US1933350A - Automatic dry-cell making machinery - Google Patents

Description

Oct. 31, 1933.

s. SOKOLOW 1,933,350

AUTOMATIC DRY CELL MAKING MACHINERY s sheets-sheet 1 Filed Aug. 13, 1926 amoemboz fliji w Oct. 31, 1933. s. SOKOLOW AUTOMATIC DRY CELL MAKING MACHINERY Filed Aug. 13,3926 6 Sheets-Sheet 2 g Y awuem'toz Get. 31, 1933. 5. SOKOLQW 1,933,350

AUTOMATIC DRY CELL MAKING MACHINERY @c'fc. 311, 1933. s. SOKOLOW AUTOMATIC DRY CELL MAKING MACHINERY Filed Aug. 15, 1926 6 Sheets-Sheet 4 Oct. 31 1933. s. SOKOLOW 1,933,350

AUTOMATIC DRY CELL MAKING MACHINERY ZJ-vwewtoz M, m u

Oct. 31, 1933. so o ow 1,933,350

AUTOMATIC DRY CELL MAKING MACHINERY Filed Aug. 13. 1926 6 Sheets-Sheet 6 Patented oct. 31, 1933 AUTOMATIC DRY-CELL MAKING MACHINERY Samuel Sokolow, New York, N. Y., assignor, bymesne assignments, to Bond Electric Corporation, Jersey City, N. J., a corporation of Dela"- In the manufacture of dry cells for flash lights and the'like a bobbin, as it may be called, is first formed consisting of a cylindrical portion of a matrix composition having a rod-like carbon electrode as a core protruding from one end. This bobbin is then placed within a cup shaped zinc electrode, the electrolyte poured in and the. mouth of the cup sealed about the electrode. It is customary to'wrap the bobbin with 'a fabric before its insertion in the cup in order that no particles of the matrix can be broken off in the process of insertion which would bridge the cup and bobbin and short circuit the cell. The wrapping has heretofore been performed by hand.

The present invention has for its principal object the provision of an instrumentality whereby the bobbin electrode may be automatically wrapped in an expeditious and efiicacious manner. Accordingly a machine is provided through which a plurality of carbon bobbin electrodes may be conducted seriatim and by which a plurality of operations are performed sequentially upon the electrode to produce a wrapped bobbin capable of handling without deterioration. More particularly, an endless convyor conducts the bobbin by a step by step movement to different stations where the several necessary operations are performed. A sheet of fabric of requisite size is first enveloped about the peripheral surface of the bobbin by hand and the enveloped bobbin is then placed in a carrier on the conveyor. During its progress through the machine it is encircled by a cord or thread, the ends folded over with the carbon electrode protruding at one end and the folds at the other end sealed with parafware Application August 13, 1926. Serial No. 129,098

43 Claims.

fine or other congelative medium.

The invention also resides in the several instrumentalities incorporated into the machine as a whole to perform the different operations. Automatic dogging devices are provided which engage the bobbin and fabric wrapping at predetermined intervals and rotate the same as a unit whereby the cord may be caused to encircle the bobbin. Automatic cord engaging and cutting. devices are also provided which engage the end of the cord after the bobbinis encircled thereby and sever the cord, retaining the end until the cord encircling operation upon the succeeding bobbin has commenced. A tamping device is included in the machine which pushes the folds of the fabric about the carbon electrode inwardly against the head of the bobbin and devices are also incorporated to apply liquid sealing material and to fold the ends of the fabric.

In the accompanying drawings, a preferred embodiment of the invention is illustrated, in

which:

Figure 1 is a view, in side elevation, showing the carbon electrode bobbin wrapping machine according to the present invention.

Figure 2 is a plan view of the machine.

Figure 3 is a transverse vertical sectional view taken in the planes indicated by the broken lines 3-3 in Figure 1, looking in the direction of the arrows and showing the dogging devices and actuating mechanism therefor, whereby a bobbin is gripped and rotated to wind a cord thereabout.

Figure 4 is a transverse vertical sectional view taken in the planes indicated by the broken line 44 in Figure 1, looking in the direction of the arrows, and showing particularly devices to apply paraffine while the bobbin'is being rotated to wrap the end of the cord tightly about the electrode.

Figure 5 is a transverse vertical sectional view taken in the plane indicated by the line 55 in Figure 1, looking in the direction of the arrows and showing the tamping and folding devices and the cam actuating devices therefor.

Figure 6 is a detail view in elevation and partly in section showing the cord gripping and cutting devices about to engage the cord after it has been wound about the bobbin.

Figure 7 is a view similar to Figure 6 but showing the relation of parts when the cord is gripped and about to be cut.

Figure 8 is a detail sectional View showing the dogging device at the left hand side of Figure 3 in retracted or open position.

Figure 9 is a detail sectional view showing the tamping device illustrated in Figure 5 in open or retracted position.

Figure 10 is a perspective view showing a bobbin electrode enveloped by a sheet of fabric preparatory to being placed in the machine.

