US1619227A - Blank-shearing apparatus - Google Patents

Description

March 1 1927. 1,619,227

E. WlDELL ETAL BLANK SHEARING APPARATUS Filed Jan. 21. 1922 3 Sheets-Sheet 1 I 1,619,227 March 1 1927' M. E. WIDELL ET AL 4 BLANK surname APPARATUS Filed Jan. 21. 1922 speets-sneetz March 1 1927. E7 wlDELL ET Al.

BLANK SHEARING APPARATUS Filed Jan 21, 1922 3 Sheets-Sheet 5 fig .6

III

. Patented Mar. 1, 1927.

UNITED STATES PATENT OFFICE.

'mAGNUs E. WIDELL, or CINCINNATI, OHIO, AND FRANK nonom m, or MONTCLAIR,

new JERSEY, Assrenons TO AMERICAN. CAN COMPANY, or NEW YORK, 1\T.'Y., A

CORPORATION OF NEW JERSEY.

BLANK-SHEARING I APPARATUS.

' Application filed Ianuary 21, 1922. Serial. No. 530,776.

This invention relates-in general to shearmg machines and has more particular reference to an lmprovement in such machines whereby recovery pieces from the metal sheet being operatedupon may be obtained .in an eflicient and rapid manner.

It isthe present custom where automatic machinery is employed in the cutting of a number of articles from a sheet of tin plate, to first sever the sheet into strips by a shearing machine and subsequently to ,feed the strips so obtained through a press for the cutting of the desired articles. When the resultant article is of a circular configuration it is the common practice to out such circular disks from-adjacent rows of the tinplate in a staggered formation. ,This permits a moreeconomical cutting of the sheet and provides a minimum amount-of wastage.

In order to make use of an automatic feed in connection with a press cutting the desired articles, it is'usually necessary for the strip to contain one row of disk spaces. The strip is so formed as to accommodate the cut ting of the round disks in staggered forma-- tion by being provided with ascroll or undulating edge which permits the same economy as if the disks were directly out from the sheetsin staggered relation.

In the cutting of this staggered strip it is .found that spaces occur at the ends of the strip which are'not suflicient in size to make a complete disk. It is desirable from the standpoint of econom and is the customary practice when a con ition of this kind occurs,'to cut from the spaces left other smaller shapes known in the art as the recovery.

the metal containing therecovery space from the strip and thence feeding the same into a recovery press where the final recovery is out. To accomplish the removal of the metal strip, a transverse cut is made by a cutting ed e oifsetfrom the face of an in a plane slightly beneath thatof the shearing die. By this method the transverse line across the end of the strip .andthe shearing line alon the edge of the strip are cut at slightly. ifierent periods of time with the result-that the recovery and is buckled and distorted. It has been found in practice that this'distortion seriously interferes with the correct feeding and cutting of the recovery end in a: recovery press, and it is toward a. removal of this trouble that our present in vention is'directed.

Our invention contemplates and has for a principal object the economic cutting of the nalv recovery in thesame machine now employed for shearing the strip and permits the recovery to be removed previous to the.

removal of the metal from the end of the strip. The buckling of the skeleton metal left inthe end of the strip after the "removal of the recovery 'is, therefore, of no consequence inasmuch as the metal is discarded as scrap.

Another object of our invention is the pro vision of an improved method which dispenses with the entire operation at present needed of transferring the stri ends from the shearing machine and feeding the same into a separate recovery press.

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

Referring to the drawings, f

Figure l is a vertical section through a shearing press in which our invention is embodied; v

Fig. 2 is a plan View, partially in section, iaken substantially on .the line 2- 2 in Fig. 3 is an enlarged detail section taken substantially on the line 3-3 in Fig." 2;

and

Fig. 4 is a plan view of a portion of the metal sheet from which the blanks are formed, showing in outline the form of the main strips and the recovery blanks which are cut out by the 'press. 7

Upon the drawings illustrating the invention, the reference numeral 11' indicates a body frame which is-supported upon a base 12 and has mounted thereon a' table 13 and die members 14 and 15 suitably secured thereto. A shearing die support 16 is mounted for reciprocation in a frame yoke member 17, a dovetail connection indicated at 18 being provided between these parts.

