EP1514960A2 - Low vibration shedding system - Google Patents

Abstract

A rod-linkage (2) comprises at least one connecting strap assembly (16) containing a sandwich structure (37) orientated in longitudinal direction of the strap assembly. The sandwich structure includes at least one two-dimensional oscillation-absorbing element (34) disposed between two two-dimensional extensions or wall portions (27, 31) of rigid material. The wall portions are attached to respective ends (17, 19) of strap assembly. The wall portions are embodied as wedge-shaped in opposite directions in the longitudinal direction.

Description

The invention relates to a transmission for driving a Weave of a loom.

Weaving machines have so-called subject imaging systems, which serve to warp up or down from the To move out warp level around a so-called drawer to form the entry of a weft thread. The weft insertion systems, who work with water or air, for example, have a performance potential for highest weaving speeds on. But this potential can not usually be exhausted, because the existing Fachbildesysteme resulting from excessive working speed Loads can not withstand. The burdens arise from the accelerations when moving up and down the shafts with which the strands are held. The Movement is by so-called eccentric or Dobby produced. Even if this is as harmonious as possible Movements are aimed at and realized but in the shedding system and the associated gear, which connects the heald frames with the eccentric machines, vibrations. These load all elements of the tray system and lead to premature wear or breakage of components. Litzenbrüche, warp breaks and resulting Machine downtime results from such inflated Charges.

About the reduction of wear on the shedding system and the reduction of vibrations has been considered several times been:

For example, CH 558 435 is a weaving sheave drive known to the one between the Webschaft and a Stem transmission arranged linkage heard. The linkage contains a tab in which a shock absorber is installed. The shock absorber can in a variant as a rubber block be educated. This then connects two of this extending rigid halves of the tab.

Such a rubber block causes sufficient Vibration damping only at considerable axial compliance, which detrimental to the precision of the shaft movement is. It also provides an additional mass to move in cooperation with other elements, such as playful connections, again source of vibrations can be.

From the utility model 7832785 is also a linkage known for driving a hive, in which arranged under the shaft angle lever via push rods connected to the shaft. In the upper eye or Joint of each push rod are elastic elements in shape arranged by vulcanized bodies. The damping elements are thus located at the exit of the linkage, which is the Dobby connects with the heald.

From the utility model DE 29611305 is a device known for vibration damping of heald, at the at the kettbaumseitigen guide surface of guide pieces arranged the weaving vibration damping devices are. These are for example by a soft rubber plate educated. A provided on the weave guide piece runs along the soft rubber plate, causing in Warp direction running oscillations of the heald frames can be contained.

From CH-PS 549 668 is a linkage for the drive of a weave known in place of conventional Hinge joints spring joints has. These are through Leaf springs or rubber blocks formed. The measure serves the reduction of the otherwise encountered wear on the Joints. In addition, the need for lubrication slow reciprocating joints largely avoided become.

From EP 0 870 856 A1 is a for driving a Webschaft provided linkage known that over a sprung Tab is connected to the shaft drive. Is to the tab divided into two parts between those Compression spring package is effective.

The resilience of such a spring package may be undesirable be.

From this, the invention is based Task from which a transmission for transmitting a hinund forthcoming drive movement of a dobby or to create another drive on a hive is, the transmission also very fast shaft movements should allow.

This object is achieved with a transmission dissolved in the power transmission path at least one tab with longitudinally oriented sandwich structure consisting of different materials is arranged. At least one of the materials used has vibration-absorbing Properties on. As a result of the longitudinal orientation is on the one hand a lightweight low-mass construction and on the other hand achieved a good vibration absorption. It is special possible to give the flap a high axial rigidity, on the other hand, good vibration absorption properties are reachable. This allows the transmission high axial forces to achieve very fast shaft movements, without accepting positioning inaccuracies, the excitation of vibrations as a result of the jerky Movements through the tab can be greatly reduced.

