EP1639165B1 - Heald frame rod comprising a displaceable heald damping element - Google Patents

Description

The invention relates to a shaft rod, in particular for a loom of a loom, with the features of the preamble of claim 1. Furthermore, the invention relates to a built-up with at least one such shaft rod heald.

Web shafts of weaving machines are usually formed by a rectangular frame whose long sides are formed by so-called shaft rods. On each shaft rod a Litzentragschiene is held. Between each other parallel heddle rails, the healds are arranged, sitting with their end loops on the Litzentragschienen. Each heald has at least one thread eye through which a warp thread moves, which is moved by the movement of the heald for shedding. The healds are held with a certain longitudinal play on the heddle rails, so that they can align themselves in the lateral direction freely and are neither compressed nor stretched. This game causes when working the loom, a constant hitting or rattling of the strands on the Litzentragschienen, which is a source of noise. In addition, this creates a load on the healds, which can lead to strand breakage.

From the WO 01/48284 A1 is a weaving shank known for a weaving machine, the shaft rods are provided at the end loops of the strands facing sides each with a damping element. This is arranged within the play area of the end eyelet, so that it can abut against the damping element. When hitting the material with damping properties less noise and mechanical stress on the heald than in Providence of hard attacks.

This principle is also used by the U.S. Patent 3,895,655 and the CH-PS 588582 realized.

As the damping material is rubber or the like in question. When pulling in the strands stand with their end loops on the lower damping element and remain suspended frictionally. This complicates the Litzeneinziehvorgang. This is all the more so when working with relatively little clearance between the lower end eyelet and the damping element to the back and forth hitting the heddles bezügl. their longitudinal direction limit. If, however, worked with great game the damping effect remains limited.

On this basis, it is an object of the invention to provide a shaft rod, which allows a quiet operation. It is another object of the invention to provide a method for equipping a weaving shank, which has at least one such shaft rod, wherein the retraction process for the strands should proceed as possible without complications.

These objects are achieved with the shaft rod according to claim 1 and with the method according to method claim:

The shaft rod according to the invention has a damping element arranged in the vicinity of the shaft support rail, which is mounted so as to be movable transversely on the shaft rod. It is thus related. movably supported in the longitudinal direction of the strands. This results in a reduction of wear between the mounting rail and the strands. The strand movement is damped very effectively. The damping measure also leads to a prevention of strand breaks and noise reduction.

It is essential in a shaft rod according to the invention with a movable damping element, that the strands are taken from the support rails, ie pulled, wherein a damping element rests on the strands due to its gravity or inertia throughout the movement sequence. The strands are kept free to move and are damped only by the weight of the damping element. In the reversal points of the direction of movement of the heald shaft, the damping elements take over due to their elasticity possibly a short-term sliding function. At these reversal points The strands dive slightly into the damping elements, so that the strands are slowed down gently and not abruptly, and then continue their movement in the opposite direction.

The loose storage of the damping element on the shaft rod also opens a way to facilitate the placement of the heald with healds. The damping element is not firmly held on the heald and can thus be moved in the axial direction. This applies at least if, as is preferred, it has a constant cross-section along its longitudinal extent. The heald can thus be initially equipped with strands, the damping element is still missing in this operation. The warp threads can first be drawn into the healds by the drawing-in machine, after which the damping element is then inserted into the heald. The corresponding method steps are specified in the method claim.

The damping element is preferably detachably connected to the heald for carrying out the method, i. detachably held on this. It can be removed from its seat, for example, by slight elastic deformation. In this embodiment, there is no need for longitudinal movement of the damping element. However, it is also possible to move it longitudinally into its seat.

The movable damping element also allows a reduction in the vibrations of the healds during operation of the loom. This can lead to a better appearance of the goods. Tilting of the strands in operation are avoided as well as warp thread breaks.

In addition, the operating speed of the loom and thus the productivity of the same can be increased.

Further details of advantageous embodiments of the invention will become apparent from the drawings, the description and claims.

