Textiles: spinning – twisting – and twining – Apparatus and processes – Piecing up
Patent
1996-08-05
1998-08-18
Jillions, John M.
Textiles: spinning, twisting, and twining
Apparatus and processes
Piecing up
57279, 57353, D01H 760
Patent
active
057944261
DESCRIPTION:
BRIEF SUMMARY
This application is a national stage application, according to Chapter I of the Patent Cooperation Treaty.
TECHNICAL FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a device for practicing a method of threading in the thread during the change of a ring traveller.
Such a method is known from German Offenlegungs-schrift 4230736. In this, the cop is first rotated in reverse, in order to provide a thread reserve by the unwinding of thread from the cop. Movable combs which intermesh and between which the thread extends through lay the thread reserve in loops between the comb teeth. The old traveller seated on the ring is thereupon brought into a predetermined circumferential position on the ring, for which purpose the cop has to be rotated forwards and the thread drawn through between the comb teeth.
The thread is subsequently located on each of the two sides of the traveller by a catch hook and stretched in opposite directions on a path predetermined relative to the ring. The thread length required for this purpose is drawn additionally from the thread reserve. Before or while the new traveller is attached onto the ring, this traveller grasps the thread in the part stretched between the catch hooks. After the insertion of the new traveller, the rest of the thread reserve is wound onto the cop again.
The locating and grasping of the thread unwound from the cop involves steps which may be detrimental to the efficiency of the known method. Even when the two catch hooks find the thread in order to stretch this along the predetermined path, there is at least the problem of counteracting the risk of a thread break during stretching. The thread length required for stretching on the ring is relatively great and has temporarily had to be unwound at the expense of some considerable time. In order to avoid the thread break, stretching must take place, with the thread tension exerted by the two thread hooks being limited at the same time. A further difficulty is that thread length is required on both sides of the ring traveller, but can be additionally drawn only from one side, namely that connected directly to the reserve. The change of the traveller therefore takes up a relatively large amount of time.
SUMMARY OF THE INVENTION
The object of the invention is to provide a method which substantially simplifies the stretching of the thread for threading in and which can be carried out without appreciable delay.
Since, here, a positioning of the old traveller, the said positioning preceding the locating or grasping of the thread, is dispensed with and the thread is grasped, without a thread reserve previously having had to be formed, there is no need for preparatory steps and preparatory time. In this method, the locating of the thread is reliable and elegant in as much as it automatically assumes the catching position with the rotation of the cop. Since, on the other hand, the traveller, round which the thread is looped, is positioned as a consequence of the rotation of the cop, the said traveller can be used for stretching the thread on the threading-in zone as one of its end points. Consequently, the thread length required is reduced and it is possible to avoid drawing out thread on two sides.
The invention therefore affords a device which utilizes circumstances prevailing at the spinning station, namely, on the one hand, the known course of the thread rotation path during the rotation of the cop and, on the other hand, the old traveller positioned on the ring. On this basis, despite a simple design, the device works extremely reliably and needs little time for a complete operation to change the traveller. It is of great importance for reliability that the device itself makes do with a single member for thread engagement, thus considerably reducing the risk of thread breaks during the change of traveller.
The use of the energy storage means engaging on the thread-receiving member ensures that the tensile forces taking effect on the thread during stretching in the threading-in zone do not exceed the am
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Bracker AG
Jillions John M.
Taylor Tina R.
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