US2077183A - Magnetic means and method of tensioning - Google Patents

Description

April 13, 1937. E. G. PARV IN 2,077,183

MAGNETIC MEANS AND M ETQOD OF TENSIONING Filed Feb.6, 1936 2 Sheets-Sheet 1 :i H i a '7 7 l n -9 I M Q II F R f 5 /4 as za 26: a l /8 Z /\9 E E INVENTOR.

E Edward G Parvm ATTORNEYS.

April 13, 1937. E. G. PARVIN v I 2,077,183

MAGNETIC MEANS AND METHOD OF' TENSIONING Filed Feb. 6, 1936 2 Sheets-Sheet 2 INVENTOR. Edward G. Pan/[n BY 2 Q Q AZEFORNEA'S.

Patented Apr. 13, 1937 UNITED STATES MAGNETIC MEANS AND METHOD OF TENSIONING Edward G. Parvin, Roselle, N. J.', assignor, by

mesne assignments, to Syncrofl Machine Company, Newark, N. J., a corporation of New Jersey Application February 6, 1936, Serial No. 62,591

method by means of which a substantially constant and uniform tension may be maintained upon a web or strand being fed from the flyer of V a winding or wrapping machine.

The prime object of this invention is to provide means particularly in the form of an electromagnetic drag device for maintaining a substantially uniform tension upon a web or strand being fed from a fiyer cop.

A further object of this invention is to provide a method and means of this type for compensating for the loss and weight of the cop as the material is fed therefrom and its reduction in diameter. 7

These and many objects as will appear from the following disclosure are secured by means of this invention.

This invention resides substantially in the combination, construction, arrangement, relative location of parts, steps and series of steps, all as will be detailed below.

In the accompanying drawings,

Figure 1 is a vertical, central, cross-sectional view with some parts broken away of a portion of a winding machine flyer embodying the features of this invention;

Figures 2 and 3 are plan and side elevational views of the stator core for the magnetic drag device;

7 Figures 4 and 5 are plan and side elevational views of the pole piece for the stator core;

Figure 6 is a plan view of the rotor pole piece;

Figure 7 is a vertical, central, cross-sectional view therethrough; and

Figure 8 is a diagrammatic layout of the circuit arrangement of the device.

The invention is directed to that type of winding machine employing a serving head through which a strand, cord or wire passes longitudinally of its length and has wrapped thereon by the serving head a web or strand of covering material which is applied thereto in the form of a helical wrap comprising successive turns which may or may not overlap. Such a serving head rotates at high speed, usually on a vertical axis, upon which axis and on the fiyer is journaled a cop'spindle for supporting a cop or spool of the material to be applied in a helical wrap. Those skilled in the art fully appreciate that in the operation of such devices and particularly where the web or strand to be wrapped is of a delicate nature that the web or strand is subjectedto a varying tension because of the loss in weight '5 and reduction in diameter of the cop or spool as the material is fed therefrom. This variation in tension on the web or strand results in an uneven application of the material to the core and may often vary through such a wide range 0 as to result in breaking of the web or strand.

The basic object of this device is to provide a simple and automatically acting compensating device by means of which a uniform tension is maintained on theweb or strand by reason of compensation which is automatically provided to counteract the reduction in the diameter of the cop or spool. The full nature of the invention will be more readily appreciated after the structure has been described in detail.

a At l is shown a portion of a support, to. which is to be attached the serving head motor, not shown in the drawings. This motor is, attached to the support so as to depend therefrom and permit of attachment of the shaft of the motor to the spindle 2. Locked on this spindle by a pair of threaded lock nuts or rings 3 is a collar 4. This collar is connected by means of the ma-,

chine screws 1 to a plate or turntable ,5 so that. it will revolve with the spindle 2. The collar 4 is seated in a central recess in the central depending boss or hub 6 of the plate 5. I

The spindle 2 is provided with an extension 8 of reduced diameter that passes up through the plate 5 and through a central recess l4 in the top thereof. v Rotatably mounted on suitable bearing members as illustrated at It is the cop sleeve 9 which is locked in place on portion 8 of the spindle by means of a threaded ring ll. The cop s1eeve 9 is provided with a flange at the lower end thereof. The u per end of the por tion 8 of the spindleis provided with a suitable form of clutch and locking nut l2 by means, of which the nose piece, not shown but usually employed with these serving heads, is mounted in place.

Attached to the plate 5 in the recess I4 is a stator core 1510f magnetizable materiahsuch as steel or iron, built in the form of a cup having a central integral sleeve l6. Resting on the upper end of the sleeve i6 is the end thrust ball bearing 1 l3 upon which the loaded cop sleeve 9 rests so as to be freely rotatable upon the portion 8 of the spindle. As shown in Figure 2, the stator core is provided with a series of slots [5' for the purpose of reducing the eddy current losses in the core in accordance with common practice in the electrical arts. At 2! is a disc shaped cover for the stator l5 built somewhat in the form of a ring of magnetic material andnotched to provide the pole pieces Zia. This cover is fixedly securedito the. cup [5 and serves'to enclose the stator winding l1. One terminal l8 of the winding His connected to a collector ring l9. mounted'upon' aninsulating ring 20 secured to the hub 6. A, brush, not shown, is pr'ovidedfor completing the circuit to'the' ring H3. The other terminal of the winding ll, although not shown in Figure 1, is grounded on the frame of the machine. Secured to the flanged end of the cop sleeve 9 is the magnetic rotor 22 which is constructed in the form shown in Figures 6 and 7 and is notched at the periphery to provide the poles 22a. This rotor is secured to the flanged end of the cop spindle by means of the machine screws 23 for rotation therewith. The rotor is constructed so as to coincide axially with the stator poles 2Ia, as is clear from Figure 1.

