WO2007039242A2

WO2007039242A2 - Projectile loom

Info

Publication number: WO2007039242A2
Application number: PCT/EP2006/009472
Authority: WO
Inventors: Markus Farner; Alex Simeon
Original assignee: Sultex Ag
Priority date: 2005-10-01
Filing date: 2006-09-29
Publication date: 2007-04-12
Also published as: EP1777329A1; WO2007039242A3

Abstract

The invention relates to a projectile loom (10) which comprises on one or both ends of the shed yarn-tensioning devices (17) with a plurality of winding arms (39.1 to 39.8) for every weft thread supplied by the yarn-tensioning devices, said winding arms (39.1 to 39.8) being driven individually and preferably being controlled individually.

Description

Proiektil loom

Description:

So far, thread tensioners are known in looms, which tension the weft by means of cams. In order to influence the different tensions of the different weft threads, the use of various cams is necessary. The weaving machine must be shut down, which leads to increased production times.

The present invention has for its object to provide a projectile loom, with the lower production times are possible.

The object is achieved with a projectile weaving machine, which is characterized in that on one or both sides of the shed

Thread tensioner is provided with a plurality of winding arms for each supplied from yarn stores weft, the winding arms are driven individually and preferably individually controlled.

With these new thread tensioners is an individual tension the

Weft threads according to their properties even when the weaving machine is possible. There is no increase in production times. The thread tensioner according to the invention can also be used in other weaving machines not described here. Likewise, the thread tensioner according to the invention can be used alone wherever it is necessary to tension a single thread or several threads during the operation of a device. With the one described here Thread tensioners allow threads of different types to be individually tensioned or loaded.

For this purpose, the drive of the winding arms depending on the yarn properties of the individual weft threads can be controlled such that the thread tension remains constant or regulated variable. In particular, the timing and the speed of Aufwickeins can be individually adapted to the individual yarn qualities.

A second variant of a weaving machine according to the invention has on one or both sides of the shed a thread tensioner which is provided with at least one element for each supplied from a yarn store weft, which for clamping, for passing a projectile and to release the weft yarn linear motion performs.

In this variant, the thread tensioner therefore has at least one linearly movable element for tensioning and releasing the weft thread as well as for transferring it to a projectile, instead of the winding arms which carry out a rotary movement. Linear movements can be controlled more precisely than rotational movements; the elements required for this purpose are preferably lifting cylinders, in particular electric or pneumatic lifting cylinders. If several elements are provided, then they can be driven individually and preferably also individually controlled.

Further advantages are obtained when the weaving machine has a weft selection device in the form of an air nozzle, which transfers the weft thread from the thread tensioner to a projectile.

The projectile weaving machine according to the invention can also be optimized in terms of performance and costs by a new configuration of the projectiles for weft threads, which can be different. Thus, the at least one projectile can have at both ends a clamping device for a weft thread and a weight of at most 100 g, preferably of 20 g. The two clamping devices allow to enter the projectile from both sides in the shed, without having to rotate it beforehand. Due to the low weight, the projectile can be accelerated to high speeds, so that the weaving machine can be operated with a high stroke rate. The clamping devices at the two ends can also be designed differently, in particular have different clamping surfaces and clamping forces, so that weft threads of different quality can be entered. By providing two clamping devices at the ends of the projectile also the weft waste can be minimized.

For clamping the weft thread magnetic forces can be used. This makes it possible to realize a particularly low weight of the projectiles. In addition, the clamping devices can be arranged on a common rocker arm and open and close alternately. This very simple structure also contributes to the weight reduction of the projectile.

The projectile loom can also at least one accelerator device for at least one projectile for

Weft insertion, wherein the acceleration device may have a non-uniformly translating gear for driving a movable against the projectile acceleration element which shoots the projectile in the shed formed during the weaving process. The weaving machine can also have an acceleration device for the at least one projectile on both sides of the shed.

