US2003354A - Machine for applying a web to a strand - Google Patents

Description

June 4, 1935. c. B. FANTONE Er AL 2,003,354

MACHINE FOR APPLYING A WEB TO A,STRAND Filed Aug. 23, 1934 5 Sheets-Sheet 1 mi (TW 5 R Y U E E M W EEG 0 W3 w 1M0 A mm W CfY B June c. B. FANTONE ET AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 23, 1934 5 Sheets-Sheet 2 INVENTOR; c/mr/efi B fZmfOne dwar'd G. Parwn BY Q TT NEYS.

June 1935- c, B. FANTONE ET AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 23, 1934 5 Sheets-Sheet 3 INVENTORF le Edward G. Far-win ZQQRNEYS.

June 4, 1935. c B FANTONE r AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 2:5, 1934 5 s eetssheet 4 Saving l'kall INV NTO Charles .Fan m Ed ar G. Per BY Q TaKC-UP ATTORNEY-5 J1me 1935- c. B. FANTONE ET AL 2,003,354

MACHINE FOR APPLYING A WEB TO A STRAND Filed Aug. 25, 1934 5 Sheets-Sheet 5 98 INVENTORE C/mrizs B [T I gi G. Fir-v1}:

ATTORNEY5.

Patented June 4, 1935 PATENT OFFICE MACHINE FOR APPLYING A WEB TO A STRAND Charles B. Fantone, Ly'ndhurst, and Edward G.

Parvin, Roselle, N. J.,

chine Company, Newark,

of New Jersey Application August 23,

19 Claims.

This invention relates to improvements in machines of the type employed for wrapping a narrow web or tape of insulating or similar material about 'a longitudinally moving strand or cord in the form of a helical rod composed of abutting or overlapping turns.

One of the objects of the invention is to provide an improved and automatic form of brake for the cop and cop spindle of such machines which acts to immediately bring the cop to a dead stop when the web breaks.

A further object of the invention is to provide in conjunction with the above mentioned brake a brake for the serving head upon which the cop is mounted to likewise bring it to a dead stop when the web breaks.

A further object of this invention is to provide an automatic switch which operates to closed position when the web breaks to stop the machine and energize both of said brakes.

These and many other objects, as will appear from the following disclosure are secured by means of the structure which comprises this invention.

This invention resides substantially in "the combination, construction, arrangement and relative location of parts, all as will be fully described below.

In the drawings,

Fig. 1 is a vertical, central, cross sectional view of a serving head to which the herein disclosed invention is applied, showing some parts in elevation;

Fig. 2 is a top plan view thereof with some parts broken away;

Fig. 3 is a cross sectional view through the commutator;

Fig. 4 is an enlarged vertical, central, cross sectional view through the cop spindle showing the automatic cop spindle brake in elevation;

Fig. 5 is a top plan view of the automatic switch and cop spindle brake showing the shaft in cross section; I t

Fig. 6 is a cross sectional view taken on the line 66 of Fig.5; 1

Fig. 7 is a cross sectional view taken on the line 1-l of Fig. 5;

Fig. 8 is a diagrammatic view of the circuit connections for a complete machine of which the serving head is a part, and shows the connection of the various parts in a system in which both commutator rings of the serving-head are employed;

' Fig. 9 is a diagrammatic view 01' the circuit connections of the portion of the circuit of Fig. 8

assignors to Syncro Ma- N. .L, a corporation 1934', Serial No. 741,046

modified to show an arrangement in which only one commutator ring is employed;

Fig. 10 is a further modification employing but a single commutator ring.

The present invention represents an improvement of a portion of the machine shown in the copending application of Fantone and Jameson, Serial No. 702,520, filed December 15, 1933. The structure herein disclosed is concerned particularly with improvements in the serving head of a machine such as that disclosed in the above mentioned copending application. The general electric circuit arrangements as employed with the apparatus of which the structure of this case is an improvement is similar to that disclosed in the above mentioned copending application and is shown in this case'with the modifications which adapt it for use with the improved serving head structure about to be described.

