CZ269095A3 - Open weft picking channel - Google Patents

Abstract

An open weft picking channel (13) with a varying cross section made by profile dents (2) of beat-up reed (1) of a pneumatic weaving machine with built-in auxiliary jets (8) whose outlet apertures (14) reach into the width of the weft picking channel (13) and in which at least a part of the weft picking channel (13) has a constant profile. The outlet apertures of the picking medium of the auxiliary jets (8) are situated under the lower outline of the constant profile of the weft picking channel (13).

Description

Open weft picking channel

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The invention relates to an open weft picking channel formed by profiled cane beams of an air weaving machine with built-in, blowing nozzles, whose outlet openings extend to the width of the picking channel, at least a portion of the picking channel length having a constant profile.

BACKGROUND OF THE INVENTION

In air weaving machines, the weft into the shed of warp threads is clogged by the main nozzle located on its inlet side. In the shed, the weft is guided through a picking channel, which is either formed by the confusor slats or by the profile cane of the stroke beam. In modern high-speed weaving machines, the blowing nozzles are located in the length of the picking channel acting on the front of the weft to be picked. The profiled cane beams are provided with a pair of projections forming a bounded picking channel that is open towards the fabric being formed.

An open weft channel formed by profiled cane beams is known, for example, from CS Patent No. 219 281, where the cane is in several shape modifications. In the projection area of the blow nozzles, the profile cane is replaced by differently shaped cane with only the upper projection and the pick channel is limited at this point by only two

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October 11, 1995 by the upper side and the rear punch side. Alternatively, they are replaced only by straight cane punches.

According to a further alternative solution, the profile beam has an open picking channel, at the point of projection of the blowing nozzles is located an alternately straight cane, a cane, and a canal inherently has a constant. only in the area of the blowing nozzles, the lower or even the upper side formed by the beam cane is omitted.

The disadvantage of this solution, however, is that the blowing nozzles are located at a relatively large distance from the picking channel, which results in a low efficiency of the picking system and at the same time a higher consumption of picking medium.

..... .............Further is. known solution, according to-DE patent No. 3.740.-666, where-on-the-side-of-the-short-section-swap-channel-conical-tapered shape Furthermore, it has a parallel shape over its entire length. This profile cane treatment is adapted to the main insertion device. This consists of two main jets placed one above the other and allows weft mixing or color change. Since the inlet axis of the insertion weft is variable here, the picking channel on the inlet side has a funnel-like extension for guiding the individual wefts into a parallel working part.

Said solution relates to a structure of main nozzles, which improves the picking medium inlet into the pick channel, the auxiliary jets are again positioned at a large distance from the picking 'i _R channels, causing drawbacks similar to the previous solution.

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Another known solution of the picking channel of a jet loom is known from CS AO No. 219 512, wherein the top and rear walls of the picking channel are formed by profiled canes with upper nose-like projections. The lower part of the wall of the picking channel is formed by a blower body with blower nozzles, where warp threads of the lower shed branch are laid on the back surface of the blower body. This dorsal surface has a sawtooth shape, with the nozzles facing the faces of the sawtooth protrusions. The top wall of the picking channel, formed by the projections of the beam cane, is parallel to the direction of the picking weft.

Alternatively, the body block with the blowing nozzles at the locations of the sawtooth protrusions may have a differently shaped upper side.

This solution presents some problems in terms of air flow through the sweep channel, the bottom side of which is full, and the others are formed by alternating canes and gaps between them.

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In the embodiment according to the description of the invention AO No.210296, this block with the blowing nozzles is also displaceably arranged relative to the cane projections by means of an eccentric mechanism. This causes the picking channel to be closed at the moment of weft picking.

The disadvantage of this solution is that the lower passage is switched, which increases the risk, especially in the regions, of threading the warp thread. The homi-shed-to-pick recess-slats. Furthermore, the yarn remains in the picking channel, which has an adverse effect on the picking medium, especially for thicker yarns. The yarn in the picking channel is not only directly exposed to air pressure, but also increased abrasion by the bottom of the channel.

