EP1620586B1 - Heald shaft for a weaving machine - Google Patents

Abstract

Holding devices are provided for detachable fastening heald carrying bars (8) on heald staves (2) of a shaft (1) of a weaving machine. These holding devices consist of, for example, two metal sheets of which one part forms an adhering surface for joining to the heald stave (2). The remaining part serves to accommodate metallic reinforcing strips (rib (31, 32)) that can be riveted or welded to the metal sheet. These reinforcing strips serve to accommodate fastening elements for a plate and to position this plate. The positioning is realized in a positive manner. The metal sheets are preferably tightened against the plate by means of screws in order to positively fix them in the designated position. Alternatively, rivets can be also be used that can be removed, as required, by means of simple tools, for example, by pressing them out. The reinforcing strips are designed and fixed to the metal sheets in such a manner that the reinforcement simultaneously serves to precisely position the plate (22) in order to positively prevent a vertical displacement of the plate during the operation of the heald shaft.

Description

The invention relates to a shaft which is used in particular on weaving machines.

To shed have weaving shafts, on which several strands are held, which guide the warp threads. Such a shaft is for example from the DE 196 07 532 A1 known. The shaft has an upper and a lower shaft rod oriented transversely to the direction of movement of the shaft, the two shaft rods spaced parallel to one another connected at their ends in each case via so-called side supports are. As a result, an approximately rectangular frame is formed in front view. In this a strand support rail are attached to both the upper shaft rod and the lower shaft rod. Between the Litzentragschienen strands are held, which hang with their end eyelets each on the mounting rail. Each strand has a thread eye or eyelet for a warp thread.

The Litzentragschienen are provided with tabs that connect to the shaft rods. Each lug connected to the Litzentragschiene is associated with a arranged on the shaft rod socket. Coupling devices each serve for the positive connection between each socket and the respectively associated tab. The shaft rods each have two flat sides and a narrow side arranged between them, which faces the heddle support rail. On this narrow side, the sockets are screwed by means of bolts.

In this shaft, the coupling device is formed in a first embodiment by a rectangular bolt which is pushed parallel to the Litzentragschiene through openings of the socket and the tab. In another embodiment, the socket has an eyelet in which the tab is hung like a hook. In both embodiments, the connection between the tab and the socket on a certain game. This way of supporting the heddle support rail on the shaft rod limits the speed range in which the shaft can be inserted.

In addition, this type of connection between the shaft stave and the shaft rod requires a massive design of the shaft rod, so that it can safely carry the bolt anchored on its narrow sides.

From the U.S. Patent 4,404,995 is a shaft with shaft rods known, which are formed as rectangular hollow profiles. To attach the DIN rail is a from a narrow side of the Shank extending away leg, which is formed over the entire length of the shaft rod and integrally connected thereto. At this leg, the heddle support rail is held by means of a rivet connection.

As a result, the entire heald must be replaced when the heald support rail is worn. Especially in high-speed applications, however, the wear of the mounting rails can already be done after a relatively short period of use. In addition, the longitudinal leg contributes to the weight of the shaft, which is noticeable in rapid shaft movements.

Also in the utility model 1 799 695 a firm connection between the shaft rod and the Litzentragschiene is provided. For this purpose serve tabs which are riveted at one end to the heddle support rail and at its other end to the shaft rod. If the heald bars are worn, the entire heald frame must be replaced.

Next is from the JP 59-149982 a shaft for a loom, in which the shaft rod is formed by a rectangular hollow profile. Its the heddle support rail facing wall is thickened, so that spaced-apart holder can be embedded in this wall and positively anchored with a thickened head in this wall. The holders are angled down and have threaded holes. The Litzentragschiene is bolted here with the holders.

In this solution, it is important that the holes for the mounting screws in the shaft support rail and in the holders match each other with high accuracy.

