US2286722A - Stopping mechanism for yarn coning machines - Google Patents

Description

Jung 16,,1942.- w. e. FAW

STOPPING MECHA NISM FOR YARN CONING MACHINES Fild April 2,1941

INVENTOR WW y 4 225, ATTORNEYS WEMELL G. FAW

Patented June 16, 1942 STOPPING MECHANISM FOR YARN CONING MACHINES Wendell G. Faw, Kingsport, Tenn., assignor to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application April 2, 1941, Serial No. 386,496

14 Claims.

The present invention relates to a yarn winding machine, and more particularly to an improved form of stopping mechanism for such a machine.

One object of the invention is-the provision of a stoppage control mechanism which is supported in its operative position by the moving yarn to render the stopping mechanism ineifective, yet which automatically moves to a nonoperative position upon breaking of the yarn to allow the stopping mechanism to come into operation to stop the machine.

Another object of the invention is the provision of an auxiliary stop lever supported by the moving yarn and arranged to control the operation of the main or primary stop lever.

A further object of the invention is the provision of an auxiliary stop lever which has a sufficient mechanical advantage to enable the small force of the moving yarn to support a relative heavy counter-balanced stopping mechanism.

Still another object of the invention is the provision of an auxiliary stop mechanism which eliminates excessive spindle stoppage, unnecessary yarn waste, and defective cones.

Another object of the invention is the provision of an auxiliary stopping mechanism which will retain a fine degree of adjustment over long periods of time without necessitating constant readjustment;

Yet another object of the invention is the provision of an auxiliary stop lever mechanism which is so designed and positioned to materially reduce friction of the yarn passing thereover.

A still further object of the invention is the provision of auxiliary stop lever mechanism which is simple in construction, rugged, relatively inexpensive to manufacture highly effective in use, and easily applied to existing machines.-

To these and other ends, the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawing:

Fig. l is a side elevation view of a portion of a yarn-winding machine of the type used prior to the application of the device of the present invention;

Fig, 2 is a fragmentary view of a portion of the machine illustrated in Fig. 1, but on a larger scale than the latter, showing the stoppage control mechanism used on machines prior to the present invention;

Fig. 3 is a top plan view of a portion of a yarnwinding machine of the general type illustrated in Figs. 1 and 2, but showing the application thereto of an auxiliary stop lever control mechanism constructed in accordance with the present invention;

No. 363,620, filed August 31, 1940,,it was disclosed that the coefficient of friction of low-twist filament yarn is exceedingly high with respect to large smooth metallic guide surfaces. It was also shown in that application that the substitutions of small radius yarn guides for the previously used'large radius guides resulted in a material reduction of the yarn friction, and an appreciable improvement in the quality of the yarn.

The present invention relates to a further improvement' in a machine design which extends the advantage of these small radius guides, but is more specifically concerned with an improvement in the design of a stop motion for coning machine.

In a standard type of coning machine, the yarn I0 is withdrawn from a supply package or bobbin, not shown, and through a tension gate I l which applies a predetermined amount of tension to the yarn. This gate comprises, as well known, a pair of intermeshing members through which the yarn passes in a winding path, as shown in Fig, 2. As this tension gate is of a standard and well-known construction, a detailed description therefore is not deemed necessary to those in the art. Under operating conditions, the yarn l0 passing through the gate l l exerts a force which opposes the gate closing mechanism. The arrangement is such that under proper operating conditions a state of equilibrium exists between the gate closing force and the tension applied to the yarn. Under such conditions, it is possible to vary the yarn tension by merely controlling the pressure applied to the gate ll, all of which is well known to those in the art.