Preferably, the absorber element is planar designed as a closed surface. It can however also as Honeycomb or as a flat, with openings or recesses be provided provided part. It is preferably from a natural or synthetic Elastomer e.g. Natural rubber. It's with the metal or a rigid plastic existing adjacent elements, e.g. area cohesive by gluing or Vulcanization, connected. Alternatively it can also by Rivets or other form-locking connection means held between the other elements of the sandwich assembly be. However, preferred is an arrangement in which the Connection between the two flap parts completely and exclusively by the vibration-absorbing element is created. In such an arrangement, all run in between forces acting on the ends of the tab exclusively through the body of the vibration absorbing element. Detours or other connections between the ends of the flaps, which could be vibration-transmitting, exist Not.

The tab may be stiffer wall areas of a metal or a rigid plastic, wherein the Vibration absorptive planar absorber element made of rubber or other elastomer is formed. It may be the longitudinally extending rigid wall areas be wedge-shaped, which is a particularly good Vibration absorption allows. It is preferred that stiff wall areas, for example, as parallel-sided Form plate whose longitudinal edges angled for stiffening. The e.g. square angled edges may be wedge-shaped, i.e. its free edge then runs at an acute angle to the remaining planar rigid wall area and thus to the Longitudinal direction. The tab described is preferably in arranged directly on a dobby, to a vibration transmission from the dobby on to prevent the linkage from the outset. In the linkage Further tabs according to the invention can be arranged. In addition, it is possible to take further attenuation measures to meet. For example, bearings of angle levers or of joints in damping elements, e.g. Rubber rings to sit.

Figur 1

einen Webschaft mit Gestänge und Schaftmaschine in schematisierter Vorderansicht,

Figur 2

eine Lasche des Gestänges nach Figur 1 in perspektivischer Ansicht,

Figur 3

die Lasche nach Figur 2 in einer ausschnittsweisen Draufsicht in einem anderen Maßstab,

Figur 4 und 5

abgewandelte Ausführungsformen der Verbindungslasche jeweils in abschnittsweiser Draufsicht,

Figur 6

eine weitere Ausführungsform einer erfindungsgemäßen Lasche im Längsschnitt,

Figur 7

eine Ausführungsvariante der Lasche nach Figur 6 in Draufsicht,

Figur 8

eine weitere Ausführungsvariante der Lasche nach Figur 6 in Draufsicht,

Figur 9

eine Ausführungsform der erfindungsgemäßen Lasche mit symmetrischem Längsschnitt,

Figur 10

die Lasche nach Figur 8, geschnitten entlang der Linie X-X,

Figur 11

die Lasche nach Figur 8, geschnitten entlang der Linie XI-XI,

Figur 12

eine wechselsymmetrische Ausführungsform der Lasche in einer perspektivischen Ansicht ihrer vorderen Flachseite,

Figur 13

die wechselsymmetrische Ausführungsform der Lasche nach Figur 12 in einer perspektivischen Ansicht ihrer hinteren Flachseite und

Figur 14

die wechselsymmetrische Ausführungsform der Lasche in einer Querschnittsdarstellung.

Further details of advantageous embodiments of the invention will become apparent from the drawings, the description or claims. Show it:

FIG. 1

a heald with rod and dobby in a schematic front view,

FIG. 2

a tab of the linkage of Figure 1 in a perspective view,

FIG. 3

the tab of Figure 2 in a fragmentary plan view on a different scale,

FIGS. 4 and 5

modified embodiments of the connecting tab in each case in sections plan view,

FIG. 6

a further embodiment of a tab according to the invention in longitudinal section,

FIG. 7

a variant of the tab of Figure 6 in plan view,

FIG. 8

a further embodiment of the tab of Figure 6 in plan view,

FIG. 9

An embodiment of the tab according to the invention with a symmetrical longitudinal section,

FIG. 10

the tab of Figure 8, cut along the line XX,

FIG. 11

the tab of Figure 8, taken along the line XI-XI,

FIG. 12

a change-symmetrical embodiment of the tab in a perspective view of its front flat side,

FIG. 13

the alternating symmetrical embodiment of the tab of Figure 12 in a perspective view of its rear flat side and

FIG. 14

the alternating symmetrical embodiment of the tab in a cross-sectional view.

FIG. 1 illustrates a heddle 1 which is intended for Shedding on a weaving machine not further illustrated arranged and via a linkage 2 of a dobby 3 ago is driven. The dobby 3 is For example, an eccentric with an eccentric 4, via a connecting rod 5 serving as an output rocker. 6 driving back and forth. The rocker 6 is a Swiveling center 7 pivotally mounted. Your swinging motion is indicated in Figure 1 by an arrow 8.