Intermittent reciprocation of the member 16' is accomplished by means of crossheads 19 mounted upon vertical rods 21 and secured to a horizontal rod 22 having been ings 23 protrudin from a dieplate 24 carried by the mem er 16. The rods 21 are actuated by eccentrics contained in brackets 25 and operated by a power shaft 26,

said rod being secured to the actuatingmembcrs at each end by nuts 27 and 28 respectively. The weight of the die support 16 is counterbalanced by springs 29 carried on rods 31 which are secured by nuts 32 and 33 to the frame yoke member 17. The springs are confined between end disks 34 on the rods 31 and a plate 35 through which said rods extend and which is secured by bolts 36 extending through a downturned extension 37 to a part 38 of the movable mounting for the die support 16.

The blanks are fed in any preferredamanner over the table 13 and upon the stationawry die parts 14 and 15. In order that the die action may befully understood, attention is directed first to Fig. 4 in which the reference numeral 41 indicates the outline of the main strips to be cut and the numeral 42 indicates the outline of the recovery which,v in the practice of our invention, is removed prior to the action of the dies upon the boundary lines of the main strip in which it is contained. As has heretofore been pointed out, the transverse line 43 has,

in certain types of machines, been severed now described.

The die member 14 is provided with an aperture 4.6 of the form of therecovery and secured in the die plate 24 is a cutting punch 47, adapted tocooperate with the aperture 46- to remove the recoveries indie cated in Fig. 3 by-the reference numeral 48. or blanks fall into a. chute Said recoveries 49 by which they are directed to a trough or receptacle ,51 secured in suitable manner to a projection 52 from the frame 11. sheets to be operated upon, which are desig nated: by the reference, numeral 53, are ad vanced' over the table and the members, and the main strips are cut out by the action of a cutting or shearing (lie 54 secured in thematic-'24 and cooperating with the l ower fixed die member 15. Said fixed die-member is-provided with along apertnre55 of the scroll or undulating form desired, and thedie 54 is oi correspondi formation and adapted topass into sci-id aperture as indicated in Fig. 3. The cut Thelower die out strips 56 and 57 fall respectively through said aperture and over the outer side of the die member 15 and are both caught in a trough 58 secured to the side of the frame 11. A chute 59 is provided to direct the strips 56 to said trough and together with. the chute 49 is fixedly secured at 61 to the die member 14. The apertures 46 and 55. are flared outwardly and enlarged in the lower )arts of the die members 14 and 15, as-in icated at 62 and-(i3. It will be noted that when the alternate strip spaces 41, which contain the irregular ends from which the recoveries are cut, reach a position beneath the die 54 said-recoveries are completely removed leaving blank spaces 64 at the/ends of said strips. The die member-15 is providedwith bridges 65 and 66 positioned beneath the lines 43- of the strips, the purpose of these bridges being-v to permit die edges 67, provided in the die 54, to. sever saidtransverse linesA-S- so-ithat the entire skeleton, indicated tit-69, is removed, leaving a plain shortstrip, which isdesignated in- Fig. 3- by the reference numeral 56.. It will he apparent that any bucklingof the matal'oithe skeleton part 69 through the actionuof die edges 67 is immaterial sincethe recove been removed. and; said she eton part is merely wastage. Furthermore, the method herein described eliminates the necessity for has al-read subsequent operation in another press to remove the recoveries, and a great saving of time and equipment is thus accomplished. The frame 4 yoke members ,17 are secured .-to

the table bybolts 71 passing through eaten sions-72of said members, and it will be ohserved that the objects of my invention areeffectively accomplished with relativelysimpile structure 'involvingbut'sli ht variation in mechanism and actionfrom t leus'ual type of shearing press.

It isthought-that the invention and many of-its atten ant advantages will bcut1derstood from the foregoing description, and it will be apparent that various changes may be madein the form, construction andarrangement of-the arts without departing from the spirit andi seope of the invention: or sacrificini all 01E itsmaterial advantages, the formereiab'efore a preferred embodiment thereof.-

We claim:

1.! In an apparatus for cutting metalsheets to form'blanks fromuwhich can ends and the described being merely:

like may ,beformedithe combination of cul'f-E ternatin ting the Ia-nks into transverse strips,- the-latting. dies'elougated- ,trmsverselyto the dire-o. tion: of the feed ot the sheetsa-nd having -alwide and narrow portions for cuttor-containing: waste portions, and dies-aw.

rangedin line with the end:

portions of the: blank-cutting dies and operating in advancethereof at the sides of the sheets for cutting-- supplemental blanks'f'rom said waste portions of said sheets, said advance dies belng arranged to be in line with said waste portions only at the moment of cutting.

