US2842834A - Methods of applying laminations - Google Patents

Description

y 5, 1958 J. M. MACCHIONE 2,842,834

METHODS OF APPLYING LAMINATIONS Original Filed Sept. 21, 1949 5 Sheets-Sheet 1 July 15, 1958 J. M. MACCHIONE METHODS OF APPLYING LAMINATIONS Original Filed Sept. 21, 1949 3 Sheets-Sheet 2 @mne/ July 15, 1958 .1. M. MACCHIONE 2,342,834

METHODS OF APPLYING LAMINATIONS Original Filed Sept. 21 1949 3 Sheets-Sheet 3 aue/zzo (ICC/5 5072% jif.

7 received in the industry..

d sP ei- D 2,842,834 METHODS OF APPLYING LAMINATTONS John M. Macchione, Park Ridge, Ill.

Continuation of abandoned application Serial No. 116,935, September 21, 1949. This application January 25, 1955, Serial No. 484,051

Claims. (Cl. 29-15561 This invention relates to apparatus for and methods of applying laminations and is a continuation of my co-pending application Serial No. 116,935 filed September 21; 1949 now abandoned. Cross reference is hereby made to applicants copending application Serial Number 542,274, filed October 24,1955, entitled Apparatus for Applying Laminations, which is a division of this application and which claims certain of the subject matter originally claimed in this application. i

This invention relates to improvements in methods of applying laminations, such as the conventional E andI shaped plates or laminae in interleaved relation to or upon a coil in the building or assembling of magnetic cores for transformers, chokes or other electrical devices requiring a laminated core. v

I am not aware of apparatus capable of simultaneously applying both the E and the Ifplates to a coil but I am aware of apparatus devised for the application of the E plates alone to the coil, the I plates being applied between the E plates of the partly finished coil as a hand operation and which, of course, increased the cost of such cores.

Sheet iron plates or rolled strips from which such plates are made are not uniform in thickness as they come from the mill. This is true between plates or strips in the same lot and between dilferent parts of 'the'same strip. For instance, in making plates from sheet iron plates or strips .019" thick, the latter may vary a few thousandths of an inch either way.

Apparatus or machines heretofore devised for interleaving a stack of E plates upon a coil have not proven entirely satisfactory in operation with such plates, especially when they are of nonuniform thickness because they'sti-ck' and jam to such an extent as to require service for freeing them for a new start and, therefore, they are not well It is known that the most efiicient coil, havingthe'least energy leakage, is produced by interleaving individual plates in alternation in and to a coil. However, in many instances, 'efiiciency in the'finished coil is sacrificed for speed in production by interleaving more than one individual plate at a time, as for example two superposed plates and even as many asthree of such superposed plates at a time. This is termed in the industry as laminating or interleaving .double .or triple with E plates. The I plates are thereafter inserted ,double. .or triple.as'thei case may be and this is generally done by hand.

Core plates laminated in the fashion mentioned i. e. double or triple. can be laminated or interleaved with greater speed, but with a sacrifice in efficiency. However, due to the nonuniformity of thickness in E plates for reasons before mentioned, it is indeed difficult, if not impossible, to obtain uniformity in the finished coils either in structure, appearance or operating efliciency.

One of the objects of be present invention is to provide a method of and an apparatus forl'arninatinggcore plates inan interleaved relation upon a coil and which method simple and eflicient and which apparatus is of asimple; strong and rigid construction, fast and accurate in oper ation, and which will not be jammed and stopped by core plates which are over or under a predetermined thicknessor not perfectly flat. Q Another object of the invention is to provide apparatus; of this kind which operates to simultaneously interleave both E shaped and I shaped core plates, thus avoiding the necessity of applying the I'shapedcore plates as a hand operation. a Y

Also,,it is an object of the invention to provide an ap-1 paratus of this kind, wherein the core plates are applied to. the coil one after and under the other in successive alterna-w tions from opposite open ends of the coil, whereby the coil and assembled, platesqmove upwardly as a unit until the last core plate is applied in place. I

Again, it is an object of the invention to provide apparatus of this kind, which may be operated to interleave E and I plates jointly with respect to the coil Or to interleave E plates alone, either individually or in doubles? and triples. a

Furthermore, it is an object of the invention to provide apparatus of this kind that includesmeans for alternately removing plates from magazine stacks and to posia tion them upon a coil, which means, though reciprocating in character, isso constructed as to afford a uniform slow down to its minimum speed at each end of its stroke when. simultaneously selecting a plate from one stack, and.inserting another plate into the coil, and a uniform acceleration to its maximum speed between the ends of the.

stroke; 1

Another object of the invention is to provide apparatus of this kind wherein each plate, as it is removed from its stack, is moved in stages toward the coil, that is from a stack to a position between the stack and the coil, and then from said position into the coil, thereby afiording a better handling of the plates and a more even movement thereof.

