US2003353A

US2003353A - Automatic stop device

Info

Publication number: US2003353A
Application number: US702520A
Authority: US
Inventors: Charles B Fantone; Reuben M Jameson
Original assignee: Syncro Machine Co
Current assignee: Syncro Machine Co
Priority date: 1933-12-15
Filing date: 1933-12-15
Publication date: 1935-06-04
Anticipated expiration: 1952-06-04

Description

June 4, 1935.

. C. B. FANTONE ET AL AUTOMATI 0 STOP DEVICE Filed Dec. 15, 1935 4 Sheets-Sheet l c "jVENTORj- 0 145915 '2 5 2 5 ATTORNEYS June 4, 1935. c, B, FANTONE Em 2,003,353

AUTOMATIC STOP DEVICE Filed Dec. 15, 1955 4 SheetsSheet 2 lNVENTOR/ Char/c5 B Foul-one BY Rtubcn MJ'anw-Mn June 4-, 1935. Q B FANTONE ET AL 2,003,353

AUTOMATIC STOP DEVICE Filed Dec. 15, 1953 4 Sheets-Sheet 3 ew m5 m S V... MMFJ E N 5 m m mm c June 4, 1935. c. B. FANTONE ET AL 2,003,353

AUTOMATIC STOP DEVICE Filed Dec. 15, 1933 4 Sheets-Sheet inxuxot 058R n: 3 it g &\ 8T 3 QQN. M3

32:3 EQEt Patented June 4, 1935 UNITED STATES AUTOMATIC STOP DEVICE Charles B. Fantone, Lyndhurst, and Reuben M. Jameson, Teaneck, N. J., assignors to Syncro Machine Company, Newark, N. J., a corporation of New Jersey Application December 15, 1933, Serial No. 702,520

6 Claims.

This invention relates to improvements in automatic stopping devices for machines which apply to a longitudinally moving core, a web or strand of material in the form of a helical wrap comprising adjacent or overlapping turns.

An important object of the invention is to provide a machine in which the web or strand controls its operation ina manner so that in the event of breakage of the web or strand the entire machine will come to a stop.

The invention is broadly applicable to any machine for wrapping a web around a ,core. More particularly, it has been'adapted for use on a machine of the type disclosed in our copending application, Serial No. 634,350, filed September 22, 1933.

There are many objects of this invention which will be more readily appreciated by a detailed reference to the attached drawings.

This invention resides substantially in the combination, construction, arrangement and relative location of parts all as will be set forth in full detail in the following specifications taken in-connection with the attached drawings.

In the drawings:

Fig. 1 is a side elevational view of the mechanism of this invention showing some parts in cross sectional View.

Fig. 2 is a top plan view thereof.

Fig. 3 is a cross sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is a cross sectional view taken on the line 4-4 of Fig. 2.

Fig. 5 is an enlarged detail view showing the control or stopping switch in open position as distinguished from its closed position illustrated in Fig. 4.

Figs. 6 and 7 disclose a modified form of switc shown in closed and open position respectively.

Figs. 8 and 9 are plan and side views respectively of a further modified form of switch showing the switch in closed position.

Fig. 10 is a side view of switch in open position.

Figs. 11 and 12 are side and plan views, respectively, partly in cross section, of another modified form of switch shown in closed position.-

Flg. 13 shows this switch in open position.

Figs. 14 and 15 are side views of a still further modification of the switch in closed and open positions, respectively.

Fig. 16 is a circuit diagram of the invention herein disclosed.

In machines for wrapping a web around a I longitudinally advancing core, such as a wire insulating machine, it is of considerable importance that the machine stop as quickly as pos sible upon the breakage of the web. The core or wire is advanced at a rapid rate and when the web breaks, it is apparent that a considerable 5 length of wire may pass through the machine before it is brought to a stop. This means that the machine must either be run in the reverse directionso that the web can be applied from the point of breakage, or else the core must be cut 10 out between the brake and the new point of application of the web, resulting in large wastage losses. Furthermore, in any event, the breakage of the web means stoppage of the machine, taking it out of productive use for considerable periods of time. Breakage often occurs in the web in machines of this type either both because of the nature of the web being applied or because the high rate of travel of the core or wire through the machine. 20

It is a purpose of this invention to provide a mechanism in which, immediately upon breakage of the web, the machine comes to an almost instantaneous stop. The control device of this invention for effecting stoppage of the machine consists of a switch controlled directly by the web itself. Thus, when the web breaks, the switch is operated to stop the machine.

