HU204107B - Pick-braking and -tentering apparatus for micro-shuttle looms - Google Patents

Abstract

The weft thread is moved to the shedding orifice by at least one air jet blow-pipe. During rest periods the weft thread reserve is kept in a thread store. The thread is moved to this position by a feed blow-pipe before the movement. After the movement a tensioning blow-pipe pulls back the thread. Both the blow-pipes are provided with a pressure control valve. - Air is provided through a control valve operated by the rotation of the weaving machine main shaft

Description

BACKGROUND OF THE INVENTION The present invention relates to a weft stopping and tensioning apparatus for micro-weft weaving machines, comprising at least one dispensing nozzle for delivering a weft yarn to a nozzle opening for micro-weft weaving; In the direction of the weft input, there is a yarn container after the dispensing nozzle, which has a base plate and cover and has an interior space between the two for transferring the weft yarn and storing the yarn reserve.

Nowadays, the development of weaving technology has taken a new direction, turning away from the further development of traditional knitting machines, the so-called small weaving machines. micro-weaving machines and / or warping pneumatic weft-type weaving machines.

Micro-weaving machines are characterized by the fact that the weft yarn is retarded when passing a small weft carrier through the mouth opening and then, on arrival, stopped by a very short length of a few cm. After being braked, the microfabricated tissue is returned to the tissue so that it can be removed from the braking apparatus, thereby making it suitable for receiving a new millofoam from the braking apparatus.

In micro-weaving machines, in addition, after the weft is fed, the starter side moves a yarn gripper near the edge of the fabric, where it grips the weft yarn inserted into the mouth opening while knitting the weft yarn, and then cuts it with a pair of scissors. The thread clamp then returns to its home position with the free thread end in place to insert the clamped thread end into the microfibre clips.

During weaving, the weft yarn is wound from the bobbin winding almost continuously, while the weft yarn is fed into the mouth opening intermittently. Also in the case of microfiber weaving machines, according to the operations described above, the weft yarn must be repeatedly stretched at various stages of weft input. Needle Thread Tensioning Required: When inserting the weft yarn, re-inserting the micro-weft, and retracting the tweezer.

The weft yarn is currently being tensioned, on the one hand, by means of an adjustable weft brake, and, on the other hand, by a controlled movement of a tensioning arm which swings in a plane perpendicular to the weft yarn.

Weft yarn stopping is usually achieved by clamping a ceramic and a spring steel plate, increasing the frictional force acting on the yarn.

Adjust the swinging of the tensioning arm to match the operation of the weft brake, otherwise the tensioning arm will not stretch the weft yarn in your mouth, but the bobbin thread.

Especially critical is the process of weft stretching while retracting the micro-weft and retracting the tweezers. The micro-weft tweezers hold the end of the last inserted weft during the retraction period, so that the retrograde end of the weft retracts during the retraction, so that the retraction is reversed on the reverse side to avoid loosening and the associated looping.

During the retracting of the pliers, loosening or over-stretching of the liberated thread should be avoided. This task is carried out on a micro-weaving machine, by the operation of the ve5 seat brake and the tensioning lever, by a cam-driven mechanism.

In micro-weft looms with extra weft yarns, the number of controlled weft brakes and tension arms is the same as the number of weft yarn types operated by sliding cams on 10 ribs. Each type of weft yarn operates according to the control of the color selection mechanism. All of these solutions are complex and can cause malfunctions and warp thread breaks 15 at higher machine speeds.

In the field of weaving technology, it also seeks to overcome the drawbacks of cam mechanisms and replace them with other solutions. Thus, there are known various yarn winding and yarn storage structures for air jet weft input systems. In these cases, the yarns unrolled during sowing are stored in the form of a U-shaped loop or along a helix formed on the periphery of a cylindrical body of a given size or in a slip-type yarn container until the next application. 25 Wiping and dispensing of the weft yarn into the mouth opening is generally accomplished by nozzle systems moving with the rib family in the prior art. Such is disclosed in U.S. Patent No. 4,369,817. U.S. Patent No. 3,122,139; DE publication also. The wiper braking and tensioning required in the ve30 sets is a40090536sz. U.S. Pat. No. 4,123,195 discloses a solution which includes a storage tube for vacuuming a wiper suction tube near the feeder nozzle for moving the weft yarn from the cross winder, which is carried with the rib family. In this storage tube, the yarn reserve is stored in a U-shaped loop until the next run, and the weft yarn is properly tensioned by the suction nozzle retracting the weft yarn.

