US2029577A - Machine for winding electrical coils - Google Patents

Description

5 Feb. 4, 1936. I A. w. LE BOEUF 2,029,577

MACHINE FOR WINDING ELECTRICAL COILS Filed April 9, 1952 12 Sheets-Sheet 1 4M (2/. OZQW/ Feb."4, 1936. A. w. LE BOEUF 2,029,577

MACHINE FOR WINDING ELECTRICAL COILS Filed Aprii 9, 1932 12 she ts-sneet a Feb. 4, 1936.

A. w. LE BoEUF 1150mm: FOR wmfime ELECTRICAL COIL'S Filed AprilS, 19:52 12 snbet s sn'eet 4 Feb. 4,1936. I r A; L E Bogus I 2029577 MACHINE FOR WINDING ELECTRICAL COILS Filed April 9, 1952 12 Sheets-Swat 5 2a? Q X i 1;; I I6! W 7 71% 2 7%]! w i 2% o a? V I I w MWQZQZW I Feb. 4, 1936. A. w. u-: BOEUF 2,029,577

IMLHINE WINDING ELECTRICAL 001115 I Filed April 9, 1952 .12 Shets-Sheet 6 /Ziazawe .2

Feb-4', 1936. A. w. LEVBOEUF 7v I MACHINE FOR WINDING ELECTRICAL COILS Filed April 9, 19:52 12 Shets-Sheet '7 Feb. 4 1936. A. w. LE BOEUF MACHINE FOR WINDING ELECTRICAL COILS l2 Sheets-Sheet 8 Filed April 9, 1932 Feb. 4, 1936. A. w. LE BOEUF 2,029,577

MACHINE FOR WINDING ELECTRICAL COILS Filed Aprjl 9, 1932 12 Sheets-Sheet 9 Feb. 4, 1936. A. w. LE BOEUF ,0 9,577

MACHINE FOR wINbING ELECTRICAL COILS' l2 Sheets-Sheet 1O Filed April 9, 193 2 Feb. 4, l 936 A. w. LE BOEUF 2,029,577

MACHINE FOR WINDING ELECTRICAL GOILS Filed April 9, 1932 12 Sheets-Sheet ll jz ezzTor Patented Feb. 4, 1936 UNITED STATES PATENT OFFICE Arthur W. Le Boeuf, Cranston, R. I., assignor to Universal Winding Company, Boston, Mass, a corporation of Massachusetts Application April 9, 1932, Serial No. 604,293

17 Claims. (01. 242) This invention relates to improvements in winding machines and particularly to machines for winding electrical coils with sheets of paper or other insulating material inserted between the laylers of wire or other conductor forming the C01 In the following specification and claims the term coil is used in a broad sense to indicate any form of wound body'; the term wire" to designate all types of conductor; and the term paper" to apply to sheet insulation generally.

One object of the invention is to provide a machine of the type specified having automaticallyoperated means for inserting the sheets of paper into the coils at intervals during the winding to provide insulation between the layers of wire.

Another object of the invention is to provide means for supplying the paper or other insulating material from a continuous strip and for measuring and severing the strip in progressively increasing lengths in accordance with the increase in circumference of the coils being wound.

Another object-of the invention is to provide means for guiding the paper sheets into place on the coils to insure their proper overlying relationship with respect to the layers of wire.

Another object of the invention is to provide guiding and feeding means for thepaper or other insulating material which are adjustable for strips of diiierent widths as used in coils of varying dimensions.

Another object of the invention is to provide a sheet-serving apparatus of the type specified which will operate without wrinkling, buckling, skewing or otherwise mishandling the paper or other insulating material whereby to insure proper delivery of the same to the winding without constant attention on the part of the operator.

Another object of the invention is to provide a sheet-serving apparatus of the type specified which is ofsimple construction, positive in operation and procf against derangement or getting out of order.

Further objects of the improvement are set forth in the following specification which describes a preferred embodiment of the invention, by way of example, as illustrated by the accompanying drawings. In the drawings:

Fig. 1 is a front elevation of a coil-winding machine showing the general arrangement of the paper-feeding means in connection with the winding mechanism;

Fig. 2 is an enlarged general plan view of the sheet-serving mechanism showing its relation to the winding mandrel and wire-guides of the machine;

Fig. 3 is an end view of the same showing the delivery-mechanism in operative position during the transfer of the paper sheet to the coils being 5 wound;

Fig. 4 is a side elevation of the sheet-serving means partly in section illustrating the drawingoff, feeding and cutting mechanisms for the paper, and showing the positions of the correlated elements thereof during the delivery of the paper to the winding;

Fig. 5 is a similar part sectional view of the sheet-serving mechanism showing the position of the feed-elevating means at the start of the winding of the coils;

Fig. 6 is a similar part sectional view illustrating the strip-measuring mechanism for controlling the length of the sheet fed into the coils;

Fig. 7 is a part sectional view similar to Fig. 4 showing the position of the feed-rolls immediately following the feeding of the paper into the delivery shelf and illustrating the manner in which the feed-rolls are separated to permit the measuring bar to draw an additional length of paper therebetween;

Fig. 8 is a similar part sectional view showing the cutting-off mechanism which operates to sever the strip of paper immediately following the measuring operation;

Fig. 9 is a view similar to Fig. 5 illustrating the manner in which the feed-elevating means acts to raise the sheet of paper into position to be delivered to the windings at a constantly increasing height;

Fig. 10 is a side view of the elevation-control mechanism shown in the opposite position to that illustrated in Fig. 3;

Fig. 11 is an end view of the delivery mechanism shown in position to effect delivery of the paper sheet to the coils;

Fig. 12 is a detailed front view of the sheetserving means and cutting-off mechanism showing the delivery shelf broken away to illustrate the arrangement of the two cooperating knives for severing the strip of paper;