Referring now to the drawings from which the details of the invention will be best understood, there is shown in Fig. 1 a portion of the supporting framework of the machine at l. Extending horizontally from the machine frame is a bracket 2 which supports an electric motor 3 which drives the serving head. Supported on the upper end of the motor casing is a flanged plate l which is secured to the motor casing by the bolts 6. Extending upwardly so as to revolve on a vertical axis is the shaft I of the motor connected to the armature 5 thereof. Secured to this shaft is a suitably shaped collar 9 which is rot: tably supported in the ball bearing structure 8.

Encircling the motor shaft, and secured to the collar 9 is the base plate [0 of the serving head which is secured to the collar by means of machine screws, as shown. Journalled for rotation upon the vertically extending end of the shaft 1 is a sleeve II which supports the spool or bobbin I5 of wrapping web or strand. Where wire is being wrapped, this web may be of some suitable insulating material.

Secured to the upper end of shaft 1 for rotation therewith is the nose piece l2. At I4 is the usual casing surrounding these parts.

Supported on the base plate It in balanced relation are a plurality of spindles l3 which rotatably support the guide sleeves I8. The spindles l3 are secured in the base plate .by means of the nuts IT. The spindles l3 have longitudinal bores therethrough as clearly shown in Fig. 4. It might be noted that the motor shaft likewise has a longitudinal bore therethrough through which the core to be wrapped advances longitudinally.

The upper end of spindle I3 is counterbored to receive a screw 20 which looks a collar I9 to the spindle. The screw 20 has a bore therethrough in which rests an insulating bushing 21 likewise centrally bored. Mounted in the bore of the bushing 2| is a contact 23 which is connected to a wire 30 extending through the spindle and the lower insulating bushing 22. Supported from the collar I9 is an arm 24. on which is pivotally supported at 25 a lever 26. Slidably mounted in one end of this lever is a contact 21 a which cooperates with the contact 23 and which is resiliently urged into engagement with contact 23 by means of the fiat spring 28. Secured to the other end of lever 26 is an arm 29. This arm 29 as will be noted from Fig. 4 extends at an angle to the longitudinal axis of lever 26. This angle should be at least approximately five degrees. In other words, the arm 29 projects generally along an axis below the horizontal axis of the lever26 in its normal position. The free end of arm 29 is suitably shaped and positioned to be in the path of web |6 as it passes around the guide sleeve I8 and into the nose piece l2. Thus, the web engaging arm 29 from below holds contact 21 in engagement with contact 23. As will be described later, the machine is grounded and hence a circuit through the machine frame to the insulated contact 23 is completed when the machine is running properly and the web is unbroken.

The resilient connection between contact 21 and lever 26 does not interfere with this circuit even though there be a variation in the tension in web 5 and, hence, a variation in the pressure it exerts on arm 26. By this arrangement, the maintenance of this circuit is insured, for any variations in the tension on web I6.

Immediately upon the breakage of web l6, lever 26 and arm 2! move to the position shown in Fig. 5

disengaging contacts

21 and 23. This breaks the circuits for the operating motors as will be described later, causing the stoppage of the machine. A very important feature of this structure is the position of arm 29 with respect to the axis of lever 26 in its circuit closing position. Since the serving head of a machine of this type may operate at speeds of from four thousand to five thousand revolutions per minute, it is apparent that the centrifugal forces involved are important. If the arm 23 is coincident with the axis of lever 26 or extends thereabove, the switch will not open upon the breakage of the web.

However, with the structure as shown, if the web breaks, the centrifugal force acting upon arm 29 will aid the force of gravity in causing the arm to move downwardly into the position shown in Fig. 5. The parts are so proposed that when the machine is at a standstill, lever 26 will take the position shown in Fig. 5 if not held in place by the web. This tendency is enhanced and insures positive action when the serving head is rotating at high speeds through the action of centrifugal force in throwing arm 29 downwardly.

