EP2123813A1 - Heald shaft drive, switching lever assembly and switching lever for such - Google Patents

Abstract

The arrangement has a rod for connecting heald shafts with a drive machine that has a shaft lever (10a-10c) for each heald frame. The rod has switching levers (18a-18c) with arms (25a-25c), which together define angles (alpha, beta). Angle sums of the levers of the different heald shafts differ from each other. An angle of the lever (18a) of one heald shaft lying adjacent to a web bonding point is smaller than an angle of the levers (18b, 18c) of the other heald shafts that are arranged at a distance from the point.

Description

The invention relates to a heald shaft drive arrangement for a plurality of heald frames, a reversing lever set for such heald shaft drive arrangement and a reversing lever suitable for said heald shaft drive arrangement.

Weaving machines have several respect to the Kettfadenlaufrichtung successively arranged heddle shafts, which are alternately moved upwards and / or down to form a shed with the warp threads, in which the weft thread is entered. The stroke of a shaft may be directed upwards (upper compartment) or downwards (lower compartment). Ideally, the stroke up and the stroke down from a zero position are equal. The zero position corresponds to the shaft position at which the warp threads guided by the respective shaft lie in the warp thread plane. This shaft position is also called shed position.

To drive the heald frames are linkage, the lever contain. Usually used for driving the individual shafts linkage are uniform.

To be able to register the weft thread in the shed, the shed must be sufficiently wide open and be left open for a sufficient time. To meet this condition, the shafts remote from the tissue attachment point are often given larger strokes than the shafts proximal to the tissue attachment point. As the strokes increase with increasing removal of the heald from the fabric bond point, such that all warp yarns are fed up or down at nearly uniform angles, a "clean shed" is used. However, the warp threads are stretched and stressed differently. If, on the other hand, the yarn stresses are made uniform, i. If the individual weaving strokes are approximately the same size, the specialist setting is referred to as "scattering broach". This is not optimal with regard to the weft insertion. Therefore, in practice usually a combination of "pure subject" and "scattering" is used. This setting is called a "mix tray".

It can be seen that in practice both the stray and the mixing compartment with different shank strokes on the individual healds is worked. While some of the heald frames realize the above-mentioned ideal whereby the upper shed lift and the lower shifter stroke are equal, the lever deflections of the linkage in some other heald frames result in a significant difference between upper shed and lower shifts. These differences are also referred to as "distortion". This distortion leads to a decrease in the size of the sub-compartment or the upper compartment. In order to ensure sufficient space for the weft insertion, the stroke must be increased overall. This represents an unnecessary burden on the warp threads, the heald frames and the shedding machine as well as a load on the bearings and deflection points.

On this basis, it is an object of the invention to provide a correspondingly improved heald shaft drive arrangement.

This object is achieved with the heald shaft drive arrangement according to claim 1, e.g. by using a Umlenkhebelsatzes according to claim 8, and / or by using Umlenkhebeln according to claim 12:

The invention solves the above object by a heald shaft drive assembly with differently designed linkage for individual heddle shafts. The linkage of the individual heald frames differ, for example, and preferably by differently configured, differently connected or differently adjusted deflection levers. The reversing levers are characterized in particular by different angles, which enclose their two lever arms in each case. By using different reversing lever can be achieved that for a given shed angle on all involved Webschäften, despite stray adjustment or Mischfacheinstellung, the existing distortions are reduced and in particular unified. Thus, the loads on the reversing levers, bearings, heddles and warp threads are standardized.

The use of differently shaped linkage in particular of the reversing lever per weaving shank allows a uniform distribution of the total stroke in a Oberfachhub and a Unterfachhub so a so-called distortion-free hub and this regardless of the size of the total stroke. Distortion-free strokes of heddles which perform different strokes have according to the invention different linkage in particular bellcrank.

The different design lever can be combined with different lengths connecting rods that connect the lever with shaft levers of the drive machine. In addition to connecting rods with a fixed length and length-adjustable connecting rods can be used.

The lever can each have a fixed angle between their lever arms. The reversing levers together form a Umlenkhebelsatz comprising at least two lever with different angles. Preferably, lever arms are used for the connection point remote heddle shafts, which have a greater angle than the lever of the weaving shafts near the binding point.

