EP1096046B1 - Method for cleaning the yarn brakes of a creel and trolley equipped with blowing nozzles - Google Patents

Description

The invention relates to a method for cleaning thread brakes of a gate according to the preamble of claim 1 and a blower cart according to the preamble of claim 5.

At the thread brakes of a gate through which the filaments withdrawn from bobbins are guided, settle dust, abrasion and lint. To ensure trouble-free operation and the same thread tension, it is necessary to clean the thread brakes. The thread brakes are also called thread tensioners. The term thread brake is intended to include thread clamping elements in this context.

From DE-A 31 41 727 a generic method and a generic blower for cleaning thread brakes of a gate is known. The blower has a rail-mounted chassis to which an air distribution unit is flanged with an air distribution pipe with blow-out on. For a gate on which the threads are guided floor by floor along the gate side, the blow-off elements have been extended by tube-like extension elements whose blow-off elements in the form of blow nozzles terminate directly on the thread brakes (thread tensioners). During operation, the Blaswagen constantly moves back and forth on a gate side and directs its air curtain-like blast beams against the thread brakes. To generate the blasting jets, it has its own fan with a motor. The cleaning with this blower car is very noisy due to the fan with motor. The constant air outlet leads to a high air flow. The effectiveness of this cleaning method and the blasher with respect to the removal of deposits on the thread brakes is unsatisfactory. It is also blown in areas outside of the thread brakes, resulting in high energy consumption and possibly disturbances of the yarn path.

The applicant is also known to integrate nozzles directly to the thread brakes in the gate. The nozzles are aligned against the thread running direction. Since a considerable draft, which results from the high withdrawal speed of the threads, is in conflict with the air pressure of the nozzles, this arrangement requires a higher air pressure in order to achieve a cleaning effect. Due to the large number of nozzles and the extensive installation of compressed air hoses, the flow losses are high. At least every two rows, a valve must be provided, the valves are controlled sequentially. A creel with thread clamping elements (clamping devices) and integrated nozzles is known from DE-A 42 13 859.

The object of the invention is to develop a method for cleaning thread brakes of a gate according to the preamble of claim 1 and a corresponding Blaswagen according to the preamble of claim 5, which allow a higher efficiency of cleaning; in particular by making it possible to selectively remove the depositions which occur preferably at certain points of the thread brakes.

The object is solved by the characterizing features of claims 1 and 5.

In a method according to the invention for cleaning thread brakes of a gate, which are arranged in vertical rows and floor by floor in the gate, a blower is guided along the side of the gate and stopped before each of the vertical rows of yarn brakes. During the stoppage, a small amount of compressed air is blown within each blowing interval by one or more nozzles arranged at front ends of cantilever beams and having small nozzle openings within a blowing interval.

The cross-section of a nozzle opening is 0.2 to 30 mm ² , preferably 0.2 to 10 mm ² , in particular for a plurality of nozzles in each floor.

By stopping the blast truck, the nozzles stay in a position in front of the thread brakes. The nozzles are designed so that nozzle orifices of the nozzles are directed to the points of the thread brakes at which settle deposits. The small diameter of the nozzle openings generate targeted jet jets at these deposition points of the thread brakes in the blowing interval. These targeted jets require only a small amount of compressed air for safe cleaning of the deposits. In the blowing interval, compressed air can be blown onto the thread brakes with little pressure and with a short duration. Therefore, it is possible to dispense with a separate fan with motor. A connection of the compressed air device to the usually existing compressed air network, e.g. from 6 bar, is completely sufficient. An impairment of the yarn path through a too strong, over the entire gate side extending Beblasung is avoided.

When guiding the blast truck along the gate, the nozzles attached to the cantilever beams require a certain distance from the vertical tensioner strips, to which the thread brakes are fastened, so that they can be safely moved past the tensioner strips. As a result, the lateral distance of the nozzles is limited to the thread brakes. With the nozzles attached to the jib carriers only lateral jets on the thread brakes are possible.