Wire- 30 extends to a commutator ring 3| mounted upon a ring 32 of insulating material secured to the hub of the base plate In. Engaging this ring (see Fig. 3) is a longitudinally slidable brush mounted in a supporting sleeve or brush holder 34. The sleeve 34 is mounted in insulating supports 33-33 on the'flanged plate 4. A spring 38 mounted in the sleeve 34 edges the brush 35 into contact with the commutator ring 3|. At 36 is an insulating cap for holding the spring in place and allowing for adjustment of its pressure on the brush. The wire 31 is connected to the brush holder and forms part of the circuit controlled by the switch as will appear later.

The tendency of the machine to overrun even upon interruption of the driving motor circuits is eliminated by means of a brake band 39 which engages by its brake lining 40 the base plate l0. As shown in Fig. 1, there is supported on the bracket 2 a solenoid winding 4| which is energized in cable 42. This solenoid has a magnetizable core 44 which controls an armature 45 pivotally supported at 46. Pivotally connected to the armature 45 at 48 is a vertically extending rod 41 which has mounted thereon a cam piece 53. This rod extends through a bracket 40 and is surrounded 'by a spring 50 which normally holds the parts in raised position as shown in Fig. 1. The cam piece 53 moves between the extending arms 5| of the brake band 39. A pin 52 extends through these arms and supports a pair of springs as shown in Fig. 2 which tend to draw the arms 5| together and hence tighten the brake band. When solenoid 4| is energized, however, the cam piece is pulled downwardly separating the arms 5| and releasing the brake.

The modified forms of stop switch structure will now be described. In the arrangement of Figs. 6 and 7 the pivot point 25 for the lever 26 is pivoted to one end. A spring 54 is employed to tend to cause the switch to open. Inthis case, the web |6 passes over the top of arm 29 so that it will hold the switch closed against the action of spring 59 in normal operation. In this case, the axis of arm 29 lies above the longitudinal axis of lever 26. Here again the requirement that this arm extend at an angle of at least approximately five degrees with the axis of lever 26 holds. In this case, however, the angle is above the horizontal as distinguished from being below the horizontal in the form of switch shown in Fig. 4. Although the position of this structure is immaterial in the operation of the device, it might be noted that the preferred position would be at right angles to that shown in Figs. 6 and '7 in the plane of the paper in a manner similar to the arrangement shown in Fig. 4. This observation likewise applies to the other modifications to be described.

Figs. 8, 9 and 10 illustrate a modification particularly adapted for use with a web which is in the form of a thread or cord. In this case, the arm 25 is pivotally mounted intermediate its ends in a manner similar tothe structure of Fig. 4. However, the arm 29', instead of extending from the end of lever 26* is pivotally mounted on the arm 24 below the pivot point 25 The lower end of lever 26 is grooved so that arm 29 may rest therein. In this case, the cord |6 passes up through the aperture in tire enlarged end 29" of lever 29. Fig. 10 shows the position of the parts in the event f the breakage of the cord.

The modification of Figs 11, 12 and 13 differs from the structures previously described in that the axis of the pivot 25 is vertical instead of horizontal. In this case, the lever 26 swings in a hori- 19. This transformer is for zontal plane and the contact 23 in this form of structure is mounted in this case upon an L-shaped bracket 55 which is supported in the insulating bushing 2| and which is connected to wire 39. In this case, the web holds the switch closed and upon breakage the action of centrifugal force will cause the switch to open. The lever 26 operating in a horizontal plane will be thrown open by centrifugal force even though the axis of the arm 29 coincides with the axis of lever 26. In other words, the two axes do not need to lie at an angle.

