US1482592A

US1482592A - Machine for winding coils

Info

Publication number: US1482592A
Application number: US425317A
Authority: US
Inventors: Chester H Thordarson
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-11-20
Filing date: 1920-11-20
Publication date: 1924-02-05
Anticipated expiration: 1941-02-05

Description

Feb. 5

C. H. THORDARSON MACHINE FOR WINDING COILS Filed Nov. 20, 1920 5 Sheets-Sheet 1 Feb, 5 1924, 11,482,592

C. H. THORDARSON MACHINE FOR WINDING COILS Filed Nov. 20, 1920 5 Sheets-Sheet 2 Feb. 5 19240 C. H. THORDARSON MACHINE FOR WINDING c0ILs Filed Nov. 20. 1920 5 Sheets-Sheet 5 Feb. 5 1924.,

' C. H. THORDARSON MACHINE Fo'n WINDING GOILS Filed Nov. .20, 1920 5 Sheets-Sheet 5 Patent Feb. 5, 1924.

UETED STATES HAZE? CHESTER H. THORDARSON, OF CEllCAGO, ILLINOIS.

MACHINE FOR WINDING COILS.

Application filed November 20, 1920. Serial No. 425,317.

a resident'of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Machines for Winding Coils; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the vcharacters of reference marked thereon, which form apart of this specification.

This invention relates to improvements in machines for winding electric coils of that kind shown in my copending'ap lication for United States Letters Patent, erial Number 420,049, filed on the 27th day of October, 1920,, wherein the coils are of non-cylindric formation, being polygonal with outside an- 20 gles.

One otthe purposes of the invention is to produce a machine of this character in which the polysided coils can be wound on a rotating support to produce a coil struc- '25 ture having smooth, condense layers between its angles without a tendency to un wind. without the use of means applied to the wire after it has been wound on the coil.

Another object of "the invention is to provide a machine of this character in which wire to form the various turns of the coil are given a predetermined preset formation before being wound on the straight sides of the coil in such manner that the wire when laid in the coil tends to spring toward the center of the coil in a compact or condensed structure rather than to bulge away therefrom. o

Another object of the invention is to provide means for winding electrical coils, wherein a maximum number of turns can be wound in a given space.

Another object of the invention is to produce a machine of this character in which as the same driving or controlling unit of the machine can be used, with adjusting appliances, so as to wind wires of different gauges in the saine length'of coil, or to use the same controlling unit to wind wires of variable gauges in different lengths of coils.

Another object of the invention is toproof the mandrel and vide a novel switching and driving device for the endwise movable wire guide that is controlled by the bobbin rotating means.

Another object of the invention is to provide novel supporting means for bobbins to support the forming layers in such a way that a plurality of coils may be wound at once, and all placed under the control of the same controlling mechanism to properly W lay the wires on the forming coils.

Another object of the invention is to provide a novel form of bobbin adapted to be supported on a mandrel so arranged as to readily assemble thebobbins on a rotative mandrel or support and to readily remove them therefrom.

Other objects of the invention are to otherwise improve and simplify winding machines of the general character set forth, 7 and the invention consists in the combination and arrangement of the parts shown in the drawings and described in the specification, and is pointed out in the appended claims.

In the drawings:

Figure 1 is an end view of a coil winding machine embodying my invention.

Figure 2 is a side view thereof.

Figure 3 is a partial plan and partial sectional view of the controlling mechanism for controlling the feed of the wire to the bobbins and for driving the bobbin support.

1 Figure 4 is a vertical section on the line 44 of Figure 3. 95

Figure 5 is an enlarged section on the line 5-5 of Figure 2.

Figure 6 is a similar section of a lesser part of the construction shown in Figure.5, with parts in changed positions.

' Figure 7 is a detail section of some of the parts which are shown on line 77 of .Fi re 6.

igure 8 is a perspective detail' of a gib to be hereinafter described.

Figure 9 is a sectional detail on the line 9-9 of Figure 4.

Figure 10 is a side view,- with parts broken away,. of the mandrel with the bobbins-assembled thereon.

Figure 11 is a fragirif tary axial section 0 ins.

Figure 12 is a plan view of a broken away portion of two of the bobbins, the mandrel and inner support for the coil.

Figure 13 is a perspective view of one of the bobbins.

Figure 14 is a side view of one of the bobbins partially broken away, with a finished coil thereon.

Figure 15 is an end viewof the finished coil, showing the manner of collapsing the bobbin to remove the coil therefrom.