Figure 11 is a similar view of a bobbin about which the thread has been wound and with one fold at one end already made.

Figure 12 is a view in perspective showing the finished article.

Referring first to Figure 10 the bobbin electrode a, as it may be called, composed of the carbon rod electrode a, and the cylindrical matrix bobbin a of a diameter materially greater than the electrode is first wrapped or encircled by hand with a sheet of fabric a of any desired characteristic. Heretofore, all the operations of winding a thread or cord b about the fabric as shown in Figure 11 and folding the one end a and tamping the other end a about the electrode as shown at a in Figure 12 have been done by hand also. These operations may now be accomplished by the machine according to the present invention. The bobbin enveloped by the fabric, as illustrated in Figure 10, is placed in one of the semi-cylindrical carriers 0 mounted on the endless chain c, shown best in Figure 1, which travels through the machine with a step by step movement. Preferably the conveyor 0' is so proportioned that a plurality of carriers 0 may be charged with bobbins in order to insure a continuity of operation, since the enveloping of the bobbins and the placing thereof in the carriers is carried on by hand.

The first station at which a carrier comes to rest is indicated by the roman numeral I in Figures 1 and 2 and there the bobbin and the enveloping fabric are gripped as one, by dogging devices d, D, and rotated while thread B from a reel (not shown) is caused to encircle the fabric to securely hold the same upon the bobbin. After a portion b of the thread B is wound about the bobbin, as shown in Figure 11, the carrier 0 is moved to the station indicated by the roman numeral II, the thread being severed by cutting devices e situated intermediate the two stations, which retain the end of the thread B from the reel preparatory to its application to a succeeding bobbin. At station II the protruding end a of the carbon electrode a is again seized by a dogging device similar to dog D which again rotates the bobbin 'to wind up the severed end b of the thread on the electrode end a with-the aid of a brush 1 while the outer surface of the opposite end a of the fabric protruding beyond the end a of the bobbin has applied thereto an adhesive such as parafline. At station III one fold a, in the end of the fabric is made over the end of the bobbin by means of the fold making arm g as shown in Figure 11. The carrier is next moved to station IV and during this movement the remaining folds a, (1 and a of the fabric are made over the end of the bobbin, as illustrated in Figure 12, by means of a plurality of irregular folding edges g formed in a folding plate g extending between stations III and IV. At station IV the end a of the fabric, which has been crumpled about the carbon electrode a. by the string b as shown at a is tamped inwardly against the end a of the bobbin as illustrated at the rear end of the structure shown in Figure 12 at a by means of a tamping device is. Between station IV and station V the folded end is flattened by means of the plate g against which the end a of the bobbin engages while at station V the bobbin is caused to turn within the cylindrical carrier to permit a die h to smooth or merge the sharp corners of the folds into the cylindrical surface. The completed bobbins are then removed as the conveyor reaches the end of its forward travel.

Power to operate the machine is taken from any convenient source. In the illustrated embodiment a chain 2' from, say, an electric motor, not shown, rotates by the sprocket wheel 2" a transversely extending power shaft 2' journaled in the upstanding end frame 7' supported from the base 7" of the machine. Step by step rotation of the endless conveyor chain c is effected from the power shaft 2' in .the following manner: The power shaft 1' carries a Worm i which meshes with a worm wheel 1' mounted on a cam shaft 7" extending longitudinally below the power shaft for the length of the machine and journaled at the left hand end (as viewed in Figure 1) in the end frame 7' and at the other end in a bearing 7' formed on the end frame machine i at the right hand end of the base 7". On the end of the cam shaft r there is a bevel pinion r meshing with a bevel gear I on a cross shaft 2' carrying the actuating members for a Geneva wheel m by which the driving sprocket c for the endless conveyor chain c is turned. The cross shaft Z carries an arm Z upon which the actuating pin Z for the Geneva wheel m is mounted and also the disc Z on which is formed the locking surface 1 for the Geneva wheel. The Geneva wheel and the driving sprocket are carried by a parallel shaft m immediately above the cross shaft also journaled in the end frame member 7' At the left hand end an idler sprocket 0 is carried on a shaft 0 journaled in an extension 7' of a longitudinally extending frame 7 mounted along the rear of the base a" and supporting the various mechanisms performing the different operations.

It will be observed, in the illustrated embodiment, that the idler sprocket c is so spaced from the first station (station I) 'as to permit three carriers to be in charging position while a fourth is at station I. Thus the operator of the machine has. ample opportunity to envelop bobbins and place them in the carriers while the various operations continue uninterrupted.