The standard or bracket l which supports the serving head is to be attached to the main standard of the machine in proper position and has secured thereto in any suitable way the serving head motor 2. This motor is provided with a shaft 3 which has a central passage extending entirely therethrough through which the strand or wire W passes longitudinally. Secured to the shaft 3 at the upper end of the motor is the bearing member 4 which is journaled in the casing 5 forming a part of the upper end plate andv the motor, as illustrated. The casing 5 extends into a radial platform or vertically extending wall at its periphery. The rotatable base plate I in the general form of a disc is provided with a central depending hub 8. This base plate is secured to the bearing member 4, which rotating with the shaft 3, causes conjoint rotation of the base plate. The depending hub 8 is provided with an insulating ring 9 on its periphery upon which in turn are mounted the continuous commutator rings l and II. Ring II is engaged by a brush l3 which is slidably mounted in a brush holder tube 12. Mounted upon the plate 6 in suitable supports, as shown, so as to insulate it therefrom within the tube, is a spring l4 bearing upon the brush l3 to urge it into contact with the commutator ring II, and held in place by means of a removable insulating screw cap l5. In a similar way a brush it for the commutator ring 10 is mounted at the opposite side of the machine.

Supported upon the base plate I with an angular displacement of 90 degrees are the four rotatable guides l1 which are commonly used with serving heads of this type. The base platel isprovided with a central cavity l8 opening from the top thereof and preferably of circular cross section. Within this cavity, and mounted upon" shaft 3, is a cylindrical cup shaped iron or steel casing 89. This casing is keyed to the shaft 3 for rotation therewith, but is slidably mounted thereon. Springs l9 are interposed between the bottom of the cavity and the bottom of the casing l9 so as to form a resilient seat therefor. Within the casing I9 is an annular member 20 having a central upstanding circular ridge 2.5 with a rounded top edge, as is clear from Fig. 6. The ring-like member 20 is rotatably journaled in the casing l9 on the ball bearing 21. Fitting snugly within the inner wall of the casing l9 is a ring shaped magnetizable winding 22.

The ring like member 20 is connected to the casing 69 by means of a coil spring 23 having its lower end in a slot in the casing (see Fig. 6) and having its upper end in a slot in the ring-like member 20. Thus the member 20 is locked to the casing l9 and the shaft 3 but is permitted some relative movement with respect thereto through this spring connection.

Mounted between the winding 22 and the member 20 is a bracket 26 having an adjustable stop screw 25 locked thereon. This stop screw is'positioned to engage an arm 23 secured to the member 20 and having a depending lip for engagement with the stop screw. Upon the other side of the ring 23 is secured another arm 28 having a contact secured thereto. This contact is positioned so as to engage a fixed contact 29 mounted in a bracket 3!] and insulated therefrom, which bracket is secured to the casing I9. The spring 23 is so arranged that normally it causes the member 20 to rotate on its bearing so as to engage the contact on the arm 20 with contact 29. Secured diametrically opposite to each other in the casing I 9, are a pair of brackets 3! which have lips overlying the ring member 20 so as to hold it from moving longitudinally on the shaft 3.

As has been clearly shown in Fig.4 there is mounted uponthe shaft 3 towards its upper end, by means of roller bearings 34 and 35, the cop spindle 32. Such spindles are commonly used in serving heads of this type, and are constructed to receive the cord or spool of tape to be wrapped around the string or wire. Secured to the lower end of the cop spindle is an iron or steel disc 33 positioned not only to engage the rounded edge of the ridge 2!, but when in such engagement to be in close proximity to the rim of the cup shaped member IS. The upper end of the cop spindle is engaged by a ball bearing 31 which is applied un-' der the proper pressure to the end thereof by means of a vertically adjustable hand nut 36. Thus the pressure of the cop spindle and casing 19 with all of its parts upon the springs l9 may be properly adjusted to space the web from the cop under proper tension as it is fed therefrom. The upper end of shaft 3 is longitudinally slotted and tapered and is threadedly engaged by an adjustable nut 40 which is internally tapered. By means of this locking arrangement the guide die 38 may be locked in place. This die has a smaller bore through the center thereof for guiding the wire or string therethrough. Secured to g the guide die 39 is the nose piece 4| upon which in turn is mounted the nose guide 42. Both of these parts are likewise commonly used with devices of this type.

