US1655997A

US1655997A - Winding- machine and process

Info

Publication number: US1655997A
Authority: US
Publication date: 1928-01-10
Anticipated expiration: 1945-01-10

Description

WINDING MACHINE AND PROCESS OF BENDING STRIP MATERIAL Jan. 10, 1928.

W. C. FURNAS WINDING MACHINE AND PROCESS OF BENDING STRIP MATERIAL Filed Jan.14. 1924 2 Sheets-Sheet 2 Paie-nad Jan, 1o, 192s.

UNITED STATES ra'rsu'r orifice..

WEILLIAM C. FURNAS, 0l? WEST ALLIS, "il/"ISCOlltlSllil',` ASSIGNOR '10 ALLIS-CHALMERS MANUFACTURNG CMPANSL', OF MILUVA'K'EE, WISONEIN, .A COBPORATON 0F DELAWARE.

WINDING MACEIINE .iiND PRGCESS F BENDING STRIP MATERIAL.

Application filed January 14, 1924:.

This invention relates in general to the art of metal bending, and has more particular relation to bendingr strip material edgeivise, as for the purpose of forming coils such as are of special utility as electromagnet `coils for dynamo-.electric machines and otherwise.- v

ln bending strip material, especially nia terial of large size, in an edgewise manner, there is a crowding over or enlargement of the material adjacent the inner edge of the bend anda tendency toward stretching or reduction of the thickness or crosssection of the material adjacent the outer edge of the bend. There it is necessary or desirable to preserve substantially uniform thickness of the material throughout, as is especially de sirable in the case of electromagnet coils formed from strip material bent or Wound edgevvise, this enlargement at the inner edge of the bend is a decided disadvantage, since it requires a further operation to reduce or reform the enlarged Wedge-shaped section usually a grinding, cutting or svvaging operation independent of the bending operation.

The crowdingr or enlarging, of the crosssection at the inner edge of the bent strip material is especially objectionable in electromagnet coils, especially field coils for dynamo-electric machines, for, unless removed, the over-alleine of such a coil is unduly increased. lt has been commercial practice in the past, in the formation of coils of large size, to first bend the material to form the complete coil and then separate the turns of the coil and to grind or swage the enlarnfcd portions at the inner edge of the bend of the individual turns successively, the individual turns being later pressed baclr into the desired coil formation of'as small axial dimension as possible. These op crations of reducingr to desired size the material at the inner edge of the bend and the subsequent reforming of' the coil are per formed at great expense and delay.

The present invention is related to and, as to features concerned with the bending and removal of excess thickness from a bent p0rtion of the material` constitutes an improvement upon the invention of the application of G. F. Johnston, Serial No. 685,946, filed January ill, i994.

Serial No. 685,945.

Features et the present invention contemplate the production of objects formed from bent strip material, especially objects formed from material of relatively great size as to thickness or Width, and wherein the excess thickness of material at the inner edge of bends is removed during,- the bending opera tion, this operation of removing the excess material beingdirectly associated with the opent-ion of bending the material, `and the operations being successive and continuous. A further feature of the invention conteur plates and includes an apparatus automatically operative to form bends, especially a series of bends as features of a coil., and to remove excess material from the inner edge `of the bends, the combined operations of bending and reducing; the bent or coiled material to the desired final shape being per formed at a. considerably reduced cost and in considerably less time than is required for the several operations of bending and trimming the material at the bend, as practiced in the past. v

An object of the present invention is to provide an improved method and apparatus especially adapted for producing;r bent strip material lwherein excess thickness formed at the inner side of the bend is reduced through an operation directly associated with the bending; operation.

It is a further object of the present invention to provide an improved method and apparatus especially adapted for the pro duction of objects formed from strip ma terial bent or coiled edgevvise and in accordance with which the material may be bent and all of the excess thickness at` the inner side of the bend may be reduced during the bending operation or a continuation thereof. It is a further object of this invention to provide an in'iproved apparatus for forminn edgewise wound coils, wherein the material to be Wound is fed to a rotatable form, and bending and cutting devices are operable simultaneously with and relative to the form for the purpose of bending;r the material and removingy therefrom excess thickness at the inner edge of the bent portions.

These and other objects and advantages are attained. by the present invention, various novel features of which will be apparent :from the description and draivincs herein,

disclosing an embodiment of the invention, and will be more particularly pointed out in the claims.

