CS243464B2 - Auxiliary blast nozzle for weaving machine's shed with air jet - Google Patents

Abstract

The auxiliary blowing nozzle (4) possesses an upper roof-shaped end (8) with a more or less sharpened edge (9). In the position (4a) in which the nozzle (4) is located directly before entry into the warp threads (17) occupying the bottom-shed position, this edge (9) is set approximately parallel to the bottom-shed warp threads (17). The angle (A2) between the edge (9) and the shed mid-plane (26) is preferably somewhat larger than the angle (A1) between the warp threads (17) occupying the bottom-shed position and the shed mid-plane (26). This ensures that, during the entry of the nozzle (4), the bottom-shed warp threads (17) are brought successively at a greater distance from one another, instead of being flung apart from one another abruptly. Damage to or breaks of the warp threads are thereby largely avoided. <IMAGE>

Description

(54) Auxiliary blowing nozzle for blowing through the air jet loom

With the nozzle for the shed of an air jet loom, it has a hoxmO, double-sided, spiked end (¢ 1) with a sharpened edge (9) that extends transversely to the picking direction. right before running into the yarn (17) standing in the shed position.

approximately parallel to the warp threads (17) of the lower shed · coal. The A2 between the edge (9) and the center plane (26) of the shed is preferably somewhat larger than the angle A1 between the warp threads (17) that are in the lower shed and between the center plane (26) of the shed. it is achieved that the warp threads (1st> lower shed during penetration of the nozzle (4) is progressively brought into mutual VSTS vzdálennasi _y town to be apart abruptly odmrtovdny · penetratingly This prevents damage or re markets osnovnícj_ thread.

243464 2

The invention relates to an auxiliary blowing nozzle for shed through an air jet loom.

The prior art nozzle of this kind according to DOS No. 2,145,256 receives a rounded tube from which air can enter through the side bore of the weaving machine. The tubular nozzle is generally guided obliquely to its longitudinal axis against the warp threads that are in the shed position. Particularly at high speeds, it may happen that the warp threads are not distributed precisely enough by the introduced nozzle, whereby the thread may be damaged or torn, or split.

The invention is based on the task of providing an auxiliary blowing nozzle improved particularly in this direction.

The invention is based on the fact that the free end of the nozzle extending between the warp threads is formed on both sides with a canopy and has a sharpened edge which extends transversely to the picking direction.

According to a preferred embodiment of the invention, the edge of the nozzle end is inclined relative to the longitudinal oee of the nozzle.

According to a further embodiment of the invention, a petition is positioned beneath the canopy end of the nozzle, which is eccentric to this nozzle end and comprises an air supply duct.

According to another embodiment of the invention, the air inlet duct has a riser section running parallel to the petition and an air outlet section arranged transversely thereto.

The cross section of the riser section is preferably larger than the cross section of the air outlet section, so that a throttling effect is produced therein.

As a result, an auxiliary blower nozzle with a more or less sharp upper edge can be introduced between the warp threads, through which the warp bits gradually expand in accordance with the bevel of the nozzle tip. Thus, the warp threads are pushed apart or split apart not suddenly but gradually. The auxiliary blowing nozzle according to the invention can operate xfree and without damage to the warp threads.

The auxiliary blowing nozzle according to the invention is shown in the drawings in which, in an exemplary embodiment, FIG. 1 is a cross-sectional view of parts of a loom, FIG. 2 shows a detail of FIG. Fig. 6 is a cross-sectional view of the side, Fig. 7 is a corresponding top view; Fig. 8 is a cross-section along the line VXIX-VXXX in Fig. 5.

