WO1999037566A1

WO1999037566A1 - Yarn supply system

Info

Publication number: WO1999037566A1
Application number: PCT/EP1999/000507
Authority: WO
Inventors: Michele Melillo
Original assignee: Iro Patent Ag
Priority date: 1998-01-26
Filing date: 1999-01-26
Publication date: 1999-07-29
Also published as: CN1289305A; EP1053196A1; DE59902337D1; SE9800226D0; CN1092125C; EP1053196B1

Abstract

The invention relates to a yarn supply system (L), especially for a shuttle loom, having at least one yarn supply device (F) comprising a storage element (7) and a wind-up element (6) as well as a rotating drive (5) for generating a relative rotational movement between the storage element and wind-up element so as to form a yarn supply (S) on the storage element which supply consists of coils. When the yarn (Y) is to be used it can be unwound from the storage element overend. The system also comprises yarn control and monitoring devices (B, 19, 20) arranged on the yarn supply device and a nozzle device (D) which is integrated into the yarn supply device, has at least one air outlet (22, 24, 24') for a directed air jet (J) and is connected to a compressed air supply (B). The air outlet (22, 24, 24') is directed towards the unwinding area (A) of the yarn supply device (F) and an interrupter device (CD) is provided for upstream of the air outlet for intermittently activating individual air jet blasts.

Description

Thread delivery system

The invention relates to a thread delivery system according to the preamble of claim 1.

When processing most thread qualities in such a thread delivery system, there is usually a strong fluff. The fluff has the unpleasant property of being deposited on the smallest protrusions, in flow dead zones, angles and internal cavities that are hardly accessible from the outside, despite the air currents due to the working of the delivery device and the movement of the thread, and to form permanently growing tufts of fluff and fluff coverings. This is inevitable especially in the draw-off area of the thread delivery device, where there are balloon limitation, braking or monitoring devices for thread control. The lint deposits grow until they can no longer hold due to their own weight or are detached by the thread movement. Detached parts of such deposits or large tufts of lint often adhere to the thread and are inserted into the thread with it, which leads to tissue defects.

In a yarn delivery system known from EP-B-0 170 027 with at least one yarn delivery device, a nozzle device is integrated into the yarn delivery device which shields the detection area of an optical detector with air jets. Since it is required that no dust settles on the storage body between the detector and the thread supply where it is to be detected and / or any dust flakes have to be guided away from this detection area, permanently acting air jets are necessary. This means that each blow-out opening is permanently supplied with compressed air as long as the thread delivery device is in operation. The permanent operation of the nozzle device guarantees the functionality of the detection device, but is not suitable for preventing tissue disturbances caused by tufts of fluff or dust flakes, because despite the continuous pressurization of compressed air in the detection area, there are suitable protrusions, angles and cavities in the withdrawal area of the thread delivery device in order to get there to deposit. Parts of such deposits, if they have grown enough, can be detached from the thread and / or due to their inherent weight and carried with the thread and into the Tissues are entered. The uniform air flow, which shields the detection area, is rather disadvantageous in the fume cupboard area, because a uniform flow pattern promotes and compresses fluff in angles, cavities or against projections. In the case of the nozzle device, which is permanently supplied with compressed air, the compressed air requirement and thus the energy expenditure are extremely high.

The invention has for its object to provide a thread delivery system of the type mentioned, in which tissue errors are avoided by registered fluff tufts with little energy.

The object is achieved with the features of claim 1.

