HK1135440B - Device for controlling the transverse movement of the warp threads of a textile weaving machine - Google Patents

Description

Device for controlling the transverse movement of warp threads of a weaving machine

Technical Field

The invention relates to a device for controlling the transverse movement of warp threads of a weaving machine, in particular with a single-strand movement, according to the preamble of claim 1.

Background

Devices for controlling the transverse movement of warp yarns of weaving looms, in particular with single-strand movement, are disclosed by a number of documents. In many of these publications, attempts are made to make appropriate suggestions in order to be able to discard the jacquard harness cords of jacquard machines which have problems with the shedding devices.

EP0353005a1 discloses a drive device for controlling the transverse movement of warp threads, wherein a closing drive cable for a heddle with a linear motor guided by four pulleys is proposed. The invention disclosed in the design of EP0353005a1 suffers from the difficulty that, on the one hand, a large number of linear motors in a large number of adjacently arranged warp threads require sufficient positions, but not sufficient positions for the pulleys, and, on the other hand, the deflection of the linear motors proposed here is too small for the required transverse movement of the warp threads in alternative designs.

WO-A-98/24955 discloses that the drive element of the weaving machine, in this case the heddle or heddle frame, is tensioned between two spring elements and is provided with an electric drive which raises or lowers the drive element with warp threads for forming A shed (Fachbildung). The invention also discloses the proposal of configuring the device as a cantilever in such a way that the majority of the kinetic energy is exerted by the elastic force, while the electric drive is more precisely designed as a device for compensating and controlling the energy losses. But as can be seen from the figures therein, the design with two springs in WO-A-98/24955 also requires A relatively large space. It is also difficult in the device proposed in WO-A-98/24955 to keep the structure of the electric motor small, but to design the motor so powerfully and robustly that the motor should meet the requirements when A plurality of adjacent warp threads forming the shed should yield.

Furthermore, the publications such as WO-A/11327 or WO-A-2006/114188 disclose cantilever devices as such, but do not solve the above-mentioned technical problems.

EP1063326a1 discloses a cable drive for a heddle of a weaving machine with a single movement, wherein it is proposed that the cable is wound on one side on an electrically driven rope pulley and is held tensioned on the other side by a helical spring which is fastened to the weaving machine. The principle of the cantilever arm already disclosed by the above-cited document cannot be realized by the device disclosed in EP1063326a 1.

Finally, WO-A-2006/063584 discloses A shedding device with single-yarn control, wherein A lifting spring frame or A fixed spring frame with locking elements for A single heddle is proposed in A manner known per se. However, shedding devices of this type have proven to be problematic, since the locking elements mentioned are essentially fragile.

EP0347626a2 and DE19849728a1 disclose electric drives for shed forming in weaving machines, which have a bobbin and flat permanent magnets, by means of which it is proposed to carry out a rotary movement for shed forming. In EP0347626a2, a lever effect (gear ratio) is provided.

Disclosure of Invention

The technical problem underlying the present invention is to improve the device for controlling the transverse movement of warp yarns of a weaving machine, in particular with a single movement.

This object is achieved by a device according to claim 1. The measure according to the invention firstly enables very low space requirements at high spinning speeds. The drive motor can be kept small by the directory-like fanning out of the heald drive and by the spring support. In addition, the drive stroke of the electric motor can be kept small by the lever-like reinforcement.

Advantageous configurations of the device are disclosed in claims 2 to 13.

It is advantageous (claim 2) if the drive ratio is designed to be at least twice as large, so that the movement of the electric motor causes a movement of the heddle that is at least twice as large.

A design with a pull rod and a push rod as force transmission elements for driving the transmission elements, which can be conventional heddles in general but in special cases also guide holes, which are arranged directly on the pull rod or push rod, achieves (according to claim 3) a simple construction of the invention.

