EP0799339B1 - Ribbon loom - Google Patents

Abstract

The ribbon loom comprises a weft insertion needle (12) to insert a loop of weft thread (4) into a shed (8). The weft thread loop is tied off by a knitting needle (18) on the side of the web (16) away from the insertion needle (12). The insertion needle (12) is served by a feed device (22) for the weft thread (20) containing a pneumatically operated compensator (32) in the form of a blower (36) and/or a suction device (38). The insertion needle (12) also has a separate guide eye (34) for the weft thread. This thus provides a particularly effective compensator ensuring precise control of the weft thread when the ribbon loom is running at high speed. The web edges are always tensioned to the set width and maintained at a constant width.

Description

Technical field

The invention relates to a ribbon loom according to the preamble of claim 1.

State of the art

Ribbon looms of the type mentioned are in many Form known, for example from GB-B-2 039 547. The ribbon loom contains a weft insertion needle, the a weft feeder is associated with -in Seen the direction of the weft - a weft source, a weft brake, a weft conveyor and has a weft compensation device. The weft compensation device is formed by a leg spring between a first and a second position back and forth. In the first position the leg spring gives the weft to insert one Weft thread loop into a by means of the weft insertion needle Shed free. When extending the weft insertion needle from the The shed spring takes up the second position in the shed who takes up a weft supply and finally that Weft in a gap formed with a leaf spring jammed to prevent further funding. At The weft thread is re-entered into the shed Weft thread tensioned again and the leg spring out of the second moved to the first position, while the Weft thread is released from the jamming leaf spring. This Compensation device has the disadvantage that it is relative is sluggish, so a tape loom equipped with it is limited in its drive speed, in particular also the insertion and removal of the weft thread on the braking end Leaf spring the performance of the ribbon loom further limited.

Ribbon looms with such mechanical balancing devices have the disadvantage that in their performance, that means that the maximum speed is limited to 2,500 rpm. If such a ribbon loom is operated at a higher speed, this creates serious problems. The leg springs can break and / or come in critical Vibration range in which the tension of the weft can no longer be controlled. Natural vibrations and Mass forces require a higher spring force, the greater can be considered the tensile strength of the weft to be processed. As a result of the necessary greater leg spring force the service life of the tongue knitting needles drops to 1/2 Hour. Furthermore, the weft thread tension is too high a strong weaving of the tapes to be produced and the tape cannot be kept at a constant width, the belt especially when starting the belt loom is narrower. Further broken wire breaks occur as As a result of the excess weft tension required.

With conventional ribbon looms, everyone is used today Mesh edge types with tongue knitting needles, also tongue needle called, manufactured. Such tongue knitting needles are only up suitable for speeds of 2,500 rpm. At higher speeds breaks occur on the hooks and tongues as a result of high acceleration when turning the tongues. The downtimes the tongue knitting needles at speeds of 2,500 to 4,000 rpm approximately 1 to 4 hours, which in the Practice is not acceptable.

From FR-A-2 368 561 and US-A-3 502 253 are each pneumatic compensation devices for weft threads for unprotected weaving machines are known in which from a weft supply one weft thread in each case via a supplying plant deducted and a pneumatic compensation device is fed. In the latter, the is continuously fed Weft formed into a supply loop from which the weft thread length required for each weft insertion Weft entry is deducted periodically. For this, the is off the compensation device coming weft over a controlled clamping device to a blowing nozzle, which a weft section into at the appropriate moment blows in an open shed. The length of the blown weft section is determined by the opening time of the Clamping device. The weft thread entry is closed interrupted the clamping device and the registered weft section (Single shot) is by means of a cutting device separated from the weft. The clamping device serves both to control the weft thread section to be entered how to prevent weft retraction from the blow nozzle between two entry processes. A such weft feed is for a ribbon loom a weft insertion needle obviously completely unsuitable. With such a needle ribbon weaving machine, the weft thread closes no time cut into sections but is continuous connected to the fabric to be manufactured and is in shape a weft loop (double weft) is inserted into the shed and tied on one side of the fabric by means of a knitting needle. The clamp would not only be practical prevent uninterrupted weft thread transport to the fabric, but especially the one for tensioning the weft thread and necessary to form a perfect effective edge Withdrawal of the weft.