According to claim 2, the positions of the nozzles during the stopping of the blast carriage before the blowing interval of driving positions in blowing positions and after the blowing interval can be adjusted back into driving positions. This adjustment of the nozzle positions in blow positions makes it possible to approach the nozzle openings of the nozzles closer to the depositing points of the thread brakes. The positions of the nozzles can be adjusted in positions in front of, above or below the thread brakes, so that the nozzle jets can be directed in various directions depending on the requirements of the depositing points of the thread brakes.

According to claim 3, the positions of the nozzles can be adjusted by compressed air and these compressed air are blown in the blowing interval through the nozzles on the thread brakes. This has the advantage that only one compressed air device and by the Use of compressed air both for adjusting the nozzles and for blowing the yarn brakes only a small amount of compressed air is needed.

In addition, according to claim 4, the blower can be stopped at Ösenleisten the gate and compressed air are blown through parallel to the jib carriers extending blowgaps with distributed over their lengths blowing openings on the thread holding elements of the gate. Thus, in addition, the thread holding elements can be cleaned.

A blower for cleaning thread brakes of a gate has according to the preamble of claim 5, a rail-mounted chassis with a drive, a vertical support, horizontal, floor mounted jib support, at the front ends of each at least one nozzle is arranged and with a compressed air device to the nozzles leading air ducts. According to the invention, the blower comprises means for stopping in front of the vertical rows of yarn brakes and nozzles with nozzle openings with cross sections of 0.2 to 30 mm ² each

This blower is particularly suitable for carrying out the method according to claim 1. As already mentioned, the cross sections of the nozzle openings can preferably be 0.2 to 10 mm ^{2 in} each case.

The means for stopping in front of the vertical rows of yarn brakes may be program-controlled switching means connected to the drive which control the drive so that the blower truck stops just in front of the vertical rows of yarn brakes. These means may also comprise one or more sensors attached to the vertical support which detect the position of the vertical rows of yarn brakes, for example by means of the tensioner strips, and switching means of the drive connected to the sensors. By this means it is possible to stop the blower truck just in front of the vertical rows of yarn brakes.

For targeted cleaning of the thread brakes on, usually several deposition sites, it is advantageous over the appropriate number of nozzles, in accordance with Claim 6 at least two nozzles in a floor to dispose. For example, up to about ten nozzles can be used. The cross sections of the nozzle openings in the case of several nozzles in one floor are preferably 0.2 to 10 mm ^{2 in} each case.

According to claim 7, the blower truck has means for adjusting the positions of the nozzles between driving positions and blow positions with adjusting elements and with adjusting means which are connected to the adjusting elements. The adjusting elements may be the nozzles themselves or elements which are connected to the nozzles and whose adjustment the nozzles are mitverstellt, for example, the cantilever beams, the vertical support or additional elements be. The adjusting elements are connected to the adjusting means, which are e.g. can be pneumatic and / or mechanical means. By adjusting the adjusting elements can be moved, for example, moved or rotated, depending on the design of the Blaswagen and location of the driving and blowing positions of the nozzles in all possible directions, vertically, horizontally perpendicular to the direction of movement or in the direction of movement of the Blaswagens. This blower allows a more targeted. Blowing the thread brakes; it is particularly suitable for carrying out a method according to claim 2.

The adjusting elements may be formed according to claim 8 arranged at the front ends of the jib carrier nozzle body with at least two nozzles. When adjusting the nozzle body several nozzles can be adjusted in blow position simultaneously. This simplifies the adjustment of the nozzles and causes less structural complexity than an adjustment of individual nozzles. The formation of the nozzle body with the nozzles can be matched to the respective thread brakes that the nozzle openings are directed in blowing position on the deposition points of the thread brakes.

A simple embodiment of the adjusting means for adjusting the nozzle body are according to claim 9 pneumatic displacement means with horizontal pneumatic tubes and connected to the nozzle bodies piston, wherein the horizontal pneumatic tubes are formed by the cantilever beams Connecting lines from the cantilever beams to the nozzle bodies according to claim 10 are particularly suitable for a method according to claim 3, wherein the compressed air is used for moving also for blowing the thread brakes.

Further simple adjusting means for adjusting the nozzle body are according to claim 11 mechanical, associated with waves of the nozzle body rotation means. This allows for rotations, e. G., As an alternative to horizontal and possibly vertical displacement of the nozzle bodies. from oblique or vertical positions to horizontal positions. The corrugations of the nozzle bodies may, for example, be fastened to the rear ends of the cantilever beams. The rotating means for rotating the nozzle bodies may e.g. Have lever and adjustable, acting on the waves chains.