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11.10.1995

Another known embodiment according to CS patent no. 198 232 has a modified beam for better knocking of the weft to the fabric binding point of the fabric so that the cane and protrusions forming the picking channel have straight cane at the expansions and then profile or regular profile. ^^^ - ^^^^ cane ^ ^ independently naTjmístěni auxiliary ČH tiýsékT ^ ^ "^^ ^ ^ ^{=== 7} '

- With this solution is ^; Necessary constructional adjustment of retractable insertion nozzles and range suction. a nozzle that is difficult to implement if the yarn color changes. The blowing nozzles are located a long distance from the picking channel, which results in low picking efficiency

........ ‘system and at the same time higher consumption of picking media.

The last known embodiment of US Patent No. 5,323,814 has tapered walls on the walls of the beam-shaped members of the pick-up channel to direct the stream of air to the stream. center - pass-escape. The bevel is at least part of the thickness of each cane, the shape of the picking channel remaining constant and parallel to the weft to be picked.

This solution has the disadvantage common to most of these solutions that the blowing nozzles are located at a greater distance from the picking channel, which results in lower efficiency of the picking system acting on the front of the picked weft, i.e. the risk of poor weft picking. at the same time, this placement causes higher consumption of picking media.

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SUMMARY OF THE INVENTION

These drawbacks are largely eliminated by the open weft picking channel with variable cross-section according to the invention, which is characterized in that the rod inflating nozzles have the exit openings of the insertion medium located below the lower contour of the constant picking channel profile.

An advantage of the embodiment of the open weft picking channel according to the invention is the possibility to substantially increase the dynamic pressure of the picking medium at the presumed weft flight location without increasing the pressure of the medium in the blowing nozzles.

It is advantageous if more than one cane following the weft picking direction after the nozzle has a lower contour of the picking channel below the level of the outlet nozzle of the puffing nozzle, thereby ensuring a better passage of air flow into the active part of the picking channel and picking channel when the weft is carried by the shed.

The profile cane behind the jetting nozzle then has a lower pick channel contour tapering in the weft picking direction towards a constant pick channel profile, which further improves the air flow from the pick nozzles through the pick channel.

In the region of the tapered profile of the picking channel according to the previous embodiment, it is advantageous if the profile cane have lower edges tapered into a single inclined plane converging towards a constant profile , This chamfer of the lower edges ensures a smooth flow of the pick

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11.10.1995 media picking channel.

For reliable insertion of the weft into the shed, it is advantageous if the profile cane has a constant profile at least one third of the length between the two blowing nozzles.

The advantage of the open picking weft channel according to the invention is a reduction in the consumption of the picking medium and, at the same time, an increase in the reliability and speed of the weaving. By directing the blowing nozzles more towards the weft picking direction, which is determined by the shape of the picking channel and the actual location of the blowing nozzles, the flow of the picking medium is also uniform. Furthermore, the weight of the bidlen is reduced and its inertia is reduced.

List of figures in the drawing _________................. _ _, ____

The object of the invention is shown in the drawings, wherein in Figs. 1 and 2 there are two embodiments of a baffle with cross-sectional attachments in the weave of the weaving machine and alternatively attached blowing nozzles. Fig. 3 is a front view of the open weft picking channel of the present invention; and Figs. 4, 5, 6 and 7 show individual profile cane with different profiles forming a proportionally variable weft picking channel.

DETAILED DESCRIPTION OF THE INVENTION

The impact beam I with profile cane 2 is by means of a wedge 3

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11.10.1995 fastened in the wedge groove 4 of the batten 5. On the side of the fabric 6, the bodies 7 are fixed to the batten 5, in which the inflating nozzles 8 are fixedly fixed. The warp threads 9 are guided between the cane 2.