From the CH 331474 For this purpose, a shaft is known, the shaft rods of which each have a web to be extended to the shaft support rail. In this web fastening bolts are inserted, to the connecting straps for the heddle support rail can be screwed. The connecting straps carry slots to allow tolerance compensation.

The solutions mentioned for the connection between the heddle support rail and the shaft rod, as far as they are based on the screwing of sockets or the direct screwing of the tabs, in common that a massive wall must be present on the shaft rod, which can absorb the forces emanating from a fastening screw , This limits the design of the shaft rod and in particular with regard to its choice of material and wall thicknesses. This leads to a considerable shaft weight, which limits the operating speed of a loom. This also applies to the solution according to the JP 59-149982 ,

The US-A-4,706,717 discloses a shaft rod which is formed as a hollow profile. On the shaft rod a Litzentragschiene is mounted. To connect the heddle support rail with the shaft rod serve metal tabs which extend into the interior of the shaft rod into it. In the shaft rod a plurality of blocks are arranged stationary, which are encompassed by a rectangular section of the respective tab. Through a given axial play the tabs on the blocks can slide sideways, allowing dynamic bending deformations of the shaft rod without upsetting or stretching the heddle support rail.

On this basis, it is an object of the invention to provide a shaft which opens the possibility to make shaft rods with particularly weight-saving construction.

This object is achieved with the shaft according to claim 1:

The shaft according to the invention has between its heddle support rail and its shaft rod at least two connecting devices, which are laterally spaced from each other and each connect the heddle support rail with the shaft rod. The Connecting means are separated from the shaft rod separate parts which are integrally connected to the shaft rod. Preferably, the connection is exclusively cohesively, that is formed without the support of a positive engagement or the like. The wall and any insets of the shaft rod remain uninjured. The cohesive connection is further preferably purely superficial and at least line, but preferably planar. It is thereby causes an introduction of force into the outer skin of the shaft rod, without this would have to have openings or openings. The connection is thus preferably made on a closed surface of the shaft rod. These measures open up a wide scope for the shaft rods, in particular with regard to their choice of material and with regard to their internal structure. For example, the shaft rod made of fiber-reinforced plastic, such as carbon fiber reinforced plastic or glass fiber reinforced plastic, are formed to combine high strength with low weight.

The mechanical connection of the shaft rod to the replaceable heddle support rail via tabs, wherein the tabs form the connecting element or belong to such. They are in the first case directly and in the second case indirectly via a socket with the shaft rod firmly bonded. This principle can also be applied if the shaft rod is an otherwise constructed lightweight construction. For example, it may be formed by a metal honeycomb structure. Such is formed for example by two spaced parallel to each other sheets (preferably steel sheets), between which honeycomb formed from thin sheet metal or plastic reinforced paper, eg hexagonal honeycombs are arranged. At the upper and lower ends of the existing gap between the two sheets may be closed by plastic elements. The connecting device preferably engages over the shaft rod on both sides, so that two leg-like extensions receive the shaft rod between one another and on its flat sides issue. The connection can be made here, for example, by a laminar bond or by laser welds. The laser welds can be guided both along the edge of the extension as a seam along. You can also lead over the surface of the extension. In any case, the connection here is limited to one or more strip-shaped areas. However, this is sufficient for power transmission even when the shaft rod is an extreme lightweight metal construction (structures with foam-filled spaces).

The welded connection can be produced by means of laser or electron beam. If the shaft rod is formed of fiber-reinforced plastic, the bonding of the connecting device or the lamination or bonding of the same into the fiber-reinforced plastic body takes place without injury to fibers, which guarantees its strength.

If the shaft rod is formed by a plastic profile, the connecting device can also be embedded in the shaft rod and thus glued to it. This also makes a good power transmission can be ensured. The connection between the connecting device and the shaft rod is also carried out preferably only by material connection and not by positive locking in order to achieve the largest possible application of force.