Presentation of the invention

The object of the invention is a ribbon loom of the beginning mentioned type so that they have a higher Performance enables.

The object is achieved according to the invention by the characterizing Features of claim 1.

Because the compensation device works pneumatically is designed as a blowing and / or suction device, results a ribbon loom, its weft compensation device is practically massless or towards the mass of the treating weft is limited. The tension of the Weft thread can be absolutely constant and at its lowest Value are maintained, this voltage being preferred by adjustable components of the feeder through the weft material and / or the weaving conditions can be subtly adapted to the given conditions. So that retraction tension required for a perfect ribbon loom for the inserted weft loop adhered to and the magnitude of the voltage by a preferred adjustable guide eye can be regulated. This opens up new dimensions for the performance of a ribbon loom, which is now in contrast to the well-known ribbon looms with a much higher speed of, for example 3,000 to 6,000 rpm can be operated.

Advantageous embodiments of the ribbon loom are in the Claims 2 to 14 described.

A configuration according to claim is particularly advantageous 2, whereby the weft thread is stretched by means of the guide eyelet can be set according to claim 12.

With regard to the compensation device, there are various Training opportunities, which is particularly advantageous after Claim 3, because through the chamber exact guidance of Weft thread is guaranteed, so that the action of the air flow on the weft is precisely determined and controlled can be. A preferred training of the chamber is described in claim 4. Continuing education according to claim 5 improves the monitoring of the weft in the Chamber.

Claim 6 describes a further possibility of configuration the compensation device.

The configurations of the ribbon loom according to claims 7 up to 9 contribute to a more subtle control of the weft and thus the adaptation to the thread quality on the one hand and the weaving conditions on the other hand. The feeder for the weft thread is advantageous according to claim 10 adjustable so that the weft thread both when extended as stretched when the weft insertion needle is retracted. This will not only be the one when inserting the weft thread required weft supply kept particularly small, but there are also any vibrations of the weft thread prevented during the entry cycle, which is a burden represent for the weft and the weaving process would affect. According to claim 11, the stretching of the weft thread when the weft insertion needle is retracted and extended preferably by means of the weft conveyor set. The setting of the extension of the Weft thread with the weft insertion needle extended and retracted is preferably carried out by means of the guide eyelet According to claim 12, the selvedges are always on the set bandwidth tense and to exactly constant Kept wide.

To tie the weft thread loop after its entry in the shed can up to the usual speeds today (up to 3'000 rpm) of the ribbon weaving machines the most different knitting needles used, for example the usual Switch needles and crochet needles. For high-speed ribbon looms provides the slider knitting needle, short slider needle called according to claim 13 practically the only structural element which is not only a perfect function enables but also offers the required service life. Since the pusher needle has no tongue, the associated are Problems completely eliminated. By arranging with common pivot axis according to claim 14 for the beacon and the slide part enables an exact run of both parts. The wear is practically complete eliminated. The two parts can also be very precisely adjust to each other and the value set once remains constant during the operation of the ribbon loom receive. The security of the weft thread and one any auxiliary thread is flawless at the highest speed given because the needle is inevitably opened and is closed. It is particularly advantageous if the Slide needle is designed according to claim 15.

Brief description of the drawing

Figur 1

die Schussfaden-Zuführvorrichtung einer Bandwebmaschine in der Darstellung nach Art eines Blockdiagrammes bei ausgefahrener Schusseintragsnadel;

Figur 2

die Schussfaden-Zuführvorrichtung der Figur 1 mit abgewandelter Wirknadel und bei beginnendem Eintrag des Schussfadens;

Figur 3

die Schussfaden-Zuführvorrichtung der Figur 2 bei eingetragener Schussfadenschlaufe;

Figur 4

eine erste Schussfaden-Ausgleichsvorrichtung in schematischer Darstellung;

Figur 5

eine zweite Schussfaden-Ausgleichsvorrichtung in schematischer Darstellung;

Figur 6

eine dritte Schussfaden-Ausgleichsvorrichtung im Schnitt quer zur Laufrichtung des Schussfadens;

Figur 7

die Schussfaden-Ausgleichsvorrichtung der Figur 6 im Schnitt VII-VII der Figur 6;

Figur 8

eine Schiebernadel-Vorrichtung in Seitenansicht;

Figur 9

den Kopf der Schiebernadel in geöffnetem Zustand, im Schnitt längs des Schiebers und in grösserem Massstab;

Figur 10

den Kopf der Schiebernadel gemäss Figur 9 in geschlossenem Zustand; und

Figur 11

den Kopf der Schiebernadel der Figur 9 im Schnitt XI-XI der Figur 9.