In the embodiment according to FIG. 2, the lower beam frame 1 is shaped and holes in its side wall are inserted with cylindrical bodies 7 with blowing nozzles 8 and secured by a screw H. The profile cane 2 is provided with a recess 12 with a recess to form the picking channel 11 In the impact beam 1 according to the invention, the profile cane 2 have different sizes of recesses, thus also changing the resulting contour of the picking channel 13 along the length of the stroke beam 1. The depth of the recesses of each cane 2 determines the width of the picking channel 13. the walls of the recesses forming the trailing edge of the beam 1 are flush. The upper edge of the recesses of each cane 2 is at the same height in the spoke 1 for all cane 2. The lower edges of the cane 2 forming the lower contour of the picking channel 13 are at the same height in front of each inflow nozzle 8 and form a constant picking channel profile 13 with the rear and top edges. between. At the point of insertion of the blower nozzle 8, the first cane 21 does not have a lower contour edge, the trailing edge being continuous up to the lower end of the first cane 21, thus creating space in the beam 1 for positioning the blower nozzle 8 to the width of the picking channel 13 . the auxiliary ^- 8 nozzles are 'celým'svým outline located under the lower outline of the constant profile of the weft picking channel 13 is.

After the nozzle 8 in the direction of weft picking 16, the second one i

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On October 11, 1995, the profile cane 22 has a lower edge forming the contour of the picking channel 13 below the level of the outlet opening 14 of the blow nozzle 8. Each subsequent third cane 23 has a lower edge upwards until they reach a lower contour of the picking channel 13. The lower edges of the third cane 23 may have a chamfer lying in one inclined plane converging from the other profile cane 22 towards the constant profile of the picking channel 13.

Since the upper edges of all the cane 2 are flush and the lower edges of the cane 2 behind the inflow nozzle 8 are still higher, they form the lower contour of the picking channel 13 tapering towards its constant profile. The infusion nozzles 8 are pressure hoses 15 in a known manner connected to a pressurized medium source (not shown).

During weaving, the weft 16 is inserted by a main picking nozzle (not shown) into a picking channel 13 of variable cross section formed by the profile canes 21, 22, 23 and 24. After being picked into the picking channel 13, the picking medium streams further of the weft 16 and guide it in the upper inner corner of the picking channel 13.

Bidlen 5, which performs a rocking movement on a weaving machine (not shown), carries both the jet 1 and the blowing nozzles 8. The weft 16 is clogged by the picking channel 13 at the time the healds 10 (not shown) form a shed 17 , 22, 23 and 24 according to the invention, by virtue of the outlets of the blowing nozzles 14 being arranged in the width of the picking channel 13, directing the streams of picking medium from

On October 11, 1995, these outlet openings 14 below the upper contour edge of the picking channel 13. By forming the bottom edge of the picking channel 13 in an inclined plane facing the constant profile of the picking channel 13 formed by the fourth profile cane 24, the picking medium is concentrated and thereby improved. exploiting its dynamic effect. The weft 16 is thus pulled by a constant force even at an increasing distance from the blow-off nozzle 8. The weft insertion is uniform and there are no micro-loops caused by uneven picking medium action over the picking channel 13. At the same time 18, forming the face of the fabric formed

6. After inserting the entire length of the weft 16, this weft 16 is punched by the trailing edge of the profile beam 1 at the binding point 18 and subsequently tied by the warp threads 9 guided in the heald eyes 10 fixed in the heald leaves (not shown). The canes 21, to which the blowing nozzles -8 are associated in the profile beam 1, then provide sufficient space for movement between the warp-guided weft 9 guided therethrough while the shed 17 &apos;

Claims (5)

An open weft picking channel of variable cross-section, formed by profiled cane beams of an air weaving machine with built-in blowing nozzles, whose outlet openings extend to the width of the picking channel and wherein at least part of the picking channel length has a constant profile. (8), the outlet openings, the insertion medium, are located below the bottom contour of the constant profile of the picking channel (13). An open weft picking channel according to claim 1, characterized in that at least one cane (2) following the weft picking direction (16) after the rod inflow nozzle (8) has a lower contour of the picking channel (13) below level of the outlet orifice (14) of the blower nozzle (o). __ An open weft picking channel according to claim 2, characterized in that the profile cane (2) downstream of the inflow nozzle (8) has a lower contour of the picking channel (13) tapering towards its constant profile. Open weft picking channel according to claim 3, characterized in that the profile cane (2) in the region of the tapered profile have lower edges beveled into one inclined plane converging in the weft picking direction (16) to a constant picking channel profile (13) . ·, ·: Ι. " Open weft picking channel according to claim 4, characterized in that the profile cane (2) with a constant picking channel profile (13) constitutes at least one third of the distance between two adjacent blower nozzles (8).