As shown inthe drawings, 10 designates the bed plate of the machine supported on standards 11. Rising from the bed plate is a frame 12 which carries the reels and guides for the wires. 13 designates a rotative mandrel on which are carried in endwise abutting relation bobbins 14 to receive the wire to form the coils, said mandrel be ing rotatively mounted at one end at 15 in the frame of the machine, and is reduced at its other end at 16 (Figure 3) to afford a driving connection with the controlling mechanism hereinafter to be described.

20, 21 designate parallel screws, one of which is connected to the reduced end of one of the mandrels, by' inserting said reduced end 16 of the mandrel into an axial socket of a coupling 22 (Figures 3 and 4) that is fixed to the screw 21, a pin 23 drivlng said mandrel from said coupling. Said screws are connected to be rotated in oppo site directions by toothed gears 24, on one" of which is mounted a driving pulley 25 which, in the present instance, is driven from a motor 26 through the medium of'reducing gears of any suitable nature, embracing the pulley 25.

The wire laying-on controlling

screws

20, 21 are supported in a suitable frame designated as a whole in Figures 1 and 2 by 27 arranged at the front left hand side of the machine, as shown, and suitably fastened thereto. Said frame, as shown best in Figures 3 and 4, embraces upstanding, inwardly facing

channel bars

30, 30, which are connected by a back plate 31 and by top bars 32, 32', respectively, and angle bars 33, to produce a rigid frame.

The said

screws

20, 21 are rotated at equal speeds and are rotatively mounted at their cndsin any suitable manner in the end plates ofthe frame." Located between said screws and alternately cooperating therewith is a double face nut 35 of the pitch of the screws, and of such pitch depth that when the threads at one side of the nut are meshed with one of the screws, the threads at the other side of the nut are demeshed from the other screw. The driving wheel 25 is constantly connected with the mandrel 13 directly through the screw 21, so that the mandrel will at all times rotate in the same di-- motion. The nut 35, however, constitutes ,a

' portion of a switch mechanism and it is so controlled to change the'direction of movement of the wire feeding devices, "hereinafter to be. described, so as to lay the wire first in one direction and t in the other along the axis of the forming coils, as will hereinafter appear. The said controlling or switch mechanism for thewire' feed or laying-on devices is so constructed that the ma? chine can be adapted to wind different gauges of wire in a coil or to windthe same auge of wire in longer or shorter coils.

his controlling mechanism is driven by the screws, one screw causing the feeding device to travel endwise in one direction to lay a layer on a coil and the other operating in the opposite direction, the controlling mechanism having means for shifting the nut first from one screw to the other. WVhen a complete layer has been wound on a bob- 'bin or forming coil, the wire laymg-on or guiding device will be reversed so as to lay on and Wind the next layer of the coil, while The said nut 35 is provided' with a hori-- zontal openings 38 (Figure 7 for the passage therethrough of a bar 39,-which-latter also extends between and is loosely connected at its outer ends at 39' to vertically swinging arms 40. Said arms lie adjacent to and are hinged at their lower ends at 41 to the end plates of the controller frame. Said swinging arms are attached at their pivots to the U-shaped arms of a bail-like member 42, which, in the complete machine, may be adapted to be connected to and operate a counting mechanism to count the turns 1n a coil, the counting means not being herein shown (Fi ure 4).

The said ar 39 is locked in the nut 35 by means of a lower fixed gib 43 WlllCll extends through the slotted opening 38 of the nut, through which the bar 39 extends, and is riveted thereto, and an upper movable gib 43' in said opening. the upper gib being adapted to be assembled in the opening, 1n-

terlockingit with: the nut 35. which affords lower closed part of the U-shaped fitting 46 has the form of a'blOck 44' that is laterally messes shouldered in its opposite sides for engagement with the lower end edges of the members 45, said members overlapping said block and being riveted or otherwise fixed there- 31 of the controller frame, as by means of a nut 48 which is threaded to the bolt and is forced toward the lower apertured end of the driving lever 45' through the intermediary of the lower end of a crank arm 50 that is pivoted on said bolt 47 and is fixed to swing with the driving lever 45'. The parts may be fixed together near their pivoted ends, as by rivets, and are spaced from the wall 31 of the controller frame b a spacing sleeve 51 which surrounds said olt 47. The crank arm 50 is offset laterally at 50' to space the principal parts of the lever and arm from each other. The arms of said U-shaped fitting are ta ered inwardly at their side ends and are Brought almost to points and are formed on their upper ends with upwardly opening notches 42 (Figure 7) to receive pivot pins 35 which extend across the slits 44 near their upper ends, but terminate short of the slotted opening 38 of said nut 39. The pin and slot connection between the nut and the U- shaped fitting provides means whereby the nut 35 may swingrelatively to said U-shaped' fitting and on an axis that is central relatively to the nut 35 and symmetrical to the relatively movable parts. The crank arm 50 is thus connected to the driving arm or lever 45, whereby swinging of the latter acts to swing said crank arm in a vertical plane.

