EP2063007B1 - Device for making leno fabrics - Google Patents

Abstract

The device (1) has two lifting shafts (2, 3), which supports traction or lifting healds (12, 13). A semi-shaft (28) supports a semi-heald. The semi-shaft is connected with one of the lifting shafts via a drive (30) i.e. lever drive (31). A connection lever is designed as guiders (33, 34), which are connected with an end of a connecting rod (10) in a hinged manner, where the end is distant from the semi shaft. One of the guiders is connected with one of the lifting- shafts at a joint (36), and the other guider is connected with the other lifting-shaft at another joint (37).

Description

The invention relates to a rotary device.

Rotators are used to make leno fabrics. A leno fabric is a fabric in which at least two warp threads do not run parallel to each other but wrap around each other. For example, a warp thread runs as a ground thread straight through the fabric, while another warp thread is guided as a looping yarn in zigzag over or under the ground thread back and forth and alternately formed on one side or the other a downward or upward loop for receiving the weft. For clarification is in FIG. 8 illustrated a schematic section of a leno fabric, with ground threads S1, S2, S3, S4, with loop threads S5, S6, S7, S8 and with warp threads K1, K2, K3. Shown is a simple binding that can be made arbitrarily complicated.

To produce such tissue, the aforementioned rotary devices in use as they are, for example, from the CH 391595 can be seen. The rotary device is also referred to as a "rotary shaft" and is divided into two Hebeschäfte and a half-shaft. While the lifting shafts are driven vertically up and down by a dobby, for example via a linkage, the half-shank is moved by a spring-loaded yoke, which is taken alternately by one or the other pull shaft with (down). Such a system works well, but the speed of work has to be limited. Indeed Weaving machines are operated with such rotators in the range of 150 to a maximum of 250 rounds per minute. Due to the low productivity achieved in this way, the fabric produced becomes extremely expensive and, as a result, its application remains severely limited.

From the US-A-2,043,165 is a rotary device with two lifting operations known to carry lifting healds. In addition, the rotary device has a half-shaft with half-strands. To drive the lifting shanks and the half-shank a gear is provided that has sitting on a common shaft different cams that operate via a linkage, the lifting shanks and the half-shaft. The gearbox must have specific curves for the half-shaft.

It is an object of the present invention to provide a device for driving the half-shaft, which makes it possible to produce leno fabrics by means of lifting and half-strikes with a significantly higher number of shots. In particular, the device should be simple and robust.

This object is achieved with the rotary device according to claim 1:

The rotary device comprises two lifting shanks and a half-shank and is also referred to as a turning shaft as a whole. A gear connects the half-shaft with the lifting shafts to divert the movement of the half-shaft from the movement of the lifting shafts. This happens as a result of the proposed forced coupling the movement of the half-shaft with the movement of the lifting shafts bum-free and thus allows high speeds. To achieve the same, no additional device is required on the shaft or eccentric machine used to drive the lifting shafts. Nevertheless, a positive and thus forcibly performed or inevitable drive of the half-shaft. The Halbschaft performs a smooth movement. The movement is represented by a limited number of harmonic functions. The gearbox determines for the half-shaft a continuously differentiable path-time curve, as long as the lifting shafts move according to a continuously differentiable path-time-law.

The transmission is preferably a lever mechanism, which derives the movement of the half-shaft, at least from the movement of one of the lifting shafts, but preferably also from the movement of both lifting shafts. To the transmission preferably belongs at least one connecting rod, which is pivotally connected at one end to the half-shaft. The other end of the connecting rod is preferably connected via two equal length connecting lever, which are designed as links, articulated with the two lifting shafts. Preferably, the two arms are the same length. The connecting rod is preferably considerably longer than the handlebars. Preferably, it is at least twice as long as the same. In addition, the connecting rod is preferably located centrally between the two joints, via which the links are connected to the lifting operations.

The lifting shaft is preferably driven by at least two lever mechanism of the same type by the lifting operations. The lever mechanism are arranged at a certain distance from each other. They can be the same or mirror-symmetrical to each other.

Further preferably, the length of the connecting rod is adjustable. A corresponding adjusting device may be provided on the connecting rod, the connecting rod joint or on the joint which connects the connecting rod with the handlebars.

