GB2097828A

GB2097828A - Weft inserting channel in jet weaving machines

Info

Publication number: GB2097828A
Application number: GB8212303A
Authority: GB
Original assignee: ZVS VYZKUMNEVYVOJOVY USTAV KONCERNOVA UCELOVA ORGANIZACE
Current assignee: ZVS VYZKUMNEVYVOJOVY USTAV KONCERNOVA UCELOVA ORGANIZACE
Priority date: 1981-04-30
Filing date: 1982-04-28
Publication date: 1982-11-10
Also published as: DE3205644A1; GB2097828B; FR2504946B1; CS235259B1; JPS57191350A; ES277878U; IT8219581A0; ES277878Y; DE3205644C2; IT1149607B; FR2504946A1

Abstract

In a jet loom guide channel (6) is arranged at least one active member (5) on at least one side of the axis (3) of the path of the weft to be inserted, the active member being provided with at least two discharge openings directed in the direction of weft insertion in the weft inserting channel space, the axes of at least two discharge openings (9, 10, 11) of one active member form different mutually parallel planes ( alpha , beta , gamma ) of which each is parallel to the axis of the path of weft to be inserted and pass through the respective discharge opening. <IMAGE>

Description

SPECIFICATION Weft inserting channel in jet weaving machines The present invention relates to a weft inserting channel in jet weaving machines for inserting weft through the shed by means of a carrying fluid jet.

The known pneumatic jet weaving machines, in which weft insertion is performed by an air jet escaping from the main nozzle, are usually provided with a weft inserting channel formed by a system of flat guiding elements in which open weft inserting profiles are formed, which are coaxially arranged along the weft inserting length.

Usually, the guiding elements have the form of flat plates, which are provided with conical throughopenings for concentric direction of the inserting fluid jet and with slots for removing the weft yarn to be inserted. In other known pneumatic jet weaving machines, the guiding elements are formed by reed dents, which are provided with an open weft inserting profile forming at least one part of the weft inserting channel wall.

As the speed of the main inserting air jet is considerably reduced by increasing the weft yarn length to be inserted in one pick, active elements are arranged along the path of weft to be inserted, in the weft inserting channel. The said active elements are connected to an inserting fluid source and are provided with ejecting openings which are directed with their orifices in the direction of weft insertion. Their shape is usually the same as the shape of a guiding element of the weft inserting channel. Active elements made in the form of a longitudinal cylinder with a pointshaped end are also known. Each active element is provided with a channel with at least one discharge opening. The channel of the active element is connected to an inserting fluid source, which escapes upon weft insertion through the discharge opening which is directed in the direction of weft insertion.The inserting fluid jets from the discharge openings of the active elements complement and influence the main inserting fluid jet. The discharge openings in the active elements of the weft inserting channel are arranged also in groups, of which the axes usually intersect the axis of the inserted weft at one or several points.

The known constructions of the weft inserting channel as specified above do not secure in practice a reliable weft insertion to a sufficient extent from the viewpoint of economic use of the inserting fluid energy, thus limiting the working width of the weaving machine.

According to the present invention there is provided a weft inserting channel for a jet weaving machine for inserting weft through the shed by means of a carrying fluid jet, including an array of weft guiding elements with a weft insertion space therebetween, at least one of the elements being an active member at least at one side of the weft path axis, the or each active member being connected to a source of carrying fluid and provided with at least two fluid discharge openings being formed as ducts with a circular cross-section directed in the direction of weft insertion into the insertion space wherein the axes of at least two discharge openings of one active member lie in different mutually parallel planes passing through respective discharge openings, each of which planes is parallel to the weft path axis.

The main advantage of the weft inserting channel according to the present invention consists namely in increasing the reliability of the weft insertion through the shed, i.e. before all in reducing short picks and other weaving faults in the fabric. The weaving process is more continuous and more productive, because the energy of the inserting fluid is also better used.

