US2220256A

US2220256A - Coil winding machine

Info

Publication number: US2220256A
Authority: US
Inventors: Martindell Frank
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1937-10-15
Filing date: 1937-10-15
Publication date: 1940-11-05
Anticipated expiration: 1957-11-05

Description

CO IL WINDING MACHINE Filed Oct. 15, 1937 7 Sheets-Sheet 1 awn/ml? f. MA RT/NOELL era fi Arramvzr 1940- F. MARTINDELL COIL WINDING MACHINE Filed Oct. 15, 1937 TSheets-Sheet 2 Nov. 5, 1940. F. MARTI'NDELL COIL WINDING MACHINE Filed Odt. 15, 1937 7 Sheets-Sheet 3 INVENTOR [MART/NOAH WW I A 77' ORA E V 1940- F. MARTINDELL COIL WINDING MACHINE- Filed Oct. 15, 1957 '7 Sheets-Sheet 4 lNVf/VTOR [MART/N05 8y 1940- EMARTINDELL com wnmn ze m cnma Filed Oct. 15, 1937 7 sheets-Sheet 5 NOV. 5, 1940. F MARTlNDELL. 7 2,220,256

COIL WINDING MACHINE Filed 001'.- 15, 1937 7 Sheets-Sheet 6 v I V I g M/VENTOR E MART/NDEZL N 5, 1940- F. MARTINDELL 2,220,256

COIL WINDINGMACHINE I Filed Oct. 15, 1937 7 Sheets-Sheet 7 zoo 'Arroliwzr Peee tea Nov. s, 1940..

Y UNITED STATES PATENT OFFICE 2,220,256 L I con. wmpmo mcnnvr.

Martindell, Western Springs, Ill., assignor to Western Electric Company, Incorporated,

New York, N. Y., a corporation of New York Aprucauo 'oeioser 15, 1931. Serial No. 169,132

26 Claims. (o1. 164-42) This invention relates to coil winding machines, and ,more"particu1arly to mechanism for introducing or injecting measured sheets of insulating material between superimposed layers of coils I while they are being wound.

In the Hofstetter et a1. patent, 2,030,989, granted February 18, 1938, there is disclosed a coil winding machine in which mechanism is provided for'delivering measured sheets of insulating ma- 1o nterial m coils being wound for insertion between the superimposed layers of windings, the said .mechanism comprising means for withdrawing and severing measured lengths of sheet material from a continuous strip thereof, anda pair of 16 intermittently driven rollers for delivering the severed sheets to the coils. The mechanism referred to also comprises means for automatically increasing the'length of successive sheets and for adjusting the position of the sheet delivery rollers 20 tocompensate for the increasing diameter of the coils being wound.

Objects of the present invention are to provide an improved, self-contained, reliable and readily adjustable sheet material handling mech so for withdrawing and severing sheets of successively increasing lengths from a continuous strip of sheet material, and means, preferably in the form of spring operated rollers, adapted to first position the sheet with its forward edge in close 35 proximity to the coils being wound and then, at the proper time, deliver the sheet to the coils for insertion between the superimposed layers of windings. Means is also provided for preventing operation of the several mechanisms except at 40 the proper times and in the desired sequence.

Other features and advantages of the invention will be apparent from the followingdetailed description when read in conjunction with the accompanying drawings, in which Fig. 1 -is a plan view of a sheet material handling mechanism embodying the invention in perative association with a coil winding arbor;

. Fig. 2 is an enlarged side elevational view, look- 50 ing from the left side of Fig. 1;

Fig. 3 is a side view similar to Fig. 2, but with some of the parts broken away to more clearly illustrate the sheet delivery roller operating mech-' anisms which are shown in different positions 55 than in Fig. 2;

Fig. 4 is an enlarged vertical sectional view taken online 4-4 of Fig. 1;

Fig. 5 is an enlarged vertical sectional view taken on line 5- of Fig. 1; Fig. 6 is an enlarged fragmentary sectional view 5 taken online 8-8 of Fig. 1;

Fig. 7 is an enlarged fragmentary sectional View taken on the line 'l-.| of Fig. l;

Fig. 8 is a sectional view similar to Fig. '7 with some of. the parts shown in diiferent positions 'thanin Fig. 7;

Fig, 9 is a fragmentary sectional view taken on line 9-9 of Fig. 4, but showing the clutchin the normal or disengaged position;

Fig. 10 is an enlarged detail section taken on line l0lIiofFig.4;

Fig. 11 is an enlarged detail section taken on line li--ll of Fig. 1;

Fig. 12 is a detail section taken on line l2--i-2 of Fig. 11, and m Fig. 13 is a schematic illustration of the electrical operating and control circuits.

It will be noted that in Figs. 1, 2, 4 to 8, inclusive, and 10 to 12, inclusive, the several operating parts are shown in the positions which they assume at some intermediate point during an operating cycle of the mechanism, while in Figs.

3, 9 and 13, theparts illustrated are shown in their "at rest positions, i'. e., in the positions which they assume during the interval between 80 successive operating cycles of the mechanism.

Referring to the drawings, and first to Fig. 1 thereof, it will be seen that the mechanism is shown associated with a coil winding machine arbor or mandrel 20 which is mounted in the 88 usual rotatable head and tail stocks 2i and 22, respectively. The head stock is provided with the usual hand wheel 23 and is adapted to be driven by any suitable power means (not shown). The

winding arbor is preferably constructed and/or 40 of the arbor, suitable means being provided for distributing the wires evenly on the arbor and in superimposed layers.

It is believed that the above brief reference to the winding arbor and wire distributing means is sufiicient to a complete understanding of the present invention, which pertains primarily to mechanism for withdrawing and severing pro- 88 'rest on and-be attached to a suitable table or bench top 26. The base plate is formed at its rear end with two spaced apart upstanding arms or brackets 21 and 28. Pivcted at its rear end at 28 between the upper ends of the brackets 21 and 28 is an angularly adjustable frame 8! comprising spaced apart side plates 82, I2, rigidly interconnected at their rear ends by a horizontal spacer bar 84 and at their forward ends by a spacer bar 85. At its forward end, the pivoted frame II is supported by a carriage 81 adapted to ride on a pair of cam tracks 88,-" for a p se hereinafter described.

Referring to Figs. 2, 5, 7 and 8, it will be seen that the forward ends of the side plates 82 are disposed adjacent the winding arbor 28 and rotatably support. a lower sheet delivery roller 48.

This roller is mounted on a horizontal shaft 4i rotatably journalled at its ends in

bearings

48, 48 mounted in

vertical slots

44, 44 in the forward ends of the side plates, For cooperating with the lower roller 48, an upper roller 46 is mounted -'on a horizontal shaft 41 rotatably journalled at its ends in

bearing blocks

48, 48 which are pivotally suspended by means of

pins

48, 48 from the forward ends of horizontal bars 58, 58, The bars 58 are pivoted at their rear ends at 5i, 5i to

vertical plates

52, 52 secured to the rear ends of the side plates 32. The forward end of each of the bars 58 is yield-ably pressed downwardly by a vertical coil spring 54 having its upper end fastened to the bar and its lower end attached to the adjacent side plate 82.

