GB1601487A - Thread traversing device for thread winders - Google Patents

Description

(54) THREAD TRAVERSING DEVICE FOR THREAD WINDERS (71) I, MANFRED THOMA, a German citizen of Winkelmahdstrasse 5, D--8901 Leitershofen, Western Germany, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a thread traversing device for the winding of threads, such as are provided on winding machines, spinning draw-frames, crimping winding machines, draw-winding machines and the like machines for winding.

Winding devices of this kind comprise thread traversing means which take the threads to be wound to and fro transversely to the direction in which they are fed.

The term 'threads' covers in a wider sense threads, yarns, twisted yarns, small tapes, a wires including, for example, filament yarn threads or fibre threads.

According to a known winding device, the thread tranversing means comprises for each thread a slotted drum, where the thread is guided to and fro in an endless slot, which is arranged on the circumference of the drum. The thread passes through the slotted drum substantially diametrically and is consequently subjected to bending and friction, both as it enters and leaves the slotted drum, which inevitably leads to unfavourable stress conditions for the guided thread. Due to this bending and friction along the walls of the slotted drum, a fibre separation is inevitable. For this reason, such slotted drums can be used only at a limited thread speed, particularly if sensitive threads or threads which are easily damaged are involved.

Furthermore, the disadvantage of this slotted drum is that in the event of a thread breakage, which mostly occurs in the slotted drum, the broken thread is wound onto the drum, from where it is difficult to remove.

The known flyer thread guide, formed in wire, is also only cable of improving the above-mentioned shortcomings to a limited extent.

So-called eccentrics are frequently used in conjunction with the appropriate thread guides for guiding the threads or the like material to be wound to and fro. On these known guiding devices a so-called guiding block is carried- in an appropriately shaped cam in the eccentric and the reciprocating movement is transmitted through a connecting linkage to the actual thread guide forward of the bobbin.

In spite of optimum bearing and lubricating devices being provided, such known eccentric thread guides are limited with respect to the number of strokes per unit of time provided, since the driven parts have to follow a rapidly changing acceleration and stoppage along with a simultaneous change in direction.

It is also known to guide the thread obliquely over one or two rotating heartshaped discs, so as to take the thread to and fro across the bobbin width while it rests against the outer disc edge. However, since the thread only rests against the disc edge due to its inherent tension, there is a risk that the thread will jump over the tip of the disc and will be placed against the bobbin, causing so-called throw-overs to be formed.

According to a device which has furthermore become known, the thread is guided to' and fro by small belts, corresponding follower pins or protruberances guiding the thread. The difficulty of such small belt guiding devices resides in the driving and particularly the transfer of the thread from one small belt to another, which difficulty arises particularly at higher traverse motion speeds.

An object of the invention is to provide a device for traversing threads that are to be wound at any desired speed and in any material provided.

According to the invention a thread traversing device for winding equipment for threads is characterised by the provision of an endless external belt guided as to be flat, said belt engaging and driving by a part at least of its internal surface at least one internally located endless belt the or each of which is provided with a thread passage eye.

Conveniently the external belt drives the internal belt frictionally. For the actual thread guidance, an appropriate thread guide eye is provided in the internal belt. In order to bring about a constant drive of the internal belt, this latter may, for example, be toothed on its surface according to the invention, thus allowing it to engage with corresponding internal teeth of the external belt.

According to a development of the invention, the internal belt may comprise on its outside, for a reliable lateral guidance, a curved surface which engages in an internally curved or conical inner tooth surface of the external belt.

The drive of the external belt may be effected in known 'per se' manner by simple belt guiding and driving pulleys. For a narrow belt guidance, the external belt may be guided, according to the invention, along the running surface of the internal belt by appropriate so-called narrowing rollers.

For an effective limitation of the internal belt, which in principle runs freely, a development of the invention also provides for so-called limiting rollers to be placed on the outside to the right and left of the internal belt.

According to a further development of the invention, one, two or several of such internal belts may be inserted within an external belt drive, so as to provide the traverse motion guidance of several singlethreaded bobbins with the aid of one belt drive.

According to a still further development of the invention, instead of the profiled external and internal belts, it is possible to use other ropes, for example such which are round or square in cross section, as well as bands.

The traverse motion guiding device according to the invention is capable of bringing about the thread transfer at a very high speed, i.e. the thread to be wound on the bobbin can be fed and wound at high speed. The guiding device according to the invention runs with very little noise, this being a special advantage over eccentric thread guides.

A change in the length to be wound can be effected in a simple manner on the guiding device according to the invention by the exchange of the so-called internal belt. The circumference of the flat running internal belt is responsible for the length to be wound.

The guiding device according to the invention will be described in detail with reference to Figures 1 to 3 of the accompanying drawings. In Figure 1, an external endless belt (1) is guided and driven by the driving pulleys (2a and 2b). The internal belt (3) is inserted between the driving pulleys (2a and 2b). For reliable driving and guidance, the external belt (1) is appropriately profiled, for example toothed, on its inside so that the internal belt (3), which is also toothed on its outside, engages therein. For the reliable lateral guidance of the internal belt (3), the external belt (1) may be inwardly curved or conically formed on its inside, while the internal belt (3) is correspondingly curved or conically formed on its outside. It is of special advantage if the tooth design is angular, as shown in Figure 2, so that the interengagement of the cooperating teeth serves positively to laterally guide the internal belts.