In the, accompanying drawings: Fig. lis a iront elevation of a coil Windin g apparatus embodying eaturesof the present invention;

Fig. 2 is a Vhorizontal section through the axis'of the machine as shown in Fig. l;

Fig. 3 is an end elevation of the apparatus of Fig. l

Y'resl'i'ectiveljy, of a clamping.deviceforining a further detail of the apparatus ot F ig. l; Figs. 9, l0, l1, and 12a-re diagrammatic views shovvinglthe relative positions et cooperative parts of the apparatus ot l, during thenori'nal operation ot such appa.-

- ratu's; and i Figui-13 is al diagrammatic view showing a detail of the control o'l' the apparatus ot y 1 Fig. l'.

. In accordance livith the disclosure ol" the drawings, a'frame or support l0 is provided With suitable bearings 'for a shaft 12 which Vhas keyed, or votherwise secured, to an end `thereof aV rotatable carrier or support lil, a

hub portion 14 of the latter bearing upon the shaftand constituting the means or' support and attachi'nent of the carrier to the shaft. Thehub portion le is rotatable Within a, stationai'ygear 15the latter being held against movement by means oian arm 16' secured to a hub portion of the gear anda rod l? attached to the outer end of the arni and to a fixed point of support, such as the traine fl0'. A forni 19 in the shape of an elongated spool about which strip Vmaterial is to be bent or Wound tok forniturns ot a coil of the type which may loe used for an elcctri'iina'gnet, such as the field coil of a dynamo-electric machine, is provided with asini-circular ends "2l about which the strip material is to be bent, andside portions having lflanges at their inner edges, these flanges constituting 'means forl attaching the form or supporting spool to the oiiteritace of 'the rotatable carrier 13.'

VpliiralityT of cli'slr-shaped elements oi' forming .blocks'25 are disposed at the ends oi' the arms ofthe rotatable carrier 13, with their axes in alinement with the axes of the semi-circular ends 2l of the forming spool. Each of these elements 25 is secured in position von the carrier b v means of bolts'26, and

`each has a rearwardly extending hub portion 27 ivhich fits Within an aperture in the rotatable carrier 13. shaft or pintle 28V is mounted in the axial bore of each hub portion 27 in the element 25, the shaft beingr provided with a head 29 occupying a eeni'rul countersunk recess 3l in the outer tace ol the element 25. The 'front end ot each shaft 28 is provided with an extension l2 upon which is mounted a spur gear 3ft. ldler `gears l5 are mounted upon shafts 3G which are passed through and mounted in operative position onthe rotatable carrier i3. The idler gears 35 constitute driving connections betvseen the stationary gear l5 and the spur gears 34. coaxial with the senil-circular ends 2l oli the supporting spool ll). rllhroiigh the arrangement of gears described, a planetariY grenidrive is provided of such design that each spur gear and its shaft is caused to iiialteI one revolution about their axis during iiy single revolution oil' the shaft 'l2 andy the rotatable carrier 13, the rotation ol" the earrier and the spool ll) carried thereby being anti-clockwise, as viewed. in Fig. l, and the rotation of the shafts 2S, which are driven through the rotation of the carrier, being.I` clockwise (all as indicated in Figs. Si, 1i), v1l and l2).

A section of strip material to be bent or Wound edgewise is indicated ai 40, 'it being intended that this material shall be bent or wound in such a manner as to iorni the several tuins of a coil ot the shape ot the forni i9 and such as mayv be used Ator an electroniagnet for the lield element ol a dynamo-electric machine, or otherwise. )is indicated in Fig. l, this strip material lll is bent around the semi-circular end 2l at the left of the forming spool, it being intended that the succeeding operation will bend such strip material around the send-circular end 2l at the right ot the forming spool.

The front face oit each of the disk-shaped elements or forming blocks 2l, is provided with a substantially circular recess all ha ving an inivardl)7 cut portion 45, the arrangement providing an annular shoulder Ll-( and an outer boundaryv wall fli', the latter being recessed at diametrically opposite points itl and 4f), as indicated, and the recess if) being extended at the leading side, considered with respect to the direction of rotation of the element 25. A dish-sli:ii ed head al the outer end ot each oi the shafts 2d servesl as ay tool holder. Mounted in a recess in the outer tace of the tool holder 5l is :i holder 52 for a cutting tool 53, t-lic liui` ot the cutting edge ot said tool being displaced 'troni and substai'itially parallel to a radius through the axis oit the shaft 28. The cutting edge of the tool 53 is displaced lroiii the i'roiil face of the disk-shaped element 25 h v means ot' an axial projection 54 on the latter element and with which the tool holder eooperates to maintain the desired space between the parts.