The ,bearing blocks 48 which carry the upper roller 48 are vertically slidable in the vertical slots 44 of the side plates, and the downward pull of the springs 54 presses the upper roller downwardly against the lower roller 40. The vertical slots permit raising or separating the upper roller from the lower roller to facilitate the insertion of the forward edge of the material between the rollers and also to facilitate withdrawal of the severed sheet from between the rollers by the coils being wound after the forward edge of the sheet has been grasped by the wires being wound.

Upon the upper roller shaft 41, near each end thereof, there is mounted a cam 53 (Figs. 4 and 10) andbelow each of these cams a cooperating collar 55 is fixed to the lower roller shaft 4|. The

cams have high portions 54 which cooperate with the collars to separate the upper roller from the lower roller as soon as the sheet has been delivered to and grasped by the wires being wound into coils. Each of the cams has a projection 58 for cooperating with collar 55 to prevent countersuccessive layers of windings. In the illustrated embodiment of the invention. the upper roller 48 is adapted to be rotated by an endwise movable rack bar 51 (Figs, .2 and 3) intermeshing with a pinion 58 on one end of the upper roller shaft 41. The bearing block 48 at this end of the roller shaft carries a flanged guide roller 58 under which the rack bar 51 is adapted to slide and thereby beheld in driving engagement with the pinion. Lateral displacement of the rack bar is prevented by the guide roller, flange which slidably holds the rack bar against the outer surface of the bearing block, as shown in Fig. 4. At' its rear end, the rack bar is slidabiy guided in a slot 52 of a bifurcated guide and stop block 83 secured to and projecting upwardly from the upstanding bracket 21 of the base plate.

An angle plate is attached to the outer side of the rack bar and a coil spring 85' has one end fastened to the angle plate and the other end attached to frame bracket 21, so that the spring serves-to move the rack bar rearwardly.' A transverse stop pin 58 in the rack bar is adapted to engage the front side of stop block 88 to limit rearward movement of the rack bar. During each cycle of its operation, as hereinafter described, the rack bar is held in an intermediate position by the engagement of a shoulder 18 on the tail end -of the rack bar with the front side of block 68.

The tail end of the rack bar is normally held down by its own weight and also by the downwardly inclined spring 88, so that when the rack bar is shifted rearwardly from its foremost position (Fig.2) the shoulder I8 is urged into engagement with stop block 68, thereby stopping and holding the rack bar in the intermediate position (Fig. 8).

An electro-magnet or solenoid 12 is provided which is energized at the proper time to elevate the tail end of the rack bar sufficiently to release the stop shoulder 18 from stop block 83 and thereby permit spring 85 to further shift the rack bar rearwardly until stop pin 88 engages the front side of the stop block. The solenoid is mounted on one of the side plates 82 of pivoted frame 3i and comprises a plunger I3 to which a pair of spaced-links I4, 14 are pivotally connected, The links loosely straddle the rack bar and are connected at their bottom ends by a spacer pin I5 which carries a roller adapted to engage the under side of the rack bar and lift it when the solenoid is energized The rack bar is intermittently moved forwardly, against the opposing force of spring 65, by an oscillatory angular arm II This arm is pivoted at its lower end on a shaft 18 journalled in brackets 18, 18 depending from the base plate 25. At its upper end, the pivoted arm 11 carries an adjustable striker screw 19 adapted to engage the rear face of angle plate 55 on the rack bar. The pivoted arm is swung forwardly by a crank arm 88 on a cam shaft 8|, the crank arm carrying a roller 82 for rolling engagement with the pivoted arm. The pivoted arm is returned by a coil spring 84 and its return movement is limited by the engagement of an adjustable stop screw 85 on the pivoted arm with a stop lug 85 on adjacent bracket 18.

The cam shaft 8i is rotatably mounted in up-' standing bearings 81 on the base plate 25 and is intermittently driven from a continuously rotating sprocket wheel 88 (Figs. 4 and 9) which 'is free to rotate on the cam shaft. The sprocket wheel is formed with a series of driving clutch teeth 88. Also mounted on the cam shaft is a.

driven clutch member 90 having a series of clutch teeth 8i adapted to inter-engage with the driving clutch teeth, of the sprocket wheel. The driven clutch member is slidable on the shaft into and out of driving engagement with the driving sprocket wheel; and the shaft is constrained torotate with the driven clutch memspring 95 normally tends to shiftthe driven ber since the latter has a sliding tongue and groove connection 93 with a sleeve 94 fixed to the shaft, as shown in Fig. 9. An adjustable clutch member into driving engagement with the driving sprocket wheel, and a roller 86 onthe end of a plunger 91 normally engages a high portion 92 of a shoulder cam surface 98 on the driven clutch member to hold the latter in the disengaged position. The plunger is slidable in and upon de-energization of solenoid IOI,'-the plunger is spring returned to the projected position in which the roller rides along the low portion of cam surface 98. Upon rotation of the camshaft through one complete revolution, the high portion 92 of the cam surface approaches and finally engages roller 96, thereby shifting the driven clutch member out of engagement with the rotating sprocket wheel, whereupon stop lug I04 positively prevents further rotation of the cam shaft.

' An annular disk I06 (Fig. 9) ismounted on the cam shaft between the driving sprocket wheel and the driven clutch member, and is slidably keyed to the latter by a slot and tongue connection I01. A spring I08 presses the disk I06 toward the driving sprocket wheel and a leather washer I89 is interposed between the disk and the driving sprocket wheel. This, in effect, provides a friction drive between the sprocket wheel and the driven clutch member, which serves to insure that the one-revolution cam shaft 8i will at all times'come to rest at the same position in which the stop lug I04 engages the underside of the plunger roller 96.

Means is provided for' intermittently withdrawing a continuous strip of sheet material from a supply roll thereof and inserting the forwardedge of the strip between the

sheet delivery rollers

40 and 46. This means comprises a reciprocatory horizontal plate or table I I I'disposed between and rigidly attached to a pairof spaced upstanding members H2, H2. Each of the members II2 has two spaced apart stub shafts H4 and H5 projecting horizontally from the outer sm'face thereof, the stub shafts II4 being mounted near the rear ends of rearwardly extending tail portions III, III of the members I I2. Rollers I I6, I I 6, mounted on the stub shafts,

are adapted to ride in horizontal slots H8, H8

The r As .soon as a stop lug I 04 on the driven clutch member passes the roller 96 on the end of the plunger the arms I22 forwardly the table III is moved forwardly toward the sheet delivery rollers and by swinging the arms rearwardly the table is moved rearwardly away from the sheet delivery rollers. The oscillatory arms are swung forwardly by two crank armson cam shaft 8I. .One of these crank arms, 80, has already been referred to and, as shown in Fig. 4. its roller 82 is of sufficient length to engage and operate the roller operating arm 11 as well as the adjacent table operating arm I22. The other crankarm, I24, carries a roller I26 for engaging and operating the other table operating arm I22. A pair of torsion springs I26, I26 on shaft I6 serve to swing the arms I22 rearwardly to-thereby move the table III rearwardly away from the sheet delivery rollers. Rearward movement. of the table is limited by stops I25, I25 adjustably mounted on the carriage 31. r p