Also,-it is an object of'the invention to provide apparatus of this kind which can carry out the improved method with accuracy and speed.

'The above mentioned objects of the invention, as well as others, together with the advantages thereof, will more fully appear as the specification proceeds.

In the drawings: s

Figure 1 is a top plan view of apparatus for applying laminations or core plates to a transformer coil embodying thepreferred form of the invention and capable of carrying out the improved method.

Fig. 2 is a longitudinal vertical sectional view through the apparatus shown in Fig. 1 as taken on the line 2-2- thereof. I

Fig. 3 is a perspective view ofa pair of standard. co acting E and I shaped core plates or laminae, in the relative position they occupy in connection with the coil of a transformer or the like, on a scale enlarged of that wherein they appear in Figs. 1 and 2.

Fig.4is a view partly in elevation and partly in horizontal section, on an enlarged scale, of those parts of the apparatus at the right hand end of Fig. l.

Fig. 5 is a view on an enlarged scale of those parts of the aparatus appearing at the right hand end ofFig. 2.

Figs. 6, 7 and 8 are transverse vertical sectional views through parts of the apparatus as taken on the lines 6 6, 7-7 and 8--8 respectively and on the scale of Fig. 5.

Fig. 9 'is another transverse vertical sectional view through a part'of the apparatus as taken on the line 9- -"9 of Fig. 2, on the scale of Figs. 6, 7 and 8 respectively, with Patented'JuIyIS,"1.958

Fig. 5, showing said parts when adjusted to select or pick a group of three plates from the magazine for simultaneous assembly upon the coil.

Fig. ll is a perspective view of a certain gate member associated with the I plate magazine at each end of the apparatus.

Referring now in detail to that embodiment of the invention illustrated in the accompanying drawings, and 16 indicate respectively the two upright elongated side frame members, each provided at the bottom with feet 1717 that are attached to a base plate 18 which appears only in Fig. 2. v

In the inner face of each side frame is a longitudinal groove 19 in which the lateral margins of a reciprocating plate 20 have sliding guided engagement. A suitable distance above each groove, each side frame is formed to provide an upwardly facing rail 21. At the central part of each rail 21 is a longitudinal rail portion 22 which is disposed at an elevation above the associated rail 21 and at its ends joins the same by short inclined surfaces 23 which best appear in Fig. 5 in dotted lines. This elevated rail portion has a length somewhat less than the axial length of the coil 24 to which the core plates are to be applied in the direction of the length of the opening 25 through the coil and which will be mentioned in more detail later on.

The plate 20 is provided at each end with a platform and between said platforms is an opening 31 of a length somewhat greater than either platform 30.

This plate has a reciprocating stroke in the operation of the machine and in this instance reciprocating motion is imparted thereto by means of the following construction. Fixed to the underside of the left hand platform, as viewed in Fig. 2, is a bar like connecting rod 35 which extends longitudinally from said platform. This rod, which is positioned substantially centrally between the frames 15 and 16, carries a cross head 36 at its outer end and in that face thereof facing the frame member 16 is a vertical groove 37. On that face of the associated end of the rod 35 facing the frame member 15 is a longitudinal rib 38 which has sliding guided engagement in a longitudinal groove 39 in the inner face of a boss 40 projecting inwardly from said frame member 15. On the inner face of the associated end of the frame member 16 is a boss 41 and journalled in this boss is a transversely extending shaft 42. A crank arm 43 is fixed to the inner end of said shaft and the free end thereof has a roller 44 journalled thereon which is operatively engaged in the groove 37 in the cross head 36.