The rotatable base plate I is provided with a peripheral rabbet forming a depending flange l of cylindrical cross section which is engaged by the brake bands 43 and M, which are pivotally tically movable rod 49. This rod is provided with a cam member 52 which lies between the end side faces of the extensions and the brake bands. The lower end of rod 69 is pivotally connected to the armature 545. This armature is pivotally supported upon a steel bracket 55 which forms a part of the core for the electro-magnet 58. As will be apparent, when the electro-magnet is energized the armature will be pulled down carrying with it rod 49 and cam 52. The cam will be forced between the projecting ends of the brake bands forcing them apart and releasing the brake. Whenever the electro-magnetis deenergized spring 55 will draw the armature, rod and cam upwardly and permit the springs 48 to apply the brakes to the rotatable base plate 1.

A complete circuit arrangement for the apparatus will now be described in detail. The complete machine as illustrated in the above mentioned application, modified to the extent of employing the serving head of this application is illustrated in Figs. 1 to 7 inclusive. The feature of the circuit diagram about to be described,'

and illustrated in Fig. 8 is that two commutator rings are employedon the serving head as illustrated in Fig. 1 with circuit connections such that the brake coil is energized every time the machine is shut down either by the automatic stop switch, or by a manual stop button. The main power supply is illustrated as a three phase alternating current circuit represented by the supply mains 60. At BI is the main control switch by means of which the entire apparatus may be disconnected from the power source. The wires also extend through a second control switch 62 which is operated to energize and deenergize the take-up motor 63. As illustrated in the above mentioned application, the take-up mtor is employed to operate the take-up reel upon which the finished product is wound. When switches BI and 62 are closed the motor 63 is directly energized for operation at a speed determined by the adjustment of the rheostats I09 connected to the rotor circuit of that motor by the wires I08. Wires 60 are connected by wires 64 to the stator or field winding of the motor 65 which is directly connected to an alternating current. generator and to the capstan wheel, in accordance with the disclosure in the above mentioned application. 66 diagrammatically represents the generator operated by the motor 65.

The rotor of the motor 65 is connected by the wires 61 to the resistances 68, which in turn are connected by the wires 69 and II to one contact of each of the two upper pairs of the relay 10. The corresponding contacts are connected together and by wire 12 to the three resistances 68. These resistances are connected in a potentiometer circuit, and are provided with the variable tap connections 13, 14 and 15, each of which is connected to one of the resistances 18. These wires are respectively connected by the wires 19, 8| and 82 to the contacts of the relay 80, as illustrated. The other ends of resistances 18 'are connected by the wires 83, 85 and 86 to the contacts of relay 84 as illustrated. At 81 and 88 I are electric time clocks which operate the switches 93 and 92, respectively. These time clocks are of any one of a number of well known forms, and are of the type which may be set to operate for a predetermined period of time at the end of which the switches which are a part thereof close.

One terminal of the operating solenoid of relay 18 is connected by wire 16 to one terminal of the solenoid of relay 88, one terminal of the solenoid. of relay 84, one terminal of the time clock 81, one terminal of the time clock 88, and to wire 11, which is connected to one terminal of the brake solenoid 56, and to one terminal of the secondary I82 of the transformer I88.

The other terminal of the solenoid of relay 18 is connected by wire 89 to one contact of the start switch 98 and to wire 9| which interconnects the other terminal of the brake solenoid 56 with one terminal of each of the switches 92 and 93 of the time clocks. Wire 9I is also connected to the other terminal of the time clock 88. The other terminal of the solenoid of relay 88 is connected by wire 94 to the other contact of switch 93, and the other terminal of the solenoid of relay 84 is connected by wire 95 to the other contact of switch 92, and to the other terminal of the time clock 81. One terminal of the normally closed stop switch 98 is connected by wire 99 to one contact of the second highest pair of relay 18. The corresponding contact is connected by wire 59 to wire 89. The remaining contacts of switches 98 and 98 are connected by a common wire 96 to onecontact of the relay 91. The other contact of this relay is connectedto the other terminal of. secondary I82. Another secondary I83 of the transformer I8I has one terminal grounded and is connected at its other terminal by wire I84'to the solenoid of relay 91, which in turn has its other terminal connected by wire I85 to the brush of ring II. The primary of the transformer IN is connected through wire I88 to one phase of the main current supply. The brush of ring I8 is connected by wire I86 to one of the contacts of the lowest pair of relays 18.