A bobbin a properly enveloped with a piece of fabric a is placed in one of the carriers with the end of the carbon electrode abutting against the guide plate i along which it slides. In due course that bobbin reaches station I. So soon as the carrier is in position, the Geneva wheel m is locked by the surface Z of the disc Z and the opposed dogging devices d, D, are caused to engage the bobbin and -fabric as a unit. Up to this point the dogging devices have been in inoperative position as shown in Figure 8. The operation of both the devices (1 and D is identical. Their several like parts are indicated by like exponents while the reference characters for the device on the right in Figure 3 are capitalized. The two devices differ only in that dog at is adapted to engage the bobbin end while dog D engages the carbon electrode end. Therefore the spindle d is of a diameter equal to the diameter of the bobbin while the spindle of the dog D is of a diameter equal to the core. As the carrier comes to rest the cam surface 11 formed on the cam disc 11 moves out of contact with the wheel d carried on a slide d reciprocal on the cam shaft 1" and connected by a link cl to the arm (1 of a lever d pivoted on the end frame member a at d the lever is connected with the spindle d. This releases the roller d and permits the spring d, to move the mandrel d to the right within the protruding cylindrical and a of the fabric to abut against the end a" of the bobbin. This movement is permitted because the left hand end of the spring abuts against a collar or sleeve al threaded (and secured by a set screw d) on the end of a rotatable hollow mandrel d concentric with the spindle d but prevented from axial movement by the collar (1 and a shoulder (Z between which the hollow spindle d is journaled in a bearing 7' in the end frame member 7'. As the spindle d is advanced by the spring d it carries with it an annular head d concentric with the hollow spindle by reason of the pin d" which slides in the slots d in the end of the hollow spindle (Z The outer end of this The other arm d of head d is closed by a ring d which together with an irregular surface d on the head (1 forms a cam surface orannular groove or recess which receives one arm at of each of a plurality of V-shaped gripping elements d so that when the head is slid forward the gripping arms 11 are rotated downwardly about the pivots 11 to clamp the end a of the fabric against the spindle d. Identical movements occur in connection with the dogging device D. The controlling cam in this instance is indicated at D Here the arms D crumple the end a of the fabric about the protruding end a of the core a as shown in Figure 11 at a The spindle (not shown) does not protrude to the plane of the ends of the jaws but abuts against the end of the core which extends within the jaws D.

As the gripping arms D engage the core a they clamp against the core an end of a cord or string B lead from a reel (not shown) supported above the machine. The two gripping devices d and D are then rotated in unison while a thread feeding device 11 travels the length of the bobbin to cause the thread to be wound thereabout as shown at b in Figures 11 and 12.

The rotation of the dogging or gripping devices will first be described. The hollow spindles d and D are rotated in unison from the power shaft 1' for a predetermined period in the following manner: Both hollow mandrels carry gears (1 D respectively, which mesh with gears (Z D rotating with stud shafts (1 D parallel to the power shaft and having bearings, respectively, in the frame members 7' and 1 The stud shafts turn as one through a loose coupling d which is provided therebetween to facilitate assembly. Stud shaft (Z is selectively rotated from the power shaft. A gear 2' on the power shaft meshes with a gear d -loose on the stud shaft d but capable of being connected thereto for rotation by a power press clutch 41 As the gripping operation is completed a cam surface d on a cam disc (1 comes into contact with a roller d on an arm d pivoted to the end frame a forcing the end (1 downwardly to retract the plunger d against the action of the spring (1 thereby permitting the finger d to enter the receiving notch d in the loose coupling member (1 carried by the gear 11 and as the co-operating coupling member d is keyed on the shaft 11 the gear c1 turns the hollow spindle (Z and similarly the gears D and D turn hollow spindle D. The cam surface 11 is so proportioned that the plunger 11 is retracted while the spindles make a predetermined number of revolutions to effect that number of turns of cord about the bobbin, in this instance 16. After the spindle has completed its sixteenth revolution the spring (Z acting on the pin (11 forces the plunger again into engagement with the inclined surface 11 on latch d", the plunger causing the retraction of the latch and preventing further rotation of the spindle while the loose gear runs free on the stud shaft. Supplementing the action of the locking plunger (1 the stud shaft 11 may be equipped with a friction retarding band 11.

The thread feeding device n is actuated simultaneously with the revolution of the dogging devices d and D. The end of the thread is retained by a gripping and cutting device indicated in general at e. It is led from a reel, not shown, over idler rolls n carried with the thread feeding device n and is clamped by one of the jaws D against the core a of the bobbin. The bobbin is then rotated several times by the dogging devices laying several turns of the thread about the core as at D in Figure 11, after which the thread feed is moved across the face of the bobbin while the bobbin continues to turn to form some of the helical turns b This movement of the feed n is effected througha cam n in the following manner: The feed is on a slide n reciprocal in a guiding portion 7' formed in a bearing portion of the rear frame members 7' by means of a lever 11, pivoted on the bracket 7' also carried with the frame and oscillated about its fulcrum in one direction by the spring 11. and in the opposite direction by a lever u which is oscillated by the cam 11' reciprocating the slide n. Thus while the cam n turns in contact with the roller 12. on the feed slide a between say the points 11 and n on the cam disk the feed n is stationary in the position shown in Figure 2 and two turns of the thread are wound about the core. Then as the cam surface 11, to 11 contacts with the roller the slide n is moved gradually to the left as viewed in Figure 4, causing the feed to travel across the face of the rotating bobbin and lay several helical turns b thereabout. Between the limits of the dwell n -n the feed is held stationary thereby causing the two parallel turns b about the end of the bobbin. Thereafter the reduction in the cam between the points 11 -12 permits the spring n to retract the slide to cause another helical turn I) about the bobbin until the cord again lies over the core whereupon several more turns are made thereabout.