The drivin lever 45 is resilient in a plane perpen icular to the plane in which it swings, so that the upper end of said driving lever, which carries the Urshaped fitting member 46, and which latter carries the double faced nut 35, can move towards and from the planes of the axes of the

shafts

20, 21 to permit engagementof the nut, with one screw and disengagement thereof from the other screw, as will hereinafter be described. The length of the driving lever and its resiliency admits of flexure of said lever with but little power applied to switch the nut from one driving screw' to the other. The resiliency of the driving lever is such, however, as to assist to hold the thread faces of the nuts firmly pressed against said screws. The swivel connection of the nut 35 with the driving lever facilitates adjustment of the threads of the nut to those of the screws, and avoids crossing of the threads. Said crank arm 50 is slotted, as indicated at 52, and is adapted to be connected to a horizontal sliding head 55 which is provided between its ends with oppositely extending guide bars 56 which extend through and have guiding engagement with bearing bushings 57 that'are secured to the side members 30 of the frame. The arrangement is such as to give horizontal movement to the sliding or cross head 55 through swinging movement of the crank arm 50.

The connection between the crank arm 50 and the cross head 55 embraces longitudinal slots in each said members. as shown in Figures 4 and 6 (the slot 52 of the crank arm 50 and a slot 55' in the cross head 55), and a connecting headed bolt 58 (Figures 4 and 9) that extends through the slots of said members and is threaded at one end to receive a-nut 59 which has an extension 59 that enters the slot of the member 50. Between "said members 50 and is a washer 60 that is formed with a reduced extension 61 which. extends through the slot in the member 55 and is surrounded by a bushing 62, the parts being arranged so that the extension will not turn in the slot of member 55 but will longitudinally slide therein. To this end "the extension 59 is sufliciently long to bear against one end of said washer 60, so as to leave room for the r to the bolt 58nvithout the parts binding.

The end of the extension of the bushing 62 bears against the head'of the nut, so that, by tightening the bolt, the parts are fixed securely together, with the extension of the nut 59 free to rock relatively to the crank 'arm 50 but with the extension 61 of the washer 60 capable of sliding in the slot of the cross head and to be locked thereto for adjustment, whereby-rocking movement of the crank arm imparts a direct horizontal movement to the head.

The cross head 55 carries at its upper end an upstanding ofi'set arm 64, the upper terminal 65 of which is twisted at a right angle to the main body of the arm to fit over the threaded end 66 of an endwise movable bar 67. Said arm is fixed to one end of said bar, as between clamping nuts 65 threaded to the reduced threaded end of said bar. Said bar 67 is supported and guided at its reduced cylindric ends between pairs of upper and

lower guide rollers

68, 68 that are rotatively supported on brackets 69 that are fixed in any suitable manner to the machine frame, as best shown in Figure 2.

The bar 67 is a wire directing or feed device, the intermediate portion of which is squared to receive, and to which are artached, spaced brackets 70 that are disposed above the squared portion mandrel 13 to correspond to the positions of the bobbins 14 thereon. The brackets 70 carry guiding as indicated in dotted lines in Figure 1', and in full lines in Figure 16, and the strands of wire \V which are tautly brought down over guide pulleys 75 from reels 76, both supported on said frame 12 first, under the guide pulleys 71 and thence over the prei'orming or wire layin pulleys 72 to carry the wire directly onto t 1e bobbins and forming coils. The bobbins 14 are shown in detail in Figures 1.0 to 14, inclusive. Each bobbin includes a rectangular box-like formation R0 of sheet metal, and they are arranged end to end on the mandrel 14. Each bobbin is split or divided at 78 on one of its fiat sides, and the tendency of the metal is to cause the bobbin formation to assume an expanded form, capable of being pressed together, due to the presence of the slot 78. (See Figure At one end of each bobbin, and disposed over each corner thereof is a longitudinally applied corner block 79, so arranged that when the bobbins are fitted on the squared portion of the mandrel 13, the sheet metal receiving portions 80 for the coils to be formed are those between the head formed by the corner pieces of one bobbin and the heads of adjacent bobbins, as indicatcd in Figures 10 and 11. The arrangement of the blocks 7 9 is such as to provide on each side of the bobbin structure, at its end, grooves 81, 82 with the grooves 81 lo- "ated on the oposite sides of the bobbin and adjacent to the sides at which are formed the grooves 8:2. The portions of the corner pieces on the side of the bobbins on which are formed the grooves 82 are transversely split or cut away at 83 for a purpose to be hereinafter described. The said corner pieces terminate short of each other on the walls 5 of the bobbin containing the grooves 81, and

in one of which the s t 78 is formed, in order that the bobbin structure may be collapsed by inward pressure applied to the corner pieces adjacent to the slot 78, so as to permit the coil structure C to be removed from the bobbin (Figure 15). I

