US1949430A - Method of forming scroll edge metal blanks - Google Patents

Description

Mal-c116, 1934. Y J. H. uRcH 1,949,430

METHOD OF FORMING SCROLL EDGE METAL BLANKS Original Filed Feb. 13, 1929 2 Sheets-Sheet 1 March 6, 1934. J, MURcH METHOD OF FORMING SCROLL EDGE METAL 'BLANKS 2 Sheeis-Sheet 2 Original Filed Feb. 13, 1929 If i ATTORNEY 'Patented6119 34' I 1,949,430

figuration such, for example, as can ends, a more Fig. 3 is a view similar to Fig. 2 illustrating of the desired articles; a lower die cut edge 15 having a scroll cutting my pending application, Serial Number 339,553 In e position f est, the Sheet 17 iS engaged in adouble row, one row containing one more can in the table 11. Spring pressed dogs 25 are posi- .9

- whereby a blank is produced containingcan end Reciprocationof the feed bar 23 causes en- 95 An important object-of the invention is the positioned above and held in spaced relation to 100 can end spaces and providing 'a'blank of uniform and prevents it returningwith the return move- 5 stood from the following description, which, taken preventing displacement thereof.

UNITED STATES PATENT OFF ICB I I 1.049.430 I DIETHOD 0F FORMING SCROLL EDGE John 11. Murch, East Orange, N. 1., assignor to American Can Company, New York, N. Y., a corporation of New Jersey 1 3 Claims. (01. 164-17) The present invention relates to a method of in connection with the accompanying drawings, producing scroll-edged metal blanks. discloses a preferred embodiment thereof.

It is a present custom where automatic ma- 9 Referring to the drawings: chineryis employed incutting a number of articles Figure 1 is a longitudinal section taken through 5 from a sheet of tinplate, or'the like, to first sever a typical apparatus for performing the present the sheet into blanks by a shearing machine and invention. a I v subsequently to feed the blanks so obtained Fig. 2 is a diagrammatic partial plan, partial through a press for the cutting of the desired sectional view illustrating a sheet'in first operatarticles. When the articles are of circular coning position. v

. economical cutting is obtained in a cutting layout 8- sheet in second operating position.

embodying adjacent rowsof articles arranged in Fig. 4 is a view similar to Fig. 2 illustrating staggered relationship. a sheet in a subsequent opera-ting position.

The present invention contemplates the method The machine, of the scroll shear type, illusof shearing ablank containing adjacent staggered trated in connection with the present applica- L79 rows of can end providing spaces; the improved 151011 compri es a able 0 bed 11 formed as 8 p blank representing the maximum economy of n of a base 12. Base 12 is connected with a bolcutting while providing a blank which can be ster plate 13 of the scroll shear, the plate 13 eificiently handled in the automatic'production supporting a die plate 14 on which is positioned One form of shearing machine suitable for surface 16. practicing the present method and for producing Sheets 17 are moved over. the upper surface of an improved blank according to the present inthe table 11 and over the lower die member 15 vention is embodied in the apparatus disclosed in in a series of intermittent forward movements.

on Shearing machine, filed in the United States bya punch member 18 formed with a scroll Patent Oflice on February 13th, 1929. The presedge 19 adapted to cooperate with the scroll edge 'ent method is disclosed insaid application and 16 of the die 15 and produces a winding cut. the present application is a division thereof. Punch member 18 is carried on a punch'plate 21 The principal object of the present invention moving with a press slide 22 of the usual and preis the provision of a method of dividing a sheet 'ferred constructio of metal into scroll-edged metal blanks by action The sheet 17 is advanced over the table 11 by of a single line cutting mechanism, the blank so a feeding device comprising a feed bar 23 having produced containing spaces for can ends arranged reciprocating movement within a slot 24 formed end space than the other row. a tioned in slots 26 cut in the bar 23, the dogs hav- Another important object of the .invention is ing pivotal movement on pivot pins 27 carried bythe provision of a method. of cutting and feeding the bar 23 and being held in normal raised posia sheet of metal to a scroll-edged cutting die tidn by leaf springs 28.

providing spaces arranged in a plurality of rows, gagement of one of the feed dogs 25 with the the spaces in one row being in staggered relation rear edge 'of the sheet 17 and advances it in a r to those in an adjacent row, the scroll edges of step by step movement. Other dogs 29 are pivthe blank closely fittin'g such can end spaces. oted on Pine 31 c d by a retaining bar .32

making of a blank having a scroll formation along the sheet 1'7. When the rear edge of the sheet two opposed edges and containing two rows of 1'7 passes a dog 29, the dog drops downwardly can end providing spaces arranged in staggered by gravity to the position illustrated in the leftrelationthe scroll-edged outline closely fitting the hand dog 29 in Fig. 1. This holds the sheet 1'7 width and contour from which can ends may be ment of the feed bars 23. Each dog 29 is formed out ,with a minimum waste of material. with a lateral opening 33 which surrounds a pin Numerous other objects and advantages of the 34 positioned on the bar 32 and this construction inventionwill be apparent as it is better .underpermits a limited movement of the dog while 'carried on the bolster plate 13 to out certain notches from the sheet 17 as it is moved through the machine.