It can also be used as an alternative uniform lever, which have a Winkeleinstellmöglichkeit. The Winkeleinstellmöglichkeit can be given by a stepless adjustment or an adjustment that allows only a graded adjustment of the various angles. Preferably, the gradations are made such that they coincide with the angles required at the different weave shaft positions. The adjustment of the angle can be done for example by correspondingly positive or frictional clutches, adjusting means, for example in the form of screws or the like, which has a lever arm of the Angle lever or a part of the same adjust. Just as well, it is possible to provide on one of the lever arms different articulation points for a wegführender connecting rod, a Unterzugsstange or a wegführende lifting rod, these connection points are alternatively usable.

• Fig. 1 Eine Fachbildemaschine, einschließlich einer Webschaft-Antriebsanordnung, in schematischer Frontalansicht.
• Fig. 2 Einen Ausschnitt aus einem Umlenkhebelsatz der Webschaft-Antriebsanordnung nach Figur 1.
• Fig. 3 Eine Kinematik mehrerer Umlenkhebel des Umlenkhebelsatzes der Webschaft-Antriebsanordnung nach Figur 1.
• Fig. 4 Die Fachbildemaschine nach Figur 1, in einer schematisierten Seitenansicht.
• Fig. 5 bis 11 verschiedene Varianten von Verstellbaren Umlenkhebeln in schematisierten Seitenansichten und
• Fig. 12 die Darstellung von Fachbildedifferenzen an verschiedenen Webschäften bei der erfindungsgemäßen Maschine im Vergleich zu konventionellen Maschinen.

Further details of advantageous embodiments of the invention are the subject of the drawing, the claims or the description. The description is limited to essential aspects of the invention and other circumstances. The drawing is to be used as a supplement. It reveals more details. Show it:

• Fig. 1 A shedding machine, including a heald shaft drive assembly, in a schematic frontal view.
• Fig. 2 A section of a Umlenkhebelsatz the heald shaft assembly after FIG. 1 ,
• Fig. 3 A kinematics of several reversing lever of Umlenkhebelsatzes Webschaft drive assembly according to FIG. 1 ,
• Fig. 4 The shedding machine after FIG. 1 , in a schematic side view.
• Fig. 5 to 11 different variants of adjustable levers in schematic side views and
• Fig. 12 the representation of differences in sheds on different heald frames in the machine according to the invention in comparison to conventional machines.

In the following description of the figures embodiments of the invention are described. A reference to elements of the description of the figures and the claims without a letter index and in the singular or plural is in each case regarded as a general reference for all elements with a corresponding reference symbol irrespective of whether they bear a letter index or not. Reference to individual elements using a letter index is specific to the element so designated.

In FIG. 1 a shedding machine 1 is illustrated, to which a group of healds 2 belong. Each weave 2 is formed by a frame with upper and lower shaft rods and side supports. On the shaft rods in each case a plurality of healds 3 is mounted. These serve to guide warp threads 4, as they are made FIG. 4 emerge. The individual warp threads 4 are each provided with the same letter index as the weave shaft 2a to 2f to which they belong. As can be seen, to clarify a shedding process, the warp threads 4a, 4b, 4c, 4d and 4f are displaced upwardly out of the warp thread plane by a corresponding stroke of the heald frames 2a, 2b, 2c, 2d and 2f. They are in the upper part. The weave 2e is shifted downwards. Accordingly, the warp thread 4e is in the lower compartment. The warp threads 4 run starting from a warp beam (not shown), from a rear compartment, through a thread eye of the heddles 3 of a heald 2 radiate to a fabric tying point 5 in the front compartment. From this fabric binding point 5, at which the weft stop takes place, the fabric 6 extends away in the direction of the fabric tree (not shown). The warp threads close with the warp thread plane a box angle of eg 32 °. Between the warp thread 4e and the other warp threads 4a to d and 4f a shed 7 is clamped for the weft insertion. The in FIG. 4 The area denoted by the reference numeral 7 represents the section of a complete shed which is obvious to the goods tree. The number of sheds 2 can be smaller or larger than shown. The shedding can be done in any combination of heald 2.