The corresponding contact is connected by wire I81 to wire I84. It is noted that relays 18, 88, 84 and 91 are shown in deenergized position.

The stator or field winding III of the generator 66 is connected by the wires .I I8 to the main current source. This winding is of course a three-phase Winding. One of the terminals is connected by Wire II 3 directly to one terminal of the three-phase field winding N4 of the serving head motor 2. The other terminals of the field winding III are connected by the wires] I2 to the reversing switch H5, and through it by wires- H6 to the remaining terminals of the field II4. In a similar manner? the rotor windings of the generator are connected by wire I I1 to one terminal of the three-phase rotor winding of the serving head motor 2, and by wires II 8 through the reversing switch and-wires II9 to the other terminals of the serving head rotor.

The operation of this circuit'will now be described. The reversing switch H5 is at either of its two positions, depending upon the desired direction of rotation of the serving head. The value of this feature is that where two or more i layers of insulation are applied to a wire in a The parts in Fig. 8 are all shown in completely deenergized position, switch 6I being open. The stop switch 28 is of course normally open when there is tension on the tapeor web which is to be wound around the wire, as will be apparent from the above description of the automatic stop switch.

When the switch BI is closed the fields of the motor 65 and the generator 66 are energized and the primary of transformer I8I is energized. To start the machine up switch 62 is closed, thereby energizing the take-up motor 63. Start switch 98 is'closed, with the result that current flows from secondary I82 through relay 91, wire 96, switch 98, wire 89, the solenoid of relay 18, wire 16, the operating winding of time clock 88, and by wire 11 back to the other terminal of the secondary I82. Current also flows from wire 16 to the brake solenoid 56 by way of wire 9I and wire 11 to the secondary I82. The time clock 88 has been set to close the switch 92 at the end of a predetermined period of time for a purpose to be described. The switches controlled by the relay 18 will be closed and the brake dle brake coil 22 will be broken at the lowest 6 pair of contacts of relay 18. Thus only a momentar y closure of switch 98 is necessary.

Until switch 92 closes the resistance in the rotor circuit of motor 65 is-the resistance 68 which is the maximum amount. Motor 65 will then begin to operate and will pick up to a speed corresponding to that amount of resistance in its rotor circuit when time switch 92 is closed by the time clock' 88 at the end of the period for which it is set the circuit to the solenoid of relay 84 is closed and the operating winding of time switch 81 is energized, starting it. Energization of relay 84 closes its switches putting a short circuit on the right hand end of resistors T8. The resistance in the rotor circuit of motor 65 is that of resistors 18 plus the resistance of the portions of resistors 88 to the right of adjustable taps 13, 14 and 15. The resistance of resistors 18 is less than that of resistors 68. The motor therefor continues to pick up speed until the end. of a predetermined period, when the time clock 81 closes the switch 93. Relay 88 is thus energized, having a short circuit across the left hand ends of resistances 18. The result is that the resistance in the rotor circuit is that of the portions of resistors 68 to the right of taps 13, 14 and 15 which is a less amount than that represented by the previous set of connections. The motor thus comes up to final and operating operate, its winding being energized from the generator in an obvious manner. The apparatus then continues to operate until the stop switch 98 is opened. When this occurs the holding circuit for the relay 18 through wire 99 is broken, thus opening the rotor circuit of the motor 65.

At the same time a circuit for the cop spindle brake coil 22 is made from the secondary I83 through wire I81, the lowest pair of contacts of relay 18, wire I86, commutator ring I18, and

thence through the brake winding 22 to ground. This immediately brings the cop spindle to a stop-, preventing it from overrunning, and thus preventing an undesirable unwinding of the tape on the cop spindle. At the same time that the holding circuit for the.relay I is broken the circuit for the brake solenoid B is broken, so that the brake bands 43 and M (Fig. 2) may bring the serving head to a quick stop.