The spar 2 reversibly pivoted along the arrow 1 during weaving operation carries a beam J, several auxiliary grinding nozzles 4 and several guide plates Z forming the guide channel 2 for the weft threads to be inserted. The nozzle 6 has a roof-like upper end 6 &apos; with a more or less sharpened edge 2 (FIGS. 2, 3). Air is supplied to the blower nozzle 6 through the hose Ц and the inlet duct 12 in accordance with the control program. The duct 12 consists of a rising section 11, cross-section C, which is eccentrically disposed in the region of the nozzle 5, as seen in particular in FIG. 4. substantially horizontal and has a smaller cross-section D than the blanket 13. By reducing the cross-section in the outlet section 15, a flow restrictor can be achieved therein. The air exits through opening 16 into the guide channel £ P ^ro thread, whereby the weft is carried proělupem £ 19 formed by warp · riveting mu ££ J · edge extends substantially parallel warp threads and 18th

During weft picking, the spar 6 with the spoke 6, the blower nozzle 6 and the slats 2 carried therein in the active position shown in solid line in Fig. 1. The blower nozzle 6 and guide slats 2 are introduced into the shed 12 by warp yarns 12. lower shed. After the weft has been completely clogged, the jet nozzle 6 and the guide plate 2 are swiveled according to the arrow 21 in FIG. 1 counterclockwise, since the nozzle 6 and the guide plate 2 move into an ineffective, not shown position outside the shed 12. the weft thread 2 in place of the fabric puller 25 ·

Before further weft insertion, the jet D, the blower nozzle 6 and the guide plates 2 are again swiveled in a clockwise fashion. In this case, they pass through the position ftf, & &, shown in dotted lines in FIG. 1, in which the upper edge 2 of the hood end £ of the blower nozzle stojí faces the central plane 26 of the shed 12 at an angle ,2 which is somewhat larger than the angle AI. Thus, the edge 2 of the subsequent movement, starting from the end or the corner 20, passes through the warp threads 12 at an acute angle B, i.e. obliquely, and these threads are gradually divided by the edge 2.

Thereafter, the blower nozzle 6, the jet 6 and the guide plates 2 are brought to a position, which is shown in solid line in FIG. 1, in which another weft thread 2 can be clogged.

By inserting the horizontal air outlet section 15 between the riser section 13 of the duct 12 and the outlet opening 12, it is ensured that the air vortices resulting from the bending or the air flow are paralleled again at the bent position 2Z ^and that before the air exits from the hole 16 of the air jet 2z · yo ⁸ greatest extent stripped viruses, so long can separately retain the direction seen in FIG. 4 and extending obliquely k.útkové thread 6 · This can increase the directionally oriented bearing effect as regards o weft thread 2 ·

In the modified embodiment according to FIGS. 5 to 8, the auxiliary blowing nozzle 4a comprises a shaft 4b with an oval cross section.

As a result, the sliding surfaces which the blowing nozzle 8 adjusts with the warp threads 12 can be extended, thus resulting in gentle handling of the warp threads during the introduction and removal of the grinding nozzle.

The angles A1 and A2 may also be equally large, so that the edge 2 stands parallel to the plane 17 of the warp threads.

In another embodiment, the edge 26 shown in dashed lines in FIG. 2 is slightly curved, for example, towards the end lying in FIG. 2 on the right. Other embodiments are obtained when the roof end 8 has, for example, vertically in the direction 3 shows the camber of the dashed-on roof surface 8a, 8b or the horizontal camber surface 8c of FIG. 8.

Claims (5)

SUBJECT OF THE INVENTION Auxiliary blowing nozzle for shedding of an air jet loom, characterized in that the free end (8) of the nozzle (4) extending between the warp threads (17) is sprayed on both sides and has a sharpened edge (9) which extends across to the pick direction. An auxiliary blowing nozzle according to claim 1, characterized in that the edge (9) of the nozzle end (8) is inclined relative to the longitudinal axis of the nozzle (4). 3. Auxiliary blower nozzle according to claim 1 or 2, characterized in that a base (14) is located below the spray tip (8) of the nozzle (4) and is eccentric to this nozzle end (8) and comprises air inlet duct (12). 4. Auxiliary nozzle according to any one of the preceding claims, characterized in that the air inlet duct (12) has a rising section (13) running parallel to the petition (14) and an air outlet section (15), which is set transversely to it. 5. by air, The auxiliary nozzle according to any of the preceding points, the extruding cross section (C) of the riser section (13) is larger than the cross section (D) of the outlet section (15) so as to produce a throttling effect.