According to claim 12, an adjusting element is formed by a vertical adjusting support on which the cantilever beams 23 and thus the nozzles or the nozzle body are fixed to the nozzles. The adjustment can be performed on or in the vertical support. Adjustment means connected to the adjustment support can comprise vertical displacement means, for example with a pressure cylinder.

In addition, according to claim 13 can be arranged parallel to the jib carriers blowing tubes with distributed over its length blowing openings for cleaning the thread holding elements. Such a blower is particularly suitable for carrying out a method according to claim 4.

The invention will be further explained with reference to two examples schematically illustrated in the drawing. FIGS. 1 to 5 show the first example of a blower carriage, and FIGS. 6 and 7 show the second example of a blower carriage.

Figure 1 shows a side view of a gate with the blower truck of the first example, Figure 2 shows a, from the perspective of the gate, vertical cross-section through the Blaswagen and the gate in front of a Ösenleiste with thread retaining elements, Figure 3 shows a corresponding, slightly enlarged cross-section through the Blaswagen and the gate in front of a tensioner with thread brakes, Figure 4, the operation of the pneumatic displacement means for horizontal displacement of the nozzle body based on horizontal sections by a cantilever beam in 4 (a) and in the blowing position (FIG. 4 b) and the vertical displacement of the nozzle bodies by means of a vertical section (FIG. 4 c) perpendicular to the cross sections and FIG. 5 the structure of the blower tube by means of a vertical section through the cantilever beam and the blower tube.

FIG. 6 shows the blower carriage of the second example on the basis of a cross-section corresponding to FIGS. 2 and 3 through the blower carriage and the gate and FIG. 7 on the basis of a vertical section corresponding to FIG. 4c.

Example 1 (Figures 1 to 5):

Figure 1 shows a gate 1 with a Blaswagen 2 according to the invention in a side view in front of the gate 1 and in front of the blower carriage 2. The gate 1 extends in Figure 1 from left to right, starting from the gate start, on which a cabinet 3 is arranged to the gate end , The gate 1 has a cuboidal support frame with horizontal and vertical struts 4, 5, wherein the vertical struts 5 extend to the bottom 6.

On the support frame, a not shown in the drawing coil holding frame with coil holders 7 for receiving coils 8 is attached. The bobbin holders 7, and thus the bobbins 8, are arranged in vertical and horizontal rows, the horizontal rows being referred to below as floors. In FIG. 1, only the contours of the coils 8 and in FIG. 2 coil holders 7 and coils 8 are shown.

On the support frame is a tensioner frame with extending in front of the coil 8, vertical strips, tensioning strips called 9, where thread yarns 10 are fixed by tiers arranged. The tensioner 9 are located in the area of outer, vertical struts 5 of the support frame and are displaced with this for equipping the gate 1 to the outside.

On the outer, vertical struts of the support frame are horizontal strips, eyelet strips 11 on which thread holding elements 12, e.g. Ceramic loops, fixed, arranged. The number of juxtaposed thread holding elements 12 and thus the length of the eyelet strips 11 increases towards the gate start. Figures 2 and 3 show Ösenleisten 11 near the gate beginning.

To accommodate the Blaswagens 2 is at upper, horizontal cross members 13 of the support frame, which protrude laterally outwardly beyond the horizontal and vertical struts 4, 5, a perpendicular to the struts 5 arranged, horizontal carriage carrier 14 is attached. The carriage carrier 14 extends along the gate 1 from the gate beginning to beyond the gate end. The area behind the gate end serves as a parking position of the Blaswagens 2

An inventive blow truck 2 has a rail-mounted chassis with casters 15 and, in this example, two drive rollers 16 and with a drive 17, e.g. an electric motor whose shaft is connected to the drive rollers 16, on.

