WO2014177414A1

WO2014177414A1 - Method for inserting weft ends in a weaving machine having additional weft effects

Info

Publication number: WO2014177414A1
Application number: PCT/EP2014/058055
Authority: WO
Inventors: Harald Arnold; Peter Czura
Original assignee: Lindauer Dornier Gesellschaft Mit Beschränkter Haftung
Priority date: 2013-04-29
Filing date: 2014-04-22
Publication date: 2014-11-06
Also published as: RU2609188C1; JP2016520729A; TR201802890T4; BR112015026988A2; CN105431582A; SA515370065B1; DE102013207805A1; JP6113912B2; CN105431582B; EP2992128B1; EP2992128A1

Abstract

The invention relates to a method for inserting weft ends into a shed (1.1, 1.2) of a weaving machine. Wefts (3) are selected using weft selection means (19) which are inserted into the shed by means of weft inserting means and are fastened to a fabric edge by a weaving reed device (7, 7.1, 10). A fastened weft (3) is held in the region of the fabric edge in a specific position by holding means for the weft, wherein a change of the shed is carried out by the shedding means (4) after the weft insertion. The wefts are moved using the holding means for the wefts such that they reach a position in which they are cut by weft shears. A weft end is thus created, which is then detected by an inserting means and inserted into the shed. Between two successive weft insertion processes for a first and a second weft, the following processes occur: an additional weaving reed stop occurs via the weaving reed device, wherein no weft is entered and fastened to the fabric edge, however; and no weft end of the first inserted weft is inserted into the shed; and an effect thread extending in the warp direction for creating additional weft effects is moved in the weft direction on the weaving machine by means of a moving device.

Description

Method for inserting weft thread ends on a loom with

Additional shot effects Technical area

The present invention relates to a method for inserting

Weft ends on a loom with additional weft effects.

State of the art

In weaving machines, it is known in the prior art to include additional threads extending substantially in the warp direction in such a manner to the weave that certain additional impact effects are achieved. For this purpose, these effect threads are prior to the entry of a weft thread for each

Movement cycle of the loom in the weft direction brought into a different position.

A method for weaving patterning and a weaving machine for producing fabrics with such additive shot effects is shown, for example, in US Pat

Patent application WO 2012004021 A2. The method for fabric production according to WO 2012004021 A2 is characterized in that an effect thread is positioned above the weft thread to be introduced and in the vertical direction emerges from a unilaterally upwardly open reed gap formed by reed teeth. After a shift of the effect thread in the weft direction of this is positioned below a next to be entered weft thread and immersed in another similarly formed Rietlücke.

In order to produce the movement according to the described method, a guide means of the effect yarn in the vertical direction and in the

Shot direction moves. The loom according to WO 2012004021 A2 contains a displacement drive, which drives a displacement device in the weft direction, on which at least one guide means is provided, with which an effect thread can be displaced in the weft direction and positioned vertically.

For fabrics with additional impact effects, it is now additionally provided

Insert weft thread ends in the shed to form a so-called insert edge. Fabric with insert edge and devices for forming such insertion edges are, inter alia, from EP 0 149 696 A1, JP 21 12446 A and the

US 5,158,119 A known.

These documents disclose the registered weft threads of

Holding means are detected. The holding means then bring the weft thread into a position in which it is cut. The cut-off weft end is then grasped by a loading means - for example a hooked or looped needle - and inserted into the shed. In web patterns with additional firing effects usually two immediately successive weft threads in the tissue binding points with the

Have effect thread. For this purpose, the respective effect thread between the two in the fabric successive weft threads must be positioned vertically and in the weft direction. With increasing engine speed stands for the

Positioning the guide means but less and less time available. Nevertheless, in order to be able to bring the effect thread into the correct position between the formation of binding points with two weft threads following each other in the tissue, it is therefore provided for between two cycles of movement

Weft entry to realize a movement cycle without weft insertion.

If these fabrics are also to have an insert edge, certain problems arise. It has been found that the insertion edge becomes uneven when the cut end of the thread last

registered weft thread is inserted into a shed and struck there by the reed, if in this shed no registered weft thread is present.

Object of the present invention is to provide a method by which tissue can be produced with additional bullet effects and good quality of the insert edge. Description of the invention

The object is achieved by a method according to the independent claim. In the method of loading weft ends into a loom of a loom, the shed is formed by shed-forming means which vertically move warps in a known manner. In the method, a weft thread is selected by means of weft selection means before each weft insertion. The weft selection means may be electromechanical or

be electropneumatic agents well known to those skilled in the art. In the method, after the formation of a shed, a first weft insertion takes place. For this purpose, weft insertion means are present on the weaving machine. These may be already known mechanical or pneumatic weft insertion means. The first weft thread is struck by a Webblatteinrichtung to a fabric edge.

