US2649253A - Bobbin hanger - Google Patents

Description

g- 1953 D. G. SOUSSLOFF ETAL 2,649,253

BOBBIN HANGER 2 Sheets-Sheet 1 Filed May 3, 1951 Patented Aug. 18, 1953 UNITED STATES PATENT ()FFICE BOBBIN HANGER Application May a, 1951, Serial No. 224,366

This invention relates to bobbin hangers for textile machinery, and more particularly to hanger brackets for bobbins or other yarn or thread packages, together with associated knock-off or stop-motion mechanism, especially as adapted for use in winding machines or as a part of the takeup assembly of twisting machines.

In winding machines of all types, and especially in precision twisters for handling a wide variety of knitting, weaving, and thread fibers, it is highly ployed have merely raised the takeup bobbins or yarn packages out of contact with the takeup driving rolls, and considerable difficulty has been experienced, first in detecting the displaced bobbin or package, and then in obtaining ready access to the package for finding the broken ends of the yarn. Also, in all of these prior installations, the handling and replacement of the bobbin and the resetting of the takeup mechanism have required the use of both hands of the operator.

The general object of the invention, therefore,

is to provide a novel and improved bobbin hanger and stop motion which is of simple construction and accurate and certain in operation, and which will obviate the difiiculties and deficiencies of the prior devices which have already been mentioned.

For example, in its preferred embodiments the invention contemplates the provision of knock-off or stop mechanism, by means of which, upon the breaking or exhaustion of the yarn, the bobbin will not only be moved from driving contact with the takeup roll but will be permitted to roll out to a forward position where it may be detected more readily and where it is much more accessible for finding the break and tying the thread ends. Means are also provided for quickly stopping the rotation of the bobbin when it is rolled out to such forward position, and the novel arrangement is such that the replacement of the bobbin in running position is so facilitated that the operation may be effected with one hand. For

15 Claims. (01. 24237) the latter purpose, the hanger brackets are so related to the roll-out guiding means that the bobbin gudgeons have a temporary resting place from which they may be moved to running posi tion merely by the depression of a stop-motion trigger bail which thus acts also as a manual reset lever.

Other objects and features of novelty will be apparent from the following specification when read in connection with the accompanying drawings in which one embodiment of the invention is illustrated by way of example.

In the drawings:

Figure l is a plan view of a bobbin hanger installation embodying the principles of the invention, the parts being shown in running position;

Figure 2 is a similar view of the installation in fired position;

Figure 3 is a vertical sectional view through a machine to which the novel hanger is applied, and showing in side elevation the hanger elements as they appear in running position;

Figure 4 is a similar View, taken from the opposite side of the hanger, the parts being in fired position;

Figure 5 is a view in horizontal section through the housing for the stop motion or knock-off mechanism, the latter being shown in plan view, the parts being in fired position;

Figure 6 is a view in side elevation of the mechanism in fired position, the hanger shaft being shown in section;

Figure '7 is a similar view of the mechanism in running position;

Figure 8 is a view in vertical section taken on line 8-4! of Figure 5, the parts being in fired position;

Figure 9 is a. similar view of the mechanism in which the hanger shaft and holding toggle elements are in running position but the knockoff and reset cam member has moved to a position where it is about to break the toggle and trip the stop-motion; and

Figure 10 is a fragmentary sectional View of the toggle taken on line iii-H! of Figure 9.

Although it will be apparent from the present specification that the principles of invention may be applied to a wide variety of winding devices, it is described herein in connection with a typical installation of takeup mechanism on an uptwister designed to produce uniform packages of precision twisted yarn. In such machines the yarn supply is taken from a package carried upon a vertical spindle adapted to rotate at a high rate of speed, say from about 7,000 to over 10,000 R. P. M. depending upon the turns of twist per inch and the type, size, and weight of package, The yarn is passed through a fixed centering eye and is traversed on the takeup bobbins by means of a traverse bar carrying a yarn guide of suitable construction. Adjacent the traverse bar there is disposed one arm of a bail operatively connected with the stop mechanism, and normally this bail is spring balanced to bear with a Very light pressure upon the thread or yarn as it is being traversed so that if the yarn breaks, the bail will be permitted to move in the direction toward which it is biased and will act as a trigger for precipitating the action of the knock-oil or stop-motion mechanism.