An advantageous embodiment proposes using the drive of the heald as a force transmission element, which is connected to the electric motor via a cable, wherein the fan-shaped or directory-shaped device is realized by means of a pulley (according to claim 4) or, in another advantageous embodiment, by means of a return lever with a stroke transmission ratio as claimed in claim 5. In this case, the pulley or return lever preferably rotates the cable through 60 ° to 120 °, preferably 75 ° to 105 °, in order to create as many positions as possible for the catalog-like fanning. In this case, if two springs are used, one spring can be arranged here, for example, on the side of the heddle opposite the pulley or the return lever and be designed as a conventional tension spring.

The kinetic energy of the heddle is mainly provided by the spring. The spring is arranged in such a way that it has a high potential energy in each of the first and second end positions as a force which drives the heddle in the direction of the other end position. In the case of a solution with a compression spring and a tension spring or with two tension springs arranged opposite each other, the potential energy of the two springs rises relative to each other. During the movement, the heddle advantageously has a maximum speed in the middle position. The heddle then continues to move towards the respective other end position, wherein the spring can then absorb the kinetic energy of the heddle in the form of potential energy. In order to achieve a controlled movement and to selectively hold in the first or second end position, a holding device is provided for the first end position and the second end position, respectively, during which the movement is stopped and the heddles are held in the occupied end position. Now, in order to realize a controlled movement, an optionally switchable electric motor is additionally provided. The electric motor together with the spring force overcomes the holding force of the holding means and can thus release the heddle out of its holding position. Basically, the motor is set up to release the holding means and to start the movement process. In addition, the electric motor serves to compensate for energy losses and to adapt the device to changing operating conditions. The control of the device is achieved by controlling the motor.

It is advantageous if at least 75% of the kinetic energy is taken up by the spring and the motor supplies up to 25% of the kinetic energy (claim 9). It is furthermore advantageous if the holding element is designed as an uncontrolled permanent magnet which interacts with a magnet counterpart holder, wherein one end of the actuating lever serves as a magnet counterpart holder (claims 10 and 11). Advantageously no force is applied to the heddle in a third shuttle position between the high and low shuttle positions (claim 12). In a symmetrical arrangement, the third shuttle position is the intermediate shuttle position (claim 13).

The components used according to the invention, which are described above and in the following exemplary embodiments, have no particular exclusion with regard to their size, shape, configuration, choice of materials and their technical solution, and therefore the selection criteria known in the respective fields of application can be used without restriction.

In particular, the invention is not limited to weaving machines with a single motion. But the invention can also be applied in weaving machines in which the heddles are united together, for example by means of a shaft or the like.

Drawings

Embodiments of a device for a weaving machine, in particular with a single-strand motion, are described in detail below with reference to the accompanying drawings, in which:

fig. 1 shows a heald drive with a pull rod and a push rod, a stored energy spring and an ac motor according to a first embodiment of the invention;

fig. 2 is a detailed view of the ac motor according to fig. 1;

FIG. 3 is a force analysis graph of the movement of warp yarns;

fig. 4 shows a heddle drive with a tension spring, a bending spring, a cable element and an ac motor according to a second embodiment of the invention;

fig. 5 is a detailed view of the ac motor according to fig. 1;

fig. 6 shows a heddle drive with a tension spring, a cable element and a linear motor according to a third embodiment of the invention; and

fig. 7 is a detailed view of the linear motor according to fig. 6.

Detailed Description

Fig. 1 and 2 show a first embodiment for carrying out the invention.

