US3104514A - Thread braking device for use in connection with ring spinning and twisting machines - Google Patents

Description

Sept. 24, 1963 c. SCHLDESSER 3,104,514

THREAD BRAKING DEVICE FOR USE IN CONNECTION WITH RING SPINNING AND TWISTING MACHINES Filed Oct. 9, 1961 l I 2 Q FIG! INVENTOR BY 1; W

United States Patent THREAD BRAKING DEVICE FOR USE IN CON- NECTIGN WITH RING SPINNDIG AND TWIST- ING MACHINES Clemens Schliiesser, Bremen, Germany, assignor to Spinnbau G.m.b.H., Bremen-Farge, Germany Filed Oct. 9, 1961, Serial No. 143,944 Claims priority, application Germany Oct. 7, 1960 7 Claims. (Cl. 5773) The present invention relates to a thread braking device for use in connection with textile machines, and, more specifically, to a thread braking device arranged at the head of the spindles of ring spinning and ring twisting machines for rotation with the spindles, while having a carrier crown for the thread by means of which a helical path of the thread from the crown to the traveler will be effected.

With heretofore known braking devices, the thread was guided by carrier or frictional surfaces in such a way that the thread formed helical windings around the spindle and the bobbin sleeve while engaging the same. In this way, a more or less ascending thread coil up to the traveler was obtained, and this process was termed balloon-free spinning or spinning with omitted balloon.

The heretofore known braking devices of this type have, in practice, proved defective for the following reasons:

First: In view of the helical looping of the thread around the spindle and the bobbin sleeve, the thread continuously slides over the upper sleeveedge and over a portion of the surface of the bobbin sleeve. For this reason, the bobbin sleeve, and in particular, the upper sleeve edge must be smooth and free from defects, otherwise a thread break is unavoidable. Therefore, in order to prevent such thread break as far as possible, the upper sleeve edge has to be provided with a smooth cover or sleeve protector, and it is necessary to handle the bobbin sleeve extremely carefully.

Second: In view of the lack of a thread balloon, the jumping or leaping of the thread spreads from one carrier of the brake to the other up to the traveler whereby the traveler likewise jumps and leaps, which, in turn, again may cause thread breaks in view of the fact that the tension compensating efiect of the thread balloon is lacking.

Third: When underwinding the toll bobbin sleeve, great difficulties are encountered because the helical thread loop has frequently to engage the yarn body, which brings about frequent thread breaks.

It is also known to arrange an additional traveler above the spindle and to provide the spindle with an extension comprising two sections of which only the upper one will be looped around by a thread. While with this arrangement the spindle itself is not looped around by the .thread, the construction of this arrangement is already in view of the additional traveler, relatively complicated and expensive.

'It is, therefore, an object of the present invention to provide a thread braking arrangement which will overcome the above-mentioned drawbacks.

It is another object of this invention to provide an improved thread braking arrangement in which the thread coil or helix will be limited to the inserted shank.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawing, in which:

FIGURE 1 diagrammatically illustrates a side view of a spindle with a thread braking arrangement according to the invention placed thereon.

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FIGURE 2 represents a modified thread braking arrangement according to the present invention.

FIGURE 3 is a section through still another modification of the invention.

The thread braking arrangement according to the present invention is characterized primarily in that the carrier of the braking arrangement is mounted on a shank inserted into the spindle. The diameter of said shank is preferably less than onethird of said spindle, so that in view of the step between the shank and the spindle protruding from the bobbin sleeve, the thread will helically loop around said shank only.-

Referring now to the drawing in detail, and FIG. 1 thereof in particular, the arrangement illustrated in FIG. 1 is such that the thread 1 passes in customary manner from the pair of delivery rollers 2. through the pig-tail 3 to the carrier crown or thread guiding means 4 of the thread braking device which is mounted on a shank 5 inserted into the spindle 6 so as to rotate therewith. To this end, the member 4 may, 'for instance, consist of one piece with the shank 5, or may be press fitted thereon, or may in any other suitable way be connected to shank 5. Shank 5 has a diameter which is less than one-third of the spindle diameter, so that between shank 5 and spindle 6 a considerable step 6a is obtained over which the thread -1 has to slide after being looped around the shank 5. Therefore, the thread 1 will, from said step 6a to the traveler 7, form a balloon and will then at 8a be wound upon the bobbin sleeve 8.