These same operations will occur automatically if the web T breaks. When this web breaks switch 28 will close in accordance with the structure thereof as described in connection with Figs. 5, 6 and 7, so that a circuit to the operating solenoid of relay 9! is made through wire I95, wire IM and the secondary I03. When this happens the relay opens again, breaking the holding circuit for relay l9, and breaking the circuit for the brake-solenoid 56. Thus the arrangement just described efiects automatic stopping of the apparatus and prevents overrunning of the cop spindle Whether the machine is brought to a stop in the normal way by opening the stop switch 98-, or whether it is brought to a stop in an emergency operation when the tape breaks or the .tension thereof is reduced at any time sufiiciently to permit the switch 29 to close.

A modificsation of this circuit in part is illustrated in'Fig. 9 to show the connections necessary when only one commutator ring is employed on the serving head. With this arrangement the brake coil for the cop spindle will only'be energized when the machine is stopped by the automatic switch, and will not be energized when the stop switch is opened. Only that portion of the main circuit of Fig. 8 is herein illustrated to bring out the change in connections involved,

, part of the entire system.

although of course the circuit of Fig. 9 is only a In some cases the vsame reference numerals have been used to ply is shown at I50 as before, and the main switch I is shown at 6|. The wires 60 each go' to one contact of the three upper pairs of the relay ill. The corresponding contacts are connected by the wires I32 tothe field of the motor 65. The rotor circuit in this case is illustrated with adjustable resistances 68 therein, it being apparent, .however, that the potentiometer arrangement of interconnected relays and time clock switches may be employed to effect automatic starting of this motor. The arrangement'of Fig. 9 is a manual equivalent thereof in which the amount of resistance is gradually cut into the rotor circuit manually. The primary of the transformer I36 is energized from one phase of the main circuit by the wires I35. One terminal of the solenoid of relay I0 is connected by wire I34 to one of the wires 60 and the other terminal is connected by wire I33 to wire I31, which interconnects one contact of the start switch 98 with one of the contacts of the lowest pair of the relay 19.

One contact of the stop switch 98 is connected by wire I38 to one of the contacts of the normally closed relay-91. The other contact is connected by wire I39 tothe other contact of the lowest pair of relays IS. The other two contacts of the switches 98 and 98 are connected by acommon wire to, one of the wires I35. One terminal of the solenoid of relay 9'! is connected to ground through the secondary of transformer I36 and the other terminal is connected by wire M9 to the brush of the commutator ring I0. With this arrangement. when switch BI is closed the primary of transformer I36 is energized. To energize relay 70 start switch 90 is closed, current flows from the current source through switch 90, wire I37, wire I33, the solenoid of relay Hi and wire I3 3 'back to the current source. A holding circuit for the relay is then made through stop switch 98, the switch of relay 9?, wire I39, the lowest pair of contacts of relay I0 and wires I31 and I33.

To stop the machine in normal operation it is only necessary to open switch 98, thereby opening the holding circuit and deenergizing relay 'Il]. However, the cop spindle brake coil 22 is not energized. If when the machine is running the tape or web being fed from the cop breaks, switch 28 closes completing a circuit that is quite apparent through wire MB to energize relay 9? so that it breaks the holding circuit for relay I0. At the same time the brake coil 22 is energized, thereby bringing the cop spindle to .a quick stop.

