Ribbon needle loom

Abstract

In order to improve the design of a ribbon needle loom for applications in which the woven material (9) shall have a variable width, it is proposed to arrange the weft needle (10, 16) and also the knitting needle (10b, 16b) serving to knit the weft thread (14, 15) at the side directed away from the weft insertion onto a common, displaceable carrier (10c, 16c). As a further improvement, in order to be able to produce symmetrical woven material (9) with such a ribbon needle loom, a bilateral weft-insertion is proposed, wherein the two weft needles (10, 16) and the two knitting needles (10b, 16b) by means of which the respective weft thread (14, 15) is knitted at the side directed away from the weft insertion are each disposed on a common, displaceable carrier (10c, 16c). Advantageously, the carriers (10c, 16c) do not hinder each other upon displacement, but rather are arranged on top of each other.

Claims

1. A ribbon needle weaving loom comprising a weave point, at which warp threads are interweavable to each other by means of at least one weft thread, a device for feeding the warp threads, a device for feeding the at least one weft thread, further comprising a shed forming device for forming a shed from the warp threads, and comprising at least one weft thread insertion needle for inserting a weft thread loop into the shed, and comprising a reed for beating up the weft thread loop and comprising at least one knitting device serving to knit the at least one weft thread at the side directed away from the weft insertion, characterized in that the at least one weft thread insertion needle and the at least one knitting device are arranged on a common carrier which is displaceable in and against the weft direction (x).

2. The ribbon needle weaving loom according to claim 1, characterized in that there are provided two weft thread insertion needles being countercurrently introducible into the shed for inserting two weft thread loops into the shed, and two knitting devices, by means of which a respective weft thread is knittable at the respective side directed away from the weft insertion, one weft thread insertion needle and one knitting device each being arranged on a respective common carrier which is displaceable in and against the weft direction (x).

3. The ribbon needle weaving loom according to claim 2, characterized in that the two carriers with their associated weft thread insertion needles and knitting devices are arranged in such manner that the carriers with their associated weft thread insertion needles and knitting devices are displaceable independently to each other, by means of a height staggering of the carrier.

4. The ribbon needle weaving loom according to claim 1, characterized in that the reed has, in the upper region thereof, a respective distance between reed teeth which is different than in the lower region thereof, and that the reed is furthermore displaceable in its height for beating up the woven material of variable width.

5. The ribbon needle weaving loom according to claim 4, characterized in that the reed is displaceable in both the height and in or against the weft direction (x).

6. The ribbon needle weaving loom according to claim 1, characterized in comprising electromechanic actuating drives for displacement of the carrier or the carriers, respectively.

7. The ribbon needle weaving loom according to claim 5, characterized in comprising electromechanic actuating drives for displacement of the reed in the height and also laterally in or against the weft direction (x).

8. The ribbon needle weaving loom according to claim 6, characterized by a control unit for controlling the said electromechanic actuating drives.

9. The ribbon needle weaving loom according to claim 2, characterized in that the reed has, in the upper region thereof, a respective distance between reed teeth which is different than in the lower region thereof, and that the reed is furthermore displaceable in its height for beating up the woven material of variable width.

10. The ribbon needle weaving loom according to claim 9, characterized in that the reed is displaceable in both the height and in or against the weft direction (x).

11. The ribbon needle weaving loom according to claim 3, characterized in that the reed has, in the upper region thereof, a respective distance between reed teeth which is different than in the lower region thereof, and that the reed (20) is furthermore displaceable in its height for beating up the woven material of variable width.

12. The ribbon needle weaving loom according to claim 11, characterized in that the reed is displaceable in both the height and in or against the weft direction (x).

13. The ribbon needle weaving loom according to claim 9, characterized in that the reed is displaceable in both the height and in or against the weft direction (x).

14. The ribbon needle weaving loom according to claim 11, characterized in that the reed is displaceable in both the height and in or against the weft direction (x).

15. The ribbon needle weaving loom according to claim 2, characterized in comprising electromechanic actuating drives for displacement of the carrier or the carriers, respectively.

16. The ribbon needle weaving loom according to claim 3, characterized in comprising electromechanic actuating drives for displacement of the carrier or the carriers, respectively.

17. The ribbon needle weaving loom according to claim 4, characterized in comprising electromechanic actuating drives for displacement of the carrier or the carriers, respectively.

18. The ribbon needle weaving loom according to claim 5, characterized in comprising electromechanic actuating drives for displacement of the carrier or the carriers, respectively.

19. The ribbon needle weaving loom according to claim 6, characterized in comprising electromechanic actuating drives for displacement of the reed in the height and also laterally in or against the weft direction (x).