On the outer end of the shaft 42 is fixed a pulley 45 (see Fig. 2) which may be driven in any suitable manner by a motor (not shown) and preferably disposed on the base 18. 1

The movement of the plate 20 is equivalent to the throw of the crank 43. The mechanism mentioned is of the dutch yoke type and it provides a uniform movement for said plate so that it decelerates evenly at each end of each stroke and accelerates evenly at the beginning of each new stroke, and attains its maximum acceleration midway between the ends of each stroke, the plate passing through zero motion in each reversal of its stroke. The crank arms 43 and associated parts are enclosed in a suitable casing 44, as best appears in Figs. 1 and 2.

In Fig. 3 is illustrated a pair of coacting sheet iron core plates and 51 r'especively which may be simultaneously applied to the coil 24 in the operation of the apparatus. The plate 50 is shaped like a conventional block-type capital letter E and the plate 51 is shaped like a conventional block-type capital letter I, and because of which said plates are known as E and 1 plates respectively. The E plate comprises a stem 50:: and end and intermediate strips 50b-50b and 50c respectively, the latter strips being of the same length and which is the length or depth of the coil 24 through its opening 25. The E plate is of such length as to ap- ,4. proximate the distance between the side frames 15 and 16 above the rails 21. The I plate is the same length as the E plate and it has the same width as the stem 50a of the E plate. Thus the plates 50 and 51 are designed to engage and be slid along the rails 21 and will not skew into a binding position when so slid along said rails.

Spaced longitudinally an equal distance from each open end of the coil 24, when it is in its operative position within the apparatus, are duplex magazines 55 and 56 respectively. As the structure of each magazine is the same, a description of one will sufiice for both. Each magazine includes upright side plates 57, the bottom end of which is so fixed to an associated side frame 15 and 16 that the inner faces thereof are spaced apart a distance equal to the length of the stem of the E plates as well as of the I plates. The inner face of each plate 57 is flush with the inner face of each side frame 1516 above the rails 21-21 thereof.

On the inside of each plate 57 there is secured an intermediate upright guide bar 58 which is capable ofa limited vertical adjustment thereon. In this respect each guide bar 58 has short vertical slots 59 therein and through which screws 60 extend from outside the plate for a threaded engagement in holes provided therefor in the guide bar. Spaced in each direction from said intermediate guide bar are parallel guide bars and 66 respectively. The bar 66 is spaced from the bar 58 a distance approximating the width of the parts 50b and 50c of the E plates 50 and the bar 65 is spaced from said bar 58 a distance equal to the width of the I plates 51. The bars 65 receive screws 60a that extend through slots 59a in the plate 57 (see Fig. 5) from the outside thereof in the manner mentioned in connection with the bars 58. Thus the bars 58 and 65 may be vertically adjusted on the side plates 57, to provide that space or opening between their bottom ends and the associated rails 21, which will permit the feeding of either one, two or three of the E and I plates at a time from each duplex magazine before mentioned.

The plates 57 in connection with the bars 58 and 65 and 66 respectively define upright channels 68 and 69 respectively, as best appears in Fig. 2, each to receive the ends of the E and I plates arranged in a stacked relation.

' When said plates are so stacked in the magazine, the

outer edges of the stems 50a of the E plates engage the bars 66 at opposite sides of apparatus.

On the inner face of the bottom end of each guide bar 58 of each magazine is a vertical groove 70 in which cngages with a sliding fit, the ends of the upright body 72 of a gate that appears in perspective in Fig. 11. At each end of the body is a right angled extension 73 and the corner where said extension 73 joins the body is rounded, as best appears in Fig. 10. Each extension is as wide as thechannels 69 of the associated magazine and in which said extensions have sliding bearing, so as' to have. a limited floating movement due to the engagement of the ends of the body 72 in the grooves 70.

On each end platform 30 of the reciprocating plate 20 is mounted both the I plate selector or picker member and the E plate selector or picker member, as well as the lifter members for said plates, as will soon appear.