From another patent document, U.S. Patent No. 155,432. From European Publication Specification, an air jet feed nozzle for weaving a microfabric weaving machine is further known as a nozzle system for compensating weft voltage. A jet of jet air, directed in the same direction as the loading of the weft yarn, accelerates the weft yarn passing through it,. and an opposite jet air jet, which is disposed opposite, exerts a braking effect. There is even a nozzle for transferring the yarn directly in front of the microfibre. Again, the storage of the yarn reserve during seed breaks is in a U-shaped loop, between the stripping from the crosswheel and the stop nozzle.

In the case of air jet weaving machines, a yarn store having a narrowing storage area has been developed to accommodate the weft yarn reserve stored at intervals of 55 seconds. HU patent. The filament container described here, together with the associated auxiliary nozzle, holds the drive mechanism of a four-threaded rib box2

EN 204107 Β and moves with it.

It is not possible to pull excess weft yarn back into the yarn store.

It is an object of the present invention to provide a weft braking and stretching device for microfiber weaving machines that replaces the weft brakes and weft yarn braking levers controlled so far by the cam discs and solves the appropriate feeding of the weft yarn. Simple weft length balancing and on-line grooming to suit your needs will reduce quality defects and keep the weft continuously tightened eliminates looping. The adjustable, almost constant yarn tension saves the weft yarn, reduces the number of weft yarn breaks and, consequently, increases the weaving performance by increasing the speed.

SUMMARY OF THE INVENTION It is an object of the present invention to use yarn-brake and tension levers controlled by the cam mechanism of microfabric looms and to provide air-jet weft feed and yarn storage by partially utilizing elements known per se on air jet looms.

The inventive idea is based on the fact that, by omitting the camshaft-controlled tensioning arm and the thread brake, the formation of the thread reserve required in operation is solved by a thread storage device (HUPS 191794) developed in the previous invention. However, this yarn store is cheating to supply the yarn for the operation, and it is not yet resolved to stretch and retract the weft yarn that is redundant when the microwire is retracted and the retractor is retracted. After removing the yarn container from its former location from the drive mechanism of the rib box, it was also necessary to develop an air jet solution for weft tensioning.

A further aspect of the present invention is to realize that the yarn storage dispenser is disposed on the opposite side of the nozzle by a tension nozzle having air supply in the opposite direction and is operated for a defined period of time during the weft movement. It is advantageous to combine the operating cycle with the crankshaft rotation. The transducer members for control are also located on the crankshaft of the loom.

In accordance with the object of the present invention, it is also within the scope of the present invention to further develop the filament container by providing symmetrically expanding and narrowing ranges.

According to an object of the present invention, the weft stopping and tensioning apparatus of the present invention comprises at least one dispensing nozzle for delivering a weft yarn to a mouth opening, optionally with a weft dispensing nozzle, such as it is completed, there is a filament container located downstream of the dispensing nozzle, having a base plate and a lid for the filament container, and having an interior space between the two for transferring the weft yarn and storing the yarn reserve, such that has a tension nozzle facing upstream of the dispensing nozzle, the tension nozzle being a drain outlet at the end of the thread container 'Is disposed slot, the discharge nozzle and the stretching nozzle is provided with a pressure regulating throttle valve, the injection nozzle and / or the stretching nozzle and the loom main shaft is coupled by means of angular displacement operated control valve.

A further feature of the weft stopping device of the present invention is that the number of yarn stores is equal to the number of different colors and / or types of weft yarns used in the weaving, and each yarn store has one feeding nozzle and one stretching nozzle.

Another feature is that the control valve for supplying air to the dispensing nozzle and the tensioning nozzle has an optoelectronic sensing member, and one or more members appearing on the crotch axis and appearing on the optoelectronic sensing path of the crankshaft.

