HK1089487B

HK1089487B - Loom

Info

Publication number: HK1089487B
Application number: HK06109814.9A
Authority: HK
Inventors: Francisco Speich
Original assignee: 泰克斯蒂尔玛股份公司
Priority date: 2003-06-12
Filing date: 2004-06-03
Publication date: 2011-03-18

Description

Loom with a movable loom head

Technical Field

The invention relates to a weaving machine according to the preamble of claim 1.

Background

The document WO99/13145 discloses a weaving machine of the type mentioned at the outset. The loom comprises a warp thread tensioning device and a shedding apparatus, which pretensions warp threads to form a first shed position. The swing-driven lifting device is equipped with a warp drive, in order to bring the warp threads selectively into a position cooperating with the drive, a control element is provided which is driven by an actuator, which drive then brings the warp threads into a second shedding position. Such a weaving machine has the disadvantage that the lifting device with the drive has to be moved along the entire stroke of the warp movement from the first shed position up to the second shed position. The lifting device therefore has to perform a relatively long movement, which is time-consuming on the one hand and requires a high drive power on the other hand. In order to avoid this disadvantage, document WO99/13145 describes in its further exemplary embodiment that the warp threads are assumed to be in the middle shed position and that there are two lifting devices, each of which has a drive in order to move the warp threads into the upper shed position or into the lower shed position. This requires doubling the number of drivers, with the result that design variants are very complex and therefore costly.

Disclosure of Invention

The object of the invention is to improve the performance of a weaving machine of the type mentioned at the outset.

The set object is achieved by the features characterized in claim 1. Since the loom has a second lifting device common to all warp threads, which moves the warp threads out of the first shed position into a switching position effective for the first lifting device, this allows all warp threads to be located in a very simple second lifting device and advantageously reduces the switching stroke of the first lifting device, so that the first lifting device only has to move the warp threads out of the switching position into the second shed position. Both lifting devices have to perform a limited stroke which requires less time. Furthermore, since the lifting means can be simultaneously effective, the performance of the weaving machine can be significantly improved. Furthermore, due to this design, the service life is also increased due to the lower susceptibility to wear. The noise emitted by the loom is also low.

Further advantageous effects of the weaving machine are described in claims 2-22.

According to claim 2, the second lifting device can be a lifting shaft passing through all warp yarns. The lifting strokes of the second lifting device can be very different and it is advantageous if, according to claim 3, the latter can perform at least half of the lifting strokes of the warp yarns in the shed.

With regard to the design of the first lifting device, WO99/13145 has disclosed various design embodiments. The embodiment as claimed in claim 4 is particularly advantageous according to which the first lifting device has a control drop wire for each warp thread, which drop wire is provided with a driver slot and a matching driver for the relevant warp thread and is preferably designed in hook form. By means of a control drop wire controlled by an actuator, the warp threads can be brought selectively into a position in which they cooperate with the drive. According to claim 5, the driver slot is located in the displacement travel of the driver and is guided in the switching region via a control slot, which is arranged obliquely with respect to the displacement direction of the driver, out of the displacement travel of the driver into a widened guide slot of the control drop wire. According to claim 6, the guide groove is formed with a continuous side for the introduction of warp threads into the control groove.

In principle, the control drop wire can be configured as a thin steel sheet strip. The design of claim 7 is advantageous, however, in that the control dropper is formed in the shape of a sleeve with two side walls between which the driver is movably arranged. This achieves a reliable reciprocating transport of the warp threads relative to the drive. In order to protect the warp threads on the one hand and to pass the warp threads through the control drop wires on the other hand, according to claim 8, at least the guide groove and the control groove are offset from each other in the warp transport direction in both side walls of the control drop wire, such that the offset of the warp threads transported in the control drop wire is less than 90 °, preferably 10 °.

The drives of the drives have various possibilities, and it is preferred according to claim 9 that the drives of a row are all moved up or down by means of a common lifting knife. This provides an extremely simple and cost-effective solution.

Since the displacement travel of the warp threads is in each case from the first shed position into the second shed position, the elasticity of the warp threads is generally not sufficient to ensure satisfactory functioning. It is therefore advantageous if, according to claim 10, the warp tensioning device has a single thread tensioner for each warp thread on the side where the warp thread and the shedding device interact. Thereby, the tension of each warp yarn is better adapted to each position of the warp yarn in the shed. The loom may have conventional additional crochet hooks. However, it is furthermore advantageous according to claim 11 if the thread tensioner is at the same time also designed as a hook thread.