Exemplary embodiments of the ribbon loom according to the invention are described in more detail below with the aid of schematic drawings, in which:

Figure 1

the weft feed device of a ribbon loom in the manner of a block diagram with the weft insertion needle extended;

Figure 2

the weft feeder of Figure 1 with a modified knitting needle and at the beginning of the insertion of the weft;

Figure 3

the weft feeder of Figure 2 with the weft loop inserted;

Figure 4

a first weft compensation device in a schematic representation;

Figure 5

a second weft compensation device in a schematic representation;

Figure 6

a third weft compensating device in cross-section to the direction of the weft;

Figure 7

the weft compensation device of Figure 6 in section VII-VII of Figure 6;

Figure 8

a slide needle device in side view;

Figure 9

the head of the slide needle in the open state, in section along the slide and on a larger scale;

Figure 10

the head of the slide needle according to Figure 9 in the closed state; and

Figure 11

the head of the needle of Figure 9 in section XI-XI of Figure 9.

Ways of Carrying Out the Invention

Figures 1 to 3 show essential components of a Ribbon loom in the form of a block diagram in different operating states of the weft insertion needle. The ribbon loom has a reed 2, which a weft loop 4 which is formed in a warp thread 6 Shed has been entered on a product edge 10 strikes. A is used to insert the weft thread loop 4 Weft insertion needle 12 which is crescent-shaped and around an axis 14 is pivotable back and forth. On the the Entry side on which the weft insertion needle 12 is arranged is, opposite side of the web 16, that is, the manufactured ribbon, a knitting needle 18 is arranged, the serves to tie the weft loop 4. In Figure 1 is the knitting needle is designed as a latch needle and in the figures 2 and 3 as a slide needle 18a, which is based on FIGS 11 is further explained below.

The weft insertion needle 12 becomes a weft 20 by means of fed to a feed device 22. This points in the running direction seen the following components of the weft. A weft bobbin, for example, serves as the weft source 24 of which the weft 20, for example, over an adjustable thread brake 26 to a conveyor 28 arrives, the weft 20 with adjustable speed continuously promotes. From there the Weft thread over a preferably optically designed Weft monitor 30 to a pneumatically operating compensation device 32 and further via a position adjustable Guide eye 34 to the weft insertion needle 12. Instead of shown ballast can the weft monitor of the compensation device 32 can also be connected downstream. The pneumatic Compensating device 32 has a blowing device 36 and / or suction device 38, which with the Weft thread interacts or act. The blowing device 36 contains a blow nozzle 40 which is connected via a line 42 to a Blower device 44 is connected, which is a compressed air 45 generated. The suction device 38 with a suction nozzle is analogous 46 equipped via a line 48 with the suction side a blower device 50 is connected and suction air 49 generated. In Figure 1, the compensation device 32nd both with a blowing device 36 and with a suction device 38, wherein the suction air 49 through aspirated ambient air 51 is formed. In Figures 2 and 3, only one suction device 38 is used is described in more detail with reference to FIGS. 6 and 7.

The pneumatic compensation device 32 serves on the one hand the inclusion of a weft thread reserve, which is caused by the intermittent weft withdrawal when inserting the Weft loop in the shed. On the other hand, the Compensating device also to the weft for the Entry of the weft loop into the shed required To impart tension.