The drive rollers 15 and the drive rollers 16 are guided on the correspondingly shaped carriage carrier 14. The directions of movement of the chassis and thus of the Blaswagens 2 along the gate 1 are indicated by the arrows 18 and 19. On the chassis limit switch 20 are attached to the sides to the directions of movement 18, 19 out. At the car carrier 14 21 forming sheets are installed at its beginning on the gate start and its end behind the gate end, which are in the corresponding position of the Blaswagens 2 with sensors of the limit switch 20 in contact.

At the chassis closes down, possibly a connecting element and a vertical support 22, from the floor-mounted horizontal AuslegerTräger 23 go out, on. At the front ends of the cantilever beam 23 are nozzle body 24 with at least two nozzles 25, here with five nozzles 25, respectively. The blower 2 has a compressed air device with leading to the nozzle bodies 24 and thus to the nozzles 25 air lines. In or on the connecting element, not shown in the drawing, supply elements of the compressed air device, such as a compressed air connection, a pressure reducer and a valve to which a leading to the nozzle bodies 24 air lines connected air distribution device is connected, and optionally arranged switching elements of the drive 17 , The connecting element may be formed as a housing. In this example, the connecting element has a connecting plate 26 and a control box 27. A guided in the carriage support 14 energy chain 28 includes the control cabinet 27 leading power lines and leading to Druckluftanschlüß compressed air line.

The blower 2 has means for stopping in front of the vertical rows of the yarn brakes 10 and means for stopping on the eyelet strips 11 of the gate 1. The means for stopping in front of the vertical rows of the thread brakes 10 have in this example a arranged in the upper region of the vertical support 22 Nutrition sensor 29 which emits 9 switching pulses on reaching the vertical tensioner strips and is connected to the switching means of the drive 17. The means for stopping the Blaswagens 2 on the eyelet strips 11 may also have this foresight sensor 29, which can deliver switching pulses to the switching means of the drive 17 even when reaching the outer vertical struts 5 of the support frame with the eyelets 11.

In this example, the means for adjusting the nozzles 25 have horizontal displacement means connected to the nozzle bodies 24 and vertical displacement means connected to an adjustment support 30; ie the adjusting elements are formed by the nozzle body 24 and the adjusting support 30 and the adjusting means by the horizontal and vertical displacement means. The directions of movement of the nozzles 24 by the horizontal and vertical displacement means show the arrows A and B in Figure 3 and the arrows a and b in Figure 4, wherein in Figure 4, the lengths of the arrows a and b correspond to the lengths of the displacements.

The adjustment support 30 is a guided by guides 31 on the vertical support 22 tube to which the cantilever beam 23 are attached. The vertical displacement means connected to the adjustment support 30 are pneumatic means with a pneumatic cylinder 32 indicated in FIG. 2 (for the sake of clarity but not in FIG. 3).

The associated with the nozzle bodies 24 horizontal displacement means are pneumatic displacement means formed by the cantilever beam 23 pneumatic tubes whose pressure chambers 33 are provided with a compressed air connection 34 and in the region of the front ends of the cantilever beam 23 are closed by the piston 35 before the compressed air connection 34. The pistons 35 are connected via square tubes 36 with the nozzle bodies 24. At the front ends of the cantilever beam 23 are plugs 37, through which the square tubes 36 are guided and serve as locking of the piston 35 in the blowing positions (Figure 4 b). The pneumatic displacement means further comprise tension springs 38 extending in the pressure chambers 33, which are e.g. are mounted at their front ends in openings 39 of fasteners 40 fastened to the piston 35 and at their rear ends in transverse pins 41 fastened in the cantilever beams 23.

The adjustment support 30 is also designed as a pneumatic tube which is in operative connection with the cantilever beams 23 designed as pneumatic tubes. By a pressure chamber 42 of the adjusting support 30, the total available pressure chamber volume is increased.

The pneumatic displacement means also have a compressed air line 43 guided along the adjusting support 30, which branches in tiers in compressed air lines 44 led to the compressed air connections 34 of the arm support carriers 23. The compressed air lines 43, 44 are, as is apparent from Figure 4, mounted on the side facing the yarn brakes 10 side of the cantilever beam 23. you are hidden in the view of Figure 3 by the VerstraBtracer 30 and therefore shown in dashed lines.

The nozzle bodies 24 have housings, e.g. Pipe sections 45, which are closed at their front ends by cover 46, on. The square tubes 36 are screwed to the covers 46.