In the operation of the machine, the bobbins are placed in endwise disposed position on the mandrel, in the manner shown in Figure 2. The wires W are threaded from their reels under and over' the guide and wire preforming rolls ,or discs 71, 72, and the terminals of said wires may be attached lo screws 85, as-shown in Figures 10,13, so as to afford means for anchoring said terminals and to enable the proper tension to be put upon the wires to guide them properly on the bobbins. Before the wires are threaded on the b0 bins, tapes 86 may be placed in those grooves of the bobbin heads between the corner pieces that aretrausversely slotted and thereafter suitable internal coil supporting forms 87 (Figures 12 and 14, can be wound in any suitable manner, not herein shown, about the shell ends of the bobbins to constitute inner supports for the coils when finished. Thereafter, the

machine is set in motion by starting the motor 26. The motor 26 drives the

screws

20, 21, the latter through the gears 24, 2 1. At, tl1is time the double threaded nut is meshed with one of the

screws

20, 21 to cause said nut to be moved in a. plane parallel to the direction of the axes of the screws. The mandrel 13 and bobbins are constantly driven in one direction, and the direction of the nuts travel depends upon which screw is driving the same. The travel of the nut, by reason of the fact that the upper end of the driving arm is connected thereto, through the swivelin connection described, causes the upper end of the driving arm or lever to travel in one direction, and through its connection, at the pivot bolt 17, with the crank arm and the connection of the latter with the cross head 55, causes the wire feeding and guiding device supporting bar to travel in the proper direction, so as to cause the wires to be laid on the bobbins side by side. The endwise travel of the wire feed and guides are so adjusted with respect to the rotative speed of the bobbin carrying mandrel that the turns of the layers will be laid closely side b side from end to end of the coils. There is provided means which are operative at the end of the throw of the bar 67 which trips the nut .35 so as to cause said nut to be switched from mesh with one driving

screw

20, 21, and into mesh with the other driving screw, thus reversing endwise travel of the bar 67 and causing the turns to be laid on the forming bobbins in the o posite direction. A practical means for e ecting this result is made as follows.

The nut 35 is provided at its upper end with a squared guide lug 90 which extends in overlap ing relation tp a vertical guide flange 96 igures, 4, 5 and 6) that is formed on a plate 97 that is bolted or otherwise secured to the intermediate top frame member 32. When said lug is engaged with the guide flange in travel, it causes one side of the nut to be held in mesh with one of said screws 20, 21-, and when the lug 90 reaches the end of the guide flange the resiliency of the driving arm 45 permits switching of the nut from threaded engagement with one shaft (20, 21) and thereby" changes the direction of travel of the direction and feed bar 67. It. may be stated thatdifferent length of the guide flange 96, it will be the other or reverse direction.

shifted past the adjacent end of said guide by the combined resiliency of the driving lever and a switch spring (98, 98') which.

lies obliquely with respect to the path of travel of the nut and which bears at its free end against said guide lug and is attached at its other end to a member 99 which can be adjusted along one of the top members 32 of the frame and is adapted to be clamped thereto by the set screw 101, shown in Figure 2. y reason of the fact that the nut is thus thrown over against the other screw, the direction of travel'of the nut will be reversed, so as to cause the wire feed and guiding device supporting bar to travel in The reverse travel of said bar will continue until said lug 90 has reached-the other endof the guide flange 96, whereupon a. similar switch spring (98, 98) on the other side. of the plane of the axis of the nut 35, and parallel to the other spring (98, 98) and which at this time bears at its free end against the lug 90, will cause the said nut to be shifted past said other end of the guide tla-nge. 96 and reverse the engagement of the nut with the screws and thus cause the feed and guide bar 67 to travel in the opposite direction. Alternatel switching (pf the moving nut .to demesh it fromone. screw and mesh it with the other screw causes the-turns of the coil to be wound in opposite directions until the coils are finished.