The tool holder is likewise provided with a ll l) lltl lill) Leanser insertion Within and removal troni the ro cess 56, the reduced extension Gil ot the shrunk portion passingy beneath the holder 52 :tor the cutting;1 tool, with the shoulder 64.- liniitino; the insertion ot the shank into the recess. The torniing tool 6l is provided with :i lat eral extension 6i", in a. recess in the lower tace of which a hardened Wearing plate GS is inounted. The outer end oit theshank portion 62 terminates in a hook-shaped portion 69. The plate 68 is maintained at such a distance from the center ot rotation ot the shalt 28 that it bears forcibly against the outer side ot the strip material to he Wound on the semi-circular end 2lA ot the forming spool i9; and it is through the forcible bearing ot the Wearing plate 68 against the edge oi'v the strip material that the latter is bent dur.' rotation of the forming tool about its anis. The shank portion 62 ot the torniingr tool is also provided With a rear extension 7l having a projection 72 thereon. When the tool holder is in operative position, the extension ll lits in the circular recess t3, with. the projection 72 in the under-cut recess do and engaging against the shoulder t6 to prevent WithdIaWal of the forming tool in an axial direction. Likewise, the engagement ot the projeetion 72 With the shoulder 416 limits the separation ot the inner side ot the shank portion from the `outer tace ot the eleinent Q5, this distance corresponding to the Width ot the strip material being Wound with alloivance for increasing thickness during; the bendingoperation. The tormingrtool 6l can readily be removed in a radial direction troni the operative position shovvn in Figs. 'l and 4t.

To appreciate the operation ot the process and apparatus, one can assume that the ini-` 'former at theleft in Fig. It, or that the strip material is otherwise held in position, and

r Y that the forming;` tool Gl has been inserted to operative position with respect to the shaft 28 and the portion ot the torni .lil at the right in Figs. 'l and 9.

lilindicates a. portion olf the strip material constituting a str: ight side ot the turn ot a coil beine' formed. In order to prevent dis tortion ot this straight portion of the turn duringr the succeedingV bendingr operation. a clamping device 75 is provided, the saine including a shank portion 76 rotatable in and readily insertible in and reinovable from an aperture in the boundary wall. i-.7 ol` theelcment at a point to the rearo't tlierecess i8 therein. This shank portion 76 is prorecess 7l" near its outer ene; and a clamping; block l having a recess provided with a curved *all closely engageable with that ot the recess 77, a pin 79 being provided to hold the clamping block in operative position in the recess. ills will he apparent from the drawings, roti yion ot the shank or stein 76, as by applyinga tool to the screw head thereolil will. cause the loiver straight clainpingr edge tl() ol the clamping` block to be reeiprocated to and troni toi-cible engagement with the odn'e ot' the straight portion 74e ot the coil turn. `When the claniping device is in operative position. 4as indicated, the straight sides ot the coil are prevented troni liulgring or distorting outwardly.

lill'ith the clamp l5 in operative engaging position and the torininp; tool. (il inserted to operativo position and held therein by the pin 6.3, as indicated in Figs, l. and 9, the nir-chine may be started. ln operation, the carrier lil rotates in an anticlockivise direc tion, and through the planetary drive, the torn'iing; lool til and the cuttingtool 53 are driven in a clockwise direction about their axis ot rotation. The operatingI eillect is that as thc carrier rotates troni theposition in* ilicatcd in Fig. t) to that indicated in l0, the lorniing tool 6l causes the strip material il() to be bent around the seiniecircular end 2l oit the forming block or spool; and when the carrier is in a position indicated in Fig. l0, the strip material el() has been bent through approximately 90 degrees. During the bende ing' operation described.l the thickness of the material has increased adjacent the inner edge thereof at the bent portion. Because of the forcible engagement between the shank of the bending; tool and the enlarged bent niaterial, and probably sonic holding action ot the cutting tool. 53 which 'follows the torining tool. substantially all oit this increase in thickness appears at the outer tace olf the bent strip material. J ust prior to the inoinent the parts have assumed thc positions indicated in Fig. l0, the cutting tool has started its cuttii'u;` or shavingoperation7 its ctlcct being to rcinove any prcriously lforined excess thickness at the bent portion and thus cause the thickness at the bent portion `to be uniform and ot the desired dimension. 'The cutting1 action is one oli shearing or shaving. as will be apparent 'troni lling il.. wherein tho action ot' the cutting lool 53 in removing; the portion 41037' lll) bend and, now being opposite the recess Li9, may beremoved from operative position so as to prevent distortion of the straight portion of thev coil side, as might be produced by further rotation of the forming tool relative to theformiiig spool. Accordingly, lthe forming tool 61 is withdrawn in a radial direction through ther recess A19. At this f timegthe recess t8 in the disk 25 at the right hand sidefot the forming spool 19, l in Fig. 11, is iii position wherein the forming tool 61 recentlyi'emoved from the disk 25 at the left, or' an additional forming tool (31,inay