The rotary device can be formed by at least two heddles as needed above the center of the trade or be arranged below the middle of the trade.

• Fig. 1 eine Drehereinrichtung mit Antrieb, in schematisierter Frontalansicht;
• Fig. 2 die Drehereinrichtung nach Figur 1, in geschnittener perspektivischer Teilansicht;
• Fig. 3 und 4 die Litzen der Drehereinrichtung in verschiedenen Arbeitsphasen, in gesonderter ausschnittsweiser Darstellung;
• Fig. 5 die Drehereinrichtung in ausschnittsweiser Darstellung zur Veranschaulichung seines Hebelgetriebes;
• Fig. 6 die Kinematik des Hebelgetriebes;
• Fig. 7 Bewegungskurven der Hebeschäfte und des Halbschafts als Diagramm und
• Fig. 8 ein Drehergewebe in schematischer Darstellung.

Further details of advantageous embodiments of the invention are the subject of the description, the drawings or claims. The description is limited to essential aspects of the invention and other circumstances. The drawing discloses further details and is additionally to be used. Show it:

• Fig. 1 a rotary device with drive, in a schematic frontal view;
• Fig. 2 the rotary device after FIG. 1 in cut partial perspective view;
• Fig. 3 and 4 the strands of the rotary device in different phases of work, in a separate fragmentary representation;
• Fig. 5 the rotary device in a sectional view for illustrating its lever mechanism;
• Fig. 6 the kinematics of the lever mechanism;
• Fig. 7 Movement curves of the lifting shops and the half-shaft as a graph and
• Fig. 8 a leno fabric in a schematic representation.

In FIG. 1 a leno device 1 is shown, which is also referred to as a turning shaft. This turning device 1 is arranged above the middle of the compartment, which is formed by at least two heddle shafts. If necessary, it can also be arranged below the middle of the compartment and is then connected to the in FIG. 1 shown turning device mirror image executed. To the rotary device 1 includes two Hebeschäfte 2, 3, each having an upper shaft rod 4, 5 and a lower shaft rod 6, 7 have. The shaft rods 4 and 6 are interconnected by side supports 8, 9 to form a rectangular, substantially rigid frame. The shaft rods 5, 7 are also connected to each other by side supports 10, 11, which in turn is a rigid frame is formed. The shaft rods 4, 5, 6, 7 are each provided with Litzentragschienen, which, like FIG. 2 shows hawkers 12, 13 wear. These are sometimes referred to as Zuglitzen. This is especially true if a half-heald 14 arranged between them is arranged in a hanging manner, like the half-heald Figures 3 and 4 demonstrate.

The pull or lifting healds 12, 13 have end loops, with which they sit on heddle support rails 15, 16, 17, 18 ( FIG. 2 ), which are fixed to the shaft rods 4, 5, 6, 7. The lifting healds 12, 13 can, as FIG. 3 and 4 each consist of steel strips 12a, 12b, 13a, 13b, which define between each other a gap through which legs of the half heald 14 extend. At a connection point 19, 20, the steel strips 12a, 12b, 13a, 13b may be interconnected. The half heald 14 has at its in FIG. 3 and 4 lower end of a web 21 limited eye through which the leno thread 22 runs. By contrast, the ground thread 23 strips past the half-strand 14, before it extends between the two tension strands 12, 13.

The half heald 14 is generally U-shaped Bracket formed of flat material, with its two leg ends are provided with end eyelets 24, 25. These sit on heddle rails 26, 27, which together form a so-called half-shaft 28 ( FIG. 2 ). They can be connected to one another by means of corresponding spacing bolts 29, which at the same time form a connection point for a transmission 30, which moves the half-shaft 28 vertically. This gear 30 is preferably formed as a lever mechanism 31, which connects the upper shaft rods 4, 5 of the pulling or lifting shafts with the half shaft 28.

The lever mechanism 31 goes out FIG. 2 and especially from FIG. 5 out. To the lever mechanism 31 includes a connecting rod 32 which is connected via a connecting rod to the half-shaft 28. The connecting rod joint is formed, for example, by the spacer bolt 29 or a seated on this, not shown, bearing. The connecting rod 32 extends from the half-shank 28 away upwards between the upper shaft rods 4, 5 of the lifting shafts 2, 3. At its upper end it is articulated with two connecting levers in the form of the links 33, 34 connected. The purpose of a bolt 35, which forms a connecting joint and can be provided with separate storage means.