The interior of the yarn store for accommodating the yarn reserve of the weft yarn has an expanding region and a narrowing region.

The yarn storage cover is fixed to the base plate by pins and there is a full cross-sectional gap between the yarn storage cover and the base plate.

In one embodiment of the yarn container, permanent magnet inserts are sewn into the motherboard, and screws are provided in threaded inserts to adjust the gap size in the lid opposite the permanent magnet inserts.

In another embodiment of the filament container, the brake plate has a fitting tip, a screw in the cap which is threaded against the fitting tip to adjust the size of the stop gap, and a compression spring is inserted between the screw and the fitting tip.

The phonon container in any embodiment is preferably made of translucent plastic.

The invention will now be described in more detail with reference to the drawings. The accompanying drawings show

Figure 1 is a schematic representation of the weft braking device of the present invention, a

Fig. 2 is a diagram of the operation of the tension nozzle versus the crankshaft rotation of the loom,

Figure 3 is a schematic top view of a weft brake device, a

Figure 4 is a longitudinal sectional view of the arrangement of Figure 3, a

Figure 5 is a V-V marked in Figure 3. intersection, and finally the

Figure 6 is a sectional view of a possible adjusting solution of the yarn storage brake plate and the gap between the covers.

Figure 1 is a schematic view of the weaving side of the looms, removing the conventional weft brakes and tension arms. The loom is one

EN 204107 Β is a multicolour machine illustrating two independent weft braking devices suitable for using two different weft yarns according to FIG. The weft yarns 15 pass through each of the yarn containers 11 towards the micro-wool 3. The weft yarn 15 is passed to the micro-weft 3a 5 by the yarn feed lever 4a. At one end of the yarn container 11, at the end of the weave yarn 15, there is a feeding nozzle 7, and at the end of the weaving yarn, a tensioning nozzle 5. The air supply pressure of both the dispensing nozzle 7 and the tensioning nozzle 5 can be adjusted by adjusting the permeability of the throttle valves 6 and 8 to the desired value. Adjustment can be made separately in the knowledge of the quality, fineness and sowing length of the weft yarn 15.

The metering nozzle 7 and the tensioning nozzle 5 receive the compressed air 15 through the throttle valves 6 and 8 from the control valve 1, the connecting openings being preferably interconnected by flexible plastic pipes. The 6 and 8 throttle valves can be selected as either a 2/2 or a 3/2 speed shift valve. 20

The former merely provides for the passage or closure of the air jet, while in the latter it is also possible to eliminate the excess pressure remaining in the metering nozzle or the tensioning nozzle 5 through the vent opening of the 3/3-way reversing valve. Each thread container 11 has a control valve 1, the control edge 1 being at least a four-way valve, i.e. a 4/2 reversing valve, which alternately supplies air to the dosing nozzle 7 and to the tensioning nozzle 5.

Alternatively, weft braking can be achieved by providing only the tension nozzle 5 or the nozzle metering nozzle 5 only with intermittently controlled compressed air while providing the other nozzle with a continuous jet of air.

The change of the control valve 1 may also be mechanically performed, as symbolically indicated in Fig. 1, depending on the crankshaft rotation 35 of the loom. Thus, the axis of rotation 2 moves the actuating lever 4 guided through the lever 3 in its fork, and the control valve 1 for the respective filament container 11 then changes to the supply of air to the nozzle 40 at the nozzle 5 or vice versa.

In one switching state of the control valve 1, one can supply separately adjustable pressure air to a metering nozzle 7 and a tensioning nozzle 5 for one type of weft yarn and to a metering nozzle 7 and a tensioning nozzle 5 for any other weft 15. When the weft yarn 15 is braked, the tensioning nozzle 5 receives a pressure P _f , the control of which is described in connection with FIG. 50

The pneumatic valves used for actuation are known per se, are readily available and can be wired in a known manner in accordance with the function described above.

All yarn storage is made up of two separable parts, leaving 12 slots between them. The size of the slit A12 is adjustable. The weft yarn 15 is stored in an interior space between the pins 9 and 10 facing each other.