V of the straight sided portion 7a of the coil, .Y ythis clamping device may be removed, as i indicated in Fig. 11.

. From they position indicated vin Fie. 11, rotationof thevcarrier plate 13 and its ap- Ypurtenant parts may be continued through the position of Fig. 12 and` to a positionV "corresponding to that of Fig. 9.

During ythis operation of the carrier 13 through 180 degrees, asecond semi-circular bend is produced in the strip material to form the opposite end of an oval-shaped'turn of the coil being formed. During this operation, a portion of this semi-circular bend has had its excess thickness reinoved from the inner edge thereof, the remainderof this excess material being removed as thecarrier is rotated Y furthenfrom the positionof Fig. 9 to that of Fig. 10.

y Y Due to the fact that the bending and cuttingtools rotate on their axis at the saine angular, speed as and in a direction opposite to the rotation of the carrier 13, the bending and cutting tools always extenl in the saine directions in space.

As each semi-circular bend is formed, the lower side of the bend, considering Fig. 11,

mayl inove outwardly or forwardly into proximity with the previously forn'ied turns, as the carrier rotates'to the position of Fig.

'12 and` slightly beyond, the cutting tool at this latter time having completed its cuttingV or shaving operation and occupying a position. within the formed portion of the coil, as may be seen at the right in Figs. 9 and 11, and hence not preventing this forward moveinent'of the coil side or the formed coil end.

Thus, it will be apparent that as the portions of they coil are completed they are free to move automatically or to be moved forwardly from the disk 25 so as to permit the formation of a succeeding bend or turn about the forming spool.

Y the clutch is released,

Leanser In order to insure a sufficient interval of time to provide for the removal of the forining tool G1 from one end of the carrier suhsequent to the completion of a seini-circul ar bend, and the insertion of this tool, or the insertion of another tool, at the opposite end of the forming spool, it is desirable to provide for the automatic stopping` of the apparatus when the bends are completed, at which time the recesses 49 and Li8 come into position to permit reinovalof one forming tool and the insertion of another forming tool.

As indicated in the drawings, Fig. 13, a. 'worm gear 8l operated by a worm 82 may serve as the operating drive for the shaft 12. The shaft 83 of the worin 82 is driven from a shaft 84; operated by a motor 85, directly or through a belt drive, as indicated, a clutch 86 being provided between the

shafts

82 and 83 the movable part of the clutch being pro- `vided with a pin 8T operating in a cam slot 89 of a clutch-operating element 91 having a guided reciprocating movement in a direction perpendicular to the axis of the shaft 83, the operating element 91 being normally biased by a spring 92 to a position wherein The clutch parts are held engaged to provide an operating drive for .the shaft 12, by reason of the fact that the operating element 91 is held in the position shown by a catch 93 which is flexibly connected to the clutch-operating element 9L through a liexible wire or the like 9-l passing over a sheave 94, the catch 93 being held by a latch 95, shown in Figs. 2 and 13 in the forni of a bell-crank lever and preferably provided with a. pin or roller 95" at that end which engages the catch This latch 95 is pivoted on a bracket carried by a stationary arm 9G carried bythe hub of the fixed gear 15, a spring 97 serving to bias the lever to latching position relative to the catch 93. An arm 98 is mounted on the shaft 12 for rotation therewith, extending in opposite diiections from the shaft, and is provided with operating portions 99 at diametrieally opposite points and in position to engage with and trip the latch 951 preferably through engagement with the pin or roller 95"l on the end of the latch, as the parts of the bending apparatus reach or pass beyond the position indicated in Fig. 13, the position of the pa rts in this figure being that assumwl just prior to reaching the positions of Figa 9 and ll. Releasing of the latch by he operating portion 99 of the arm. 98 permits the operating spring 92 to actuate the operating element91, thus releasing the clutch and causing the rotatable carrier 125 and its appurtenant parts to stop immediately due to its own load or, if necessary or desired. the additional load of an applied brake. The catch 93 is preferably mounted on a reciproeating rod 100 which is constrained to the desired straight line movement by suitable guides a theretor mounted on `the stationary arm 96.

