EP3406772B1 - Heddle frame slat and heald frame - Google Patents

Description

Shaft rods for heald frames are known in many designs. Nowadays, hollow profile rods extruded from aluminum are often used as the base body for the shaft rod. Additional components such as a stranded support rail, guide elements, drive elements, components for connecting a side support and others are usually attached to these aluminum profiles. In the case of shaft rods for particularly fast-running weaving machines, stiffening rods, e.g. carbon fiber composite rods and damping strips made of plastic, are known as stops for the strands lined up with play.

The DE 102 06 130 B4 shows a damping band that is firmly clamped to an aluminum shaft rod or to an additional intermediate profile. There is no stiffening bar.

The DE 199 62 977 A1 shows damping tapes that are glued on, for example. No stiffening bar is shown in this document.

The EP 2 669 413 A1 shows a heald frame for high-speed looms which has both a stiffening rod and a damping band. The damping band is placed in or around the stiffening rod and held by it with little play by a kind of form fit. However, the in EP 2 669 413 A1 The stiffening rods and / or damping strips shown are very filigree and cannot be produced in a reproducible manner, or cannot be produced sufficiently, with the usual methods due to the small dimensions and narrow radii. In practice, these problems lead, among other things, to failure of the stiffening rod or the damping band. Due to the limited space, no way was found to fix the two partners with a form fit without at least one of the two being at risk of breakage.

The object of the present invention is to propose a shaft rod in which a stiffening rod and a damping band are integrated into the installation space present on the shaft rod and in which the stiffening rod and the damping band also have sufficient stability.

A shaft rod for high-speed looms has a base body and a stiffening rod. The shaft rod is characterized in that the base body, together with the stiffening rod, forms a receiving space in which a fastening element of a damping band can be held in a form fit as a stop for strands lined up with play. An appropriately adapted damping band can be added later or, if necessary, exchanged and replaced with a new one.

The object is also achieved by a shaft rod which has a base body, a stiffening rod and a damping band and in which the main body together with the stiffening rod forms a receiving space in which a fastening element of the damping band is accommodated. The existing installation space can be used to the best possible extent by means of a receiving space which is delimited together by the base body and the reinforcing rod. A stiffening rod in the sense of the present invention applies to bodies fixed on a base body, the primary task of which is to increase the flexural rigidity of the base body. The heddle support rail also often noticeably increases the flexural rigidity of the base body, although the main task of the heddle support rail is to hold the strands. For this reason, only very wear-resistant materials can be used for the stranded support rails; the stranded support rails are usually made of hardened steel. Fastening elements for the heddle support rail are also known from the prior art, which in turn can increase the flexural rigidity of the base body as a side effect. Such elements are also not a stiffening rod in the sense of this invention and are accordingly also formed from materials that differ from the material of the stiffening rod.

The base body is preferably a hollow profile rod extruded from aluminum or a light metal alloy, which includes various functions. For example, the heddle support rail can be attached to a chamberless extension of the base body. In the chamber there can be a Be housed connection to a side support. All elements that serve to fulfill such basic functionalities form the basic body - even in the case of a multi-part design. A base body which is set up for a shaft rod according to the invention provides the possibility of connecting a stiffening rod increasing its flexural rigidity and, with such a stiffening rod, forms a receiving space for a damping band.

In this respect, the stiffening rod is geometrically designed so that it can be easily attached to the base body in a way that is most advantageous for increasing the flexural strength of the base body and, for example, in the EP 2 669 413 A1 is described. In addition, the stiffening bar has geometric features with the aid of which a receiving space for a damping band is formed, for example a projection as explained in detail later. In addition to its main function of increasing the flexural rigidity of the shaft rod, the reinforcing rod also fulfills the function of forming, together with the base body, a receiving space for a damping band. In particular, the stiffening bar should preferably not serve to fasten the heddle support rail to the base body. The damping band is preferably an extruded plastic profile. In an advantageous embodiment, the base body, the stiffening body and preferably also the damping band run over the entire length of the shaft rod.

