EP2428601B1 - Guide needle assembly for a Jacquard guide bar - Google Patents

Description

A jacquard guide bar assembly comprising a carrier and a plurality of guide needle units individually removable from the carrier, each guide needle unit having at least one offset drive and a head, the carrier for each guide needle unit having a receptacle with a first portion and a second portion, and the head one end in the longitudinal direction of the guide needle unit seen a first Ausrichtfahne and at the other end a second Ausrichtfahne which are inserted into the sections receiving.

Such a guide needle assembly is made EP 2 192 218 A1 known. There, a guide needle assembly for a jacquard guide bar is shown with a carrier and a plurality of individually removable from the carrier needle assemblies. Each guide needle unit has at least one offset drive and a head (which is part of a mounting body). The carrier has a receptacle for each guide needle unit. The receptacle has a first section and a second section. The head has a first alignment flag at one end as viewed in the longitudinal direction of the guide needle unit and a second alignment flag at the other end. The upper registration flag continues from the lower registration flag. The carrier is provided between the two sections of the receptacle with a groove in which a locking element is arranged. This locking element is movable in the offset direction between a position in which a hook can pass through slots on an extension of the head, and a position in which the locking element engages behind the hook to prevent withdrawal of the guide needle unit from the guide needle assembly. The head has a thickness that corresponds to the needle pitch, so that the heads of adjacent needle units abut each other and form a smooth surface.

A jacquard guide bar is used in a warp knitting machine to increase the patterning possibilities there. The guide needles, which are arranged on the jacquard guide bar, are each individually controllable, so that they can be moved by their offset drive in the offset direction. The movement of the guide needle against the guide bar is then superimposed on the movement the guide bar itself, so that greater opportunities are given in the thread guide.

In many cases, the guide needles are grouped into segments or modules, these segments are then attached to the guide bar. Such a jacquard guide bar is for example made DE 196 13 385 C2 known. Here, the guide needles are attached to holding means that serve the individual control of the guide needles and are attached to segments. On the segments electrical controls are provided which control the movement of the guide needles.

If an error occurs in the use of such a guide needle arrangement, which manifests itself, for example, in a faulty patterning, then the guide needle assembly is removed altogether and replaced by a new guide needle arrangement. The defective needle assembly but can not be repaired practically, because the guide needles are firmly connected with their offset drives and the controls. Even if, for example, only a single offset drive has a defect, the other guide needles are no longer useful with their offset drives. In a disassembly namely the offset drives would be destroyed.

To work around this problem, you have therefore in CN 101 603 242 A proposed a guide needle assembly of the type mentioned. Here, each guide needle is provided with a needle holder. The needle holder points at its end facing away from the needle two pins on. These pins protrude beyond the needle holder. Thus, one end of the pins can be inserted into a carrier. On the other end of the pins, a holding plate is attached, so that the needle holder can be held in position. The pins simultaneously cause a distance between the support plate and the holding plate.

In such a guide needle assembly, it is indeed possible to replace individual guide needles. The assembly is relatively expensive. You have to align the pins very precisely, so you can put on the plate. If even a single pin or a single guide needle holder is something wrong, so that the pin does not hit the associated hole in the plate, the holding plate can not touch at all. Moreover, with such a formation of the guide needle assembly, it is difficult to achieve a high fineness.

A similar embodiment of a guide needle assembly is made EP 1 301 305 A1 known. Here, the guide needle units are arranged between two plates and engage there with projections in slots. Accordingly, the same problem arises when replacing a guide needle assembly.

The invention has for its object to enable easy assembly of the guide needle units on the carrier.

This object is achieved in a guide needle assembly of the type mentioned in that the alignment flags have different distances relative to a footprint of the head on the carrier.