After the yarn leaves the gate II, it passes upwardly through a slub catcher, broadly designated by the numeral l2, then under a laterally extending member I3 of a stop lever l4 pivoted at IS on the machine frame, as clearly shown in Figs, 1 and 2. The yarn then moves upwardly and over a button guide I5 on a traverse back assemply I I, and is finally wound up on a cone I8 rotatably mounted on a spindle I9 driven in any suitable well-known manner with the machine driving mechanism. A star wheel 20 is operatively connected to the spindle I9 in any suitable well-known manner. The stop lever I4 is suitably weighted so that, when free, it may move in a clockwise direction about its pivot I5 to bring the free end 2| of the member 22 thereof into engagement with the teeth 23 of the star wheel 20 to contact the latter and thus arrest rotation of the spindle I9, as will be later more fully explained.

In order to build a good straight cone, it is desirable that the tension of the yarn be gradually decreased as the cone builds up so that the final tension will be about one-half of the starting or initial tension. To make this possible the cam which controls the tension lever 24 is connected to the traverse back II so that as the cone builds up, the traverse back moves away from the center of the cone, thus rotating the cam in a clockwise direction, as viewed in Fig. 1. This movement allows the tension lever to approach a vertical position, applying less and less tension to the yarn, all of which is well known to those familiar with the art of coning machines.

In the case of fine yarns, however, it is necessary to maintain a very low tension to prevent broken filaments, and in order to keep the density of the cone low enough. These tensions however, are sometimes difiicult to obtain. The tension of the gate II can be properly adjusted to give any desired tension, but there are other factors which enter into the problem. Fig. 2 shows the standard and well-known arrangement of the slub catcher and the stop motion parts through which the yarn I normally passes after leaving the tension gate I I. The slub catcher I2 consists of two parts, namely, a relatively wide thin plate 21 which is positioned with an edge 28 directly over the opening in the top of the tension gate I I and parallel to the bars 29 thereof, as shown in Fig. 2. Parallel to this blade and with its center in the same horizontal plane as the blade is a smooth polished rod 30. The yarn in passing through the space between the plate 21 and rod 30 has the slubs and knots removed therefrom, as is well known. Directly above the slub catcher I2 is a laterally extending arm l3 on the stop lever I4, as clearly shown in Fig. 2. The yarn passes under the arm I3 which lies parallel to the slub catcher parts and directly over the rod 33, see Fig. 2. The stop lever I 4 is restrained in its radial movement by a guard 3| which is adapted to engage the arm I3 and thus position the latter in front of the vertical center of the rod 38. With this construction, the yarn must pass around. the rod 30 in an arc of about 90 degrees, then reverse itself and pass around the arm I3 in an arc of about 60 degrees, as clearly shown in Fig. 2. When the yarn is running under tension, it causes the arm I3 to press against the guard 3 I. If, however, the yarn I0 breaks, the weighted arm I4 will be free and will then move in a clockwise direction about its center or pivot I to permit the end 2| of the member 22 thereof to engage the teeth 23 of the star wheel 22 to stop the spindle l9, as will be later explained.

On heavy denier and normal-twist yarns this arrangement works satisfactorily, but with light denier and low-twist yarn several difiiculties are encountered. In the first place, the light tension is sometimes insufficient.

' nearly empty bobbin.

which is necessary for small yarn (45-75 denier) is not suflicient to insure proper operation of the stop motion mechanism. The lever I l must be counterbalanced so that it tends to move forward to engage the star wheel 20 when the tension on the yarn is removed, as when the yarn breaks. The weight applied to the lever I4 must be sufficient to insure positive engagement with the star wheel 20. The relatively small component of force applied by the yarn to balance this weight This is particularly true in the case of the light tensions necessary for nearly full cones. The result is that the cone stops unnecessarily as the yarn tension grows lighter. On the other hand, if the counterbalance weight of the lever I 4 is shifted so that a smaller force is required to prevent stopping of the spindle, the spindle may not stop when the end of the yarn breaks down. In that case, unnecessary waste is produced, or the end may be picked up by the cone and continue to run, leaving a loose end on the cone. The latter defect is particularly objectionable because it cannot be detected until the yarn is withdrawn from the cone for subsequent processing. In the past, it has been necessary to constantly adjust the stop motion mechanism when running light denier yarn. The best efforts in this respect, however, have not prevented excessive spindle stopping, unnecessary yarn waste, or defective cones.