That for transmitting the reciprocating pivotal movement the rocker 6 on the weaving shank 1 serving linkage 2 comprises at least two in the present embodiment pivotally mounted angle lever 9, 11, the train and Push rods 12, 13 are connected to the heald 1 to to move it up and down. The lower legs of the angle lever 9, 11 are interconnected by a connecting rod 14 connected, the articulated with the respective thighs the angle lever 9, 11 is connected. In the middle, the connecting rod 14 to be supported by a rocker 15, the hingedly connected to the connecting rod 14 at one end and stored with its other end to a pivot bearing is. The connection between the angle lever 9, the Dobby 3 is disposed adjacent, and the dobby 3 is provided by a tab 16, one of which End 17 hinged to a rider 18 is connected to the the rocker 6 sits. Her other end 19 is articulated with connected to the lower leg of the angle lever 9.

The tab 16 is illustrated separately in FIG. It is altogether as a vibration-damping element formed, wherein it is stiff in the axial direction. At her Ends 17, 19 is forked. Two flat, parallel mutually oriented legs 21, 22 and 23, 24th in each case limit a space between each other in pairs for receiving the rider 18 and the angle lever 9. A transverse bore 25, 26 serves each of the Recording a bearing pin.

The tab 16 is illustrated separately in FIG. From the end 17 extends an elongated tongue-like Extension 27 away, which, according to Figure 2, preferably one has rectangular outline. His thickness is also decreasing preferably from the end 17 in the flap longitudinal direction L from. The outer surface 28 of the extension 27 lies with the outer surface of the leg 22 in a plane. The inner surface is inclined to this level. The outer surface 28 is also located with the outer surface of the leg 24 substantially in one Level. The part described so far forms a first Part 16a of the tab 16. To this belongs a complementary trained part 16b, whose extension 31 is also in Laschenlängsrichtung L is wedge-shaped. His Outer surface 32 is in turn in a common plane with the outer surfaces of the legs 21, 23rd

Between two extensions 27, 31 is a preferably arranged at an acute angle to the tab longitudinal direction L. Groove 33 formed by an elongated flat element 34 is filled from an elastomeric material. The element 34 separates the extensions 27, 31 completely from each other, so that they do not touch each other directly. Between front ends of the extensions 27, 31 and the respective adjacent ends 17, 19 are each a gap 35, 36 is formed, the one touch even under vibration load in derogation.

The element 34 is preferably a high material internal damping or high internal friction. It fills the Fugue 33 is preferably complete over its entire width and length and gapless and is glued to the extensions 27, 31 or otherwise e.g. cohesively by vulcanization connected. It can, as illustrated, in parallel or be wedge-shaped.

The extensions 27, 31 form with the element 34 a Sandwich assembly 37, the one hand, the stiff transmission of driving movements from the end 17 to the end 19 is used and the other hand, shocks and vibrations not or only very imperfectly forwarded. Shock waves or other Vibrations are effectively damped, independently of whether their direction of vibration is longitudinal or transverse to the tab longitudinal direction L stands.

The extent described, from the weaving 1, the Linkage 2 and the dobby 3 existing arrangement works as follows:

In operation, the rocker 6 performs a reciprocating Movement in the context of them in their extreme situations each more or less briefly essentially remains. The Swiveling the rocker 6 from one extreme to another then takes place in each case in a short quick pivoting movement with a strong acceleration from the one dead center out and with a strong braking when entering in the other dead center. This movement is via the tab 16 on the angle lever 9 and via the connecting rod 14 passed the angle lever 11, whereby the weaving 1 is raised or lowered. On the hedge are healds held with longitudinal play during this abrupt positioning process abut on their Litzentragschienen and here initiate significant vibrations in the hive. Furthermore From the hedge itself emanate vibrations that, like the High-frequency vibrations of healds, in the linkage 2 reach. Further vibrations go from the dobby 3 out. This applies in general, but in particular then Vibrations are recorded when the dobby Clutches contains the latching on and off. The connecting strap 16 consumes such vibrations. Shock waves the e.g. be initiated at the end 17, run partly along the wedge-shaped extension 17 and become here dampened by the element 34. They also go through the elastomer and are damped. Because of the big one Difference in the sound velocities of rubber and steel At around 1:70, structure-borne noise is emitted at the rubber / steel interface largely reflected. This prevents the tab 16 in each of their embodiments, the sound propagation. In the embodiment of Figure 3 changes as a result of the tapering of the extensions 27, 31 to their end down the characteristic impedance along the line of shock waves the longitudinal direction. The damping of waves or vibrations is therefore particularly broadband. In particular, will avoided that at the free end of the extension 27 waves be reflected and run back again. The same applies to the extension 31.