Figur 1

einen Webschaft in einer schematisierten Vorderansicht,

Figur 2

einen Schaftstab des Webschafts nach Figur 1 mit einer Weblitze in einer ausschnittswei- sen, schematisierten Vorderansicht,

Figur 3 und 4

eine erste Ausführungsform eines Schaftstabs mit beweglichem Dämpfungselement und unter- schiedlichen Dämpfungselementpositionen, in schematisierter und ausschnittsweiser Quer- schnittsdarstellung,

Figur 5 und 6

eine abgewandelte Ausführungsform eines Schaftstabs mit beweglichem Dämpfungselement in verschiedenen Positionen, in schemati- sierter ausschnittsweiser Querschnittsdar- stellung,

Figur 7

eine weiter abgewandelte Ausführungsform ei- nes Schaftstabs mit rundem, beweglich gela- gertem Dämpfungselement, in schematisierter, ausschnittsweiser Querschnittsdarstellung,

Figur 8

eine Ausführungsform eines Schaftstabs mit formschlüssig gefasstem, beweglich gelager- ten Dämpfungselement, in schematisierter ausschnittsweiser Querschnittsdarstellung,

Figur 9 und 9a

eine abgewandelte Ausführungsform eines Dämpfungselementes, in schematisierter Quer- schnittsdarstellung,

Figur 10

eine weitere abgewandelte Ausführungsform eines Dämpfungselementes, in schematisierter Querschnittsdarstellung und

Figur 11

eine weitere abgewandelte Ausführungsform eines Dämpfungselementes, in schematisierter Querschnittsdarstellung.

In the drawings, embodiments of the invention are illustrated. Show it:

FIG. 1

a weave in a schematic front view,

FIG. 2

a shaft rod of the weave post FIG. 1 with a heald in a fragmentary, schematized front view,

FIGS. 3 and 4

A first embodiment of a shaft rod with a movable damping element and different damping element positions, in a schematic and fragmentary cross-sectional representation,

FIGS. 5 and 6

4 shows a modified embodiment of a shaft rod with a movable damping element in various positions, in a schematic sectional cross-sectional representation,

FIG. 7

a further modified embodiment of a shaft rod with a round, movably mounted damping element, in a schematic, fragmentary cross-sectional representation,

FIG. 8

an embodiment of a shaft rod with a form-fitting, movably mounted damping element, in a schematic fragmentary cross-sectional representation,

FIGS. 9 and 9a

A modified embodiment of a damping element, in a schematic cross-sectional representation,

FIG. 10

a further modified embodiment of a damping element, in a schematic cross-sectional view and

FIG. 11

a further modified embodiment of a damping element, in a schematic cross-sectional view.

In FIG. 1 and in FIG. 2 a weaving shank 1 is illustrated which belongs to a weaving machine. The heald 1 is formed by an upper shaft rod 2, a lower shaft rod 3 arranged parallel thereto, and these side supports 4, 5 connecting at their ends. The shaft rods 2, 3 and the side supports 4, 5 define a rectangular frame.

On the shaft rod 2 and on the shaft rod 3, a respective Litzentragschiene 6, 7 is held, which extends parallel to the respective shaft rod 2, 3. The heddle rails 6, 7 are flat steel profiles, whereas the shaft rods 2, 3 are preferably formed by an aluminum extruded profile. The heald 1 has many parallel arranged healds 8, which sit with their end eyelets 9, 11 on the Litzentragschienen 6, 7.

On at least one of the shaft rods 2, 3, but preferably on both, in each case a damping element 12, 13 in the immediate vicinity of the end eyelets 9, 11 is arranged. The damping elements 12, 13 are connected to the shaft rods 2, 3 in an in FIG. 1 supported by an arrow 14 marked working direction of the hive 1 movably. The working direction coincides with the longitudinal direction of the side supports 4, 5 and the healds 8.