All of this is clearly shown in the first four figures of drawing in which a casing or housing ill carries the stop-motion mechanism and is bolted as at H to a transverse bar l2 which forms a part of the machine to which the mechanism is applied. The housing casting is provided with an extension l3 and a removable cover plate hi is applied to one side thereof.

Bobbin hanger brackets or arms 55 and H3 are carried upon the respective ends of the hanger shaft Iii which is adapted to rock in a bearing bore extending through the housing It) and its extension l3. The outwardly extending free ends of the hangers IE and is are provided with open notches or slots 59 for the reception of the trunnions or gudgeons 2c of the take-up bobbin 2 2. Bobbin 22 is provided with end flanges 23 and 24 and is adapted to receive layers of twisted yarn as clearly indicated at 25 in Figure 1 of the drawings.

Secured as at 2? to another transverse frame bar 28 of the machine are the roll-out brackets 29 and 3%, these brackets being approximately of an inverted U shape, one of the arms of each' bracket being secured to the bar 28 as already described. An intermediate arcuate surface 32 of each bracket forms a guide track centered on the shaft [8 for confining the bobbin gudgeons 29 to the sockets 59 of the brackets l during operation, and the other arms of the brackets 29 and til provide tracks 35 for guiding the gudgeons during the rollout of the bobbin. A cocking lug or finger S5 is formed upon the rollout bracket 29 at the outer end of the roll-out track 35 as clearly shown in Figures 2 and 4 of the drawings. This is for a purpose which will be described presently.

Fixed to the frame bar 28, as at St, is an angu lar wire member 39 which terminates in a centering eye lie through which the yarn or thread T passes to be engaged by the yarn guide 42 carried by the traverse bar M. The traverse bar is oscillated longitudinally in proper timed relationship to the prescribed traverse of the yarn T upon the bobbin 22.

During the traversing of the yarn upon the bobbin 22 as shown at 25 in Figure 1, the layers of yarn are in contact with the cork-covered takeup rolls it which are fixed upon the roll carrying shafts it driven by suitable mechanism associated with the machine.

An inspection of the first four figures of drawing will show the extreme positions of the knockoff bail 53 which also acts as a reset lever for the stop-motion. The bail '53 is U-shaped having two arms, one of the arms designated at 51 having bearing in the stop-motion housing [0 and its extension i3, and the other arm 52 adapted to underlie the yarn or thread T between the centering eye 50 and the traverse guide element 42. As will be described presently in more detail, the bail is urged by gentle spring action upwardly against the thread at the point indicated, and as long as the thread is being traversed upon the takeup bobbin 22 in the normal way, the bail will remain in this position.

If, however, the thread T were to break or the thread supply upon the spindle exhausted, the bail 50 will rotate around the axis of its arm 5! in a clockwise direction as viewed in Figure 3, or in a counterclockwise direction as seen in Figure 4 of the drawings. This will result in the hanger bracket shaft I8 being rocked in a similar upward direction so that the brackets l5 and i6 move from the position shown in Figures 1 and 3 to that shown in Figures 2 and i. During this movement the gudgeons 20 of the bobbin are confined within the bearing notches or recesses 19 by the tracks 32 of the brackets 29 and 30. Upon reaching the end position shown in Figures 2 and 4, however, the bearing recesses or sockets id have moved beyond the end of the tracks 32 and then the gudgeons 20, especially under the momentum given them by the fairly rapid upward movement of the hangers, move out of the bearings l9 and roll down the trackways 35 on the brackets 2s and 3%. Near the end of the tracks 35, one of the gudgeons 20 will strike the cocking finger 36 but the opposite gudgeon 20 will not be so obstructed, and thus the bobbin will be skewed or cocked as clearly shown in Figure 2 of the drawings and a portion of the end flange 24 of the bobbin will wedge against the inward side of the bracket 30 and any remaining rotation of the bobbin will be effectively terminated.

When the bobbin rolls out to the position shown in Figures 2 and 4, it will be readily noticed by the operator of a machine and he may then find the broken nd of the yarn carried by the bobbin and unite it with the end carried by the spindle and replace the bobbin in running position. The means and method of replacing the bobbin will be described in connection with the details of the stop-motion.