Embodiments of the present invention in form of preferred examples are shown in the accompanying drawings, in which: Fig. 1 represents a view of a first embodiment of the invention showing a weft inserting channel in the direction of weft insertion; Fig. 2 is a longitudinal front cross-section through a part of the weft inserting channel as shown in Fig. 1; Fig. 3 is a longitudinal cross section from above through a part of the weft inserting channel as shown in Fig. 1; Fig. 4 is a view of a second embodiment of a weft inserting channel according to the invention in the direction of weft insertion; Fig. 5 is a longitudinal cross-section from above through a part of the weft inserting channel as shown in Fig. 4:: Fig. 6 is a view of a third embodiment of a weft inserting channel according to the invention in the direction of weft insertion; Fig. 7 is a view of a fourth embodiment of a weft inserting channel according to the invention in the direction of weft insertion, Fig. 8 is a longitudinal front cross-section through a part of the weft inserting channel as shown in Fig. 7; Fig. 9 is a longitudinal cross-section from above through a part of the weft inserting channel as shown in Fig. 7; and Fig. 10 is a longitudinal cross-section of a fifth embodiment of a weft inserting channel as seen from above according to the invention incorporating features shown in the embodiments shown in Figs. 7 and 5.

As shown in the accompanying drawings in Figs. 1 to 5 and 7 to 10, at least one active member 5 is arranged on the batten 1 of a nearer not represented pneumatic jet weaving machine, together with the reed 2 along one side of axis 3 of the path of weft 4 to be inserted. In accordance with the working width of the machine, there can be even more active members 5 forming part of the weft inserting channel. Together with said active members 5, a system of weft guiding elements 6 forms advantageously the weft inserting channel.

Each guiding element 6 is provided with a conical through opening 7 for concentric directing of the inserting fluid jet, and an aperture 8 for removing the weft 4 to be inserted. The weft guiding elements 6 direct the main inserting fluid jet which is discharged at the moment of insertion from the main nozzle (not represented) in the direction of inserting weft 4, as well as the additional inserting fluid jets from the discharge openings 9, 10, 11 of active members 5, made here e.g. in the form of upwardly pointed rods. The discharge openings 9, 10, 11 are connected to channel 12 formed in active element 5, which in turn is connected to the nearer not represented inserting fluid source.On each active member 5, at least two discharge openings are provided, for example, openings 9, 10, 11. At least two axes of the axes 13, 14, 1 5 of discharge openings 9, 10, 11 of active member 5 form part of different, mutually parallel planes a, , y which are parallel to the axis 3 of the path of weft 4 to be inserted, and pass through the respective discharge openings 9, 10, 11. On the active element 5, the discharge openings 9, 10, 11 are situated at least in one row above each other. According to Figs. 4, 5 and 10, however, the discharge openings 9, 10, 11,16,17and18,19,20,21,22canbe arranged also in two or more rows above each other.It is suitable, when the axes 13, 14, 1 5 of at least two discharge openings 9, 10, 11 of one row are at least two mutually parallel and are situated in a plane T transversal to planes a, , y. However, the said transversal plane T makes with the axis of path 3 of weft 4 to be inserted an angle 'Y which is between 0 45 , and preferably 10 .

When the active member 5 is provided with two rows of discharge openings 9, 10, 11, 16, 17 and 1 8 to 22 (see Fig. 5) their transversal planes T and T' may intersect and make with the axis 3 of the path for weft 4 to be inserted different angles 'Y and 'Y' where v = 30 and ' = 10 .

In an alternative embodiment in form of example of the weft inserting channel as shown in Fig. 6, two active members 5 and 5' are arranged oppositely at both sides of axis 3 of weft 4 to be inserted, the planes a, p and a', P' of axes 13, 14, and 13', 14' of their discharge openings 9, 10 and 9', 10' are made parallel. However, they can be made even in such manner, that planes cr, ' and p. B' are on the opposite members 5 and 5' and intersect.Then the intersecting lines of plane a, a' and p, ' can be either parallel to axis 3 of weft 4 to be inserted, or make an acute angle, preferably 5 , therewith.

As far as the actual embodiment of active member 5 is concerned, it is represented in the drawings in the form of a bar. However, in certain cases it might be advantageous to use a shape closely resembling that of the weft guiding elements 6.

However, it is advantageous in both cases, when the size of the passage section of channel 12 of active member 5 at one discharge opening, e.g. 9 differs from the passage section of channel 12 of the same active member 5 at a further discharge opening, e.g. 10. For the purpose of forming an optimum speed zone for the carrying fluid jet in the weft inserting channel, it is usually suitable, when the size of the passage sections of channels 12 of active member 5 at its discharge openings 9, 10, 11 is diminished in the direction of supplying the carrying fluid.

This can be advantageously achieved by easy manufacture in such manner, that the outer cross section of active member 5 in the section of discharge opening e.g. 9 is of non-circular shape, e.g. oval. An oval cross section can be easily obtained by compressing an originally circular cross section of active member 5. Then, it is also advantageous when in an active member 5 of such shape the axes 13, 14 and 15 of its discharge openings 9, 10, 11 are directed vertically to its surface at the point of exit of said discharge openings 9, 10, 11.