Preferably, the connecting device is formed at least in two parts, so that it is divided into a tab and a socket, which are detachably connected to each other. This opens up the possibility of the socket on the one hand and the tab on the other hand in each case inextricably linked to the shaft rod or the Litzentragschiene. Between the socket and the tab, a coupling agent is effective, which is preferably formed without play. For example, both a positive connection and additionally a clamping effect can be used here. This is possible by the socket, for example, has two legs, which between each other a receiving space for a coupling portion set the tab. The legs may be associated with a clamping means for clamping the coupling portion, whereby this is held without play in the coupling position. Such compounds enable the transmission of the forces occurring at high operating speeds and thus high accelerations. The solid and backlash-free connection between the shaft support rail and the shaft rod, which results, allows high engine speeds.

On the other hand, it is possible, without damaging the shaft rod to solve the heddle support rail and new Litzentragschienen dimensionally fixed again .. The latter is particularly possible when the coupling device determines the coupling position form fit. The positive position fixing preferably does not relate to the longitudinal position of the heddle support rail. This can be achieved by a rib is formed as a positive locking element on the socket, which extends parallel to the shaft rod and is associated with a formed in the coupling portion groove. Alternatively, a groove can also be provided on the socket and a corresponding rib can also be provided on the coupling section of the tab. In both cases, a certain longitudinal play is possible, which makes the replacement of the heddle rail simple. It is only to insert the coupling portions of the tabs in the corresponding versions, after which the clamping means provided on the versions are to be tightened.

The connecting device may be wholly or partly made of plastic. For example, the socket and / or the tab may be formed of plastic. This dampens and changes vibrations that are generated by the strands on the shaft stave. These vibrations are thus not conducted by the plastic in full effect on the shaft rod and thereby reduce its load. In addition, the measure has a sound-damping effect.

Figur 1

einen Schaft für eine Webmaschine in einer schematisierten Vorderansicht,

Figur 2

den Schaft nach Figur 1 in einer ausschnittsweisen und geschnittenen Perspektivdarstellung,

Figur 3

den Schaftstab nach Figur 2 in einem anderen Maßstab unter Darstellung verdeckter Körperkanten,

Figur 4

den Schaftstab und die Litzentragschiene nach Figur 2 und 3 in einer Schnittdarstellung,

Figur 5 bis 8

abgewandelte Ausführungsformen des Schafts, jeweils in ausschnittsweiser Schnittdarstellung.

Further details of advantageous embodiments of the invention will become apparent from the figures, the description of the figures or subclaims. In the drawings, embodiments of the invention are illustrated. Show it:

FIG. 1

a shank for a loom in a schematic front view,

FIG. 2

the shaft after FIG. 1 in a sectional and cut perspective view,

FIG. 3

the shaft rod after FIG. 2 on a different scale, showing hidden body edges,

FIG. 4

the shaft rod and the shaft stave after FIG. 2 and 3 in a sectional view,

FIGS. 5 to 8

modified embodiments of the shaft, in each case in a sectional sectional view.

In FIG. 1 is a shaft 1 illustrated, which has an upper, usually horizontally arranged shaft rod 2 and a parallel spaced parallel to the shaft rod 3. The shaft rods 2, 3 are connected to each other at their ends by side supports 4, 5, so that they form a rectangular frame together with the shaft rods 2, 3. In this a plurality of mutually parallel strands 6 are arranged, which are each provided with a thread eye 7 for guiding a warp thread. The strands 6, which are arranged parallel to the side supports 4, 5, each have an end eye at their upper and lower ends, with which they are held on a heddle support rail 8, 9. The Litzentragschienen 8, 9 extend parallel to their respective adjacent shaft rods 2, 3 and are held at a distance therefrom. Serve connection means 11, 12, 13, 14, each providing a releasable connection between the respective shaft rod 2, 3 and the associated associated Litzentragschiene 8, 9. Each Litzentragschiene 8, 9 are assigned at least two connecting devices 11, 12 and 13, 14. The connecting device 11 will be described below by way of example for the remaining connecting devices 12, 13, 14. Description parts that relate to the shaft rod 2 apply equally to the shaft rod. 3