These members are each indicated as a whole by the numerals 75, 76, 77 and 78 respectively. The members and 76 are of a transverse channel cross section and the member 75 includes a base 79 and upright longitudinal flanges 80 that are spaced apart laterally to line up centrally with the longitudinal spaces in the E plates between the strips 50b50c thereof. The inner end 81 of the flanges 80 of each member 75 constitutes the edge whereby both the E and I plates are fed from their intermediate position to the assembled position in the core. The outer end of the top edge of said flange has a recess 82 of a length approximating the width of the I plates therein to receiveI plates as the plate 20 moves toward the left from its position in Fig. 5, and under the associated stack of plates 51. The member 76 has upright side flanges 83 and the inner or front edges thereof extend above the rear end of the flanges 80 of the member 78 and defines an I plate selector point 84 that terminates above surface 82 of the member 75. The rear edges 85 of the flanges 83 are curved downwardly and outwardly to the rear end of the base flange and this surface provides lifting surfaces for the I plates on the back stroke of the plate. The flanges 83 of member 76 are in line with the flanges 80 of member 75.

The members 77 and 78 each include a base 86 and 87 respectively and upright laterally spaced side flanges 88 and 89. These flanges are spaced closer together than the flanges 80 and 83, as best appears in Fig. 4. The inner edge of the flanges 89 project above the outer edge of the flanges 88 and forms E plate selector or picker points 90. The top edge 91 of the flanges 89 curve downwardly toward the rear and constitute the edges which lift the E plates on the back stroke of the plate 20. That is, toward the associated magazine. The top edges 92 of the flanges 88 are curved downwardly and forwardly and the rear edge of this surface is disposed in a plane above the rail surfaces 21 a distance corresponding to the thickness of an E plate. Thus, after the plate 20 has completed its stroke to the right, as in Fig. 5, the rear margin of the stern of the bottommost E plate in the associated magazine, engages upon the rear end of the surfaces 92 of the flanges 88 and as the front end of said plates engage on the rail surfaces 21 the whole stack is tilted downwardly and forwardly and the rear edge of the stem of the bottommost E plate is engaged by the picker points 90 of the flanges 89.

All of the members 75, 76, 77 and 78 in each set are secured to the associated platform 30 of the plate 20 by means of screws 93 which best appear in dotted lines in Fig. 5. Assume now that it is desired to apply triple E and I plates to the coil 24 for each movement of the plate 20. The screws 91 for the members 76 and 78 are loosened and two shims S-S are disposed between the bases of these members and the associated platform 30 and the screws 93 are again tightened up. These shims are pieces of stock, the same as that of the E and' I plates and have holes therein for the passage of said screws. Said shims best appear in Fig. and it will be noted therefrom that the picker points 84 and 90 of the members 76 and 78 will pick off three of such E and I plates from each stack in the associated magazine and will carry them toward the coil as the plate moves to the left. Of course the bars 58 and 65 have to be adjusted upwardly to permit the triple plates to move thereunder and this is done by loosening the screws 60 and 60a and moving the bars upwardly as limited by the slots 59 and 59a.

Arranged between each magazine 55-56 and the elevated surface portions 22 of the rail surface 21 is mechanism for holding down the core plates fed to the inter-. mediate position. Each mechanism includes laterally spaced side arms 95-95 mounted for a limited rocking movement on a cross shaft 96 journalled in the frame members and 16 above the rail surfaces 21. These arms are disposed in the plane of said rail surfaces and that end thereof facing the coil 24 terminates in a presser point 97 that normally rides on the associated rail surfaces 21. A spring 98 surrounds the end part of the shaft 96 near each side arm and so engages the associated arm and part of the associated bar 65 as to yieldingly press the last mentioned end of said arms toward the rail surfaces 21. A cross shaft 99 connects one end of said arms together and centrally of the apparatus a duplex arm 100 is pivoted on said shaft. That end of said arms 100 facing the adjacent member 75 is made to provide a downwardly facing retainer hook 101, see Fig. 5, disposed substantially in the plane of the upright edges 81 of the flanges 80 of the associated member 75.

The other end of said arms are made as presser points 102 and these arms are cut away on their underside at 103 so as to pass over the cross shaft 96.-

A spring 104 surrounds that part of the shaft 96 between said duplex arms and the ends of said spring so engage parts of said arms 100, to either side of said shaft, as to yieldingly press the hook end 101 of said arm downwardly.

At the right hand end of the side frame member 15 is a reset counter 110 and a shaft 111 thereof carries an arm 112 so disposed that each time the plate 20 moves toward the right as in Figs. 2 and 5, it engages the arm and actuates the counter one stroke. After a run of the apparatus, to build up or interleave a predetermined number of E and I plates upon the coil 24, said counter stops the motor (before mentioned) which drives the pulley 45. By means of a key 113 the counter may be reset to zero for the next operation of the apparatus. Adjacent the counter are switch buttons 114 and 115 for stopping the motor and for starting the same at any poirit in building up the stack of E and I plates on the coil.