At this point the rotation of the dogs ceases, the spindles are retracted and the jaws release the bobbin. At this instant the dwell n comes into contact with the roller to cause a momentary progression of the feed in a downward direction as viewed in Figure 2 to move the string clear of the jaws and the conveyor moves one step forward to bring the bobbin to station II.

During the movement, the gravity latch e is tripped by the core a contacting with the downwardly projeciing arm e as shown in Figure 6, allowing the lower jaw e to fall or drop downwardly under the action of the tension spring e. A second slide e drops downwardly under the action of the spring e As the feed 11. returns to initial position after the roller n rides off the dwell 71 the cord is moved within the jaws. So soon as the bobbin comes to rest at station II the thread cutting cam c (Figure 4) causing the movement to the left of the link 6 to break the toggle joint e and causing the slide c to travel downwardly so that the pin e strikes the end of the lever e and raises the plunger e The plunger e has associated therewith the second slide e formed with the lower jaw e and both of the slides are slidable in a guide 7 formed in a projecting portion 9' of the frame. The plunger e is recessed as at e to form the shoulder e and to receive the slide e and a stop or pin e limits its downward movement by engaging the shoulder e Similarly a s op e projecting within the recess 6 of slide e limits the movement of this slide in both directions. As the plunger e is raised sharply upon the blow of the pin e the jaw e raises the slring b and clamps it against the upper jaw e upon the slide e whereupon both jaws and the string b therebetween are raised simultaneously against the action of the springs e and e until the shoulder e abuts against the pin e As both jaws continue to raise together within the guide 7 the cord 1) is brought into contact with the knife edge c and severed. The cord is shown in Figure 7 about to be severed. It will be observed that in Figure 7 the gravity latch e has fallen so that the toe e is beneath the jaw e whereby the end of the thread from the reel is retained clamped between the jaws preparatory to the winding operation upon a subsequent bobbin similar to that just described.

As the cord is being cut the core of the bobbin is being gripped by a dogging device D similar in every respect to the dogging device D and located at station II which is thereupon rotated in unison with the dogging device D through the gears D and D4 which are in mesh with an intermediate idler D The rotation of the bobbin at this station causes the loose end h of the string to be wrapped around the endwz of the core by means of a wire brush 1 which brushes the core in this position. At this station the outer surface of the projecting fabric portion 01. comes into contact with a roller 0 turning constantly in a bath 0' of adhesive, in this instance molten paraifine. The temperature of the bath is maintained at the desired point by any suitable heating means, electrical or otherwise. The roller 0 is shown as turned constantly by a belt 0 from the cross shaft Z.

The engagement and release of the core by the jaws D also occur simultaneously with the jaws B. These movements are intiated by the same cam D. It will be observed that the upper end of the lever D carries a yoke D whereby both spindles are reciprocated simultaneously as will be understood.

When the dogging device D releases the bobbin, the carrier moves it to the next station (III). Here one fold a. of the end of the fabric is folded inwardly against the end a of the bobbin by the fold forming lever 10 which is rotated periodical ly about its pivot 10' by the link p connected to and reciprocated by the tamping mechanism k to be described hereafter.

After the fold a is made the carrier conveys the bobbin to station IV. In passage between stations III and IV the unfolded portions of the fabric end a pass between the inclined walls g of an elongated guide or plate 9' wherein the folds a and a are folded against the end of the bobbin and then the flap a is folded thereover by the inner face of the plate 9 When the bobbin reaches station IV the crumpled ends a of the fabric (Figure 11) are tamped inwardly against the end face a of the bobbin as shown at a. This is effected by a pair of jaws k which are caused to close upon the core and then given a movement of translation by the cam and lever mechanism shown in Figure-5. The camming surface k of the cam k bearing upon the roller k causes the movement to the right of the slide or link k rocking the lever 70 about its fulcrum k to cause a sliding movement to the left of the tamping structure k within the guide :1 in the frame and a corresponding movement of the link p previously described. Reciprocation of the tamping structure and the linkp to the right after the folding and tamping operations are completed is permitted by the dwell k on the cam disk under the influence of the coil spring 70 The operationof the tamping device is best illustrated in Figure 9. Within the bearing 9' formed in the frame 7' and retained by the hold down plate 7' there are reciprocable as a unit a pair of separate plates 70 recessed at their ends as at k to form the hooks 70 These plates are shown as riveted to an H-shaped bearing K with which the upper end k of the lever k engages, the upper end of the lever also carrying a pin is", Fig. 2, by which the link p is connected thereto. Within the bearing is a pair of stationary wear plates 10 is, one of which 70 carries a stop or pin it, Figure 9, extending between the plates k Between the plates la is a slide I0 The inoperative or retracted position of the tamper is shown in Figure 9. When the tamping of the bobbin is to be effected, the end Id of the lever is moved to the left as viewed in Figure 9 through the instrumentality of the cam as has been explained. This causes a movement to the left of the plates k but the slide k is retained relatively stationary by the spring is which is disposed within a recess k formed in the slide between the stop It carried on the stationary plate Je and the end wall k: of the recess 70 This relative movement between the plates k and the slide it causes the jaws k to approach one another to engage the end a of the core as the lugs 10 on the jaws 7c are off center with respect to the pivots k and extend within the recesses k. This relative movement brings the H-shaped bearing is" in contact with the end 11cc wall k of the slide and further movement of the end of the lever to the left projects the plates is and slide 71: as a unit against the action of the spring 7c" thus sliding the jaws along the core to tamp the crumpled end e of the fabric and the coiledv string b tightly against the end wall a of the bobbin. This tamping action also serves to flatten the folds a a and a against the other end of the bobbin by pressing that end against the inner face of the wall or flange g 11*? forming the continuation of the folding plate g. The release of the core is effected by a movement the converse of what has just been described and is thought to be obvious.