In Figure 1, the weft insertion needle is in the extended position in which the weft thread between the Goods edge 52 and the guide eye 34 a retraction loop 54 forms for tightening the knitting loop 56. In this stadium also the weft thread loop entered in the shed 8 4 struck on the goods edge 10. As from Figure 2 emerges, begins to swing back the reed 2 at the same time the entry movement of the weft insertion needle 12. In Figure 2 is the position of the weft insertion needle shown how this the guide eyelet 34 before entering the weft loop happens, the components of the Feed device and in particular the compensation device 32 are set so that the weft thread between the Guide eye 34 and the goods edge 52 runs in a straight line, the excess length of the weft thread from the compensation device 32 is included. Dashed indicates how the weft course would be 58 if not sufficient Weft thread tension would be present. The conveyor 28 is set so that at this stage in the compensation device 32 has formed a weft thread supply 60, during the insertion of the weft thread loop shown in FIG. 3 is used up in the shed. At the in FIG. 3 shows the weft insertion needle Weft thread loop 4 entered in the shed 8, namely in such a way that the weft thread for stitch formation when Tying the weft thread loop inserted into the knitting needle 18a is. Here too are the components, especially those Compensation device 32 of the feed device 22 set so that the weft loop with straight legs 62.64 lies in the shed 8. While extending the Weft insertion needle 12 from the shed 8 does not become a weft thread 20 needed. The constant working conveyor 28, on the other hand, continuously delivers weft thread, which of the Compensation device added as weft supply 60 and is kept ready for the next firing cycle.

The individual components of the feed device 32 can by means of a suitable control device, not shown, which can contain a computer, on top of each other be coordinated.

FIG. 4 shows a blower device 36 Compensating device 32, in which the blowing nozzle 40 on the Weft thread 20 acts between 66.68 between two guides is performed in a flat chamber analogous to that in the Figures 6 and 7 shown chamber 82 can be arranged.

FIG. 5 shows a further compensation device 32a, at the weft thread 20 is guided in a channel section 70 is, in which a blowing nozzle 72 opens, namely under one such an angle that the blowing air flow 74 against the direction of travel 76 of the weft is directed. The weft can then have a weft supply 78 between the end of the Form channel section 70 and a guide 80.

Figures 6 and 7 show those used in Figures 1 to 3 Compensating device 32, which acts as a suction device 38 is trained. For this purpose, the suction device contains a flat chamber 82, a weft feeder on a narrow side 84 86 and a weft thread removal on the other narrow side 88 has. The width B of the chamber is preferably dimensioned so that it is equal or smaller than 50 times the thickness D of the weft thread 20. The length C of the Chamber is larger than the width B. The flat chamber 82 of the Suction nozzle 46 merges into line 48. Chamber 82 is on equipped with a weft monitor 90 on the open side, that by means of a monitoring beam 91 of a diode in the direction of flow 92 of the suction air flow points around the Monitor weft 20 or a weft supply 60. Sucking is carried out using a known, not shown Suction pump.

FIGS. 8 to 11 show a slide needle device, their basic structure, for example from CH-PS 644 163 is known. The slide needle 18a consists of a Needle head 94 with a hook 96 attached to a hollow needle shaft 98 is arranged. The latter is on a hook lever 100 attached, which is connected to a hollow shaft 102, which carries out the required swiveling movement. The slide needle contains the one guided through the hollow shaft 98 Slide 104, which is attached to a slide lever 106, which in turn is arranged on a shaft 108 which in the hollow shaft 102 lies and for the reciprocating Movement of the slide 104 provides. The hollow shaft 102 of the The hook 96 and the shaft 108 of the slide 104 are thus over a common axis 110 arranged coaxially. Figure 8 also shows the assignment of the slide needle 18a to the shed 8, which is formed by the warp threads 6, and to the weft insertion needle 12 and the reed 2. In FIG. 9 the Needle head 94 in the open, for receiving a weft loop 4 suitable position shown. The is to forfeit Needle 18a closed, as shown in Figure 10.

The hook 96 is advantageously the slide needle 18a on the weft insertion needle or the web 16 facing away Side at an angle of 0 ° to 180 ° to the plane of movement 112 of the slide needle 18a inclined.

