ashoulder V 116 formed in the latch engages the outer till end of the plate 72. Thelatch member 112 in this position rests along side a projection 117 of the block 105. a

Each latch 112 carries a bolt 118 threadedly secured thereto and lock 119. A roller 121 is rotatably mounted on the bolt 118 and, therefore, moves with the latch member. An upper inclined cam surface 122 is formed on the upper edge of the rojection 117 for a purpose which will now e described.

Beginning from the position assumed by the parts at the lowermost end of travel of the punch member 55 and the parts carried thereby (gig. 2), consideration should be given to ig. 3 which illustrates the parts alter the first upward movement. The plate '72, it will be observed, is held by the latch members 112 and this retains the holding member 61 in lowered position on the drawn shell 101 holding the shell on the anvil25.

During this initial upward movementlhe punch member moves away from the up per surface of the plate 72 and the member 57 carries its rounded edge 102 away from the extending edge d of the shell 101. The curling die 28 remains in its lowermost position, the draw ring 27 moving upwardly and remaining in contact with the lifting punch a. wrench or other tool for the purpose pin 113 carried ed in place by a nut while thepunch parts member 57, this follovn'ng movement beingeffected by the drawing rubber 34. The shoulder 81 moves away from the shoulder 82, the annular member 31 moving upward ly into engagement with the lower edge of the curling die 28.

The parts are now in position for the curl- 7 ing operation which takes place as the punch member 55 continues its upward movement and until the parts. are brought into the position illustrated in Fig. 4. During such movement the holding member 61 prevents any upward movement of the drawn shell 101.

' The drawing rubber 34, acting through the annular member 31, causes the draw ring 27 to follow the rising punch member. Simultaneously the cam 98 rocks the lever 92 and lifts the curling die 28 in unison therewith. The edge d, resting against the rising curling die, is thus bent or curled outwardl3 and into an annular groove 125 formed on the inside wall adjacent the upper face of the draw ring 27. This wall forms a. continuation of the concaveupper die surface of the curling die 28 and completes the curling action on the edge of the shell forcing it upward and inward, thus producing an annular curled edge e (Figs. 4 .and 8).

During such upwardmovement of the punch member 55, thet-apered cam surfaces 122 of the blocks engage their respective rollers 121 and swing the upper ends of the latch members 112 outwardly on their pivots 113 and into the position illustrated in Fig. 1 as the end of the curling operation takes place. The shoulder 116 of each latch 112 frees the end of the latched bar 72 and the remaining upward movement of the punch member 55 takes place without interference with these latch members.

During the final upward movement of the punch parts, the bottom edges of the slots 71 of the punch members 57 pick up the bar 72 and carry its holding member 61 upwardly, releasing the shell. The draw ring 27 at such time continues upwardly under the continued action of the drawing rubber 3 1. The shell 10], being also'released from the holding action of the knockout pad 03, moves upwardly,.the draw ring 27 acting as a knockout member for the shell.

The drawn shell is thus stripped from the anvil ring 25 and moves upwardly inside of the punch member 5'4". its the punch memleer 55 approaches the end of its upward stroke, the upper end of the knockoutrod 64 (Fig. 1) is engaged by any suitable projecting member 127 associated with the press frame in any suitable manner. This momentarily stops the upward movement of the knockout rod 04 and the knockout pad 03 55 and 5." continue npwardly to the end of their travel. This stri 'is the drawn shell from the punch member 5? and allows it to fall out of the machine.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form,'construction and ar rangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. In a cap forming apparatus, the combination of a pair of opposed, substantially concentric ,instrumentalities having a for,- ward and a return movement and clamping a disc positioned therebetween in a slip grip, an anvil coactive with said instrumentalities durin their forward movement for drawing said isc from betweenthe slip grip of said instrumentalities and into one of them thereby shaping the disc into a cap having its edge left projecting, a curling die located within one of said instrumentalities and in alignment with the said projectin cap edge, and means for actuating saidcur ing die during the return movement of said instrumentalities and shapin said projecting edge into an cap.

nation of a pair of opposed substantiallyv concentric instrumentalities having a forward and a return movement and clamping a disc positioned therebetween in a slip grip, an anvil coactive with said instrumentalities durin their forward movement for drawin said isc from between the slip grip of said instrumentalitiesand into one of them thereby shaping the disc into a cap having its edge loft projecting, a holding member cooperating with said anvil for holding said cap thereon during the initial return movement of said instrumentalities, a curling die separate from the lower gripping instrumentality and located within one of said instrumentalities and in aligment with the said projecting cap edge, and means for actuating said curling die while the said cap is held on said anvil and shaping said projecting edge into an annular curl thereby producing a finished cap.