The apparatus may be started again by applying.;` pressure to a treadle lOl, causing the catch 93 to be draven down and the preventing upward movement thereoiI and,

consequent release olf the clutch and the driving connection to the carrier 13.

ln ordeil to insure that no damage may be done to the coil being :toi-med, even though the operator Ytails toA remove the forming tool Gl as the latter reaches the position ot Fig. ll, an eye is suspended in position wherein its cross bar will be engaged by the hook portion G9 et the forming tool as the tool holder tends to rotate beyond the position of Fig. lll, the forming tool being suspended on the eye and ireeing and releasing itself from the element 25 as the latter continues its rotation, the enlargement ot the recess i9` tacilitating the removal of the bending tool.

ln the operation et the apparatus, it is preferable that sections oit strip material be ted from spools and joined together mechanically and electrically before being supplied to the bending apparatus, so that the operation oit the rotatable carrier 13, `with its forming spool and bending and cutting tools, may proceed untilthe requirednumber of turns are formed to complete the total number ot coils required. As the required number ot turns per coil are formed and moved Aloiwvard on the forming spool, the Wound material may be cut at the proper point to permit ren'ioval oit a completely formed coil ot the desired number ot turns.

Vilhile the invention has been described herein in connection with the formation of turns or coils otgenerally oval-shape with semi-circular bends, it will be apparent that 'features ot present invention may be utilized in the formation et coils ot any other shape, such as generally circular, triangular, lrectangular, with 360, and 90 degrees connecting bends, respectively, such coils being termed expeditiously when the bending tools are given the required operation as described and suggested herein.

lt will be apparent that, in accordance with the process and apparatus of the presont invention all excess thickness termed during the bendingor Windingoit strip material may be removed during the operation ot bending the material, and the final product may be a turn or a series et turns torining a coil .vherein the strip material is ot substantially the saine thickness throughout.

it should be understood that the inven- .A tion claimed is not limited to the enact details of construction and operation shown and described herein, tor obvious modications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent:

l; ln apparatus tor bending strip material, the combination of a forni, and means .tor accomplishingl a combined bending and tliiclniess-reducing operation on said material, said means and said torni being relatively movable, Vand said means being op erative during a continuous increment ot relative movement to form the desired bend about said rl'orm While permitting increase in thickness of the strip material at its inner edge during actual bending ot' such material and to reduce the excess thiol-:ness et said material at all portions tliereoi produced during such bending. j

2. In apparatus tor bending strip material, the combination of a term, and an element provided With a bending device and a thiclniess-reducing tool, said iorm and said element being relatively movable, said elementbeing operative during a continuous increment ot said relative movement to cause said bending device to bend said material about said term and to cause said thickness-reducing tool to remove excess thickness tormed during the bending thereof from all parts thereof adjacent the bent portion.

3. In apparatus for bending strip material about a form, means Yfor producing relative rotation between the form and the strip material to cause the latter to be bent to the desired shape While permitting increase in thickness ot the strip material at its inner edge during actual bending ot such material, and means operable during said bending operation and during a continuous increment o'l" saidV relative rotation tor re ducing excess thickness of all thickened parts adjacent the bent portion of said ma terial.

fl. lin apparatus for bending strip material about a form, means for producing relative rotation between the form and the strip material tocause the latter to be bent to the desired shape While permitting increase in thickness ot the strip material at its inner edge during actual bending of such material, and means rotatable during said bending operation and during a continuous increment ot said rotation for reducing all ot the excess thickness adjacent the bent portion ot said material.

5. In apparatus lor bending strip material, a rotatable carrier, a torni mounted on said carrier and about which strip material may be bent, and a bending element cooperative with said strip material. and operative to bend said material about said form during rotation of* said carrier, and means operative during the rotation of said carrier les izoV

for removing excess material from the bent portion of said strip material.

6. In apparatusffor bending strip material, a rotatable carrier,a form mounted on said carrier and about which strip material maybe bent, a bending element carried by andY rotatable'relative to said carrier and cooperative With said strip material to bend the latter about said yform during rotation of the carrienand means operative. during the rotationV of said carrier for removing eX- cess material'from the bent portion of said strip material.