With this configuration, it is relatively easy not only to position the individual guide needle units on the support, but also at the same time to align them so that they can perform their intended task. For this purpose, the head is held not only at two longitudinally spaced-apart positions. These two positions also have different distances to a footprint of the head on the carrier, so that the head can be secured in a simple manner against tilting of the guide needle unit relative to the carrier. If the alignment flags have been introduced into corresponding recesses on the carrier, the guide needle unit is mounted in a practically aligned manner and then only has to be determined in a suitable manner. The Ausrichtfahnen can be formed with a relatively small mass, because the forces acting on the guide needle units tilting moments are relatively small. Accordingly, the mass of the guide needle assembly can be kept relatively small overall, which has a favorable effect on the performance of the jacquard guide bar.

Preferably, the first alignment tab adjacent to the footprint faces toward a needle head and the second alignment tab further away from the footprint faces away from the needle head. The two alignment flags are diagonally on the head, so to speak arranged, wherein the inclination of the diagonal points to the needle head. This makes it possible to design the guide needle assembly in the direction of the needle head with a relatively low height. A larger height is required only in an area that is away from the needle head. This facilitates the guidance of the threads, which are to be guided by the guide needles, which are also included in the guide needle units. Thus the risk of disturbances in the enterprise is small.

Preferably, the receptacle has a first section for the first alignment tab and a second section for the second alignment tab, wherein the second section forms a continuation of the first section and both alignment tabs have the same thickness. So you can make the two sections of recording in one operation, for example, by a side milling cutter. This also ensures that the two sections of the recording have the desired orientation to each other. With the insertion of the guide needle unit, in which the two alignment flags are inserted into the two sections of the recording, then a reliable alignment of the guide needle unit is ensured.

Preferably, the first portion has a depth that is less than the height of the head. So the first section can be relatively flat. This has the consequence that also the carrier in this area can have a relatively small thickness. This in turn is from Advantage, because it allows you to keep the mass of the carrier small. The securing against the tilting of the guide needle unit also does not take place in the region of the first section of the receptacle, but only in the region of the second section of the receptacle. Here, the carrier can then have a greater height, but this is not critical, because this greater height may be limited to a smaller portion of the carrier.

It is preferred that the head protrudes with a projection on the offset drive in the direction of the carrier and the depth of the first portion is smaller than the supernatant. The Ausrichtfahne forms a part of the head. This makes it possible to arrange the offset drive with a sufficient distance from the carrier, so that the offset drive without obstruction by the carrier, the guide needle or the portion of the guide needle unit that carries the guide needle moves.

It is preferred that the alignment flags have a smaller thickness than the head. You can then put the head on both sides of the Ausrichtfahne that is inserted into the first section of the recording on the support, so that here is a defined footprint is given. This footprint also has a sufficient size so that the head can stand up with the necessary accuracy on the support.

Preferably, the head has a projection geometry pointing towards the needle head, which has an undercut geometry engages the carrier. If the projection geometry has come into engagement with the undercut geometry, then the head and thus the guide needle unit can no longer be lifted off the carrier. At this point, then the guide needle unit is positively held on the carrier.

The engagement geometry and the undercut geometry preferably have mutually adapted inclined surfaces. When the guide needle unit is shifted on the carrier in a direction facing the needle head, the head of the guide needle unit is pressed against the carrier. This achieves a very precise positioning.

Advantageously, the carrier on the side facing away from the needle head side of the head on an abutment and a removable clamping element is disposed between the abutment and the head. With the help of the clamping element, the head can then be braced relative to the abutment. In particular, in connection with the engagement geometry and the undercut geometry can be ensured by mounting or clamping the clamping element that the guide needle unit is permanently attached to the carrier, this attachment by disassembly or release of the clamping element is releasable again.

It is advantageous if the clamping element acts on a wedge surface on the head. This also turns the head on the side facing away from the needle head with a certain force pressed against the carrier.

Preferably, the clamping means is designed as an eccentric pin. An eccentric pin can act on several needle units simultaneously. It can be passed unhindered in a first rotational position between the abutment and the heads of the guide needle units. If it covers all provided needle units, it is simply rotated and then braces the needle assemblies against the abutment.