At the in FIG. 1 illustrated embodiment of the shaft 1, the shaft rod 2 is designed as a lightweight profile. This includes two flat body, for example in the form of sheets 15, 16, for example made of stainless steel, which are held at a distance parallel to each other and which form the flat sides of the shaft rod 2. Spacers, for example in the form of a honeycomb arrangement 17, are provided between the sheets 15, 16 and are glued or otherwise connected to the sheets 15, 16. At the end of the space enclosed by the sheets 15, 16 interior can be at the top and bottom Narrow side of the shaft rod 2 each have a plastic body 18, 19 glued in with a rectangular or square profile.

To the connecting device 11, in particular also from FIG. 3 As can be seen, include a socket 21 and a tab 22, which are interconnected by a coupling device 23.

The socket 21 is either in one piece or, as shown in Figures 3 and 4, formed in two parts by having a first socket member 24 and a second socket member 25, both of which are each formed by a flat leg. Each leg has a flat, resting on the plate 15 and 16 section, which forms an anchoring portion 26, 27. The socket elements 24, 25, which together form the socket 21, are constructed symmetrically to one another. Their anchoring portions 26, 27 are at the in FIG. 3 and 4 illustrated embodiment, surface glued to the plate 15 and 16 respectively. The adhesive is in each case in the joint between the anchoring portion 26 and the plate 15 and in the joint between the anchoring portion 27 and the plate 16. It serves the cohesive connection and for the transmission of longitudinal forces in FIG. 4 lying vertically in the plane of the drawing.

The socket elements 24, 25, in FIG. 3 and 4 as independent separate elements are illustrated, may also be interconnected by a web, which then rests against the lower plastic body 19 or defines a gap to this. In the illustrated embodiment, each leg 28, 29 of the socket elements 24, 25 protrude beyond the lower narrow side of the shaft rod 2. The legs 28, 29 can slightly feather towards each other and away from each other, in which case a possible spring stroke of a few tenths of a millimeter is sufficient. The legs 28, 29 form a Half of the coupling device 23, which serves to connect the tab 22. The legs 28, 29 contribute to this on their sides facing web-like ribs 31, 32, for example, have a rectangular cross-section and parallel to the longitudinal direction of the shaft rod 2, ie in FIG. 4 extend perpendicular to the plane of the drawing. They are also aligned parallel to each other and close to each other and to the shaft rod 2 through, in each case a distance. The ribs 31, 32 are fixedly connected to the legs 28, 29, for example by rivets or welded joints. Its cross section may also be trapezoidal or otherwise defined.

The tab 22 is provided with a coupling portion 33 which forms the other half of the coupling device 23. The coupling portion 33 has a rectangular base profile, which is provided on both opposite flat sides with grooves which match exactly to the ribs 31, 32. Thus, the coupling portion 33 is replaced by an I- or H-shaped cross section, which fits between the legs 28, 29 with little play. He can thus in the rib longitudinal direction, ie in FIG. 4 perpendicular to the plane between the legs 28, 29 are inserted to first make a positive connection between the tab 22 and the socket 21.

To secure the tab 22 on the socket 21 are used in Figure 4 indicated by dashed lines fastening bolts 34, 35 (see FIG. 2 . 3 ), which pass through both the legs 28, 29 and the coupling portion 33. The fastening bolts 34, 35 sit in bores or threaded bores, which preferably pass through the ribs 31, 32. The rib 31 is preferably formed somewhat thicker than the rib 32. As a result, a sufficient height for the formation of a threaded bore is achieved.

The fastening bolts 34, 35 form clamping means in order to clamp the legs 28, 29 against each other and thus against the coupling section 33 and clamp them free of play.

