EP1006226B1 - Guide bars for a Jacquard machine - Google Patents

Description

The invention relates to a guide rod for jacquard weaving equipment according to the features of the preamble of the claim 1.

Such guide rods, also called selectors, used in jacquard weaving facilities side by side and on top of each other in large Pieces are used for example in G 9112552.9, EP 0494044 A1 and EP 0 188 074 A, which is the closest State of the art is considered have been described.

The Jaquard weaving facilities are specialized Device for weaving large patterned fabrics. The Operation of the Jaquard weaving facilities is based on the fact that each warp thread can be raised or lowered individually, whereby the variety of patterns of the object to be woven there are practically no limits.

With the now developed Jaquard weaving facilities become electronic modular devices with electromagnets used to control the lifting and lowering of the individual threads. So-called slats are attached to the guide rods or boards moved up and down by knife bars. To the Boards are attached to roller trains. At the free ends of the Rope pull cords are attached to harness cords. These harness cords in turn are coupled to the individual warp threads. If the roller train is raised, it will be on this Roller tension lifted warp thread lifted. To a warp thread to lift, a board must be held in its upper position become. To understand how the Jaquard weaving facilities work is based on the documents mentioned above explicitly referenced for the purpose of disclosure.

In the previously known Jaquard weaving facilities are on one computer-controlled PC disk a variety of such Guide rods with integrated magnet systems for tightening of the jacquard slats. In a specific embodiment are 22 such guide rods next to each other arranged. The boards themselves are also in a row arranged so that a jacquard weaving facility hundreds of has such guide rods.

The maximum packing density are due to the height of the guide rods Set limits. This is because in the guide rods each has a magnet system that is sufficient must be dimensioned large in order to be energized Coil arrangement of the magnet system for a safe magnetic Tighten the jacquard slats.

In the known guide rods of Jaquard weaving equipment provided the lamella itself is made of sheet metal should be magnetically attracted (see for example SK 277761 and Figures 4 and 5 in EP 0494044 A1) each two excitation coils arranged adjacent to one another are used, which are connected in series to each other. These two Excitation coils each sit on an iron core with a circular Cross-section. The magnet system is completed by Cover the end faces of the two excitation coils with pole plates. This is sufficient when the excitation coils are energized generates high magnetic force to attract the Jaquard slats and the holding force is also sufficient this well-known magnet system had to be high have a sufficient axial height. The number of turns of the both excitation coils was 1420, for example, and it had to be energized with a current of about 115 mA to a To generate a holding force of 0.42 N. The height of the magnet system, that is, the axial length of the excitation coils or Iron cores were about 13 mm. The maximum packing density the guide rods to each other were thus predetermined.

This is where the present invention comes in.

The invention has the aim of the known guide rods of To further develop Jaquard weaving facilities so that they are one require less installation space and therefore an increased packing density can be achieved.

This task is accomplished through a guide rods with the characteristics of claim 1 solved.

Further developments of the guide rod are the subject of the subclaims.

The guide rod according to the invention is essentially based on it, a cuboid elongated in cross section or at least approximately oval iron core as a carrier body to be provided for the excitation coil. At least this approximately oval or oblong, cuboid carrier body is a single excitation coil wound. The iron core and the excitation coil has an axial height that allows that the on the opposite outer surfaces of the iron core with their ceiling walls are at a distance of <13 mm from each other.

The new type of electromagnetic system integrated in the guide rods stands out in comparison to the previously known Electromagnetic systems with two excitation coils spaced apart from one another through an optimal field distribution of the energized Electromagnetic system. This is essentially because that by using only a single oval excitation coil the field lines run evenly around the coil. With the two excitation coils at a distance according to the state of the art it was the case that in The space between these two coils is the field line forces have canceled each other, so that in the middle of the there is almost no magnetic force in the two coils was.

In a development of the invention it is provided that the Iron core and the excitation coil wound on the iron core a total height of <10 mm, preferably 7 or 8 mm have, so that the ceiling walls of the two End faces of the iron core and the excitation coil The pole plates are also at a distance of <10 mm. Due to the lower overall height of the entire electromagnetic system ensures that compared to the previous known guide rods an increase in packing density of> 20% can be achieved.

In a development of the invention it is provided that the Iron core is formed in one piece. Such a one-piece Iron core, which has an oval or elongated cuboid shape, can be worked from the solid, for example. Another way to make one piece such an iron core consists in the sintering or in the novel MIM (Metal Injection Molding) technology.

However, it is also possible to design the iron core in several parts. This can happen, for example, in that two or more metal rod elements which are circular in cross section be lined up side by side. It can also be two Cuboids with one-sided rounding are lined up.

Those on the opposite faces of the iron core or the excitation coil arranged pole sheets are preferred U-shaped in cross-section. The pole sheets can by press, adhesive, riveted and / or welded connections be connected to the iron core. The pole plate is preferred a stamped and bent part.

In another embodiment of the invention, the pole plate made in one piece with the iron core. A manufacturing method this is the MIM technology already mentioned above.