In the driving position (FIG. 4 a), the tube sections 45 enclose the front ends of the jib carriers 23, wherein interior spaces 47 of the tube sections 45 are completely filled by the jib carriers 23. The inner cross sections of the pipe sections 45 are dimensioned so that they are displaceable on the jib carriers 23. In this example, the cross sections of the cantilever beams 23 and the pipe sections 45 are round (Figure 4c).

In blow position (Figure 4b), the pistons 35 of the pneumatic displacement means are displaced by the distance (arrow a) to the thread brakes 10 and touch the plugs 37. The nozzle bodies 24 project beyond the front ends of the cantilever beams 23, their interiors 47 are up on the square tubes 36 free. Close to the front ends of the boom support 23 leading compressed air connections 48 are attached to these interiors 46.

The nozzle bodies 24 each have two rows of nozzles 25, namely an upper row with three in the extension direction of the cantilever beam 23 juxtaposed nozzles 25 and a lower row with two likewise juxtaposed nozzles 25 on. The nozzles 25 are formed from inserted into the pipe sections 45, extending at an obtuse angle tube 49 directed to the thread brakes 10 nozzle openings 50. The cross sections of the nozzle openings 50 are in each case 0.2 to 30 mm ² , in particular 0.2 to 10 mm ² . In this example, the diameters of the nozzle orifices 50 are each 1.2 mm and their cross sections are each about 1.13 mm ² . The sum of the cross sections of the nozzle openings 50 of the five nozzles 25 in one level is approximately 5.65 mm ² .

The arrangement of the nozzle openings 50 of the nozzles 25 is matched to the respective yarn brakes 10. In this example, yarn brakes 10 are used with two plates 51 with deposit points on the side of the plates 51 and between the plates 51 and below the plate 51. At these deposition sites aim the nozzle openings 50 in blowing position.

The pneumatic displacement means may have a compressed air connection which is separate from the existing compressed air device supplying the nozzles 25 and to which the compressed air line 43 running along the adjusting support 30 is connected. In such a case, the air lines of the compressed air device would be connected directly to the compressed air connections 48 of the nozzle body 24.

In this example, the existing compressed air device simultaneously forms the pneumatic, horizontal displacement means for supplying compressed air to the nozzles 25. For this purpose, the vertical compressed air line 43 of the pneumatic displacement element is connected to the feed elements of the compressed air device and serves the compressed air device as Luftverteilvorrichtung. The leading to the nozzle bodies 24 air lines are formed by the compressed air lines 44, the boom support 23 and closable connection lines 52 which are guided by the compressed air connections 34 of the cantilever beam 23 to the compressed air connections 48 of the nozzle body 24. The compressed air connections 34 of the jib carriers 23 are designed as valves which are respectively connected to the corresponding compressed air lines 44, the pressure chambers 33 of the jib carriers 23 and the connecting lines 52 and through which the connecting lines 52 can be closed, wherein the valves are in compressed air lines 44 in the compressed air close the outputs to the connecting lines 52 and open the outputs to the connecting lines 52 with decreasing pressure in the compressed air lines 44.

The pneumatic means with the pneumatic cylinders 32 for vertical displacement of the adjustment support 30 may also be connected to the feed elements of the existing compressed air device.

On the cantilever beams 23 are extending parallel to the cantilever beam 23 extending blowpipes 53 distributed over their lengths blowing openings 54. They are each provided with a Druckluizaischluß 55, which is optionally connected to the corresponding compressed air line 44. They can be fastened to the cantilever beams 23 via connecting elements 56.

In operation, the yarn brakes are cleaned by the blower 2 is guided along with the nozzle bodies 24 in the direction of travel laterally on the gate 1 and stopped before each of the vertical rows of yarn brakes 10 by the Nährungssensor 29 of the means for stopping the respective tensioner bar 9 detects and his Switching pulses trigger the switching means of the drive 17.

In front of a tensioner bar 9, i. during the stopping of the pram 2, the positions of the nozzles 25 are adjusted by the means for adjusting the nozzles 25 of driving positions in blowing positions. For this purpose, the adjusting support 30 is first moved by the pneumatic means with the pneumatic cylinder 32 in the direction of arrow B (Figure 3) by the amount shown by arrow b (Figure 4c) vertically upwards.