Assume that the operation of laminating or interleaving a stack of E and I plates upon or to a coil has been completed. The finished coil may then be lifted upwardly out of the apparatus. The operator then takes another coil in one hand and with the other hand places an associated E and I plate into each open end of said coil and then places the coil in position with the ends of the last applied E plate engaged upon the elevated rail surface portions 2222. This supports the coil in a pendent position with the major portions of the coil extending through the plate opening 31 and disposed below said plate. By pressing the proper button 114 and 115 the machine is started into operation, the plate 20 and members 75, 76, 78 and 79 on each platform 3030 reciprocating back and forth. When a coil laminating operation has been finished, there will. be an E plate with an I plate thereon left in an intermediate position, between the associated magazine and open end of the coil and these plates will be held against movement toward the associated magazine by the arms 95 and 100. In Fig. 5 the plate 20 is at the right hand end of its stroke. In the next started operation the plate 20 (toward the left) will move forward a distance equal to the throw of the crank 43 and this distance is considerably less than the distance between the coil 24 and the E plates in each magazine 5556.

As the plate moves toward the left with reference to Fig. 5, the picker points immediately pick up the bottom E plate in the stack in the magazine 56 and moves it toward the left and as the recesses 82 in the flanges 80 of the member 75 pass under the stack of I plates in said magazine, the bottom one thereof drops into said recess,

and is engaged by the picker points 84 of the member 76 and is carried along therewith.

It is to be noted that at the time the recess 82 reaches the stack of I plates, the bottommost one thereof rests upon the top edges of the flanges 80 of the member 75 and not upon the parts 73 of the associated gate 72. However, as the E plates reach the gate, the advancing edges of the E plate slides under the gate and lifts it upwardly to float in the grooves 70 in the bars 60 so as to pass the gate.

In this movement of the plate 20 toward the left, the edge 81 of the member 75, which is in engagement with the edge of the stem of the E plate in the intermediate position and the I plate thereon, pushes said E plate, which rests upon the rail surfaces 21 at this time, toward the associated open end of the coil 24, the advancing edge sliding under the points 97 of the arms which arms yield upwardly to permit this movement.

As the advancing edge of the E plate reaches the portions 23 of the rail surfaces 21, it. will slideupwardly "7 thereof onto the surface portion 22 of the rail surfaces 21, under the last applied pairof E and I plates and then lift the entire assembly of coil and plates a distance equal to the thickness of the E plate last entered into the stack.

In the movement of the Slide plate to the left, at the time one E plate is moved into position on the coil, the plates E and I removed from the stack are moved into the intermediate position. As said one of said E plates is moved into positionon the coil, the I plate carried thereby engages the end of the last E plate in place and is moved into a position upon the stem of the E plate just inserted.

In the next movement of the plate 24 toward the right the hook 101 of the arms 189 retains that E plate and I platewhich was moved to intermediate position, in that position. 7 7

It is to be understood that the parts 75, 76, 77 and 78 on the other end of the plate functions just as described above.

From the above it will be obvious that the coil 24 when positioned in place is supported from its upper portion and that the plates are applied to the coil, one after and under the other in successive alternation from its opposite open ends until the number of such plates, for which the counter has been set, have been assembled into interleaved relation upon the coil when the apparatus stops.

In the operation of the apparatus it is to be noted that the E and Iplates removed from a magazine in one stroke of the plates are moved into the intermediate position, as the plates previously in this position are moved into assembled relattion upon the coil. Thus, the interleaving of the plates is accomplished with a shorter stroke and whereby it is possible to use a shorter throw crank arm for reciprocating the plate 20. Therefore, it is not necessary to employ a long stroke'from the plate 20 with such a high speed of movement between the ends of the strokes, and which consumes more time so that it was not so fast in operation. i

If it is desired to apply only the E plates, to leave the insertion of I plates as hand operation, no I plates are placed in either magazine 55-456 and the apparatus will operate as before.

Also, if it is desired to apply the E and I plates as doubles and triples the apparatus may be adjusted therefor by the application of the shims as before mentioned.