A clamping bar I28 (Figs. '1 and8) extends across the top of the paper supporting table III and is attached at each end to the forward portion of a substantially horizontal supporting arm I29. The arms I29 are pivoted at their rear ends on studs I 80, I30 projecting inwardly from tire tail portions III of the table supporting members II2. Thus theclamp bar I28 is vertically movable toward and awayfrom the upper surface of table II I. A sponge rubber strip I82 is provided on the underside of the clamp bar for yieldably clamping the strip material to the table. 1

The clamp bar is normally held in a raised or open position by a pair of leaf springs I33, one at each end of the clamp bar. Each of the table supporting members II2 has an overhanging bearing I34 attached to its upper end and each of the bearingsi34 has an inwardly projecting stud I35 which pivotally supports a right angle lever I36. The lever comprises a downwardly projecting arm I38 and a forwardly projecting arm I39. A latch member I is adjustably fixed to the downwardly projecting arm I38 of each of the angle levers, so that when the angle levers are swung from the position shown in Fig. 7 to the position shown in Fig. 8, the latch members press arms I29 and clamp bar I28 downwardly, thereby causing the sponge rubber strip I32 to firmly clamp the strip material to table I I I. Each of the bearings I34 has a second inwardly projecting stud I42 at its rear endand a latch actuating arm I43 is pivotally suspended from each of the studs I42. At their lower ends swing the angle levers together with the latch members I40 from the release position (Fig. 7) to the clamping position (Fig. 8). I41 on each of the latch actuating arms I 43 engag'es the top surface of the corresponding bearing I34, therebynormally holding the latch actuators in the position shown in Fig. 7.

The forward edge of table III is formed with a series of spaced forwardly projecting fingers I49. I49 and yieldably pressing against the top of these fingers are similarly spaced spring fingers I50, I50 which are attached to and project for.- wardly from the clamp bar I28. The sheet .

delivery rollers

40 and 46 areprovided with spaced (3v 0nd roller no. Each of the rollers m a and A stop pin peripheral grooves I52, I52 for receiving the fingers I43 and I35 upon movement of table III to the forward position shown in Figs. 5 and '7.

Each of the upper roller supporting bars 55 has a handle bar I55 attached to the upper surface of its forward end, 'and bymeans of the handle bars the upper roller 45may be manually raised or separated from the lower roller 45. Attached to each of the handlebars I55 is a cam block I55 having an inclined cam surface I51. For each of the cams I55 there is a cooperating cam, follower I53 pivotally mounted on the outer surface of the associated table supporting member II2. Stop pins I55 prevent counter-clockwise rotation of the cam followers beyond the 'position shown in Figs. '7 and 8, and torsion springs I5I normally tend to rotate the cam followers counter-clockwise so that they are yieldably held in position against the stop pins.

During the forward movement of the table ill from the position shown in Fig. 8 to the position shown in Fig. '7, the cam followers I55 slide along the inclined cam surfaces I51, thereby raising the upper roller 43 to permit insertion of the forward end of the strip material between the rollers. As the table reaches its foremost position the cam followers slide past the cams I55, whereupon the upper roller 45 is free to drop by gravity and also by the pull of the springs 54, whereby the forward end of the strip is firmlyclamped between the rollers, as shown in Fig. 7. As the 'upper roller drops into clamping position, adjustable abutting screws I52 carried by the handle bars I55 of the upper roller supporting bars strike the forwardly projecting arms I35 of the angle levers I35, whereby the latter are rotated in a clockwise direction from the position shown in Fig. 8 to the position shown in Fig. 7. This releases the clamp bar closing latches I45, thus allowing leaf springs I33 to raise clamp bar I25 out of clamping engagement with the strip material. table I II from the position shown in Fig. '1 to the position shown in Fig. 8, the table and clamp bar are free to slide along the continuous strip of sheet material, while the latter is prevented from shifting rearwardly with the table since the forward edge of the strip is now firmly clamped between the rollers 45 and 45. It will be obvious that during the rearward movement of the table and clamp bar, the cam followers I55 are free to rotate in a clockwise direction ag'alnstthe opposing force of torsion springs I5I 'and, therefore, are ineffective for raising the upper roller 45. After the table has reached the end of its rearward movement the continuous strip is severed transversely along a line anteriorly of the forward ends of gripping fingers I45 and I55, as shown in Fig. 8. The severing means comprises a pair of power operated knives I55, I55 and a cooperating relatively stationary knife bar I55, both mounted on and movable with the carriage 31 previously referred to. The knife bar I55 is attached to the forward edge of the carriage just below the reciprocatory table III, as shown in Figs. 5, '1 and 8; The knives I55 are attached to a supporting bar I55 carried at the outer ends of a pair of arcuate oscillatory arms I55, I55 (Fig. 5) which are fixed to a horizontal shaft I15 rotatably journalled in bearing brackets "I attached to carriage 31. As shown in Fig. 4, the cutting edges of the knives I55 taper to a central point for piercing the paper to start the cutting operation. Also, the knives are made 55 of spring steel and are slightly bowed to insure Thus, during the return movement ofa nice cutting'fit with the cutting edge of knife bar I33.

In accordance with a feature of the present invention, the severing mechanism is operated by means of a yieldable pantograph leverage mechanism actuated by a cam I13 on cam shaft M. This leverage mechanism is indicated generally in Figs. 1, 4 and 5 by the reference numeral I15 and comprises a cam lever I15 pivoted intermediate its ends by being attached to a horizontal shaft- I11 rotatably mounted in an upstanding bearing I13 on base plate". A roller I15 carried at one end of cam lever I15 is confined in a cam groove I35 in the face or cam I13. The opposite end of cam lever I15 has a floating pivotal connection III with the lower end of an adjustable link I52. This link is pivotally connected at its upper end to one corner of a triangular piate I33. The plate I 53 has a floating pivotal connection I34 with the upper ends of a pair of spaced links I55, .I55, which links have their lower ends loosely pivoted on the cam lever shaft I11. The triangular plate I53 is pivotally connected at I54 to the rear ends of a pair of arms I51, I51, which arms are carried by the carriage 31 by being pivotally connected at their forward ends on the horizontal shaft I15 mounted on the carriage. The plate I53 also has a slidable pivotal connection I33 with a bifurcated end I59 of a link I55 and the opposite end of the link is pivotally connected to the free end of a lever arm I52 attached to shaft I15. A tension spring I53 normally tends to rotate lever arm I52 in a clockwise direction and the pivot pin I55, by engaging the bottom of the slot I55 in the link I55, serves as a movable stop for opposing the force of the spring.