Fig. 1 shows in a side view a heddle 4 designed as a transmission element for warp threads 2 for driving a weaving machine with a single-strand movement. The warp threads 2 are moved by means of a heddle 4 with a thread eye 3 in such a way that, as shown in the embodiment, they are either in the high or low shuttle position. The heddle 4 is arranged by means of a connector 36 on push and pull rods 30, which each have a different length than the adjacent rods. The drive elements of the heddle 4 can thus be arranged in steps or directory. The stepped or directory-like arrangement is designed in a double manner in that the left half of the heddle 4 is assigned the left row of electric motors 32 and the elements assigned to these motors, while the right half of the heddle 4 is assigned the right row of electric motors 32 and the elements assigned to these motors almost symmetrically. The ends of the push rod and the pull rod 30 are each fixed to an action lever 28 which is operatively connected to an electric motor 32 designed as a rotary motor. Each motor 32 has a coil 6 which is fixed to a coil support 20 which is pivotable about an axis 19. The coil support is in turn arranged between the two substrates 18. Each motor 32 also has an integral permanent magnet plate 16. Due to the polarity of the current flowing through each coil, the coil occupies one of the two illustrated end positions. These two positions correspond to the "high shuttle" position or the "low shuttle" position of the heddle 4 and therefore to the shed of the warp yarns 2.

However, the position of the aforementioned elements is not free, but rather is tensioned by the tension or compression bending spring 8 in such a way that in the two end positions "high shuttle" and "low shuttle" a spring force is exerted which is directed away from the stop, while in the intermediate position of the coil 6 no spring force is exerted. The two stop magnets 26 are arranged in such a way that they form a holding means for the two end positions "high shuttle" and "low shuttle".

Fig. 3 shows the force relationship of the aforementioned elements. Here, a spring force diagram 100 is shown, where the spring force of the tension and compression bending spring 8 is symmetrical and linear before and after the neutral position (the spring force counteracts at the neutral position). During the raising or lowering movement of the heddle 4, a large part of the energy is applied by the spring drive of the tension and compression bending spring 8. However, the movement is initiated by the motor 32.

Once the electric motor 32 is not operated, the corresponding heddle 4 is held fixed by the upper or lower stop magnet 26 in an upper or lower end position corresponding to the high or low position of the warp threads of the weaving loom. This is achieved in that the stop magnet 26, which is designed as a permanent magnet, has a holding force 102 which is greater than the restoring force of the tension and compression bending spring 8 when it is deflected out of the end position. It is to be noted that the holding force of the stop magnet 26 is of a small extent and is therefore only relevant in the vicinity of the lever 28 and thus in the respective end position or in the vicinity of the end positions.

To move the heddle 4, i.e. to start the movement from the upper end position to the lower end position or from the lower end position to the upper end position, the respective coil 6 is now energized and thus the electric motor 32 is operated. The combined force 104 of the motor and the pulling force in the deflected state (i.e. in the end position) and the spring force 100 of the pressure bending spring 8 is greater than the holding force 102 of the respective stop magnet 26.

Now, if the holding force of the stop magnet 26 is overcome, the movement of the heddle by the respective push and pull rod 30 is caused mainly by the spring force of the tension and compression bending spring 8, with which movement the motor 32 moves, but without a significant contribution to the movement. If a further end position is reached, i.e. for example the lever 28 is in the vicinity of the lower stop magnet 26, then a new end position is reached and the tension and compression bending spring 8 remains deflected, since the force of the permanent magnet 26 in this position is greater than the restoring force of the tension and compression bending spring 8, while the motor 32 does not support the spring.

In the embodiment shown here, the tension and compression bending spring 8 moves in a straight line region, so that the spring force diagram 100 can be shown in a straight line. The spring force is supported by the warp force 106 only insignificantly, so that the warp force 105 plays no role here. The stop magnet diagram 102 clearly shows the short effective radius of the magnetic force which is effective only when the lever 28 is in the direct vicinity of the stop magnet 26 and occupies the final position. In the presently described operating mode, the coil force diagram 104 of the electric motor 32 has a constant force, which can be directed in one direction or the other depending on the pole position.

In the embodiment described above, the electric motor 32 is designed in such a way that the heddle 4 can assume an intermediate position in addition to the upper and lower positions, and the heddle 4 can be moved from this intermediate position into the upper and lower positions. This mode of operation has the purpose of allowing a rest position to be assumed in which the tension and compression spring 8 does not exert any force on the push rod and the pull rod 30. The control of the heddle 4 is effected solely by means of the electric motor 32, which for this purpose is connected to a control unit of the weaving loom in a manner not shown.