The final modification is illustrated in Figs. 14 and 15. In this case, the contact 23 is mounted upon a bracket 55 so as to be supported above the contact 21 In this case, the web I9 bears on the under surface of arm 29 and normally holds it in the position shown in Fig. 14. With this form of device, the axis of arm 29 again extends at an angle and to one side of the axis of lever 29 In all these forms of switches, it will be noted that

contacts

23, 29 and 23 are insulated from the machine frame while

contacts

21 and 22 are connected directly to the machine frame which, as stated, is grounded. Likewise, the contacts 21 and 21' are slidably mounted in their support so that the support may be free to move under varying conditions of operation produced by variations in the tension of the web without interfering with the circuit which includes these contacts. Likewise, this free movement 'of the support insures that the web will not be brokenby reason of its engagement with the

arms

29, 29, 29, 29 and 29 The complete power circuit for a machine of thisdsype is illustrated in Fig. 16. The entire machine and its parts is fully set forth in our above noted copending application. The machine com prises a capstan motor 15, a generator 61 directly connected thereto, one or more serving head motors 9, and a take-up reel motor I41. This motor is preferably a torque motor as illustrated in our copending application, Serial No. 694,944, filed Oct. 24, 1933. The main power supply circuit may be a three-phase alternating current circuit of suitable voltage. The supply wires are indicated at 89, BI and 92. At 83 is the main switch which disconnects the major portion of the apparatus entirely from the current source. The leads 94, 65 and 88 from this switch are connected directly to the field of generator 61. These wires are likewise connected by wires 88, I59 and 19 to the fixed contacts of the main contactor 1|. The field of motor 15 is connected by

wires

12, 13 and 14 with the movable contacts of the main contactor 1|. The wires 68 and 89 also connect one phase of the power source with the primary of the transformer the purpose of supplying a lower voltage current for the control circuits. One terminal of the secondary of this transformer is connected by wire 11 to one terminal each of the operating solenoids 18" and 19 of the main contactor 1| and the auxilia contactor. The other terminals of these solenoids are connected by wire 89 to a normally closed switch 8|. The other contact of this switch is connected by wire 92 to a terminal board.

Wire 11 is also connected by wire 83 to one terminal of the field 84 of a' motor 95, the utility of which will later be described. The other terminal of the field 84 is connected by a wire 89 to one of the movable contacts of the auxiliary contactor. This wire 86 is also contacted by wire 88 to the normally open switch 81. The other terminal of this switch is connected by wire 89 to wire 95 which returns to the other terminal of the secondary of transformer 16 and also connects to the fixed conproper point and grounded by tact which cooperates with the movable contact connected to wire 86. At 99 and 9| are a pair of shading coils for the motor 85. These coils are connected together at one of the terminals of each. The coil 99 is connected by wire 92 to one contact of the single pole double-throw switch I94. Wire 96 connects wire 92 to wire 91 through normally closed contacts. The switch arm of switch I94 is connected by wire 98 to the other fixed contact of the auxiliary contactor. Its movable contact is connected by wire 91 to a point between the coils 99-and 9|. The other terminal of the coil 9| is connected by wire 99 to the other fixed contact of switch I94.

and 95 are rheostats, or adjustable resistances, which have one terminal of each connected together and to an adjustable contact arm. The other contact of each of these rheostats is connected by wires I9I, I92 and I93, respectively,

which lead to the armature of the motor 15.

As indicated by the dotted line I99, the motor 85' operates the

rheostats

93, 94 and 95. It likewise operates the switch I94 and the switches 8| and 81. Thus, in the normal position before starting, the

rheostats

93, 94 and 95 are in a position so that their entire resistance is in the armature circuit. At that time, switch 8| is closed and switch 81 is open. Switch I94 is in the position shown.

At I94 is a four-pole double-throw reversing switch. The purpose of this switch is to reverse the current flow to the serving head motor to cause its operation either in forward or reverse. Wires I95 and I95 extend to the revers'ng switch, as shown. Current flows from this circuit through wires I91 and I91 to the field of motor 3. Wire I99 extends directly from the generator to the field. A similar circuit extends from the generator through wires I98 to I99, to the reversing switch I94. Current flows from the switch through wires H2 and M2 to the armature of the serving head motor 3. The third wire of this circuit extends directly from the generator as indicated at H9. The contacts of the reversing switch are cross connected in the usual manner so that by properly positioning the switch the field and armature of the motor 3 may be energized to operate the motor in either direction.

The brake solenoid 4| is connected by wire 42 to one phase of the circuit on the output side of the main contactor, so that the closing of the main contactor energizes the brake coil to release the brake on the serving head.' As soon as the main contactor opens coil 4| is de-energized and the brake applied.