Referring particularly to Fig. 5, it will be seen that cam groove I55 comprises a low portion I94, which, upon rotation of the cam, causes rotation of cam lever I15 in a clockwise direction. The clockwise rotation of cam lever I15 is transmitted through link I32 to plate I53. The resulting clockwise rotation of plate I53 about pivot I84 shifts stop pin I33 rearwardly, thereby permitting spring I53 to rotate lever arm I52 in a clockwise direction to effect a downward severing motion of the knives I55. Thereafter, the high portion of cam groove I rotates cam lever I15 counter-clockwise and through link I32, plate I53 and link I55, the lever arm I 52 is positively rotated counter-clockwise, thereby raising the knives to their original or starting positions. It will be noted that the severing movement of the knives is effected through the spring I93, which is adapted to yield and thereby prevent damage in the event that some foreign object gets into the path of the knives.

During the first portion of the downward motion of the knives, fingers I5I, I5I on the knife carrying arms I55 engage shoulder cam surfaces I55, I55 of latch operating arms I43, whereby the latter are shifted to move latches I45 from the release position to the position shown in Fig. 8, so that the strip material is firmly clamped between table III and clamp bar I23 during the severing operation.

Since, as mentioned above, the severing means is mounted on and movable with the carriage 31 and since the forward edge of the continuous strip is always advanced to substantially the same position between the sheet delivery rollers prior to each severing operation, it is apparent that the position of the carriage on the cam tracks 35 determines thelength-of the sheet that is severed 'from the continuous strip and later inserted into provided at eachend with a pair of spaced rollers I00, I 80 adapted to ride in track grooves Il'l,

' I01 on the inner surfaces of the pivoted frame side plates 22. Also, at each end of the carriage there isprovided intermediate and below the two rollers I22 2. third roller I for rolling contact with the cam tracks 22. Forward movement of carriage 21 is limited by the engagement of. rollers I22 with adJustable stops 200 on cam tracks 22. These stops are attached to the cam tracks bya screw and slot connection 20I, whereby they are adjustable lengthwise of the cam tracks to vary the starting or foremost position of the carriage 21 in accordance with the diameter of the wind- I ing arbor or first" layer of windings on the arbor.

' The stops are adjusted so that the first severed spondingly increase the length of successive sheets of interleaving material. This is accomplished by increasing the distance between the severing knives and the sheet delivery rollers by imparting a step-by-step rearward movement to carriage 21 at or near-the begining of each layer of windings. The means for imparting this step-by-step movement to the carriage will now be described.

In the rear end portions of the pivoted frame side plates 32 there is rotatably mounted a horizontal cross shaft 205 and fixed to opposite ends of this shaft are a pair of

pinions

200, 200 in driving engagement with a pair of rack bars 201, 201 attached to the underside of carriage 21. Thus, upon rotation of shaft 205 in a counterclockwise direction (Fig. the carriage is moved .rearwardly on cam tracks 28 away from stops 200 and, thereafter, upon clockwise rotation of the shaft the carriage is moved forwardly. A torsion spring 200 on shaft 205 is arranged to rotate the shaft in a clockwise direction and thereby return the carriage to its foremost or,

starting position against the stops 200. Step-bystep rotation of the shaft in a counter-clockwise direction is accomplished by means of a spring friction ratchet mechanism shown in Figsal, 2, 11 and 12, wherein it is indicated generally by the reference numeral 2I0.

The ratchet mechanism above referred to is illustrated in detail in Figs. 11 and 12. It comprises three sleeves 2| I, 2I2 and 2I2 mounted end to end on the shaft 205 between a pair of fixed adjacent inner ends of the springs terminate in straight depending portions HI and 222, respective'ly. and the ends of the springs are-fixed to the sleeves 2Il and2t2, respectively. An arm 24 to thereby prevent rotation of the sleeve.

From the above description, it will be apparent 226 fixed to sleeve2|2hssb bifurcated end portion 222 (Fig. 11) endagins the fixed spacer bar that rotation of sleeve 2 in a counter-clockwise direction (when viewed from the left of Fig. 12)

will. in eifect. tend to wind spring 2Il, thereby causing it to contract and more flrmlygrasp the sleeve 2I2 so that this sleeve together with shaft 200 is also rotated in a counter-clockwise direction- At' the same time, the counter-clockwise rotation of sleeve 2I2 will, in eifect, tend to unwind spring 2 'I2, thereby causing it to expand so. as to permit free rotation of sleeve 2I2 with respect thereto. Likewise. when collar 2 is rotated in the opposite direction, spring 2|! is expanded and spring 2I2 is contracted, so that the latter spring now prevents rotation of sleeve 2I2 and shaft 200 while spring III and sleeve III are free to turn on sleeve 2l2 and shaft respectively.. counter-clockwise step-by-step rotary motion is imparted .to the shaft 202. This movement of the shaft is transmitted through pinions 202 and rack bars 201 to impart a step-by-step rearward movement to the carriage 21.

' Referring to Figs. 2 and 3, it will be seen that the oscillatory motion of one of the table operating arms 122 is utilized for imparting an oscillatory movement to the sleeve 2| I. Fixed to this sleeve is a clamp 22! which rotatably carries a depending arm 222, and upon the lower end portion of this am a connecting block 222 is threaded for adjustment lengthwise of the arm. The connecting block is-pivotally connected to one end of a link 222. At its opposite end, link 220 is pivotally connected to the upper end of a vertical lever 220 which is pivoted at its lower end to an upstanding bearing 22I on base plate 22. An arcuate bar 222 has one end pivotally connected to lever 220 intermediate its ends and, at its opposite end, bar 222 has a downward bent portion 224 adapted to be engaged by a stud 220 secured to and projecting laterally from the oscillatory arm I22. The free end of bar 222 rests on the stud 222 and lateral displacement thereof is prevented by a pair of spaced guide pins 220,220

projecting vertically from the studyas clearly showninFig'A.

Thus, 'by'oscillating sleeve 2, a

During the final portion of the forward move ment of arm I22 from the normal position shown in Fig. 3 to its foremost position shown in Fig. 2, 1

stud 220 on arm I22 engages the downwardly the bar forwardly. This motion is transmitted through lever 220. link 222 and arm 220 to effect a counter-clockwise movement of the spring ratchet sleeve 2. Return movement of this sleeve is effected by a coil spring 222 having one end attached to lever 222 and its opposite end attached to the upstanding arm 21 of the base plate. The lower end of lever 220 is formed with a right angle projection 240 provided with an. adjustable stop screw 2H adapted to engage the base plate and thereby limit the return movement of the lever, thus limiting the return movement of spring clutch sleeve 2| I.