The stop-motion mechanism will be more readily understood from an inspection of Figures 5-9 inclusive of the drawings. As already stated, the brackets or hanger arms l5 and 16 are rigidly pinned or otherwise secured to the hanger rock shaft [8 and it will also be observed that the hanger arm I5 is provided with an enlarged eccentric hub IilA which carries a stud which enters the housing l0 and is adapted to be contacted by one of the operating levers of the stopmotion. The principal operating member is the three-armed lever 62 which is freely rotatably mounted upon the shaft 18. A generally downwardly extending cam arm 63 0f the lever is adapted to contact with and move the stud 60 of the hanger bracket assembly and control the knock-off movements of the bobbin hanger. An upwardly extending arm 65 of the compound lever 62 is provided with a pin 66 which is connected with a similar pin Bl fixed to the casing it, by means of a rather strong coil spring 68. This spring normally urges the lever 62 in a counterclockwise direction as viewed in Figures 6-9 inclusive and tends to urge the hanger stud 60 toward the angular anvil plat 10 which is secured to the housing wall by means of the screw I I.

The third arm of the compound lever 62 is designated 12 and is of a somewhat arcuate configuration, extending toward the left and downwardly as viewed in Figures 6-9. The end of the arm 12 is pivotally secured as at M to the upper member 15 of a toggle arrangement, the lower lever element of which is indicated at it. This lower link it of the toggle is pivoted to the casing I!) at H, and a pintle 18 hinges the two toggle elements together and also provides a stub shaft or axle for the cam roller 80. This toggle and cam roller assembly is shown to good advantage in Figure of the drawings. It will be seen that the upper toggle link is bifurcated to receive the lower member 16, the pintle 18 spanning the bifurcation and also extending laterally to provide rotative support for the cam roller 80. The upper portion of the link 15 is cut away and shouldered to receive the end of the lever arm E2. The lower link or latch element 1'6 is also providedwith a projecting nose 82 which is adapted to strike against a portion of the upper link 15 at the root of the bifurcation and to limit the extension of the toggle to a point just beyond dead center, this position being shown in Figures 7 and 9 of the drawings.

The upper or rock arm portion 5| of the bail has suitable bearing support in the housing It and upon its end there are rigidly fixed two arms. One of these arms comprises a reset cam element and is designated by the reference numeral 85. The other arm is a counterbalance arm designated 86 and is not only fixed to the shaft poris provided with a flange 89 at its upper end and this flange is connected by means of a coil spring 90 to the end of the balance adjusting screw 92 which is threaded through the enlargement 93 in the lower wall of the housing If] and locked in adjusted position by means of the nut B l.

When all of the parts are in normal running position as shown in Figures 1 and 3 of the drawings, the elements of the stop-motion within the housing iii assume the positions shown in Figure '7. The hanger brackets are directed downwardly within the control of the guide track 32, their position being suggested in Figure '7 by a line joining the centers of the shaft l8 and the stud 60. It will be noted that the stud rests against the nose of the cam arm 63 but that so far as the stop motion mechanism is concerned, the arms could swing upwardly if occasion demanded it. However, the weight of the hanger brackets and of the bobbin with its yarn package is suflicient to maintain normal driving contact with the takeup roll 45.

Referring again to Figure '7, it will be seen that the compound lever 62 is in its clockwise rotative position placing the spring 68 under tension and setting the toggle 15, it to a point just beyond dead center. Thus the hanger brackets are latched in operative position by the setting of the toggle.

It will be noted that the shank portion of the reset cam has a cam surface 95 adjacent its pivot point on the shaft 5! but eccentric thereto.

If the thread T were to break or the thread pressure upon the lower arm 52 of the bail 56 be removed, the spring iii) will rotate the lever combination 35, 86 carried by the arm 5| in a counterclockwise direction as viewed in Figures '7 and 9. After a short period of lost motion during which the reset arm 85 moves downwardly to the position shown in Figure 9, the cam surface 95 on the arm 35 will abut the cam roller 86, move it to the left, and break the toggle. Immediately the toggle is broken the relatively strong spring 68 will swing the compound lever 62 in a counterclockwise direction and the cam arm 63 will force the stud 6H upwardly against the anvil plate 10 and thus snap the bracket arms l5 and It, together with the bobbin 22, to the position shown in Figure 4 of the drawings. The several parts of th stop motion mechanism will then occupy the positions shown in Figures 5, 6 and 8 of the drawings. Then, as previously described, the gudgeons 20 of the bobbin 22 will roll out along the track 35 and the bobbin will be skewed at the end of its run as shown in Figure 2. q