The discharge openings of the nozzle device, which are structurally incorporated in the thread delivery device, detach lint deposits far more effectively than continuous air jets, because the kinetic energy of an abrupt jet pulse generates a shock or abrupt explosion effect for the deposit. The intermittent jet pulses are initiated by means of the interrupter device, the compressed air is allowed to reach the blow-out openings only over a predetermined period of time, and rest periods between the intermittent jet pulses in which little or no compressed air flows. Individual short or longer burst-like beam pulses can be generated, or a pulse sequence consisting of very short, pulsating beam pulses with a subsequent longer break. Lint and dust deposits are broken up and removed before they reach a critical level and are detached from the thread and taken away. This reliably prevents tissue defects due to the accumulation of lint or dust. This is based on the knowledge that jerky jet pulses, between which breaks rest, achieve a much more intensive blasting effect than continuous air flows, but at the same time keep air consumption low. The detached deposits can also be removed very effectively from the draw-off area of the thread delivery device by means of jerky jet pulses, without being moved along with the thread. It can be advantageous to generate at least one jerky jet pulse when the thread is just motionless, to bring the jerky jet pulse (s) into effect when the yarn delivery device is running. Each jet pulse leads to individual and strong turbulence in the area of impact, which does not allow a regular or even flow pattern to arise, which would entail the danger of adapting to this flow pattern to form deposits. With a correspondingly frequent impact of abrupt jet impulses, the deposition of fluff and dust in the area of the thread delivery device which is critical with regard to the occurrence of such tissue defects can also be completely avoided. With the interrupter device controlling the nozzle device, fabric defects due to tufts of fluff or flakes of dust are avoided in a surprisingly simple manner.

It is essential that the interrupter device generates jerky jet pulses and these pulses are brought into effect in the critical draw-off area of the thread delivery device in order to blow up deposits of still harmless size or even to prevent the formation of dangerous deposits. How the shock-like jet pulses are generated by the interrupter device with the nozzle device depends on the operating conditions of the thread delivery system. This means that at regular or irregular time intervals, which depend on the lint and dust accumulation of each delivery device, a jerky jet pulse with a predeterminable duration is brought into effect, or a sequence of such jerky jet pulses is generated at predetermined time intervals, i.e. a pulsating one Cleaning sequence is controlled. The interrupter device can be operated manually, for example in the course of routine cleaning cycles by the weaver, or remotely controlled and automatically, possibly by a monitoring center in a weaving mill, or fully automatically by an assigned control device, possibly even the control of the respective thread delivery device or a central control of a thread delivery system with several thread delivery devices on one weaving machine or one weaving machine group. The time intervals between such cleaning cycles can be the delivery device to be different, depending on the amount of fluff and dust. It is also possible to set a common clock frequency for all yarn delivery devices of a yarn delivery system or all yarn delivery systems controlled via the interrupter device, which is just sufficient for the most vulnerable yarn delivery device or yarn delivery system to avoid such fabric defects and to clean the other yarn delivery devices or yarn delivery systems more than necessary . It may be advisable to use a rest phase of the thread delivery device for a cleaning or cleaning sequence, or, in contrast, an operating phase of the thread delivery device at high or maximum speed in order to assist the dynamics when the thread delivery device is working in order to effectively remove torn deposits from the thread delivery device.

According to claim 2, the interrupter device makes it possible to shut off the compressed air supply in each rest period between cleaning cycles. As a result, and since only little air is consumed with each burst-like jet pulse, the overall air consumption is low. The shut-off position is expediently self-retaining, so that no compressed air is wasted even when the thread delivery system or thread delivery device is switched off.

According to claim 3, a cleaning cycle with at least one burst-like jet pulse or a sequence of jet pulses can be controlled by means of a manual intervention.

As an alternative or in addition, cleaning cycles can be controlled, expediently automatically, via the time switch or control device.

According to claim 5, the thread delivery system can be adapted precisely to the respective working conditions, for example to the amount of fluff or to the positioning of the thread delivery device. The latter is important because experience has shown that in the case of a thread delivery device of a thread delivery device group, the lower ones are also exposed to an increased amount of fluff from the upper thread delivery devices. The setting of the intermediate pauses and the duration of the jet pulses is expediently inquired with regard to optimally low compressed air consumption with a reliably sufficient cleaning effect or with a view to avoiding tissue defects.

According to claim 6, the interrupter device is clocked by the control device of the thread delivery device, which as a rule contains a powerful microprocessor, the capacity of which is also sufficient for the program routine relating to the cleaning cycles.

According to claim 7, all of the components required to avoid such fabric defects are integrated in the thread delivery device, which, expediently fully automatically, ensures the removal or detachment of dangerous deposits and only needs to be connected to the compressed air supply.