It will be noted that the switching spring (98, 98') are disposed in generally parallel relation obliquely across the machine, as in dicated in full and dotted lines in Figure 3. It also will be noted from an inspection of said figure that the lug 90 of the shifting nut is brought gradually into the influence of the ends of the curved terminal of said springs, and that, by reason of the long leverage of the nut mounting, due to the length of the resilient driving member 45,

' said nut is enabled to be shifted with little therefore, adapt the machine to winding different gauge wires in a coil of a given length and the same or" different gauge wires on different length bobbins Thereafter, the wires are cut above the guiding and laying on rolls and the bobbins can be removed from the mandrel, the inner terminal wires of the coils being suitably wound about the coils for attachment to the outer turns, Before the :bobbins aregre- ,moved, the tapes 86 may be cut by applylng a cutting knife through the slots 83 of the heads, and the free ends of said tapes, beyond the ends of the-coils, can be brought over the ends of the coil and be pasted to gether in overlapping relation, in the manner shown in Figure 14:.

It will be noted, therefore, that the length of travel of the switch actuated nut will be determined bythe length of the bobbin and the gauge of the wire wound thereon and also the length of the guide 96 for controlling the switch' movement of the nut. Therefore, guides of different lengths may be employed to control different lengths of travel of the nut. For instance, when Winding a longer bobbin with the same gauge of wire, it will be apparent that the length i of the controlling flange 96 for the switch nut need be longer than for a shorter.bobbin, and the travel of the bobbin per unit of rotation thereof will be maintained constant. Therefore, when winding wire of the same gauge on bobbins of different lengths, the connection between the crank arm ,50 and the cross head 55 will remain unchanged, the length of the nut guide flange being changed ,to vary the over-all travel of the nut on the screws. However, when it is desired to wind different gauges of wire on the same length of bobbin, it will be necessary to vary the rate of lineal travel of the wire guides relatively to the rotation of the bobbins in such manner that such rate of lineal travel will be greater when winding larger wire than when winding smaller wire. The means for producing the ,greater speed of linear travel of the wire J guides relatively to the bobbins when thus winding wire of larger gauge on the bobbins is efieeted by releasing the screw 58 and sliding it lengthwise in the slots in the crank arm 50 and cross head 55, so as to increase the rate of throw of the cross head with a constant speed of the nut which gives movement to the crank arm 50. Thus, by increasing the rate of lineal travel of the wire guideand laying on devices relatively to the speed of rotation of the bobbin mandrel, larger gauge wire which fills the longitudinal length of the bobbin is laid with its turns closely side by'side to fill the length of the bobbin. On the other hand, it will be obvious that if the wire is of considerably smaller gauge, it will be necessary to decrease the rate of lineal throw or stroke of the wire guide and laying on device holding bar. This adjustment may be very eifectually accomplished by increasing and decreasing the lever action of the crank arm 50 on the cross head 55. l

The nut '58 carries a pointer 58' that is adapted to cooperate with proper graduations on the outer face of the cross head, so as to enable the movement .to be set accurately with respect to the wire gauge and length of the bobbin. The varying radial thicknesses of coils due to the winding of one layer on the other for'all practical sizes of coils will vary so little as to be practically negligible in respect of a given adjustment or a given gauge or given length of bobbin and consequent coil.

From an inspection of Figure 1, it will be observed that the wires W, as they come from the guide reel 75, are first carried under guide discs 71 and thence over the laying on discs 72. The effect of thus training the wires over the two discs 71 and 72 is to give a preformation to the wires just before they go onto the coils, and in a direction to cause the turns to tend to spring towards the centers of the coils and to maintain this tendency so as to'prevent the wires uncoiling and prevent tendency of the wires bulging at the sides of the coil between the exterior angles thereof.

The turns of the coil may be wound very compactly so that a given number of turns may bemade to occupy a relatively small space, and the preformation of the wire. which enables the turns to be thus wound without pressure of any sort against them after passing onto the bobbin, enables the turns to maintain this compact formation. Thus, the turns of the coil do not tend to bulge and to enmesh or rub one on the other which, if it occurred. would have the effect to rub the insulation from the wire.

So far as the broader phase of the invention is concerned, the same effect of preforming the wire to cause it to tend toward the .center of the coil may be effected by less than one roll or disc, but the two discs are preferred because of a larger contact of the wire with the peripheries of the discs may be thus effected while at the same-time enabling the laying on disc to be brought closely to the bobbins and the forming coils thereon. This adjacency of the laying'on disc to the bobbins and forming coils avoids vibration of the wire between the second wire preforming disc and the bobbin or forming coil, so that reliability of winding the turns closely against each other in the coil is assured.

It will be understood that the structural details of the mechanism shown may be considerably varied within the scope of the claims hereto appended, and that the invention is not limited to the ilustrative embodi-' 2. In a winding machine for polysided COllS, a bobbin, means to support and rotate the bobbin, and laying on means for the coil to cause portions of the turns thatv subsequently lie between the coil angles to be preformed with a convex curved formation.

towards the center of the coil.

