SU1575947A3 - Device for laying weft thread on loom with microguides - Google Patents

Abstract

To increase performance, operating reliability and fabric quality in projectile weaving machines, the projectile opener with associated projectiles has a spring element (20, 21, 22, 23) which is located between the opener part (18) and mounting part (19) and which, during the opening of the projectile, allows an elastic displacement and/or rotation of the opener part in relation to the mounting part. As a result, fluctuations in position of the projectile are compensated and frictional loads and wear are reduced considerably. The coordinated contact faces (28, 29, 33, 34) of the opener part and of the projectile clamp result in surface contact during the opening operation. They can be made flat and wedge-shaped. Oil-free operation can be achieved in the case of plastic projectiles by means of an opener part made from abrasion-proof impact-resistant plastic. <IMAGE>

Description

The invention relates to textile engineering and can be used on microwebing weaving machines.

The purpose of the invention is to reduce wear and increase reliability by accurately positioning the micro-pliers.

Fig. 1 shows a device for laying a weft yarn with microplotter breakers on the insertion side of the weft yarn and on the catch side; Figures 2 and 3 are the breaker of the microprojector with corresponding microprocessors on the insertion side of the weft yarn and on the trap

to the side, in FIG. 4, a breaker with a flat spring and a cushion plate; FIGS. 5-7, a micro-laying breaker with flat, wedge-shaped contact surfaces and a spring element of circular cross section, view in the X, Y and Z directions (Fig. 7 shows the section A-A in Fig. 5); Fig. 8 shows a breaker with a flat spring element; Fig. 9 shows a breaker with a spring element made entirely of plastic in Figures 10 and 11 a breaker with screw-shaped contact surfaces; Fig "12 - plotter, the cut, and the details of the breaker

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a micro layinger with arcuate contact surfaces and a spring element of circular cross section.

The weft thread 1 is received by the micro plotter 2 in the weft-combat box 3 with acceleration, obtained by means of the combat arm 4, is transferred through the jawl 5 in the direction of the weft threads X. 8, and is thrown back by the return pusher 9 to a precisely defined position 10. Here, the microprojector breaker on the catching side 11 is to be released by unlocking the microplotter 12 by the end of the thread remaining after trimming thread. After that, the microprojector by the same breaker of the microprojector 11 with the raised catching brake 7 is shifted into the channel 13 for ejection. With the help of the reverse transport device 14, micro-laying device 2 again gets into the weft-combat box 3. At position 15, the micro-laying device is held by lever 16. The opening of the micro-laying device 17 on the insertion side of the weft yarn opens the micro-laying clip-Kg 12 and simultaneously extends: X, Then the lever 16 and the revolving around the axis 18 the breaker 17 move together upward and the MUK-plyplochchik with the decompressed clip is led to the throwing position, where the refined thread is transferred to the microplayer from the thread givers (not shown). In this case, the breaker 17 turns back and thus closes the microlocker clamp. In order to achieve error-free threading and reliable throwing, the microprojector should also position the breaker precisely. In this example, the circuit breaker 17 on the weft side of the weft thread acts on the clip at the through hole 19, and the breaker on the catching side 11 is in a different place at the end opening of the box. In other examples, both the breaker 17 and 11 can act on the same clamping point of the microprojector, This is also valid for breakers in which a flat wound element is installed on the input side of the weft thread between the disconnecting element 20 and the 2G holder part 22, while u opened

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the microplayer on the catching side is a spring of circular section 23 (FIGS. 2 and 3). These spring elements 22 and 23 provide elastic displacement or turning of the disconnecting part in relation to the detzpi holder to compensate for non-optimal geometric ratios of the contacts.

Fig. 4 shows a micro breaker breaker on the input side of a weft yarn with a flat spring 22. Additionally, a cushioning plate made of elastomer 24 is inserted here, which allows for very limited elasticity in the opening direction mainly to remove peak loads. The spring stiffness in the Z direction is many times greater than in the transverse Y direction.

