US1583525A - Overrunning preventer for winding machines - Google Patents

Description

H. E. BRYANT OVERRUNNING PREVENTER FOR WINDING MACHINES May 4, 1926.

Filed Sep 16, 1925 Ill Patented May 4, 1926.

UNITED sr'rss PATENT creme HENRY E. BRYANT, OF PROVlDENCE, RHODE ISLAND, ASSIGNOR T TUBULAR WOVEN FABRIC COMPANY, OF PAWT'UCKET, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

OVERRUNNING PREVENTER FOR \VINDING MACHINES.

To all whom it may concern I Be it known that I, HENRY E. BRYANT, a

citizen of the United States, residing at' Providence, in the county of Providence and State of Rhode Island, have invented new and useful Improvements in Overrunning Preventers for \Vinding Machines, of which the following is a specification.

The present invention relates to machines for winding filamentous or strip material by the action or a rotating winding head carrying a supply of such material on an independently rotatable spool or the like. Its object is to prevent continued rotation of the spool after the winding head has beer. abruptly stopped or quickly retarded. For instance, assuming that the winding head is normally rotated at high speed, and that the machine is equippedv with a brake or other stop motion device for quickly arresting the motion" of the head when some untoward accident occurs, such as breaking of the stock being wound or its failure to be fed properly to the winding p0int,'then it is desirable to stop the rotation of the stock holding spool or reel also as soon as possible in order to prevent unwinding and snarling of the stock supply, or other danger liable to result from continued free rotation of the supply spool.

I have accomplishedthis object by providing in connection with the winding head and supply spool, in a machine of the character above indicated, an automatic stop or clutch device which is inope 'ative so long as the winding head continues to operate in its normal manner, and becomes operative instantly to arrest the spool when the winding head is itself arrested. The embodiment of the invention herein illustrated has been designed for use with a machine for winding strip material into tubular form, and particularly for making fi8X1bl8 metallic conduit or armor for electrical conductors; such a machine being disclosed in my pending application filed February 17, 1925, Serial No. 9,782. The drawings provided with this specification illustrate so much of the said machine as is sufiicient for explanation of the principles of the invention and the construction of the specific embodiment herein referred to. It is to be understood, however, that the invention is not limited to use with that specific machine, but is ap plicable also to other machines which in clude a rotating winding head, an indcpeinlently rotatable spool or equivalent stock holder, and means for stopping the winding head. V I

1n the drawings:

Figure 1 is a side elevation, with parts broken away and shown in section, of the machine above referred to having one embodiment of my overrunning prevention means applied thereto;

Fig. 2 is a fragmentary sectional view on an enlarged scale of that part ofthe machine which contains said overrunning pre-' vcntion means;

3 is a sectional view taken on the line 3-3 of Fig. 2 and viewed in the direction or the arrows applied to saidline;

Fig. 4- is a perspective detail of the clutch which embodies the form of overrunning prevention means shown in the preceding figures; I

Fig. 5 is a perspective view of a fragment of the winding head and'the stock holding spool, and including a modified form or clutch for preventing overrunning of the spool.

Like

same figures.

The part ofthe machine which I have called the winding head is that designated by he numeral 21 in the drawings. "It is secured on one end of a shaft 22 which roreference characters designate the tates in bearings 28 and 2% 011a base orr"ra1ne Such head may be driven by any suitable means, such as a motor 26 mounted on the frame and having a shaft which is coupled with theshaft 22 by a belt or chain -27 sprocket wheels.

The winding head is cylindrical in form, having an end wall 29 and an outer side wall 30. It also has an interior cylindrical bearingfsurface 81, the said outer walland earing being coaxial with the shaft 22. In the annular space between the bearing 31 and the wall is a spool holding the stock 32 and having a hub 33 surrounding and rotatable upon the bearing surface 31, and a flange or base. 34' bearing against end wall 29 or against roller bearings mounted in said and conipleniental pulleys or parts wherever they occur in all the end wall. The stock is drawn from the spool and carried around a guide roll 35, mounted on the head, and led thence to the winding point. The head is also equipped with stoclt feeding, forming and laying devices, for a full disclosure of which reference may be had to the aforesaid application; but as such disclosure is not essential to an explanation of the present invention, it is not repeated herein. The requirements of the present disclosure are met by the explanation that the winding head is rotatable and that the stoclcholding spool is carried by the head and is independently rotatable relatively thereto about the same axis.