In certain cases, it might be suitable when the passage section of at least the last discharge opening 9 in the direction of carrying fluid supply coincides with the passage section of channel 12 in active member 5 at the point of the said discharge opening 9.

However, it is advantageous in all specified cases, when the passage section of discharge openings 9, 10, 11 etc., is diminished in the direction of discharge of the carrying fluid.

It is obvious, that along the path of the weft to be inserted, i.e. along the weft inserting channel, a plurality of active members 5 is arranged, the mutual distances between which can diminish in the direction of weft insertion.

The present invention is suitably applied to weft inserting channels for pneumatic weaving machines having a large working width.

Claims

1. A weft inserting channel for a jet weaving machine for inserting weft through the shed by means of a carrying fluid jet, including an array of weft guiding elements with a weft insertion space therebetween, at least one of the elements being an active member at least at one side of the weft path axis, the or each active member being connected to a source of carrying fluid and provided with at least two fluid discharge openings being formed as ducts with a circular cross-section directed in the direction of weft insertion into the insertion space wherein the axes of at least two discharge openings of one active member lie in different mutually parallel planes passing through respective discharge openings, each of which planes is parallel to the weft path axis.

2. A weft inserting channel as claimed in Claim 1, wherein the discharge openings of the or each active member are arranged at least in one row above each other.

3. A weft inserting channel as claimed in Claim 2, wherein the or each active member have at least four discharge openings which are arranged in two rows.

4. A weft inserting channel as claimed in Claim 3, wherein the axes of at least two discharge openings of one row of an active member are mutually parallel and are situated in plane which is transversal to planes of axes of the said discharge openings which are parallel with axis of the path of weft to be inserted, said transversal plane being angled to the weft path axis at an angle of between 0 and 450.

5. A weft inserting channel as claimed in Claim 4, wherein the transversal planes of at least two rows of discharge openings of active member are angled to the weft path axis at different angles.

6. A weft inserting channel as claimed in Claims 1 to 5 wherein at least two active members are arranged mutually oppositely at both sides of the weft path axis, the planes of the axes of their respective discharge openings being mutually parallel.

7. A weft inserting channel as claimed in Claims 1 to 5 wherein at least two active members are arranged mutually oppositely at both sides of the weft path axis, the planes of the axes of their opposite openings intersecting.

8. A weft inserting channel as claimed in Claim 7, wherein the intersecting lines of the planes of the axes of the discharge openings of the oppositely arranged active members are arranged to be parallel to the weft path axis.

9. A weft inserting channel as claimed in Claim 7, wherein the intersecting lines of the planes of the axes of the discharge openings of the oppositely arranged active members make an acute angle with the weft path axis.

1 0. A weft inserting channel as claimed in Claims 2 to 9 wherein the size of the internal passage section of the feed channel within the or each active member as it meets one discharge opening differs from the size of the internal passage section of channel of the same active member as it meets its further discharge opening.

11. A weft inserting channel as claimed in Claim 10, wherein the size of the internal passage section of the feed channel within the or each active member as it meets the discharge openings diminishes in the direction of flow of the carrying fluid supply.

12. A weft inserting channel as claimed in Claims 1 to 11, wherein the outer cross section of the or each active member at least at one discharge opening is of a non-circular and preferably an oval shape.

13. A weft inserting channel as claimed in Claim 12, wherein the axis of a said discharge opening is perpendicular to the exterior surface of its active member at the outlet of said discharge opening.

14. A weft inserting channel as claimed in Claims 11, 12, wherein the internal feed channel cross-section for at least the last discharge opening of the or each active member in the direction of the carrying fluid supply is of the same size as the internal cross-section of that discharge opening duct at the meeting point of the feed channel and duct.

1 5. A weft inserting channel as claimed in Claims 1 to 12, wherein the cross-section of the discharge opening ducts is diminished in the direction of outlet of the carrying fluid.

1 6. A weft inserting channel substantially as described with reference to Figures 1 to 3 of the accompanying drawings.

1 7. A weft inserting channel substantially as described with reference to Figures 4 and 5 of the accompanying drawings.

1 8. A weft inserting channel substantially as described with reference to Figure 6 of the accompanying drawings.

1 9. A weft inserting channel substantially as described with reference to Figures 7 to 9 of the accompanying drawings.

20. A weft inserting channel substantially as described with reference to Figure 10 of the accompanying drawings.