Preferably, the head has a hook into which a control board is inserted. The hook then ensures positioning of the control board relative to the head. In the head are then contacts, preferably spring contacts, provided which abut contact surfaces of the control board and accomplish a connection between the control board and the offset drive or the offset drives. The individual offset drives of the guide needles can then be controlled via the control board.

Fig. 1

eine perspektivische Darstellung einer Legenadelanordnung,

Fig. 2

eine Seitenansicht der Legenadelanordnung,

Fig. 3

eine perspektivische Ansicht eines Kopfes der Legenadelanordnung,

Fig. 4

eine perspektivische Ansicht des Kopfes aus einem anderen Blickwinkel,

Fig. 5

eine Steuerplatine mit Kontaktflächen, an denen Kontakte der Legenadeleinheiten anliegen,

Fig. 6

die Legenadelanordnung ohne Steuerplatine,

Fig. 7

eine Einzelheit C nach Fig. 6,

Fig. 8

eine Draufsicht auf einen Träger der Legenadelanordnung und

Fig. 9

einen Schnitt B-B nach Fig. 8.

The invention will be described below with reference to a preferred embodiment in conjunction with the drawings. Herein show:

Fig. 1

a perspective view of a guide needle assembly,

Fig. 2

a side view of the guide needle assembly,

Fig. 3

a perspective view of a head of the guide needle assembly,

Fig. 4

a perspective view of the head from a different angle,

Fig. 5

a control board with contact surfaces against which contacts of the guide needle units,

Fig. 6

the guide needle arrangement without control board,

Fig. 7

a detail C after Fig. 6 .

Fig. 8

a plan view of a support of the guide needle assembly and

Fig. 9

a section BB after Fig. 8 ,

Fig. 1 shows a guide needle assembly 1 with a plurality of guide needles 2. The guide needles 2 are attached to needle holders 3. Each guide needle holder is provided with at least one offset drive 4, wherein only the outer offset drive 4 of the outer needle holder 3 in Fig. 1 can be seen. In many cases, however, the guide needle holder 3 will be provided on its two flat sides with offset drives 4, so that a deflection of the guide needle 2 in the offset direction in both directions is possible. The offset direction is the direction in which the needle heads 5 of all guide needles 2 are arranged one behind the other. The movement of the guide needles 2 in the offset direction, which is controlled by the offset drives 4 is limited by stops 6.

The stops 6 are arranged on a carrier 7.

The guide needles 2 are part of a guide needle unit 8. Each guide needle unit has in addition to the guide needles 2, the guide needle holders 3 and the offset drives 4 and a head 9 at the end remote from the guide needles 2 of the guide needle unit 8. This head 9 is in the 3 and 4 shown in more detail.

The head 9 has a first alignment lug 10 and a second alignment lug 11. Both Ausrichtfahnen 10, 11 have seen in the offset direction has a smaller thickness than the head 9. The head has a footprint 12, with which it rests on the support 7 in the installed state. The first Ausrichtfahne 10 has a smaller distance to the footprint 12 than the second Ausrichtfahne 11. Relative to the head, the two Ausrichtfahnen 10, 11 arranged so to speak diagonally.

The carrier has a receptacle with a first section 13 and a second section 14 for each guide needle unit. In the first section 13, the first Ausrichtfahne 10 is used when the guide needle unit 8 is mounted on the carrier 7. In the second section 14, the second Ausrichtfahne 11 is used when the guide needle unit 8 is mounted on the carrier 7. As in particular from Fig. 8 it can be seen, are the two sections 13, 14 aligned exactly to one another, that is arranged on a straight line. The two Ausrichtfahnen 10, 11 have the same thickness. Thus, if the guide needle unit 8 is mounted on the support 7 such that the two alignment lugs 10, 11 are inserted into the two sections 13, 14 of the receptacle, then the guide needle unit is exactly aligned. The alignment of the two sections 13, 14 relative to each other can be achieved in a simple manner by making the two sections 13, 14 in one operation, for example by a side milling cutter.