Another difiiculty that has been encountered in practice is that it has not been possible to control the yarn tension close enough to obtain a constantly decreasing tension with respect to cone size. This is due to several factors. In the first place, the withdrawal tension, caused by ballooning around the head of the bobbin, varies with winding speed, which, in turn, varies with cone size. Thus, the tension below the tension gate increases as the size of the cone increases. Furthermore, the coefficient of friction of the yarn with respect to the various guides also increases with the winding speed or cone size. As long as the tension applied by the tension gate I I is greater than the withdrawal tension, these differences will be balanced out and the total tension above the gate I I will be strictly proportional to the force applied by the tension lever 24. However, after leaving the tension gate, the yarn must pass over the relatively large fixed surfaces of the slub catcher and the arms I3 of the stop lever I4. Frictional contact at these points tends to multiply the tension applied by the gate II.

It has been found that the tension above the stop lever I4 is considerably higher than the actual tension applied by the gate I I, depending, of course, on the coefiicient of friction of the yarn and the winding speed. This factor is greatest for low twist yarn and high winding speeds. The bobbin Withdrawal tension increases with withdrawal speed and with decrease in bobbin size, Consequently, this tension reaches a maximum for a full cone being wound from a This, however, is the point at which minimum spindle tension is required. To compensate for this change in withdrawal tension, the minimum tension applied by the gate II must be greater than the maximum applied at the bobbin. Even though these tensions are of relatively low magnitude, they are multiplied by the slub catcher and the stop lever assembly. Furthermore, this multiplication increases with winding speed so that it reaches a maximum when the cone is full, the point at which minimum tension is required. As a result of all these factors, it has not been possible, in the past, to obtain controlled tension throughout the building of the cone for light denier or low twist yarns without having the final tension on the cone too high.

In practice, it has been necessary to use the tension gate I I only for the first half of the cone, allowing the gate to stand open during the last half, With this arrangement, it is not possible to obtain a correct rate of tension let-off. The tension rises at first due to an increase of the winding speed. When, however, there is about a half-inch of yarn on the cone, the gate starts to open and the tension drops gradually, the gate reaching the open position when about one inch of yarn is on the cone. From that point on, the tension is controlled only by the drag of the yarn on the bobbin and the multiplication of the stop lever. Therefore, during the last third of the cone winding, the tension rises. Furthermore, the tension secured when winding from a full bobbin is quite different from that secured when winding from a nearly empty bobbin. In addition, during the building of the cone, it is sometimes necessary to change an empty bobbin for a full bobbin, thus creating a sudden change in tension. As a result of theseirregularities in the application of tension, it has been found difiioult, if not impossible, to build a cone without rings, bulges, and other unsightly defects. Also, the high tension which'prevails during the first third of the cone, often causes broken filaments and other quality defects.

After extensive tests, it was found that the above undesirable conditions could be greatly improved by altering the path of the yarn through to the slub catcher. To secure this result, the present invention provides a new and improved stop motion mechanism shown in Figs. 3 to 5. In the preferred embodiment of the invention, a cast-iron L-shaped bracket 35 is mounted on the machine frame in place of the old type guard 3| shown in Figs. 1 and 2. This bracket lies directly above the slub catcher parts 21 and 30, as best shown in Fig. 4. A channel-shaped member has the bottom 35 thereof suitably secured to the bracket 35, while the spaced sides 31 afford bearings for a rockable lever 38. The latter may be broadly termed an auxiliary stop lever and has one end formed with a vertically extending portion 39 which terminates in a horizontal section 40 which lies above and in vertical alignment with and substantially parallel to the slub catcher opening, as shown in Fig. 4. This horizontal section is channel-shaped, as best shown in Fig. 3, so that the yarn 'l [I may play back and forth along its length-being constrained by the right-angle bends 4i and 42 thereof, see Fig. 3. The portions 39 and 4!] thus provide a relatively large offset portion formed at one end of the lever 38. The other end of the latter is, on the other hand, formed with a relatively short inclined section 43 which terminates in a horizontal section 44 which extends under and serves to support the free end of the other arm 45 of the stop lever M which is pivoted at l5, shown in Figs, 1 and 2. The stop lever [4 shown in Figs. 3 and 5 is mounted and functions in the same manner as the stop lever I4 shown in Figs. 1 and 2 except that in the improved arrangement the lever I4 is supported by the portion 44 of the auxiliary stop lever 38 rather than by the yarn II), as shown in Figs. 1 and 2.