In the present embodiment, the shaft rods 2, 3 are formed equal to each other. It is therefore below representative of both shaft rods 2, 3 described only the shaft rod 2:

The in FIGS. 3 and 4 illustrated shaft rod 2 has a box profile-shaped support body 15, which is preferably extends with a constant cross-section over the entire length of the shaft rod 2. The carrier body 15 has, for example, a narrow respect. the direction of movement upright rectangular profile with two side walls 16, 17 on. In a straight extension of the side wall 16, a fastening web 18 extends in the manner of a plate from the underside of the carrier body 15 away. The fastening web 18 is formed integrally with the carrier body 15, for example. On one of its flat sides, a strip-like projection 19 is provided, which carries the heddle support rail 6. This extends parallel to the carrier body 15 and is located below its lower narrow side. Between this and the heddle support rail 6, a buffer space 21 is formed, into which the upper end eyelet 9 of the heald 8 projects with its head 22. This head is formed by a U-shaped bent portion of the end eye 9, which engages over the heddle support rail 6. In the present embodiment, the heddle support rail 6 is provided on its side facing the fastening web 18 with a wide groove-like longitudinal recess 23 into which a retaining lug 24 of the end eyelet 9 engages. The width of the longitudinal recess 23 decreases. the width of the retaining lug 24 determines the longitudinal play of the heald 8. However, this can if necessary be determined or limited otherwise.

In the buffer space 21 is a damping element 12, for example in the form of a trapezoidal cross-section rod made of damping material, such as plastic, a foamed plastic, provided with cavities plastic, a plastic fiber body or the like. The damping element may also be a rod or a strip made of a composite material (metal-plastic composite, eg steel core with plastic sheath), a sheathed foam body or a be coated fiber body. It is adapted to the buffer space 21 in its contour. At its side facing the planar fastening web 18 side, it has a plane surface. The carrier body 15 is provided on its underside outside with an oblique contact surface 26. Here, the damping element 12 on a contact surface, which is also oblique, that is, at an obtuse angle to the mounting web 18 is arranged. On the outside, which is oriented parallel to the side wall 17, the damping element 12 also has a flat surface. On the side facing the head 22, it may be provided with a strip-shaped planar surface or, if necessary, a convexly or concavely curved surface. It is essential that the in FIG. 3 illustrated, the maximum distance between the damping element 12 and the head 22 is smaller than the maximum play of the head 9 on the Litzentragschiene 6. In addition, the damping element 12 is movably mounted such that it due to its own weight and possibly its inertia, such as FIG. 4 shows, can lie on the heads 22 of the heddles 8 and even if the healds 8 are in their maximum distance from the support body 15 end position. Namely, these conditions that on the one hand, the distance between the damping element 12 and the head 22 of the heald 8 is smaller than the game of heald 8 on the Litzentragschiene 6, 7 and on the other hand, the damping element 12 rests on the heads 22 by gravity, lead in that the healds 8 are damped during the up and down movement and in the reversal points of the direction of movement. If the distance between the damping element 12 and the head 22 of the heald 8 greater than the game of heald 8 on the heald support rail 6, 7 so the heald is attenuated according to the invention by the support of the damping strip 12 on the same during the up and down movement of the heald 1 ,

In order to securely hold the damping element 12 in the buffer space 21, the shaft rod 2 is provided, for example, on its side wall 17 with locking plates 27 to 33 ( FIG. 1 ). These can be glued to the outside of the side wall 17. The locking plates 27 to 33 extend for a distance beyond the contact surface 26, which is greater than the maximum, from FIG. 4 apparent, stroke H of the damping element 12. The stroke H results from the distance measured from the upper edge of the heddle support rail 6 to the contact surface 26 less. the height of the damping element 12 and the height of the head 22. Thus, the locking plates 27 to 33 engage over the damping element 12 even when this is in its lowest position ( FIG. 4 ).

The weaving 1 described so far works as follows:

The heald 1 must first be equipped with healds 8 before it is used. These are pushed from the ends to the Litzentragschienen 6, 7. This is preferably done in the absence of at least the lower damping element 12, but preferably in the absence of both damping elements 12, 13. With a Fadeneinziehmaschine are then fed into the strands 8, ie in the thread eyes, warp threads. The warp threads are anxious to get really tense. They thereby move the healds 8 seated on the heddle support rails 6, 7 with great play until they have found their working position on the respective heddle support rail 6, 7. Now, the damping elements 12, 13 are inserted. This can be done by these, for example, by certain elastic deformation on the locking plates 27 to 33 in the buffer space 21st be pushed into it, where they are then loose. Alternatively, the damping elements 12, 13 are axially retracted. Further alternatively, it is possible to connect the locking plates 27 to 33 detachably connected to the carrier body 15, for example by screws. The locking plates 27 to 33 can then be removed to facilitate the insertion of the damping element 12, 13. If it is sufficiently flexible, it can also be introduced into the buffer space 21 by the gaps existing between the securing plates 27 to 33.