It sometimes happens that when the end of the fabric is folded over the end of the bobbin small corners formed by the folds project laterally beyond the peripheral marginal surface of the bobbin. A die h is therefore provided which takes the form of a roller constantly driven by a belt h from the cross shaft 1 and provided with a friction surface it which engages the peripheral surface of the bobbin and causes its rotation within the carrier and an angular cam surface h which irons down the projecting corners and merges them into the cylindrical surface of the bobbin. A scraper i is shown secured to the frame and adapted to clean off any congealed wax which may collect on the die.

It will thus be seen that a machine has been provided wherein the various operations necessary to the wrapping of the bobbin electrodes for dry cells may be carried on automatically.

Various modifications may be made in the different instrumentalities going to make up the machine as a Whole as well as in the combinations thereof to perform the several steps necessary to a completely wrapped bobbin electrode. It is to be understood that the several instrumentalities may be used individually or in combination with 140 one or more others and no limitation is intended by the phraseology of the foregoing specification or illustrations in the accompanying drawings except as set forth in the appended claims.

What I claim is:

1. In a machine for wrapping bobbin electrodes, a bobbin gripping device comprising a mandrel, a hollow mandrel concentric therewith formed with radial elongated slots at one end, a spring to cause relative movement between the man- 15 drels, V-shaped levers pivoted in the slots, respectively, a substantially cylindrical head concentric with the hollow mandrel formed inwardly with an annular groove for the reception of one arm of each of the levers and means to cause the first named mandrel and the head to move as a unit.

2. In a machine for wrapping bobbin electrodes, a bobbin gripping device comprising a mandrel having a shoulder, a hollow mandrel concentric therewith formed with a plurality of slots at one end and an inwardly directed flange at the other end, a coil spring between the shoulder and the flange, V-shaped levers pivoted in the slots, respectively, a substantially cylindrical head concentric with the hollow mandrel and formed with an annular recess to receive one arm of each of the levers, a pin extending between the first named mandrel and the head and passing through the slots, means to cause relative movement of the mandrels against the action of the spring and means to rotate the device.

3. In a machine for wrapping bobbin electrodes, in combination, a power shaft, a drive shaft, operative connections between the power shaft and the drive shaft including a clutch, a cam shaft, operative connections between the power shaft and the cam shaft, a cam, a clutch actuating element operated by the cam, a bobbin electrode gripping device, a second cam, means to actuate the gripping device from the cam and means to rotate the gripping device from the second cam.

4. In a machine for wrapping bobbin electrodes, in combination, a support for a bobbin electrode, a power shaft, a drive shaft, operative connections between the power shaft and the drive shaft including a clutch, a cam shaft, operative connections between the power shaft and the cam shaft, a plurality of cams, means to actuate the clutch from one cam, bobbin electrode gripping devices at opposite ends of the support, means to operate the gripping devices from other cams, respectively, and means to rotate the gripping devices from the drive shaft.

5. In a machine for wrapping bobbin electrodes the combination with the frame, of a power shaft, a drive shaft, a gear keyed to the power shaft, a gear meshing with said gear and loose on the drive shaft, a clutch to cause the drive shaft to turn with the gear, a cam shaft, worm gearing between the power shaft and the cam shaft, a plurality of cams on the cam shaft, a clutch releasing plunger operated by one of the cams, a conveyor for the bobbin electrodes, gripping devices disposed upon opposite sides of the conveyor comprising, respectively, a mandrel having a shoulder, a hollow mandrel concentric therewith, rotatable in a bearing in the frame, and formed with radial slots and a shoulder at one end and threaded at the other end, a sleeve formed with an inwardly directed flange threaded on the end of the hollow mandrel, a coil spring between the shoulder on the first named mandrel and the flange, V-shaped levers pivoted in the slots, respectively, a substantially cylindrical head concentric with the slotted end of the 1'10]: low mandrel and formed inwardly with an annular recess to receive one arm of each of the levers, a pin extending between the first named mandrel and the head and passing through the slots, levers pivoted between their ends on the frame and connected at one end to the first named mandrel of each gripping device, links connected with the other ends of the respective levers and tive ends of a bobbin electrode and a thread at one end thereof, a thread feeding device, means to move the thread feeding device axially of the bobbin electrode, means to rotate the gripping devices, a thread gripping device, a thread cutting device, a second gripping device, means to rotate the second gripping device, means to wind the cut end of a thread about the bobbin, means to apply a congelative material to one end 01' the wrapping of the electrode, means to fold the end of the wrapping, and means to tamp theencircling end of the cord and wrapping about the core of the bobbin electrode.