The circuit for the stop switch will now be described. Current for this circuit is secured from the secondary of transformer 19. This circuit s preferably operated by a current of a voltage of approximately 24 volts. For this purpose, the secondary of the transformer is attached at the the wire H3. The other terminal for the circuit extends from wire 85 through wire M4 to a point between the signal lamps H and H5. The other terminal of lamp H5 is connected through wire IIS and the relay wire In to wire 39 which terminates at the insulated contact 23 of the control switch. The frame of the machine is indicated'as grounded-by the wire |I8. Wire 89 is connected through the normally opened switch 299 and a wire I2I to a fixed contact control by the contact disc I29. The other fixed contact controlled by this disc is con-- nected by wire I I9 to the terminal board. A second contact disc I22 controls a pair of contacts wire I2! to wire II9 through the terminal board.

Wire is connected through the terminal board to wire I30 which extends to one fixed contact of the normally closed stop switch I29. The other contact is connected by wire I28 to one of the contacts of the start switch, as shown.

The take-up torque motor I4! is energized from the current source through wires I40, I 4|, and I42, switch I43, and wires I44, I45 and I46. The armature of this motor has connected therein through the circuit wires I48 the adjustable resistance combination I49. This combination includes three adjustable resistances which are manually operated by means of a single control handle as diagrammatically illustrated by the dotted line I50.

The necessary lamps and trouble lights, well as the electric drier, are energized from a suitable current source connected to wires I5I. The switch at I52 controls this circuit... The lamp I53 represents a trouble lamp and the lamp I54 represents a lamp which maybe mounted adjacent the serving head. The electric heater I55 is energized from this circuit; This heater is likewise disclosed in'ou'r copending application first mentioned above. Its purpose is to-dry the insulating adhesive which is applied either'under and/or over the web after it is appliedto the core. In the circuit thereto is a thermostatic switch for turning the heater on or ofi within desired temperature limits. The-heater comprises a plurality of resistances such as, for example, three resistances, controlled by a wellknown form of switch indicated diagrammatically at I5I. This is a four-position switchin one position, one unit of the heater is in circuit; in the second position, two units are in circuit; in the third position, three units are in circuit and in the fourth and final position, all units are out of circuit.

The operation of these circuits will now be described. To set the apparatus in operation, the main switch 63 is closed. As a result, current is fed to the fixed contacts of the main contactor II and to the field of generator 61; Likewise, the primary of transformer I6 is energized. At the same time, switch I04 is normally closed to a position so that the serving head motor 3 will be prepared for energization for forward or normal drive.

As disclosed in our first mentioned copending application, by this arrangement, any movement of the serving head which is directly connected to motor I5 and the directly connected generator 61, will cause an equivalent and simultaneous movement of the serving head. This means, then, that any movement of the core will insure the application of the web thereto. At this time, with the machine at a standstill, all of the resistance of

rheostats

93, 94 and is in circuit with the armature of motor I5. Likewise switch 8| is closed and switch I64 isin the position snown. Switch 81 is open-1nain contactor II is bpen-the auxiliary contactor I9 is open-and the Winding of relay III is deenergized. With winding Ill deenergized, contact'disc I20 isout of engagement with its contacts and contact disc I22 is in engagement with its contacts.

As will now be apparent, the stop switch is controlled by the web at a point between the web supply cop and the point of application of the web. Thus, when the web breaks, all circuits are opened and the serving head brake appjied to bring the machine to an almost instantaneous stop. This reduces waste and eliminates the necessity of rewinding the core back to the break, as distinguished from prior art practice in which a considerable amount of core passes through the machine after the web breaks before the machine stops.

To start the machine, start switch I26 is closed. Current then flows from one terminal of the secondary of transformer I6, through wire 11, relay winding I8, wire 80, normally closed switch BI, wire 82, wire I25, switch I28, wire I28, normally closed stop switch I29, wire I30, and wire 85, back to the other terminal of the secondary transformer. 16. The energization of relay winding I8 causes the closing of the contacts operated thereby. The result is that current fiows through wires 12, I3, and I4, to the field of motor I5 setting it in operation. This causes the operation of generator 6! and through its operation the operation of the serving head motor 3.