In apparatus for bending strip mate` rial, a rotatable carrier, a form mounted on saidy carrier and about `Which strip Vmaterial may be bent', a bending element cooperative with said strip material and operative to bend said material about said'form during 'rotation ofsaid carrier, andmeans carried byand rotatable relative to said carrier during the operation of the latter for removing'excess thickness from the bent portion of said material.

SIn apparatus for bending strip lmaterial, a rota-table carrier, a form mounted on said carrier and aboutwhich strip material may be bent, a bending element carried by and rotatable relative to said carrier and cooperativefwvith said strip material to bend the "latter about said vform during rotation of the carrier, and means carried by and rotatablerelatifve toy said carrier during the operation of tlie'latter for removing excess thickness fromV the bent portion of said material.

"9. ln apparatus for bending strip mate rial Vinto a series of separate bent portions, a form, a bending` element cooperative with said material and adapted to bend the latter about said form, and means inherently op-V erative to remove Yfrom each Vbent portion the excess thickness thereof prior to the formation vof a succeeding bent portion of said material. c

10. vln'appara-t-us for bending strip material into ai series of separate bent pon tions, a carrier, a form mounted on said carriei', a Vbending element mounted on said form cooperative With said material to bend ythe latter about said form, and means inherently operative. to remove from leach bent portion of the .material the excess thickness thereof Vprior to the formation of a suc'c'ee'dingbent portion.

V'11. In apparatus Vfor bending stripmaterial into a series of separate bent portions, a/carrier, a form mounted on said carrier, a bending element mounted on said form and cooperative with said vmaterial to bend the latter about Vsaid form, and means inherently operative `to remove from each bent portion of the material the excess thiclrnesslthereof prior tti the formation of asucceedingfbent portion, said means conr ifetaeer prising a cutting tool rotatably mounted on said carrier.

12. In a machine for winding strip material edgeivise, a rotatable form about which material may be bent to form complete turns, a bending element cooperative with the material and rotatable about said form during rotation of the latter to cause the material to bent to the desired shape, and a tool rotatable relative to said form and adapted to remove excess thickness from the inner edge of the bent portion.

13. In a machine for winding strip ma terial edgeivise, arotatable form about which material may be bent to form complete turns, a bending element cooperative n'ith the material and rotatable about said fornito cause the material to be bent to the desired shape, and a tool rotatable in a di rection opposite to that of said form and adapted to remove excess thickness at the inner edge of the bent portions.

14. In a machine forwinding strip material edgewise, a form about which the material may be bent to form con/iplete turns, a bending element cooperative with the ma terial and rotatable about said form to cause bending of said material to the desired shape, and a cutting tool rotatable relative to said form and adapted to remove excess thickness formed at the inner edge of the bent portion of the material through a movement which is partly in continuation of the movement of said bending element, the cutting edge of said tool being at an angle to a radius through said cutting edge and thc center of rotation of said tool.

15. In a machine for Winding strip material edgeWise, a rotatable form about which material may be bent to form complete turns, a bending element cooperative with the material and rotatable about said form to cause the material to be bent to the desired shape, and a cutting tool rotatable in a direction opposite to that of said form and adapted to remove excess thickness at the inner edge of the bent portion, the cutting edge of said tool being rearwardly inclined.

16, In apparatus for Winding strip material edgewise, a rotatable non-circular form having spaced portions of arcuate contour, a. tool for bending said n'iatcrial about said forni during rotation of the latter, a thickness-reducing tool rotatable about an arcuate portion of said form, and a planetary gear drive connection between said form and said thiclmess-reducing tool to cause rotation of the latter relative to said form. said thicknessredueing tool being adapted to remove excess thickness at the inner edge of the portion of the material bent about said arcuate portion.

17. ln an apparatus for Winding strip material edgew'ise, a rotatable nonscircular lll) lim

form having spaced portions ot substantially bend the material about a semi-circular porcircularcontour, a bending tool cooperative With said material to bend the latter about said form, a cutting tool rotatable about the axis of a circular portion ot said term, and

a planetary gear drive connection between said form and said cuttingl and bending tools to cause rotation of the latter relative to said iorm, said cutting tool being` adapted to remove excess thickness at the inner edge of a port-ion ot the material bent about said circular portion of said form.