3. In a cap forming apparatus, the combination of a pair of opposed, substantially concentric instrumentalities having a forward and a return movement and clamping a disc positioned therebetween in a slip grip, an anvil coactive with said instrumentalities during their forward movement for drawing said disc from between the slip grip of said instrumentalities and into one of them thereby shaping the disc into a cap having its edge left projecting, a holding member'cooperating with said anvil for holding said cap thereon, looking devices for locking said holding member in cap holding position during the initial return movement of said instrumentalannular curl thereby producing a finished.

member in ties, a curling die se arate from the lower gripping instrumenta ity and located within one of said instrumentalities and in alignment with the said projectin cap edge, means for actuating said curlin me while the said cap is held on said anv-i and shaping said projecting .edge into an annular curl, an means operating through said locking devices for releasing said holdinglmember from cap holding position during t e final return movement 0 said instrumentalities.

4. In a cap formingapparatus, the combination of a pair of opposed, substantially concentric instrumentalities having a forward and a return movement and clamping a strip of sheet material positioned therebetween in a slip grip, a die cooperating with said instrumentalitzes and cutting a disc from said strip, an anvil coactive with said instrumentalities during their forward movement for drawing said disc from between the slip grip of said instrumentalities and into one of them thereby shaping the disc into a cap having its edge left projecting, a curling die located within one of said ins'trumentalit-ies and in alignment with the said projecting cap edge, and means for actuating said curling die during the return movement of said instrumentalities and shaping said projecting edge into an annular curl thereby producing a finished cap.

5. In a cap forming ap aratus, the combination of a pair of oppose substantially concentric instrumentalities having a forward and areturn movement and clamping a disc positioned therebetween in a slip grip, an anvil coactive with said instrumentalities during their forward movement for drawing said disc from between the slip grip of said instrumentalities and into one of them thereby shaping the disc into a cap having its edge left projecting, a holding member cooperating with said anvil for holding said cap thereon, looking devices for locking said'holding cap holding position during the initial return movement of said instrumentalities, a curling die located within one of said instrumentalities and in alignment with the said projecting cap edge, means for actuating said curling die while the said cap is held on said anvil and shaping said projecting edge into ing through said locking devices for releasing said holding member from cap holding position during the final return movement of said instrumentalities, and adjusting means for altering the time of operation of said releasing means.

6. In a cap forming apparatus, the combination of a pair of opposed, substantially concentric instrumentalities for clamping a disc positioned therebetween in a slip grip, an anvil and a curling die separate from the lower' gripping instrumentality and located in one of said instrumentalities, actuating an annular curl, means operatmeans for moving one of said instrumentalities and drawing sald disc over said anvil into 'cap form with a projectin ed e clamped and shaped between said curling die and said In a cap forming apparatus, the comhi-.

nation of a pair of opposed, substantially concentric instrumentalities for clamping a disc positioned therebetween in a slip grip an anvil and a curling die located in one 0 said instrumentalities, actuating means for moving the other of said instrumentalities and drawing said disc from its slip rip and over said anvil into cap form, means or actuating said curling die operable separately from the lower grippin instrumentality to reshape the edge of'said drawn cap into annular curled form, and devices preventing return of a part of said last mentioned instrumentality while holding said cap on said anvil during its edge curling operation.

8. In a cap forming ap aratus, the combination of a pair of oppose substantially 0011-. centric instrumentalities having a forward and a return movement and clamping a disc positioned therebetween in a slip grip, an anvil coactive with said instrumentalities during their forward movement for drawing said disc from said slip 'gri thereby shaping the disc into a cap, means For actuating said curling die during the return movement of a part of said instrumentalities and thereby curling the edge of said disc, and means for holdin other parts of said instrumentalities in fixed position and said cap on said anvil during said edge curling operation.

GEORGE R. JENESON.