From the above description it is believed. apparent that each-time the table III is moved forwardly to insert the forward end of the continuous strip of sheet material between the delivery rollers 40 and 00, the carriage 2! is shifted rearwardly so that each sheet that is severed from the continuous strip is slightly longer than the preceding sheet to compensate for the increasing circumference of the coils being wound. The extent of each rearward movement of the carriage may be varied according to the size of the wire being wound by adjustingstop screw 2 and. also by adjusting connecting block 226 on threaded arm 228, the latter adjustment being obtainableby simply turning the arm in block Obviously, after a "stick" of coils has been completely wound and before starting to wind another "stick" of coils, the carriage 8115 returned to its original or starting position against the stops 266 on cam tracks 88. As mentioned above, the torsion spring 268 on shaft 265 serves to return the carriage to the starting position. Normally, torsion spring 268 is overpowered by the holding eilect of ratchet springs 2l5 and M6 on sleeve 2i2 fixed to shaft 265. A manually operated pull rod 245 is provided for releasing the ratchet springs and thereby allowing torsion spring 268 to rotate shaft 265 ina clockwise direction (Fig. 5) and return the carriage to the starting position. At its forward end, the

' pull rod is slidably supported by a vertical front plate 246 and a fixed vertical guide plate 241 slidably supports the rear end of the pull rod The rear end portion (Figs. 1, 2, 11 and 12). of the pull rod lies between the depending ends 22| of ratchet springs 215 and H6 and is provided with a transverse pin 249. When the pull rod is shifted forwardly the pin 249 engages the depending ends of the ratchet springs, thereby unwinding and releasing the springs from clamping engagement with sleeve H2 and thus allowing torsion spring 266 to return the carriage to the starting position. The pull rod is returned by a spring 256, the return movement being limited by the engagement of a hand knob 25! on the forward end of the rod with the front face of vertical plate 246. v

In order to insure that the sheet of interleaving material will be quickly and properly grasped by the coils being wound upon being delivered thereto by the

rollers

46 and 46, it is essential that the position of the sheet delivery rollers with respect to the coils being wound be such that the sheet is delivered to the coils tangentially thereof and into the bight between the wound turns and the oncoming wires. Therefore, for each superimposed layer of windings .it is necessary that the sheet delivery rollers be elevated slightly to compensate for the increasing diameter of the coils being wound. This stepby-step upward movement of the sheet delivery rollers is preferably obtained by having the car- I riage supporting upper edges of cam tracks 38 upwardly inclined from front to rear, as shown in Fig. 5, so that with each rearward movement 'of the carriage the forward endof the pivoted frame and the sheet delivery rollers carried thereby are elevated sufliciently to compensate for the increasing diameter of the coils being wound.

Means is provided for adjusting the initial or starting position of the sheet delivery rollers according to the diameter of the winding arbor or first layer of windings. This means is best shown in Figs. 4 and 5. The forward ends of cam tracks 38 are rigidly attached to opposite ends of a horizontal spacer bar 252. This spacer bar rests on top of

bearings

253, 253 projecting forwardly from the upper comers of the vertical front plate 248 so that this plate, in effect, suplower corners of the plate. A vertical screw 266 (Figs. 4 and 5) has a threaded connection'with a centrally located bearing 2" on plate 248. Endwise movement of the screw is prevented by a lug 263 fixed to the base plate and interengaging a grooved collar 264 on the lower end of the screw. At its upper end the screw is provided with a knurled knob 265 for manually turning the screw.- The vertical plate is provided with a slot 266 to accommodate knob 265. It willbe apparent that rotation of the screw in one direction will elevate the vertical plate 246 and with itthe forward ends of cam tracks 88, thereby elevating the sheet delivery rollers. In a similar manner, rotation of the screw in the opposite direction will lower the sheet delivery rollers.

In Figs. 2 and 5 there is shown a supply roll 261 containing a continuous strip 216 of paper or other suitable interleaving material. The supply roll may be rotatably mounted in any suitable manner, preferably underneath the rear edge of the bench top 26. The free end of the continuous strip is drawn from the supply roll upwardly and around a guide roller 268 and inserted between table Ill and clamp bar I28 with the forward edge of the strip projecting slightly beyond the forward ends of the gripping fingers I49 and I56, as shown in Fig. 8.

A preferred electrical control circuit arrangement for the mechanism is illustrated schematically in Fig. 13. The arrangementcomprises a pair of normally

open switches

286, 286 which are conveniently mounted in spaced apart relation so that one or the other is closed by an abutment 281 on the usual wire guide traverse 'bar 282 at the end of each layer of windings. Either of the switches 286, when closed, connects one side 284 of an electrical current supply to one terminal of a service receptacle or socket 285 through a pair of normally closed contacts 286 and a manually operable main control switch 281. The other terminal of socket 285 is connected directly to the other side. 288 of the current supply. The energizing windings of clutch.

operating solenoid HI and sheet delivery roller trip solenoid 12 are connected to a plug 266 which is removably connectable to socket 286. A switch 292 is connected in the energizing circuit of trip solenoid 12 and this switch is controlled by a cam 294 on cam shaft 8|. 'to close switch 292 only when the cam shaft is in the at rest position shown in Fig. 13. In other words, upon rotation of the cam shaft the contacts of switch 262 immediately spring open and remain open until the cam shaft completes one revolution and again arrives at the at rest position. This prevents more than one operation of trip solenoid 12 for each cycle of operation of the sheet material feeding mechanism.

The socket and plug connection above referred to serves as a convenient means for readily disconnecting the control solenoids 12 and "II of the sheet material feeding mechanism from the current supply lines at will. A manually operable normally open switch 296 is provided for operating the sheet material feeding mechanism at will and independently of the traverse bar operated switches 286.

In coil winding machines of the general type The cam is arranged time as solenoid =12, retracts clutch holding herein referred to, it is custbmary to employ an adjustable stop counter adapted, upon the c0mpletion of a predetermined number of mm: or

layers ofwindings, to close a normally open switch and thereby energize a stop solenoid for effecting the stopping of the winding arbor. Such an arrangement is schematically illustrated in Fig. 13, wherein a counter operated normally open switch 296 controls a stop solenoid299. The stop solenoid, when energized, opens the normally closed contacts 266, thereby interrupting the current supply to the control and operating solenoids l2 and I 6| of the sheet material feeding mechanism, except through the manually operable normally open switch 296. The current supply to these solenoids is, of course, also interrupted by main control switch 261, when open.

The operation of sheet material feeding mechanism is, briefly, as follows:

When the mechanism is inactive, the cam shaft clutch is disengaged, as shown in Fig. 9; the reciprocatorytable III is in the retracted position, as shown in Fig. 8; the delivery roller operating rack bar is either in the intermediate position, as shown in Fig. 3, or in its rearmost position; the switch closing cam 294 is in the switch closing position, as shown in Fig. 13; and

manually operable switches 26! and 296 are open.

In setting up the mechanism for operation, the reciprocat ory table stops I25 are adjusted so that when the table is in its retracted position, the forward ends of gripping fingers I49 and I56 are positioned slightly behind the cutting edge of knife bar I66, as shown in Fig. 8. Then, by adjusting the striker screw I9 on rack bar operating arm 11, the extent of the forward movement of the rack bar is adjusted so that during the rearward movement of the rack bar from its foremost position (Fig. 2) to its intermediate position (Fig. 3) the delivery rollers are rotated sufliciently to roll-out or advance the continuous strip to a position in which the;forward end of the strip'is in close proximity to the winding arbor. Next, the carriage stops 266 are adjusted so that the first severed sheet will be of the required length, as explained above. Then,

I with the carriage in its foremost position against stops 266, the-height of the forward ends of carriage supporting tracks 38 is adjusted so that the

sheet delivery rollers

46 and 46 will be at the proper level. The free end of the continuous or strip 216 of sheet material is then drawn from supply roll 261 and passed around guide roller 268 and between table III and spring gripping fingers I56. The clamp bar I28 is now pressed into clamping engagement with the strip mate-'- rial by manually swinging the latches I46 counter-clockwise to the position shown in Fig. 8.