If the heald 1 is ready equipped, the weaving machine can start its proper operation. In this case, the heald 1 is very fast and with very abrupt movements in the direction of arrow 14 ( FIG. 1 ) moved back and forth. In each case at its upper and at its bottom dead center, the moving healds 8 must be braked and accelerated. Due to the gravity and the dead weight of the damping element 12 is the upper, designated in Figure 1 with 12 damping element during the complete up and down movement of the heald 1 directly to its associated end eyelets 9 of the strands 8. It thus has a calming, vibration-absorbing and dampening effect. In the reversal points of the direction of movement of the heald, the damping element 12, 13 meets the contact surface 26, whereby the movement of the damping element is limited. The strands 8 following the damping element 12, 13 are then intercepted relatively gently by immersing them a little way into the soft damping material and then accelerated again in the opposite direction. During the braking process, the strands 8 push the damping element 12 or 13 before it and are already damped thereby. They then meet with the damping element 12, for example, on the contact surface 26 and are here completely braked. This braking process, which initiates the change of the direction of movement, is less vibratory and softer from equip than would be the case for fixed mounting of the damping element 12, for example on the contact surface 26. It is essential in a shaft rod according to the invention with movable damping strip 12, 13, that the strands 8 taken from the support rails 6, 7, that are drawn, wherein in the reversal points of the direction of movement, the damping elements 12, 13 due to their elasticity may take over a short-term sliding function.

In FIGS. 5 and 6 is the shaft rod 2 with a modified embodiment of the heddle support rail 6 and corresponding strands 8 with modified end eyelets 9 can be seen. The end eyelets 9 enclose the heddle support rail 6 in a C shape. The game of strands 8 respect. The strand longitudinal direction results from the difference between the height of the heddle support rail 6 measured in the longitudinal direction of the strand (arrow 14) and the inner width of the end eye 9 measured in the same direction. This clearance S is greater than the maximum distance A between the damping element 12 and the head 22 The distance A results as the difference between the height of the buffer space 21 and the height of the damping element 12. The height of the buffer space 21 results from the distance measured from the contact surface 26 to the outer edge of the head 22 of the end eyelet 9, 11. As FIG 6, the damping element 12 can move freely in the buffer space 21 in the working direction (arrow 14) and find its abutment both on the abutment surface 26 and on the head 22. In the work of the loom, in which the heald 1 performs a swinging in the direction of arrow 14 movement, the damping element and the strands 8 lead their reciprocating motion together and largely together fitting, which results in the above-described damping effect also in this embodiment.

FIG. 7 illustrates a further modified embodiment of the shaft rod 2. This embodiment is based largely on the according to FIGS. 5 and 6 , the description applies accordingly. In addition, the description of the figures applies FIGS. 1 to 4 ,

The damping element 12 here has a circular cross-section. It again consists of a damping material. For example, it is formed by a plastic rod, a rubber rod or the like. On the support body 15 which is formed here as a rounded groove contact surface 26 is formed. Together with a flat wall-like rib 34 which extends at a distance parallel to the fastening web 18, it forms a receiving space for the damping element 12. This receiving space is part of the buffer space 21. In this embodiment, as in the previous embodiments, a certain clearance between the fastening web 18 and the front fastening elements (locking plates 27 to 33), which are here replaced by the rib 34. This goes through in the longitudinal direction of the shaft rod 2 uninterrupted.

Thus, an air cushion 35 is included between the contact surface 26 and the damping element 12, which can develop a certain buffer effect. The damping element 12 can move freely in the buffer space 21, so that it can rest on the head 22 or alternatively on the abutment surface 26. When the shaft rod 2 moves quickly, the damping element 12 initially abuts against the head 22. With abrupt braking of the shaft rod 2, as it changes the direction of movement occurs, push the damping element 12 and the healds 8 with their respective end eyelet 9, 11 in the buffer space 21 into it. As a result, the air cushion 35 is displaced. It has to escape the damping element 12 over, which has damping and thus shock-reducing effect, especially in very fast deceleration processes.