The replacement of the torsion bar commonly used to accelerate the projectile by an unevenly translating gear to provide the energy for the acceleration of the projectile increases the efficiency of the loom crucial. In contrast to a torsion bar, such a transmission also requires no oil cooling. The weft insertion can thus be made from both sides into the shed. For this purpose it is sufficient to provide a single projectile, which is entered alternately from the left and from the right in the shed. This eliminates the device for returning the projectiles, as required in projectile looms with one-sided weft insertion. Although in such an embodiment of the loom two

Acceleration devices required, but they are each less heavily loaded than the accelerator of a projectile loom with unilateral weft insertion, as always one accelerator is at rest, while the other accelerator accelerates the projectile. The devices can thus be designed to be weaker and are therefore more favorable to manufacture than a device designed for a continuous loading. In addition, by providing two accelerators which register a projectile alternately from left to right in the shed, web speeds can be achieved which are not achievable with a single-weft projectile weaving machine. Another advantage of the two-sided weft insertion is the ability to produce more uniform fabric than machines with one-sided weft insertion, since the ever-present differences in tension of the weft threads between the entry side and the discharge can be better compensated for two-sided weft insertion than one-sided weft insertion.

There is also the possibility of entering from the two sides of the shed and by means of two different clamping devices in the projectile weft threads of different colors and different qualities and thereby produce novel tissue.

For the design of the uneven translating gearbox different variants are conceivable. In a preferred embodiment, the transmission may have eccentrically mounted and / or deviating from the round shape gears to the required short-term high Acceleration of the acceleration element to achieve. It may also be provided a curve drive.

In principle, the acceleration element, in this case a lever, can be used to accelerate the projectile via the central drive of the weaving machine. However, the accelerating device may also have its own motor, such as an electric motor, preferably an asynchronous motor. As a result, the energy necessary for the acceleration of the projectile can be made available immediately after the weaving machine has been switched on. The design of the transmission is easier in the presence of its own drive. It is understood that hydraulic or pneumatic drives for the accelerator device can be used.

The weaving machine according to the invention can also have in known manner on one or both sides of the shed a device for selecting the supplied from different yarn stores weft threads. In this case, the efficiency of the loom can be increased by the fact that the device for selecting the weft threads has a plurality of adjacently arranged and transversely to the weft insertion direction linearly displaceable thread tongs. Known devices for selecting a weft thread, in particular for color selection, have a plurality of rotationally adjustable thread clamps which optionally supply the projectile with its weft thread. However, the adjustment of these clamps is more complex than the linear displacement of the thread tongs in the selection device of the weaving machine according to the invention. In this case, this selection device can be used with advantage also in weaving machines with another principle of weft insertion, ie also in rapier looms or drag shuttle looms. Of course, the use in classic projectile weaving machines with a torsion bar drive of the projectile is possible.

Conveniently, a motor-driven traction means, preferably an endless rope or an endless belt for shifting the yarn tongs be provided, to which the thread tongs are attached. Such a cable drive with a stepper motor is cheaper than a drive with a linear motor. Chain and belt drives via one or two rollers can also be used.

Each of the thread tongs can optionally be brought into a selection position, from which it can be moved to the thread transfer to the projectile and thread takeover to the fabric edge. The selection position is in the extension of the longitudinal axis of the projectile. By transferring the weft thread from the selected thread tongs to the projectile, the weft thread remains constantly guided, i. This creates a so-called positive weft thread entry. In addition, the picking up of the weft yarn at the fabric edge has the advantage that less weft yarn waste occurs.

For movement of the selected thread tongs on the projectile and / or on the fabric edge to and back to the selection position may be provided engageable with the selected thread pliers driver. This has the advantage that only one drive for the driver and not for all thread tongs is required.

Also, the driver can be attached to a driven traction means, preferably an endless rope or an endless belt, which can achieve the same advantages as in the movement of the thread tongs.

In the weaving machine according to the invention can continue on both sides of the

Shed a device for braking the at least one projectile be provided, which has two relatively movable jaws that clamp the projectile laterally and thereby decelerate. This device can be used simultaneously to hold the projectile in a defined launch position prior to launch. Here are the

Open jaws, however, support the projectile from below and form at the start a lateral guidance. In addition, projecting from below into the shed support elements may be provided which guide the at least one projectile during its flight through the shed from below and to the side. Known support elements for projectiles are C-shaped and therefore lead the projectile on the top, which, however, creates a higher friction and thus not as high speeds of the projectile can be achieved as in a leadership of the projectile exclusively from below and from the sides. Furthermore, by reducing friction, wear is kept low.