The operator now momentarily closes switch 296 (Fig. 13), thereby energizing solenoids I2 and IN. If at this time the rack bar 5! is in 1 its rearmost position with stop pin 68 in engagement with stop block 63, the operation of solenoid 12 does not cause any shifting of the rack bar, but if the rack bar is in its intermediate position, as shown in Fig. 3, then solenoid 12, upon being energized, trips the rack bar from the stop block, whereupon spring 66 shifts the rack bar rearwardly until stop pin 66 engages the stop block. By this rearward movement of the rack bar he upper roller 46 is rotated in a counterclockwise direction, whereby any previously severed sheet that may be positionedbetween the two rollers is ejected and dispensed with. 15

Solenoid I6I, which is energized at the same plunger 96, whereupon spring 96 presses driven clutch member 96 into engagement with continuously rotating driving sprocket wheel 66 and the cam shaft H is rotated through one complete revolution, as explained above. During the first portion of the single revolution of the ,cam.

shaft, solenoid I2 is fieenergized due to the angular movement of switch closing cam 294 from arms I22 shift forwardly the table I together with the strip material which is clamped thereto. During the forward movement of the table,

' upper roller 46 is separated from lower roller 46 through the cooperation of cam follower I66 with cam surface I61, thus allowing gripping fingers I49 and I66 to insert the forward end of the strip between the rollers. When the table reaches its foremost position the upper roller drops and the forward end of the strip material is thus clamped between the two rollers. As the upper roller drops into clamping engagement with the strip material, the abutting screws I62 release latches I46, thus permitting leaf springs I63 to release clamp bar I26 from clamping engagement with 39 the strip. 7

Up to this time the cam shaft has been rotated through approximately degrees in a clockwise direction (Figs. 2 and 3) and the crank arms 66 and I24 are now in the angular position in which crank arm 66 is shown in Fig. '2. Upon further rotation of the cam shaft in the same direction, the crank arms recede and thereupon torsion springs I26 move pivoted arms I22 together with the table III rearwardly against stops I25. During the rearward -movement of the table, the forward end of the strip material is firmly clamped between the delivery rollers so that rearward movement of the strip material with the table is prevented.

Simultaneously with the rearward movement of the table, the pivoted arm 11 is moved rearwardly by spring 64, thereby allowing spring 66 to shift rack bar 51 rearwardly from the foremost position in which it is shown in Fig. 2 to the intermediate position in which it is stoppedand held by the engagement of shoulder I6 on the rack bar with stop block 69, as shown in Fig. 3. This initial rearward movement of the rack bar olution of upper roller 46 in a counter-clockwise direction, whereby the strip material is rolled ou or fed forwardly by the rollers so as to position the forward edgeof the strip in close proximity to the winding arbor. This feature of "rolling-out the strip before severing the sheet therefrom is advantageous since it accomplishes the desired result of positioning the severed sheet in close proximity to the coils being wound so that only a small fraction of one revolution of the delivery rollers is necessary to inject the sheet into the coils. Thus, the sheet is very quickly and more positively inserted into the coils. A shelf 362 is, provided on pivoted frame 3| for supporting the extended forward end of the strip in readiness to be injected into th coils.

As mentioned above, the amount of roll-out is determined by the extent of the rearward movement of the rack bar when shifted from its foremost position to its intermediate position,

which may be varied 'by adjusting the striker screw 18 on r'ack actuating arm 'Il. Obviously,

.the roller separating cams 53 (Fig. 10) are so angularly positioned with respect to the upper roller that sufllcient rotary motionof the upper roller, to obtain the desired amount of roll-out and subsequently inject the sheet into the coils, is permitted before high portions 54 of the cams are rendered effective for separating the rollers.

' With the parts proportioned and adjusted as illustrated, the amount of roll-out will be approximately as illustrated by the dotted lines 350 in Fig. 7, which corresponds to a counter-clockwise rotation of the upper roller through approximately 120 degrees. In Fig. 10, the roller separating cam is shown in the angular position it assumes with respect to the upper roller shaft ;when the roller actuating rack bar is in its fore-,

most position. It will be seen that the roller sepiarating cam may be rotated counter-clockwise through approximately 45 degrees beforev the high portion 54 of the cam is rendered effective for separating the rollers. It will be seen, also, that the pin and slot connection 56 permits counter-clockwise rotation of .the. upper roller through approximately 130 degrees without rtating the cam. Thus, the upper roller may be rotated counter-clockwise through a total of approximately 1'75 degrees before the cam is rendered effective for separating the rollers, which is just'suflicient for the amount of roll-out" illustrated and for injecting the sheet into the coils. Upon increasing the amount of "roll-ou without changing the distance between the rollers and the winding arbor, the sheet is caused to be positioned closer to the coils being wound and, therefore, the extent of rotary motion of the rollers required to inject thesheet into the coils is correspondingly decreased, so that the referred to 1'15 degree rotation of the rollers before separation thereof remains sufficient. The amount of rotation of the rollers before separation thereof may be increased beyond the 175 degrees referred to, if necessary, by disengaging the rack bar 51 from pinion 59 and then turning the upper roller together with the roller separating cams 53 in a clockwise direction (Fig. through the number of degrees necessary to permit the additional amount of rotation of the rollers before separation thereof.

After the table In has been retracted to its rearmost position and the rack bar has been retracted to its intermediate position, as described above, upon further rotation of cam shaft 8i, cam I13 through the pantograph leverage mechanism I15 (Fig. 5) effects the operation of the knives I55 to sever the previously advanced portion of the strip from the continuous length. The pantograph leverage mechanism constantly maintains a uniform operative relationship between the knives and the knife operating cam throughout the step-by-step rearward movement of the knives with carriage 31. Before being severed but while it is stationary the continuous strip is firmly clamped to table I I I- by clamp bar I28, which is pressed downwardly by latches I40 actuated by arms I43 which, in turn, are actuated by the fingers I9I on the knife carrying arms I69 (Figs. '7 and 8). The severed end portion of the strip, which is in the form of a separate sheet, is now held in position between the delivery rollers ready to be injected into coils.

As explained above, the cam shaft clutch is automatically disengaged and the cam shaft is anism.