This auxiliary stop lever operates as follows: The yarn passes vertically out of the slub catcher l2, see Fig. 4, to the yarn guide member 40 which is positioned in vertical alignment with the slub catcher opening, as clearly shown in Fig. 4. At this point, the yarn makes a 45-degree turn to the left and passes directly to the button guide It, not shown in Fig. 4. Thus the yarn exerts a leftward force which tends to hold the vertical portion 39 of the lever 38 against a stop or positioning member 46 which is adjustably mounted on avertical leg 41 of the bracket 35, see Fig. 4. In this position, the section 44 of the lever 38 engages and supports the arm 45 of the pivoted stop lever 14 to retain the end 2| of the arm 22 thereof in its inoperative position and out of engagement with the star wheel 2, as will be apparent from inspection of Figs. 1 and 4.

The spindle l9, when at rest, is held by a brake, not shown. A starting handle, also not shown, is arranged to release the brake; and, at the same time, engage the spindle pulley with a driving belt. The starting handle is held in running position by a latch which engages a section of the starting mechanism. If this latch is moved upward, the starting handle is released, and a spring returns it to its original position, thus releasing the spindle drive and applying the brake at the same time. As this structure is of standard construction and well known in the art, and does not constitute per se a part of the present invention, a showing thereof is not deemed necessary for those familiar with such winding machines to fully understand the present invention.

As in prior constructions, the stop lever I4 is mounted with its pivot l5 attached to the abovementioned latch, not shown, so that the pivot 15 moves up and down with the latch. The stop lever I4 is suitably counter-balanced, in a well known manner, so that it tends to move in a clockwise direction about its pivot I5. The arm 22 of lever i4 is, however, normally held in its inoperative position by reason of the force applied by the passage of the yarn if! over the yarn guide member 4 as pointed out above. If, however, the yarn should break, the leftward force against the yarn guide lil is thus removed and the lever 38 will rock in a clockwise direction, as shown by the arrows in Fig, 4. This movement will cause the section 44 to move out of supporting relation with the arm 45 of the stop lever M to free the latter. The movement of the lever 38 is, however, limited by an inclined stop lug 43 which extends upwardly from the bracket 35, as best shown in Fig. 4 and in a position to engage the portion 3%! of the lever 38. The lug 48 thus cooperate with the adjustable stop 46 to limit the rocking movement of the lever 38.

As the lever I4 is now free, it will move in a clockwise direction about its pivot, being limited in such movement by reason of the engagement of the end of the arm 45 with the short oifset portion 44 of the lever 38. As the lever It thus moves, the end 2! of the arm 22 will contact the teeth 23 of the star wheel 25. The rotation of the latter will move the pivot l5, and the latch to which it is connected, upward to thus release the latch and stop the spindle.