Fig. 4 and 5 show a second embodiment of a device for driving a heddle of a weaving machine with a single-strand movement in a side view.

In this embodiment, the wires 24 serve as tensioning elements for the heddles and are connected to the heddles 4 in a conventional manner, for example by means of connectors, and each have a length which differs from the length of the adjacent wire. The drive elements can thus again be arranged in a stepped or directory-like manner. The step-like or directory-like arrangement is also provided here in a dual manner in that the left half of the cable 4 is assigned to the electric motor 32, which is likewise designed as a reversible electric motor, and to the upper steps of the components of said electric motor, while the right half of the cable 24 is assigned to the electric motor 32 and to the components assigned to said electric motor. In this case, the end of the cable 24 is likewise fastened to the actuating lever 28, which is operatively connected to the electric motor 32. The electric motor is basically constructed the same as the electric motor in the first embodiment.

In this embodiment, the heddle 4 is tensioned on the side facing away from the electric motor by a tension spring 12 in each case in the low hook position (Tieffachstellung). In this embodiment, the spring force acting against the tension spring 12 is generated by a bending spring 10 arranged on the electric motor 32. In this case, the forces of the tension spring 12 and the bending spring 10 cancel at the center of the coil 6. The two stop magnets 26 are again arranged in such a way that they form a holding means for the two end positions "high shuttle" and "low shuttle". The others are the same as or identical to the first embodiment.

Fig. 6 and 7 show a third embodiment of a device for driving a heddle of a weaving machine with a single-strand movement in a side view.

In this embodiment, the cord 24 also serves as a tensioning element for the heddle. The wire strands 24 in turn each have a different length than the adjacent wire strands. The drive elements can thus again be arranged in a stepped or directory-like manner. However, here too, a ladder-like or directory-like arrangement is provided in a simple manner.

The end of the wire 24 is fixed about an axis to a pivotable action lever 22 which is operatively connected to a motor 34.

In particular, this embodiment differs from the second embodiment in that the cable deflection is not performed via pulleys, but rather via an actuating lever 22 pivotable about an axis, which is coupled to an electric motor 34. The electric motor 34 is designed here as a linear motor. In this embodiment, the wire 24 is tensioned by the two tension springs 12 in such a way that in each of the two end positions "high" or "low" respectively the spring force of the tension spring 12 is produced. In this case, the force of the tension spring 12 disappears at the center of the coil 6 of the motor 34. The two stop magnets 26 are again arranged in such a way that they form a holding means for the two end positions "high shuttle" and "low shuttle". The other relationships are the same as or consistent with the first embodiment.

For the sake of clarity, it is emphasized that a distinction is made between the heddle 4 and the force transmission element 24 or 30 in the description of the invention and in particular in the description of the preferred embodiments. The push rod or strut 30 may also be continuous and thus together form a heddle. Furthermore, the cord 24 can also have eyelets for passing through the warp threads, so that a heddle is formed at the same time.

List of reference numerals

2 warp yarn

3 yarn guide eye

4 harness cord with yarn guide eye

6 coil

8 tension and compression bending spring

10 pressure bending spring

12 tension spring

14 pulley

16 permanent magnet plate

18 base plate

19 axis line

20 coil support

22-linear driving device with graduated wire rope steering device

24-wire rope and tension element

26 stop magnet

28 Lever

30 push and pull rod

32 motor, rotating electric machine

34 motor, linear motor

36 adapter

100 spring force chart

102 stop magnet diagram

104 coil force diagram

106 warp yarn pattern

Claims (13)