According to claim 12, each warp thread is guided via two guide elements which are placed at a distance from each other and between which a thread tensioner acting on the warp thread is placed in order to exert a pretension on the warp thread. According to claim 13, the pretension can be produced by a tension weight. According to claim 14, it is further advantageous if the pretensioning is produced by a tension spring. This makes it possible in particular for the thread tensioner to be in an off-vertical position.

The thread tensioner may be provided with a closed thread eye. The design of claim 15 is however more advantageous, according to which each thread tensioner has a transverse thread eye (run-in eye). According to claim 16, each thread tensioner is provided with a guide opening, by means of which the thread tensioner is movably fixed in the direction of tension on the holder. Expediently, the thread tensioner is provided with a clamping section in the direction opposite to the pretensioning, which clamping section preferably has a signal section projecting in the displacement direction. The signal part may be, for example, a projecting tip of a yarn tensioner. Thus, a yarn tensioner in which a yarn is faulty can be found more easily, since it protrudes out of the plane of the yarn tensioner which is functioning properly.

It is particularly advantageous according to claim 17 if the thread tensioner is located on a holder which has an intermediate contact part projecting on one side thereof and which is embedded in a separate transverse contact part which cooperates with the side of the guide opening of the thread tensioner. When the warp tension is wrong, the contact part contacts with the end surface of the guide opening, and the contact makes the two connected, so that an error signal is triggered.

The yarn tensioner can be used in as many texturing looms as possible. However, it is preferably applied to a weaving machine according to claim 18, in which the control device of the warp thread tensioning device is connected to the drive of the piece goods take-up device in order to control the warp beam such that the warp threads as a whole are given a predetermined tension. The holding tension may be generated by a braking device on the let-off shaft. However, an embodiment according to claim 19 is more advantageous, according to which the beam is provided with a special drive comprising a self-engaging gear in order to generate the holding tension. The warp thread tensioning device is further improved according to the design of claim 20, according to which the loom back rest of the warp threads is pretensioned by means of a tension spring device. The tension spring device is connected to a control device, and the warp beam and the drive of the piece goods take-up device are controlled in order to maintain a predetermined tension in the rear beam of the weaving machine. The extension spring device can be of various alternative designs. The embodiment of claim 21 is particularly advantageous according to which the tension spring device comprises a leaf spring with a bending transducer which transmits a corresponding control signal to the control device. Furthermore, according to claim 22, the warp tensioning device may be designed as a safety device comprising an emergency switch and operatively connected to the loom back rest, the emergency switch being activated when the warp tension in the loom back rest is greater than the set tension by a predetermined safety amount.

Drawings

Exemplary embodiments of the invention will be described in more detail below with reference to the accompanying drawings, in which:

fig. 1 shows a side view of a weaving machine;

FIG. 2 shows an enlarged detail of the shedding apparatus of the weaving machine of FIG. 1;

FIG. 3 shows the opening device of FIG. 2 along line III-III;

FIGS. 4-8 show various stages of operation of the opening device of FIG. 2;

FIG. 9 shows a side view of another loom with a single yarn tensioner;

FIG. 10 shows an enlarged view of the yarn tensioner of the loom of FIG. 9; and

fig. 11 shows a detailed view of the device of fig. 10.

Detailed Description

The weaving machine shown schematically in fig. 1 generally has a warp-feed beam (warp-off) 2 designed as a warp beam, from which warp threads 4 run via a loom back beam 6, a single thread tensioner 8 and a crochet 10 to a shedding device 12. In the opening device 12, the warp threads 4 are opened to form a shed 14, into which a weft thread 16 is then introduced and beaten up at a beat-up edge 18, so that a cloth 20 is obtained. The piece of cloth 20 held by the cloth holder 22 is then taken up via a cloth take-up device 24. The control device 26 is used to control the weaving machine.

The weaving machine has a yarn tensioning device which essentially comprises a piece goods take-up device 24, the drive 28 of which is controlled by a control device 26 in order to give a predetermined tension which is applicable to all warp threads 4, which function at the same time also becomes a tension-maintaining function of the feed beam 2. The holding tension of the feed beam can be generated by means of a brake 29 or a special drive, wherein the motor is connected to the feed beam by a self-engaging gear. The warp tensioning device additionally comprises a single warp tensioner 8 for each warp thread 4, which is arranged between the two thread guiding elements 30 and in the embodiment shown is pretensioned individually by a pretensioning spring 32 on the warp thread 4 passing through the thread eye 34.