The individual heald 2 are how out FIG. 1 can be seen, moved by means of a heald shaft drive assembly 8. To this belongs a drive machine 9, from whose housing a group of rockers or shaft levers 10 protrudes, one for each weaving shed 2 (2a to 2f). Each of these shaft levers 10 is connected via a linkage 11 individually with its respective associated weaving shank 2 (2a to 2f). About the linkage 11, the heald frames 2 are driven via corresponding provided on the lower shaft rod terminals 12, 13, 14. Of these extend lifting rods 15, 16, 17 down to reversing levers 18, 19, 20. The lifting rods 15, 16, 17 comprise means (not shown) with which the lengths of the lifting rods 15, 16, 17 can be changed. The height positioning of a heald 2 can be done by means of the lifting rods 15, 16, and 17. The lever 18, 19, 20 are formed as an angle lever. They are pivotally mounted about horizontal parallel axes of rotation. The pivoting movement is in FIG. 1 indicated by curved arrows and leads to a likewise indicated by an arrow right next to the heald 2 vertical up and down movement of the same. To cause this, the lower ends of the angle levers 18, 19, 20 are articulated by substantially horizontally arranged Unterzugstangen 21, 22 connected with each other. To drive this arrangement, the lever 18 is pivotally connected via a connecting rod 23 with the shaft lever 10. The connecting rod 23 may be rigid and of fixed length. The individual connecting rods 23, which are assigned to the individual heald frames 2, can have individual lengths, as a result of which the individual linkages leading from the shaft levers 10 to the heald frames 2 are designed differently with one another. The linkage 11 in the embodiment according to FIG. 1 includes the terminals 12, 13, 14, the lifting rods 15, 16, 17, the lever 18, 19, 20, the Unterzugstangen 21, 22 and the connecting rod 23. Alternatively formed linkage 11 may have other means to pivot lever 10 and Webschaft second to connect with each other.

The lever 19, 20 of all lever mechanism of the shed drive assembly 8 may have a uniform angle between their lever arms. However, the angle levers 18 (18a, 18b, 18c, 18d) which make the connection between the connecting rods 23 and the lower tie rods 21 are preferably not formed uniformly. This is off FIG. 2 seen.

The reversing levers 18 form a Umlenkhebelsatz 24, in which the lever arms 25, 26 of each reversing lever 18 with each other different angles α, β, γ, etc. include. The lever arms 25 of all the lever 18 may have a uniform length. The lever arms 26 of all the lever 18 may also have a uniform length. The lengths of the lever arms 25, 26 may be chosen differently.

At least one of the deflection lever 18 has an angle α which differs from the angle β of at least one other deflection lever 18. This is in FIG. 3 illustrated schematically. The connecting rods 23a, 23b, 23c have different lengths because of the different angular positions of the downward-pointing lever arms 25a, 25b, 25c. In addition, in order to realize different strokes of the connected heddle shafts 2, they are preferably fixed to the shaft levers 10a, b, c at different height positions.

Each lever 18 has at the ends of its lever arms 25, 26 joints or connection points for the connecting rod 23 and the lifting rod 15. The angle which the lever arms 25, 26 enclose with each other, are formed by the connecting lines of the centers of these connection points with the axis of rotation 27 about which the lever 18 are pivotally mounted. Preferably, all the lever 18 are pivotable about a common axis of rotation or pivot axis 27. In addition to the connection point for a connecting rod 23, the lever arm 25 has a bearing point for the lower tie rod 21.

The shed forming machine 1 described so far operates as follows:

The movement of the heald frames 2a to 2f is predetermined by the heald shaft drive arrangement 8. The prime mover 9 moves the individual shaft levers 10 accordingly. About the linkage 11, this movement is transmitted to the heald frames 2a to 12f. In motion transmission, the movement is slightly changed. In other words, the lifting or lowering movement each weave 2a to 2f is not proportional to the movement of the individual shaft levers 10 due to a non-linear motion transmission law.