It is also possible that the rib 34 for the purpose of controlling the escaping air cushion 35 or the weight saving recesses or interruptions in the form of groove or slot-shaped recesses.

FIG. 8 illustrates a further modified embodiment of the shaft rod 2. On the basis of the same reference numerals for this embodiment, the above description applies accordingly. However, the rib 34 is here at its free end slightly inwardly bent onto the mounting web 18. At the appropriate location, this has a rib-like projection 36 which defines a slot with the rib 34. This opens to the heald bar 6 back. Preferably, it lies with this in a common plane. However, it can also be arranged slightly offset as shown.

As a damping element 12 here is a profile element with a damping pad 37, to which a slit cross-rib 38 connects. This protrudes perpendicularly from the damping pad 37. The web 38 extends into one of the rear wall 18 on the one hand and the rib 34 on the other hand enclosed interior 39, which is closed at the top by the contact surface 26. At this is a bead-headed head portion 41 its attachment, which is integrally formed on the free end of the web 38.

The damping element 12 has a play to be measured in the working direction (arrow 14). The play area of this damping element 12 overlaps, as in all the embodiments described above, with the play area of the end eye 9, ie the damping element 12 and the head 22 can rest against each other in any position within the buffer space 21. Also in this embodiment, as in the embodiment according to FIG. 7 in addition to the mechanical damping a pneumatic damping effect can be achieved.

FIG. 9 shows a damping element 12 in which a certain mobility is provided by means of a cavity 42. This damping element 12 can in the shaft rod configurations of FIGS. 3, 4 . 5, 6 and find other application. Thus, the above description applies accordingly. With appropriate flexibility of the damping element 12, the distance between the damping element 12 and head 22 of the heald 8 can be reduced to zero. However, this is not mandatory. A reduction of the distance between the damping element 12 and head 22 of the heald 8 to zero means that the damping strip 12 is constantly applied to the heald 8, thus damping it during the up and down movement, and that the damping element 12 in the reversal points of the direction of movement is compressed, wherein the cavity 42 is deformed ( FIG. 9a ) and the first approximately parallel side walls 44, 45 are pressed outward to assume an arcuate shape.

FIG. 10 shows a modified form of a damping element 12, which is pressed by spring force 43 in the direction of the heald 8. Again, it is like the damping element 12 after Figure 9, 9a possible to reduce the distance between the damping element 12 and the head 22 of the heald 8 to zero, which is not a requirement for a shaft rod according to the invention. According to the invention, this damping strip is due to its own weight and inertia on the head 22 of the heald 8 and attenuates them during the up and down movement of the same. If the distance between the damping element 12 and the head 22 of the heald 8 is less than the play of the heald 8 on the heald support rail 6, 7, the heald 8 is damped at the reversal points of the direction of movement by means of the spring force 43. This spring force can be applied by means of several spring means. Is the damping element 12 under bias of the spring force on the heald 8, so the damping effect is enhanced. The damping element 12 accordingly FIG. 10 can in the shaft rod configurations of FIGS. 3, 4 . 5, 6 and find other application. The springs 43 may also be kept short and thus at rest with play in order to be active only in the reversal points.