294 is returned to its initial position in which it closes the contacts of switch 292, -as shown in Fig. 13, thus reconditioning the energizing circuit for solenoid 12. This completes the settingup cycle of operation of the sheet feeding mech- Assuming now that the counter has been set or reset so that counter-switch 259 (Fig. 13) is open, stop solenoid 283 isdeenerglzed and contactsflli'are closed, and further assuming that the ends of the several supply wires have been attached to the windingarbor 20, the winding operation is started by starting rotation of the arbor, and the'sheetffeeding mechanism is simultaneously rendered 'active by closing the main control switch 281. Thereafter, upon the completion of each layer of windings, abutment 28I on the reciprocatorytraverse bar 252 will close one or the other of the two switches 280. The closing of either'of these switches, while switch 281 and contacts 255 are closed, establishes energizing circuits for the solenoids I2 and IBI, whereupon the sheet feeding mechanism is operated through one, and only one, complete cycle of operation. Each operating cycle will be substantially the same as the above described "settingup cycle, and it will be apparent that during each operating cycle, with the exception of the setting-up cycle, the delivery rollers will deliver to the coils the sheet which was inserted between the rollers, rolled-out and severed from the continuous strip during the preceding operating cycle. It will be apparent, also, that during each operating cycle the continuous strip is fed forwardly, inserted between the delivery rollers, rolled-out" and then severed, as described above, so that at the end of each operating cycle a newly severed sheet is left positioned between the delivery rollers for delivery into the coils immediately at the beginning of the next succeeding operating cycle. It will be obvious, also, that during each operating cycle the carriage 31 is shifted rearwardly on cam tracks 38 by the mechanism comprising rack bars 201, pinions 205, shaft 255, the spring friction ratchet III! and the ratchet actuating levers and linkage 228- to 234, inclusive, which is operated by one of the table operating arms I22, as illustrated in Figs. 2 and 3 and hereinbefore fully described.

Since the severing mechanism comprising the oscillatory knives I55 and cooperating knife bar I65 are carried by the carriage 31 and therefore are shifted rearwardly with the carriage during each operating cycle, it follows that during each operating cycle the sheet that is severed from the continuous strip is slightly longer than the sheet that was severed during the preceding operating cycle. Thus, the sheets delivered to the coils being wound will be of successively increasing length to compensate for the increasing circumference of the coils with each superimposed layer of windings. As explained above, the extent to which the length of each sheet is increased over the preceding sheet may be varied, according to the gauge of thewires being wound. by adjusting the effective length of spring ratchet operating arm 2" and also by adjusting the stop screw I which determines the extent of the oscillatory movement of arm 225.

The carriage supporting upper edges of cam tracks 3! are upwardly inclinedfrom front to rear, as mentioned above, and the degree of inclina- 'shaft approaches the "at-rest position the cam tion is such that upon shifting of the carriage rearwardly to increase the length of successive sheets as the coils build up on thearbor. the delivery rollers and shelf III are correspondingl elevated to compensate for the increasing diameter of the coils.

Upon the completion of the winding of a "stick of coils. switch Ill (Fig. 13) is closed by the counter, whereby stop solenoid Ill is energized and thus caused to stop the winding arbor and eifect the opening of contacts Ill. The opening of contacts I renders the sheet feeding mechanism .inactive. To insure that this mechanism will remain inactive until the winding of a fresh stick" of coils has been started. switch 281 may be opened. Before starting the winding of a fresh "stick" of coils, the carriage 31 is spring returned to its starting position against stops 2" by pulling out pull rod 245. as explained above. Then switch "I is again momentarily closed. whereby the above described "setting-up cycle is repeated. The counter is then again reset after which the winding operation is started and the sheet feeding mechanism is simultaneously rendered active'by closing the switch 281, as previously described. As the winding of the coils proceeds, the sheet feeding mechanism is operated automatically at the completion of each layer of. windings to deliver a previously severed sheet to the coils for insertion between the superimposed layers of windings, as described above. a

It is to be understood that the invention is not limited to the embodiment thereof herein illustrated and described except insofar as is defined by the appended claims.

What is claimed is:

1. In a sheet material handling mechanism, a sheet delivery roller, reciprocatory means for roso tating the roller, a spring for moving the reciprocatory means in one direction to effect a sheet delivering operation of said roller, stop means for opposing the spring, and electro-magnetic means for rendering said stop means ineflective.

2. In a sheet material handling mechanism, a sheet delivery roller, a reciprocatory driving member for rotating said roller, a spring directly connected to the reciprocatory driving member for moving said driving member in one direction to eifect a sheet delivering operation of said roller, stop means for opposing the spring, means for rendering said stop means ineifective. and means for moving said driving member in the opposite direction.

3. In a sheet material feeding mechanism, a sheet feeding roller, a reciprocatory driving member for rotating said roller, a spring for moving said driving member in one direction to effeet a sheet feeding, operation of said roller, stop means for limiting the movement of the roller in said direction, a second stop means for holding said driving member in an intermediate position against the opp sing force of said spring, means for releasing ths seoond stop means, and means for moving the driving member in the opposite direction to tension the spring.

4. In a sheet material handling mechanism. means for intermittently advancing a continuous strip of sheet material, a sheet severing means mounted for movement longitudinally of the strip, and means comprising a yieldable pantograph leverage mechanism for operating said severing means.

5. In a sheet material handling mechanism, means for intermittently advancing a continuous strip of sheet material, means intermittently operable for severing an end portion of the strip,

means for shifting the severing means longitudinally of the continuous strip to vary the lengths of the severed portions, operating means for said.

severing means, and a pantograph leverage mechanism for operatively connecting said operating means to said severing means. v

8. In a sheet material handling mechanism, means for intermittently advancing a continuous strip of sheet material. means intermittently operable for severing an end portion of the strip. and means comprising a spring friction ratchet mechanism for intermittently shifting said severing means longitudinally of the continuous strip to vary the lengths of the severed portions.

7. In a sheet material handling mechanism, means for intermittently advancing a continuous strip of sheet material, a carriage movable longitudinally of the strip, means mounted on the carriage and intermittently operable for severing an end portion of the strip, means comprising a shaft geared to said carriage for moving the carriage longitudinally of the strip, and a spring friction ratchet mechanism for imparting a stepby-step rotary motion to said shaft.

8. In a sheet material handling mechanism, means for intermittently advancing a continuous strip of sheet material, actuating means for said strip advancing means. a carriage movable longitudinally of the strip, means mounted on the carriage for severing an 'end portion from the strip after each operation of the strip advancing means, means for moving the carriage comprising a shaft geared to the carriage, a spring friction ratchet mechanism for imparting a stepby-step rotary motion to said shaft. and means operated by said actuating means for operating said ratchet mechanism.

9. In a coil winding machine, coll winding means including a coil winding arbor and a reciprocatory wire guide traverse bar, and means for delivering sheet material to a coil while being wound, said last mentioned means comprising a sheet delivery roller, a reciprocatory driving member for rotating said roller, a spring for moving said driving member in one direction to effect a sheet delivering operation of said roller. stop means for limiting the extent of movement of said driving member in said direction, means for moving said driving member in the opposite direction, a second stop means for holding said driving member in an intermediate position against the opposing force of the spring, electromagnetic means for rendering the second stop means ineifective. and means under the control of said wire guide traverse bar for controlling said electro-magnetic means.