According to claim 8, the compressed air supply, which is anyway required for the pneumatic threading device, is also particularly useful for the cleaning function, possibly even with at least partial use of the flow paths provided in the thread delivery device for the threading device. However, the nozzle device or interrupter device should be passivated automatically if the threading device works.

According to claim 9, a plurality of yarn delivery devices of a yarn delivery system or even a plurality of yarn delivery systems are controlled centrally via a common interrupter device in order to avoid fabric defects in the connected yarn delivery devices. In a weaving mill, all of the thread delivery systems provided on the weaving machines could, for example, be controlled centrally from a monitoring station with regard to cleaning.

According to claim 10, the inlet side of the thread brake, which is particularly critical with regard to lint deposits, is subjected to shock-like jet pulses. According to claim 11, the blow-out openings are arranged on the support ring of the brake element of the thread brake, so that they act on the inlet side and / or the outlet side with shock-like jet pulses, either simultaneously or with mutual phase displacement, in order to be able to use as much energy as possible for each jet pulse. Due to the ring shape of the braking element, ring lines with blow-out openings are available, which are supplied with compressed air blasts via the interrupter device.

According to claim 12, the blow-out openings are provided on a holding fork of the braking element. The holding fork for guiding the air is expediently hollow. The two aforementioned embodiments offer the advantage of unimpeded replacement of the brake element forming a wearing part without impairing the cleaning effect.

According to claim 13, the area of the thread take-off eyelet, which is critical with regard to deposits, is also cleaned or kept clean, either simultaneously with the further take-off area of the thread delivery device or with a phase shift, in order to be able to generate particularly powerful shock-like jet pulses.

The blow-out openings with which the shock-like jet pulses are generated can be arranged in series along a common connecting line, or can also be connected individually or in groups to separate connection lines in order to be able to generate strong shock-like jet pulses at each blow-out opening or blow-out opening group. A compressed air reservoir can be connected upstream of the interrupter device in order to generate the shock-like beam pulses with sufficient strength.

Embodiments of the subject matter of the invention are explained with the aid of the drawings. Show it:

1: schematically in a side view a thread delivery device, 2: a schematic side view of another embodiment of a thread delivery device,

3: a detail from FIG. 1, in cross section,

4: an embodiment variant in the form of a block diagram,

Fig. 5: schematically a yarn delivery system with several yarn delivery devices, and

Fig. 6: exploded views of several components of a thread delivery device.

A thread delivery device F in FIG. 1, in particular for a weaving machine, has a housing 1 with a boom 2 and a holding part 3 for a draw-off eye 4. A drive motor 5 for a winding element 6 is arranged in the housing 1 and forms a thread Y drawn off from a supply spool (not shown) in individual turns in the form of a thread supply S on a drum-shaped storage body 7 arranged on the housing 1. From the thread supply S, the thread Y is entered as a weft thread in the weaving machine, not shown, and is overhead of the storage body 7 by a thread control device, e.g. a thread brake B, deducted. The thread brake sits on a carriage 8 in the boom 2 and has a retaining ring 9 in which a brake element 11 is secured in position with its annular carrier 10. The braking element 11 can be a brush ring (shown) or a disk ring or an elastic ring membrane with an internal continuous brake lining (not shown). The braking element 11 contacts the storage body 7, the nose area of which is indicated by 12.

The thread delivery device F is equipped with a nozzle device D integrated into the thread delivery device. In the exemplary embodiment shown, a ring line 21 is mounted as a component of the nozzle device D, for example on the support ring 9 and is connected via a line 14 to an interrupter device CD, to which one 8th

Compressed air supply T is connected. Another line 13 (branch line) leads through the extension arm 2 and the holding part 3 to the area of the trigger eye 4. There are blow-out openings 22, e.g. Nozzles are provided, which are connected to the line 13 and form a further component of the nozzle device D.

