US1354084A - Bobbin for braiding-machines - Google Patents

Description

C. WILDI. 11055111 FOR 511111111110 MACHINES.

. APPLICATION FILED SEPT. 11. 1919. 1,354,084, PatentedSept. 28, 1920.

2 SHEETSSHEET I.

F245 )M z I 1,354,0 4, PatentedSept. 28,1920.

C. WILDI.

BOBBIN FOR BRAIDING MACHINES.

APPLICATION FILED SEPT. |1..1919.

2 SHEETSSHEET 2.

PATENT OFFICE.

UNITED STATES CARL WILDI, OF WOHLEN, SWITZERLAND, AS-SIGNOR TO THE FIRM OF ARGOVIA A.-G., OF MELLINGEN, SVFITZERLAND.

BOBBIN FOR BRAIDING-MACHINES.

Application filed September 11, 1919.

To all whom it may concern:

Be it known that ILCA'RL VILDI, a citi- Zen of the Republic of Switzerland, residing at lVohlen, Aargau, Valtenswilerstrasse,

Switzerland, have invented certain new and useful Improvements in Bobbins for Braiding-Machines; and I do hereby declare the following to be a clear, full, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

In some braiding machines in which the bobbins are caused to'travel along sinuous guide curves the yarn holder carrying the yarn or thread rotatably mounted thereon is designed as a tube or quill, and the tension device is a weight or spring,usually mounted on said tube. This arrangement presents disadvantages when the thread has to be pulled oil, and the quantity of yarn that can be wound on the tube or quill is considerably reduced owing to the large diameter that has to be given to said tube or quill.

In another kind of bobbin of the type referred to the thread is wound on a solid core or spindle provided with locking teeth at its bottom. The locking mechanism is thus arranged beneath the yarn so that the latter has to be shifted vertically to an amount corresponding to the space taken up by the locking mechanism. The result of this is a considerable increase of the height of the whole bobbin and a more complicated design of the locking mechanism.

In a further type of bobbin of the class referred to the tube or spool for the yarn projects upwardly beyond the yarn and is used for the mounting of the locking mechanism; this involves either a too great diameter of the tube or spool or it renders the removal of the empty tube or spool and the putting on of a full bobbin more difiicult. I

Finally, in a fourth type of bobbin the mechanism for the gradual delivery of the thread, as well as the thread guard, are ar- I ranged wholly outside the diameter of the bobbin. The locking member of this bobbin engages into the toothed portion of the "nObblIl spool but is moved in vertical direc- Specification of Letters Patent.

Patented Sept. 28, 1921,.

Serial No. 323 217.

tion. As a result of this the spool cannot be designed so as to pass through the whole bobb1n, and a very complicated arrangement has to be provided in order to allow the bobbin to swing sidewise, or, in case the spool passes through the whole bobbin and serves only as a bearing for the latter, very inconvenient steps, involving a great loss of time, have to be carried out for exchanging bobbins, as a portion of the bobbin has to be wholly removed therefrom or at least turned up.

Moreover, the design of all the abovementioned constructions meets only the requirements occurring at low speeds, and will not do for very high speeds of braiding machines, as the single parts of the bobbins referredto cannot resist the very high stresses occurring when the machine runs at a very high speed, (for instance at 300 revolutions of the fly-wheel per minute).

The object of this invention is to provide a bobbin for braiding machines not presenting any of the above mentioned disadvantages.

To this end the bobbin according to this invention comprises a device for the gradual delivery of the thread having a locking lever pivoted on a tension standard which is arranged together with a thread guard and take-up mechanism at such a distance from the axis of the bobbin that it is situated beyond the periphery of the fully wound or loaded tube, quill or spool. The locking lever itself is engaged by the thread and is caused by the tension of the thread to engage from one side a member or ratchet for the gradual delivery of the thread provided on the yarn carrier, whether spool or quill, and this lever is so arranged as to swing beyond the maximum diameter of a fully wound bobbin to be placed on and an empty one removed from the bobbin carrier without manipulations of any kind.

The present invention also solves the problem of providing a bobbin for high speed braiding machines requiring very simple handling, with a very advantageous and very strong construction of all parts, whereby the number of the different parts is reduced to the smallest number.

The invention will now be particularly described with reference to the accompanying this invention, and

drawings, which illustrate, by way of example, several modes of carrying the inven- 7 tion into effect. In these drawings- Figure 1 illustrates a front view of a first construction according to this invention,

Fig. 2 is a side view of this bobbin seen from the right hand side of Fig. 1

storage of threadwound upon a yarn holder consisting of a thin tube or quill a. The latter, which may be made of card-board, is pushed onto and frictionally held on a sec ond tube (Z provided at its upper end with a toothed disk (1 formed integral withthis The disk cl as well as the tube (Z tube. I

The tube cZ may be made of sheet metal.

'is so shaped that it securely maintains in proper position the quill 0 pushed on it by hand. The tube (Z is loose on the spindle a.