In the modification of Fig. but one commutator ring is again used in which arrangement the cop spindle brake coil 22 will be energized when the machine is stopped by the stop button 98, or by the closing of the automatic stop switch 28. In this arrangement the main circuit wires 60 are again connected through a control switch GI to the field of the motor 65. The primary of the transformer I36 is connected by wires I35 to the current source. The resistances 6B are connected in the rotor circuit of the motor. Here again, as before the automatic potentiometer starting circuit illustrated in Fig. 8 may be employed' In this case the relay HI has its operating winding connected at one terminal by wire I45 to one of the wires I35. The other terminal of this winding is connected by wire I46 to one of the contacts of the start switch 99 and is likewise connected to one contact of the third lowest pair of the relay. One contact of the stop switch 98 is connected by wire I48 through the relay switch 91 and wire I49 to the other contact of the third lowest pair of relay ID. The other contacts of the switches 90 and 98 are connected to a common wire I41 to the other wire I35. One terminal of the grounded secondary of transformer I36 is connected to one terminal of the solenoid of relay 9? and to one contact of the lowest pair of relay Ti). The other contact of this pair is connected to wire I50 which connects the other terminal of the solenoid of relay 91 with the brush of ring I 0. One terminal of the upper and lower resistances B8 is connected by the wires Ital to one contact of each of the two upper pairs of relay 19. The corresponding contacts of these" pairs are connected by a common wire I52 to the remaining resistance 58.

In this arrangement the relative strength of the windings 22 and 97 is such that when switch 28 is opened the current flowing is not enough I to operate the relay or enough to; cause the brake coil 22 to exert any serious braking action on the cop spindle. When switch BI is closed the primary of transformer I36 is energized and the stator or field winding of motor is energized.

To start .the apparatus switch 93 is closedwhich completes a circuit which may readily be followed to the solenoid of relay 79, energizing it and operating the relay. The operation of the relay escircuit. At the same time a more direct circuit from the secondary of transformer I36 through the lowest pair of contacts of relay 10 is made to the brake coil 22 causing it to prevent thecop spindle from overrunning and directly short circuiting the winding of relay 91. When the apparatus is automatically'stopped by the breaking of the tape, switch 28 closes, completing the circuit tothe solenoid of relay 9] through wire I50 and hence breaking the holding circuit for relay 10 at relay 91. Here again the return of relay 10 to the deenergized position shown short circuits relay 9'! and directly connects the cop spindle brake coil 22 to the secondary of transformer I36.

From the above description it will be apparent that this invention resides in certain principles of construction which may be embodied in other physical forms without departure from the scope thereof. We do not, therefore desire to be strictly limited to the disclosure as given for purposes of illustration, but rather to the scope of the appended claims.

What we seek to secure by United States Letters Patent is:

l. A serving head as described comprising a -motor, a rotatable support driven by said motor,

a cop spindle rotatably journaled on said support, a magnetic brake acting upon the cop spindle to prevent rotation thereof on the support when energized, an energizing circuit for said brake including a control switch, means for biasing said switch to closed position, and means acting to oppose said biasing means to prevent closing of said switch when a web is being fed from a cop on the cop spindle.

2. A serving head structure of the type described comprising a motor, a rotatable member driven by said motor, a cop spindle journaled on said member for supporting a strand spool, and magnetic braking means secured to said member and rotated by it including a switchfor controlling a circuit to energize said means when the strand breaks to prevent rotation of the cop spindle on said member.

3. A combination comprising a serving head including a cop spindle rotatably mounted thereon, an electric motor for driving the serving head, a magnetic brake positioned to act on the cop spindle, a switch having an operating member engaging thecop spindle and normally held open when a web is being fed from the cop spindle, a circuit for said motor and magnetic brake including a control device controlled by said switch whereby said motor is deenergized and the magnetic brake is energized when the web breaks.

4. An apparatus as described comprising a serving head having a cop spindle rotatably mounted thereon, said cop spindle being adapted to support a'strand spool, means for rotating the serving head, a magnet winding positioned to bring the cop spindleto a stop when energized and a switch engaging the cop spindle and held open by rotation thereof for completing a circuit to the winding when a strand fed from the spool breaks.

5.-An apparatus as described comprising a serving head having a cop spindle rotatably mounted thereon, said cop spindle being adapted to support a strand spool, means for rotating the serving head, a magnet winding positioned to bring the cop spindle to a stop when energized,

held open when a strand is being fed from the strand spool.

6. In a structure as described the combination magnet winding mounted adjacent the cop spindle for bringing the cop spindle to a stop when energized, a circuit for said winding, and a normally closed switch in said circuit and positioned to engage the cop spindle so as to be held open by the feeding of a strand from the cop spindle.

