Technical Field

The invention relates to layout of multi-function filling nozzle for pneumatic filler of weft thread. The filling nozzle consists of a fixed and a movable part, where the fixed part is equipped with nozzles for filling the weft back to the fabric. The nozzles are connected to. air intake holes and a slot with connected nozzle, while the slot continues with a lead-in key for the weft lead-in.

State of the Art

The hitherto solution of the equipment for filling the weft of a weaving loom is solved by using additional mechanic or pneumatic weft fillers. The disadvantage of hitherto known mechanic weft filler is the large number of movable parts significantly reducing the speed of the weaving loom. Another disadvantage is the high operation temperature caused by a high number of mechanic components of the filler. More, it required regular set-up which is a necessary condition of its correct function. And an indispensable feature is also the frequent wear and tear of filler components and its frequent faults. Thanks to significant dimensions of the whole set of mechanic filler, the filler is not favourable for the machine operation due to difficult lead-in of warp ends to healds and the beam in the field of the spreader.

On the other hand, the advantage of pneumatic weft filler compared to mechanic filler is its simple solution, when a large number of mechanic parts is eliminated. The pneumatic weft filler can be used for high-speed machines, it has a considerate weft filling using the air pressure, as there is eliminated possible mechanical damage of the weft and the warp with the filling hook, which takes the weft back to the fabric in case of mechanic filler. The pneumatic filler of weft is of small dimensions and so it is suitable for the machine operation as it does not make an obstacle when filling the warp threads in the field of the spreader.

The way of filling the weft in both fillers is based on cutting the smashed weft approximately 12 - 15mm from the fabric edge and insertion of the weft end using a hook (in case of mechanic weft filler) or using the nozzle air pressure (in case of a pneumatic weft filler) back to shed consisting of warp threads, when the end of the weft is smashed to the fabric by consequent shot. In case of manufacturing a fabric with firm edge and total width of the edge of 5 mm (so called optic edge), the end of filled weft enters the fabric pattern in 7 - 10mm. In such a case, the filled weft doubles the texture of the fabric weft to approximately 12 - 5mm from the fabric edge, which negatively affects not only the looming on the machine, but also the consequent final refinement of the fabric. This is caused by the construction of mechanic as well as pneumatic versions of weft fillers, when the minimal length of cut end of the weft from the fabric is 12 -15mm. It is not possible to reduce the length of the cut weft end due to construction design of both filler types. The conditions are set by the construction of weft shears layout out of the filling nozzle, as can be seen in Fig. 3.

The ends of the weft intervening the pattern area of the fabric 12 - 15mm from the fabric edge cause development of double texture / slay of the weft, which causes:

• increased number of warp breaks 12 - 15mm from the fabric edge, which causes reduction of weaving loom productivity,

• disturbing appearance of the fabric pattern,

• corrugation of both edges of the fabric due to different tension of warp threads,

• difficult dying of the fabric due to double texture / slay of the weft in the pattern 12 - 15mm from the edge of the fabric.

Summary of the Invention

The aim of the invention is to design a new construction solution of the multifunction nozzle filling the weft using air pressure back to fabrics and it simultaneously works as the weft thread shears.

The above stated disadvantages of hitherto used weft fillers are eliminated by layout of the multi-function filling nozzle for pneumatic filler of the weft thread, which consists of the fixed part and the movable part, where the fixed part is equipped with nozzles for weft filling back to the fabric, connected to the air intake holes and a slot with connected nozzle, while the slot continues with a lead-in key, based on the fact that the fixed part on one of its sides is equipped with a fixed edge, which makes its integral part and simultaneously it makes a fixed part of the weft shears , while the movable part consists of a movable arm, holding a movable edge, representing the movable part of the weft shears.

The main advantage of the multi-function filling nozzle is based on the fact that it consists of the fixed part and the movable part when the fixed part is equipped with nozzles for filling the weft back to the fabric and it simultaneously makes the fixed part of the weft shears for cutting the weft with the movable arm with the shears edge, making the movable part of the nozzle. That means that this is a nozzle, which fills - using the air pressure - the weft back to fabric and simultaneously it serves as the weft thread shears. This design of multi-function nozzle construction allows reduction of the weft length filled back to the fabric to max. 4 - 5mm, when the end of the filled weft does not intervene to the fabric pattern and so it does not double the texture / slay of the weft in the pattern. The lead-in of the warp threads making the lead-in of the fabric edge can be simultaneously texture adjusted in such a way so as to avoid different tension of warp threads of the fabric pattern and the edge.