In FIG. 4 is a snapshot of the work of the shedding machine 1 illustrated, with only the warp threads 4 of the front compartment are shown on their way from the respective weaving shank 2 to the fabric weave point 5 in the direction of the fabric tree. The rear compartment and the course of the warp threads 4 in this is not shown for the sake of simplicity. The heddle shafts 2a, 2b, 2c, 2d and f are in the upper compartment. The weave 2e is in the lower part. The healds 2a, 2b, 2c, 2d have an equal lifting height. They form a "stray brook". The healds 2e and 2f are set to different heights. They form a pure subject. Overall, a mixing compartment is thus formed. This is for illustrative purposes only. The subject setting can basically be chosen differently.

In FIG. 3 is the kinematics of the shed-drive assembly 8 based on the first three lever 18a, 18b, 18c shown, whose angles α, β, γ are coordinated so that at a given shed angle of, for example, 32 ° at any of the healds a significant difference between the size of the stroke up (top compartment) and the down stroke (bottom compartment). This corresponds to the curve V in FIG. 12 , For slightly larger or smaller shed angles (these are the angles that the respective warp thread includes with the warp thread plane), there are only minor, completely negligible deviations between the shed height of the shed and the shed of about + 0.5 mm or - 0.5 mm , This is shown by the curves IV and VI of FIG. 12 , It is particularly significant that this small difference does not increase significantly with increasing distance of a weave 2 of the tissue binding point 5.

In contrast, the differences between the upper shed and lower shed at corresponding shed angles between 30 ° and 34 ° in conventional shed drive assemblies with increasing distance from the fabric weave point 5, as the curves show I to III, almost extreme proportions. In FIG. 12 The shafts close to the binding point are on the left and the weaving shafts distant from the tie point are on the right. The diagram in FIG. 12 illustrates the situation for ten healds.

With the invention, the excessive loads of warp threads, strands and other parts of the shedding machine 1, which can cause differences of more than 9 mm, basically avoided.

The invention can, as FIG. 2 indicates, be realized by a Umlenkhebelsatz 24, which consists of differently designed reversing levers 18a, 18b, 18c, etc. However, it is also possible to provide adjustable lever 18 of various types. FIGS. 5 and 6 shows an adjustable lever 18, the lever arms 25, 26 are adjustable against each other. For this purpose, a toothed coupling 28 is provided between the two. This allows a stepwise adjustment of the lever arms 25, 26 to change the angle between the two.

It is also possible to provide such or other coupling 29 on only one of the two lever arms 25, 26, as it FIG. 7 shows. The adjustment can be stepless or specify setting levels.

A stepwise adjustment is also according to a basically rigid lever 18 FIG. 8 possible. This allows an adjustment of the angle between the two lever arms 25, 26 by 26 different articulation points 39a, 39b, 39c for the connecting rod 23a, 23b, 23c, are available on one of the lever arms 25, available.

Such alternative pivot points may also be provided on the lever arm 26, which is in FIG. 8 not shown. The articulation points 39a, 39b, 39c, etc. are preferably arranged so that the desired angles α, β, γ are predetermined.

Another alternative illustrates FIG. 9 , The two lever arms 25, 26 are here provided with adjusting means, for example an angle adjusting device in the form of an adjusting screw 30, which adjusts the angle set between the lever arms 25, 26 by rotation.

While according to FIG. 9 a pivoting or rotation of the lever arms 25, 26 takes place against each other, it is also possible to divide one of the lever arms 25, 26 and provided with a displacement device 31. This linear displacement of a part of the lever arm 25, which carries the articulation point 39, causes an angular adjustment. According to FIG. 11 can also only a portion of the lever arm 25 which carries the pivot point 39, be pivotally mounted, while another portion 25 ', which serves for example for connecting the Unterzugstange 21, may be rigid.

Further modifications are possible, as far as they serve to adjust the effective angle α, β or γ and lock in the set size.