2. In an apparatus for cutting metal sheets to form blanks fromwhich can ends and the like may be formed, the combination of cutting dies having alternating wide and narthereof for cutting supplemental blanks from parts of said sheet which in the action of said first mentioned blanking dies will become wastage, both sets of sa1d (hes acting upon the sheet simultaneously-and the advance dies only acting on said'wastagc before the latter arrives at the main cutting dies. I

3. In an -apparatus for cutting metal sheets to form blanks from which can ends and the like may beformed', the combination of cutting dies extending across the line of feed of the sheets and having alternating wide and narrow portions forcutting the blanks into transverse strips, and dies ar ranged in line with the end portions of said cutting 'dies and operating in advance there of for cutting blanks from parts of said sheet which in the action of said first mentionedblanking dies become wastage, said last mentioned advance dies operating on the sheet only at its sides and at the ends of alternating rows of the blank lay-out. I 4. In an apparatus for cutting metal sheets to form blanks from which can ends and the like may be formed, the combination of scroll-cutting dies having alternating cutting dies and in wide and narrow portions adapted to cut the sheet into strips from which can ends andthe like may be cut with minimum wastage, and means associated therewith arranged in advance of said scroll-cutting dies and in line wvith their end portions for cutting out a strip end in advance of said dies and only from a part'of the sheet which in the action of said dies will become wastage. I

"5. In an apparatus for cutting metal sheets to form blanks from which can ends and the like may. be formed, the combina- -tion of scroll-cutting dies extending across the line of feed of the sheets and having alternating wide and narrow portions adapted to cut the shcetinto strips from which can ends and the like may be cut with mini- 'mum wastage, alternate of said strips having widened ends, and means associated therew 1th arranged in advance of sa1d scrolltions for cutting out a blank of desired form in advancc'of said dies from-said widened ends of-the strips which in the action of said dies will become wastage.

6. In an apparatus for cutting metal sheets to form blanks from which can ends and the like may be formed, the combination line .with their end porof main blanking strip-cutting dies having alternating wide and narrow portions and elongated and extending across the line of feed of the sheets, and recovery dies located on the lines of feed of the wastage and opcrating in timed relation to the main dies,

an apparatus for cutting metal sheets to form blanks from which can ends and thclikc may be formed, the combination of transversely elongated blanking striprutting dies having alternating wide and narrow portions for cutting on transverse scroll lines a maximum number of strips from a sheet for the making of can ends and the like, and means associated therewith arranged in advance of said scroll-cutting dies and in line with their end portions for cutting blanks of other configuration from said sheet at'points which become the widened ends of said blanks. p

8. The process. of cutting metal sheets for the formation of can ends and the like,'which consists in first cuttingrelatively small blanks along the side edges of the sheets, and

cutting said sheet into scroll like strips, so

that alternate strips include the spaces for' mcrly occupied by said relatively small blanks, the cutting of said strips and the cutting of said small blanks being simultaneously performed but at diiferent stations.

9. A method of cutting metal sheets'so as to dividethem into strlp-blanks of scrolllike form and waste portions, in which method formed blanks are out from said waste portions while the latter are integral with the said sheets and at the same time that the strip-blanks are cut but at different stations. I

10. A .method of cutting sheet metal blanks which consists in progressively feeding and cutting the sheet into the desired scroll strips and waste portions and, before sa1d waste portions are separated from the sheet, punching smaller shaped blanks from withsuitable opposing dies, of a scroll dier extending transverse to the line of feeding of said sheets, and a punch connected and operating with saldscroll die and arranged tion thereof, and acting'on successive parts of the sheet before said 'parts are fed to the scroll die. I

12. In the herein described method of cutting strip blanks having alternating wide at the rear thereof in line with an end porand. narruw portions, and of recovering smuzller formed-i blanks from the ends of alternate strip blanks which consists in removing alternate etripbln'nks from the metal 5 sheet: at asuitiible distance from the end of the sheet so that two of said blanks are formed at one cutting, and.- st each cutting removing smaller formed. blanks along, the edges of the sheet, and advancing the sheet with an intermittent movement, each movement being .for a distance equal to the widthof two of said strip blanks.

MAGNUS E. WIDELL.

FRANK-

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