The stool: shown illustratively herein is a metallic strip or ribbon wound in the term of a coil and mounted on the spool, surrounding the hub 33 thereof and bearing against the face or flange Such showing, however, is illustrative and typical rather than exclusive. The term spool which I have used herein is a generic term intended to include any device similar or equivalent to the so-called spool herein illustrated and adapted to hold a supply of stock in coil form.

lVhen the winding head is rotated to .t'orm the stock into the article of. manufacture which is the final product or the machine,

tionary parts of the machine and other objects, but at a different speed, the speed ditferential being due to the delivery of stock from the spool to supply the demands of the manufactured article or goods. spool rotates relatively to the winding head, and the direction of such relative rotation may be the same as, or opposite to, the direction in which the stock is wound to form the coil carried by the spool. The rotation of the head is much more rapid than the relative rotation of the spool, hence when the head is suddenly stopped the spool tends to continue on in the direction of its absolute rotation whether the relative rotation is in the same, or the opposite direction. Such continued rotation or over-running of the spool is liable to have more or less objectionable and serious results, well understood by those acquainted with the art. The object and accomplishment of the invention is to prevent such overrunning.

The direction of rotation of the winding head when winding the stock in the term of a right-hand helix is that indicated by the arrow A in Figure l and the arrow B in Figure 3. The coil of strip material is applied to the spool in such manner that as it is drawn oh? to satisfy the demands of the manufactured goods for the stock, it causes the relative rotation of the spool to take place in the direction indicated by the ar Thus the row G in Figure 1 and the arrow D in Figure 3. The direction of such relative rotation is opposite to the direction of rotation of the head. Nevertheless the speed of winding is so much greater than the speed of such relative rotation that the absolute rotation of the spool, by which I mean its rotation relatively to the stationary parts oi the machine and to other objects, is in the same direction as that of the head. lit follows, then, that whenthe head is suddenly arrested so that its rate of rotation is greatly reduced, it not instantly stopped, the direction of relative rotation ot the spool is reversethdue to the slowing down of the head while the spool continues to rotate with substantially undiminished velocity due to its momentum. I make use of this 'reversal of relative rotation to e'liect clutching oi the spool and head together when the head is arrested or stopped. I have shown herein two terms of mechanism for this purpose, which are alike in principle but specifically different in that one is a reversal of the other.

One form of such device is illustrated in Figures 1 to L and comprises a pawl, or preferably a plurality of pawls 86 set into recesses 37 in the central part of the winding head, and in any convenient location between the forward and rear ends of such central part, but preferably near the rear end thereof. These pawls are mounted on pivot pins 38. They have provision for a limited amount of swinging motion between the bounding walls of the recesses 37, and such bounding walls are so arranged that when the pawl lies against one of such walls its extremity is close to the bearing surface of the head, and does not project far enough from such bearing surface to impede movement of the spool in its normal direction of relative rotation; but when the pawl swings toward or against the opposite wall of the recess, its extremity projects "from the bearing surface far enough to engage abutments with which the spool is provided.

In the interior surface of the spool, and in that Zone of such surface which surrounds the pawls, are recesses or notches 39, the sides of which constitute the abutments above mentioned. Springs 40 are engaged with the pawls and with adjacent portions of the head, tending constantly to throw the pawls outwardly. lVhen the relative rota tion of the spool takes place in the normal direction, the notches, or equivalent abutments, pass successively over the pawls, and although the pawls may spring temporarily into such notches, they do not interfere with the movement of the spool because they are inclined in the same direction as the travel of the spool and the abutments simply push them aside and pass over them. But when the direction of relative motion is reversed,

. and any pawl enters in one of the notches 39, it interlocks. with the side-of the-"notch to the angular spacing between thenotches in the spools plus or minus a fractional part of such angular spacing. 'Thus, for instance, in the arrangement shown where there are three pawls, the angle. between each two of them is one and one-third times the angle between two adjacent notches. Thus the greatest lost motion which cantake place before the head and spool become clutched togetheris one-third of the spacing between the notches. By this means. a quick coupling. of the spool is insured with out requiring the notches to be excessively close together.