The diameter of the carrier crown or thread guiding means 4 is from 2 to 5 times greater than the diameter of the shank, so that the diameters of the carrier crown, of the shank and of the spindle, or, if the braking device is provided with a special foot, also the diameter of such foot, will be within the limits of the ratios of from 2: l :3 to 5:1:10.

The carrier crown or thread guiding means 4 with the thin shank 5 is detachable from spindle6, and if desired, the carrier crown may also itself be detachable from shank 5.

It is advantageous to so design the shank 5 that it tapers toward the spindle so that thread loops which might have formed, for instance, in the balloon during a thread brake, can easily be stripped off when pulling out the shank. With thread brakes which bring about a looping of the thread around the spindle or an upper member firmly connected to the spindle, it is, in such instances, rather cumbersome to wind off the thread, or such undesired thread loops have to be eliminated by means of a sharp tool.

It is by no means imperative that the considerable step between shank and spindle diameter is at a right angle to the spindle axis. It is rather possible, as shown in FIG. 2, to shape the step between shank 5 and spindle 9 in form of a cone 9a.

FIG. 2 also shows more clearly the design of the carrier crown 4. As will be seen in particular from FIG. 2, the carrier crown has grooves 4a which are substantially parallel to the axis of shank 5, as is particularly clearly illustrated in the section through the crown of FIG. 3. The step from the carrier crown to the shank may likewise be formed by a conical surface of said crown, while the top side may be plane.

The taper at the portions where the surface of crown 4 merges with the surface of shank 5 and/ or where the surface of shank 5 merges with the surface of spindle 9 amounts to at least Instead of inserting the shank with the crown directly into the head of the spindle, it is also possible to provide the foot portion of the braking device with a cap to be placed upon the spindle head. Such an arrangement is shown, for instance, in FIG. 3. As will be seen from FIG. 3, the foot or bottom portion of the braking device is provided with a cap 13 which is pressed upon the head or upper portion of spindle 10. The outer diameter of this cap 13 is somewhat less than the smallest inner diameter of the bobbin sleeve 14. Thus, according to the arrangement of FIG. 3, the upper portion of spindle It) does not contact the bobbin sleeve 14.

As will furthermore be evident from FIG. 3, a ring 1?. of an elastic material, as, for instance rubber, is inserted between cap 13 and the head of spindle 10. This ring serves as friction coupling between'the spindle it) and cap 13 on one hand, and shank 5 on the other hand. To this end, the inner diameter of ring 12 is slightly less than the outer diameter or; shank 5.

In connection with all embodiments of the invention, it isimportant that the step 6a, ha is located above the upper bobbin sleeve edge to a suflicient extent. With the ierctofore known spindles, the spindle head is usually located a few millimeters or centimeters below the upper bobbin sleeve edge. As will be seen from FIG. 1, with the arrangement of the invention, the upper edge of the bob-bin sleeve 3 is located considerably below the step 6a so that thread 1 cannot be 'afiected by th upper edge of the bob-bin sleeve. The same remarks also apply to the embodiment of H6. 3. According to the embodiment of FIG. 3, the upper edge of the bobbin sleeve is located approximately at the central portion of cap 13.

With the heretofore known thread braking arrangements, no stable guiding of the thread is obtained be tween the braking device and the traveller, because a fluctuation occurs between the fully formed balloon and the fully formed helix or thread loop, which fact is harmful to the entire spinning process. In contrast thereto, as will be obvious from the above, with the braking arrangement according to the present invention, the thread loop will be permanently limited to the inserted shank 5.