' sisting of a piece of metal 7 mounted on the V 40 l follows "e designates a post carrying'the locking lever or pawl 70 is (forming a part of a mechanism for the gradual delivery of thread from the bobbin 6) and the'device for equalizing the tension or pull of the thread and the take-up. The post 6 also carries the thread guard or detector, conlower end of the post e and vertically movable thereon. 9 1s a take-up spring secured at its lower end to the thread guard 7' and" serving to take up the thread. To this end said s'pringg maybe elongated and contr'acted respectively by a take-up roller 70 and a shaft carried by this roller when the pull of the thread increasesor decreases, so

that the thread remains always tensioned. One end of the shaft z is bent under the roller h in the form of a hook to which the upper end of'spring g is attached. The locking pawl 70, 7a is pivotally mounted on a shaft Z secured to the post 6.

The described construction operates as ,When the quill c'with the thread wind ing Z) thereon has been pushed onto the spindle a, the thread is drawn over one of the two hooks mor n ofthe post 6 and-then over the hook 0 of said post 6 and the hookshaped arm of 'the pawl, whereupon it is passed around the roller h in order to be finally pulled through .the hole provided in the bent upper end of the post e. When this has been done, the threading is completed. The two hooks m and n arranged at different levels are provided for in order to prevent a lifting of the whole bobbin of the bobbin 6. l/Vhen the upwardly directed vertical component of the tension of the threadis at this time greater than the weight of the bobbin the latter will be lifted upward, which causes irregularities in the gradual delivery of the thread and con; sequently in the pattern of the braiding work. The arrangement of the hooks m and n is such, that the hook n is advantageously used when weaker threads have to be worked up and a weak spring 9 is used,'as in this case the vertical component of the thread tension referredto is less than the weight of. the bobbin. WVhen, on the contrary, strong or repeatedly twisted or plaited yarns have to be worked up, the yarn to be threaded is passed around the hook m, so that no upwardly directed vertical component of the thread-tension of any great value will be present, and consequently any lifting of the bobbin is avoided.

Whilethe braiding machine is in opera tion the arm is of the double-armed pawl 70, is is continuously drawn downward by the tension of the thread, so that the looking arm is" of this pawl is caused to engage into the locking wheel cZ provided in connection with the bobbin b. The thread is thusprevented from being drawn off. As soon as the bobbin starts to move away from the braiding point, the thread tension is increased, the. take-up roller it moves upward in; its guide-slot r, the spring 9 being thereby tensioned; In consequence of this the locking pawl is forced with continually increasing power into the locking wheel (2 until the roller 77L strikes from beneath the arm k-of the locking pawl, which arm upon a'further increase "of the tension 'of the thread is then forced upward, so'that the arm is is caused "to disengage the locking wheel. This position of the pawl L, 7c is shown in Fig, 1 in point and dashflines. At this moment the bobbin 6 is released, and in consequence'of-the tension of the thread, it is then caused to rotatefto' deliver certain aniountof thread. The take up spring 9 then immediately contracts, anditlie arm 24: of the lock ng pawl very. soon drops back into its initial 'posit1on,"the revolving bobbin being simultaneously arrested. so that only a quantity of yarn will be delivered upon a rotation of the bobbin corresponding to the pitch of the teeth of theflocking wheel d. In the meantime the whole bobbin is again approached to the braiding'point. Owing to thls, thread will be released and pulled out in consequence of a contraction of the spring 9 so that a certain tension of the thread will be constantly maintained.

The thread guard f becomes operative as soon as the thread breaks, or upon exhaust of the thread supply. The weight of this thread guard f is so small that even when operating with very weak yarns it is still lifted upward to such an extent byv the pull exerted by the spring as to engage the stops g provided on the post e. In the course of the braiding process it then remains in this uppermost position until the tension of the spring wholly ceases to act, which is the case when the thread breaks or the supply of thread becomes exhausted. The roller it together with the spring 9 and the thread guard f will then drop, the latter causing, in its lowermost position, in a well known manner,'the stoppage of the machine.

The hereinbefore described arrangement involves several advantages. The height of the bobbin is reduced compared to the mass of yarn contained thereon, the attendance on the machine is rendered very simple and the thread can be drawn out very quickly. At the same time, the arrangement of the different parts of the bobbin is such that they can all be made so strong as to be able to resist the greatest strains to which they may be subjected, a condition which should always be fulfilled in view of the detrimental forces occurring at the very high speeds at which the machines provided with bobbins of the hereinbefore described type have to run. This is especially so with regard to the members m n 0 p g which are all very strong and formed integral with the post 6. The roller it may be made of a material having a small specific weight in order to facilitate its rapid upward and downward movement.