Hereinafter, a preferred embodiment of a εrfindungsgemäßen projectile loom will be described with reference to the drawing.

Show it:

Fig. 1 is a perspective view of the essential components of a projectile weaving machine according to the invention;

Fig. 2 is a perspective view of the thread tensioner of the weaving machine of Fig. 1;

3a-d is a perspective view of an alternative embodiment of a

Thread tensioners in different working positions;

Fig. 4 is a view of a third embodiment of a thread tensioner in

Transfer position of the weft thread to a projectile;

Fig. 5a, b is a perspective view of the projectile of the loom of Figure 1 for left and right weft insertion.

Fig. 6 is a detail view of the accelerator device for the projectile of the weaving machine of Fig. 1; Fig. 7a, b is a perspective view of the weft selection device of the weaving machine of Fig. 1 in two different positions;

Fig. 8 is an enlarged detail view of Fig. 6 a;

9 is a perspective view of the braking device of the weaving machine of FIG. 1.

Fig. 1 shows a projectile loom 10 in its essential components in a perspective view. The projectile weaving machine 10 is designed for a weft insertion from both sides into the shed formed during the weaving process, which is indicated by two warp threads 12, 13. The shed, through which the projectile is transported, lies on the opposite side of the heald 43, which can not be seen in the figure. It has a symmetrical aggregate arrangement on both sides of the shed. Thus, two accelerators 14, 14 'for projectiles, two weft selection devices 15, 15', two braking devices 16, 16 'and two thread tensioning devices 17, 17' are provided. These units are shown and described more clearly in the following figures 2 to 8. In addition, in Fig. 1, the heald 43 of the loom 10 can be seen.

In Fig. 2, the thread tensioner 17 of the loom 10 is shown in more detail. He has a total of eight winding arms 39.1 to 39.8, which are each driven by a separate electric motor 40.1 to 40.8. Each of the winding arms 39.1 to 39.8 can wind the end of a weft thread as soon as the weft thread has been cut off. The end is held clamped by the thread tongs 26.1 to 26.8, which are shown in FIG. 6, wherein the weft threads extend through the eyelets 27 coming from the winding arms 39.1 to 39.8. The winding arms 39.1 to 39.8 serve as a buffer for the weft yarns to keep the yarn tension constant. The single motor drive of the winding arms 39.1 to 39.8 allows each Wind the weft thread individually according to its properties so that the thread tension remains constant. Switching to weft threads of other qualities is possible without conversion measures on the weaving machine and while the machine is running simply by a corresponding change in the control of the motors 40.1 to 40.8. In addition, it is by the thread tensioner 17 with the individually driven winding arms 39.1 to 39.8 easier to provide weft yarns of different qualities for the fabric, as in mechanically operating thread tensioners according to the prior art.

Figures 3a to 3d show an alternative embodiment of a

Thread tensioner 50 in combination with a weft selection device of a loom according to the invention. In contrast to the thread tensioner 17, the thread tensioner 50 has no rotatable winding arms, but two linearly movable elements 51, 52, which are designed as cylinders, preferably electric or pneumatic lifting cylinder, wherein the piston on the

Each have an eyelet 51.1, 52.1. Through both eyelets 51.1 and 52.1 a weft thread 53 is guided, which is supplied from a yarn store, not shown. Except through the eyelets 51.1 and 52.1, the weft thread through two fixed eyelets 54, 55 and an air nozzle 56 is guided. Fig. 3a shows the elements 51, 52 in the starting position, i. both elements are fully retracted. From this position the air nozzle 56 is actuated and at the same time the lifting cylinder 52 is extended and thus the weft thread is transferred to the projectile (FIG. 3b). Now the element 52 is extended, so that the weft thread 53 between the eyelets 55, 52.1 and the air nozzle 56 takes a straight course. After the projectile 21 the

Weft has detected, the element 51 is extended so that the projectile 21 after its acceleration, the weft yarn without friction through all eyelets 54, 51.1, 55, 52.1 and the air nozzle 56 can deduct, as shown in Fig. 3c. After the weft thread 53 has been passed through the shed, it is cut off and initially withdrawn by the element 51, which moves downwards. This is shown in Fig. 3d. Subsequently, the element 52 moves downward, so that again in Fig. 3a shown starting positions, from which the weft thread 53 can be transferred to a projectile 21 again.