The advantages of the multi-function nozzle are as follows:

• possibility of use for all the types of pneumatic fillers,

• reduction of the length of filled end of weft, which does not intervene with the fabric pattern,

• weft material savings in approximately 16 - 20mm per each smashed weft,

• thanks to simplification of construction of the nozzle and weft shears it can be used also for high-speed machines with high reliability, when there are - simultaneously, using the air intake to filling nozzles - cooled down the edges of weft shears and these are independently cleaned from dust of weft material,

• thanks to the short end of the cut weft the weft is more precisely placed in the shed and so there is reduced the total time of cut and weft filling, while it is not necessary to brake and stabilise the weft before cutting,

• the multi-function nozzle requires minimal maintenance and setup, • due to balanced tension of warp threads in the pattern and in the fabric edge there does not appear corrugation of the fabric edges and increased number of warp thread breaks, which secures higher productivity of the machine,

• there does not occur disturbing appearance of the fabric due to smashed ends of the weft in the fabric pattern,

• there do not occur problems during fabric refinement due to different tension of warp threads in the fabric and non-dying the fabric in the edge thanks to elimination of double texture/slay of the weft in 7 - 10 mm from the edge.

List of Figures in Drawings

The invention will be explained using the drawing, where Fig. 1 shows the multi-function filling nozzle from the side of nozzles for blowing the weft to the shed, Fig. la shows the detail of the slot for warp with inner nozzle, Fig. 2 shows the multifunction filling nozzle with a movable and a fixed part equipped with edges creating the weft shears, which make its integral part and Fig. 3 shows the original version of the weft shears, always layout out of the filling nozzle.

Example of Invention Embodiment

The layout of the multi-function filling nozzle for the pneumatic weft filler will be explained in individual examples of its realisation. It is apparent that the below stated descriptions are an illustrative expression of application of the principles of this invention, but these are not limiting in any way and within the invention it is possible to perform technical and construction adjustments without going out of its extent.

The layout of the multi-function filling nozzle for the pneumatic weft filler, used for air-introduced edge of the fabric, is shown in Fig. 1 , Fig. 1a and Fig. 2. The multifunction filling nozzle consists of the fixed part 1 and the movable part 2 of the multifunction filling nozzle. The fixed part 1 of the filling nozzle is equipped on one of its sides with a fixed edge 5, which makes its integral part. The fixed edge 5 is one of the parts of weft shears, while - so as to arrange long service life of weft shears - the fixed edge 5 is made of noble steel. When blowing (filling) the weft 9 back to the shed, the other side of the fixed part Λ of the multi-function filling nozzle is equipped with several nozzles 7. The nozzles 7 serve for filling the weft 9 to the shed and they are placed on both sides of the slot 6, which is connected with the inner nozzle. For lead-in of the weft 9 to the slot 6 _j the fixed part of the multi-function filling nozzle is also equipped with the lead-in key 8, which passes into the slot 6 designed for blowing the cut weft 9 from the slot 6. On the upper part of the fixed part 1 of the multi-function filling nozzle there are created holes 3 for air intake to nozzles 7.

The movable part 2 of the multi-function filling nozzle consists of a movable arm which meets the function of a movable edge of weft shears. The movable arm 2 holds a movable edge 4, made of noble steel, which guarantees its long service life and so even the long service life of weft shears as a whole.

The multi-function filling nozzle makes a part of the complete set of pneumatic filler. The weaving loom includes two pneumatic fillers. One of them is designed for filling the weft 9 of the fixed edge for the left side of the fabric and the other one for filling the weft 9 of the fixed edge for the right side of the fabric. In the course of the weaving process, the filled weft 9 in the shed is hit by the beam to the fabric, when the weft 9 goes perpendicularly to the fixed part i of the multi-function filling nozzle and it leads in across the lead-in key 8 of the weft 9 to the slot 6 with the inner nozzle 6 for blowing out the cut weft 9 from the slot 6. After the hit of the weft 9 by the beam to the fabric there is cut the weft 9 by the first edge 4 of the weft shears, which is movable and then the weft 9 is blown out of the slot 6 using the inner nozzle 6 and blowing in the end of the weft 9 by nozzles 7 to a new shed. The whole procedure of filling the weft 9 to the fabric is performed simultaneously on the left and right filler of the weft 9. The length of the cut end of the weft for filling it back to the fabric depends on total thickness of the wall of the fixed part 1 of the multi-function filling nozzle.

Industrial Applicability

The multi-function filling nozzle makes a part of the complete set of the pneumatic filler. Such a device is used as an additional device to a weaving loom, when fixed edge of the fabric is required. List of Relation Marks

1 Fixed part of the multi-function nozzle

2 Movable part of the multi-function nozzle

3 Air intake holes

4 Fixed edge

5 Movable edge

6 Slot for weft with an inner nozzle

7 Nozzle for weft filling

8 Lead-in key

9 Weft