The construction space available for the heald frame is limited in the transverse direction by the pitch of the heald frames in the loom, generally to 12 mm per heald frame. The main body of the shaft rod therefore usually has a maximum extension of approximately 10 mm or less in this direction. Due to the mostly extruded hollow chamber profile of the base body, the directions on the base body and shaft rod are defined as follows: The direction in which the constant cross section of the hollow chamber profile produced by a press die extends is the longitudinal direction. At right angles to this, in the transverse direction, the profile is mostly limited to a maximum of approx. 10 mm and finally the vertical direction to both of the aforementioned is the height direction. The optimal use of the installation space creates a receiving space in which a fastening element of a damping band fits, which can be produced in a stable and reproducible manner. In addition, the stiffening profile can be made less filigree than in the prior art and is accordingly also sufficiently stable.

The fastening means is held in the receiving space by a form fit. This means that no additional elements are required to attach the damping profile to the shaft rod.

The fastening element is advantageously received in the receiving space with play. Thus, for example, the damping band can simply be drawn into the receiving space from the side in the longitudinal direction.

In an advantageous embodiment, the receiving space has an opening through which the fastening element of the damping band can engage in the receiving space. It is also preferred if a clear width of this opening is smaller than the clear width inside the receiving space, wherein according to the invention the slight width of the opening and the clear width of the receiving space are each delimited by the base body on the one hand and the stiffening rod on the other. An undercut can thus be formed for the fastening element. An undercut is generally a design feature that prevents separation from a second part by means of a protrusion or a widening on one part by the second part enclosing an open chamber or accessible space from which the protrusion or the widening of the first part cannot be destroyed without destruction or deformation can be taken out. The fastening element can then work together with the undercut and thus fix the damping band on the shaft rod. For this purpose, the fastening element can be angled while approximately maintaining its wall thickness. As a result of the angling, the fastening element widens compared to its simple wall thickness and cannot fall out of the receiving space because the fastening element is wider than the clear width of the opening of the receiving space due to this angled course. The undercut can be formed by the design of the stiffening rod or by the shape of the base body or by both. For example, a projection can be arranged on the base body through which the clear width of the opening in the Compared to the clear width of the recording room is reduced. For this purpose, such a projection will project at least partially in the transverse direction against the course of the base body in the height direction. Similarly, a projection running in this way can also or only be present on the stiffening rod.

The receiving space can have at least one delimiting surface which is arranged at an acute angle to the vertical direction and to the transverse direction of the base body. By means of such a boundary surface, the damping band can be given a preferred alignment with respect to the shaft rod, even if the fastening means is accommodated in the receiving space with play.

The boundary surface of the receiving space arranged on the base body can only run in the height direction. As a result, the base body can be designed to be as weight-saving as possible.

Fig. 1

Figur 1 zeigt ein Ausführungsbeispiel eines Schaftstabes in einer Schnittansicht parallel zur Längsrichtung.

Fig. 2

Figur 2 zeigt einen vergrößerten Ausschnitt aus Figur 1

Fig. 3

Figur 3 zeigt den Ausschnitt aus Figur 2, bei dem das Dämpfungsband in Höhenrichtung verschoben ist.

Fig. 4

Figur 4 zeigt ein weiteres Ausführungsbeispiel eines Schaftstabes in einer Ansicht wie Figur 1

The stiffening rod can be formed from material with higher flexural rigidity than aluminum or its alloys, preferably fiber material bound in a matrix, particularly preferably carbon fibers, is used. Any material which, with a preferably lower density, has a higher flexural rigidity than the base body and can be firmly connected to the base body, for example glued, can advantageously be used. In particular, the stiffening rod is not an intermediate profile that is only used to attach the damping but does not meet the aforementioned requirements for stiffening. With these requirements, the type of connection to the base body is also important. In the preferred exemplary embodiments, a large area, at least two-sided adhesive bond can be present in a chamber of the base body.

Fig. 1

Figure 1 shows an embodiment of a shaft rod in a sectional view parallel to the longitudinal direction.

Fig. 2

Figure 2 shows an enlarged section Figure 1

Fig. 3

Figure 3 shows the section Figure 2 , in which the damping band is shifted in the vertical direction.

Fig. 4

Figure 4 shows a further embodiment of a shaft rod in a view like Figure 1

Figure 1 shows an embodiment of a shaft rod 1 in a sectional view parallel to the longitudinal direction L. In this sectional view, no components that are insignificant for the invention, such as guide elements and the like, are shown. Only a heddle support rail is shown. Only one gluing gap is shown at the gluing points; further simplifications that do not work directly with the invention have been implemented. A stiffening rod 3 and a damping band 4 are attached to the base body 2 in the vicinity of the heddle support rail.