The head 9 is thicker in the offset direction than the two Ausrichtfahnen 10, 11. Accordingly, it is possible to provide on the head 9 on both sides of the first Ausrichtfahne 10 to the needle head 5 facing outward projection geometry 15 with an inclined surface 16, with a corresponding undercut geometry 17 on the support with a corresponding inclined surface 18 engages when the guide needle unit 8 is mounted on the carrier 7. If then the guide needle unit 8 is moved in the direction of the needle head 5, then pull the two inclined surfaces 16, 18 the head 9 in the direction of the carrier 7, so that a very precise positioning of the head 9 and thus the guide needle unit 8 on the carrier. 7 receives.

The second portion 14 of the receptacle is arranged on a projection 19 of the carrier, which simultaneously forms an abutment 20 on which a eccentric pin 21st trained clamping device can be brought to bear in order to push the head 9 with its projection geometry 15 in the undercut geometry 17 on the carrier 7. The eccentric pin 21 has a flattened side 22. If this flattened side 22 faces the head 9, then the eccentric pin 21 can be passed between the abutment 20 and the head 9. By twisting the eccentric pin 21 is then a bracing of the head 9 relative to the abutment 20. This is again in Fig. 7 shown.

As in particular in Fig. 2 can be seen, is the head 9 on the offset drive 4 in the direction of the carrier 7 before. The first portion 13 of the receptacle has a depth which is smaller than the projection of the head 9 via the offset drive 4. Accordingly, it is possible in a simple manner to produce a sufficient distance between the offset drive 4 and the carrier 7, so that the offset drive 4 can move the guide needle holder 3 without being disturbed by the carrier 7.

At the head 9 a plurality of contacts 23-25 are provided. The contacts 23, 24 are working contacts for two offset drives 4 of a guide needle unit 8. The contact 25 is a ground contact. All contacts 23-25 are designed as spring contacts. The offset drives 4 are supplied with the required electrical power via these contacts 23-25 in order to activate the offset drives 4.

Furthermore, the head 9 has a window 26, through which the contacts 23-25 are accessible, so that they can be easily replaced if necessary.

The electrical activation of the offset drives 4 via a control board 27, which receives control commands via a line 28. Instead of a line 28, one can also use other signal transmission links.

The control board 27 has, on its side facing the carrier 7, three contact surfaces 29-31 for each guide needle unit, which contact the contacts 23-25 when the control board 27 is mounted. The control board 27 has controls 32 which are connected to the contact surfaces 29-31 and - if necessary - prepare signals which are supplied via the line 28.

The head 9 has a hook 33, into which the control board 27 can be used for mounting after the guide needle units are mounted on the carrier 7. The control board 27 can then be pivoted in the hook on the contacts 23-25 and then secured with a screw 34 on the carrier 7. The control board 27 then additionally serves as a holder for the leader needle units 8 on the carrier 7.

The head 9 has at its the abutment 20 facing the end of a wedge surface 35, which may also be rounded. In this wedge surface 35 of the eccentric pin 21 acts.

With such a guide needle assembly repair is relatively easy to perform. For this purpose, the guide needle assembly 1 is expediently first removed from the jacquard guide bar. After loosening the screw 34, the control board 27 can then be pivoted first and thus removed from the contacts 23-25. The removed control board 27 can then be tested for functionality.

Furthermore, you can rotate the eccentric pin 21 to release the clamping device. After removal of the eccentric pin 21, it is possible to displace each guide needle unit 8 along its longitudinal direction relative to the carrier 7, so that the projection geometry 15 is released from the undercut geometry 17 of the carrier 7. Thereafter, each guide needle unit 8 can be removed independently of other guide needle units 8 from the carrier 7. Each guide needle unit 8 can then be tested outside the carrier 7 by itself. If a guide needle unit 8 is defective, the other guide needle units 8 need not be replaced with the same, resulting in a cost-effective repair option.