The one-piece production of pole sheet and iron core can For example, take place in such a way that one of the pole plates together is made in one piece with the iron core and on a pole sheet in the free face of the iron core conventionally by punching, riveting, gluing or pressing is attached. Another variant is that in one piece on the two opposing pole plates a part of the iron core is formed and the both iron core parts then as free of air gaps as possible be joined together.

The pole plate thickness or pole plate thickness is approximately 1 mm.

Fig. 1

verschiedene perspektivische Ansichten einer ausschnittsweise gezeigten Führungsstange nach dem Stand der Technik zum Einsatz in Jaquard-Webeinrichtungen,

Fig. 2

ein Beispiel eines langgestreckten bzw. ovalen Eisenkerns mit aufgewickelter Spule in perspektivischer Darstellung für ein Magnetsystem bei einer Führungsstange nach der Erfindung,

Fig. 3

die Darstellung von Fig. 2 mit aufgesetztem Polblech,

Fig. 4

die Schnittdarstellung eines Magnetsystems mit zwei zueinander beabstandeten Erregerspulen und aufgesetzten Polblechen bei einem in einer Führungsstange eingesetzten Magnetsystem nach dem Stand der Technik,

Fig. 5

die Schnittdarstellung eines Magnetsystems für eine Führungsstange nach der Erfindung mit im Vergleich zum Magnetsystem in Fig. 4 deutlich reduzierter Bauhöhe, und

Fig. 6

beispielhaft die Kraft-Luftspalt-Kennlinien bei einem Magnetsystem nach dem Stand der Technik und einem Magnetsystem gemäß vorliegender Erfindung.

The guide rods according to the invention are explained in more detail below in connection with figures. Show it:

Fig. 1

different perspective views of a guide rod shown in detail according to the prior art for use in jacquard weaving equipment,

Fig. 2

1 shows an example of an elongated or oval iron core with a wound coil in a perspective view for a magnet system in a guide rod according to the invention,

Fig. 3

2 with the pole plate attached,

Fig. 4

1 shows the sectional view of a magnet system with two excitation coils spaced apart from one another and attached pole plates in a magnet system according to the prior art used in a guide rod,

Fig. 5

the sectional view of a magnet system for a guide rod according to the invention with a significantly reduced overall height compared to the magnet system in Fig. 4, and

Fig. 6

for example, the force-air gap characteristics in a magnet system according to the prior art and a magnet system according to the present invention.

Designate in the following figures, unless otherwise indicated, same reference numerals, same parts with the same Importance.

In Figure 1 is a guide rod in different views 10 with its upper part in perspective Representation shown. In the upper part of the Guide rod 10 is an electromagnetic system integrated. at The known guide rod 10 according to FIG. 1 has the electromagnet system two to the longitudinal axis of the guide rod 10 spaced-apart iron cores 12 which are circular Cross section. Around these two iron cores is 12 one excitation coil 14 each wound. The two excitation coils 14, each having approximately 1400 turns can be connected in series with each other and over Feed lines, not shown, can be connected to a power source. The iron cores 12 with excitation coils wound over them 14 sit in a cavity of the guide rod 10 and thus between the two ceiling walls 10a and 10d and the two opposite side walls 10b and 10c. On the both ends of the iron cores 12 and the excitation coils 14 one pole plate 18 sits on each. This pole plate 18 has via a ceiling wall 18a, which is riveted, welded, glued or Press connection with the upper end faces of the iron cores 12 is fixedly connected. The ceiling wall 18a closes approximately flush with the top wall 10a of the guide rod 10 from.

Extend U-shaped from this top wall 18a of the pole plate 18 there are two side walls 18b, 18c facing each other are spaced down away. These two side walls 18b and 18c of the pole plate 18 in turn close flush with the side walls 10b and 10c of the guide rods.

A second pole plate 18 is on the opposite end faces the iron cores 12 are also arranged, but only shown in dashed lines in Figure 1. It should be noted in this context that in Figure 1, the guide rods 10 each cut in sections along its plane of symmetry are shown. The entire guide rod 10 is in his upper part with the integrated electromagnetic system in one of the representations of Figure 1 indicated by dashed lines.

In a manner known per se lie on the two side walls 10b and 10c of the guide rod 10 jacquard slats or boards 16 on. These jacquard slats 16 are at non-energized electromagnetic system, that is, not from electricity flowed excitation coils 14, spaced with an air gap L. to the side walls 18b and 18c of the pole plates 18. If, on the other hand, current flows through the excitation coils 14, a magnetic field builds up through which the jacquard lamellas 16 to the side walls 18b and 18c of the pole plates 18 get dressed by.

By tightening the Jaquard slats 16 on the side walls 10b, 10c or 18b and 18c the openings in the jacquard slats slide 16 on retaining hooks, which are not shown in detail in FIG. 1 are shown.

The overall height of the known guide rods 10 is due to the axial extension of the iron cores 12 and the wound around them Excitation coils 14 together with attached pole plates 18. The overall height of the previously known guide rods 10 about 13 mm.