In Fig. 4, a thread tensioner 50 'is shown, which is similar to the thread tensioner 50 of FIG. 3, but only a linearly movable member 51' in the form of an electric or pneumatic cylinder has. At the top of the piston of the cylinder 51 'is again an eyelet 51.1' is arranged, through which the weft thread 53 is guided. In Fig. 4, the eyelet 51.1 'is in a middle position. This corresponds to the transfer position of the thread tensioner 50 shown in FIG. 3b. In this position, the weft thread 53 is transferred through the air nozzle 56 to the projectile 21. The weft thread 53 is in contrast to the fully retracted position of the eyelet 51.1 'no longer completely stretched, but also not fully released, which is effected by extending the eyelet 51.1' in the outermost position. The complete release of the weft thread 53 takes place in the next step, when the projectile 21 is moved through the shed. Thus, Fig. 4 illustrates that the two cylinders 51, 52 of the thread tensioner 50, each of which can move their eyelets 51.1 and 52.1 between a fully retracted and a fully extended position, can be replaced by a single pneumatic cylinder 51 'when its eyelet 51.1 'a total of three different

Positions, a fully retracted, a fully extended and an intermediate position can take.

Fig. 5a, 5b show a possible embodiment of a projectile 21. This has at both ends a clamping device 35, 36, so that a

Weft can be clamped both at one end and at the other end. The clamping can be achieved, for example, by magnetic forces. In the example shown, the clamping devices 35, 36 are arranged on a common rocker arm 37, so that in alternation always one of the clamping devices 35,36 closed and the other is open. The clamping devices 35,36 may be identical or in particular different clamping surfaces and / or clamping forces have, so that weft yarns 53 different yarn qualities can be entered from the two sides of the shed into this.

6 shows an enlarged detail view of the acceleration device 14 with its own electric motor 18, which drives an acceleration element 20 via an unevenly translating transmission 19, wherein the acceleration element 20 is movable against a projectile 21, in particular FIG. 5, and this thereby into the shed shoots. The transmission 19 shown here has a plurality of deviating from the circular shape gears 22, 23, 24, 25, which are also mounted eccentrically. It can also be provided a cam drive to cause the short-term strong acceleration of the Beschieunigungseiements. With the help of this transmission 19, the required short-term and strong acceleration of the acceleration element 20 can be achieved over a certain angular range.

The acceleration device 14 'arranged on the other side of the shed is constructed identically to the acceleration device 14.

Figures 7a, b show an alternative embodiment of a weft selector 15 to that shown in Figure 3 having an air nozzle. The device 15 has in the example shown eight adjacently arranged thread tongs 26.1 to 26.8. Each of the thread tongs 26.1 to 26.8 is supplied from thread stores, not shown here, by means of eyelets 27 arranged in a plate (not shown), wherein the individual weft threads may differ from one another, in particular in color and quality. The thread tongs 26.1 to 26.8 are releasably attached to an endless rope 28, which is guided over a deflection roller 29 and driven by a stepping motor 30. As a result, the thread tongs 26.1 to 26.8 can be moved transversely to the longitudinal direction of the projectile 21, so that each of the thread tongs 26.1 to 26.8 can be brought into a selection position in which it is located in the extension of the longitudinal axis of the projectile 21. In the example shown, the thread tongs 26.1 is in the selection position and at the same time has been moved from this to the projectile 21. In this position, the thread tongs 26.1 can pass the weft thread held by it to a clamping device of the projectile 21. After the transfer has been completed, the thread tongs move to the edge of the fabric in order to retain the weft thread after the entry (reduction of weft yarn waste). After the transfer, the thread tongs 26.1 moves back into the selection position in which it is again parallel to the other thread tongs 26.2 to 26.8. To move the thread tongs 26.1 to 26.8 on the projectile 21 to a driver 31 is provided which is engageable with each of those thread pliers, which is in selection position. The driver 31 is also attached to an endless cable 32 which is driven by an electric motor 33.