Fig. 2 shows an operating diagram of the tensioning nozzle 5 during the rotation of the crankshaft crankshaft. Signal level "0" indicates the closed state of the tension nozzle 5 and signal level "1" indicates the open state, i.e., the operating state, when P _{f is} receiving compressed air.

In the abscissa, the angular rotation of the crankshaft φ is depicted in degrees. The indicated angular values can be interpreted as follows.

A is the start of the previous action;

B interruption and start of reinstatement;

C the start of weft braking (at the end of the mission);

D finish the weft input; amikrovetélővisszatolásánakkezdete;

E is the completion of the reset and the beginning of the desalination of the dispenser;

F is the end of the yarn feeder downturn;

Gr color change (another 15 wefts will be deployed).

Based on the above, the duration of each operation as a function of the crankshaft rotation:

Bump A-B (between 0 ° and 140'),

B-D sowing (between 140 'and 290');

C-D weft braking (270 ° to 290 °),

D-E return (between 290 'and 360');

E-F yarn feeder downslope (new spin between 0 * -60 *);

G color change (at 90 ').

The tension nozzle 5 receives compressed air during two crankshaft revolutions at about 180 'and during this time pulls the weft thread 15 back into the filament container. Note that the control valve shift control is directly optoelectronic from the crankshaft. In the crankshaft, in accordance with the angular positions described above, two discs or pins are to be placed as transducer members, and optoelectronic sensing means, e.g. photodiode or photoresistor The resulting electronic signal must be applied to the control valve 1 after processing, which in this case is preferably electromagnetic. In Fig. 2, the continuous line represents the operation of the tension nozzle 5 for one type of weft yarn 15 and the dashed line for the other type of weft yarn 15.

Figure 3 is a schematic top view of the entire weft brake device. The weft yarn 15 is peeled off from the cross winder 17, in a loose state, forming a larger arc weft hang 15a. The weft yarn 15 passes through the opening 19 of the balloon breaker 18 towards the yarn store 11. In the yarn container 11, the dispensing nozzle 7 enters at the weft inlet 28 and then, after the weft outlet 29, passes through the tension nozzle 5 in the direction of the filament guide eye 21 and the micro-wool. Fig. 3 illustrates the state of braking and retraction of weft yarn 15 as the weft yarn 15 moves in the retracting direction 16a to form a yarn reserve 14 in the narrowing region 11b of the yarn store. The thread reserve 14 is formed in the form of an octave in the space delimited by pins 9 and 10. The tension nozzle 5 then receives compressed air.

HU 204 107 Β

Prior to deployment of the weft yarn 15, during the operation of the dispensing nozzle 7, a yarn reserve 14 is formed in the expanding region lla of the all-yarn storage. The two pressure regulating throttle valves 6 and 8 are shown only symbolically.

Fig. 4 illustrates the state of warp yarn 15 deployment as the weft yarn 15 moves in the warp feed direction 16b. Now, the dispensing nozzle 7 receives compressed air at the inlet 27 while the expansion nozzle 5 is closed.

Fig. 4 is a longitudinal sectional view showing the gap 12 between the lid 22 and the base plate 23 of the yarn container 11. The pins 9 and 10 are inserted into holes formed in both the cover 22 and the base plate 23. In the tensioned state of the weft yarn 15, there is only a smaller weft hang 15b than the cross stitch 17.

Figure 5 is a view of the yarn container 11 in Figure 3 V-V. A weft 15 is shown in the center of the gap 12. In this embodiment, the cover 22 can be detached from the motherboard 23 since they only adhere to one another magnetically. Magnetic inserts 24 are inserted into the motherboard 23 and threaded inserts 25 are glued to each other in the cover 22. Soft screws 20 are threaded into the threaded inserts, overhanging to the height of the desired slot 12. The height of the slit 12 is selected depending on the fineness of the weft yarn 15, according to the degree of braking desired. For common cotton yarns with a common range of 20 to 40 tex limits, it has proven advantageous to have a slot height of 1.5 to 2 mm.