Fig. 13 is a detailed plan view of the camshaft and various cams and levers for actuatin the different mechanisms;

Fig. 14 is a detailed sectional view of the sheetdelivery mechanism and elevation-control means taken on line l4l4 of Fig. 3;

Fig. 15 is an enlarged fragmentary end view of the forward part of the sheet-serving means illustrating the manner in which the paper strip is fed by the feed-rolls into the delivery-shelf which is shown in section;

Fig. 16 is a similar enlarged view showing the paper-feed rolls as having separated to permit the strip to be freely drawn therethrough during the measuring operation and also showing the means for gripping and holding the end of the strip in place on the delivery shelf during the measuring oi. the same;

Fig. 17 is an end view of the adjustable coupling used for timing the sheet-serving mechanism in proper relation with respect to the winding mechanism; and

Fig. 18 is a chart graphically illustrating the path of movement oi! the various cooperating elements and indicatingthe sequence of operastructlon as that disclosed in my copending application for United States Letters Patent, Serial No. 560,839, filed September 2, 1931. As the present invention relates more particularly to an improved sheet-serving apparatus for use in connection with such a form of winding mechanism, the wire-coiling. mechanism is herein described only briefly as related thereto.

Referring to the drawings, the coil-winding mechanism herein illustrated comprises a bed or table 2 supported by legs 3 adapted to rest on the floor. Fixedly mounted at one end of the bed 2 is a headstock 4 carrying the journals for a rotatable winding-spindle 5. The spindle 5' carries a belt-pulley I which may be connected by means of a belt 8 to be driven from any suitable source of power such as an electric motor, not herein shown. At the opposite end of the winding-spindle 5 is a handwheel 9 which is also used as a brake-wheel to eifect prompt arrestment of the rotation of the spindle. This end of the spindle 5 carries a socketed chuck I l for connection with a winding-mandrel or arbor I5 on which one or a plurality of coils C may be wound, the opposite end of the mandrel being received in a similar chuck I2 supported in a tail-stock l3.

The strands of conductor or wire w are fed to the winding-mandrel l5 from above and caused to be traversed longitudinally of the axis thereof by means of reciprocating guides H. In the present type of machine a plurality of coils or elec tric windings are produced at one time by providing a series of the wire-guides II which are mounted in spaced relationship on a sliding carriage or'cross-head 20. The carriage or crosshead 20 is reciprocated from-a horizontal traverse-rod 22 which derives its motion from a heartshaped cam 23 keyed to a shaft 2|. The cam 23 is fast with a gear 24 which is driven from the winding-spindle 5 by gearing to be later described. A roll or follower 25 on a stud 30, carried by a block or slide 21, engages a groove 25 in the cam 23 and thereby imparts motion to the slide which is reciprocable on an inclined trackarm 28. A second roll on the forward end of the stud 30 engages in the slot 3| of a vertical arm 32 which is secured fast to the traverse-rod 22. The track-arm 28 is pivoted on the axis 2| of the cam 23 and is angularly adjustable along a fixed quadrant 33. By adjusting the angular position of the track-arm 28 the range or action of the slide'2l is regulated to control the extent of reciprocation of the arm 22 and rod 22 whereby to adjust the length oi throw of the wireguides II in accordance with the type of coils to be produced.

The traverse-mechanism of the winding-machine is connected to be driven from the windingspindle 5 through the means of gearing as next described. The spindle 5 carries a worm 35 which, as described in the copending application previously referred to, is releasably keyed thereto. This construction provides that the worm 35 may be disconnected from driving engagement with the spindle 5, whereby the operation of the wire-traversing and sheet-serving mechanisms may be temporarily arrested while the rotation of the winding-spindle is continued for the purpose explained in the application above referred to, For the purpose of the present description the worm 25 may be considered as normally fast with the spindle 5.

The worm I5 meshes with a worm-wheel 26 which is keyed to a stud-shaft 31 journaled in suitable bearings in a portion of the machine frame, The stud-shaft 31 extends through a gear-casing 38 and on its forward end carries a pinion 40 fast therewith. The pinion 40 meshes with a'spur-gear ll which is fast with a smaller gear 42 androtatable on a fixed stud 43 secured to an adjustable arm 44. The arm 44 is adjustable about the axis of the stud-shaft 21 to permit the use of change-gears in substitution for the gears 4| and 42. The gear 42 meshes directly with the large gear 24 which drives the cam 22 and thus motion is transmitted from the winding-spindle 5 to the cam to reciprocate the thread-guide in the manner as previously explained.

The manual starting and stopping of the machine is eflected through the use of instrumentalities described in the pending application above'referred to, and for automatically arresting the winding operation after a predetermined number of layers have been wound into the coils an automatic registering and counting device is provided, but not herein shown. This device forms the subject matter of a separate application, Serial No. 574,391, filed November 11, 1931.

Sheet-serving apparatus in generaL-The serving mechanism for inserting sheets of insulating material into the coil or coils being wound is constructed as a complete unit adapted for attachment to the rearward side '0! the coil-winding machine. As herein illustrated the serving attachment comprises, essentially, a pair of frame-members or brackets 55 and 56, see Figs. 2 and 4, which are attached to the rearward side of the bed 2 by means 01' bolts 51. The members 55 and 56 furnish supports or bearings for the various shafts of the mechanism to be later described. Extending between the frame- members 55 and 55 at their upper rearward ends is a brace or tie-rod 50. The rod 50 is secured to the members 55 and 56 by means of bolts 6| passed through holes in the members and screwed into threaded holes in the ends of the rod.

The frame-members 55 and 56 are also braced by means of an elongated strut or paper-guide member 52, the latter being secured between the members by means of bolts 53 and dowels 64, see Figs. 3 and 12. The frame-members are further joined together to form a rigid structure by variserving unit is thus rigid y supported to preventundue vibration.