Fig. 7b shows one of the Fig. 7a corresponding representation, but now the thread tongs 26.3 has been brought into selection position and has been moved by the driver 31 to the projectile 21 to.

In Fig. 8, the thread tongs 26.1 and a projectile 21 ', which differs slightly in construction from the projectile 21 of Fig. 7a, shown in an enlarged view. To transfer the weft thread, the thread tongs 26.1 moves into a U-shaped recess 34 at the end of the projectile 21 '. In the U-shaped recess 34 a clamping device of the projectile 21 'not shown here is arranged, which takes over the weft thread from the thread tongs 26.1. The clamping device of the projectile 21 'is actuated by a lever 35' and a magnet arrangement 36 '. The projectile 21 'is formed symmetrically with respect to its central transverse axis 37' and therefore also has at its other end, which is not visible in Fig. 7, a clamping device which can be actuated via a lever 35 " how the driver 31 engages with a projection 31.1 in a groove 38 on the underside of the thread tongs 26.1.

Finally, FIG. 9 shows the braking device 16 in an enlarged view. The braking device 16 has two jaws 16.1 and 16.2, which in Arrows 16.3 relative to each other are movable and the projectile 21 can pinch between them. Are the jaws 16.1, 16.2, as shown in Fig. 9, open, they support the projectile 21 in the firing position both laterally and from below. For this purpose, grooves 41.1 and 41.2 are respectively provided in the clamping jaws 16.1 and 16.2 in which the projectile 21 can be guided as in rails. In the firing position of the projectile 21 shown in FIG. 9, the acceleration element 20 of the accelerator 14 can be moved against the end of the projectile 21 and thereby inject it into the shed 11. To guide the projectile 21 in the shed are projecting from below into the shed and in particular from the figures 7a, b support members 42 provided which support the Projektii 21 during its Fiuges by the shed 11 from below and laterally. For this purpose, the support elements 42 are formed substantially U-shaped. About the jaws 16.2, a guide rail 44 is arranged, which leads the respective thread pliers, here the thread tongs no. 1, from the selection position in a transfer position of the weft thread to the projectile 21 to the fabric edge and back to the selection position. The endless cable 32, which holds the driver for the thread pliers, is held on a support 45 via deflection rollers.

46 shows the front opener for the thread tongs, which takes over the weft thread near the fabric edge. After the takeover, the weft is cut off. The necessary cutting device is not shown in the figure.

Claims

claims:

1. Projectile weaving machine, characterized in that it has on one or both sides of the shed thread tensioner (17,17 ') with several winding arms (39.1 to 39.8) for each of yarn stores supplied weft, wherein the winding arms (39.1 - 39.8) individually are driven and preferably driven individually.

2. Projectile weaving machine according to claim 1, characterized in that the drive of the winding arms (39.1 to 39.8) is controllable in dependence on the yarn properties of the individual weft threads such that the thread tension remains constant or regulated is variable.

A projectile weaving machine, characterized in that it comprises on one or both sides of the shed a thread tensioner (50) which is provided with at least one element (51, 52) for each weft yarn (53) supplied by yarn stores, which Clamping, for passing on a projectile and for releasing the weft thread (53) a

Performs linear movement.

4. Projectile weaving machine according to claim 3, characterized in that the element (51, 52) is a lifting cylinder, preferably an electrically or pneumatically driven lifting cylinder.

5. Projectile weaving machine according to one of claims 1 to 4, characterized in that it comprises a weft selection device in the form of an air nozzle (56), which transfers the weft thread (53) from the thread tensioner (50) to a projectile.

6. Projectile loom according to one of claims 1 to 5, characterized in that the at least one projectile (21, 21 ') to its central transverse axis (37') at both ends of a clamping device (35, 36) for a weft thread and has a maximum weight of 100 g, preferably 20 g.

7. Projectile loom according to claim 6, characterized in that the clamping devices (35, 36) are designed differently at both ends for clamping different yarn qualities.

8. Projectile weaving machine according to claim 6 or 7, characterized in that the clamping devices (35, 36) clamp the scarf thread (53) with magnetic force.

9. Projectile loom according to one of claims 6 to 8, characterized in that in each case one of the clamping jaws of the two clamping devices (35, 36) on a common rocker arm (37) is arranged.