Fig. 6 shows a possible braking adjustment in which the desired size 12 for the weft yarn 15 is formed between the brake plate 31 and the base plate 23. An insert tip 35 is glued to the brake plate 31 and a threaded insert 34 to the cover 22. Inside the threaded insert 34, a spring 33 is held, which is clamped by the screw 32. Adjustment of the stop slit 37 and the slit 12 therewith can be effected by means of the adjusting nut 36.

The yarn container 11 of the present invention is preferably made of a transparent plastic so that the formation of the yarn reserve 14, if any, is observed. A further advantage of the side wall open-ended yarn container 11 over the prior art is that, from the yarn reserve 14 formed during the warping of the weft yarn 15, the eighth loops extend a few millimeters all the way between the pins 9 and 10 to become xylos on it. the storage space becomes self-cleaning.

The main advantage of the anti-roll device according to the invention is that it can be used to replace the brakes and tension arms actuated by a conventional cam mechanism and instead to be fitted with a controlled air-jet feeder and tension nozzles connected to a thread container. The conversion can be done relatively easily. Micro-weaving machines can increase the speed by 1520%, reduce warp breaks, and improve the quality of fabric produced with tightly held weft yarns.

Claims (8)

A weft stopping and tensioning device for micro-weft weaving machines, comprising at least one feed nozzle for feeding a weft yarn for micro-weft weft feed, optionally including a weft feed nozzle with additional nozzles, e.g. after the nozzle, a filament container is provided, the filament container having a base plate and a lid and having an interior space between the two for transferring the weft and storing the yarn reserve, characterized in that the weft stopping device is disposed in the opposite direction to the feed direction. having a tensioning nozzle (5) opposite to its flutes (7), the tensioning nozzle 95) at the weft outlet at the end of the yarn storage (11) (29) is provided, the dosing nozzle (7) and the tensioning nozzle (5) are provided with a pressure regulating throttle (6,8), and the dosing nozzle (7) and / or the tensioning nozzle (5) are rotated by the angular rotation of the loom is connected to an actuated control valve (19). (Priority: 06/07/1988) A weft stopping and tensioning device according to claim 1, characterized in that the number of yarn stores (11) is equal to the number of different colors and / or types of weft yarns (15) used in the weaving and one feeding nozzle for each yarn store (11). (7) and one tensioning nozzle (5). (Priority: 06/07/1988) The warp braking and tensioning device according to any one of claims 1 or 2, characterized in that the feeding nozzle (7) and the control valve (1) for supplying air to the tensioning nozzle (5) have an optoelectronic sensing member and one or more transducer members appearing as a function of the crankshaft angles and detectable by the optoelectronic sensing means. (Priority: 06/07/1988) 4. A weft braking and stretching device according to any one of claims 1 to 5, characterized in that the interior of the yarn storage (11) for accommodating the yarn reserve (14) of the weft yarn (15) has an expanding region (11a) and a narrowing region (11b). (Priority: 30.01.1991) A weft braking and tensioning device according to claim 4, characterized in that the yarn storage (11) EN 204107 20 the lid (22) is fitted to the base plate (23) by means of pins (9,10) and there is a gap (12) along the entire cross-section between the lid (22) and the base plate (23). (Priority: 06/07/1988) 6. A4. Weft braking and tensioning device according to Claim 1 or 5, characterized in that the base plate (23) has permanent magnet inserts (24) and the permanent magnet inserts (24) in an opposite position in the cover (22) for adjusting the gap (12), screws (20) located in threaded inserts (25). (Priority: 06/07/1988) 7. A4. A weft braking and tensioning device according to any one of claims 1 to 5 or 5, characterized in that it has a brake plate (31) with an adapter tip (35), a braking gap (37) between the brake plate (31) and the cover (22). opposite the adapter tip (35) There is a screw (32) for adjusting the size of the braking slot (37) in a 6-threaded intermediate piece (34), the screw (32) and the insert tip (35) being interposed between the screws (33). (Priority: 30.01.1991) 8. Weft braking and tensioning device according to any one of claims 1 to 3, characterized in that the cover (22) and the base plate (23) of the yarn storage (11) are made of transparent plastic. (Priority: 06/07/1988)