The damaged first weft thread is then held in a certain position with holding means for the weft thread in the region of the fabric edge. These holding means may, for example, mechanical thread clamps or

Be thread guide elements. However, it can also be used air nozzles that hold the thread in a specific position.

After the weft insertion - ie immediately before or after the reed stop - a change of the shed takes place, in which the position of the warp threads by the shedding means changes from top to bottom. The method further provides that the first weft thread is displaced by means of the holding means for the weft thread. For this purpose, the holding means is provided with a mechanical or pneumatic control. These can be, for example, cam gears, linear motors or pneumatic valves for controlling air nozzles.

During the displacement, the first weft thread reaches a position in which it is cut with the help of a weft cutter. It creates a first

Weft end, which is then detected by an insert. The

Insertion means may be a loading needle with thread hook or thread eyelet. However, it can also be provided an air nozzle, which detects the first weft end by means of an air jet. With the help of the insertion means, the first weft thread end is then inserted into the shed.

The method further provides that a second weft thread is selected by means of the weft selection means.

The second weft thread is entered into the shed with the weft insertion means. Subsequently, the second weft thread is struck by means of Webblatteinrichtung together with the first weft end to the fabric edge The battered second weft thread is then held with the holding means for the weft thread in the region of the fabric edge in a certain position. After the weft insertion - ie immediately before or after the reed stop - the position of the warp threads with the help of the shedding means changes from top to bottom - a new shed is formed.

Then the second weft thread is displaced by means of the weft thread holding means.

During the displacement, the second weft thread reaches a position in which it is cut with the help of the weft cutter. It creates a second

Weft end, which is then detected by the insert.

With the help of the insertion means, the second weft end is then inserted into the shed.

The method is characterized in that between the two successive weft insertion operations of the first and second weft thread another reed beating takes place by the Webblatteinrichtung, but no weft thread is struck against the fabric edge. This is achieved by the fact that after the previous Webblattanschlag no further

Weft is entered into the shed. To achieve this, for example, the weft selection means are controlled so that for a

Movement cycle of the loom no weft insertion takes place. There is thus a motion cycle with a so-called empty shot in the process. As a cycle of motion of the loom here the period is referred to, which lies between two Webblattanschlägen. The main drive shaft of the loom makes a full turn. The inventive method further provides that between the two consecutive weft insertion operations of the first and second

Weft a thread running in the warp direction thread in the weft direction is moved to the loom. The weft direction is the direction in which the weft thread is entered.

In connection with the present invention, there is talk of

Procedures in normal weaving operation, that is the normal

Web patterning with the weaving machine running and not only in connection with processes in case of malfunction.

The method according to the invention thus also encompasses a method in which a continuous change between empty shots and normal weft insertion takes place over a large number of weft insertion, wherein no weft thread end is inserted into the sheds into which no weft thread is inserted.

For example, a displacement device already known from the prior art can be provided with a guide means for the displacement process

Effect thread can be used.

The weave pattern including the move operation and the

Insertion can be done with the help of records via a control of

Weaving machine, for example, be made according to WO 2012004021 A2. The pattern-controlled activation of the holding means for the weft thread can be realized by the insertion of additional data in the sample cartridge of the respective tissue. When empty shot, the holding means so

controlled that the weft thread can not be cut and detected by the insertion means. This can be done for example by the control of electromagnetic means in the cam gear. It can be lifted, for example by an electromagnet which acts on the roller lever of the cam gear, the roller of the cam gear as needed in the weave pattern of the cam. As a result, the weft thread with the holding means remains in a position on the fabric edge, in which it can not be detected by the insert. The insert means itself - for example, a cam gear controlled by a loading gear - can therefore continue to run in idle mode - ie without weft insertion, without thereby a weft end is inserted. Figures 1 and 2 show in partial views of a weaving machine for carrying out the method. The weaving machine includes shed drives 9 for driving shedding means 4, by the vertical movement of which a warp shed 1 bounded by warp yarns 1.1, 1 .2 is formed. Those known to those skilled in the art

Shed drive 9 may, for example, consist of a group of levers and rods which are arranged below the shed forming means 4 and which are the

Drive movements of a shedding machine 23 to the shedding means 4 transmitted.