As previously stated,the frame-members 55 and 56 constitute bearings for the various shafts and as herein shown hearings or journals 68 and 69 are formed therein fora rotatable cam-shaft 18. The cam-shaft l8 constitutes the main driving element for the several mechanisms and is driven. from the winding-spindle 5 through a train of gearing as next described.

It has been explained that the traverse-cam 28 is driven from the spindle 5 by gearing at a reduced rate of speed. Keyed to the traversecam shaft 2| is a relatively large spur-gear I2, see Fig. 1, which meshes with a smaller spursgear I3 rotatably mounted on a stud-shaft 14 held in a bracket I5. The gear 13 is fast with a bevelgear 16 which meshes with a similar bevel-gear 11 fast on a shaft 18 journaled in a bearing 19 formed as a. part of the bracket 15. At its opposite end, the shaft l8 carries a coupling member 88 which is joined to a similar member 8| fast on the end of the cam-shaft 18 by means of bolts 82, see Fig. 1. Referring now to Fig. 1'7, the coupling member 88 is provided with three equally spaced arcuate slots 88 while the member 8| is formed with four similar slots 84. By this means the shafts 18 and 18 may be rotatively adjusted with respect 'to each other to obtain the proper relationship and then bolted together with the bolts oppositely positioned one hundred and eighty degrees apart.

It is essential that the operation of the sheetfeeding or serving mechanism be properly timed with respect to the traversing of the wire. That is to say, the delivery of each sheet to the coils must take place at the instant that the wireguides reach their extreme extent of traverse in either direction. To attain this proper timing of the mechanisms the coupling members 88 and 8| are rotatively adjusted relatively of each other and the bolts 82 tightened to clamp them together to rigidly join their shafts I8 and 18 as a unit. The gears I2 and 13 have a rato of 2 to 1 to provide that the cam-shaft 18 will make one complete revolution during a half revolution of the traverse-cam shaft 2| so that the delivery of the sheet to the coils will take place at the end of each complete traverseof the wire in either direction.

Paper supply mechanism.--Referring to Figs. 2 and 4 of the drawings, a roll R of paper or other insulating material is rotatably mounted on a rod 88 removably supported between the rearward extensions 59 of the frame-members 55 and 56. The roll R is placed on the rod 88 so that its central tube T rests on the tapered sides of one of a pair of frusto-conically shaped collars 89 fixedly mounted on the rod. A similar collar 89 is then slid onto the opposite end of the rod to enter the other end of the tube T. The collars 89 are secured in place by set-screws or other suitable means and thereby the roll R is held rotatively with the rod 88. Adjustable collars 98 secured to the extremities of the rod 88 abutting the outer sides of the frames 55 and 56 take the thrust in either direction and maintain the paper strip in central position with respect to the feed mechan sm. 1

The end of the paper strip S is drawn off from the roll R and passed around movable rollers 94, to be later described, and thence upwardly and over the tie-rod 68. The strip S is then drawn over a plate-like shelf 9| extending across the top of and fastened to the frame-members 55 and 56. The plate,9| may be constructed from a strip of sheet-metal with end portions 92 bent downwardly at right-angles to its main portion to pro- I vide smooth comers so that the paper will not be torn or otherwise damaged during its travel thereacross. From the plate or shelf 9|, the paper passes between a pair of feed-rollers I I5 and I25 which feed the paper onto a deliveryshelf 225 in the manner as later explained.

The paper strip is drawn off from the roll R during that part of the cycle of operations of the machine as graphically indicated in the chart (Fig. 18), this feeding operation being accomplished by instrumentalities to be next'described.

Referring to Fig. 4, the rollers 94, before menlicned, are rotatably mounted on a rod 95 secured to the end of a rockable supply-lever 96. The lever 95 is rockably mounted on a pivot-rod 97 extending between the side-frames 55 and 56 and secured in bosses thereof by means of tapered pins I82, see Fig. 13. Spaced at a short distance from its pivot, the lever 96 carries a headed pin 98 on which is rotatably mounted a roll or follower 99 adapted to engage the periphery of an eccentric disk-cam I88 fast on the cam-shaft 18.

The supply-lever 96 is held with its roll or follow'er99 bearing against the edge of the cam |88 by mcans of a helical spring |84 surrounding the rod 91, one end of the spring passing through a hole in the lever and the opposite end inserted into a similar hole in a fixed collar I on the rod 91, see Figs. 1 and 13. The spring I84 also serves to maintain the hub of the lever 96 in position abutting the side of'a collar I86 fast on the rod 91.

The supply-control cam I88 and the lever 96 actuated thereby are shown in initial position in Fig. 4, that is, during that part of the cycle of operations as indicated at a--a in Fig. 18.

With the parts in this relationship the rolls 98 I are d: pressed to apprcx'mafely three-quarters of a complete working stroke. During this stroke the rolls 94 engage the loopof paper strip S and pull downwardly thereon to draw a length from the roll R. When in its lowermost position, as

illustratedby dotted lines in Fig. 4, the loop of paper is completely formed. A further rotative movement of the cam I88 permits the follower 99 to ride upwardly whereby the lever 96 and the rolls 94 gradually rise to their uppermost inoper ative position as indicated by dash lines in this view. While in this position the loop of paper S is free to be drawn upwardly by the feed-rolls H5 and |25 in the manner as later explained. To provide tension on the suspended length of paper a weight in the form of a cylindrical rod |8| may be placed within the loop to keep the strip taut during its feeding movement.