8. In a structure as described the combination comprising a rotatable plate, a magnetizable cop spindle rotatably journaled on the plate, a fixed magnet winding mounted adjacent the cop spindle for bringing the cop spindle to a stop when energized, a spring closed switch positioned to engage the cop spindle and normally held open against the closing action of the spring by the feeding of a strand from the cop spindle, and a circuit including said winding and switch whereby the winding is energized when the strand breaks.

9. In a serving head of the typefor wrapping a web around a core and including a rotatable shaft having a cop spindle freely journaled thereon for supporting a web spool, the combination comprising a magnetizable core positioned adjacent the cop spindle, a magnetizing winding therefor, a switch positioned engaged by the cop spindle and normally held open by the feed of a web from the spool on the spindle, and circuits including said switch and winding whereby the winding is energized when the web breaks.

10. A stopping mechanism for a serving head comprising in combination a motor driven serving head having a cop spindle rotatably mounted thereon, an energizing circuit for said motor, a switch in said circuit engaged by the cop spindle and normally held open when a webis being fed therefrom, and means for closing the switch when the web breaks. 1

11. A stopping mechanism for a serving head comprising in combination. a motor driven serving head having a cop spindle rotatably mounted thereon, a switch engaged by the cop spindle and normally held open when a web is being fed therefrom, means for closing the switch, a magnetic brake operating on the cop spindle and circuits for said motor and brake controlled by said switch for causing deenergization of the motor and energization of thebrake when the switch closes.

12. In a machine for applying a web in the form of a spiral wrap around "a longitudinally moving strand, the combination comprising a motor driven serving head, a motor generaton'connected to the serving head to operate it, energizing circuits for the serving head motor and the motor generator including starting resistances for the motor and the motor generator, andautomatically operating time switches for gradually cutting resistances in to the rotor circuit of said motor.

13. In a machine of the type flescribed the combination comprising a serving head, an electric motor for operating the serving head, a generator connected thereto for supplying current to the serving head motor, a second motor for operating the generator, energizing circuits for said second motor including control devices, and

means for automatically cutting resistances in to the circuits of the second motor to bring it up to speed after initial energization.

14. In a machine for wrapping a web around a core, the combination comprising a serving head, an electric motor for operating the serving head, a generator connected to said motor for energizing it, a second motor for operating the generator, energizing circuits for the second motor and said generator, including control devices, and

means connected to' the control devices for operating them to break the energizing circuits when the web breaks.

15. In a machine for wrapping a web around a core, the combination comprising a serving head, an electric motor for operating the serving head, a generator connected to said motor for energizing it, a second motor for operating the generator, energizing circuits for the second motor and said generator including control devices, means connected to the control devices for operating them to break the energizing circuits when the web breaks, and a magnetic brake controlled by, said control devices for bringing the serving head to a stop When the web breaks.

16. In a machine for wrapping a webaround a core, a serving head having a freely rotatable web spool spindle mounted thereon, an electric motor for operating the serving head, a generator connected to said motor for energizing it, a second motor for operating the generator, energizing circuits for said second motor and generator including control devices, and means connected to the control devices for operating them to deenergize said second motor and said generator when the web breaks.

1?. In a machine for wrapping a web around a core, a serving head having a freely rotatable web spool spindle mounted thereon, an electric motor for operating the serving head, a generator connected to said motor for energizing it, a second motor for operating the generator, energizing circuits for said second motor and generator including control devices, means connected to the control devices for operating them to deenergize said second motor and said generator when the web breaks, and magnetic braking means energized when the web breaks for preventing rotation of the spool spindle on the serving head. L

18. A structure as described comprising a rotatable plate, a cop spindle rotatably mounted on said plate, a magnetizable member secured to said cop spindle, a magnetic brake positioned to magnetize said member, and means controlled by the cop spindle for energizing said brake when the web being fed from the cop spindle breaks.

19. In a serving head having a power driven shaft, a cop spindle freely journaled thereon and a magnetizable member carried by the spindle,v

Images