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Method and device for winding a strip consisting of a plurality of parallel threads onto a drum rotating about an axis of rotation

Method and device for winding a strip consisting of a plurality of parallel threads onto a drum rotating about an axis of rotation description/claims

The invention relates to a method and a device for winding a strip consisting of a plurality of parallel threads onto a winding body rotating about an axis of rotation. Methods and devices of this type are used, for example, in the textile industry in weaving preparation for warping the warp. However, winding processes are also required in other sectors, such as, for example, in the wire industry. The present invention, then, is not restricted to just textile applications, and the expression “threads” covers any elongate windable element, irrespective of cross-sectional shape or of material.

One requirement in modern warping methods is, for example, that the work must be carried out at high speeds, while a change in the composition of each wound strip should be ensured. This requirement arises particularly in what are known as pattern warps or short warps. However, any changeover of the strip composition, whether in generic type or the sequence of the threads or in the wound strip width, requires a machine standstill, thus considerably delaying the work process.

An object of the invention, therefore, is to provide a method and device of the type initially mentioned, by means of which rapid strip changes or different strip compositions are possible at a high production speed. This object is achieved, in terms of method, by means of a method having the features according to claim 1 and, in terms of device, by means of a device having the features in claim 15.

In conventional warping machines, the threads are brought to the correct thread density and strip width even on the reed. This arrangement clearly makes any modification of the strip difficult. These disadvantages can be eliminated if the winding position of each individual thread on the winding body is defined by means of a thread guide assigned to this thread. The thread guides therefore replace the reed, although, in contrast to the latter, they can come into any desired positions. The thread guides can therefore preferably be adjusted in the direction of the axis of rotation out of a position of rest into a working position. The thread guides can consequently be used alternately and thus change, as desired, the composition of the strip to be wound.

Particularly advantageously, a thread group consisting of a plurality of threads, preferably of different generic type, is led up to a thread selection device arranged in the winding region of the winding body, individual threads of these being drawn off as working threads via the thread guides and forming the strip, while the remaining threads are held clampingly as stock threads on the thread selection device in each case by means of a clamping point. This procedure makes it possible to carry out the strip change while the winding body is rotating continuously, thus obviously speeding up the work process considerably.

Under these circumstances, it is advantageous if, after at least one first winding sequence, the working threads of the wound strip are separated and are held clampingly on the thread selection device, and if, in at least one second winding sequence, the working threads of the strip have a composition other than that during the first winding sequence. However, the composition of the strip may also be identical on a plurality of adjacent laps. Finally, it would also be conceivable that the threads of a strip are not separated after each winding sequence, but, instead, the strip is guided directly, at the end of one lap, to the start of an adjacent lap.

A thread transfer taking place during a full rotation of the winding body can be achieved particularly advantageously when the selected working threads are first tensioned by means of the thread guides into a take-up position above the winding body, in which position they are freely tensioned, approximately parallel to the axis of rotation, between the thread guides and a clamping point in each case, and in that, in the course of a rotation of the winding body, all the working threads in the take-up position are picked up successively by an inner thread driver assigned to the winding body and are thereafter separated from the clamping point. After separation from the clamping points, the thread guides, together with their working threads, can be moved into the strip winding position to the strip width. This flying transfer of the clamped stock threads as working threads onto the winding body can take place at high speeds and within a single rotation of the winding body.

After the build-up of a strip lap, once again, all the working threads can be picked up successively by an outer thread driver corotating synchronously with the winding body and can thereafter be clamped once again by the clamping point and at the same time separated from the thread guide. In practice, therefore, a flying return of the working threads into the standby position at the clamping points takes place again.

On a cone warping machine, it is clearly necessary, for the conical winding of the strip on a warping table, that the thread selection device is displaced in the direction of the axis of rotation or at right angles to this. The warping drum in this case forms the winding body.