At 24 is shown one of the several guide spindles commonly employed on a serving head around which the web passes in travelling from the cop or spool mounted on the cop sleeve to the nose piece. There is shown, although it forms no part of this invention but is disclosed in one form in the patent to Fantone and Jameson No. 2,044,160, issued June 16, 1936, a centrifugal switch which is connected to the control circuit of the serving head motor so as to stop if the web breaks. An insulated contact 25 is mounted on the guide post 24 and is connected by aninsulated conductor 26 to a collector ring 2'! mounted on the insulating ring 28. The other wire of the control circuit is grounded on the machine and the web in passing to the nose piece engages the pivotally mounted lever 29 so as to hold it out of engagement with the insulated contact 25 until the web breaks.

The circuit for the automatic tensioning device is shown in Figure 8. One terminal of the winding H is diagrammatically indicated as grounded on the machine by means of the lead 33. Its other terminal is connected by the wire l8 to the collector ring IS. The brush, not shown, which engages the ring 19 is connected by the wire 3! to the adjustable contact of a resistor 32. This resistor is connected by the wire 33 to a variable transformer 3 energized from a suitable source. The best practice prefers a relatively low voltage on the automatic tensioning device so that the connection 33 is taken from the secondary of the energizing transformer 34 at a point to provide about a 24 volt potential for the winding H.

In the operation of the device a cop or spool is mounted upon the cop spindle 9 so as to be rotatable with it. The end of the web or strand Wound on the cop is led around the guide post 24 and to the nose piece in a manner so as to engage lever 29 and hold it out of engagement with the contact 25. When the cop or spool is full it has a maximum diameter and a maximum weight so that the web fed therefrom in overcoming the inertia of it is under a tension which by proper proportioning of the various parts may be the desired tension. However, as the cop loses weight and diameter the tension on the web or strand will increase if no compensating device is employed.

It is likewise apparent that for a constant linear feed of the web or strand the cop sleeve will revolve at an increasing rate as the diameter of the cop is reduced. It is here noted, although well known in the art, that the fiyer motor causes rotation of the spindle 2 with its attached portion 8 and plate 5 with all the parts mounted thereon. In addition to this rotation, however, the cop sleeve rotates on its bearings l0 about the axis of the spindle. Advantage is taken of this fact in the invention. Since the cop sleeve has relative motion with respect to the spindle and plate the rotor 22 will have relative motion with respect to the magnetized stator I5. This stator is magnetized, it will be apparent from Figure 8, by the supply of energy from the secondary of transformer 34, through wire 33, resistor 32, wire 3|, ring l9, wire l8, and to ground at 33 through the winding l1. Thus the stator poles 2la will be energized and magnetizing currents will be induced in the rotor 22 which will magnetize it in a direction to oppose its relative rotation with respect to the stator poles. The magnitude of this reaction will, over a useful range, vary substantially uniformly with the variation in the speed of rotation of the rotor 22 with respect to the stator. When the stator is energized with alternating current the drag on the rotor 22 will decrease as the relative speed of rotation between the rotor and stator increases over a sufficiently Wide range to make it possible to take advantage of this fact by means varying the amount of resistance of resistor 32- included in the circuit of the stator winding I1.

It is to be noted, as will be apparent to those skilled in the art, that the invention herein disclosed is not limited to any particular type of winding or wrapping around. The invention may readily be applied for the purpose of maintaining a uniform tension in a strand, wire, cord or web of material being fed from a spool, cop, reel or coil of material regardless of the manner in which the material being fed is employed. In other words, the device may be employed in any mechanism wherein a uniform tension is maintained in a feeding web or strand to compensate for the reduction in diameter of the spool, cop, reel or coil from which it is being removed.

From the above description it will be apparent that this invention resides in certain principles of construction and methods of employing it which may be embodied in other physical forms and carried out in other ways without departure from the true scope of the invention. I do not, therefore, desire to be strictly limited to the disclosure presented for the purpose of illustrating the invention, but rather to the appended'claim.

What I desire to secure by United States Letters Patent is:

In a mechanism of the type described the combination comprising a spindle, a coil supporting sleeve journaled on said spindle, a magnetizable' member connected to said sleeve and having a plurality of poles, a magnetizable stator having a plurality of poles mounted on a fixed support with respect to said sleeve and adjacent said magnetizable member, and means for creating an alternating current magnetic field in said stator whereby increase in the speed of rotation of said sleeve as a coil mounted thereon is reduced in stantially uniform tension in the material fed from the coil.

EDWARD G. PARVIN.

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