Subsequently, the nozzle body 24 by the pneumatic displacement means in the direction of arrow A (Figure 3) by the amount shown in arrow b (Figure 4b) pushed horizontally forward by the pressure chambers 33 of the boom support 23 and the pressure chamber 42 of the Verstellträgers 30 via the compressed air lines 43, 44 are filled with compressed air and the piston 35 and thus on the square tubes 36, the nozzle body 24 against the force of the tension springs 38 are pushed forward. Now, the nozzle body 24 and thus the nozzles 25 are in blowing position, wherein the nozzle openings 50 of the nozzles 25 are directed to the thread brakes 10, namely at their deposition sites.

In the following blowing interval a small amount of compressed air is blown through the nozzles 25 small nozzle openings 50 on the thread brakes 10 in each floor by the compressed air lines 43, 44 supplied compressed air is turned off and in the pressure chambers 33 of the boom support 23 and in the pressure chamber 42 of the adjustment 30 accumulated compressed air from these over the through Pressure drop switching valves of the compressed air connections 34 and is blown over the connecting lines 52 into the interiors 47 of the nozzle body 24 and from there through the nozzle openings 50 on the thread brakes 10.

Once the air pressure in the pressure chambers 33 of the cantilever beam 23 is less than the spring force, the nozzle body 24 are moved back by the tension springs 38 in their original positions. Subsequently, the adjusting support 30 is lowered to its original position, so that the nozzle body 24 and thus the nozzles 25 are again in the driving position.

In addition, the blower 2 is stopped at the eyelet strips 11 supporting vertical struts 5 of the support frame of the gate 1 and compressed air blown through the blowpipes 53 and their blow holes 54 on the thread holding elements 12.

Example 2:

Example 2 corresponds to Example 1 except for the differences described below.

The means for adjusting the nozzles 25 between driving positions and blowing positions have adjusting elements nozzle body 57 with a, attached to the front ends of the cantilever beam 23 shaft 58 and as adjusting mechanical, connected to the shaft 58 and, possibly pneumatic, rotating means. The mechanical turning means comprise chains 59 which are guided via first sprockets 60 connected to the shafts 58 and second sprockets 51 arranged at the rear ends of the cantilever beams 23. The second sprockets 61 are connected to levers 62. The levers 62 are articulated on a rod 63 guided on the vertical support 22. The rod 63 is vertically displaceable by mechanical means or, as shown here, by pneumatic means with a pressure cylinder 64. The pneumatic means may be connected to the existing compressed air device. The leading directly to the nozzle bodies 57 air lines of the compressed air device are not shown in Figures 5 and 6.

The sprockets 60 may also be connected via friction pads with the nozzle bodies 57, which allow dodge the nozzle body 57 when hitting obstacles.

The nozzle bodies 57 can each be formed, for example, from a plastic block with a lever section 65 and a nozzle section 66. The nozzle portion 66 has two rows of nozzles 25 and L-shaped, wherein in the blowing position (Figure 6) the upper nozzle rows of three nozzles 25 having Direction leg 67 of the L 's vertical and the other, the lower nozzle rows of two nozzles 25 having leg 68 extends horizontally. In the blow position, the vertically extending leg 67 is located in front of the .. thread brake 10 and the horizontally extending leg 68 protrudes under the thread brake 10. Both legs 67, 68 have approximately the same leg length; The width of both legs 67, 68 corresponds approximately to the width of the thread brake 10. At the upper end of the vertically extending leg 67 is located in its interior a parallel to its upper edge extending bore 69, of the three horizontally outwardly to the yarn brake 10 leading three upper nozzle 25 forming nozzle holes 70 go out. At the projecting under the yarn brake 10, the front end of the horizontally extending leg 68 of the L's is located in its interior a parallel to its front edge extending bore 71, of the two vertically upwards to the yarn brake 10 and leading to the outside, the two lower nozzles 25th forming nozzle holes 72 go out. The nozzle bores 70 and 72 form at their exits from the nozzle body 57, the nozzle openings of the nozzle 25. The bores 69 and 71 are connected by further bores 73, 74, 75 with each other and with a compressed air connection 76. At this compressed air connection 76, the corresponding air line of the existing compressed air device is connected.