1. A device for controlling the transverse movement of warp threads of a weaving machine, with a plurality of transmission elements (4) for transmitting warp threads, which transmission elements each comprise a spring drive (8, 10, 12) with a spring means and a retaining means, wherein the retaining force of the retaining means (26) is opposed to the drive force of the spring drive (8, 10, 12) and the transmission elements (4) can be retained in a high shuttle position and a low shuttle position against a spring force, wherein the transmission elements (4) are furthermore in operative connection with a motor (32, 34) respectively via force transmission elements (24, 30), the shuttle position control being possible via the transmission elements (4) by means of a control motor, and wherein the action of the retaining means (26) is overcome by the combined force of the spring drive (8, 10, 12) and the motor (32, 34), characterized in that the individual transmission elements (4) are each operatively connected to an electric motor (32, 34) by means of force transmission elements (24, 30) of different lengths in a stepped or indexed manner, and that the electric motors (32, 34) have a transmission ratio relative to the transmission elements (4) such that a movement of the electric motors (32, 34) causes a greater movement of the transmission elements (4).

2. Device for controlling the transverse movement of the warp yarns of a weaving machine according to claim 1, characterized in that the movement of the electric motors (32, 34) causes a movement of the transmission element (4) at least twice as large.

3. Device for controlling the transverse movement of warp threads of a weaving machine according to claim 1 or 2, characterized in that the transmission element (4) is operatively connected to the electric motor (32) as a heddle with a pull rod and a push rod (30) by means of a transmission lever (28) arranged on the electric motor (32).

4. Device for controlling the transverse movement of warp threads of a weaving machine according to claim 1 or 2, characterized in that the transmission element (4) is operatively connected to an electric motor (32, 34) by means of a transmission cable (24) and that a pulley (14) or a return lever (22) with a stroke transmission ratio is provided between the transmission element and the electric motor (32, 34) with a spring element of the spring drive (10, 12), respectively.

5. Device for controlling the transverse movement of the warp yarns of a weaving machine according to claim 4, characterized in that the pulley (14) or the return lever (22) with stroke transmission ratio deflects the transmission cable (24) by 60 ° to 120 °.

6. Device for controlling the transverse movement of the warp yarns of a weaving machine according to claim 4, characterized in that the pulley (14) or the return lever (22) with stroke transmission ratio deflects the transmission cable (24) by 75 ° to 105 °.

7. Device for controlling the transverse movement of warp yarns of a weaving machine according to claim 4, characterized in that the transmission element (4) for warp yarns (2) is arranged on one side on a fixedly arranged spring means (12) of the spring drive opposite the motor (32, 34) and the pulley (14) or the return lever (22) with stroke transmission ratio.

8. Device for controlling the transverse movement of warp threads of a weaving machine according to claim 1 or 2, characterized in that the spring drive (8, 10, 12) is designed in such a way that the majority of the kinetic energy is available from the spring drive (8, 10, 12) when the transmission element (4) is operated at the natural frequency of the spring drive (8, 10, 12).

9. Device for controlling the transverse movement of warp threads of a weaving machine according to claim 8, characterized in that the spring drive (8, 10, 12) is designed in such a way that at least 75% of the kinetic energy is available from the spring drive (8, 10, 12) when the transmission element (4) is operated at the natural frequency of the spring drive (8, 10, 12).

10. Device for controlling the transverse movement of warp yarns of a weaving machine according to claim 3, characterized in that the holding means are designed as uncontrolled holding means with stop magnets, wherein the stop magnets (26) are designed as permanent magnets.

11. Device for controlling the transverse movement of the warp yarns of a weaving machine as claimed in claim 10, characterized in that the end for the transmission lever comprises a magnetic counter-holder for a holding means.

12. Device for controlling the transverse movement of warp yarns of a weaving machine according to claim 1 or 2, characterized in that in the third shuttle position of the transmission element (4) between the high shuttle position and the low shuttle position no force is applied to the transmission element (4).

13. Device for controlling the transverse movement of warp yarns of a weaving machine according to claim 12, characterized in that the third shuttle position forms an intermediate shuttle position of the transmission element (4).