Figures 5-7 show, in directions X, Y and Z, a micro-laying breaker with flat, wedge-shaped contact surfaces and a spring element of circular section 23 and microchunks with a housing 25, a through hole 19 and a clip 12. As can be seen from FIG. 5 , the contact surfaces 26 of the disconnecting element 20 and the contact surfaces 27 of the clamp are substantially flat and wedge-shaped in order to achieve the greatest possible planar contact when opening and positioning the clamp in the transverse direction Y. Since it is usually a microprojector after each weft insert turns 180, the contact surfaces 27 of the clip are symmetrical. They are also made slightly convex in order to ensure the greatest possible flat contact also with changes in angles during twisting; the blueing of the disconnecting part. Thus, the contact surfaces are only approximately flat. In Fig. 6, similarly to this, approximately flat contact surfaces 28 of the opening element 20 are shown, which act on the respective contact surfaces. 29 of the housing 25 (or also the i-clamps of the microprojector), aligning the microprojector in the direction of the weft threads X. The spring element 23 has an oval-elliptical cross section, so that the spring stiffness in the X direction is greater than in the Y direction. Thus, centering in the direction of X acts accordingly stronger. Even a small

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turning the axis of the microprojector X at a small angle 5 from the direction of the weft yarn X can be caught, respectively, compensated by the spring element 23. In this case, it acts as a torsion spring. In this example, the breaker on the input side of the weft yarn and on the catching side acts on the same clamping point of the microprojector.

Fig. 8 shows a breaker with a corresponding microprojector 2 similarly to the example in Fig. 5, but with a flat spring element 22. At the same time, the flat spring can be made, for example, of steel and connected to a plastic disconnect element or spring element 30 and the disconnecting element 20 can be made solid. In this case, the spring action of the element 30 is achieved by shaping.

FIG. Figure 9 shows a spring-loaded element made of plastic. In this case, section 30 is spring-loaded, and the disconnecting element 20 is made of wear-resistant, impact-resistant plastic, for example, polyamide containing glass granules.

Figures 10 and 11 show a breaker with helical contact surfaces, taking into account the change in angle θ between the jaws of the clamp when the clamp is opened. The upper cross-sectional area 31 of the disconnecting element is generally rectangular (the microplayer clamp is still closed), while the lower trapezoidal cross-sectional area 32 of the opening angle S corresponds to an open clamp. The contact surfaces are made convex and, therefore, no / exact cylindrical sweeps.

Fig. 12 shows the arcuate contact surfaces 33 of the metal clamp of the micro-stacker for centering in the X and Y direction with the spring element 23 of circular section and the plastic disconnecting element 20. In this case, the case of the micro-layer 25 made of plastic does not touch.

The proposed device works as well as the known.

Thanks to the spring version, the offered breaker is clear. 5 m

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use in a wide range of non-optimal geometrical ratios. This facilitates adjustment and permits higher wear tolerances. Due to contact on a large surface, when opened, wear is reduced and service life is significantly increased, as well as operational reliability. This makes it possible to use also plastic damping parts for the desired non-mating operation. Finally, the spectrum of the processed yarn is also expanded on a loom.

Claims (9)

1. A device for laying a weft yarn on a micro-loom loom, comprising micro-pavers with a weft-clamp and a clamp-breaker, including a wedge-breaking element and its holder, the breaking element and the micro-stitch clamp having contact surfaces for interaction during the clamp-unlocking process weft thread, which is due to the fact that, in order to reduce wear and increase operational reliability by accurately positioning the micro-plowers, between the breaks The coping and its holder dispose a spring element for elastic displacement and / or turning of the disconnecting element relative to the holder when the weft clamp is opened. 2. Device pop.1, which differs from the fact that the contact surfaces of the disconnecting element of the breaker and the clamp of the micro-patcher are matched with each other with the lattice contacting. 3. The device according to claim 2, wherein the contact surfaces of the disconnecting element and the weft yarn clamp are generally flat and wedge-shaped. 4. A device according to claim 3, characterized in that the flat and wedge-shaped contact surfaces of the disconnecting element and the clamp of the weft yarn are arranged in the transverse and longitudinal directions relative to the trajectory of the weft yarn. 5. The device according to claim 2, which is based on the fact that contact the surfaces of the disconnecting element and clamp are screw-shaped " 6. A device according to claim 1, characterized in that the disconnecting element is made of wear-resistant, impact-resistant plastics 7. The device according to claim 1, which is based on the fact that the springs - the dead element is designed as a flat spring. 8. The device according to claim 1, wherein the spring element is designed as a spring with a round or oval cross section. 9. A device according to claim 1, characterized in that the stiffness of the spring element in the direction of movement of the opening element is at least twice the stiffness in directions that are transverse to the movement of the opening element. sixteen 2 /four. 1 Fig.Z 21 25 12 29 19 Have - fie Fig 5 / 29 25 Fig 6 X. ) thirty 31 22 FIG. 9 -20 FIG. W FIG. eleven at P