Of the coupling portion 33, a flat portion of the tab 22 preferably extends off-center, ie approximately in the plane of the sheet 16 away. This section, like the entire remaining tab 22, may be made of plastic or else of light metal, for example aluminum. At its free end, the tab is provided with a projection 36 which points to a plane defined by the plate 15. The projection 36 serves as a plant for the heddle support rail 8, which is designed as a flat profile with rounded edges. The projection and the Litzentragschiene are provided with aligned openings into which a rivet 37 is inserted for fixed connection. As FIG. 2 and 3 can illustrate further rivets 38, 39 may be provided.

Function:

In operation, the Litzentragschienen 8, 9 are held firmly on the shaft rods 2, 3 via the connecting means 11, 12, 13, 14. The sockets 21 are glued to the shaft rods 2, 3. The tabs 22 are positively and non-positively clamped by the coupling means 23 between the legs 28, 29. The force introduction of the outgoing of the shaft support rail 8 forces superficial in the surface 15, 16. The internal structure of the shaft rods 2, 3 is not affected.

After a certain period of operation, it may happen that the heddle support rail 8 shows signs of wear. It can be replaced in the simplest way by the coupling device 23 is released by removing the fastening bolts 34, 35. The heald support rail 8 can now be uncoupled by being moved slightly in the longitudinal direction. The coupling portion 33 slides out of the space enclosed by the legs 28, 29 gap and is thus released. A new Litzentragschiene with new tabs 22 is used in reverse and tightened again.

In this shaft, the Litzentragschienen 8, 9 can be replaced if necessary. The shaft rods 2, 3 are not affected. They can therefore be formed from expensive lightweight materials if necessary.

In a modified embodiment, the basic structure of the in the FIGS. 1 to 4 illustrated embodiment and in FIG. 8 is shown separately on the basis of the same reference numerals, the anchoring portions 26, 27 of the socket elements 24, 25 are not by gluing but by welds S to the sheets 15, 16 attached. The welds can be guided along the outer edge of the anchoring sections 26, 27. They can also be guided in the form of one or more mutually parallel lines L over the surfaces of the anchoring sections 26, 27.

In FIG. 5 a modified embodiment of the shaft is illustrated with reference to its shaft rod 2 and the shaft support rail 8. For the shaft rod 2 and the socket 21 previous description is complete. To improve clarity, a representation of the fastening bolts 34, 35 has been omitted. The tab 22 is made of plastic. In the region of its projection 36 it is provided with a metal insert 41. At this, the heddle support rail 8, as shown, be secured by means of a weld 42 or a series of individual welds. A further modified embodiment is in FIG. 6 illustrated. Unless expressly explained below differences apply to the FIGS. 1 to 4 given description based on the same reference numerals.

The tab 22 is formed by a bent steel strip, which is connected at its lower end via a weld 43 with the Litzentragschiene 8. The weld can, as shown, starting from the tab 22 or, if necessary, also be prepared starting from the Litzentragschiene 8. The bend the tab 22 provides the necessary clearance between the heddle support rail 8 and the tab for receiving the end loops of the strands. At its upper end, the tab is provided with holes 44 for the fastening bolts 34, 35. The thickness of the tab 22 corresponds to the distance of the ribs 31, 32 from each other. It is clamped between the ribs 31, 32 frictionally. On a positive connection, as it is achieved by the ribs 31, 32 above and below cross-part of the coupling portion 33, has been omitted here. Nevertheless, the upper end of the tab 22 forms a coupling portion 33.

In FIG. 7 a further modified embodiment is illustrated. The peculiarity here is that the connecting device 11 is integrally formed, that is not divided into socket and tab. Rather, a bifurcated portion 45 is integrally formed on the actual tab 22, which is preferably made of plastic, the two legs 46, 47 engage over the shaft rod 2 at its flat sides. The legs 46, 47 are thus on the sheets 15, 16 and are adhesively bonded here with these areal. The attachment of the heddle support rail 8 is again at the lower end of the tab 22. Preferably, instead of the rivet 37, a screw 48 is provided with countersunk head, which is fastened in a threaded bore with metal wall and / or in a threaded bore of a metal insert 49 of the connecting device 11 , Even then, an adhesive bond to the sheets 15, 16 are produced. Alternatively, a welded joint is possible.

