GB2204334A

GB2204334A - Device for damping spool frame pivoting

Info

Publication number: GB2204334A
Application number: GB08807085A
Authority: GB
Inventors: Frantisek Malach; Andrej Vajda; Jaroslav Talach; Jiri Marek
Original assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Current assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Priority date: 1987-03-27
Filing date: 1988-03-24
Publication date: 1988-11-09
Anticipated expiration: 2008-03-24
Also published as: GB2204334B; GB8807085D0; CS212287A1; IT8819965A0; CS263051B1; IT1217366B; DE3809421A1; CH676251A5

Description

2204,334 DEVICE FOR DAMPING SPOOL FRAME OSCILLATIONS

Description

This invention relates to a device for damping spool frame oscillations generated in the process of spool wind ing, especially on an open-end spinning machine equipped with an attendance automat adapted to travel along the spinning stations.

One of the conditions relevant to the spool winding quality consists in ensuring a fluent oscillation-free revolving motion of the spool while being wound, because such oscillations negatively affect the conditions for fibre laying up to such an extent as to render the spools would under such unfavourable conditions unsuitable for further textile processing.

To reduce the spool oscillation during the winding process, several devices intended to damp the spool frame, and consequently the spools, are known. One of them uses a hydraulic damper attached to the machine frame and to the arm of the spool frame. Another device uses a key with a keyway, the key being f ixed to a lever carried on the spool frame, and the keyway being provided for in a segment fixed to a stationary section of the winding device, eg, to the machine frame.

Still another known device uses a brake fixed to the spool frame and partly surrounding closely a flat slat fixed to a stationary section of the winding device.

Even an-other known device features a sleeve and a ball journal connecting the spool frame with a friction jaw, the latter comprising as a f ixed part of it a bolt on which is movably seated an opposite frictioal jaw, the two- frictional jaws closely surrounding a tie rod adapted to swing on a fulcrum pin fixed to the machine frame and exposed to a frictional force exerted by the said frictional jaws under the action of a pressure spring 2 The drawbacks of the above mentioned known devices consists in the fact that they can only reduce, but in principle not eliminate, the spool oscillations, because their damping effect is the same in each of the two direc tions so that only a relative limited damping force can b e set or adjusted. Their dampin.g effect is considerably unstable and fluctuating due to the wear of the friction surfaces. The hydraulic damper also involves the risk of the deterioration of the textile material in case of hydraulic liquid leakage. The above described devices are complicated, expensive, and require a skilled service and attendance.

An object of the invention is to eliminate the above drawbacks.

According to the invention there is provided a device for damping spool frame oscillations, especially on an open-end spinning machine equipped with an atten dance automat adapted to travel along the spinning stations, comprising a sleeve attached to the spool frame and adapted to carry a ball journal, on the one hand, and a tie rod fixed swingingly to the machine frame, on the other hand, wherein a guide holder is attached to the shaft of the ball journal and slidingly surrounds the tie rod, and at least one lead-in frictional jaw ad joins the tie rod and hangs on the guide holder.

The advantage of the device according to the in- vention consists in its simplicity and high damping effect on spool frame oscillations during the spool winding pro cess, because a high damping force can be set for winding, the force in the spinning direction (contact of the tube with the roll member) being many times smaller depending on the chosen angleOC of the arms and on the frictional properties of the actual frictional jaw. The device, once produced, requires no setting of values, shows long service life and simple design, places no special require- 3 ments on maintenance, and provides for increased operation reliability of winding devices. The high degree of damp ing effect increases the density of wound yarn and con sequently the productivity. The spools wound in a process supported by the damping device according to the present invention are marked by due form and hardness and are suitable for further textile processing or use.

Embodiments of the invention will now be described by way of example, with reference to the accompanying drawings,-in which:- Fig. 1 is a side elevation of a damping device and winding device; Fig. 2 shows a detail of the damping device in Fig. 1; Fig. 3 shows a detail of an alernative embodiment of the damping device in cross section; and Fig. 4 shows a detail of another alternative embodiment of the damping device in cross section.