The handlebar 33 is connected via a hinge 36 with the upper shaft rod 4. The handlebar 34 is pivotally connected via a hinge 37 with the shaft rod 5. The joints 36, 37, 35, 29 have pivot axes, which are oriented parallel to each other and are preferably aligned transversely to the shaft rods 4, 5, the links 33, 34 form connecting levers between the upper shaft rods 4, 5 and the connecting rod 10th are effective. They are how FIG. 6 shows, preferably the same length. More preferably, they are at most half as long as the connecting rod 10. Measured in the longitudinal direction of the half-shaft 28 distances A (between the joint 36 and 29) and B (between the hinge 29 and 37) are preferably the same size. Further preferably, the length of the connecting rod 10 is adjustable. In addition, it can be provided that at least one of the joints 36, 37 or both are adjustably mounted in the longitudinal direction of the shaft rod 4 and 5 respectively.

As FIG. 1 shows, the half-shaft 28 is preferably moved via two lever mechanism 31, 31 ', which are constructed mirror-symmetrically to each other. The relative to the plane before the connecting rod 10 lying arm 34 is connected to a right against the joint 29 offset joint 37. The joint 37 'of the front of the connecting rod 10' lying arm 34 'is offset against the hinge 29' to the left. The reverse applies to the trailing arms 33, 33 'and their joints 36, 36' with respect to the drawing plane behind the connecting rods 10, 10 '.

The mirror-symmetrical configuration has the advantage that mass moment of inertia and inertia forces, which emanate from the lever gears 31, 31 'in operation, are largely compensated. With appropriate guidance of the half-shaft 28, the lever mechanism 31, 31 ', however, also be formed with each other the same. Furthermore, a plurality of such lever mechanism can be provided. The lever mechanism 31, 31 'form a parallel guide for the half-shaft 28.

• Zur Herstellung des Gewebes nach Figur 8 wird der Dreherfaden 22 (beispielsweise S5, S6, S7, S8 aus Figur 8) abwechselnd rechts und links an den Steherfaden 23 (S1, S2, S3, S4) vorbeigeführt. Dies geschieht durch abwechselnde Auf- und Abwärtsbewegung der Hebeschäfte 2, 3. Figur 7 veranschaulicht mit Kurve I die Bewegung des Hebeschafts 2 von seiner oberen Position nach Figur 1 in eine untere Position. Die Kurve II veranschaulicht die Bewegung des Hebeschafts 3 aus seiner in Figur 1 dargestellten unteren Position in eine obere Position. Die Kurve III veranschaulicht die sich daraus ergebende Bewegung des Halbschafts 28. Mit dieser Bewegung wird der Dreherfaden 22 an dem Steherfaden 23 vorbeigeführt. Je nach dem, welcher der beiden Hebeschäfte 2 oder 3 nach unten und welcher der beiden Hebeschäfte 2 oder 3 nach oben geführt wird, ergeben sich die Verhältnisse nach Figur 3 oder nach Figur 4, d.h. der Dreherfaden 22 wird bezüglich der Zeichenebene vor (Figur 3)oder hinter (Figur 4) demselben nach unten geführt. Jeweils nach dem Schusseintrag fährt einer der Hebeschäfte 2, 3 nach oben während der jeweils andere dann nach unten fährt. Diese Bewegung wird mittels des in Figur 1 schematisch angedeuteten Antriebsgestänges 38 erhalten, das die beiden Hebeschäfte 2, 3 mit unterschiedlichen Schwingen 39, 40 einer Schaftmaschine 41 verbindet.