It should be notedthat it is preferable that switch I43 be closed before the start switch I25 is clos'ed. This energizes the take-up motor I47, causing the wire, as it comes from the capstan to the take-up reel, to be under a tension, depend- ;ing upon the ,energization-of the take-up motor.

This motorbeinga torque motor, itwill exert a constant pull on thewire, which pull may be manually adjusted by adjusting the resistance in the armaturewindings of the motor through the manual rheostat combination I49.

The energization of relay 18 also closes switch 200. The return circuit for the winding I8 is then through switch 200, wire I2I, contact disc I20, wire H9, wire I21, wire I28, normally closed stop switch I29, wire I30, and wire 85 to the other terminal of the secondary of transformer I6. This provides a holding circuit for the relay winding I8 keeping the main contactor closed.

At the time of energization of relay winding I8 the relay winding I9 of the auxiliary contactor is energized. As a result, the circuits controlled thereby are closed. It should be noted that the holding circuit for the relay winding I8 just described also forms a holding circuit for the winding I9. The closing of the auxiliary contactor completes a circuit for the field 84 of motor 85 as follows: Current flows through wire 83, field winding 84, wire 86, left-hand contacts of the auxiliary contactor, wire 85 to the terminal of the secondary of the transformer I6. At the same time, the shading coil 9| is energized as follows: from the right-hand end thereof through wire 99, switch I04, wire 98, the righthand contacts of the auxiliary contactor, and wire 91, back to the other terminal of this shading coil. As a result, motor 85 is set into operation. This motor causes the resistances of

rheostats

93, 94 and 95 to be gradually cut out of the armature circuit of motor I5 as it comes up to speed. Likewise, as this motor starts to operate, normally closed switch 8| opens and normally opened switch 8! closes. As the resistances in the. motor armature circuit are completely cut out, the switch I 04 is swung from the position shown to engage left-hand contact to set the motor for operation in the opposite reverse operation since the shading coil 50 direction. This stops motor 85' by breaking the circuit for the shading coil 9|. This motor and the parts controlled thereby are then set for reverse operation when the machine is brought to a stop, at which time the resistances of the

rheostats

93, 94 and 95 are cut back into the motor armature circuit.

Switch I04 is then set for reverse operation completing the circuit for the shading coil 90 through the auxiliary contactor 19. As will be apparent, the circuit for the shading coil 92 will also be completed through the normally closed contact of the auxiliary contactor so that the motor 85 upon energization will be prepared to cut all of the resistance back in the armature circuit of the motor 15 either while the machine is running or when it is deenergized.

Switch I04 is an adjustable limit switch and may be manually set so as to control the amount of resistance cut out and, hence, determine the speed of operation of the machine. In one extreme position of adjustment of switch I little or no resistance is cut out so that the machine runs at slow speed. At the other limiting position of adjustment of this switch all of the resistance is out out and the machine runs at maximum speed. By adjusting the limit switch I04 between these extremes, any desired speed of operation of the machine is secured. As pointed out above, the motor 85' which operates the rheostats likewise operates the switch IM' and at the end of its movement in either direction sets this switch for the necessary operation in the reverse direction. The speed of the machine may be controlled while running by energizing the motor 85' for is in closed circuit through the auxiliary contactor I8 when it is either energized or tie-energized. Thus, if switch IN is at its left-hand position the shading coil circuit is complete.

Gil

, in the drawings.

A circuit for the automatic stop switch is completed as follows: from one terminal of the secondary of transformer 18 through wire 85, wire Ill, signal lamp II5, wire H6, relay winding II1, wire 30, contact 23, contact 21, frame of the ma chine to ground at H8, and thence back through ground H3 to the secondary of the transformer. It will be apparent that this circuit is complete the moment main switch 63 is closed which results in the energization of the transformer 18. This is necessary in order that contact disc I20 and contact disc I22 be in the position shown 7 Signal lamp II may preferably be a green lamp indicating that, so far, as the web control is concerned, things are normal.