7. In a machine for wrapping bobbin electrodes, a thread gripping device comprising a plunger formed with a jaw and a recess, a stationary pin entering the recess, a slide formed'with a co-opcrating jaw and a recess and reciprocable in the first named recess, a stationary pin entering the second named recess and means tending to retain the slide against the second named pin.-

8. In a machine for wrapping bobbin electrodes, the combination with a frame, of a thread gripping device comprising a plunger, slidable in the frame, formed with a jaw and a recess, a pin seated in the frame and entering the recess, a slide formed with a jaw and a recess disposed within the first named recess, a pin seated in the frame and entering the second named recess, a coil spring disposed between the slide and the first named pin and a tension spring between the plunger and the frame.

9. In a machine for wrapping bobbin electrodes, the combination with the frame, of a thread gripping and cutting device comprising a plunger, slidable in the frame, formed with a jaw and a recess, a slide formed with a co-operating jaw and a recess and slidable in the first named recess, pins seated in the frame and entering the recesses, respectively, a coil spring between the slide and the pin in the first named recess, a tension spring between the frame and the plunger, a knife edge adjacent the plunger, a gravity latch pivoted on the frame to retain the jaws in thread gripping relation and means to trip the latch.

10. In a machine for wrapping bobbin, electrodes with a fabric, means to crimp the fabric and clamp the end of a thread against the core electrode of the bobbin, means to retain the relative position of the wrapping with respect to the bobbin, means to rotate the bobbin and means to wind a thread about the bobbin.

11. In a machine for wrapping bobbin electrodes, a thread gripping device comprising a plunger formed with a jaw and a recess, a stationary element entering the recess, a slide formed with a co-operating jaw and a recess and disposed in the first named recess, a stationary element entering the second recess, means tending to separate the jaws and gravity means to close the jaws.

12. In a machine for wrapping bobbin electrodes, a thread gripping device comprising a reciprocable member formed with a jaw, a mem ber formed with a jaw relatively movable with respect to the first named element and gravity means to retain the jaws in closed position.

of a plunger reciprocal in the frame and formed with a jaw, a slide formed with a jaw, resilient means to advance the slide, means to limitthe movement of the slide, means to limit the movement of the plunger, resilient means to advance the plunger and means to retain the jaws in closed position.

14. In a machine for wrapping bobbin electrodes, the combination with a stationary frame, of a plunger slidable in the frame formed with a shoulder and a jaw, a stop with which the shoulder contacts, a slide reciprocal in the frame formed with a co-operating jaw and opposed shoulders, a stop co-operating with said last named shoulders to limit the movement of the slide in both directions, means to separate the jaws, and means to retain the jaws in closed position.

15. In a machine for wrapping bobbin electrodes, the combination with a frame, of a thread gripping and cutting device comprising a pair of separable and reciprocable jaws, means to normally retain the jaws-in open position, means to close the jaws, gravity means to retain the jaws in closed position, a knife edge, means to move the jaws and knife edge relative to one another and means to release the gravity means upon predetermined movements of the bobbin.

16. In a machine for wrapping bobbin electrodes, the combination with a frame, of a thread gripping device comprising a plunger slidable in the frame formed with a shoulder and a jaw, a stop with which the shoulder contacts, a slide reciprocable in the frame formed with a cooperating jaw and opposed shoulders, a stop with which the opposed shoulders contact, resilient means to advance the plunger and the slide, respectively, means to retract the plunger to close the jaws and gravity means to retain the jaws in closed position.

17. In a machine for wrappin bobbin electrodes having a frame and a bobbin conveyor, a

- thread gripping and cutting device comprising a plunger slidable in the frame formed with a shoulder and a jaw, a stop on the frame with which the shoulder contacts, a slide reciprocable in the frame formed with a co-operating jaw and a recess, a stop on the frame within the recess, a coil spring between the first named stop and the slide, a knife edge, a tension spring between the frame and the plunger, a gravity latch to maintain the jaws in closed position, a shoulder on the latch for engagement by a bobbin on the conveyor. a lever pivoted on the frame and connected by one arm to the plunger, and a cam actuated trip engaging the other arm of the lever.

18. In a machine for wrapping bobbin electrodes, a tamping device comprising tamping jaws, means to move said jaws laterally into and out of operative relation with respect to the elsetrode core of a bobbin electrode, and means to give said jaws a movement of translation when in operative relation with the electrode core.