Sheet 1': (Figs. 2, s and 4) is adapted to be cut into blanks and when the blanks are to be used for circular articles, such as can ends, a stagger layout is used, this type of layout being more economical of the material in the sheet.-

Sheet 1'! may be s a id to have a series of potential can end providing spaces and the outline of one cutting layout herein illustrated shows the can blank or disc by dotted circular lines. These circles are arranged in rows, one row being adjacent the edge of the sheet and each disc being in staggered relation, this insuring the maximum efliciency in sheet cutting.

When sheet 17 is brought to its flrstcutting position, illustrated in Fig. 2, the punch members 18, 35 and 36 make their downward stroke and cooperate with their associated die members. In this first cutting action, there are severed from the front edge of the sheet two corner pieces '41 one of which is removed from each forwardcorner by the punch member 35. There is also removed from the sheet two rectangular pieces 42 obtained by the cutting action of the punch members 36.

For the purpose of clearer illustration, the severed parts 41 and 42 are shown on the right-hand side of Fig. 29 as being separated or removed from 'the sheet 1'7. This is merely a diagrammati'c showing of the operation and does not truly indicate relative positions of the parts during the cutting operation.

' Sheet 11 upon being advanced to its second cutting position (Fig. 3) has certain parts removed, these comprising a front trim piece 43 resulting from the action of the punch member 18, two corner pieces 44 cut by action of the member 18 from the two opposite front corners of the sheet, end pieces 45 severed from the sheet by the punch members 35 and rectangular pieces 46 similar to the pieces 42 previously mentioned resulting from a cutting action of the member 36.

A front scrolled edged? results from this trimming action-in the second operation, by reason of the winding cut of the scroll surfaces 16 and 19 and embodies spaced projecting parts 48. The sheet is shaped by the cutting actions now being described, to provide a long section 49 containing a row of end providing spaces 51 and there is provided a short section 52 which contains a row of can end providing spaces 51 adjacent to and in staggered relation with the spaces 51 1 ing a blank 54 from the remaining part of the- .3. 'front of the sheet, other parts 44,45 and 46 are of the long section. This short section'is adjacent the long. section and lays between certain side edges of the sheet formed by the removal of the pieces 45.

Following the next advance location of the sheet 17 in the scroll dies, the third cutting operation takes place (see Fig. 4) at which time the punch member 18 cuts a scroll edge '53 by seversheet 17. This blank contains one long section 49 ofcan end providing spaces 51 and an adjacent short section containing a short row 52 of the spaces- By reason of the long section and ,the short section construction there is one less can endproviding space in the latter.

At the time the blank 54 is removed from the being severed from the edges of the sheet. These parts are removed from the sheet as an incident to proper shaping of the same-for production of the two row blank. While in many cases the pieces 45 are available for use in the manufacture of smaller container parts the pieces 41, 42, 43, 44 and 46 are usually discarded as being too small for use.

The forming of parts of the sheet and the final severing of a blank 54 therefrom continues throughout the entire length of the sheet at each cutting operation, the same cutting mechanism actinggin synchronism with the advance movement of the sheet 17 by the sheet feeding device.

The'particular form of the blank 54 produced in carrying out the present invention is particularly adapted to subsequent feeding in automatic machinery for removing can ends or other articles from theproviding spaces 51. It will be evident that the cutting off of one blank 54 properly spaces'the front edge of the sheet for the next machinery and at the same time presents a high degree of cutting eiliciency.

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 arrangement of the parts without departing from the spirit and scope of the method or sacrificing all of its material advantages, the details hereinbefore described being merely a preferred performance thereof.

I claim:

, 1. The method of producing scroll-edged metal blanks, which comprises cutting a sheet of metal at an interval with scroll cuts, producing blanks of 'the same scroll formation along two opposed edges thereof, each blank when so cut comprising a long section extending longitudinally and an adjacent short section also extendinglongitudinally, said long section providing spaces for a given number of can ends, and said short section providing spaces for a less number of can ends, the-indented parts of the scroll at one edge of the blank being opposite to and in line with the projected parts of the scroll at the other edge of the'blank, and during said interval feeding the sheet for a distance which will contain two rows of can ends, whereby said blanks provide material for can ends with the minimum amount of wastage in subsequent can end cutting. t. The method of producing scroll-edged metal blanks formed .of a double row of'can ends providing spaces-which comprises cutting a sheet'of metal at intervals with winding cuts producing a series of said blanks of equal size and shape,

each blank having a scroll formation along two opposed edges and containing an even number of rows of can'ends providing spaces, said spaces in one row being one less in'number and bein in staggered relation to the spaces in the other row, whereby said spaces adjacent the scroll edges of the blank extend into thewider parts thereof to produce a minimum area of blank in excess of-the combined area of .said can end providing spaces, and feedingthe sheet between cuts a dis- I tance equal to an even number of rows of can which the'disks of one row will alternate with ends when the latter are arranged as described. the disks of the other 3. The method .of producing scroll-edged sheet the sheet by a. similar sc metal. blanks, which comprises severing a. sheet of metal by a scroll-cut, then feeding the sheet a distance to furnish two rows of disk-spaces in row, and then severing roll-cut.

JOHN MURCH.

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