Although the damping effect of the sandwich assembly 37 thus broadband and good, is in Laschenlängsrichtung L achieves high rigidity. Regarding the transmission the drive movement forms the sandwich structure 37 a stiff transmission element while for shocks and Vibrations represents a strongly attenuated waveguide.

While the tab 16 according to Figure 3 of two identical Parts 16a, 16b is composed, the tab 16 ' according to Figure 4 from different, but complementary to each other Divide 16'a, 16'b. The extension 27 of the part 16'a extends parallel to the median plane of the part in question and rejuvenates to its free Wedge-shaped towards the end. The extension 31 of the part 16'b is forked. His two legs 38, 39 have parallel to each other Outside surfaces 28, 32 on. The trapped in between Space tapers in a wedge shape and symmetrically to the midplane towards the end of 19. The extension 27 touches the Legs 38, 39 not. The remaining between the elements, here v-shaped, joint 33 has a constant Strength and is of the elastomeric element 34 completed. The element 34 constitutes a cohesive Connection between the leg 38, the extension 27 and the Leg 39, whereby in turn the sandwich arrangement 37 is formed.

In addition to the above description to the Figures 1 to 3 based on the same reference numerals directed.

Figure 5 illustrates a further modified embodiment the connecting strap as a connecting strap 16 ", which in turn is based on two consensus forms Divide 16 "a, 16" b, these are not here each other overlap. Rather, the wedge-shaped or extend parallel flanked extensions 27, 31 in the same Level towards each other, with the end faces of their ends together limit a gap 41. On both sides of the flat both extensions 27, 31 are for damping and vibration absorption serving plate-shaped elements 34, 42 and are connected to them flat, e.g. bonded. At her Outside are the elements 34, 42 with in the plate longitudinal direction L oriented rigid cover plates 43, 44 provided, the e.g. glued or vulcanized. The Elements 34, 42 may, like the cover plates 43, 44 a longitudinal direction have the same thickness. However, it is also possible, the cover plates 43, 44 double wedge-shaped form so that they are adjacent to the ends 17, 19 respectively their lowest and in the middle at the gap 41st each have their greatest thickness. Also this lug 16 " provides good vibration damping at high axial Stiffness. The parts 16a, 16b, 16'a, 16'b and 16 "a, 16" b Can be made of metal or a fiber reinforced rigid plastic be educated. This can, for example, in the area the legs 21, 22, 23, 24 provided with metal inserts be. The material of the element 34 is preferably a Material with low internal damping, for example, a Polyurethane or natural rubber. Such a flap 16, 16 ', 16 "can be used as a connecting element of a linkage to drive a heald 1 to a dobby 3 or otherwise Drive as well as a connecting element within serve the linkage.

Another modified and currently preferred embodiment The tab 16 according to the invention is shown in FIG. 6 illustrated. The full content of the explanation will be explained the description of the tab 16 referenced according to Figure 3, wherein the following differences apply:

The extensions 27, 31 extend as a flat plate-like Elements away from the ends 17, 19, being parallel are arranged to each other. Between the extensions 27, 31 is arranged here the thicker formed element 34, which consists of polyurethane or natural rubber, and the thickness of which substantially exceeds the thickness of the extensions 27, 31. To stiffen the extensions 27, 31 can their be bent longitudinal edges, with the edges the extensions 27, 31 preferably do not touch. The Free edges of these bent edges can be straight be. FIG. 7 illustrates a modified embodiment, in which these edges are not rectilinear are to crack the flaps emergency running properties or breakage of the element 34. Which is different from the Extension 27 approximately at right angles away extending edge 46 has a serrated edge 47 on. The from the extension 31st approximately at right angles to the edge 46 to extending edge 48th also has a serrated edge 49. The teeth of the Edges 46, 48 interlock without touching. she can be rectangular or, as shown, trapezoidal Pinnacles or prongs be formed whose distance from each other is so large that picked up by the element 34 vibrations do not lead to edge contact. Tears or breaks However, the element 34, the form-fitting into each other Crossing battlements 46, 48 a movement transmission and thus coupling of the parts 16a, 16b of the tab 16 which guarantees certain emergency running properties.

The gap between the edges 46, 48 can also, as in Figure 8 is illustrated, straight and in the acute angle to the longitudinal direction of the tab 16 according to FIG 6 be arranged. The edges 46, 48 close preferably seamlessly to the respective end 17, 19, whereby They contribute greatly to the stiffening of the tab 16. Figures 10 and 11 illustrate the arrangement of the element 34 in which of the extensions 27, 31 and their Edges 46, 48 surround the interior. Preferably closes the element 34 with the edges 46, 48 and also on the Each side of a gap, creating a largely homogeneous loading of the element 34 is achieved.

A further modified embodiment of the element 16 'illustrates Figure 9. This is largely based on the Embodiment of the tab 16 'according to FIG. 4 with the difference that that the extension 27 and the legs 38, 39 respectively not wedge-shaped but as thin-walled, parallel-flanked or parallel-surface components are formed. Otherwise Reference is made to the description of Figure 4. The edges the legs 38, 39 may be angled and similar Figure 10 or Figure 11. It is also possible, the edges of the Anvil 27 angled, making this a flat U-profile or receives a Z-profile. Regarding the border design can resort to the principles of Figure 7 or 8 are, i. the resulting joints can be straightforward, straight or diagonally arranged or as a jagged line be educated.

The presented tab can according to Figure 1 as a compound between the dobby 3 and the other linkage 2 serve. It is also possible, the connecting rod 14th form according to the structure of the tab 16. Likewise the pull and push rods 12, 13 elements such as the tabs 16 contain or be designed as such. It is next possible, the angle lever 9, 11 in the manner presented train. To the embodiment of Figure 7 remains Note that to secure the emergency running properties too One or more rivets may be provided, which are the tab 16 transversely and in a way floating are stored. For example, they can be fixed in the element 34 sit and the extensions 27, 31 at holes without edge contact succeed. Round heads can float over the Outside surfaces 28, 32 of the extensions 27, 31 may be arranged. By way of illustration, this is shown by a dashed line in FIG shown rivet 50 indicated.

FIG. 12 illustrates a tab 16 which has proved to be particularly suitable. The peculiarity this tab 16 is that extending from their ends 17, 19 extending away extensions 27, 31 respectively in Extensions 27a, 27b, 31a (see Figure 13), 31b divided are. The extensions 27a, 27b extend, in particular 14 can be seen at different Flat sides of the damping element 34 along, where they Do not overlap or overlap significantly. Like from the Cross-sectional view according to Figure 14 can be seen, are the Projections 27a, 27b about half as wide as the element 34th While the extension 27a arranged at the top left is, the extension 27b is arranged at the bottom right. Correspondingly, the extensions 31a, 31b, which differ from extending from the end 19, also about halfway wide as the damping element 34 is formed. During the Projection 31a in the left half of the bottom of the steaming Element 34 is arranged, the extension 31 b is on the right half of the top of the element 34 is arranged. The extent symmetrical arrangement is called alternating symmetrical Arrangement called. The tab according to the figures 12 to 14 can be rotated about its longitudinal axis by 180 °, wherein then from the point of view of the damping element again the same conditions be created.

The extensions 27a, 31b define one another between each other Slit 51. The extensions 31a, 27b define between each other a gap 52. This is like Figures 12 and 13 each illustrate, preferably a few millimeters wide and he can, as illustrated, formed meandering be. It is oriented in the longitudinal direction of the tab. He can alternatively straight (not meandering) formed. In addition, it can be at an acute angle to the longitudinal direction be arranged.