The embodiment shown in Figs. 4 and 5 diifers in so far from that first described as the roller h is replaced by a hook 71. adapted to be displaced vertically along the post 6. The hooks m n 0 are further replaced by eyes bearing the same reference letters as the corresponding parts of Figs. 1 and 2, and the arm is of the pawl 7c is is also provided with an eye for the passage of the thread. The arm k is urged by a spring gt, fixed at one end to the post 6 and at the other end to the arm la, against the circumference of the disk cl rigidly connected to the spool cl carrying the bobbin 6 so that it is adapted to arrest said disk cZ owing to the friction that it produces on the circumference of the latter. The remainder of the construction of this bobbin and the manner of its operation correspond to that of the first embodiment, corresponding parts being designated by the same reference letters.

In the hitherto described embodiments of my invention two hooks or eyes are provided on the carrier constituted by the post e, one being arranged approximately in the middle of the coil of yarn and being destined to be used in connection With threads, while the other is provided near the lower end of the bobbin and is destined for pulling off strong yarns. In these embodiments a change in the direction of the thread occurs between the point at which the thread is drawn oif at the time from the bobbin and the hook andeye, the thread being at one time strongly inclined relatively to the axis of the bobbin and at another time perpendicular to said axis. In the inclined position of the thread the tension of the thread resolves itself into a vertical and horizontal component of which only the latter has the tendency to rotate the bobbin on its spindle a.

The design of the embodiment illustrated in Figs. 6 and 7 is improved in this respect. In this construction 1" designates a hook fixed to a flat piece 8. The latter is automatically adjustable longitudinally of the carrier 6 and two split pins t serving to keep two weights u (of which only one is shown in the drawings) in proper position, are passed through said piece 8.

The thread pulled oil the bobbin 6 passes over the hook 1 and the hook 0 fixed to the post 6, and is guided from here to the hook-like arm is of the locking pawl is, It, and then around the roller it in order to be finally guided away from the bobbin through the eye 12.

The parts 9 h 7a is act in the same manner as the corresponding parts of the first described embodiment. The hook 1" together with the fiat member 8 slides along the post 6. By putting a greater or less number of weights at on the flat piece 8 the weight of the latter can be so proportioned relatively to the spring 9 that it is kept, together with the hook r, by the thread tension, at such an elevation as to cause the thread to run off the bobbin at a right angle. The uppermost and the lowermost positions of the vertically adjustable weight, constituted by the flat piece 8 and the weights u put onto the latter, are determined by the stops 4).

Owing to the provision of a vertically adjustable weight serving to guide the thread and causing the thread to run off the bobbin always at a right angle relatively to the axis of the bobbin, the stress exerted upon the thread is reduced to the lowest amount. In consequence of said pull of the thread directed at right angles to the axis of the bobbin, the whole pull of the thread acts as a circumferential force tending to rotate the bobbin.

It will be noted that the thread detector 7 is limited in its'upward movement by the stops 9 and the take-up spring 9 is connected at its lower end to the detector, so that the roller it will not by reason of high speed only, release the locking lever 7a is.

I claim- 7 o 1. In a yarn carrier for braiding machines, a spindle on which the bobbin rotates, a post substantially parallel to said spindle, a thread guard slidable on said-post, stops for said guard, tension means and take-up mechanism on the post and connected to said guard, and a locking and releasing member for the bobbin mounted on said post and controlled by the yarn and the take-up mechanism.

2. In ayarn carrier for braiding machines, a spindle on which the bobbin rotates, a post arranged laterally of said spindle and having lateral stops, a weight slidable on said post and limited by said stops, tension and take-up mechanism on said post and normally holding said weight against said stops, and a member on said post controlled by the yarn and said mechanism for locking and releasing the bobbin.

3. In a yarn carrier for braiding machines, a spindle on which the bobbin rotates,

a post arranged laterally of said spindle and 7 means on the post for changing the tension on the thread, stops on the post, a weight slidable on the post, a take-up mechanism normally holding said weight against said stops, and a pivoted locking leverffor the bobbin held in looking position by the yarn and released therefrom by the take-up.

4. In a yarn carrier for braiding machines, a spindle on which the bobbin is rotatably mounted, a post arranged laterally of said spindle and having a thread eye and a thread at its top, and a plurality of thread guides at different elevations at its side, said post also havin a longitudinal slot, a roller D guided in said slot, a spring secured at one end to said roller and the other end fastened near thebottom of said post, a pivoted locking lever whosetail passes through the slot find is arranged to lock and release the bob- 5. In a yarn carrier for braiding machines, a spindle on which the bobbin is rotatably mounted, a post arranged laterally of said spindle and having lateral stops near its bottom and a longitudinal slot, a weight slidable on said post below said stops, a roller guided in said slot, a spring connected at one end to said roller and at the other end to said weight,a locking lever for the bobbin pivoted on said post the tail of which passes through saidslot and has a thread guide, said lever arranged to swing beyond the maximum diameter oi the-bobbin to permit the ready exchange of bobbins In testimony that I claim the foregoing as my invention, I have signed my name.

CARL WILD I.

' WVitnesses .Aimonn LEHNER, V

TEAN SOHAAD.

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