The interrupter device CD can have a control device, timer or clock device, not shown, and optionally a manual control 15. The interrupter device can be moved back and forth between a shut-off position and a through position, shuts off the compressed air supply P in the shut-off position, and connects in the through position the compressed air supply P with the blow-out openings.

In the ring line 21 (FIG. 3) are distributed in the circumferential direction, a plurality of blow-out openings 24 are provided which aim at the inlet side of the brake element 11. By actuating the interrupter device, jerky jet pulses (jets J in FIG. 3) can be generated, which detonate and remove lint and dust deposits in the draw-off area A of the thread delivery device. The interrupter device CD can - as shown - be connected to a control device CF of the thread delivery device F, or its drive motor 5.

In Fig. 1, the thread delivery device F has an integrated pneumatic thread threading device T, for example consisting of a first nozzle 16, flow guide surfaces not shown, and a pneumatic adjusting device 17 (arrow), for example, with which the thread brake B moves from the operating position shown into one Gap position can be adjusted to the right so that the thread after it emerges from the winding element 6 along the storage body 7, can be threaded through the thread brake B and finally through the draw-off eye 4. The individual components of the threading device T can be connected to the same compressed air supply P as the interrupter device CD. However, it is also possible to provide a separate compressed air supply for the thread threading device T. In the case of a joint supply of compressed air, it is advisable to use a To provide changeover device, not shown, with which the interrupting device CD is passivated when the threading device is activated. The threading device T may also include a suction nozzle provided in the area of the draw-off eye 4.

The sectional view of Fig. 3 illustrates that the ring line 21 is attached to the cross-section, for example L-shaped support ring 9 of the thread brake B, the outlet openings 24, e.g. Nozzles, aim at the inlet side of the braking element 11 and, when the interrupter device CD is moved into the open position, exert jerky jet pulses on the inlet side of the braking element 11. The carrier 10 of the thread brake element 11 is secured (replaceable wear part) with a locking ring 23 in the support ring 9. Optionally, as a further component of the nozzle device, a ring line 21 'is attached to the support ring 9 on the outlet side of the thread brake element and has blow-out openings 24' which aim at the outlet side of the thread brake element 11 and / or at the nose area 12 of the storage body 7.

The thread delivery device F according to FIG. 2 is intended for supplying the weft thread to an air jet weaving machine (not shown) and therefore has a stop device 19 on the housing 1 with an extendable and retractable stop element 20 which cooperates with the storage body 7 by a predetermined amount in each case Release thread length for take-off. The diameter of the storage body 7 can be changed to adjust the respective thread length. In the draw-off area of the thread delivery device and the blind spot below the stop device 19, blow-out openings 24 ", for example nozzles, of the nozzle device D integrated into the thread delivery device are directed, which are connected via line 13 to the interrupter device CD, to which the compressed air supply P is connected. Here, too, the interrupter device CD could be linked to the control device CF of the drive motor 5 of the thread delivery device F. 10

In Fig. 4 it is indicated that the interrupter device CD, for example, a valve

25 can be arranged between the compressed air supply P and the line 13 to the blow-out opening 24 and is biased by a spring in the direction of its shut-off position. A pressure accumulator 28 could be connected upstream of the valve 25. To move the valve 25 into the open position, an actuator 26, e.g. a switching magnet may be provided, and / or a manual operation 15. The switching magnet

26 could be controlled via a control device, timer circuit or a clock generator 27, which controls a specific clock sequence R with pauses between the burst-like beam pulses, possibly automatically and according to an adjustable programming.

FIG. 5 illustrates a thread delivery system L consisting of several thread delivery devices F, which are assigned to a weaving machine, not shown. A common interrupter device CD is provided for the yarn delivery system L, which acts on the nozzle devices D in the yarn delivery devices at the same time or according to a preselected sequence with phase shifting, in order to generate shock-like beam pulses in each case. A common interrupter device CD could even be provided for several yarn delivery systems L.