To prevent the strip S from being drawn rearwardly across the plate 9| and rod 68, a pair of weightcd grippers or retaner-eiements in the form of eccentrically-mounted disks positioned at the ends of the lie-rod 68 act to check any backward pull upon the strip while it is being drawn off from the roll R as the lever 96 descends. The

retainers III are mounted on arms or bracket I66 adjustably secured to the tie-rod 66 adjacent the edges of the paper strip 8. The arms I66 carry pins or studs H6 at their outer ends upon which the disks III are eccentrically mounted, and, preferably, the peripheries of the disks are covered with suitable rubber bands to provide frictional resistance to the paper strip passing thereunder. It will be understood by reference to Fig. 4 that the disks III offer no resistance to the strip S as it passes over the rod 66 in its travel to the feeding means. On the other hand, as the rolls 64 are lowered to draw oi! a length of paper from the roll R. the disks I I I bear against the marginal edges of the strip to bind it against the rod 66 and prevent retrogressive movement thereof. The arms I66 may be loosened and ad- Justed along the rod 66 to set the grippers or retainer elements I II in proper relationship for strips of different widths.

Strip-feeding mama-In general, the stripfeeding means comprises a pair of opposed rollers I I6 and I between which the strip passes. The rollers are adapted to be rotated to feed the strip therethrough during a relatively short interval of the cycle of operations as indicated in Fig. 18. Means are provided for swin ing one of the rolls away from the other roll after completion of the feeding operation to release the strip so that it may be drawn freely forwardly by a measuring device to be later described.

Referring particularly to Figs. 2, 4, "I, 15 and 16, the lower roll H5 is rotatably mounted between the frame-members 65 and 66 in suitable bearings provided'for this purpose. The roll I I6 comprises an elongated cylindrical body with reduced end portions or trunnions II6 by means of which it is mounted in its bearings adjacent the horizontal strut 62, previously described. The circumference of the roll H6 is provided with annular grooves III into which project extensions or fingers II6 of a paper-guide formed as a plate I26 fastened in a recess H6 in the inclined top of the strut or rest 62 by screws I2I. The purpose of the guide I26 is to guide the paper strip upwardly across the top of the strut or rest 62 as it leaves the feed-rolls, see Figs. 15 and 16.

Spaced slightly above the top of the rest 62 by means of thin plates or shims I42 is an upper guide-plate I53 secured in place by means of screws passing through the plate and its shims and screwed into the rest. The plate I53 is provided with slots I6I, see Figs. 2 and 16, and projecting upwardly therethrough is a pair of edgeguide screws I66. The paper strip S-passes between the sides of the heads I61 of the screws I66 and. is thereby guided laterally across the rest 62.

It will be observed by reference to Figs. 15 and 16 that the recess II6 formed in the upper face of the rest 62 is extended laterally with its side beveled upwardly to meet the upper inclined surface of the rest. The screw-heads I6! are similarly beveled to provide that they may be slid therealong while being held from turning. The heads I61 01' the screws I66 are clamped against the under side of the plate I53 by means of slotted thumb-nuts I66 which are screwed onto the upwardly extending threaded ends of the screws to secure them in adjusted relationship. Referring to Fig. 2, the sides of the screw-heads I61 act to guide the edges of the strip S'as it is fed across the rest 62. By loosening the nuts I66 and sliding the screws I66 in the slots I6I of the plate I53 they may be adjusted to accommodate strips of varying widths. I

Secured to the end of the lower feed-roll H6 in any suitable manner is a small spur-gear I23 which meshes with a similar gear I26 fast with the upper feed-roll I26. The top roll I25 is rotatably mounted at the ends of a pair of arms I21 and I26 which are fast on a shaft I26 extending through bearings I36 on the frame- members 55 and 66. One arm I2! is formed with an upstanding lug I32, see Fig. 7, through which is threaded an adjustable limiting screw I33. A lifter-lever I62 pivoted on the cross-shaft I26 is formed with a lug I66 adapted to engage the end of the screw I33 to rock the arm I21 to raise the top roll I25 away from the lower roll II5 in the mannerand for the purpose as later explained.

The end of the shaft I26 extends beyond the bearing I36 on the frame-member 55 and carries a collar I34 fast therewith. A spring I35 is coiled about the shaft I26 between the bearing I36 and collar I34, one of its ends being held within a hole in the side of the collar while its opposite end is bent at right-angles to overlie the top of the frame-member 55, see Figs. 2 and 7. The spring I36 tends to rotate the shaft I26 in a counter-clockwise direction to maintain the top roll I25 in peripheral engagement with the bottom roll I I5 until the former is raised by the lifter-lever I62, previously mentioned.

As above described, the bottom and top rolls I I5 and I25 carry spur-gears I23 and I26, respectively, of the same pitch-diameter which is equal to the diameter ofthe outer peripheries of the rolls so that when the latter are in contact the teeth of the gears properly intermesh. Furthermore, the movement of the top roll away from the bottom roll is very slight, only a few thousandths of an inch, so that the gear-teeth will not be disengaged. The gears I23 and I26 are intermittently rotated to-feed the paper strip by means as next described. The gear I23 on the roll II5 meshes with an idler gear I31 which is journaled on a stud I36 fast in the frame 66 and the latter gear meshes with a larger driving gear I46 journaled on a similar stud I in the frame. The gear I46 is periodically rotated throughout a part of a revolution by means of a ratchet-mechanism arranged as now described.

A slotted arm I43 pivoted on the stud I4I adjacent the side of the gear I 46 carries a pin I44 at its outer end on which is pivoted a pawl I46 adapted to engage with the teeth of the gear I46. A spring I46 maintains the end of the pawl I46 in engagement with the teeth of the gear I46, one end of the spring being hooked to a pin on the pawl and the opposite end looped through a hole in the arm I43. The pawl I45 is moved upwardly to turn the ratchet-gear I46 and thereby the rolls H6 and I26 by means of a connecting rod I64 which derives motion from a feed-cam I46 fast on the shaft 16, previously referred to.