The installation of the guide needle units 8 takes place in the reverse order. First, the guide needle unit 8 is attached to the carrier 7 in such a way that the first Ausrichtfahne 10 enters the first section 13 and the second Ausrichtfahne 11 in the second portion 14 of the recording. Thus, the guide needle unit 8 side, ie in the offset direction, already set and secured against tilting. The guide needle unit 8 is then displaced along its longitudinal direction, so that the projection geometry 15 engages with the undercut geometry 17. The footprint 12 is then firmly on the support 7, so that the guide needle unit 8 is precisely positioned in the height direction. Thereafter, the eccentric pin 21 is inserted and tensioned. Thus, all of the needle assemblies 8 are mechanically fixed to the carrier 7. Finally, the control board 27 is inserted into the hooks 33 and pivoted to the contacts 23-25 and fixed with the screw 34 on the carrier 7. Thus, all electrical contacts for supplying the offset drives 4 are made.

Claims (12)

1. Guide needle arrangement (1) for a Jacquard guide bar comprising a carrier (7) and a plurality of guide needle units (8) which can be individually removed from the carrier (7), each guide needle unit (8) comprising at least one offset drive (4) and a head (9), the carrier (7) comprising, for each guide needle unit (8), a receptacle having a first portion (13) and a second portion (14), and the head (9) comprising a first orientation lug (10) at one end when viewed in the longitudinal direction of the guide needle unit (8), and a second orientation lug (11) at the other end, which lugs are respectively inserted in the portions (13, 14) of the receptacle, characterised in that the orientation lugs (10, 11) are at different distances from a raised surface (12) of the head (9) on the carrier (7).
2. Guide needle arrangement according to claim 1, characterised in that the first orientation lug (10), which is adjacent to the raised surface (12), points towards a needle head (5) and the second orientation lug (11), which is further away from the raised surface (12), points away from the needle head (5).
3. Guide needle arrangement according to either claim 1 or claim 2, characterised in that the receptacle comprises a first portion (13) for the first orientation lug (10) and a second portion (14) for the second orientation lug (11), the second portion (14) forming a continuation of the first portion (13), both portions (13, 14) being arranged in a straight line and both orientation lugs (10, 11) being of the same thickness.
4. Guide needle arrangement according to claim 3, characterised in that the first portion (13) has a depth which is less than the height of the head (9).
5. Guide needle arrangement according to claim 4, characterised in that an overhang of the head (9) protrudes above the offset drive (4) in the direction of the carrier (7), and the depth of the first portion (13) is smaller than the overhang.
6. Guide needle arrangement according to any of claims 1 to 5, characterised in that the orientation lugs (10, 11) have a lower thickness than the head (9) in the offset direction.
7. Guide needle arrangement according to any of claims 1 to 6, characterised in that the head (9) has a projection geometry (15) which points towards the needle head (5) and engages in an undercut geometry (17) on the carrier (7).
8. Guide needle arrangement according to claim 7, characterised in that the engagement geometry (15) and the undercut geometry (17) comprise oblique surfaces (16, 18) which are adapted to one another.
9. Guide needle arrangement according to any of claims 1 to 8, characterised in that the carrier (7) comprises an abutment (20) on the side of the head (9) facing away from the needle head (5) and a removable tension element (21) is arranged between the abutment (20) and the head (9).
10. Guide needle arrangement according to claim 9, characterised in that the tension element (21) acts on a wedge surface (35) on the head (9).
11. Guide needle arrangement according to either claim 9 or claim 10, characterised in that the tension means (21) is configured as an eccentric pin.
12. Guide needle arrangement according to any of claims 1 to 11, characterised in that the head (9) comprises a hook (33) in which a circuit board (27) is inserted.

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