Clearly, within the framework of a warping process, for the correct feed of the warp onto the beam, it is necessary to introduce dividing elements into the composite thread structure. In conventional methods, as a rule, the insertion of dividing elements always requires a machine standstill. In the method according to the invention, this disadvantage can be avoided in that, at the start of a strip lap, a shed is formed with at least some of the threads at least one location on the winding body, while the winding body is rotating, and in that a dividing element is introduced into the open shed. Alternatively, however, the shed may also be formed by means of shedding combs which are arranged on an inner ring corotating synchronously with the winding body and surrounding the latter. Such thread division may preferably serve for forming a lease. Such a lease makes further processing, for example in the weaving mill, easier at a later stage. Thus, shedding, in particular leasing, and the introduction of the dividing element at full working speed also take place in a similar way to the flying take-over of the working threads onto the winding body. In specific instances, it would be conceivable to employ this type of shedding even in conventional methods in which not every individual thread is deposited via an individual thread guide.

Particularly advantageous shedding arises when, to beat up the lease, at least two shedding combs arranged on the winding body one behind the other with respect to the circumferential direction are moved out of a position of rest approximately tangential to the outer circumference into a shedding position in which the comb ends project radially away from the outer circumference, and, in the course of a rotation of the winding body, the threads are preferably deposited alternately onto comb ends and between the comb ends. The shedding combs can in this case be moved relatively simply with a part rotation into their working position. This method, however, may, of course, also be used for sizing division. Leasing is not involved here, but, instead, the threads are to be kept apart from one another. For sizing division, a plurality of shedding combs arranged on behind the other are arranged in such a way that a shed is formed in each case for only individual threads. If sizing division is additionally provided, this preferably takes place before leasing.

Clearly, shedding and the introduction of the dividing element take place before the strip winding position is assumed, the thread guides first being moved to a reading in position for depositing the threads onto the shedding combs. In this reading in position, the threads lie less closely to one another than in the later strip winding position.

Preferably, a crossing rod is first introduced into an open shed, the shedding comb which forms the respective shed thereafter being moved into the position of rest again, and, lastly, the threads divided by the crossing rod being stripped off onto a dividing element, preferably onto a dividing cord or a dividing band. The dividing cord or the dividing band is therefore not actually drawn into the shed, but, instead, the threads are transferred to the dividing cord or the dividing band.

Likewise, at the end of a strip lap, a lease for shedding can be beaten up with at least some of the threads at least one location on an outer ring rotating synchronously with the winding body and surrounding the latter, a dividing element being introduced into the open shed, and shedding preferably taking place by similar means, that is to say by means of shedding combs, to those at the start of the strip lap.

A plurality of strip laps having an identical or a different thread repeat can thus be wound onto the winding body one against the other or next to one another, the winding body rotating uninterruptedly.

In terms of the device, it is expedient if in each case a thread guide and clamping point are assigned to a thread guide module which has a mechanism for adjusting the thread guide and a movable clamping/cutting unit with a clamping point for clamping the thread and with a cutting device for separating the thread. The cutting and clamping of the threads thereby take place virtually at the same location, thus making it possible to have the flying thread change while the winding body is rotating.

The mechanism of the thread guide module is preferably a traction mechanism with a traction means, in particular with a toothed belt on which the thread guide is arranged in such a way that it can be moved over a thread guide distance approximately parallel to the axis of rotation of the winding body. The traction mechanism can be moved very quickly and accurately, for example, by means of a stepping motor. Other types of mechanism would also be conceivable, however, for example a push rod, on the end of which the thread guide is arranged.

The clamping/cutting unit can be mounted movably, approximately at right angles to the thread guide distance, in such a way that the clamping point is displaceable with respect to the winding body circumference between a radially outer position of rest and a radially inner thread transfer position. This stroke movement may be performed, for example, via a pneumatic pressure medium cylinder.

Further advantages and refinements of the invention may be gathered from the following description of an exemplary embodiment and from the drawings in which:

FIG. 1 shows a perspective overall illustration of a warping machine,

FIG. 2 shows a perspective part illustration of the warping machine according to FIG. 1 from another viewing angle,

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