In Fig. 6 the boom 2 of the housing 1, for example the thread delivery device of Fig. 1, is shown in perspective. At its rear end, for example, the manual control 15 for the interrupter device CD is arranged. The control device CF of the thread delivery device can also be accommodated in the arm 2. The line 13 is, for example, a flexible hose line inside the boom 2, which is connected via a plug-in coupling to a holding fork 9 'of the brake element 11, not shown. The holding fork 9 'can be hollow and contains a plurality of blow-out openings 24 with which shock-like jet pulses (jets J) can be generated on the outlet side of the braking element. The brake element 11 is detachably fixed in a kind of cardanic support on projections 9 "of the holding fork 9 '. The holding fork 9' is rotatably mounted analogously to FIG. 1 on a carriage 8 and which engages in an end part 2a of the arm 2. The holding part 3, the trigger eye 4 11

contains, distributed around the trigger eyelet 4 on several blow-out openings 22 which are connected to the line 13.

Claims

12 Patent claims

1. Thread delivery system (L), in particular for a weaving machine, with at least one thread delivery device (F) which has a storage body (7) and a winding element (6) and a rotary drive (5) for a relative rotary movement between the storage body and the winding element for forming has a thread supply (S) consisting of turns on the storage body, the thread (Y) being removable for consumption above the storage body, with thread control and monitoring devices (B, 19, 20) arranged on the thread delivery device, and with one integrated into the thread delivery device , at least one blow-out opening (22, 24, 24 ') for a directed air jet (J) having a nozzle device (D) connected to a compressed air supply (B), characterized in that the blow-out opening (22, 24, 24') points to the discharge area (A) of the thread delivery device (F), and that upstream of the blow-out opening an interrupter device (CD) for intermittent activation scattered burst pulses is provided.

2. Thread delivery system according to claim 1, characterized in that the interrupter device (CD) is switchable between a, preferably self-holding, shut-off position and a passage position.

3. Thread delivery system according to claim 1, characterized in that the interrupter device (CD) is manually operable.

4. Thread delivery system according to claim 1, characterized in that the interrupter device (CD) with a timing circuit or a control device (27) is combined for a predetermined clock sequence of the intermittent beam pulses.

5. Thread delivery system according to claim 4, characterized in that a regular or an irregular cycle sequence is adjustable, preferably with adjustment 13

of pauses between the intermittent beam pulses and setting the duration of each intermittent beam pulse.

6. Thread delivery system according to at least one of the preceding claims, characterized in that the control device (27) and / or the interrupter device (CD) is connected to a control device (CF) of the thread delivery device (F).

7. Thread delivery system according to at least one of the preceding claims, characterized in that the interrupter device (CD) and optionally the control device (27) on the thread delivery device (F) are arranged, preferably integrated into this.

8. Thread delivery system according to claim 1, characterized in that the thread delivery device (F) has a pneumatic threading device (T), and that the threading device (T) and the nozzle device (C) have a common pressure air supply (P), preferably with a switching device for Passivation of the nozzle device (D) during operation of the threading device (T).

9. Thread delivery system according to claim 1, characterized in that a common interrupter device (CD) is provided for a plurality of yarn delivery devices (F) of a yarn delivery system (L) or for a plurality of yarn delivery systems (L).

10. Thread delivery system according to claim 1, characterized in that the thread delivery device (F) with the storage body (7) cooperating, ring-shaped thread brake (B), and that several blow-out openings (24) are aligned with the inlet side of the thread brake (B).

11. Thread delivery system according to claim 10, characterized in that on a stationary support ring (9) of the braking element (11) of the thread brake (B) 14

the inlet side and / or the outlet side of the thread braking element (11), blow-out openings (24, 24 '), preferably on ring lines (21), are arranged.

12. Thread delivery system according to claim 1, characterized in that on a stationary mounting fork (9 ') of the braking element (B) on the outlet side of the thread brake (B) and / or the nose region (12) of the storage body (7) directed blow-out openings (24 ') are provided, and that, preferably, the holding fork (9') for supplying compressed air to the blow-out openings is hollow.

13. Thread delivery system according to claim 1, characterized in that a support part (3) for a trigger eye (4) is provided, and that, preferably in the support part (3), at least one outlet opening (22) is provided, which in the region of the trigger eye (4) aims.