' While in describing the invention I have referred in detail to the form, construction and and arrangement of the parts thereof, the same is to be considered in the illustrative sense only and therefore I do not wish to be limited thereto except as may be specifically set forth in the appended claims.

I claim:

1. The process of laminating core plates of two different shapes into assembled relation with an open-ended coil which comprises supporting an open-ended coil in a predetermined position, and cyclically repeating the steps of preassembling a first pair of core plates at a first location adjacent one open end of said coil by bringing said core plates together at said first location so that a core plate of one shape overlies a core plate of the other shape, said first location being spaced from the location of said first pair of core plates when they are in assembled relation with said coil, then moving said preassembled first pair of core plates from said first location into assembled relation with said coil While maintaining overlying relationship of said core plate of one shape with respect to the underlying core plate of the other shape so that the underlying core plate supports the overlying core plate, preassembling a second pair of core plates at a second location adjacent the opposite open end of said coil by bringing said second pair of core plates together at said second location so that a core plate of said one shape overlies a core plate of said other shape, said second location being spaced from the location of said second pair of core plates when they. are in assembled relation with said coil, and then moving said preassembled second pair of core plates from said second location into assembled relation with said coil and said first pair of core plates whilemaintaining overlying relationship of said core plate of said one shape with respect to the underlying core plate of said other shape so that the underlying core plate supports the overlying core plate, the underlying core plate of said first pair of core plates being at least partially superimposed on the underlying core plate of said second pair of. core plates wnen said respective pairs of core plates are in assembled relation with said coil.

2. The process of laminating core plates of two different shapes into assembled relation with an open-ended coil which comprises supporting an open-ended coil in a predetermined position, and cyclically repeating the steps of preassembling a first pair of core plates at a first location adjacent one open end of said coil, spaced from the location of said first pair of core plates when they are in assembled relation with said coil, by moving a core plate of a first shape past said first location in a direction toward said coil and placing a core plate of the second shape upon said first shape core plate as the latter moves past said first location so that a second shape core plate overlies a first shape core plate, then moving said preassembled first pair of core plates from said first location into assembled relation with said coil while maintaining overlying relation of said second shape core plate with respect to the underlying first shape core plate so that the underlying core plate supports the overlying core plate, preassembling a second pair of core plates at a second location adjacent the opposite open end of said coil, spaced from the location of said second pair of core plates when they are in assembled relation with said coil, by moving a core plate of said first shape past said second location toward said'coil and placing a core plate of said second shape upon said first shape core plate as the latter moves past said second location so that a second shape core plate overlies a first shape core plate, and then moving said preassembled second pair of core plates from said second location into assembled relation with said coil and said first pair of core plates while maintaining overlying relationship of said second shape core plate with respect to the underlying first shape core plate so that the underlying core plate supports the overlying core plate, the underlying core plate of said first pair of core plates being at least partially superimposed on the underlying core plate of said second pair of core plates when said respective pairs of core plates are in assembled relation with said coil.

3. The process of laminating core plates of two different shapes into assembled relation with an open-ended coil which comprises supporting an open-ended coil in a predetermined position, preassembling a first pair of core plates at a first location, spaced from the location of said first pair of core plates when they are in assembled relation with said coil, by bringing said core plates together at said first location so that a core plate of one shape overlie a core plate of the other shape, then moving said preassembled first pair of core plates from said first location to a second location intermediate said first location and the location of said first pair of core Plates when they are in assembled relation with said coil, preassembling a second pair of core plates at a third location, spaced from the location of said second pair of core plates when they are in assembled relation with said coil, by bringing said second pair of core plates together at said third location so that a core plate of said one shape overlies a core plate of said other shape, then moving said second pair of core plates from said third location to a fourth location intermediate said third location and the location of said second pair of core plates when they are in assembled relation with said coil, preassembling a third pair of core plates at said first location by bringing said third pair of core plates together at said first location so that a core plate of said one shape overlies a core plate of said other shape, simultaneously moving said preassembled third pair of core plates from said first location to said second location while moving said preassembled first pair of core plates from said second location into assembled relation with said coil, the overlying relationship of said core plates of said one shape with respect to the underlying core plates of said other shape being maintained during said simultaneous movement, preassembling a fourth pair of core plates at said third location by bringing said fourth pair of core plates together at said third location so that a core plate of said one shape overlies a core plate of said other shape, and simultaneously moving said preassembled fourth pair of core plates from said third location to said fourth location while moving said preassembled second pair of core plates from said fourth location into assembled relation with said coil and said first pair of core plates, the overlying relationship of said core plates of said one shape with respect to the underlying core plates of said second shape being maintained during said simultaneous movement, the underlying core plate of said first pair of core plates being at least partially superimposed on the underlying core plate of said second pair of core plates when said respective pairs of core plates are in assembled re lation with said coil.