In the opening device 12, the warp threads 4 are pretensioned into a first shed position F between a deflection roller 36 and the cloth holder 22₁The latter may also be designed as an open-width roller. The first lifting device 38 is used for individual control of the warp threads 4 and has a drive 40 which can be moved from the switching position F by means of a lifting shaft 42₂Into a second shed position F₃. When the warp threads have been moved out of the first shed position F by the common second lifting device 48₁Into the switching position F₂The warp threads 4 are selectively brought into a position in which they cooperate with the drive 40, with the aid of a control element 46 controlled by an actuator 44, which is shown in detail in figures 1-8. The control element 46 contains a control dropper 50 which is pretensioned by a pretensioning spring 52 against a lifting shaft 54, so that the dropper 50 rests on the lifting shaft 54 via a stop 56. The actuator 44 includes a hook portion 58 that cooperates with a hook portion 60 on the control drop wire 50 and holds the control drop wire 50 in a raised position during the actuation phase. The deactivated actuator 44 causes the control drop wire 50 to move. In fig. 1, each control drop wire 50 is characterized by its transfer stroke, as shown in detail in fig. 2-8. As such, the control drop wire comprises a driver slot 62, which is located in the displacement stroke of the warp yarns 2. The driver slot and the control slot 64 are connected at their upper part, which control slot guides the warp thread out of the displacement travel of the driver into a widened guide slot 66, so that the warp thread is no longer caught by the driver 44.

As shown in fig. 2 and 3, the control drop wire is designed in the form of a sleeve and has side walls 68, 70 which are joined together by end walls 72, 74 to form a cavity in which the driver 40 is movably disposed. In particular, the driver grooves 62a, 62b are located in the side walls 68, 70 and are offset from the direction of yarn travel, and when the warp yarn passes the control drop, the warp yarn is inclined with respect to a plane perpendicular to the control drop by an angle α of less than 90 °, preferably 40 °, on the one hand in order to keep the resistance and wear on the warp yarn as low as possible when passing the control drop, and on the other hand in order to keep the wear on the control drop as low as possible.

The function of the opening device is described in more detail with reference to fig. 1 and 2-8. When the control drop wire is in the raised position, it is held on the actuator, which can be seen from fig. 1 and 2, 4 and 5, the actuator being located on the right in fig. 1, the warp threads being moved out of the guide groove 66 by the second lifting device 40, being transported via the inclined continuous side 76 back into the control groove 64 and, by means of the latter, into the driver groove 62, where they are in the displacement stroke of the driver 40. In the downward movement of the actuator 40, the warp threads 4 are moved out of the switching position F by the hooks 40a of the actuator 40₂Into a second shed position F in the lower shed position₃. The warp threads 4 are only in the switching position F as long as the drop wires 50 are controlled to remain in the raised condition₂And lower shed position F₃By as much as the reciprocating height H1, as is apparent from fig. 2 and 4-6.

As soon as the actuator 44 releases the control drop wire 50, which decreases by as much as the switching amount S, in the upward movement of the drive 40 the warp threads enter the widened guide slot 66 via the control slot 64 and subsequently move out of the displacement travel of the drive 40. Then, as seen in fig. 7 and 8, the warp threads again enter the displacement stroke of the second lifting device 48 and move over the height H₂Is moved back out of the switching position into a first shed position F located in the upper shed position₁。

Fig. 9 shows a weaving machine with a specially designed warp tensioning device and yarn tensioner, which weaving machine can have a shedding apparatus such as the weaving machine in fig. 1. The weaving machine comprises a warp beam 2a, from which warp threads 4 are guided via a weaving machine back beam 6a to a single thread tensioner 8a located upstream of a shedding device 12 a. Opening device 12a may be designed similarly to opening device 12 in the weaving machine of fig. 1, but may also be designed in other forms. The resultant cloth 20 is taken up by the cloth take-up device 24a and wound onto the cloth roll 80. The weaving machine comprises a control device 26a which is designed in particular to control the warp thread tensioning device. The beam 2a is actuated by a drive 82 with a self-engaging gear 84. The function of this drive, in particular as drive 28a of the piece goods take-up device 24a and as drive of the tension-adjusting spring device 86, is controlled by the control device 26a, by means of which the loom back rest 6a opposes the warp threads 4. Control is performed so that the cloth take-up device 24a is set to the holding force of the driver 82 of the warp beam 2a so that a predetermined tension can be maintained in the loom back beam 6 a.