In the alternative or reversed mechanism shown in Figure 5, the equivalent pawls' 41 are pivoted to the winding head by means of pins 42 set into the end wall of the wind ing head and projecting forward near the circumferential wall thereof. These pawls overlap the rim of the spool and snap over abutments 4L3 projecting from the forward face of such rim, when the spool turns in the normal direction of relative rotation, indicated by the arrow E. The pawls have tail pieces 44 which are normally held by springs 4'5 against the other wall of the head, and prevent backward yielding of the pawls when the direction of relative rotation is reversed. Here also the pawls 'are spaced apart by an angular distance equal to that between the abutments 43 plus or minus a fraction of such angle.

It will be understood that in either form of the invention a single pawl will obtain the effect of clutching the spool in the circumstances indicated, but with the possibility of delay in so doing. It is also to be understood that if assurance of a quicker clutching efiect at any time is desired, more than two or three pawls may be provided and spaced according to the principles here'- in explained.

The clutching means herein disclosed is independent of the means for arresting the" winding head, andwill operate to prevent overrunning of the spool whenever the head is checked, whatever means are applied for the purpose" whether automatic or manual.

In Figure 1 there is indicated at 46 a de-' vice for arresting the head, which device may be the same as that shown for the purpose in my prior application Serial No.

9,782, or a different device, and which typi fies generally a means for that purpose. But since the'sp'ool clutching means of this invention is independent of the head stopping means, no description of any such stopping means is required'for, thisdisclo 'j sure. I V

In addition to the clutch means herein described, the machine may be equ pped with frictional traction means, such for instance as that shown in my'prior application Serial No. 9,782, for causing rotation of the spool with the head when the machine is started up and for maintaining.

sufiicient tension in the stock while the machine continues in normal opera-tion.

The means herein disclosed for preventing overrunning of the stock holding spool is one of several specifically different devices which I have devised for the same purpose. Two other forms of such means are disclosed in applications for patent filed concurrently herewith. This device is distinguished from one of those disclosed in said concurrent application by the fact that it is controlled and actuated primarily in consequence of a substantially slackening in the speed of the winding head, and not under the direct control of the stock or ofjthe means by which the head is arrested; while it is distinguished from the device shown in the other of said application, by being of a positive character, the last-named device be ing a friction clutch.

Having thus described the principles and certain specific embodiments of the invention, although without attempting to .deseribe all possible forms of the invention or all of its modes of use, I declare that what I claim and desire to secure by Letters Patent is: i

1. In a winding machine having a rotatable head, a spool mounted on said head and independently rotatable relatively thereto, and a clutch between the head'and spool adapted to couple the one to the other upon reversal of the direction ofrelative rotation'between them. i

, 2. In a winding machine a rotatable winding head, a supply spool mounted upon said head and rotatable thereon about the same axis, and a one-way clutch between the head and spool arranged to permit relative rota tion between them in one direction and to prevent such rotation in the opposite direction. i 3 r 3. A winding machine comprising a rotatable winding head, a supply spool mounted on said head, in axial relation thereto and rotatable relatively thereto about the same axis, the spool being caused to rotate relatively to the head in the opposite direction tothe rotation of the head in the normal operation of the machine, and a clutch be: tween the head and spool constructed to permit such relativev rotation and, to prevent relative rotation in the opposite direction.

4t. In a winding machine a winding head, a supply spool for the material being wound mounted on said head coaxially therewith land rotatable relatively thereto about the same axis, the machine and the said material being arranged to effect such relative rotation, during the normal running of the machine, in the opposite direction to the rotation of the head, and clutching means operable by a reversal in the direction of such relative rotation for preventing such re versed rotation.

5. In a machine of the character described a rotatable winding head, a supply spool carried by said head coaxially therewith and with provision for rotation relatively thereto, aclutch member mounted upon one of the elements constituted by said head and spool and being under the actuation of force tending constantly to engage the pawl with the other of said members, the latter mem er having abutments cooperative with the pawl, and the pawl being free to move in one direction far enough to permit passage by 01" said abutments, and being so restrained as to prevent passage of the abutments in the oppositedirection. V

6. in a winding machine of the character described, two coaxial members both rotatably mounted and having provision for relative rotation between them, one of said members being a winding head and the other being a supply spool carried by said head, a positive clutch device mounted on one of said members, abutments on the other member complemental to said clutch device, the clutch device being yieldingly mounted and displaceable by said abutments when said relative rotation occurs in one direction, and means for preventing displacement of the clutch device by the abutments when relative rotation occurs in the opposite direction.

In testimony whereol I have ailixe'd my signature.

HENRY E. BRYANT.

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