20. The ribbon needle weaving loom according to claim 7, characterized by a control unit for controlling the said electromechanic actuating drives.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further details, advantages and features of the object of the present invention will become apparent from the following description and the corresponding drawings, in which ribbon needle weaving looms and their weft thread insertion units according to the present invention are illustrated by way of example. In the drawings there are shown in:

(2) FIG. 1a a weft thread insertion unit of known type, in which the weft head is fixed while the reed and the knitting needle are displaceable according to the desired bandwidth, in the operating mode of the wide ribbon;

(3) FIG. 1b the tension ratios of the weft thread according to FIG. 1a;

(4) FIG. 1c the weft thread insertion unit of known type according to FIG. 1a, in the operating mode of the narrower ribbon;

(5) FIG. 1d the tension ratios of the weft thread according to FIG. 1c, wherein the weft thread transport speed is maintained;

(6) FIG. 1e the tension ratios of the weft thread according to FIG. 1c, at reduced weft thread transport speed;

(7) FIG. 2 a 3D representation of the weft thread insertion unit according to an exemplary embodiment of the present invention with weft thread insertion from the left;

(8) FIG. 2a the representation of the weft thread insertion according to FIG. 2;

(9) FIG. 3 a 3D representation of the weft thread insertion unit according to an exemplary embodiment of the present invention with weft thread insertion from the right;

(10) FIG. 3a the representation of the weft thread insertion according to FIG. 3;

(11) FIG. 4a a weft thread insertion unit according to FIG. 2, in which the weft head is coupled with the knitting needle and the reed is displaceable in accordance with the desired bandwidth, in the operating mode of the wide ribbon;

(12) FIG. 4b the tension ratios of the weft thread according to FIG. 4a;

(13) FIG. 4c the weft thread insertion unit of known type according to FIG. 4a, in the operating mode of the narrower ribbon;

(14) FIG. 4d the tension ratios of the weft thread according to FIG. 4c, wherein the weft thread transport speed is maintained;

(15) FIG. 4e the tension ratios of the weft thread according to FIG. 4c, at reduced weft thread transport speed;

(16) FIG. 5 a 3D representation of the weft thread insertion unit according to an exemplary embodiment with two-sided weft insertion from the left and from the right, when the ribbon becomes wide;

(17) FIG. 6 a 3D representation of the weft thread insertion unit according to an exemplary embodiment with two-sided weft insertion from the left and from the right, when the ribbon becomes narrow;

(18) FIG. 7a a representation of the height staggering according to the exemplary embodiment of FIGS. 5 and 6, from the front

(19) FIG. 7b a representation of the height staggering according to the exemplary embodiment of FIGS. 5, 6 and 7a, from above;

(20) FIG. 8a the representation of the carrier- and reed position according to the exemplary embodiment of FIGS. 5, 6, 7a and 7b with symmetrical bandwidth variation, with a wide band;

(21) FIG. 8b the representation of the carrier- and reed position according to the exemplary embodiment of FIGS. 5, 6, 7a and 7b with symmetrical bandwidth variation, with a narrow band;

(22) FIG. 9a the representation of the carrier- and reed position according to the exemplary embodiment of FIGS. 5, 6, 7a and 7b with asymmetrical bandwidth variation, with a wide band;

(23) FIG. 9b the representation of the carrier- and reed position according to the exemplary embodiment of FIGS. 5, 6, 7a and 7b with asymmetrical bandwidth variation, with a narrow band.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

(24) In FIGS. 2 and 3, there is shown a simple embodiment of the present invention by means of the essential elements. In FIG. 2, the weft thread insertion is provided from the left by the weft thread insertion needle 10, wherein the weft thread insertion needle 10 and the (first) knitting needle 10b, by means of which the weft thread 14 is enmeshed after weft thread insertion, is arranged on a common carrier 10c, which is displaceable in and against the weft thread insertion direction x, and the weft thread insertion needle 10 is driven by means of a toothed pulley drive 34 of a rotary actuator 30. It should be emphasized that a drive through the main shaft of the weaving loom is nonetheless possible and practically equivalent. In FIG. 2a, there is schematically shown the process of weft thread insertion from above. The axis 11 of the weft thread insertion needle 10 or its pivot bearing and associated knitting needle 10b or its linear bearing are firmly connected to each other by means of bracket 32. An additional drive moves the knitting needle 10b in the y direction (direction of the warp thread) back and forth to pick the weft thread and to enmesh it with the previous weft. This additional drive and the enmeshing process, respectively, are not shown here. In FIG. 2a, there is shown the time point of the beat-up of the reed 20, at which the weft thread insertion needle 10 has moved out of the shed 8, the reed 20 beats up the weft at the woven material 9 and the knitting needle 10b is drawn before the reed beat-up point.