Pivoted on a fulcrum-rod I46 extending through the frame-members 65 and 66 is a feedlever I56. The lever I66 carries a pin I6I at its free end upon which is rotatably held a roll or follower I52 engaging the edge of the cam I46,

whereby the lever I66 is periodically raised and adjustable in length and for this purpose may be constructed as next described. The main part of the link I54 is adjustably connected to the arm I43 by means of a bolt I55 engaging a slot I58 in the arm. At its lower end the link I54 is threaded to a turnbuckle I51 and the turnbuckle, in turn, is threaded to a bolt I56 connected to the stud I5I at the end of the arm I50. Through this arrangement the length of the connecting rod may be varied to adjust the range of movement of the pawl I45. To provide for the adjustment of the connecting rod on the arm I43 the stud I55 has a square head which is slidable in the slot I58 to be moved toward or away from the axis of the gear I40 and secured in place by a nut. A spring I59 tends to swing the arm I43 downwardly to maintain the roll-l52 against the edge of the cam I48, the spring being attached to the pawl pivot-pin I44 and anchored to the machine frame 55 at I60, see Fig. 4.

The lifter-lever I62, previously referred to as pivoted on the rod I29 and operative to raise the top feed-roll I25, is arranged with the lower end of its arm I63 normally bearing against the hub of the pawl-arm I43. A set-screw I64 adjustable in the arm I63 is adapted to be engaged by an angular shoulder I41 on the arm I43 as the latter is raised under the impulse of the feed-cam I48. This engagement rocks the lever I62 to separate the feed-rolls in the manner as previously explained.

' Strip-measuring mechanism-The stripmeasuring mechanism comprises a horizontally extending bar or rod I10 which is positioned forwardly of the rest 62 and adapted to be lowered to pull downwardly on the paper strip to form a loop between the delivery-shelf and the rest. The length of this loop is governed by the circumference of the coil or coils being wound at the time the sheet is to be served thereto. As the circumference of the coil constantly increases in length with the growth of the winding, the

length of the strip of insulation must increase accordingly. This progressive increase is governed automatically by means as next described. ReferringparticularlytoFigs. 2 and 6, the measuring rod I10 is supported by legs I1I having laterally extending feet I12 which are attached by screws to the forward ends of a pair of measuring levers I13. The levers I13 have hubs secured fast on a horizontal rod I14 which is rockably mounted in hearings in the frame-members and 56. The lever I13 shown in Fig. 6 has an arcuate tailpiece I15 projecting rearwardly from its hub and carrying a pin I16 at its end. A connecting rod I11 is pivotally connected at its upper end to the pin I16 with its lower end similarly joined to the rearward end of a lever I18. The connecting rod I11 is preferably constructed of three sections screwed together as shown to provide for adjustment in its length.

The lever I18 is pivoted on the shaft I49, previously referred to, being spaced from the side of the frame-member 56 by a washer I19, see Fig. 13, and held in place longitudinally of the shaft by a collar I83 fast thereon. At its forward end the lever I18 carries a pin or stud I8I for rotatively supporting a roll or follower I82 adapted to engage the periphery of a disk-like measuring cam I fast on the main cam-shaft 10. As will be observed by reference to Fig. 6, the roll I82 is not in constant engagement with the cam I80 being held away therefrom during a part of the cycle of operations through the medium of a rack-bar or measuring gauge I84. The gaugebar I84 is slidable inslotted bearings I85 on thespring I88, the upper end of which is hooked into one of a series of holes in the measuring lever I13 with its lower end anchored to a plate I89 screwed to the frame-member 5B.

The measuring operation takes place as the cam I80 frees the follower I82 to allow the pin I8I to descend against the gauge-finger I81, after which time the strip S is severed by means to be later described, see also Fig. 18. As the cam rotates through substantially one-half a complete revolution its edge of greatest radius engages the roll or follower I82 and raises the forward end of the lever I81 to free the pin from the gauge-finger I81 When this action takes place the rearward end of the lever I18 is depressed and through its connection I11 with the lever I13 it raises the forward end of the lat ter to carry the measuring bar I10 upwardly to the position illustrated by dash lines in Fig. 6 and by full lines in Fig. 15. It will be observed by reference to this latter view that when the bar I10 is in uppermost position, the strip S may pass thereunder in its travel from the rest I62 to the delivery-shelf, indicated generally by the reference character 225.

After the strip S has been fed across the shelf 225, means incorporated therein act to grip the paper to prevent retrogressive movement thereof and at the same time the top feed-roll I25 is raised away from the bottom roll II5'to permit the paper to be drawn freely therethrough. As the cam I80 is further rotated in a contraclockwise direction, as viewed in Fig. 6, the roll I82 rides down the incline of the cam and its pin I8I is again lowered by the force of the spring I88 to the position illustrated by full lines in Fig. 6. In this manner the measuring bar I10 is lowered as illustrated in Fig. 16 to form a loop in the strip of paper.

It has been stated that the length of the loops of paper must be progressively increased during the winding of the coils and to effect this result means are provided for gradually lowering the gauge-finger E81. The gauge-bar I88 is provided with rack-teeth I90 which mesh with the teeth of a pinion gear I! fast on a rotatable shaft I92. The shaft I92 is rotated by means to be later described. Suffice it to state for the present, that the shaft I92 together with its pinion I9I are intermittently rotated or indexed around through a part of a complete revolution to gradually lower the gauge-finger I81 whereby to cause the measuring bar I 10 to be lowered to a progressively increasing extent during the growth of the coils C.

At the start of the winding the circumference of the coils is relatively small and the strip of paper between the rest 62 and the delivery-shelf 225 is of a sufficient length to be wrapped around the coils with a suitable overlap. Consequently, no measuring action of the bar I10 is required and the gauge-finger I81 may be manually adjusted to its uppermost position by means to be later described. After a comparatively few turns of wire have been wound on the winding-mandrel or core, however, the pinion 191 is turned to progressively lower the finger 181 whereby to control the range of movement of the measuring bar 110 in the manner as above explained.