If the web breaks, the circuit for I I1 is broken at

contacts

23 and 21. Contact disc I20 disengages its contacts and contact disc I22 engages its contacts. The result is that signal lamp H5 is energized through wire I2. This lamp may be a red lamp indicating the fact that the web is broken. The disengagement of contact disc I20 from its contacts, breaks the holding circuit for the relay winding I8 causing the main contactor to open, with the result that the machine comes to a stop. It will be noted, however, that the field of generator 61 is maintained energized, with the result that as it slows down to a stop, motor 3 will be driven in timed relation therewith so that the web will be properly wrapped on the tore up to the instant of complete standstill.

At the same time, the circuit for the shading coil 90 will be completed because the auxiliary of the armature circuit a contactor moves to open position simultaneously with the opening of the main contactor. The result is that the contact through wire 96 is closed so that the shading coil 90 will have its circuit completed as follows: from the righthand end thereof through wire 91, wire 96 including the contact therein, wire 92 to the other terminal of the shading coil 90. At this time, the

field 84 of the motor is energized through wire 81,

field 84, wire 86, wire 88, switch 81 which is now closed, wire 8! and wire 85, back to the other terminal of the secondary transformer 16. Thus, motor 85' is energized in the reverse direction so that the resistances in the armature circuit of motor 15 are gradually fully out into circuit.

.As the motor arrives at the end of its reverse stroke, switch 81 is open and switch 8| is closed. Likewise, switch If is moved back to the position shown in the drawings.

Similiar action occurs to stop the machine by opening normally closed stop switch I29. When this switch is open, assuming the apparatus running normally, the holding circuit for relay winding 1!! is broken, with the result that the main contactor opens, as well as the auxiliary contactor.

The previous description of the trouble light circuit and the heating circuit fully sets forth the nature and operation of this apparatus. To fully deenergize the entire apparatus, switch Ill and switch 63 may then be opened.

From the above description, it will be apparent that this invention resides in certain principles of construction and operation which may be embodied in other forms and carried out in other ways 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:

1. A web feeding combination comprising a motor, a generator connected thereto, circuits for energizing said motor, a main contactor in said circuits for controlling said motor, a serving head motor, circuits for energizing the serving head motor from said generator, circuits for controlling the main contactor including start and stop switches, a holding circuit for the main contactor, an electro-magnetically operated switch in said holding circuit, a web serving head operated by the serving head motor and a centrifugally operated switch for controlling the electromagnetically operated switch, said centrifugally operated switch being held against operation by the web.

2. A web feeding combination comprising a web serving head, a serving head motor, a motorgenerator, circuits for energizing the motor-generator including an electro-magnetically operated main contactor, connections for energizing the serving head motor from the generator, circuits including a start and stop switch for con-- trolling the main contactor, a holding circuit for the main contactor, a relay switch in the holding circuit, and a control circuit for the relay switch including a switch mounted on the serving head and normally held closed by the web.

3. A'web feeding combination comprising a web serving head, a serving head motor, a motorgenerator, circuits for energizing the motor-generator including an electro-magneticall: operated main contactor, connections for energizing the serving head motor from the generator, re-

Cal

versing switches in said connection for operating the serving head motion in either direction, circuits including a start and stop switch for controlling the main contactor, a holding circuit for the main contactor, a relay switch in the holding circuit and a control circuit for the relay switch including a switch mounted on the serving head and normally held closed by the web.

4. A web feeding combination comprising a web serving head, a serving head motor, a motor-' generator, circuits for energizing the motor-generator including an electro-magnetically operated main contactor, connections for energizing the serving head motor from the generator, circuits including a start and stop switch for controlling the main contactor, a holding circuit for the main contactor, a relay switch in the holding circuit, a control circuit for the relay switch including a switch mounted on the serving head and normally held closed by the web, an auxiliary contactor in circuit with the main contactor and its holding circuit, a motor operated rheostat connected to the motor of the motorgenerator and. circuits for the rheostat motor including the auxiliary contactor.

5. In a-flyer for machines of the type described, a rotatable support, a cop spindle journaled on said support for rotatably mounting a cop, a guide post secured to said support around which the web passes from the cop, a fixed contact mounted on and insulated from the post, a switch arm pivotally mounted on the post, an extension on said arm positioned to engage the web; a motor for operating the support, and means interconnecting said contact, switch arm and motor for stopping the motor when the switch arm is released by breakage of the web.