19. In a machine for wrapping bobbin electrodes, a tamping device comprising a slide, tamping jaws pivoted on the slide, means to move said jaws laterally into and out of operative position,

and means to reciprocate the slide when the jaws are in operative relation with the electrode core.

20. In a machine for wrapping bobbin electrodes, a tamping device comprising a slide, at least one tamping jaw pivoted on the slide, operating means to pivotally swing each jaw, means to actuate the jaw operating means. and means to reciprocate the slide when the jaws are in operative relation with the electrode core.

21. In a machine for wrapping bobbin electrodes, a tamping device comprising a reciprocable slide, at least one tamping jaw pivoted on the slide, a jaw operating member relatively movable with respect to the slide to pivotally swing the jaw, means to limit the reciprocation of the slide, and means to move the slide and member.

22. In a machine for wrapping bobbin electrodes having a frame formed with a bearing, a tamping device comprising a slide reciprocal in the bearing, tamping jaws pivoted on the slide and formed with lugs off center with respect to the pivots, jaw operating members on opposite sides of the slide within the bearing and formed with recesses to engage the lugs on the jaws, means to yieldingly retract the slide, a stop to limit the retraction of the slide and means to advance the slide and members.

23. In a machine for wrapping bobbin electrodes having a frame element formed with a bearing, a tamping device comprising a slide reciprocable in the bearing and formed with opposed shoulders, tamping jaws pivoted on the slide and formed with lugs 01f center with respect to the pivots, jaw of members on opposite sides of the slide within the bearing and formed with recesses to engage the lugs on the jaws, a stop on the frame for engagement with one of the shoulders, a coil spring between the stop and the other shoulder, and means to reciprocate the meers and means to advance the slide after a predeteed movement of the members.

.241. In a chine for wrapping bobbin electrodes having a frame element formed with a bea, a tamping device comprising a slide reciprocable in the bearing and formed with opposed shoulders, tamping jaws pivoted on the slide and formed with lugs ofi center with respect to the pivots, jaw operating members on opposite sides of the slide within the bearing and formed with recesses to receive the lugs, respectively, a stop on the frame for engagement by one of the shoulders, a coil spring between the stop and the other shoulder, a yoke connecting the jaw operating members having a surface to engage the slide after a predetermined movement of the members, a lever to reciprocate the members, a cam to rotate the lever and spring means to oppose the action of the cam.

25. In a machine for wrapping bobbin electrodes, the combination with a conveyor for a bobbin electrode, of a rotary smoothing die including means to rotate the bobbin and means to flatten folded corners of the wrapping on the periphery of the bobbin.

26. In a machine for wrapping bobbin electrodes, in combination, a conveyor. means to advce the conveyor with a step by step movement, means to encircle a cord about the bobbin, means to tamp the fabric wrapping and cord about the core and means to fold the fabric over the end of the bobbin.

27. In a machine for wrapping bobbin electrodes, in combination, an endless conveyor, carriers fora bobbin disposed at predetermined intervals, means to advance the conveyor with a step by step movement, means to rotate the bobbin, thread feeding means, means to move the feeding means relative to the bobbin, tamping means and means to fold the fabric over the end of the bobbin.

28. In a mace for wrapping bobbin electrodes, in combination, an endless conveyor, carriers for bobbins disposed at predetermined intervals, means to advance the conveyor with a step by step movement, means to grip an end of a cord and the fabric and core of the bobbin at one end, means to engage the bobbin, means to grip the fabric at the other end, means to rotate said means synchronously, thread feeding means, means to give said feeding means a predetermined movement of translation with respect to the bobbin, cord gripping and cutting means, tamping means and means to fold the end of the fabric over the end of the bobbin.

29. In a machine for wrapping bobbin electrodes, in combination, a conveyor, means to encircle a cord about the bobbin, cord gripping and cutting means, tamping means, adhesive applying means and a folding device comprising a lever arm to form the first fold, means to rotate the lever, and a plurality of non-parallel stationary guiding edges to form the remaining folds.

30. In a machine for wrapping bobbin electrodes, in combination, a conveyor, means to encircle a bobbin with a cord, cord gripping and cutting devices comprising a pair of jaws, means to retain said jaws normally in open position, means to close said jaws at predetermined intervals, thread cutting means and means operable by the bobbin to release the jaws, tamping devices and means to fold the fabric over the end of the bobbin.

31. In a machine for wrapping bobbin electrodes, in combination, a conveyor, means to encircle a bobbin with a cord, cord gripping and cutting devices, tamping devices including a slide, tamping jaws pivoted on the slide, a jaw operating member, means to actuate the jaw operating member and means to actuate the slide, and means to foldthe fabric over the end of the bobbin.