The extensions 27a to 31b are at their outer edges each angled and engage there in each other to the element 34 to live outside. The element 34 is with these angled edges preferably not connected. It consists in a preferred embodiment of an elastomer on natural rubber basis. It will be with the steel existing extensions 27a to 31b connected by vulcanization.

Also in all other illustrated embodiments For example, the cushioning member 34 may be made of natural rubber or a material based on natural rubber.

A novel linkage 2 for driving a hive 1 contains at least one tab 16, which is used for vibration damping an oriented in the longitudinal direction L of the lug 16 sandwich structure 37 has. Belongs to the sandwich structure at least one longitudinally extending rigid Element 27, which is connected to one end 17 of the tab 16 is also a substantially longitudinal direction extending second rigid member 31, with the other End 19 is connected and an interposed planar damping, also in the longitudinal direction extending element 34. The element 34 causes the mechanical Connection of the two parts 16a, 16b of the tab 16 exclusively. Preferably, there are no further connecting elements like rivets, screws or other stiff connections between the rigid elements 27, 31 is provided. Preferably, the rigid elements 27, 31 are opposite Formed wedges, thus in the longitudinal direction one set in opposite directions changing characteristic impedance. This causes a deliberate coupling-technical mismatch in terms of vibration transmission. That between them arranged element 34 dampens the vibrations in addition, so that the tab 16 drives like a filter transmits and destroys or absorbs spurious vibrations.

LIST OF REFERENCE NUMBERS

1

heald

2

linkage

3

dobby

4

eccentric

5

pleuel

6

wing

7

pivoting center

8th

arrow

9, 11

bell crank

12, 13

Pull and push rods

14

connecting rod

15

wing

16

flap

16a, 16b

parts

17

The End

18

equestrian

19

The End

21, 22, 23, 24

leg

25, 26

drilling

27, 27a, 27b

extension

28

outer surface

31, 31a, 31b

extension

32

outer surface

33

Gap

34

element

35, 36

gap

37

sandwich

38, 39

leg

41

gap

42

element

43, 44

cover

46, 48

edge

47, 49

edge

50

rivet

51, 52

gap

L

longitudinal direction

Claims (11)

Transmission (2) for transmitting a reciprocating drive movement of a dobby (3) to a heald (1),
which extends from an input (17) provided for connection to the dobby (3) to an output (12, 13) provided for connection to the heald (1) and which has at least one connecting lug (16) which has two ends (17, 19) ), in which a in the longitudinal direction Laschen (L) extending sandwich assembly (37) consisting of at least one planar extension (27, 31) of rigid material and at least one planar absorber element (34) is housed from vibration-absorbing material. Transmission according to claim 1, characterized in that the vibration-absorbing material is an elastomer. Transmission according to claim 1, characterized in that the rigid material is a fiber-reinforced plastic. Transmission according to claim 1, characterized in that the rigid material is a metal. A transmission according to claim 1, characterized in that associated with the sandwich assembly (37) is a first wall portion forming the extension (27) of rigid material connected to one of the ends (17), and
in that the sandwich arrangement (37) includes a second wall section forming a further extension (31) of rigid material, which is connected to the other of the ends (19), and
that (27, 31) the sheet-like absorbing member (34) is arranged between the two projections. Transmission according to claim 5, characterized in that the wall sections (27, 31) are formed in opposite directions wedge-shaped in the longitudinal direction. Transmission according to claim 5, characterized in that the absorber element (34) is a plate along the longitudinal direction of constant thickness. Transmission according to claim 5, characterized in that the absorber element (34) by an intermediate wall sections (27, 31) arranged elastomer layer is formed. A transmission according to claim 1, characterized in that the sandwich arrangement (37) extends from one end (17) to the other end (19) of the connecting link (16). Transmission according to claim 1, characterized in that the tab (16) forms the entrance of the linkage (2). Transmission according to claim 1, characterized in that the sandwich arrangement (37) is formed by two planar extensions (27a, 27b) from one end (17) and also two planar extensions (31a, 31b) from the other end (19). extend from rigid material, wherein the absorber element (34) of vibration-absorbing material in each case between two with different ends (17, 19) connected extensions (27a, 31a and 27b, 31b) is held.

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