10. In a coil winding machine, means for delivering sheet material to a coil while being wound comprising a sheet delivery roller, means for advancing sheet material into operative engagement with said delivery roller. a reciprocatory driving member for rotating the roller, means for moving the reciprocatory member in one direction. spring means for moving said member in the opposite direction to cause said roller to advance the sheet material toward the coil being wound, stop means for limiting said movement of the member under the force of said spring, and means for rendering said stop means ineflective, thereby effecting further movement of said driving member under the force of said spring to deliver the sheet material to the coil, and stop means for limiting the e!- member.

11. In a coil winding machine, means for deliv'ering measured lengths of sheet material to a coil while being wound comprising a pair of sheet delivery rollers, means for inserting between said rollers an end portion of a continuous strip of sheet material, means for rotating one of said rollers to advance said end portion toward the coil being wound, stop means for interrupting the operation of said roller rotating means, means for severing the said end portion from the continuous strip, and means for releasing said stop means to allow said roller rotating means to eiiect a iurther rotation of the roller to deliver the severed portion to the coil.

12. In a machine for delivering measured lengths of sheet material to a coil while being wound, a pair of sheet delivery rollers, a reciprocatory rack bar for driving said rollers, means for moving the rack bar in one direction, a spring for moving the rack bar in the opposite direction, stop means for limiting the movement of the rack bar under the force of said spring, a second stop means for holding the rack bar in an intermediate position against the opposing force of said spring, and means rendered eflective automatically at the completion of each layer of the coil being wound for rendering said second stop means inefiective.

13. In a machine for delivering sheet material to a coil being wound for insertion between superimposed layers of windings, sheet delivery means, means rendered effective automatically at the completion or the winding of each layer of the coil for eflecting a sheet delivering operation or said sheet delivery means, and means for preventing more than one sheet delivering operation of said sheet delivery means for each layer of the coil.

14. In a machine for delivering sheet material to a coil being wound for insertion between superimposed layers of windings, sheet delivery means, means rendered effective automatically at the completion of the winding of each layer of the coil for eflecting a sheet delivering operation of said sheet delivery means, and manually operated means for effecting a sheet delivering operation of said sheet delivery means.

15. In a machine for delivering measured lengths of sheet material to a coil being wound for insertion between superimposed layers of windings, a pair of sheet delivery rollers, one 01 said rollers being mounted for movement toward and away from the other roller, means yieldably urging the movable roller toward the other roller, means for rotating one of said rollers, means rendered effective automatically at the completion of a predetermined amount of rotary motion of said roller for separating the movable roller from the other roller, and means for varying the amount of the said rotary motion required to render the separating means effective.

16. In a machine for delivering sheet material to a coil being wound for insertion between superimposed layers of windings, a pair of sheet delivery rollers mounted for movement toward and away from each other, yieldable means normally urging the rollers toward each other, means comprising a cam coaxially mounted on one of said rollers for separating the rollers, and a. connection between said cam and said roller for allowing a limited rotary motion of said roller with respect to said cam.

17. In a machine for delivering sheet material tent or said nnal movement of the roller driving to a coil being wound for insertion between superimposed layers of windings, a pair or sheet delivery rollers, intermittently operable means for advancing a continuous strip of sheet material andior inserting an end portion of the strip between said rollers, spring actuated means for rotating said rollers in one direction to advance the continuous strip to a position in close proximity to the coil being wound, disengageable stop means for temporarily limiting the rotation of said rollers under the force of said spring actuated means, means for severing the end portion of the strip, and means rendered effective automatically at the completion of a layer of the coil for disengaging said stop means to thereby render said spring actuated means effective for further rotating the rollers to deliver the severed sheet to the coil.

18. In a coil winding machine, coil winding means including a coil winding arbor and a reciprocatory wire guide traverse bar, and means for delivering sheet material to a coil while being wound on said arbor, said last mentioned means comprising a sheet delivery roller, 9. spring for rotating the roller to advance the sheet material toward said arbor, stop means opposing the spring, and means under the control of said wire guide traverse bar for rendering said stop means inefiective.

19. In a coil winding machine, coil winding means including a coil winding arbor and a reciprocatory wire guide traverse bar, and means for delivering sheet material to a coil while being wound on said arbor, said last mentioned means comprising a sheet delivery roller, reciprocatory means for rotating the roller, a spring for moving the reciprocatory means in one direction to eflect a sheet delivering operation of said roller, stop means opposing the spring, means under the control of said wire guide traverse bar for rendering said stop means ineffective, and means for moving the reciprocatory means in the opposite direction.

20. In a sheet material feeding mechanism, a sheet feeding member, a driving element for said. member, a spring for moving said driving 5 ing the movement of said element in said direction, a second stop means for holding said driving element in an intermediate position against the opposing force of said spring, means for releasing the second stop means, and means for moving the driving element in the opposite direction to tension the spring.

21. In a sheet material handling mechanism, means for intermittently advancing a continuous strip of sheet material, actuating means for said strip advancing means, means intermittently, operable for severing an end portion of the strip, means comprising a spring ratchet mechanism for intermittently shifting said severing means longitudinally of the continuous strip to vary the lengths of the severed portions, and means operated by said actuating means for operating said ratchet mechanism.

22. In a sheet material handling mechanism, a severing means, means for advancing an end portion of a continuous strip of sheet material past said severing means, means for operating said severing means to sever the advanced portion from the continuous strip, and means actuated by said severing means for clamping the strip material to said advancing means prior to the severing operation.

23. In a sheet material handling mechanism,

means for intermittently advancing a continuous strip of sheet material, means intermittently operable for severing an end portion of the strip, and means actuated by said severing means for clamping the strip material to said advancing means prior to each severing operation.

24. In a sheet material handling mechanism, means comprising a reciprocatory table for intermittently advancing a continuous strip of sheet material, an intermittently operable oscillatory knife for severing an end portion of the strip, and a clamp bar actuated by movement of said knife for clamping the strip material to said table prior to each severing operation.

25. In a winding machine, a winding spindle, means comprising a reciprocatory member for intermittently advancing an end portion of a continuous strip of sheet material toward said spindle, means for clamping the material to said member, means for releasing said clamping means at the end of each sheet advancing movement of said member, severing means operated after each return movement of said member for severing the previously advanced end portion of the material from the continuous strip thereof, and means actuated by the operation of said severing means for operating the clamping means to clamp the strip material to the material advancing member prior to each severing operation.

26. In a winding machine, a winding spindle, a pair of rollers for delivering sheet material to said spindle, one of said rollers being mounted for movement toward and away from the other roller, means comprising a reciprocatory table for intermittently advancing and inserting between said rollers-an end portion of a continuous strip of sheet material, means for clamping the material to said table, means on said table for separating the movable roller from the other roller to permit insertion of the material between said rollers, means for thereafter moving the movable roller toward the other roller, and means movable with the movable roller for releasing the clamping means during movement of said movable roller toward the other roller.

FRANK MAR'IINDELL.