After the cause of the interruption has been corrected, the mechanism may be very readily reset with a minimum of effort on the part of the operator. It will be noted that the lower lip I00 bounding the recess [9 is disposed a very slight distance below the level of the track 35 when the hanger brackets are in fired position as shown in Figure 4. Thus, when the device is to be reset, the bobbin gudgeons 20 are inserted in the recess [9 and they will remain in this position resting partly against the end of the track 32 which acts as a retaining shoulder for the bobbin while it is momentarily in this position. Then the operator, using the same hand if desired, moves the reset bail 5U downwardly toward the position shown in Figure 3. The immediate efiect of this movement is to cause the reset cam 85 to move in a clockwise direction from the position shown in Figures 6 and 8 to the position shown in Figure 7. The inner arcuate portion of the cam contacts the roller 88, moves it upwardly and serves to reset the toggle, the lever 62 in the meantime moving against the resistance of the spring 68 until the toggle has passed dead center. The resetting cam arm 63 of the lever 52 permits the stud 60 to move downwardly and thus the brackets i5 and i6 carrying the bobbin are lowered to running position near the lower end of the track 32 and in contact with the driving roll it. Operation is thus resumed with the thread T bearing upon the bail arm 52 thus retaining the tripping mechanism out of operation.

It will be readily perceived that many of the features of novelty of the invention may be em bodied in takeup hangers for yarn or thread packages of other types than those carried upon double flanged bobbins, for example, the hanger may comprise a single arm or bracket which sup ports a headless package.

Also, it will be clear that in the present specification and claims, the term yarn is employed in a general sense to applyto all kinds of strand or filamentary materials, whether textile or not; and the designation bobbin is to be construed to mean any type of carrier for yarn or thread packages permitted by the context.

It is understood that various changes and modifications may be made in the embodiment illustrated and described herein without departing from the scope of the invention as determined by the following claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

l. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, means for moving said bracket to said second position, a movable member operatively associated withsaid moving means for actuating said moving means and normally held against actuating movement by the yarn strand approaching the bobbin whereby upon breakage or exhaustion of said strand the bracket is moved to said second posi tion, means effecting the release of the bobbin from the bracket upon arrival at said second position, guiding means along which said bobbin may roll from said second position to an exposed third position where it and its burden of yarn are readily accessible for examination, adjustment, and repair.

2. The installation set forth in claim 1 in which there is provided means for returning said bracket from said second named to said first named position, open capless bearings in said bracket for receiving the gudgeons of the bobbin, fixed guide tracks disposed along the paths of the open ends of the gudgeon bearings from said first position to said second position to retain the gudgeons within the bearings until said second position is reached, downwardly inclined delivery tracks being provided for guiding said gudgeons from said second position to said third position, the respective second named tracks intersecting the first named tracks on either side of the bobbin position, the points of intersection of said tracks providing shoulders which are slightly higher than the lower faces of the gudgeon bearing notches when the bearing bracket is in said second position, whereby a bobbin may be replaced in said bracket temporarily with the gudgeons resting upon said bearing face and against said shoulder before returning said bracket to said first position, the shoulder being low enough to permit the gudgeons to be ejected upon said second named tracks upon arrival of the bobbins at said second position,

3. The installation as set forth in claim 2 in which said second named or delivery tracks embrace the ends of said bobbin during travel of the gudgeons thereon but are spaced slightly from the ends of the bobbin, in which one only of the second named tracks is provided with a stop projection at the end thereof against which the gudgeon on one side of said bobbin may strike and skew the bobbin so that one at least of the bobbin ends is wedged laterally against the other of said tracks and any residual spinning momentum of the bobbin dissipated.

4. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, means for moving said bracket to said second position, a movable member operatively associated with said moving means for actuating said -moving means and normally held against actuating movement by the yarn strand approaching the bobbin whereby upon breakage or exhaustion of said strand the bracket is moved to said second position, means effecting the release of the bobbin from the bracket upon arrival at said second position, guiding means along which said bobbin may roll from said second position to an exposed third position where it and its burden of yarn are readily accessible for examination, adjustment, and repair, and means adjacent said third position for braking any remanent rotation of the bobbin due to momentum imparted by said driving means.

. 5. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, means for moving said bracket to said second position, a movable member operatively associated with said moving means for actuating said moving means and normally held against actuating movement by the yarn strand approaching the bobbin whereby upon breakage or exhaustion of said strand the bracket is moved to said second position, a fixed guide track disposed along the path of movement of the bobbin while it is being carried from the first position to the second position, said track adapted to be contacted by a portion of the bobbin during said movement to retain it in supported relation with respect to said bracket, a second fixed track disposed at an angle to said first named track at the end thereof adjacent said second position and serving to support and guide said bobbin during its movement from said second position to a third position.