In operation, the nozzle body 57 during the stopping of the Blaswagens 2 in front of the tensioner strips 9 first from their driving positions, in which their nozzle sections 66 point downward, in the blowing position in which the vertical leg 67 of their nozzle sections 66 in front of the thread brakes 10 and horizontal leg 68 of their nozzle sections 66 are arranged under the thread brakes 10, rotated in the direction of arrow C. For this purpose, the rod 63 and with it the lever 62, down here, and moved over the sprockets 60, 61 and the chain 59, the shafts 58 of the nozzle body 57 via the air cylinder 64. In the blowing positions, the compressed air is guided directly into the nozzle body 57 during the blowing interval and blown through the nozzle bores 70, 72 onto the thread brakes 10.

Claims (13)

1. Method for cleaning yarn brakes (10) of a creel (1) which are arranged in vertical rows and in tiers in the creel (1), in which a blower trolley (2) is guided along the side of the creel (1) and in each tier compressed air is blown through at least one nozzle (25) onto the yarn brakes (10) which nozzle is arranged at the front ends of jib carriers (23) of the blower trolley (2), characterised in that the blower trolley (2) is stopped in front of each of the vertical rows of yarn brakes (10) and within a blowing period in each tier a small amount of compressed air is blown through one or more nozzles (25) with small nozzle openings (50) onto the yarn brakes (10).
2. Method according to claim 1, characterised in that when the blower trolley (2) stops before the blowing period the positions of the nozzles (25) are adjusted from drive positions to blowing positions and after the blowing period the positions are returned to the drive positions.
3. Method according to claim 1 or 2, characterised in that the positions of the nozzles (25) are adjusted by compressed air and the compressed air is blown in the blowing period through the nozzles (25) onto the yarn brakes (10).
4. Method according to one of claims 1 to 3, characterised in that the blower trolley (2) is stopped at the eyelet bars (11) of the creel (1) and compressed air is blown onto yarn holding elements (12) through blowing tubes (53) arranged parallel to the jib carriers (23) with blowing openings (54) distributed over their length.
5. Blower trolley for cleaning yarn brakes (10) of a creel (1) which are arranged in vertical rows and in tiers in the creel (1) with a rail-connected frame with a drive (17), with a vertical carrier, with horizontal jib carriers (23) arranged in tiers, at the front ends of which at least one nozzle (25) is arranged and with a compressed air device with air lines running to the nozzles (25), characterised by means for stopping the blower trolley (2) in front of the vertical rows of yarn brakes (10) and by nozzles (25) with nozzle openings (50) with cross sections of 0.2 to 30 mm².
6. Blower trolley according to claim 5, characterised by at least two nozzles (25) arranged at the front ends of the carrier jibs (23).
7. Blower trolley according to one of claims 5 or 6, characterised by means for adjusting the position of the nozzles (25) with adjusting elements and with adjusting means connected with the adjusting elements.
8. Blower trolley according to claim 7 characterised by nozzle bodies (24) arranged at the front ends of the jib carriers (23) with at least two nozzles (25) which form adjusting elements.
9. Blower trolley according to claim 8, characterised in that the adjusting means comprise pneumatic displacement means with horizontal pneumatic tubes and with pistons (35) connected to the nozzle bodies (24), whereby the horizontal pneumatic tubes are formed by the jib carriers (23).
10. Blower trolley according to claim 9, characterised in that the air lines leading to the nozzles (25) comprise closable connection lines (52) from the jib carriers (23) to the nozzle bodies (24).
11. Blower trolley according to claim 8, characterised in that the nozzle bodies (24) comprise shafts (58) and the adjusting means mechanical rotational means connected with the shafts (58).
12. Blower trolley according to one of claims 5 to 11, characterised in that an adjusting element is formed by a vertical adjusting carrier (30) onto which the jib carriers (23) are secured.
13. Blower trolley according to one of claims 5 to 12, characterised by blower tubes (53) extending along the jib carriers (23) with blower openings (54) distributed over their length.

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