Out FIG. 11 is a damping element 12 can be seen, with which different damping effects are achieved depending on its installation position. Also, this damping element 12 is movably mounted in the buffer space 21 and is due to its gravity on the head 22 of the heald 8 at. Thus, the damping element 12 attenuates the heald 8 during the up and down movement of the heald 1. In the reversal points of the direction of movement of the heald 8 is when using a damping element 12 after FIG. 11 The damping effect depends on the installation position of the damping element 12. In order to achieve different damping effects, the inherently cuboid damping element 12 has damping regions 50, which in this example on its outer surfaces 47 in FIG Shape of recesses 46 are designed, for example, as beads. These beads 46 can be different deep. The shape of the bead 46 is adapted to the shape of the end of the head 22 of the heald 8, or slightly larger. At the time in the movement sequence in which the damping element 12 is in contact with the contact surface 26, determines the depth D of the beads 46 the time at which the heald 8 with its head 22 tries to penetrate into the damping element 12. This is the phase in which damping occurs due to the elasticity of the damping strip 12. This elasticity is determined by the material properties of the damping strip 12 and / or by its shape. For example, if the depth D of the bead 46, which is in contact with the contact surface 26, zero, the damping is essentially only influenced by the material properties of the damping element 12. In contrast, if the depth D is very large, for example, it corresponds to half the height of the damping element 12, the damping is largely determined by the shape of the damping element 12. The beads 46 of the damping element 12 may be of different depths, so that depending on the installation position with a damping element 12 different damping effects can be achieved.

A heald 1 comprises at least one shaft rod 2 to which a damping element 12 relates. the strand longitudinal direction is movably mounted. Due to the movable mounting of the damping element 12, the alignment of the strands 8 is improved and facilitated and achieved a desired damping effect over the entire movement of the heddles 8.

LIST OF REFERENCE NUMBERS

1

heald

2, 3

stave

4, 5

side supports

6, 7

shaft stave

8th

healds

9, 11

end loops

12, 13

Damping element, strand damping element

14

Arrow (for the working direction)

15

support body

16, 17

side walls

18

fastening web

19

head Start

21

buffer space

22

head

23

longitudinal recess

24

retaining nose

26

contact surface

27 to 33

Tab washers

34

rib

35

bubble

36

head Start

37

cushioning pad

38

web

39

inner space

41

head area

42

cavity

43

spring element

44, 45

Side wall

46

Recess, bead

47

outer surface

A

distance

H

stroke

S

game

D

depth

Claims (15)

1. Heald frame rod (2), in particular for a heald frame (1) of a weaving machine,
   with a support body (15), which bears a heald bar (6) or on which a heald bar (6) is configured,
   with at least one heald damping element (12), which is held on the support body (15), characterised in that the heald damping element (12) is held to be movable transversely to the support body (15).
2. Heald frame rod according to claim 1, characterised in that the heald damping element (12) is disposed to be movable in the longitudinal direction (14) of the heald.
3. Heald frame rod according to claim 1, characterised in that the heald bar (6) is configured in such a manner that the healds (8) are held on the held bar (6) with a given play (S) in the longitudinal direction (14) of the heald.
4. Heald frame rod according to claim 1, characterised in that for the movable arrangement of the damping element (12) a mounting (27-33) is provided, which allows a movement of the entire damping element (12) into a position close to the heald bar (6) and a counter-movement of the damping element (12) into a position remote from the heald bar (6).
5. Heald frame rod according to claim 1, characterised in that the damping element (12) is held in a chamber, into which it penetrates with a displacement of air during its movement directed away from the heald bar (6).
6. Heald frame rod according to claim 1, characterised in that the damping element (12) is held in a longitudinally displaceable manner.
7. Heald frame rod according to claim 1, characterised in that the damping element (12) is held in a frictionally engaged manner to assist the damping.
8. Heald frame rod according to claim 1, characterised in that the damping element (12) is held positively with play.
9. Heald frame rod according to claim 1, characterised in that the damping element (12) is made from a flexible material.
10. Heald frame rod according to claim 1, characterised in that the damping element (12) has a deformable hollow space (42).
11. Heald frame rod according to claim 1, characterised in that the damping element (12) is movably held against spring force (43).
12. Heald frame rod according to claim 1, characterised in that the damping element (12) has at least two outside faces (47), which differ in shape from one another.
13. Heald frame rod according to claim 1, characterised in that the damping element (12) has at least two damping regions that dampen in a different manner.
14. Heald frame with a heald frame rod according to one of claims 1 to 13.
15. Method for fitting a heald frame with healds and/or for inserting threads into the healds,
    in which the fitting process and/or the insertion process is conducted on a heald frame, in which the damping element is removed from its at least one heald frame rod, wherein after completion of the fitting and/or insertion process the damping element is mounted on the heald frame rod.

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