6. The installation as set forth in claim 5 in which means are provided for returning said bracket from said second position to said first position, and in which said second named track is downwardly inclined toward said third position and is provided with a shoulder at its initial end adjacent said second position, which shoulder provides a temporary rest surface for a bobbin replaced in said bracket when the latter is about to be carried from said second named position to said first named position during return movement thereof, said shoulder being of such minimum height as not to interfere with the release of the bobbin from said bracket at said second named position.

7. A discharge device for yarn bobbins or the like which are provided with axially projecting gudgeons and end flanges, said device including a pair of parallel tracks along which said bobbin may travel with a rotative speed faster than that corresponding to mere rolling contact with said tracks, the bobbin flanges adapted to move between said tracks with but slight clearance between the respective flanges and the tracks, a stop lug projecting from the delivery end of but one of said tracks in the path of travel of the corresponding gudgeon, whereby when the gudgeon on the obstructed track strikes the stop lug the bobbin will be skewed laterally and the end flanges will be wedged against the tracks and the rotative momentum of the bobbin will be dissipated.

8. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, spring means for urging said bracket toward said second position, means normally retaining said bracket in said running position, a trip lever adapted to be actuated automatically upon the occurrence of an abnormality in the operation of the machine to release said retaining means and permit the bracket to be moved to said second position, means effecting the release of the bobbin from the bracket upon arrival at said second position, and means actuated by manual reverse movement of said trip lever to move said bracket back to said initial position from said second posi- 'tion and at the same time to reset' the retainingmeans.

9. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, spring means for urging said bracket toward said second position, means normally retaining said bracket in said running position, a trip lever adapted to be actuated automatically upon the occurrence of an abnormality in the operation of the machine to release said retaining means and permit the bracket to be moved to said second position, means effecting the release of the bobbin from the bracket upon arrival at said second position, and means actuated by manual reverse movement of said trip lever to move said bracket back to said initial position from said second position and at the same time to reset the retaining means, and means associated with said bracket to afford temporary retention of a replaced bobbin on the bracket preparatory to the manual operation of the trip lever to return the bobbin to said first position.

10. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbinland adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, spring pressed means for urging said bracket toward said second position, means normally retaining said bracket in said running position, said last named means comprising a toggle which when'straightened restrains the spring pressed means and when broken permits the movement of the bracket to said second position, a trip and reset lever, operative connections between said lever and said toggle whereby movement of said lever in one direction acts to break the toggle and manual movement of said lever in the opposite direction serves to reset the toggle, said lever being disposed in a position in the installation to be moved in the first direction upon the occurrence of an abnormality in the operation of the machine. l

11. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, spring pressed means for urging said bracket toward said second position, means normally retaining said bracket in said running position, said last named means comprising a toggle which when straightened restrains the spring pressed means and when broken permits the movement of the bracket to said second position, a trip and reset lever member, cam surfaces on said lever member adapted to respectively contact portions of said toggle, one in order to break the toggle upon movement of the lever in one direction, and the other in order to reset the toggle upon manual movement of the lever in the opposite direction, said lever member being disposed in a position in the installation to be moved in the first direction upon the occurrence of an abnormality in the operation of the machine.

12. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, spring pressed means for urging said bracket toward said second position, means normally retaining said bracket in said running position, said last named means comprising a toggle which when straightened restrains the spring pressed means and when broken permits the movement of the bracket to said second position, a trip and reset lever member, cam surfaces on said lever member adapted to respectively contact portions of said toggle, one in order to break the toggle upon movement of the lever in one direction, and the other in order to reset the toggle upon manual movement of the lever member in the opposite direction, and spring means to urge said lever member toward toggle breaking position, the lever member being disposed in a position with respect to the remainder of the machine so that it is biased away from the influence of said last named spring means during normal operation of said machine but freed upon the occurrence of an abnormality in the operation of the machine.