Strip-severing mechanism:--The means for cutting the paper strip to form a sheet of proper dimensions for insertion between the layers of windings comprises a pair of knives, one stationary and the other movable, which cooperate in the manner as later explained.

Referring particularly to Figs. 2, 3, 4, 12 and 15, the forward side of the rest 82 is recessed along its length to receive the lower or stationary knife-blade 200 which is fastened thereagainst by screws 201. The upper side of the blade 200 is beveled off to provide a shearing edge forming a continuation of the upper inclined surface of the block 82.

The upper or movable knife-blade 205 is pivotally mounted between the forward ends of a pair of arms or levers 203, see Fig. 4, and provided with a lower inclined cutting edge. The arms 203 are fixedly secured to a rod or shaft 204 rotatably supported in hubs or bearings at the top of the frame-members 55 and 56. Referring now to Figs. 2 and 12, the forward ends of the levers 203 are formed with hubs 208 for receiving the reduced cylindrical ends or trunnions 201 of a knife supporting bar 208. The bar 208 is of rectangular cross section and the blade 205 is secured to its flat forward face by means of suitable screws as shown.

The knife 205 moves in an arcuate path and it is therefore essential that its cutting edge be maintained in contact with the sharpened edge of the lower knife 200. For this purpose the lefthand trunnion 201 of the bar is extended beyond its bearing 208 and at its extremity is a fixed collar 210 acted upon by a spring 211. The

spring 211 is coiled around the trunnion 201 between the collar 210 and the bearing 205 with its ends secured to each of these elements whereby it tends to rock the bar 208 in the direction to maintain the lower inclined cutting edge of the knife 205 in contact with the cutting edge of the lower knife 200. The arms 203 are maintained in raised position by means as later described and to prevent the knife 205 from swinging back be-' yond the edge of the knife 200 when in this position a projection 212 formed on the bottom of the upper knife bears against the lower knife. Referring to Figs. 15 and 16, the knife 205 is arranged to slide downwardly between the knife 200 and a paper guide-plate 214 attached to the forward edge of the block 82. The guide-plate 214 supports the paper strip in advance of the fixed knife 200 to provide for the proper cooperation of the edges of the two knives. The paper strip is drawn downwardly from the top of the plate 214 during the measuring operation and the upper edge of the plate is rounded off to provide I for a free movement of the paper thereacross.

The arms 203 are operated to carry the knife 205 downwardly to perform the severing operation by means organized as next described. Rockably mounted on the shaft 140 is a knifeopefating lever 215 arranged with its hub abutting the hub of the lever I50, previously referred to, and held thereagainst by a collar 216 fixed on the shaft, see Fig. 13. Connected to one arm of the lever 215 by means of a pin 211 is 9. connecting rod or link 219, the upper end of which is pivotally connected to a pin on one of the knifelevers 203. The link 213 is preferably constructed with end members screw-threaded thereto to provide for adjustment in its length whereby to regulate the position of the upper knife 205 with respect to the lower knife 200.

The forward arm of the lever 215 carries a roll or follower 221 which engages the periphery of a knife-cam 220 fast on the cam-shaft 10. Referring to Fig. 4, the cam-roll 221 is here shown in its lowermost position with the rearward end of the lever 215 rocked upwardly and the arms 203 supporting the upper knife 205 elevated. A spring 222 having one end hooked into a hole in the rearward arm of the lever 215 and its opposite end fastened to the upper rod 114 acts to maintain the roll 221 in engagement with the periphery of the cam 220. As the cam 220 rotates through substantially one-hundred and eighty degrees, its eccentric face forces the roll 221 upwardly and the rearward arm of the lever 215 is rocked downwardly against the action of the spring 222. During this movement of the lever 215 the arms 203 are lowered to carry the upper knife 205do'wnwardly across the fixed knife 200 to sever the paper strip in the manner as later more fully explained The strip-severing operation takes place immediately following the measuring operation as the inclined cutting edge of the knife 205 makes contact with the cutting edge of the lower knife 200 and cuts the strip S with a shearing action to provide a sheet of predetermined size which is held in and transferred to the coil or coils being wound by the operation of the delivery-shelf 225 to be next described.

DeZivery-shelj.-.-'Ihe delivery-shelf 225 is positioned in front of the knives and measuring bar and as herein shown, it comprises a horizontallyextending angle-iron rest or platen 2215 supported at its ends by elbow-shaped levers 221 and 228, see Figs. 3 and 12. The levers 221 and 228 have their hubs fixedly secured to a horizontal shaft 229 extending between the forward ends of a pair of relatively long arms 230. The hubs of the arms 230 are mounted fast, on the ends of a horizontal shaft 231 projecting through bearings on the frame-members 55 and 58. The shaft 231 is adapted to be rotated in its bearings by elevating means, as later described, whereby to elevate the delivery-shelf 225 to the height necessary for effecting delivery of the sheet of paper in proper relation to the periphery of the coil being wound in accordance with the diameter of the latter. During the inoperative stroke of the elevating means the ends of the arms 230 rest upon the top of the bed 2 of the winding machine as shown in Fig. 3. Screwed into bosses at the ends of the arms 230 are bolts 232 arranged with their heads adapted to rest on the top of the bed 2. The bolts 232 may be adjusted to regulate the lowermost position of the arms 230 whereby to govern the initial relation of the delivery-shelf 225 with respect to the coil or coils being wound. The deliveryshelf 225 is normally maintained in close proximity with the measuring bar 110 by resilient means to be later described. To limit the rearward movement of the shelf 225, lugs 234 are provided on the sides of the levers 221 and 228 adapted to engage against finished faces 236 on the frames 55 and 55, see Fig. 15.