Fig. 1 shows' yarn 2 leaving a spinning chamber and being wound on a spool 3 inserted in a spool frame 4 seated swingingly on a pivot 14. An integral part of the spool frame4 is a sleeve 5 receiving a ball journal 7 to which is attached a guide holder 8 slidingly sur rounding a tie rod 6. On a guide holder 8 is hung at least one lead-in frictional jaw 10, adjoining the tie rod 6 that is swingingly mounted on a pivot 12 fixed to the machine frame 13.

As shown in Fig. 2, the lead-in frictional jaw 10 is freely held by arms 9 and pushed away by a compression spring 11. The guide holder 8 is firmly connected with the ball journal 7 which enters the sleeve- 5 that is an integral part of the spool frame 4.

In the embodiment shown in Fig. 3 is the guide holder 8 firmly connected with the spool frame via ball journal and sleeve. The arms 9 are rotatably fixed on 4 the guide holder 8 and on the lead-in frictional jaws 10.

In the embodiment shown in Fig. 4, the guide holder 8 is also firmly connected with the spool frame via ball journal and sleeve. The arm 10, rotatably mounted on the guide holder 8, serves at the same time as a lead in frictional jaw, and is pushed away by the spring 11 leaning against a pin 15 made as a part of the guide holder 8.

The described device works as follows:

The yarn 2 leaving the spinning unit 1 is being wound on the spool 3 rotatably seated in the spool frame 4. The increasing diameter of the spool 3 being wound is accompanied by the tilting motion of the spool frame 4 on the pivot 14. The spool frame 4, is via sleeve 5 and ball journal 7, firmly connected with the guide holder 8 that is, via the rotatably mounted arms 9, connected with the lead-in frictional jaw 10. The guide holder 8 is freely traversable on the tie -rod 6 to which the lead-in frictional jaw 10 is pushed by the spring 11.

The lead-in frictional jaw 10 produces a uniform grip on the tie rod 6 on which the lead-in frictional jaw 10 moves in conjunction with the motion of the spool frame 4. During the opposite direction of the spool frame 4 motion (after the doffing, spinning-in), the guide holder 8 moves in the direction of the lead-in frictional jaw 10, thus reducing to a fraction of its preceding value the frictional force exerted on the tie rod 6 and permit ting the spool frame to reach very easily the roll-off roller.

The embodiments shown in Figs. 3 and 4 work similar- ly. The frictional properties can be set by means of due adjustment elements (not shown).

All the above described embodiments of oscillation dampers can be used also in other machines such as winding machines, twisting machines etc, but they are especially suitable for open-end spinning machines equipped with attendance automats adapted to travel along side the spin ning stations.

Claims

Claims

Z 1. A device for damping spool frame oscillations, especially on an open-end spinning machine equipped with an attendance automat adapted to travel along the spinning stations, comprising a sleeve attached to the spool frame and adapted to carry a ball journal, on the one hand, and a tie rod fixed swingingly to the machine frame, on the other hand, wherein a guide holder is attached to the shaft of the ball journal and slidingly surrounds the tie rod, and at least one lead-in frictional jaw ad joins the tie rod and hangs on the guide holder.
2. A device as claimed in claim 1, wherein a compres sion spring with adjustable preload exerts pressure on the lead-in frictional jaw.
3. A device as claimed in claim 1, wherein the lead in frictional jaw is hung on the guide holder by means of a pair of arms.
4. A device for damping spool frame oscillations, substantially as hereinbefore described with reference to Figs. 1 and 2 of the accompanying d-rawings.
5. A device as claimed in claim 4, but modified sub stantially as hereinbefore described with reference to Fig. 3 of the accompanying drawings.
6. A device as claimed in claim 4, but modified sub stantially as hereinbefore described with reference to Fig. 4 of the accompanying drawings.

Published 1988 at The Patent Office, State House, 66/71 High Holborn, London WC IR 4TP. Further copies maybe obtained from The Patent Office, Sales Branch, St Maxy Cray, Orpington, Kent BR5 3RD. Printed by Multiplex teohniciues itd, st Mary Cray, Kent. Con. 1/87.