4. The process of laminating core plates of two different shapes into assembled relation with an open-ended coil which comprises supporting an open-ended coil in a predetermined position, preassembling a first pair of core plates at a first location, spaced from the location of said first pair of core plates when they are in assembled relation with said coil, by moving a core plate of a first shape past said first location toward said coil and placing a core plate of the second shape upon said first shape core plate as the latter moves past said first location so that said second shape core plate overlies said first shape core plate, moving said preassembled first pair of core plates from said first location to a second location intermediate said first location and the location of said first pair of core plates when they are in assembled relation with said coil, preassembling a second pair of core plates at a third location, spaced from the location of said second pair of core plates when they are in assembled relation with said coil, by moving a first shape core plate past said third location toward said coil and placing a second shape core plate upon said first shape core plate as the latter moves past said third location so that said second shape core plate overlies said first shape plate,

moving said preassembled second pair of core plates from said third location to a fourth location intermediate said third location and the location of said second pair of core plates when they are in assembled relation with said coil, preassembling a third pair of core plates at said first location by moving a first shape core plate past said first location toward said coil and placing a second shape core plate upon said first shape core plate as the latter moves past said third location so that said second shape core plate overlies said first shape core plate, simultaneously moving said preassembled third pair of core plates from said first location to said second location while moving said preassembled first pair of core plates from said second location into assembled relation with said coil, the

overlying relationship of said second shape core plates with respect to the underlying first shape core plates being maintained during said simultaneous movement, preassembling a fourth pair of core plates at said third location by moving a first shape core plate past said third location toward said coil and placing a second shape core plate upon said first shape core plate as the latter moves past said third location so that a second shape core plate overlies said first shape core plate, and simultaneously moving said preassembled fourth pair of core plates from said third location to said fourth location while moving said preassembled second pair of core plates from said fourth location into assembled relation with said coil and said first pair of core plates, the overlying relationship of said second shape core plates with respect to the underlying first shape core plates being maintained during said simultaneous movement, and the underlying core plate of said first pair of core plates being at least partially superimposed on the underlying core plate of said second pair of core plates when said respective pairs of core plates are in assembled relation with said coil.

5. The process of laminating E-shaped core plates and I-shaped core plates into assembled interleaved relation with an open-ended coil which comprises supporting an open-ended coil in a predetermined position, preassembling a first I-plate and a first E-plate at a first location adjacent one open end of said coil, spaced from the location of said first I- and E-plates when they are in assembled relation with said coil, by bringing said first I- and E-plates together at said first location so that said first I-plate overlies said first E-plate, then moving said preassembled first I- and E-plates from said first location into assembled relation with said coil while maintaining overlying relationship of said first I-plate with respect to the underlying first E-plate so that the underlying E-plate supports the overlying I-plate, preassembling a second I-plate and a second E-plate at a second location adjacent the opposite open end of said coil, spaced from the location of said second I- and E-plates when they are in assembled relation with said core, by bringing said second I- and E-plates together at said second location so that said second I-plate overlies said second E-plate, and then moving said preassembled second I- and E- plates from said second location into assembled relation with said coil and said first I- and E-plates while maintaining overlying relationship of said second I-plate with respect to the underlying second E-plate so that the underlying E-plate supports the overlying I-plate, the underlying E-plate of the first pair of core plates being at least partially superimposed on the underlying E-plate of the second pair of core plates when the respective pairs of core plates are in assembled relation with said coil.

References Cited in the file of this patent UNITED STATES PATENTS 1,564,843 Fulton Dec. 8, 1925 1,966,878 Bluzat July 7, 1934 2,252,461 Franz Aug. 12, 1941 2,330,824 Granfield Oct. 5, 1943 2,494,349 Mittermaier Jan. 10, 1950

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