As shown in Figs. 12, 15 and 16 the levers 221 and 228 have inwardly projecting ledges 231 to which the angularly-shaped rest or platen 228 is secured. Rising from the top of the ledges 231 are a pair of guide-pins 238 on which a tension-plate 283 is adapted to slide in the manher and for the purpose as'later explained. The pins 238 have shouldered portions or enlargements 239 which are tapered on the sides to fit into countersunk holes in the platen 226 with their shoulders projecting slightly thereabove, see Fig. 15. The lower threaded ends of the pins 238 extend through holes in the ledges 231 with nuts 24! screwed onto their projecting ends to secure them in place on the levers 221 and 226.

Mounted to slide on the upright pins 238 is a tension-plate 243. The plate 243 comprises a sheet-metal strip formed with its rearward side flared upwardly. This flared portion of the plate together with the rearward rounded portion of the angular platen 226 provide a reentrant opening or mouth for receiving the forward edge of the strip of paper as it feeds from the rolls H and 125. The tension-plate 243 is mounted to slide on the pins 238 by means of extended bearing sleeves 244.

Riveted to the top of the tension-plate 243 are a pair of fingers 245 which are bent upwardly and rearwardly to adapt their ends-to engage with the top of the measuring bar I16 as the latter is raised whereby to lift the plate to permit the paper to be fed thereunder, see Fig. 15. The strip ofpaper is fed across the platen 226 by the feed-rolls H5 and I25 and the measuring bar then descends to perform the measuring operation by forming a loop in the strip in the manner as previously explained. During the descent of the measuring bar I16 the tension-plate 243 is lowered against the strip on the platen 226. The bottom of the plate 243 is preferably covered with a suitable friction material such as felt which acts to grip the paper strip against the platen. The weight of the plate 243 causes it to iron out the wrinkles or ridges in the paper which sometimes occur following the shearing operation. As a further means for flattening the strip and stiffening its projecting end, the plate 243 may be curved downwardly slightly at its forward end as shown at 246.

It is essential that the strip of paper be properly gripped on the delivery-shelf during the measuring operation to prevent retrogressive movement thereof. Referring particularly to Figs. 2, 12, and 16, a pair of sheet-metal fingers 248 attached to the rearward side of the ledges 231 reach upwardly above the plate 243. The upper extremities of the fingers 248 are formed with loops or bearings adapted to receive the ends of a horizontal rod 249 which serves as a pivot for a plurality of gripper-fingers 250. The rod 249 is held against lateral displacement by fixed collars abutting the inner ends of the bearings in the fingers 248. Each tension-finger 256 is constituted by a sheet-metal strip curled around at one end to form a loop encircling the rod 249. The base or main portion of the finger 256 is provided with lateral wings or extensions bent at right-angles to form the sides of a trough in which a resilient detent-member 253, preferably constructed of rubber, is positioned. The lower end of the detent-member 253 projects beyond the end of the finger 250 and is beveled on its under side to provide a frictional surface for gripping and retaining the strip of paper on the shelf-plate 226 in the manner as later explained. The member 253 may be secured to the finger 256 by a screw 254 passing through the rubber with a rectangular washer 255 beneath the head of the screw. I

As shown in Figs. 15 and 16, the fingers 256 extend at an angle to the platen 226 and project through apertures 251 in the tension-plate 243. When the measuring bar I10 is elevated as shown in Fig. 15 the tension-plate 243 is raised and the rearward edges of the apertures. 251 engage against the under side of the fingers 250 to swing the paper against the platen 226 to prevent the strip from being drawn rearwardly under the action of the descending measuring bar I10. 0n

the other hand, the forward movement of the paper in feeding to the coils is not resisted by the gripper-fingers.

Elevating means and control therefor.--The sheet of paper or other insulation material,

formed in the manner as previously explained, is

delivered to the coils for insertion between the layers thereof by a forward swinging movement of the delivery-shelf 225 to the position shown in Fig. 11. The forwardly projecting end of the sheet is delivered to the upper surface of the coil and is drawn thereinto by the wire being wound. In order that the sheet may be fed forward to overlie the top of the coil as it increases in diameter it is necessary that the delivery-shelf 225 be progressive'y elevated during the progress of the winding. The elevating movement of the shelf must be in proportion to the growth of the coil, its extent being substantially equal to the thickness of a layer of wire plus that of the previously inserted paper sheet. The means for effecting the progressive elevation of the shelf 225 is arranged as next described.

Referring to Figs. 5 and 9, the rod or shaft 23f carrying the arms 236 also has fixed thereon a cam-arm 260. The arm 266 reaches forwardly and is formed on its under side with a cam-face 26E which curves downwardly toward its pivoted end. Adapted to engage with the cam-face 26! of the arm 260 is a lifter-member 263 which is reciprocated in a substantially vertical direction by means of a cam 255 fast on the shaft 16. The

lifter-member 263 has a lower forked end strad-.

dling the sides of the cam-shaft 16 and carrying a follower or roll 264 whichmakes contact with the peripheral edge of the earn 265 to periodically i raise and lower the lifter. The lifter-member 263 is positioned against the side of the cam 265 and held from displacement in the opposite direction by a collar 266 fast on the shaft 10.

The upper end of the lifter-member 263 is adapted to engage against the cam-face 26! of the elevation-arm 260 to raise it upwardly whereby to rock its shaft 23I and raise the arms 230, In this manner the levers 221 and 228 carrying the delivery-shelf 225 are bodily raised to the position necessary to effect delivery of the sheet to the coils, see Fig. 9.

The forward edge of the lifter-member 263 engages against the edge of an elevation-control cam 210 fast on the shaft 592, previously described as carrying the pinion-gear I9 I, see Fig. 6. The member 263 is maintained yieldingly bearing against the cam 21!! by a coil-spring 268. The spring 268 has one end fastened to an angular finger 269 screwed to the lifter-member and its opposite end is attached to an arm 11I fast on the tie-rod 91.