In Figures 2 and 3 is a perspective view an iron core system shown as in the guide rods 14th is used according to the invention. It is one now Iron core 12 is provided, which is elongated or oval in shape Cross section is formed. Around the circumferential surface of this elongated or oval-shaped iron core 12 is the excitation coil 14 wound, which consequently also has an oval contour. On the two end faces of the iron core 12 or the excitation coil 14 each has a pole plate 18, of which in FIG 3 only the upper pole plate 18 is shown.

Although the elongated or oval iron core 12 in one piece can be formed, it is within the scope of the invention To design iron core 12 in several parts, for example two parts. This is indicated in Figure 2 above. There are each in cross section circular iron bar parts next to each other lined up. In addition to such strung together iron core parts 12a, it is also possible for a large number of iron wires is packed together so that the one shown in FIG. elongated or oval cross-sectional shape of the iron core 12 comes. A preferred embodiment consists of juxtaposition of two cuboids with a rounded one End edge.

In Figure 5 is a side view of such an electromagnetic system shown. On the opposite faces the excitation coil 14 sit the ceiling walls of the two Pole plates 18a. The mutually facing side walls 18b of the pole plates 18 cover the peripheral surface of the excitation coil 14 partially. The distance between the ceiling walls 18a of the two pole plates 18 is less than 10 mm, for example 7 or 8 mm.

In comparison, FIG. 4 shows a side view of a conventional magnet system in a guide rod after the State of the art. The distance between the two Ceiling walls 18a of the pole plates 18 here Example 13 mm. The spaced apart are clearly shown Excitation coils 14 can be seen. A comparison of the two figures 4 and 5 shows that with a reduced overall height of the electromagnetic system whose length extension is approximately the same.

6 shows the force-air gap characteristics of the electromagnetic system with a guide rod 10 according to the state of the Technology (compare Figure 4) and the magnet system (compare Figure 5) a guide rod according to the invention graphically shown. It is assumed that the Air gap of the Jaquard lamella 16 to the side wall of the pole plates 18 when the excitation coils are not excited in both Cases is 0.25 mm. The excitation current is constant about 130 mA. It can be clearly seen that with one Air gap of 0.25 mm due to the electromagnetic system magnetic force generated by the invention significantly higher than that magnetic force generated by the known magnet system. While the magnetic force at 0.25 mm air gap in the new magnet system > 2 N, this is after in the magnet system the state of the art only 1.6 N. Using the curve it can be seen that this increased magnetic force up to an air gap of about 2 mm is maintained.

This increased magnetic force with the same air gap is through the more optimal field distribution with the magnet system after the Invention ensured.

LIST OF REFERENCE NUMBERS

10

guide rod

12

Coil core, iron core

14

excitation coil

16

lamella

18

pole plate

10a

ceiling wall

10b

Side wall

10c

Side wall

10d

ceiling wall

18a

ceiling wall

18b

Side wall

18c

Side wall

18d

ceiling wall

L

air gap

F

force

Claims (13)

1. A guide bar for a Jacquard power loom with an electromagnet system integrated inside the guide bar (10), which comprises a coil arrangement wound onto a support member and is covered by pole sheets (18),
   characterised in that the support member is an iron core (12) having an at least approximately oval peripheral face,
   in that an exciting coil (14) forming the coil arrangement is disposed around the peripheral face, and in that the pole sheets (18) each lie on the opposite outer faces of the iron core (12) with their cover walls and the cover walls (18a, 18d) of the pole sheets (18) have a mutual spacing of < 13 mm.
2. A guide bar according to Claim 1,
   characterised in that the spacing of the cover walls (18a, 18b) of the pole sheets (18) is < roughly 10 mm, in particular roughly 8 or 7 mm.
3. A guide bar according to Claim 1 or 2,
   characterised in that the iron core (12) has a single-piece construction.
4. A guide bar according to Claim 1 or 2,
   characterised in that the iron core (12) has a multi-piece construction, but at least a two-piece construction.
5. A guide bar according to Claim 4,
   characterised in that the multi-part iron core (12) has a plurality of lined-up iron parts (12a) each with a round cross section.
6. A guide bar according to one of Claims 1 to 5,
   characterised in that the pole sheets (18) are formed in a U-shape.
7. A guide bar according to Claim 6,
   characterised in that the pole sheets (18) are punched bent components.
8. A guide bar according to one of Claims 1 to 7,
   characterised in that the pole sheets (18) are fixed to the iron core (12) of the magnet system by compression, glued, rivetted and/or weld joints.
9. A guide bar according to one of Claims 1 to 4,
   characterised in that the pole sheets (18) are connected in one piece to the iron core (12).
10. A guide bar according to Claim 9,
    characterised in that in each case a pole sheet (18) is connected in one piece to one part of the iron core (12).
11. A guide bar according to Claim 9 or 10,
    characterised in that the pole sheets (18) with the iron core (12) or iron core part is produced in one piece by MIM (metal injection moulding) technology.
12. A guide bar according to one of Claims 1 to 11,
    characterised in that the pole sheets (18) have a thickness of ≤ roughly 1.0 mm.
13. A guide bar according to one of Claims 1 to 12,
    characterised in that the exciting coil (14) is a winding made of copper.

Images