Figure 2 shows an enlarged section Figure 1 , in particular the stiffening rod 3 and the damping band 4 are clearly visible in this view. The stiffening rod 3 is encompassed by the base body 2 on parts of its extension from 3 sides. The stiffening rod 3 has a projection in the transverse direction at its lower end. The damping band 4 has a hollow body section and, proceeding therefrom, a fastening element 6 which is roughly in the form of the number “7”. As a result, the fastening element 6 expands in the transverse direction Q and is thus held in the receiving space 5 by a form fit. The projection of the stiffening rod 3 runs at an acute angle to the height direction H and to the transverse direction Q. The fastening element 6 of the damping band 4 rests on the corresponding inclined surface and on the boundary wall that is formed by the base body 2 and extends in the height direction H. It can be clearly seen that in this view there is still a free space in the receiving space 5 above the fastening element 6. The fastening element 6 is thus received in the receiving space 5 with play. It can also be clearly seen that the fastening element 6 is held in the receiving space 5 by a form fit and cannot fall out of the receiving space 5 in this illustration. Because of its curved shape, the fastening element 6 is wider than the clear width Wö of the opening 7 of the receiving space 5.

The opening 7 of the receiving space 5 and the clear width Wö of the opening 7 and the clear width Wa in the interior of the receiving space 5 can be seen better in FIG. For a better overview, the Figure 3 the cutout Figure 2 , in which the damping band 4 is shifted in the height direction H downwards. The clear width Wö of the opening 7 and the clear width Wa inside the Recording space 5 are indicated by arrows. It can be clearly seen that the arrow for the clear width Wa in the interior of the receiving space 5 is longer than the arrow for the clear width Wö of the opening 7. This creates an undercut through the projection of the stiffening rod and the base body, whereby the damping band 4 by means of its Fastening element 6 can be set.

Figure 4 shows a further embodiment of a shaft rod 1 in a view like Figure 1 . In contrast to the first exemplary embodiment, all of the boundary walls of the receiving space 5 run in the height direction H or transverse direction Q. The damping band again has a hollow body section, the fastening element runs at an angle of 90 °. The angled section of the fastening element 6 is held in the receiving space 5 by a form fit. List of reference symbols 1 Shaft rod 2 Base body 3 Stiffening bar 4th Cushioning tape 5 Recording room 6th Fasteners 7th opening H Height direction L. Longitudinal direction Q Transverse direction Wa clear width of the recording room Wö clear width of the opening

Claims (8)

1. Heald stave (1) for high-speed weaving machines, said heald stave (1) comprising a main body (2) and a reinforcement stave (3), characterized in that the main body (2) conjointly with the reinforcement stave (3) forms a receptacle space (5) in which a fastening means (6) of a damping strip (4) can be held in a form-fit as a detent for healds which are lined up with clearance.
2. Heald stave (1) according to Claim 1, characterized in that the heald stave comprises a damping strip (4), and the fastening element (6) is held by way of a form-fit in the receptacle space (5).
3. Heald stave (1) according to Claim 2, characterized in that the fastening element (6) is received with clearance in the receptacle space (5).
4. Heald stave (1) according to one of preceding Claims 2 to 3, characterized in that an available width (Wö) of an opening (7) of the receptacle space (5) is smaller than the available width (Wa) in the interior of the receptacle space (5), thus forming an undercut for the fastening element (6).
5. Heald stave (1) according to one of preceding Claims 2 to 4, characterized in that the fastening element (6), while approximately maintaining the wall thickness thereof, extends in an angular manner.
6. Heald stave (1) according to one of preceding Claims 2 to 5, characterized in that the receptacle space (5) comprises at least one delimitation face which is disposed at an acute angle in relation to a height direction (H) and a transverse direction (Q) of the main body (2).
7. Heald stave (1) according to one of preceding Claims 2 to 6, characterized in that the delimitation face of the receptacle space (5) that is disposed on the main body (2) extends only in the height direction (H).
8. Heald frame, comprising a heald stave according to one of the preceding claims.

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