The beam 6a is fixed to a rocker 88, the rocker 88 being supported via a support device 90 on a leaf spring 92 with a bending transducer 94, the bending transducer 94 transmitting its data to the control device 26 a. The support device 90 comprises a safety device 96 with a threaded rod 98, the top 100 of which is movably placed in a holding bell 102. Retaining bell 102 in communication with rocker 88. The top 100 is supported on a stop 104 that holds the bell. The pretensioned spring 106, which is outside the retaining bell 102, is supported on the screw 98 via a fastening screw 108 on the one hand and on the retaining bell 102 via a washer 110 on the other hand, so that the top 100 is subjected to a corresponding pretensioning tension against the stop 104 of the retaining bell 102. The screw 98 is further connected to the leaf spring 92. Then, if a tension higher than the preset tension allowed in the leaf spring 92 is generated in the loom back beam 6a, the pre-tensioning spring 106 is compressed and the holding bell 102 moves onto the screw 98, thereby generating the closure of the switch 112 associated with the holding bell 102 and transmitting an error signal to the control device 26 a.

Fig. 10 and 11 show the structure of the thread tensioner 8a in detail, which is also designed as a crochet. The thread tensioners 8a are designed as drop wires and each have a guide opening 114, by means of which they are movably fixed in the drawing direction on a holder 116. The holder has a central contact part 118 protruding on one side, which central contact part 118 is embedded in a separate lateral contact part 120. The latter being connected to the side of the pilot port. In the event of a warp thread tension error, the thread tensioner 8a is moved by means of the pretensioning spring 32a until the contact elements 118, 120 on the holder 116 oppose the end face 124 of the guide opening 114 and trigger an error warning. The thread tensioner is in each case located between two guide elements 30a of the warp threads 4, which form (thread up to) the thread tensioner 8a by means of a thread eye 34 a. On the side facing away from the pretensioning spring 32a, each thread tensioner comprises a clamping part 126 with a signal part 128, the clamping part 126 protruding out of the plane of movement of the thread tensioner in order to be able to find those thread tensioners which show a breakage of a warp thread and for this reason are no longer in line with the remaining signal part 128. The signal portion 128 is formed by a top portion protruding from the displacement plane.

List of reference numerals

F₁First shed position 54 lift shaft

F₂Shift position 56 stop

F₃Hook-shaped part 44 of second shed position 58

60 hook portion 50

H₁Lift height 62 driver slot for first lift device

62a driver slot

H₂Lifting height 62b driver slot of second lifting device

64 control slot

S conversion 66 guide groove

Alpha offset angle 68 sidewall

70 side wall

2, 2a warp beam (beam) 72 end wall

74 end wall

4 warp yarn 76 continuous side

6, 6a loom back beam 80 cloth rolling shaft

8, 8a yarn tensioner 82 drive

10 thread catcher 84 self-closing gear

12, 12a opening device 86 tension adjustment spring device

14 shed

16 weft 88 rocker

18 beat-up edge 90 support apparatus

20 cloth 92 leaf spring

22 cloth holder 94 bend converter

24, 24a piece goods take-up device 96 safety device

26, 26a control device 98 screw

28, 28a driver 100 top

29 brake 102 holding bell jar

32, 32a pre-tensioning spring 106 pre-tensioning spring

34, 34a thread eye 108 fixing screw

36 deflector roll 110 washer

38 first lifting device 112 switch

40 driver 114 pilot port

40a hook 116 holder

42 lift shaft 118 contact feature

44 actuator 120 lateral contact member

46 control element

48 second lifting device 124 end face

50 control drop wire 126 clamping part

52 pretensioning spring 128 signal portion

Claims

1. A weaving machine with a warp tensioning device and a shedding apparatus (12, 12a) in which the warp threads (4) are pretensioned into a first shed position (F)₁) There is also a first lifting device (38) which can be driven in a pivoting manner and has a drive (40) for the warp threads (4), and which, in order to selectively bring the warp threads (4) into a position in which they cooperate with the drive (40), then moves the warp threads (4) into a second shedding position (F)₃) The weaving machine further comprises a control element (46) actuated by an actuator (44), characterized in that for moving the warp threads (4) from the first shed position (F)₁) Out of and into a switching position (F) effective for the first lifting device (38)₂) And for jointly moving non-selected warp threads into a first shedding position (F) as a result of the warp threads (4) being pretensioned₁) The weaving machine has a common second lifting device (48) for all warp threads (4).

2. Weaving machine according to claim 1, characterized in that the second lifting device (48) is designed as a lifting shaft which passes through all warp threads (4).

3. Weaving machine as claimed in claim 1, characterized in that the second lifting device (48) performs at least half (H) of the lifting stroke of the warp thread in the shed₂)。

4. Weaving machine as claimed in claim 1, characterized in that the first lifting device (38) has a control drop wire (50) for each warp thread with a driver slot (62, 62a, 62b) and an associated driver (40, 40a) for the associated warp thread (4), which can be brought selectively into engagement with the driver (40, 40a) by means of the control drop wire (50) controlled by the actuator (44).