The stop lever l4 must be heavy enough so that it can withstand the shock of contact with the star wheel to stop the spindle l9 without being bent or thrown out of alignment. Consequently, a relatively heavy counter-balance weight must be used to insure positive engagement of the lever 14 with the star wheel. However, the tension used on fine denier yarns is not sufiicient to balance such a weighted stop lever. However, the difference in lengths of the ofiset portions 39 and 43 of the lever 38 provides a mechanical advantage which makes it possible to support the weight of the stop lever l4 with a relatively small force applied by the yarn on the guide 40 of the lever 38. Another factor which helps make this possible is that the lever 38 is positioned or adjusted by means of the stop 46 to a point of unstable equilibrium. By this is meant, that if the weight of the lever I4 were removed from the section 44, the lever 38 would almost stand erect Without the pull of the yarn on the guide 49. Due to this mechanical advantage, however, a small force applied by the yarn at the guide 48 is sufficient to support the arm 45 to retain the lever I4 out of engagement with the star wheel 20. If, however, the yarn breaks, the force on the guide 40 is removed, and the lever 38 starts to move in the direction of the arrows in Fig. 4, thus upsetting the previous condition of equilibrium between the yarn force and the weight of the lever M. The weight of the lever 38 then comes into play to move the lever 33 to its extreme position against the stop 48 to move the section 44 out of supporting relation with the arm 45 of the stop lever I4. As the latter is now free, it will move about its pivot l5 and into engagement with the star wheel 2%! to stop the motion of the spindle l9, as pointed out above. Extensive tests have proved that the above-described mechanism is positive in its action, and easy to adjust even for light tension. Furthermore, it retains a fine adjustment over long periods of time without necessitating constant readjustment. Finally by the use of this auxiliary stop lever arrangement, the machine efliciency has been increased and the yarn quality improved.

An important feature of the above auxiliary stop lever mechanism is the reduction in friction. Referring to Fig. 4, it is seen that the yarn it passes vertically out of the slub catcher I2, and, therefore, does not have an arc of contact with the rod 30, as in the prior constructions shown in Figs. 1 and 2. Furthermore, only a small arc of contact is maintained with the guide 40 on the lever 38. Thus, the total friction caused by the slub catcher and the auxiliary stop lever is only a fraction of that obtained in the prior arrangement, illustrated in Figs. 1 and 2. As a result of the auxiliary stop lever of the present invention, it has been possible to obtain tensions approaching the theoretically correct values. Practically the entire tension on the yarn is applied by the tension gate II where it is possible to obtain perfect control, compensating for differences of withdrawal speed and bobbin sizes. Furthermore, this improvement in tension control has made it possible to practically eliminate certain winding defects such as bulged cones, soft rings, broken filaments, excessive knots, and filament loops. Although this new auxiliary stop lever arrangement is most helpful for low twist or light denier yarns, it also can be used to good advantage with other types of yarn. To secure the best results, the yarn guide portion 40 of the lever 38 should be of relatively small diameter, preferably not over 0.10 of an inch. The ratio of the offset portions 39 and 43 may be of any desired value from 2 to or even higher. In practice, however, the necessary mechanical advantage has been secured by making the ratio of these memberspreferably somewhere between 5 and. 7.

The present invention thus provides an auxiliary stop lever arrangement in which the yarn surface contacts have been reduced to a minimum so that the yarn tension may be controlled by the balanced tension gate, and low tension may be obtained for yarns having a high coeflicient of' friction. Furthermore, the auxiliary stop lever has a sufiicient mechanical advantage which enables a small yarn force to support a heavily counter-balanced stopping mechanism.

Such an arrangement also eliminates excessive spindle stoppage, unnecessary yarn waste, and defective cones. This auxiliary stop lever arrangement is simple in construction, rugged, effective in operation, and adapted for easy application to existing machines.

While one embodiment of the invention has been disclosed, it is to be understood that the invention idea may be carried out in a number of ways. This application is therefore not to be limited to the precise details described, but is intended to cover all variations and modifications thereof falling within the scope of the appended claims.

I claim:

1. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotating member operatively connected to said spindle, an arm pivotally mounted on said machine and movable into engagement with said member to be moved thereby to stop said spindle, of a lever swingably mounted on said machine and formed with a portion adapted to engage and support said" arm to retain the latter out of engagement with said rotating member, and another portion of said lever positioned to be engaged by said yarn so that the latter will be effective in supporting said lever to retain said first portion in supporting engagement with said arm.

2. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, spindle stopping means including an arm pivotally mounted on said machine, of a member swingably mounted on said machine and supported by said yarn in a position to engage and support said arm so asto render said stopping means ineffective, the breakage of said yarn serving to remove the support for said member to permit the latter to move out of supporting relation with said arm to thus render the stopping mean effective to arrest said spindle.

3. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, spindle stopping means including an arm pivotally mounted on said machine, of a member swingably mounted on said machine and supported by said yarn in a position to engage and support said arm so as to render said stopping means ineffective, and means for positioning said member to retain the latter in supporting relation with said arm, the breakage of said yarn serving to remove the support for said member to permit the latter to move out of supporting relation with said arm to thus render the stopping means efiective to arrest said spindle.

4. In a yarn winding machine, the combination with a rotating spindle on which a yarn pivotally mounted on said machine, of a member swingably mounted on said machine and supported by said yarn in a position to engage and support said arm so as to render said stopping means ineffective, and an adjustable stop on said machine positioned to engage said member to retain the latter in arm supporting position, the breakage of said yarn serving to remove the support for said member to permit the latter to move away from said stop and out of supporting relation with said arm to thus render the stopping means efiective to arrest said spindle.

5. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotating member operatively connected to said spindle, an arm pivotally mounted on said machine and movable into engagement with said member to be moved thereby to stop said spindle, of a lever rockably mounted on said machine and formed with a portion adapted to engage and support said arm to hold the latter out of engagement with said rotating member, and a yarn guiding portion on said lever adapted to be engaged and supported by said yarn to retain said first portion in supporting relation with said arm.

6. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotating member operatively connected to said spindle, an arm pivotally mounted on said ma chine and movable into engagement with said member to be moved thereby to stop said spindle, of a lever rockably mounted on said machine, an offset portion formed on said lever and positioned to engage and support said arm to hold the latter out of engagement with said rotating member, and a second offset portion on said lever adapted to engage and guide said yarn, the engagement of said yarn with said second portion serving to support said lever to retain said first portion in engagement with said arm.

7. In a yarn winding machine, the combination With a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotating member operatively connected to said spindle, an arm pivotally mounted on said machine and movable into engagement with said member to be moved thereby to stop said spindle, of a lever rockably mounted on said machine,

a small offset portion formed on one end of said lever and positioned to engage and support said arm to retain the latter out of engagement with said rotating member, a large offset portion formed on the other end of said lever, and a thread guide portion formed on said large portion and so arranged that the passage of the yarn thereover serves to support said lever in a position to retain said small ofiset portion in supporting relation with said arm, the breakage of the yarn freeing said lever so that the latter may rock to move said small portion out of supporting engagement with said arm so that the latter may move into engagement with said rotating member to stop said spindle.

8. In a yarn winding machine, the combination with a rotating spindle on which a yarn Winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotating member operatively connected to said spindle, an arm pivotally mounted on said machine and movable into engagement with said member to be moved thereby to stop said spindle, of a lever rockably mounted on said machine, a small offset portion formed on one end of said lever and positioned to engage and support said arm to retain the latter out of engagement with said rotating member, a large offset portion formed on the other end of said lever, a thread guide formed on said large portion, and an adjustable stop mounted on said machine and adapted to engage said large portion to adjust said lever to a point such that the breakage of the yarn will cause said lever to rock to move said small portion out of supporting relation with said arm to allow the latter to move into engagement with said rotating member to stop said spindle.

9. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotatable toothed member operatively connected to said spindle, a primary stop lever pivotally mounted on said machine and having a part thereof adapted to normally move into engagement with said toothed member to be moved thereby to arrest rotation of said spindle, of an auxiliary stop lever swingably mounted on said machine and supported by said yarn and positioned to engage said primary stop lever to positively retain said part thereof out of engagement with said toothed member.