4.-. A winding machine for making polysided coils wlnch comprisea rotative support for a bobbin, and means for preforming the wire before its entrance to a coil wound on the bobbin to give the wire a tendency on the face of the coil between its angles to tend toward the coil'center.

5. Means to wind at polysided coil of wire in a manner to condense the parts of the turns on the straight sides of the coil, including means to support and rotate a polysided coil support, and means to preset said parts of the wire turns before they are laid on the straight sides of the coil to cause them to hug said straight sides.

6. Means to wind at polysided coil of wire in a manner to condense the parts of the turns on the straight sides of the coil between the angles thereof, including means to support a polysided coil support, and means to preset said parts of the wire turns before they are laid on the straight sides of the coil to cause them to hug said straightsides, said presetting means including a grooved guide to facilitate accurate feeding of the wire on the feeding coil.

7. A winding'maehine for polysided coils comprising a bobbin support with means for rotating it, and guide means to lay the wire on a bobbin, embracing means to cause it to travel in a direction parallel to the axis of the bobbin support in both directions and to reverse it at its limits of travel, and preforming means acting on the wire as it enters on the coil, for the purpose set forth.-

8. A winding machine for polysided coils comprising a bobbin support with means to rotate it, guide means for laying the wire on the bobbin embracing means to cause it to travel in a direction parallel to the-axis of the bobbin support in both directions and to'rev'erse it at its limits of travel, and means exterior to the coil support to preform the wire to cause it to approach the coil in a curve formation, with the convex side of the curve facing the coil.

9. A winding machine for polysided coils comprising a bobbin support. with means for rotating it, and guide means for guiding the wire onto a polysided bobbin embracing two discs over both which the Wire is re- ,comprising a bobbin support. with means for rotating it a wire laying-on guide support therefor which is adapted to move in a plane parallel to the axis of the bobbin support, means independent of the bobbin and the forming coil for preforming the wire as it is laid on the bobbin and forming coil to cause the wire to hug the straight sides of the coil and means controlled by the bobbin support rotating means for reversing the travel of the guide support.

12. A windingmachine for polysided coils comprising a bobbin support with means to rotate it, guide means for laying the wire on bobbins carried by said support embracing means to cause it to travel in a direction parallel to the axis of the bobbin support in both directions and to reverse it at its limits of travel, means exterior to the coil support to preform the wire to cause it to approach the coil in a curve formation, with the convex side of the curve facing the coil, and means for varying the throw of the guide support relatively to the rotative speed of the bobbin support.

13. A winding machine for coils comprising a rotative bobbin support, wire layingon guide support which is movable in a plane parallel to the axis of the bobbin support, means for reversing the travel ofthe guide, and means for varying the throw of the guide.

14. A winding machine for coils compris ing a rotative bobbin support, a wire layingon guide which is movable in a plane parallel to the axis of the bobbin support, means controlled] by the means for rotating the bobbin support for reversing the travel of the guide. and means for varying the throw of the guide.

15. A winding machine for coils comprising a bobbin support with means to rotate.

forming coil and means to cause the guide means to travel parallel to the axisof the bobbin support and to reverse the travel of said guide means.

16. A winding machine for polysided coils comprising a bobbin support with means to rotate it. a reel support for the wire. guide means between said reel support and bobbin support. and means to cause the guide means to travel parallel to the axis of the bobbin support and to reverse the travel of said guide means. said guide means exterior to and independent of a bobbin and forming coil on said support, embracing means to preform the wire before it is coiled onto the obbin. for the purpose set forth.

17. A winding machine for polysided coils comprising a bobbin support, polysided bobbins thereon with means to rotate said support. a supporting reel for the wire to be wound. wire guide means adjacent to the bobbin. and means to cause the same to travel in the direction of the axis of the bobbin support and to reverse the travel of said guide means, said guide means comprising peripherally grooved discs immediately adjacent to said bobbins over which the wire is trained for a substantial distance about its periphery.

18. A winding machine for polysided coils comprising a support for a bobbin, a poly sided bobbin supported thereon, with means to rotate said support, a supporting reel for the wire to be wound, and a pair of reversely rotated guiding and laying on discs adjacent to the bobbin, with the wire adapted to be trained reversely about the peripheries of both said discs. and means to cause said discs to travel in the direction of th axis of the bobbin suppoit and to be reversed in travel at predetermir ed intervals.

19. A winding machine for polysidcd coils comprising a rotttive bobbin mandrel, a polysided bobbin thereon, an endwise movable wire guide and support adjacent thereto, embracing means to preform the wire inde- 1pendent of and immediately before it is aid on, the bobbin and forming coil.