For releasably securing healds 8 to shank rods 2 of a shank 1 of a weaving machine, brackets are provided which, in a preferred embodiment, essentially consist of two sheets, one of which forms an adhesive surface for connection to the shank rod 2. The free-lasting part, ie the free longitudinal edge of the sheets, serves to receive a respective metallic reinforcing strip (rib 31, 32), which can be riveted or welded to the sheet metal. These reinforcing strips serve on the one hand to receive fasteners for a tab and on the other hand to position this tab. The positioning is thus achieved positively. The sheets are preferably clamped by means of screws against the tab to clamp them in the form-fitting fixed position. Alternatively, rivets can be used, which can be solved, if necessary, with simple tools, for example by expressions. The reinforcing strips are designed and fixed to the sheets, that the reinforcement at the same time serves for the exact positioning of the tab 22 to positively prevent a vertical displacement of the tab during the operation of the weaving shank. For example, can be solved by expressions. The reinforcing strips are designed and fixed to the sheets, that the reinforcement at the same time serves for the exact positioning of the tab 22 to positively prevent a vertical displacement of the tab during the operation of the weaving shank.

LIST OF REFERENCE NUMBERS

1

shaft

2, 3

stave

4, 5

side supports

6

strands

7

thread eye

8, 9

shaft stave

11, 12, 13, 14

connecting devices

15, 16

sheets

17

honeycomb arrangement

18, 19

Plastic body

21

version

22

flap

23

coupling device

24, 25

Sensing part

26, 27

anchoring section

28, 29

leg

31, 32

ribs

33

coupling section

34, 35

mounting bolts

36

head Start

37, 38, 39

rivet

41

metal insert

42, 43

Weld

44

drilling

45

section

46, 47

leg

48

screw

49

metal insert

51

head Start

52

extension

S

welds

L

lines

Claims (10)

1. Heald frame (1), in particular for weaving machines,
   with at least one heald frame rod (2),
   with at least one heald bar (8), to which healds (6) are to be fastened at their end eyelets, and
   with at least two connection devices (11, 12), which are laterally spaced from one another and respectively connect the heald bar (8) to the heald frame rod (2) and have anchoring sections (26, 27), which are connected to the heald frame rod (2), wherein the heald frame rod (2) has at least two parallel flat sides pointing away from one another,
   characterised in that
   the flat sides both have respective anchoring sections (26, 27) of the connection device (11) engaging over them, and
   that the anchoring section (11) is integrally connected to the flat sides of the heald frame rod (2).
2. Heald frame according to claim 1, characterised in that the connection devices (11, 12) are welded to the heald frame rod (2).
3. Heald frame according to claim 1, characterised in that the connection devices (11, 12) are glued to the heald frame rod (2).
4. Heald frame according to claim 1, characterised in that the connection devices (11, 12) are set into the heald frame rod (2) and glued thereto.
5. Heald frame according to claim 1, characterised in that the connection device (11, 12) is formed by a butt strap (22) and a mount (21), which are detachably connected to one another.
6. Heald frame according to claim 5, characterised in that the mount (21) is non-detachably connected to the heald frame rod (2).
7. Heald frame according to claim 5, characterised in that the butt strap (22) is non-detachably connected to the heald bar (2).
8. Heald frame according to claim 5, characterised in that the mount (21) is positively connected to the butt strap (22).
9. Heald frame according to claim 5, characterised in that the mount (21) has two legs (28, 29), which between them have a receiving area for a coupling section (33) of the butt strap (22), wherein the legs (28, 29) can be clamped against one another by a clamping element (34, 35) to clamp the coupling section (33).
10. Heald frame according to claim 9, characterised in that a rib (31), which extends parallel to the heald frame rod (2) and has an associated groove configured in the coupling section (33), is configured on at least one leg (28).

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