32. In a machine for wrapping bobbin electrodes, in combination, a conveyor, means to encircle a bobbin with a cord, cord gripping and cutting devices, adhesive applying devices, tamping devices including a reciprocable slide formed with opposed shoulders, tamping jaws pivoted on the slide and formed with eccentric lugs, jaw operating members on either side of the slide formed with recesses to receive the lugs, a stop to engage one of the shoulders, a spring bearing against the other shoulder, means to reciprocate the jaw operating members and means to advance the slide after a predetermined movement of the members and means to fold the fabric over the end of the bobbin.

33. In a machine for wrapping bobbin electrodes, in combination, a conveyor, means to encircle a cord about the bobbin, cord gripping and cutting devices including a slidable plunger formed with a shoulder and a jaw, a stop with which the shoulder contacts, a reciprocable slide formed with a co-operating jaw and opposed shoulders, a stop between the opposed shoulders, resilient means between the first named stop and shoulder, a knife edge, means to move the plunger relative to the knife edge, resilient means to oppose said movement and gravity means to retain the jaws in closed position and operable to release the jaws by the bobbin, tamping devices and means to fold the fabric over the end of the bobbin.

34. In a machine for wrapping bobbin electrodes, in combination, a conveyor having a step by step movement, means to grip an end of .a-

cord and the fabric and core, means to engage the other end of the bobbin and grip the edge of the fabric, means to rotate said means synchronously, cord feeding means, means to give said feeding means a predetermined movement of translation wiih respect to the axis of the bobbin, means to grip the core of the bobbin, means to rotate said last named means, cord gripping and cutting devices, means to wind the cut end of the cord about the core of the bobbin, means to apply molten paraifine to the fabric, means to fold the fabric over the end of the bobbin, and tamp-- ing devices.

35. In a machine for wrapping bobbin electrodes which move through the machine, the combination with a frame, a pair of jaws carried thereby, means to close the jaws to grip a thread, and a latch retaining the jaws in closed position, the latch being released by the moving bobbin to open the jaws.

36. In a machine for wrapping bobbin electrodes which move through the machine, the combination with a frame, a pair of jaws carried thereby, means to close the jaws to grip a thread, a latch retaining the jaws. in closed position, and means carried by the latch in the path of the moving bobbin which releases the latch to open the jaws.

37. In a machine for wrapping bobbin electrodes which move through the machine, the combination with a frame, a pair of jaws carried thereby, means to close the jaws to grip a thread, a pivoted latch swingable by gravity to retain the jaws in closed position, the latch being in the path of the movable bobbin which releases it to open the jaws.

38. In a machine for wrapping bobbin electrodes having an electrode core, a support for a bobbin electrode having a fabric wrapped thereabout and extending beyond the ends thereof, jaw means clamping the projecting fabric about the electrode core, cylindrical means to engage the other end of the bobbin electrode and jaw means to clamp the ends of the fabric wrapping therewith retaining it in its cylindrical form, means to rotate both clamp means to revolve the bobbin, cord feeding means and means to give said feeding means a movement of translation with respect to the axis of the bobbin.

39. In a machine for wrapping bobbin electrodes having an electrode core protruding from one end and a fabric extending beyond both ends thereof, in combination, means adapted to fold the end of the fabric about the core, means to clamp a cord and the wrapping against the protruding core at one end of the bobbin, means for winding a cord about the core over the folded fabric, means moving the winding mechanism longitudinally of the bobbin in both directions with a dwell adjacent the end thereof to form spiral windings in both directions thereupon with one winding overlying the other winding and to form a plurality of circular turns upon the end of the bobbin adjacent the end thereof and to terminate the windings about the core and over the folded fabric and means to secure the ends of the cord at the protruding core.

40. In a machine for wrapping bobbin electrodes, a bobbin gripping device comprising a mandrel, a hollow mandrel concentric therewith, gripping levers pivoted on the hollow mandrel, a sleeve concentric with the hollow mandrel and movable to depress the levers, means to advance the mandrel relative to the hollow mandrel and means to move the sleeve with the first named mandrel to cause the levers to engage said mandrel.

41. In a machine for wrapping bobbin elec trodes, a bobbin gripping device comprising a reciprocable spindle, means to advance the spindle into contact with the end of the bobbin, a hollow mandrel concentric therewith, gripping ;laws carried in the hollow mandrel, means carried with the spindle to cause a movement of the jaws to closed position upon advance of the spindle into contact with the bobbin and means to rotate the hollow spindle.

42. In a machine for wrapping bobbin 81801,.-

trodes having a fabric wrapping extending over both ends thereof, a gripping device to engage the core of the bobbin and clamp the fabric wrapping thereabout, means to rotate the gripping device, a thread feeding device, means to give the feeding device a movement of translation with respect to the axis of the bobbin and means for completing the folding of the wrapping about the article, comprising successively operating means for folding successive segments of the neeasso and thread to thereby clamp the end of a thread and the fabric about the protruding end of the core electrode of the bobbin, means to rotate the gripping device, a thread feeding device, means to give the feeding device predetermined movements of translation with respect to the axis of the bobbin and successive means to fold successive segments of the fabric at the bottom of the bobbin in a plurality of flat overlapping folds against the flat bottom of the bobbin.

SAMUEL SOKOLOW.'

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