18. In a power-driven machine for bending strip material edgevvise, a rotatable carrier, a non-circular term carried thereby and having a plurality ot arcuate portions connected by substantially straight portions, a bending tool having a portion cooperative with the edge o't the material to be bent, a cut-ting tool cooperative with the bent por-- tion ot said material and adapted to remove excess thickness thereot during rotation et said carrier, `and a driving connection between said rotatable torni and said bending and cutting tools.

19. ln a machine for bending strip material, a rotatable form ot the desired shape ot bend, a bending tool cooperative with said material and adapted to bend the material about said form, a cutting tool adapted to remove excess thiclrness adjacent the inner edge ot' a bent portion of said material, means tor producing relative rotation between said bending` and cutting tools and said form, and means for insuring retention ot said bending tool in operative position during the bending operation and permitting removal ot saidtool only on completion ot said bending operation.`

20. An edgewise Winding machine, coinprising, a rotatable carrier, a torni mounted on said carrier and about Which strip material may be bent to form an edgewise 'Wound coil, and a bending element coopera tive with said strip material and operative to bend said material about said torni dui ing rotation of said carrier.

2l. In apparatus for forming coils ot' strip material, a rotatable support, a term mounted on vsaid support and rotatable relative to the strip material ted thereto, and a bending tool carried by said support and rotatable relative thereto and cooperative with said material during rotation ot said term to bend the material about said term.

22.1n apparatus for forming coils ot strip material, a rotatable support, a torni comprising straight portions connected by semtcircular ends mounted on said support and rotatable relative to the strip material ted thereto, and a bending tool carried by said support and rotatable relative thereto in an angularly opposite direction, said bending tool being` cooperative With said material during rotation ot said :torni to tion ot said torni.

23. ln apparatus for 'forming coils of strip material, a rotatable support, a form mounted on said supportand rotatable relative to the strip material ted thereto, and a bending tool carried by said support and rotatable relative thereto and cooperative with said material during rotation ot said i'orm to bend the material about said forni, the relative rotation ot said bending 'tool being in a direction opposite to that ot said support and at substantially the same speed as the latter.

rlhe combination in a Winding machine, oit a rotatable non-circular form of delinite shape, a bending tool, and means stantially coincident with the center o'tV curvatine ot the curved portion et said torni and cooperative with said strip material to bend the same about said curved portion during rotation ot said carrier.

2G. ln a machine tor Winding metallic strip material edgewise in the form ot a coil, a rotatable carrier, a torni mounted thereon and having a peripheral contour which is composed ot straight sections and curved sections, a removable device constituting a combined guide tor preventing buckling ot' said strip material and for bending said material about curved portions ot said form, and means lor rotating said device in direction opposite to that ot' said torni to cause the bending ot the strip material about a curved portion ot said form While permit` ting rendering said device inoperative during the laying ot straight portions ot a Wound coil.

27. ln a machine tor bending strip material, a rotatable torni oit the desired shape et bend, a bending tool cooperative with said material and adapted to bend the material about said term, means tor producing rela tive rotation between said bending tool and said torni, and means 'l'or insuring retention oi said bending tool in operative position during the bending operation while nermilting removal ot said tool on completion ot said bending operation.

fln a power-driven machine 'l'or Winding strip material edgewise, a rotatable carrier, a :torni carried thereby and having a curved portion, a bending tool cooperative rial about thev curved portion ot said form and mounted for rotation and axial adjusty ment with its airis of rotation substantially ioA concident With the center of curvature of said curved portion of theform, and a power connection between said carrier and saidbending tool to cause the latter to be rotated at an angular speed equal to that of said carrier and in a direction opposite to that of said carrier.

2 9. ln a machine for bending strip niate rial edgevvise, a rotatable carrier, a term cariied thereby and having a portion ot arcuate .contoui, a bending tool cooperative with the edge ofthe material to be bent, said bend- Y ing tool heingvi'otatable relatively to said form tocause lsaid material to be bent about said arcuate portion ot' the form, a power connection between said carrier and said bending tool to cause rotation ot the latter, and means for causing `stoppage ot' said carrier on completion of a bend.

30. In a machine tor bending strip material edgevvise, a rotatable carrier, a non-cin cular forni carried thereby and having a plurality of bent portions connect-cd by substantally straight portions, a bending tool'cooperative ywith the edge ot' the material to be bent,fsad bending tool being rotatable relatively to said form to cause said material t0 be bent about said form, a power connection between said carrier and said bending tool to cause rotation of the latter, and means for causing removal of said bending tool `trom-operative position upon the completion of a bend in said material.