The rotary device 1 described so far operates as follows:

• To fabricate the fabric FIG. 8 the leno thread 22 (for example, S5, S6, S7, S8 off FIG. 8 ) alternately passed right and left to the ground thread 23 (S1, S2, S3, S4). This is done by alternating upward and downward movement of the lifting shafts 2, 3. FIG. 7 illustrates with curve I the movement of the lifting shaft 2 from its upper Position after FIG. 1 in a lower position. The curve II illustrates the movement of the lifting shaft 3 from its in FIG. 1 shown lower position in an upper position. The curve III illustrates the resulting movement of the half-shaft 28. With this movement, the leno thread 22 is guided past the ground thread 23. Depending on which of the two lifting shafts 2 or 3 down and which of the two lifting shafts 2 or 3 is guided upward, the conditions arise FIG. 3 or after FIG. 4 , ie the leno thread 22 is in front of the plane ( FIG. 3 ) or behind ( FIG. 4 ) led to the same down. In each case after the weft insertion one of the lifting shafts 2, 3 moves upwards while the other one then moves downwards. This movement is done by means of the in FIG. 1 schematically indicated drive linkage 38, which connects the two lifting shafts 2, 3 with different wings 39, 40 of a dobby 41.

As can be seen, all curves I, II and III are kink-free and smooth. In particular, it is advantageous that the half-shaft 28 is moved without jerky acceleration.

A rotary device uses lever mechanism 31, 31 'to derive the movement of their half-shaft 28 from the movement of their lifting or lifting shafts 2, 3. The lever mechanisms 31, 31 'connect shaft rods 4, 5 of the pulling or lifting shafts 2, 3 with the half-shank 28, wherein a connecting rod 10, 10' extends from top to bottom between the two pulling or lifting shafts 2, 3. The upper end of the connecting rod 10, 10 'is on both sides of the connecting rod 10, 10' via connecting levers 33, 34, 33 ', 34' with joints 36, 37, 36 ', 37' connected to the upper shaft rods 4, 5 of the pulling or lifting shafts 2, 3 are connected.

LIST OF REFERENCE NUMBERS

1

Turning device / Dreherschaft

2, 3

lifting frames

4, 5

upper shaft rod

6, 7

lower shaft rod

8, 9, 10, 11

side supports

12, 13

lifting healds

12a, 12b, 13a, 13b

steel strips

14

half heald

15, 16, 17, 18

heald

19, 20

junction

21

web

22

leno thread

23

ground thread

24, 25

end loops

26, 27

Litzentragschienen '

28

half stock

29

Connecting rod joint, distance bolts

30

transmission

31

lever mechanism

32

pleuel

33, 34

handlebars

35

bolt

36, 37

joints

A, B

distances

I, II, III

curves

38

drive linkage

39, 40

Swing

41

dobby

Claims (8)

1. Apparatus for making leno fabric,
   with two lifting shafts (2, 3) supporting lifting healds (12, 13), and
   with a half shaft (28) supporting the half heald (14), and
   with a transmission (30), by means of which the half shaft (28) is connected to at least one of the lifting shafts (2, 3) by forced coupling,
   wherein the transmission (30) is a lever gear (31), to which

   • at least one connecting rod (10) belongs that is connected at one end to the half shaft (28) to be able to pivot at a connecting rod joint (29),

   characterised by

   • connection levers, which are configured as guide rods (33, 34), which are respectively articulated to the end of the connecting rod (10) remote from the half shaft (28), wherein

   • one of the guide rods (33, 34) is connected to one of the lifting shafts (2, 3) at a first joint (36) and the other guide rod (33, 34) is connected to the other lifting shaft (2, 3) at a second joint (37).
2. Apparatus for making leno fabric according to claim 1, characterised in that the lifting shafts (2, 3) respectively have two heald bars (15, 17; 16, 18), and that the lifting healds (12, 13) have end eyelets, which sit on the heald bars (15, 17; 16, 18).
3. Apparatus for making leno fabric according to claim 1, characterised in that the half shaft (28) has at least one heald bar (26, 27), and that the half healds (14) have end eyelets (24, 25), which sit on the heald bar (26, 27).
4. Apparatus for making leno fabric according to claim 1, characterised in that the connecting bar joint (29) and the joints (36, 37) respectively define swivel axes, which are oriented parallel to one another.
5. Apparatus for making leno fabric according to claim 1, characterised in that the two guide rods (33, 34) are of equal length.
6. Apparatus for making leno fabric according to claim 1, characterised in that the two guide rods (33, 34) are shorter than the connecting rod (10).
7. Apparatus for making leno fabric according to claim 1, characterised in that the two joints (36, 37) are spaced from one another transversely to their swivel axes at a distance (A and B).
8. Apparatus for making leno fabric according to claim 1, characterised in that the transmission (30) has two lever gears (31) spaced from one another.

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