5. Weaving machine according to claim 4, characterized in that the drop wires are designed in the shape of a hook.

6. Weaving machine according to claim 4, characterized in that the driver groove (62, 62a, 62b) is located in the displacement stroke of the driver (40, 40a) and is guided in the switching region via a control groove (64) which is arranged obliquely with respect to the displacement direction of the driver, out of the displacement stroke of the driver (40, 40a) into a widened guide groove (66) of the control drop wire.

7. Weaving machine according to claim 6, characterized in that the guide groove (66) is formed with a continuous side (76) facing the control groove (64).

8. Weaving machine as claimed in claim 6, characterized in that the control drop wire (50) is designed in the form of a sleeve with two side walls (68, 70), between which side walls (68, 70) the drive (40, 40a) is movably mounted.

9. Weaving machine according to claim 8, characterized in that at least the driver groove (62a, 62b) and the control groove (64) are formed in two side walls (68, 70), and in that the driver groove (62, 62a) and the control groove (64) in the side walls (68, 70) deviate from each other in the transport direction of the warp threads (4) by an angle α of less than 90 ° from the transport direction of the warp threads in the control drop wire (50).

10. A weaving machine as claimed in claim 9 wherein the angle of deviation is 10 °.

11. Weaving machine according to any one of claims 4-10, characterized in that all drives (40) of a row are moved up or down by means of a common lifting shaft (42).

12. Weaving machine as claimed in claim 1, characterized in that the warp tensioning device has a single thread tensioner (8, 8a) for each warp thread (4) on the side where the warp thread (4) and the shedding apparatus (12, 12a) interact.

13. Weaving machine according to claim 12, characterized in that the thread tensioner (8a) is designed as a crochet.

14. Weaving machine as claimed in claim 12, characterized in that each warp thread (4) is guided via two guide elements (30, 30a) which are placed at a distance from each other and between which a thread tensioner (8, 8a) acting on the warp thread is placed, exerting a pretension on the warp thread.

15. Weaving machine according to claim 14, characterized in that the pretensioning is produced by a tension weight.

16. Weaving machine according to claim 14, characterized in that the pretension is produced by a tension spring (32, 32 a).

17. Weaving machine as claimed in any one of claims 12 to 16, characterized in that each thread tensioner (8a) has a transverse warp threading eye (34a) for a warp thread (4).

18. Weaving machine according to any one of claims 12 to 16, characterized in that each thread tensioner (8a) is provided with a guide opening (114) by means of which the thread tensioner is movably fixed in the direction of tension on a holder (116), the thread tensioner being provided with a clamping part (126) in the direction opposite to the pretensioning.

19. Weaving machine according to claim 18, characterized in that the clamping part has a signal part (128) which projects in the displacement direction.

20. Weaving machine according to claim 18, characterized in that the holder (116) has an intermediate contact element (118) projecting on one side and engaging in a separate transverse contact element (120) and cooperating with the side of the guide opening (114) of the thread tensioner, the intermediate contact element (118) and the transverse contact element (120) communicating with one another via the end face (124) of the guide opening (114) in the event of a warp thread tension error, thus triggering an error signal.

21. Weaving machine according to claim 1, characterized in that for controlling the drive (28, 28a) of the piece goods take-up device (24, 24a) as a function of the holding tension of the warp beam (2, 2a), the control device (26, 26a) of the warp thread tensioning device is connected to the drive (28, 28a) of the piece goods take-up device (24, 24a) so that the warp threads as a whole are brought to a predetermined tension.

22. Weaving machine according to claim 21, characterized in that for the generation of the holding tension the warp beam (2a) is provided with a special drive (82) comprising a self-engaging gear (84).

23. Weaving machine according to claim 21 or 22, characterized in that the warp thread tensioning device has a weaving machine backrest (6a) for the warp threads (4), which weaving machine backrest is pretensioned by means of a tension spring device (86), which tension spring device (86) is connected to the control device (26a) in such a way that the warp beam (2a) and the drives (82, 28a) of the piece goods take-up device (24a) are controlled in order to maintain a predetermined tension in the weaving machine backrest (6 a).

24. Weaving machine according to claim 23, characterized in that the tension spring device (86) comprises a leaf spring (92) with a bending transducer (94) which is connected to the control device (26 a).

25. Weaving machine according to claim 23, characterized in that the tension spring device (86) is connected to the weaving machine back rest (6a) by means of a safety device (96) with an emergency switch (112), which emergency switch (112) is activated when the tension of the warp threads (4) at the weaving machine back rest (6a) is greater than a set tension by a predetermined safety amount.