20. A winding machine for polysided coils comprising a rotative bobbin mandrel. an endwise movable wire guide and support adjacent thereto, embracing means to preform the wire immediately before it is laid on a bobbin and forming coil to cause the wire to hug the sides of the bobbin, and means to cause said guide support to travel endwise, combined with means toreverse its movement at predetermined lengths of travel.

21. A winding machine for polysided jacent thereto having means to guide and preform the wire immediately as it is being laid on the bobbins and forming coils to prebend zones of the wire length toward the fiat faces of the bobbin, means to cause said guide support to travel endwise,

combined with means to reverse its movement at predetermined lengths of travel.

22. A winding machine for poly'sided coils comprising a rotative bobbin mandrel .to support a series of bobbins, an endwise movable wire guide support adjacent thereto having means to guide and,preform the wire just before it is laid on the bobbins and forming coils. means to cause said guide support to travel. endwise, combined with means to reverse its movement at predeterminedlengths of travel, said guiding and preforming means embracing a pair of discs supported on said wire guide support over which the wire is reversely turned before it is laid onto the bobbins .and forming coils.

23. A coil winding machine comprising a bobbin support, a pair of parallel screws,

' one of which has driving connection to the support, with means to rotate the screws in I Z fig and having opposite directions, an oppositely facednut between and adapted to alternately mesh with said screws, switching means for switching said nut from one screw to the other, and means controlled by said nut for laying the wire on a bobbin on said support.

24. A coil winding machine comprising a bobbin mandrel, a wire guide adapted to travel adjacent thereto, a air of parallel screws, one of which has driving connection to said mandrel, with means to gear the screws to cause them to be rotated in oppoirections, a nut between said screws,

adapted to alternately mesh with said screws, means to switch said nut from .one screw to the other,and driving means for said wire guide connected to said nut.

25. A coil winding machine comprising a bobbin mandrel, a wire guide adapted to travel adjacent thereto, a pair of parallel screws, one of whichhas driving connection to saidfmandrel with means to gear the screws to cause t e to be rotated in opposi-te directions, a nt between said screws,

' and having oppositely facing threads Gil adapted. to alternately mesh with said screws, means to switch said nut from one screw to the other, driving means for said wire guide connected to said Iiilt and adj'ustable means forwaryi the length of 'traveljof said. nut in each" irection.

, 26.-' A coil winding machine comprising a bobbinsupport, a pair of parallel screws,

' one of which has driving connection'to the support, with means to gear the screws to rotate in opposite directions, a traveling nut between said screws and having oppositely facing threads adapted to alternately mes "with saidiscrews, switching. means at the ends of the nut travel for switching said nut from one screw to the other, and means controlled by the travel and reversal of saidv oppositely facing threads,

nut for laying a wire on a bobbin on said support. 27. A coil winding machine comprising a bobbin support, a pair of parallel screws, one of which has driving connection to the support, with means to gear the screws to rotate in opposite directions, a traveling nut between said screws and having oppositely facing threadsadapted to alternatel mesh with said screws, switching means at the ends of the nut travel for switching said nut from one screw to the other, means controlled by the travel and reversal of said nut for laying a wire on a bobbin on said support, and means for varying the rate of travel of the laying on guide independently of the rate of speed of rotation of thebobbinsupport. i

28. A coil, winding machine comprising gear'the screws torotate them in opposite directions, a nut between said screws having oppositely facing threads whereby the nut is caused to travel in one direction when engaged with one screw, and in another direction when engaged with the other screw, guiding and switching means for said nut, and a driving connection between said nut and said wire guiding and laying-on device.

29. A coilwinding machine comprising abobbin support, an endwise reversible wire guide and laying-on device movable parallel to said support, means. for rotating said bobbin support, and operative connections between said latter driving means and said guide and laying-on device, embracin means to reverse the travel of the guide and laying-on device.

30. A coil winding machine embracinga bobbin support, means to rotate it, a wire guide adjacent tothe support and movable in a direction parallel to the a'xis of the bobbin support,'mean.s to rotate said support in one direction, and means to cause the-wire guide to travel alternately in opposite directions.

3,1. A coil winding machine comprising a bobbin support, a wire guide and laying-on device movable in a plane parallel to the axis of said bobbin support, and controlling means to efl ect reversal and alternate direction of travel of-the guiding and laying-on device, embracing a swinging drivin'g member resilient in a direction perpendicular to its swinging plane, a slotted rock arm connected to said driving member at its pivot and swingable therewith, a slotted cross head connected, to said wire to the cross head.