10. In a yarn winding machine, thecombination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotatable toothed member operatively connected to said spindle, a primary stop lever pivotally mounted on said machine and having a part thereof adapted to rockably move into engage ment with said toothed member to be moved thereby to arrest rotation of said spindle, of an auxiliary stop layer swingably mounted on said machine and supported by said yarn and positioned to engage said primary stop lever to positively retain said part thereof out of engagement with said toothed member, and means for positioning said auxiliary stop lever.

11. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotatable toothed member operatively connected to said spindle, a primary stop lever pivotally mounted on said machine and having a part thereof adapted to rockably move into engagement with said toothed member to be moved thereby to arrest rotation of said spindle, of an auxiliary stop lever swingably mounted on said machine, a small ofiset portion formed on one end. of said auxiliary lever and adapted to be positioned to engage and support said primary lever to retain said part thereof out of engagement with said toothed member, and a large offset portion formed on the opposite side of said auxiliary lever and providing a guide over which the yarn moves, the movement of said yarn over said guide serving to rock said auxiliary lever in one direction to retain said small ofiset portion in supporting engagement with said primary lever and the breakage of said yarn serving to release said auxiliary lever so that the latter may rock in the opposite direction to move said small portion away from said primary lever so that the latter may pivot to move said part into looking engagement with said toothed member to arrest the rotation of said spindle.

12. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotatable toothed member operatively connected to said spindle, an arm pivotally mounted on said machine and movable into engagement with said toothed member to be moved thereby to stop said spindle, a yarn tensioning device, a slub catcher formed with a yarn opening positioned in vertical alignment with a top opening in said tensioning device, of a lever rockably mounted on said machine, an offset end portion formed on said lever and adapted to engage and support said arm to hold the latter out of engagement with said toothed member, and an ofiset yarn guide formed on the other end of said member and positioned substantially in vertical alignment with the yarn opening of said slub catcher,

the passage of said yarn over said guide serving to rock said lever to retain said first offset in supporting engagement with said arm.

l3. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up th yarn in successive convolutions on said cone, a rotatable toothed member operatively connected to said spindle, an arm pivotally mounted on said machine and movable into engagement with said toothed member to be moved thereby to stop said spindle, a yarn tensioning device, 'a slub catcher formed with a yarn opening positioned in vertical alignment with a top opening in said tensioning device, of a lever rockabl mounted on said machine, an offset end portion formed on said lever and adapted to engage and support said arm to hold the latter out of engagement with said toothed member, an ofiset yarn guide formed on the other end of said member and positioned above the opening of said slub catcher so as to be engaged and supported by the yarn moving thereover to hold said first'ofiset portion in arm supporting position, and means engaging said last mentioned offset portion to maintain said guide in substantial vertical alignment with said slub catcher opening.

14. In a yarn winding machine, the combination with a rotating spindle on which a yarn winding cone is mounted for rotation to wind up the yarn in successive convolutions on said cone, a rotatable toothed member operatively connected to said spindle, an arm pivotally mounted on said machine and movable into engagement with said toothed member to be moved thereby to stop said spindle, a yarn tensioning device, a slub catcher formed with a yarn opening positioned in vertical alignment with a top opening in said tensioning device, of a lever formed with an intermediate portion rockably mounted on said machine adjacent said slub catcher, a small 01T- set end portion formed on said lever and adapted to engage and support said arm to hold the latter out of engagement with said toothed member, a large offset portion formed on the other end of said lever, a yarn guide formed on said last mentioned portion positioned above said slub catcher, a stop adapted to engage said large offset portion to retain said guide in vertical alignment with said slub catcher opening, the movement of said yarn over said guide serving to hold said large portion in engagement with said stop to retain'said small portion in supporting relation with said arm, but the breakage of the yarn serving to free said lever so that said large ofiset will become effective to rock said lever in the opposite direction to move said small offset away from said arm so that the latter may move into locking engagement with said toothed member to stop rotation of said spindle.

WENDELL G. FAW.

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