(25) In FIGS. 4a to e, the weaving process is explained by means of the tension ratio of the weft thread over the weaving phase (0-360°) in accordance with or in contrast to FIGS. 1a to 1e. In FIG. 4a, the situation is shown, in this case with weft thread insertion from the left, when the maximum bandwidth is woven. The reed 20 is lowered. The knitting needle 10b is positioned maximally to the right, the weft axis is arranged at a constant distance amount a to the left thereof. In contrast, FIG. 4c shows weaving with the minimum bandwidth. The reed 20 is raised maximally. The knitting needle 10b is positioned maximally to the left, the weft thread axis is at a constant distance a. The weft thread tension at the reed beat-up increases because the weft thread is pulled further to the left by the weft needle. The ratio of the sum of the line segment A-B-D to the line segment A-D is increased. By reducing the weft transport speed, the weft thread tension at the reed beat-up can again adjusted to the same value as in the case of the wide ribbon, without increasing the maximum weft thread tension.

(26) In the aforementioned exemplary embodiment both a symmetric and also an asymmetric bandwidth variation can be set, as will be explained with reference to FIGS. 8a, 8b (symmetric bandwidth variation) and 9a, 9b (asymmetric bandwidth variation).

(27) In FIGS. 5 to 9b, there is described a second exemplary embodiment with two-sided weft insertion from the left and from the right. FIG. 5 shows a device when the ribbon (woven material 9) is wide. The reed 20 is lowered, the weft heads are positioned in mutual contact. In FIG. 6 it is shown accordingly that the ribbon is made narrow. The reed 20 is raised, the weft heads have positioned apart from each other. Otherwise, the device is practically a combination of the devices according to FIGS. 2 and 3. However, it should be noted that the two device components shall not interfere with each other. The solution for this is shown in FIGS. 7a and 7b, namely a height staggering of the associated device parts insofar as they could interfere with each other.

(28) If the weft insertion shall occur from the right and from the left, the connecting brackets 32 and 33 including the associated components—knitting needles 10b and 16b, weft needles 10 and 16, driving motors 30 and 31—should be arranged staggered in height. Moreover, they shall leave enough space so that the weft needles/weft levers can carry out their pivotal movement unhindered. The drive of the weft axes again occurs, by way of example, by means of a toothed pulley drive from a respective servo motor 30 and 31, which transmit their rotational movement to a respective toothed pinion on the weft axes.

(29) In FIG. 8a, the reed is in the lowest z position, so that the warp threads at the reed beat-up point are spread apart maximally and, consequently, the bandwidth becomes maximal. The two weaving heads with their associated knitting needles are positioned in x direction in such manner that the bandwidth becomes maximal. In FIG. 8b, the reed is in the uppermost z position, so that the warp threads 4 at the reed beat-up point are maximally spread and, thus the bandwidth becomes maximal. The two weaving heads with their associated knitting needles 10b and 16b are spaced apart from each other in x direction by the same path so that the bandwidth becomes maximal.

(30) In FIG. 9b, the reed has been displaced relative to the starting position both into the uppermost z position and also to the left. In this manner, the left ribbon edge is left at the same position, but the right one is displaced in x direction by the distance amount f.

(31) The weaving head for the weft insertion from the right, together with the associated knitting needle 16b, have remained at the same position as shown in FIG. 9a, whereas the weaving head for the weft insertion from the left, together with the associated knitting needle 10b, have been displaced in x direction by the distance amount f.

LIST OF REFERENCE NUMERALS

(32) 3 thread guide 4 warp threads 8 shed 9 woven material with variable width 10 weft thread insertion needle for weft-thread insertion from the left 10b knitting needle for weft-thread insertion from the left 10c carrier for the weft thread insertion needle and the knitting needle for weft-thread insertion from the left 11 axis of the weft thread insertion needle for weft-thread insertion from the left 13 axis of the weft thread insertion needle for weft-thread insertion from the right 14 weft thread for weft-thread insertion from the left 14a weft thread guide for weft-thread insertion from the left weft thread for weft-thread insertion from the right 15a weft thread guide for weft-thread insertion from the right weft thread insertion needle for weft-thread insertion from the right 16b knitting needle for weft-thread insertion from the right 16c carrier for the weft thread insertion needle and the knitting needle for weft-thread insertion from the right 20 reed 21 reed teeth 30 rotary actuator for weft-thread insertion from the left 31 rotary actuator for weft-thread insertion from the right 33 connecting bracket for weft-thread insertion from the left 32 connecting bracket for weft-thread insertion from the right 34 toothed pulley drive x weft direction y direction of the warp thread z direction perpendicular to the woven material