At the start of the win-ding operation the coils C are relatively small in diameter and the ele vation of the delivery-shelf is unnecessary to effect proper transfer of the sheet to the coils. Therefore, the cam 210 is. provided with a straight edge-portion 213 along which the lifter 283 slides. When the control earn 210 is in the position shown in Fig. 5 thelifter 263 will be reciprocated vertically by the rotating cam 265 with its upper end moving from the position shown by dash lines to that illustrated by full lines. Under this action the lifter-member 263 does not engage the camface 26I of the arm 280 and consequently no elevation of the delivery-shelf 225 takes place.

Immediately the coils start to build up, however, the control cam 210 is slowly rotated in a clockwise direction, as viewed in Fig. 5, whereby its eccentric edge-portion gradually swings the lifter-member 263 rearwardly againstthe action of the spring 268. Now, as the lifter-member 263 continues to be reciprocated by the cam 255 its upper end engages the cam-face 26I on the member 260 to raise the latter and thereby the de livery-shelf 225. During a complete cycle of operations the control cam 210 is intermittently rotated to a slight extent and at each turning movement thereof it moves the lifter 263 longitudinally of the inclined cam-face 26I on the arm 260. The lifter 283 is therefore caused to engage the cam-face 28I successively at points advancing progressively toward the rearward lower end thereof.

The shaft I92 to which the control cam 210 is secured is rotated by means to be next described. Referring particularly to Figs. 3, 10 and 14, the shaft I92 projects beyond the frame-member 56 and carries adjacent its bearing in the frame a spur-gear 216 pinned thereto. The gear 216 meshes with a pinion-gear 211 keyed to the hub of a ratchet-wheel 219. The pinion and ratchetwheel.are rotatably mounted on a stud-shaft 280 "secured to the frame member 56. As herein shown the stud-shaft 280 has an enlarged head 28I at its end and surrounding the stud between its head 28I and the hub of the ratchet-wheel 219 is a coil-spring 283 which frictionally resists retrogressive movement of the wheel.

The ratchet-wheel 219 is intermittently rotated to a slight extent by means of a pawl 285 pivotallymounted on a pin 286 carried at the forward end of a lever 281. The free end of the pawl 285 is maintained in engagement with the teeth of the ratchet-wheel by the force of a spring 289, the ends of which are hooked to pins 290 and 29I on the pawl 285 and lever 281, respectively. The tension of the spring 289 is very slight to permit the pawl to be manually disengaged from the ratchet-teeth in the manner and for the purpose as later explained.

The lever 281 is rocked upwardly to cause the pawl 285 to advance the ratchet-wheel 219 by means of an adjustable earn 293, see Figs. 3 and 14, engaging a roll or follower 295 carried on a pin 294 on the lever. As herein shown the cam 293 is made of three separate elements; namely, an annulus 298, a hub 299 and a slidably adjustable cam-block 300 held therebetween. The annulus 298 surrounds the end of the cam-shaft 10 abutting the side of a bearing on the frame 56 and is provided with a diametrically-extending slot 296 in its face. The slot 295 extends only part way across the face of the annulus so that provision is made for a radial set-screw 291 at one end thereof. The cam-block 300 is adapted to be slid radially in the slot 298 of the annulus 298 whereby to project its pointed end 30I beyond the periphery of the annulus 298, see Fig. 10. The block 300 has a slot 302 through which the shaft 10 extends to provide for this adjustment. Referring now to Fig. 14, it will be observed that the slide-block 300 is slightly greater in thickness than the depth of the groove 296 so that as the annulus 298 and hub 299 are drawn together by means of bolts 303 the block 300 will be securely clamped therebetween in its adjusted position.

The roll or follower 295 on the lever 281 rides on the periphery of the annulus 298 during the greater part of the cycle of operations whereby the elevation-control mechanism for the deliveryshelf 225 remains inoperative. During that part of the cycle in which the delivery-shelf 225 is 285 acts to advance the ratchet-wheel 219 to an extent which is regulated by the position of adjustment of the cam-block 300. The ratchetwheel 219 turns the gear 211 to drive the gear 218 and thereby the shaft I92 is rotated to turn the control cam 210 through a part of a complete revolution for the purpose as before explained. Through the intermittent turning of the shaft I92 the pinion-gear I90 is rotated to lower the rack-bar I86 and its attached gauge-finger I81 whereby a progressive increase in the descent of the measuring bar I10 is effected as previously explained.

For winding coils from wire of different size or gauge and using insulation of different thickness the rotative movement of the control cam 210 and the downward travel of the gauge-finger I81 must be varied accordingly. For this purpose the cam-block 300 is adjustable in the annulus 298 to regulate the extent to which its pointed end 30l projects beyond the periphery of the annulus. By adjusting the throw of the cam 300 the extent of movement of the arm 281 and pawl 285 is regulated. This adjustment is accomplished by first loosening the bolts 303 to permit sliding movement of the block 300 in the slot 296. The set-screw 291 is then turned to engage the inner end of the block whereby a precise radial adjustment of the block is effected, the block being pushed outwardly or inwardly according to requirements as determined by the size of the wire and the thickness of the paper. After this adjustment is made the bolts 303 are again tightened to clamp the cam-block 300 in place.

The cam-shaft I92 is periodically rotated throughout the coil-winding operation by the instrumentalities described above and manuallyoperable means are provided for resetting the shaft I92 to initial position after the completion of the coil winding. When the machine is first started to perform the winding operation the control cam 210 must be turned to the position illustrated in Fig. 5 with its flat surface 213 in contact with the lifter-member 263. At the same time the gauge-finger I81, see Fig. 6, must be raised to render the measuring bar I10 inoperative. This resetting of the parts is effected manually by means as next described.

Referring particularly to Figs. -10 and 14, the shaft I92 extends outwardly beyond the hub of the gear 216 and upon its end is an arm 306

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