A shedding machine 1 according to the invention utilizes in its shed-drive arrangement 8 deflecting levers 18a, 18b, 18c, which convert the reciprocating drive movement of connecting rods 23a, 23b, 23c into up and down movements of lifting rods 15 on the one hand, and on the other hand via lower tie rods 21 Drive the lever 19, 20. The deflection levers 18a, 18b, 18c have different angles α, β, γ between their lever arms 25a, 25b, 25c and 26a, 26b, 26c. Preferably, the connecting rods 23a, 23b, 23c have correspondingly different lengths. These are dimensioned so that all heald frames 2a, 2b, 2c are in shed-closure position when the shank levers 10a, b, c are in the neutral position.

Due to the different angles α, β, γ on the reversing levers 18a, 18b, 18c, it is achieved that the compartment differences between the upper compartment and the lower compartment are small and independent of the distance of the tissue binding point 5.

Reference numerals:

1

Shedding machine

2, 2a-2f

heald

3

healds

4, 4a-4f

warp

5

Fabric binding point

6

tissue

7

shed

8th

Shed drive assembly

9

prime mover

10

shaft lever

11

linkage

12, 13, 14

connections

15, 16, 17

lifting rods

18, 19, 20

Umlenkhebel

21, 22

Unterzugstangen

23

connecting rod

24

Umlenkhebelsatz

25

lever arm

26

lever arm

α, β, γ

Angle between 25a, 26a, 25b, 26b, 25c, 26c

27

swivel axis

28

gear coupling

29

clutch

30

adjustment

31

shifter

39

articulation

Claims (15)

Web shaft drive arrangement (8) for a plurality of heald frames (2), with a linkage (11) for connecting the heald frames (2) to a drive machine (9) which has a shaft lever (10) for each heald shaft (2), wherein the linkage (11) at least one reversing lever (18) having two arms (25, 26) which define an angle (α, β) with each other, and wherein the angular amounts (α, β) of the deflection lever (18) of two different heald frames (2) differ from each other. A heald shaft drive arrangement according to claim 1, characterized in that the angle (α) of the deflection lever (18a) of a weaving sheave (5) is smaller than the angle (β) of a deflection lever (18b, 18c) of a heald (2b, 2c), which is located away from the tissue binding point (5). Web shaft drive arrangement according to claim 1, characterized in that the deflection lever (18) via a connecting rod (23) with the shaft lever (10) is connected. Web shaft drive arrangement according to claim 1, characterized in that each deflection lever (18) via a connecting rod (23) with the shaft lever (10) is connected, wherein the individual connecting rods (23) have different lengths. Web shaft drive arrangement according to claim 1, characterized in that the deflection lever (18) via a length-adjustable connecting rod (23) with the shaft lever (10) is connected. Heald shaft drive arrangement according to claim 1, characterized in that the deflection lever (18) via a lifting rod (15) with the weaving shank (2) is connected. Web shaft drive arrangement according to claim 1, characterized in that the deflection lever (18) via a length-adjustable lifting rod (15) with the weaving shank (2) is connected. Deflection lever set for a heald shaft drive arrangement according to claim 1, characterized in that it comprises at least two deflection levers (18a, 18b) whose arms (25a, 26a, 25b, 26b) each enclose an angle (α, β), the amounts the two angles (α, β) differ from each other. Reversing lever set according to claim 8, characterized in that the arms (25a, 26a) of the one reversing lever (18a) are as long as the arms (25b, 26b) of the other reversing lever (18b). Reversing lever set according to claim 8, characterized in that the lever arms (25, 26) of at least one of the reversing levers (18) are rigidly and non-detachably connected to each other. Reversing lever set according to claim 8, characterized in that the lever arms (25, 26) of a plurality of deflection levers (18) are each rigidly and permanently connected to each other. Deflection lever for a heald shaft drive arrangement according to one of claims 1 to 7 or for a reversing lever set (24) according to one of claims 8 to 11, characterized in that the lever arms (25, 26) of the reversing lever (18) are adjustable with respect to each other. Deflection lever according to claim 12, characterized in that the deflection lever (18) has an angle adjustment device (29, 30) for adjusting the angle (α, β). Reversing lever according to claim 13, characterized in that the angle adjustment device has a positive locking device (29, 30). Reversing lever according to claim 12, characterized in that the angle adjustment determines predetermined stages.

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