32. A coil winding machine comprising I a bobbin support, a wire guide and layingiaeaaea on device movable in a plane parallel to the axis of said bobbin support, and controling-on device, embracing a swingmg driving member resilient in a direction perpendicular to its swinging plane, a slotted rock arm connected to said driving member at its pivot and swingable therewith, a slotted cross head connected to said wire guide, and means for connecting said arm to the cross head, said means being shiftablelongitudinally of the said slotted cross head and arm, with means for non-rotatively fastening it to said cross head, while permitting swinging movement of the arm relatively to the cross head.

33.-'A coil winding'machine comprising a bobbin support, a wire guide movable along said bobbin support, a controller member mova'ble alternately in opposite directions, with means for reversing it, a pivoted resilient driving member, having swiveling connection to said controlled member, and operative connections between i said driving member and said wire guide.

34:. A coil winding machine comprising a bobbin support, a wire guide movable along said bobbin support, a controller member movable alternately in opposite directions, w1th means for reversing it, a swinging driving member resilient in a directon at right angles to its swinging plane,

with means to loosely connectthe driving member to said controller member, operative connections between the driving member and said wire guide, and means controlled by extent of movement of said swinging driving member to vary the length of throw of the wire guide.

35. A coil winding machine comprising a bobbin support, a wire guide movable along said bobbin support, a controller mem- 'ber movable alternately in opposite directions, with means for reversing it, aswinging resilient driving member, a swivel connection between one end of said driving member and said controller member, a crank arm fixed to said driving member at its pivot, and a cross head connected to said crank arm and connected also to said wire guide support to operate the latter.

36. A coil winding machine comprising a bobbin. support, a wire guide movable alon said bobbin support, a controller mem er movable alternately in opposite directions, with means for reversing it, a swinging resilient driving member, a swivel connection between one end of said driving member and said controller member, a crank arm fixed to said driving member at its pivot, and a cross head connected to said crank arm and connected also to vsaid wire guide to operate the latter, said means for connecting the crank arm to said cross head embracing means to vary tilte-v lever arm of said crank arm relatively to the cross head.

37. A coil winding machine comprising a wire guiding and laying-on device, a slotted cross head connection for giving,end-= wise movement to said device, a swinging, slotted crank arm, controller and driving means for said crank arm, and a connection between said crdss head and crank arm embracing means extending into and movable along the slots of said arm and head and having means to clam it to said arm and head in different positlons of adjustment.

38. A coil winding machine comprising a wire guiding and layin '-on device,'a slotted cross head connection or giving motion to said device, a swinging, slotted crank arm,-

clamping means extending into the slots of said cross head and arm and adapted to be moved longitudinally of the latter to vary the lever age of said arm on the cross head, and means for giving swinging movement to said crank arm.

39. A coil winding machine comprising a wire guiding and laying-on device, a slotted cross head connection for givin Dl' motion to said device, a swinging, slotted crank arm, clamping means extending into the slotsv of said cross head and arm and adapted to be moved longitudinally of the latter to vary the levera e of said arm on the cross head, a contro ler for the crank arm embracing rotative, parallel screws, double face nut between them, with means for shifting thenut from one screw to the other, and vice versa, and a driving member fixed atone end to said crank arm and having a swivel connection at its other end to said nut,

40. ln a machine for the purpose set forth comprising a driving and controlling apparatus, embracing a cross head, a swinging lever arm connecting to and driving the cross head, a driving arm connected at one end to the crank arm for giving swinging movement to the latter, a pair of oppositely rotative screws, a double faced nut between them, adapted to be switched from one a screw to the other, and vice versa, said driving arm being resilient in a direction at right angles to the switching movement of the nut, and the nut being pivoted to the upper end of the arm.

4:1. in a machine for the purpose set forth comprising a. driving and controlling apparatus,

ing arm being resilient in a direction at embracing a cross head, a swinga ing lever arm connected to and driving the right angles to the switching movement of the nut and having at its end remote from its pivot a fitting that enters a slit in said nut, and a pivot pin carried by thenut and extending through an opening in said fittin 4%. In a machine for the vpurpose set forth comprising a driving and controlling v apparatus, embracing a cross head, a swinging lever arm connected to and driving the cross head, a driving arm connected at one end to the crank arm for giving swin ing movement to the latter, a pair of oppositely rotative screws, a double faced nut be- 15 tween them, adapted to be switched from one screw to the other, and vice versa, said in said nut, and a pivot pin carried by the nut and extending through openings in the fitting, said pivot opening of the fitting extending to the extreme ends of the latter to permit the driving arm and fitting to be bodily withdrawn from the nut.

In witness whereof I claim the foregoing as my invention, I hereunto append my signature this 20th day of October, 1920.

CHESTER H. THORDARSON.