It is, of course, to be understood, that the present invention is, by no means, limited to the particular con struction shown in the drawing, but also comprises any modification within the scope of the appended claims.

What I claim is:

1. In a thread braking device for ring spinning and ring twisting machines, a rotatable spindle adapted to receive and rotate a bobbin sleeve, a shank inserted into the upper end portion of said spindle for rotation therewith, and means connected to said shank in spaced relationship to the upper end portion of said spindle for receiving a thread and passing the same around said shank and over the upper edge of said spindle, said shank having a diameter less than a third of the diameter of the adjacent spindle end, whereby said shank forms a considerable step with said adjacent spindle end.

2. A thread braking device according to claim 1, in which that diameter portion of said shank which is ad jacent said upper spindle end portion is approximately one-third of the diameter of said adjacent spindle end portion.

3. In a thread braking device, for ring spinning and ring twisting machines, a rotatable spindle adapted to receive and rotate a bobbin sleeve, a shank inserted into a 4 the upper end portion of said spindle for rotation therewith, and notched crown shaped means connected to said shank for rotation therewith and arranged in spaced relationship to the upper end portion of said shank for receiving a thread and passing the same around said shank and over the upper edge of said spindle, said shank having a diameter less than one third hr the diameter of the adjacent spindle end, whereby said shank forms a considerable step with said adjacent spindle end, and said notched crown shaped means having a diameter at least twice the diameter of the adjacent shank portion.

4-. A thread breaking device according to claim 1, in which said shank tapers toward the adjacent end of said spindle,

5. In a thread braking device for ring spinning and ring twisting machines, a rotatable spindle adapted to receive and rotate a bobbin sleeve, a shank inserted into the upper end portion of said spindle for rotation therewith, the upper portion of said spindle including cap means surrounding a portion of said shank and being ring twisting machines, a rotatable spindle adapted to receive and rotate a bobbin sleeve, a shank inserted into the upper end portion of said spindle for rotation therewith, the upper portion of said spindle including inverted cup shaped cap means with a bottom and a skirt connected thereto, said bottom surrounding a first shank portion in spaced relationship to the lower end portionof said shank, and said skirt surrounding the lower end portion of said shank, coupling means adjacent the bottom of said cap means and frictionally engaging the same and said shank, and crown shaped means arranged above said cap means in axially spaced relationship thereto and connected to said shank for rotation therewith to receive a thread and passing the same around the shank portion between said cap means and said crown shaped means and over the upper edge of said bot-tom of said cap means.

7. A device according to claim 6, in which said coupling means consist of a ring of an elastic material having an inner diameter less than the outer diameter of the shank portion surrounded thereby.

References Cited in the file of this patent UNITED STATES PATENTS 2,041,918 Freund May 26, 1936 2,217,371 Kowarick Oct. 8, 1940 2,622,388 Roeder Dec. 23, 1952 FOREIGN PATENTS 531,070 Italy July 21, 1955

Claims (1)

1. IN A THREAD BRAKING DEVICE FOR RING SPINNING AND RING TWISTING MACHINES, A ROTATABLE SPINDLE ADAPTED TO RECEIVE AND ROTATE A BOBBIN SLEEVE, A SHANK INSERTED INTO THE UPPER END PORTION OF SAID SPINDLE FOR ROTATION THEREWITH, AND MEANS CONNECTED TO SAID SHANK IN SPACED RELATIONSHIP TO THE UPPER END PORTION OF SAID SPINDLE FOR RECEIVING A THREAD AND PASSING THE SAME AROUND SAID SHANK AND OVER THE UPPER EDGE OF SAID SPINDLE, SAID SHANK HAVING A DIAMETER LESS THAN A THIRD OF THE DIAMETER OF THE ADJACENT SPINDLE END, WHEREBY SAID SHANK FORMS A CONSIDERABLE STEP WITH SAID ADJACENT SPINDLE END.

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