REFERENCE SIGN LIST

2nd

Reed

4th

Weft loop

6

Warp thread

8th

Shed

10th

Goods edge

12th

Weft insertion needle

14

axis

16

Goods web

18th

Knitting needle

18a

Slide needle

20th

Weft

22

Feeding device

24th

Weft source

26

Weft brake

28

Conveyor

30th

Weft guard

32

Compensating device

32a

Compensating device

34

Guide eye

36

Blowing device

38

Suction device

40

Blow nozzle

42

management

44

Blower device

45

Compressed air

46

Suction nozzle

48

management

49

Suction air

50

Blower device

51

Ambient air

52

Goods edge

54

Retraction loop

56

Knitting loop

58

Weft course

60

Weft supply

62

leg

64

leg

66

guide

68

guide

70

Canal section

72

Blow nozzle

74

Blow air flow

76

Running direction

78

Weft supply

80

guide

82

chamber

84

Narrow side

86

Weft feed

88

Weft thread removal

90

Weft guard

91

Surveillance beam

92

Flow direction / suction air

94

Needle head

96

hook

98

Needle shaft

100

Hook lever

102

Hollow shaft

104

Slider

106

Slide lever

108

wave

110

axis

112

Plane of movement

Claims (15)

1. Ribbon loom having a weft insertion needle (12) with which there is associated a weft thread feed device (22) having a weft thread compensator (32, 32a) tensioning the weft thread, and having a knitting needle (18, 18a) to tie off a weft thread loop (4) inserted into the shed (8), characterized in that the compensator (32, 32a) operates pneumatically and is in the form of a blower (36) and/or a suction device (38), and in that - seen in the direction in which the thread runs - a separate weft thread guide eye (34) is arranged downstream of the compensator (32, 32a) and upstream of the weft insertion needle (12).
2. Ribbon loom according to Claim 1, characterized in that the separate guide eye (34) is arranged to be adjustable in position.
3. Ribbon loom according to Claim 1 or 2, characterized in that the blower (36) and/or suction device (38) has a flat rectangular chamber (82), which at one narrow side (84) has a weft thread inlet (68, 86) and at the other narrow side has a weft thread outlet (66, 88).
4. Ribbon loom according to Claim 3, characterized in that the width (B) of the chamber (82) is equal to or less than 50 times the thickness (D) of the weft thread (20), and in that the length (C) is greater than the width (B).
5. Ribbon loom according to Claim 3 or 4, characterized in that the weft thread in the chamber (82), preferably in the direction of flow (92) of the current of air, is arranged to be monitored, for breakage or running out, by means of a weft thread monitoring device (90).
6. Ribbon loom according to Claim 1 or 2, characterized in that the compensator (32a) has a channel section (70) for the weft thread (20) into which a blower nozzle (72) opens at an acute angle such that the blower air flow (74) acts counter to the running direction (76) of the weft thread (20).
7. Ribbon loom according to one of Claims 1 to 6, characterized in that a thread tension device (26) is arranged upstream of the compensator (32, 32a).
8. Ribbon loom according to one of Claims 1 to 4 and 6 to 7, characterized in that a preferably optical weft thread monitoring device (30) is arranged upstream or downstream of the compensator (32, 32a).
9. Ribbon loom according to one of Claims 1 to 8, characterized in that the feed device (22) has a weft thread source (24) and a weft thread conveying means (28) which are arranged upstream of the compensator (32, 32a).
10. Ribbon loom according to one of Claims 1 to 9, characterized in that the feed device (22) is adjustable in such a manner that the weft thread (20) is tensioned both with the weft insertion needle (12) in the out position and in the in position.
11. Ribbon loom according to Claim 10, characterized in that the tensioning of the weft thread (20) is adjustable, by means of a weft thread conveying means (28), with the weft insertion needle (12) in the in position and in the out position.
12. Ribbon loom according to Claims 2 and/or 10, characterized in that the tensioning of the weft thread (20) is adjustable, with the weft insertion needle (12) in the out position and in the in position, by means of the guide eye (34).
13. Ribbon loom according to one of Claims 1 to 12, characterized in that the knitting needle is in the form of a slide needle (18a).
14. Ribbon loom according to Claim 13, characterized in that its hook part (96, 98, 100) and slide part (104, 106, 108) are pivotable about the same axis (110).
15. Ribbon loom according to Claim 13 or 14, characterized in that the hook (96) of the hook part of the slide needle (18a), on the side of the web (16) remote from the weft insertion needle (12), forms an angle of 0° to 180° with the plane of movement (112) of the slide needle.

Images