The shed forming means 4 consist in the present example of known

Healds with strands, through the Litzenaugen the warp threads 1 are performed. Furthermore, facilities for the entry of a weft thread 3 in the shed 1 .1, 1 .2 in a weft direction 12 are present. In the example in Figures 1 and 2, a device is shown with grippers, in a known manner via not shown gear and two drive wheels from both sides of the

Loom from in the shed 1 .1, 1.2 are pushed. The weft thread 3 is fed in this embodiment of a shot coil on a Vorspuler and a selection device for the Schussfadenart 19 one of the two grippers and transferred to the other gripper in the machine center. Of course, the use of different weft types for different

Motion cycles conceivable. The selection and presentation of the weft threads 3 to a gripper takes place e.g. by means of a weft selection device for the

Weft type 19. Such embodiments are known in the art.

The control device 8 of the loom is further equipped with input means 21 and storage means 22.

Of course, the weft insertion devices may also be designed as weft protectors, projectiles or pneumatic weft insertion devices.

On the loom according to Figures 1 and 2 is still a

Webblatteinrichtung 7,7.1, 10 for striking the weft thread 3 to a fabric edge 13 present, which consists of a Webblattlagerung 10 with reed teeth 7 and a Rietbund 7.1. These reed teeth 7 form between one side upwardly open receiving spaces, so-called Rietlücken 14, so that threads in the direction of the warp threads 1 from back to front through the Loom running, dip from above into these Rietlücken 14 and thus can be performed by the reed teeth 7 in the weft direction 12.

The reed teeth 7 are attached to the Rietbund 7.1 to the Webblattlagerung 10 and lead together with this at each cycle of motion

Loom a stop movement 15 - 15.1 off. Finally, in the

present embodiment according to Figures 1 and 2 a

Displacement device 5 with a prismatic guide on the frame of the

Webschaft mounted on the three guide means 1 1 are mounted, with which three effect threads 2 can be moved in the weft direction 12 by the path A.

As a guide means 1 1 needles with eyelets 18 are used in the present embodiment, one or more of which are attached at one end to a needle bar. This needle bar forms together with a running in the weft direction 12 prism-shaped linear guide the

Displacement device 5, which is fastened together with an electric motor drive as a displacement drive 6 at the front of a heald. When

Displacement drive 6, a linear drive is provided, the stator is integrated in the frame of the heald or in the prismatic linear guide. By the displacement drive 6, which drives the displacement device 5, displacement paths A of the effect threads 2 can be predetermined in each movement cycle of the weaving machine. The respective displacement A is derived via a control device 8 and the displacement drive 6 for each movement cycle of the loom of a data set. A computer program which runs in the control device 8 calculates the displacement paths A from the data records.

The data records can also contain values for controlling the

Weft selection means and the means for holding and inserting the

Weft threads are stored.

Claims

claims

1 . Method for inserting weft ends into a shed of a

Weaving machine, wherein the shed is formed by shedding means, are moved vertically by the warp threads and wherein by means of

Weft selection means, a first weft yarn is selected, which registered by means of weft insertion means in the shed and with a

Webblatteinrichtung is struck to a fabric edge and wherein the troubled first weft yarn is held with holding means for the weft in the region of the fabric edge in a certain position, wherein after the weft insertion by the shedding means a change of the shed is performed and further provided that the first Weft is shifted by means of the holding means for the weft, so that the first weft thread comes into a position in which it is cut by means of a weft scissors, wherein a first weft end is formed, which is then detected by an insertion means, through which the first weft end in the shed is inserted, further, a second weft yarn is selected by means of the weft selection means and entered with the weft insertion means in the shed, whereupon the second weft thread by means of the Webblatteinrichtung together with the first weft thread end angeschl to the fabric edge and whereupon the damaged second weft yarn is held in a certain position with the holding means for the weft in the region of the fabric edge and wherein after the weft insertion by the shedding means a change of the shed is performed and wherein the second weft yarn by means of the holding means for the weft is moved to a position in which he with the help of

Weft shear is cut so that a second weft end is formed, which is then detected by the insert and inserted into the shed, characterized in that

in normal weaving operation between the two consecutive

Weft insertion operations for the first and second weft thread following operations proceed

there is another reed stop by the Webblatteinrichtung instead, but the weft selection means are driven in this way, that no weft thread is entered and struck on the fabric edge and

the holding means for the weft thread are driven in such a way that no thread end of the first inserted weft thread is inserted into the shed and

an effect yarn in the warp direction for the formation of

Additional shot effects is by means of a displacement device in

Shot direction shifted on the loom.