SLln a power-driven machine for bending strip material edgewise, a rotatable car-` rier, a non-circular form carried thereby and having a plurality ot bent portions connected by substantially straight portions, a bending tool cooperative With the edge of the material to be bent and with a side thereof tovholdthe latter against an abutment, said bending tool being rotatable relatively to said form to cause said material to be bent about the torni, a povver connection from said carrier to said bending tool to cause rotation of the latter, means for insuring retention otsaid bending tool in operative position luntil the completion of a bend in said material While permitting removal of 'said tool upon completion ot' said bend, and

means for causingreinoval ot' said bending tool from ope V'ative position upon the coinplet-ion of said bend.

vaboutthe circular portion of said torni, a Vthiclmess.-reducing tool adapted to remore excess thickness from said material bent about said circular portion ot the form, said bending` and thickness-reducing tools being mounted ior rotation about the axis ot said circular portion of the l'orm, and means for rotating said tools at an angular speed equal to that of said carrier and in a direction opposite to that ot said carrier.

Y 33. ln apparatus for producing coils formed of strip material, a rotatable forni having portions ot' curved contour. and means associated with said iorin and rotatable relatively thereto and during rotation thereot' and adapted to reduce excess thickness of the overlying curved portions ot' the coil successively.

254i, lin a machine for Winding strip material, a rotatable torni, means i'or feeding material to and bending the same about said form, and means` continuously operiitive relative to and during the rotation of said forni and the operation oi `bending said material and adapted to remove excess thickness formed at the inner edge of the bent portion oi the material.

35. The combination of means tor bending and winding strip material edgewise at delinite inter vals whereby a coil of noncircular shape is produced, and means operating concurrently with the bending operation to maintain uniformity ot cross section throughout the material of the shaped coil, said latter means including a cutting tool adapted to shave all ot the excess thickness from the inner edge ot a bent portion oi the shaped coil through an operation which is continuous with the bending operation.

5G. The combination ot a non-circular coil form, a bending element movable peripherally abouti a portion oit said torni and adapted to dispose strip material in desired bent shape about said portion oit said forni, means for'teinporarily holding a portion ot said strip material in place, means for removing excess thickness from a bent portion ot said material in advance ot' a succeeding traverse of said bending element, and means for supporting formed and reduced turns ot said coil.

37. An improvement in the art ot `forming bent material subject to increase in thickness during the bending operation, which coniprises bending said material and removing by an operation continuous with the bending operation all ot' the excess thickness produced adjacent the bend during the bending operation.

88. Ain improven'ient in the ait of producing bent strip material subject to increase in thickness during the bending operation, which comprises bending said material While one tace thereof is forcibly held by a traveling element against an abutment, and removing through an operation which is continuous With the bending operation all of the excess thickness of the material prollll iii

duced at the opposite vtace thereof during the bending` operation.

39. An improvement in the art of pro# ducingcoils ot strip material subject to increase in thickness during the bending operation, which comprises bending` said inaterial about a torni to complete a turn and ren'ioving troni said bent material excess thickness at all thickened portions thereot' through an operation which is continuous with the bending` operation.

it fin iniijiroveinent in the art oi' producingl coils having,` a plurality of turns oit strip material bent edgewise and subject to' increase. in thickness dining; the bending operation, which comprises bending said material about a torni 'to eon'ipiete the turns successively, and removing` from one iaee olf the bent portions of said turns excess thickness troni allpoi.'tioiis thereof through an operation which is continuous `with the bendingl operatioii.

ll. ln a niaehiine tor bending strip inaterial edgewise.. a non-circular torni having a curved portion and rotatable about a single axis, a bending.; tool Cooperative with strip material to be bent, and ineans for rotating said bending tool about the curved portion of said form 'to cause said tool to bend said material to desired shape about said curved portion of the torni during rotation ot said Ytorni. I

412. in av machine for bending strip inaterial edgewise, a lforin having` a plureiity of arcuate portions connected by a substantially straight portion and rotatable about a single axis, a bending tool rota-table about an areuate portion of said torni and cooperative with the strip material to be bent, and means il'or rotating said beinlinp tool about said arcuate portion of said torni to bend said material to the shape olf' said arcuate portion during;v rotatioi'i ot said torni in a direction opposite to the direction ot rotation oi said bending tool.

in testimony whereof, the signature ot the inventor aiiied hereto.

W'ILLIAM C. FURNA t5.

CERTHMCATE CURRECWN Patent No, 1,655,997, Gran'z January MP, 1928, to

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