13. A bobbin hanger installation for winding machines, twisters, and the like, comprising a pivoted bracket adapted to rotatably carry a bobbin and adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, spring pressed means for urging said bracket toward said second position, means normally retaining said bracket in said running position, said last named means comprising a toggle which when straightened restrains the spring pressed means and when broken permits the movement of the bracket to said second position, a trip and reset lever member, a cam projection at an intermediate point onthe toggle, a double cam element fixed with respect to said lever member and having two camming surfaces adapted to respectively contact portions of said toggle, one in order to break the toggle upon movement of the lever in one direction, and the other in order to reset the toggle upon manual movement of the lever member in the opposite direction, and spring means to urge said lever member toward toggle breaking position, the lever member being disposed in a position to be pressed by the yarn strand approaching the bobbin in a direction opposed to the bias of the last named spring means, whereby upon breakage or exhaustion of the strand the lever member will be freed to actuate the toggle breaking cam.

14. A bobbin hanger installation for winding machines, twisters, and the like, comprising a fixed support, a bracket pivoted in said support and adapted to rotatably carry a bobbin, said bracket adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be Wound thereon, a multiple-arm operating lever fulcrumed on said support, one arm of said lever operatively associated with said bracket to move it from one of said positions to the other, spring means connected with said operating lever to urge it in the direction to move the bracket from the first position toward the second position, another arm of said operating lever being pivotally connected 11 to one end of a toggle device, said toggle device consisting of two toggle links joined by a central pivot element and means pivotally connecting the remote end of the toggle device to a fixed point on the support, a cam roller on said central pivot element and an abutment on one of the links adapted to contact the other link just beyond dead center in the direction for rotating the operating lever in bracket-retracting direction against the influence of said spring to latch the toggle, a trip and reset bail pivoted on said support adjacent said toggle device, a cam yoke fixed to said bail and having two arms adapted to embrace said cam roller whereby movement of said bail in one direction causes the yoke to move the cam roller in a direction to extend and latch the toggle device to set the operating lever in opposition to said spring means in order to retain said bracket in the first or running position, and movement of the bail in the opposite direction serving to move the cam roller in the direction to break the toggle and permit the operating lever under the influence of said spring means to project the bracket to said second or release position, relatively weak spring means for biasing the bail toward toggle-breaking and bracket-releasing position, the free end of the bail being disposed in contact with the yarn strand approa'ching the bobbin to be wound thereon, and

restrained by said strand against the influence of 7 said second spring means, whereby upon breaking or exhaustion of the yarn the lever will be freed to actuate the toggle-breaking cam.

15. A bobbin hanger installation for winding machines, twisters, and the like comprising a to fixed support, a bracket pivoted in said support and adapted to rotatably carry a bobbin, said bracket adapted to be swung from an initial running position to a second or release position, driving means for rotating said bobbin in said initial position to cause yarn to be wound thereon, a multiple-arm operating lever fulcrumed on said support, one arm of said lever operatively associated with said bracket to move it from one of said positions to the other, spring means connected with said operating lever to urge it in the direction to move the bracket from the first position toward the second position, another arm of said operating lever being pivotally connected to one end of a toggle device, said toggle device consisting of two toggle links joined by a central pivot element and means pivotally connecting the remote end of the toggle device to a fixed point on the support, a cam projection at an intermediate point on said toggle device and latch means for stopping the movement of the toggle links just beyond dead center in the direction for rotating the operating lever in bracketretracting direction against the influence of said spring, a trip and reset bail pivoted on said support adjacent said toggle device, a cam yoke fixed to said bail and adapted to embrace said cam projection whereby movement of said bail in one direction causes the yoke to move the cam projection in a direction to extend and latch the toggle device to set the operating lever in opposition to said spring means in order to retain said bracket in the first or running position, and movement of the bail in the opposite direction serving to move the cam projection in the direction to break the toggle and permit the operating lever under the influence of said spring means to project the bracket to said second or release position, spring means for biasing the bail toward toggle-breaking and bracket-releasing position, the free end of the bail being disposed in contact with the yarn strand approaching the bobbin to be Wound thereon, and restrained by said strand against the influence of said second spring means, whereby upon breaking or exhaustion of the yarn the lever will be freed to actuate the toggle-breaking cam.

DIMITRI Gr. SOUSSLOFF. ARNOLD C. WHITE. RICHARD G. HILBERT.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 313,869 Horrocks Mar. 17, 1885 367,966 Dobson Aug. 19, 1887 2,026,067 Rowe Dec. 31, 1935 2,304,685 Franklin Dec. 8, 1942 FOREIGN PATENTS Number Country Date 886,319 France June 28, 1943

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