For as flat a guidance of the internal belt (3) as possible and the rapid thread reversal at the outer ends thus made possible, narrowing rollers (5) may guide the external belt (1).

The reliable guidance of the internal belt (3) may be ensured by the limiting rollers (4a and 4b).

The actual thread guide eye (6) is provided in the internal belt (3) and is firmly connected thereto.

Figure 3 shows the insertion of several internal belts (3)-(3a+3b+3c).

WHAT I CLAIM IS: 1. A thread traversing device for winding equipment for threads characterised by the provision of an endless external belt guided as to be flat, said belt engaging and driving by a part at least of its internal surface at least one internally located endless belt the or each of which is provided with a thread passage eye.

2. A thread traversing device as claimed in claim 1, characterised in that the external belt and the internal belt are toothed at their contact surfaces and in that the toothing is convex and concave in design so that the external belt and the internal belt intermesh.

3. A thread traversing device as claimed in claim 1, characterised in that there are provided narrowing rollers for a narrow belt guidance of the external belt and limiting rollers for the guidance of the internal belt.

4. A thread traversing device as claimed in any of claims 1 to 3, characterised in that one, two or several internal belts are mounted within one external belt drive.

5. A thread traversing device as claimed in any one of claims 1 to 4, characterised in that the external belt and/or the internal

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. said belt engaging and driving by a part at least of its internal surface at least one internally located endless belt the or each of which is provided with a thread passage eye. Conveniently the external belt drives the internal belt frictionally. For the actual thread guidance, an appropriate thread guide eye is provided in the internal belt. In order to bring about a constant drive of the internal belt, this latter may, for example, be toothed on its surface according to the invention, thus allowing it to engage with corresponding internal teeth of the external belt. According to a development of the invention, the internal belt may comprise on its outside, for a reliable lateral guidance, a curved surface which engages in an internally curved or conical inner tooth surface of the external belt. The drive of the external belt may be effected in known 'per se' manner by simple belt guiding and driving pulleys. For a narrow belt guidance, the external belt may be guided, according to the invention, along the running surface of the internal belt by appropriate so-called narrowing rollers. For an effective limitation of the internal belt, which in principle runs freely, a development of the invention also provides for so-called limiting rollers to be placed on the outside to the right and left of the internal belt. According to a further development of the invention, one, two or several of such internal belts may be inserted within an external belt drive, so as to provide the traverse motion guidance of several singlethreaded bobbins with the aid of one belt drive. According to a still further development of the invention, instead of the profiled external and internal belts, it is possible to use other ropes, for example such which are round or square in cross section, as well as bands. The traverse motion guiding device according to the invention is capable of bringing about the thread transfer at a very high speed, i.e. the thread to be wound on the bobbin can be fed and wound at high speed. The guiding device according to the invention runs with very little noise, this being a special advantage over eccentric thread guides. A change in the length to be wound can be effected in a simple manner on the guiding device according to the invention by the exchange of the so-called internal belt. The circumference of the flat running internal belt is responsible for the length to be wound. The guiding device according to the invention will be described in detail with reference to Figures 1 to 3 of the accompanying drawings. In Figure 1, an external endless belt (1) is guided and driven by the driving pulleys (2a and 2b). The internal belt (3) is inserted between the driving pulleys (2a and 2b). For reliable driving and guidance, the external belt (1) is appropriately profiled, for example toothed, on its inside so that the internal belt (3), which is also toothed on its outside, engages therein. For the reliable lateral guidance of the internal belt (3), the external belt (1) may be inwardly curved or conically formed on its inside, while the internal belt (3) is correspondingly curved or conically formed on its outside. It is of special advantage if the tooth design is angular, as shown in Figure 2, so that the interengagement of the cooperating teeth serves positively to laterally guide the internal belts. For as flat a guidance of the internal belt (3) as possible and the rapid thread reversal at the outer ends thus made possible, narrowing rollers (5) may guide the external belt (1). The reliable guidance of the internal belt (3) may be ensured by the limiting rollers (4a and 4b). The actual thread guide eye (6) is provided in the internal belt (3) and is firmly connected thereto. Figure 3 shows the insertion of several internal belts (3)-(3a+3b+3c). WHAT I CLAIM IS:

1. A thread traversing device for winding equipment for threads characterised by the provision of an endless external belt guided as to be flat, said belt engaging and driving by a part at least of its internal surface at least one internally located endless belt the or each of which is provided with a thread passage eye.

2. A thread traversing device as claimed in claim 1, characterised in that the external belt and the internal belt are toothed at their contact surfaces and in that the toothing is convex and concave in design so that the external belt and the internal belt intermesh.

3. A thread traversing device as claimed in claim 1, characterised in that there are provided narrowing rollers for a narrow belt guidance of the external belt and limiting rollers for the guidance of the internal belt.

4. A thread traversing device as claimed in any of claims 1 to 3, characterised in that one, two or several internal belts are mounted within one external belt drive.

5. A thread traversing device as claimed in any one of claims 1 to 4, characterised in that the external belt and/or the internal

belt or belts are round or square in cross section and are formed as ropes or bands.

6. A thread traversing device substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.